aboutsummaryrefslogtreecommitdiffstats
path: root/target/linux/brcm47xx/patches-3.9/070-bcma-add-functions-to-write-to-serial-flash.patch
diff options
context:
space:
mode:
Diffstat (limited to 'target/linux/brcm47xx/patches-3.9/070-bcma-add-functions-to-write-to-serial-flash.patch')
-rw-r--r--target/linux/brcm47xx/patches-3.9/070-bcma-add-functions-to-write-to-serial-flash.patch300
1 files changed, 300 insertions, 0 deletions
diff --git a/target/linux/brcm47xx/patches-3.9/070-bcma-add-functions-to-write-to-serial-flash.patch b/target/linux/brcm47xx/patches-3.9/070-bcma-add-functions-to-write-to-serial-flash.patch
new file mode 100644
index 0000000000..3a06b52d35
--- /dev/null
+++ b/target/linux/brcm47xx/patches-3.9/070-bcma-add-functions-to-write-to-serial-flash.patch
@@ -0,0 +1,300 @@
+--- a/drivers/bcma/driver_chipcommon_sflash.c
++++ b/drivers/bcma/driver_chipcommon_sflash.c
+@@ -1,6 +1,9 @@
+ /*
+ * Broadcom specific AMBA
+ * ChipCommon serial flash interface
++ * Copyright 2011, Jonas Gorski <jonas.gorski@gmail.com>
++ * Copyright 2011, 2012, Hauke Mehrtens <hauke@hauke-m.de>
++ * Copyright 2010, Broadcom Corporation
+ *
+ * Licensed under the GNU/GPL. See COPYING for details.
+ */
+@@ -8,7 +11,11 @@
+ #include "bcma_private.h"
+
+ #include <linux/platform_device.h>
++#include <linux/delay.h>
+ #include <linux/bcma/bcma.h>
++#include <linux/bcma/bcma_driver_chipcommon.h>
++
++#define NUM_RETRIES 3
+
+ static struct resource bcma_sflash_resource = {
+ .name = "bcma_sflash",
+@@ -18,7 +25,7 @@ static struct resource bcma_sflash_resou
+ };
+
+ struct platform_device bcma_sflash_dev = {
+- .name = "bcma_sflash",
++ .name = "bcm47xx-sflash",
+ .resource = &bcma_sflash_resource,
+ .num_resources = 1,
+ };
+@@ -30,7 +37,7 @@ struct bcma_sflash_tbl_e {
+ u16 numblocks;
+ };
+
+-static struct bcma_sflash_tbl_e bcma_sflash_st_tbl[] = {
++static const struct bcma_sflash_tbl_e bcma_sflash_st_tbl[] = {
+ { "M25P20", 0x11, 0x10000, 4, },
+ { "M25P40", 0x12, 0x10000, 8, },
+
+@@ -41,7 +48,7 @@ static struct bcma_sflash_tbl_e bcma_sfl
+ { 0 },
+ };
+
+-static struct bcma_sflash_tbl_e bcma_sflash_sst_tbl[] = {
++static const struct bcma_sflash_tbl_e bcma_sflash_sst_tbl[] = {
+ { "SST25WF512", 1, 0x1000, 16, },
+ { "SST25VF512", 0x48, 0x1000, 16, },
+ { "SST25WF010", 2, 0x1000, 32, },
+@@ -59,7 +66,7 @@ static struct bcma_sflash_tbl_e bcma_sfl
+ { 0 },
+ };
+
+-static struct bcma_sflash_tbl_e bcma_sflash_at_tbl[] = {
++static const struct bcma_sflash_tbl_e bcma_sflash_at_tbl[] = {
+ { "AT45DB011", 0xc, 256, 512, },
+ { "AT45DB021", 0x14, 256, 1024, },
+ { "AT45DB041", 0x1c, 256, 2048, },
+@@ -84,12 +91,186 @@ static void bcma_sflash_cmd(struct bcma_
+ bcma_err(cc->core->bus, "SFLASH control command failed (timeout)!\n");
+ }
+
++static void bcma_sflash_write_u8(struct bcma_drv_cc *cc, u32 offset, u8 byte)
++{
++ bcma_cc_write32(cc, BCMA_CC_FLASHADDR, offset);
++ bcma_cc_write32(cc, BCMA_CC_FLASHDATA, byte);
++}
++
++/* Poll for command completion. Returns zero when complete. */
++static int bcma_sflash_poll(struct bcm47xxsflash *dev, u32 offset)
++{
++ struct bcma_drv_cc *cc = dev->bcc;
++
++ if (offset >= cc->sflash.size)
++ return -22;
++
++ switch (cc->capabilities & BCMA_CC_CAP_FLASHT) {
++ case BCMA_CC_FLASHT_STSER:
++ /* Check for ST Write In Progress bit */
