// SPDX-License-Identifier: GPL-2.0-only
/*
* arch / arm / mm / cache - l2x0 . c - L210 / L220 / L310 cache controller support
*
* Copyright ( C ) 2007 ARM Limited
*/
#include <linux/cpu.h>
#include <linux/err.h>
#include <linux/init.h>
#include <linux/smp.h>
#include <linux/spinlock.h>
#include <linux/log2.h>
#include <linux/io.h>
#include <linux/of.h>
#include <linux/of_address.h>
#include <asm /cacheflush.h>
#include <asm /cp15.h>
#include <asm /cputype.h>
#include <asm /hardware/cache-l2x0.h>
#include <asm /hardware/cache-aurora-l2.h>
#include "cache-tauros3.h"
struct l2c_init_data {
const char *type;
unsigned way_size_0;
unsigned num_lock;
void (*of_parse)(const struct device_node *, u32 *, u32 *);
void (*enable)(void __iomem *, unsigned );
void (*fixup)(void __iomem *, u32, struct outer_cache_fns *);
void (*save)(void __iomem *);
void (*configure)(void __iomem *);
void (*unlock)(void __iomem *, unsigned );
struct outer_cache_fns outer_cache;
};
#define CACHE_LINE_SIZE 32
static void __iomem *l2x0_base;
static const struct l2c_init_data *l2x0_data;
static DEFINE_RAW_SPINLOCK(l2x0_lock);
static u32 l2x0_way_mask; /* Bitmask of active ways */
static u32 l2x0_size;
static unsigned long sync_reg_offset = L2X0_CACHE_SYNC;
struct l2x0_regs l2x0_saved_regs;
static bool l2x0_bresp_disable;
static bool l2x0_flz_disable;
/*
* Common code for all cache controllers .
*/
static inline void l2c_wait_mask(void __iomem *reg, unsigned long mask)
{
/* wait for cache operation by line or way to complete */
while (readl_relaxed(reg) & mask)
cpu_relax();
}
/*
* By default , we write directly to secure registers . Platforms must
* override this if they are running non - secure .
*/
static void l2c_write_sec(unsigned long val, void __iomem *base, unsigned reg)
{
if (val == readl_relaxed(base + reg))
return ;
if (outer_cache.write_sec)
outer_cache.write_sec(val, reg);
else
writel_relaxed(val, base + reg);
}
/*
* This should only be called when we have a requirement that the
* register be written due to a work - around , as platforms running
* in non - secure mode may not be able to access this register .
*/
static inline void l2c_set_debug(void __iomem *base, unsigned long val)
{
l2c_write_sec(val, base, L2X0_DEBUG_CTRL);
}
static void __l2c_op_way(void __iomem *reg)
{
writel_relaxed(l2x0_way_mask, reg);
l2c_wait_mask(reg, l2x0_way_mask);
}
static inline void l2c_unlock(void __iomem *base, unsigned num)
{
unsigned i;
for (i = 0 ; i < num; i++) {
writel_relaxed(0 , base + L2X0_LOCKDOWN_WAY_D_BASE +
i * L2X0_LOCKDOWN_STRIDE);
writel_relaxed(0 , base + L2X0_LOCKDOWN_WAY_I_BASE +
i * L2X0_LOCKDOWN_STRIDE);
}
}
static void l2c_configure(void __iomem *base)
{
l2c_write_sec(l2x0_saved_regs.aux_ctrl, base, L2X0_AUX_CTRL);
}
/*
* Enable the L2 cache controller . This function must only be
* called when the cache controller is known to be disabled .
*/
static void l2c_enable(void __iomem *base, unsigned num_lock)
{
unsigned long flags;
if (outer_cache.configure)
outer_cache.configure(&l2x0_saved_regs);
else
l2x0_data->configure(base);
l2x0_data->unlock(base, num_lock);
local_irq_save(flags);
__l2c_op_way(base + L2X0_INV_WAY);
writel_relaxed(0 , base + sync_reg_offset);
l2c_wait_mask(base + sync_reg_offset, 1 );
local_irq_restore(flags);
l2c_write_sec(L2X0_CTRL_EN, base, L2X0_CTRL);
}
static void l2c_disable(void )
{
void __iomem *base = l2x0_base;
l2x0_pmu_suspend();
outer_cache.flush_all();
l2c_write_sec(0 , base, L2X0_CTRL);
dsb(st);
}
static void l2c_save(void __iomem *base)
{
l2x0_saved_regs.aux_ctrl = readl_relaxed(l2x0_base + L2X0_AUX_CTRL);
}
static void l2c_resume(void )
{
void __iomem *base = l2x0_base;
/* Do not touch the controller if already enabled. */
if (!(readl_relaxed(base + L2X0_CTRL) & L2X0_CTRL_EN))
l2c_enable(base, l2x0_data->num_lock);
l2x0_pmu_resume();
}
/*
* L2C - 210 specific code .
*
* The L2C - 2 x0 PA , set / way and sync operations are atomic , but we must
* ensure that no background operation is running . The way operations
* are all background tasks .
*
* While a background operation is in progress , any new operation is
* ignored ( unspecified whether this causes an error . ) Thankfully , not
* used on SMP .
*
* Never has a different sync register other than L2X0_CACHE_SYNC , but
* we use sync_reg_offset here so we can share some of this with L2C - 310 .
*/
static void __l2c210_cache_sync(void __iomem *base)
{
writel_relaxed(0 , base + sync_reg_offset);
}
static void __l2c210_op_pa_range(void __iomem *reg, unsigned long start,
unsigned long end)
{
while (start < end) {
writel_relaxed(start, reg);
start += CACHE_LINE_SIZE;
}
}
static void l2c210_inv_range(unsigned long start, unsigned long end)
{
void __iomem *base = l2x0_base;
if (start & (CACHE_LINE_SIZE - 1 )) {
start &= ~(CACHE_LINE_SIZE - 1 );
writel_relaxed(start, base + L2X0_CLEAN_INV_LINE_PA);
start += CACHE_LINE_SIZE;
}
if (end & (CACHE_LINE_SIZE - 1 )) {
end &= ~(CACHE_LINE_SIZE - 1 );
writel_relaxed(end, base + L2X0_CLEAN_INV_LINE_PA);
}
__l2c210_op_pa_range(base + L2X0_INV_LINE_PA, start, end);
__l2c210_cache_sync(base);
}
static void l2c210_clean_range(unsigned long start, unsigned long end)
{
void __iomem *base = l2x0_base;
start &= ~(CACHE_LINE_SIZE - 1 );
__l2c210_op_pa_range(base + L2X0_CLEAN_LINE_PA, start, end);
__l2c210_cache_sync(base);
}
static void l2c210_flush_range(unsigned long start, unsigned long end)
{
void __iomem *base = l2x0_base;
start &= ~(CACHE_LINE_SIZE - 1 );
__l2c210_op_pa_range(base + L2X0_CLEAN_INV_LINE_PA, start, end);
__l2c210_cache_sync(base);
}
static void l2c210_flush_all(void )
{
void __iomem *base = l2x0_base;
BUG_ON(!irqs_disabled());
__l2c_op_way(base + L2X0_CLEAN_INV_WAY);
__l2c210_cache_sync(base);
}
static void l2c210_sync(void )
{
__l2c210_cache_sync(l2x0_base);
}
static const struct l2c_init_data l2c210_data __initconst = {
.type = "L2C-210" ,
.way_size_0 = SZ_8K,
.num_lock = 1 ,
.enable = l2c_enable,
.save = l2c_save,
.configure = l2c_configure,
.unlock = l2c_unlock,
.outer_cache = {
.inv_range = l2c210_inv_range,
.clean_range = l2c210_clean_range,
.flush_range = l2c210_flush_range,
.flush_all = l2c210_flush_all,
.disable = l2c_disable,
.sync = l2c210_sync,
.resume = l2c_resume,
},
};
/*
* L2C - 220 specific code .
*
* All operations are background operations : they have to be waited for .
* Conflicting requests generate a slave error ( which will cause an
* imprecise abort . ) Never uses sync_reg_offset , so we hard - code the
* sync register here .
*
* However , we can re - use the l2c210_resume call .
