// SPDX-License-Identifier: GPL-2.0-only
/*
* omap_hwmod implementation for OMAP2 / 3 / 4
*
* Copyright ( C ) 2009 - 2011 Nokia Corporation
* Copyright ( C ) 2011 - 2012 Texas Instruments , Inc .
*
* Paul Walmsley , Beno î t Cousson , Kevin Hilman
*
* Created in collaboration with ( alphabetical order ) : Thara Gopinath ,
* Tony Lindgren , Rajendra Nayak , Vikram Pandita , Sakari Poussa , Anand
* Sawant , Santosh Shilimkar , Richard Woodruff
*
* Introduction
* - - - - - - - - - - - -
* One way to view an OMAP SoC is as a collection of largely unrelated
* IP blocks connected by interconnects . The IP blocks include
* devices such as ARM processors , audio serial interfaces , UARTs ,
* etc . Some of these devices , like the DSP , are created by TI ;
* others , like the SGX , largely originate from external vendors . In
* TI ' s documentation , on - chip devices are referred to as " OMAP
* modules . " Some of these IP blocks are identical across several
* OMAP versions . Others are revised frequently .
*
* These OMAP modules are tied together by various interconnects .
* Most of the address and data flow between modules is via OCP - based
* interconnects such as the L3 and L4 buses ; but there are other
* interconnects that distribute the hardware clock tree , handle idle
* and reset signaling , supply power , and connect the modules to
* various pads or balls on the OMAP package .
*
* OMAP hwmod provides a consistent way to describe the on - chip
* hardware blocks and their integration into the rest of the chip .
* This description can be automatically generated from the TI
* hardware database . OMAP hwmod provides a standard , consistent API
* to reset , enable , idle , and disable these hardware blocks . And
* hwmod provides a way for other core code , such as the Linux device
* code or the OMAP power management and address space mapping code ,
* to query the hardware database .
*
* Using hwmod
* - - - - - - - - - - -
* Drivers won ' t call hwmod functions directly . That is done by the
* omap_device code , and in rare occasions , by custom integration code
* in arch / arm / * omap * . The omap_device code includes functions to
* build a struct platform_device using omap_hwmod data , and that is
* currently how hwmod data is communicated to drivers and to the
* Linux driver model . Most drivers will call omap_hwmod functions only
* indirectly , via pm_runtime * ( ) functions .
*
* From a layering perspective , here is where the OMAP hwmod code
* fits into the kernel software stack :
*
* + - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - +
* | Device driver code |
* | ( e . g . , drivers / ) |
* + - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - +
* | Linux driver model |
* | ( platform_device / |
* | platform_driver data / code ) |
* + - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - +
* | OMAP core - driver integration |
* | ( arch / arm / mach - omap2 / devices . c ) |
* + - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - +
* | omap_device code |
* | ( . . / plat - omap / omap_device . c ) |
* + - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - +
* - - - - > | omap_hwmod code / data | < - - - - -
* | ( . . / mach - omap2 / omap_hwmod * ) |
* + - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - +
* | OMAP clock / PRCM / register fns |
* | ( { read , write } l_relaxed , clk * ) |
* + - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - +
*
* Device drivers should not contain any OMAP - specific code or data in
* them . They should only contain code to operate the IP block that
* the driver is responsible for . This is because these IP blocks can
* also appear in other SoCs , either from TI ( such as DaVinci ) or from
* other manufacturers ; and drivers should be reusable across other
* platforms .
*
* The OMAP hwmod code also will attempt to reset and idle all on - chip
* devices upon boot . The goal here is for the kernel to be
* completely self - reliant and independent from bootloaders . This is
* to ensure a repeatable configuration , both to ensure consistent
* runtime behavior , and to make it easier for others to reproduce
* bugs .
*
* OMAP module activity states
* - - - - - - - - - - - - - - - - - - - - - - - - - - -
* The hwmod code considers modules to be in one of several activity
* states . IP blocks start out in an UNKNOWN state , then once they
* are registered via the hwmod code , proceed to the REGISTERED state .
* Once their clock names are resolved to clock pointers , the module
* enters the CLKS_INITED state ; and finally , once the module has been
* reset and the integration registers programmed , the INITIALIZED state
* is entered . The hwmod code will then place the module into either
* the IDLE state to save power , or in the case of a critical system
* module , the ENABLED state .
*
* OMAP core integration code can then call omap_hwmod * ( ) functions
* directly to move the module between the IDLE , ENABLED , and DISABLED
* states , as needed . This is done during both the PM idle loop , and
* in the OMAP core integration code ' s implementation of the PM runtime
* functions .
*
* References
* - - - - - - - - - -
* This is a partial list .
* - OMAP2420 Multimedia Processor Silicon Revision 2 . 1 . 1 , 2 . 2 ( SWPU064 )
* - OMAP2430 Multimedia Device POP Silicon Revision 2 . 1 ( SWPU090 )
* - OMAP34xx Multimedia Device Silicon Revision 3 . 1 ( SWPU108 )
* - OMAP4430 Multimedia Device Silicon Revision 1 . 0 ( SWPU140 )
* - Open Core Protocol Specification 2 . 2
*
* To do :
* - handle IO mapping
* - bus throughput & module latency measurement code
*
* XXX add tests at the beginning of each function to ensure the hwmod is
* in the appropriate state
* XXX error return values should be checked to ensure that they are
* appropriate
*/
#undef DEBUG
#include <linux/kernel.h>
#include <linux/errno.h>
#include <linux/io.h>
#include <linux/clk.h>
#include <linux/clk-provider.h>
#include <linux/delay.h>
#include <linux/err.h>
#include <linux/list.h>
#include <linux/mutex.h>
#include <linux/spinlock.h>
#include <linux/slab.h>
#include <linux/cpu.h>
#include <linux/of.h>
#include <linux/of_address.h>
#include <linux/memblock.h>
#include <linux/platform_data/ti-sysc.h>
#include <dt-bindings/bus/ti-sysc.h>
#include <asm /system_misc.h>
#include "clock.h"
#include "omap_hwmod.h"
#include "soc.h"
#include "common.h"
#include "clockdomain.h"
#include "hdq1w.h"
#include "mmc.h"
#include "powerdomain.h"
#include "cm2xxx.h"
#include "cm3xxx.h"
#include "cm33xx.h"
#include "prm.h"
#include "prm3xxx.h"
#include "prm44xx.h"
#include "prm33xx.h"
#include "prminst44xx.h"
#include "pm.h"
#include "wd_timer.h"
/* Name of the OMAP hwmod for the MPU */
#define MPU_INITIATOR_NAME "mpu"
/*
* Number of struct omap_hwmod_link records per struct
* omap_hwmod_ocp_if record ( master - > slave and slave - > master )
*/
#define LINKS_PER_OCP_IF 2
/*
* Address offset ( in bytes ) between the reset control and the reset
* status registers : 4 bytes on OMAP4
*/
#define OMAP4_RST_CTRL_ST_OFFSET 4
/*
* Maximum length for module clock handle names
*/
#define MOD_CLK_MAX_NAME_LEN 32
/**
* struct clkctrl_provider - clkctrl provider mapping data
* @ num_addrs : number of base address ranges for the provider
* @ addr : base address ( es ) for the provider
* @ size : size ( s ) of the provider address space ( s )
* @ node : device node associated with the provider
* @ link : list link
*/
struct clkctrl_provider {
int num_addrs;
u32 *addr;
u32 *size;
struct device_node *node;
struct list_head link;
};
static LIST_HEAD(clkctrl_providers);
/**
* struct omap_hwmod_reset - IP specific reset functions
* @ match : string to match against the module name
* @ len : number of characters to match
* @ reset : IP specific reset function
*
* Used only in cases where struct omap_hwmod is dynamically allocated .
*/
struct omap_hwmod_reset {
const char *match;
int len;
int (*reset)(struct omap_hwmod *oh);
};
/**
* struct omap_hwmod_soc_ops - fn ptrs for some SoC - specific operations
* @ enable_module : function to enable a module ( via MODULEMODE )
* @ disable_module : function to disable a module ( via MODULEMODE )
*
* XXX Eventually this functionality will be hidden inside the PRM / CM
* device drivers . Until then , this should avoid huge blocks of cpu_is_ * ( )
* conditionals in this code .
*/
struct omap_hwmod_soc_ops {
void (*enable_module)(struct omap_hwmod *oh);
int (*disable_module)(struct omap_hwmod *oh);
int (*wait_target_ready)(struct omap_hwmod *oh);
int (*assert_hardreset)(struct omap_hwmod *oh,
struct omap_hwmod_rst_info *ohri);
int (*deassert_hardreset)(struct omap_hwmod *oh,
struct omap_hwmod_rst_info *ohri);
int (*is_hardreset_asserted)(struct omap_hwmod *oh,
struct omap_hwmod_rst_info *ohri);
int (*init_clkdm)(struct omap_hwmod *oh);
void (*update_context_lost)(struct omap_hwmod *oh);
int (*get_context_lost)(struct omap_hwmod *oh);
int (*disable_direct_prcm)(struct omap_hwmod *oh);
u32 (*xlate_clkctrl)(struct omap_hwmod *oh);
};
/* soc_ops: adapts the omap_hwmod code to the currently-booted SoC */
static struct omap_hwmod_soc_ops soc_ops;
/* omap_hwmod_list contains all registered struct omap_hwmods */
static LIST_HEAD(omap_hwmod_list);
static DEFINE_MUTEX(list_lock);
/* mpu_oh: used to add/remove MPU initiator from sleepdep list */
static struct omap_hwmod *mpu_oh;
/* inited: set to true once the hwmod code is initialized */
static bool inited;
/* Private functions */
/**
* _ update_sysc_cache - return the module OCP_SYSCONFIG register , keep copy
* @ oh : struct omap_hwmod *
*
* Load the current value of the hwmod OCP_SYSCONFIG register into the
* struct omap_hwmod for later use . Returns - EINVAL if the hwmod has no
* OCP_SYSCONFIG register or 0 upon success .
*/
static int _update_sysc_cache(struct omap_hwmod *oh)
{
if (!oh->class ->sysc) {
WARN(1 , "omap_hwmod: %s: cannot read OCP_SYSCONFIG: not defined on hwmod's class\n" , oh->name);
return -EINVAL;
}
/* XXX ensure module interface clock is up */
oh->_sysc_cache = omap_hwmod_read(oh, oh->class ->sysc->sysc_offs);
if (!(oh->class ->sysc->sysc_flags & SYSC_NO_CACHE))
oh->_int_flags |= _HWMOD_SYSCONFIG_LOADED;
return 0 ;
}
/**
* _ write_sysconfig - write a value to the module ' s OCP_SYSCONFIG register
* @ v : OCP_SYSCONFIG value to write
* @ oh : struct omap_hwmod *
*
* Write @ v into the module class ' OCP_SYSCONFIG register , if it has
* one . No return value .
*/
static void _write_sysconfig(u32 v, struct omap_hwmod *oh)
{
if (!oh->class ->sysc) {
WARN(1 , "omap_hwmod: %s: cannot write OCP_SYSCONFIG: not defined on hwmod's class\n" , oh->name);
return ;
}
/* XXX ensure module interface clock is up */
/* Module might have lost context, always update cache and register */
oh->_sysc_cache = v;
/*
* Some IP blocks ( such as RTC ) require unlocking of IP before
* accessing its registers . If a function pointer is present
* to unlock , then call it before accessing sysconfig and
* call lock after writing sysconfig .
*/
if (oh->class ->unlock)
oh->class ->unlock(oh);
omap_hwmod_write(v, oh, oh->class ->sysc->sysc_offs);
if (oh->class ->lock)
oh->class ->lock(oh);
}
/**
* _ set_master_standbymode : set the OCP_SYSCONFIG MIDLEMODE field in @ v
* @ oh : struct omap_hwmod *
* @ standbymode : MIDLEMODE field bits
* @ v : pointer to register contents to modify
*
* Update the master standby mode bits in @ v to be @ standbymode for
* the @ oh hwmod . Does not write to the hardware . Returns - EINVAL
* upon error or 0 upon success .
*/
static int _set_master_standbymode(struct omap_hwmod *oh, u8 standbymode,
u32 *v)
{
u32 mstandby_mask;
u8 mstandby_shift;
if (!oh->class ->sysc ||
!(oh->class ->sysc->sysc_flags & SYSC_HAS_MIDLEMODE))
return -EINVAL;
if (!oh->class ->sysc->sysc_fields) {
WARN(1 , "omap_hwmod: %s: offset struct for sysconfig not provided in class\n" , oh->name);
return -EINVAL;
}
mstandby_shift = oh->class ->sysc->sysc_fields->midle_shift;
mstandby_mask = (0 x3 << mstandby_shift);
*v &= ~mstandby_mask;
*v |= __ffs(standbymode) << mstandby_shift;
return 0 ;
}
/**
* _ set_slave_idlemode : set the OCP_SYSCONFIG SIDLEMODE field in @ v
* @ oh : struct omap_hwmod *
* @ idlemode : SIDLEMODE field bits
* @ v : pointer to register contents to modify
*
* Update the slave idle mode bits in @ v to be @ idlemode for the @ oh
* hwmod . Does not write to the hardware . Returns - EINVAL upon error
* or 0 upon success .
*/
static int _set_slave_idlemode(struct omap_hwmod *oh, u8 idlemode, u32 *v)
{
u32 sidle_mask;
u8 sidle_shift;
if (!oh->class ->sysc ||
!(oh->class ->sysc->sysc_flags & SYSC_HAS_SIDLEMODE))
return -EINVAL;
if (!oh->class ->sysc->sysc_fields) {
WARN(1 , "omap_hwmod: %s: offset struct for sysconfig not provided in class\n" , oh->name);
return -EINVAL;
}
sidle_shift = oh->class ->sysc->sysc_fields->sidle_shift;
sidle_mask = (0 x3 << sidle_shift);
*v &= ~sidle_mask;
*v |= __ffs(idlemode) << sidle_shift;
return 0 ;
}
/**
* _ set_clockactivity : set OCP_SYSCONFIG . CLOCKACTIVITY bits in @ v
* @ oh : struct omap_hwmod *
* @ clockact : CLOCKACTIVITY field bits
* @ v : pointer to register contents to modify
*
* Update the clockactivity mode bits in @ v to be @ clockact for the
* @ oh hwmod . Used for additional powersaving on some modules . Does
* not write to the hardware . Returns - EINVAL upon error or 0 upon
* success .
*/
static int _set_clockactivity(struct omap_hwmod *oh, u8 clockact, u32 *v)
{
u32 clkact_mask;
u8 clkact_shift;
if (!oh->class ->sysc ||
!(oh->class ->sysc->sysc_flags & SYSC_HAS_CLOCKACTIVITY))
return -EINVAL;
if (!oh->class ->sysc->sysc_fields) {
WARN(1 , "omap_hwmod: %s: offset struct for sysconfig not provided in class\n" , oh->name);
return -EINVAL;
}
clkact_shift = oh->class ->sysc->sysc_fields->clkact_shift;
clkact_mask = (0 x3 << clkact_shift);
*v &= ~clkact_mask;
*v |= clockact << clkact_shift;
return 0 ;
}
/**
* _ set_softreset : set OCP_SYSCONFIG . SOFTRESET bit in @ v
* @ oh : struct omap_hwmod *
* @ v : pointer to register contents to modify
*
* Set the SOFTRESET bit in @ v for hwmod @ oh . Returns - EINVAL upon
* error or 0 upon success .
*/
static int _set_softreset(struct omap_hwmod *oh, u32 *v)
{
u32 softrst_mask;
if (!oh->class ->sysc ||
!(oh->class ->sysc->sysc_flags & SYSC_HAS_SOFTRESET))
return -EINVAL;
if (!oh->class ->sysc->sysc_fields) {
WARN(1 , "omap_hwmod: %s: offset struct for sysconfig not provided in class\n" , oh->name);
return -EINVAL;
}
softrst_mask = (0 x1 << oh->class ->sysc->sysc_fields->srst_shift);
*v |= softrst_mask;
return 0 ;
}
/**
* _ clear_softreset : clear OCP_SYSCONFIG . SOFTRESET bit in @ v
* @ oh : struct omap_hwmod *
* @ v : pointer to register contents to modify
*
* Clear the SOFTRESET bit in @ v for hwmod @ oh . Returns - EINVAL upon
* error or 0 upon success .
