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path: root/drivers/mtd/spi-nor/sst.c
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Diffstat (limited to 'drivers/mtd/spi-nor/sst.c')
-rw-r--r--drivers/mtd/spi-nor/sst.c151
1 files changed, 151 insertions, 0 deletions
diff --git a/drivers/mtd/spi-nor/sst.c b/drivers/mtd/spi-nor/sst.c
new file mode 100644
index 000000000000..e0af6d25d573
--- /dev/null
+++ b/drivers/mtd/spi-nor/sst.c
@@ -0,0 +1,151 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Copyright (C) 2005, Intec Automation Inc.
+ * Copyright (C) 2014, Freescale Semiconductor, Inc.
+ */
+
+#include <linux/mtd/spi-nor.h>
+
+#include "core.h"
+
+static const struct flash_info sst_parts[] = {
+ /* SST -- large erase sizes are "overlays", "sectors" are 4K */
+ { "sst25vf040b", INFO(0xbf258d, 0, 64 * 1024, 8,
+ SECT_4K | SST_WRITE) },
+ { "sst25vf080b", INFO(0xbf258e, 0, 64 * 1024, 16,
+ SECT_4K | SST_WRITE) },
+ { "sst25vf016b", INFO(0xbf2541, 0, 64 * 1024, 32,
+ SECT_4K | SST_WRITE) },
+ { "sst25vf032b", INFO(0xbf254a, 0, 64 * 1024, 64,
+ SECT_4K | SST_WRITE) },
+ { "sst25vf064c", INFO(0xbf254b, 0, 64 * 1024, 128, SECT_4K) },
+ { "sst25wf512", INFO(0xbf2501, 0, 64 * 1024, 1,
+ SECT_4K | SST_WRITE) },
+ { "sst25wf010", INFO(0xbf2502, 0, 64 * 1024, 2,
+ SECT_4K | SST_WRITE) },
+ { "sst25wf020", INFO(0xbf2503, 0, 64 * 1024, 4,
+ SECT_4K | SST_WRITE) },
+ { "sst25wf020a", INFO(0x621612, 0, 64 * 1024, 4, SECT_4K) },
+ { "sst25wf040b", INFO(0x621613, 0, 64 * 1024, 8, SECT_4K) },
+ { "sst25wf040", INFO(0xbf2504, 0, 64 * 1024, 8,
+ SECT_4K | SST_WRITE) },
+ { "sst25wf080", INFO(0xbf2505, 0, 64 * 1024, 16,
+ SECT_4K | SST_WRITE) },
+ { "sst26wf016b", INFO(0xbf2651, 0, 64 * 1024, 32,
+ SECT_4K | SPI_NOR_DUAL_READ |
+ SPI_NOR_QUAD_READ) },
+ { "sst26vf016b", INFO(0xbf2641, 0, 64 * 1024, 32,
+ SECT_4K | SPI_NOR_DUAL_READ) },
+ { "sst26vf064b", INFO(0xbf2643, 0, 64 * 1024, 128,
+ SECT_4K | SPI_NOR_DUAL_READ |
+ SPI_NOR_QUAD_READ) },
+};
+
+static int sst_write(struct mtd_info *mtd, loff_t to, size_t len,
+ size_t *retlen, const u_char *buf)
+{
+ struct spi_nor *nor = mtd_to_spi_nor(mtd);
+ size_t actual = 0;
+ int ret;
+
+ dev_dbg(nor->dev, "to 0x%08x, len %zd\n", (u32)to, len);
+
+ ret = spi_nor_lock_and_prep(nor);
+ if (ret)
+ return ret;
+
+ ret = spi_nor_write_enable(nor);
+ if (ret)
+ goto out;
+
+ nor->sst_write_second = false;
+
+ /* Start write from odd address. */
+ if (to % 2) {
+ nor->program_opcode = SPINOR_OP_BP;
+
+ /* write one byte. */
+ ret = spi_nor_write_data(nor, to, 1, buf);
+ if (ret < 0)
+ goto out;
+ WARN(ret != 1, "While writing 1 byte written %i bytes\n", ret);
+ ret = spi_nor_wait_till_ready(nor);
+ if (ret)
+ goto out;
+
+ to++;
+ actual++;
+ }
+
+ /* Write out most of the data here. */
+ for (; actual < len - 1; actual += 2) {
+ nor->program_opcode = SPINOR_OP_AAI_WP;
+
+ /* write two bytes. */
+ ret = spi_nor_write_data(nor, to, 2, buf + actual);
+ if (ret < 0)
+ goto out;
+ WARN(ret != 2, "While writing 2 bytes written %i bytes\n", ret);
+ ret = spi_nor_wait_till_ready(nor);
+ if (ret)
+ goto out;
+ to += 2;
+ nor->sst_write_second = true;
+ }
+ nor->sst_write_second = false;
+
+ ret = spi_nor_write_disable(nor);
+ if (ret)
+ goto out;
+
+ ret = spi_nor_wait_till_ready(nor);
+ if (ret)
+ goto out;
+
+ /* Write out trailing byte if it exists. */
+ if (actual != len) {
+ ret = spi_nor_write_enable(nor);
+ if (ret)
+ goto out;
+
+ nor->program_opcode = SPINOR_OP_BP;
+ ret = spi_nor_write_data(nor, to, 1, buf + actual);
+ if (ret < 0)
+ goto out;
+ WARN(ret != 1, "While writing 1 byte written %i bytes\n", ret);
+ ret = spi_nor_wait_till_ready(nor);
+ if (ret)
+ goto out;
+
+ actual += 1;
+
+ ret = spi_nor_write_disable(nor);
+ }
+out:
+ *retlen += actual;
+ spi_nor_unlock_and_unprep(nor);
+ return ret;
+}
+
+static void sst_default_init(struct spi_nor *nor)
+{
+ nor->flags |= SNOR_F_HAS_LOCK;
+}
+
+static void sst_post_sfdp_fixups(struct spi_nor *nor)
+{
+ if (nor->info->flags & SST_WRITE)
+ nor->mtd._write = sst_write;
+}
+
+static const struct spi_nor_fixups sst_fixups = {
+ .default_init = sst_default_init,
+ .post_sfdp = sst_post_sfdp_fixups,
+};
+
+const struct spi_nor_manufacturer spi_nor_sst = {
+ .name = "sst",
+ .parts = sst_parts,
+ .nparts = ARRAY_SIZE(sst_parts),
+ .fixups = &sst_fixups,
+};