mirror of https://gitee.com/openkylin/linux.git
303 lines
6.4 KiB
C
303 lines
6.4 KiB
C
/*
|
|
* Flash memory access on SA11x0 based devices
|
|
*
|
|
* (C) 2000 Nicolas Pitre <nico@fluxnic.net>
|
|
*/
|
|
#include <linux/module.h>
|
|
#include <linux/types.h>
|
|
#include <linux/ioport.h>
|
|
#include <linux/kernel.h>
|
|
#include <linux/init.h>
|
|
#include <linux/errno.h>
|
|
#include <linux/slab.h>
|
|
#include <linux/platform_device.h>
|
|
#include <linux/err.h>
|
|
#include <linux/io.h>
|
|
|
|
#include <linux/mtd/mtd.h>
|
|
#include <linux/mtd/map.h>
|
|
#include <linux/mtd/partitions.h>
|
|
#include <linux/mtd/concat.h>
|
|
|
|
#include <mach/hardware.h>
|
|
#include <asm/sizes.h>
|
|
#include <asm/mach/flash.h>
|
|
|
|
struct sa_subdev_info {
|
|
char name[16];
|
|
struct map_info map;
|
|
struct mtd_info *mtd;
|
|
struct flash_platform_data *plat;
|
|
};
|
|
|
|
struct sa_info {
|
|
struct mtd_info *mtd;
|
|
int num_subdev;
|
|
struct sa_subdev_info subdev[0];
|
|
};
|
|
|
|
static DEFINE_SPINLOCK(sa1100_vpp_lock);
|
|
static int sa1100_vpp_refcnt;
|
|
static void sa1100_set_vpp(struct map_info *map, int on)
|
|
{
|
|
struct sa_subdev_info *subdev = container_of(map, struct sa_subdev_info, map);
|
|
unsigned long flags;
|
|
|
|
spin_lock_irqsave(&sa1100_vpp_lock, flags);
|
|
if (on) {
|
|
if (++sa1100_vpp_refcnt == 1) /* first nested 'on' */
|
|
subdev->plat->set_vpp(1);
|
|
} else {
|
|
if (--sa1100_vpp_refcnt == 0) /* last nested 'off' */
|
|
subdev->plat->set_vpp(0);
|
|
}
|
|
spin_unlock_irqrestore(&sa1100_vpp_lock, flags);
|
|
}
|
|
|
|
static void sa1100_destroy_subdev(struct sa_subdev_info *subdev)
|
|
{
|
|
if (subdev->mtd)
|
|
map_destroy(subdev->mtd);
|
|
if (subdev->map.virt)
|
|
iounmap(subdev->map.virt);
|
|
release_mem_region(subdev->map.phys, subdev->map.size);
|
|
}
|
|
|
|
static int sa1100_probe_subdev(struct sa_subdev_info *subdev, struct resource *res)
|
|
{
|
|
unsigned long phys;
|
|
unsigned int size;
|
|
int ret;
|
|
|
|
phys = res->start;
|
|
size = res->end - phys + 1;
|
|
|
|
/*
|
|
* Retrieve the bankwidth from the MSC registers.
|
|
* We currently only implement CS0 and CS1 here.
|
|
*/
|
|
switch (phys) {
|
|
default:
|
|
printk(KERN_WARNING "SA1100 flash: unknown base address "
|
|
"0x%08lx, assuming CS0\n", phys);
|
|
|
|
case SA1100_CS0_PHYS:
|
|
subdev->map.bankwidth = (MSC0 & MSC_RBW) ? 2 : 4;
|
|
break;
|
|
|
|
case SA1100_CS1_PHYS:
|
|
subdev->map.bankwidth = ((MSC0 >> 16) & MSC_RBW) ? 2 : 4;
|
|
break;
|
|
}
|
|
|
|
if (!request_mem_region(phys, size, subdev->name)) {
|
|
ret = -EBUSY;
|
|
goto out;
|
|
}
|
|
|
|
if (subdev->plat->set_vpp)
|
|
subdev->map.set_vpp = sa1100_set_vpp;
|
|
|
|
subdev->map.phys = phys;
|
|
subdev->map.size = size;
|
|
subdev->map.virt = ioremap(phys, size);
|
|
if (!subdev->map.virt) {
|
|
ret = -ENOMEM;
|
|
goto err;
|
|
}
|
|
|
|
simple_map_init(&subdev->map);
|
|
|
|
/*
|
|
* Now let's probe for the actual flash. Do it here since
|
|
* specific machine settings might have been set above.
|
|
*/
|
|
subdev->mtd = do_map_probe(subdev->plat->map_name, &subdev->map);
|
|
if (subdev->mtd == NULL) {
|
|
ret = -ENXIO;
|
|
goto err;
|
|
}
|
|
subdev->mtd->owner = THIS_MODULE;
|
|
|
|
printk(KERN_INFO "SA1100 flash: CFI device at 0x%08lx, %uMiB, %d-bit\n",
|
|
phys, (unsigned)(subdev->mtd->size >> 20),
|
|
subdev->map.bankwidth * 8);
|
|
|
|
return 0;
|
|
|
|
err:
|
|
sa1100_destroy_subdev(subdev);
|
|
out:
|
|
return ret;
|
|
}
|
|
|
|
static void sa1100_destroy(struct sa_info *info, struct flash_platform_data *plat)
|
|
{
|
|
int i;
|
|
|
|
if (info->mtd) {
|
|
mtd_device_unregister(info->mtd);
|
|
if (info->mtd != info->subdev[0].mtd)
|
|
mtd_concat_destroy(info->mtd);
|
|
}
|
|
|
|
for (i = info->num_subdev - 1; i >= 0; i--)
|
|
sa1100_destroy_subdev(&info->subdev[i]);
|
|
kfree(info);
|
|
|
|
if (plat->exit)
|
|
plat->exit();
|
|
}
|
|
|
|
static struct sa_info *sa1100_setup_mtd(struct platform_device *pdev,
|
|
struct flash_platform_data *plat)
|
|
{
|
|
struct sa_info *info;
|
|
int nr, size, i, ret = 0;
|
|
|
|
/*
|
|
* Count number of devices.
