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path: root/target/linux/brcm47xx/patches-3.8/060-ssb-add-serial-flash-driver.patch
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Diffstat (limited to 'target/linux/brcm47xx/patches-3.8/060-ssb-add-serial-flash-driver.patch')
-rw-r--r--target/linux/brcm47xx/patches-3.8/060-ssb-add-serial-flash-driver.patch372
1 files changed, 372 insertions, 0 deletions
diff --git a/target/linux/brcm47xx/patches-3.8/060-ssb-add-serial-flash-driver.patch b/target/linux/brcm47xx/patches-3.8/060-ssb-add-serial-flash-driver.patch
new file mode 100644
index 0000000000..9a9c19417e
--- /dev/null
+++ b/target/linux/brcm47xx/patches-3.8/060-ssb-add-serial-flash-driver.patch
@@ -0,0 +1,372 @@
+--- a/drivers/ssb/Kconfig
++++ b/drivers/ssb/Kconfig
+@@ -139,7 +139,7 @@ config SSB_DRIVER_MIPS
+
+ config SSB_SFLASH
+ bool "SSB serial flash support"
+- depends on SSB_DRIVER_MIPS && BROKEN
++ depends on SSB_DRIVER_MIPS
+ default y
+
+ # Assumption: We are on embedded, if we compile the MIPS core.
+--- a/drivers/ssb/driver_chipcommon_sflash.c
++++ b/drivers/ssb/driver_chipcommon_sflash.c
+@@ -1,14 +1,35 @@
+ /*
+ * Sonics Silicon Backplane
+ * 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.
+ */
+
++#include <linux/platform_device.h>
++#include <linux/delay.h>
+ #include <linux/ssb/ssb.h>
++#include <linux/ssb/ssb_driver_chipcommon.h>
+
+ #include "ssb_private.h"
+
++#define NUM_RETRIES 3
++
++static struct resource ssb_sflash_resource = {
++ .name = "ssb_sflash",
++ .start = SSB_FLASH2,
++ .end = 0,
++ .flags = IORESOURCE_MEM | IORESOURCE_READONLY,
++};
++
++struct platform_device ssb_sflash_dev = {
++ .name = "bcm47xx-sflash",
++ .resource = &ssb_sflash_resource,
++ .num_resources = 1,
++};
++
+ struct ssb_sflash_tbl_e {
+ char *name;
+ u32 id;
+@@ -16,7 +37,7 @@ struct ssb_sflash_tbl_e {
+ u16 numblocks;
+ };
+
+-static struct ssb_sflash_tbl_e ssb_sflash_st_tbl[] = {
++static const struct ssb_sflash_tbl_e ssb_sflash_st_tbl[] = {
+ { "M25P20", 0x11, 0x10000, 4, },
+ { "M25P40", 0x12, 0x10000, 8, },
+
+@@ -27,7 +48,7 @@ static struct ssb_sflash_tbl_e ssb_sflas
+ { 0 },
+ };
+
+-static struct ssb_sflash_tbl_e ssb_sflash_sst_tbl[] = {
++static const struct ssb_sflash_tbl_e ssb_sflash_sst_tbl[] = {
+ { "SST25WF512", 1, 0x1000, 16, },
+ { "SST25VF512", 0x48, 0x1000, 16, },
+ { "SST25WF010", 2, 0x1000, 32, },
+@@ -45,7 +66,7 @@ static struct ssb_sflash_tbl_e ssb_sflas
+ { 0 },
+ };
+
+-static struct ssb_sflash_tbl_e ssb_sflash_at_tbl[] = {
++static const struct ssb_sflash_tbl_e ssb_sflash_at_tbl[] = {
+ { "AT45DB011", 0xc, 256, 512, },
+ { "AT45DB021", 0x14, 256, 1024, },
+ { "AT45DB041", 0x1c, 256, 2048, },
+@@ -70,10 +91,186 @@ static void ssb_sflash_cmd(struct ssb_ch
+ pr_err("SFLASH control command failed (timeout)!\n");
+ }
+
++static void ssb_sflash_write_u8(struct ssb_chipcommon *chipco, u32 offset, u8 byte)
++{
++ chipco_write32(chipco, SSB_CHIPCO_FLASHADDR, offset);
++ chipco_write32(chipco, SSB_CHIPCO_FLASHDATA, byte);
++}
++
++/* Poll for command completion. Returns zero when complete. */
++static int ssb_sflash_poll(struct bcm47xxsflash *dev, u32 offset)
