From b5be6e3037650ff5615cb869f1972dea5a49bcb6 Mon Sep 17 00:00:00 2001 From: Hauke Mehrtens Date: Sun, 17 Jul 2011 14:53:07 +0200 Subject: [PATCH 13/22] bcma: add serial flash support to bcma Signed-off-by: Hauke Mehrtens --- drivers/bcma/Kconfig | 5 + drivers/bcma/Makefile | 1 + drivers/bcma/bcma_private.h | 5 + drivers/bcma/driver_chipcommon_sflash.c | 554 +++++++++++++++++++++++++++ drivers/bcma/driver_mips.c | 8 +- include/linux/bcma/bcma_driver_chipcommon.h | 24 ++ 6 files changed, 596 insertions(+), 1 deletions(-) create mode 100644 drivers/bcma/driver_chipcommon_sflash.c --- 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 @@ -38,6 +38,11 @@ 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 +1,554 @@ +/* + * Broadcom SiliconBackplane chipcommon serial flash interface + * + * Copyright 2011, Jonas Gorski + * Copyright 2010, Broadcom Corporation + * + * Licensed under the GNU/GPL. See COPYING for details. + */ + +#include +#include +#include + +#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->flash.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->flash.sflash.blocksize = 64 * 1024; + switch (id) { + case 0x11: + /* ST M25P20 2 Mbit Serial Flash */ + cc->flash.sflash.numblocks = 4; + break; + case 0x12: + /* ST M25P40 4 Mbit Serial Flash */ + cc->flash.sflash.numblocks = 8; + break; + case 0x13: + /* ST M25P80 8 Mbit Serial Flash */ + cc->flash.sflash.numblocks = 16; + break; + case 0x14: + /* ST M25P16 16 Mbit Serial Flash */ + cc->flash.sflash.numblocks = 32; + break; + case 0x15: + /* ST M25P32 32 Mbit Serial Flash */ + cc->flash.sflash.numblocks = 64; + break; + case 0x16: + /* ST M25P64 64 Mbit Serial Flash */ + cc->flash.sflash.numblocks = 128; + break; + case 0x17: + /* ST M25FL128 128 Mbit Serial Flash */ + cc->flash.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->flash.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->flash.sflash.numblocks = 16; + break; + case 2: + /* SST25WF010 1 Mbit Serial Flash */ + case 0x49: + /* SST25VF010 1 Mbit Serial Flash */ + cc->flash.sflash.numblocks = 32; + break; + case 3: + /* SST25WF020 2 Mbit Serial Flash */ + case 0x43: + /* SST25VF020 2 Mbit Serial Flash */ + cc->flash.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->flash.sflash.numblocks = 128; + break; + case 5: + /* SST25WF080 8 Mbit Serial Flash */ + case 0x8e: + /* SST25VF080B 8 Mbit Serial Flash */ + cc->flash.sflash.numblocks = 256; + break; + case 0x41: + /* SST25VF016 16 Mbit Serial Flash */ + cc->flash.sflash.numblocks = 512; + break; + case 0x4a: + /* SST25VF032 32 Mbit Serial Flash */ + cc->flash.sflash.numblocks = 1024; + break; + case 0x4b: + /* SST25VF064 64 Mbit Serial Flash */ + cc->flash.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->flash.sflash.blocksize = 256; + cc->flash.sflash.numblocks = 512; + break; + case 0x14: + /* Atmel AT45DB021 2Mbit Serial Flash */ + cc->flash.sflash.blocksize = 256; + cc->flash.sflash.numblocks = 1024; + break; + case 0x1c: + /* Atmel AT45DB041 4Mbit Serial Flash */ + cc->flash.sflash.blocksize = 256; + cc->flash.sflash.numblocks = 2048; + break; + case 0x24: + /* Atmel AT45DB081 8Mbit Serial Flash */ + cc->flash.sflash.blocksize = 256; + cc->flash.sflash.numblocks = 4096; + break; + case 0x2c: + /* Atmel AT45DB161 16Mbit Serial Flash */ + cc->flash.sflash.blocksize = 512; + cc->flash.sflash.numblocks = 4096; + break; + case 0x34: + /* Atmel AT45DB321 32Mbit Serial Flash */ + cc->flash.sflash.blocksize = 512; + cc->flash.sflash.numblocks = 8192; + break; + case 0x3c: + /* Atmel AT45DB642 64Mbit Serial Flash */ + cc->flash.sflash.blocksize = 1024; + cc->flash.sflash.numblocks = 8192; + break; + } + break; + } + + cc->flash.sflash.size = cc->flash.sflash.blocksize * cc->flash.sflash.numblocks; + + return cc->flash.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->flash.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; + + + if (cc->core->id.rev == 12) + from = (u8 *)KSEG1ADDR(BCMA_FLASH2 + offset); + else + 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->flash.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) +{ + struct bcma_bus *bus = cc->core->bus; + int ret = 0; + bool is4712b0 = (bus->chipinfo.id == 0x4712) && (bus->chipinfo.rev == 3); + u32 mask; + + + /* Enable writes */ + bcma_sflash_cmd(cc, BCMA_CC_FLASHCTL_ST_WREN); + if (is4712b0) { + mask = 1 << 14; + bcma_sflash_write_u8(cc, offset, *buf++); + /* Set chip select */ + bcma_cc_set32(cc, BCMA_CC_GPIOOUT, mask); + /* Issue a page program with the first byte */ + bcma_sflash_cmd(cc, BCMA_CC_FLASHCTL_ST_PP); + ret = 1; + offset++; + len--; + while (len > 0) { + if ((offset & 255) == 0) { + /* Page boundary, drop cs and return */ + bcma_cc_mask32(cc, BCMA_CC_GPIOOUT, ~mask); + udelay(1); + if (!bcma_sflash_poll(cc, offset)) { + /* Flash rejected