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-rw-r--r--src/drivers/spi/sst.c268
1 files changed, 268 insertions, 0 deletions
diff --git a/src/drivers/spi/sst.c b/src/drivers/spi/sst.c
new file mode 100644
index 0000000000..56cc851acf
--- /dev/null
+++ b/src/drivers/spi/sst.c
@@ -0,0 +1,268 @@
+/*
+ * Driver for SST serial flashes
+ *
+ * (C) Copyright 2000-2002
+ * Wolfgang Denk, DENX Software Engineering, wd@denx.de.
+ * Copyright 2008, Network Appliance Inc.
+ * Jason McMullan <mcmullan@netapp.com>
+ * Copyright (C) 2004-2007 Freescale Semiconductor, Inc.
+ * TsiChung Liew (Tsi-Chung.Liew@freescale.com)
+ * Copyright (c) 2008-2009 Analog Devices Inc.
+ *
+ * Licensed under the GPL-2 or later.
+ */
+
+#include <stdlib.h>
+#include <spi_flash.h>
+#include "spi_flash_internal.h"
+
+#define CMD_SST_WREN 0x06 /* Write Enable */
+#define CMD_SST_WRDI 0x04 /* Write Disable */
+#define CMD_SST_RDSR 0x05 /* Read Status Register */
+#define CMD_SST_WRSR 0x01 /* Write Status Register */
+#define CMD_SST_READ 0x03 /* Read Data Bytes */
+#define CMD_SST_FAST_READ 0x0b /* Read Data Bytes at Higher Speed */
+#define CMD_SST_BP 0x02 /* Byte Program */
+#define CMD_SST_AAI_WP 0xAD /* Auto Address Increment Word Program */
+#define CMD_SST_SE 0x20 /* Sector Erase */
+
+#define SST_SR_WIP (1 << 0) /* Write-in-Progress */
+#define SST_SR_WEL (1 << 1) /* Write enable */
+#define SST_SR_BP0 (1 << 2) /* Block Protection 0 */
+#define SST_SR_BP1 (1 << 3) /* Block Protection 1 */
+#define SST_SR_BP2 (1 << 4) /* Block Protection 2 */
+#define SST_SR_AAI (1 << 6) /* Addressing mode */
+#define SST_SR_BPL (1 << 7) /* BP bits lock */
+
+struct sst_spi_flash_params {
+ u8 idcode1;
+ u16 nr_sectors;
+ const char *name;
+};
+
+struct sst_spi_flash {
+ struct spi_flash flash;
+ const struct sst_spi_flash_params *params;
+};
+
+static inline struct sst_spi_flash *to_sst_spi_flash(struct spi_flash *flash)
+{
+ return container_of(flash, struct sst_spi_flash, flash);
+}
+
+#define SST_SECTOR_SIZE (4 * 1024)
+static const struct sst_spi_flash_params sst_spi_flash_table[] = {
+ {
+ .idcode1 = 0x8d,
+ .nr_sectors = 128,
+ .name = "SST25VF040B",
+ },{
+ .idcode1 = 0x8e,
+ .nr_sectors = 256,
+ .name = "SST25VF080B",
+ },{
+ .idcode1 = 0x41,
+ .nr_sectors = 512,
+ .name = "SST25VF016B",
+ },{
+ .idcode1 = 0x4a,
+ .nr_sectors = 1024,
+ .name = "SST25VF032B",
+ },{
+ .idcode1 = 0x4b,
+ .nr_sectors = 2048,
+ .name = "SST25VF064C",
+ },{
+ .idcode1 = 0x01,
+ .nr_sectors = 16,
+ .name = "SST25WF512",
+ },{
+ .idcode1 = 0x02,
+ .nr_sectors = 32,
+ .name = "SST25WF010",
+ },{
+ .idcode1 = 0x03,
+ .nr_sectors = 64,
+ .name = "SST25WF020",
+ },{
+ .idcode1 = 0x04,
+ .nr_sectors = 128,
+ .name = "SST25WF040",
+ },
+};
+
+static int
+sst_enable_writing(struct spi_flash *flash)
+{
+ int ret = spi_flash_cmd(flash->spi, CMD_SST_WREN, NULL, 0);
+ if (ret)
+ printk(BIOS_WARNING, "SF: Enabling Write failed\n");
+ return ret;
+}
+
+static int
+sst_disable_writing(struct spi_flash *flash)
+{
+ int ret = spi_flash_cmd(flash->spi, CMD_SST_WRDI, NULL, 0);
+ if (ret)
+ printk(BIOS_WARNING, "SF: Disabling Write failed\n");
+ return ret;
+}
+
+static int
+sst_byte_write(struct spi_flash *flash, u32 offset, const void *buf)
+{
+ int ret;
+ u8 cmd[4] = {
+ CMD_SST_BP,
+ offset >> 16,
+ offset >> 8,
+ offset,
+ };
+