++ bcma_sflash_cmd(cc, BCMA_CC_FLASHCTL_ST_RDSR);
++ return bcma_cc_read32(cc, BCMA_CC_FLASHDATA)
++ & BCMA_CC_FLASHDATA_ST_WIP;
++ case BCMA_CC_FLASHT_ATSER:
++ /* Check for Atmel Ready bit */
++ bcma_sflash_cmd(cc, BCMA_CC_FLASHCTL_AT_STATUS);
++ return !(bcma_cc_read32(cc, BCMA_CC_FLASHDATA)
++ & BCMA_CC_FLASHDATA_AT_READY);
++ }
++
++ return 0;
++}
++
++static int sflash_st_write(struct bcm47xxsflash *dev, u32 offset, u32 len,
++ const u8 *buf)
++{
++ int written = 1;
++ struct bcma_drv_cc *cc = dev->bcc;
++
++ /* Enable writes */
++ bcma_sflash_cmd(cc, BCMA_CC_FLASHCTL_ST_WREN);
++ bcma_sflash_write_u8(cc, offset, *buf++);
++ /* Issue a page program with CSA bit set */
++ bcma_sflash_cmd(cc, BCMA_CC_FLASHCTL_ST_CSA | BCMA_CC_FLASHCTL_ST_PP);
++ offset++;
++ len--;
++ while (len > 0) {
++ if ((offset & 255) == 0) {
++ /* Page boundary, poll droping cs and return */
++ bcma_cc_write32(cc, BCMA_CC_FLASHCTL, 0);
++ udelay(1);
++ if (!bcma_sflash_poll(dev, offset)) {
++ /* Flash rejected command */
++ return -EAGAIN;
++ }
++ return written;
++ } else {
++ /* Write single byte */
++ bcma_sflash_cmd(cc,
++ BCMA_CC_FLASHCTL_ST_CSA |
++ *buf++);
++ }
++ written++;
++ offset++;
++ len--;
++ }
++ /* All done, drop cs & poll */
++ bcma_cc_write32(cc, BCMA_CC_FLASHCTL, 0);
++ udelay(1);
++ if (!bcma_sflash_poll(dev, offset)) {
++ /* Flash rejected command */
++ return -EAGAIN;
++ }
++ return written;
++}
++
++static int sflash_at_write(struct bcm47xxsflash *dev, u32 offset, u32 len,
++ const u8 *buf)
++{
++ struct bcma_drv_cc *cc = dev->bcc;
++ u32 page, byte, mask;
++ int ret = 0;
++
++ mask = dev->blocksize - 1;
++ page = (offset & ~mask) << 1;
++ byte = offset & mask;
++ /* Read main memory page into buffer 1 */
++ if (byte || (len < dev->blocksize)) {
++ int i = 100;
++ bcma_cc_write32(cc, BCMA_CC_FLASHADDR, page);
++ bcma_sflash_cmd(cc, BCMA_CC_FLASHCTL_AT_BUF1_LOAD);
++ /* 250 us for AT45DB321B */
++ while (i > 0 && bcma_sflash_poll(dev, offset)) {
++ udelay(10);
++ i--;
++ }
++ BUG_ON(!bcma_sflash_poll(dev, offset));
++ }
++ /* Write into buffer 1 */
++ for (ret = 0; (ret < (int)len) && (byte < dev->blocksize); ret++) {
++ bcma_sflash_write_u8(cc, byte++, *buf++);
++ bcma_sflash_cmd(cc, BCMA_CC_FLASHCTL_AT_BUF1_WRITE);
++ }
++ /* Write buffer 1 into main memory page */
++ bcma_cc_write32(cc, BCMA_CC_FLASHADDR, page);
++ bcma_sflash_cmd(cc, BCMA_CC_FLASHCTL_AT_BUF1_PROGRAM);
++
++ return ret;
++}
++
++/* Write len bytes starting at offset into buf. Returns number of bytes
++ * written. Caller should poll for completion.
++ */
++static int bcma_sflash_write(struct bcm47xxsflash *dev, u32 offset, u32 len,
++ const u8 *buf)
++{
++ int ret = 0, tries = NUM_RETRIES;
++ struct bcma_drv_cc *cc = dev->bcc;
++
++ if (!len)
++ return 0;
++
++ if ((offset + len) > cc->sflash.size)
++ return -EINVAL;
++
++ switch (cc->capabilities & BCMA_CC_CAP_FLASHT) {
++ case BCMA_CC_FLASHT_STSER:
++ do {
++ ret = sflash_st_write(dev, offset, len, buf);
++ tries--;
++ } while (ret == -EAGAIN && tries > 0);
++
++ if (ret == -EAGAIN && tries == 0) {
++ bcma_info(cc->core->bus, "ST Flash rejected write\n");
++ ret = -EIO;
++ }
++ break;
++ case BCMA_CC_FLASHT_ATSER:
++ ret = sflash_at_write(dev, offset, len, buf);
++ break;
++ }
++
++ return ret;
++}
++
++/* Erase a region. Returns number of bytes scheduled for erasure.