command */ + return -EAGAIN; + } + return ret; + } else { + /* Write single byte */ + bcma_sflash_cmd(cc, *buf++); + } + ret++; + offset++; + len--; + } + /* All done, drop cs */ + bcma_cc_mask32(cc, BCMA_CC_GPIOOUT, ~mask); + udelay(1); + if (!bcma_sflash_poll(cc, offset)) { + /* Flash rejected command */ + return -EAGAIN; + } + } else if (cc->core->id.rev >= 20) { + 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); + ret = 1; + 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 ret; + } else { + /* Write single byte */ + bcma_sflash_cmd(cc, + BCMA_CC_FLASHCTL_ST_CSA | + *buf++); + } + ret++; + 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; + } + } else { + ret = 1; + bcma_sflash_write_u8(cc, offset, *buf); + /* Page program */ + bcma_sflash_cmd(cc, BCMA_CC_FLASHCTL_ST_PP); + } + return ret; +} + +static int sflash_at_write(struct bcma_drv_cc *cc, u32 offset, u32 len, + const u8 *buf) +{ + struct bcma_sflash *sfl = &cc->flash.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->flash.sflash.size) + return -EINVAL; + + sfl = &cc->flash.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) { + pr_info("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->flash.sflash.size) + return -EINVAL; + + sfl = &cc->flash.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. + */ + bcma_sflash_cmd(cc, (sfl->blocksize < (64 * 1024)) ? BCMA_CC_FLASHCTL_ST_SSE : 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; +} + +/* + * writes the appropriate range of flash, a NULL buf simply erases + * the region of flash + */ +int bcma_sflash_commit(struct bcma_drv_cc *cc, u32 offset, u32 len, + const u8 *buf) +{ + struct bcma_sflash *sfl; + u8 *block = NULL, *cur_ptr, *blk_ptr; + u32 blocksize = 0, mask, cur_offset, cur_length, cur_retlen, remainder; + u32 blk_offset, blk_len, copied; + int bytes, ret = 0; + + /* Check address range */ + if (len <= 0) + return 0; + + sfl = &cc->flash.sflash; + if ((offset + len) > sfl->size) + return -EINVAL; + + blocksize = sfl->blocksize; + mask = blocksize - 1; + + /* Allocate a block of mem */ + block = kmalloc(blocksize, GFP_KERNEL); + if (!block) + return -ENOMEM; + + while (len) { + /* Align offset */ + cur_offset = offset & ~mask; + cur_length = blocksize; + cur_ptr = block; + + remainder = blocksize - (offset & mask); + if (len < remainder) + cur_retlen = len; + else + cur_retlen = remainder; + + /* buf == NULL means erase only */ + if (buf) { + /* Copy existing data into holding block if necessary */ + if ((offset & mask) || (len < blocksize)) { + blk_offset = cur_offset; + blk_len = cur_length; + blk_ptr = cur_ptr; + + /* Copy entire block */ + while (blk_len) { + copied = bcma_sflash_read(cc, + blk_offset, + blk_len, blk_ptr); + blk_offset += copied; + blk_len -= copied; + blk_ptr += copied; + } + } + + /* Copy input data into holding block */ + memcpy(cur_ptr + (offset & mask), buf, cur_retlen); + } + + /* Erase block */ + ret = bcma_sflash_erase(cc, cur_offset); + if (ret < 0) + goto done; + + while (bcma_sflash_poll(cc, cur_offset)); + + /* buf == NULL means erase only */ + if (!buf) { + offset += cur_retlen; + len -= cur_retlen; + continue; + } + + /* Write holding block */ + while (cur_length > 0) { + bytes = bcma_sflash_write(cc, cur_offset, + cur_length, cur_ptr); + + if (bytes < 0) { + ret = bytes; + goto done; + } + + while (bcma_sflash_poll(cc, cur_offset)); + + cur_offset += bytes; + cur_length -= bytes; + cur_ptr += bytes; + } + + offset += cur_retlen; + len -= cur_retlen; + buf += cur_retlen; + } + + ret = len; +done: + kfree(block); + return ret; +} --- 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: - pr_err("Serial flash not supported.\n"); +#ifdef CONFIG_BCMA_SFLASH + pr_info("found serial flash.\n"); + bus->drv_cc.flash_type = BCMA_SFLASH; + bcma_sflash_init(&bus->drv_cc); +#else + pr_info("serial flash not supported.\n"); +#endif /* CONFIG_BCMA_SFLASH */ break; case BCMA_CC_FLASHT_PARA: pr_info("found parallel flash.\n"); --- a/include/linux/bcma/bcma_driver_chipcommon.h +++ b/include/linux/bcma/bcma_driver_chipcommon.h @@ -358,6 +358,7 @@ struct bcma_chipcommon_pmu { #ifdef CONFIG_BCMA_DRIVER_MIPS enum bcma_flash_type { BCMA_PFLASH, + BCMA_SFLASH, }; struct bcma_pflash { @@ -366,8 +367,19 @@ 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 */ + union bcma_flash { struct bcma_pflash pflash; +#ifdef CONFIG_BCMA_SFLASH + struct bcma_sflash sflash; +#endif /* CONFIG_BCMA_SFLASH */ }; struct bcma_serial_port { @@ -433,4 +445,16 @@ u32 bcma_chipco_gpio_polarity(struct bcm /* PMU support */ extern void bcma_pmu_init(struct bcma_drv_cc *cc); +#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); +int bcma_sflash_commit(struct bcma_drv_cc *cc, u32 offset, u32 len, + const u8 *buf); +#endif /* CONFIG_BCMA_SFLASH */ + #endif /* LINUX_BCMA_DRIVER_CC_H_ */