[PATCH v2] OMAP: use fncpy to copy the PM code functions to SRAM
Jean Pihet
jean.pihet at newoldbits.com
Mon Jan 24 12:25:09 EST 2011
Hi,
On Mon, Jan 24, 2011 at 5:11 PM, Dave Martin <dave.martin at linaro.org> wrote:
> Hi there, I just spotted a couple of things merging your patch...
>
> On Tue, Jan 18, 2011 at 12:02 PM, <jean.pihet at newoldbits.com> wrote:
>> From: Jean Pihet <j-pihet at ti.com>
>>
>> The new fncpy API is better suited for copying some
>> code to SRAM at runtime. This patch changes the ad-hoc
>> code to the more generic fncpy API.
>>
>> Tested OK on OMAP3 in low power modes (RET/OFF)
>> using omap2plus_defconfig with !CONFIG_THUMB2_KERNEL.
>> Compile tested on OMAP1/2 using omap1_defconfig.
>>
>> Signed-off-by: Jean Pihet <j-pihet at ti.com>
>> ---
>> arch/arm/mach-omap1/pm.h | 6 +++---
>> arch/arm/mach-omap1/sleep.S | 3 +++
>> arch/arm/mach-omap1/sram.S | 1 +
>> arch/arm/mach-omap2/pm.h | 2 +-
>> arch/arm/mach-omap2/sleep24xx.S | 2 ++
>> arch/arm/mach-omap2/sleep34xx.S | 2 ++
>> arch/arm/mach-omap2/sram242x.S | 3 +++
>> arch/arm/mach-omap2/sram243x.S | 3 +++
>> arch/arm/mach-omap2/sram34xx.S | 1 +
>> arch/arm/plat-omap/include/plat/sram.h | 14 +++++++++++++-
>> arch/arm/plat-omap/sram.c | 14 +++++++++-----
>> 11 files changed, 41 insertions(+), 10 deletions(-)
>>
>> diff --git a/arch/arm/mach-omap1/pm.h b/arch/arm/mach-omap1/pm.h
>> index 56a6479..cd926dc 100644
>> --- a/arch/arm/mach-omap1/pm.h
>> +++ b/arch/arm/mach-omap1/pm.h
>> @@ -123,9 +123,9 @@ extern void allow_idle_sleep(void);
>> extern void omap1_pm_idle(void);
>> extern void omap1_pm_suspend(void);
>>
>> -extern void omap7xx_cpu_suspend(unsigned short, unsigned short);
>> -extern void omap1510_cpu_suspend(unsigned short, unsigned short);
>> -extern void omap1610_cpu_suspend(unsigned short, unsigned short);
>> +extern void omap7xx_cpu_suspend(unsigned long, unsigned long);
>> +extern void omap1510_cpu_suspend(unsigned long, unsigned long);
>> +extern void omap1610_cpu_suspend(unsigned long, unsigned long);
>> extern void omap7xx_idle_loop_suspend(void);
>> extern void omap1510_idle_loop_suspend(void);
>> extern void omap1610_idle_loop_suspend(void);
>> diff --git a/arch/arm/mach-omap1/sleep.S b/arch/arm/mach-omap1/sleep.S
>> index ef771ce..c875bdc 100644
>> --- a/arch/arm/mach-omap1/sleep.S
>> +++ b/arch/arm/mach-omap1/sleep.S
>> @@ -58,6 +58,7 @@
>> */
>>
>> #if defined(CONFIG_ARCH_OMAP730) || defined(CONFIG_ARCH_OMAP850)
>> + .align 3
>> ENTRY(omap7xx_cpu_suspend)
>>
>> @ save registers on stack
>> @@ -137,6 +138,7 @@ ENTRY(omap7xx_cpu_suspend_sz)
>> #endif /* CONFIG_ARCH_OMAP730 || CONFIG_ARCH_OMAP850 */
>>
>> #ifdef CONFIG_ARCH_OMAP15XX
>> + .align 3
>> ENTRY(omap1510_cpu_suspend)
>>
>> @ save registers on stack
>> @@ -211,6 +213,7 @@ ENTRY(omap1510_cpu_suspend_sz)
>> #endif /* CONFIG_ARCH_OMAP15XX */
>>
>> #if defined(CONFIG_ARCH_OMAP16XX)
>> + .align 3
>> ENTRY(omap1610_cpu_suspend)
>>
>> @ save registers on stack
>> diff --git a/arch/arm/mach-omap1/sram.S b/arch/arm/mach-omap1/sram.S
>> index 7724e52..692587d 100644
>> --- a/arch/arm/mach-omap1/sram.S
>> +++ b/arch/arm/mach-omap1/sram.S
>> @@ -18,6 +18,7 @@
>> /*
>> * Reprograms ULPD and CKCTL.
