+++ /dev/null
-
-/*
- * MTD driver for the SPI Flash Memory support.
- *
- * Copyright (c) 2005-2006 Atheros Communications Inc.
- * Copyright (C) 2006 FON Technology, SL.
- * Copyright (C) 2006 Imre Kaloz <kaloz@openwrt.org>
- * Copyright (C) 2006 Felix Fietkau <nbd@openwrt.org>
- *
- * This code is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License version 2 as
- * published by the Free Software Foundation.
- *
- */
-
-/*===========================================================================
-** !!!! VERY IMPORTANT NOTICE !!!! FLASH DATA STORED IN LITTLE ENDIAN FORMAT
-**
-** This module contains the Serial Flash access routines for the Atheros SOC.
-** The Atheros SOC integrates a SPI flash controller that is used to access
-** serial flash parts. The SPI flash controller executes in "Little Endian"
-** mode. THEREFORE, all WRITES and READS from the MIPS CPU must be
-** BYTESWAPPED! The SPI Flash controller hardware by default performs READ
-** ONLY byteswapping when accessed via the SPI Flash Alias memory region
-** (Physical Address 0x0800_0000 - 0x0fff_ffff). The data stored in the
-** flash sectors is stored in "Little Endian" format.
-**
-** The spiflash_write() routine performs byteswapping on all write
-** operations.
-**===========================================================================*/
-
-#include <linux/kernel.h>
-#include <linux/module.h>
-#include <linux/types.h>
-#include <linux/version.h>
-#include <linux/errno.h>
-#include <linux/slab.h>
-#include <linux/mtd/mtd.h>
-#include <linux/mtd/partitions.h>
-#include <linux/platform_device.h>
-#include <linux/squashfs_fs.h>
-#include <linux/root_dev.h>
-#include <asm/delay.h>
-#include <asm/io.h>
-#include "spiflash.h"
-
-/* debugging */
-/* #define SPIFLASH_DEBUG */
-
-#ifndef __BIG_ENDIAN
-#error This driver currently only works with big endian CPU.
-#endif
-
-#define MAX_PARTS 32
-
-static char module_name[] = "spiflash";
-
-#define MIN(a,b) ((a) < (b) ? (a) : (b))
-#define FALSE 0
-#define TRUE 1
-
-#define ROOTFS_NAME "rootfs"
-
-static __u32 spiflash_regread32(int reg);
-static void spiflash_regwrite32(int reg, __u32 data);
-static __u32 spiflash_sendcmd (int op);
-
-int __init spiflash_init (void);
-void __exit spiflash_exit (void);
-static int spiflash_probe_chip (void);
-static int spiflash_erase (struct mtd_info *mtd,struct erase_info *instr);
-static int spiflash_read (struct mtd_info *mtd, loff_t from,size_t len,size_t *retlen,u_char *buf);
-static int spiflash_write (struct mtd_info *mtd,loff_t to,size_t len,size_t *retlen,const u_char *buf);
-
-/* Flash configuration table */
-struct flashconfig {
- __u32 byte_cnt;
- __u32 sector_cnt;
- __u32 sector_size;
- __u32 cs_addrmask;
-} flashconfig_tbl[MAX_FLASH] =
- {
- { 0, 0, 0, 0},
- { STM_1MB_BYTE_COUNT, STM_1MB_SECTOR_COUNT, STM_1MB_SECTOR_SIZE, 0x0},
- { STM_2MB_BYTE_COUNT, STM_2MB_SECTOR_COUNT, STM_2MB_SECTOR_SIZE, 0x0},
- { STM_4MB_BYTE_COUNT, STM_4MB_SECTOR_COUNT, STM_4MB_SECTOR_SIZE, 0x0},
- { STM_8MB_BYTE_COUNT, STM_8MB_SECTOR_COUNT, STM_8MB_SECTOR_SIZE, 0x0},
- { STM_16MB_BYTE_COUNT, STM_16MB_SECTOR_COUNT, STM_16MB_SECTOR_SIZE, 0x0}
- };
-
-/* Mapping of generic opcodes to STM serial flash opcodes */
-struct opcodes {
- __u16 code;
- __s8 tx_cnt;
- __s8 rx_cnt;
-} stm_opcodes[] = {
- {STM_OP_WR_ENABLE, 1, 0},
- {STM_OP_WR_DISABLE, 1, 0},
- {STM_OP_RD_STATUS, 1, 1},
- {STM_OP_WR_STATUS, 1, 0},
