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382 lines
9.6 KiB
382 lines
9.6 KiB
// SPDX-License-Identifier: GPL-2.0-only |
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#include <linux/kernel.h> |
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#include <linux/module.h> |
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#include <linux/slab.h> |
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#include <linux/delay.h> |
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#include <linux/ioport.h> |
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#include <linux/mtd/mtd.h> |
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#include <linux/platform_device.h> |
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#include <linux/bcma/bcma.h> |
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#include "bcm47xxsflash.h" |
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MODULE_LICENSE("GPL"); |
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MODULE_DESCRIPTION("Serial flash driver for BCMA bus"); |
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static const char * const probes[] = { "bcm47xxpart", NULL }; |
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/************************************************** |
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* Various helpers |
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**************************************************/ |
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static void bcm47xxsflash_cmd(struct bcm47xxsflash *b47s, u32 opcode) |
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{ |
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int i; |
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b47s->cc_write(b47s, BCMA_CC_FLASHCTL, BCMA_CC_FLASHCTL_START | opcode); |
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for (i = 0; i < 1000; i++) { |
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if (!(b47s->cc_read(b47s, BCMA_CC_FLASHCTL) & |
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BCMA_CC_FLASHCTL_BUSY)) |
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return; |
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cpu_relax(); |
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} |
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pr_err("Control command failed (timeout)!\n"); |
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} |
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static int bcm47xxsflash_poll(struct bcm47xxsflash *b47s, int timeout) |
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{ |
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unsigned long deadline = jiffies + timeout; |
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do { |
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switch (b47s->type) { |
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case BCM47XXSFLASH_TYPE_ST: |
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bcm47xxsflash_cmd(b47s, OPCODE_ST_RDSR); |
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if (!(b47s->cc_read(b47s, BCMA_CC_FLASHDATA) & |
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SR_ST_WIP)) |
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return 0; |
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break; |
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case BCM47XXSFLASH_TYPE_ATMEL: |
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bcm47xxsflash_cmd(b47s, OPCODE_AT_STATUS); |
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if (b47s->cc_read(b47s, BCMA_CC_FLASHDATA) & |
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SR_AT_READY) |
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return 0; |
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break; |
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} |
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cpu_relax(); |
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udelay(1); |
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} while (!time_after_eq(jiffies, deadline)); |
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pr_err("Timeout waiting for flash to be ready!\n"); |
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return -EBUSY; |
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} |
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/************************************************** |
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* MTD ops |
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**************************************************/ |
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static int bcm47xxsflash_erase(struct mtd_info *mtd, struct erase_info *erase) |
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{ |
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struct bcm47xxsflash *b47s = mtd->priv; |
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switch (b47s->type) { |
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case BCM47XXSFLASH_TYPE_ST: |
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bcm47xxsflash_cmd(b47s, OPCODE_ST_WREN); |
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b47s->cc_write(b47s, BCMA_CC_FLASHADDR, erase->addr); |
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/* Newer flashes have "sub-sectors" which can be erased |
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* independently with a new command: ST_SSE. The ST_SE command |
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* erases 64KB just as before. |
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*/ |
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if (b47s->blocksize < (64 * 1024)) |
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bcm47xxsflash_cmd(b47s, OPCODE_ST_SSE); |
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else |
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bcm47xxsflash_cmd(b47s, OPCODE_ST_SE); |
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break; |
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case BCM47XXSFLASH_TYPE_ATMEL: |
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b47s->cc_write(b47s, BCMA_CC_FLASHADDR, erase->addr << 1); |
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bcm47xxsflash_cmd(b47s, OPCODE_AT_PAGE_ERASE); |
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break; |
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} |
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return bcm47xxsflash_poll(b47s, HZ); |
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} |
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static int bcm47xxsflash_read(struct mtd_info *mtd, loff_t from, size_t len, |
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size_t *retlen, u_char *buf) |
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{ |
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struct bcm47xxsflash *b47s = mtd->priv; |
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size_t orig_len = len; |
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/* Check address range */ |
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if ((from + len) > mtd->size) |
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return -EINVAL; |
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/* Read as much as possible using fast MMIO window */ |
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if (from < BCM47XXSFLASH_WINDOW_SZ) { |
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size_t memcpy_len; |
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memcpy_len = min(len, (size_t)(BCM47XXSFLASH_WINDOW_SZ - from)); |
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memcpy_fromio(buf, b47s->window + from, memcpy_len); |
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from += memcpy_len; |
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len -= memcpy_len; |
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buf += memcpy_len; |
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} |
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/* Use indirect access for content out of the window */ |
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for (; len; len--) { |
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b47s->cc_write(b47s, BCMA_CC_FLASHADDR, from++); |
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bcm47xxsflash_cmd(b47s, OPCODE_ST_READ4B); |
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*buf++ = b47s->cc_read(b47s, BCMA_CC_FLASHDATA); |
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} |
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*retlen = orig_len; |
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return orig_len; |
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} |
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static int bcm47xxsflash_write_st(struct mtd_info *mtd, u32 offset, size_t len, |
