southbridge/amd/sb700: Allow use of auxiliary SMBUS controller

Change-Id: I29ece10eeefc2c75a3829c169f1e1aede7194ec2
Signed-off-by: Timothy Pearson <tpearson@raptorengineeringinc.com>
Reviewed-on: http://review.coreboot.org/12079
Reviewed-by: Peter Stuge <peter@stuge.se>
Tested-by: build bot (Jenkins)

src/device/Kconfig

@@ -192,6 +192,10 @@ config MULTIPLE_VGA_ADAPTERS
 	bool
 	default n
 
+config SMBUS_HAS_AUX_CHANNELS
+	bool
+	default n
+
 config SPD_CACHE
 	bool
 	default n

src/include/device/smbus.h

@@ -47,4 +47,9 @@ int smbus_process_call(device_t dev, u8 cmd, u16 data);
 int smbus_block_read(device_t dev, u8 cmd, u8 bytes, u8 *buffer);
 int smbus_block_write(device_t dev, u8 cmd, u8 bytes, const u8 *buffer);
 
+#if IS_ENABLED(CONFIG_SMBUS_HAS_AUX_CHANNELS)
+void smbus_switch_to_channel(uint8_t channel_number);
+uint8_t smbus_get_current_channel(void);
+#endif
+
 #endif /* DEVICE_SMBUS_H */

src/southbridge/amd/sb700/Kconfig

@@ -27,6 +27,7 @@ config SOUTHBRIDGE_SPECIFIC_OPTIONS # dummy
 	select IOAPIC
 	select HAVE_USBDEBUG_OPTIONS
 	select HAVE_HARD_RESET
+	select SMBUS_HAS_AUX_CHANNELS
 
 # Set for southbridge SP5100 which also uses SB700 driver
 config SOUTHBRIDGE_AMD_SUBTYPE_SP5100

src/southbridge/amd/sb700/sm.c

@@ -40,6 +40,11 @@
 #define CONFIG_MAINBOARD_POWER_ON_AFTER_POWER_FAIL MAINBOARD_POWER_ON
 #endif
 
+#define PRIMARY_SMBUS_RESOURCE_NUMBER 0x90
+#define AUXILIARY_SMBUS_RESOURCE_NUMBER 0x58
+
+uint8_t amd_sb700_aux_smbus = 0;
+
 /*
 * SB700 enables all USB controllers by default in SMBUS Control.
 * SB700 enables SATA by default in SMBUS Control.
@@ -312,7 +317,10 @@ static int lsmbus_recv_byte(device_t dev)
 	device = dev->path.i2c.device;
 	pbus = get_pbus_smbus(dev);
 
-	res = find_resource(pbus->dev, 0x90);
+	if (!amd_sb700_aux_smbus)
+		res = find_resource(pbus->dev, PRIMARY_SMBUS_RESOURCE_NUMBER);
+	else
+		res = find_resource(pbus->dev, AUXILIARY_SMBUS_RESOURCE_NUMBER);
 
 	return do_smbus_recv_byte(res->base, device);
 }
@@ -326,7 +334,10 @@ static int lsmbus_send_byte(device_t dev, u8 val)
 	device = dev->path.i2c.device;
 	pbus = get_pbus_smbus(dev);
 
-	res = find_resource(pbus->dev, 0x90);
+	if (!amd_sb700_aux_smbus)
+		res = find_resource(pbus->dev, PRIMARY_SMBUS_RESOURCE_NUMBER);
+	else
+		res = find_resource(pbus->dev, AUXILIARY_SMBUS_RESOURCE_NUMBER);
 
 	return do_smbus_send_byte(res->base, device, val);
 }
@@ -340,7 +351,10 @@ static int lsmbus_read_byte(device_t dev, u8 address)
 	device = dev->path.i2c.device;
 	pbus = get_pbus_smbus(dev);
 
-	res = find_resource(pbus->dev, 0x90);
+	if (!amd_sb700_aux_smbus)
+		res = find_resource(pbus->dev, PRIMARY_SMBUS_RESOURCE_NUMBER);
+	else
+		res = find_resource(pbus->dev, AUXILIARY_SMBUS_RESOURCE_NUMBER);
 
 	return do_smbus_read_byte(res->base, device, address);
 }
@@ -354,7 +368,10 @@ static int lsmbus_write_byte(device_t dev, u8 address, u8 val)
 	device = dev->path.i2c.device;
 	pbus = get_pbus_smbus(dev);
 
