551 lines
12 KiB
C
551 lines
12 KiB
C
/*
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* Atmel SPI DataFlash support
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*
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* Copyright (C) 2008 Atmel Corporation
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* Licensed under the GPL-2 or later.
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*/
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#include <common.h>
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#include <malloc.h>
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#include <spi_flash.h>
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#include "spi_flash_internal.h"
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/* AT45-specific commands */
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#define CMD_AT45_READ_STATUS 0xd7
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#define CMD_AT45_ERASE_PAGE 0x81
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#define CMD_AT45_LOAD_PROG_BUF1 0x82
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#define CMD_AT45_LOAD_BUF1 0x84
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#define CMD_AT45_LOAD_PROG_BUF2 0x85
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#define CMD_AT45_LOAD_BUF2 0x87
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#define CMD_AT45_PROG_BUF1 0x88
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#define CMD_AT45_PROG_BUF2 0x89
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/* AT45 status register bits */
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#define AT45_STATUS_P2_PAGE_SIZE (1 << 0)
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#define AT45_STATUS_READY (1 << 7)
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/* DataFlash family IDs, as obtained from the second idcode byte */
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#define DF_FAMILY_AT26F 0
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#define DF_FAMILY_AT45 1
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#define DF_FAMILY_AT26DF 2 /* AT25DF and AT26DF */
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struct atmel_spi_flash_params {
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u8 idcode1;
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/* Log2 of page size in power-of-two mode */
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u8 l2_page_size;
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u8 pages_per_block;
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u8 blocks_per_sector;
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u8 nr_sectors;
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const char *name;
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};
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/* spi_flash needs to be first so upper layers can free() it */
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struct atmel_spi_flash {
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struct spi_flash flash;
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const struct atmel_spi_flash_params *params;
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};
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static inline struct atmel_spi_flash *
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to_atmel_spi_flash(struct spi_flash *flash)
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{
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return container_of(flash, struct atmel_spi_flash, flash);
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}
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static const struct atmel_spi_flash_params atmel_spi_flash_table[] = {
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{
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.idcode1 = 0x22,
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.l2_page_size = 8,
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.pages_per_block = 8,
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.blocks_per_sector = 16,
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.nr_sectors = 4,
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.name = "AT45DB011D",
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},
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{
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.idcode1 = 0x23,
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.l2_page_size = 8,
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.pages_per_block = 8,
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.blocks_per_sector = 16,
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.nr_sectors = 8,
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.name = "AT45DB021D",
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},
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{
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.idcode1 = 0x24,
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.l2_page_size = 8,
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.pages_per_block = 8,
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.blocks_per_sector = 32,
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.nr_sectors = 8,
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.name = "AT45DB041D",
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},
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{
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.idcode1 = 0x25,
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.l2_page_size = 8,
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.pages_per_block = 8,
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.blocks_per_sector = 32,
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.nr_sectors = 16,
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.name = "AT45DB081D",
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},
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{
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.idcode1 = 0x26,
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.l2_page_size = 9,
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.pages_per_block = 8,
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.blocks_per_sector = 32,
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.nr_sectors = 16,
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.name = "AT45DB161D",
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},
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{
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.idcode1 = 0x27,
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.l2_page_size = 9,
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.pages_per_block = 8,
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.blocks_per_sector = 64,
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.nr_sectors = 64,
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.name = "AT45DB321D",
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},
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{
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.idcode1 = 0x28,
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.l2_page_size = 10,
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.pages_per_block = 8,
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.blocks_per_sector = 32,
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.nr_sectors = 32,
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.name = "AT45DB642D",
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},
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};
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static int at45_wait_ready(struct spi_flash *flash, unsigned long timeout)
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{
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struct spi_slave *spi = flash->spi;
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unsigned long timebase;
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int ret;
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u8 cmd = CMD_AT45_READ_STATUS;
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u8 status;
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timebase = get_timer(0);
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ret = spi_xfer(spi, 8, &cmd, NULL, SPI_XFER_BEGIN);
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if (ret)
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return -1;
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do {
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ret = spi_xfer(spi, 8, NULL, &status, 0);
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if (ret)
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return -1;
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if (status & AT45_STATUS_READY)
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break;
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} while (get_timer(timebase) < timeout);
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/* Deactivate CS */
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spi_xfer(spi, 0, NULL, NULL, SPI_XFER_END);
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if (status & AT45_STATUS_READY)
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return 0;
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/* Timed out */
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return -1;
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}
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/*
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* Assemble the address part of a command for AT45 devices in
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* non-power-of-two page size mode.
