X-Git-Url: https://git.archive.openwrt.org/?a=blobdiff_plain;f=target%2Flinux%2Framips%2Fpatches-3.14%2F0044-mtd-add-chunked-read-io-to-m25p80.patch;h=4031335b229385354bd48b45bdd83ccc353951c7;hb=e5220f44038170b9a40308c8c0cd87605ef998dd;hp=214e660f680b38c802a06687d23aa9df266e017c;hpb=fdf5ad7adca59f2f9eda671d538c58ab220713e0;p=openwrt.git diff --git a/target/linux/ramips/patches-3.14/0044-mtd-add-chunked-read-io-to-m25p80.patch b/target/linux/ramips/patches-3.14/0044-mtd-add-chunked-read-io-to-m25p80.patch index 214e660f68..4031335b22 100644 --- a/target/linux/ramips/patches-3.14/0044-mtd-add-chunked-read-io-to-m25p80.patch +++ b/target/linux/ramips/patches-3.14/0044-mtd-add-chunked-read-io-to-m25p80.patch @@ -4,15 +4,22 @@ Date: Sun, 27 Jul 2014 09:58:09 +0100 Subject: [PATCH 44/57] mtd: add chunked read io to m25p80 Signed-off-by: John Crispin +Signed-off-by: Felix Fietkau --- drivers/mtd/devices/m25p80.c | 128 ++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 128 insertions(+) -diff --git a/drivers/mtd/devices/m25p80.c b/drivers/mtd/devices/m25p80.c -index ad19139..6f4290e 100644 --- a/drivers/mtd/devices/m25p80.c +++ b/drivers/mtd/devices/m25p80.c -@@ -556,6 +556,58 @@ static int m25p80_read(struct mtd_info *mtd, loff_t from, size_t len, +@@ -110,6 +110,7 @@ struct m25p { + struct mtd_info mtd; + u16 page_size; + u16 addr_width; ++ u16 chunk_size; + u8 erase_opcode; + u8 read_opcode; + u8 program_opcode; +@@ -562,6 +563,89 @@ static int m25p80_read(struct mtd_info * return 0; } @@ -23,11 +30,19 @@ index ad19139..6f4290e 100644 + struct spi_transfer t[2]; + struct spi_message m; + uint8_t opcode; -+ int idx = 0; ++ int idx, rlen; + + pr_debug("%s: %s from 0x%08x, len %zd\n", dev_name(&flash->spi->dev), + __func__, (u32)from, len); + ++ 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; ++ } ++ + spi_message_init(&m); + memset(t, 0, (sizeof t)); + @@ -38,21 +53,15 @@ index ad19139..6f4290e 100644 + + *retlen = 0; + -+ while (idx < len) { -+ int rlen = (len - idx > 4) ? (4) : (len - idx); ++ for (idx = 0; idx < len; idx += rlen) { ++ rlen = min_t(int, flash->chunk_size, len - idx); ++ ++ if (idx) ++ wait_till_ready(flash); + + 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; @@ -61,106 +70,118 @@ index ad19139..6f4290e 100644 + spi_sync(flash->spi, &m); + + *retlen += m.actual_length - m25p_cmdsz(flash); -+ -+ mutex_unlock(&flash->lock); -+ idx += rlen; + } ++ ++ mutex_unlock(&flash->lock); ++ + 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 -@@ -643,6 +695,76 @@ static int m25p80_write(struct mtd_info *mtd, loff_t to, size_t len, - return 0; - } - -+static int m25p80_write_chunked(struct mtd_info *mtd, loff_t to, size_t len, -+ size_t *retlen, const u_char *buf) ++static int m25p80_write_data(struct m25p *flash, struct spi_message *m, ++ struct spi_transfer *t, int to) +{ -+ 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); ++ const void *buf = t->tx_buf; ++ int len = t->len; ++ int retlen = 0; ++ int chunk_size; + -+ 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; ++ chunk_size = flash->chunk_size; ++ if (!chunk_size) ++ chunk_size = len; + -+ *retlen = m.actual_length - m25p_cmdsz(flash); ++ while (retlen < len) { ++ t->tx_buf = buf + retlen; ++ t->len = min_t(int, chunk_size, len - retlen); + -+ /* 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); ++ if (retlen) ++ wait_till_ready(flash); + + write_enable(flash); ++ m25p_addr2cmd(flash, to + retlen, flash->command); ++ spi_sync(flash->spi, m); + -+ spi_sync(flash->spi, &m); -+ -+ *retlen += m.actual_length - m25p_cmdsz(flash); ++ retlen += m->actual_length - m25p_cmdsz(flash); + } + -+ mutex_unlock(&flash->lock); -+ -+ return 0; ++ return retlen; +} + - static int sst_write(struct mtd_info *mtd, loff_t to, size_t len, - size_t *retlen, const u_char *buf) - { -@@ -1252,6 +1374,12 @@ static int m25p_probe(struct spi_device *spi) - return -EINVAL; + /* + * Write an address range to the flash chip. Data must be written in + * FLASH_PAGESIZE chunks. The address range may be any size provided +@@ -596,11 +680,8 @@ static int m25p80_write(struct mtd_info + return 1; } -+ if (np && of_property_read_bool(np, "m25p,chunked-io")) { +- write_enable(flash); +- + /* Set up the opcode in the write buffer. */ + flash->command[0] = flash->program_opcode; +- m25p_addr2cmd(flash, to, flash->command); + + page_offset = to & (flash->page_size - 1); + +@@ -608,9 +689,7 @@ static int m25p80_write(struct mtd_info + if (page_offset + len <= flash->page_size) { + t[1].len = len; + +- spi_sync(flash->spi, &m); +- +- *retlen = m.actual_length - m25p_cmdsz(flash); ++ *retlen = m25p80_write_data(flash, &m, &t[1], to); + } else { + u32 i; + +@@ -618,9 +697,7 @@ static int m25p80_write(struct mtd_info + page_size = flash->page_size - page_offset; + + t[1].len = page_size; +- spi_sync(flash->spi, &m); +- +- *retlen = m.actual_length - m25p_cmdsz(flash); ++ *retlen = m25p80_write_data(flash, &m, &t[1], to); + + /* write everything in flash->page_size chunks */ + for (i = page_size; i < len; i += page_size) { +@@ -628,19 +705,12 @@ static int m25p80_write(struct mtd_info + if (page_size > flash->page_size) + page_size = flash->page_size; + +- /* write the next page to flash */ +- m25p_addr2cmd(flash, to + i, flash->command); +- + t[1].tx_buf = buf + i; + t[1].len = page_size; + + wait_till_ready(flash); + +- write_enable(flash); +- +- spi_sync(flash->spi, &m); +- +- *retlen += m.actual_length - m25p_cmdsz(flash); ++ *retlen += m25p80_write_data(flash, &m, &t[1], to + i); + } + } + +@@ -1105,6 +1175,7 @@ static int m25p_probe(struct spi_device + struct mtd_part_parser_data ppdata; + struct device_node *np = spi->dev.of_node; + int ret; ++ u32 val; + + /* Platform data helps sort out which chip type we have, as + * well as how this board partitions it. If we don't have +@@ -1187,6 +1258,12 @@ static int m25p_probe(struct spi_device + flash->mtd._erase = m25p80_erase; + flash->mtd._read = m25p80_read; + ++ if (np && !of_property_read_u32(np, "m25p,chunked-io", &val)) { + dev_warn(&spi->dev, "using chunked io\n"); + flash->mtd._read = m25p80_read_chunked; -+ flash->mtd._write = m25p80_write_chunked; ++ flash->chunk_size = val; + } + - flash->program_opcode = OPCODE_PP; - - if (info->addr_width) --- -1.7.10.4 - + /* flash protection support for STmicro chips */ + if (JEDEC_MFR(info->jedec_id) == CFI_MFR_ST) { + flash->mtd._lock = m25p80_lock;