First attempt to clean up SPI probing and create a common construct: the flash bus

At some point the flash bus will be part of struct flashchip.

Pardon me for pushing this in, but I think it is important to beware of further
decay and it will improve things for other developers in the short run.

Carl-Daniel, I will consider your suggestions in another patch. I want to keep
things from getting too much for now. The patch includes Rudolf's VIA SPI
changes though.

Corresponding to flashrom svn r285 and coreboot v2 svn r3401.
Signed-off-by: Stefan Reinauer <stepan@coresystems.de>
Acked-by: Carl-Daniel Hailfinger <c-d.hailfinger.devel.2006@gmx.net>

chipset_enable.c

@@ -35,6 +35,17 @@
 #include <unistd.h>
 #include "flash.h"
 
+/**
+ * flashrom defaults to LPC flash devices. If a known SPI controller is found
+ * and the SPI strappings are set, this will be overwritten by the probing code.
+ *
+ * Eventually, this will become an array when multiple flash support works.
+ */
+
+flashbus_t flashbus = BUS_TYPE_LPC;
+void *spibar = NULL;
+
+
 static int enable_flash_ali_m1533(struct pci_dev *dev, const char *name)
 {
 	uint8_t tmp;
@@ -124,7 +135,7 @@ static int enable_flash_piix4(struct pci_dev *dev, const char *name)
 	 * Note: Accesses to FFFF0000-FFFFFFFF are always forwarded to ISA.
 	 * Set bit 2: BIOSCS# Write Enable (1=enable, 0=disable).
 	 */
-	new = old | 0x2c4;
+	new = old | 0x02c4;
 
 	if (new == old)
 		return 0;
@@ -185,88 +196,131 @@ static int enable_flash_ich_dc(struct pci_dev *dev, const char *name)
 	return enable_flash_ich(dev, name, 0xdc);
 }
 
-void *ich_spibar = NULL;
+#define ICH_STRAP_RSVD 0x00
+#define ICH_STRAP_SPI  0x01
+#define ICH_STRAP_PCI  0x02
+#define ICH_STRAP_LPC  0x03
 
 static int enable_flash_vt8237s_spi(struct pci_dev *dev, const char *name) {
 	uint32_t mmio_base;
 
 	mmio_base = (pci_read_long(dev, 0xbc)) << 8;
 	printf_debug("MMIO base at = 0x%x\n", mmio_base);
-	ich_spibar =  mmap(NULL, 0x70, PROT_READ | PROT_WRITE, MAP_SHARED,
+	spibar =  mmap(NULL, 0x70, PROT_READ | PROT_WRITE, MAP_SHARED,
 				fd_mem, mmio_base);
 
-	if (ich_spibar == MAP_FAILED) {
+	if (spibar == MAP_FAILED) {
 		perror("Can't mmap memory using " MEM_DEV);
 		exit(1);
 	}
 
-	printf_debug("0x6c: 0x%04x     (CLOCK/DEBUG)\n", *(uint16_t *)(ich_spibar + 0x6c));
-	viaspi_detected = 1;
+	printf_debug("0x6c: 0x%04x     (CLOCK/DEBUG)\n", *(uint16_t *)(spibar + 0x6c));
+
+	flashbus = BUS_TYPE_VIA_SPI;
+
 	return 0;
 }
 
-static int enable_flash_ich_dc_spi(struct pci_dev *dev, const char *name, unsigned long spibar)
+static int enable_flash_ich_dc_spi(struct pci_dev *dev, const char *name, int ich_generation)
 {
+	int ret, i;
 	uint8_t old, new, bbs, buc;
+	uint16_t spibar_offset;
 	uint32_t tmp, gcs;
 	void *rcrb;
+	static const char *straps_names[] = { "reserved", "SPI", "PCI", "LPC" };
+	
+	/* Enable Flash Writes */
+	ret = enable_flash_ich_dc(dev, name);
 