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const u_char *buf) |
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{ |
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struct bcm47xxsflash *b47s = mtd->priv; |
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int written = 0; |
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/* Enable writes */ |
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bcm47xxsflash_cmd(b47s, OPCODE_ST_WREN); |
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/* Write first byte */ |
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b47s->cc_write(b47s, BCMA_CC_FLASHADDR, offset); |
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b47s->cc_write(b47s, BCMA_CC_FLASHDATA, *buf++); |
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/* Program page */ |
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if (b47s->bcma_cc->core->id.rev < 20) { |
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bcm47xxsflash_cmd(b47s, OPCODE_ST_PP); |
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return 1; /* 1B written */ |
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} |
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/* Program page and set CSA (on newer chips we can continue writing) */ |
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bcm47xxsflash_cmd(b47s, OPCODE_ST_CSA | OPCODE_ST_PP); |
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offset++; |
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len--; |
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written++; |
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while (len > 0) { |
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/* Page boundary, another function call is needed */ |
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if ((offset & 0xFF) == 0) |
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break; |
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bcm47xxsflash_cmd(b47s, OPCODE_ST_CSA | *buf++); |
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offset++; |
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len--; |
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written++; |
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} |
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/* All done, drop CSA & poll */ |
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b47s->cc_write(b47s, BCMA_CC_FLASHCTL, 0); |
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udelay(1); |
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if (bcm47xxsflash_poll(b47s, HZ / 10)) |
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pr_err("Flash rejected dropping CSA\n"); |
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return written; |
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} |
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static int bcm47xxsflash_write_at(struct mtd_info *mtd, u32 offset, size_t len, |
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const u_char *buf) |
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{ |
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struct bcm47xxsflash *b47s = mtd->priv; |
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u32 mask = b47s->blocksize - 1; |
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u32 page = (offset & ~mask) << 1; |
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u32 byte = offset & mask; |
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int written = 0; |
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/* If we don't overwrite whole page, read it to the buffer first */ |
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if (byte || (len < b47s->blocksize)) { |
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int err; |
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b47s->cc_write(b47s, BCMA_CC_FLASHADDR, page); |
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bcm47xxsflash_cmd(b47s, OPCODE_AT_BUF1_LOAD); |
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/* 250 us for AT45DB321B */ |
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err = bcm47xxsflash_poll(b47s, HZ / 1000); |
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if (err) { |
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pr_err("Timeout reading page 0x%X info buffer\n", page); |
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return err; |
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} |
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} |
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/* Change buffer content with our data */ |
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while (len > 0) { |
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/* Page boundary, another function call is needed */ |
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if (byte == b47s->blocksize) |
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break; |
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b47s->cc_write(b47s, BCMA_CC_FLASHADDR, byte++); |
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b47s->cc_write(b47s, BCMA_CC_FLASHDATA, *buf++); |
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bcm47xxsflash_cmd(b47s, OPCODE_AT_BUF1_WRITE); |
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len--; |
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written++; |
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} |
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/* Program page with the buffer content */ |
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b47s->cc_write(b47s, BCMA_CC_FLASHADDR, page); |
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bcm47xxsflash_cmd(b47s, OPCODE_AT_BUF1_PROGRAM); |
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return written; |
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} |
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static int bcm47xxsflash_write(struct mtd_info *mtd, loff_t to, size_t len, |
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size_t *retlen, const u_char *buf) |
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{ |
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struct bcm47xxsflash *b47s = mtd->priv; |
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int written; |
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/* Writing functions can return without writing all passed data, for |
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* example when the hardware is too old or when we git page boundary. |
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*/ |
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while (len > 0) { |
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switch (b47s->type) { |
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case BCM47XXSFLASH_TYPE_ST: |
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written = bcm47xxsflash_write_st(mtd, to, len, buf); |
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break; |
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case BCM47XXSFLASH_TYPE_ATMEL: |
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written = bcm47xxsflash_write_at(mtd, to, len, buf); |
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break; |
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default: |
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BUG_ON(1); |
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} |
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if (written < 0) { |
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pr_err("Error writing at offset 0x%llX\n", to); |
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return written; |
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} |
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to += (loff_t)written; |
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len -= written; |
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*retlen += written; |
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buf += written; |
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} |
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return 0; |
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} |
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static void bcm47xxsflash_fill_mtd(struct bcm47xxsflash *b47s, |
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struct device *dev) |
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{ |
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struct mtd_info *mtd = &b47s->mtd; |
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mtd->priv = b47s; |
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mtd->dev.parent = dev; |
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mtd->name = "bcm47xxsflash"; |
