// SPDX-License-Identifier: GPL-2.0-or-later
/*
* Versatile board support using the device tree
*
* Copyright ( C ) 2010 Secret Lab Technologies Ltd .
* Copyright ( C ) 2009 Jeremy Kerr < jeremy . kerr @ canonical . com >
* Copyright ( C ) 2004 ARM Limited
* Copyright ( C ) 2000 Deep Blue Solutions Ltd
*/
#include <linux/init.h>
#include <linux/io.h>
#include <linux/of.h>
#include <linux/of_address.h>
#include <linux/of_irq.h>
#include <linux/of_platform.h>
#include <linux/slab.h>
#include <linux/amba/bus.h>
#include <linux/amba/mmci.h>
#include <asm /mach-types.h>
#include <asm /mach/arch.h>
#include <asm /mach/map.h>
/* macro to get at MMIO space when running virtually */
#define IO_ADDRESS(x) (((x) & 0 x0fffffff) + (((x) >> 4 ) & 0 x0f000000) + 0 xf0000000)
#define __io_address(n) ((void __iomem __force *)IO_ADDRESS(n))
/*
* - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
* Versatile Registers
* - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
*/
#define VERSATILE_SYS_PCICTL_OFFSET 0 x44
#define VERSATILE_SYS_MCI_OFFSET 0 x48
/*
* VERSATILE peripheral addresses
*/
#define VERSATILE_MMCI0_BASE 0 x10005000 /* MMC interface */
#define VERSATILE_MMCI1_BASE 0 x1000B000 /* MMC Interface */
#define VERSATILE_SCTL_BASE 0 x101E0000 /* System controller */
/*
* System controller bit assignment
*/
#define VERSATILE_REFCLK 0
#define VERSATILE_TIMCLK 1
#define VERSATILE_TIMER1_EnSel 15
#define VERSATILE_TIMER2_EnSel 17
#define VERSATILE_TIMER3_EnSel 19
#define VERSATILE_TIMER4_EnSel 21
static void __iomem *versatile_sys_base;
static unsigned int mmc_status(struct device *dev)
{
struct amba_device *adev = container_of(dev, struct amba_device, dev);
u32 mask;
if (adev->res.start == VERSATILE_MMCI0_BASE)
mask = 1 ;
else
mask = 2 ;
return readl(versatile_sys_base + VERSATILE_SYS_MCI_OFFSET) & mask;
}
static struct mmci_platform_data mmc0_plat_data = {
.ocr_mask = MMC_VDD_32_33|MMC_VDD_33_34,
.status = mmc_status,
};
static struct mmci_platform_data mmc1_plat_data = {
.ocr_mask = MMC_VDD_32_33|MMC_VDD_33_34,
.status = mmc_status,
};
/*
* Lookup table for attaching a specific name and platform_data pointer to
* devices as they get created by of_platform_populate ( ) . Ideally this table
* would not exist , but the current clock implementation depends on some devices
* having a specific name .
*/
struct of_dev_auxdata versatile_auxdata_lookup[] __initdata = {
OF_DEV_AUXDATA("arm,primecell" , VERSATILE_MMCI0_BASE, "fpga:05" , &mmc0_plat_data),
OF_DEV_AUXDATA("arm,primecell" , VERSATILE_MMCI1_BASE, "fpga:0b" , &mmc1_plat_data),
{}
};
static struct map_desc versatile_io_desc[] __initdata __maybe_unused = {
{
.virtual = IO_ADDRESS(VERSATILE_SCTL_BASE),
.pfn = __phys_to_pfn(VERSATILE_SCTL_BASE),
.length = SZ_4K * 9 ,
.type = MT_DEVICE
}
};
static void __init versatile_map_io(void )
{
debug_ll_io_init();
iotable_init(versatile_io_desc, ARRAY_SIZE(versatile_io_desc));
}
static void __init versatile_init_early(void )
{
u32 val;
/*
* set clock frequency :
* VERSATILE_REFCLK is 32 KHz
* VERSATILE_TIMCLK is 1 MHz
*/
val = readl(__io_address(VERSATILE_SCTL_BASE));
writel((VERSATILE_TIMCLK << VERSATILE_TIMER1_EnSel) |
(VERSATILE_TIMCLK << VERSATILE_TIMER2_EnSel) |
(VERSATILE_TIMCLK << VERSATILE_TIMER3_EnSel) |
(VERSATILE_TIMCLK << VERSATILE_TIMER4_EnSel) | val,
__io_address(VERSATILE_SCTL_BASE));
}
static void __init versatile_dt_pci_init(void )
{
u32 val;
struct device_node *np;
struct property *newprop;
np = of_find_compatible_node(NULL, NULL, "arm,versatile-pci" );
if (!np)
return ;
/* Check if PCI backplane is detected */
val = readl(versatile_sys_base + VERSATILE_SYS_PCICTL_OFFSET);
if (val & 1 ) {
/*
* Enable PCI accesses . Note that the documentaton is
* inconsistent whether or not this is needed , but the old
* driver had it so we will keep it .
*/
writel(1 , versatile_sys_base + VERSATILE_SYS_PCICTL_OFFSET);
goto out_put_node;
}
newprop = kzalloc(sizeof (*newprop), GFP_KERNEL);
if (!newprop)
goto out_put_node;
newprop->name = kstrdup("status" , GFP_KERNEL);
newprop->value = kstrdup("disabled" , GFP_KERNEL);
newprop->length = sizeof ("disabled" );
of_update_property(np, newprop);
pr_info("Not plugged into PCI backplane!\n" );
out_put_node:
of_node_put(np);
}
static void __init versatile_dt_init(void )
{
struct device_node *np;
np = of_find_compatible_node(NULL, NULL, "arm,core-module-versatile" );
if (np)
versatile_sys_base = of_iomap(np, 0 );
WARN_ON(!versatile_sys_base);
versatile_dt_pci_init();
of_platform_default_populate(NULL, versatile_auxdata_lookup, NULL);
}
static const char *const versatile_dt_match[] __initconst = {
"arm,versatile-ab" ,
"arm,versatile-pb" ,
NULL,
};
DT_MACHINE_START(VERSATILE_PB, "ARM-Versatile (Device Tree Support)" )
.map_io = versatile_map_io,
.init_early = versatile_init_early,
.init_machine = versatile_dt_init,
.dt_compat = versatile_dt_match,
MACHINE_END
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