++{
++ struct ssb_chipcommon *chipco = dev->scc;
++
++ if (offset >= chipco->sflash.size)
++ return -22;
++
++ switch (chipco->capabilities & SSB_CHIPCO_CAP_FLASHT) {
++ case SSB_CHIPCO_FLASHT_STSER:
++ /* Check for ST Write In Progress bit */
++ ssb_sflash_cmd(chipco, SSB_CHIPCO_FLASHCTL_ST_RDSR);
++ return chipco_read32(chipco, SSB_CHIPCO_FLASHDATA)
++ & SSB_CHIPCO_FLASHDATA_ST_WIP;
++ case SSB_CHIPCO_FLASHT_ATSER:
++ /* Check for Atmel Ready bit */
++ ssb_sflash_cmd(chipco, SSB_CHIPCO_FLASHCTL_AT_STATUS);
++ return !(chipco_read32(chipco, SSB_CHIPCO_FLASHDATA)
++ & SSB_CHIPCO_FLASHDATA_AT_READY);
++ }
++
++ return 0;
++}
++
++
++static int sflash_st_write(struct bcm47xxsflash *dev, u32 offset, u32 len,
++ const u8 *buf)
++{
++ int written = 1;
++ struct ssb_chipcommon *chipco = dev->scc;
++
++ /* Enable writes */
++ ssb_sflash_cmd(chipco, SSB_CHIPCO_FLASHCTL_ST_WREN);
++ ssb_sflash_write_u8(chipco, offset, *buf++);
++ /* Issue a page program with CSA bit set */
++ ssb_sflash_cmd(chipco, SSB_CHIPCO_FLASHCTL_ST_CSA | SSB_CHIPCO_FLASHCTL_ST_PP);
++ offset++;
++ len--;
++ while (len > 0) {
++ if ((offset & 255) == 0) {
++ /* Page boundary, poll droping cs and return */
++ chipco_write32(chipco, SSB_CHIPCO_FLASHCTL, 0);
++ udelay(1);
++ if (!ssb_sflash_poll(dev, offset)) {
++ /* Flash rejected command */
++ return -EAGAIN;
++ }
++ return written;
++ } else {
++ /* Write single byte */
++ ssb_sflash_cmd(chipco,
++ SSB_CHIPCO_FLASHCTL_ST_CSA |
++ *buf++);
++ }
++ written++;
++ offset++;
++ len--;
++ }
++ /* All done, drop cs & poll */
++ chipco_write32(chipco, SSB_CHIPCO_FLASHCTL, 0);
++ udelay(1);
++ if (!ssb_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 ssb_chipcommon *chipco = dev->scc;
++ 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;
++ chipco_write32(chipco, SSB_CHIPCO_FLASHADDR, page);
++ ssb_sflash_cmd(chipco, SSB_CHIPCO_FLASHCTL_AT_BUF1_LOAD);
++ /* 250 us for AT45DB321B */
++ while (i > 0 && ssb_sflash_poll(dev, offset)) {
++ udelay(10);
++ i--;
++ }
++ BUG_ON(!ssb_sflash_poll(dev, offset));
++ }
++ /* Write into buffer 1 */
++ for (ret = 0; (ret < (int)len) && (byte < dev->blocksize); ret++) {
++ ssb_sflash_write_u8(chipco, byte++, *buf++);
++ ssb_sflash_cmd(chipco, SSB_CHIPCO_FLASHCTL_AT_BUF1_WRITE);
++ }
++ /* Write buffer 1 into main memory page */
++ chipco_write32(chipco, SSB_CHIPCO_FLASHADDR, page);
++ ssb_sflash_cmd(chipco, SSB_CHIPCO_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 ssb_sflash_write(struct bcm47xxsflash *dev, u32 offset, u32 len,
++ const u8 *buf)
++{
++ int ret = 0, tries = NUM_RETRIES;
++ struct ssb_chipcommon *chipco = dev->scc;
++
++ if (!len)
++ return 0;
++
++ if ((offset + len) > chipco->sflash.size)
++ return -EINVAL;
++
++ switch (chipco->capabilities & SSB_CHIPCO_CAP_FLASHT) {
++ case SSB_CHIPCO_FLASHT_STSER:
++ do {
++ ret = sflash_st_write(dev, offset, len, buf);
++ tries--;
++ } while (ret == -EAGAIN && tries > 0);
++
++ if (ret == -EAGAIN && tries == 0) {
++ pr_info("ST Flash rejected write\n");
++ ret = -EIO;
++ }
++ break;
++ case SSB_CHIPCO_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 ssb_sflash_erase(struct bcm47xxsflash *dev, u32 offset)