- {STM_OP_RD_DATA, 4, 4},
- {STM_OP_FAST_RD_DATA, 1, 0},
- {STM_OP_PAGE_PGRM, 8, 0},
- {STM_OP_SECTOR_ERASE, 4, 0},
- {STM_OP_BULK_ERASE, 1, 0},
- {STM_OP_DEEP_PWRDOWN, 1, 0},
- {STM_OP_RD_SIG, 4, 1}
-};
-
-/* Driver private data structure */
-struct spiflash_data {
- struct mtd_info *mtd;
- struct mtd_partition *parsed_parts; /* parsed partitions */
- void *spiflash_readaddr; /* memory mapped data for read */
- void *spiflash_mmraddr; /* memory mapped register space */
- spinlock_t mutex;
-};
-
-static struct spiflash_data *spidata;
-
-extern int parse_redboot_partitions(struct mtd_info *master, struct mtd_partition **pparts);
-
-/***************************************************************************************************/
-
-static __u32
-spiflash_regread32(int reg)
-{
- volatile __u32 *data = (__u32 *)(spidata->spiflash_mmraddr + reg);
-
- return (*data);
-}
-
-static void
-spiflash_regwrite32(int reg, __u32 data)
-{
- volatile __u32 *addr = (__u32 *)(spidata->spiflash_mmraddr + reg);
-
- *addr = data;
- return;
-}
-
-static __u32
-spiflash_sendcmd (int op)
-{
- __u32 reg;
- __u32 mask;
- struct opcodes *ptr_opcode;
-
- ptr_opcode = &stm_opcodes[op];
-
- do {
- reg = spiflash_regread32(SPI_FLASH_CTL);
- } while (reg & SPI_CTL_BUSY);
-
- spiflash_regwrite32(SPI_FLASH_OPCODE, ptr_opcode->code);
-
- reg = (reg & ~SPI_CTL_TX_RX_CNT_MASK) | ptr_opcode->tx_cnt |
- (ptr_opcode->rx_cnt << 4) | SPI_CTL_START;
-
- spiflash_regwrite32(SPI_FLASH_CTL, reg);
-
- if (ptr_opcode->rx_cnt > 0) {
- do {
- reg = spiflash_regread32(SPI_FLASH_CTL);
- } while (reg & SPI_CTL_BUSY);
-
- reg = (__u32) spiflash_regread32(SPI_FLASH_DATA);
-
- switch (ptr_opcode->rx_cnt) {
- case 1:
- mask = 0x000000ff;
- break;
- case 2:
- mask = 0x0000ffff;
- break;
- case 3:
- mask = 0x00ffffff;
- break;
- default:
- mask = 0xffffffff;
- break;
- }
-
- reg &= mask;
- }
- else {
- reg = 0;
- }
-
- return reg;
-}
-
-/* Probe SPI flash device
- * Function returns 0 for failure.
- * and flashconfig_tbl array index for success.
- */
-static int
-spiflash_probe_chip (void)
-{
- __u32 sig;
- int flash_size;
-
- /* Read the signature on the flash device */
- sig = spiflash_sendcmd(SPI_RD_SIG);
-
- switch (sig) {
- case STM_8MBIT_SIGNATURE:
- flash_size = FLASH_1MB;
- break;
- case STM_16MBIT_SIGNATURE:
- flash_size = FLASH_2MB;
- break;
- case STM_32MBIT_SIGNATURE:
- flash_size = FLASH_4MB;
- break;
- case STM_64MBIT_SIGNATURE:
- flash_size = FLASH_8MB;
- break;
- case STM_128MBIT_SIGNATURE:
- flash_size = FLASH_16MB;
- break;
- default:
- printk (KERN_WARNING "%s: Read of flash device signature failed!\n", module_name);
- return (0);
- }
-
- return (flash_size);
-}
-
-
-static int
-spiflash_erase (struct mtd_info *mtd,struct erase_info *instr)
-{
- struct opcodes *ptr_opcode;
- __u32 temp, reg;
- int finished = FALSE;
-
-#ifdef SPIFLASH_DEBUG
- printk (KERN_DEBUG "%s(addr = 0x%.8x, len = %d)\n",__FUNCTION__,instr->addr,instr->len);
-#endif
-
- /* sanity checks */
- if (instr->addr + instr->len > mtd->size) return (-EINVAL);
-
- ptr_opcode = &stm_opcodes[SPI_SECTOR_ERASE];
-
- temp = ((__u32)instr->addr << 8) | (__u32)(ptr_opcode->code);
- spin_lock(&spidata->mutex);
- spiflash_sendcmd(SPI_WRITE_ENABLE);
- do {
- schedule();
- reg = spiflash_regread32(SPI_FLASH_CTL);
- } while (reg & SPI_CTL_BUSY);
-
- spiflash_regwrite32(SPI_FLASH_OPCODE, temp);
-
- reg = (reg & ~SPI_CTL_TX_RX_CNT_MASK) | ptr_opcode->tx_cnt | SPI_CTL_START;
