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ARM: OMAP: Introduce common omap_map_sram() and omap_sram_reset() 

This will allow us to separate out omap1 and omap2+ specific
code in the later patches.

Signed-off-by: Tony Lindgren <tony@atomide.com>
This commit is contained in:
Tony Lindgren 2012-10-29 14:36:25 -07:00
parent bf027ca137
commit d8cfd6c8b4
2 changed files with 46 additions and 22 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

4
arch/arm/plat-omap/include/plat/sram.h
View File

@ -1,5 +1,9 @@
int omap_sram_init(void);
void omap_map_sram(unsigned long start, unsigned long size,
unsigned long skip, int cached);
void omap_sram_reset(void);
extern void *omap_sram_push_address(unsigned long size);
/* Macro to push a function to the internal SRAM, using the fncpy API */

64
arch/arm/plat-omap/sram.c
View File

@ -170,13 +170,10 @@ static void __init omap_detect_sram(void)
/*
* Note that we cannot use ioremap for SRAM, as clock init needs SRAM early.
*/
static void __init omap_map_sram(void)
static void __init omap_fix_and_map_sram(void)
{
int cached = 1;
if (omap_sram_size == 0)
return;
#ifdef CONFIG_OMAP4_ERRATA_I688
if (cpu_is_omap44xx()) {
omap_sram_start += PAGE_SIZE;
@ -194,22 +191,8 @@ static void __init omap_map_sram(void)
cached = 0;
}
omap_sram_start = ROUND_DOWN(omap_sram_start, PAGE_SIZE);
omap_sram_base = __arm_ioremap_exec(omap_sram_start, omap_sram_size,
cached);
if (!omap_sram_base) {
pr_err("SRAM: Could not map\n");
return;
}
omap_sram_ceil = omap_sram_base + omap_sram_size;
/*
* Looks like we need to preserve some bootloader code at the
* beginning of SRAM for jumping to flash for reboot to work...
*/
memset_io(omap_sram_base + omap_sram_skip, 0,
omap_sram_size - omap_sram_skip);
omap_map_sram(omap_sram_start, omap_sram_size,
omap_sram_skip, cached);
}
/*
@ -237,6 +220,43 @@ void *omap_sram_push_address(unsigned long size)
return (void *)omap_sram_ceil;
}
/*
* The SRAM context is lost during off-idle and stack
* needs to be reset.
*/
void omap_sram_reset(void)
{
omap_sram_ceil = omap_sram_base + omap_sram_size;
}
/*
* Note that we cannot use ioremap for SRAM, as clock init needs SRAM early.
*/
void __init omap_map_sram(unsigned long start, unsigned long size,
unsigned long skip, int cached)
{
if (size == 0)
return;
start = ROUND_DOWN(start, PAGE_SIZE);
omap_sram_size = size;
omap_sram_skip = skip;
omap_sram_base = __arm_ioremap_exec(start, size, cached);
if (!omap_sram_base) {
pr_err("SRAM: Could not map\n");
return;
}
omap_sram_reset();
/*
* Looks like we need to preserve some bootloader code at the
* beginning of SRAM for jumping to flash for reboot to work...
*/
memset_io(omap_sram_base + omap_sram_skip, 0,
omap_sram_size - omap_sram_skip);
}
#ifdef CONFIG_ARCH_OMAP1
static void (*_omap_sram_reprogram_clock)(u32 dpllctl, u32 ckctl);
@ -362,7 +382,7 @@ u32 omap3_configure_core_dpll(u32 m2, u32 unlock_dll, u32 f, u32 inc,
void omap3_sram_restore_context(void)
{
omap_sram_ceil = omap_sram_base + omap_sram_size;
omap_sram_reset();
_omap3_sram_configure_core_dpll =
omap_sram_push(omap3_sram_configure_core_dpll,
@ -390,7 +410,7 @@ static inline int am33xx_sram_init(void)
int __init omap_sram_init(void)
{
omap_detect_sram();
omap_map_sram();
omap_fix_and_map_sram();
if (!(cpu_class_is_omap2()))
omap1_sram_init();