++{
++ struct ssb_chipcommon *chipco = dev->scc;
++
++ if (offset >= chipco->sflash.size)
++ return -EINVAL;
++
++ switch (chipco->capabilities & SSB_CHIPCO_CAP_FLASHT) {
++ case SSB_CHIPCO_FLASHT_STSER:
++ ssb_sflash_cmd(chipco, SSB_CHIPCO_FLASHCTL_ST_WREN);
++ chipco_write32(chipco, SSB_CHIPCO_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))
++ ssb_sflash_cmd(chipco, SSB_CHIPCO_FLASHCTL_ST_SSE);
++ else
++ ssb_sflash_cmd(chipco, SSB_CHIPCO_FLASHCTL_ST_SE);
++ return dev->blocksize;
++ case SSB_CHIPCO_FLASHT_ATSER:
++ chipco_write32(chipco, SSB_CHIPCO_FLASHADDR, offset << 1);
++ ssb_sflash_cmd(chipco, SSB_CHIPCO_FLASHCTL_AT_PAGE_ERASE);
++ return dev->blocksize;
++ }
++
++ return 0;
++}
++
+ /* Initialize serial flash access */
+ int ssb_sflash_init(struct ssb_chipcommon *cc)
+ {
+- struct ssb_sflash_tbl_e *e;
++ struct bcm47xxsflash *sflash = &cc->sflash;
++ const struct ssb_sflash_tbl_e *e;
+ u32 id, id2;
+
+ switch (cc->capabilities & SSB_CHIPCO_CAP_FLASHT) {
+@@ -131,10 +328,26 @@ int ssb_sflash_init(struct ssb_chipcommo
+ return -ENOTSUPP;
+ }
+
+- pr_info("Found %s serial flash (blocksize: 0x%X, blocks: %d)\n",
+- e->name, e->blocksize, e->numblocks);
+-
+- pr_err("Serial flash support is not implemented yet!\n");
++ sflash->window = SSB_FLASH2;
++ sflash->blocksize = e->blocksize;
++ sflash->numblocks = e->numblocks;
++ sflash->size = sflash->blocksize * sflash->numblocks;
++ sflash->present = true;
++ sflash->poll = ssb_sflash_poll;
++ sflash->write = ssb_sflash_write;
++ sflash->erase = ssb_sflash_erase;
++ sflash->type = BCM47XX_SFLASH_SSB;
++ sflash->scc = cc;
++
++ pr_info("Found %s serial flash (size: %dKiB, blocksize: 0x%X, blocks: %d)\n",
++ e->name, sflash->size / 1024, sflash->blocksize,
++ sflash->numblocks);
++
++ /* Prepare platform device, but don't register it yet. It's too early,
++ * malloc (required by device_private_init) is not available yet. */
++ ssb_sflash_dev.resource[0].end = ssb_sflash_dev.resource[0].start +
++ sflash->size;
++ ssb_sflash_dev.dev.platform_data = sflash;
+
+- return -ENOTSUPP;
++ return 0;
+ }
+--- a/drivers/ssb/main.c
++++ b/drivers/ssb/main.c
+@@ -549,6 +549,15 @@ static int ssb_devices_register(struct s
+ dev_idx++;
+ }
+
++#ifdef CONFIG_SSB_SFLASH
++ if (bus->chipco.sflash.present) {
++ err = platform_device_register(&ssb_sflash_dev);
++ if (err)
++ ssb_printk(KERN_ERR PFX
++ "Error registering serial flash\n");
++ }
++#endif
++
+ #ifdef CONFIG_SSB_DRIVER_MIPS
+ if (bus->mipscore.pflash.present) {
+ err = platform_device_register(&ssb_pflash_dev);
+--- a/drivers/ssb/ssb_private.h
++++ b/drivers/ssb/ssb_private.h
+@@ -220,6 +220,7 @@ extern u32 ssb_chipco_watchdog_timer_set
+ /* driver_chipcommon_sflash.c */
+ #ifdef CONFIG_SSB_SFLASH
+ int ssb_sflash_init(struct ssb_chipcommon *cc);
++extern struct platform_device ssb_sflash_dev;
+ #else
+ static inline int ssb_sflash_init(struct ssb_chipcommon *cc)
+ {
+--- a/include/linux/ssb/ssb_driver_chipcommon.h
++++ b/include/linux/ssb/ssb_driver_chipcommon.h
+@@ -13,6 +13,8 @@
+ * Licensed under the GPL version 2. See COPYING for details.