*/
static int _clear_softreset(struct omap_hwmod *oh, u32 *v)
{
u32 softrst_mask;
if (!oh->class ->sysc ||
!(oh->class ->sysc->sysc_flags & SYSC_HAS_SOFTRESET))
return -EINVAL;
if (!oh->class ->sysc->sysc_fields) {
WARN(1 ,
"omap_hwmod: %s: sysc_fields absent for sysconfig class\n" ,
oh->name);
return -EINVAL;
}
softrst_mask = (0 x1 << oh->class ->sysc->sysc_fields->srst_shift);
*v &= ~softrst_mask;
return 0 ;
}
/**
* _ wait_softreset_complete - wait for an OCP softreset to complete
* @ oh : struct omap_hwmod * to wait on
*
* Wait until the IP block represented by @ oh reports that its OCP
* softreset is complete . This can be triggered by software ( see
* _ ocp_softreset ( ) ) or by hardware upon returning from off - mode ( one
* example is HSMMC ) . Waits for up to MAX_MODULE_SOFTRESET_WAIT
* microseconds . Returns the number of microseconds waited .
*/
static int _wait_softreset_complete(struct omap_hwmod *oh)
{
struct omap_hwmod_class_sysconfig *sysc;
u32 softrst_mask;
int c = 0 ;
sysc = oh->class ->sysc;
if (sysc->sysc_flags & SYSS_HAS_RESET_STATUS && sysc->syss_offs > 0 )
omap_test_timeout((omap_hwmod_read(oh, sysc->syss_offs)
& SYSS_RESETDONE_MASK),
MAX_MODULE_SOFTRESET_WAIT, c);
else if (sysc->sysc_flags & SYSC_HAS_RESET_STATUS) {
softrst_mask = (0 x1 << sysc->sysc_fields->srst_shift);
omap_test_timeout(!(omap_hwmod_read(oh, sysc->sysc_offs)
& softrst_mask),
MAX_MODULE_SOFTRESET_WAIT, c);
}
return c;
}
/**
* _ set_dmadisable : set OCP_SYSCONFIG . DMADISABLE bit in @ v
* @ oh : struct omap_hwmod *
*
* The DMADISABLE bit is a semi - automatic bit present in sysconfig register
* of some modules . When the DMA must perform read / write accesses , the
* DMADISABLE bit is cleared by the hardware . But when the DMA must stop
* for power management , software must set the DMADISABLE bit back to 1 .
*
* Set the DMADISABLE bit in @ v for hwmod @ oh . Returns - EINVAL upon
* error or 0 upon success .
*/
static int _set_dmadisable(struct omap_hwmod *oh)
{
u32 v;
u32 dmadisable_mask;
if (!oh->class ->sysc ||
!(oh->class ->sysc->sysc_flags & SYSC_HAS_DMADISABLE))
return -EINVAL;
if (!oh->class ->sysc->sysc_fields) {
WARN(1 , "omap_hwmod: %s: offset struct for sysconfig not provided in class\n" , oh->name);
return -EINVAL;
}
/* clocks must be on for this operation */
if (oh->_state != _HWMOD_STATE_ENABLED) {
pr_warn("omap_hwmod: %s: dma can be disabled only from enabled state\n" , oh->name);
return -EINVAL;
}
pr_debug("omap_hwmod: %s: setting DMADISABLE\n" , oh->name);
v = oh->_sysc_cache;
dmadisable_mask =
(0 x1 << oh->class ->sysc->sysc_fields->dmadisable_shift);
v |= dmadisable_mask;
_write_sysconfig(v, oh);
return 0 ;
}
/**
* _ set_module_autoidle : set the OCP_SYSCONFIG AUTOIDLE field in @ v
* @ oh : struct omap_hwmod *
* @ autoidle : desired AUTOIDLE bitfield value ( 0 or 1 )
* @ v : pointer to register contents to modify
*
* Update the module autoidle bit in @ v to be @ autoidle for the @ oh
* hwmod . The autoidle bit controls whether the module can gate
* internal clocks automatically when it isn ' t doing anything ; the
* exact function of this bit varies on a per - module basis . This
* function does not write to the hardware . Returns - EINVAL upon
* error or 0 upon success .
*/
static int _set_module_autoidle(struct omap_hwmod *oh, u8 autoidle,
u32 *v)
{
u32 autoidle_mask;
u8 autoidle_shift;
if (!oh->class ->sysc ||
!(oh->class ->sysc->sysc_flags & SYSC_HAS_AUTOIDLE))
return -EINVAL;
if (!oh->class ->sysc->sysc_fields) {
WARN(1 , "omap_hwmod: %s: offset struct for sysconfig not provided in class\n" , oh->name);
return -EINVAL;
}
autoidle_shift = oh->class ->sysc->sysc_fields->autoidle_shift;
autoidle_mask = (0 x1 << autoidle_shift);
*v &= ~autoidle_mask;
*v |= autoidle << autoidle_shift;
return 0 ;
}
/**
* _ enable_wakeup : set OCP_SYSCONFIG . ENAWAKEUP bit in the hardware
* @ oh : struct omap_hwmod *
*
* Allow the hardware module @ oh to send wakeups . Returns - EINVAL
* upon error or 0 upon success .
*/
static int _enable_wakeup(struct omap_hwmod *oh, u32 *v)
{
if (!oh->class ->sysc ||
!((oh->class ->sysc->sysc_flags & SYSC_HAS_ENAWAKEUP) ||
(oh->class ->sysc->idlemodes & SIDLE_SMART_WKUP) ||
(oh->class ->sysc->idlemodes & MSTANDBY_SMART_WKUP)))
return -EINVAL;
if (!oh->class ->sysc->sysc_fields) {
WARN(1 , "omap_hwmod: %s: offset struct for sysconfig not provided in class\n" , oh->name);
return -EINVAL;
}
if (oh->class ->sysc->sysc_flags & SYSC_HAS_ENAWAKEUP)
*v |= 0 x1 << oh->class ->sysc->sysc_fields->enwkup_shift;
if (oh->class ->sysc->idlemodes & SIDLE_SMART_WKUP)
_set_slave_idlemode(oh, HWMOD_IDLEMODE_SMART_WKUP, v);
if (oh->class ->sysc->idlemodes & MSTANDBY_SMART_WKUP)
_set_master_standbymode(oh, HWMOD_IDLEMODE_SMART_WKUP, v);
/* XXX test pwrdm_get_wken for this hwmod's subsystem */
return 0 ;
}
static struct clockdomain *_get_clkdm(struct omap_hwmod *oh)
{
struct clk_hw_omap *clk;
if (!oh)
return NULL;
if (oh->clkdm) {
return oh->clkdm;
} else if (oh->_clk) {
if (!omap2_clk_is_hw_omap(__clk_get_hw(oh->_clk)))
return NULL;
clk = to_clk_hw_omap(__clk_get_hw(oh->_clk));
return clk->clkdm;
}
return NULL;
}
/**
* _ add_initiator_dep : prevent @ oh from smart - idling while @ init_oh is active
* @ oh : struct omap_hwmod *
*
* Prevent the hardware module @ oh from entering idle while the
* hardare module initiator @ init_oh is active . Useful when a module
* will be accessed by a particular initiator ( e . g . , if a module will
* be accessed by the IVA , there should be a sleepdep between the IVA
* initiator and the module ) . Only applies to modules in smart - idle
* mode . If the clockdomain is marked as not needing autodeps , return
* 0 without doing anything . Otherwise , returns - EINVAL upon error or
* passes along clkdm_add_sleepdep ( ) value upon success .
*/
static int _add_initiator_dep(struct omap_hwmod *oh, struct omap_hwmod *init_oh)
{
struct clockdomain *clkdm, *init_clkdm;
clkdm = _get_clkdm(oh);
init_clkdm = _get_clkdm(init_oh);
if (!clkdm || !init_clkdm)
return -EINVAL;
if (clkdm && clkdm->flags & CLKDM_NO_AUTODEPS)
return 0 ;
return clkdm_add_sleepdep(clkdm, init_clkdm);
}
/**
* _ del_initiator_dep : allow @ oh to smart - idle even if @ init_oh is active
* @ oh : struct omap_hwmod *
*
* Allow the hardware module @ oh to enter idle while the hardare
* module initiator @ init_oh is active . Useful when a module will not
* be accessed by a particular initiator ( e . g . , if a module will not
* be accessed by the IVA , there should be no sleepdep between the IVA
* initiator and the module ) . Only applies to modules in smart - idle
* mode . If the clockdomain is marked as not needing autodeps , return
* 0 without doing anything . Returns - EINVAL upon error or passes
* along clkdm_del_sleepdep ( ) value upon success .
*/
static int _del_initiator_dep(struct omap_hwmod *oh, struct omap_hwmod *init_oh)
{
struct clockdomain *clkdm, *init_clkdm;
clkdm = _get_clkdm(oh);
init_clkdm = _get_clkdm(init_oh);
if (!clkdm || !init_clkdm)
return -EINVAL;
if (clkdm && clkdm->flags & CLKDM_NO_AUTODEPS)
return 0 ;
return clkdm_del_sleepdep(clkdm, init_clkdm);
}
static const struct of_device_id ti_clkctrl_match_table[] __initconst = {
{ .compatible = "ti,clkctrl" },
{ }
};
static int __init _setup_clkctrl_provider(struct device_node *np)
{
struct clkctrl_provider *provider;
int i;
provider = memblock_alloc(sizeof (*provider), SMP_CACHE_BYTES);
if (!provider)
return -ENOMEM;
provider->node = np;
provider->num_addrs = of_address_count(np);
provider->addr =
memblock_alloc(sizeof (void *) * provider->num_addrs,
SMP_CACHE_BYTES);
if (!provider->addr)
return -ENOMEM;
provider->size =
memblock_alloc(sizeof (u32) * provider->num_addrs,
SMP_CACHE_BYTES);
if (!provider->size)
return -ENOMEM;
for (i = 0 ; i < provider->num_addrs; i++) {
struct resource res;
of_address_to_resource(np, i, &res);
provider->addr[i] = res.start;
provider->size[i] = resource_size(&res);
pr_debug("%s: %pOF: %pR\n" , __func__, np, &res);
}
list_add(&provider->link, &clkctrl_providers);
return 0 ;
}
static int __init _init_clkctrl_providers(void )
{
struct device_node *np;
int ret = 0 ;
for_each_matching_node(np, ti_clkctrl_match_table) {
ret = _setup_clkctrl_provider(np);
if (ret) {
of_node_put(np);
break ;
}
}
return ret;
}
static u32 _omap4_xlate_clkctrl(struct omap_hwmod *oh)
{
if (!oh->prcm.omap4.modulemode)
return 0 ;
return omap_cm_xlate_clkctrl(oh->clkdm->prcm_partition,
oh->clkdm->cm_inst,
oh->prcm.omap4.clkctrl_offs);
}
static struct clk *_lookup_clkctrl_clk(struct omap_hwmod *oh)
{
struct clkctrl_provider *provider;
struct clk *clk;
u32 addr;
if (!soc_ops.xlate_clkctrl)
return NULL;
addr = soc_ops.xlate_clkctrl(oh);
if (!addr)
return NULL;
pr_debug("%s: %s: addr=%x\n" , __func__, oh->name, addr);
list_for_each_entry(provider, &clkctrl_providers, link) {
int i;
for (i = 0 ; i < provider->num_addrs; i++) {
if (provider->addr[i] <= addr &&
provider->addr[i] + provider->size[i] > addr) {
struct of_phandle_args clkspec;
clkspec.np = provider->node;
clkspec.args_count = 2 ;
clkspec.args[0 ] = addr - provider->addr[0 ];
clkspec.args[1 ] = 0 ;
clk = of_clk_get_from_provider(&clkspec);
pr_debug("%s: %s got %p (offset=%x, provider=%pOF)\n" ,
__func__, oh->name, clk,
clkspec.args[0 ], provider->node);
return clk;
}
}
}
return NULL;
}
/**
* _ init_main_clk - get a struct clk * for the hwmod ' s main functional clk
* @ oh : struct omap_hwmod *
*
* Called from _ init_clocks ( ) . Populates the @ oh _ clk ( main
* functional clock pointer ) if a clock matching the hwmod name is found ,
* or a main_clk is present . Returns 0 on success or - EINVAL on error .
*/
static int _init_main_clk(struct omap_hwmod *oh)
{
int ret = 0 ;
struct clk *clk = NULL;
clk = _lookup_clkctrl_clk(oh);
if (!IS_ERR_OR_NULL(clk)) {
pr_debug("%s: mapped main_clk %s for %s\n" , __func__,
__clk_get_name(clk), oh->name);
oh->main_clk = __clk_get_name(clk);
oh->_clk = clk;
soc_ops.disable_direct_prcm(oh);
} else {
if (!oh->main_clk)
return 0 ;
oh->_clk = clk_get(NULL, oh->main_clk);
}
if (IS_ERR(oh->_clk)) {
pr_warn("omap_hwmod: %s: cannot clk_get main_clk %s\n" ,
oh->name, oh->main_clk);
return -EINVAL;
}
/*
* HACK : This needs a re - visit once clk_prepare ( ) is implemented
* to do something meaningful . Today its just a no - op .
* If clk_prepare ( ) is used at some point to do things like
* voltage scaling etc , then this would have to be moved to
* some point where subsystems like i2c and pmic become
* available .
*/
clk_prepare(oh->_clk);
if (!_get_clkdm(oh))
pr_debug("omap_hwmod: %s: missing clockdomain for %s.\n" ,
oh->name, oh->main_clk);
return ret;
}
/**
* _ init_interface_clks - get a struct clk * for the hwmod ' s interface clks
* @ oh : struct omap_hwmod *
*
* Called from _ init_clocks ( ) . Populates the @ oh OCP slave interface
* clock pointers . Returns 0 on success or - EINVAL on error .
*/
static int _init_interface_clks(struct omap_hwmod *oh)
{
struct omap_hwmod_ocp_if *os;
struct clk *c;
int ret = 0 ;
list_for_each_entry(os, &oh->slave_ports, node) {
if (!os->clk)
continue ;
c = clk_get(NULL, os->clk);
if (IS_ERR(c)) {
pr_warn("omap_hwmod: %s: cannot clk_get interface_clk %s\n" ,
oh->name, os->clk);
ret = -EINVAL;
continue ;
}
os->_clk = c;
/*
* HACK : This needs a re - visit once clk_prepare ( ) is implemented
* to do something meaningful . Today its just a no - op .
* If clk_prepare ( ) is used at some point to do things like
* voltage scaling etc , then this would have to be moved to
* some point where subsystems like i2c and pmic become
* available .
*/
clk_prepare(os->_clk);
}
return ret;
}
/**
* _ init_opt_clks - get a struct clk * for the hwmod ' s optional clocks
* @ oh : struct omap_hwmod *
*
* Called from _ init_clocks ( ) . Populates the @ oh omap_hwmod_opt_clk
* clock pointers . Returns 0 on success or - EINVAL on error .
*/
static int _init_opt_clks(struct omap_hwmod *oh)
{
struct omap_hwmod_opt_clk *oc;
struct clk *c;
int i;
int ret = 0 ;
for (i = oh->opt_clks_cnt, oc = oh->opt_clks; i > 0 ; i--, oc++) {
c = clk_get(NULL, oc->clk);
if (IS_ERR(c)) {
pr_warn("omap_hwmod: %s: cannot clk_get opt_clk %s\n" ,
oh->name, oc->clk);
ret = -EINVAL;
continue ;
}
oc->_clk = c;
/*
* HACK : This needs a re - visit once clk_prepare ( ) is implemented
* to do something meaningful . Today its just a no - op .
* If clk_prepare ( ) is used at some point to do things like
* voltage scaling etc , then this would have to be moved to
* some point where subsystems like i2c and pmic become
* available .
*/
clk_prepare(oc->_clk);
}
return ret;
}
static void _enable_optional_clocks(struct omap_hwmod *oh)
{
struct omap_hwmod_opt_clk *oc;
int i;
pr_debug("omap_hwmod: %s: enabling optional clocks\n" , oh->name);
for (i = oh->opt_clks_cnt, oc = oh->opt_clks; i > 0 ; i--, oc++)
if (oc->_clk) {
pr_debug("omap_hwmod: enable %s:%s\n" , oc->role,
__clk_get_name(oc->_clk));
clk_enable(oc->_clk);
}
}
static void _disable_optional_clocks(struct omap_hwmod *oh)
{
struct omap_hwmod_opt_clk *oc;
int i;
pr_debug("omap_hwmod: %s: disabling optional clocks\n" , oh->name);
for (i = oh->opt_clks_cnt, oc = oh->opt_clks; i > 0 ; i--, oc++)
if (oc->_clk) {
pr_debug("omap_hwmod: disable %s:%s\n" , oc->role,
__clk_get_name(oc->_clk));
clk_disable(oc->_clk);
}
}
/**
* _ enable_clocks - enable hwmod main clock and interface clocks
* @ oh : struct omap_hwmod *
*
* Enables all clocks necessary for register reads and writes to succeed
* on the hwmod @ oh . Returns 0 .
