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ARM: 5919/1: ARM: L2 : Errata 588369: Clean & Invalidate do not invalidate clean lines

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This patch implements the work-around for the errata 588369.The secure
API is used to alter L2 debug register because of trust-zone.

This version updated with comments from Russell and Catalin and
generated against 2.6.33-rc6 mainline kernel. Detail
comments can be found:
http://www.spinics.net/lists/linux-omap/msg23431.html

Signed-off-by: Woodruff Richard <r-woodruff2@ti.com>
Signed-off-by: Santosh Shilimkar <santosh.shilimkar@ti.com>
Acked-by: Catalin Marinas <catalin.marinas@arm.com>
Acked-by: Tony Lindgren <tony@atomide.com>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
This commit is contained in:
Santosh Shilimkar 2010-02-04 19:42:42 +01:00 committed by Russell King
parent d309427e79
commit 9e65582a8e
2 changed files with 49 additions and 0 deletions
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13
arch/arm/Kconfig
View file

@ -924,6 +924,19 @@ config ARM_ERRATA_460075
ACTLR register. Note that setting specific bits in the ACTLR register
may not be available in non-secure mode.
config PL310_ERRATA_588369
bool "Clean & Invalidate maintenance operations do not invalidate clean lines"
depends on CACHE_L2X0 && ARCH_OMAP4
help
The PL310 L2 cache controller implements three types of Clean &
Invalidate maintenance operations: by Physical Address
(offset 0x7F0), by Index/Way (0x7F8) and by Way (0x7FC).
They are architecturally defined to behave as the execution of a
clean operation followed immediately by an invalidate operation,
both performing to the same memory location. This functionality
is not correctly implemented in PL310 as clean lines are not
invalidated as a result of these operations. Note that this errata
uses Texas Instrument's secure monitor api.
endmenu
source "arch/arm/common/Kconfig"

36
arch/arm/mm/cache-l2x0.c
View file

@ -56,12 +56,42 @@ static inline void l2x0_inv_line(unsigned long addr)
writel(addr, base + L2X0_INV_LINE_PA);
}
#ifdef CONFIG_PL310_ERRATA_588369
static void debug_writel(unsigned long val)
{
extern void omap_smc1(u32 fn, u32 arg);
/*
* Texas Instrument secure monitor api to modify the
* PL310 Debug Control Register.
*/
omap_smc1(0x100, val);
}
static inline void l2x0_flush_line(unsigned long addr)
{
void __iomem *base = l2x0_base;
/* Clean by PA followed by Invalidate by PA */
cache_wait(base + L2X0_CLEAN_LINE_PA, 1);
writel(addr, base + L2X0_CLEAN_LINE_PA);
cache_wait(base + L2X0_INV_LINE_PA, 1);
writel(addr, base + L2X0_INV_LINE_PA);
}
#else
/* Optimised out for non-errata case */
static inline void debug_writel(unsigned long val)
{
}
static inline void l2x0_flush_line(unsigned long addr)
{
void __iomem *base = l2x0_base;
cache_wait(base + L2X0_CLEAN_INV_LINE_PA, 1);
writel(addr, base + L2X0_CLEAN_INV_LINE_PA);
}
#endif
static inline void l2x0_inv_all(void)
{
@ -83,13 +113,17 @@ static void l2x0_inv_range(unsigned long start, unsigned long end)
spin_lock_irqsave(&l2x0_lock, flags);
if (start & (CACHE_LINE_SIZE - 1)) {
start &= ~(CACHE_LINE_SIZE - 1);
debug_writel(0x03);
l2x0_flush_line(start);
debug_writel(0x00);
start += CACHE_LINE_SIZE;
}
if (end & (CACHE_LINE_SIZE - 1)) {
end &= ~(CACHE_LINE_SIZE - 1);
debug_writel(0x03);
l2x0_flush_line(end);
debug_writel(0x00);
}
while (start < end) {
@ -145,10 +179,12 @@ static void l2x0_flush_range(unsigned long start, unsigned long end)
while (start < end) {
unsigned long blk_end = start + min(end - start, 4096UL);
debug_writel(0x03);
while (start < blk_end) {
l2x0_flush_line(start);
start += CACHE_LINE_SIZE;
}
debug_writel(0x00);
if (blk_end < end) {
spin_unlock_irqrestore(&l2x0_lock, flags);