openwrt/package/boot/uboot-lantiq/patches/0003-sf-factor-out-malloc-from-SPI-flash-drivers.patch

From 73d127565b5a4b19bcaacabc505689ee039f16fd Mon Sep 17 00:00:00 2001
From: Daniel Schwierzeck <daniel.schwierzeck@gmail.com>
Date: Sun, 11 Nov 2012 03:11:38 +0100
Subject: sf: factor out malloc from SPI flash drivers

Signed-off-by: Daniel Schwierzeck <daniel.schwierzeck@gmail.com>

--- a/drivers/mtd/spi/atmel.c
+++ b/drivers/mtd/spi/atmel.c
@@ -40,18 +40,6 @@ struct atmel_spi_flash_params {
 	const char	*name;
 };
 
-/* spi_flash needs to be first so upper layers can free() it */
-struct atmel_spi_flash {
-	struct spi_flash flash;
-	const struct atmel_spi_flash_params *params;
-};
-
-static inline struct atmel_spi_flash *
-to_atmel_spi_flash(struct spi_flash *flash)
-{
-	return container_of(flash, struct atmel_spi_flash, flash);
-}
-
 static const struct atmel_spi_flash_params atmel_spi_flash_table[] = {
 	{
 		.idcode1		= 0x22,
@@ -156,7 +144,8 @@ static int at45_wait_ready(struct spi_fl
  * Assemble the address part of a command for AT45 devices in
  * non-power-of-two page size mode.
  */
-static void at45_build_address(struct atmel_spi_flash *asf, u8 *cmd, u32 offset)
+static void at45_build_address(const struct atmel_spi_flash_params *params,
+				u8 *cmd, u32 offset)
 {
 	unsigned long page_addr;
 	unsigned long byte_addr;
@@ -167,7 +156,7 @@ static void at45_build_address(struct at
 	 * The "extra" space per page is the power-of-two page size
 	 * divided by 32.
 	 */
-	page_shift = asf->params->l2_page_size;
+	page_shift = params->l2_page_size;
 	page_size = (1 << page_shift) + (1 << (page_shift - 5));
 	page_shift++;
 	page_addr = offset / page_size;
@@ -181,11 +170,11 @@ static void at45_build_address(struct at
 static int dataflash_read_fast_at45(struct spi_flash *flash,
 		u32 offset, size_t len, void *buf)
 {
-	struct atmel_spi_flash *asf = to_atmel_spi_flash(flash);
+	const struct atmel_spi_flash_params *params = flash->priv;
 	u8 cmd[5];
 
 	cmd[0] = CMD_READ_ARRAY_FAST;
-	at45_build_address(asf, cmd + 1, offset);
+	at45_build_address(params, cmd + 1, offset);
 	cmd[4] = 0x00;
 
 	return spi_flash_read_common(flash, cmd, sizeof(cmd), buf, len);
@@ -197,7 +186,7 @@ static int dataflash_read_fast_at45(stru
 static int dataflash_write_p2(struct spi_flash *flash,
 		u32 offset, size_t len, const void *buf)
 {
-	struct atmel_spi_flash *asf = to_atmel_spi_flash(flash);
+	const struct atmel_spi_flash_params *params = flash->priv;
 	unsigned long page_size;
 	u32 addr = offset;
 	size_t chunk_len;
@@ -211,7 +200,7 @@ static int dataflash_write_p2(struct spi
 	 * the other is being programmed into main memory.
 	 */
 
-	page_size = (1 << asf->params->l2_page_size);
+	page_size = (1 << params->l2_page_size);
 
 	ret = spi_claim_bus(flash->spi);
 	if (ret) {
@@ -263,7 +252,7 @@ out:
 static int dataflash_write_at45(struct spi_flash *flash,
 		u32 offset, size_t len, const void *buf)
 {
-	struct atmel_spi_flash *asf = to_atmel_spi_flash(flash);
+	const struct atmel_spi_flash_params *params = flash->priv;
 	unsigned long page_addr;
 	unsigned long byte_addr;
 	unsigned long page_size;
@@ -279,7 +268,7 @@ static int dataflash_write_at45(struct s
 	 * the other is being programmed into main memory.
 	 */
 
