baytrail: add support for S3 resume
Previously the only path through memory init and coreboot was
hardcoding S5. Therefore all S3 paths would not be taken. Allow
for S3 resume to work by enabling the proper control paths in
romstage.
BUG=chrome-os-partner:22867
BRANCH=None
TEST=While in kernel 'echo mem > /sys/power/state'. Board went
into S3. Power button press resumed back into kernel.
Change-Id: I3cbae73223f0d71c74eb3d6b7c25d1b32318ab3e
Signed-off-by: Aaron Durbin <adurbin@chromium.org>
Reviewed-on: https://chromium-review.googlesource.com/175940
Reviewed-by: Duncan Laurie <dlaurie@chromium.org>
Reviewed-on: http://review.coreboot.org/4943
Tested-by: build bot (Jenkins)
Reviewed-by: Kyösti Mälkki <kyosti.malkki@gmail.com>
diff --git a/src/soc/intel/baytrail/baytrail/pmc.h b/src/soc/intel/baytrail/baytrail/pmc.h
index 92edb6e..1a7588c 100644
--- a/src/soc/intel/baytrail/baytrail/pmc.h
+++ b/src/soc/intel/baytrail/baytrail/pmc.h
@@ -24,9 +24,11 @@
#define IOCOM1 0x3f8
/* Memory mapped IO registers behind PMC_BASE_ADDRESS */
-#define GEN_PMCONF1 0x20
+#define GEN_PMCON1 0x20
# define AFTERG3_EN (1 << 0)
# define UART_EN (1 << 24)
+# define PWR_FLR (1 << 16)
+# define SUS_PWR_FLR (1 << 14)
#define ETR 0x48
# define CF9LOCK (1 << 31)
# define LTR_DEF (1 << 22)
@@ -86,7 +88,8 @@
#define TMROF_EN (1 << 0)
#define PM1_CNT 0x04
#define SLP_EN (1 << 13)
-#define SLP_TYP (7 << 10)
+#define SLP_TYP_SHIFT 10
+#define SLP_TYP (7 << SLP_TYP_SHIFT)
#define SLP_TYP_S0 0
#define SLP_TYP_S1 1
#define SLP_TYP_S3 5
diff --git a/src/soc/intel/baytrail/romstage/raminit.c b/src/soc/intel/baytrail/romstage/raminit.c
index 98d389e..017f37d 100644
--- a/src/soc/intel/baytrail/romstage/raminit.c
+++ b/src/soc/intel/baytrail/romstage/raminit.c
@@ -18,7 +18,9 @@
*/
#include <stddef.h>
+#include <arch/hlt.h>
#include <arch/io.h>
+#include <bootmode.h>
#include <cbfs.h>
#include <cbmem.h>
#include <console/console.h>
@@ -28,8 +30,14 @@
#include <baytrail/iomap.h>
#include <baytrail/iosf.h>
#include <baytrail/pci_devs.h>
+#include <baytrail/reset.h>
#include <baytrail/romstage.h>
+static void reset_system(void)
+{
+ warm_reset();
+ while(1) { hlt(); }
+}
static void enable_smbus(void)
{
@@ -111,9 +119,16 @@
mp->console_out = &send_to_console;
mp->prev_sleep_state = prev_sleep_state;
- if (!mrc_cache_get_current(&cache)) {
+ if (recovery_mode_enabled()) {
+ printk(BIOS_DEBUG, "Recovery mode: not using MRC cache.\n");
+ } else if (!mrc_cache_get_current(&cache)) {
mp->saved_data_size = cache->size;
mp->saved_data = &cache->data[0];
+ } else if (prev_sleep_state == 3) {
+ /* If waking from S3 and no cache then. */
+ printk(BIOS_DEBUG, "No MRC cache found in S3 resume path.\n");
+ post_code(POST_RESUME_FAILURE);