>> */
>> + .align 3
>> ENTRY(omap1_sram_reprogram_clock)
>> stmfd sp!, {r0 - r12, lr} @ save registers on stack
>>
>> diff --git a/arch/arm/mach-omap2/pm.h b/arch/arm/mach-omap2/pm.h
>> index 1c1b0ab..39580e6 100644
>> --- a/arch/arm/mach-omap2/pm.h
>> +++ b/arch/arm/mach-omap2/pm.h
>> @@ -92,7 +92,7 @@ extern void omap24xx_idle_loop_suspend(void);
>> extern void omap24xx_cpu_suspend(u32 dll_ctrl, void __iomem *sdrc_dlla_ctrl,
>> void __iomem *sdrc_power);
>> extern void omap34xx_cpu_suspend(u32 *addr, int save_state);
>> -extern void save_secure_ram_context(u32 *addr);
>> +extern int save_secure_ram_context(u32 *addr);
>> extern void omap3_save_scratchpad_contents(void);
>>
>> extern unsigned int omap24xx_idle_loop_suspend_sz;
>> diff --git a/arch/arm/mach-omap2/sleep24xx.S b/arch/arm/mach-omap2/sleep24xx.S
>> index c7780cc..b5071a4 100644
>> --- a/arch/arm/mach-omap2/sleep24xx.S
>> +++ b/arch/arm/mach-omap2/sleep24xx.S
>> @@ -47,6 +47,7 @@
>> * Note: This code get's copied to internal SRAM at boot. When the OMAP
>> * wakes up it continues execution at the point it went to sleep.
>> */
>> + .align 3
>> ENTRY(omap24xx_idle_loop_suspend)
>> stmfd sp!, {r0, lr} @ save registers on stack
>> mov r0, #0 @ clear for mcr setup
>> @@ -82,6 +83,7 @@ ENTRY(omap24xx_idle_loop_suspend_sz)
>> * The DLL load value is not kept in RETENTION or OFF. It needs to be restored
>> * at wake
>> */
>> + .align 3
>> ENTRY(omap24xx_cpu_suspend)
>> stmfd sp!, {r0 - r12, lr} @ save registers on stack
>> mov r3, #0x0 @ clear for mcr call
>> diff --git a/arch/arm/mach-omap2/sleep34xx.S b/arch/arm/mach-omap2/sleep34xx.S
>> index 98d8232..951a0be 100644
>> --- a/arch/arm/mach-omap2/sleep34xx.S
>> +++ b/arch/arm/mach-omap2/sleep34xx.S
>> @@ -118,6 +118,7 @@ ENTRY(enable_omap3630_toggle_l2_on_restore)
>>
>> .text
>> /* Function to call rom code to save secure ram context */
>> + .align 3
>> ENTRY(save_secure_ram_context)
>> stmfd sp!, {r1-r12, lr} @ save registers on stack
>> adr r3, api_params @ r3 points to parameters
>> @@ -169,6 +170,7 @@ ENTRY(save_secure_ram_context_sz)
>> * depending on the low power mode (non-OFF vs OFF modes),
>> * cf. 'Resume path for xxx mode' comments.
>> */
>> + .align 3
>> ENTRY(omap34xx_cpu_suspend)
>> stmfd sp!, {r0-r12, lr} @ save registers on stack
>>
>> diff --git a/arch/arm/mach-omap2/sram242x.S b/arch/arm/mach-omap2/sram242x.S
>> index 055310c..ff9b9db 100644
>> --- a/arch/arm/mach-omap2/sram242x.S
>> +++ b/arch/arm/mach-omap2/sram242x.S
>> @@ -39,6 +39,7 @@
>>
>> .text
>>
>> + .align 3
>> ENTRY(omap242x_sram_ddr_init)
>> stmfd sp!, {r0 - r12, lr} @ save registers on stack
>>
>> @@ -143,6 +144,7 @@ ENTRY(omap242x_sram_ddr_init_sz)
>> * r0 = [PRCM_FULL | PRCM_HALF] r1 = SDRC_DLLA_CTRL value r2 = [DDR | SDR]
>> * PRCM_FULL = 2, PRCM_HALF = 1, DDR = 1, SDR = 0
>> */
>> + .align 3
>> ENTRY(omap242x_sram_reprogram_sdrc)
>> stmfd sp!, {r0 - r10, lr} @ save registers on stack
>> mov r3, #0x0 @ clear for mrc call
>> @@ -238,6 +240,7 @@ ENTRY(omap242x_sram_reprogram_sdrc_sz)
>> /*
>> * Set dividers and pll. Also recalculate DLL value for DDR and unlock mode.