*/
static inline void __l2c220_cache_sync(void __iomem *base)
{
writel_relaxed(0 , base + L2X0_CACHE_SYNC);
l2c_wait_mask(base + L2X0_CACHE_SYNC, 1 );
}
static void l2c220_op_way(void __iomem *base, unsigned reg)
{
unsigned long flags;
raw_spin_lock_irqsave(&l2x0_lock, flags);
__l2c_op_way(base + reg);
__l2c220_cache_sync(base);
raw_spin_unlock_irqrestore(&l2x0_lock, flags);
}
static unsigned long l2c220_op_pa_range(void __iomem *reg, unsigned long start,
unsigned long end, unsigned long flags)
{
raw_spinlock_t *lock = &l2x0_lock;
while (start < end) {
unsigned long blk_end = start + min(end - start, 4096 UL);
while (start < blk_end) {
l2c_wait_mask(reg, 1 );
writel_relaxed(start, reg);
start += CACHE_LINE_SIZE;
}
if (blk_end < end) {
raw_spin_unlock_irqrestore(lock, flags);
raw_spin_lock_irqsave(lock, flags);
}
}
return flags;
}
static void l2c220_inv_range(unsigned long start, unsigned long end)
{
void __iomem *base = l2x0_base;
unsigned long flags;
raw_spin_lock_irqsave(&l2x0_lock, flags);
if ((start | end) & (CACHE_LINE_SIZE - 1 )) {
if (start & (CACHE_LINE_SIZE - 1 )) {
start &= ~(CACHE_LINE_SIZE - 1 );
writel_relaxed(start, base + L2X0_CLEAN_INV_LINE_PA);
start += CACHE_LINE_SIZE;
}
if (end & (CACHE_LINE_SIZE - 1 )) {
end &= ~(CACHE_LINE_SIZE - 1 );
l2c_wait_mask(base + L2X0_CLEAN_INV_LINE_PA, 1 );
writel_relaxed(end, base + L2X0_CLEAN_INV_LINE_PA);
}
}
flags = l2c220_op_pa_range(base + L2X0_INV_LINE_PA,
start, end, flags);
l2c_wait_mask(base + L2X0_INV_LINE_PA, 1 );
__l2c220_cache_sync(base);
raw_spin_unlock_irqrestore(&l2x0_lock, flags);
}
static void l2c220_clean_range(unsigned long start, unsigned long end)
{
void __iomem *base = l2x0_base;
unsigned long flags;
start &= ~(CACHE_LINE_SIZE - 1 );
if ((end - start) >= l2x0_size) {
l2c220_op_way(base, L2X0_CLEAN_WAY);
return ;
}
raw_spin_lock_irqsave(&l2x0_lock, flags);
flags = l2c220_op_pa_range(base + L2X0_CLEAN_LINE_PA,
start, end, flags);
l2c_wait_mask(base + L2X0_CLEAN_INV_LINE_PA, 1 );
__l2c220_cache_sync(base);
raw_spin_unlock_irqrestore(&l2x0_lock, flags);
}
static void l2c220_flush_range(unsigned long start, unsigned long end)
{
void __iomem *base = l2x0_base;
unsigned long flags;
start &= ~(CACHE_LINE_SIZE - 1 );
if ((end - start) >= l2x0_size) {
l2c220_op_way(base, L2X0_CLEAN_INV_WAY);
return ;
}
raw_spin_lock_irqsave(&l2x0_lock, flags);
flags = l2c220_op_pa_range(base + L2X0_CLEAN_INV_LINE_PA,
start, end, flags);
l2c_wait_mask(base + L2X0_CLEAN_INV_LINE_PA, 1 );
__l2c220_cache_sync(base);
raw_spin_unlock_irqrestore(&l2x0_lock, flags);
}
static void l2c220_flush_all(void )
{
l2c220_op_way(l2x0_base, L2X0_CLEAN_INV_WAY);
}
static void l2c220_sync(void )
{
unsigned long flags;
raw_spin_lock_irqsave(&l2x0_lock, flags);
__l2c220_cache_sync(l2x0_base);
raw_spin_unlock_irqrestore(&l2x0_lock, flags);
}
static void l2c220_enable(void __iomem *base, unsigned num_lock)
{
/*
* Always enable non - secure access to the lockdown registers -
* we write to them as part of the L2C enable sequence so they
* need to be accessible .
*/
l2x0_saved_regs.aux_ctrl |= L220_AUX_CTRL_NS_LOCKDOWN;
l2c_enable(base, num_lock);
}
static void l2c220_unlock(void __iomem *base, unsigned num_lock)
{
if (readl_relaxed(base + L2X0_AUX_CTRL) & L220_AUX_CTRL_NS_LOCKDOWN)
l2c_unlock(base, num_lock);
}
static const struct l2c_init_data l2c220_data = {
.type = "L2C-220" ,
.way_size_0 = SZ_8K,
.num_lock = 1 ,
.enable = l2c220_enable,
.save = l2c_save,
.configure = l2c_configure,
.unlock = l2c220_unlock,
.outer_cache = {
.inv_range = l2c220_inv_range,
.clean_range = l2c220_clean_range,
.flush_range = l2c220_flush_range,
.flush_all = l2c220_flush_all,
.disable = l2c_disable,
.sync = l2c220_sync,
.resume = l2c_resume,
},
};
/*
* L2C - 310 specific code .
*
* Very similar to L2C - 210 , the PA , set / way and sync operations are atomic ,
* and the way operations are all background tasks . However , issuing an
* operation while a background operation is in progress results in a
* SLVERR response . We can reuse :
*
* _ _ l2c210_cache_sync ( using sync_reg_offset )
* l2c210_sync
* l2c210_inv_range ( if 588369 is not applicable )
* l2c210_clean_range
* l2c210_flush_range ( if 588369 is not applicable )
* l2c210_flush_all ( if 727915 is not applicable )
*
* Errata :
* 588369 : PL310 R0P0 - > R1P0 , fixed R2P0 .
* Affects : all clean + invalidate operations
* clean and invalidate skips the invalidate step , so we need to issue
* separate operations . We also require the above debug workaround
* enclosing this code fragment on affected parts . On unaffected parts ,
* we must not use this workaround without the debug register writes
* to avoid exposing a problem similar to 727915 .
*
* 727915 : PL310 R2P0 - > R3P0 , fixed R3P1 .
* Affects : clean + invalidate by way
* clean and invalidate by way runs in the background , and a store can
* hit the line between the clean operation and invalidate operation ,
* resulting in the store being lost .
*
* 752271 : PL310 R3P0 - > R3P1 - 50 REL0 , fixed R3P2 .
* Affects : 8 x64 - bit ( double fill ) line fetches
* double fill line fetches can fail to cause dirty data to be evicted
* from the cache before the new data overwrites the second line .
*
* 753970 : PL310 R3P0 , fixed R3P1 .
* Affects : sync
* prevents merging writes after the sync operation , until another L2C
* operation is performed ( or a number of other conditions . )
*
* 769419 : PL310 R0P0 - > R3P1 , fixed R3P2 .
* Affects : store buffer
* store buffer is not automatically drained .
