Only probe for chips with compatible bus protocols

It doesn't make sense to probe for SPI chips on a LPC host, nor does it
make sense to probe for LPC chips on a Parallel host.

This change is backwards compatible, but adding host protocol info to
chipset init functions will speed up probing.

Once all chipset init functions are updated and the Winbond W29EE011 and
AMIC A49LF040A chip definitions are updated, the W29EE011 workaround can
be deleted as the W29/A49 conflict magically disappears.

Corresponding to flashrom svn r560.

Signed-off-by: Carl-Daniel Hailfinger <c-d.hailfinger.devel.2006@gmx.net>
Tested on real hardware and
Acked-by: Uwe Hermann <uwe@hermann-uwe.de>

6 files changed, 86 insertions, 9 deletions

diff --git a/chipset_enable.c b/chipset_enable.c
index 54364930..8fdabdc5 100644
--- a/chipset_enable.c
+++ b/chipset_enable.c
@@ -36,13 +36,12 @@
 unsigned long flashbase = 0;
 
 /**
- * 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.
+ * flashrom defaults to Parallel/LPC/FWH flash devices. If a known host
+ * controller is found, the init routine sets the buses_supported bitfield to
+ * contain the supported buses for that controller.
  */
 
-enum chipbustype buses_supported = CHIP_BUSTYPE_UNKNOWN;
+enum chipbustype buses_supported = CHIP_BUSTYPE_NONSPI;
 
 extern int ichspi_lock;
 
@@ -217,6 +216,8 @@ static int enable_flash_vt8237s_spi(struct pci_dev *dev, const char *name)
 	printf_debug("0x6c: 0x%04x     (CLOCK/DEBUG)\n",
 		     mmio_readw(spibar + 0x6c));
 
+	/* Not sure if it speaks all these bus protocols. */
+	buses_supported = CHIP_BUSTYPE_LPC | CHIP_BUSTYPE_FWH | CHIP_BUSTYPE_SPI;
 	spi_controller = SPI_CONTROLLER_VIA;
 	ich_init_opcodes();
 
@@ -262,22 +263,29 @@ static int enable_flash_ich_dc_spi(struct pci_dev *dev, const char *name,
 	 */
 
 	if (ich_generation == 7 && bbs == ICH_STRAP_LPC) {
+		/* Not sure if it speaks LPC as well. */
+		buses_supported = CHIP_BUSTYPE_LPC | CHIP_BUSTYPE_FWH;
 		/* No further SPI initialization required */
 		return ret;
 	}
 
 	switch (ich_generation) {
 	case 7:
+		buses_supported = CHIP_BUSTYPE_SPI;
 		spi_controller = SPI_CONTROLLER_ICH7;
 		spibar_offset = 0x3020;
 		break;
 	case 8:
+		/* Not sure if it speaks LPC as well. */
+		buses_supported = CHIP_BUSTYPE_LPC | CHIP_BUSTYPE_FWH | CHIP_BUSTYPE_SPI;
 		spi_controller = SPI_CONTROLLER_ICH9;
 		spibar_offset = 0x3020;
 		break;
 	case 9:
 	case 10:
 	default:		/* Future version might behave the same */
+		/* Not sure if it speaks LPC as well. */
+		buses_supported = CHIP_BUSTYPE_LPC | CHIP_BUSTYPE_FWH | CHIP_BUSTYPE_SPI;
 		spi_controller = SPI_CONTROLLER_ICH9;
 		spibar_offset = 0x3800;
 		break;
@@ -727,8 +735,11 @@ static int enable_flash_sb600(struct pci_dev *dev, const char *name)
 			has_spi = 0;
 	}
 
-	if (has_spi)
+	buses_supported = CHIP_BUSTYPE_LPC | CHIP_BUSTYPE_FWH;
+	if (has_spi) {
+		buses_supported |= CHIP_BUSTYPE_SPI;
 		spi_controller = SPI_CONTROLLER_SB600;
+	}
 
 	/* Read ROM strap override register. */
 	OUTB(0x8f, 0xcd6);
diff --git a/flashrom.c b/flashrom.c
index 0eb502d8..c7e17d37 100644
--- a/flashrom.c
+++ b/flashrom.c
@@ -174,10 +174,51 @@ int read_memmapped(struct flashchip *flash, uint8_t *buf)
 	return 0;
 }
 
