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x86, olpc: Add XO-1 suspend/resume support

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Add code needed for basic suspend/resume of the XO-1 laptop.
Based on earlier work by Jordan Crouse, Andres Salomon, and others.

This patch incorporates all earlier feedback from Thomas Gleixner. To
clarify a certain point (now more obvious in the code itself):
On resume, OpenFirmware returns execution to Linux in protected mode
with a kernel-compatible GDT already set up. The changes and
simplifications suggested have all been included.

Signed-off-by: Daniel Drake <dsd@laptop.org>
Link: http://lkml.kernel.org/r/1309019658-1712-5-git-send-email-dsd@laptop.org
Acked-by: Andres Salomon <dilinger@queued.net>
Signed-off-by: H. Peter Anvin <hpa@linux.intel.com>
This commit is contained in:
Daniel Drake
2011-06-25 17:34:11 +01:00
committed by H. Peter Anvin
parent a3128588b3
commit 97c4cb71c1
6 changed files with 234 additions and 6 deletions
Download Patch File Download Diff File Expand all files Collapse all files

92
arch/x86/platform/olpc/olpc-xo1-pm.c
View File

@@ -16,6 +16,7 @@
#include <linux/platform_device.h>
#include <linux/pm.h>
#include <linux/mfd/core.h>
#include <linux/suspend.h>
#include <asm/io.h>
#include <asm/olpc.h>
@@ -25,6 +26,85 @@
static unsigned long acpi_base;
static unsigned long pms_base;
static u16 wakeup_mask = CS5536_PM_PWRBTN;
static struct {
unsigned long address;
unsigned short segment;
} ofw_bios_entry = { 0xF0000 + PAGE_OFFSET, __KERNEL_CS };
/* Set bits in the wakeup mask */
void olpc_xo1_pm_wakeup_set(u16 value)
{
wakeup_mask |= value;
}
EXPORT_SYMBOL_GPL(olpc_xo1_pm_wakeup_set);
/* Clear bits in the wakeup mask */
void olpc_xo1_pm_wakeup_clear(u16 value)
{
wakeup_mask &= ~value;
}
EXPORT_SYMBOL_GPL(olpc_xo1_pm_wakeup_clear);
static int xo1_power_state_enter(suspend_state_t pm_state)
{
unsigned long saved_sci_mask;
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 SCI mask (this gets lost since PM1_EN is used as a mask for
* wakeup events, which is not necessarily the same event set)
*/
saved_sci_mask = inl(acpi_base + CS5536_PM1_STS);
saved_sci_mask &= 0xffff0000;
/* Save CPU state */
do_olpc_suspend_lowlevel();
/* Resume path starts here */
/* Restore SCI mask (using dword access to CS5536_PM1_EN) */
outl(saved_sci_mask, acpi_base + CS5536_PM1_STS);
/* 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 xo1_do_sleep(u8 sleep_state)
{
void *pgd_addr = __va(read_cr3());
/* Program wakeup mask (using dword access to CS5536_PM1_EN) */
outl(wakeup_mask << 16, acpi_base + CS5536_PM1_STS);
__asm__("movl %0,%%eax" : : "r" (pgd_addr));
__asm__("call *(%%edi); cld"
: : "D" (&ofw_bios_entry));
__asm__("movb $0x34, %al\n\t"
"outb %al, $0x70\n\t"
"movb $0x30, %al\n\t"
"outb %al, $0x71\n\t");
return 0;
}
static void xo1_power_off(void)
{
printk(KERN_INFO "OLPC XO-1 power off sequence...\n");
@@ -43,6 +123,17 @@ static void xo1_power_off(void)
outl(0x00002000, acpi_base + CS5536_PM1_CNT);
}
static int xo1_power_state_valid(suspend_state_t pm_state)
{
/* suspend-to-RAM only */
return pm_state == PM_SUSPEND_MEM;
}
static const struct platform_suspend_ops xo1_suspend_ops = {
.valid = xo1_power_state_valid,
.enter = xo1_power_state_enter,
};
static int __devinit xo1_pm_probe(struct platform_device *pdev)
{
struct resource *res;
@@ -68,6 +159,7 @@ static int __devinit xo1_pm_probe(struct platform_device *pdev)
/* If we have both addresses, we can override the poweroff hook */
if (pms_base && acpi_base) {
suspend_set_ops(&xo1_suspend_ops);
pm_power_off = xo1_power_off;
printk(KERN_INFO "OLPC XO-1 support registered\n");
}