-	/* Read the Root Complex Base Address Register (RCBA) */
-	tmp = pci_read_long(dev, 0xf0);
-
-	/* Calculate the Root Complex Register Block address */
-	tmp &= 0xffffc000;
+	/* Get physical address of Root Complex Register Block */
+	tmp = pci_read_long(dev, 0xf0) & 0xffffc000;
 	printf_debug("\nRoot Complex Register Block address = 0x%x\n", tmp);
+
+	/* Map RCBA to virtual memory */
 	rcrb = mmap(0, 0x4000, PROT_READ | PROT_WRITE, MAP_SHARED, fd_mem, (off_t)tmp);
 	if (rcrb == MAP_FAILED) {
 		perror("Can't mmap memory using " MEM_DEV);
 		exit(1);
 	}
-	printf_debug("GCS address = 0x%x\n", tmp + 0x3410);
+
 	gcs = *(volatile uint32_t *)(rcrb + 0x3410);
 	printf_debug("GCS = 0x%x: ", gcs);
 	printf_debug("BIOS Interface Lock-Down: %sabled, ",
 		     (gcs & 0x1) ? "en" : "dis");
 	bbs = (gcs >> 10) & 0x3;
-	printf_debug("BOOT BIOS Straps: 0x%x (%s)\n",	bbs,
-		     (bbs == 0x3) ? "LPC" : ((bbs == 0x2) ? "PCI" : "SPI"));
-	if (bbs >= 2)
-		ich7_detected = 0;
+	printf_debug("BOOT BIOS Straps: 0x%x (%s)\n", bbs, straps_names[bbs]);
 
 	buc = *(volatile uint8_t *)(rcrb + 0x3414);
 	printf_debug("Top Swap : %s\n", (buc & 1)?"enabled (A16 inverted)":"not enabled");
 
+	/* It seems the ICH7 does not support SPI and LPC chips at the same
+	 * time. At least not with our current code. So we prevent searching
+	 * on ICH7 when the southbridge is strapped to LPC
+	 */
+
+	if (ich_generation == 7 && bbs == ICH_STRAP_LPC) {
+		/* No further SPI initialization required */
+		return ret;
+	}
+
+	switch (ich_generation) {
+	case 7:
+		flashbus = BUS_TYPE_ICH7_SPI;
+		spibar_offset = 0x3020;
+		break;
+	case 8:
+		flashbus = BUS_TYPE_ICH9_SPI;
+		spibar_offset = 0x3020;
+		break;
+	case 9:
+	default: /* Future version might behave the same */
+		flashbus = BUS_TYPE_ICH9_SPI;
+		spibar_offset = 0x3800;
+		break;
+	}
+
 	/* SPIBAR is at RCRB+0x3020 for ICH[78] and RCRB+0x3800 for ICH9. */
-	printf_debug("SPIBAR = 0x%x + 0x%04x\n", tmp, (uint16_t)spibar);
+	printf_debug("SPIBAR = 0x%x + 0x%04x\n", tmp, spibar_offset);
 
-	// Assign Virtual Address
-	ich_spibar =  rcrb + spibar;
+	/* Assign Virtual Address */
+	spibar =  rcrb + spibar_offset;
 
