ibexpeak / bd82x6x: Make SATA mode user-visible option.

Ability to choose compatibility mode is interesting for testing payloads and
OS for compatibility with older systems.

As per comments
"ide_legacy_combined # TODO: Does nothing since
		      generations, remove from sb code?"
The "combined" mode was removed. It wasn't used by any mobo and the code for
it is almost identical to IDE one other than few bits relating to interrupt
handling and ISA mode.

Change-Id: I407a8fac753b513812a86bef5abcf39c6d81472e
Signed-off-by: Vladimir Serbinenko <phcoder@gmail.com>
Reviewed-on: http://review.coreboot.org/4658
Tested-by: build bot (Jenkins)
Reviewed-by: Patrick Georgi <patrick@georgi-clan.de>

2 files changed, 14 insertions, 40 deletions

diff --git a/src/southbridge/intel/bd82x6x/chip.h b/src/southbridge/intel/bd82x6x/chip.h
index 828466c0c4..0f2f0e9cc2 100644
--- a/src/southbridge/intel/bd82x6x/chip.h
+++ b/src/southbridge/intel/bd82x6x/chip.h
@@ -64,8 +64,6 @@ struct southbridge_intel_bd82x6x_config {
 	uint16_t alt_gp_smi_en;
 
 	/* IDE configuration */
-	uint32_t ide_legacy_combined;
-	uint32_t sata_ahci;
 	uint8_t sata_port_map;
 	uint32_t sata_port0_gen3_tx;
 	uint32_t sata_port1_gen3_tx;
diff --git a/src/southbridge/intel/bd82x6x/sata.c b/src/southbridge/intel/bd82x6x/sata.c
index 594b09d057..133ebee3d1 100644
--- a/src/southbridge/intel/bd82x6x/sata.c
+++ b/src/southbridge/intel/bd82x6x/sata.c
@@ -24,6 +24,7 @@
 #include <device/pci.h>
 #include <device/pci_ids.h>
 #include "pch.h"
+#include <pc80/mc146818rtc.h>
 
 typedef struct southbridge_intel_bd82x6x_config config_t;
 
@@ -45,6 +46,7 @@ static void sata_init(struct device *dev)
 	u16 reg16;
 	/* Get the chip configuration */
 	config_t *config = dev->chip_info;
+	u8 sata_mode;
 
 	printk(BIOS_DEBUG, "SATA: Initializing...\n");
 
@@ -53,48 +55,17 @@ static void sata_init(struct device *dev)
 		return;
 	}
 
+	if (get_option(&sata_mode, "sata_mode") != CB_SUCCESS)
+		/* Default to AHCI */
+		sata_mode = 0;
+
 	/* SATA configuration */
 
 	/* Enable BARs */
 	pci_write_config16(dev, PCI_COMMAND, 0x0007);
 
-	if (config->ide_legacy_combined) {
-		printk(BIOS_DEBUG, "SATA: Controller in combined mode.\n");
-
-		/* No AHCI: clear AHCI base */
-		pci_write_config32(dev, 0x24, 0x00000000);
-		/* And without AHCI BAR no memory decoding */
-		reg16 = pci_read_config16(dev, PCI_COMMAND);
-		reg16 &= ~PCI_COMMAND_MEMORY;
-		pci_write_config16(dev, PCI_COMMAND, reg16);
-
-		pci_write_config8(dev, 0x09, 0x80);
-
-		/* Set timings */
-		pci_write_config16(dev, IDE_TIM_PRI, IDE_DECODE_ENABLE |
-				IDE_ISP_5_CLOCKS | IDE_RCT_4_CLOCKS);
-		pci_write_config16(dev, IDE_TIM_SEC, IDE_DECODE_ENABLE |
-				IDE_ISP_3_CLOCKS | IDE_RCT_1_CLOCKS |
-				IDE_PPE0 | IDE_IE0 | IDE_TIME0);
-
-		/* Sync DMA */
-		pci_write_config16(dev, IDE_SDMA_CNT, IDE_SSDE0);
-		pci_write_config16(dev, IDE_SDMA_TIM, 0x0200);
-
-		/* Set IDE I/O Configuration */
-		reg32 = SIG_MODE_PRI_NORMAL | FAST_PCB1 | FAST_PCB0 | PCB1 | PCB0;
-		pci_write_config32(dev, IDE_CONFIG, reg32);
-
-		/* Port enable */
-		reg16 = pci_read_config16(dev, 0x92);
-		reg16 &= ~0x3f;
-		reg16 |= config->sata_port_map;
-		pci_write_config16(dev, 0x92, reg16);
-
-		/* SATA Initialization register */
-		pci_write_config32(dev, 0x94,
-			   ((config->sata_port_map ^ 0x3f) << 24) | 0x183);
-	} else if(config->sata_ahci) {
+	/* AHCI */
+	if (sata_mode == 0) {
 		u32 abar;
 
 		printk(BIOS_DEBUG, "SATA: Controller in AHCI mode.\n");
@@ -156,6 +127,7 @@ static void sata_init(struct device *dev)
 		reg32 &= ~0x00000005;
 		write32(abar + 0xa0, reg32);
 	} else {
+	        /* IDE */
 		printk(BIOS_DEBUG, "SATA: Controller in plain mode.\n");
 
 		/* No AHCI: clear AHCI base */
@@ -244,15 +216,19 @@ static void sata_enable(device_t dev)
 	/* Get the chip configuration */
 	config_t *config = dev->chip_info;
 	u16 map = 0;
+	u8 sata_mode;
 
 	if (!config)
 		return;
 
+	if (get_option(&sata_mode, "sata_mode") != CB_SUCCESS)
+		sata_mode = 0;
+
 	/*
 	 * Set SATA controller mode early so the resource allocator can
 	 * properly assign IO/Memory resources for the controller.
 	 */
-	if (config->sata_ahci)
+	if (sata_mode == 0)
 		map = 0x0060;
 
 	map |= (config->sata_port_map ^ 0x3f) << 8;