*/
static int _enable_clocks(struct omap_hwmod *oh)
{
struct omap_hwmod_ocp_if *os;
pr_debug("omap_hwmod: %s: enabling clocks\n" , oh->name);
if (oh->flags & HWMOD_OPT_CLKS_NEEDED)
_enable_optional_clocks(oh);
if (oh->_clk)
clk_enable(oh->_clk);
list_for_each_entry(os, &oh->slave_ports, node) {
if (os->_clk && (os->flags & OCPIF_SWSUP_IDLE)) {
omap2_clk_deny_idle(os->_clk);
clk_enable(os->_clk);
}
}
/* The opt clocks are controlled by the device driver. */
return 0 ;
}
/**
* _ omap4_clkctrl_managed_by_clkfwk - true if clkctrl managed by clock framework
* @ oh : struct omap_hwmod *
*/
static bool _omap4_clkctrl_managed_by_clkfwk(struct omap_hwmod *oh)
{
if (oh->prcm.omap4.flags & HWMOD_OMAP4_CLKFWK_CLKCTR_CLOCK)
return true ;
return false ;
}
/**
* _ omap4_has_clkctrl_clock - returns true if a module has clkctrl clock
* @ oh : struct omap_hwmod *
*/
static bool _omap4_has_clkctrl_clock(struct omap_hwmod *oh)
{
if (oh->prcm.omap4.clkctrl_offs)
return true ;
if (!oh->prcm.omap4.clkctrl_offs &&
oh->prcm.omap4.flags & HWMOD_OMAP4_ZERO_CLKCTRL_OFFSET)
return true ;
return false ;
}
/**
* _ disable_clocks - disable hwmod main clock and interface clocks
* @ oh : struct omap_hwmod *
*
* Disables the hwmod @ oh main functional and interface clocks . Returns 0 .
*/
static int _disable_clocks(struct omap_hwmod *oh)
{
struct omap_hwmod_ocp_if *os;
pr_debug("omap_hwmod: %s: disabling clocks\n" , oh->name);
if (oh->_clk)
clk_disable(oh->_clk);
list_for_each_entry(os, &oh->slave_ports, node) {
if (os->_clk && (os->flags & OCPIF_SWSUP_IDLE)) {
clk_disable(os->_clk);
omap2_clk_allow_idle(os->_clk);
}
}
if (oh->flags & HWMOD_OPT_CLKS_NEEDED)
_disable_optional_clocks(oh);
/* The opt clocks are controlled by the device driver. */
return 0 ;
}
/**
* _ omap4_enable_module - enable CLKCTRL modulemode on OMAP4
* @ oh : struct omap_hwmod *
*
* Enables the PRCM module mode related to the hwmod @ oh .
* No return value .
*/
static void _omap4_enable_module(struct omap_hwmod *oh)
{
if (!oh->clkdm || !oh->prcm.omap4.modulemode ||
_omap4_clkctrl_managed_by_clkfwk(oh))
return ;
pr_debug("omap_hwmod: %s: %s: %d\n" ,
oh->name, __func__, oh->prcm.omap4.modulemode);
omap_cm_module_enable(oh->prcm.omap4.modulemode,
oh->clkdm->prcm_partition,
oh->clkdm->cm_inst, oh->prcm.omap4.clkctrl_offs);
}
/**
* _ omap4_wait_target_disable - wait for a module to be disabled on OMAP4
* @ oh : struct omap_hwmod *
*
* Wait for a module @ oh to enter slave idle . Returns 0 if the module
* does not have an IDLEST bit or if the module successfully enters
* slave idle ; otherwise , pass along the return value of the
* appropriate * _ cm * _ wait_module_idle ( ) function .
*/
static int _omap4_wait_target_disable(struct omap_hwmod *oh)
{
if (!oh)
return -EINVAL;
if (oh->_int_flags & _HWMOD_NO_MPU_PORT || !oh->clkdm)
return 0 ;
if (oh->flags & HWMOD_NO_IDLEST)
return 0 ;
if (_omap4_clkctrl_managed_by_clkfwk(oh))
return 0 ;
if (!_omap4_has_clkctrl_clock(oh))
return 0 ;
return omap_cm_wait_module_idle(oh->clkdm->prcm_partition,
oh->clkdm->cm_inst,
oh->prcm.omap4.clkctrl_offs, 0 );
}
/**
* _ save_mpu_port_index - find and save the index to @ oh ' s MPU port
* @ oh : struct omap_hwmod *
*
* Determines the array index of the OCP slave port that the MPU uses
* to address the device , and saves it into the struct omap_hwmod .
* Intended to be called during hwmod registration only . No return
* value .
*/
static void __init _save_mpu_port_index(struct omap_hwmod *oh)
{
struct omap_hwmod_ocp_if *os = NULL;
if (!oh)
return ;
oh->_int_flags |= _HWMOD_NO_MPU_PORT;
list_for_each_entry(os, &oh->slave_ports, node) {
if (os->user & OCP_USER_MPU) {
oh->_mpu_port = os;
oh->_int_flags &= ~_HWMOD_NO_MPU_PORT;
break ;
}
}
return ;
}
/**
* _ find_mpu_rt_port - return omap_hwmod_ocp_if accessible by the MPU
* @ oh : struct omap_hwmod *
*
* Given a pointer to a struct omap_hwmod record @ oh , return a pointer
* to the struct omap_hwmod_ocp_if record that is used by the MPU to
* communicate with the IP block . This interface need not be directly
* connected to the MPU ( and almost certainly is not ) , but is directly
* connected to the IP block represented by @ oh . Returns a pointer
* to the struct omap_hwmod_ocp_if * upon success , or returns NULL upon
* error or if there does not appear to be a path from the MPU to this
* IP block .
*/
static struct omap_hwmod_ocp_if *_find_mpu_rt_port(struct omap_hwmod *oh)
{
if (!oh || oh->_int_flags & _HWMOD_NO_MPU_PORT || oh->slaves_cnt == 0 )
return NULL;
return oh->_mpu_port;
};
/**
* _ enable_sysc - try to bring a module out of idle via OCP_SYSCONFIG
* @ oh : struct omap_hwmod *
*
* Ensure that the OCP_SYSCONFIG register for the IP block represented
* by @ oh is set to indicate to the PRCM that the IP block is active .
* Usually this means placing the module into smart - idle mode and
* smart - standby , but if there is a bug in the automatic idle handling
* for the IP block , it may need to be placed into the force - idle or
* no - idle variants of these modes . No return value .
*/
static void _enable_sysc(struct omap_hwmod *oh)
{
u8 idlemode, sf;
u32 v;
bool clkdm_act;
struct clockdomain *clkdm;
if (!oh->class ->sysc)
return ;
/*
* Wait until reset has completed , this is needed as the IP
* block is reset automatically by hardware in some cases
* ( off - mode for example ) , and the drivers require the
* IP to be ready when they access it
*/
if (oh->flags & HWMOD_CONTROL_OPT_CLKS_IN_RESET)
_enable_optional_clocks(oh);
_wait_softreset_complete(oh);
if (oh->flags & HWMOD_CONTROL_OPT_CLKS_IN_RESET)
_disable_optional_clocks(oh);
v = oh->_sysc_cache;
sf = oh->class ->sysc->sysc_flags;
clkdm = _get_clkdm(oh);
if (sf & SYSC_HAS_SIDLEMODE) {
if (oh->flags & HWMOD_SWSUP_SIDLE ||
oh->flags & HWMOD_SWSUP_SIDLE_ACT) {
idlemode = HWMOD_IDLEMODE_NO;
} else {
if (sf & SYSC_HAS_ENAWAKEUP)
_enable_wakeup(oh, &v);
if (oh->class ->sysc->idlemodes & SIDLE_SMART_WKUP)
idlemode = HWMOD_IDLEMODE_SMART_WKUP;
else
idlemode = HWMOD_IDLEMODE_SMART;
}
/*
* This is special handling for some IPs like
* 32 k sync timer . Force them to idle !
*/
clkdm_act = (clkdm && clkdm->flags & CLKDM_ACTIVE_WITH_MPU);
if (clkdm_act && !(oh->class ->sysc->idlemodes &
(SIDLE_SMART | SIDLE_SMART_WKUP)))
idlemode = HWMOD_IDLEMODE_FORCE;
_set_slave_idlemode(oh, idlemode, &v);
}
if (sf & SYSC_HAS_MIDLEMODE) {
if (oh->flags & HWMOD_FORCE_MSTANDBY) {
idlemode = HWMOD_IDLEMODE_FORCE;
} else if (oh->flags & HWMOD_SWSUP_MSTANDBY) {
idlemode = HWMOD_IDLEMODE_NO;
} else {
if (sf & SYSC_HAS_ENAWAKEUP)
_enable_wakeup(oh, &v);
if (oh->class ->sysc->idlemodes & MSTANDBY_SMART_WKUP)
idlemode = HWMOD_IDLEMODE_SMART_WKUP;
else
idlemode = HWMOD_IDLEMODE_SMART;
}
_set_master_standbymode(oh, idlemode, &v);
}
/*
* XXX The clock framework should handle this , by
* calling into this code . But this must wait until the
* clock structures are tagged with omap_hwmod entries
*/
if ((oh->flags & HWMOD_SET_DEFAULT_CLOCKACT) &&
(sf & SYSC_HAS_CLOCKACTIVITY))
_set_clockactivity(oh, CLOCKACT_TEST_ICLK, &v);
_write_sysconfig(v, oh);
/*
* Set the autoidle bit only after setting the smartidle bit
* Setting this will not have any impact on the other modules .
*/
if (sf & SYSC_HAS_AUTOIDLE) {
idlemode = (oh->flags & HWMOD_NO_OCP_AUTOIDLE) ?
0 : 1 ;
_set_module_autoidle(oh, idlemode, &v);
_write_sysconfig(v, oh);
}
}
/**
* _ idle_sysc - try to put a module into idle via OCP_SYSCONFIG
* @ oh : struct omap_hwmod *
*
* If module is marked as SWSUP_SIDLE , force the module into slave
* idle ; otherwise , configure it for smart - idle . If module is marked
* as SWSUP_MSUSPEND , force the module into master standby ; otherwise ,
* configure it for smart - standby . No return value .
*/
static void _idle_sysc(struct omap_hwmod *oh)
{
u8 idlemode, sf;
u32 v;
if (!oh->class ->sysc)
return ;
v = oh->_sysc_cache;
sf = oh->class ->sysc->sysc_flags;
if (sf & SYSC_HAS_SIDLEMODE) {
if (oh->flags & HWMOD_SWSUP_SIDLE) {
idlemode = HWMOD_IDLEMODE_FORCE;
} else {
if (sf & SYSC_HAS_ENAWAKEUP)
_enable_wakeup(oh, &v);
if (oh->class ->sysc->idlemodes & SIDLE_SMART_WKUP)
idlemode = HWMOD_IDLEMODE_SMART_WKUP;
else
idlemode = HWMOD_IDLEMODE_SMART;
}
_set_slave_idlemode(oh, idlemode, &v);
}
if (sf & SYSC_HAS_MIDLEMODE) {
if ((oh->flags & HWMOD_SWSUP_MSTANDBY) ||
(oh->flags & HWMOD_FORCE_MSTANDBY)) {
idlemode = HWMOD_IDLEMODE_FORCE;
} else {
if (sf & SYSC_HAS_ENAWAKEUP)
_enable_wakeup(oh, &v);
if (oh->class ->sysc->idlemodes & MSTANDBY_SMART_WKUP)
idlemode = HWMOD_IDLEMODE_SMART_WKUP;
else
idlemode = HWMOD_IDLEMODE_SMART;
}
_set_master_standbymode(oh, idlemode, &v);
}
/* If the cached value is the same as the new value, skip the write */
if (oh->_sysc_cache != v)
_write_sysconfig(v, oh);
}
/**
* _ shutdown_sysc - force a module into idle via OCP_SYSCONFIG
* @ oh : struct omap_hwmod *
*
* Force the module into slave idle and master suspend . No return
* value .
*/
static void _shutdown_sysc(struct omap_hwmod *oh)
{
u32 v;
u8 sf;
if (!oh->class ->sysc)
return ;
v = oh->_sysc_cache;
sf = oh->class ->sysc->sysc_flags;
if (sf & SYSC_HAS_SIDLEMODE)
_set_slave_idlemode(oh, HWMOD_IDLEMODE_FORCE, &v);
if (sf & SYSC_HAS_MIDLEMODE)
_set_master_standbymode(oh, HWMOD_IDLEMODE_FORCE, &v);
if (sf & SYSC_HAS_AUTOIDLE)
_set_module_autoidle(oh, 1 , &v);
_write_sysconfig(v, oh);
}
/**
* _ lookup - find an omap_hwmod by name
* @ name : find an omap_hwmod by name
*
* Return a pointer to an omap_hwmod by name , or NULL if not found .
*/
static struct omap_hwmod *_lookup(const char *name)
{
struct omap_hwmod *oh, *temp_oh;
oh = NULL;
list_for_each_entry(temp_oh, &omap_hwmod_list, node) {
if (!strcmp(name, temp_oh->name)) {
oh = temp_oh;
break ;
}
}
return oh;
}
/**
* _ init_clkdm - look up a clockdomain name , store pointer in omap_hwmod
* @ oh : struct omap_hwmod *
*
* Convert a clockdomain name stored in a struct omap_hwmod into a
* clockdomain pointer , and save it into the struct omap_hwmod .
* Return - EINVAL if the clkdm_name lookup failed .
*/
static int _init_clkdm(struct omap_hwmod *oh)
{
if (!oh->clkdm_name) {
pr_debug("omap_hwmod: %s: missing clockdomain\n" , oh->name);
return 0 ;
}
oh->clkdm = clkdm_lookup(oh->clkdm_name);
if (!oh->clkdm) {
pr_warn("omap_hwmod: %s: could not associate to clkdm %s\n" ,
oh->name, oh->clkdm_name);
return 0 ;
}
pr_debug("omap_hwmod: %s: associated to clkdm %s\n" ,
oh->name, oh->clkdm_name);
return 0 ;
}
/**
* _ init_clocks - clk_get ( ) all clocks associated with this hwmod . Retrieve as
* well the clockdomain .
* @ oh : struct omap_hwmod *
* @ np : device_node mapped to this hwmod
*
* Called by omap_hwmod_setup_ * ( ) ( after omap2_clk_init ( ) ) .
* Resolves all clock names embedded in the hwmod . Returns 0 on
* success , or a negative error code on failure .
*/
static int _init_clocks(struct omap_hwmod *oh, struct device_node *np)
{
int ret = 0 ;
if (oh->_state != _HWMOD_STATE_REGISTERED)
return 0 ;
pr_debug("omap_hwmod: %s: looking up clocks\n" , oh->name);
if (soc_ops.init_clkdm)
ret |= soc_ops.init_clkdm(oh);
ret |= _init_main_clk(oh);
ret |= _init_interface_clks(oh);
ret |= _init_opt_clks(oh);
if (!ret)
oh->_state = _HWMOD_STATE_CLKS_INITED;
else
pr_warn("omap_hwmod: %s: cannot _init_clocks\n" , oh->name);
return ret;
}
/**
* _ lookup_hardreset - fill register bit info for this hwmod / reset line
* @ oh : struct omap_hwmod *
* @ name : name of the reset line in the context of this hwmod
* @ ohri : struct omap_hwmod_rst_info * that this function will fill in
*
* Return the bit position of the reset line that match the
* input name . Return - ENOENT if not found .
*/
static int _lookup_hardreset(struct omap_hwmod *oh, const char *name,
struct omap_hwmod_rst_info *ohri)
{
int i;
for (i = 0 ; i < oh->rst_lines_cnt; i++) {
const char *rst_line = oh->rst_lines[i].name;
if (!strcmp(rst_line, name)) {
ohri->rst_shift = oh->rst_lines[i].rst_shift;
ohri->st_shift = oh->rst_lines[i].st_shift;
pr_debug("omap_hwmod: %s: %s: %s: rst %d st %d\n" ,
oh->name, __func__, rst_line, ohri->rst_shift,
ohri->st_shift);
return 0 ;
}
}
return -ENOENT;
}
/**
* _ assert_hardreset - assert the HW reset line of submodules
* contained in the hwmod module .
* @ oh : struct omap_hwmod *
* @ name : name of the reset line to lookup and assert
*
* Some IP like dsp , ipu or iva contain processor that require an HW
* reset line to be assert / deassert in order to enable fully the IP .
* Returns - EINVAL if @ oh is null , - ENOSYS if we have no way of
* asserting the hardreset line on the currently - booted SoC , or passes
* along the return value from _ lookup_hardreset ( ) or the SoC ' s
* assert_hardreset code .