*/
static void l2c310_inv_range_erratum(unsigned long start, unsigned long end)
{
void __iomem *base = l2x0_base;
if ((start | end) & (CACHE_LINE_SIZE - 1 )) {
unsigned long flags;
/* Erratum 588369 for both clean+invalidate operations */
raw_spin_lock_irqsave(&l2x0_lock, flags);
l2c_set_debug(base, 0 x03);
if (start & (CACHE_LINE_SIZE - 1 )) {
start &= ~(CACHE_LINE_SIZE - 1 );
writel_relaxed(start, base + L2X0_CLEAN_LINE_PA);
writel_relaxed(start, base + L2X0_INV_LINE_PA);
start += CACHE_LINE_SIZE;
}
if (end & (CACHE_LINE_SIZE - 1 )) {
end &= ~(CACHE_LINE_SIZE - 1 );
writel_relaxed(end, base + L2X0_CLEAN_LINE_PA);
writel_relaxed(end, base + L2X0_INV_LINE_PA);
}
l2c_set_debug(base, 0 x00);
raw_spin_unlock_irqrestore(&l2x0_lock, flags);
}
__l2c210_op_pa_range(base + L2X0_INV_LINE_PA, start, end);
__l2c210_cache_sync(base);
}
static void l2c310_flush_range_erratum(unsigned long start, unsigned long end)
{
raw_spinlock_t *lock = &l2x0_lock;
unsigned long flags;
void __iomem *base = l2x0_base;
raw_spin_lock_irqsave(lock, flags);
while (start < end) {
unsigned long blk_end = start + min(end - start, 4096 UL);
l2c_set_debug(base, 0 x03);
while (start < blk_end) {
writel_relaxed(start, base + L2X0_CLEAN_LINE_PA);
writel_relaxed(start, base + L2X0_INV_LINE_PA);
start += CACHE_LINE_SIZE;
}
l2c_set_debug(base, 0 x00);
if (blk_end < end) {
raw_spin_unlock_irqrestore(lock, flags);
raw_spin_lock_irqsave(lock, flags);
}
}
raw_spin_unlock_irqrestore(lock, flags);
__l2c210_cache_sync(base);
}
static void l2c310_flush_all_erratum(void )
{
void __iomem *base = l2x0_base;
unsigned long flags;
raw_spin_lock_irqsave(&l2x0_lock, flags);
l2c_set_debug(base, 0 x03);
__l2c_op_way(base + L2X0_CLEAN_INV_WAY);
l2c_set_debug(base, 0 x00);
__l2c210_cache_sync(base);
raw_spin_unlock_irqrestore(&l2x0_lock, flags);
}
static void __init l2c310_save(void __iomem *base)
{
unsigned revision;
l2c_save(base);
l2x0_saved_regs.tag_latency = readl_relaxed(base +
L310_TAG_LATENCY_CTRL);
l2x0_saved_regs.data_latency = readl_relaxed(base +
L310_DATA_LATENCY_CTRL);
l2x0_saved_regs.filter_end = readl_relaxed(base +
L310_ADDR_FILTER_END);
l2x0_saved_regs.filter_start = readl_relaxed(base +
L310_ADDR_FILTER_START);
revision = readl_relaxed(base + L2X0_CACHE_ID) &
L2X0_CACHE_ID_RTL_MASK;
/* From r2p0, there is Prefetch offset/control register */
if (revision >= L310_CACHE_ID_RTL_R2P0)
l2x0_saved_regs.prefetch_ctrl = readl_relaxed(base +
L310_PREFETCH_CTRL);
/* From r3p0, there is Power control register */
if (revision >= L310_CACHE_ID_RTL_R3P0)
l2x0_saved_regs.pwr_ctrl = readl_relaxed(base +
L310_POWER_CTRL);
}
static void l2c310_configure(void __iomem *base)
{
unsigned revision;
l2c_configure(base);
/* restore pl310 setup */
l2c_write_sec(l2x0_saved_regs.tag_latency, base,
L310_TAG_LATENCY_CTRL);
l2c_write_sec(l2x0_saved_regs.data_latency, base,
L310_DATA_LATENCY_CTRL);
l2c_write_sec(l2x0_saved_regs.filter_end, base,
L310_ADDR_FILTER_END);
l2c_write_sec(l2x0_saved_regs.filter_start, base,
L310_ADDR_FILTER_START);
revision = readl_relaxed(base + L2X0_CACHE_ID) &
L2X0_CACHE_ID_RTL_MASK;
if (revision >= L310_CACHE_ID_RTL_R2P0)
l2c_write_sec(l2x0_saved_regs.prefetch_ctrl, base,
L310_PREFETCH_CTRL);
if (revision >= L310_CACHE_ID_RTL_R3P0)
l2c_write_sec(l2x0_saved_regs.pwr_ctrl, base,
L310_POWER_CTRL);
}
static int l2c310_starting_cpu(unsigned int cpu)
{
set_auxcr(get_auxcr() | BIT(3 ) | BIT(2 ) | BIT(1 ));
return 0 ;
}
static int l2c310_dying_cpu(unsigned int cpu)
{
set_auxcr(get_auxcr() & ~(BIT(3 ) | BIT(2 ) | BIT(1 )));
return 0 ;
}
static void __init l2c310_enable(void __iomem *base, unsigned num_lock)
{
unsigned rev = readl_relaxed(base + L2X0_CACHE_ID) & L2X0_CACHE_ID_RTL_MASK;
bool cortex_a9 = read_cpuid_part() == ARM_CPU_PART_CORTEX_A9;
u32 aux = l2x0_saved_regs.aux_ctrl;
if (rev >= L310_CACHE_ID_RTL_R2P0) {
if (cortex_a9 && !l2x0_bresp_disable) {
aux |= L310_AUX_CTRL_EARLY_BRESP;
pr_info("L2C-310 enabling early BRESP for Cortex-A9\n" );
} else if (aux & L310_AUX_CTRL_EARLY_BRESP) {
pr_warn("L2C-310 early BRESP only supported with Cortex-A9\n" );
aux &= ~L310_AUX_CTRL_EARLY_BRESP;
}
}
if (cortex_a9 && !l2x0_flz_disable) {
u32 aux_cur = readl_relaxed(base + L2X0_AUX_CTRL);
u32 acr = get_auxcr();
pr_debug("Cortex-A9 ACR=0x%08x\n" , acr);
if (acr & BIT(3 ) && !(aux_cur & L310_AUX_CTRL_FULL_LINE_ZERO))
pr_err("L2C-310: full line of zeros enabled in Cortex-A9 but not L2C-310 - invalid\n" );
if (aux & L310_AUX_CTRL_FULL_LINE_ZERO && !(acr & BIT(3 )))
pr_err("L2C-310: enabling full line of zeros but not enabled in Cortex-A9\n" );
if (!(aux & L310_AUX_CTRL_FULL_LINE_ZERO) && !outer_cache.write_sec) {
aux |= L310_AUX_CTRL_FULL_LINE_ZERO;
pr_info("L2C-310 full line of zeros enabled for Cortex-A9\n" );
}
} else if (aux & (L310_AUX_CTRL_FULL_LINE_ZERO | L310_AUX_CTRL_EARLY_BRESP)) {
pr_err("L2C-310: disabling Cortex-A9 specific feature bits\n" );
aux &= ~(L310_AUX_CTRL_FULL_LINE_ZERO | L310_AUX_CTRL_EARLY_BRESP);
}
/*
* Always enable non - secure access to the lockdown registers -
* we write to them as part of the L2C enable sequence so they
* need to be accessible .
*/
l2x0_saved_regs.aux_ctrl = aux | L310_AUX_CTRL_NS_LOCKDOWN;
l2c_enable(base, num_lock);
/* Read back resulting AUX_CTRL value as it could have been altered. */
aux = readl_relaxed(base + L2X0_AUX_CTRL);
if (aux & (L310_AUX_CTRL_DATA_PREFETCH | L310_AUX_CTRL_INSTR_PREFETCH)) {
u32 prefetch = readl_relaxed(base + L310_PREFETCH_CTRL);
pr_info("L2C-310 %s%s prefetch enabled, offset %u lines\n" ,
aux & L310_AUX_CTRL_INSTR_PREFETCH ? "I" : "" ,
aux & L310_AUX_CTRL_DATA_PREFETCH ? "D" : "" ,
1 + (prefetch & L310_PREFETCH_CTRL_OFFSET_MASK));
}
/* r3p0 or later has power control register */
if (rev >= L310_CACHE_ID_RTL_R3P0) {
u32 power_ctrl;
power_ctrl = readl_relaxed(base + L310_POWER_CTRL);
pr_info("L2C-310 dynamic clock gating %sabled, standby mode %sabled\n" ,
power_ctrl & L310_DYNAMIC_CLK_GATING_EN ? "en" : "dis" ,
power_ctrl & L310_STNDBY_MODE_EN ? "en" : "dis" );
}
if (aux & L310_AUX_CTRL_FULL_LINE_ZERO)
cpuhp_setup_state(CPUHP_AP_ARM_L2X0_STARTING,
"arm/l2x0:starting" , l2c310_starting_cpu,
l2c310_dying_cpu);
}
static void __init l2c310_fixup(void __iomem *base, u32 cache_id,
struct outer_cache_fns *fns)
{
unsigned revision = cache_id & L2X0_CACHE_ID_RTL_MASK;
const char *errata[8 ];
unsigned n = 0 ;
if (IS_ENABLED(CONFIG_PL310_ERRATA_588369) &&
revision < L310_CACHE_ID_RTL_R2P0 &&
/* For bcm compatibility */
fns->inv_range == l2c210_inv_range) {
fns->inv_range = l2c310_inv_range_erratum;
fns->flush_range = l2c310_flush_range_erratum;
errata[n++] = "588369" ;
}
if (IS_ENABLED(CONFIG_PL310_ERRATA_727915) &&
revision >= L310_CACHE_ID_RTL_R2P0 &&
revision < L310_CACHE_ID_RTL_R3P1) {
fns->flush_all = l2c310_flush_all_erratum;
errata[n++] = "727915" ;
}
if (revision >= L310_CACHE_ID_RTL_R3P0 &&
revision < L310_CACHE_ID_RTL_R3P2) {
u32 val = l2x0_saved_regs.prefetch_ctrl;
if (val & L310_PREFETCH_CTRL_DBL_LINEFILL) {
val &= ~L310_PREFETCH_CTRL_DBL_LINEFILL;
l2x0_saved_regs.prefetch_ctrl = val;
errata[n++] = "752271" ;
}
}
if (IS_ENABLED(CONFIG_PL310_ERRATA_753970) &&
revision == L310_CACHE_ID_RTL_R3P0) {
sync_reg_offset = L2X0_DUMMY_REG;
errata[n++] = "753970" ;
}
if (IS_ENABLED(CONFIG_PL310_ERRATA_769419))
errata[n++] = "769419" ;
if (n) {
unsigned i;
pr_info("L2C-310 errat%s" , n > 1 ? "a" : "um" );
for (i = 0 ; i < n; i++)
pr_cont(" %s" , errata[i]);
pr_cont(" enabled\n" );
}
}
static void l2c310_disable(void )
{
/*
* If full - line - of - zeros is enabled , we must first disable it in the
* Cortex - A9 auxiliary control register before disabling the L2 cache .