- spiflash_regwrite32(SPI_FLASH_CTL, reg);
-
- do {
- schedule();
- reg = spiflash_sendcmd(SPI_RD_STATUS);
- if (!(reg & SPI_STATUS_WIP)) {
- finished = TRUE;
- }
- } while (!finished);
- spin_unlock(&spidata->mutex);
-
- instr->state = MTD_ERASE_DONE;
- if (instr->callback) instr->callback (instr);
-
-#ifdef SPIFLASH_DEBUG
- printk (KERN_DEBUG "%s return\n",__FUNCTION__);
-#endif
- return (0);
-}
-
-static int
-spiflash_read (struct mtd_info *mtd, loff_t from,size_t len,size_t *retlen,u_char *buf)
-{
- u_char *read_addr;
-
-#ifdef SPIFLASH_DEBUG
- printk (KERN_DEBUG "%s(from = 0x%.8x, len = %d)\n",__FUNCTION__,(__u32) from,(int)len);
-#endif
-
- /* sanity checks */
- if (!len) return (0);
- if (from + len > mtd->size) return (-EINVAL);
-
-
- /* we always read len bytes */
- *retlen = len;
-
- read_addr = (u_char *)(spidata->spiflash_readaddr + from);
- spin_lock(&spidata->mutex);
- memcpy(buf, read_addr, len);
- spin_unlock(&spidata->mutex);
-
- return (0);
-}
-
-static int
-spiflash_write (struct mtd_info *mtd,loff_t to,size_t len,size_t *retlen,const u_char *buf)
-{
- int done = FALSE, page_offset, bytes_left, finished;
- __u32 xact_len, spi_data = 0, opcode, reg;
-
-#ifdef SPIFLASH_DEBUG
- printk (KERN_DEBUG "%s(to = 0x%.8x, len = %d)\n",__FUNCTION__,(__u32) to,len);
-#endif
-
- *retlen = 0;
-
- /* sanity checks */
- if (!len) return (0);
- if (to + len > mtd->size) return (-EINVAL);
-
- opcode = stm_opcodes[SPI_PAGE_PROGRAM].code;
- bytes_left = len;
-
- while (done == FALSE) {
- xact_len = MIN(bytes_left, sizeof(__u32));
-
- /* 32-bit writes cannot span across a page boundary
- * (256 bytes). This types of writes require two page
- * program operations to handle it correctly. The STM part
- * will write the overflow data to the beginning of the
- * current page as opposed to the subsequent page.
- */
- page_offset = (to & (STM_PAGE_SIZE - 1)) + xact_len;
-
- if (page_offset > STM_PAGE_SIZE) {
- xact_len -= (page_offset - STM_PAGE_SIZE);
- }
-
- spin_lock(&spidata->mutex);
- spiflash_sendcmd(SPI_WRITE_ENABLE);
-
- do {
- schedule();
- reg = spiflash_regread32(SPI_FLASH_CTL);
- } while (reg & SPI_CTL_BUSY);
-
- switch (xact_len) {
- case 1:
- spi_data = (u32) ((u8) *buf);
- break;
- case 2:
- spi_data = (buf[1] << 8) | buf[0];
- break;
- case 3:
- spi_data = (buf[2] << 16) | (buf[1] << 8) | buf[0];
- break;
- case 4:
- spi_data = (buf[3] << 24) | (buf[2] << 16) |
- (buf[1] << 8) | buf[0];
- break;
- default:
- printk("spiflash_write: default case\n");
- break;
- }
-
- spiflash_regwrite32(SPI_FLASH_DATA, spi_data);
- opcode = (opcode & SPI_OPCODE_MASK) | ((__u32)to << 8);
- spiflash_regwrite32(SPI_FLASH_OPCODE, opcode);
-
- reg = (reg & ~SPI_CTL_TX_RX_CNT_MASK) | (xact_len + 4) | SPI_CTL_START;
- spiflash_regwrite32(SPI_FLASH_CTL, reg);
- finished = FALSE;
-
- do {
- schedule();
- reg = spiflash_sendcmd(SPI_RD_STATUS);
- if (!(reg & SPI_STATUS_WIP)) {
- finished = TRUE;
- }
- } while (!finished);
- spin_unlock(&spidata->mutex);
-
- bytes_left -= xact_len;
- to += xact_len;
- buf += xact_len;
-
- *retlen += xact_len;
-
- if (bytes_left == 0) {
- done = TRUE;
- }
- }
-
- return (0);
-}
-
-
-#ifdef CONFIG_MTD_PARTITIONS
-static const char *part_probe_types[] = { "cmdlinepart", "RedBoot", NULL };
-#endif
-
-
-static int spiflash_probe(struct platform_device *pdev)
-{
- int i, result = -1;
- int index, num_parts;
- struct mtd_info *mtd;
-