-	page_shift = asf->params->l2_page_size;
+	page_shift = params->l2_page_size;
 	page_size = (1 << page_shift) + (1 << (page_shift - 5));
 	page_shift++;
 	page_addr = offset / page_size;
@@ -338,7 +327,7 @@ out:
  */
 static int dataflash_erase_p2(struct spi_flash *flash, u32 offset, size_t len)
 {
-	struct atmel_spi_flash *asf = to_atmel_spi_flash(flash);
+	const struct atmel_spi_flash_params *params = flash->priv;
 	unsigned long page_size;
 
 	size_t actual;
@@ -351,7 +340,7 @@ static int dataflash_erase_p2(struct spi
 	 * when possible.
 	 */
 
-	page_size = (1 << asf->params->l2_page_size);
+	page_size = (1 << params->l2_page_size);
 
 	if (offset % page_size || len % page_size) {
 		debug("SF: Erase offset/length not multiple of page size\n");
@@ -397,7 +386,7 @@ out:
 
 static int dataflash_erase_at45(struct spi_flash *flash, u32 offset, size_t len)
 {
-	struct atmel_spi_flash *asf = to_atmel_spi_flash(flash);
+	const struct atmel_spi_flash_params *params = flash->priv;
 	unsigned long page_addr;
 	unsigned long page_size;
 	unsigned int page_shift;
@@ -411,7 +400,7 @@ static int dataflash_erase_at45(struct s
 	 * when possible.
 	 */
 
-	page_shift = asf->params->l2_page_size;
+	page_shift = params->l2_page_size;
 	page_size = (1 << page_shift) + (1 << (page_shift - 5));
 	page_shift++;
 	page_addr = offset / page_size;
@@ -458,12 +447,12 @@ out:
 	return ret;
 }
 
-struct spi_flash *spi_flash_probe_atmel(struct spi_slave *spi, u8 *idcode)
+int spi_flash_probe_atmel(struct spi_flash *flash, u8 *idcode)
 {
 	const struct atmel_spi_flash_params *params;
+	struct spi_slave *spi = flash->spi;
 	unsigned page_size;
 	unsigned int family;
-	struct atmel_spi_flash *asf;
 	unsigned int i;
 	int ret;
 	u8 status;
@@ -477,18 +466,11 @@ struct spi_flash *spi_flash_probe_atmel(
 	if (i == ARRAY_SIZE(atmel_spi_flash_table)) {
 		debug("SF: Unsupported DataFlash ID %02x\n",
 				idcode[1]);
-		return NULL;
-	}
-
-	asf = malloc(sizeof(struct atmel_spi_flash));
-	if (!asf) {
-		debug("SF: Failed to allocate memory\n");
-		return NULL;
+		return 0;
 	}
 
-	asf->params = params;
-	asf->flash.spi = spi;
-	asf->flash.name = params->name;
+	flash->priv = (void *)params;
+	flash->name = params->name;
 
 	/* Assuming power-of-two page size initially. */
 	page_size = 1 << params->l2_page_size;
@@ -503,48 +485,44 @@ struct spi_flash *spi_flash_probe_atmel(
 		 */
 		ret = spi_flash_cmd(spi, CMD_AT45_READ_STATUS, &status, 1);
 		if (ret)
-			goto err;
+			return -1;
 
 		debug("SF: AT45 status register: %02x\n", status);
 
 		if (!(status & AT45_STATUS_P2_PAGE_SIZE)) {
-			asf->flash.read = dataflash_read_fast_at45;
-			asf->flash.write = dataflash_write_at45;
-			asf->flash.erase = dataflash_erase_at45;
+			flash->read = dataflash_read_fast_at45;
+			flash->write = dataflash_write_at45;
+			flash->erase = dataflash_erase_at45;
 			page_size += 1 << (params->l2_page_size - 5);
 		} else {
-			asf->flash.read = spi_flash_cmd_read_fast;
-			asf->flash.write = dataflash_write_p2;
-			asf->flash.erase = dataflash_erase_p2;
+			flash->read = spi_flash_cmd_read_fast;
+			flash->write = dataflash_write_p2;
+			flash->erase = dataflash_erase_p2;
 		}
 
