intel/i945: Use romstage_handoff for S3

Don't use scratchpad registers when we have romstage_handoff
to pass S3 resume flag. Scratchpad register was read too
late in ramstage so acpi_is_wakeup_s3() did not evaluate
correctly.

This fixes low memory corruption at 0x1000-0x102c and the lack
of coreboot tables (util/cbmem not working) after S3 resume.

This also fixes console log from reporting early in ramstage
"Normal boot" while on "S3 resume" path.

Change-Id: I2922a15a90d2f8272c3482579bdd96f8f33e9705
Signed-off-by: Kyösti Mälkki <kyosti.malkki@gmail.com>
Reviewed-on: https://review.coreboot.org/17675
Tested-by: build bot (Jenkins)
Reviewed-by: Aaron Durbin <adurbin@chromium.org>

src/mainboard/lenovo/t60/mainboard.c

@@ -17,12 +17,12 @@
 
 #include <console/console.h>
 #include <device/device.h>
+#include <arch/acpi.h>
 #include <arch/io.h>
 #include <delay.h>
 #include <string.h>
 #include <device/pci_def.h>
 #include <device/pci_ops.h>
-#include <arch/io.h>
 #include <ec/lenovo/pmh7/pmh7.h>
 #include <ec/acpi/ec.h>
 #include <ec/lenovo/h8/h8.h>
@@ -49,13 +49,12 @@ int get_cst_entries(acpi_cstate_t **entries)
 static void mainboard_init(device_t dev)
 {
 	struct southbridge_intel_i82801gx_config *config;
-	device_t dev0, idedev;
+	device_t idedev;
 
 	install_intel_vga_int15_handler(GMA_INT15_ACTIVE_LFP_INT_LVDS, GMA_INT15_PANEL_FIT_DEFAULT, PANEL, 3);
 
 	/* If we're resuming from suspend, blink suspend LED */
-	dev0 = dev_find_slot(0, PCI_DEVFN(0,0));
-	if (dev0 && pci_read_config32(dev0, SKPAD) == SKPAD_ACPI_S3_MAGIC)
+	if (acpi_is_wakeup_s3())
 		ec_write(0x0c, 0xc7);
 
 	idedev = dev_find_slot(0, PCI_DEVFN(0x1f,1));

src/mainboard/lenovo/x60/mainboard.c

@@ -17,13 +17,13 @@
 
 #include <console/console.h>
 #include <device/device.h>
+#include <arch/acpi.h>
 #include <arch/io.h>
 #include <delay.h>
 #include <string.h>
 #include <device/pci_def.h>
 #include <device/pci_ops.h>
 #include <device/pci_ids.h>
-#include <arch/io.h>
 #include <arch/interrupt.h>
 #include <ec/lenovo/pmh7/pmh7.h>
 #include <ec/acpi/ec.h>
@@ -79,7 +79,7 @@ int get_cst_entries(acpi_cstate_t **entries)
 
 static void mainboard_init(device_t dev)
 {
-	device_t dev0, idedev, sdhci_dev;
+	device_t idedev, sdhci_dev;
 
 	ec_clr_bit(0x03, 2);
 
@@ -91,8 +91,7 @@ static void mainboard_init(device_t dev)
 	install_intel_vga_int15_handler(GMA_INT15_ACTIVE_LFP_INT_LVDS, GMA_INT15_PANEL_FIT_DEFAULT, PANEL, 3);
 
 	/* If we're resuming from suspend, blink suspend LED */
-	dev0 = dev_find_slot(0, PCI_DEVFN(0,0));
-	if (dev0 && pci_read_config32(dev0, SKPAD) == SKPAD_ACPI_S3_MAGIC)
+	if (acpi_is_wakeup_s3())
 		ec_write(0x0c, 0xc7);
 
 	idedev = dev_find_slot(0, PCI_DEVFN(0x1f,1));

src/northbridge/intel/i945/early_init.c

@@ -21,6 +21,7 @@
 #include <device/pci_def.h>
 #include <cbmem.h>
 #include <halt.h>
+#include <romstage_handoff.h>
 #include <string.h>
 #include "i945.h"
 #include <pc80/mc146818rtc.h>
@@ -197,7 +198,6 @@ static void i945_setup_bars(void)
 	pci_write_config8(PCI_DEV(0, 0x00, 0), PAM5, 0x33);
 	pci_write_config8(PCI_DEV(0, 0x00, 0), PAM6, 0x33);
 
