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wifipineapple-openwrt/target/linux/brcm47xx/patches-3.3/021-bcma-add-serial-flash-s...

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--- a/drivers/bcma/Kconfig
+++ b/drivers/bcma/Kconfig
@@ -38,6 +38,11 @@ config BCMA_HOST_SOC
bool
depends on BCMA_DRIVER_MIPS
+config BCMA_SFLASH
+ bool
+ depends on BCMA_DRIVER_MIPS
+ default y
+
config BCMA_DRIVER_MIPS
bool "BCMA Broadcom MIPS core driver"
depends on BCMA && MIPS
--- a/drivers/bcma/Makefile
+++ b/drivers/bcma/Makefile
@@ -1,5 +1,6 @@
bcma-y += main.o scan.o core.o sprom.o
bcma-y += driver_chipcommon.o driver_chipcommon_pmu.o
+bcma-$(CONFIG_BCMA_SFLASH) += driver_chipcommon_sflash.o
bcma-y += driver_pci.o
bcma-$(CONFIG_BCMA_DRIVER_PCI_HOSTMODE) += driver_pci_host.o
bcma-$(CONFIG_BCMA_DRIVER_MIPS) += driver_mips.o
--- a/drivers/bcma/bcma_private.h
+++ b/drivers/bcma/bcma_private.h
@@ -51,6 +51,11 @@ void bcma_chipco_serial_init(struct bcma
u32 bcma_pmu_alp_clock(struct bcma_drv_cc *cc);
u32 bcma_pmu_get_clockcpu(struct bcma_drv_cc *cc);
+#ifdef CONFIG_BCMA_SFLASH
+/* driver_chipcommon_sflash.c */
+int bcma_sflash_init(struct bcma_drv_cc *cc);
+#endif /* CONFIG_BCMA_SFLASH */
+
#ifdef CONFIG_BCMA_HOST_PCI
/* host_pci.c */
extern int __init bcma_host_pci_init(void);
--- /dev/null
+++ b/drivers/bcma/driver_chipcommon_sflash.c
@@ -0,0 +1,398 @@
+/*
+ * Broadcom SiliconBackplane 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/bcma/bcma.h>
+#include <linux/bcma/bcma_driver_chipcommon.h>
+#include <linux/delay.h>
+
+#include "bcma_private.h"
+
+#define NUM_RETRIES 3
+
+
+/* Issue a serial flash command */
+static inline void bcma_sflash_cmd(struct bcma_drv_cc *cc, u32 opcode)
+{
+ bcma_cc_write32(cc, BCMA_CC_FLASHCTL,
+ BCMA_CC_FLASHCTL_START | opcode);
+ while (bcma_cc_read32(cc, BCMA_CC_FLASHCTL) & BCMA_CC_FLASHCTL_BUSY)
+ ;
+}
+
+
+static inline void bcma_sflash_write_u8(struct bcma_drv_cc *cc,
+ u32 offset, u8 byte)
+{
+ bcma_cc_write32(cc, BCMA_CC_FLASHADDR, offset);
+ bcma_cc_write32(cc, BCMA_CC_FLASHDATA, byte);
+}
+
+/* Initialize serial flash access */
+int bcma_sflash_init(struct bcma_drv_cc *cc)
+{
+ u32 id, id2;
+
+ memset(&cc->sflash, 0, sizeof(struct bcma_sflash));
+
+ switch (cc->capabilities & BCMA_CC_CAP_FLASHT) {
+ case BCMA_CC_FLASHT_STSER:
+ /* Probe for ST chips */
+ bcma_sflash_cmd(cc, BCMA_CC_FLASHCTL_ST_DP);
+ bcma_cc_write32(cc, BCMA_CC_FLASHADDR, 0);
+ bcma_sflash_cmd(cc, BCMA_CC_FLASHCTL_ST_RES);
+ id = bcma_cc_read32(cc, BCMA_CC_FLASHDATA);
