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authorHaavard Skinnemoen <haavard.skinnemoen@atmel.com>2008-05-16 11:10:33 +0200
committerWolfgang Denk <wd@denx.de>2008-06-03 20:31:34 +0200
commitd25ce7d24cc0f93881559f4009175ea305af65e8 (patch)
tree5f06370563f9a19fa0d0d266035d136e7688b487 /drivers/mtd/spi/spi_flash.c
parent60445cb5c3eb77ed1a07f2d908eef09174483698 (diff)
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SPI Flash subsystem
This adds a new SPI flash subsystem. Currently, only AT45 DataFlash in non-power-of-two mode is supported, but some preliminary support for other flash types is in place as well. Signed-off-by: Haavard Skinnemoen <haavard.skinnemoen@atmel.com>
Diffstat (limited to 'drivers/mtd/spi/spi_flash.c')
-rw-r--r--drivers/mtd/spi/spi_flash.c162
1 files changed, 162 insertions, 0 deletions
diff --git a/drivers/mtd/spi/spi_flash.c b/drivers/mtd/spi/spi_flash.c
new file mode 100644
index 0000000..d581cb3
--- /dev/null
+++ b/drivers/mtd/spi/spi_flash.c
@@ -0,0 +1,162 @@
+/*
+ * SPI flash interface
+ *
+ * Copyright (C) 2008 Atmel Corporation
+ */
+#define DEBUG
+#include <common.h>
+#include <malloc.h>
+#include <spi.h>
+#include <spi_flash.h>
+
+#include "spi_flash_internal.h"
+
+int spi_flash_cmd(struct spi_slave *spi, u8 cmd, void *response, size_t len)
+{
+ unsigned long flags = SPI_XFER_BEGIN;
+ int ret;
+
+ if (len == 0)
+ flags |= SPI_XFER_END;
+
+ ret = spi_xfer(spi, 8, &cmd, NULL, flags);
+ if (ret) {
+ debug("SF: Failed to send command %02x: %d\n", cmd, ret);
+ return ret;
+ }
+
+ if (len) {
+ ret = spi_xfer(spi, len * 8, NULL, response, SPI_XFER_END);
+ if (ret)
+ debug("SF: Failed to read response (%zu bytes): %d\n",
+ len, ret);
+ }
+
+ return ret;
+}
+
+int spi_flash_cmd_read(struct spi_slave *spi, const u8 *cmd,
+ size_t cmd_len, void *data, size_t data_len)
+{
+ unsigned long flags = SPI_XFER_BEGIN;
+ int ret;
+
+ if (data_len == 0)
+ flags |= SPI_XFER_END;
+
+ ret = spi_xfer(spi, cmd_len * 8, cmd, NULL, flags);
+ if (ret) {
+ debug("SF: Failed to send read command (%zu bytes): %d\n",
+ cmd_len, ret);
+ } else if (data_len != 0) {
+ ret = spi_xfer(spi, data_len * 8, NULL, data, SPI_XFER_END);
+ if (ret)
+ debug("SF: Failed to read %zu bytes of data: %d\n",
+ data_len, ret);
+ }
+
+ return ret;
+}
+
+int spi_flash_cmd_write(struct spi_slave *spi, const u8 *cmd, size_t cmd_len,
+ const void *data, size_t data_len)
+{
+ unsigned long flags = SPI_XFER_BEGIN;
+ int ret;
+
+ if (data_len == 0)
+ flags |= SPI_XFER_END;
+
+ ret = spi_xfer(spi, cmd_len * 8, cmd, NULL, flags);
+ if (ret) {
+ debug("SF: Failed to send read command (%zu bytes): %d\n",
+ cmd_len, ret);
+ } else if (data_len != 0) {
+ ret = spi_xfer(spi, data_len * 8, data, NULL, SPI_XFER_END);
+ if (ret)
+ debug("SF: Failed to read %zu bytes of data: %d\n",
+ data_len, ret);
+ }
+
+ return ret;
+}
+
+
+int spi_flash_read_common(struct spi_flash *flash, const u8 *cmd,
+ size_t cmd_len, void *data, size_t data_len)
+{
+ struct spi_slave *spi = flash->spi;
+ int ret;
+
+ spi_claim_bus(spi);
+ ret = spi_flash_cmd_read(spi, cmd, cmd_len, data, data_len);
+ spi_release_bus(spi);
+
+ return ret;
+}
+
+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[3];
+
+ spi = spi_setup_slave(bus, cs, max_hz, spi_mode);
+ if (!spi) {
+ debug("SF: Failed to set up slave\n");
+ return NULL;
+ }
+
+ ret = spi_claim_bus(spi);
+ if (ret) {
+ debug("SF: Failed to claim SPI bus: %d\n", ret);
+ goto err_claim_bus;
+ }
+
+ /* Read the ID codes */
+ ret = spi_flash_cmd(spi, CMD_READ_ID, &idcode, sizeof(idcode));
+ if (ret)
+ goto err_read_id;
+
+ debug("SF: Got idcode %02x %02x %02x\n", idcode[0],
+ idcode[1], idcode[2]);
+
+ switch (idcode[0]) {
+#ifdef CONFIG_SPI_FLASH_SPANSION
+ case 0x01:
+ flash = spi_flash_probe_spansion(spi, idcode);
+ break;
+#endif
+#ifdef CONFIG_SPI_FLASH_ATMEL
+ case 0x1F:
+ flash = spi_flash_probe_atmel(spi, idcode);
+ break;
+#endif
+ default:
+ debug("SF: Unsupported manufacturer %02X\n", idcode[0]);
+ flash = NULL;
+ break;
+ }
+
+ if (!flash)
+ goto err_manufacturer_probe;
+
+ spi_release_bus(spi);
+
+ return flash;
+
+err_manufacturer_probe:
+err_read_id:
+ spi_release_bus(spi);
+err_claim_bus:
+ spi_free_slave(spi);
+ return NULL;
+}
+
+void spi_flash_free(struct spi_flash *flash)
+{
+ spi_free_slave(flash->spi);
+ free(flash);
+}