*/
if (l2x0_saved_regs.aux_ctrl & L310_AUX_CTRL_FULL_LINE_ZERO)
set_auxcr(get_auxcr() & ~(BIT(3 ) | BIT(2 ) | BIT(1 )));
l2c_disable();
}
static void l2c310_resume(void )
{
l2c_resume();
/* Re-enable full-line-of-zeros for Cortex-A9 */
if (l2x0_saved_regs.aux_ctrl & L310_AUX_CTRL_FULL_LINE_ZERO)
set_auxcr(get_auxcr() | BIT(3 ) | BIT(2 ) | BIT(1 ));
}
static void l2c310_unlock(void __iomem *base, unsigned num_lock)
{
if (readl_relaxed(base + L2X0_AUX_CTRL) & L310_AUX_CTRL_NS_LOCKDOWN)
l2c_unlock(base, num_lock);
}
static const struct l2c_init_data l2c310_init_fns __initconst = {
.type = "L2C-310" ,
.way_size_0 = SZ_8K,
.num_lock = 8 ,
.enable = l2c310_enable,
.fixup = l2c310_fixup,
.save = l2c310_save,
.configure = l2c310_configure,
.unlock = l2c310_unlock,
.outer_cache = {
.inv_range = l2c210_inv_range,
.clean_range = l2c210_clean_range,
.flush_range = l2c210_flush_range,
.flush_all = l2c210_flush_all,
.disable = l2c310_disable,
.sync = l2c210_sync,
.resume = l2c310_resume,
},
};
static int __init __l2c_init(const struct l2c_init_data *data,
u32 aux_val, u32 aux_mask, u32 cache_id, bool nosync)
{
struct outer_cache_fns fns;
unsigned way_size_bits, ways;
u32 aux, old_aux;
/*
* Save the pointer globally so that callbacks which do not receive
* context from callers can access the structure .
*/
l2x0_data = kmemdup(data, sizeof (*data), GFP_KERNEL);
if (!l2x0_data)
return -ENOMEM;
/*
* Sanity check the aux values . aux_mask is the bits we preserve
* from reading the hardware register , and aux_val is the bits we
* set .
*/
if (aux_val & aux_mask)
pr_alert("L2C: platform provided aux values permit register corruption.\n" );
old_aux = aux = readl_relaxed(l2x0_base + L2X0_AUX_CTRL);
aux &= aux_mask;
aux |= aux_val;
if (old_aux != aux)
pr_warn("L2C: DT/platform modifies aux control register: 0x%08x -> 0x%08x\n" ,
old_aux, aux);
/* Determine the number of ways */
switch (cache_id & L2X0_CACHE_ID_PART_MASK) {
case L2X0_CACHE_ID_PART_L310:
if ((aux_val | ~aux_mask) & (L2C_AUX_CTRL_WAY_SIZE_MASK | L310_AUX_CTRL_ASSOCIATIVITY_16))
pr_warn("L2C: DT/platform tries to modify or specify cache size\n" );
if (aux & (1 << 16 ))
ways = 16 ;
else
ways = 8 ;
break ;
case L2X0_CACHE_ID_PART_L210:
case L2X0_CACHE_ID_PART_L220:
ways = (aux >> 13 ) & 0 xf;
break ;
case AURORA_CACHE_ID:
ways = (aux >> 13 ) & 0 xf;
ways = 2 << ((ways + 1 ) >> 2 );
break ;
default :
/* Assume unknown chips have 8 ways */
ways = 8 ;
break ;
}
l2x0_way_mask = (1 << ways) - 1 ;
/*
* way_size_0 is the size that a way_size value of zero would be
* given the calculation : way_size = way_size_0 < < way_size_bits .
* So , if way_size_bits = 0 is reserved , but way_size_bits = 1 is 16 k ,
* then way_size_0 would be 8 k .
*
* L2 cache size = number of ways * way size .
*/
way_size_bits = (aux & L2C_AUX_CTRL_WAY_SIZE_MASK) >>
L2C_AUX_CTRL_WAY_SIZE_SHIFT;
l2x0_size = ways * (data->way_size_0 << way_size_bits);
fns = data->outer_cache;
fns.write_sec = outer_cache.write_sec;
fns.configure = outer_cache.configure;
if (data->fixup)
data->fixup(l2x0_base, cache_id, &fns);
if (nosync) {
pr_info("L2C: disabling outer sync\n" );
fns.sync = NULL;
}
/*
* Check if l2x0 controller is already enabled . If we are booting
* in non - secure mode accessing the below registers will fault .
*/
if (!(readl_relaxed(l2x0_base + L2X0_CTRL) & L2X0_CTRL_EN)) {
l2x0_saved_regs.aux_ctrl = aux;
data->enable(l2x0_base, data->num_lock);
}
outer_cache = fns;
/*
* It is strange to save the register state before initialisation ,
* but hey , this is what the DT implementations decided to do .