-	if (ich7_detected) {
-		int i;
-		printf_debug("0x00: 0x%04x     (SPIS)\n", *(uint16_t *)(ich_spibar + 0));
-		printf_debug("0x02: 0x%04x     (SPIC)\n", *(uint16_t *)(ich_spibar + 2));
-		printf_debug("0x04: 0x%08x (SPIA)\n", *(uint32_t *)(ich_spibar + 4));
+	switch (flashbus) {
+	case BUS_TYPE_ICH7_SPI:
+		printf_debug("0x00: 0x%04x     (SPIS)\n", *(uint16_t *)(spibar + 0));
+		printf_debug("0x02: 0x%04x     (SPIC)\n", *(uint16_t *)(spibar + 2));
+		printf_debug("0x04: 0x%08x (SPIA)\n", *(uint32_t *)(spibar + 4));
 		for (i=0; i < 8; i++) {
 			int offs;
 			offs = 8 + (i * 8);
-			printf_debug("0x%02x: 0x%08x (SPID%d)\n", offs, *(uint32_t *)(ich_spibar + offs), i);
-			printf_debug("0x%02x: 0x%08x (SPID%d+4)\n", offs+4, *(uint32_t *)(ich_spibar + offs +4), i);
+			printf_debug("0x%02x: 0x%08x (SPID%d)\n", offs, *(uint32_t *)(spibar + offs), i);
+			printf_debug("0x%02x: 0x%08x (SPID%d+4)\n", offs+4, *(uint32_t *)(spibar + offs +4), i);
 		}
-		printf_debug("0x50: 0x%08x (BBAR)\n", *(uint32_t *)(ich_spibar + 0x50));
-		printf_debug("0x54: 0x%04x     (PREOP)\n", *(uint16_t *)(ich_spibar + 0x54));
-		printf_debug("0x56: 0x%04x     (OPTYPE)\n", *(uint16_t *)(ich_spibar + 0x56));
-		printf_debug("0x58: 0x%08x (OPMENU)\n", *(uint32_t *)(ich_spibar + 0x58));
-		printf_debug("0x5c: 0x%08x (OPMENU+4)\n", *(uint32_t *)(ich_spibar + 0x5c));
+		printf_debug("0x50: 0x%08x (BBAR)\n", *(uint32_t *)(spibar + 0x50));
+		printf_debug("0x54: 0x%04x     (PREOP)\n", *(uint16_t *)(spibar + 0x54));
+		printf_debug("0x56: 0x%04x     (OPTYPE)\n", *(uint16_t *)(spibar + 0x56));
+		printf_debug("0x58: 0x%08x (OPMENU)\n", *(uint32_t *)(spibar + 0x58));
+		printf_debug("0x5c: 0x%08x (OPMENU+4)\n", *(uint32_t *)(spibar + 0x5c));
 		for (i=0; i < 4; i++) {
 			int offs;
 			offs = 0x60 + (i * 4);
-			printf_debug("0x%02x: 0x%08x (PBR%d)\n", offs, *(uint32_t *)(ich_spibar + offs), i);
+			printf_debug("0x%02x: 0x%08x (PBR%d)\n", offs, *(uint32_t *)(spibar + offs), i);
 		}
 		printf_debug("\n");
-		if ( (*(uint16_t *)ich_spibar) & (1 << 15)) {
+		if ( (*(uint16_t *)spibar) & (1 << 15)) {
 			printf("WARNING: SPI Configuration Lockdown activated.\n");
 		}
+		break;
+	case BUS_TYPE_ICH9_SPI:
+		/* TODO: Add dumping function for ICH8/ICH9, or drop the 
+		 * whole SPIBAR dumping from chipset_enable.c - There's 
+		 * inteltool for this task already.
+		 */
+		break;
+	default:
+		/* Nothing */
+		break;
 	}
 
 	old = pci_read_byte(dev, 0xdc);
@@ -277,38 +331,30 @@ static int enable_flash_ich_dc_spi(struct pci_dev *dev, const char *name, unsign
 	case 1:
 	case 2:
 		printf_debug("prefetching %sabled, caching %sabled, ",
-			(new & 0x2) ? "en" : "dis", (new & 0x1) ? "dis" : "en");
+			(new & 0x2) ? "en" : "dis", 
+			(new & 0x1) ? "dis" : "en");
 		break;
 	default:
 		printf_debug("invalid prefetching/caching settings, ");
 		break;
 	}
-	return enable_flash_ich_dc(dev, name);
-}
 