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*/
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static void at45_build_address(struct atmel_spi_flash *asf, u8 *cmd, u32 offset)
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{
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unsigned long page_addr;
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unsigned long byte_addr;
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unsigned long page_size;
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unsigned int page_shift;
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/*
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* The "extra" space per page is the power-of-two page size
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* divided by 32.
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*/
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page_shift = asf->params->l2_page_size;
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page_size = (1 << page_shift) + (1 << (page_shift - 5));
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page_shift++;
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page_addr = offset / page_size;
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byte_addr = offset % page_size;
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cmd[0] = page_addr >> (16 - page_shift);
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cmd[1] = page_addr << (page_shift - 8) | (byte_addr >> 8);
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cmd[2] = byte_addr;
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}
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static int dataflash_read_fast_p2(struct spi_flash *flash,
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u32 offset, size_t len, void *buf)
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{
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u8 cmd[5];
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cmd[0] = CMD_READ_ARRAY_FAST;
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cmd[1] = offset >> 16;
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cmd[2] = offset >> 8;
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cmd[3] = offset;
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cmd[4] = 0x00;
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return spi_flash_read_common(flash, cmd, sizeof(cmd), buf, len);
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}
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static int dataflash_read_fast_at45(struct spi_flash *flash,
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u32 offset, size_t len, void *buf)
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{
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struct atmel_spi_flash *asf = to_atmel_spi_flash(flash);
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u8 cmd[5];
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cmd[0] = CMD_READ_ARRAY_FAST;
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at45_build_address(asf, cmd + 1, offset);
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cmd[4] = 0x00;
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return spi_flash_read_common(flash, cmd, sizeof(cmd), buf, len);
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}
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/*
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* TODO: the two write funcs (_p2/_at45) should get unified ...
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*/
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static int dataflash_write_p2(struct spi_flash *flash,
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u32 offset, size_t len, const void *buf)
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{
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struct atmel_spi_flash *asf = to_atmel_spi_flash(flash);
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unsigned long page_size;
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u32 addr = offset;
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size_t chunk_len;
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size_t actual;
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int ret;
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u8 cmd[4];
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/*
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* TODO: This function currently uses only page buffer #1. We can
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* speed this up by using both buffers and loading one buffer while
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* the other is being programmed into main memory.
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*/
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page_size = (1 << asf->params->l2_page_size);
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ret = spi_claim_bus(flash->spi);
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if (ret) {
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debug("SF: Unable to claim SPI bus\n");
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return ret;
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}
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for (actual = 0; actual < len; actual += chunk_len) {
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chunk_len = min(len - actual, page_size - (addr % page_size));
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/* Use the same address bits for both commands */
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cmd[0] = CMD_AT45_LOAD_BUF1;
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cmd[1] = addr >> 16;
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cmd[2] = addr >> 8;
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cmd[3] = addr;
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ret = spi_flash_cmd_write(flash->spi, cmd, 4,
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buf + actual, chunk_len);
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if (ret < 0) {
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debug("SF: Loading AT45 buffer failed\n");
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goto out;
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}
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cmd[0] = CMD_AT45_PROG_BUF1;
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ret = spi_flash_cmd_write(flash->spi, cmd, 4, NULL, 0);
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if (ret < 0) {
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debug("SF: AT45 page programming failed\n");
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goto out;
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}
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ret = at45_wait_ready(flash, SPI_FLASH_PROG_TIMEOUT);
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if (ret < 0) {
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debug("SF: AT45 page programming timed out\n");
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goto out;
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}
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addr += chunk_len;
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}
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debug("SF: AT45: Successfully programmed %zu bytes @ 0x%x\n",
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len, offset);
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ret = 0;
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out:
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spi_release_bus(flash->spi);
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return ret;
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}
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static int dataflash_write_at45(struct spi_flash *flash,
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u32 offset, size_t len, const void *buf)
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{
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struct atmel_spi_flash *asf = to_atmel_spi_flash(flash);
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unsigned long page_addr;
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unsigned long byte_addr;
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unsigned long page_size;
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unsigned int page_shift;
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size_t chunk_len;
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size_t actual;
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int ret;
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u8 cmd[4];
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/*
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* TODO: This function currently uses only page buffer #1. We can
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* speed this up by using both buffers and loading one buffer while
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* the other is being programmed into main memory.
