Merge tag 'spi-nor/for-6.2' into mtd/next

SPI NOR core changes:
* Add support for flash reset using the dt reset-gpios property.
* Update hwcaps.mask to include 8D-8D-8D read and page program ops
  when xSPI profile 1.0 table is defined.
* Bypass zero erase size in spi_nor_find_best_erase_type().
* Fix select_uniform_erase to skip 0 erase size
* Add generic flash driver. If a flash is not found in the flash_info
  array, fall back to the generic flash driver which is described solely
  by the flash's SFDP tables.
* Fix the number of bytes for the dummy cycles in
  spi_nor_spimem_check_readop().
* Introduce SPI_NOR_QUAD_PP flag, as PP_1_1_4 is not SFDP discoverable.

SPI NOR manufacturer drivers changes:
* Spansion:
  - use PARSE_SFDP for s28hs512t,
  - add support for s28hl512t, s28hl01gt, and s28hs01gt.
* Gigadevice: Replace default_init() with post_bfpt() for gd25q256.
* Micron - ST: Enable locking for mt25qu256a.
* Winbond: Add support for W25Q512NW-IQ.
* ISSI: Use PARSE_SFDP and SPI_NOR_QUAD_PP.

Fix merge conflict in the jedec,spi-nor bindings.

Signed-off-by: Miquel Raynal <miquel.raynal@bootlin.com>

Documentation/ABI/testing/sysfs-bus-spi-devices-spi-nor

@@ -5,13 +5,19 @@ Contact:	linux-mtd@lists.infradead.org
 Description:	(RO) The JEDEC ID of the SPI NOR flash as reported by the
 		flash device.
 
+		The attribute is not present if the flash doesn't support
+		the "Read JEDEC ID" command (9Fh). This is the case for
+		non-JEDEC compliant flashes.
 
 What:		/sys/bus/spi/devices/.../spi-nor/manufacturer
 Date:		April 2021
 KernelVersion:	5.14
 Contact:	linux-mtd@lists.infradead.org
 Description:	(RO) Manufacturer of the SPI NOR flash.
 
+		The attribute is not present if the flash device isn't
+		known to the kernel and is only probed by its SFDP
+		tables.
 
 What:		/sys/bus/spi/devices/.../spi-nor/partname
 Date:		April 2021

Documentation/devicetree/bindings/mtd/jedec,spi-nor.yaml

@@ -70,10 +70,17 @@ properties:
       be used on such systems, to denote the absence of a reliable reset
       mechanism.
 
+  reset-gpios:
+    description:
+      A GPIO line connected to the RESET (active low) signal of the device.
+      If "broken-flash-reset" is present then having this property does not
+      make any difference.
+
 unevaluatedProperties: false
 
 examples:
   - |
+    #include <dt-bindings/gpio/gpio.h>
     spi {
         #address-cells = <1>;
         #size-cells = <0>;
@@ -83,6 +90,7 @@ examples:
             reg = <0>;
             spi-max-frequency = <40000000>;
             m25p,fast-read;
+            reset-gpios = <&gpio 12 GPIO_ACTIVE_LOW>;
         };
     };
 ...

drivers/mtd/spi-nor/core.c

@@ -1184,6 +1184,8 @@ spi_nor_find_best_erase_type(const struct spi_nor_erase_map *map,
 			continue;
 
 		erase = &map->erase_type[i];
+		if (!erase->size)
+			continue;
 
 		/* Alignment is not mandatory for overlaid regions */
 		if (region->offset & SNOR_OVERLAID_REGION &&
@@ -1632,6 +1634,16 @@ static const struct spi_nor_manufacturer *manufacturers[] = {
 	&spi_nor_xmc,
 };
 
+static const struct flash_info spi_nor_generic_flash = {
+	.name = "spi-nor-generic",
+	/*
+	 * JESD216 rev A doesn't specify the page size, therefore we need a
+	 * sane default.
+	 */
+	.page_size = 256,
+	.parse_sfdp = true,
+};
+
 static const struct flash_info *spi_nor_match_id(struct spi_nor *nor,
 						 const u8 *id)
 {
@@ -1664,7 +1676,20 @@ static const struct flash_info *spi_nor_detect(struct spi_nor *nor)
 		return ERR_PTR(ret);
 	}
 