-/* Flag for ICH7 SPI register block */
-int ich7_detected = 0;
-int viaspi_detected = 0;
+	return ret;
+}
 
 static int enable_flash_ich7(struct pci_dev *dev, const char *name)
 {
-       ich7_detected = 1;
-	return enable_flash_ich_dc_spi(dev, name, 0x3020);
+	return enable_flash_ich_dc_spi(dev, name, 7);
 }
 
-/* Flag for ICH8/ICH9 SPI register block */
-int ich9_detected = 0;
-
 static int enable_flash_ich8(struct pci_dev *dev, const char *name)
 {
-	ich9_detected = 1;
-	return enable_flash_ich_dc_spi(dev, name, 0x3020);
+	return enable_flash_ich_dc_spi(dev, name, 8);
 }
 
 static int enable_flash_ich9(struct pci_dev *dev, const char *name)
 {
-	ich9_detected = 1;
-	return enable_flash_ich_dc_spi(dev, name, 0x3800);
+	return enable_flash_ich_dc_spi(dev, name, 9);
 }
 
 static int enable_flash_vt823x(struct pci_dev *dev, const char *name)

flash.h

@@ -370,10 +370,17 @@ void print_supported_boards(void);
 /* chipset_enable.c */
 int chipset_flash_enable(void);
 void print_supported_chipsets(void);
-extern int ich7_detected;
-extern int viaspi_detected;
-extern int ich9_detected;
-extern void *ich_spibar;
+
+typedef enum {
+	BUS_TYPE_LPC,
+	BUS_TYPE_ICH7_SPI,
+	BUS_TYPE_ICH9_SPI,
+	BUS_TYPE_IT87XX_SPI,
+	BUS_TYPE_VIA_SPI
+} flashbus_t;
+
+extern flashbus_t flashbus;
+extern void *spibar;
 
 /* Physical memory mapping device */
 #if defined (__sun) && (defined(__i386) || defined(__amd64))

ichspi.c

@@ -131,20 +131,20 @@ static OPCODES *curopcodes = NULL;
 static inline uint32_t REGREAD32(int X)
 {
 	volatile uint32_t regval;
-	regval = *(volatile uint32_t *) ((uint8_t *) ich_spibar + X);
+	regval = *(volatile uint32_t *) ((uint8_t *) spibar + X);
 	return regval;
 }
 
 static inline uint16_t REGREAD16(int X)
 {
 	volatile uint16_t regval;
-	regval = *(volatile uint16_t *) ((uint8_t *) ich_spibar + X);
+	regval = *(volatile uint16_t *) ((uint8_t *) spibar + X);
 	return regval;
 }
 
-#define REGWRITE32(X,Y) (*(uint32_t *)((uint8_t *)ich_spibar+X)=Y)
-#define REGWRITE16(X,Y) (*(uint16_t *)((uint8_t *)ich_spibar+X)=Y)
-#define REGWRITE8(X,Y)  (*(uint8_t *)((uint8_t *)ich_spibar+X)=Y)
+#define REGWRITE32(X,Y) (*(uint32_t *)((uint8_t *)spibar+X)=Y)
+#define REGWRITE16(X,Y) (*(uint16_t *)((uint8_t *)spibar+X)=Y)
+#define REGWRITE8(X,Y)  (*(uint8_t *)((uint8_t *)spibar+X)=Y)
 
 /* Common SPI functions */
 static int program_opcodes(OPCODES * op);
@@ -175,58 +175,51 @@ OPCODES O_ST_M25P = {
 int program_opcodes(OPCODES * op)
 {
 	uint8_t a;
-	uint16_t temp16;
-	uint32_t temp32;
+	uint16_t preop, optype;
+	uint32_t opmenu[2];
 
