Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S932553AbbLGOJX (ORCPT ); Mon, 7 Dec 2015 09:09:23 -0500 Received: from eusmtp01.atmel.com ([212.144.249.243]:10133 "EHLO eusmtp01.atmel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S932296AbbLGOJS (ORCPT ); Mon, 7 Dec 2015 09:09:18 -0500 From: Cyrille Pitchen To: , CC: , , , , , , , , , , , Cyrille Pitchen Subject: [PATCH linux-next 1/5] mtd: spi-nor: properly detect the memory when it boots in Quad or Dual mode Date: Mon, 7 Dec 2015 15:09:10 +0100 Message-ID: <813edd1addf9a09b9f01031d3cb279c8cdfe97bb.1449494420.git.cyrille.pitchen@atmel.com> X-Mailer: git-send-email 1.8.2.2 In-Reply-To: References: MIME-Version: 1.0 Content-Type: text/plain Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 6196 Lines: 181 The quad (or dual) mode of a spi-nor memory may be enabled at boot time by non-volatile bits in some setting register. Also such a mode may have already been enabled at early stage by some boot loader. Hence, we should not guess the spi-nor memory is always configured for the regular SPI 1-1-1 protocol. Micron and Macronix memories, once their Quad (or dual for Micron) mode enabled, no longer process the regular JEDEC Read ID (0x9f) command but instead reply to a new command: JEDEC Read ID Multiple I/O (0xaf). Besides, in Quad mode both memory manufacturers expect ALL commands to use the SPI 4-4-4 protocol. For Micron memories, enabling their Dual mode implies to use the SPI 2-2-2 protocol for ALL commands. Signed-off-by: Cyrille Pitchen --- drivers/mtd/spi-nor/spi-nor.c | 52 +++++++++++++++++++++++++++++++++++++++---- include/linux/mtd/spi-nor.h | 23 +++++++++++++++++-- 2 files changed, 69 insertions(+), 6 deletions(-) diff --git a/drivers/mtd/spi-nor/spi-nor.c b/drivers/mtd/spi-nor/spi-nor.c index 3b2460efc019..bf17736750c1 100644 --- a/drivers/mtd/spi-nor/spi-nor.c +++ b/drivers/mtd/spi-nor/spi-nor.c @@ -73,6 +73,11 @@ struct flash_info { #define JEDEC_MFR(info) ((info)->id[0]) +struct read_id_config { + enum read_mode mode; + enum spi_protocol proto; +}; + static const struct flash_info *spi_nor_match_id(const char *name); /* @@ -867,11 +872,16 @@ static const struct flash_info spi_nor_ids[] = { { }, }; -static const struct flash_info *spi_nor_read_id(struct spi_nor *nor) +static const struct flash_info *spi_nor_read_id(struct spi_nor *nor, + enum read_mode mode) { - int tmp; + int i, tmp; u8 id[SPI_NOR_MAX_ID_LEN]; const struct flash_info *info; + static const struct read_id_config configs[] = { + {SPI_NOR_QUAD, SPI_PROTO_4_4_4}, + {SPI_NOR_DUAL, SPI_PROTO_2_2_2} + }; tmp = nor->read_reg(nor, SPINOR_OP_RDID, id, SPI_NOR_MAX_ID_LEN); if (tmp < 0) { @@ -879,6 +889,34 @@ static const struct flash_info *spi_nor_read_id(struct spi_nor *nor) return ERR_PTR(tmp); } + /* Special case for Micron/Macronix qspi nor. */ + if ((id[0] == 0xff && id[1] == 0xff && id[2] == 0xff) || + (id[0] == 0x00 && id[1] == 0x00 && id[2] == 0x00)) + for (i = 0; i < ARRAY_SIZE(configs); ++i) { + if (configs[i].mode != mode) + continue; + + /* Set this protocol for all commands. */ + nor->reg_proto = configs[i].proto; + nor->read_proto = configs[i].proto; + nor->write_proto = configs[i].proto; + nor->erase_proto = configs[i].proto; + + /* + * Multiple I/O