mirror of https://github.com/hak5/openwrt-owl.git
188 lines
4.8 KiB
Diff
188 lines
4.8 KiB
Diff
From b6d5d4c3d595b4cfb6a052ac7151fdb1d9a776ea Mon Sep 17 00:00:00 2001
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From: John Crispin <blogic@openwrt.org>
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Date: Sun, 27 Jul 2014 09:58:09 +0100
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Subject: [PATCH 44/57] mtd: add chunked read io to m25p80
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Signed-off-by: John Crispin <blogic@openwrt.org>
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Signed-off-by: Felix Fietkau <nbd@openwrt.org>
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---
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drivers/mtd/devices/m25p80.c | 128 ++++++++++++++++++++++++++++++++++++++++++
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1 file changed, 128 insertions(+)
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--- a/drivers/mtd/devices/m25p80.c
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+++ b/drivers/mtd/devices/m25p80.c
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@@ -110,6 +110,7 @@ struct m25p {
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struct mtd_info mtd;
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u16 page_size;
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u16 addr_width;
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+ u16 chunk_size;
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u8 erase_opcode;
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u8 read_opcode;
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u8 program_opcode;
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@@ -562,6 +563,89 @@ static int m25p80_read(struct mtd_info *
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return 0;
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}
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+static int m25p80_read_chunked(struct mtd_info *mtd, loff_t from, size_t len,
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+ size_t *retlen, u_char *buf)
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+{
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+ struct m25p *flash = mtd_to_m25p(mtd);
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+ struct spi_transfer t[2];
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+ struct spi_message m;
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+ uint8_t opcode;
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+ int idx, rlen;
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+
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+ pr_debug("%s: %s from 0x%08x, len %zd\n", dev_name(&flash->spi->dev),
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+ __func__, (u32)from, len);
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+
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+ mutex_lock(&flash->lock);
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+ /* Wait till previous write/erase is done. */
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+ if (wait_till_ready(flash)) {
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+ /* REVISIT status return?? */
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+ mutex_unlock(&flash->lock);
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+ return 1;
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+ }
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+
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+ spi_message_init(&m);
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+ memset(t, 0, (sizeof t));
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+
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+ t[0].tx_buf = flash->command;
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+ t[0].len = m25p_cmdsz(flash);
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+ spi_message_add_tail(&t[0], &m);
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+ spi_message_add_tail(&t[1], &m);
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+
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+ *retlen = 0;
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+
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+ for (idx = 0; idx < len; idx += rlen) {
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+ rlen = min_t(int, flash->chunk_size, len - idx);
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+
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+ if (idx)
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+ wait_till_ready(flash);
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+
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+ t[1].rx_buf = &buf[idx];
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+ t[1].len = rlen;
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+
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+ /* Set up the write data buffer. */
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+ opcode = OPCODE_NORM_READ;
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+ flash->command[0] = opcode;
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+ m25p_addr2cmd(flash, from + idx, flash->command);
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+
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+ spi_sync(flash->spi, &m);
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+
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+ *retlen += m.actual_length - m25p_cmdsz(flash);
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+ }
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+
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+ mutex_unlock(&flash->lock);
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+
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+ return 0;
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+}
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+
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+static int m25p80_write_data(struct m25p *flash, struct spi_message *m,
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+ struct spi_transfer *t, int to)
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+{
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+ const void *buf = t->tx_buf;
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+ int len = t->len;
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+ int retlen = 0;
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+ int chunk_size;
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+
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+ chunk_size = flash->chunk_size;
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+ if (!chunk_size)
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+ chunk_size = len;
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+
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+ while (retlen < len) {
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+ t->tx_buf = buf + retlen;
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+ t->len = min_t(int, chunk_size, len - retlen);
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+
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+ if (retlen)
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+ wait_till_ready(flash);
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+
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+ write_enable(flash);
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+ m25p_addr2cmd(flash, to + retlen, flash->command);
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+ spi_sync(flash->spi, m);
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+
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+ retlen += m->actual_length - m25p_cmdsz(flash);
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+ }
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+
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+ return retlen;
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+}
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+
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/*
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* Write an address range to the flash chip. Data must be written in
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* FLASH_PAGESIZE chunks. The address range may be any size provided
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@@ -596,11 +680,8 @@ static int m25p80_write(struct mtd_info
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return 1;
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}
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- write_enable(flash);
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-
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/* Set up the opcode in the write buffer. */
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flash->command[0] = flash->program_opcode;
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- m25p_addr2cmd(flash, to, flash->command);
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page_offset = to & (flash->page_size - 1);
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@@ -608,9 +689,7 @@ static int m25p80_write(struct mtd_info
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if (page_offset + len <= flash->page_size) {
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t[1].len = len;
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- spi_sync(flash->spi, &m);
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-
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- *retlen = m.actual_length - m25p_cmdsz(flash);
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+ *retlen = m25p80_write_data(flash, &m, &t[1], to);
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} else {
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u32 i;
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@@ -618,9 +697,7 @@ static int m25p80_write(struct mtd_info
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page_size = flash->page_size - page_offset;
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t[1].len = page_size;
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- spi_sync(flash->spi, &m);
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-
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- *retlen = m.actual_length - m25p_cmdsz(flash);
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+ *retlen = m25p80_write_data(flash, &m, &t[1], to);
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/* write everything in flash->page_size chunks */
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for (i = page_size; i < len; i += page_size) {
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@@ -628,19 +705,12 @@ static int m25p80_write(struct mtd_info
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if (page_size > flash->page_size)
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page_size = flash->page_size;
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- /* write the next page to flash */
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- m25p_addr2cmd(flash, to + i, flash->command);
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-
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t[1].tx_buf = buf + i;
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t[1].len = page_size;
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wait_till_ready(flash);
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- write_enable(flash);
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-
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- spi_sync(flash->spi, &m);
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-
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- *retlen += m.actual_length - m25p_cmdsz(flash);
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+ *retlen += m25p80_write_data(flash, &m, &t[1], to + i);
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}
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}
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@@ -1105,6 +1175,7 @@ static int m25p_probe(struct spi_device
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struct mtd_part_parser_data ppdata;
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struct device_node *np = spi->dev.of_node;
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int ret;
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+ u32 val;
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/* Platform data helps sort out which chip type we have, as
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* well as how this board partitions it. If we don't have
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@@ -1187,6 +1258,12 @@ static int m25p_probe(struct spi_device
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flash->mtd._erase = m25p80_erase;
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flash->mtd._read = m25p80_read;
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+ if (np && !of_property_read_u32(np, "m25p,chunked-io", &val)) {
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+ dev_warn(&spi->dev, "using chunked io\n");
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+ flash->mtd._read = m25p80_read_chunked;
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+ flash->chunk_size = val;
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+ }
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+
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/* flash protection support for STmicro chips */
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if (JEDEC_MFR(info->jedec_id) == CFI_MFR_ST) {
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flash->mtd._lock = m25p80_lock;
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