*/
static int _assert_hardreset(struct omap_hwmod *oh, const char *name)
{
struct omap_hwmod_rst_info ohri;
int ret = -EINVAL;
if (!oh)
return -EINVAL;
if (!soc_ops.assert_hardreset)
return -ENOSYS;
ret = _lookup_hardreset(oh, name, &ohri);
if (ret < 0 )
return ret;
ret = soc_ops.assert_hardreset(oh, &ohri);
return ret;
}
/**
* _ deassert_hardreset - deassert the HW reset line of submodules contained
* in the hwmod module .
* @ oh : struct omap_hwmod *
* @ name : name of the reset line to look up and deassert
*
* Some IP like dsp , ipu or iva contain processor that require an HW
* reset line to be assert / deassert in order to enable fully the IP .
* Returns - EINVAL if @ oh is null , - ENOSYS if we have no way of
* deasserting the hardreset line on the currently - booted SoC , or passes
* along the return value from _ lookup_hardreset ( ) or the SoC ' s
* deassert_hardreset code .
*/
static int _deassert_hardreset(struct omap_hwmod *oh, const char *name)
{
struct omap_hwmod_rst_info ohri;
int ret = -EINVAL;
if (!oh)
return -EINVAL;
if (!soc_ops.deassert_hardreset)
return -ENOSYS;
ret = _lookup_hardreset(oh, name, &ohri);
if (ret < 0 )
return ret;
if (oh->clkdm) {
/*
* A clockdomain must be in SW_SUP otherwise reset
* might not be completed . The clockdomain can be set
* in HW_AUTO only when the module become ready .
*/
clkdm_deny_idle(oh->clkdm);
ret = clkdm_hwmod_enable(oh->clkdm, oh);
if (ret) {
WARN(1 , "omap_hwmod: %s: could not enable clockdomain %s: %d\n" ,
oh->name, oh->clkdm->name, ret);
return ret;
}
}
_enable_clocks(oh);
if (soc_ops.enable_module)
soc_ops.enable_module(oh);
ret = soc_ops.deassert_hardreset(oh, &ohri);
if (soc_ops.disable_module)
soc_ops.disable_module(oh);
_disable_clocks(oh);
if (ret == -EBUSY)
pr_warn("omap_hwmod: %s: failed to hardreset\n" , oh->name);
if (oh->clkdm) {
/*
* Set the clockdomain to HW_AUTO , assuming that the
* previous state was HW_AUTO .
*/
clkdm_allow_idle(oh->clkdm);
clkdm_hwmod_disable(oh->clkdm, oh);
}
return ret;
}
/**
* _ read_hardreset - read the HW reset line state of submodules
* contained in the hwmod module
* @ oh : struct omap_hwmod *
* @ name : name of the reset line to look up and read
*
* Return the state of the reset line . Returns - EINVAL if @ oh is
* null , - ENOSYS if we have no way of reading the hardreset line
* status on the currently - booted SoC , or passes along the return
* value from _ lookup_hardreset ( ) or the SoC ' s is_hardreset_asserted
* code .
*/
static int _read_hardreset(struct omap_hwmod *oh, const char *name)
{
struct omap_hwmod_rst_info ohri;
int ret = -EINVAL;
if (!oh)
return -EINVAL;
if (!soc_ops.is_hardreset_asserted)
return -ENOSYS;
ret = _lookup_hardreset(oh, name, &ohri);
if (ret < 0 )
return ret;
return soc_ops.is_hardreset_asserted(oh, &ohri);
}
/**
* _ are_all_hardreset_lines_asserted - return true if the @ oh is hard - reset
* @ oh : struct omap_hwmod *
*
* If all hardreset lines associated with @ oh are asserted , then return true .
* Otherwise , if part of @ oh is out hardreset or if no hardreset lines
* associated with @ oh are asserted , then return false .
* This function is used to avoid executing some parts of the IP block
* enable / disable sequence if its hardreset line is set .
*/
static bool _are_all_hardreset_lines_asserted(struct omap_hwmod *oh)
{
int i, rst_cnt = 0 ;
if (oh->rst_lines_cnt == 0 )
return false ;
for (i = 0 ; i < oh->rst_lines_cnt; i++)
if (_read_hardreset(oh, oh->rst_lines[i].name) > 0 )
rst_cnt++;
if (oh->rst_lines_cnt == rst_cnt)
return true ;
return false ;
}
/**
* _ are_any_hardreset_lines_asserted - return true if any part of @ oh is
* hard - reset
* @ oh : struct omap_hwmod *
*
* If any hardreset lines associated with @ oh are asserted , then
* return true . Otherwise , if no hardreset lines associated with @ oh
* are asserted , or if @ oh has no hardreset lines , then return false .
* This function is used to avoid executing some parts of the IP block
* enable / disable sequence if any hardreset line is set .
*/
static bool _are_any_hardreset_lines_asserted(struct omap_hwmod *oh)
{
int rst_cnt = 0 ;
int i;
for (i = 0 ; i < oh->rst_lines_cnt && rst_cnt == 0 ; i++)
if (_read_hardreset(oh, oh->rst_lines[i].name) > 0 )
rst_cnt++;
return (rst_cnt) ? true : false ;
}
/**
* _ omap4_disable_module - enable CLKCTRL modulemode on OMAP4
* @ oh : struct omap_hwmod *
*
* Disable the PRCM module mode related to the hwmod @ oh .
* Return EINVAL if the modulemode is not supported and 0 in case of success .
*/
static int _omap4_disable_module(struct omap_hwmod *oh)
{
int v;
if (!oh->clkdm || !oh->prcm.omap4.modulemode ||
_omap4_clkctrl_managed_by_clkfwk(oh))
return -EINVAL;
/*
* Since integration code might still be doing something , only
* disable if all lines are under hardreset .
*/
if (_are_any_hardreset_lines_asserted(oh))
return 0 ;
pr_debug("omap_hwmod: %s: %s\n" , oh->name, __func__);
omap_cm_module_disable(oh->clkdm->prcm_partition, oh->clkdm->cm_inst,
oh->prcm.omap4.clkctrl_offs);
v = _omap4_wait_target_disable(oh);
if (v)
pr_warn("omap_hwmod: %s: _wait_target_disable failed\n" ,
oh->name);
return 0 ;
}
/**
* _ ocp_softreset - reset an omap_hwmod via the OCP_SYSCONFIG bit
* @ oh : struct omap_hwmod *
*
* Resets an omap_hwmod @ oh via the OCP_SYSCONFIG bit . hwmod must be
* enabled for this to work . Returns - ENOENT if the hwmod cannot be
* reset this way , - EINVAL if the hwmod is in the wrong state ,
* - ETIMEDOUT if the module did not reset in time , or 0 upon success .
*
* In OMAP3 a specific SYSSTATUS register is used to get the reset status .
* Starting in OMAP4 , some IPs do not have SYSSTATUS registers and instead
* use the SYSCONFIG softreset bit to provide the status .
*
* Note that some IP like McBSP do have reset control but don ' t have
* reset status .
*/
static int _ocp_softreset(struct omap_hwmod *oh)
{
u32 v;
int c = 0 ;
int ret = 0 ;
if (!oh->class ->sysc ||
!(oh->class ->sysc->sysc_flags & SYSC_HAS_SOFTRESET))
return -ENOENT;
/* clocks must be on for this operation */
if (oh->_state != _HWMOD_STATE_ENABLED) {
pr_warn("omap_hwmod: %s: reset can only be entered from enabled state\n" ,
oh->name);
return -EINVAL;
}
/* For some modules, all optionnal clocks need to be enabled as well */
if (oh->flags & HWMOD_CONTROL_OPT_CLKS_IN_RESET)
_enable_optional_clocks(oh);
pr_debug("omap_hwmod: %s: resetting via OCP SOFTRESET\n" , oh->name);
v = oh->_sysc_cache;
ret = _set_softreset(oh, &v);
if (ret)
goto dis_opt_clks;
_write_sysconfig(v, oh);
if (oh->class ->sysc->srst_udelay)
udelay(oh->class ->sysc->srst_udelay);
c = _wait_softreset_complete(oh);
if (c == MAX_MODULE_SOFTRESET_WAIT) {
pr_warn("omap_hwmod: %s: softreset failed (waited %d usec)\n" ,
oh->name, MAX_MODULE_SOFTRESET_WAIT);
ret = -ETIMEDOUT;
goto dis_opt_clks;
} else {
pr_debug("omap_hwmod: %s: softreset in %d usec\n" , oh->name, c);
}
ret = _clear_softreset(oh, &v);
if (ret)
goto dis_opt_clks;
_write_sysconfig(v, oh);
/*
* XXX add _ HWMOD_STATE_WEDGED for modules that don ' t come back from
* _ wait_target_ready ( ) or _ reset ( )
*/
dis_opt_clks:
if (oh->flags & HWMOD_CONTROL_OPT_CLKS_IN_RESET)
_disable_optional_clocks(oh);
return ret;
}
/**
* _ reset - reset an omap_hwmod
* @ oh : struct omap_hwmod *
*
* Resets an omap_hwmod @ oh . If the module has a custom reset
* function pointer defined , then call it to reset the IP block , and
* pass along its return value to the caller . Otherwise , if the IP
* block has an OCP_SYSCONFIG register with a SOFTRESET bitfield
* associated with it , call a function to reset the IP block via that
* method , and pass along the return value to the caller . Finally , if
* the IP block has some hardreset lines associated with it , assert
* all of those , but do _ not_ deassert them . ( This is because driver
* authors have expressed an apparent requirement to control the
* deassertion of the hardreset lines themselves . )
*
* The default software reset mechanism for most OMAP IP blocks is
* triggered via the OCP_SYSCONFIG . SOFTRESET bit . However , some
* hwmods cannot be reset via this method . Some are not targets and
* therefore have no OCP header registers to access . Others ( like the
* IVA ) have idiosyncratic reset sequences . So for these relatively
* rare cases , custom reset code can be supplied in the struct
* omap_hwmod_class . reset function pointer .
*
* _ set_dmadisable ( ) is called to set the DMADISABLE bit so that it
* does not prevent idling of the system . This is necessary for cases
* where ROMCODE / BOOTLOADER uses dma and transfers control to the
* kernel without disabling dma .
*
* Passes along the return value from either _ ocp_softreset ( ) or the
* custom reset function - these must return - EINVAL if the hwmod
* cannot be reset this way or if the hwmod is in the wrong state ,
* - ETIMEDOUT if the module did not reset in time , or 0 upon success .
*/
static int _reset(struct omap_hwmod *oh)
{
int i, r;
pr_debug("omap_hwmod: %s: resetting\n" , oh->name);
if (oh->class ->reset) {
r = oh->class ->reset(oh);
} else {
if (oh->rst_lines_cnt > 0 ) {
for (i = 0 ; i < oh->rst_lines_cnt; i++)
_assert_hardreset(oh, oh->rst_lines[i].name);
return 0 ;
} else {
r = _ocp_softreset(oh);
if (r == -ENOENT)
r = 0 ;
}
}
_set_dmadisable(oh);
/*
* OCP_SYSCONFIG bits need to be reprogrammed after a
* softreset . The _ enable ( ) function should be split to avoid
* the rewrite of the OCP_SYSCONFIG register .
*/
if (oh->class ->sysc) {
_update_sysc_cache(oh);
_enable_sysc(oh);
}
return r;
}
/**
* _ omap4_update_context_lost - increment hwmod context loss counter if
* hwmod context was lost , and clear hardware context loss reg
* @ oh : hwmod to check for context loss
*
* If the PRCM indicates that the hwmod @ oh lost context , increment
* our in - memory context loss counter , and clear the RM_ * _ CONTEXT
* bits . No return value .
*/
static void _omap4_update_context_lost(struct omap_hwmod *oh)
{
if (oh->prcm.omap4.flags & HWMOD_OMAP4_NO_CONTEXT_LOSS_BIT)
return ;
if (!prm_was_any_context_lost_old(oh->clkdm->pwrdm.ptr->prcm_partition,
oh->clkdm->pwrdm.ptr->prcm_offs,
oh->prcm.omap4.context_offs))
return ;
oh->prcm.omap4.context_lost_counter++;
prm_clear_context_loss_flags_old(oh->clkdm->pwrdm.ptr->prcm_partition,
oh->clkdm->pwrdm.ptr->prcm_offs,
oh->prcm.omap4.context_offs);
}
/**
* _ omap4_get_context_lost - get context loss counter for a hwmod
* @ oh : hwmod to get context loss counter for
*
* Returns the in - memory context loss counter for a hwmod .
*/
static int _omap4_get_context_lost(struct omap_hwmod *oh)
{
return oh->prcm.omap4.context_lost_counter;
}
/**
* _ enable - enable an omap_hwmod
* @ oh : struct omap_hwmod *
*
* Enables an omap_hwmod @ oh such that the MPU can access the hwmod ' s
* register target . Returns - EINVAL if the hwmod is in the wrong
* state or passes along the return value of _ wait_target_ready ( ) .
*/
static int _enable(struct omap_hwmod *oh)
{
int r;
pr_debug("omap_hwmod: %s: enabling\n" , oh->name);
/*
* hwmods with HWMOD_INIT_NO_IDLE flag set are left in enabled
* state at init .
*/
if (oh->_int_flags & _HWMOD_SKIP_ENABLE) {
oh->_int_flags &= ~_HWMOD_SKIP_ENABLE;
return 0 ;
}
if (oh->_state != _HWMOD_STATE_INITIALIZED &&
oh->_state != _HWMOD_STATE_IDLE &&
oh->_state != _HWMOD_STATE_DISABLED) {
WARN(1 , "omap_hwmod: %s: enabled state can only be entered from initialized, idle, or disabled state\n" ,
oh->name);
return -EINVAL;
}
/*
* If an IP block contains HW reset lines and all of them are
* asserted , we let integration code associated with that
* block handle the enable . We ' ve received very little
* information on what those driver authors need , and until
* detailed information is provided and the driver code is
* posted to the public lists , this is probably the best we
* can do .
*/
if (_are_all_hardreset_lines_asserted(oh))
return 0 ;
_add_initiator_dep(oh, mpu_oh);
if (oh->clkdm) {
/*
* A clockdomain must be in SW_SUP before enabling
* completely the module . The clockdomain can be set
* in HW_AUTO only when the module become ready .
*/
clkdm_deny_idle(oh->clkdm);
r = clkdm_hwmod_enable(oh->clkdm, oh);
if (r) {
WARN(1 , "omap_hwmod: %s: could not enable clockdomain %s: %d\n" ,
oh->name, oh->clkdm->name, r);
return r;
}
}
_enable_clocks(oh);
if (soc_ops.enable_module)
soc_ops.enable_module(oh);
if (oh->flags & HWMOD_BLOCK_WFI)
cpu_idle_poll_ctrl(true );
if (soc_ops.update_context_lost)
soc_ops.update_context_lost(oh);
r = (soc_ops.wait_target_ready) ? soc_ops.wait_target_ready(oh) :
-EINVAL;
if (oh->clkdm && !(oh->flags & HWMOD_CLKDM_NOAUTO))
clkdm_allow_idle(oh->clkdm);
if (!r) {
oh->_state = _HWMOD_STATE_ENABLED;
/* Access the sysconfig only if the target is ready */
if (oh->class ->sysc) {
if (!(oh->_int_flags & _HWMOD_SYSCONFIG_LOADED))
_update_sysc_cache(oh);
_enable_sysc(oh);
}
} else {
if (soc_ops.disable_module)
soc_ops.disable_module(oh);
_disable_clocks(oh);
pr_err("omap_hwmod: %s: _wait_target_ready failed: %d\n" ,
oh->name, r);
if (oh->clkdm)
clkdm_hwmod_disable(oh->clkdm, oh);
}
return r;
}
/**
* _ idle - idle an omap_hwmod
* @ oh : struct omap_hwmod *
*
* Idles an omap_hwmod @ oh . This should be called once the hwmod has
* no further work . Returns - EINVAL if the hwmod is in the wrong
* state or returns 0 .
*/
static int _idle(struct omap_hwmod *oh)
{
if (oh->flags & HWMOD_NO_IDLE) {
oh->_int_flags |= _HWMOD_SKIP_ENABLE;
return 0 ;
}
pr_debug("omap_hwmod: %s: idling\n" , oh->name);
if (_are_all_hardreset_lines_asserted(oh))
return 0 ;
if (oh->_state != _HWMOD_STATE_ENABLED) {
WARN(1 , "omap_hwmod: %s: idle state can only be entered from enabled state\n" ,
oh->name);
return -EINVAL;
}
if (oh->class ->sysc)
_idle_sysc(oh);
_del_initiator_dep(oh, mpu_oh);
/*
* If HWMOD_CLKDM_NOAUTO is set then we don ' t
* deny idle the clkdm again since idle was already denied
* in _ enable ( )
*/
if (oh->clkdm && !(oh->flags & HWMOD_CLKDM_NOAUTO))
clkdm_deny_idle(oh->clkdm);
if (oh->flags & HWMOD_BLOCK_WFI)
cpu_idle_poll_ctrl(false );
if (soc_ops.disable_module)
soc_ops.disable_module(oh);
/*
* The module must be in idle mode before disabling any parents
* clocks . Otherwise , the parent clock might be disabled before
* the module transition is done , and thus will prevent the
* transition to complete properly .