+ cc->sflash.blocksize = 64 * 1024;
+ switch (id) {
+ case 0x11:
+ /* ST M25P20 2 Mbit Serial Flash */
+ cc->sflash.numblocks = 4;
+ break;
+ case 0x12:
+ /* ST M25P40 4 Mbit Serial Flash */
+ cc->sflash.numblocks = 8;
+ break;
+ case 0x13:
+ /* ST M25P80 8 Mbit Serial Flash */
+ cc->sflash.numblocks = 16;
+ break;
+ case 0x14:
+ /* ST M25P16 16 Mbit Serial Flash */
+ cc->sflash.numblocks = 32;
+ break;
+ case 0x15:
+ /* ST M25P32 32 Mbit Serial Flash */
+ cc->sflash.numblocks = 64;
+ break;
+ case 0x16:
+ /* ST M25P64 64 Mbit Serial Flash */
+ cc->sflash.numblocks = 128;
+ break;
+ case 0x17:
+ /* ST M25FL128 128 Mbit Serial Flash */
+ cc->sflash.numblocks = 256;
+ break;
+ case 0xbf:
+ /* All of the following flashes are SST with
+ * 4KB subsectors. Others should be added but
+ * We'll have to revamp the way we identify them
+ * since RES is not eough to disambiguate them.
+ */
+ cc->sflash.blocksize = 4 * 1024;
+ bcma_cc_write32(cc, BCMA_CC_FLASHADDR, 1);
+ bcma_sflash_cmd(cc, BCMA_CC_FLASHCTL_ST_RES);
+ id2 = bcma_cc_read32(cc, BCMA_CC_FLASHDATA);
+ switch (id2) {
+ case 1:
+ /* SST25WF512 512 Kbit Serial Flash */
+ case 0x48:
+ /* SST25VF512 512 Kbit Serial Flash */
+ cc->sflash.numblocks = 16;
+ break;
+ case 2:
+ /* SST25WF010 1 Mbit Serial Flash */
+ case 0x49:
+ /* SST25VF010 1 Mbit Serial Flash */
+ cc->sflash.numblocks = 32;
+ break;
+ case 3:
+ /* SST25WF020 2 Mbit Serial Flash */
+ case 0x43:
+ /* SST25VF020 2 Mbit Serial Flash */
+ cc->sflash.numblocks = 64;
+ break;
+ case 4:
+ /* SST25WF040 4 Mbit Serial Flash */
+ case 0x44:
+ /* SST25VF040 4 Mbit Serial Flash */
+ case 0x8d:
+ /* SST25VF040B 4 Mbit Serial Flash */
+ cc->sflash.numblocks = 128;
+ break;
+ case 5:
+ /* SST25WF080 8 Mbit Serial Flash */
+ case 0x8e:
+ /* SST25VF080B 8 Mbit Serial Flash */
+ cc->sflash.numblocks = 256;
+ break;
+ case 0x41:
+ /* SST25VF016 16 Mbit Serial Flash */
+ cc->sflash.numblocks = 512;
+ break;
+ case 0x4a:
+ /* SST25VF032 32 Mbit Serial Flash */
+ cc->sflash.numblocks = 1024;
+ break;
+ case 0x4b:
+ /* SST25VF064 64 Mbit Serial Flash */
+ cc->sflash.numblocks = 2048;
+ break;
+ }
+ break;
+ }
+ break;
+
+ case BCMA_CC_FLASHT_ATSER:
+ /* Probe for Atmel chips */
+ bcma_sflash_cmd(cc, BCMA_CC_FLASHCTL_AT_STATUS);
+ id = bcma_cc_read32(cc, BCMA_CC_FLASHDATA) & 0x3c;
+ switch (id) {
+ case 0xc:
+ /* Atmel AT45DB011 1Mbit Serial Flash */
+ cc->sflash.blocksize = 256;
+ cc->sflash.numblocks = 512;
+ break;
+ case 0x14:
+ /* Atmel AT45DB021 2Mbit Serial Flash */
+ cc->sflash.blocksize = 256;