+ */
+
++#include <linux/mtd/bcm47xxsflash.h>
++
+ /** ChipCommon core registers. **/
+
+ #define SSB_CHIPCO_CHIPID 0x0000
+@@ -121,6 +123,17 @@
+ #define SSB_CHIPCO_FLASHCTL_BUSY SSB_CHIPCO_FLASHCTL_START
+ #define SSB_CHIPCO_FLASHADDR 0x0044
+ #define SSB_CHIPCO_FLASHDATA 0x0048
++/* Status register bits for ST flashes */
++#define SSB_CHIPCO_FLASHDATA_ST_WIP 0x01 /* Write In Progress */
++#define SSB_CHIPCO_FLASHDATA_ST_WEL 0x02 /* Write Enable Latch */
++#define SSB_CHIPCO_FLASHDATA_ST_BP_MASK 0x1c /* Block Protect */
++#define SSB_CHIPCO_FLASHDATA_ST_BP_SHIFT 2
++#define SSB_CHIPCO_FLASHDATA_ST_SRWD 0x80 /* Status Register Write Disable */
++/* Status register bits for Atmel flashes */
++#define SSB_CHIPCO_FLASHDATA_AT_READY 0x80
++#define SSB_CHIPCO_FLASHDATA_AT_MISMATCH 0x40
++#define SSB_CHIPCO_FLASHDATA_AT_ID_MASK 0x38
++#define SSB_CHIPCO_FLASHDATA_AT_ID_SHIFT 3
+ #define SSB_CHIPCO_BCAST_ADDR 0x0050
+ #define SSB_CHIPCO_BCAST_DATA 0x0054
+ #define SSB_CHIPCO_GPIOPULLUP 0x0058 /* Rev >= 20 only */
+@@ -503,7 +516,7 @@
+ #define SSB_CHIPCO_FLASHCTL_ST_PP 0x0302 /* Page Program */
+ #define SSB_CHIPCO_FLASHCTL_ST_SE 0x02D8 /* Sector Erase */
+ #define SSB_CHIPCO_FLASHCTL_ST_BE 0x00C7 /* Bulk Erase */
+-#define SSB_CHIPCO_FLASHCTL_ST_DP 0x00B9 /* Deep Power-down */
++#define SSB_CHIPCO_FLASHCTL_ST_DP 0x00D9 /* Deep Power-down */
+ #define SSB_CHIPCO_FLASHCTL_ST_RES 0x03AB /* Read Electronic Signature */
+ #define SSB_CHIPCO_FLASHCTL_ST_CSA 0x1000 /* Keep chip select asserted */
+ #define SSB_CHIPCO_FLASHCTL_ST_SSE 0x0220 /* Sub-sector Erase */
+@@ -594,6 +607,9 @@ struct ssb_chipcommon {
+ struct ssb_chipcommon_pmu pmu;
+ u32 ticks_per_ms;
+ u32 max_timer_ms;
++#ifdef CONFIG_SSB_SFLASH
++ struct bcm47xxsflash sflash;
++#endif
+ };
+
+ static inline bool ssb_chipco_available(struct ssb_chipcommon *cc)
generated by cgit v1.2.3 (git 2.39.1) at 2024-11-08 07:28:57 +0000