*/
_disable_clocks(oh);
if (oh->clkdm) {
clkdm_allow_idle(oh->clkdm);
clkdm_hwmod_disable(oh->clkdm, oh);
}
oh->_state = _HWMOD_STATE_IDLE;
return 0 ;
}
/**
* _ shutdown - shutdown an omap_hwmod
* @ oh : struct omap_hwmod *
*
* Shut down an omap_hwmod @ oh . This should be called when the driver
* used for the hwmod is removed or unloaded or if the driver is not
* used by the system . Returns - EINVAL if the hwmod is in the wrong
* state or returns 0 .
*/
static int _shutdown(struct omap_hwmod *oh)
{
int ret, i;
u8 prev_state;
if (_are_all_hardreset_lines_asserted(oh))
return 0 ;
if (oh->_state != _HWMOD_STATE_IDLE &&
oh->_state != _HWMOD_STATE_ENABLED) {
WARN(1 , "omap_hwmod: %s: disabled state can only be entered from idle, or enabled state\n" ,
oh->name);
return -EINVAL;
}
pr_debug("omap_hwmod: %s: disabling\n" , oh->name);
if (oh->class ->pre_shutdown) {
prev_state = oh->_state;
if (oh->_state == _HWMOD_STATE_IDLE)
_enable(oh);
ret = oh->class ->pre_shutdown(oh);
if (ret) {
if (prev_state == _HWMOD_STATE_IDLE)
_idle(oh);
return ret;
}
}
if (oh->class ->sysc) {
if (oh->_state == _HWMOD_STATE_IDLE)
_enable(oh);
_shutdown_sysc(oh);
}
/* clocks and deps are already disabled in idle */
if (oh->_state == _HWMOD_STATE_ENABLED) {
_del_initiator_dep(oh, mpu_oh);
/* XXX what about the other system initiators here? dma, dsp */
if (oh->flags & HWMOD_BLOCK_WFI)
cpu_idle_poll_ctrl(false );
if (soc_ops.disable_module)
soc_ops.disable_module(oh);
_disable_clocks(oh);
if (oh->clkdm)
clkdm_hwmod_disable(oh->clkdm, oh);
}
/* XXX Should this code also force-disable the optional clocks? */
for (i = 0 ; i < oh->rst_lines_cnt; i++)
_assert_hardreset(oh, oh->rst_lines[i].name);
oh->_state = _HWMOD_STATE_DISABLED;
return 0 ;
}
static int of_dev_find_hwmod(struct device_node *np,
struct omap_hwmod *oh)
{
int count, i, res;
const char *p;
count = of_property_count_strings(np, "ti,hwmods" );
if (count < 1 )
return -ENODEV;
for (i = 0 ; i < count; i++) {
res = of_property_read_string_index(np, "ti,hwmods" ,
i, &p);
if (res)
continue ;
if (!strcmp(p, oh->name)) {
pr_debug("omap_hwmod: dt %pOFn[%i] uses hwmod %s\n" ,
np, i, oh->name);
return i;
}
}
return -ENODEV;
}
/**
* of_dev_hwmod_lookup - look up needed hwmod from dt blob
* @ np : struct device_node *
* @ oh : struct omap_hwmod *
* @ index : index of the entry found
* @ found : struct device_node * found or NULL
*
* Parse the dt blob and find out needed hwmod . Recursive function is
* implemented to take care hierarchical dt blob parsing .
* Return : Returns 0 on success , - ENODEV when not found .
*/
static int of_dev_hwmod_lookup(struct device_node *np,
struct omap_hwmod *oh,
int *index,
struct device_node **found)
{
struct device_node *np0 = NULL;
int res;
res = of_dev_find_hwmod(np, oh);
if (res >= 0 ) {
*found = np;
*index = res;
return 0 ;
}
for_each_child_of_node(np, np0) {
struct device_node *fc;
int i;
res = of_dev_hwmod_lookup(np0, oh, &i, &fc);
if (res == 0 ) {
*found = fc;
*index = i;
of_node_put(np0);
return 0 ;
}
}
*found = NULL;
*index = 0 ;
return -ENODEV;
}
/**
* omap_hwmod_fix_mpu_rt_idx - fix up mpu_rt_idx register offsets
*
* @ oh : struct omap_hwmod *
* @ np : struct device_node *
*
* Fix up module register offsets for modules with mpu_rt_idx .
* Only needed for cpsw with interconnect target module defined
* in device tree while still using legacy hwmod platform data
* for rev , sysc and syss registers .
*
* Can be removed when all cpsw hwmod platform data has been
* dropped .
*/
static void omap_hwmod_fix_mpu_rt_idx(struct omap_hwmod *oh,
struct device_node *np,
struct resource *res)
{
struct device_node *child = NULL;
int error;
child = of_get_next_child(np, child);
if (!child)
return ;
error = of_address_to_resource(child, oh->mpu_rt_idx, res);
if (error)
pr_err("%s: error mapping mpu_rt_idx: %i\n" ,
__func__, error);
}
/**
* omap_hwmod_parse_module_range - map module IO range from device tree
* @ oh : struct omap_hwmod *
* @ np : struct device_node *
*
* Parse the device tree range an interconnect target module provides
* for it ' s child device IP blocks . This way we can support the old
* " ti , hwmods " property with just dts data without a need for platform
* data for IO resources . And we don ' t need all the child IP device
* nodes available in the dts .
*/
int omap_hwmod_parse_module_range(struct omap_hwmod *oh,
struct device_node *np,
struct resource *res)
{
struct property *prop;
const char *name;
int err;
of_property_for_each_string(np, "compatible" , prop, name)
if (!strncmp("ti,sysc-" , name, 8 ))
break ;
if (!name)
return -ENOENT;
err = of_range_to_resource(np, 0 , res);
if (err)
return err;
pr_debug("omap_hwmod: %s %pOFn at %pR\n" ,
oh->name, np, res);
if (oh && oh->mpu_rt_idx) {
omap_hwmod_fix_mpu_rt_idx(oh, np, res);
return 0 ;
}
return 0 ;
}
/**
* _ init_mpu_rt_base - populate the virtual address for a hwmod
* @ oh : struct omap_hwmod * to locate the virtual address
* @ data : ( unused , caller should pass NULL )
* @ index : index of the reg entry iospace in device tree
* @ np : struct device_node * of the IP block ' s device node in the DT data
*
* Cache the virtual address used by the MPU to access this IP block ' s
* registers . This address is needed early so the OCP registers that
* are part of the device ' s address space can be ioremapped properly .
*
* If SYSC access is not needed , the registers will not be remapped
* and non - availability of MPU access is not treated as an error .
*
* Returns 0 on success , - EINVAL if an invalid hwmod is passed , and
* - ENXIO on absent or invalid register target address space .
*/
static int __init _init_mpu_rt_base(struct omap_hwmod *oh, void *data,
int index, struct device_node *np)
{
void __iomem *va_start = NULL;
struct resource res;
int error;
if (!oh)
return -EINVAL;
_save_mpu_port_index(oh);
/* if we don't need sysc access we don't need to ioremap */
if (!oh->class ->sysc)
return 0 ;
/* we can't continue without MPU PORT if we need sysc access */
if (oh->_int_flags & _HWMOD_NO_MPU_PORT)
return -ENXIO;
if (!np) {
pr_err("omap_hwmod: %s: no dt node\n" , oh->name);
return -ENXIO;
}
/* Do we have a dts range for the interconnect target module? */
error = omap_hwmod_parse_module_range(oh, np, &res);
if (!error)
va_start = ioremap(res.start, resource_size(&res));
/* No ranges, rely on device reg entry */
if (!va_start)
va_start = of_iomap(np, index + oh->mpu_rt_idx);
if (!va_start) {
pr_err("omap_hwmod: %s: Missing dt reg%i for %pOF\n" ,
oh->name, index, np);
return -ENXIO;
}
pr_debug("omap_hwmod: %s: MPU register target at va %p\n" ,
oh->name, va_start);
oh->_mpu_rt_va = va_start;
return 0 ;
}
static void __init parse_module_flags(struct omap_hwmod *oh,
struct device_node *np)
{
if (of_property_read_bool(np, "ti,no-reset-on-init" ))
oh->flags |= HWMOD_INIT_NO_RESET;
if (of_property_read_bool(np, "ti,no-idle-on-init" ))
oh->flags |= HWMOD_INIT_NO_IDLE;
if (of_property_read_bool(np, "ti,no-idle" ))
oh->flags |= HWMOD_NO_IDLE;
}
/**
* _ init - initialize internal data for the hwmod @ oh
* @ oh : struct omap_hwmod *
* @ data : ( unused )
*
* Look up the clocks and the address space used by the MPU to access
* registers belonging to the hwmod @ oh . @ oh must already be
* registered at this point . This is the first of two phases for
* hwmod initialization . Code called here does not touch any hardware
* registers , it simply prepares internal data structures . Returns 0
* upon success or if the hwmod isn ' t registered or if the hwmod ' s
* address space is not defined , or - EINVAL upon failure .
*/
static int __init _init(struct omap_hwmod *oh, void *data)
{
int r, index;
struct device_node *np = NULL;
struct device_node *bus;
if (oh->_state != _HWMOD_STATE_REGISTERED)
return 0 ;
bus = of_find_node_by_name(NULL, "ocp" );
if (!bus)
return -ENODEV;
r = of_dev_hwmod_lookup(bus, oh, &index, &np);
if (r)
pr_debug("omap_hwmod: %s missing dt data\n" , oh->name);
else if (np && index)
pr_warn("omap_hwmod: %s using broken dt data from %pOFn\n" ,
oh->name, np);
r = _init_mpu_rt_base(oh, NULL, index, np);
if (r < 0 ) {
WARN(1 , "omap_hwmod: %s: doesn't have mpu register target base\n" ,
oh->name);
return 0 ;
}
r = _init_clocks(oh, np);
if (r < 0 ) {
WARN(1 , "omap_hwmod: %s: couldn't init clocks\n" , oh->name);
return -EINVAL;
}
if (np) {
struct device_node *child;
parse_module_flags(oh, np);
child = of_get_next_child(np, NULL);
if (child)
parse_module_flags(oh, child);
}
oh->_state = _HWMOD_STATE_INITIALIZED;
return 0 ;
}
/**
* _ setup_iclk_autoidle - configure an IP block ' s interface clocks
* @ oh : struct omap_hwmod *
*
* Set up the module ' s interface clocks . XXX This function is still mostly
* a stub ; implementing this properly requires iclk autoidle usecounting in
* the clock code . No return value .
*/
static void _setup_iclk_autoidle(struct omap_hwmod *oh)
{
struct omap_hwmod_ocp_if *os;
if (oh->_state != _HWMOD_STATE_INITIALIZED)
return ;
list_for_each_entry(os, &oh->slave_ports, node) {
if (!os->_clk)
continue ;
if (os->flags & OCPIF_SWSUP_IDLE) {
/*
* we might have multiple users of one iclk with
* different requirements , disable autoidle when
* the module is enabled , e . g . dss iclk
*/
} else {
/* we are enabling autoidle afterwards anyways */
clk_enable(os->_clk);
}
}
return ;
}
/**
* _ setup_reset - reset an IP block during the setup process
* @ oh : struct omap_hwmod *
*
* Reset the IP block corresponding to the hwmod @ oh during the setup
* process . The IP block is first enabled so it can be successfully
* reset . Returns 0 upon success or a negative error code upon
* failure .
*/
static int _setup_reset(struct omap_hwmod *oh)
{
int r = 0 ;
if (oh->_state != _HWMOD_STATE_INITIALIZED)
return -EINVAL;
if (oh->flags & HWMOD_EXT_OPT_MAIN_CLK)
return -EPERM;
if (oh->rst_lines_cnt == 0 ) {
r = _enable(oh);
if (r) {
pr_warn("omap_hwmod: %s: cannot be enabled for reset (%d)\n" ,
oh->name, oh->_state);
return -EINVAL;
}
}
if (!(oh->flags & HWMOD_INIT_NO_RESET))
r = _reset(oh);
return r;
}
/**
* _ setup_postsetup - transition to the appropriate state after _ setup
* @ oh : struct omap_hwmod *
*
* Place an IP block represented by @ oh into a " post - setup " state - -
* either IDLE , ENABLED , or DISABLED . ( " post - setup " simply means that
* this function is called at the end of _ setup ( ) . ) The postsetup
* state for an IP block can be changed by calling
* omap_hwmod_enter_postsetup_state ( ) early in the boot process ,
* before one of the omap_hwmod_setup * ( ) functions are called for the
* IP block .
*
* The IP block stays in this state until a PM runtime - based driver is
* loaded for that IP block . A post - setup state of IDLE is
* appropriate for almost all IP blocks with runtime PM - enabled
* drivers , since those drivers are able to enable the IP block . A
* post - setup state of ENABLED is appropriate for kernels with PM
* runtime disabled . The DISABLED state is appropriate for unusual IP
* blocks such as the MPU WDTIMER on kernels without WDTIMER drivers
* included , since the WDTIMER starts running on reset and will reset
* the MPU if left active .
*
* This post - setup mechanism is deprecated . Once all of the OMAP
* drivers have been converted to use PM runtime , and all of the IP
* block data and interconnect data is available to the hwmod code , it
* should be possible to replace this mechanism with a " lazy reset "
* arrangement . In a " lazy reset " setup , each IP block is enabled
* when the driver first probes , then all remaining IP blocks without
* drivers are either shut down or enabled after the drivers have
* loaded . However , this cannot take place until the above
* preconditions have been met , since otherwise the late reset code
* has no way of knowing which IP blocks are in use by drivers , and
* which ones are unused .
*
* No return value .
*/
static void _setup_postsetup(struct omap_hwmod *oh)
{
u8 postsetup_state;
if (oh->rst_lines_cnt > 0 )
return ;
postsetup_state = oh->_postsetup_state;
if (postsetup_state == _HWMOD_STATE_UNKNOWN)
postsetup_state = _HWMOD_STATE_ENABLED;
/*
* XXX HWMOD_INIT_NO_IDLE does not belong in hwmod data -
* it should be set by the core code as a runtime flag during startup
*/
if ((oh->flags & (HWMOD_INIT_NO_IDLE | HWMOD_NO_IDLE)) &&
(postsetup_state == _HWMOD_STATE_IDLE)) {
oh->_int_flags |= _HWMOD_SKIP_ENABLE;
postsetup_state = _HWMOD_STATE_ENABLED;
}
if (postsetup_state == _HWMOD_STATE_IDLE)
_idle(oh);
else if (postsetup_state == _HWMOD_STATE_DISABLED)
_shutdown(oh);
else if (postsetup_state != _HWMOD_STATE_ENABLED)
WARN(1 , "hwmod: %s: unknown postsetup state %d! defaulting to enabled\n" ,
oh->name, postsetup_state);
return ;
}
/**
* _ setup - prepare IP block hardware for use
* @ oh : struct omap_hwmod *
* @ data : ( unused , pass NULL )
*
* Configure the IP block represented by @ oh . This may include
* enabling the IP block , resetting it , and placing it into a
* post - setup state , depending on the type of IP block and applicable
* flags . IP blocks are reset to prevent any previous configuration
* by the bootloader or previous operating system from interfering
* with power management or other parts of the system . The reset can
* be avoided ; see omap_hwmod_no_setup_reset ( ) . This is the second of
* two phases for hwmod initialization . Code called here generally
* affects the IP block hardware , or system integration hardware
* associated with the IP block . Returns 0 .
*/
static int _setup(struct omap_hwmod *oh, void *data)
{
if (oh->_state != _HWMOD_STATE_INITIALIZED)
return 0 ;
if (oh->parent_hwmod) {
int r;
r = _enable(oh->parent_hwmod);
WARN(r, "hwmod: %s: setup: failed to enable parent hwmod %s\n" ,
oh->name, oh->parent_hwmod->name);
}
_setup_iclk_autoidle(oh);
if (!_setup_reset(oh))
_setup_postsetup(oh);
if (oh->parent_hwmod) {
u8 postsetup_state;
postsetup_state = oh->parent_hwmod->_postsetup_state;
if (postsetup_state == _HWMOD_STATE_IDLE)
_idle(oh->parent_hwmod);
else if (postsetup_state == _HWMOD_STATE_DISABLED)
_shutdown(oh->parent_hwmod);
else if (postsetup_state != _HWMOD_STATE_ENABLED)
WARN(1 , "hwmod: %s: unknown postsetup state %d! defaulting to enabled\n" ,
oh->parent_hwmod->name, postsetup_state);
}
return 0 ;
}
/**
* _ register - register a struct omap_hwmod
* @ oh : struct omap_hwmod *
*
* Registers the omap_hwmod @ oh . Returns - EEXIST if an omap_hwmod
* already has been registered by the same name ; - EINVAL if the
* omap_hwmod is in the wrong state , if @ oh is NULL , if the
* omap_hwmod ' s class field is NULL ; if the omap_hwmod is missing a
* name , or if the omap_hwmod ' s class is missing a name ; or 0 upon
* success .