+ cc->sflash.numblocks = 1024;
+ break;
+ case 0x1c:
+ /* Atmel AT45DB041 4Mbit Serial Flash */
+ cc->sflash.blocksize = 256;
+ cc->sflash.numblocks = 2048;
+ break;
+ case 0x24:
+ /* Atmel AT45DB081 8Mbit Serial Flash */
+ cc->sflash.blocksize = 256;
+ cc->sflash.numblocks = 4096;
+ break;
+ case 0x2c:
+ /* Atmel AT45DB161 16Mbit Serial Flash */
+ cc->sflash.blocksize = 512;
+ cc->sflash.numblocks = 4096;
+ break;
+ case 0x34:
+ /* Atmel AT45DB321 32Mbit Serial Flash */
+ cc->sflash.blocksize = 512;
+ cc->sflash.numblocks = 8192;
+ break;
+ case 0x3c:
+ /* Atmel AT45DB642 64Mbit Serial Flash */
+ cc->sflash.blocksize = 1024;
+ cc->sflash.numblocks = 8192;
+ break;
+ }
+ break;
+ }
+
+ cc->sflash.size = cc->sflash.blocksize * cc->sflash.numblocks;
+
+ return cc->sflash.size ? 0 : -ENODEV;
+}
+
+/* Read len bytes starting at offset into buf. Returns number of bytes read. */
+int bcma_sflash_read(struct bcma_drv_cc *cc, u32 offset, u32 len, u8 *buf)
+{
+ u8 *from, *to;
+ u32 cnt, i;
+
+ if (!len)
+ return 0;
+
+ if ((offset + len) > cc->sflash.size)
+ return -EINVAL;
+
+ if ((len >= 4) && (offset & 3))
+ cnt = 4 - (offset & 3);
+ else if ((len >= 4) && ((u32)buf & 3))
+ cnt = 4 - ((u32)buf & 3);
+ else
+ cnt = len;
+
+ from = (u8 *)KSEG0ADDR(BCMA_FLASH2 + offset);
+
+ to = (u8 *)buf;
+
+ if (cnt < 4) {
+ for (i = 0; i < cnt; i++) {
+ *to = readb(from);
+ from++;
+ to++;
+ }
+ return cnt;
+ }
+
+ while (cnt >= 4) {
+ *(u32 *)to = readl(from);
+ from += 4;
+ to += 4;
+ cnt -= 4;
+ }
+
+ return len - cnt;
+}
+
+/* Poll for command completion. Returns zero when complete. */
+int bcma_sflash_poll(struct bcma_drv_cc *cc, u32 offset)
+{
+ if (offset >= cc->sflash.size)
+ return -22;
+
+ switch (cc->capabilities & BCMA_CC_CAP_FLASHT) {
+ case BCMA_CC_FLASHT_STSER:
+ /* Check for ST Write In Progress bit */
+ bcma_sflash_cmd(cc, BCMA_CC_FLASHCTL_ST_RDSR);
+ return bcma_cc_read32(cc, BCMA_CC_FLASHDATA)
+ & BCMA_CC_FLASHDATA_ST_WIP;
+ case BCMA_CC_FLASHT_ATSER:
+ /* Check for Atmel Ready bit */
+ bcma_sflash_cmd(cc, BCMA_CC_FLASHCTL_AT_STATUS);
+ return !(bcma_cc_read32(cc, BCMA_CC_FLASHDATA)
+ & BCMA_CC_FLASHDATA_AT_READY);
+ }
+
+ return 0;
+}
+
+
+static int sflash_st_write(struct bcma_drv_cc *cc, u32 offset, u32 len,
+ const u8 *buf)
+{
+ int written = 1;
+
+ /* Enable writes */
+ bcma_sflash_cmd(cc, BCMA_CC_FLASHCTL_ST_WREN);
+ bcma_sflash_write_u8(cc, offset, *buf++);
+ /* Issue a page program with CSA bit set */
+ bcma_sflash_cmd(cc, BCMA_CC_FLASHCTL_ST_CSA | BCMA_CC_FLASHCTL_ST_PP);
