southbridge/hudson: Compile refactored SMI setup utilities in SMM

Refactor hudson_enable_gevent_smi() to allow configuring the interrupt
mode and trigger level. Move the utilities which are useful in SMM to
a separate file that is included in both ramstage and SMM. This is
useful for SMI handlers which need to enable or disable GEVENT SMIs
on-the-fly. A follow-up patch makes use of this infrastructure.

Change-Id: Ifa4c300c00c178b18d7280690cfc4b8367c669b8
Signed-off-by: Alexandru Gagniuc <mr.nuke.me@gmail.com>
Reviewed-on: http://review.coreboot.org/170
Tested-by: build bot (Jenkins)
Reviewed-by: Aaron Durbin <adurbin@gmail.com>

4 files changed, 95 insertions, 52 deletions

diff --git a/src/southbridge/amd/agesa/hudson/Makefile.inc b/src/southbridge/amd/agesa/hudson/Makefile.inc
index b92e850664..398ca90ce3 100644
--- a/src/southbridge/amd/agesa/hudson/Makefile.inc
+++ b/src/southbridge/amd/agesa/hudson/Makefile.inc
@@ -22,8 +22,8 @@ ramstage-$(CONFIG_HAVE_ACPI_RESUME) += resume.c
 romstage-y += imc.c
 ramstage-y += imc.c
 
-smm-$(CONFIG_HAVE_SMI_HANDLER) += smihandler.c
-ramstage-$(CONFIG_HAVE_SMI_HANDLER) += smi.c
+smm-$(CONFIG_HAVE_SMI_HANDLER) += smihandler.c smi_util.c
+ramstage-$(CONFIG_HAVE_SMI_HANDLER) += smi.c smi_util.c
 
 # ROMSIG At ROMBASE + 0x20000:
 # +-----------+---------------+----------------+------------+
diff --git a/src/southbridge/amd/agesa/hudson/smi.c b/src/southbridge/amd/agesa/hudson/smi.c
index 168f2acb4a..1d58afe3f8 100644
--- a/src/southbridge/amd/agesa/hudson/smi.c
+++ b/src/southbridge/amd/agesa/hudson/smi.c
@@ -10,8 +10,6 @@
 #include <console/console.h>
 #include <cpu/cpu.h>
 
-#define HUDSON_SMI_ACPI_COMMAND		75
-
 void smm_setup_structures(void *gnvs, void *tcg, void *smi1)
 {
 	printk(BIOS_DEBUG, "smm_setup_structures STUB!!!\n");
@@ -25,44 +23,3 @@ void hudson_enable_smi_generation(void)
 	reg |= SMITRG0_EOS;	/* Set EOS bit */
 	smi_write32(SMI_REG_SMITRIG0, reg);
 }
-
-static void enable_smi(uint8_t smi_num)
-{
-	uint8_t reg32_offset, bit_offset;
-	uint32_t reg32;
-
-	/* SMI sources range from [0:149] */
-	if (smi_num > 149) {
-		printk(BIOS_WARNING, "BUG: Invalid SMI: %u\n", smi_num);
-		return;
-	}
-
-	/* 16 sources per register, 2 bits per source; registers are 4 bytes */
-	reg32_offset = (smi_num / 16) * 4;
-	bit_offset = (smi_num % 16) * 2;
-
-	reg32 = smi_read32(SMI_REG_CONTROL0 + reg32_offset);
-	reg32 &= ~(3 << (bit_offset));
-	reg32 |= (SMI_SRC_MODE_SMI << (bit_offset));
-	smi_write32(SMI_REG_CONTROL0 + reg32_offset, reg32);
-
-}
-
-/** Enable generation of SMIs for given GPE */
-void hudson_enable_gevent_smi(uint8_t gevent)
-{
-	/* GEVENT pins range from [0:23] */
-	if (gevent > 23) {
-		printk(BIOS_WARNING, "BUG: Invalid GEVENT: %u\n", gevent);
-		return;
-	}
-
-	/* SMI0 source is GEVENT0 and so on */
-	enable_smi(gevent);
-}
-
-/** Enable SMIs on writes to ACPI SMI command port */
-void hudson_enable_acpi_cmd_smi(void)
-{
-	enable_smi(HUDSON_SMI_ACPI_COMMAND);
-}
diff --git a/src/southbridge/amd/agesa/hudson/smi.h b/src/southbridge/amd/agesa/hudson/smi.h
index 7932228280..53da00adfa 100644
--- a/src/southbridge/amd/agesa/hudson/smi.h
+++ b/src/southbridge/amd/agesa/hudson/smi.h
@@ -22,11 +22,16 @@
 
