diff options
Diffstat (limited to 'target/linux/generic/patches-3.10/470-mtd-m25p80-add-pm25-flash-support.patch')
| -rw-r--r-- | target/linux/generic/patches-3.10/470-mtd-m25p80-add-pm25-flash-support.patch | 78 |
1 files changed, 78 insertions, 0 deletions
diff --git a/target/linux/generic/patches-3.10/470-mtd-m25p80-add-pm25-flash-support.patch b/target/linux/generic/patches-3.10/470-mtd-m25p80-add-pm25-flash-support.patch new file mode 100644 index 0000000000..7e62e2862c --- /dev/null +++ b/target/linux/generic/patches-3.10/470-mtd-m25p80-add-pm25-flash-support.patch @@ -0,0 +1,78 @@ +From dbca80cf6b3c0d0f130cdfb4b1f19f2092f62174 Mon Sep 17 00:00:00 2001 +From: Michel Stempin <michel.stempin@wanadoo.fr> +Date: Sun, 18 Aug 2013 00:50:26 +0200 +Subject: [PATCH v2] mtd: m25p80: add support for PMC SPI flash + +This patch adds support for PMC (now Chingis, part of ISSI) Pm25LV512 (512 +kBbit), Pm25LV010 (1 Mbit) and Pm25LQ032 (32 Mbit) SPI flash. + +Two generations of PMC SPI flash chips are addressed: + +1) Pm25LV512 and Pm25LV010 - These have 4KB sectors and 32KB blocks. The 4KB +sector erase uses a non-standard opcode (0xd7). They do not support JEDEC RDID +(0x9f), and so they can only be detected by matching their name string with +pre-configured platform data. Because of the cascaded acquisitions, the +datasheet is no longer available on the current manufacturer's website, +although it is still commonly used in some recent wireless routers [1]. Only +public datasheet available seems to be on GeoCities [2]. + +2) Pm25LQ032 - A newer generation flash, with 4KB sectors and 32KB blocks. It +uses the standard erase and JEDEC read-ID opcodes. Manufacturer's datasheet is +available [3]. + +[1] https://forum.openwrt.org/viewtopic.php?pid=186360#p186360 +[2] http://www.geocities.jp/scottle556/pdf/Pm25LV512-010.pdf +[3] http://www.chingistek.com/img/Product_Files/Pm25LQ032C%20datasheet%20v1.6.1.pdf + +Signed-off-by: Gabor Juhos <juhosg@openwrt.org> +Signed-off-by: Michel Stempin <michel.stempin@wanadoo.fr> +CC: Brian Norris <computersforpeace@gmail.com> +CC: Artem Bityutskiy <artem.bityutskiy@linux.intel.com> +--- + +Changes in v2: + - style and documentation improvements + + drivers/mtd/devices/m25p80.c | 10 ++++++++++ + 1 file changed, 10 insertions(+) + +--- a/drivers/mtd/devices/m25p80.c ++++ b/drivers/mtd/devices/m25p80.c +@@ -45,6 +45,7 @@ + #define OPCODE_BE_4K 0x20 /* Erase 4KiB block */ + #define OPCODE_BE_32K 0x52 /* Erase 32KiB block */ + #define OPCODE_CHIP_ERASE 0xc7 /* Erase whole flash chip */ ++#define OPCODE_BE_4K_PMC 0xd7 /* Erase 4KiB block on PMC chips*/ + #define OPCODE_SE 0xd8 /* Sector erase (usually 64KiB) */ + #define OPCODE_RDID 0x9f /* Read JEDEC ID */ + +@@ -682,6 +683,7 @@ struct flash_info { + #define SECT_4K 0x01 /* OPCODE_BE_4K works uniformly */ + #define M25P_NO_ERASE 0x02 /* No erase command needed */ + #define SST_WRITE 0x04 /* use SST byte programming */ ++#define SECT_4K_PMC 0x08 /* OPCODE_BE_4K_PMC works uniformly */ + }; + + #define INFO(_jedec_id, _ext_id, _sector_size, _n_sectors, _flags) \ +@@ -765,6 +767,11 @@ static const struct spi_device_id m25p_i + { "n25q128a13", INFO(0x20ba18, 0, 64 * 1024, 256, 0) }, + { "n25q256a", INFO(0x20ba19, 0, 64 * 1024, 512, SECT_4K) }, + ++ /* PMC -- pm25x "blocks" are 32K, sectors are 4K */ ++ { "pm25lv512", INFO(0, 0, 32 * 1024, 2, SECT_4K_PMC) }, ++ { "pm25lv010", INFO(0, 0, 32 * 1024, 4, SECT_4K_PMC) }, ++ { "pm25lq032", INFO(0x7F9D46, 0, 64 * 1024, 64, SECT_4K) }, ++ + /* Spansion -- single (large) sector size only, at least + * for the chips listed here (without boot sectors). + */ +@@ -1017,6 +1024,9 @@ static int m25p_probe(struct spi_device + if (info->flags & SECT_4K) { + flash->erase_opcode = OPCODE_BE_4K; + flash->mtd.erasesize = 4096; ++ } else if (info->flags & SECT_4K_PMC) { ++ flash->erase_opcode = OPCODE_BE_4K_PMC; ++ flash->mtd.erasesize = 4096; + } else { + flash->erase_opcode = OPCODE_SE; + flash->mtd.erasesize = info->sector_size; |