openwrt-xburst/target/linux/brcm47xx/patches-3.6/071-bcma-add-functions-to-write-to-nand-flash.patch

--- a/drivers/bcma/driver_chipcommon_nflash.c
+++ b/drivers/bcma/driver_chipcommon_nflash.c
@@ -2,16 +2,23 @@
  * Broadcom specific AMBA
  * ChipCommon NAND flash interface
  *
+ * Copyright 2011, Tathagata Das <tathagata@alumnux.com>
+ * Copyright 2010, Broadcom Corporation
+ *
  * Licensed under the GNU/GPL. See COPYING for details.
  */
 
+#include <linux/delay.h>
+#include <linux/mtd/bcm47xx_nand.h>
+#include <linux/mtd/nand.h>
 #include <linux/platform_device.h>
 #include <linux/bcma/bcma.h>
+#include <linux/bcma/bcma_driver_chipcommon.h>
 
 #include "bcma_private.h"
 
 struct platform_device bcma_nflash_dev = {
-	.name		= "bcma_nflash",
+	.name		= "bcm47xx-nflash",
 	.num_resources	= 0,
 };
 
@@ -31,6 +38,11 @@ int bcma_nflash_init(struct bcma_drv_cc
 		return -ENODEV;
 	}
 
+	if (bus->chipinfo.id == BCMA_CHIP_ID_BCM4706) {
+		bcma_err(bus, "NAND flash support for BCM4706 not implemented\n");
+		return -ENOTSUPP;
+	}
+
 	cc->nflash.present = true;
 	if (cc->core->id.rev == 38 &&
 	    (cc->status & BCMA_CC_CHIPST_5357_NAND_BOOT))
@@ -42,3 +54,141 @@ int bcma_nflash_init(struct bcma_drv_cc
 
 	return 0;
 }
+
+/* Issue a nand flash command */
+static inline void bcma_nflash_cmd(struct bcma_drv_cc *cc, u32 opcode)
+{
+	bcma_cc_write32(cc, NAND_CMD_START, opcode);
+	bcma_cc_read32(cc,  NAND_CMD_START);
+}
+
+/* Check offset and length */
+static int bcma_nflash_offset_is_valid(struct bcma_drv_cc *cc, u32 offset, u32 len, u32 mask)
+{
+	if ((offset & mask) != 0 || (len & mask) != 0) {
+		pr_err("%s(): Address is not aligned. offset: %x, len: %x, mask: %x\n", __func__, offset, len, mask);
+		return 1;
+	}
+
+	if ((((offset + len) >> 20) >= cc->nflash.size) &&
+		(((offset + len) & ((1 << 20) - 1)) != 0)) {
+		pr_err("%s(): Address is outside Flash memory region. offset: %x, len: %x, mask: %x\n", __func__, offset, len, mask);
+		return 1;
+	}
+
+	return 0;
+}
+
+#define NF_RETRIES   1000000
+
+/* Poll for command completion. Returns zero when complete. */
+int bcma_nflash_poll(struct bcma_drv_cc *cc)
+{
+	u32 retries = NF_RETRIES;
+	u32 pollmask = NIST_CTRL_READY|NIST_FLASH_READY;
+	u32 mask;
+
+	while (retries--) {
+		mask = bcma_cc_read32(cc, NAND_INTFC_STATUS) & pollmask;
+		if (mask == pollmask)
+			return 0;
+		cpu_relax();
+	}
+
+	if (!retries) {
+		pr_err("bcma_nflash_poll: not ready\n");
+		return -1;
+	}
+
+	return 0;
+}
+
+/* Read len bytes starting at offset into buf. Returns number of bytes read. */
+int bcma_nflash_read(struct bcma_drv_cc *cc, u32 offset, u32 len, u8 *buf)
+{
+	u32 mask;
+	int i;
+	u32 *to, val, res;
+
+	mask = NFL_SECTOR_SIZE - 1;
+	if (bcma_nflash_offset_is_valid(cc, offset, len, mask))
+		return 0;
+
+	to = (u32 *)buf;
+	res = len;
+	while (res > 0) {
+		bcma_cc_write32(cc, NAND_CMD_ADDR, offset);
+		bcma_nflash_cmd(cc, NCMD_PAGE_RD);
+		if (bcma_nflash_poll(cc) < 0)
+			break;
+		val = bcma_cc_read32(cc, NAND_INTFC_STATUS);
+		if ((val & NIST_CACHE_VALID) == 0)
+			break;
+		bcma_cc_write32(cc, NAND_CACHE_ADDR, 0);
+		for (i = 0; i < NFL_SECTOR_SIZE; i += 4, to++) {
+			*to = bcma_cc_read32(cc, NAND_CACHE_DATA);
+		}
+		res -= NFL_SECTOR_SIZE;
+		offset += NFL_SECTOR_SIZE;
+	}
+	return (len - res);
+}
+
+/* Write len bytes starting at offset into buf. Returns success (0) or failure (!0).
+ * Should poll for completion.
+ */
+int bcma_nflash_write(struct bcma_drv_cc *cc, u32 offset, u32 len,
+			    const u8 *buf)
+{
+	u32 mask;
+	int i;
+	u32 *from, res, reg;
+
+	mask = cc->nflash.pagesize - 1;
+	if (bcma_nflash_offset_is_valid(cc, offset, len, mask))
+		return 1;
+
+	/* disable partial page enable */
+	reg = bcma_cc_read32(cc, NAND_ACC_CONTROL);
+	reg &= ~NAC_PARTIAL_PAGE_EN;
+	bcma_cc_write32(cc, NAND_ACC_CONTROL, reg);
+
+	from = (u32 *)buf;
+	res = len;
+	while (res > 0) {
+		bcma_cc_write32(cc, NAND_CACHE_ADDR, 0);
+		for (i = 0; i < cc->nflash.pagesize; i += 4, from++) {
+			if (i % 512 == 0)
+				bcma_cc_write32(cc, NAND_CMD_ADDR, i);
+			bcma_cc_write32(cc, NAND_CACHE_DATA, *from);
+		}
+		bcma_cc_write32(cc, NAND_CMD_ADDR, offset + cc->nflash.pagesize - 512);
+		bcma_nflash_cmd(cc, NCMD_PAGE_PROG);
+		if (bcma_nflash_poll(cc) < 0)
+			break;
+		res -= cc->nflash.pagesize;
+		offset += cc->nflash.pagesize;
+	}
+
+	if (res <= 0)
+		return 0;
+	else
+		return (len - res);
+}
+
+/* Erase a region. Returns success (0) or failure (-1).
+ * Poll for completion.
+ */
+int bcma_nflash_erase(struct bcma_drv_cc *cc, u32 offset)
+{
+	if ((offset >> 20) >= cc->nflash.size)
+		return -1;
+	if ((offset & (cc->nflash.blocksize - 1)) != 0)
+		return -1;
+
+	bcma_cc_write32(cc, NAND_CMD_ADDR, offset);
+	bcma_nflash_cmd(cc, NCMD_BLOCK_ERASE);
+	if (bcma_nflash_poll(cc) < 0)
+		return -1;
+	return 0;
+}
--- a/include/linux/bcma/bcma_driver_chipcommon.h
+++ b/include/linux/bcma/bcma_driver_chipcommon.h
@@ -2,6 +2,7 @@
 #define LINUX_BCMA_DRIVER_CC_H_
 