+	/* Cache the complete flash ID. */
+	nor->id = devm_kmemdup(nor->dev, id, SPI_NOR_MAX_ID_LEN, GFP_KERNEL);
+	if (!nor->id)
+		return ERR_PTR(-ENOMEM);
+
 	info = spi_nor_match_id(nor, id);
+
+	/* Fallback to a generic flash described only by its SFDP data. */
+	if (!info) {
+		ret = spi_nor_check_sfdp_signature(nor);
+		if (!ret)
+			info = &spi_nor_generic_flash;
+	}
+
 	if (!info) {
 		dev_err(nor->dev, "unrecognized JEDEC id bytes: %*ph\n",
 			SPI_NOR_MAX_ID_LEN, id);
@@ -1914,7 +1939,8 @@ static int spi_nor_spimem_check_readop(struct spi_nor *nor,
 	spi_nor_spimem_setup_op(nor, &op, read->proto);
 
 	/* convert the dummy cycles to the number of bytes */
-	op.dummy.nbytes = (nor->read_dummy * op.dummy.buswidth) / 8;
+	op.dummy.nbytes = (read->num_mode_clocks + read->num_wait_states) *
+			  op.dummy.buswidth / 8;
 	if (spi_nor_protocol_is_dtr(nor->read_proto))
 		op.dummy.nbytes *= 2;
 
@@ -2091,8 +2117,12 @@ static int spi_nor_select_pp(struct spi_nor *nor,
  * spi_nor_select_uniform_erase() - select optimum uniform erase type
  * @map:		the erase map of the SPI NOR
  * @wanted_size:	the erase type size to search for. Contains the value of
- *			info->sector_size or of the "small sector" size in case
- *			CONFIG_MTD_SPI_NOR_USE_4K_SECTORS is defined.
+ *			info->sector_size, the "small sector" size in case
+ *			CONFIG_MTD_SPI_NOR_USE_4K_SECTORS is defined or 0 if
+ *			there is no information about the sector size. The
+ *			latter is the case if the flash parameters are parsed
+ *			solely by SFDP, then the largest supported erase type
+ *			is selected.
  *
  * Once the optimum uniform sector erase command is found, disable all the
  * other.
@@ -2113,6 +2143,10 @@ spi_nor_select_uniform_erase(struct spi_nor_erase_map *map,
 
 		tested_erase = &map->erase_type[i];
 
+		/* Skip masked erase types. */
+		if (!tested_erase->size)
+			continue;
+
 		/*
 		 * If the current erase size is the one, stop here:
 		 * we have found the right uniform Sector Erase command.
@@ -2565,6 +2599,12 @@ static void spi_nor_init_default_params(struct spi_nor *nor)
 	params->hwcaps.mask |= SNOR_HWCAPS_PP;
 	spi_nor_set_pp_settings(&params->page_programs[SNOR_CMD_PP],
 				SPINOR_OP_PP, SNOR_PROTO_1_1_1);
+
+	if (info->flags & SPI_NOR_QUAD_PP) {
+		params->hwcaps.mask |= SNOR_HWCAPS_PP_1_1_4;
+		spi_nor_set_pp_settings(&params->page_programs[SNOR_CMD_PP_1_1_4],
+					SPINOR_OP_PP_1_1_4, SNOR_PROTO_1_1_4);
+	}
 }
 
 /**
@@ -2840,10 +2880,20 @@ static void spi_nor_put_device(struct mtd_info *mtd)
 
 void spi_nor_restore(struct spi_nor *nor)
 {
+	int ret;
+
 	/* restore the addressing mode */
 	if (nor->addr_nbytes == 4 && !(nor->flags & SNOR_F_4B_OPCODES) &&
-	    nor->flags & SNOR_F_BROKEN_RESET)
-		nor->params->set_4byte_addr_mode(nor, false);
+	    nor->flags & SNOR_F_BROKEN_RESET) {
+		ret = nor->params->set_4byte_addr_mode(nor, false);
+		if (ret)
+			/*
+			 * Do not stop the execution in the hope that the flash
+			 * will default to the 3-byte address mode after the
+			 * software reset.
+			 */
+			dev_err(nor->dev, "Failed to exit 4-byte address mode, err = %d\n", ret);
+	}
 
 	if (nor->flags & SNOR_F_SOFT_RESET)
 		spi_nor_soft_reset(nor);
@@ -2935,6 +2985,27 @@ static void spi_nor_set_mtd_info(struct spi_nor *nor)
 	mtd->_put_device = spi_nor_put_device;
 }
 