*
* XXX The data should be copied into bootmem , so the original data
* should be marked _ _ initdata and freed after init . This would allow
* unneeded omap_hwmods to be freed on multi - OMAP configurations . Note
* that the copy process would be relatively complex due to the large number
* of substructures .
*/
static int _register (struct omap_hwmod *oh)
{
if (!oh || !oh->name || !oh->class || !oh->class ->name ||
(oh->_state != _HWMOD_STATE_UNKNOWN))
return -EINVAL;
pr_debug("omap_hwmod: %s: registering\n" , oh->name);
if (_lookup(oh->name))
return -EEXIST;
list_add_tail(&oh->node, &omap_hwmod_list);
INIT_LIST_HEAD(&oh->slave_ports);
spin_lock_init(&oh->_lock);
lockdep_set_class(&oh->_lock, &oh->hwmod_key);
oh->_state = _HWMOD_STATE_REGISTERED;
/*
* XXX Rather than doing a strcmp ( ) , this should test a flag
* set in the hwmod data , inserted by the autogenerator code .
*/
if (!strcmp(oh->name, MPU_INITIATOR_NAME))
mpu_oh = oh;
return 0 ;
}
/**
* _ add_link - add an interconnect between two IP blocks
* @ oi : pointer to a struct omap_hwmod_ocp_if record
*
* Add struct omap_hwmod_link records connecting the slave IP block
* specified in @ oi - > slave to @ oi . This code is assumed to run before
* preemption or SMP has been enabled , thus avoiding the need for
* locking in this code . Changes to this assumption will require
* additional locking . Returns 0 .
*/
static int _add_link(struct omap_hwmod_ocp_if *oi)
{
pr_debug("omap_hwmod: %s -> %s: adding link\n" , oi->master->name,
oi->slave->name);
list_add(&oi->node, &oi->slave->slave_ports);
oi->slave->slaves_cnt++;
return 0 ;
}
/**
* _ register_link - register a struct omap_hwmod_ocp_if
* @ oi : struct omap_hwmod_ocp_if *
*
* Registers the omap_hwmod_ocp_if record @ oi . Returns - EEXIST if it
* has already been registered ; - EINVAL if @ oi is NULL or if the
* record pointed to by @ oi is missing required fields ; or 0 upon
* success .
*
* XXX The data should be copied into bootmem , so the original data
* should be marked _ _ initdata and freed after init . This would allow
* unneeded omap_hwmods to be freed on multi - OMAP configurations .
*/
static int __init _register_link(struct omap_hwmod_ocp_if *oi)
{
if (!oi || !oi->master || !oi->slave || !oi->user)
return -EINVAL;
if (oi->_int_flags & _OCPIF_INT_FLAGS_REGISTERED)
return -EEXIST;
pr_debug("omap_hwmod: registering link from %s to %s\n" ,
oi->master->name, oi->slave->name);
/*
* Register the connected hwmods , if they haven ' t been
* registered already
*/
if (oi->master->_state != _HWMOD_STATE_REGISTERED)
_register (oi->master);
if (oi->slave->_state != _HWMOD_STATE_REGISTERED)
_register (oi->slave);
_add_link(oi);
oi->_int_flags |= _OCPIF_INT_FLAGS_REGISTERED;
return 0 ;
}
/* Static functions intended only for use in soc_ops field function pointers */
/**
* _ omap2xxx_3xxx_wait_target_ready - wait for a module to leave slave idle
* @ oh : struct omap_hwmod *
*
* Wait for a module @ oh to leave slave idle . Returns 0 if the module
* does not have an IDLEST bit or if the module successfully leaves
* slave idle ; otherwise , pass along the return value of the
* appropriate * _ cm * _ wait_module_ready ( ) function .
*/
static int _omap2xxx_3xxx_wait_target_ready(struct omap_hwmod *oh)
{
if (!oh)
return -EINVAL;
if (oh->flags & HWMOD_NO_IDLEST)
return 0 ;
if (!_find_mpu_rt_port(oh))
return 0 ;
/* XXX check module SIDLEMODE, hardreset status, enabled clocks */
return omap_cm_wait_module_ready(0 , oh->prcm.omap2.module_offs,
oh->prcm.omap2.idlest_reg_id,
oh->prcm.omap2.idlest_idle_bit);
}
/**
* _ omap4_wait_target_ready - wait for a module to leave slave idle
* @ oh : struct omap_hwmod *
*
* Wait for a module @ oh to leave slave idle . Returns 0 if the module
* does not have an IDLEST bit or if the module successfully leaves
* slave idle ; otherwise , pass along the return value of the
* appropriate * _ cm * _ wait_module_ready ( ) function .
*/
static int _omap4_wait_target_ready(struct omap_hwmod *oh)
{
if (!oh)
return -EINVAL;
if (oh->flags & HWMOD_NO_IDLEST || !oh->clkdm)
return 0 ;
if (!_find_mpu_rt_port(oh))
return 0 ;
if (_omap4_clkctrl_managed_by_clkfwk(oh))
return 0 ;
if (!_omap4_has_clkctrl_clock(oh))
return 0 ;
/* XXX check module SIDLEMODE, hardreset status */
return omap_cm_wait_module_ready(oh->clkdm->prcm_partition,
oh->clkdm->cm_inst,
oh->prcm.omap4.clkctrl_offs, 0 );
}
/**
* _ omap2_assert_hardreset - call OMAP2 PRM hardreset fn with hwmod args
* @ oh : struct omap_hwmod * to assert hardreset
* @ ohri : hardreset line data
*
* Call omap2_prm_assert_hardreset ( ) with parameters extracted from
* the hwmod @ oh and the hardreset line data @ ohri . Only intended for
* use as an soc_ops function pointer . Passes along the return value
* from omap2_prm_assert_hardreset ( ) . XXX This function is scheduled
* for removal when the PRM code is moved into drivers / .
*/
static int _omap2_assert_hardreset(struct omap_hwmod *oh,
struct omap_hwmod_rst_info *ohri)
{
return omap_prm_assert_hardreset(ohri->rst_shift, 0 ,
oh->prcm.omap2.module_offs, 0 );
}
/**
* _ omap2_deassert_hardreset - call OMAP2 PRM hardreset fn with hwmod args
* @ oh : struct omap_hwmod * to deassert hardreset
* @ ohri : hardreset line data
*
* Call omap2_prm_deassert_hardreset ( ) with parameters extracted from
* the hwmod @ oh and the hardreset line data @ ohri . Only intended for
* use as an soc_ops function pointer . Passes along the return value
* from omap2_prm_deassert_hardreset ( ) . XXX This function is
* scheduled for removal when the PRM code is moved into drivers / .
*/
static int _omap2_deassert_hardreset(struct omap_hwmod *oh,
struct omap_hwmod_rst_info *ohri)
{
return omap_prm_deassert_hardreset(ohri->rst_shift, ohri->st_shift, 0 ,
oh->prcm.omap2.module_offs, 0 , 0 );
}
/**
* _ omap2_is_hardreset_asserted - call OMAP2 PRM hardreset fn with hwmod args
* @ oh : struct omap_hwmod * to test hardreset
* @ ohri : hardreset line data
*
* Call omap2_prm_is_hardreset_asserted ( ) with parameters extracted
* from the hwmod @ oh and the hardreset line data @ ohri . Only
* intended for use as an soc_ops function pointer . Passes along the
* return value from omap2_prm_is_hardreset_asserted ( ) . XXX This
* function is scheduled for removal when the PRM code is moved into
* drivers / .
*/
static int _omap2_is_hardreset_asserted(struct omap_hwmod *oh,
struct omap_hwmod_rst_info *ohri)
{
return omap_prm_is_hardreset_asserted(ohri->st_shift, 0 ,
oh->prcm.omap2.module_offs, 0 );
}
/**
* _ omap4_assert_hardreset - call OMAP4 PRM hardreset fn with hwmod args
* @ oh : struct omap_hwmod * to assert hardreset
* @ ohri : hardreset line data
*
* Call omap4_prminst_assert_hardreset ( ) with parameters extracted
* from the hwmod @ oh and the hardreset line data @ ohri . Only
* intended for use as an soc_ops function pointer . Passes along the
* return value from omap4_prminst_assert_hardreset ( ) . XXX This
* function is scheduled for removal when the PRM code is moved into
* drivers / .
*/
static int _omap4_assert_hardreset(struct omap_hwmod *oh,
struct omap_hwmod_rst_info *ohri)
{
if (!oh->clkdm)
return -EINVAL;
return omap_prm_assert_hardreset(ohri->rst_shift,
oh->clkdm->pwrdm.ptr->prcm_partition,
oh->clkdm->pwrdm.ptr->prcm_offs,
oh->prcm.omap4.rstctrl_offs);
}
/**
* _ omap4_deassert_hardreset - call OMAP4 PRM hardreset fn with hwmod args
* @ oh : struct omap_hwmod * to deassert hardreset
* @ ohri : hardreset line data
*
* Call omap4_prminst_deassert_hardreset ( ) with parameters extracted
* from the hwmod @ oh and the hardreset line data @ ohri . Only
* intended for use as an soc_ops function pointer . Passes along the
* return value from omap4_prminst_deassert_hardreset ( ) . XXX This
* function is scheduled for removal when the PRM code is moved into
* drivers / .
*/
static int _omap4_deassert_hardreset(struct omap_hwmod *oh,
struct omap_hwmod_rst_info *ohri)
{
if (!oh->clkdm)
return -EINVAL;
if (ohri->st_shift)
pr_err("omap_hwmod: %s: %s: hwmod data error: OMAP4 does not support st_shift\n" ,
oh->name, ohri->name);
return omap_prm_deassert_hardreset(ohri->rst_shift, ohri->rst_shift,
oh->clkdm->pwrdm.ptr->prcm_partition,
oh->clkdm->pwrdm.ptr->prcm_offs,
oh->prcm.omap4.rstctrl_offs,
oh->prcm.omap4.rstctrl_offs +
OMAP4_RST_CTRL_ST_OFFSET);
}
/**
* _ omap4_is_hardreset_asserted - call OMAP4 PRM hardreset fn with hwmod args
* @ oh : struct omap_hwmod * to test hardreset
* @ ohri : hardreset line data
*
* Call omap4_prminst_is_hardreset_asserted ( ) with parameters
* extracted from the hwmod @ oh and the hardreset line data @ ohri .
* Only intended for use as an soc_ops function pointer . Passes along
* the return value from omap4_prminst_is_hardreset_asserted ( ) . XXX
* This function is scheduled for removal when the PRM code is moved
* into drivers / .
*/
static int _omap4_is_hardreset_asserted(struct omap_hwmod *oh,
struct omap_hwmod_rst_info *ohri)
{
if (!oh->clkdm)
return -EINVAL;
return omap_prm_is_hardreset_asserted(ohri->rst_shift,
oh->clkdm->pwrdm.ptr->
prcm_partition,
oh->clkdm->pwrdm.ptr->prcm_offs,
oh->prcm.omap4.rstctrl_offs);
}
/**
* _ omap4_disable_direct_prcm - disable direct PRCM control for hwmod
* @ oh : struct omap_hwmod * to disable control for
*
* Disables direct PRCM clkctrl done by hwmod core . Instead , the hwmod
* will be using its main_clk to enable / disable the module . Returns
* 0 if successful .
*/
static int _omap4_disable_direct_prcm(struct omap_hwmod *oh)
{
if (!oh)
return -EINVAL;
oh->prcm.omap4.flags |= HWMOD_OMAP4_CLKFWK_CLKCTR_CLOCK;
return 0 ;
}
/**
* _ am33xx_deassert_hardreset - call AM33XX PRM hardreset fn with hwmod args
* @ oh : struct omap_hwmod * to deassert hardreset
* @ ohri : hardreset line data
*
* Call am33xx_prminst_deassert_hardreset ( ) with parameters extracted
* from the hwmod @ oh and the hardreset line data @ ohri . Only
* intended for use as an soc_ops function pointer . Passes along the
* return value from am33xx_prminst_deassert_hardreset ( ) . XXX This
* function is scheduled for removal when the PRM code is moved into
* drivers / .
*/
static int _am33xx_deassert_hardreset(struct omap_hwmod *oh,
struct omap_hwmod_rst_info *ohri)
{
return omap_prm_deassert_hardreset(ohri->rst_shift, ohri->st_shift,
oh->clkdm->pwrdm.ptr->prcm_partition,
oh->clkdm->pwrdm.ptr->prcm_offs,
oh->prcm.omap4.rstctrl_offs,
oh->prcm.omap4.rstst_offs);
}
/* Public functions */
u32 omap_hwmod_read(struct omap_hwmod *oh, u16 reg_offs)
{
if (oh->flags & HWMOD_16BIT_REG)
return readw_relaxed(oh->_mpu_rt_va + reg_offs);
else
return readl_relaxed(oh->_mpu_rt_va + reg_offs);
}
void omap_hwmod_write(u32 v, struct omap_hwmod *oh, u16 reg_offs)
{
if (oh->flags & HWMOD_16BIT_REG)
writew_relaxed(v, oh->_mpu_rt_va + reg_offs);
else
writel_relaxed(v, oh->_mpu_rt_va + reg_offs);
}
/**
* omap_hwmod_softreset - reset a module via SYSCONFIG . SOFTRESET bit
* @ oh : struct omap_hwmod *
*
* This is a public function exposed to drivers . Some drivers may need to do
* some settings before and after resetting the device . Those drivers after
* doing the necessary settings could use this function to start a reset by
* setting the SYSCONFIG . SOFTRESET bit .
*/
int omap_hwmod_softreset(struct omap_hwmod *oh)
{
u32 v;
int ret;
if (!oh || !(oh->_sysc_cache))
return -EINVAL;
v = oh->_sysc_cache;
ret = _set_softreset(oh, &v);
if (ret)
goto error;
_write_sysconfig(v, oh);
ret = _clear_softreset(oh, &v);
if (ret)
goto error;
_write_sysconfig(v, oh);
error:
return ret;
}
/**
* omap_hwmod_lookup - look up a registered omap_hwmod by name
* @ name : name of the omap_hwmod to look up
*
* Given a @ name of an omap_hwmod , return a pointer to the registered
* struct omap_hwmod * , or NULL upon error .
*/
struct omap_hwmod *omap_hwmod_lookup(const char *name)
{
struct omap_hwmod *oh;
if (!name)
return NULL;
oh = _lookup(name);
return oh;
}
/**
* omap_hwmod_for_each - call function for each registered omap_hwmod
* @ fn : pointer to a callback function
* @ data : void * data to pass to callback function
*
* Call @ fn for each registered omap_hwmod , passing @ data to each
* function . @ fn must return 0 for success or any other value for
* failure . If @ fn returns non - zero , the iteration across omap_hwmods
* will stop and the non - zero return value will be passed to the
* caller of omap_hwmod_for_each ( ) . @ fn is called with
* omap_hwmod_for_each ( ) held .
*/
int omap_hwmod_for_each(int (*fn)(struct omap_hwmod *oh, void *data),
void *data)
{
struct omap_hwmod *temp_oh;
int ret = 0 ;
if (!fn)
return -EINVAL;
list_for_each_entry(temp_oh, &omap_hwmod_list, node) {
ret = (*fn)(temp_oh, data);
if (ret)
break ;
}
return ret;
}
/**
* omap_hwmod_register_links - register an array of hwmod links
* @ ois : pointer to an array of omap_hwmod_ocp_if to register
*
* Intended to be called early in boot before the clock framework is
* initialized . If @ ois is not null , will register all omap_hwmods
* listed in @ ois that are valid for this chip . Returns - EINVAL if
* omap_hwmod_init ( ) hasn ' t been called before calling this function ,
* - ENOMEM if the link memory area can ' t be allocated , or 0 upon
* success .
