303 lines
6.7 KiB
C
303 lines
6.7 KiB
C
/*
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* Broadcom SiliconBackplane chipcommon serial flash interface
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*
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* Copyright 2006, Broadcom Corporation
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* All Rights Reserved.
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*
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* THIS SOFTWARE IS OFFERED "AS IS", AND BROADCOM GRANTS NO WARRANTIES OF ANY
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* KIND, EXPRESS OR IMPLIED, BY STATUTE, COMMUNICATION OR OTHERWISE. BROADCOM
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* SPECIFICALLY DISCLAIMS ANY IMPLIED WARRANTIES OF MERCHANTABILITY, FITNESS
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* FOR A SPECIFIC PURPOSE OR NONINFRINGEMENT CONCERNING THIS SOFTWARE.
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*
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* $Id$
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*/
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#include <linux/config.h>
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#include <linux/module.h>
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#include <linux/slab.h>
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#include <linux/ioport.h>
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#include <linux/mtd/compatmac.h>
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#include <linux/mtd/mtd.h>
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#include <linux/mtd/partitions.h>
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#include <linux/errno.h>
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#include <linux/pci.h>
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#include <linux/delay.h>
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#include <asm/io.h>
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#include <typedefs.h>
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#include <osl.h>
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// #include <bcmutils.h>
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#include <bcmdevs.h>
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#include <bcmnvram.h>
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#include <sbutils.h>
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#include <sbconfig.h>
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#include <sbchipc.h>
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#include <sflash.h>
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#ifdef CONFIG_MTD_PARTITIONS
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extern struct mtd_partition * init_mtd_partitions(struct mtd_info *mtd, size_t size);
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#endif
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struct sflash_mtd {
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sb_t *sbh;
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chipcregs_t *cc;
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struct semaphore lock;
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struct mtd_info mtd;
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struct mtd_erase_region_info region;
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};
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/* Private global state */
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static struct sflash_mtd sflash;
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static int
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sflash_mtd_poll(struct sflash_mtd *sflash, unsigned int offset, int timeout)
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{
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int now = jiffies;
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int ret = 0;
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for (;;) {
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if (!sflash_poll(sflash->sbh, sflash->cc, offset)) {
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ret = 0;
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break;
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}
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if (time_after(jiffies, now + timeout)) {
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printk(KERN_ERR "sflash: timeout\n");
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ret = -ETIMEDOUT;
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break;
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}
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if (current->need_resched) {
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set_current_state(TASK_UNINTERRUPTIBLE);
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schedule_timeout(timeout / 10);
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} else
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udelay(1);
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}
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return ret;
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}
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static int
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sflash_mtd_read(struct mtd_info *mtd, loff_t from, size_t len, size_t *retlen, u_char *buf)
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{
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struct sflash_mtd *sflash = (struct sflash_mtd *) mtd->priv;
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int bytes, ret = 0;
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/* Check address range */
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if (len == 0){
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*retlen = 0;
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return 0;
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}
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if (!len)
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return 0;
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if ((from + len) > mtd->size)
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return -EINVAL;
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down(&sflash->lock);
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*retlen = 0;
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while (len) {
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if ((bytes = sflash_read(sflash->sbh, sflash->cc, (uint) from, len, buf)) < 0) {
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ret = bytes;
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break;
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}
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from += (loff_t) bytes;
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len -= bytes;
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buf += bytes;
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*retlen += bytes;
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}
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up(&sflash->lock);
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return ret;
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}
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static int
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sflash_mtd_write(struct mtd_info *mtd, loff_t to, size_t len, size_t *retlen, const u_char *buf)
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{
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struct sflash_mtd *sflash = (struct sflash_mtd *) mtd->priv;
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int bytes, ret = 0;
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/* Check address range */
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if (len == 0){
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*retlen = 0;
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return 0;
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}
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if (!len)
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return 0;
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if ((to + len) > mtd->size)
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return -EINVAL;
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down(&sflash->lock);
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*retlen = 0;
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while (len) {
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if ((bytes = sflash_write(sflash->sbh, sflash->cc, (uint)to, (uint)len, buf)) < 0) {
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ret = bytes;
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break;
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}
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if ((ret = sflash_mtd_poll(sflash, (unsigned int) to, HZ / 10)))
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break;
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to += (loff_t) bytes;
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len -= bytes;
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buf += bytes;
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*retlen += bytes;
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}
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up(&sflash->lock);
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return ret;
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}
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static int
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sflash_mtd_erase(struct mtd_info *mtd, struct erase_info *erase)
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{
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struct sflash_mtd *sflash = (struct sflash_mtd *) mtd->priv;
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int i, j, ret = 0;