+ printk(BIOS_SPEW, "BP[%02x]: 0x%p => cmd = { 0x%02x 0x%06x }\n",
+ spi_w8r8(flash->spi, CMD_SST_RDSR), buf, cmd[0], offset);
+
+ ret = sst_enable_writing(flash);
+ if (ret)
+ return ret;
+
+ ret = spi_flash_cmd_write(flash->spi, cmd, sizeof(cmd), buf, 1);
+ if (ret)
+ return ret;
+
+ return spi_flash_cmd_wait_ready(flash, SPI_FLASH_PROG_TIMEOUT);
+}
+
+static int
+sst_write(struct spi_flash *flash, u32 offset, size_t len, const void *buf)
+{
+ size_t actual, cmd_len;
+ int ret;
+ u8 cmd[4];
+
+ ret = spi_claim_bus(flash->spi);
+ if (ret) {
+ printk(BIOS_WARNING, "SF: Unable to claim SPI bus\n");
+ return ret;
+ }
+
+ /* If the data is not word aligned, write out leading single byte */
+ actual = offset % 2;
+ if (actual) {
+ ret = sst_byte_write(flash, offset, buf);
+ if (ret)
+ goto done;
+ }
+ offset += actual;
+
+ ret = sst_enable_writing(flash);
+ if (ret)
+ goto done;
+
+ cmd_len = 4;
+ cmd[0] = CMD_SST_AAI_WP;
+ cmd[1] = offset >> 16;
+ cmd[2] = offset >> 8;
+ cmd[3] = offset;
+
+ for (; actual < len - 1; actual += 2) {
+ printk(BIOS_SPEW, "WP[%02x]: 0x%p => cmd = { 0x%02x 0x%06x }\n",
+ spi_w8r8(flash->spi, CMD_SST_RDSR), buf + actual, cmd[0],
+ offset);
+
+ ret = spi_flash_cmd_write(flash->spi, cmd, cmd_len,
+ buf + actual, 2);
+ if (ret) {
+ printk(BIOS_WARNING, "SF: SST word program failed\n");
+ break;
+ }
+
+ ret = spi_flash_cmd_wait_ready(flash, SPI_FLASH_PROG_TIMEOUT);
+ if (ret)
+ break;
+
+ cmd_len = 1;
+ offset += 2;
+ }
+
+ if (!ret)
+ ret = sst_disable_writing(flash);
+
+ /* If there is a single trailing byte, write it out */
+ if (!ret && actual != len)
+ ret = sst_byte_write(flash, offset, buf + actual);
+
+ done:
+ printk(BIOS_INFO, "SF: SST: program %s %zu bytes @ 0x%lx\n",
+ ret ? "failure" : "success", len, offset - actual);
+
+ spi_release_bus(flash->spi);
+ return ret;
+}
+
+static int sst_erase(struct spi_flash *flash, u32 offset, size_t len)
+{
+ return spi_flash_cmd_erase(flash, CMD_SST_SE, offset, len);
+}
+
+static int
+sst_unlock(struct spi_flash *flash)
+{
+ int ret;
+ u8 cmd, status;
+
+ ret = sst_enable_writing(flash);
+ if (ret)
+ return ret;
+
+ cmd = CMD_SST_WRSR;
+ status = 0;
+ ret = spi_flash_cmd_write(flash->spi, &cmd, 1, &status, 1);
+ if (ret)
+ printk(BIOS_WARNING, "SF: Unable to set status byte\n");
+
+ printk(BIOS_INFO, "SF: SST: status = %x\n", spi_w8r8(flash->spi, CMD_SST_RDSR));
+
+ return ret;
+}
+
+struct spi_flash *
+spi_flash_probe_sst(struct spi_slave *spi, 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) {
+ params = &sst_spi_flash_table[i];
+ if (params->idcode1 == idcode[2])
+ break;
+ }
+
+ if (i == ARRAY_SIZE(sst_spi_flash_table)) {
+ printk(BIOS_WARNING, "SF: Unsupported SST ID %02x\n", idcode[1]);
+ return NULL;
+ }
+
+ stm = malloc(sizeof(*stm));
+ if (!stm) {
+ printk(BIOS_WARNING, "SF: Failed to allocate memory\n");
+ return NULL;
+ }
+
+ stm->params = params;
+ stm->flash.spi = spi;
+ stm->flash.name = params->name;
+
+ stm->flash.write = sst_write;
+ stm->flash.erase = sst_erase;
+ stm->flash.read = spi_flash_cmd_read_fast;
+ stm->flash.sector_size = SST_SECTOR_SIZE;
+ stm->flash.size = stm->flash.sector_size * params->nr_sectors;
+
+ /* Flash powers up read-only, so clear BP# bits */
+ sst_unlock(&stm->flash);
+
+ return &stm->flash;
+}
generated by cgit v1.2.3 (git 2.25.1) at 2024-11-10 20:23:51 +0000