-		asf->flash.page_size = page_size;
-		asf->flash.sector_size = page_size;
+		flash->page_size = page_size;
+		flash->sector_size = page_size;
 		break;
 
 	case DF_FAMILY_AT26F:
 	case DF_FAMILY_AT26DF:
-		asf->flash.read = spi_flash_cmd_read_fast;
-		asf->flash.write = spi_flash_cmd_write_multi;
-		asf->flash.erase = spi_flash_cmd_erase;
-		asf->flash.page_size = page_size;
-		asf->flash.sector_size = 4096;
+		flash->read = spi_flash_cmd_read_fast;
+		flash->write = spi_flash_cmd_write_multi;
+		flash->erase = spi_flash_cmd_erase;
+		flash->page_size = page_size;
+		flash->sector_size = 4096;
 		/* clear SPRL# bit for locked flash */
-		spi_flash_cmd_write_status(&asf->flash, 0);
+		spi_flash_cmd_write_status(flash, 0);
 		break;
 
 	default:
 		debug("SF: Unsupported DataFlash family %u\n", family);
-		goto err;
+		return -1;
 	}
 
-	asf->flash.size = page_size * params->pages_per_block
+	flash->size = page_size * params->pages_per_block
 				* params->blocks_per_sector
 				* params->nr_sectors;
 
-	return &asf->flash;
-
-err:
-	free(asf);
-	return NULL;
+	return 1;
 }
--- a/drivers/mtd/spi/eon.c
+++ b/drivers/mtd/spi/eon.c
@@ -29,10 +29,9 @@ static const struct eon_spi_flash_params
 	},
 };
 
-struct spi_flash *spi_flash_probe_eon(struct spi_slave *spi, u8 *idcode)
+int spi_flash_probe_eon(struct spi_flash *flash, u8 *idcode)
 {
 	const struct eon_spi_flash_params *params;
-	struct spi_flash *flash;
 	unsigned int i;
 
 	for (i = 0; i < ARRAY_SIZE(eon_spi_flash_table); ++i) {
@@ -43,16 +42,10 @@ struct spi_flash *spi_flash_probe_eon(st
 
 	if (i == ARRAY_SIZE(eon_spi_flash_table)) {
 		debug("SF: Unsupported EON ID %02x\n", idcode[1]);
-		return NULL;
+		return 0;
 	}
 
-	flash = malloc(sizeof(*flash));
-	if (!flash) {
-		debug("SF: Failed to allocate memory\n");
-		return NULL;
-	}
-
-	flash->spi = spi;
+	flash->priv = (void *)params;
 	flash->name = params->name;
 
 	flash->write = spi_flash_cmd_write_multi;
@@ -63,5 +56,5 @@ struct spi_flash *spi_flash_probe_eon(st
 	flash->size = 256 * 16
 	    * params->nr_sectors;
 
-	return flash;
+	return 1;
 }
--- a/drivers/mtd/spi/macronix.c
+++ b/drivers/mtd/spi/macronix.c
@@ -79,10 +79,9 @@ static const struct macronix_spi_flash_p
 	},
 };
 
-struct spi_flash *spi_flash_probe_macronix(struct spi_slave *spi, u8 *idcode)
+int spi_flash_probe_macronix(struct spi_flash *flash, u8 *idcode)
 {
 	const struct macronix_spi_flash_params *params;
-	struct spi_flash *flash;
 	unsigned int i;
 	u16 id = idcode[2] | idcode[1] << 8;
 
@@ -94,16 +93,10 @@ struct spi_flash *spi_flash_probe_macron
 
 	if (i == ARRAY_SIZE(macronix_spi_flash_table)) {
 		debug("SF: Unsupported Macronix ID %04x\n", id);
-		return NULL;
+		return 0;
 	}
 
-	flash = malloc(sizeof(*flash));
-	if (!flash) {
-		debug("SF: Failed to allocate memory\n");
-		return NULL;
-	}
-
-	flash->spi = spi;
+	flash->priv = (void *)params;
 	flash->name = params->name;
 
 	flash->write = spi_flash_cmd_write_multi;
@@ -116,5 +109,5 @@ struct spi_flash *spi_flash_probe_macron
 	/* Clear BP# bits for read-only flash */
 	spi_flash_cmd_write_status(flash, 0);
 
