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-rw-r--r--drivers/mtd/spi-nor/atmel.c211
1 files changed, 211 insertions, 0 deletions
diff --git a/drivers/mtd/spi-nor/atmel.c b/drivers/mtd/spi-nor/atmel.c
new file mode 100644
index 000000000..656dd80a0
--- /dev/null
+++ b/drivers/mtd/spi-nor/atmel.c
@@ -0,0 +1,211 @@
+// 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"
+
+#define ATMEL_SR_GLOBAL_PROTECT_MASK GENMASK(5, 2)
+
+/*
+ * The Atmel AT25FS010/AT25FS040 parts have some weird configuration for the
+ * block protection bits. We don't support them. But legacy behavior in linux
+ * is to unlock the whole flash array on startup. Therefore, we have to support
+ * exactly this operation.
+ */
+static int at25fs_nor_lock(struct spi_nor *nor, loff_t ofs, uint64_t len)
+{
+ return -EOPNOTSUPP;
+}
+
+static int at25fs_nor_unlock(struct spi_nor *nor, loff_t ofs, uint64_t len)
+{
+ int ret;
+
+ /* We only support unlocking the whole flash array */
+ if (ofs || len != nor->params->size)
+ return -EINVAL;
+
+ /* Write 0x00 to the status register to disable write protection */
+ ret = spi_nor_write_sr_and_check(nor, 0);
+ if (ret)
+ dev_dbg(nor->dev, "unable to clear BP bits, WP# asserted?\n");
+
+ return ret;
+}
+
+static int at25fs_nor_is_locked(struct spi_nor *nor, loff_t ofs, uint64_t len)
+{
+ return -EOPNOTSUPP;
+}
+
+static const struct spi_nor_locking_ops at25fs_nor_locking_ops = {
+ .lock = at25fs_nor_lock,
+ .unlock = at25fs_nor_unlock,
+ .is_locked = at25fs_nor_is_locked,
+};
+
+static void at25fs_nor_late_init(struct spi_nor *nor)
+{
+ nor->params->locking_ops = &at25fs_nor_locking_ops;
+}
+
+static const struct spi_nor_fixups at25fs_nor_fixups = {
+ .late_init = at25fs_nor_late_init,
+};
+
+/**
+ * atmel_nor_set_global_protection - Do a Global Protect or Unprotect command
+ * @nor: pointer to 'struct spi_nor'
+ * @ofs: offset in bytes
+ * @len: len in bytes
+ * @is_protect: if true do a Global Protect otherwise it is a Global Unprotect
+ *
+ * Return: 0 on success, -error otherwise.
+ */
+static int atmel_nor_set_global_protection(struct spi_nor *nor, loff_t ofs,
+ uint64_t len, bool is_protect)
+{
+ int ret;
+ u8 sr;
+
+ /* We only support locking the whole flash array */
+ if (ofs || len != nor->params->size)
+ return -EINVAL;
+
+ ret = spi_nor_read_sr(nor, nor->bouncebuf);
+ if (ret)
+ return ret;
+
+ sr = nor->bouncebuf[0];
+
+ /* SRWD bit needs to be cleared, otherwise the protection doesn't change */
+ if (sr & SR_SRWD) {
+ sr &= ~SR_SRWD;
+ ret = spi_nor_write_sr_and_check(nor, sr);
+ if (ret) {
+ dev_dbg(nor->dev, "unable to clear SRWD bit, WP# asserted?\n");
+ return ret;
+ }
+ }
+
+ if (is_protect) {
+ sr |= ATMEL_SR_GLOBAL_PROTECT_MASK;
+ /*
+ * Set the SRWD bit again as soon as we are protecting
+ * anything. This will ensure that the WP# pin is working
+ * correctly. By doing this we also behave the same as
+ * spi_nor_sr_lock(), which sets SRWD if any block protection
+ * is active.
