Russell King - ARM Linux <linux@xxxxxxxxxxxxxxxx> writes:
> On Wed, Jun 29, 2011 at 10:29:49AM -0700, Kevin Hilman wrote:
>> Russell, if you're OK with it, can you add it to your suspend branch for
>> the upcoming merge window?
>
> Yes - though I think we can go a little bit further - this patch is on
> top of my code so far, and is untested. There isn't a need for the
> saving of these registers to be in assembly because we can read them
> just as easily from C code.
Indeed
> Comments?
Looks good to me (although untested) care to respin on top of $SUBJECT
patch?
Minor comments below...
> arch/arm/mach-omap2/pm.h | 2 +-
> arch/arm/mach-omap2/pm34xx.c | 19 +++++++++++++++++--
> arch/arm/mach-omap2/sleep34xx.S | 12 ++----------
> 3 files changed, 20 insertions(+), 13 deletions(-)
>
> diff --git a/arch/arm/mach-omap2/pm.h b/arch/arm/mach-omap2/pm.h
> index 45bcfce..4984cca 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 omap34xx_cpu_suspend(int save_state);
> extern int save_secure_ram_context(u32 *addr);
> extern void omap3_save_scratchpad_contents(void);
>
> diff --git a/arch/arm/mach-omap2/pm34xx.c b/arch/arm/mach-omap2/pm34xx.c
> index 3e9a13e..6366352 100644
> --- a/arch/arm/mach-omap2/pm34xx.c
> +++ b/arch/arm/mach-omap2/pm34xx.c
> @@ -78,7 +78,7 @@ struct power_state {
>
> static LIST_HEAD(pwrst_list);
>
> -static void (*_omap_sram_idle)(u32 *addr, int save_state);
> +static void (*_omap_sram_idle)(int save_state);
>
> static int (*_omap_save_secure_sram)(u32 *addr);
>
> @@ -307,9 +307,22 @@ static irqreturn_t prcm_interrupt_handler (int irq, void *dev_id)
> return IRQ_HANDLED;
> }
>
> +static void omap34xx_save_context(u32 *save)
> +{
> + u32 val;
> +
> + asm("mrc p15, 0, %0, c1, c0, 1" : "=r" (val));
Minor: for those of us who don't have all these registers memorized when
looking at the assembly, maybe keeping the original comments (e.g. "Read
AUX
> + *save++ = 1;
> + *save++ = val;
> +
> + asm("mrc p15, 1, %0, c9, c0, 2" : "=r" (val));
> + *save++ = 1;
> + *save++ = val;
> +}
> +
> static void omap34xx_do_sram_idle(unsigned long save_state)
> {
> - _omap_sram_idle(omap3_arm_context, save_state);
> + _omap_sram_idle(save_state);
> }
>
> void omap_sram_idle(void)
> @@ -412,6 +425,8 @@ void omap_sram_idle(void)
> * get saved. The rest is placed on the stack, and restored
> * from there before resuming.
> */
> + if (save_state)
> + omap34xx_save_context(omap3_arm_context);
> if (save_state == 1 || save_state == 3)
> cpu_suspend(save_state, omap34xx_do_sram_idle);
> else
> diff --git a/arch/arm/mach-omap2/sleep34xx.S b/arch/arm/mach-omap2/sleep34xx.S
> index d18f52e..3335753 100644
> --- a/arch/arm/mach-omap2/sleep34xx.S
> +++ b/arch/arm/mach-omap2/sleep34xx.S
> @@ -150,8 +150,7 @@ ENTRY(omap34xx_cpu_suspend)
> stmfd sp!, {r4 - r11, lr} @ save registers on stack
>
> /*
> - * r0 contains CPU context save/restore pointer in sdram
> - * r1 contains information about saving context:
> + * r0 contains information about saving context:
> * 0 - No context lost
> * 1 - Only L1 and logic lost
> * 2 - Only L2 lost (Even L1 is retained we clean it along with L2)
> @@ -159,18 +158,11 @@ ENTRY(omap34xx_cpu_suspend)
> */
>
> /* Directly jump to WFI is the context save is not required */
> - cmp r1, #0x0
> + cmp r0, #0x0
> beq omap3_do_wfi
>
> /* Otherwise fall through to the save context code */
> save_context_wfi:
> - mov r8, r0 @ Store SDRAM address in r8
> - mrc p15, 0, r5, c1, c0, 1 @ Read Auxiliary Control Register
> - mov r4, #0x1 @ Number of parameters for restore call
> - stmia r8!, {r4-r5} @ Push parameters for restore call
> - mrc p15, 1, r5, c9, c0, 2 @ Read L2 AUX ctrl register
> - stmia r8!, {r4-r5} @ Push parameters for restore call
> -
> /*
> * jump out to kernel flush routine
> * - reuse that code is better
--
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