- spidata->spiflash_mmraddr = ioremap_nocache(SPI_FLASH_MMR, SPI_FLASH_MMR_SIZE);
-
- if (!spidata->spiflash_mmraddr) {
- printk (KERN_WARNING "%s: Failed to map flash device\n", module_name);
- kfree(spidata);
- spidata = NULL;
- }
-
- mtd = kzalloc(sizeof(struct mtd_info), GFP_KERNEL);
- if (!mtd) {
- kfree(spidata);
- return (-ENXIO);
- }
-
- printk ("MTD driver for SPI flash.\n");
- printk ("%s: Probing for Serial flash ...\n", module_name);
- if (!(index = spiflash_probe_chip())) {
- printk (KERN_WARNING "%s: Found no serial flash device\n", module_name);
- kfree(mtd);
- kfree(spidata);
- return (-ENXIO);
- }
-
- printk ("%s: Found SPI serial Flash.\n", module_name);
-
- spidata->spiflash_readaddr = ioremap_nocache(SPI_FLASH_READ, flashconfig_tbl[index].byte_cnt);
- if (!spidata->spiflash_readaddr) {
- printk (KERN_WARNING "%s: Failed to map flash device\n", module_name);
- kfree(mtd);
- kfree(spidata);
- return (-ENXIO);
- }
-
- mtd->name = module_name;
- mtd->type = MTD_NORFLASH;
- mtd->flags = (MTD_CAP_NORFLASH|MTD_WRITEABLE);
- mtd->size = flashconfig_tbl[index].byte_cnt;
- mtd->erasesize = flashconfig_tbl[index].sector_size;
- mtd->writesize = 1;
- mtd->numeraseregions = 0;
- mtd->eraseregions = NULL;
- mtd->erase = spiflash_erase;
- mtd->read = spiflash_read;
- mtd->write = spiflash_write;
- mtd->owner = THIS_MODULE;
-
-#ifdef SPIFLASH_DEBUG
- printk (KERN_DEBUG
- "mtd->name = %s\n"
- "mtd->size = 0x%.8x (%uM)\n"
- "mtd->erasesize = 0x%.8x (%uK)\n"
- "mtd->numeraseregions = %d\n",
- mtd->name,
- mtd->size, mtd->size / (1024*1024),
- mtd->erasesize, mtd->erasesize / 1024,
- mtd->numeraseregions);
-
- if (mtd->numeraseregions) {
- for (result = 0; result < mtd->numeraseregions; result++) {
- printk (KERN_DEBUG
- "\n\n"
- "mtd->eraseregions[%d].offset = 0x%.8x\n"
- "mtd->eraseregions[%d].erasesize = 0x%.8x (%uK)\n"
- "mtd->eraseregions[%d].numblocks = %d\n",
- result,mtd->eraseregions[result].offset,
- result,mtd->eraseregions[result].erasesize,mtd->eraseregions[result].erasesize / 1024,
- result,mtd->eraseregions[result].numblocks);
- }
- }
-#endif
- /* parse redboot partitions */
- num_parts = parse_mtd_partitions(mtd, part_probe_types, &spidata->parsed_parts, 0);
-
-#ifdef SPIFLASH_DEBUG
- printk (KERN_DEBUG "Found %d partitions\n", num_parts);
-#endif
- if (num_parts) {
- result = add_mtd_partitions(mtd, spidata->parsed_parts, num_parts);
- } else {
-#ifdef SPIFLASH_DEBUG
- printk (KERN_DEBUG "Did not find any partitions\n");
-#endif
- kfree(mtd);
- kfree(spidata);
- return (-ENXIO);
- }
-
- spidata->mtd = mtd;
-
- return (result);
-}
-
-static int spiflash_remove (struct platform_device *pdev)
-{
- del_mtd_partitions (spidata->mtd);
- kfree(spidata->mtd);
-
- return 0;
-}
-
-struct platform_driver spiflash_driver = {
- .driver.name = "spiflash",
- .probe = spiflash_probe,
- .remove = spiflash_remove,
-};
-
-int __init
-spiflash_init (void)
-{
- spidata = kmalloc(sizeof(struct spiflash_data), GFP_KERNEL);
- if (!spidata)
- return (-ENXIO);
-
- spin_lock_init(&spidata->mutex);
- platform_driver_register(&spiflash_driver);
-
- return 0;
-}
-
-void __exit
-spiflash_exit (void)
-{
- kfree(spidata);
-}
-
-module_init (spiflash_init);
-module_exit (spiflash_exit);
-
-MODULE_LICENSE("GPL");
-MODULE_AUTHOR("Atheros Communications Inc");
-MODULE_DESCRIPTION("MTD driver for SPI Flash on Atheros SOC");
-
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