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SubjectS4bios support
Hi!

I ported s4bios support to 2.5.21 and make it somehow work on my
machine. It suspend, resumes (with nice graphics ;-), but kernel does
not wake up devices properly. If someone wants to play...
Pavel
--- linux-swsusp/arch/i386/kernel/suspend.c Wed Jun 12 08:39:31 2002
+++ linux-s4bios/arch/i386/kernel/suspend.c Wed Jun 12 20:31:43 2002
@@ -302,3 +302,18 @@
do_magic_resume_2();
}
#endif
+
+void do_suspend_magic_s4bios(int resume)
+{
+ if (!resume) {
+ save_processor_context();
+ acpi_save_register_state((unsigned long) &&acpi_sleep_done);
+ acpi_enter_s4bios();
+ return;
+ }
+acpi_sleep_done:
+ restore_processor_context();
+ printk("CPU context restored...\n");
+}
+
+
--- linux-swsusp/drivers/acpi/hardware/hwsleep.c Mon Jun 3 11:43:29 2002
+++ linux-s4bios/drivers/acpi/hardware/hwsleep.c Wed Jun 12 20:51:44 2002
@@ -24,6 +24,8 @@
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/

+#include <linux/delay.h>
+
#include "acpi.h"

#define _COMPONENT ACPI_HARDWARE
@@ -289,9 +291,10 @@
* away entirely.
*/
acpi_os_stall (10000000);
-
+#if 0
status = acpi_hw_register_write (ACPI_MTX_LOCK, ACPI_REGISTER_PM1_CONTROL,
sleep_enable_reg_info->access_bit_mask);
+#endif
if (ACPI_FAILURE (status)) {
return_ACPI_STATUS (status);
}
@@ -311,6 +314,56 @@

return_ACPI_STATUS (AE_OK);
}
+
+
+/******************************************************************************
+ *
+ * FUNCTION: Acpi_enter_s4bios
+ *
+ * RETURN: Status
+ *
+ * DESCRIPTION: Perform a s4 bios request.
+ *
+ ******************************************************************************/
+
+acpi_status
+acpi_enter_s4bios (void)
+{
+ acpi_status status;
+ u32 in_value;
+
+ ACPI_FUNCTION_TRACE ("Acpi_enter_s4bios");
+ printk("Acpi_enter_s4bios\n");
+
+ acpi_set_register (ACPI_BITREG_WAKE_STATUS, 1, ACPI_MTX_LOCK);
+ printk("2\n");
+ acpi_hw_clear_acpi_status();
+
+ printk("3\n");
+ acpi_hw_disable_non_wakeup_gpes();
+
+ printk("4\n");
+ ACPI_FLUSH_CPU_CACHE();
+
+ printk("go");
+ mdelay(1000);
+ status = acpi_os_write_port (acpi_gbl_FADT->smi_cmd, (acpi_integer) acpi_gbl_FADT->S4bios_req, 8);
+
+ printk("5\n");
+ do {
+ status = acpi_get_register (ACPI_BITREG_WAKE_STATUS, &in_value, ACPI_MTX_LOCK);
+ if (ACPI_FAILURE (status)) {
+ return_ACPI_STATUS (status);
+ }
+
+ printk("6");
+ /* Spin until we wake */
+
+ } while (!in_value);
+
+ return_ACPI_STATUS (AE_OK);
+}
+

/******************************************************************************
*
--- linux-swsusp/drivers/acpi/system.c Mon Jun 10 23:03:25 2002
+++ linux-s4bios/drivers/acpi/system.c Wed Jun 12 21:05:08 2002
@@ -26,6 +26,7 @@
#define ACPI_C
#define HAVE_NEW_DEVICE_MODEL

+#define HAVE_NEW_DEVICE_MODEL
#include <linux/config.h>
#include <linux/kernel.h>
#include <linux/module.h>
@@ -99,6 +100,17 @@
acpi_enter_sleep_state(ACPI_STATE_S5);
}

+static void
+acpi_enter_suspend_to_disk(void)
+{
+ acpi_set_firmware_waking_vector((ACPI_PHYSICAL_ADDRESS) acpi_wakeup_address);
+ acpi_enter_sleep_state_prep(ACPI_STATE_S4);
+ ACPI_DISABLE_IRQS();
+ acpi_enter_sleep_state(ACPI_STATE_S4);
+ acpi_set_firmware_waking_vector((ACPI_PHYSICAL_ADDRESS) 0);
+}
+
+
#endif /*CONFIG_PM*/