*/
int __init omap_hwmod_register_links(struct omap_hwmod_ocp_if **ois)
{
int r, i;
if (!inited)
return -EINVAL;
if (!ois)
return 0 ;
if (ois[0 ] == NULL) /* Empty list */
return 0 ;
i = 0 ;
do {
r = _register_link(ois[i]);
WARN(r && r != -EEXIST,
"omap_hwmod: _register_link(%s -> %s) returned %d\n" ,
ois[i]->master->name, ois[i]->slave->name, r);
} while (ois[++i]);
return 0 ;
}
static int __init omap_hwmod_setup_one(const char *oh_name);
/**
* _ ensure_mpu_hwmod_is_setup - ensure the MPU SS hwmod is init ' ed and set up
* @ oh : pointer to the hwmod currently being set up ( usually not the MPU )
*
* If the hwmod data corresponding to the MPU subsystem IP block
* hasn ' t been initialized and set up yet , do so now . This must be
* done first since sleep dependencies may be added from other hwmods
* to the MPU . Intended to be called only by omap_hwmod_setup * ( ) . No
* return value .
*/
static void __init _ensure_mpu_hwmod_is_setup(struct omap_hwmod *oh)
{
if (!mpu_oh || mpu_oh->_state == _HWMOD_STATE_UNKNOWN)
pr_err("omap_hwmod: %s: MPU initiator hwmod %s not yet registered\n" ,
__func__, MPU_INITIATOR_NAME);
else if (mpu_oh->_state == _HWMOD_STATE_REGISTERED && oh != mpu_oh)
omap_hwmod_setup_one(MPU_INITIATOR_NAME);
}
/**
* omap_hwmod_setup_one - set up a single hwmod
* @ oh_name : const char * name of the already - registered hwmod to set up
*
* Initialize and set up a single hwmod . Intended to be used for a
* small number of early devices , such as the timer IP blocks used for
* the scheduler clock . Must be called after omap2_clk_init ( ) .
* Resolves the struct clk names to struct clk pointers for each
* registered omap_hwmod . Also calls _ setup ( ) on each hwmod . Returns
* - EINVAL upon error or 0 upon success .
*/
static int __init omap_hwmod_setup_one(const char *oh_name)
{
struct omap_hwmod *oh;
pr_debug("omap_hwmod: %s: %s\n" , oh_name, __func__);
oh = _lookup(oh_name);
if (!oh) {
WARN(1 , "omap_hwmod: %s: hwmod not yet registered\n" , oh_name);
return -EINVAL;
}
_ensure_mpu_hwmod_is_setup(oh);
_init(oh, NULL);
_setup(oh, NULL);
return 0 ;
}
static void omap_hwmod_check_one(struct device *dev,
const char *name, s8 v1, u8 v2)
{
if (v1 < 0 )
return ;
if (v1 != v2)
dev_warn(dev, "%s %d != %d\n" , name, v1, v2);
}
/**
* omap_hwmod_check_sysc - check sysc against platform sysc
* @ dev : struct device
* @ data : module data
* @ sysc_fields : new sysc configuration
*/
static int omap_hwmod_check_sysc(struct device *dev,
const struct ti_sysc_module_data *data,
struct sysc_regbits *sysc_fields)
{
const struct sysc_regbits *regbits = data->cap->regbits;
omap_hwmod_check_one(dev, "dmadisable_shift" ,
regbits->dmadisable_shift,
sysc_fields->dmadisable_shift);
omap_hwmod_check_one(dev, "midle_shift" ,
regbits->midle_shift,
sysc_fields->midle_shift);
omap_hwmod_check_one(dev, "sidle_shift" ,
regbits->sidle_shift,
sysc_fields->sidle_shift);
omap_hwmod_check_one(dev, "clkact_shift" ,
regbits->clkact_shift,
sysc_fields->clkact_shift);
omap_hwmod_check_one(dev, "enwkup_shift" ,
regbits->enwkup_shift,
sysc_fields->enwkup_shift);
omap_hwmod_check_one(dev, "srst_shift" ,
regbits->srst_shift,
sysc_fields->srst_shift);
omap_hwmod_check_one(dev, "autoidle_shift" ,
regbits->autoidle_shift,
sysc_fields->autoidle_shift);
return 0 ;
}
/**
* omap_hwmod_init_regbits - init sysconfig specific register bits
* @ dev : struct device
* @ oh : module
* @ data : module data
* @ sysc_fields : new sysc configuration
*/
static int omap_hwmod_init_regbits(struct device *dev, struct omap_hwmod *oh,
const struct ti_sysc_module_data *data,
struct sysc_regbits **sysc_fields)
{
switch (data->cap->type) {
case TI_SYSC_OMAP2:
case TI_SYSC_OMAP2_TIMER:
*sysc_fields = &omap_hwmod_sysc_type1;
break ;
case TI_SYSC_OMAP3_SHAM:
*sysc_fields = &omap3_sham_sysc_fields;
break ;
case TI_SYSC_OMAP3_AES:
*sysc_fields = &omap3xxx_aes_sysc_fields;
break ;
case TI_SYSC_OMAP4:
case TI_SYSC_OMAP4_TIMER:
*sysc_fields = &omap_hwmod_sysc_type2;
break ;
case TI_SYSC_OMAP4_SIMPLE:
*sysc_fields = &omap_hwmod_sysc_type3;
break ;
case TI_SYSC_OMAP34XX_SR:
*sysc_fields = &omap34xx_sr_sysc_fields;
break ;
case TI_SYSC_OMAP36XX_SR:
*sysc_fields = &omap36xx_sr_sysc_fields;
break ;
case TI_SYSC_OMAP4_SR:
*sysc_fields = &omap36xx_sr_sysc_fields;
break ;
case TI_SYSC_OMAP4_MCASP:
*sysc_fields = &omap_hwmod_sysc_type_mcasp;
break ;
case TI_SYSC_OMAP4_USB_HOST_FS:
*sysc_fields = &omap_hwmod_sysc_type_usb_host_fs;
break ;
default :
*sysc_fields = NULL;
if (!oh->class ->sysc->sysc_fields)
return 0 ;
dev_err(dev, "sysc_fields not found\n" );
return -EINVAL;
}
return omap_hwmod_check_sysc(dev, data, *sysc_fields);
}
/**
* omap_hwmod_init_reg_offs - initialize sysconfig register offsets
* @ dev : struct device
* @ data : module data
* @ rev_offs : revision register offset
* @ sysc_offs : sysc register offset
* @ syss_offs : syss register offset
*/
static int omap_hwmod_init_reg_offs(struct device *dev,
const struct ti_sysc_module_data *data,
s32 *rev_offs, s32 *sysc_offs,
s32 *syss_offs)
{
*rev_offs = -ENODEV;
*sysc_offs = 0 ;
*syss_offs = 0 ;
if (data->offsets[SYSC_REVISION] >= 0 )
*rev_offs = data->offsets[SYSC_REVISION];
if (data->offsets[SYSC_SYSCONFIG] >= 0 )
*sysc_offs = data->offsets[SYSC_SYSCONFIG];
if (data->offsets[SYSC_SYSSTATUS] >= 0 )
*syss_offs = data->offsets[SYSC_SYSSTATUS];
return 0 ;
}
/**
* omap_hwmod_init_sysc_flags - initialize sysconfig features
* @ dev : struct device
* @ data : module data
* @ sysc_flags : module configuration
*/
static int omap_hwmod_init_sysc_flags(struct device *dev,
const struct ti_sysc_module_data *data,
u32 *sysc_flags)
{
*sysc_flags = 0 ;
switch (data->cap->type) {
case TI_SYSC_OMAP2:
case TI_SYSC_OMAP2_TIMER:
/* See SYSC_OMAP2_* in include/dt-bindings/bus/ti-sysc.h */
if (data->cfg->sysc_val & SYSC_OMAP2_CLOCKACTIVITY)
*sysc_flags |= SYSC_HAS_CLOCKACTIVITY;
if (data->cfg->sysc_val & SYSC_OMAP2_EMUFREE)
*sysc_flags |= SYSC_HAS_EMUFREE;
if (data->cfg->sysc_val & SYSC_OMAP2_ENAWAKEUP)
*sysc_flags |= SYSC_HAS_ENAWAKEUP;
if (data->cfg->sysc_val & SYSC_OMAP2_SOFTRESET)
*sysc_flags |= SYSC_HAS_SOFTRESET;
if (data->cfg->sysc_val & SYSC_OMAP2_AUTOIDLE)
*sysc_flags |= SYSC_HAS_AUTOIDLE;
break ;
case TI_SYSC_OMAP4:
case TI_SYSC_OMAP4_TIMER:
/* See SYSC_OMAP4_* in include/dt-bindings/bus/ti-sysc.h */
if (data->cfg->sysc_val & SYSC_OMAP4_DMADISABLE)
*sysc_flags |= SYSC_HAS_DMADISABLE;
if (data->cfg->sysc_val & SYSC_OMAP4_FREEEMU)
*sysc_flags |= SYSC_HAS_EMUFREE;
if (data->cfg->sysc_val & SYSC_OMAP4_SOFTRESET)
*sysc_flags |= SYSC_HAS_SOFTRESET;
break ;
case TI_SYSC_OMAP34XX_SR:
case TI_SYSC_OMAP36XX_SR:
/* See SYSC_OMAP3_SR_* in include/dt-bindings/bus/ti-sysc.h */
if (data->cfg->sysc_val & SYSC_OMAP3_SR_ENAWAKEUP)
*sysc_flags |= SYSC_HAS_ENAWAKEUP;
break ;
default :
if (data->cap->regbits->emufree_shift >= 0 )
*sysc_flags |= SYSC_HAS_EMUFREE;
if (data->cap->regbits->enwkup_shift >= 0 )
*sysc_flags |= SYSC_HAS_ENAWAKEUP;
if (data->cap->regbits->srst_shift >= 0 )
*sysc_flags |= SYSC_HAS_SOFTRESET;
if (data->cap->regbits->autoidle_shift >= 0 )
*sysc_flags |= SYSC_HAS_AUTOIDLE;
break ;
}
if (data->cap->regbits->midle_shift >= 0 &&
data->cfg->midlemodes)
*sysc_flags |= SYSC_HAS_MIDLEMODE;
if (data->cap->regbits->sidle_shift >= 0 &&
data->cfg->sidlemodes)
*sysc_flags |= SYSC_HAS_SIDLEMODE;
if (data->cfg->quirks & SYSC_QUIRK_UNCACHED)
*sysc_flags |= SYSC_NO_CACHE;
if (data->cfg->quirks & SYSC_QUIRK_RESET_STATUS)
*sysc_flags |= SYSC_HAS_RESET_STATUS;
if (data->cfg->syss_mask & 1 )
*sysc_flags |= SYSS_HAS_RESET_STATUS;
return 0 ;
}
/**
* omap_hwmod_init_idlemodes - initialize module idle modes
* @ dev : struct device
* @ data : module data
* @ idlemodes : module supported idle modes
*/
static int omap_hwmod_init_idlemodes(struct device *dev,
const struct ti_sysc_module_data *data,
u32 *idlemodes)
{
*idlemodes = 0 ;
if (data->cfg->midlemodes & BIT(SYSC_IDLE_FORCE))
*idlemodes |= MSTANDBY_FORCE;
if (data->cfg->midlemodes & BIT(SYSC_IDLE_NO))
*idlemodes |= MSTANDBY_NO;
if (data->cfg->midlemodes & BIT(SYSC_IDLE_SMART))
*idlemodes |= MSTANDBY_SMART;
if (data->cfg->midlemodes & BIT(SYSC_IDLE_SMART_WKUP))
*idlemodes |= MSTANDBY_SMART_WKUP;
if (data->cfg->sidlemodes & BIT(SYSC_IDLE_FORCE))
*idlemodes |= SIDLE_FORCE;
if (data->cfg->sidlemodes & BIT(SYSC_IDLE_NO))
*idlemodes |= SIDLE_NO;
if (data->cfg->sidlemodes & BIT(SYSC_IDLE_SMART))
*idlemodes |= SIDLE_SMART;
if (data->cfg->sidlemodes & BIT(SYSC_IDLE_SMART_WKUP))
*idlemodes |= SIDLE_SMART_WKUP;
return 0 ;
}
/**
* omap_hwmod_check_module - check new module against platform data
* @ dev : struct device
* @ oh : module
* @ data : new module data
* @ sysc_fields : sysc register bits
* @ rev_offs : revision register offset
* @ sysc_offs : sysconfig register offset
* @ syss_offs : sysstatus register offset
* @ sysc_flags : sysc specific flags
* @ idlemodes : sysc supported idlemodes
*/
static int omap_hwmod_check_module(struct device *dev,
struct omap_hwmod *oh,
const struct ti_sysc_module_data *data,
struct sysc_regbits *sysc_fields,
s32 rev_offs, s32 sysc_offs,
s32 syss_offs, u32 sysc_flags,
u32 idlemodes)
{
if (!oh->class ->sysc)
return -ENODEV;
if (oh->class ->sysc->sysc_fields &&
sysc_fields != oh->class ->sysc->sysc_fields)
dev_warn(dev, "sysc_fields mismatch\n" );
if (rev_offs != oh->class ->sysc->rev_offs)
dev_warn(dev, "rev_offs %08x != %08x\n" , rev_offs,
oh->class ->sysc->rev_offs);
if (sysc_offs != oh->class ->sysc->sysc_offs)
dev_warn(dev, "sysc_offs %08x != %08x\n" , sysc_offs,
oh->class ->sysc->sysc_offs);
if (syss_offs != oh->class ->sysc->syss_offs)
dev_warn(dev, "syss_offs %08x != %08x\n" , syss_offs,
oh->class ->sysc->syss_offs);
if (sysc_flags != oh->class ->sysc->sysc_flags)
dev_warn(dev, "sysc_flags %08x != %08x\n" , sysc_flags,
oh->class ->sysc->sysc_flags);
if (idlemodes != oh->class ->sysc->idlemodes)
dev_warn(dev, "idlemodes %08x != %08x\n" , idlemodes,
oh->class ->sysc->idlemodes);
if (data->cfg->srst_udelay != oh->class ->sysc->srst_udelay)
dev_warn(dev, "srst_udelay %i != %i\n" ,
data->cfg->srst_udelay,
oh->class ->sysc->srst_udelay);
return 0 ;
}
/**
* omap_hwmod_allocate_module - allocate new module
* @ dev : struct device
* @ oh : module
* @ data : module data
* @ sysc_fields : sysc register bits
* @ clkdm : clockdomain
* @ rev_offs : revision register offset
* @ sysc_offs : sysconfig register offset
* @ syss_offs : sysstatus register offset
* @ sysc_flags : sysc specific flags
* @ idlemodes : sysc supported idlemodes
*
* Note that the allocations here cannot use devm as ti - sysc can rebind .
*/
static int omap_hwmod_allocate_module(struct device *dev, struct omap_hwmod *oh,
const struct ti_sysc_module_data *data,
struct sysc_regbits *sysc_fields,
struct clockdomain *clkdm,
s32 rev_offs, s32 sysc_offs,
s32 syss_offs, u32 sysc_flags,
u32 idlemodes)
{
struct omap_hwmod_class_sysconfig *sysc;
struct omap_hwmod_class *class = NULL;
struct omap_hwmod_ocp_if *oi = NULL;
void __iomem *regs = NULL;
unsigned long flags;
sysc = kzalloc(sizeof (*sysc), GFP_KERNEL);
if (!sysc)
return -ENOMEM;
sysc->sysc_fields = sysc_fields;
sysc->rev_offs = rev_offs;
sysc->sysc_offs = sysc_offs;
sysc->syss_offs = syss_offs;
sysc->sysc_flags = sysc_flags;
sysc->idlemodes = idlemodes;
sysc->srst_udelay = data->cfg->srst_udelay;
if (!oh->_mpu_rt_va) {
regs = ioremap(data->module_pa,
data->module_size);
if (!regs)
goto out_free_sysc;
}
/*
* We may need a new oh - > class as the other devices in the same class
* may not yet have ioremapped their registers .
*/
if (oh->class ->name && strcmp(oh->class ->name, data->name)) {
class = kmemdup(oh->class , sizeof (*oh->class ), GFP_KERNEL);
if (!class )
goto out_unmap;
}
if (list_empty(&oh->slave_ports)) {
oi = kzalloc(sizeof (*oi), GFP_KERNEL);
if (!oi)
goto out_free_class;
/*
* Note that we assume interconnect interface clocks will be
* managed by the interconnect driver for OCPIF_SWSUP_IDLE case
* on omap24xx and omap3 .