++ * Caller should poll for completion.
++ */
++static int bcma_sflash_erase(struct bcm47xxsflash *dev, u32 offset)
++{
++ struct bcma_drv_cc *cc = dev->bcc;
++
++ if (offset >= cc->sflash.size)
++ return -EINVAL;
++
++ switch (cc->capabilities & BCMA_CC_CAP_FLASHT) {
++ case BCMA_CC_FLASHT_STSER:
++ bcma_sflash_cmd(cc, BCMA_CC_FLASHCTL_ST_WREN);
++ bcma_cc_write32(cc, BCMA_CC_FLASHADDR, offset);
++ /* Newer flashes have "sub-sectors" which can be erased independently
++ * with a new command: ST_SSE. The ST_SE command erases 64KB just as
++ * before.
++ */
++ if (dev->blocksize < (64 * 1024))
++ bcma_sflash_cmd(cc, BCMA_CC_FLASHCTL_ST_SSE);
++ else
++ bcma_sflash_cmd(cc, BCMA_CC_FLASHCTL_ST_SE);
++ return dev->blocksize;
++ case BCMA_CC_FLASHT_ATSER:
++ bcma_cc_write32(cc, BCMA_CC_FLASHADDR, offset << 1);
++ bcma_sflash_cmd(cc, BCMA_CC_FLASHCTL_AT_PAGE_ERASE);
++ return dev->blocksize;
++ }
++
++ return 0;
++}
++
+ /* Initialize serial flash access */
+ int bcma_sflash_init(struct bcma_drv_cc *cc)
+ {
+ struct bcma_bus *bus = cc->core->bus;
+- struct bcma_sflash *sflash = &cc->sflash;
+- struct bcma_sflash_tbl_e *e;
++ struct bcm47xxsflash *sflash = &cc->sflash;
++ const struct bcma_sflash_tbl_e *e;
+ u32 id, id2;
+
+ switch (cc->capabilities & BCMA_CC_CAP_FLASHT) {
+@@ -150,6 +331,11 @@ int bcma_sflash_init(struct bcma_drv_cc
+ sflash->numblocks = e->numblocks;
+ sflash->size = sflash->blocksize * sflash->numblocks;
+ sflash->present = true;
++ sflash->poll = bcma_sflash_poll;
++ sflash->write = bcma_sflash_write;
++ sflash->erase = bcma_sflash_erase;
++ sflash->type = BCM47XX_SFLASH_BCMA;
++ sflash->bcc = cc;
+
+ bcma_info(bus, "Found %s serial flash (size: %dKiB, blocksize: 0x%X, blocks: %d)\n",
+ e->name, sflash->size / 1024, sflash->blocksize,
+--- a/include/linux/bcma/bcma_driver_chipcommon.h
++++ b/include/linux/bcma/bcma_driver_chipcommon.h
+@@ -3,6 +3,7 @@
+
+ #include <linux/platform_device.h>
+ #include <linux/gpio.h>
++#include <linux/mtd/bcm47xxsflash.h>
+
+ /** ChipCommon core registers. **/
+ #define BCMA_CC_ID 0x0000
+@@ -523,19 +524,6 @@ struct bcma_pflash {
+ u32 window_size;
+ };
+
+-#ifdef CONFIG_BCMA_SFLASH
+-struct bcma_sflash {
+- bool present;
+- u32 window;
+- u32 blocksize;
+- u16 numblocks;
+- u32 size;
+-
+- struct mtd_info *mtd;
+- void *priv;
+-};
+-#endif
+-
+ #ifdef CONFIG_BCMA_NFLASH
+ struct mtd_info;
+
+@@ -569,7 +557,7 @@ struct bcma_drv_cc {
+ #ifdef CONFIG_BCMA_DRIVER_MIPS
+ struct bcma_pflash pflash;
+ #ifdef CONFIG_BCMA_SFLASH
+- struct bcma_sflash sflash;
++ struct bcm47xxsflash sflash;
+ #endif
+ #ifdef CONFIG_BCMA_NFLASH
+ struct bcma_nflash nflash;
generated by cgit v1.2.3 (git 2.25.1) at 2024-11-12 03:21:58 +0000