Read ID only returns the Manufacturer ID + * (1 byte) and the Device ID (2 bytes). So we reset the + * remaining bytes. + */ + memset(id, 0, sizeof(id)); + tmp = nor->read_reg(nor, SPINOR_OP_MIO_RDID, id, 3); + if (tmp < 0) { + dev_dbg(nor->dev, + "error %d reading JEDEC ID Multi I/O\n", + tmp); + return ERR_PTR(tmp); + } + } + for (tmp = 0; tmp < ARRAY_SIZE(spi_nor_ids) - 1; tmp++) { info = &spi_nor_ids[tmp]; if (info->id_len) { @@ -1178,11 +1216,17 @@ int spi_nor_scan(struct spi_nor *nor, const char *name, enum read_mode mode) if (ret) return ret; + /* Reset SPI protocol for all commands */ + nor->erase_proto = SPI_PROTO_1_1_1; + nor->read_proto = SPI_PROTO_1_1_1; + nor->write_proto = SPI_PROTO_1_1_1; + nor->reg_proto = SPI_PROTO_1_1_1; + if (name) info = spi_nor_match_id(name); /* Try to auto-detect if chip name wasn't specified or not found */ if (!info) - info = spi_nor_read_id(nor); + info = spi_nor_read_id(nor, mode); if (IS_ERR_OR_NULL(info)) return -ENOENT; @@ -1193,7 +1237,7 @@ int spi_nor_scan(struct spi_nor *nor, const char *name, enum read_mode mode) if (name && info->id_len) { const struct flash_info *jinfo; - jinfo = spi_nor_read_id(nor); + jinfo = spi_nor_read_id(nor, mode); if (IS_ERR(jinfo)) { return PTR_ERR(jinfo); } else if (jinfo != info) { diff --git a/include/linux/mtd/spi-nor.h b/include/linux/mtd/spi-nor.h index fac3f6f53981..c91986a99caf 100644 --- a/include/linux/mtd/spi-nor.h +++ b/include/linux/mtd/spi-nor.h @@ -75,8 +75,9 @@ #define SPINOR_OP_BRWR 0x17 /* Bank register write */ /* Used for Micron flashes only. */ -#define SPINOR_OP_RD_EVCR 0x65 /* Read EVCR register */ -#define SPINOR_OP_WD_EVCR 0x61 /* Write EVCR register */ +#define SPINOR_OP_MIO_RDID 0xaf /* Multiple I/O Read JEDEC ID */ +#define SPINOR_OP_RD_EVCR 0x65 /* Read EVCR register */ +#define SPINOR_OP_WD_EVCR 0x61 /* Write EVCR register */ /* Status Register bits. */ #define SR_WIP BIT(0) /* Write in progress */ @@ -105,6 +106,16 @@ enum read_mode { SPI_NOR_QUAD, }; +enum spi_protocol { + SPI_PROTO_1_1_1, /* SPI */ + SPI_PROTO_1_1_2, /* Dual Output */ + SPI_PROTO_1_1_4, /* Quad Output */ + SPI_PROTO_1_2_2, /* Dual IO */ + SPI_PROTO_1_4_4, /* Quad IO */ + SPI_PROTO_2_2_2, /* Dual Command */ + SPI_PROTO_4_4_4, /* Quad Command */ +}; + #define SPI_NOR_MAX_CMD_SIZE 8 enum spi_nor_ops { SPI_NOR_OPS_READ = 0, @@ -132,6 +143,10 @@ enum spi_nor_option_flags { * @flash_read: the mode of the read * @sst_write_second: used by the SST write operation * @flags: flag options for the current SPI-NOR (SNOR_F_*) + * @erase_proto: the SPI protocol used by erase operations + * @read_proto: the SPI protocol used by read operations + * @write_proto: the SPI protocol used by write operations + * @reg_proto the SPI protocol used by read_reg/write_reg operations * @cmd_buf: used by the write_reg * @prepare: [OPTIONAL] do some preparations for the * read/write/erase/lock/unlock operations @@ -160,6 +175,10 @@ struct spi_nor { u8 read_opcode; u8 read_dummy; u8 program_opcode; + enum spi_protocol erase_proto; + enum spi_protocol read_proto; + enum spi_protocol write_proto; + enum spi_protocol reg_proto; enum read_mode flash_read; bool sst_write_second; u32 flags; -- 1.8.2.2 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/