*/
oi->slave = oh;
oi->user = OCP_USER_MPU | OCP_USER_SDMA;
}
spin_lock_irqsave(&oh->_lock, flags);
if (regs)
oh->_mpu_rt_va = regs;
if (class )
oh->class = class ;
oh->class ->sysc = sysc;
if (oi)
_add_link(oi);
if (clkdm)
oh->clkdm = clkdm;
oh->_state = _HWMOD_STATE_INITIALIZED;
oh->_postsetup_state = _HWMOD_STATE_DEFAULT;
_setup(oh, NULL);
spin_unlock_irqrestore(&oh->_lock, flags);
return 0 ;
out_free_class:
kfree(class );
out_unmap:
iounmap(regs);
out_free_sysc:
kfree(sysc);
return -ENOMEM;
}
static const struct omap_hwmod_reset omap24xx_reset_quirks[] = {
{ .match = "msdi" , .len = 4 , .reset = omap_msdi_reset, },
};
static const struct omap_hwmod_reset omap_reset_quirks[] = {
{ .match = "dss_core" , .len = 8 , .reset = omap_dss_reset, },
{ .match = "hdq1w" , .len = 5 , .reset = omap_hdq1w_reset, },
{ .match = "i2c" , .len = 3 , .reset = omap_i2c_reset, },
{ .match = "wd_timer" , .len = 8 , .reset = omap2_wd_timer_reset, },
};
static void
omap_hwmod_init_reset_quirk(struct device *dev, struct omap_hwmod *oh,
const struct ti_sysc_module_data *data,
const struct omap_hwmod_reset *quirks,
int quirks_sz)
{
const struct omap_hwmod_reset *quirk;
int i;
for (i = 0 ; i < quirks_sz; i++) {
quirk = &quirks[i];
if (!strncmp(data->name, quirk->match, quirk->len)) {
oh->class ->reset = quirk->reset;
return ;
}
}
}
static void
omap_hwmod_init_reset_quirks(struct device *dev, struct omap_hwmod *oh,
const struct ti_sysc_module_data *data)
{
if (soc_is_omap24xx())
omap_hwmod_init_reset_quirk(dev, oh, data,
omap24xx_reset_quirks,
ARRAY_SIZE(omap24xx_reset_quirks));
omap_hwmod_init_reset_quirk(dev, oh, data, omap_reset_quirks,
ARRAY_SIZE(omap_reset_quirks));
}
/**
* omap_hwmod_init_module - initialize new module
* @ dev : struct device
* @ data : module data
* @ cookie : cookie for the caller to use for later calls
*/
int omap_hwmod_init_module(struct device *dev,
const struct ti_sysc_module_data *data,
struct ti_sysc_cookie *cookie)
{
struct omap_hwmod *oh;
struct sysc_regbits *sysc_fields;
s32 rev_offs, sysc_offs, syss_offs;
u32 sysc_flags, idlemodes;
int error;
if (!dev || !data || !data->name || !cookie)
return -EINVAL;
oh = _lookup(data->name);
if (!oh) {
oh = kzalloc(sizeof (*oh), GFP_KERNEL);
if (!oh)
return -ENOMEM;
oh->name = data->name;
oh->_state = _HWMOD_STATE_UNKNOWN;
lockdep_register_key(&oh->hwmod_key);
/* Unused, can be handled by PRM driver handling resets */
oh->prcm.omap4.flags = HWMOD_OMAP4_NO_CONTEXT_LOSS_BIT;
oh->class = kzalloc(sizeof (*oh->class ), GFP_KERNEL);
if (!oh->class ) {
kfree(oh);
return -ENOMEM;
}
omap_hwmod_init_reset_quirks(dev, oh, data);
oh->class ->name = data->name;
mutex_lock(&list_lock);
error = _register (oh);
mutex_unlock(&list_lock);
}
cookie->data = oh;
error = omap_hwmod_init_regbits(dev, oh, data, &sysc_fields);
if (error)
return error;
error = omap_hwmod_init_reg_offs(dev, data, &rev_offs,
&sysc_offs, &syss_offs);
if (error)
return error;
error = omap_hwmod_init_sysc_flags(dev, data, &sysc_flags);
if (error)
return error;
error = omap_hwmod_init_idlemodes(dev, data, &idlemodes);
if (error)
return error;
if (data->cfg->quirks & SYSC_QUIRK_NO_IDLE)
oh->flags |= HWMOD_NO_IDLE;
if (data->cfg->quirks & SYSC_QUIRK_NO_IDLE_ON_INIT)
oh->flags |= HWMOD_INIT_NO_IDLE;
if (data->cfg->quirks & SYSC_QUIRK_NO_RESET_ON_INIT)
oh->flags |= HWMOD_INIT_NO_RESET;
if (data->cfg->quirks & SYSC_QUIRK_USE_CLOCKACT)
oh->flags |= HWMOD_SET_DEFAULT_CLOCKACT;
if (data->cfg->quirks & SYSC_QUIRK_SWSUP_SIDLE)
oh->flags |= HWMOD_SWSUP_SIDLE;
if (data->cfg->quirks & SYSC_QUIRK_SWSUP_SIDLE_ACT)
oh->flags |= HWMOD_SWSUP_SIDLE_ACT;
if (data->cfg->quirks & SYSC_QUIRK_SWSUP_MSTANDBY)
oh->flags |= HWMOD_SWSUP_MSTANDBY;
if (data->cfg->quirks & SYSC_QUIRK_CLKDM_NOAUTO)
oh->flags |= HWMOD_CLKDM_NOAUTO;
error = omap_hwmod_check_module(dev, oh, data, sysc_fields,
rev_offs, sysc_offs, syss_offs,
sysc_flags, idlemodes);
if (!error)
return error;
return omap_hwmod_allocate_module(dev, oh, data, sysc_fields,
cookie->clkdm, rev_offs,
sysc_offs, syss_offs,
sysc_flags, idlemodes);
}
/**
* omap_hwmod_setup_earlycon_flags - set up flags for early console
*
* Enable DEBUG_OMAPUART_FLAGS for uart hwmod that is being used as
* early concole so that hwmod core doesn ' t reset and keep it in idle
* that specific uart .
*/
#ifdef CONFIG_SERIAL_EARLYCON
static void __init omap_hwmod_setup_earlycon_flags(void )
{
struct device_node *np;
struct omap_hwmod *oh;
const char *uart;
np = of_find_node_by_path("/chosen" );
if (np) {
uart = of_get_property(np, "stdout-path" , NULL);
if (uart) {
np = of_find_node_by_path(uart);
if (np) {
uart = of_get_property(np, "ti,hwmods" , NULL);
oh = omap_hwmod_lookup(uart);
if (!oh) {
uart = of_get_property(np->parent,
"ti,hwmods" ,
NULL);
oh = omap_hwmod_lookup(uart);
}
if (oh)
oh->flags |= DEBUG_OMAPUART_FLAGS;
}
}
}
}
#endif
/**
* omap_hwmod_setup_all - set up all registered IP blocks
*
* Initialize and set up all IP blocks registered with the hwmod code .
* Must be called after omap2_clk_init ( ) . Resolves the struct clk
* names to struct clk pointers for each registered omap_hwmod . Also
* calls _ setup ( ) on each hwmod . Returns 0 upon success .
*/
static int __init omap_hwmod_setup_all(void )
{
if (!inited)
return 0 ;
_ensure_mpu_hwmod_is_setup(NULL);
omap_hwmod_for_each(_init, NULL);
#ifdef CONFIG_SERIAL_EARLYCON
omap_hwmod_setup_earlycon_flags();
#endif
omap_hwmod_for_each(_setup, NULL);
return 0 ;
}
omap_postcore_initcall(omap_hwmod_setup_all);
/**
* omap_hwmod_enable - enable an omap_hwmod
* @ oh : struct omap_hwmod *
*
* Enable an omap_hwmod @ oh . Intended to be called by omap_device_enable ( ) .
* Returns - EINVAL on error or passes along the return value from _ enable ( ) .
*/
int omap_hwmod_enable(struct omap_hwmod *oh)
{
int r;
unsigned long flags;
if (!oh)
return -EINVAL;
spin_lock_irqsave(&oh->_lock, flags);
r = _enable(oh);
spin_unlock_irqrestore(&oh->_lock, flags);
return r;
}
/**
* omap_hwmod_idle - idle an omap_hwmod
* @ oh : struct omap_hwmod *
*
* Idle an omap_hwmod @ oh . Intended to be called by omap_device_idle ( ) .
* Returns - EINVAL on error or passes along the return value from _ idle ( ) .
*/
int omap_hwmod_idle(struct omap_hwmod *oh)
{
int r;
unsigned long flags;
if (!oh)
return -EINVAL;
spin_lock_irqsave(&oh->_lock, flags);
r = _idle(oh);
spin_unlock_irqrestore(&oh->_lock, flags);
return r;
}
/**
* omap_hwmod_shutdown - shutdown an omap_hwmod
* @ oh : struct omap_hwmod *
*
* Shutdown an omap_hwmod @ oh . Intended to be called by
* omap_device_shutdown ( ) . Returns - EINVAL on error or passes along
* the return value from _ shutdown ( ) .
*/
int omap_hwmod_shutdown(struct omap_hwmod *oh)
{
int r;
unsigned long flags;
if (!oh)
return -EINVAL;
spin_lock_irqsave(&oh->_lock, flags);
r = _shutdown(oh);
spin_unlock_irqrestore(&oh->_lock, flags);
return r;
}
/*
* IP block data retrieval functions
*/
/**
* omap_hwmod_get_mpu_rt_va - return the module ' s base address ( for the MPU )
* @ oh : struct omap_hwmod *
*
* Returns the virtual address corresponding to the beginning of the
* module ' s register target , in the address range that is intended to
* be used by the MPU . Returns the virtual address upon success or NULL
* upon error .
*/
void __iomem *omap_hwmod_get_mpu_rt_va(struct omap_hwmod *oh)
{
if (!oh)
return NULL;
if (oh->_int_flags & _HWMOD_NO_MPU_PORT)
return NULL;
if (oh->_state == _HWMOD_STATE_UNKNOWN)
return NULL;
return oh->_mpu_rt_va;
}
/*
* XXX what about functions for drivers to save / restore ocp_sysconfig
* for context save / restore operations ?
*/
/**
* omap_hwmod_assert_hardreset - assert the HW reset line of submodules
* contained in the hwmod module .
* @ oh : struct omap_hwmod *
* @ name : name of the reset line to lookup and assert
*
* Some IP like dsp , ipu or iva contain processor that require
* an HW reset line to be assert / deassert in order to enable fully
* the IP . Returns - EINVAL if @ oh is null or if the operation is not
* yet supported on this OMAP ; otherwise , passes along the return value
* from _ assert_hardreset ( ) .
*/
int omap_hwmod_assert_hardreset(struct omap_hwmod *oh, const char *name)
{
int ret;
unsigned long flags;
if (!oh)
return -EINVAL;
spin_lock_irqsave(&oh->_lock, flags);
ret = _assert_hardreset(oh, name);
spin_unlock_irqrestore(&oh->_lock, flags);
return ret;
}
/**
* omap_hwmod_deassert_hardreset - deassert the HW reset line of submodules
* contained in the hwmod module .
* @ oh : struct omap_hwmod *
* @ name : name of the reset line to look up and deassert
*
* Some IP like dsp , ipu or iva contain processor that require
* an HW reset line to be assert / deassert in order to enable fully
* the IP . Returns - EINVAL if @ oh is null or if the operation is not
* yet supported on this OMAP ; otherwise , passes along the return value
* from _ deassert_hardreset ( ) .
*/
int omap_hwmod_deassert_hardreset(struct omap_hwmod *oh, const char *name)
{
int ret;
unsigned long flags;
if (!oh)
return -EINVAL;
spin_lock_irqsave(&oh->_lock, flags);
ret = _deassert_hardreset(oh, name);
spin_unlock_irqrestore(&oh->_lock, flags);
return ret;
}
/**
* omap_hwmod_for_each_by_class - call @ fn for each hwmod of class @ classname
* @ classname : struct omap_hwmod_class name to search for
* @ fn : callback function pointer to call for each hwmod in class @ classname
* @ user : arbitrary context data to pass to the callback function
*
* For each omap_hwmod of class @ classname , call @ fn .
* If the callback function returns something other than
* zero , the iterator is terminated , and the callback function ' s return
* value is passed back to the caller . Returns 0 upon success , - EINVAL
* if @ classname or @ fn are NULL , or passes back the error code from @ fn .
*/
int omap_hwmod_for_each_by_class(const char *classname,
int (*fn)(struct omap_hwmod *oh,
void *user),
void *user)
{
struct omap_hwmod *temp_oh;
int ret = 0 ;
if (!classname || !fn)
return -EINVAL;
pr_debug("omap_hwmod: %s: looking for modules of class %s\n" ,
__func__, classname);
list_for_each_entry(temp_oh, &omap_hwmod_list, node) {
if (!strcmp(temp_oh->class ->name, classname)) {
pr_debug("omap_hwmod: %s: %s: calling callback fn\n" ,
__func__, temp_oh->name);
ret = (*fn)(temp_oh, user);
if (ret)
break ;
}
}
if (ret)
pr_debug("omap_hwmod: %s: iterator terminated early: %d\n" ,
__func__, ret);
return ret;
}
/**
* omap_hwmod_set_postsetup_state - set the post - _ setup ( ) state for this hwmod
* @ oh : struct omap_hwmod *
* @ state : state that _ setup ( ) should leave the hwmod in
*
* Sets the hwmod state that @ oh will enter at the end of _ setup ( )
* ( called by omap_hwmod_setup_ * ( ) ) . See also the documentation
* for _ setup_postsetup ( ) , above . Returns 0 upon success or
* - EINVAL if there is a problem with the arguments or if the hwmod is
* in the wrong state .
*/
int omap_hwmod_set_postsetup_state(struct omap_hwmod *oh, u8 state)
{
int ret;
unsigned long flags;
if (!oh)
return -EINVAL;
if (state != _HWMOD_STATE_DISABLED &&
state != _HWMOD_STATE_ENABLED &&
state != _HWMOD_STATE_IDLE)
return -EINVAL;
spin_lock_irqsave(&oh->_lock, flags);
if (oh->_state != _HWMOD_STATE_REGISTERED) {
ret = -EINVAL;
goto ohsps_unlock;
}
oh->_postsetup_state = state;
ret = 0 ;
ohsps_unlock:
spin_unlock_irqrestore(&oh->_lock, flags);
return ret;
}
/**
* omap_hwmod_init - initialize the hwmod code
*
* Sets up some function pointers needed by the hwmod code to operate on the
* currently - booted SoC . Intended to be called once during kernel init
* before any hwmods are registered . No return value .
*/
void __init omap_hwmod_init(void )
{
if (cpu_is_omap24xx()) {
soc_ops.wait_target_ready = _omap2xxx_3xxx_wait_target_ready;
soc_ops.assert_hardreset = _omap2_assert_hardreset;
soc_ops.deassert_hardreset = _omap2_deassert_hardreset;
soc_ops.is_hardreset_asserted = _omap2_is_hardreset_asserted;
} else if (cpu_is_omap34xx()) {
soc_ops.wait_target_ready = _omap2xxx_3xxx_wait_target_ready;
soc_ops.assert_hardreset = _omap2_assert_hardreset;
soc_ops.deassert_hardreset = _omap2_deassert_hardreset;
soc_ops.is_hardreset_asserted = _omap2_is_hardreset_asserted;
soc_ops.init_clkdm = _init_clkdm;
} else if (cpu_is_omap44xx() || soc_is_omap54xx() || soc_is_dra7xx()) {
soc_ops.enable_module = _omap4_enable_module;
soc_ops.disable_module = _omap4_disable_module;
soc_ops.wait_target_ready = _omap4_wait_target_ready;
soc_ops.assert_hardreset = _omap4_assert_hardreset;
soc_ops.deassert_hardreset = _omap4_deassert_hardreset;
soc_ops.is_hardreset_asserted = _omap4_is_hardreset_asserted;
soc_ops.init_clkdm = _init_clkdm;
soc_ops.update_context_lost = _omap4_update_context_lost;
soc_ops.get_context_lost = _omap4_get_context_lost;
soc_ops.disable_direct_prcm = _omap4_disable_direct_prcm;
soc_ops.xlate_clkctrl = _omap4_xlate_clkctrl;
} else if (cpu_is_ti814x() || cpu_is_ti816x() || soc_is_am33xx() ||
soc_is_am43xx()) {
soc_ops.enable_module = _omap4_enable_module;
soc_ops.disable_module = _omap4_disable_module;
soc_ops.wait_target_ready = _omap4_wait_target_ready;
soc_ops.assert_hardreset = _omap4_assert_hardreset;
soc_ops.deassert_hardreset = _am33xx_deassert_hardreset;
soc_ops.is_hardreset_asserted = _omap4_is_hardreset_asserted;
soc_ops.init_clkdm = _init_clkdm;
soc_ops.disable_direct_prcm = _omap4_disable_direct_prcm;
soc_ops.xlate_clkctrl = _omap4_xlate_clkctrl;
} else {
WARN(1 , "omap_hwmod: unknown SoC type\n" );
}
_init_clkctrl_providers();
inited = true ;
}
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