-	res = find_resource(pbus->dev, 0x90);
+	if (!amd_sb700_aux_smbus)
+		res = find_resource(pbus->dev, PRIMARY_SMBUS_RESOURCE_NUMBER);
+	else
+		res = find_resource(pbus->dev, AUXILIARY_SMBUS_RESOURCE_NUMBER);
 
 	return do_smbus_write_byte(res->base, device, address, val);
 }
@@ -393,9 +410,18 @@ static void sb700_sm_read_resources(device_t dev)
 
 	/* dev->command |= PCI_COMMAND_MEMORY | PCI_COMMAND_MASTER; */
 
-	/* smbus */
+	/* primary smbus */
-	res = new_resource(dev, 0x90);
+	res = new_resource(dev, PRIMARY_SMBUS_RESOURCE_NUMBER);
-	res->base  = 0xB00;
+	res->base  = SMBUS_IO_BASE;
+	res->size = 0x10;
+	res->limit = 0xFFFFUL;	/* res->base + res->size -1; */
+	res->align = 8;
+	res->gran = 8;
+	res->flags = IORESOURCE_IO | IORESOURCE_FIXED | IORESOURCE_RESERVE | IORESOURCE_ASSIGNED;
+
+	/* auxiliary smbus */
+	res = new_resource(dev, AUXILIARY_SMBUS_RESOURCE_NUMBER);
+	res->base  = SMBUS_AUX_IO_BASE;
 	res->size = 0x10;
 	res->limit = 0xFFFFUL;	/* res->base + res->size -1; */
 	res->align = 8;
@@ -439,8 +465,11 @@ static void sb700_sm_set_resources(struct device *dev)
 	pci_write_config8(dev, 0x65, byte);
 	/* TODO: End of test hpet */
 
-	res = find_resource(dev, 0x90);
+	res = find_resource(dev, PRIMARY_SMBUS_RESOURCE_NUMBER);
-	pci_write_config32(dev, 0x90, res->base | 1);
+	pci_write_config32(dev, PRIMARY_SMBUS_RESOURCE_NUMBER, res->base | 1);
+
+	res = find_resource(dev, AUXILIARY_SMBUS_RESOURCE_NUMBER);
+	pci_write_config32(dev, AUXILIARY_SMBUS_RESOURCE_NUMBER, res->base | 1);
 }
 
 static struct pci_operations lops_pci = {

src/southbridge/amd/sb700/smbus.c

@@ -22,6 +22,11 @@
 
 #include "smbus.h"
 
+extern uint8_t amd_sb700_aux_smbus;
+
+void smbus_switch_to_channel(uint8_t channel_number);
+uint8_t smbus_get_current_channel(void);
+
 void alink_ab_indx(u32 reg_space, u32 reg_addr, u32 mask, u32 val)
 {
 	u32 tmp;
@@ -216,4 +221,14 @@ int do_smbus_write_byte(u32 smbus_io_base, u32 device, u32 address, u8 val)
 	return 0;
 }
 
+void smbus_switch_to_channel(uint8_t channel_number)
+{
+	amd_sb700_aux_smbus = !!channel_number;
+}
+
+uint8_t smbus_get_current_channel(void)
+{
+	return amd_sb700_aux_smbus;
+}
+
 #endif

src/southbridge/amd/sb700/smbus.h

@@ -2,6 +2,7 @@
  * This file is part of the coreboot project.
  *
  * Copyright (C) 2010 Advanced Micro Devices, Inc.
+ * Copyright (C) 2015 Timothy Pearson <tpearson@raptorengineeringinc.com>, Raptor Engineering
  *
  * This program is free software; you can redistribute it and/or modify
  * it under the terms of the GNU General Public License as published by
@@ -24,8 +25,8 @@
 #include "stddef.h"
 #include <arch/io.h>
 
-#define SMBUS_IO_BASE 0x6000	/* Is it a temporary SMBus I/O base address? */
+#define SMBUS_IO_BASE 0xb00
-				/*SIZE 0x40 */
+#define SMBUS_AUX_IO_BASE 0xb20
 
 #define SMBHSTSTAT 0x0
 #define SMBSLVSTAT 0x1