*/
if (data->save)
data->save(l2x0_base);
/* Re-read it in case some bits are reserved. */
aux = readl_relaxed(l2x0_base + L2X0_AUX_CTRL);
pr_info("%s cache controller enabled, %d ways, %d kB\n" ,
data->type, ways, l2x0_size >> 10 );
pr_info("%s: CACHE_ID 0x%08x, AUX_CTRL 0x%08x\n" ,
data->type, cache_id, aux);
l2x0_pmu_register(l2x0_base, cache_id);
return 0 ;
}
void __init l2x0_init(void __iomem *base, u32 aux_val, u32 aux_mask)
{
const struct l2c_init_data *data;
u32 cache_id;
l2x0_base = base;
cache_id = readl_relaxed(base + L2X0_CACHE_ID);
switch (cache_id & L2X0_CACHE_ID_PART_MASK) {
default :
case L2X0_CACHE_ID_PART_L210:
data = &l2c210_data;
break ;
case L2X0_CACHE_ID_PART_L220:
data = &l2c220_data;
break ;
case L2X0_CACHE_ID_PART_L310:
data = &l2c310_init_fns;
break ;
}
/* Read back current (default) hardware configuration */
if (data->save)
data->save(l2x0_base);
__l2c_init(data, aux_val, aux_mask, cache_id, false );
}
#ifdef CONFIG_OF
static int l2_wt_override;
/* Aurora don't have the cache ID register available, so we have to
* pass it though the device tree */
static u32 cache_id_part_number_from_dt;
/**
* l2x0_cache_size_of_parse ( ) - read cache size parameters from DT
* @ np : the device tree node for the l2 cache
* @ aux_val : pointer to machine - supplied auxilary register value , to
* be augmented by the call ( bits to be set to 1 )
* @ aux_mask : pointer to machine - supplied auxilary register mask , to
* be augmented by the call ( bits to be set to 0 )
* @ associativity : variable to return the calculated associativity in
* @ max_way_size : the maximum size in bytes for the cache ways
*/
static int __init l2x0_cache_size_of_parse(const struct device_node *np,
u32 *aux_val, u32 *aux_mask,
u32 *associativity,
u32 max_way_size)
{
u32 mask = 0 , val = 0 ;
u32 cache_size = 0 , sets = 0 ;
u32 way_size_bits = 1 ;
u32 way_size = 0 ;
u32 block_size = 0 ;
u32 line_size = 0 ;
of_property_read_u32(np, "cache-size" , &cache_size);
of_property_read_u32(np, "cache-sets" , &sets);
of_property_read_u32(np, "cache-block-size" , &block_size);
of_property_read_u32(np, "cache-line-size" , &line_size);
if (!cache_size || !sets)
return -ENODEV;
/* All these l2 caches have the same line = block size actually */
if (!line_size) {
if (block_size) {
/* If linesize is not given, it is equal to blocksize */
line_size = block_size;
} else {
/* Fall back to known size */
pr_warn("L2C OF: no cache block/line size given: "
"falling back to default size %d bytes\n" ,
CACHE_LINE_SIZE);
line_size = CACHE_LINE_SIZE;
}
}
if (line_size != CACHE_LINE_SIZE)
pr_warn("L2C OF: DT supplied line size %d bytes does "
"not match hardware line size of %d bytes\n" ,
line_size,
CACHE_LINE_SIZE);
/*
* Since :
* set size = cache size / sets
* ways = cache size / ( sets * line size )
* way size = cache size / ( cache size / ( sets * line size ) )
* way size = sets * line size
* associativity = ways = cache size / way size
*/
way_size = sets * line_size;
*associativity = cache_size / way_size;
if (way_size > max_way_size) {
pr_err("L2C OF: set size %dKB is too large\n" , way_size);
return -EINVAL;
}
pr_info("L2C OF: override cache size: %d bytes (%dKB)\n" ,
cache_size, cache_size >> 10 );
pr_info("L2C OF: override line size: %d bytes\n" , line_size);
pr_info("L2C OF: override way size: %d bytes (%dKB)\n" ,
way_size, way_size >> 10 );
pr_info("L2C OF: override associativity: %d\n" , *associativity);
/*
* Calculates the bits 17 : 19 to set for way size :
* 512 KB - > 6 , 256 KB - > 5 , . . . 16 KB - > 1
*/
way_size_bits = ilog2(way_size >> 10 ) - 3 ;
if (way_size_bits < 1 || way_size_bits > 6 ) {
pr_err("L2C OF: cache way size illegal: %dKB is not mapped\n" ,
way_size);
return -EINVAL;
}
mask |= L2C_AUX_CTRL_WAY_SIZE_MASK;
val |= (way_size_bits << L2C_AUX_CTRL_WAY_SIZE_SHIFT);
*aux_val &= ~mask;
*aux_val |= val;
*aux_mask &= ~mask;
return 0 ;
}
static void __init l2x0_of_parse(const struct device_node *np,
u32 *aux_val, u32 *aux_mask)
{
u32 data[2 ] = { 0 , 0 };
u32 tag = 0 ;
u32 dirty = 0 ;
u32 val = 0 , mask = 0 ;
u32 assoc;
int ret;
of_property_read_u32(np, "arm,tag-latency" , &tag);
if (tag) {
mask |= L2X0_AUX_CTRL_TAG_LATENCY_MASK;
val |= (tag - 1 ) << L2X0_AUX_CTRL_TAG_LATENCY_SHIFT;
}
of_property_read_u32_array(np, "arm,data-latency" ,
data, ARRAY_SIZE(data));
if (data[0 ] && data[1 ]) {
mask |= L2X0_AUX_CTRL_DATA_RD_LATENCY_MASK |
L2X0_AUX_CTRL_DATA_WR_LATENCY_MASK;
val |= ((data[0 ] - 1 ) << L2X0_AUX_CTRL_DATA_RD_LATENCY_SHIFT) |
((data[1 ] - 1 ) << L2X0_AUX_CTRL_DATA_WR_LATENCY_SHIFT);
}
of_property_read_u32(np, "arm,dirty-latency" , &dirty);
if (dirty) {
mask |= L2X0_AUX_CTRL_DIRTY_LATENCY_MASK;
val |= (dirty - 1 ) << L2X0_AUX_CTRL_DIRTY_LATENCY_SHIFT;
}
if (of_property_read_bool(np, "arm,parity-enable" )) {
mask &= ~L2C_AUX_CTRL_PARITY_ENABLE;
val |= L2C_AUX_CTRL_PARITY_ENABLE;
} else if (of_property_read_bool(np, "arm,parity-disable" )) {
mask &= ~L2C_AUX_CTRL_PARITY_ENABLE;
}
if (of_property_read_bool(np, "arm,shared-override" )) {
mask &= ~L2C_AUX_CTRL_SHARED_OVERRIDE;
val |= L2C_AUX_CTRL_SHARED_OVERRIDE;
}
ret = l2x0_cache_size_of_parse(np, aux_val, aux_mask, &assoc, SZ_256K);
if (ret)
return ;
if (assoc > 8 ) {
pr_err("l2x0 of: cache setting yield too high associativity\n" );
pr_err("l2x0 of: %d calculated, max 8\n" , assoc);
} else {
mask |= L2X0_AUX_CTRL_ASSOC_MASK;
val |= (assoc << L2X0_AUX_CTRL_ASSOC_SHIFT);
}
*aux_val &= ~mask;
*aux_val |= val;
*aux_mask &= ~mask;
}
static const struct l2c_init_data of_l2c210_data __initconst = {
.type = "L2C-210" ,
.way_size_0 = SZ_8K,
.num_lock = 1 ,
.of_parse = l2x0_of_parse,
.enable = l2c_enable,
.save = l2c_save,
.configure = l2c_configure,
.unlock = l2c_unlock,
.outer_cache = {
.inv_range = l2c210_inv_range,
.clean_range = l2c210_clean_range,
.flush_range = l2c210_flush_range,
.flush_all = l2c210_flush_all,
.disable = l2c_disable,
.sync = l2c210_sync,
.resume = l2c_resume,
},
};
static const struct l2c_init_data of_l2c220_data __initconst = {
.type = "L2C-220" ,
.way_size_0 = SZ_8K,
.num_lock = 1 ,
.of_parse = l2x0_of_parse,
.enable = l2c220_enable,
.save = l2c_save,
.configure = l2c_configure,
.unlock = l2c220_unlock,
.outer_cache = {
.inv_range = l2c220_inv_range,
.clean_range = l2c220_clean_range,
.flush_range = l2c220_flush_range,
.flush_all = l2c220_flush_all,
.disable = l2c_disable,
.sync = l2c220_sync,
.resume = l2c_resume,
},
};
static void __init l2c310_of_parse(const struct device_node *np,
u32 *aux_val, u32 *aux_mask)
{
u32 data[3 ] = { 0 , 0 , 0 };
u32 tag[3 ] = { 0 , 0 , 0 };