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*/
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page_shift = asf->params->l2_page_size;
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page_size = (1 << page_shift) + (1 << (page_shift - 5));
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page_shift++;
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page_addr = offset / page_size;
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byte_addr = offset % page_size;
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ret = spi_claim_bus(flash->spi);
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if (ret) {
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debug("SF: Unable to claim SPI bus\n");
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return ret;
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}
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for (actual = 0; actual < len; actual += chunk_len) {
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chunk_len = min(len - actual, page_size - byte_addr);
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/* Use the same address bits for both commands */
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cmd[0] = CMD_AT45_LOAD_BUF1;
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cmd[1] = page_addr >> (16 - page_shift);
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cmd[2] = page_addr << (page_shift - 8) | (byte_addr >> 8);
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cmd[3] = byte_addr;
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ret = spi_flash_cmd_write(flash->spi, cmd, 4,
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buf + actual, chunk_len);
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if (ret < 0) {
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debug("SF: Loading AT45 buffer failed\n");
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goto out;
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}
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cmd[0] = CMD_AT45_PROG_BUF1;
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ret = spi_flash_cmd_write(flash->spi, cmd, 4, NULL, 0);
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if (ret < 0) {
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debug("SF: AT45 page programming failed\n");
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goto out;
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}
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ret = at45_wait_ready(flash, SPI_FLASH_PROG_TIMEOUT);
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if (ret < 0) {
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debug("SF: AT45 page programming timed out\n");
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goto out;
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}
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page_addr++;
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byte_addr = 0;
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}
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debug("SF: AT45: Successfully programmed %zu bytes @ 0x%x\n",
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len, offset);
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ret = 0;
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out:
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spi_release_bus(flash->spi);
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return ret;
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}
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/*
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* TODO: the two erase funcs (_p2/_at45) should get unified ...
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*/
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int dataflash_erase_p2(struct spi_flash *flash, u32 offset, size_t len)
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{
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struct atmel_spi_flash *asf = to_atmel_spi_flash(flash);
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unsigned long page_size;
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size_t actual;
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int ret;
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u8 cmd[4];
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/*
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* TODO: This function currently uses page erase only. We can
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* probably speed things up by using block and/or sector erase
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* when possible.
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*/
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page_size = (1 << asf->params->l2_page_size);
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if (offset % page_size || len % page_size) {
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debug("SF: Erase offset/length not multiple of page size\n");
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return -1;
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}
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cmd[0] = CMD_AT45_ERASE_PAGE;
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cmd[3] = 0x00;
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ret = spi_claim_bus(flash->spi);
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if (ret) {
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debug("SF: Unable to claim SPI bus\n");
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return ret;
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}
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for (actual = 0; actual < len; actual += page_size) {
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cmd[1] = offset >> 16;
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cmd[2] = offset >> 8;
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ret = spi_flash_cmd_write(flash->spi, cmd, 4, NULL, 0);
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if (ret < 0) {
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debug("SF: AT45 page erase failed\n");
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goto out;
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}
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ret = at45_wait_ready(flash, SPI_FLASH_PAGE_ERASE_TIMEOUT);
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if (ret < 0) {
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debug("SF: AT45 page erase timed out\n");
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goto out;
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}
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offset += page_size;
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}
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debug("SF: AT45: Successfully erased %zu bytes @ 0x%x\n",
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len, offset);
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ret = 0;
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out:
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spi_release_bus(flash->spi);
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return ret;
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}
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int dataflash_erase_at45(struct spi_flash *flash, u32 offset, size_t len)
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{
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struct atmel_spi_flash *asf = to_atmel_spi_flash(flash);
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unsigned long page_addr;
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unsigned long page_size;
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unsigned int page_shift;
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size_t actual;
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int ret;
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u8 cmd[4];
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/*
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* TODO: This function currently uses page erase only. We can
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* probably speed things up by using block and/or sector erase
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* when possible.