+ */
+ sr |= SR_SRWD;
+ } else {
+ sr &= ~ATMEL_SR_GLOBAL_PROTECT_MASK;
+ }
+
+ nor->bouncebuf[0] = sr;
+
+ /*
+ * We cannot use the spi_nor_write_sr_and_check() because this command
+ * isn't really setting any bits, instead it is an pseudo command for
+ * "Global Unprotect" or "Global Protect"
+ */
+ return spi_nor_write_sr(nor, nor->bouncebuf, 1);
+}
+
+static int atmel_nor_global_protect(struct spi_nor *nor, loff_t ofs,
+ uint64_t len)
+{
+ return atmel_nor_set_global_protection(nor, ofs, len, true);
+}
+
+static int atmel_nor_global_unprotect(struct spi_nor *nor, loff_t ofs,
+ uint64_t len)
+{
+ return atmel_nor_set_global_protection(nor, ofs, len, false);
+}
+
+static int atmel_nor_is_global_protected(struct spi_nor *nor, loff_t ofs,
+ uint64_t len)
+{
+ int ret;
+
+ if (ofs >= nor->params->size || (ofs + len) > nor->params->size)
+ return -EINVAL;
+
+ ret = spi_nor_read_sr(nor, nor->bouncebuf);
+ if (ret)
+ return ret;
+
+ return ((nor->bouncebuf[0] & ATMEL_SR_GLOBAL_PROTECT_MASK) == ATMEL_SR_GLOBAL_PROTECT_MASK);
+}
+
+static const struct spi_nor_locking_ops atmel_nor_global_protection_ops = {
+ .lock = atmel_nor_global_protect,
+ .unlock = atmel_nor_global_unprotect,
+ .is_locked = atmel_nor_is_global_protected,
+};
+
+static void atmel_nor_global_protection_late_init(struct spi_nor *nor)
+{
+ nor->params->locking_ops = &atmel_nor_global_protection_ops;
+}
+
+static const struct spi_nor_fixups atmel_nor_global_protection_fixups = {
+ .late_init = atmel_nor_global_protection_late_init,
+};
+
+static const struct flash_info atmel_nor_parts[] = {
+ /* Atmel -- some are (confusingly) marketed as "DataFlash" */
+ { "at25fs010", INFO(0x1f6601, 0, 32 * 1024, 4)
+ FLAGS(SPI_NOR_HAS_LOCK)
+ NO_SFDP_FLAGS(SECT_4K)
+ .fixups = &at25fs_nor_fixups },
+ { "at25fs040", INFO(0x1f6604, 0, 64 * 1024, 8)
+ FLAGS(SPI_NOR_HAS_LOCK)
+ NO_SFDP_FLAGS(SECT_4K)
+ .fixups = &at25fs_nor_fixups },
+ { "at25df041a", INFO(0x1f4401, 0, 64 * 1024, 8)
+ FLAGS(SPI_NOR_HAS_LOCK | SPI_NOR_SWP_IS_VOLATILE)
+ NO_SFDP_FLAGS(SECT_4K)
+ .fixups = &atmel_nor_global_protection_fixups },
+ { "at25df321", INFO(0x1f4700, 0, 64 * 1024, 64)
+ FLAGS(SPI_NOR_HAS_LOCK | SPI_NOR_SWP_IS_VOLATILE)
+ NO_SFDP_FLAGS(SECT_4K)
+ .fixups = &atmel_nor_global_protection_fixups },
+ { "at25df321a", INFO(0x1f4701, 0, 64 * 1024, 64)
+ FLAGS(SPI_NOR_HAS_LOCK | SPI_NOR_SWP_IS_VOLATILE)
+ NO_SFDP_FLAGS(SECT_4K)
+ .fixups = &atmel_nor_global_protection_fixups },
+ { "at25df641", INFO(0x1f4800, 0, 64 * 1024, 128)
+ FLAGS(SPI_NOR_HAS_LOCK | SPI_NOR_SWP_IS_VOLATILE)
+ NO_SFDP_FLAGS(SECT_4K)
+ .fixups = &atmel_nor_global_protection_fixups },
+ { "at25sl321", INFO(0x1f4216, 0, 64 * 1024, 64)
+ NO_SFDP_FLAGS(SECT_4K | SPI_NOR_DUAL_READ | SPI_NOR_QUAD_READ) },
+ { "at26f004", INFO(0x1f0400, 0, 64 * 1024, 8)
+ NO_SFDP_FLAGS(SECT_4K) },
+ { "at26df081a", INFO(0x1f4501, 0, 64 * 1024, 16)
+ FLAGS(SPI_NOR_HAS_LOCK | SPI_NOR_SWP_IS_VOLATILE)
+ NO_SFDP_FLAGS(SECT_4K)
+ .fixups = &atmel_nor_global_protection_fixups },
+ { "at26df161a", INFO(0x1f4601, 0, 64 * 1024, 32)
+ FLAGS(SPI_NOR_HAS_LOCK | SPI_NOR_SWP_IS_VOLATILE)
+ NO_SFDP_FLAGS(SECT_4K)
+ .fixups = &atmel_nor_global_protection_fixups },
+ { "at26df321", INFO(0x1f4700, 0, 64 * 1024, 64)
+ FLAGS(SPI_NOR_HAS_LOCK | SPI_NOR_SWP_IS_VOLATILE)
+ NO_SFDP_FLAGS(SECT_4K)
+ .fixups = &atmel_nor_global_protection_fixups },
+ { "at45db081d", INFO(0x1f2500, 0, 64 * 1024, 16)
+ NO_SFDP_FLAGS(SECT_4K) },
+};
+
+const struct spi_nor_manufacturer spi_nor_atmel = {
+ .name = "atmel",
+ .parts = atmel_nor_parts,
+ .nparts = ARRAY_SIZE(atmel_nor_parts),
+};