u32 filter[2 ] = { 0 , 0 };
u32 assoc;
u32 prefetch;
u32 power;
u32 val;
int ret;
of_property_read_u32_array(np, "arm,tag-latency" , tag, ARRAY_SIZE(tag));
if (tag[0 ] && tag[1 ] && tag[2 ])
l2x0_saved_regs.tag_latency =
L310_LATENCY_CTRL_RD(tag[0 ] - 1 ) |
L310_LATENCY_CTRL_WR(tag[1 ] - 1 ) |
L310_LATENCY_CTRL_SETUP(tag[2 ] - 1 );
of_property_read_u32_array(np, "arm,data-latency" ,
data, ARRAY_SIZE(data));
if (data[0 ] && data[1 ] && data[2 ])
l2x0_saved_regs.data_latency =
L310_LATENCY_CTRL_RD(data[0 ] - 1 ) |
L310_LATENCY_CTRL_WR(data[1 ] - 1 ) |
L310_LATENCY_CTRL_SETUP(data[2 ] - 1 );
of_property_read_u32_array(np, "arm,filter-ranges" ,
filter, ARRAY_SIZE(filter));
if (filter[1 ]) {
l2x0_saved_regs.filter_end =
ALIGN(filter[0 ] + filter[1 ], SZ_1M);
l2x0_saved_regs.filter_start = (filter[0 ] & ~(SZ_1M - 1 ))
| L310_ADDR_FILTER_EN;
}
ret = l2x0_cache_size_of_parse(np, aux_val, aux_mask, &assoc, SZ_512K);
if (!ret) {
switch (assoc) {
case 16 :
*aux_val &= ~L2X0_AUX_CTRL_ASSOC_MASK;
*aux_val |= L310_AUX_CTRL_ASSOCIATIVITY_16;
*aux_mask &= ~L2X0_AUX_CTRL_ASSOC_MASK;
break ;
case 8 :
*aux_val &= ~L2X0_AUX_CTRL_ASSOC_MASK;
*aux_mask &= ~L2X0_AUX_CTRL_ASSOC_MASK;
break ;
default :
pr_err("L2C-310 OF cache associativity %d invalid, only 8 or 16 permitted\n" ,
assoc);
break ;
}
}
if (of_property_read_bool(np, "arm,shared-override" )) {
*aux_val |= L2C_AUX_CTRL_SHARED_OVERRIDE;
*aux_mask &= ~L2C_AUX_CTRL_SHARED_OVERRIDE;
}
if (of_property_read_bool(np, "arm,parity-enable" )) {
*aux_val |= L2C_AUX_CTRL_PARITY_ENABLE;
*aux_mask &= ~L2C_AUX_CTRL_PARITY_ENABLE;
} else if (of_property_read_bool(np, "arm,parity-disable" )) {
*aux_val &= ~L2C_AUX_CTRL_PARITY_ENABLE;
*aux_mask &= ~L2C_AUX_CTRL_PARITY_ENABLE;
}
if (of_property_read_bool(np, "arm,early-bresp-disable" ))
l2x0_bresp_disable = true ;
if (of_property_read_bool(np, "arm,full-line-zero-disable" ))
l2x0_flz_disable = true ;
prefetch = l2x0_saved_regs.prefetch_ctrl;
ret = of_property_read_u32(np, "arm,double-linefill" , &val);
if (ret == 0 ) {
if (val)
prefetch |= L310_PREFETCH_CTRL_DBL_LINEFILL;
else
prefetch &= ~L310_PREFETCH_CTRL_DBL_LINEFILL;
} else if (ret != -EINVAL) {
pr_err("L2C-310 OF arm,double-linefill property value is missing\n" );
}
ret = of_property_read_u32(np, "arm,double-linefill-incr" , &val);
if (ret == 0 ) {
if (val)
prefetch |= L310_PREFETCH_CTRL_DBL_LINEFILL_INCR;
else
prefetch &= ~L310_PREFETCH_CTRL_DBL_LINEFILL_INCR;
} else if (ret != -EINVAL) {
pr_err("L2C-310 OF arm,double-linefill-incr property value is missing\n" );
}
ret = of_property_read_u32(np, "arm,double-linefill-wrap" , &val);
if (ret == 0 ) {
if (!val)
prefetch |= L310_PREFETCH_CTRL_DBL_LINEFILL_WRAP;
else
prefetch &= ~L310_PREFETCH_CTRL_DBL_LINEFILL_WRAP;
} else if (ret != -EINVAL) {
pr_err("L2C-310 OF arm,double-linefill-wrap property value is missing\n" );
}
ret = of_property_read_u32(np, "arm,prefetch-drop" , &val);
if (ret == 0 ) {
if (val)
prefetch |= L310_PREFETCH_CTRL_PREFETCH_DROP;
else
prefetch &= ~L310_PREFETCH_CTRL_PREFETCH_DROP;
} else if (ret != -EINVAL) {
pr_err("L2C-310 OF arm,prefetch-drop property value is missing\n" );
}
ret = of_property_read_u32(np, "arm,prefetch-offset" , &val);
if (ret == 0 ) {
prefetch &= ~L310_PREFETCH_CTRL_OFFSET_MASK;
prefetch |= val & L310_PREFETCH_CTRL_OFFSET_MASK;
} else if (ret != -EINVAL) {
pr_err("L2C-310 OF arm,prefetch-offset property value is missing\n" );
}
ret = of_property_read_u32(np, "prefetch-data" , &val);
if (ret == 0 ) {
if (val) {
prefetch |= L310_PREFETCH_CTRL_DATA_PREFETCH;
*aux_val |= L310_PREFETCH_CTRL_DATA_PREFETCH;
} else {
prefetch &= ~L310_PREFETCH_CTRL_DATA_PREFETCH;
*aux_val &= ~L310_PREFETCH_CTRL_DATA_PREFETCH;
}
*aux_mask &= ~L310_PREFETCH_CTRL_DATA_PREFETCH;
} else if (ret != -EINVAL) {
pr_err("L2C-310 OF prefetch-data property value is missing\n" );
}
ret = of_property_read_u32(np, "prefetch-instr" , &val);
if (ret == 0 ) {
if (val) {
prefetch |= L310_PREFETCH_CTRL_INSTR_PREFETCH;
*aux_val |= L310_PREFETCH_CTRL_INSTR_PREFETCH;
} else {
prefetch &= ~L310_PREFETCH_CTRL_INSTR_PREFETCH;
*aux_val &= ~L310_PREFETCH_CTRL_INSTR_PREFETCH;
}
*aux_mask &= ~L310_PREFETCH_CTRL_INSTR_PREFETCH;
} else if (ret != -EINVAL) {
pr_err("L2C-310 OF prefetch-instr property value is missing\n" );
}
l2x0_saved_regs.prefetch_ctrl = prefetch;
power = l2x0_saved_regs.pwr_ctrl |
L310_DYNAMIC_CLK_GATING_EN | L310_STNDBY_MODE_EN;
ret = of_property_read_u32(np, "arm,dynamic-clock-gating" , &val);
if (!ret) {
if (!val)
power &= ~L310_DYNAMIC_CLK_GATING_EN;
} else if (ret != -EINVAL) {
pr_err("L2C-310 OF dynamic-clock-gating property value is missing or invalid\n" );
}
ret = of_property_read_u32(np, "arm,standby-mode" , &val);
if (!ret) {
if (!val)
power &= ~L310_STNDBY_MODE_EN;
} else if (ret != -EINVAL) {
pr_err("L2C-310 OF standby-mode property value is missing or invalid\n" );
}
l2x0_saved_regs.pwr_ctrl = power;
}
static const struct l2c_init_data of_l2c310_data __initconst = {
.type = "L2C-310" ,
.way_size_0 = SZ_8K,
.num_lock = 8 ,
.of_parse = l2c310_of_parse,
.enable = l2c310_enable,
.fixup = l2c310_fixup,
.save = l2c310_save,
.configure = l2c310_configure,
.unlock = l2c310_unlock,
.outer_cache = {
.inv_range = l2c210_inv_range,
.clean_range = l2c210_clean_range,
.flush_range = l2c210_flush_range,
.flush_all = l2c210_flush_all,
.disable = l2c310_disable,
.sync = l2c210_sync,
.resume = l2c310_resume,
},
};
/*
* This is a variant of the of_l2c310_data with . sync set to
* NULL . Outer sync operations are not needed when the system is I / O
* coherent , and potentially harmful in certain situations ( PCIe / PL310
* deadlock on Armada 375 / 38 x due to hardware I / O coherency ) . The
* other operations are kept because they are infrequent ( therefore do
* not cause the deadlock in practice ) and needed for secondary CPU
* boot and other power management activities .
*/
static const struct l2c_init_data of_l2c310_coherent_data __initconst = {
.type = "L2C-310 Coherent" ,
.way_size_0 = SZ_8K,
.num_lock = 8 ,
.of_parse = l2c310_of_parse,
.enable = l2c310_enable,
.fixup = l2c310_fixup,
.save = l2c310_save,
.configure = l2c310_configure,
.unlock = l2c310_unlock,
.outer_cache = {
.inv_range = l2c210_inv_range,
.clean_range = l2c210_clean_range,
.flush_range = l2c210_flush_range,
.flush_all = l2c210_flush_all,
.disable = l2c310_disable,
.resume = l2c310_resume,
},
};
/*
* Note that the end addresses passed to Linux primitives are
* noninclusive , while the hardware cache range operations use
* inclusive start and end addresses .
