[15/15] mtd: spi-nor-core: Add support for Cypress Semper flash
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Message ID 20200226125606.22684-16-p.yadav@ti.com
State Superseded
Delegated to: Jagannadha Sutradharudu Teki
Headers show
Series
  • mtd: spi-nor-core: add xSPI Octal DTR support
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Commit Message

Pratyush Yadav Feb. 26, 2020, 12:56 p.m. UTC
The Cypress Semper flash is an xSPI compliant octal DTR flash. Add
support for using it in octal DTR mode.

The flash by default boots in a hybrid sector mode. Switch to uniform
sector mode on boot. Use the default 20 dummy cycles for a read fast
command.

The SFDP programming on some older versions of the flash was incorrect.
Fixes for that are included in the fixup hooks.

Signed-off-by: Pratyush Yadav <p.yadav@ti.com>
---
 drivers/mtd/spi/sf_internal.h  |   4 +
 drivers/mtd/spi/spi-nor-core.c | 188 +++++++++++++++++++++++++++++++++
 drivers/mtd/spi/spi-nor-ids.c  |   1 +
 include/linux/mtd/spi-nor.h    |  14 +++
 4 files changed, 207 insertions(+)

Patch
diff mbox series

diff --git a/drivers/mtd/spi/sf_internal.h b/drivers/mtd/spi/sf_internal.h
index 5780c81287..c59738874d 100644
--- a/drivers/mtd/spi/sf_internal.h
+++ b/drivers/mtd/spi/sf_internal.h
@@ -75,6 +75,10 @@  struct flash_info {
 
 extern const struct flash_info spi_nor_ids[];
 
+#ifdef CONFIG_SPI_FLASH_SPANSION
+extern struct spi_nor_fixups s28hs512t_fixups;
+#endif
+
 #define JEDEC_MFR(info)	((info)->id[0])
 #define JEDEC_ID(info)		(((info)->id[1]) << 8 | ((info)->id[2]))
 
diff --git a/drivers/mtd/spi/spi-nor-core.c b/drivers/mtd/spi/spi-nor-core.c
index d9b381fe36..269fd58ccc 100644
--- a/drivers/mtd/spi/spi-nor-core.c
+++ b/drivers/mtd/spi/spi-nor-core.c
@@ -2597,6 +2597,194 @@  static int spi_nor_setup(struct spi_nor *nor, const struct flash_info *info,
 	return nor->setup(nor, info, params, hwcaps);
 }
 
