Fix SPI BAR special case in lpc_set_resources

There was already a special case for the SPI base address in
lpc_set_resources for southbridge/amd/cimx/sb800 and
southbridge/amd/agesa/hudson, but it needed to be modified
to keep from killing the IMC rom during initialization.  As
soon as the BAR is disabled by setting the new base address,
the IMC dies.  The fix is to make sure it's still enabled
when setting the new base address instead of setting the new
address then re-enabling it.

Change the name SPIROM_BASE_ADDRESS to SPIROM_BASE_ADDRESS_REGISTER
to more accurately describe what we're using.

Change-Id: I216d75b722c4332c239d487111a9880eabf59e91
Signed-off-by: Martin Roth <martin@se-eng.com>
Reviewed-on: http://review.coreboot.org/1975
Reviewed-by: Stefan Reinauer <stefan.reinauer@coreboot.org>
Tested-by: build bot (Jenkins)
Reviewed-by: Marc Jones <marcj303@gmail.com>

src/southbridge/amd/agesa/hudson/hudson.h

@@ -56,6 +56,7 @@ void set_sm_enable_bits(device_t sm_dev, u32 reg_pos, u32 mask, u32 val);
 #define GPE0_BLK_ADDRESS                        0x820                           //  AcpiGpe0BlkAddr;
 #define SMI_CMD_PORT                            0xB0                            //      SmiCmdPortAddr;
 #define ACPI_PMA_CNT_BLK_ADDRESS        0xFE00                          //      AcpiPmaCntBlkAddr;
+#define SPIROM_BASE_ADDRESS_REGISTER    0xA0
 
 #ifdef __PRE_RAM__
 void hudson_lpc_port80(void);

src/southbridge/amd/agesa/hudson/lpc.c

@@ -23,6 +23,7 @@
 #include <device/pnp.h>
 #include <device/pci_ids.h>
 #include <device/pci_ops.h>
+#include <device/pci_def.h>
 #include <pc80/mc146818rtc.h>
 #include <pc80/isa-dma.h>
 #include <arch/io.h>
@@ -104,11 +105,12 @@ static void hudson_lpc_set_resources(struct device *dev)
 {
 	struct resource *res;
 
+	/* Special case. SPI Base Address. The SpiRomEnable should STAY set. */
+	res = find_resource(dev, SPIROM_BASE_ADDRESS_REGISTER);
+	res->base |= PCI_COMMAND_MEMORY;
+
 	pci_dev_set_resources(dev);
 
-	/* Specical case. SPI Base Address. The SpiRomEnable should be set. */
-	res = find_resource(dev, 0xA0);
-	pci_write_config32(dev, 0xA0, res->base | 1 << 1);
 
 }
 

src/southbridge/amd/cimx/sb800/lpc.c

@@ -19,6 +19,7 @@
 
 #include <console/console.h>
 #include <device/pci.h>
+#include <device/pci_def.h>
 #include <arch/ioapic.h>
 #include "lpc.h"
 #include <arch/io.h>
@@ -32,7 +33,7 @@ void lpc_read_resources(device_t dev)
 	/* Get the normal pci resources of this device */
 	pci_dev_read_resources(dev);	/* We got one for APIC, or one more for TRAP */
 
-	pci_get_resource(dev, SPIROM_BASE_ADDRESS); /* SPI ROM base address */
+	pci_get_resource(dev, SPIROM_BASE_ADDRESS_REGISTER); /* SPI ROM base address */
 
 	/* Add an extra subtractive resource for both memory and I/O. */
 	res = new_resource(dev, IOINDEX_SUBTRACTIVE(0, 0));
@@ -61,11 +62,13 @@ void lpc_set_resources(struct device *dev)
 	struct resource *res;
 
 	printk(BIOS_DEBUG, "SB800 - Lpc.c - lpc_set_resources - Start.\n");
+
+	/* Special case. SPI Base Address. The SpiRomEnable should STAY set. */
+	res = find_resource(dev, SPIROM_BASE_ADDRESS_REGISTER);
+	res->base |= PCI_COMMAND_MEMORY;
+
 	pci_dev_set_resources(dev);
 
-	/* Specical case. SPI Base Address. The SpiRomEnable should be set. */
-	res = find_resource(dev, SPIROM_BASE_ADDRESS);
-	pci_write_config32(dev, SPIROM_BASE_ADDRESS, res->base | 1 << 1);
 	printk(BIOS_DEBUG, "SB800 - Lpc.c - lpc_set_resources - End.\n");
 }
 

src/southbridge/amd/cimx/sb800/lpc.h

@@ -20,7 +20,7 @@
 #ifndef _SB800_LPC_H_
 #define _SB800_LPC_H_
 
-#define SPIROM_BASE_ADDRESS	0xA0 /* SPI ROM base address */
+#define SPIROM_BASE_ADDRESS_REGISTER	0xA0 /* SPI ROM base address */
 
 void lpc_read_resources(device_t dev);
 void lpc_set_resources(device_t dev);