mirror of
https://github.com/openwrt/openwrt.git
synced 2024-12-30 18:47:06 +00:00
301 lines
8.2 KiB
Diff
301 lines
8.2 KiB
Diff
--- a/drivers/bcma/driver_chipcommon_sflash.c
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+++ b/drivers/bcma/driver_chipcommon_sflash.c
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@@ -1,6 +1,9 @@
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/*
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* Broadcom specific AMBA
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* ChipCommon serial flash interface
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+ * Copyright 2011, Jonas Gorski <jonas.gorski@gmail.com>
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+ * Copyright 2011, 2012, Hauke Mehrtens <hauke@hauke-m.de>
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+ * Copyright 2010, Broadcom Corporation
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*
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* Licensed under the GNU/GPL. See COPYING for details.
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*/
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@@ -8,7 +11,11 @@
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#include "bcma_private.h"
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#include <linux/platform_device.h>
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+#include <linux/delay.h>
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#include <linux/bcma/bcma.h>
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+#include <linux/bcma/bcma_driver_chipcommon.h>
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+
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+#define NUM_RETRIES 3
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static struct resource bcma_sflash_resource = {
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.name = "bcma_sflash",
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@@ -18,7 +25,7 @@ static struct resource bcma_sflash_resou
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};
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struct platform_device bcma_sflash_dev = {
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- .name = "bcma_sflash",
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+ .name = "bcm47xx-sflash",
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.resource = &bcma_sflash_resource,
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.num_resources = 1,
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};
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@@ -30,7 +37,7 @@ struct bcma_sflash_tbl_e {
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u16 numblocks;
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};
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-static struct bcma_sflash_tbl_e bcma_sflash_st_tbl[] = {
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+static const struct bcma_sflash_tbl_e bcma_sflash_st_tbl[] = {
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{ "M25P20", 0x11, 0x10000, 4, },
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{ "M25P40", 0x12, 0x10000, 8, },
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@@ -41,7 +48,7 @@ static struct bcma_sflash_tbl_e bcma_sfl
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{ 0 },
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};
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-static struct bcma_sflash_tbl_e bcma_sflash_sst_tbl[] = {
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+static const struct bcma_sflash_tbl_e bcma_sflash_sst_tbl[] = {
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{ "SST25WF512", 1, 0x1000, 16, },
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{ "SST25VF512", 0x48, 0x1000, 16, },
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{ "SST25WF010", 2, 0x1000, 32, },
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@@ -59,7 +66,7 @@ static struct bcma_sflash_tbl_e bcma_sfl
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{ 0 },
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};
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-static struct bcma_sflash_tbl_e bcma_sflash_at_tbl[] = {
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+static const struct bcma_sflash_tbl_e bcma_sflash_at_tbl[] = {
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{ "AT45DB011", 0xc, 256, 512, },
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{ "AT45DB021", 0x14, 256, 1024, },
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{ "AT45DB041", 0x1c, 256, 2048, },
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@@ -84,12 +91,186 @@ static void bcma_sflash_cmd(struct bcma_
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bcma_err(cc->core->bus, "SFLASH control command failed (timeout)!\n");
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}
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+static void bcma_sflash_write_u8(struct bcma_drv_cc *cc, u32 offset, u8 byte)
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+{
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+ bcma_cc_write32(cc, BCMA_CC_FLASHADDR, offset);
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+ bcma_cc_write32(cc, BCMA_CC_FLASHDATA, byte);
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+}
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+
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+/* Poll for command completion. Returns zero when complete. */
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+static int bcma_sflash_poll(struct bcm47xxsflash *dev, u32 offset)
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+{
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+ struct bcma_drv_cc *cc = dev->bcc;
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+
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+ if (offset >= cc->sflash.size)
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+ return -22;
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+
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+ switch (cc->capabilities & BCMA_CC_CAP_FLASHT) {
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+ case BCMA_CC_FLASHT_STSER:
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+ /* Check for ST Write In Progress bit */
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+ bcma_sflash_cmd(cc, BCMA_CC_FLASHCTL_ST_RDSR);
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+ return bcma_cc_read32(cc, BCMA_CC_FLASHDATA)
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+ & BCMA_CC_FLASHDATA_ST_WIP;
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+ case BCMA_CC_FLASHT_ATSER:
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+ /* Check for Atmel Ready bit */
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+ bcma_sflash_cmd(cc, BCMA_CC_FLASHCTL_AT_STATUS);
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+ return !(bcma_cc_read32(cc, BCMA_CC_FLASHDATA)
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+ & BCMA_CC_FLASHDATA_AT_READY);
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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 sflash_st_write(struct bcm47xxsflash *dev, u32 offset, u32 len,
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+ const u8 *buf)
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+{
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+ int written = 1;
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+ struct bcma_drv_cc *cc = dev->bcc;
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+
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+ /* Enable writes */
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+ bcma_sflash_cmd(cc, BCMA_CC_FLASHCTL_ST_WREN);
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+ bcma_sflash_write_u8(cc, offset, *buf++);
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+ /* Issue a page program with CSA bit set */