+static int spi_nor_hw_reset(struct spi_nor *nor)
+{
+	struct gpio_desc *reset;
+
+	reset = devm_gpiod_get_optional(nor->dev, "reset", GPIOD_OUT_LOW);
+	if (IS_ERR_OR_NULL(reset))
+		return PTR_ERR_OR_ZERO(reset);
+
+	/*
+	 * Experimental delay values by looking at different flash device
+	 * vendors datasheets.
+	 */
+	usleep_range(1, 5);
+	gpiod_set_value_cansleep(reset, 1);
+	usleep_range(100, 150);
+	gpiod_set_value_cansleep(reset, 0);
+	usleep_range(1000, 1200);
+
+	return 0;
+}
+
 int spi_nor_scan(struct spi_nor *nor, const char *name,
 		 const struct spi_nor_hwcaps *hwcaps)
 {
@@ -2967,6 +3038,10 @@ int spi_nor_scan(struct spi_nor *nor, const char *name,
 	if (!nor->bouncebuf)
 		return -ENOMEM;
 
+	ret = spi_nor_hw_reset(nor);
+	if (ret)
+		return ret;
+
 	info = spi_nor_get_flash_info(nor, name);
 	if (IS_ERR(info))
 		return PTR_ERR(info);

drivers/mtd/spi-nor/core.h

@@ -458,6 +458,7 @@ struct spi_nor_fixups {
  *   SPI_NOR_NO_ERASE:        no erase command needed.
  *   NO_CHIP_ERASE:           chip does not support chip erase.
  *   SPI_NOR_NO_FR:           can't do fastread.
+ *   SPI_NOR_QUAD_PP:         flash supports Quad Input Page Program.
  *
  * @no_sfdp_flags:  flags that indicate support that can be discovered via SFDP.
  *                  Used when SFDP tables are not defined in the flash. These
@@ -507,6 +508,7 @@ struct flash_info {
 #define SPI_NOR_NO_ERASE		BIT(6)
 #define NO_CHIP_ERASE			BIT(7)
 #define SPI_NOR_NO_FR			BIT(8)
+#define SPI_NOR_QUAD_PP			BIT(9)
 
 	u8 no_sfdp_flags;
 #define SPI_NOR_SKIP_SFDP		BIT(0)
@@ -701,6 +703,9 @@ int spi_nor_controller_ops_read_reg(struct spi_nor *nor, u8 opcode,
 int spi_nor_controller_ops_write_reg(struct spi_nor *nor, u8 opcode,
 				     const u8 *buf, size_t len);
 
+int spi_nor_check_sfdp_signature(struct spi_nor *nor);
+int spi_nor_parse_sfdp(struct spi_nor *nor);
+
 static inline struct spi_nor *mtd_to_spi_nor(struct mtd_info *mtd)
 {
 	return container_of(mtd, struct spi_nor, mtd);

drivers/mtd/spi-nor/debugfs.c

@@ -81,7 +81,7 @@ static int spi_nor_params_show(struct seq_file *s, void *data)
 	int i;
 
 	seq_printf(s, "name\t\t%s\n", info->name);
-	seq_printf(s, "id\t\t%*ph\n", info->id_len, info->id);
+	seq_printf(s, "id\t\t%*ph\n", SPI_NOR_MAX_ID_LEN, nor->id);
 	string_get_size(params->size, 1, STRING_UNITS_2, buf, sizeof(buf));
 	seq_printf(s, "size\t\t%s\n", buf);
 	seq_printf(s, "write size\t%u\n", params->writesize);

drivers/mtd/spi-nor/gigadevice.c

@@ -8,19 +8,29 @@
 
 #include "core.h"
 