>> */
>> + .align 3
>> ENTRY(omap242x_sram_set_prcm)
>> stmfd sp!, {r0-r12, lr} @ regs to stack
>> adr r4, pbegin @ addr of preload start
>> diff --git a/arch/arm/mach-omap2/sram243x.S b/arch/arm/mach-omap2/sram243x.S
>> index f900758..7673020 100644
>> --- a/arch/arm/mach-omap2/sram243x.S
>> +++ b/arch/arm/mach-omap2/sram243x.S
>> @@ -39,6 +39,7 @@
>>
>> .text
>>
>> + .align 3
>> ENTRY(omap243x_sram_ddr_init)
>> stmfd sp!, {r0 - r12, lr} @ save registers on stack
>>
>> @@ -143,6 +144,7 @@ ENTRY(omap243x_sram_ddr_init_sz)
>> * r0 = [PRCM_FULL | PRCM_HALF] r1 = SDRC_DLLA_CTRL value r2 = [DDR | SDR]
>> * PRCM_FULL = 2, PRCM_HALF = 1, DDR = 1, SDR = 0
>> */
>> + .align 3
>> ENTRY(omap243x_sram_reprogram_sdrc)
>> stmfd sp!, {r0 - r10, lr} @ save registers on stack
>> mov r3, #0x0 @ clear for mrc call
>> @@ -238,6 +240,7 @@ ENTRY(omap243x_sram_reprogram_sdrc_sz)
>> /*
>> * Set dividers and pll. Also recalculate DLL value for DDR and unlock mode.
>> */
>> + .align 3
>> ENTRY(omap243x_sram_set_prcm)
>> stmfd sp!, {r0-r12, lr} @ regs to stack
>> adr r4, pbegin @ addr of preload start
>> diff --git a/arch/arm/mach-omap2/sram34xx.S b/arch/arm/mach-omap2/sram34xx.S
>> index 7f893a2..25011ca 100644
>> --- a/arch/arm/mach-omap2/sram34xx.S
>> +++ b/arch/arm/mach-omap2/sram34xx.S
>> @@ -111,6 +111,7 @@
>> * since it will cause the ARM MMU to attempt to walk the page tables.
>> * These crashes may be intermittent.
>> */
>> + .align 3
>> ENTRY(omap3_sram_configure_core_dpll)
>> stmfd sp!, {r1-r12, lr} @ store regs to stack
>>
>> diff --git a/arch/arm/plat-omap/include/plat/sram.h b/arch/arm/plat-omap/include/plat/sram.h
>> index 9967d5e..d673f2c 100644
>> --- a/arch/arm/plat-omap/include/plat/sram.h
>> +++ b/arch/arm/plat-omap/include/plat/sram.h
>> @@ -12,7 +12,19 @@
>> #define __ARCH_ARM_OMAP_SRAM_H
>>
>> #ifndef __ASSEMBLY__
>> -extern void * omap_sram_push(void * start, unsigned long size);
>> +#include <asm/fncpy.h>
>> +
>> +extern void *omap_sram_push_address(unsigned long size);
>> +
>> +/* Macro to push a function to the internal SRAM, using the fncpy API */
>> +#define omap_sram_push(funcp, size) ({ \
>> + typeof(&funcp) _res = NULL; \
>
> 1) For fncpy() itself, I decided not to take the address of funcp
> inside the macro: the reason for this was that if you do this, the
> macro will silently do something silly if called with a function
> pointer instead of the function itself -- i.e., some memory starting
> at the stored function pointer itself will be copied instead of the
> function body.
>
> Forcing the caller to supply the '&' is a bit ugly, but I decided it
> was preferable from a safety standpoint.
>
> This doesn't necessarily mean that omap_sram_push can't add the '&',
> but if you do, you need to be careful how the macro is called. It
> will work for all existing uses of omap_sram_push, IIUC.
I am OK with that.
In the first place it was not obvious that the '&' was needed but the
compiler quickly reminded me about it. The type checking is one of the
advantages of the new API.
>
> 2) Should this be &(funcp)? This will only matter for pretty weird
> uses though. Currently most weird uses won't work properly anyway,
> because of (1). So this might not be much of a concern.
>
>> + void *_sram_address = omap_sram_push_address(size); \
>> + if (_sram_address) \
>> + _res = fncpy(_sram_address, &funcp, size); \
>
> &(funcp)
Yes that is correct but the current code does not have problem since
the functions to push have 'non-weird' types.
If needed I can change that.
>
> (see (2))
>
> Cheers
> ---Dave
>
Thanks,
Jean
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