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+ bcma_sflash_cmd(cc, BCMA_CC_FLASHCTL_ST_CSA | BCMA_CC_FLASHCTL_ST_PP);
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+ offset++;
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+ len--;
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+ while (len > 0) {
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+ if ((offset & 255) == 0) {
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+ /* Page boundary, poll droping cs and return */
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+ bcma_cc_write32(cc, BCMA_CC_FLASHCTL, 0);
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+ udelay(1);
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+ if (!bcma_sflash_poll(dev, offset)) {
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+ /* Flash rejected command */
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+ return -EAGAIN;
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+ }
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+ return written;
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+ } else {
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+ /* Write single byte */
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+ bcma_sflash_cmd(cc,
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+ BCMA_CC_FLASHCTL_ST_CSA |
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+ *buf++);
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+ }
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+ written++;
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+ offset++;
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+ len--;
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+ }
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+ /* All done, drop cs & poll */
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+ bcma_cc_write32(cc, BCMA_CC_FLASHCTL, 0);
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+ udelay(1);
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+ if (!bcma_sflash_poll(dev, offset)) {
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+ /* Flash rejected command */
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+ return -EAGAIN;
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+ }
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+ return written;
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+}
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+
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+static int sflash_at_write(struct bcm47xxsflash *dev, u32 offset, u32 len,
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+ const u8 *buf)
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+{
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+ struct bcma_drv_cc *cc = dev->bcc;
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+ u32 page, byte, mask;
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+ int ret = 0;
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+
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+ mask = dev->blocksize - 1;
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+ page = (offset & ~mask) << 1;
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+ byte = offset & mask;
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+ /* Read main memory page into buffer 1 */
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+ if (byte || (len < dev->blocksize)) {
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+ int i = 100;
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+ bcma_cc_write32(cc, BCMA_CC_FLASHADDR, page);
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+ bcma_sflash_cmd(cc, BCMA_CC_FLASHCTL_AT_BUF1_LOAD);
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+ /* 250 us for AT45DB321B */
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+ while (i > 0 && bcma_sflash_poll(dev, offset)) {
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+ udelay(10);
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+ i--;
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+ }
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+ BUG_ON(!bcma_sflash_poll(dev, offset));
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+ }
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+ /* Write into buffer 1 */
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+ for (ret = 0; (ret < (int)len) && (byte < dev->blocksize); ret++) {
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+ bcma_sflash_write_u8(cc, byte++, *buf++);
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+ bcma_sflash_cmd(cc, BCMA_CC_FLASHCTL_AT_BUF1_WRITE);
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+ }
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+ /* Write buffer 1 into main memory page */
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+ bcma_cc_write32(cc, BCMA_CC_FLASHADDR, page);
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+ bcma_sflash_cmd(cc, BCMA_CC_FLASHCTL_AT_BUF1_PROGRAM);
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+
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+ return ret;
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+}
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+
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+/* Write len bytes starting at offset into buf. Returns number of bytes
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+ * written. Caller should poll for completion.
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+ */
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+static int bcma_sflash_write(struct bcm47xxsflash *dev, u32 offset, u32 len,
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+ const u8 *buf)
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+{
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+ int ret = 0, tries = NUM_RETRIES;
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+ struct bcma_drv_cc *cc = dev->bcc;
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+
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+ if (!len)
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+ return 0;
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+
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+ if ((offset + len) > cc->sflash.size)
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+ return -EINVAL;
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+
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+ switch (cc->capabilities & BCMA_CC_CAP_FLASHT) {
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+ case BCMA_CC_FLASHT_STSER:
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+ do {
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+ ret = sflash_st_write(dev, offset, len, buf);
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+ tries--;
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+ } while (ret == -EAGAIN && tries > 0);
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+
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+ if (ret == -EAGAIN && tries == 0) {
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+ bcma_info(cc->core->bus, "ST Flash rejected write\n");
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+ ret = -EIO;
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+ }
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+ break;
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+ case BCMA_CC_FLASHT_ATSER:
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+ ret = sflash_at_write(dev, offset, len, buf);
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+ break;
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+ }
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+
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+ return ret;
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+}
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+
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+/* Erase a region. Returns number of bytes scheduled for erasure.
