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-rw-r--r--target/linux/generic/patches-3.10/470-mtd-m25p80-add-pm25-flash-support.patch78
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;