stoneyridge: Add SCI/GPE configuration

Add functions for configuring the GPE ACPI SCI events.

BUG=b:63268311
BRANCH=none
TEST=With the Kahlee GPE setup patch, test lidswitch powers
the device on and off at the login screen.

Change-Id: I5c282268edbd7b92a3f2ca7c72896406c8f8512f
Signed-off-by: Marc Jones <marcj303@gmail.com>
Reviewed-on: https://review.coreboot.org/22095
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Aaron Durbin <adurbin@chromium.org>

src/soc/amd/stoneyridge/include/soc/smi.h

@@ -20,7 +20,18 @@
 
 #include <arch/io.h>
 
+#define SMI_GEVENTS			24
+#define SCIMAPS				58
+#define SCI_GPES			32
+
+#define SMI_EVENT_STATUS		0x0
+#define SMI_EVENT_ENABLE		0x04
+#define SMI_SCI_TRIG			0x08
+#define SMI_SCI_LEVEL			0x0c
 #define SMI_SCI_STATUS			0x10
+#define SMI_SCI_EN			0x14
+#define SMI_SCI_MAP0			0x40
+# define SMI_SCI_MAP(X)			(SMI_SCI_MAP0 + (X))
 
 /* SMI source and status */
 #define SMITYPE_AGPIO65				0
@@ -189,9 +200,21 @@ enum smi_mode {
 	SMI_MODE_IRQ13 = 3,
 };
 
-enum smi_lvl {
+enum smi_sci_type {
-	SMI_LVL_LOW = 0,
+	NONE,
-	SMI_LVL_HIGH = 1,
+	SCI,
+	SMI,
+	BOTH,
+};
+
+enum smi_sci_lvl {
+	SMI_SCI_LVL_LOW,
+	SMI_SCI_LVL_HIGH,
+};
+
+enum smi_sci_dir {
+	SMI_SCI_EDG,
+	SMI_SCI_LVL,
 };
 
 struct smi_sources_t {
@@ -199,10 +222,19 @@ struct smi_sources_t {
 	void (*handler)(void);
 };
 
+struct sci_source {
+	uint8_t scimap;		/* SCIMAP 0-57 */
+	uint8_t gpe;		/* 32 GPEs */
+	uint8_t direction;	/* Active High or Low,  smi_sci_lvl */
+	uint8_t level;		/* Edge or Level,  smi_sci_dir */
+};
+
 uint16_t pm_acpi_smi_cmd_port(void);
 void configure_smi(uint8_t smi_num, uint8_t mode);
 void configure_gevent_smi(uint8_t gevent, uint8_t mode, uint8_t level);
+void configure_scimap(const struct sci_source *sci);
 void disable_gevent_smi(uint8_t gevent);
+void gpe_configure_sci(const struct sci_source *scis, size_t num_gpes);
 
 #ifndef __SMM__
 void enable_smi_generation(void);

src/soc/amd/stoneyridge/include/soc/southbridge.h

@@ -276,8 +276,10 @@ u32 pm_read32(u8 reg);
 void pm_write8(u8 reg, u8 value);
 void pm_write16(u8 reg, u16 value);
 void pm_write32(u8 reg, u32 value);
+u8 smi_read8(u8 reg);
 u16 smi_read16(u8 reg);
 u32 smi_read32(u8 reg);
+void smi_write8(u8 reg, u8 value);
 void smi_write16(u8 reg, u16 value);
 void smi_write32(u8 reg, u32 value);
 uint16_t pm_acpi_pm_cnt_blk(void);

src/soc/amd/stoneyridge/sb_util.c

@@ -65,6 +65,16 @@ void smi_write16(uint8_t offset, uint16_t value)
 	write16((void *)(APU_SMI_BASE + offset), value);
 }
 
+uint8_t smi_read8(uint8_t offset)
+{
+	return read8((void *)(APU_SMI_BASE + offset));
+}
+
+void smi_write8(uint8_t offset, uint8_t value)
+{
+	write8((void *)(APU_SMI_BASE + offset), value);
+}
+
 uint16_t pm_acpi_pm_cnt_blk(void)
 {
 	return pm_read16(PM1_CNT_BLK);

src/soc/amd/stoneyridge/smi_util.c

@@ -35,13 +35,13 @@ void configure_smi(uint8_t smi_num, uint8_t mode)
  * @param gevent The GEVENT pin number. Valid values are 0 thru 23
  * @param mode The type of event this pin should generate. Note that only
  *	       SMI_MODE_SMI generates an SMI. SMI_MODE_DISABLE disables events.
- * @param level SMI_LVL_LOW or SMI_LVL_HIGH
+ * @param level SMI__SCI_LVL_LOW or SMI_SCI_LVL_HIGH
  */
 void configure_gevent_smi(uint8_t gevent, uint8_t mode, uint8_t level)
 {
 	uint32_t reg32;
 	/* GEVENT pins range from [0:23] */
-	if (gevent > 23) {
+	if (gevent >= SMI_GEVENTS) {
 		printk(BIOS_WARNING, "BUG: Invalid GEVENT: %u\n", gevent);
 		return;
 	}
@@ -56,6 +56,55 @@ void configure_gevent_smi(uint8_t gevent, uint8_t mode, uint8_t level)
 	smi_write32(SMI_REG_SMITRIG0, reg32);
 }
 
+/**
+ * Configure generation of SCIs.
+ */
+void configure_scimap(const struct sci_source *sci)
+{
+	uint32_t reg32;
+
+	/* GEVENT pins range */
+	if (sci->scimap >= SCIMAPS) {
+		printk(BIOS_WARNING, "BUG: Invalid SCIMAP: %u\n",
+			sci->scimap);
+		return;
+	}
+
+	/* GPEs range from [0:31] */
+	if (sci->gpe >= SCI_GPES) {
+		printk(BIOS_WARNING, "BUG: Invalid SCI GPE: %u\n", sci->gpe);
+		return;
+	}
+
+	printk(BIOS_DEBUG, "SCIMAP %u maps to GPE %u (active %s, %s trigger)\n",
+		sci->scimap, sci->gpe,
+		(!!sci->direction) ? "high" : "low",
+		(!!sci->level) ? "level" : "edge");
+
+	/* Map Gevent to SCI GPE# */
+	smi_write8(SMI_SCI_MAP(sci->scimap), sci->gpe);
+
+	/* Set the trigger direction (high/low) */
+	reg32 = smi_read32(SMI_SCI_TRIG);
+	reg32 &= ~(1 << sci->gpe);
+	reg32 |= !!sci->direction << sci->gpe;
+	smi_write32(SMI_SCI_TRIG, reg32);
+
+	/* Set the trigger level (edge/level) */
+	reg32 = smi_read32(SMI_SCI_LEVEL);
+	reg32 &= ~(1 << sci->gpe);
+	reg32 |= !!sci->level << sci->gpe;
+	smi_write32(SMI_SCI_LEVEL, reg32);
+}
+
+void gpe_configure_sci(const struct sci_source *scis, size_t num_gpes)
+{
+	size_t i;
+
+	for (i = 0; i < num_gpes; i++)
+		configure_scimap(scis + i);
+}
+
 /** Disable events from given GEVENT pin */
 void disable_gevent_smi(uint8_t gevent)
 {