-	return flash;
+	return 1;
 }
--- a/drivers/mtd/spi/ramtron.c
+++ b/drivers/mtd/spi/ramtron.c
@@ -69,17 +69,6 @@ struct ramtron_spi_fram_params {
 	const char *name;	/* name for display and/or matching */
 };
 
-struct ramtron_spi_fram {
-	struct spi_flash flash;
-	const struct ramtron_spi_fram_params *params;
-};
-
-static inline struct ramtron_spi_fram *to_ramtron_spi_fram(struct spi_flash
-							     *flash)
-{
-	return container_of(flash, struct ramtron_spi_fram, flash);
-}
-
 /*
  * table describing supported FRAM chips:
  * chips without RDID command must have the values 0xff for id1 and id2
@@ -155,18 +144,18 @@ static const struct ramtron_spi_fram_par
 static int ramtron_common(struct spi_flash *flash,
 		u32 offset, size_t len, void *buf, u8 command)
 {
-	struct ramtron_spi_fram *sn = to_ramtron_spi_fram(flash);
+	const struct ramtron_spi_fram_params *params = flash->priv;
 	u8 cmd[4];
 	int cmd_len;
 	int ret;
 
-	if (sn->params->addr_len == 3 && sn->params->merge_cmd == 0) {
+	if (params->addr_len == 3 && params->merge_cmd == 0) {
 		cmd[0] = command;
 		cmd[1] = offset >> 16;
 		cmd[2] = offset >> 8;
 		cmd[3] = offset;
 		cmd_len = 4;
-	} else if (sn->params->addr_len == 2 && sn->params->merge_cmd == 0) {
+	} else if (params->addr_len == 2 && params->merge_cmd == 0) {
 		cmd[0] = command;
 		cmd[1] = offset >> 8;
 		cmd[2] = offset;
@@ -230,10 +219,9 @@ static int ramtron_erase(struct spi_flas
  * nore: we are called here with idcode pointing to the first non-0x7f byte
  * already!
  */
-struct spi_flash *spi_fram_probe_ramtron(struct spi_slave *spi, u8 *idcode)
+int spi_fram_probe_ramtron(struct spi_flash *flash, u8 *idcode)
 {
 	const struct ramtron_spi_fram_params *params;
-	struct ramtron_spi_fram *sn;
 	unsigned int i;
 #ifdef CONFIG_SPI_FRAM_RAMTRON_NON_JEDEC
 	int ret;
@@ -259,11 +247,11 @@ struct spi_flash *spi_fram_probe_ramtron
 		 */
 		ret = spi_flash_cmd(spi, CMD_READ_STATUS, &sr, 1);
 		if (ret)
-			return NULL;
+			return 0;
 
 		/* Bits 5,4,0 are fixed 0 for all devices */
 		if ((sr & 0x31) != 0x00)
-			return NULL;
+			return 0;
 		/* now find the device */
 		for (i = 0; i < ARRAY_SIZE(ramtron_spi_fram_table); i++) {
 			params = &ramtron_spi_fram_table[i];
@@ -281,23 +269,16 @@ struct spi_flash *spi_fram_probe_ramtron
 	/* arriving here means no method has found a device we can handle */
 	debug("SF/ramtron: unsupported device id0=%02x id1=%02x id2=%02x\n",
 		idcode[0], idcode[1], idcode[2]);
-	return NULL;
+	return 0;
 
 found:
-	sn = malloc(sizeof(*sn));
-	if (!sn) {
-		debug("SF: Failed to allocate memory\n");
-		return NULL;
-	}
+	flash->priv = (void *)params;
+	flash->name = params->name;
 
-	sn->params = params;
-	sn->flash.spi = spi;
-	sn->flash.name = params->name;
-
-	sn->flash.write = ramtron_write;
-	sn->flash.read = ramtron_read;
-	sn->flash.erase = ramtron_erase;
-	sn->flash.size = params->size;
+	flash->write = ramtron_write;
+	flash->read = ramtron_read;
+	flash->erase = ramtron_erase;
+	flash->size = params->size;
 