|
|
*/
|
|
for (nr = 0; ; nr++)
|
|
if (!platform_get_resource(pdev, IORESOURCE_MEM, nr))
|
|
break;
|
|
|
|
if (nr == 0) {
|
|
ret = -ENODEV;
|
|
goto out;
|
|
}
|
|
|
|
size = sizeof(struct sa_info) + sizeof(struct sa_subdev_info) * nr;
|
|
|
|
/*
|
|
* Allocate the map_info structs in one go.
|
|
*/
|
|
info = kzalloc(size, GFP_KERNEL);
|
|
if (!info) {
|
|
ret = -ENOMEM;
|
|
goto out;
|
|
}
|
|
|
|
if (plat->init) {
|
|
ret = plat->init();
|
|
if (ret)
|
|
goto err;
|
|
}
|
|
|
|
/*
|
|
* Claim and then map the memory regions.
|
|
*/
|
|
for (i = 0; i < nr; i++) {
|
|
struct sa_subdev_info *subdev = &info->subdev[i];
|
|
struct resource *res;
|
|
|
|
res = platform_get_resource(pdev, IORESOURCE_MEM, i);
|
|
if (!res)
|
|
break;
|
|
|
|
subdev->map.name = subdev->name;
|
|
sprintf(subdev->name, "%s-%d", plat->name, i);
|
|
subdev->plat = plat;
|
|
|
|
ret = sa1100_probe_subdev(subdev, res);
|
|
if (ret)
|
|
break;
|
|
}
|
|
|
|
info->num_subdev = i;
|
|
|
|
/*
|
|
* ENXIO is special. It means we didn't find a chip when we probed.
|
|
*/
|
|
if (ret != 0 && !(ret == -ENXIO && info->num_subdev > 0))
|
|
goto err;
|
|
|
|
/*
|
|
* If we found one device, don't bother with concat support. If
|
|
* we found multiple devices, use concat if we have it available,
|
|
* otherwise fail. Either way, it'll be called "sa1100".
|
|
*/
|
|
if (info->num_subdev == 1) {
|
|
strcpy(info->subdev[0].name, plat->name);
|
|
info->mtd = info->subdev[0].mtd;
|
|
ret = 0;
|
|
} else if (info->num_subdev > 1) {
|
|
struct mtd_info *cdev[nr];
|
|
/*
|
|
* We detected multiple devices. Concatenate them together.
|
|
*/
|
|
for (i = 0; i < info->num_subdev; i++)
|
|
cdev[i] = info->subdev[i].mtd;
|
|
|
|
info->mtd = mtd_concat_create(cdev, info->num_subdev,
|
|
plat->name);
|
|
if (info->mtd == NULL)
|
|
ret = -ENXIO;
|
|
}
|
|
|
|
if (ret == 0)
|
|
return info;
|
|
|
|
err:
|
|
sa1100_destroy(info, plat);
|
|
out:
|
|
return ERR_PTR(ret);
|
|
}
|
|
|
|
static const char * const part_probes[] = { "cmdlinepart", "RedBoot", NULL };
|
|
|
|
static int sa1100_mtd_probe(struct platform_device *pdev)
|
|
{
|
|
struct flash_platform_data *plat = pdev->dev.platform_data;
|
|
struct sa_info *info;
|
|
int err;
|
|
|
|
if (!plat)
|
|
return -ENODEV;
|
|
|
|
info = sa1100_setup_mtd(pdev, plat);
|
|
if (IS_ERR(info)) {
|
|
err = PTR_ERR(info);
|
|
goto out;
|
|
}
|
|
|
|
/*
|
|
* Partition selection stuff.
|
|
*/
|
|
mtd_device_parse_register(info->mtd, part_probes, NULL, plat->parts,
|
|
plat->nr_parts);
|
|
|
|
platform_set_drvdata(pdev, info);
|
|
err = 0;
|
|
|
|
out:
|
|
return err;
|
|
}
|
|
|
|
static int __exit sa1100_mtd_remove(struct platform_device *pdev)
|
|
{
|
|
struct sa_info *info = platform_get_drvdata(pdev);
|
|
struct flash_platform_data *plat = pdev->dev.platform_data;
|
|
|
|
platform_set_drvdata(pdev, NULL);
|
|
sa1100_destroy(info, plat);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static struct platform_driver sa1100_mtd_driver = {
|
|
.probe = sa1100_mtd_probe,
|
|
.remove = __exit_p(sa1100_mtd_remove),
|
|
.driver = {
|
|
.name = "sa1100-mtd",
|
|
.owner = THIS_MODULE,
|
|
},
|
|
};
|
|
|
|
module_platform_driver(sa1100_mtd_driver);
|
|
|
|
MODULE_AUTHOR("Nicolas Pitre");
|
|
MODULE_DESCRIPTION("SA1100 CFI map driver");
|
|
MODULE_LICENSE("GPL");
|
|
MODULE_ALIAS("platform:sa1100-mtd");
|