+#ifdef CONFIG_SPI_FLASH_SPANSION
+/**
+ * spi_nor_cypress_octal_enable() - Enable octal DTR mode on Cypress flashes.
+ * @nor:		pointer to a 'struct spi_nor'
+ *
+ * This also sets the memory access latency cycles to 20, which is the default
+ * in the spi-nor framework.
+ *
+ * Return: 0 on success, -errno otherwise.
+ */
+static int spi_nor_cypress_octal_enable(struct spi_nor *nor)
+{
+	struct spi_mem_op op;
+	u8 buf;
+	u8 addr_width = 3;
+	int ret;
+
+	/* Use 20 dummy cycles for memory array reads. */
+	ret = write_enable(nor);
+	if (ret)
+		return ret;
+
+	buf = SPINOR_REG_CYPRESS_CFR2V_MEMLAT_8_20;
+	op = (struct spi_mem_op)SPI_MEM_OP(SPI_MEM_OP_CMD(SPINOR_OP_WR_ANY_REG, 1),
+			SPI_MEM_OP_ADDR(addr_width, SPINOR_REG_CYPRESS_CFR2V, 1),
+			SPI_MEM_OP_NO_DUMMY,
+			SPI_MEM_OP_DATA_OUT(1, &buf, 1));
+	ret = spi_mem_exec_op(nor->spi, &op);
+	if (ret) {
+		dev_warn(nor->dev,
+			 "failed to set default memory latency value: %d\n",
+			 ret);
+		return ret;
+	}
+	ret = spi_nor_wait_till_ready(nor);
+	if (ret)
+		return ret;
+
+	nor->read_dummy = 20;
+
+	/* Set the octal and DTR enable bits. */
+	ret = write_enable(nor);
+	if (ret)
+		return ret;
+
+	buf = SPINOR_REG_CYPRESS_CFR5V_OCT_DTR_EN;
+	op = (struct spi_mem_op)SPI_MEM_OP(SPI_MEM_OP_CMD(SPINOR_OP_WR_ANY_REG, 1),
+			SPI_MEM_OP_ADDR(addr_width, SPINOR_REG_CYPRESS_CFR5V, 1),
+			SPI_MEM_OP_NO_DUMMY,
+			SPI_MEM_OP_DATA_OUT(1, &buf, 1));
+	ret = spi_mem_exec_op(nor->spi, &op);
+	if (ret) {
+		dev_warn(nor->dev, "Failed to enable octal DTR mode\n");
+		return ret;
+	}
+
+	return 0;
+}
+
+static int s28hs512t_setup(struct spi_nor *nor, const struct flash_info *info,
+			   const struct spi_nor_flash_parameter *params,
+			   const struct spi_nor_hwcaps *hwcaps)
+{
+	struct spi_mem_op op;
+	u8 buf;
+	u8 addr_width = 3;
+	int ret;
+
+	/*
+	 * This Cypress flash also supports hybrid sector sizes. Make sure
+	 * uniform sector mode is selected. This is done by setting the bit
+	 * CFR3N[3].
+	 */
+	op = (struct spi_mem_op)
+		SPI_MEM_OP(SPI_MEM_OP_CMD(SPINOR_OP_RD_ANY_REG, 1),
+			   SPI_MEM_OP_ADDR(addr_width, SPINOR_REG_CYPRESS_CFR3N, 1),
+			   SPI_MEM_OP_NO_DUMMY,
+			   SPI_MEM_OP_DATA_IN(1, &buf, 1));
+	ret = spi_mem_exec_op(nor->spi, &op);
+	if (ret)
+		return ret;
+
+	ret = write_enable(nor);
+	if (ret)
+		return ret;
+
+	/* Set the uniform sector mode bit. */
+	buf |= SPINOR_REG_CYPRESS_CFR3N_UNISECT;
+	op = (struct spi_mem_op)
+		SPI_MEM_OP(SPI_MEM_OP_CMD(SPINOR_OP_WR_ANY_REG, 1),
+			   SPI_MEM_OP_ADDR(addr_width, SPINOR_REG_CYPRESS_CFR3N, 1),
+			   SPI_MEM_OP_NO_DUMMY,
+			   SPI_MEM_OP_DATA_OUT(1, &buf, 1));
+	ret = spi_mem_exec_op(nor->spi, &op);
+	if (ret) {
+		dev_err(nor->dev, "Failed to change to uniform sector mode\n");
+		return ret;
+	}
+
+	ret = spi_nor_wait_till_ready(nor);
+	if (ret)
+		return ret;
+
+	return spi_nor_default_setup(nor, info, params, hwcaps);
+}
+
+static void s28hs512t_default_init(struct spi_nor *nor)
+{
+	nor->octal_dtr_enable = spi_nor_cypress_octal_enable;
+	nor->setup = s28hs512t_setup;
+}
+
+static void s28hs512t_post_sfdp_fixup(struct spi_nor *nor,
+				      struct spi_nor_flash_parameter *params)
+{
+	/*
+	 * On older versions of the flash the xSPI Profile 1.0 table has the
+	 * 8D-8D-8D Fast Read opcode as 0x00. But it actually should be 0xEE.
+	 */
+	if (params->reads[SNOR_CMD_READ_8_8_8_DTR].opcode == 0)
+		params->reads[SNOR_CMD_READ_8_8_8_DTR].opcode =
+			SPINOR_OP_CYPRESS_RD_FAST;
+
+	/* This flash is also missing the 4-byte Page Program opcode bit. */
+	spi_nor_set_pp_settings(&params->page_programs[SNOR_CMD_PP],
+				SPINOR_OP_PP_4B, SNOR_PROTO_1_1_1);
+	/*
+	 * Since xSPI Page Program opcode is backward compatible with