+ reset_system();
} else {
printk(BIOS_DEBUG, "No MRC cache found.\n");
}
@@ -132,7 +147,15 @@
print_dram_info();
- cbmem_initialize_empty();
+ if (prev_sleep_state != 3) {
+ cbmem_initialize_empty();
+ } else if (cbmem_initialize()) {
+ #if CONFIG_HAVE_ACPI_RESUME
+ printk(BIOS_DEBUG, "Failed to recover CBMEM in S3 resume.\n");
+ /* Failed S3 resume, reset to come up cleanly */
+ reset_system();
+ #endif
+ }
printk(BIOS_DEBUG, "MRC Wrapper returned %d\n", ret);
printk(BIOS_DEBUG, "MRC data at %p %d bytes\n", mp->data_to_save,
diff --git a/src/soc/intel/baytrail/romstage/romstage.c b/src/soc/intel/baytrail/romstage/romstage.c
index 5af9bf4..969e848 100644
--- a/src/soc/intel/baytrail/romstage/romstage.c
+++ b/src/soc/intel/baytrail/romstage/romstage.c
@@ -36,6 +36,7 @@
#include <baytrail/iomap.h>
#include <baytrail/lpc.h>
#include <baytrail/pci_devs.h>
+#include <baytrail/pmc.h>
#include <baytrail/reset.h>
#include <baytrail/romstage.h>
#include <baytrail/smm.h>
@@ -139,10 +140,50 @@
return setup_stack_and_mttrs();
}
+/* Return 0, 3, or 5 to indicate the previous sleep state. */
+static int chipset_prev_sleep_state(void)
+{
+ uint16_t pm1_sts;
+ uint32_t pm1_cnt;
+ uint32_t gen_pmcon1;
+ /* Default to S0. */
+ int prev_sleep_state = 0;
+
+ pm1_sts = inw(ACPI_BASE_ADDRESS + PM1_STS);
+ pm1_cnt = inl(ACPI_BASE_ADDRESS + PM1_CNT);
+
+ if (pm1_sts & WAK_STS) {
+ switch ((pm1_cnt & SLP_TYP) >> SLP_TYP_SHIFT) {
+ #if CONFIG_HAVE_ACPI_RESUME
+ case SLP_TYP_S3:
+ prev_sleep_state = 3;
+ break;
+ #endif
+ case SLP_TYP_S5:
+ prev_sleep_state = 5;
+ }
+ /* Clear SLP_TYP. */
+ outl(pm1_cnt & ~(SLP_TYP), ACPI_BASE_ADDRESS + PM1_CNT);
+ }
+
+ gen_pmcon1 = read32(PMC_BASE_ADDRESS + GEN_PMCON1);
+ if (gen_pmcon1 & (PWR_FLR | SUS_PWR_FLR)) {
+ /* Clear power failure bits. */
+ write32(PMC_BASE_ADDRESS + GEN_PMCON1, gen_pmcon1);
+ prev_sleep_state = 5;
+ }
+
+ printk(BIOS_DEBUG, "pm1_sts = %04x pm1_cnt = %08x gen_pmcon1 = %08x\n",
+ pm1_sts, pm1_cnt, gen_pmcon1);
+
+ return prev_sleep_state;
+}
+
/* Entry from the mainboard. */
void romstage_common(struct romstage_params *params)
{
struct romstage_handoff *handoff;
+ int prev_sleep_state;
mark_ts(params, timestamp_get());
@@ -150,14 +191,18 @@
boot_count_increment();
#endif
+ prev_sleep_state = chipset_prev_sleep_state();
+
+ printk(BIOS_DEBUG, "prev_sleep_state = S%d\n", prev_sleep_state);
+
/* Initialize RAM */
- raminit(params->mrc_params, 5);
+ raminit(params->mrc_params, prev_sleep_state);
mark_ts(params, timestamp_get());
handoff = romstage_handoff_find_or_add();
if (handoff != NULL)
- handoff->s3_resume = 0;
+ handoff->s3_resume = (prev_sleep_state == 3);
else
printk(BIOS_DEBUG, "Romstage handoff structure not added!\n");