103 lines
2.4 KiB
Diff
103 lines
2.4 KiB
Diff
--- a/drivers/mtd/devices/m25p80.c
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+++ b/drivers/mtd/devices/m25p80.c
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@@ -19,6 +19,7 @@
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#include <linux/errno.h>
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#include <linux/module.h>
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#include <linux/device.h>
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+#include <linux/of.h>
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#include <linux/mtd/mtd.h>
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#include <linux/mtd/partitions.h>
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@@ -32,6 +33,7 @@ struct m25p {
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struct spi_device *spi;
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struct spi_nor spi_nor;
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struct mtd_info mtd;
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+ u16 chunk_size;
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u8 command[MAX_CMD_SIZE];
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};
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@@ -157,6 +159,61 @@ static int m25p80_read(struct spi_nor *n
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return 0;
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}
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+static void m25p80_chunked_write(struct spi_nor *nor, loff_t _from, size_t _len,
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+ size_t *_retlen, const u_char *_buf)
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+{
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+ struct m25p *flash = nor->priv;
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+ int chunk_size;
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+ int retlen = 0;
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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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+ if (nor->addr_width > 3)
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+ chunk_size -= nor->addr_width - 3;
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+
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+ while (retlen < _len) {
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+ size_t len = min_t(int, chunk_size, _len - retlen);
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+ const u_char *buf = _buf + retlen;
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+ loff_t from = _from + retlen;
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+
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+ nor->wait_till_ready(nor);
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+ nor->write_reg(nor, SPINOR_OP_WREN, NULL, 0, 0);
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+
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+ m25p80_write(nor, from, len, &retlen, buf);
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+ }
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+ *_retlen += retlen;
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+}
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+
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+static int m25p80_chunked_read(struct spi_nor *nor, 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 = nor->priv;
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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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+ *_retlen = 0;
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+
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+ while (*_retlen < _len) {
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+ size_t len = min_t(int, chunk_size, _len - *_retlen);
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+ u_char *buf = _buf + *_retlen;
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+ loff_t from = _from + *_retlen;
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+ int retlen = 0;
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+ int ret = m25p80_read(nor, from, len, &retlen, buf);
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+
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+ if (ret)
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+ return ret;
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+
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+ *_retlen += retlen;
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+ }
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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_erase(struct spi_nor *nor, loff_t offset)
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{
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struct m25p *flash = nor->priv;
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@@ -197,6 +254,7 @@ static int m25p_probe(struct spi_device
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struct spi_nor *nor;
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enum read_mode mode = SPI_NOR_NORMAL;
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char *flash_name = NULL;
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+ u32 val;
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int ret;
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data = dev_get_platdata(&spi->dev);
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@@ -244,6 +302,14 @@ static int m25p_probe(struct spi_device
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if (ret)
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return ret;
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+ if (spi->dev.of_node &&
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+ !of_property_read_u32(spi->dev.of_node, "m25p,chunked-io", &val)) {
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+ dev_warn(&spi->dev, "using chunked io\n");
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+ nor->read = m25p80_chunked_read;
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+ nor->write = m25p80_chunked_write;
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+ flash->chunk_size = val;
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+ }
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+
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ppdata.of_node = spi->dev.of_node;
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return mtd_device_parse_register(&flash->mtd, NULL, &ppdata,
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