Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1755564Ab0KKPCR (ORCPT ); Thu, 11 Nov 2010 10:02:17 -0500 Received: from mtaout02-winn.ispmail.ntl.com ([81.103.221.48]:7223 "EHLO mtaout02-winn.ispmail.ntl.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753869Ab0KKPCP (ORCPT ); Thu, 11 Nov 2010 10:02:15 -0500 From: Daniel Drake To: tglx@linutronix.de To: mingo@redhat.com To: hpa@zytor.com To: x86@kernel.org Cc: linux-kernel@vger.kernel.org Subject: [PATCH] OLPC: Add XO-1 suspend/resume support Message-Id: <20101111150210.B84E49D401B@zog.reactivated.net> Date: Thu, 11 Nov 2010 15:02:10 +0000 (GMT) X-Cloudmark-Analysis: v=1.1 cv=X0sWjjQ37bMP4yB/pNNinY3VxVB2n/hmdAjhihaCFGs= c=1 sm=0 a=419UjrMU8xoA:10 a=Op-mwl0xAAAA:8 a=Uylrg1PJ_mGYvFKekVwA:9 a=eIS83zP1Xf5fIaSwLTAA:7 a=N2-3kUS7CyFSEaWo2oDR-owS5qcA:4 a=d4CUUju0HPYA:10 a=HpAAvcLHHh0Zw7uRqdWCyQ==:117 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 7447 Lines: 317 Add code needed for basic suspend/resume of the XO-1 laptop. Signed-off-by: Daniel Drake --- arch/x86/Kconfig | 2 +- arch/x86/include/asm/olpc.h | 9 ++- arch/x86/platform/olpc/Makefile | 2 +- arch/x86/platform/olpc/olpc-xo1-wakeup.S | 132 ++++++++++++++++++++++++++++++ arch/x86/platform/olpc/olpc-xo1.c | 79 ++++++++++++++++++ 5 files changed, 219 insertions(+), 5 deletions(-) create mode 100644 arch/x86/platform/olpc/olpc-xo1-wakeup.S v2: add dependency on CONFIG_PM_SLEEP (thanks Randy), avoid requirement on hacking swsusp_pg_dir by switching to initial_page_table v3: rebase to fix conflict in olpc.h with the now-merged XO-1 rfkill driver Resending after 2 weeks of no feedback. diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig index e832768..a27b0dc 100644 --- a/arch/x86/Kconfig +++ b/arch/x86/Kconfig @@ -2041,7 +2041,7 @@ config OLPC config OLPC_XO1 tristate "OLPC XO-1 support" - depends on OLPC && PCI + depends on OLPC && PCI && PM_SLEEP ---help--- Add support for non-essential features of the OLPC XO-1 laptop. diff --git a/arch/x86/include/asm/olpc.h b/arch/x86/include/asm/olpc.h index 42a978c..5bf0805 100644 --- a/arch/x86/include/asm/olpc.h +++ b/arch/x86/include/asm/olpc.h @@ -88,9 +88,12 @@ extern int olpc_ec_mask_unset(uint8_t bits); /* EC commands */ -#define EC_FIRMWARE_REV 0x08 -#define EC_WLAN_ENTER_RESET 0x35 -#define EC_WLAN_LEAVE_RESET 0x25 +#define EC_FIRMWARE_REV 0x08 +#define EC_WAKE_UP_WLAN 0x24 +#define EC_WLAN_LEAVE_RESET 0x25 +#define EC_SET_SCI_INHIBIT 0x32 +#define EC_SET_SCI_INHIBIT_RELEASE 0x34 +#define EC_WLAN_ENTER_RESET 0x35 /* SCI source values */ diff --git a/arch/x86/platform/olpc/Makefile b/arch/x86/platform/olpc/Makefile index c31b8fc..a1e7f02 100644 --- a/arch/x86/platform/olpc/Makefile +++ b/arch/x86/platform/olpc/Makefile @@ -1,3 +1,3 @@ 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 diff --git a/arch/x86/platform/olpc/olpc-xo1-wakeup.S b/arch/x86/platform/olpc/olpc-xo1-wakeup.S new file mode 100644 index 0000000..d36e5f4 --- /dev/null +++ b/arch/x86/platform/olpc/olpc-xo1-wakeup.S @@ -0,0 +1,132 @@ +.text +#include +#include +#include +#include + + .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 $initial_page_table - __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/platform/olpc/olpc-xo1.c b/arch/x86/platform/olpc/olpc-xo1.c index f5442c0..9a06081 100644 --- a/arch/x86/platform/olpc/olpc-xo1.c +++ b/arch/x86/platform/olpc/olpc-xo1.c @@ -16,6 +16,7 @@ #include #include #include +#include #include #include @@ -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"); -- 1.7.3.2 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/