 	/* Program Prefix Opcodes */
-	temp16 = 0;
+	preop = 0;
 	/* 0:7 Prefix Opcode 1 */
-	temp16 = (op->preop[0]);
+	preop = (op->preop[0]);
 	/* 8:16 Prefix Opcode 2 */
-	temp16 |= ((uint16_t) op->preop[1]) << 8;
-	if ((ich7_detected) || (viaspi_detected)) {
-		REGWRITE16(ICH7_REG_PREOP, temp16);
-	} else if (ich9_detected) {
-		REGWRITE16(ICH9_REG_PREOP, temp16);
-	}
-
+	preop |= ((uint16_t) op->preop[1]) << 8;
+	
 	/* Program Opcode Types 0 - 7 */
-	temp16 = 0;
+	optype = 0;
 	for (a = 0; a < 8; a++) {
-		temp16 |= ((uint16_t) op->opcode[a].spi_type) << (a * 2);
-	}
-
-	if ((ich7_detected) || (viaspi_detected)) {
-		REGWRITE16(ICH7_REG_OPTYPE, temp16);
-	} else if (ich9_detected) {
-		REGWRITE16(ICH9_REG_OPTYPE, temp16);
+		optype |= ((uint16_t) op->opcode[a].spi_type) << (a * 2);
 	}
-
-
+	
 	/* Program Allowable Opcodes 0 - 3 */
-	temp32 = 0;
+	opmenu[0] = 0;
 	for (a = 0; a < 4; a++) {
-		temp32 |= ((uint32_t) op->opcode[a].opcode) << (a * 8);
+		opmenu[0] |= ((uint32_t) op->opcode[a].opcode) << (a * 8);
 	}
 
-	if ((ich7_detected) || (viaspi_detected)) {
-		REGWRITE32(ICH7_REG_OPMENU, temp32);
-	} else if (ich9_detected) {
-		REGWRITE32(ICH9_REG_OPMENU, temp32);
-	}
-
-
 	/*Program Allowable Opcodes 4 - 7 */
-	temp32 = 0;
+	opmenu[1] = 0;
 	for (a = 4; a < 8; a++) {
-		temp32 |=
-		    ((uint32_t) op->opcode[a].opcode) << ((a - 4) * 8);
-	}
-
-	if ((ich7_detected) || (viaspi_detected)) {
-		REGWRITE32(ICH7_REG_OPMENU + 4, temp32);
-	} else if (ich9_detected) {
-		REGWRITE32(ICH9_REG_OPMENU + 4, temp32);
+		opmenu[1] |= ((uint32_t) op->opcode[a].opcode) << ((a - 4) * 8);
+	}
+
+	switch (flashbus) {
+	case BUS_TYPE_ICH7_SPI: 
+	case BUS_TYPE_VIA_SPI: 
+		REGWRITE16(ICH7_REG_PREOP, preop);
+		REGWRITE16(ICH7_REG_OPTYPE, optype);
+		REGWRITE32(ICH7_REG_OPMENU, opmenu[0]);
+		REGWRITE32(ICH7_REG_OPMENU + 4, opmenu[1]);
+		break;
+	case BUS_TYPE_ICH9_SPI:
+		REGWRITE16(ICH9_REG_PREOP, preop);
+		REGWRITE16(ICH9_REG_OPTYPE, optype);
+		REGWRITE32(ICH9_REG_OPMENU, opmenu[0]);
+		REGWRITE32(ICH9_REG_OPMENU + 4, opmenu[1]);
+		break;
+	default:
+		printf_debug("%s: unsupported chipset\n", __FUNCTION__);
+		return -1;
 	}
 
 	return 0;
@@ -340,6 +333,7 @@ static int ich9_run_opcode(uint8_t nr, OPCODE op, uint32_t offset,
 			   uint8_t datalength, uint8_t * data)
 {
 	int write_cmd = 0;
+	int timeout;
 	uint32_t temp32;
 	uint32_t a;
 
@@ -410,9 +404,12 @@ static int ich9_run_opcode(uint8_t nr, OPCODE op, uint32_t offset,
 	REGWRITE32(ICH9_REG_SSFS, temp32);
 