+	 * Legacy SPI, use Legacy SPI opcode there as well.
+	 */
+	spi_nor_set_pp_settings(&params->page_programs[SNOR_CMD_PP_8_8_8_DTR],
+				SPINOR_OP_PP_4B, SNOR_PROTO_8_8_8_DTR);
+
+	/*
+	 * The xSPI Profile 1.0 table advertises the number of additional
+	 * address bytes needed for Read Status Register command as 0 but the
+	 * actual value for that is 4.
+	 */
+	params->rdsr_addr_nbytes = 4;
+}
+
+static int s28hs512t_post_bfpt_fixup(struct spi_nor *nor,
+				     const struct sfdp_parameter_header *bfpt_header,
+				     const struct sfdp_bfpt *bfpt,
+				     struct spi_nor_flash_parameter *params)
+{
+	struct spi_mem_op op;
+	u8 buf;
+	u8 addr_width = 3;
+	int ret;
+
+	/*
+	 * The BFPT table advertises a 512B page size but the page size is
+	 * actually configurable (with the default being 256B). Read from
+	 * CFR3V[4] and set the correct size.
+	 */
+	op = (struct spi_mem_op)
+		SPI_MEM_OP(SPI_MEM_OP_CMD(SPINOR_OP_RD_ANY_REG, 1),
+			   SPI_MEM_OP_ADDR(addr_width, SPINOR_REG_CYPRESS_CFR3V, 1),
+			   SPI_MEM_OP_NO_DUMMY,
+			   SPI_MEM_OP_DATA_IN(1, &buf, 1));
+	ret = spi_mem_exec_op(nor->spi, &op);
+	if (ret)
+		return ret;
+
+	if (buf & SPINOR_REG_CYPRESS_CFR3V_PGSZ)
+		params->page_size = 512;
+	else
+		params->page_size = 256;
+
+	/*
+	 * The BFPT advertises that it supports 4k erases, and the datasheet
+	 * says the same. But 4k erases did not work when testing. So, use 256k
+	 * erases for now.
+	 */
+	nor->erase_opcode = SPINOR_OP_SE_4B;
+	nor->mtd.erasesize = 0x40000;
+
+	return 0;
+}
+
+struct spi_nor_fixups s28hs512t_fixups = {
+	.default_init = s28hs512t_default_init,
+	.post_sfdp = s28hs512t_post_sfdp_fixup,
+	.post_bfpt = s28hs512t_post_bfpt_fixup,
+};
+#endif /* CONFIG_SPI_FLASH_SPANSION */
+
 /** spi_nor_octal_dtr_enable() - enable Octal DTR I/O if needed
  * @nor:                 pointer to a 'struct spi_nor'
  *
diff --git a/drivers/mtd/spi/spi-nor-ids.c b/drivers/mtd/spi/spi-nor-ids.c
index 973b6f86c9..951d7267e2 100644
--- a/drivers/mtd/spi/spi-nor-ids.c
+++ b/drivers/mtd/spi/spi-nor-ids.c
@@ -211,6 +211,7 @@  const struct flash_info spi_nor_ids[] = {
 	{ INFO("s25fl208k",  0x014014,      0,  64 * 1024,  16, SECT_4K | SPI_NOR_DUAL_READ) },
 	{ INFO("s25fl064l",  0x016017,      0,  64 * 1024, 128, SECT_4K | SPI_NOR_DUAL_READ | SPI_NOR_QUAD_READ | SPI_NOR_4B_OPCODES) },
 	{ INFO("s25fl128l",  0x016018,      0,  64 * 1024, 256, SECT_4K | SPI_NOR_DUAL_READ | SPI_NOR_QUAD_READ | SPI_NOR_4B_OPCODES) },
+	{ INFO("s28hs512t",  0x345b1a,      0, 256 * 1024, 256, SPI_NOR_OCTAL_DTR_READ) .fixups = &s28hs512t_fixups },
 #endif
 #ifdef CONFIG_SPI_FLASH_SST		/* SST */
 	/* SST -- large erase sizes are "overlays", "sectors" are 4K */
diff --git a/include/linux/mtd/spi-nor.h b/include/linux/mtd/spi-nor.h
index b397a19ccf..8e7b39d73c 100644
--- a/include/linux/mtd/spi-nor.h
+++ b/include/linux/mtd/spi-nor.h
@@ -155,6 +155,20 @@ 
 /* Status Register 2 bits. */
 #define SR2_QUAD_EN_BIT7	BIT(7)
 
+/* For Cypress flash. */
+#define SPINOR_OP_RD_ANY_REG			0x65	/* Read any register */
+#define SPINOR_OP_WR_ANY_REG			0x71	/* Write any register */
+#define SPINOR_REG_CYPRESS_CFR2V		0x00800003
+#define SPINOR_REG_CYPRESS_CFR2V_MEMLAT_8_20	0x8
+#define SPINOR_REG_CYPRESS_CFR3N		0x00000004
+#define SPINOR_REG_CYPRESS_CFR3V		0x00800004
+#define SPINOR_REG_CYPRESS_CFR3V_PGSZ		BIT(4) /* Page size. */
+#define SPINOR_REG_CYPRESS_CFR3N_UNISECT	BIT(3) /* Uniform sector mode */
+#define SPINOR_REG_CYPRESS_CFR4V		0x00800005
+#define SPINOR_REG_CYPRESS_CFR5V		0x00800006
+#define SPINOR_REG_CYPRESS_CFR5V_OCT_DTR_EN	0x3
+#define SPINOR_OP_CYPRESS_RD_FAST		0xee
+
 /* Supported SPI protocols */
 #define SNOR_PROTO_INST_MASK	GENMASK(23, 16)
 #define SNOR_PROTO_INST_SHIFT	16