*/
static unsigned long aurora_range_end(unsigned long start, unsigned long end)
{
/*
* Limit the number of cache lines processed at once ,
* since cache range operations stall the CPU pipeline
* until completion .
*/
if (end > start + AURORA_MAX_RANGE_SIZE)
end = start + AURORA_MAX_RANGE_SIZE;
/*
* Cache range operations can ' t straddle a page boundary .
*/
if (end > PAGE_ALIGN(start+1 ))
end = PAGE_ALIGN(start+1 );
return end;
}
static void aurora_pa_range(unsigned long start, unsigned long end,
unsigned long offset)
{
void __iomem *base = l2x0_base;
unsigned long range_end;
unsigned long flags;
/*
* round start and end adresses up to cache line size
*/
start &= ~(CACHE_LINE_SIZE - 1 );
end = ALIGN(end, CACHE_LINE_SIZE);
/*
* perform operation on all full cache lines between ' start ' and ' end '
*/
while (start < end) {
range_end = aurora_range_end(start, end);
raw_spin_lock_irqsave(&l2x0_lock, flags);
writel_relaxed(start, base + AURORA_RANGE_BASE_ADDR_REG);
writel_relaxed(range_end - CACHE_LINE_SIZE, base + offset);
raw_spin_unlock_irqrestore(&l2x0_lock, flags);
writel_relaxed(0 , base + AURORA_SYNC_REG);
start = range_end;
}
}
static void aurora_inv_range(unsigned long start, unsigned long end)
{
aurora_pa_range(start, end, AURORA_INVAL_RANGE_REG);
}
static void aurora_clean_range(unsigned long start, unsigned long end)
{
/*
* If L2 is forced to WT , the L2 will always be clean and we
* don ' t need to do anything here .
*/
if (!l2_wt_override)
aurora_pa_range(start, end, AURORA_CLEAN_RANGE_REG);
}
static void aurora_flush_range(unsigned long start, unsigned long end)
{
if (l2_wt_override)
aurora_pa_range(start, end, AURORA_INVAL_RANGE_REG);
else
aurora_pa_range(start, end, AURORA_FLUSH_RANGE_REG);
}
static void aurora_flush_all(void )
{
void __iomem *base = l2x0_base;
unsigned long flags;
/* clean all ways */
raw_spin_lock_irqsave(&l2x0_lock, flags);
__l2c_op_way(base + L2X0_CLEAN_INV_WAY);
raw_spin_unlock_irqrestore(&l2x0_lock, flags);
writel_relaxed(0 , base + AURORA_SYNC_REG);
}
static void aurora_cache_sync(void )
{
writel_relaxed(0 , l2x0_base + AURORA_SYNC_REG);
}
static void aurora_disable(void )
{
void __iomem *base = l2x0_base;
unsigned long flags;
raw_spin_lock_irqsave(&l2x0_lock, flags);
__l2c_op_way(base + L2X0_CLEAN_INV_WAY);
writel_relaxed(0 , base + AURORA_SYNC_REG);
l2c_write_sec(0 , base, L2X0_CTRL);
dsb(st);
raw_spin_unlock_irqrestore(&l2x0_lock, flags);
}
static void aurora_save(void __iomem *base)
{
l2x0_saved_regs.ctrl = readl_relaxed(base + L2X0_CTRL);
l2x0_saved_regs.aux_ctrl = readl_relaxed(base + L2X0_AUX_CTRL);
}
/*
* For Aurora cache in no outer mode , enable via the CP15 coprocessor
* broadcasting of cache commands to L2 .
*/
static void __init aurora_enable_no_outer(void __iomem *base,
unsigned num_lock)
{
u32 u;
asm volatile ("mrc p15, 1, %0, c15, c2, 0" : "=r" (u));
u |= AURORA_CTRL_FW; /* Set the FW bit */
asm volatile ("mcr p15, 1, %0, c15, c2, 0" : : "r" (u));
isb();
l2c_enable(base, num_lock);
}
static void __init aurora_fixup(void __iomem *base, u32 cache_id,
struct outer_cache_fns *fns)
{
sync_reg_offset = AURORA_SYNC_REG;
}
static void __init aurora_of_parse(const struct device_node *np,
u32 *aux_val, u32 *aux_mask)
{
u32 val = AURORA_ACR_REPLACEMENT_TYPE_SEMIPLRU;
u32 mask = AURORA_ACR_REPLACEMENT_MASK;
of_property_read_u32(np, "cache-id-part" ,
&cache_id_part_number_from_dt);
/* Determine and save the write policy */
l2_wt_override = of_property_read_bool(np, "wt-override" );
if (l2_wt_override) {
val |= AURORA_ACR_FORCE_WRITE_THRO_POLICY;
mask |= AURORA_ACR_FORCE_WRITE_POLICY_MASK;
}
if (of_property_read_bool(np, "marvell,ecc-enable" )) {
mask |= AURORA_ACR_ECC_EN;
val |= AURORA_ACR_ECC_EN;
}
if (of_property_read_bool(np, "arm,parity-enable" )) {
mask |= AURORA_ACR_PARITY_EN;
val |= AURORA_ACR_PARITY_EN;
} else if (of_property_read_bool(np, "arm,parity-disable" )) {
mask |= AURORA_ACR_PARITY_EN;
}
*aux_val &= ~mask;
*aux_val |= val;
*aux_mask &= ~mask;
}
static const struct l2c_init_data of_aurora_with_outer_data __initconst = {
.type = "Aurora" ,
.way_size_0 = SZ_4K,
.num_lock = 4 ,
.of_parse = aurora_of_parse,
.enable = l2c_enable,
.fixup = aurora_fixup,
.save = aurora_save,
.configure = l2c_configure,
.unlock = l2c_unlock,
.outer_cache = {
.inv_range = aurora_inv_range,
.clean_range = aurora_clean_range,
.flush_range = aurora_flush_range,
.flush_all = aurora_flush_all,
.disable = aurora_disable,
.sync = aurora_cache_sync,
.resume = l2c_resume,
},
};
static const struct l2c_init_data of_aurora_no_outer_data __initconst = {
.type = "Aurora" ,
.way_size_0 = SZ_4K,
.num_lock = 4 ,
.of_parse = aurora_of_parse,
.enable = aurora_enable_no_outer,
.fixup = aurora_fixup,
.save = aurora_save,
.configure = l2c_configure,
.unlock = l2c_unlock,
.outer_cache = {
.resume = l2c_resume,
},
};
/*
* For certain Broadcom SoCs , depending on the address range , different offsets
* need to be added to the address before passing it to L2 for
* invalidation / clean / flush
*
* Section Address Range Offset EMI
* 1 0 x00000000 - 0 x3FFFFFFF 0 x80000000 VC
* 2 0 x40000000 - 0 xBFFFFFFF 0 x40000000 SYS
* 3 0 xC0000000 - 0 xFFFFFFFF 0 x80000000 VC
*
* When the start and end addresses have crossed two different sections , we
* need to break the L2 operation into two , each within its own section .
* For example , if we need to invalidate addresses starts at 0 xBFFF0000 and
* ends at 0 xC0001000 , we need do invalidate 1 ) 0 xBFFF0000 - 0 xBFFFFFFF and 2 )
* 0 xC0000000 - 0 xC0001000
*
* Note 1 :
* By breaking a single L2 operation into two , we may potentially suffer some
* performance hit , but keep in mind the cross section case is very rare
*
* Note 2 :
* We do not need to handle the case when the start address is in
* Section 1 and the end address is in Section 3 , since it is not a valid use
* case
*
* Note 3 :
* Section 1 in practical terms can no longer be used on rev A2 . Because of
* that the code does not need to handle section 1 at all .
