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--- 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_ */
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