Adding upstream version 6.6.15.upstream/6.6.15

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 215 insertions, 0 deletions

diff --git a/drivers/mtd/spi-nor/atmel.c b/drivers/mtd/spi-nor/atmel.c
new file mode 100644
index 0000000000..58968c1e7d
--- /dev/null
+++ b/drivers/mtd/spi-nor/atmel.c
@@ -0,0 +1,215 @@
+// 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 int at25fs_nor_late_init(struct spi_nor *nor)
+{
+	nor->params->locking_ops = &at25fs_nor_locking_ops;
+
+	return 0;
+}
+
+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 int atmel_nor_global_protection_late_init(struct spi_nor *nor)
+{
+	nor->params->locking_ops = &atmel_nor_global_protection_ops;
+
+	return 0;
+}
+
+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),
+};