 #include <linux/mtd/bcm47xx_sflash.h>
+#include <linux/mtd/bcm47xx_nand.h>
 
 /** ChipCommon core registers. **/
 #define BCMA_CC_ID			0x0000
@@ -519,17 +520,6 @@ struct bcma_pflash {
 };
 
 
-#ifdef CONFIG_BCMA_NFLASH
-struct mtd_info;
-
-struct bcma_nflash {
-	bool present;
-	bool boot;		/* This is the flash the SoC boots from */
-
-	struct mtd_info *mtd;
-};
-#endif
-
 struct bcma_serial_port {
 	void *regs;
 	unsigned long clockspeed;
@@ -555,7 +545,7 @@ struct bcma_drv_cc {
 	struct bcm47xx_sflash sflash;
 #endif
 #ifdef CONFIG_BCMA_NFLASH
-	struct bcma_nflash nflash;
+	struct bcm47xx_nflash nflash;
 #endif
 
 	int nr_serial_ports;
@@ -613,4 +603,13 @@ extern void bcma_chipco_regctl_maskset(s
 				       u32 offset, u32 mask, u32 set);
 extern void bcma_pmu_spuravoid_pllupdate(struct bcma_drv_cc *cc, int spuravoid);
 
+#ifdef CONFIG_BCMA_NFLASH
+/* Chipcommon nflash support. */
+int bcma_nflash_read(struct bcma_drv_cc *cc, u32 offset, u32 len, u8 *buf);
+int bcma_nflash_poll(struct bcma_drv_cc *cc);
+int bcma_nflash_write(struct bcma_drv_cc *cc, u32 offset, u32 len, const u8 *buf);
+int bcma_nflash_erase(struct bcma_drv_cc *cc, u32 offset);
+int bcma_nflash_commit(struct bcma_drv_cc *cc, u32 offset, u32 len, const u8 *buf);
+#endif
+
 #endif /* LINUX_BCMA_DRIVER_CC_H_ */