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*/
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page_shift = asf->params->l2_page_size;
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page_size = (1 << page_shift) + (1 << (page_shift - 5));
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page_shift++;
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page_addr = offset / page_size;
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if (offset % page_size || len % page_size) {
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debug("SF: Erase offset/length not multiple of page size\n");
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return -1;
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}
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cmd[0] = CMD_AT45_ERASE_PAGE;
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cmd[3] = 0x00;
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ret = spi_claim_bus(flash->spi);
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if (ret) {
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debug("SF: Unable to claim SPI bus\n");
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return ret;
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}
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for (actual = 0; actual < len; actual += page_size) {
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cmd[1] = page_addr >> (16 - page_shift);
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cmd[2] = page_addr << (page_shift - 8);
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ret = spi_flash_cmd_write(flash->spi, cmd, 4, NULL, 0);
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if (ret < 0) {
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debug("SF: AT45 page erase failed\n");
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goto out;
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}
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ret = at45_wait_ready(flash, SPI_FLASH_PAGE_ERASE_TIMEOUT);
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if (ret < 0) {
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debug("SF: AT45 page erase timed out\n");
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goto out;
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}
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page_addr++;
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}
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debug("SF: AT45: Successfully erased %zu bytes @ 0x%x\n",
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len, offset);
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ret = 0;
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out:
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spi_release_bus(flash->spi);
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return ret;
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}
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struct spi_flash *spi_flash_probe_atmel(struct spi_slave *spi, u8 *idcode)
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{
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const struct atmel_spi_flash_params *params;
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unsigned long page_size;
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unsigned int family;
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struct atmel_spi_flash *asf;
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unsigned int i;
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int ret;
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u8 status;
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for (i = 0; i < ARRAY_SIZE(atmel_spi_flash_table); i++) {
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params = &atmel_spi_flash_table[i];
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if (params->idcode1 == idcode[1])
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break;
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}
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if (i == ARRAY_SIZE(atmel_spi_flash_table)) {
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debug("SF: Unsupported DataFlash ID %02x\n",
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idcode[1]);
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return NULL;
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}
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asf = malloc(sizeof(struct atmel_spi_flash));
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if (!asf) {
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debug("SF: Failed to allocate memory\n");
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return NULL;
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}
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asf->params = params;
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asf->flash.spi = spi;
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asf->flash.name = params->name;
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/* Assuming power-of-two page size initially. */
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page_size = 1 << params->l2_page_size;
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family = idcode[1] >> 5;
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switch (family) {
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case DF_FAMILY_AT45:
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/*
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* AT45 chips have configurable page size. The status
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* register indicates which configuration is active.
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*/
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ret = spi_flash_cmd(spi, CMD_AT45_READ_STATUS, &status, 1);
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if (ret)
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goto err;
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debug("SF: AT45 status register: %02x\n", status);
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if (!(status & AT45_STATUS_P2_PAGE_SIZE)) {
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asf->flash.read = dataflash_read_fast_at45;
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asf->flash.write = dataflash_write_at45;
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asf->flash.erase = dataflash_erase_at45;
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page_size += 1 << (params->l2_page_size - 5);
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} else {
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asf->flash.read = dataflash_read_fast_p2;
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asf->flash.write = dataflash_write_p2;
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asf->flash.erase = dataflash_erase_p2;
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}
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break;
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case DF_FAMILY_AT26F:
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case DF_FAMILY_AT26DF:
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asf->flash.read = dataflash_read_fast_p2;
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break;
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default:
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debug("SF: Unsupported DataFlash family %u\n", family);
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goto err;
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}
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asf->flash.size = page_size * params->pages_per_block
|
|
* params->blocks_per_sector
|
|
* params->nr_sectors;
|
|
|
|
debug("SF: Detected %s with page size %lu, total %u bytes\n",
|
|
params->name, page_size, asf->flash.size);
|
|
|
|
return &asf->flash;
|
|
|
|
err:
|
|
free(asf);
|
|
return NULL;
|
|
}
|