-static void gd25q256_default_init(struct spi_nor *nor)
+static int
+gd25q256_post_bfpt(struct spi_nor *nor,
+		   const struct sfdp_parameter_header *bfpt_header,
+		   const struct sfdp_bfpt *bfpt)
 {
 	/*
-	 * Some manufacturer like GigaDevice may use different
-	 * bit to set QE on different memories, so the MFR can't
-	 * indicate the quad_enable method for this case, we need
-	 * to set it in the default_init fixup hook.
+	 * GD25Q256C supports the first version of JESD216 which does not define
+	 * the Quad Enable methods. Overwrite the default Quad Enable method.
+	 *
+	 * GD25Q256 GENERATION | SFDP MAJOR VERSION | SFDP MINOR VERSION
+	 *      GD25Q256C      | SFDP_JESD216_MAJOR | SFDP_JESD216_MINOR
+	 *      GD25Q256D      | SFDP_JESD216_MAJOR | SFDP_JESD216B_MINOR
+	 *      GD25Q256E      | SFDP_JESD216_MAJOR | SFDP_JESD216B_MINOR
 	 */
-	nor->params->quad_enable = spi_nor_sr1_bit6_quad_enable;
+	if (bfpt_header->major == SFDP_JESD216_MAJOR &&
+	    bfpt_header->minor == SFDP_JESD216_MINOR)
+		nor->params->quad_enable = spi_nor_sr1_bit6_quad_enable;
+
+	return 0;
 }
 
 static const struct spi_nor_fixups gd25q256_fixups = {
-	.default_init = gd25q256_default_init,
+	.post_bfpt = gd25q256_post_bfpt,
 };
 
 static const struct flash_info gigadevice_nor_parts[] = {

drivers/mtd/spi-nor/issi.c

@@ -70,9 +70,10 @@ static const struct flash_info issi_nor_parts[] = {
 		NO_SFDP_FLAGS(SECT_4K | SPI_NOR_DUAL_READ | SPI_NOR_QUAD_READ) },
 	{ "is25wp128",  INFO(0x9d7018, 0, 64 * 1024, 256)
 		NO_SFDP_FLAGS(SECT_4K | SPI_NOR_DUAL_READ | SPI_NOR_QUAD_READ) },
-	{ "is25wp256", INFO(0x9d7019, 0, 64 * 1024, 512)
-		NO_SFDP_FLAGS(SECT_4K | SPI_NOR_DUAL_READ | SPI_NOR_QUAD_READ)
+	{ "is25wp256", INFO(0x9d7019, 0, 0, 0)
+		PARSE_SFDP
 		FIXUP_FLAGS(SPI_NOR_4B_OPCODES)
+		FLAGS(SPI_NOR_QUAD_PP)
 		.fixups = &is25lp256_fixups },
 
 	/* PMC */

drivers/mtd/spi-nor/micron-st.c

@@ -52,18 +52,21 @@ static int micron_st_nor_octal_dtr_en(struct spi_nor *nor)
 	struct spi_mem_op op;
 	u8 *buf = nor->bouncebuf;
 	int ret;
+	u8 addr_mode_nbytes = nor->params->addr_mode_nbytes;
 
 	/* Use 20 dummy cycles for memory array reads. */
 	*buf = 20;
 	op = (struct spi_mem_op)
-		MICRON_ST_NOR_WR_ANY_REG_OP(3, SPINOR_REG_MT_CFR1V, 1, buf);
+		MICRON_ST_NOR_WR_ANY_REG_OP(addr_mode_nbytes,
+					    SPINOR_REG_MT_CFR1V, 1, buf);
 	ret = spi_nor_write_any_volatile_reg(nor, &op, nor->reg_proto);
 	if (ret)
 		return ret;
 
