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108 lines
3.2 KiB
Diff
108 lines
3.2 KiB
Diff
From acb2721e1cd2e7488a7b08a4ed590177369a1689 Mon Sep 17 00:00:00 2001
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From: Daniel Schwierzeck <daniel.schwierzeck@gmail.com>
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Date: Tue, 6 Nov 2012 19:10:40 +0100
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Subject: sf: factor out the flash address calculation
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Signed-off-by: Daniel Schwierzeck <daniel.schwierzeck@gmail.com>
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--- a/drivers/mtd/spi/spi_flash.c
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+++ b/drivers/mtd/spi/spi_flash.c
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@@ -15,12 +15,22 @@
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#include "spi_flash_internal.h"
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-static void spi_flash_addr(u32 addr, u8 *cmd)
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+static void spi_flash_addr(struct spi_flash *flash, u32 addr, u8 *cmd, u8 *cmd_len)
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{
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/* cmd[0] is actual command */
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cmd[1] = addr >> 16;
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cmd[2] = addr >> 8;
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cmd[3] = addr >> 0;
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+ *cmd_len = 4;
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+}
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+
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+static void spi_flash_page_addr(struct spi_flash *flash, u32 page_addr, u32 byte_addr, u8 *cmd, u8 *cmd_len)
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+{
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+ /* cmd[0] is actual command */
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+ cmd[1] = page_addr >> 8;
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+ cmd[2] = page_addr >> 0;
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+ cmd[3] = byte_addr;
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+ *cmd_len = 4;
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}
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static int spi_flash_read_write(struct spi_slave *spi,
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@@ -71,7 +81,7 @@ int spi_flash_cmd_write_multi(struct spi
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unsigned long page_addr, byte_addr, page_size;
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size_t chunk_len, actual;
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int ret;
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- u8 cmd[4];
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+ u8 cmd[4], cmd_len;
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page_size = flash->page_size;
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page_addr = offset / page_size;
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@@ -87,9 +97,7 @@ int spi_flash_cmd_write_multi(struct spi
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for (actual = 0; actual < len; actual += chunk_len) {
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chunk_len = min(len - actual, page_size - byte_addr);
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- cmd[1] = page_addr >> 8;
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- cmd[2] = page_addr;
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- cmd[3] = byte_addr;
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+ spi_flash_page_addr(flash, page_addr, byte_addr, cmd, &cmd_len);
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debug("PP: 0x%p => cmd = { 0x%02x 0x%02x%02x%02x } chunk_len = %zu\n",
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buf + actual, cmd[0], cmd[1], cmd[2], cmd[3], chunk_len);
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@@ -100,7 +108,7 @@ int spi_flash_cmd_write_multi(struct spi
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break;
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}
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- ret = spi_flash_cmd_write(flash->spi, cmd, 4,
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+ ret = spi_flash_cmd_write(flash->spi, cmd, cmd_len,
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buf + actual, chunk_len);
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if (ret < 0) {
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debug("SF: write failed\n");
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@@ -138,13 +146,13 @@ int spi_flash_read_common(struct spi_fla
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int spi_flash_cmd_read_fast(struct spi_flash *flash, u32 offset,
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size_t len, void *data)
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{
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- u8 cmd[5];
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+ u8 cmd[5], cmd_len;
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cmd[0] = CMD_READ_ARRAY_FAST;
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- spi_flash_addr(offset, cmd);
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- cmd[4] = 0x00;
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+ spi_flash_addr(flash, offset, cmd, &cmd_len);
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+ cmd[cmd_len] = 0x00;
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- return spi_flash_read_common(flash, cmd, sizeof(cmd), data, len);
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+ return spi_flash_read_common(flash, cmd, cmd_len + 1, data, len);
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}
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int spi_flash_cmd_poll_bit(struct spi_flash *flash, unsigned long timeout,
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@@ -194,7 +202,7 @@ int spi_flash_cmd_erase(struct spi_flash
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{
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u32 start, end, erase_size;
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int ret;
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- u8 cmd[4];
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+ u8 cmd[4], cmd_len;
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erase_size = flash->sector_size;
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if (offset % erase_size || len % erase_size) {
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@@ -216,7 +224,7 @@ int spi_flash_cmd_erase(struct spi_flash
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end = start + len;
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while (offset < end) {
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- spi_flash_addr(offset, cmd);
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+ spi_flash_addr(flash, offset, cmd, &cmd_len);
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offset += erase_size;
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debug("SF: erase %2x %2x %2x %2x (%x)\n", cmd[0], cmd[1],
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@@ -226,7 +234,7 @@ int spi_flash_cmd_erase(struct spi_flash
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if (ret)
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goto out;
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- ret = spi_flash_cmd_write(flash->spi, cmd, sizeof(cmd), NULL, 0);
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+ ret = spi_flash_cmd_write(flash->spi, cmd, cmd_len, NULL, 0);
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if (ret)
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goto out;
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