*
*/
#define BCM_SYS_EMI_START_ADDR 0 x40000000UL
#define BCM_VC_EMI_SEC3_START_ADDR 0 xC0000000UL
#define BCM_SYS_EMI_OFFSET 0 x40000000UL
#define BCM_VC_EMI_OFFSET 0 x80000000UL
static inline int bcm_addr_is_sys_emi(unsigned long addr)
{
return (addr >= BCM_SYS_EMI_START_ADDR) &&
(addr < BCM_VC_EMI_SEC3_START_ADDR);
}
static inline unsigned long bcm_l2_phys_addr(unsigned long addr)
{
if (bcm_addr_is_sys_emi(addr))
return addr + BCM_SYS_EMI_OFFSET;
else
return addr + BCM_VC_EMI_OFFSET;
}
static void bcm_inv_range(unsigned long start, unsigned long end)
{
unsigned long new_start, new_end;
BUG_ON(start < BCM_SYS_EMI_START_ADDR);
if (unlikely(end <= start))
return ;
new_start = bcm_l2_phys_addr(start);
new_end = bcm_l2_phys_addr(end);
/* normal case, no cross section between start and end */
if (likely(bcm_addr_is_sys_emi(end) || !bcm_addr_is_sys_emi(start))) {
l2c210_inv_range(new_start, new_end);
return ;
}
/* They cross sections, so it can only be a cross from section
* 2 to section 3
*/
l2c210_inv_range(new_start,
bcm_l2_phys_addr(BCM_VC_EMI_SEC3_START_ADDR-1 ));
l2c210_inv_range(bcm_l2_phys_addr(BCM_VC_EMI_SEC3_START_ADDR),
new_end);
}
static void bcm_clean_range(unsigned long start, unsigned long end)
{
unsigned long new_start, new_end;
BUG_ON(start < BCM_SYS_EMI_START_ADDR);
if (unlikely(end <= start))
return ;
new_start = bcm_l2_phys_addr(start);
new_end = bcm_l2_phys_addr(end);
/* normal case, no cross section between start and end */
if (likely(bcm_addr_is_sys_emi(end) || !bcm_addr_is_sys_emi(start))) {
l2c210_clean_range(new_start, new_end);
return ;
}
/* They cross sections, so it can only be a cross from section
* 2 to section 3
*/
l2c210_clean_range(new_start,
bcm_l2_phys_addr(BCM_VC_EMI_SEC3_START_ADDR-1 ));
l2c210_clean_range(bcm_l2_phys_addr(BCM_VC_EMI_SEC3_START_ADDR),
new_end);
}
static void bcm_flush_range(unsigned long start, unsigned long end)
{
unsigned long new_start, new_end;
BUG_ON(start < BCM_SYS_EMI_START_ADDR);
if (unlikely(end <= start))
return ;
if ((end - start) >= l2x0_size) {
outer_cache.flush_all();
return ;
}
new_start = bcm_l2_phys_addr(start);
new_end = bcm_l2_phys_addr(end);
/* normal case, no cross section between start and end */
if (likely(bcm_addr_is_sys_emi(end) || !bcm_addr_is_sys_emi(start))) {
l2c210_flush_range(new_start, new_end);
return ;
}
/* They cross sections, so it can only be a cross from section
* 2 to section 3
*/
l2c210_flush_range(new_start,
bcm_l2_phys_addr(BCM_VC_EMI_SEC3_START_ADDR-1 ));
l2c210_flush_range(bcm_l2_phys_addr(BCM_VC_EMI_SEC3_START_ADDR),
new_end);
}
/* Broadcom L2C-310 start from ARMs R3P2 or later, and require no fixups */
static const struct l2c_init_data of_bcm_l2x0_data __initconst = {
.type = "BCM-L2C-310" ,
.way_size_0 = SZ_8K,
.num_lock = 8 ,
.of_parse = l2c310_of_parse,
.enable = l2c310_enable,
.save = l2c310_save,
.configure = l2c310_configure,
.unlock = l2c310_unlock,
.outer_cache = {
.inv_range = bcm_inv_range,
.clean_range = bcm_clean_range,
.flush_range = bcm_flush_range,
.flush_all = l2c210_flush_all,
.disable = l2c310_disable,
.sync = l2c210_sync,
.resume = l2c310_resume,
},
};
static void __init tauros3_save(void __iomem *base)
{
l2c_save(base);
l2x0_saved_regs.aux2_ctrl =
readl_relaxed(base + TAUROS3_AUX2_CTRL);
l2x0_saved_regs.prefetch_ctrl =
readl_relaxed(base + L310_PREFETCH_CTRL);
}
static void tauros3_configure(void __iomem *base)
{
l2c_configure(base);
writel_relaxed(l2x0_saved_regs.aux2_ctrl,
base + TAUROS3_AUX2_CTRL);
writel_relaxed(l2x0_saved_regs.prefetch_ctrl,
base + L310_PREFETCH_CTRL);
}
static const struct l2c_init_data of_tauros3_data __initconst = {
.type = "Tauros3" ,
.way_size_0 = SZ_8K,
.num_lock = 8 ,
.enable = l2c_enable,
.save = tauros3_save,
.configure = tauros3_configure,
.unlock = l2c_unlock,
/* Tauros3 broadcasts L1 cache operations to L2 */
.outer_cache = {
.resume = l2c_resume,
},
};
#define L2C_ID(name, fns) { .compatible = name, .data = (void *)&fns }
static const struct of_device_id l2x0_ids[] __initconst = {
L2C_ID("arm,l210-cache" , of_l2c210_data),
L2C_ID("arm,l220-cache" , of_l2c220_data),
L2C_ID("arm,pl310-cache" , of_l2c310_data),
L2C_ID("brcm,bcm11351-a2-pl310-cache" , of_bcm_l2x0_data),
L2C_ID("marvell,aurora-outer-cache" , of_aurora_with_outer_data),
L2C_ID("marvell,aurora-system-cache" , of_aurora_no_outer_data),
L2C_ID("marvell,tauros3-cache" , of_tauros3_data),
/* Deprecated IDs */
L2C_ID("bcm,bcm11351-a2-pl310-cache" , of_bcm_l2x0_data),
{}
};
int __init l2x0_of_init(u32 aux_val, u32 aux_mask)
{
const struct l2c_init_data *data;
struct device_node *np;
struct resource res;
u32 cache_id, old_aux;
u32 cache_level = 2 ;
bool nosync = false ;
np = of_find_matching_node(NULL, l2x0_ids);
if (!np)
return -ENODEV;
if (of_address_to_resource(np, 0 , &res))
return -ENODEV;
l2x0_base = ioremap(res.start, resource_size(&res));
if (!l2x0_base)
return -ENOMEM;
l2x0_saved_regs.phy_base = res.start;
data = of_match_node(l2x0_ids, np)->data;
if (of_device_is_compatible(np, "arm,pl310-cache" ) &&
of_property_read_bool(np, "arm,io-coherent" ))
data = &of_l2c310_coherent_data;
old_aux = readl_relaxed(l2x0_base + L2X0_AUX_CTRL);
if (old_aux != ((old_aux & aux_mask) | aux_val)) {
pr_warn("L2C: platform modifies aux control register: 0x%08x -> 0x%08x\n" ,
old_aux, (old_aux & aux_mask) | aux_val);
} else if (aux_mask != ~0 U && aux_val != 0 ) {
pr_alert("L2C: platform provided aux values match the hardware, so have no effect. Please remove them.\n" );
}
/* All L2 caches are unified, so this property should be specified */
if (!of_property_read_bool(np, "cache-unified" ))
pr_err("L2C: device tree omits to specify unified cache\n" );
if (of_property_read_u32(np, "cache-level" , &cache_level))
pr_err("L2C: device tree omits to specify cache-level\n" );
if (cache_level != 2 )
pr_err("L2C: device tree specifies invalid cache level\n" );
nosync = of_property_read_bool(np, "arm,outer-sync-disable" );
/* Read back current (default) hardware configuration */
if (data->save)
data->save(l2x0_base);
/* L2 configuration can only be changed if the cache is disabled */
if (!(readl_relaxed(l2x0_base + L2X0_CTRL) & L2X0_CTRL_EN))
if (data->of_parse)
data->of_parse(np, &aux_val, &aux_mask);
if (cache_id_part_number_from_dt)
cache_id = cache_id_part_number_from_dt;
else
cache_id = readl_relaxed(l2x0_base + L2X0_CACHE_ID);
return __l2c_init(data, aux_val, aux_mask, cache_id, nosync);
}
#endif
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