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