1 files changed, 82 insertions, 44 deletions

diff --git a/drivers/mtd/spi/spi_flash.c b/drivers/mtd/spi/spi_flash.c
index ea875dc812b..b4ba1dda51d 100644
--- a/drivers/mtd/spi/spi_flash.c
+++ b/drivers/mtd/spi/spi_flash.c
@@ -2,6 +2,8 @@
  * SPI flash interface
  *
  * Copyright (C) 2008 Atmel Corporation
+ * Copyright (C) 2010 Reinhard Meyer, EMK Elektronik
+ *
  * Licensed under the GPL-2 or later.
  */
 
@@ -96,13 +98,68 @@ int spi_flash_read_common(struct spi_flash *flash, const u8 *cmd,
 	return ret;
 }
 
+/*
+ * The following table holds all device probe functions
+ *
+ * shift:  number of continuation bytes before the ID
+ * idcode: the expected IDCODE or 0xff for non JEDEC devices
+ * probe:  the function to call
+ *
+ * Non JEDEC devices should be ordered in the table such that
+ * the probe functions with best detection algorithms come first.
+ *
+ * Several matching entries are permitted, they will be tried
+ * in sequence until a probe function returns non NULL.
+ *
+ * IDCODE_CONT_LEN may be redefined if a device needs to declare a
+ * larger "shift" value.  IDCODE_PART_LEN generally shouldn't be
+ * changed.  This is the max number of bytes probe functions may
+ * examine when looking up part-specific identification info.
+ *
+ * Probe functions will be given the idcode buffer starting at their
+ * manu id byte (the "idcode" in the table below).  In other words,
+ * all of the continuation bytes will be skipped (the "shift" below).
+ */
+#define IDCODE_CONT_LEN 0
+#define IDCODE_PART_LEN 5
+static const struct {
+	const u8 shift;
+	const u8 idcode;
+	struct spi_flash *(*probe) (struct spi_slave *spi, u8 *idcode);
+} flashes[] = {
+	/* Keep it sorted by define name */
+#ifdef CONFIG_SPI_FLASH_ATMEL
+	{ 0, 0x1f, spi_flash_probe_atmel, },
+#endif
+#ifdef CONFIG_SPI_FLASH_MACRONIX
+	{ 0, 0xc2, spi_flash_probe_macronix, },
+#endif
+#ifdef CONFIG_SPI_FLASH_SPANSION
+	{ 0, 0x01, spi_flash_probe_spansion, },
+#endif
+#ifdef CONFIG_SPI_FLASH_SST
+	{ 0, 0xbf, spi_flash_probe_sst, },
+#endif
+#ifdef CONFIG_SPI_FLASH_STMICRO
+	{ 0, 0x20, spi_flash_probe_stmicro, },
+#endif
+#ifdef CONFIG_SPI_FLASH_WINBOND
+	{ 0, 0xef, spi_flash_probe_winbond, },
+#endif
+	/* Keep it sorted by best detection */
+#ifdef CONFIG_SPI_FLASH_STMICRO
+	{ 0, 0xff, spi_flash_probe_stmicro, },
+#endif
+};
+#define IDCODE_LEN (IDCODE_CONT_LEN + IDCODE_PART_LEN)
+
 struct spi_flash *spi_flash_probe(unsigned int bus, unsigned int cs,
 		unsigned int max_hz, unsigned int spi_mode)
 {
 	struct spi_slave *spi;
-	struct spi_flash *flash;
-	int ret;
-	u8 idcode[5];
+	struct spi_flash *flash = NULL;
+	int ret, i, shift;
+	u8 idcode[IDCODE_LEN], *idp;
 
 	spi = spi_setup_slave(bus, cs, max_hz, spi_mode);
 	if (!spi) {
@@ -117,53 +174,34 @@ struct spi_flash *spi_flash_probe(unsigned int bus, unsigned int cs,
 	}
 
 	/* Read the ID codes */
-	ret = spi_flash_cmd(spi, CMD_READ_ID, &idcode, sizeof(idcode));
+	ret = spi_flash_cmd(spi, CMD_READ_ID, idcode, sizeof(idcode));
 	if (ret)
 		goto err_read_id;
 
-	debug("SF: Got idcode %02x %02x %02x %02x %02x\n", idcode[0],
-			idcode[1], idcode[2], idcode[3], idcode[4]);
-
-	switch (idcode[0]) {
-#ifdef CONFIG_SPI_FLASH_SPANSION
-	case 0x01:
-		flash = spi_flash_probe_spansion(spi, idcode);
-		break;
+#ifdef DEBUG
+	printf("SF: Got idcodes\n");
+	print_buffer(0, idcode, 1, sizeof(idcode), 0);
 #endif
-#ifdef CONFIG_SPI_FLASH_ATMEL
-	case 0x1F:
-		flash = spi_flash_probe_atmel(spi, idcode);
-		break;
-#endif
-#ifdef CONFIG_SPI_FLASH_MACRONIX
-	case 0xc2:
-		flash = spi_flash_probe_macronix(spi, idcode);
-		break;
-#endif
-#ifdef CONFIG_SPI_FLASH_WINBOND
-	case 0xef:
-		flash = spi_flash_probe_winbond(spi, idcode);
-		break;
-#endif
-#ifdef CONFIG_SPI_FLASH_STMICRO
-	case 0x20:
-	case 0xff: /* Let the stmicro func handle non-JEDEC ids */
-		flash = spi_flash_probe_stmicro(spi, idcode);
-		break;
-#endif
-#ifdef CONFIG_SPI_FLASH_SST
-	case 0xBF:
-		flash = spi_flash_probe_sst(spi, idcode);
-		break;
-#endif
-	default:
-		printf("SF: Unsupported manufacturer %02X\n", idcode[0]);
-		flash = NULL;
-		break;
-	}
 
-	if (!flash)
+	/* count the number of continuation bytes */
+	for (shift = 0, idp = idcode;
+	     shift < IDCODE_CONT_LEN && *idp == 0x7f;
+	     ++shift, ++idp)
+		continue;
+
+	/* search the table for matches in shift and id */
+	for (i = 0; i < ARRAY_SIZE(flashes); ++i)
+		if (flashes[i].shift == shift && flashes[i].idcode == *idp) {
+			/* we have a match, call probe */
+			flash = flashes[i].probe(spi, idp);
+			if (flash)
+				break;
+		}
+
+	if (!flash) {
+		printf("SF: Unsupported manufacturer %02x\n", *idp);
 		goto err_manufacturer_probe;
+	}
 
 	spi_release_bus(spi);