 	/*wait for cycle complete */
-	while ((REGREAD32(ICH9_REG_SSFS) & SSFS_CDS) == 0) {
-		/*TODO; Do something that this can't lead into an endless loop. but some
-		 * commands may cause this to be last more than 30 seconds */
+	timeout = 1000 * 60;	// 60s is a looong timeout.
+	while (((REGREAD32(ICH9_REG_SSFS) & SSFS_CDS) == 0) && --timeout) {
+		myusec_delay(1000);
+	}
+	if (!timeout) {
+		printf_debug("timeout\n");
 	}
 
 	if ((REGREAD32(ICH9_REG_SSFS) & SSFS_FCERR) != 0) {
@@ -438,12 +435,16 @@ static int ich9_run_opcode(uint8_t nr, OPCODE op, uint32_t offset,
 static int run_opcode(uint8_t nr, OPCODE op, uint32_t offset,
 		      uint8_t datalength, uint8_t * data)
 {
-	if (ich7_detected)
-		return ich7_run_opcode(nr, op, offset, datalength, data, 64);
-	else if (viaspi_detected)
+	switch (flashbus) {
+	case BUS_TYPE_VIA_SPI:
 		return ich7_run_opcode(nr, op, offset, datalength, data, 16);
-	else if (ich9_detected)
+	case BUS_TYPE_ICH7_SPI:
+		return ich7_run_opcode(nr, op, offset, datalength, data, 64);
+	case BUS_TYPE_ICH9_SPI:
 		return ich9_run_opcode(nr, op, offset, datalength, data);
+	default:
+		printf_debug("%s: unsupported chipset\n", __FUNCTION__);
+	}
 
 	/* If we ever get here, something really weird happened */
 	return -1;
@@ -541,7 +542,7 @@ int ich_spi_read(struct flashchip *flash, uint8_t * buf)
 	int page_size = flash->page_size;
 	int maxdata = 64;
 
-	if (viaspi_detected) {
+	if (flashbus == BUS_TYPE_VIA_SPI) {
 		maxdata = 16;
 	}
 
@@ -572,7 +573,7 @@ int ich_spi_write(struct flashchip *flash, uint8_t * buf)
 			break;
 		}
 
-	if (viaspi_detected) {
+	if (flashbus == BUS_TYPE_VIA_SPI) {
 		maxdata = 16;
 	}
 		for (j = 0; j < erase_size / page_size; j++) {

it87spi.c

@@ -3,6 +3,7 @@
  *
  * Copyright (C) 2007, 2008 Carl-Daniel Hailfinger
  * Copyright (C) 2008 Ronald Hoogenboom <ronald@zonnet.nl>
+ * Copyright (C) 2008 coresystems GmbH
  *
  * 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
@@ -112,8 +113,13 @@ static uint16_t find_ite_spi_flash_port(uint16_t port)
 int it87xx_probe_spi_flash(const char *name)
 {
 	it8716f_flashport = find_ite_spi_flash_port(ITE_SUPERIO_PORT1);
+
 	if (!it8716f_flashport)
 		it8716f_flashport = find_ite_spi_flash_port(ITE_SUPERIO_PORT2);
+
+	if (it8716f_flashport)
+		flashbus = BUS_TYPE_IT87XX_SPI;
+
 	return (!it8716f_flashport);
 }
 

spi.c

@@ -34,13 +34,16 @@ void spi_prettyprint_status_register(struct flashchip *flash);
 
 int spi_command(unsigned int writecnt, unsigned int readcnt, const unsigned char *writearr, unsigned char *readarr)
 {
-	if (it8716f_flashport)
+	switch (flashbus) {
+	case BUS_TYPE_IT87XX_SPI:
 		return it8716f_spi_command(writecnt, readcnt, writearr, readarr);
-	else if ((ich7_detected) || (viaspi_detected))
-		return ich_spi_command(writecnt, readcnt, writearr, readarr);
-	else if (ich9_detected)
-		return ich_spi_command(writecnt, readcnt, writearr, readarr);
-	printf_debug("%s called, but no SPI chipset detected\n", __FUNCTION__);
+	case BUS_TYPE_ICH7_SPI:
+	case BUS_TYPE_ICH9_SPI:
+	case BUS_TYPE_VIA_SPI:
+               return ich_spi_command(writecnt, readcnt, writearr, readarr);
+	default:
+		printf_debug("%s called, but no SPI chipset/strapping detected\n", __FUNCTION__);
+	}
 	return 1;
 }
 