-	return &sn->flash;
+	return 1;
 }
--- a/drivers/mtd/spi/spansion.c
+++ b/drivers/mtd/spi/spansion.c
@@ -105,10 +105,9 @@ static const struct spansion_spi_flash_p
 	},
 };
 
-struct spi_flash *spi_flash_probe_spansion(struct spi_slave *spi, u8 *idcode)
+int spi_flash_probe_spansion(struct spi_flash *flash, u8 *idcode)
 {
 	const struct spansion_spi_flash_params *params;
-	struct spi_flash *flash;
 	unsigned int i;
 	unsigned short jedec, ext_jedec;
 
@@ -125,16 +124,10 @@ struct spi_flash *spi_flash_probe_spansi
 
 	if (i == ARRAY_SIZE(spansion_spi_flash_table)) {
 		debug("SF: Unsupported SPANSION ID %04x %04x\n", jedec, ext_jedec);
-		return NULL;
+		return 0;
 	}
 
-	flash = malloc(sizeof(*flash));
-	if (!flash) {
-		debug("SF: Failed to allocate memory\n");
-		return NULL;
-	}
-
-	flash->spi = spi;
+	flash->priv = (void *)params;
 	flash->name = params->name;
 
 	flash->write = spi_flash_cmd_write_multi;
@@ -144,5 +137,5 @@ struct spi_flash *spi_flash_probe_spansi
 	flash->sector_size = 256 * params->pages_per_sector;
 	flash->size = flash->sector_size * params->nr_sectors;
 
-	return flash;
+	return 1;
 }
--- a/drivers/mtd/spi/spi_flash.c
+++ b/drivers/mtd/spi/spi_flash.c
@@ -296,7 +296,7 @@ int spi_flash_cmd_write_status(struct sp
 static struct {
 	const u8 shift;
 	const u8 idcode;
-	struct spi_flash *(*probe) (struct spi_slave *spi, u8 *idcode);
+	int (*probe) (struct spi_flash *flash, u8 *idcode);
 } flashes[] = {
 	/* Keep it sorted by define name */
 #ifdef CONFIG_SPI_FLASH_ATMEL
@@ -343,7 +343,7 @@ struct spi_flash *spi_flash_probe(unsign
 		unsigned int max_hz, unsigned int spi_mode)
 {
 	struct spi_slave *spi;
-	struct spi_flash *flash = NULL;
+	struct spi_flash *flash;
 	int ret, i, shift;
 	u8 idcode[IDCODE_LEN], *idp;
 #ifdef CONFIG_NEEDS_MANUAL_RELOC
@@ -379,6 +379,15 @@ struct spi_flash *spi_flash_probe(unsign
 	print_buffer(0, idcode, 1, sizeof(idcode), 0);
 #endif
 
+	flash = malloc(sizeof(*flash));
+	if (!flash) {
+		debug("SF: failed to alloc memory\n");
+		goto err_malloc;
+	}
+
+	memset(flash, 0, sizeof(*flash));
+	flash->spi = spi;
+
 	/* count the number of continuation bytes */
 	for (shift = 0, idp = idcode;
 	     shift < IDCODE_CONT_LEN && *idp == 0x7f;
@@ -389,12 +398,12 @@ struct spi_flash *spi_flash_probe(unsign
 	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)
+			ret = flashes[i].probe(flash, idp);
+			if (ret)
 				break;
 		}
 
-	if (!flash) {
+	if (ret <= 0) {
 		printf("SF: Unsupported manufacturer %02x\n", *idp);
 		goto err_manufacturer_probe;
 	}
@@ -408,6 +417,8 @@ struct spi_flash *spi_flash_probe(unsign
 	return flash;
 
 err_manufacturer_probe:
+	free(flash);
+err_malloc:
 err_read_id:
 	spi_release_bus(spi);
 err_claim_bus:
--- a/drivers/mtd/spi/spi_flash_internal.h
+++ b/drivers/mtd/spi/spi_flash_internal.h
@@ -98,11 +98,11 @@ int spi_flash_cmd_wait_ready(struct spi_
 int spi_flash_cmd_erase(struct spi_flash *flash, u32 offset, size_t len);
 
