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ARM: l2c: add L2C-210 specific handlers 

Add L2C-210 specific cache operation handlers.  These are tailored to
the requirements of the L2C-210 cache controller, which doesn't
require any workarounds.  We avoid using the way operations during
normal operation, which means we can avoid locking: the only time
we use the way operations are during initialisation, and when
disabling the cache.

Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
This commit is contained in:
Russell King 2014-03-15 18:55:53 +00:00
parent bda0b74e6a
commit 6a28cf59ff
1 changed files with 122 additions and 1 deletions
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123
arch/arm/mm/cache-l2x0.c
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@ -388,6 +388,108 @@ static const struct l2c_init_data l2x0_init_fns __initconst = {
},
};
/*
* L2C-210 specific code.
*
* The L2C-2x0 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 void l2c210_resume(void)
{
void __iomem *base = l2x0_base;
if (!(readl_relaxed(base + L2X0_CTRL) & L2X0_CTRL_EN))
l2c_enable(base, l2x0_saved_regs.aux_ctrl, 1);
}
static const struct l2c_init_data l2c210_data __initconst = {
.num_lock = 1,
.enable = l2c_enable,
.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 = l2c210_resume,
},
};
/*
* L2C-310 specific code.
*
@ -623,6 +725,10 @@ void __init l2x0_init(void __iomem *base, u32 aux_val, u32 aux_mask)
data = &l2x0_init_fns;
break;
case L2X0_CACHE_ID_PART_L210:
data = &l2c210_data;
break;
case L2X0_CACHE_ID_PART_L310:
data = &l2c310_init_fns;
break;
@ -672,6 +778,21 @@ static void __init l2x0_of_parse(const struct device_node *np,
*aux_mask &= ~mask;
}
static const struct l2c_init_data of_l2c210_data __initconst = {
.num_lock = 1,
.of_parse = l2x0_of_parse,
.enable = l2c_enable,
.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 = l2c210_resume,
},
};
static const struct l2c_init_data of_l2x0_data __initconst = {
.of_parse = l2x0_of_parse,
.enable = l2x0_enable,
@ -1117,7 +1238,7 @@ static const struct l2c_init_data of_tauros3_data __initconst = {
#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_l2x0_data),
L2C_ID("arm,l210-cache", of_l2c210_data),
L2C_ID("arm,l220-cache", of_l2x0_data),
L2C_ID("arm,pl310-cache", of_pl310_data),
L2C_ID("brcm,bcm11351-a2-pl310-cache", of_bcm_l2x0_data),