 	buf[0] = SPINOR_MT_OCT_DTR;
 	op = (struct spi_mem_op)
-		MICRON_ST_NOR_WR_ANY_REG_OP(3, SPINOR_REG_MT_CFR0V, 1, buf);
+		MICRON_ST_NOR_WR_ANY_REG_OP(addr_mode_nbytes,
+					    SPINOR_REG_MT_CFR0V, 1, buf);
 	ret = spi_nor_write_any_volatile_reg(nor, &op, nor->reg_proto);
 	if (ret)
 		return ret;
@@ -98,7 +101,8 @@ static int micron_st_nor_octal_dtr_dis(struct spi_nor *nor)
 	buf[0] = SPINOR_MT_EXSPI;
 	buf[1] = SPINOR_REG_MT_CFR1V_DEF;
 	op = (struct spi_mem_op)
-		MICRON_ST_NOR_WR_ANY_REG_OP(4, SPINOR_REG_MT_CFR0V, 2, buf);
+		MICRON_ST_NOR_WR_ANY_REG_OP(nor->addr_nbytes,
+					    SPINOR_REG_MT_CFR0V, 2, buf);
 	ret = spi_nor_write_any_volatile_reg(nor, &op, SNOR_PROTO_8_8_8_DTR);
 	if (ret)
 		return ret;
@@ -201,6 +205,8 @@ static const struct flash_info st_nor_parts[] = {
 		MFR_FLAGS(USE_FSR)
 	},
 	{ "mt25qu256a",  INFO6(0x20bb19, 0x104400, 64 * 1024,  512)
+		FLAGS(SPI_NOR_HAS_LOCK | SPI_NOR_HAS_TB | SPI_NOR_4BIT_BP |
+		      SPI_NOR_BP3_SR_BIT6)
 		NO_SFDP_FLAGS(SECT_4K | SPI_NOR_DUAL_READ | SPI_NOR_QUAD_READ)
 		FIXUP_FLAGS(SPI_NOR_4B_OPCODES)
 		MFR_FLAGS(USE_FSR)

drivers/mtd/spi-nor/sfdp.c

@@ -135,8 +135,7 @@ struct sfdp_4bait {
 /**
  * spi_nor_read_raw() - raw read of serial flash memory. read_opcode,
  *			addr_nbytes and read_dummy members of the struct spi_nor
- *			should be previously
- * set.
+ *			should be previously set.
  * @nor:	pointer to a 'struct spi_nor'
  * @addr:	offset in the serial flash memory
  * @len:	number of bytes to read
@@ -1183,10 +1182,17 @@ static int spi_nor_parse_profile1(struct spi_nor *nor,
 	dummy = round_up(dummy, 2);
 
 	/* Update the fast read settings. */
+	nor->params->hwcaps.mask |= SNOR_HWCAPS_READ_8_8_8_DTR;
 	spi_nor_set_read_settings(&nor->params->reads[SNOR_CMD_READ_8_8_8_DTR],
 				  0, dummy, opcode,
 				  SNOR_PROTO_8_8_8_DTR);
 
+	/*
+	 * Page Program is "Required Command" in the xSPI Profile 1.0. Update
+	 * the params->hwcaps.mask here.
+	 */
+	nor->params->hwcaps.mask |= SNOR_HWCAPS_PP_8_8_8_DTR;
+
 out:
 	kfree(dwords);
 	return ret;
@@ -1249,6 +1255,33 @@ static void spi_nor_post_sfdp_fixups(struct spi_nor *nor)
 		nor->info->fixups->post_sfdp(nor);
 }
 
+/**
+ * spi_nor_check_sfdp_signature() - check for a valid SFDP signature
+ * @nor:	pointer to a 'struct spi_nor'
+ *
+ * Used to detect if the flash supports the RDSFDP command as well as the
+ * presence of a valid SFDP table.
+ *
+ * Return: 0 on success, -errno otherwise.
+ */
+int spi_nor_check_sfdp_signature(struct spi_nor *nor)
+{
+	u32 signature;
+	int err;
+
+	/* Get the SFDP header. */
+	err = spi_nor_read_sfdp_dma_unsafe(nor, 0, sizeof(signature),
+					   &signature);
+	if (err < 0)
+		return err;
+
+	/* Check the SFDP signature. */
+	if (le32_to_cpu(signature) != SFDP_SIGNATURE)
+		return -EINVAL;
+
+	return 0;
+}
+
 /**
  * spi_nor_parse_sfdp() - parse the Serial Flash Discoverable Parameters.
  * @nor:		pointer to a 'struct spi_nor'