 /* Manufacturer-specific probe functions */
-struct spi_flash *spi_flash_probe_spansion(struct spi_slave *spi, u8 *idcode);
-struct spi_flash *spi_flash_probe_atmel(struct spi_slave *spi, u8 *idcode);
-struct spi_flash *spi_flash_probe_eon(struct spi_slave *spi, u8 *idcode);
-struct spi_flash *spi_flash_probe_macronix(struct spi_slave *spi, u8 *idcode);
-struct spi_flash *spi_flash_probe_sst(struct spi_slave *spi, u8 *idcode);
-struct spi_flash *spi_flash_probe_stmicro(struct spi_slave *spi, u8 *idcode);
-struct spi_flash *spi_flash_probe_winbond(struct spi_slave *spi, u8 *idcode);
-struct spi_flash *spi_fram_probe_ramtron(struct spi_slave *spi, u8 *idcode);
+int spi_flash_probe_spansion(struct spi_flash *flash, u8 *idcode);
+int spi_flash_probe_atmel(struct spi_flash *flash, u8 *idcode);
+int spi_flash_probe_eon(struct spi_flash *flash, u8 *idcode);
+int spi_flash_probe_macronix(struct spi_flash *flash, u8 *idcode);
+int spi_flash_probe_sst(struct spi_flash *flash, u8 *idcode);
+int spi_flash_probe_stmicro(struct spi_flash *flash, u8 *idcode);
+int spi_flash_probe_winbond(struct spi_flash *flash, u8 *idcode);
+int spi_fram_probe_ramtron(struct spi_flash *flash, u8 *idcode);
--- a/drivers/mtd/spi/sst.c
+++ b/drivers/mtd/spi/sst.c
@@ -39,11 +39,6 @@ struct sst_spi_flash_params {
 	const char *name;
 };
 
-struct sst_spi_flash {
-	struct spi_flash flash;
-	const struct sst_spi_flash_params *params;
-};
-
 static const struct sst_spi_flash_params sst_spi_flash_table[] = {
 	{
 		.idcode1 = 0x8d,
@@ -185,11 +180,9 @@ sst_write_wp(struct spi_flash *flash, u3
 	return ret;
 }
 
-struct spi_flash *
-spi_flash_probe_sst(struct spi_slave *spi, u8 *idcode)
+int spi_flash_probe_sst(struct spi_flash *flash, u8 *idcode)
 {
 	const struct sst_spi_flash_params *params;
-	struct sst_spi_flash *stm;
 	size_t i;
 
 	for (i = 0; i < ARRAY_SIZE(sst_spi_flash_table); ++i) {
@@ -200,31 +193,24 @@ spi_flash_probe_sst(struct spi_slave *sp
 
 	if (i == ARRAY_SIZE(sst_spi_flash_table)) {
 		debug("SF: Unsupported SST ID %02x\n", idcode[1]);
-		return NULL;
-	}
-
-	stm = malloc(sizeof(*stm));
-	if (!stm) {
-		debug("SF: Failed to allocate memory\n");
-		return NULL;
+		return 0;
 	}
 
-	stm->params = params;
-	stm->flash.spi = spi;
-	stm->flash.name = params->name;
+	flash->priv = (void *)params;
+	flash->name = params->name;
 
-	if (stm->params->flags & SST_FEAT_WP)
-		stm->flash.write = sst_write_wp;
+	if (params->flags & SST_FEAT_WP)
+		flash->write = sst_write_wp;
 	else
-		stm->flash.write = spi_flash_cmd_write_multi;
-	stm->flash.erase = spi_flash_cmd_erase;
-	stm->flash.read = spi_flash_cmd_read_fast;
-	stm->flash.page_size = 256;
-	stm->flash.sector_size = 4096;
-	stm->flash.size = stm->flash.sector_size * params->nr_sectors;
+		flash->write = spi_flash_cmd_write_multi;
+	flash->erase = spi_flash_cmd_erase;
+	flash->read = spi_flash_cmd_read_fast;
+	flash->page_size = 256;
+	flash->sector_size = 4096;
+	flash->size = flash->sector_size * params->nr_sectors;
 