+ offset++;
+ len--;
+ while (len > 0) {
+ if ((offset & 255) == 0) {
+ /* Page boundary, poll droping cs and return */
+ bcma_cc_write32(cc, BCMA_CC_FLASHCTL, 0);
+ udelay(1);
+ if (!bcma_sflash_poll(cc, offset)) {
+ /* Flash rejected command */
+ return -EAGAIN;
+ }
+ return written;
+ } else {
+ /* Write single byte */
+ bcma_sflash_cmd(cc,
+ BCMA_CC_FLASHCTL_ST_CSA |
+ *buf++);
+ }
+ written++;
+ offset++;
+ len--;
+ }
+ /* All done, drop cs & poll */
+ bcma_cc_write32(cc, BCMA_CC_FLASHCTL, 0);
+ udelay(1);
+ if (!bcma_sflash_poll(cc, offset)) {
+ /* Flash rejected command */
+ return -EAGAIN;
+ }
+ return written;
+}
+
+static int sflash_at_write(struct bcma_drv_cc *cc, u32 offset, u32 len,
+ const u8 *buf)
+{
+ struct bcma_sflash *sfl = &cc->sflash;
+ u32 page, byte, mask;
+ int ret = 0;
+
+ mask = sfl->blocksize - 1;
+ page = (offset & ~mask) << 1;
+ byte = offset & mask;
+ /* Read main memory page into buffer 1 */
+ if (byte || (len < sfl->blocksize)) {
+ int i = 100;
+ bcma_cc_write32(cc, BCMA_CC_FLASHADDR, page);
+ bcma_sflash_cmd(cc, BCMA_CC_FLASHCTL_AT_BUF1_LOAD);
+ /* 250 us for AT45DB321B */
+ while (i > 0 && bcma_sflash_poll(cc, offset)) {
+ udelay(10);
+ i--;
+ }
+ BUG_ON(!bcma_sflash_poll(cc, offset));
+ }
+ /* Write into buffer 1 */
+ for (ret = 0; (ret < (int)len) && (byte < sfl->blocksize); ret++) {
+ bcma_sflash_write_u8(cc, byte++, *buf++);
+ bcma_sflash_cmd(cc, BCMA_CC_FLASHCTL_AT_BUF1_WRITE);
+ }
+ /* Write buffer 1 into main memory page */
+ bcma_cc_write32(cc, BCMA_CC_FLASHADDR, page);
+ bcma_sflash_cmd(cc, BCMA_CC_FLASHCTL_AT_BUF1_PROGRAM);
+
+ return ret;
+}
+
+/* Write len bytes starting at offset into buf. Returns number of bytes
+ * written. Caller should poll for completion.
+ */
+int bcma_sflash_write(struct bcma_drv_cc *cc, u32 offset, u32 len,
+ const u8 *buf)
+{
+ struct bcma_sflash *sfl;
+ int ret = 0, tries = NUM_RETRIES;
+
+ if (!len)
+ return 0;
+
+ if ((offset + len) > cc->sflash.size)
+ return -EINVAL;
+
+ sfl = &cc->sflash;
+ switch (cc->capabilities & BCMA_CC_CAP_FLASHT) {
+ case BCMA_CC_FLASHT_STSER:
+ do {
+ ret = sflash_st_write(cc, offset, len, buf);
+ tries--;
+ } while (ret == -EAGAIN && tries > 0);
+
+ if (ret == -EAGAIN && tries == 0) {
+ bcma_info(cc->core->bus, "ST Flash rejected write\n");
+ ret = -EIO;
+ }
+ break;
+ case BCMA_CC_FLASHT_ATSER:
+ ret = sflash_at_write(cc, offset, len, buf);
+ break;
+ }
+
+ return ret;
+}
+
+/* Erase a region. Returns number of bytes scheduled for erasure.
+ * Caller should poll for completion.