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unsigned int addr, len;
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/* Check address range */
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if (!erase->len)
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return 0;
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if ((erase->addr + erase->len) > mtd->size)
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return -EINVAL;
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addr = erase->addr;
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len = erase->len;
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down(&sflash->lock);
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/* Ensure that requested region is aligned */
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for (i = 0; i < mtd->numeraseregions; i++) {
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for (j = 0; j < mtd->eraseregions[i].numblocks; j++) {
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if (addr == mtd->eraseregions[i].offset + mtd->eraseregions[i].erasesize * j &&
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len >= mtd->eraseregions[i].erasesize) {
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if ((ret = sflash_erase(sflash->sbh, sflash->cc, addr)) < 0)
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break;
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if ((ret = sflash_mtd_poll(sflash, addr, 10 * HZ)))
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break;
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addr += mtd->eraseregions[i].erasesize;
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len -= mtd->eraseregions[i].erasesize;
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}
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}
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if (ret)
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break;
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}
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up(&sflash->lock);
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/* Set erase status */
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if (ret)
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erase->state = MTD_ERASE_FAILED;
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else
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erase->state = MTD_ERASE_DONE;
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/* Call erase callback */
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if (erase->callback)
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erase->callback(erase);
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return ret;
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}
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#if LINUX_VERSION_CODE < 0x20212 && defined(MODULE)
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#define sflash_mtd_init init_module
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#define sflash_mtd_exit cleanup_module
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#endif
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mod_init_t
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sflash_mtd_init(void)
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{
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struct pci_dev *pdev;
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int ret = 0;
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struct sflash *info;
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uint i;
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#ifdef CONFIG_MTD_PARTITIONS
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struct mtd_partition *parts;
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#endif
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if (!(pdev = pci_find_device(VENDOR_BROADCOM, SB_CC, NULL))) {
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printk(KERN_ERR "sflash: chipcommon not found\n");
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return -ENODEV;
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}
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memset(&sflash, 0, sizeof(struct sflash_mtd));
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init_MUTEX(&sflash.lock);
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/* attach to the backplane */
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if (!(sflash.sbh = sb_kattach(SB_OSH))) {
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printk(KERN_ERR "sflash: error attaching to backplane\n");
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ret = -EIO;
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goto fail;
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}
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/* Map registers and flash base */
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if (!(sflash.cc = ioremap_nocache(pci_resource_start(pdev, 0),
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pci_resource_len(pdev, 0)))) {
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printk(KERN_ERR "sflash: error mapping registers\n");
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ret = -EIO;
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goto fail;
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}
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/* Initialize serial flash access */
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if (!(info = sflash_init(sflash.sbh, sflash.cc))) {
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printk(KERN_ERR "sflash: found no supported devices\n");
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ret = -ENODEV;
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goto fail;
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}
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printk(KERN_INFO "sflash: found serial flash; blocksize=%dKB, numblocks=%d, size=%dKB\n",info->blocksize/1024,info->numblocks,info->size/1024);
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/* Setup region info */
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sflash.region.offset = 0;
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sflash.region.erasesize = info->blocksize;
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sflash.region.numblocks = info->numblocks;
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if (sflash.region.erasesize > sflash.mtd.erasesize)
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sflash.mtd.erasesize = sflash.region.erasesize;
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sflash.mtd.size = info->size;
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sflash.mtd.numeraseregions = 1;
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/* Register with MTD */
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sflash.mtd.name = "sflash";
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sflash.mtd.type = MTD_NORFLASH;
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sflash.mtd.flags = MTD_CAP_NORFLASH;
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sflash.mtd.eraseregions = &sflash.region;
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sflash.mtd.module = THIS_MODULE;
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sflash.mtd.erase = sflash_mtd_erase;
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sflash.mtd.read = sflash_mtd_read;
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sflash.mtd.write = sflash_mtd_write;
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sflash.mtd.priv = &sflash;
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#ifdef CONFIG_MTD_PARTITIONS
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parts = init_mtd_partitions(&sflash.mtd, sflash.mtd.size);
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for (i = 0; parts[i].name; i++);
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ret = add_mtd_partitions(&sflash.mtd, parts, i);
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#else
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ret = add_mtd_device(&sflash.mtd);
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#endif
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if (ret) {
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printk(KERN_ERR "sflash: add_mtd failed\n");
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goto fail;
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}
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return 0;
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fail:
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if (sflash.cc)
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iounmap((void *) sflash.cc);
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if (sflash.sbh)
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sb_detach(sflash.sbh);
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return ret;
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}
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mod_exit_t
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sflash_mtd_exit(void)
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{
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#ifdef CONFIG_MTD_PARTITIONS
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del_mtd_partitions(&sflash.mtd);
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#else
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del_mtd_device(&sflash.mtd);
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#endif
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iounmap((void *) sflash.cc);
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sb_detach(sflash.sbh);
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}
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module_init(sflash_mtd_init);
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module_exit(sflash_mtd_exit);
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