diff options
Diffstat (limited to 'target/linux/generic/pending-4.4/042-0006-mtd-bcm47xxsflash-support-reading-flash-out-of-mappi.patch')
| -rw-r--r-- | target/linux/generic/pending-4.4/042-0006-mtd-bcm47xxsflash-support-reading-flash-out-of-mappi.patch | 81 |
1 files changed, 0 insertions, 81 deletions
diff --git a/target/linux/generic/pending-4.4/042-0006-mtd-bcm47xxsflash-support-reading-flash-out-of-mappi.patch b/target/linux/generic/pending-4.4/042-0006-mtd-bcm47xxsflash-support-reading-flash-out-of-mappi.patch deleted file mode 100644 index ecdae2a871..0000000000 --- a/target/linux/generic/pending-4.4/042-0006-mtd-bcm47xxsflash-support-reading-flash-out-of-mappi.patch +++ /dev/null @@ -1,81 +0,0 @@ -From ccc38234fdc70120be79e7fb2df5c27ca5cd4c8a Mon Sep 17 00:00:00 2001 -From: =?UTF-8?q?Rafa=C5=82=20Mi=C5=82ecki?= <rafal@milecki.pl> -Date: Wed, 8 Feb 2017 23:53:44 +0100 -Subject: [PATCH] mtd: bcm47xxsflash: support reading flash out of mapping - window -MIME-Version: 1.0 -Content-Type: text/plain; charset=UTF-8 -Content-Transfer-Encoding: 8bit - -For reading flash content we use MMIO but it's possible to read only -first 16 MiB this way. It's simply an arch design/limitation. -To support flash sizes bigger than 16 MiB implement indirect access -using ChipCommon registers. -This has been tested using MX25L25635F. - -Signed-off-by: Rafał Miłecki <rafal@milecki.pl> -Acked-by: Marek Vasut <marek.vasut@gmail.com> -Signed-off-by: Brian Norris <computersforpeace@gmail.com> ---- - drivers/mtd/devices/bcm47xxsflash.c | 24 +++++++++++++++++++++--- - drivers/mtd/devices/bcm47xxsflash.h | 3 +++ - 2 files changed, 24 insertions(+), 3 deletions(-) - ---- a/drivers/mtd/devices/bcm47xxsflash.c -+++ b/drivers/mtd/devices/bcm47xxsflash.c -@@ -105,15 +105,33 @@ static int bcm47xxsflash_read(struct mtd - size_t *retlen, u_char *buf) - { - struct bcm47xxsflash *b47s = mtd->priv; -+ size_t orig_len = len; - - /* Check address range */ - if ((from + len) > mtd->size) - return -EINVAL; - -- memcpy_fromio(buf, b47s->window + from, len); -- *retlen = len; -+ /* Read as much as possible using fast MMIO window */ -+ if (from < BCM47XXSFLASH_WINDOW_SZ) { -+ size_t memcpy_len; - -- return len; -+ memcpy_len = min(len, (size_t)(BCM47XXSFLASH_WINDOW_SZ - from)); -+ memcpy_fromio(buf, b47s->window + from, memcpy_len); -+ from += memcpy_len; -+ len -= memcpy_len; -+ buf += memcpy_len; -+ } -+ -+ /* Use indirect access for content out of the window */ -+ for (; len; len--) { -+ b47s->cc_write(b47s, BCMA_CC_FLASHADDR, from++); -+ bcm47xxsflash_cmd(b47s, OPCODE_ST_READ4B); -+ *buf++ = b47s->cc_read(b47s, BCMA_CC_FLASHDATA); -+ } -+ -+ *retlen = orig_len; -+ -+ return orig_len; - } - - static int bcm47xxsflash_write_st(struct mtd_info *mtd, u32 offset, size_t len, ---- a/drivers/mtd/devices/bcm47xxsflash.h -+++ b/drivers/mtd/devices/bcm47xxsflash.h -@@ -3,6 +3,8 @@ - - #include <linux/mtd/mtd.h> - -+#define BCM47XXSFLASH_WINDOW_SZ SZ_16M -+ - /* Used for ST flashes only. */ - #define OPCODE_ST_WREN 0x0006 /* Write Enable */ - #define OPCODE_ST_WRDIS 0x0004 /* Write Disable */ -@@ -16,6 +18,7 @@ - #define OPCODE_ST_RES 0x03ab /* Read Electronic Signature */ - #define OPCODE_ST_CSA 0x1000 /* Keep chip select asserted */ - #define OPCODE_ST_SSE 0x0220 /* Sub-sector Erase */ -+#define OPCODE_ST_READ4B 0x6313 /* Read Data Bytes in 4Byte addressing mode */ - - /* Used for Atmel flashes only. */ - #define OPCODE_AT_READ 0x07e8 |