 	/* Flash powers up read-only, so clear BP# bits */
-	spi_flash_cmd_write_status(&stm->flash, 0);
+	spi_flash_cmd_write_status(flash, 0);
 
-	return &stm->flash;
+	return 1;
 }
--- a/drivers/mtd/spi/stmicro.c
+++ b/drivers/mtd/spi/stmicro.c
@@ -112,10 +112,10 @@ static const struct stmicro_spi_flash_pa
 	},
 };
 
-struct spi_flash *spi_flash_probe_stmicro(struct spi_slave *spi, u8 * idcode)
+int spi_flash_probe_stmicro(struct spi_flash *flash, u8 * idcode)
 {
 	const struct stmicro_spi_flash_params *params;
-	struct spi_flash *flash;
+	struct spi_slave *spi = flash->spi;
 	unsigned int i;
 	u16 id;
 
@@ -123,13 +123,13 @@ struct spi_flash *spi_flash_probe_stmicr
 		i = spi_flash_cmd(spi, CMD_M25PXX_RES,
 				  idcode, 4);
 		if (i)
-			return NULL;
+			return 0;
 		if ((idcode[3] & 0xf0) == 0x10) {
 			idcode[0] = 0x20;
 			idcode[1] = 0x20;
 			idcode[2] = idcode[3] + 1;
 		} else
-			return NULL;
+			return 0;
 	}
 
 	id = ((idcode[1] << 8) | idcode[2]);
@@ -143,16 +143,10 @@ struct spi_flash *spi_flash_probe_stmicr
 
 	if (i == ARRAY_SIZE(stmicro_spi_flash_table)) {
 		debug("SF: Unsupported STMicro ID %04x\n", id);
-		return NULL;
+		return 0;
 	}
 
-	flash = malloc(sizeof(*flash));
-	if (!flash) {
-		debug("SF: Failed to allocate memory\n");
-		return NULL;
-	}
-
-	flash->spi = spi;
+	flash->priv = (void *)params;
 	flash->name = params->name;
 
 	flash->write = spi_flash_cmd_write_multi;
@@ -162,5 +156,5 @@ struct spi_flash *spi_flash_probe_stmicr
 	flash->sector_size = 256 * params->pages_per_sector;
 	flash->size = flash->sector_size * params->nr_sectors;
 
-	return flash;
+	return 1;
 }
--- a/drivers/mtd/spi/winbond.c
+++ b/drivers/mtd/spi/winbond.c
@@ -69,10 +69,9 @@ static const struct winbond_spi_flash_pa
 	},
 };
 
-struct spi_flash *spi_flash_probe_winbond(struct spi_slave *spi, u8 *idcode)
+int spi_flash_probe_winbond(struct spi_flash *flash, u8 *idcode)
 {
 	const struct winbond_spi_flash_params *params;
-	struct spi_flash *flash;
 	unsigned int i;
 
 	for (i = 0; i < ARRAY_SIZE(winbond_spi_flash_table); i++) {
@@ -84,16 +83,10 @@ struct spi_flash *spi_flash_probe_winbon
 	if (i == ARRAY_SIZE(winbond_spi_flash_table)) {
 		debug("SF: Unsupported Winbond ID %02x%02x\n",
 				idcode[1], idcode[2]);
-		return NULL;
+		return 0;
 	}
 
-	flash = malloc(sizeof(*flash));
-	if (!flash) {
-		debug("SF: Failed to allocate memory\n");
-		return NULL;
-	}
-
-	flash->spi = spi;
+	flash->priv = (void *)params;
 	flash->name = params->name;
 
 	flash->write = spi_flash_cmd_write_multi;
@@ -103,5 +96,5 @@ struct spi_flash *spi_flash_probe_winbon
 	flash->sector_size = 4096;
 	flash->size = 4096 * 16 * params->nr_blocks;
 
-	return flash;
+	return 1;
 }
--- a/include/spi_flash.h
+++ b/include/spi_flash.h
@@ -31,6 +31,7 @@ struct spi_flash {
 	struct spi_slave *spi;
 
 	const char	*name;
+	void		*priv;
 
 	/* Total flash size */
 	u32		size;