@@ -199,8 +211,10 @@
if (state > ACPI_STATE_S1) {
error = acpi_save_state_mem();

+#if 0
if (!error && (state == ACPI_STATE_S4))
error = acpi_save_state_disk();
+#endif

#ifdef HAVE_NEW_DEVICE_MODEL
if (error) {
@@ -278,6 +292,9 @@
case ACPI_STATE_S3:
do_suspend_lowlevel(0);
break;
+ case ACPI_STATE_S4:
+ do_suspend_magic_s4bios(0);
+ break;
}
restore_flags(flags);

@@ -300,7 +317,21 @@
if (state < ACPI_STATE_S1 || state > ACPI_STATE_S5)
return AE_ERROR;

- freeze_processes(); /* device_suspend needs processes to be stopped */
+ switch (state) {
+ case ACPI_STATE_S1:
+ break;
+ case ACPI_STATE_S2:
+ case ACPI_STATE_S3:
+ case ACPI_STATE_S4:
+ /* do we have a wakeup address for S2, S3 and S4? */
+ if (!acpi_wakeup_address)
+ return AE_ERROR;
+ freeze_processes();
+ acpi_set_firmware_waking_vector((ACPI_PHYSICAL_ADDRESS) acpi_wakeup_address);
+ break;
+ default:
+ break;
+ }

/* do we have a wakeup address for S2 and S3? */
if (state == ACPI_STATE_S2 || state == ACPI_STATE_S3) {
@@ -326,15 +357,22 @@
* mode. So, we run these unconditionaly to make sure we have a usable system
* no matter what.
*/
- acpi_system_restore_state(state);
+ printk("restore_state\n");
+// acpi_system_restore_state(state);
+ printk("leave_sleep\n");
acpi_leave_sleep_state(state);
+ printk("enable\n");

/* make sure interrupts are enabled */
ACPI_ENABLE_IRQS();

- /* reset firmware waking vector */
- acpi_set_firmware_waking_vector((ACPI_PHYSICAL_ADDRESS) 0);
- thaw_processes();
+ if (state != ACPI_STATE_S1) {
+ /* reset firmware waking vector */
+ acpi_set_firmware_waking_vector((ACPI_PHYSICAL_ADDRESS) 0);
+
+ thaw_processes();
+ }
+ printk("ready?\n");

return status;
}
@@ -717,7 +755,7 @@


#ifdef CONFIG_SOFTWARE_SUSPEND
- if (state == 4) {
+ if (state == 4 && state_string[1] != 'b') {
software_suspend();
return_VALUE(count);
}
--- linux-swsusp/include/asm-i386/acpi.h Mon Jun 3 11:43:37 2002
+++ linux-s4bios/include/asm-i386/acpi.h Wed Jun 12 11:00:21 2002
@@ -138,6 +138,9 @@
/* early initialization routine */
extern void acpi_reserve_bootmem(void);

+extern void do_suspend_magic(int);
+extern void do_suspend_magic_s4(int);
+
#endif /*CONFIG_ACPI_SLEEP*/

#endif /*__KERNEL__*/
--- linux-swsusp/include/linux/suspend.h Wed Jun 12 08:43:51 2002
+++ linux-s4bios/include/linux/suspend.h Wed Jun 12 11:00:21 2002
@@ -48,6 +48,9 @@
/* mm/vmscan.c */
extern int shrink_mem(void);

+/* kernel/signal.c */
+extern inline void signal_wake_up (struct task_struct *);
+
/* kernel/suspend.c */
extern void software_suspend(void);
extern void software_resume(void);
@@ -55,6 +58,9 @@
extern int register_suspend_notifier(struct notifier_block *);
extern int unregister_suspend_notifier(struct notifier_block *);
extern void refrigerator(unsigned long);
+
+extern int freeze_processes(void);
+extern void thaw_processes(void);

extern int freeze_processes(void);
extern void thaw_processes(void);
--
(about SSSCA) "I don't say this lightly. However, I really think that the U.S.
no longer is classifiable as a democracy, but rather as a plutocracy." --hpa
-
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