+ */
+int bcma_sflash_erase(struct bcma_drv_cc *cc, u32 offset)
+{
+ struct bcma_sflash *sfl;
+
+ if (offset >= cc->sflash.size)
+ return -EINVAL;
+
+ sfl = &cc->sflash;
+ switch (cc->capabilities & BCMA_CC_CAP_FLASHT) {
+ case BCMA_CC_FLASHT_STSER:
+ bcma_sflash_cmd(cc, BCMA_CC_FLASHCTL_ST_WREN);
+ bcma_cc_write32(cc, BCMA_CC_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 (sfl->blocksize < (64 * 1024))
+ bcma_sflash_cmd(cc, BCMA_CC_FLASHCTL_ST_SSE);
+ else
+ bcma_sflash_cmd(cc, BCMA_CC_FLASHCTL_ST_SE);
+ return sfl->blocksize;
+ case BCMA_CC_FLASHT_ATSER:
+ bcma_cc_write32(cc, BCMA_CC_FLASHADDR, offset << 1);
+ bcma_sflash_cmd(cc, BCMA_CC_FLASHCTL_AT_PAGE_ERASE);
+ return sfl->blocksize;
+ }
+
+ return 0;
+}
--- a/drivers/bcma/driver_mips.c
+++ b/drivers/bcma/driver_mips.c
@@ -185,7 +185,13 @@ static void bcma_core_mips_flash_detect(
switch (bus->drv_cc.capabilities & BCMA_CC_CAP_FLASHT) {
case BCMA_CC_FLASHT_STSER:
case BCMA_CC_FLASHT_ATSER:
- bcma_err(bus, "Serial flash not supported.\n");
+#ifdef CONFIG_BCMA_SFLASH
+ bcma_info(bus, "found serial flash.\n");
+ bus->drv_cc.flash_type = BCMA_SFLASH;
+ bcma_sflash_init(&bus->drv_cc);
+#else
+ bcma_info(bus, "serial flash not supported.\n");
+#endif /* CONFIG_BCMA_SFLASH */
break;
case BCMA_CC_FLASHT_PARA:
bcma_info(bus, "found parallel flash.\n");
--- a/include/linux/bcma/bcma_driver_chipcommon.h
+++ b/include/linux/bcma/bcma_driver_chipcommon.h
@@ -435,6 +435,7 @@ struct bcma_chipcommon_pmu {
#ifdef CONFIG_BCMA_DRIVER_MIPS
enum bcma_flash_type {
BCMA_PFLASH,
+ BCMA_SFLASH,
};
struct bcma_pflash {
@@ -443,6 +444,14 @@ struct bcma_pflash {
u32 window_size;
};
+#ifdef CONFIG_BCMA_SFLASH
+struct bcma_sflash {
+ u32 blocksize; /* Block size */
+ u32 numblocks; /* Number of blocks */
+ u32 size; /* Total size in bytes */
+};
+#endif /* CONFIG_BCMA_SFLASH */
+
struct bcma_serial_port {
void *regs;
unsigned long clockspeed;
@@ -465,6 +474,9 @@ struct bcma_drv_cc {
enum bcma_flash_type flash_type;
union {
struct bcma_pflash pflash;
+#ifdef CONFIG_BCMA_SFLASH
+ struct bcma_sflash sflash;
+#endif /* CONFIG_BCMA_SFLASH */
};
int nr_serial_ports;
@@ -520,4 +532,14 @@ 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_SFLASH
+/* Chipcommon sflash support. */
+int bcma_sflash_read(struct bcma_drv_cc *cc, u32 offset, u32 len,
+ u8 *buf);
+int bcma_sflash_poll(struct bcma_drv_cc *cc, u32 offset);
+int bcma_sflash_write(struct bcma_drv_cc *cc, u32 offset, u32 len,
+ const u8 *buf);
+int bcma_sflash_erase(struct bcma_drv_cc *cc, u32 offset);
+#endif /* CONFIG_BCMA_SFLASH */
+
#endif /* LINUX_BCMA_DRIVER_CC_H_ */
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