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Date: Tue, 19 Oct 2010 15:06:24 -0700
From: Randy Dunlap <randy.dunlap@...cle.com>
To: Daniel Drake <dsd@...top.org>
Cc: tglx@...utronix.de, mingo@...hat.com, hpa@...or.com,
x86@...nel.org, dilinger@...ued.net, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] OLPC: Add XO-1 suspend/resume support
On Tue, 19 Oct 2010 23:01:58 +0100 (BST) Daniel Drake wrote:
> Add code needed for basic suspend/resume of the XO-1 laptop.
>
> swsusp_pg_dir needs to be exposed as it is used by the assembly
> code run in the wakeup path.
>
> Signed-off-by: Daniel Drake <dsd@...top.org>
> ---
> arch/x86/include/asm/olpc.h | 5 +-
> arch/x86/kernel/Makefile | 2 +-
> arch/x86/kernel/olpc-xo1-wakeup.S | 132 +++++++++++++++++++++++++++++++++++++
> arch/x86/kernel/olpc-xo1.c | 79 ++++++++++++++++++++++
> arch/x86/mm/init_32.c | 6 +-
> 5 files changed, 219 insertions(+), 5 deletions(-)
> create mode 100644 arch/x86/kernel/olpc-xo1-wakeup.S
>
> diff --git a/arch/x86/include/asm/olpc.h b/arch/x86/include/asm/olpc.h
> index 101229b..54dfe92 100644
> --- a/arch/x86/include/asm/olpc.h
> +++ b/arch/x86/include/asm/olpc.h
> @@ -88,7 +88,10 @@ extern int olpc_ec_mask_unset(uint8_t bits);
>
> /* EC commands */
>
> -#define EC_FIRMWARE_REV 0x08
> +#define EC_FIRMWARE_REV 0x08
> +#define EC_WAKE_UP_WLAN 0x24
> +#define EC_SET_SCI_INHIBIT 0x32
> +#define EC_SET_SCI_INHIBIT_RELEASE 0x34
>
> /* SCI source values */
>
> diff --git a/arch/x86/kernel/Makefile b/arch/x86/kernel/Makefile
> index 4983b61..1b23334 100644
> --- a/arch/x86/kernel/Makefile
> +++ b/arch/x86/kernel/Makefile
> @@ -106,7 +106,7 @@ obj-$(CONFIG_SCx200) += scx200.o
> scx200-y += scx200_32.o
>
> obj-$(CONFIG_OLPC) += olpc.o
> -obj-$(CONFIG_OLPC_XO1) += olpc-xo1.o
> +obj-$(CONFIG_OLPC_XO1) += olpc-xo1.o olpc-xo1-wakeup.o
> obj-$(CONFIG_OLPC_OPENFIRMWARE) += olpc_ofw.o
> obj-$(CONFIG_X86_MRST) += mrst.o
>
Hi,
Does this build OK when CONFIG_PM is not enabled?
or is that config not possible?