-	pci_write_config32(PCI_DEV(0, 0x00, 0), SKPAD, SKPAD_NORMAL_BOOT_MAGIC);
 	printk(BIOS_DEBUG, " done.\n");
 
 	/* Wait for MCH BAR to come up */
@@ -901,15 +901,7 @@ static void i945_prepare_resume(int s3resume)
 
 	cbmem_was_initted = !cbmem_recovery(s3resume);
 
-	/* If there is no high memory area, we didn't boot before, so
-	 * this is not a resume. In that case we just create the cbmem toc.
-	 */
-	if (s3resume && cbmem_was_initted) {
-
-		/* Magic for S3 resume */
-		pci_write_config32(PCI_DEV(0, 0x00, 0), SKPAD,
-				   SKPAD_ACPI_S3_MAGIC);
-	}
+	romstage_handoff_init(cbmem_was_initted && s3resume);
 }
 
 void i945_late_initialization(int s3resume)

src/northbridge/intel/i945/northbridge.c

@@ -175,26 +175,6 @@ static void intel_set_subsystem(device_t dev, unsigned vendor, unsigned device)
 	}
 }
 
-#if CONFIG_HAVE_ACPI_RESUME
-static void northbridge_init(struct device *dev)
-{
-	switch (pci_read_config32(dev, SKPAD)) {
-	case SKPAD_NORMAL_BOOT_MAGIC:
-		printk(BIOS_DEBUG, "Normal boot.\n");
-		acpi_slp_type = 0;
-		break;
-	case SKPAD_ACPI_S3_MAGIC:
-		printk(BIOS_DEBUG, "S3 Resume.\n");
-		acpi_slp_type = 3;
-		break;
-	default:
-		printk(BIOS_DEBUG, "Unknown boot method, assuming normal.\n");
-		acpi_slp_type = 0;
-		break;
-	}
-}
-#endif
-
 static struct pci_operations intel_pci_ops = {
 	.set_subsystem    = intel_set_subsystem,
 };
@@ -204,9 +184,6 @@ static struct device_operations mc_ops = {
 	.set_resources    = pci_dev_set_resources,
 	.enable_resources = pci_dev_enable_resources,
 	.acpi_fill_ssdt_generator = generate_cpu_entries,
-#if CONFIG_HAVE_ACPI_RESUME
-	.init             = northbridge_init,
-#endif
 	.scan_bus         = 0,
 	.ops_pci          = &intel_pci_ops,
 };

src/southbridge/intel/i82801gx/i82801gx.h

@@ -375,7 +375,5 @@ int southbridge_detect_s3_resume(void);
 #define SS_CNT		0x50
 #define C3_RES		0x54
 
-#define SKPAD_ACPI_S3_MAGIC	0xcafed00d
-#define SKPAD_NORMAL_BOOT_MAGIC	0xcafebabe
 #endif /* __ACPI__ */
 #endif				/* SOUTHBRIDGE_INTEL_I82801GX_I82801GX_H */

src/southbridge/intel/i82801gx/smi.c

@@ -19,6 +19,7 @@
 #include <device/pci.h>
 #include <console/console.h>
 #include <arch/io.h>
+#include <arch/acpi.h>
 #include <cpu/cpu.h>
 #include <cpu/x86/cache.h>
 #include <cpu/x86/smm.h>
@@ -313,16 +314,6 @@ static void smm_relocate(void)
 
 static int smm_handler_copied = 0;
 
-static int is_wakeup(void)
-{
-	device_t dev0 = dev_find_slot(0, PCI_DEVFN(0,0));
-
-	if (!dev0)
-		return 0;
-
-	return pci_read_config32(dev0, 0xdc) == SKPAD_ACPI_S3_MAGIC;
-}
-
 static void smm_install(void)
 {
 	/* The first CPU running this gets to copy the SMM handler. But not all
@@ -336,7 +327,7 @@ static void smm_install(void)
 	/* if we're resuming from S3, the SMM code is already in place,
 	 * so don't copy it again to keep the current SMM state */
 
-	if (!is_wakeup()) {
+	if (!acpi_is_wakeup_s3()) {
 		/* enable the SMM memory window */
 		pci_write_config8(dev_find_slot(0, PCI_DEVFN(0, 0)), SMRAM,
 					D_OPEN | G_SMRAME | C_BASE_SEG);