 #define SMI_REG_CONTROL0	0xa0
 
-enum smi_src_mode {
-	SMI_SRC_MODE_DISABLE = 0,
-	SMI_SRC_MODE_SMI = 1,
-	SMI_SRC_MODE_NMI = 2,
-	SMI_SRC_MODE_IRQ13 = 3,
+enum smi_mode {
+	SMI_MODE_DISABLE = 0,
+	SMI_MODE_SMI = 1,
+	SMI_MODE_NMI = 2,
+	SMI_MODE_IRQ13 = 3,
+};
+
+enum smi_lvl {
+	SMI_LVL_LOW = 0,
+	SMI_LVL_HIGH = 1,
 };
 
 static inline uint32_t smi_read32(uint8_t offset)
@@ -49,10 +54,12 @@ static inline void smi_write16(uint8_t offset, uint16_t value)
 	write16(SMI_BASE + offset, value);
 }
 
+void hudson_configure_gevent_smi(uint8_t gevent, uint8_t mode, uint8_t level);
+void hudson_disable_gevent_smi(uint8_t gevent);
+void hudson_enable_acpi_cmd_smi(void);
+
 #ifndef __SMM__
 void hudson_enable_smi_generation(void);
-void hudson_enable_gevent_smi(uint8_t gevent);
-void hudson_enable_acpi_cmd_smi(void);
 #endif
 
 #endif /* _SOUTHBRIDGE_AMD_AGESA_HUDSON_SMI_H */
diff --git a/src/southbridge/amd/agesa/hudson/smi_util.c b/src/southbridge/amd/agesa/hudson/smi_util.c
new file mode 100644
index 0000000000..6076cd43b3
--- /dev/null
+++ b/src/southbridge/amd/agesa/hudson/smi_util.c
@@ -0,0 +1,79 @@
+/*
+ * SMM utilities used in both SMM and normal mode
+ *
+ * Copyright (C) 2014 Alexandru Gagniuc <mr.nuke.me@gmail.com>
+ * Subject to the GNU GPL v2, or (at your option) any later version.
+ */
+
+#include "smi.h"
+
+#include <console/console.h>
+
+#define HUDSON_SMI_ACPI_COMMAND		75
+
+static void configure_smi(uint8_t smi_num, uint8_t mode)
+{
+	uint8_t reg32_offset, bit_offset;
+	uint32_t reg32;
+
+	/* SMI sources range from [0:149] */
+	if (smi_num > 149) {
+		printk(BIOS_WARNING, "BUG: Invalid SMI: %u\n", smi_num);
+		return;
+	}
+
+	/* 16 sources per register, 2 bits per source; registers are 4 bytes */
+	reg32_offset = (smi_num / 16) * 4;
+	bit_offset = (smi_num % 16) * 2;
+
+	reg32 = smi_read32(SMI_REG_CONTROL0 + reg32_offset);
+	reg32 &= ~(0x3 << (bit_offset));
+	reg32 |= (mode & 0x3) << bit_offset;
+	smi_write32(SMI_REG_CONTROL0 + reg32_offset, reg32);
+}
+
+/**
+ * Configure generation of interrupts for given GEVENT pin
+ *
+ * @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
+ */
+void hudson_configure_gevent_smi(uint8_t gevent, uint8_t mode, uint8_t level)
+{
+	uint32_t reg32;
+	/* GEVENT pins range from [0:23] */
+	if (gevent > 23) {
+		printk(BIOS_WARNING, "BUG: Invalid GEVENT: %u\n", gevent);
+		return;
+	}
+
+	/* SMI0 source is GEVENT0 and so on */
+	configure_smi(gevent, mode);
+
+	/* And set set the trigger level */
+	reg32 = smi_read32(SMI_REG_SMITRIG0);
+	reg32 &= ~(1 << gevent);
+	reg32 |= (level & 0x1) << gevent;
+	smi_write32(SMI_REG_SMITRIG0, reg32);
+}
+
+/** Disable events from given GEVENT pin */
+void hudson_disable_gevent_smi(uint8_t gevent)
+{
+	/* GEVENT pins range from [0:23] */
+	if (gevent > 23) {
+		printk(BIOS_WARNING, "BUG: Invalid GEVENT: %u\n", gevent);
+		return;
+	}
+
+	/* SMI0 source is GEVENT0 and so on */
+	configure_smi(gevent, SMI_MODE_DISABLE);
+}
+
+/** Enable SMIs on writes to ACPI SMI command port */
+void hudson_enable_acpi_cmd_smi(void)
+{
+	configure_smi(HUDSON_SMI_ACPI_COMMAND, SMI_MODE_SMI);
+}