+char *strcat_realloc(char *dest, const char *src)
+{
+	dest = realloc(dest, strlen(dest) + strlen(src) + 1);
+	if (!dest)
+		return NULL;
+	strcat(dest, src);
+	return dest;
+}
+
+/* Return a string corresponding to the bustype parameter.
+ * Memory is obtained with malloc() and can be freed with free().
+ */
+char *flashbuses_to_text(enum chipbustype bustype)
+{
+	char *ret = calloc(1, 1);
+	if (bustype == CHIP_BUSTYPE_UNKNOWN) {
+		ret = strcat_realloc(ret, "Unknown,");
+	/* FIXME: Once all chipsets and flash chips have been updated, NONSPI
+	 * will cease to exist and should be eliminated here as well.
+	 */
+	} else if (bustype == CHIP_BUSTYPE_NONSPI) {
+		ret = strcat_realloc(ret, "Non-SPI,");
+	} else {
+		if (bustype & CHIP_BUSTYPE_PARALLEL)
+			ret = strcat_realloc(ret, "Parallel,");
+		if (bustype & CHIP_BUSTYPE_LPC)
+			ret = strcat_realloc(ret, "LPC,");
+		if (bustype & CHIP_BUSTYPE_FWH)
+			ret = strcat_realloc(ret, "FWH,");
+		if (bustype & CHIP_BUSTYPE_SPI)
+			ret = strcat_realloc(ret, "SPI,");
+		if (bustype == CHIP_BUSTYPE_NONE)
+			ret = strcat_realloc(ret, "None,");
+	}
+	/* Kill last comma. */
+	ret[strlen(ret) - 1] = '\0';
+	ret = realloc(ret, strlen(ret) + 1);
+	return ret;
+}
+
 struct flashchip *probe_flash(struct flashchip *first_flash, int force)
 {
 	struct flashchip *flash;
 	unsigned long base = 0, size;
+	char *tmp;
 
 	for (flash = first_flash; flash && flash->name; flash++) {
 		if (chip_to_probe && strcmp(flash->name, chip_to_probe) != 0)
@@ -188,6 +229,15 @@ struct flashchip *probe_flash(struct flashchip *first_flash, int force)
 			printf_debug("failed! flashrom has no probe function for this flash chip.\n");
 			continue;
 		}
+		if (!(buses_supported & flash->bustype)) {
+			tmp = flashbuses_to_text(buses_supported);
+			printf_debug("skipped. Host bus type %s ", tmp);
+			free(tmp);
+			tmp = flashbuses_to_text(flash->bustype);
+			printf_debug("and chip bus type %s are incompatible.\n", tmp);
+			free(tmp);
+			continue;
+		}
 
 		size = flash->total_size * 1024;
 
diff --git a/it87spi.c b/it87spi.c
index d9f93e63..2528b91b 100644
--- a/it87spi.c
+++ b/it87spi.c
@@ -109,14 +109,23 @@ int it87spi_common_init(void)
 
 int it87spi_init(void)
 {
-	get_io_perms();
+	int ret;
 
-	return it87spi_common_init();
+	get_io_perms();
+	ret = it87spi_common_init();
+	if (!ret)
+		buses_supported = CHIP_BUSTYPE_SPI;
+	return ret;
 }
 
 int it87xx_probe_spi_flash(const char *name)
 {
-	return it87spi_common_init();
+	int ret;
+
+	ret = it87spi_common_init();
+	if (!ret)
+		buses_supported |= CHIP_BUSTYPE_SPI;
+	return ret;
 }
 
 /*
diff --git a/nic3com.c b/nic3com.c
index c6341ed7..a68bd8ca 100644
--- a/nic3com.c
+++ b/nic3com.c
@@ -81,6 +81,8 @@ int nic3com_init(void)
 	 */
 	OUTW(SELECT_REG_WINDOW + 0, io_base_addr + INT_STATUS);
 
+	buses_supported = CHIP_BUSTYPE_PARALLEL;
+
 	return 0;
 }
 
diff --git a/satasii.c b/satasii.c
index d971b24f..ba211cc7 100644
--- a/satasii.c
+++ b/satasii.c
@@ -67,6 +67,8 @@ int satasii_init(void)
 	if ((id != 0x0680) && (!(mmio_readl(sii_bar) & (1 << 26))))
 		printf("Warning: Flash seems unconnected.\n");
 
+	buses_supported = CHIP_BUSTYPE_PARALLEL;
+
 	return 0;
 }
 
diff --git a/wbsio_spi.c b/wbsio_spi.c
index 2df5bddd..045aa0ec 100644
--- a/wbsio_spi.c
+++ b/wbsio_spi.c
@@ -63,7 +63,10 @@ int wbsio_check_for_spi(const char *name)
 			return 1;
 
 	printf_debug("\nwbsio_spibase = 0x%x\n", wbsio_spibase);
+
+	buses_supported |= CHIP_BUSTYPE_SPI;
 	spi_controller = SPI_CONTROLLER_WBSIO;
+
 	return 0;
 }