> diff --git a/arch/x86/kernel/olpc-xo1-wakeup.S b/arch/x86/kernel/olpc-xo1-wakeup.S
> new file mode 100644
> index 0000000..d335074
> --- /dev/null
> +++ b/arch/x86/kernel/olpc-xo1-wakeup.S
> @@ -0,0 +1,132 @@
> +.text
> +#include <linux/linkage.h>
> +#include <asm/segment.h>
> +#include <asm/page.h>
> +
> + .macro writepost,value
> + movb $0x34, %al
> + outb %al, $0x70
> + movb $\value, %al
> + outb %al, $0x71
> + .endm
> +
> +ALIGN
> + .align 4096
> +
> +wakeup_start:
> +# jmp wakeup_start
> +
> + cli
> + cld
> +
> + # Clear any dangerous flags
> +
> + pushl $0
> + popfl
> +
> + writepost 0x31
> +
> + # Set up %cr3
> + movl $swsusp_pg_dir - __PAGE_OFFSET, %eax
> + movl %eax, %cr3
> +
> + movl saved_cr4, %eax
> + movl %eax, %cr4
> +
> + movl saved_cr0, %eax
> + movl %eax, %cr0
> +
> + jmp 1f
> +1:
> + ljmpl $__KERNEL_CS,$wakeup_return
> +
> +
> +.org 0x1000
> +
> +wakeup_return:
> + movw $__KERNEL_DS, %ax
> + movw %ax, %ss
> + movw %ax, %ds
> + movw %ax, %es
> + movw %ax, %fs
> + movw %ax, %gs
> +
> + lgdt saved_gdt
> + lidt saved_idt
> + lldt saved_ldt
> + ljmp $(__KERNEL_CS),$1f
> +1:
> + movl %cr3, %eax
> + movl %eax, %cr3
> + wbinvd
> +
> + # Go back to the return point
> + jmp ret_point
> +
> +save_registers:
> + sgdt saved_gdt
> + sidt saved_idt
> + sldt saved_ldt
> +
> + pushl %edx
> + movl %cr4, %edx
> + movl %edx, saved_cr4
> +
> + movl %cr0, %edx
> + movl %edx, saved_cr0
> +
> + popl %edx
> +
> + movl %ebx, saved_context_ebx
> + movl %ebp, saved_context_ebp
> + movl %esi, saved_context_esi
> + movl %edi, saved_context_edi
> +
> + pushfl
> + popl saved_context_eflags
> +
> + ret
> +
> +
> +restore_registers:
> + movl saved_context_ebp, %ebp
> + movl saved_context_ebx, %ebx
> + movl saved_context_esi, %esi
> + movl saved_context_edi, %edi
> +
> + pushl saved_context_eflags
> + popfl
> +
> + ret
> +
> +
> +ENTRY(do_olpc_suspend_lowlevel)
> + call save_processor_state
> + call save_registers
> +
> + # This is the stack context we want to remember
> + movl %esp, saved_context_esp
> +
> + pushl $3
> + call olpc_xo1_do_sleep
> +
> + jmp wakeup_start
> + .p2align 4,,7
> +ret_point:
> + movl saved_context_esp, %esp
> +
> + writepost 0x32
> +
> + call restore_registers
> + call restore_processor_state
> + ret
> +
> +.data
> +ALIGN
> +
> +saved_gdt: .long 0,0
> +saved_idt: .long 0,0
> +saved_ldt: .long 0
> +saved_cr4: .long 0
> +saved_cr0: .long 0
> +
> diff --git a/arch/x86/kernel/olpc-xo1.c b/arch/x86/kernel/olpc-xo1.c
> index f5442c0..9a06081 100644
> --- a/arch/x86/kernel/olpc-xo1.c
> +++ b/arch/x86/kernel/olpc-xo1.c
> @@ -16,6 +16,7 @@
> #include <linux/pci_ids.h>
> #include <linux/platform_device.h>
> #include <linux/pm.h>
> +#include <linux/suspend.h>
>
> #include <asm/io.h>
> #include <asm/olpc.h>
> @@ -33,12 +34,83 @@
> #define PM_SSC 0x54
>
> /* PM registers (ACPI block) */
> +#define PM1_STS 0x00
> #define PM1_CNT 0x08
> #define PM_GPE0_STS 0x18
>
> +#define CS5536_PM_PWRBTN (1 << 8)
> +
> +extern void do_olpc_suspend_lowlevel(void);
> +
> static unsigned long acpi_base;
> static unsigned long pms_base;
>
> +static struct {
> + unsigned long address;
> + unsigned short segment;
> +} ofw_bios_entry = { 0xF0000 + PAGE_OFFSET, __KERNEL_CS };
> +
> +static int xo1_power_state_enter(suspend_state_t pm_state)
> +{
> + int r;
> +
> + /* Only STR is supported */
> + if (pm_state != PM_SUSPEND_MEM)
> + return -EINVAL;
> +
> + r = olpc_ec_cmd(EC_SET_SCI_INHIBIT, NULL, 0, NULL, 0);
> + if (r)
> + return r;
> +
> + /* Save CPU state */
> + do_olpc_suspend_lowlevel();
> +
> + /* Resume path starts here */
> +
> + /* Tell the EC to stop inhibiting SCIs */
> + olpc_ec_cmd(EC_SET_SCI_INHIBIT_RELEASE, NULL, 0, NULL, 0);
> +
> + /*
> + * Tell the wireless module to restart USB communication.