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+ * Caller should poll for completion.
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+ */
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+static int bcma_sflash_erase(struct bcm47xxsflash *dev, u32 offset)
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+{
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+ struct bcma_drv_cc *cc = dev->bcc;
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+
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+ if (offset >= cc->sflash.size)
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+ return -EINVAL;
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+
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+ switch (cc->capabilities & BCMA_CC_CAP_FLASHT) {
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+ case BCMA_CC_FLASHT_STSER:
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+ bcma_sflash_cmd(cc, BCMA_CC_FLASHCTL_ST_WREN);
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+ bcma_cc_write32(cc, BCMA_CC_FLASHADDR, offset);
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+ /* Newer flashes have "sub-sectors" which can be erased independently
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+ * with a new command: ST_SSE. The ST_SE command erases 64KB just as
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+ * before.
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+ */
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+ if (dev->blocksize < (64 * 1024))
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+ bcma_sflash_cmd(cc, BCMA_CC_FLASHCTL_ST_SSE);
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+ else
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+ bcma_sflash_cmd(cc, BCMA_CC_FLASHCTL_ST_SE);
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+ return dev->blocksize;
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+ case BCMA_CC_FLASHT_ATSER:
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+ bcma_cc_write32(cc, BCMA_CC_FLASHADDR, offset << 1);
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+ bcma_sflash_cmd(cc, BCMA_CC_FLASHCTL_AT_PAGE_ERASE);
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+ return dev->blocksize;
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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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/* Initialize serial flash access */
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int bcma_sflash_init(struct bcma_drv_cc *cc)
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{
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struct bcma_bus *bus = cc->core->bus;
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- struct bcma_sflash *sflash = &cc->sflash;
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- struct bcma_sflash_tbl_e *e;
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+ struct bcm47xxsflash *sflash = &cc->sflash;
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+ const struct bcma_sflash_tbl_e *e;
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u32 id, id2;
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switch (cc->capabilities & BCMA_CC_CAP_FLASHT) {
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@@ -150,6 +331,11 @@ int bcma_sflash_init(struct bcma_drv_cc
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sflash->numblocks = e->numblocks;
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sflash->size = sflash->blocksize * sflash->numblocks;
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sflash->present = true;
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+ sflash->poll = bcma_sflash_poll;
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+ sflash->write = bcma_sflash_write;
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+ sflash->erase = bcma_sflash_erase;
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+ sflash->type = BCM47XX_SFLASH_BCMA;
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+ sflash->bcc = cc;
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bcma_info(bus, "Found %s serial flash (size: %dKiB, blocksize: 0x%X, blocks: %d)\n",
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e->name, sflash->size / 1024, sflash->blocksize,
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--- a/include/linux/bcma/bcma_driver_chipcommon.h
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+++ b/include/linux/bcma/bcma_driver_chipcommon.h
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@@ -3,6 +3,7 @@
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#include <linux/platform_device.h>
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#include <linux/gpio.h>
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+#include <linux/mtd/bcm47xxsflash.h>
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/** ChipCommon core registers. **/
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#define BCMA_CC_ID 0x0000
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@@ -523,19 +524,6 @@ struct bcma_pflash {
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u32 window_size;
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};
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-#ifdef CONFIG_BCMA_SFLASH
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-struct bcma_sflash {
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- bool present;
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- u32 window;
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- u32 blocksize;
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- u16 numblocks;
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- u32 size;
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-
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- struct mtd_info *mtd;
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- void *priv;
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-};
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-#endif
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-
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#ifdef CONFIG_BCMA_NFLASH
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struct mtd_info;
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@@ -570,7 +558,7 @@ struct bcma_drv_cc {
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#ifdef CONFIG_BCMA_DRIVER_MIPS
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struct bcma_pflash pflash;
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#ifdef CONFIG_BCMA_SFLASH
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- struct bcma_sflash sflash;
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+ struct bcm47xxsflash sflash;
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#endif
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#ifdef CONFIG_BCMA_NFLASH
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struct bcma_nflash nflash;
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