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mtd->type = MTD_NORFLASH; |
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mtd->flags = MTD_CAP_NORFLASH; |
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mtd->size = b47s->size; |
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mtd->erasesize = b47s->blocksize; |
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mtd->writesize = 1; |
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mtd->writebufsize = 1; |
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mtd->_erase = bcm47xxsflash_erase; |
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mtd->_read = bcm47xxsflash_read; |
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mtd->_write = bcm47xxsflash_write; |
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} |
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/************************************************** |
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* BCMA |
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**************************************************/ |
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static int bcm47xxsflash_bcma_cc_read(struct bcm47xxsflash *b47s, u16 offset) |
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{ |
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return bcma_cc_read32(b47s->bcma_cc, offset); |
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} |
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static void bcm47xxsflash_bcma_cc_write(struct bcm47xxsflash *b47s, u16 offset, |
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u32 value) |
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{ |
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bcma_cc_write32(b47s->bcma_cc, offset, value); |
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} |
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static int bcm47xxsflash_bcma_probe(struct platform_device *pdev) |
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{ |
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struct device *dev = &pdev->dev; |
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struct bcma_sflash *sflash = dev_get_platdata(dev); |
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struct bcm47xxsflash *b47s; |
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struct resource *res; |
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int err; |
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b47s = devm_kzalloc(dev, sizeof(*b47s), GFP_KERNEL); |
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if (!b47s) |
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return -ENOMEM; |
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res = platform_get_resource(pdev, IORESOURCE_MEM, 0); |
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if (!res) { |
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dev_err(dev, "invalid resource\n"); |
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return -EINVAL; |
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} |
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if (!devm_request_mem_region(dev, res->start, resource_size(res), |
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res->name)) { |
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dev_err(dev, "can't request region for resource %pR\n", res); |
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return -EBUSY; |
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} |
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b47s->bcma_cc = container_of(sflash, struct bcma_drv_cc, sflash); |
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b47s->cc_read = bcm47xxsflash_bcma_cc_read; |
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b47s->cc_write = bcm47xxsflash_bcma_cc_write; |
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/* |
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* On old MIPS devices cache was magically invalidated when needed, |
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* allowing us to use cached access and gain some performance. Trying |
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* the same on ARM based BCM53573 results in flash corruptions, we need |
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* to use uncached access for it. |
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* |
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* It may be arch specific, but right now there is only 1 ARM SoC using |
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* this driver, so let's follow Broadcom's reference code and check |
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* ChipCommon revision. |
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*/ |
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if (b47s->bcma_cc->core->id.rev == 54) |
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b47s->window = ioremap(res->start, resource_size(res)); |
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else |
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b47s->window = ioremap_cache(res->start, resource_size(res)); |
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if (!b47s->window) { |
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dev_err(dev, "ioremap failed for resource %pR\n", res); |
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return -ENOMEM; |
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} |
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switch (b47s->bcma_cc->capabilities & BCMA_CC_CAP_FLASHT) { |
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case BCMA_CC_FLASHT_STSER: |
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b47s->type = BCM47XXSFLASH_TYPE_ST; |
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break; |
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case BCMA_CC_FLASHT_ATSER: |
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b47s->type = BCM47XXSFLASH_TYPE_ATMEL; |
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break; |
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} |
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b47s->blocksize = sflash->blocksize; |
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b47s->numblocks = sflash->numblocks; |
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b47s->size = sflash->size; |
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bcm47xxsflash_fill_mtd(b47s, &pdev->dev); |
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platform_set_drvdata(pdev, b47s); |
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err = mtd_device_parse_register(&b47s->mtd, probes, NULL, NULL, 0); |
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if (err) { |
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pr_err("Failed to register MTD device: %d\n", err); |
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iounmap(b47s->window); |
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return err; |
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} |
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if (bcm47xxsflash_poll(b47s, HZ / 10)) |
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pr_warn("Serial flash busy\n"); |
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return 0; |
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} |
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static int bcm47xxsflash_bcma_remove(struct platform_device *pdev) |
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{ |
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struct bcm47xxsflash *b47s = platform_get_drvdata(pdev); |
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mtd_device_unregister(&b47s->mtd); |
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iounmap(b47s->window); |
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return 0; |
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} |
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static struct platform_driver bcma_sflash_driver = { |
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.probe = bcm47xxsflash_bcma_probe, |
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.remove = bcm47xxsflash_bcma_remove, |
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.driver = { |
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.name = "bcma_sflash", |
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}, |
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}; |
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/************************************************** |
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* Init |
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**************************************************/ |
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module_platform_driver(bcma_sflash_driver);
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