--- 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 + * Copyright 2011, 2012, Hauke Mehrtens + * Copyright 2010, Broadcom Corporation * * Licensed under the GNU/GPL. See COPYING for details. */ +#include +#include #include +#include #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 + /** 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)