path: root/target/linux/brcm47xx/patches-3.8/060-ssb-add-serial-flash-driver.patch

--- 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
@@ -545,6 +545,15 @@ 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
@@ -231,6 +231,7 @@ 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 */
@@ -504,7 +517,7 @@
 #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 */
@@ -595,6 +608,9 @@ 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)