diff options
Diffstat (limited to 'target/linux/ramips/patches-3.10/0131-mtd-add-chunked-read-io-to-m25p80.patch')
-rw-r--r-- | target/linux/ramips/patches-3.10/0131-mtd-add-chunked-read-io-to-m25p80.patch | 161 |
1 files changed, 0 insertions, 161 deletions
diff --git a/target/linux/ramips/patches-3.10/0131-mtd-add-chunked-read-io-to-m25p80.patch b/target/linux/ramips/patches-3.10/0131-mtd-add-chunked-read-io-to-m25p80.patch deleted file mode 100644 index 74453e1..0000000 --- a/target/linux/ramips/patches-3.10/0131-mtd-add-chunked-read-io-to-m25p80.patch +++ /dev/null @@ -1,161 +0,0 @@ -From f85e6dacdb7d7a9bc37f33cf8770006ab64286f7 Mon Sep 17 00:00:00 2001 -From: John Crispin <blogic@openwrt.org> -Date: Wed, 27 Nov 2013 20:58:16 +0100 -Subject: [PATCH 131/133] mtd: add chunked read io to m25p80 - -Signed-off-by: John Crispin <blogic@openwrt.org> ---- - drivers/mtd/devices/m25p80.c | 127 ++++++++++++++++++++++++++++++++++++++++++ - 1 file changed, 127 insertions(+) - ---- a/drivers/mtd/devices/m25p80.c -+++ b/drivers/mtd/devices/m25p80.c -@@ -392,6 +392,58 @@ static int m25p80_read(struct mtd_info * - return 0; - } - -+static int m25p80_read_chunked(struct mtd_info *mtd, loff_t from, size_t len, -+ size_t *retlen, u_char *buf) -+{ -+ struct m25p *flash = mtd_to_m25p(mtd); -+ struct spi_transfer t[2]; -+ struct spi_message m; -+ uint8_t opcode; -+ int idx = 0; -+ -+ pr_debug("%s: %s from 0x%08x, len %zd\n", dev_name(&flash->spi->dev), -+ __func__, (u32)from, len); -+ -+ spi_message_init(&m); -+ memset(t, 0, (sizeof t)); -+ -+ t[0].tx_buf = flash->command; -+ t[0].len = m25p_cmdsz(flash); -+ spi_message_add_tail(&t[0], &m); -+ spi_message_add_tail(&t[1], &m); -+ -+ *retlen = 0; -+ -+ while (idx < len) { -+ int rlen = (len - idx > 4) ? (4) : (len - idx); -+ -+ t[1].rx_buf = &buf[idx]; -+ t[1].len = rlen; -+ -+ mutex_lock(&flash->lock); -+ -+ /* Wait till previous write/erase is done. */ -+ if (wait_till_ready(flash)) { -+ /* REVISIT status return?? */ -+ mutex_unlock(&flash->lock); -+ return 1; -+ } -+ -+ /* Set up the write data buffer. */ -+ opcode = OPCODE_NORM_READ; -+ flash->command[0] = opcode; -+ m25p_addr2cmd(flash, from + idx, flash->command); -+ -+ spi_sync(flash->spi, &m); -+ -+ *retlen += m.actual_length - m25p_cmdsz(flash); -+ -+ mutex_unlock(&flash->lock); -+ idx += rlen; -+ } -+ return 0; -+} -+ - /* - * Write an address range to the flash chip. Data must be written in - * FLASH_PAGESIZE chunks. The address range may be any size provided -@@ -479,6 +531,76 @@ static int m25p80_write(struct mtd_info - return 0; - } - -+static int m25p80_write_chunked(struct mtd_info *mtd, loff_t to, size_t len, -+ size_t *retlen, const u_char *buf) -+{ -+ struct m25p *flash = mtd_to_m25p(mtd); -+ struct spi_transfer t; -+ struct spi_message m; -+ u32 i, page_size; -+ u8 tmp[8]; -+ -+ pr_debug("%s: %s to 0x%08x, len %zd\n", dev_name(&flash->spi->dev), -+ __func__, (u32)to, len); -+ -+ spi_message_init(&m); -+ memset(&t, 0, (sizeof t)); -+ -+ t.tx_buf = tmp; -+ t.len = 8; -+ spi_message_add_tail(&t, &m); -+ -+ mutex_lock(&flash->lock); -+ -+ /* Wait until finished previous write command. */ -+ if (wait_till_ready(flash)) { -+ mutex_unlock(&flash->lock); -+ return 1; -+ } -+ -+ write_enable(flash); -+ -+ /* Set up the opcode in the write buffer. */ -+ flash->command[0] = OPCODE_PP; -+ m25p_addr2cmd(flash, to, flash->command); -+ -+ t.len = 4 + (to & 0x3); -+ if (t.len == 4) -+ t.len = 8; -+ memcpy(tmp, flash->command, 4); -+ memcpy(&tmp[4], buf, t.len - 4); -+ spi_sync(flash->spi, &m); -+ page_size = t.len - 4; -+ -+ *retlen = m.actual_length - m25p_cmdsz(flash); -+ -+ /* write everything in flash->page_size chunks */ -+ for (i = page_size; i < len; i += page_size) { -+ page_size = len - i; -+ if (page_size > 4) -+ page_size = 4; -+ -+ /* write the next page to flash */ -+ m25p_addr2cmd(flash, to + i, flash->command); -+ -+ memcpy(tmp, flash->command, 4); -+ memcpy(&tmp[4], buf + i, page_size); -+ t.len = 4 + page_size; -+ -+ wait_till_ready(flash); -+ -+ write_enable(flash); -+ -+ spi_sync(flash->spi, &m); -+ -+ *retlen += m.actual_length - m25p_cmdsz(flash); -+ } -+ -+ mutex_unlock(&flash->lock); -+ -+ return 0; -+} -+ - static int sst_write(struct mtd_info *mtd, loff_t to, size_t len, - size_t *retlen, const u_char *buf) - { -@@ -1059,6 +1181,12 @@ static int m25p_probe(struct spi_device - flash->fast_read = true; - #endif - -+ if (np && of_property_read_bool(np, "m25p,chunked-io")) { -+ dev_warn(&spi->dev, "using chunked io\n"); -+ flash->mtd._read = m25p80_read_chunked; -+ flash->mtd._write = m25p80_write_chunked; -+ } -+ - #ifdef CONFIG_M25PXX_USE_FAST_READ - flash->fast_read = true; - #endif |