@@ -135,9 +138,16 @@ int probe_spi_rdid(struct flashchip *flash) {
 int probe_spi_rdid4(struct flashchip *flash) {
 
 	/* only some SPI chipsets support 4 bytes commands */
-	if (!((ich7_detected) || (ich9_detected) || (viaspi_detected)))
-		return 0;
-	return probe_spi_rdid_generic(flash, 4);
+	switch (flashbus) {
+	case BUS_TYPE_ICH7_SPI:
+	case BUS_TYPE_ICH9_SPI:
+	case BUS_TYPE_VIA_SPI:
+		return probe_spi_rdid_generic(flash, 4);
+	default:
+		printf_debug("4b ID not supported on this SPI controller\n");
+	}
+
+	return 0;
 }
 
 int probe_spi_res(struct flashchip *flash)
@@ -316,11 +326,17 @@ int spi_sector_erase(const struct flashchip *flash, unsigned long addr)
 
 void spi_page_program(int block, uint8_t *buf, uint8_t *bios)
 {
-	if (it8716f_flashport) {
+	switch (flashbus) {
+	case BUS_TYPE_IT87XX_SPI:
 		it8716f_spi_page_program(block, buf, bios);
-		return;
+		break;
+	case BUS_TYPE_ICH7_SPI:
+	case BUS_TYPE_ICH9_SPI:
+		printf_debug("%s called, but not implemented for ICH\n", __FUNCTION__);
+		break;
+	default:
+		printf_debug("%s called, but no SPI chipset/strapping detected\n", __FUNCTION__);
 	}
-	printf_debug("%s called, but no SPI chipset detected\n", __FUNCTION__);
 }
 
 /*
@@ -375,25 +391,34 @@ void spi_nbyte_read(int address, uint8_t *bytes, int len)
 
 int spi_chip_read(struct flashchip *flash, uint8_t *buf)
 {
-	if (it8716f_flashport)
+
+	switch (flashbus) {
+	case BUS_TYPE_IT87XX_SPI:
 		return it8716f_spi_chip_read(flash, buf);
-	else if ((ich7_detected) || (viaspi_detected))
-		return ich_spi_read(flash, buf);
-	else if (ich9_detected)
+	case BUS_TYPE_ICH7_SPI:
+	case BUS_TYPE_ICH9_SPI:
+	case BUS_TYPE_VIA_SPI:
 		return ich_spi_read(flash, buf);
-	printf_debug("%s called, but no SPI chipset detected\n", __FUNCTION__);
+	default:
+		printf_debug("%s called, but no SPI chipset/strapping detected\n", __FUNCTION__);
+	}
+
 	return 1;
 }
 
 int spi_chip_write(struct flashchip *flash, uint8_t *buf)
 {
-	if (it8716f_flashport)
+	switch (flashbus) {
+	case BUS_TYPE_IT87XX_SPI:
 		return it8716f_spi_chip_write(flash, buf);
-	else if ((ich7_detected) || (viaspi_detected))
+	case BUS_TYPE_ICH7_SPI:
+	case BUS_TYPE_ICH9_SPI:
+	case BUS_TYPE_VIA_SPI:
 		return ich_spi_write(flash, buf);
-	else if (ich9_detected)
-		return ich_spi_write(flash, buf);
-	printf_debug("%s called, but no SPI chipset detected\n", __FUNCTION__);
+	default:
+		printf_debug("%s called, but no SPI chipset/strapping detected\n", __FUNCTION__);
+	}
+
 	return 1;
 }