> + * Must be done twice.
> + */
> + olpc_ec_cmd(EC_WAKE_UP_WLAN, NULL, 0, NULL, 0);
> + olpc_ec_cmd(EC_WAKE_UP_WLAN, NULL, 0, NULL, 0);
> +
> + return 0;
> +}
> +
> +asmlinkage int olpc_xo1_do_sleep(u8 sleep_state)
> +{
> + void *pgd_addr = __va(read_cr3());
> + printk(KERN_ERR "xo1_do_sleep!\n"); /* this needs to remain here so
> + * that gcc doesn't optimize
> + * away our __va! */
> +
> + /* Enable wakeup through power button */
> + outl((CS5536_PM_PWRBTN << 16) | 0xFFFF, acpi_base + PM1_STS);
> +
> + __asm__ __volatile__("movl %0,%%eax" : : "r" (pgd_addr));
> + __asm__("call *(%%edi); cld"
> + : : "D" (&ofw_bios_entry));
> + __asm__ __volatile__("movb $0x34, %al\n\t"
> + "outb %al, $0x70\n\t"
> + "movb $0x30, %al\n\t"
> + "outb %al, $0x71\n\t");
> + return 0;
> +}
> +
> +static int xo1_power_state_valid(suspend_state_t pm_state)
> +{
> + /* suspend-to-RAM only */
> + return pm_state == PM_SUSPEND_MEM;
> +}
> +
> +static struct platform_suspend_ops xo1_suspend_ops = {
> + .valid = xo1_power_state_valid,
> + .enter = xo1_power_state_enter,
> +};
> +
> static void xo1_power_off(void)
> {
> printk(KERN_INFO "OLPC XO-1 power off sequence...\n");
> @@ -101,6 +173,13 @@ static int __devinit olpc_xo1_probe(struct platform_device *pdev)
> if (r)
> return r;
>
> + /*
> + * Take a reference on ourself to prevent module unloading. We can't
> + * safely unload after changing the suspend handlers.
> + */
> + __module_get(THIS_MODULE);
> +
> + suspend_set_ops(&xo1_suspend_ops);
> pm_power_off = xo1_power_off;
>
> printk(KERN_INFO "OLPC XO-1 support registered\n");
> diff --git a/arch/x86/mm/init_32.c b/arch/x86/mm/init_32.c
> index 43bbc29..dbdab67 100644
> --- a/arch/x86/mm/init_32.c
> +++ b/arch/x86/mm/init_32.c
> @@ -549,7 +549,7 @@ static void __init pagetable_init(void)
> permanent_kmaps_init(pgd_base);
> }
>
> -#ifdef CONFIG_ACPI_SLEEP
> +#if defined(CONFIG_ACPI_SLEEP) || defined(CONFIG_OLPC_XO1)
> /*
> * ACPI suspend needs this for resume, because things like the intel-agp
> * driver might have split up a kernel 4MB mapping.
> @@ -561,11 +561,11 @@ static inline void save_pg_dir(void)
> {
> copy_page(swsusp_pg_dir, swapper_pg_dir);
> }
> -#else /* !CONFIG_ACPI_SLEEP */
> +#else /* !CONFIG_ACPI_SLEEP && !CONFIG_OLPC_XO1 */
> static inline void save_pg_dir(void)
> {
> }
> -#endif /* !CONFIG_ACPI_SLEEP */
> +#endif /* !CONFIG_ACPI_SLEEP && !CONFIG_OLPC_XO1 */
>
> void zap_low_mappings(bool early)
> {
> --
---
~Randy
*** Remember to use Documentation/SubmitChecklist when testing your code ***
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