/*
* Flash memory access on SA11x0 based devices
*
* (C) 2000 Nicolas Pitre <nico@cam.org>
*
* $Id: sa1100-flash.c,v 1.47 2004/11/01 13:44:36 rmk Exp $
*/
#include <linux/config.h>
#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/device.h>
#include <linux/err.h>
#include <linux/mtd/mtd.h>
#include <linux/mtd/map.h>
#include <linux/mtd/partitions.h>
#include <linux/mtd/concat.h>
#include <asm/io.h>
#include <asm/sizes.h>
#include <asm/mach/flash.h>
#if 0
/*
* This is here for documentation purposes only - until these people
* submit their machine types. It will be gone January 2005.
*/
static struct mtd_partition consus_partitions[] = {
{
.name = "Consus boot firmware",
.offset = 0,
.size = 0x00040000,
.mask_flags = MTD_WRITABLE, /* force read-only */
}, {
.name = "Consus kernel",
.offset = 0x00040000,
.size = 0x00100000,
.mask_flags = 0,
}, {
.name = "Consus disk",
.offset = 0x00140000,
/* The rest (up to 16M) for jffs. We could put 0 and
make it find the size automatically, but right now
i have 32 megs. jffs will use all 32 megs if given
the chance, and this leads to horrible problems
when you try to re-flash the image because blob
won't erase the whole partition. */
.size = 0x01000000 - 0x00140000,
.mask_flags = 0,
}, {
/* this disk is a secondary disk, which can be used as
needed, for simplicity, make it the size of the other
consus partition, although realistically it could be
the remainder of the disk (depending on the file
system used) */
.name = "Consus disk2",
.offset = 0x01000000,
.size = 0x01000000 - 0x00140000,
.mask_flags = 0,
}
};
/* Frodo has 2 x 16M 28F128J3A flash chips in bank 0: */
static struct mtd_partition frodo_partitions[] =
{
{
.name = "bootloader",
.size = 0x00040000,
.offset = 0x00000000,
.mask_flags = MTD_WRITEABLE
}, {
.name = "bootloader params",
.size = 0x00040000,
.offset = MTDPART_OFS_APPEND,
.mask_flags = MTD_WRITEABLE
}, {
.name = "kernel",
.size = 0x00100000,
.offset = MTDPART_OFS_APPEND,
.mask_flags = MTD_WRITEABLE
}, {
.name = "ramdisk",
.size = 0x00400000,
.offset = MTDPART_OFS_APPEND,
.mask_flags = MTD_WRITEABLE
}, {
.name = "file system",
.size = MTDPART_SIZ_FULL,
.offset = MTDPART_OFS_APPEND
}
};
static struct mtd_partition jornada56x_partitions[] = {
{
.name = "bootldr",
.size = 0x00040000,
.offset = 0,
.mask_flags = MTD_WRITEABLE,
}, {
.name = "rootfs",
.size = MTDPART_SIZ_FULL,
.offset = MTDPART_OFS_APPEND,
}
};
static void jornada56x_set_vpp(int vpp)
{
if (vpp)
GPSR = GPIO_GPIO26;
else
GPCR = GPIO_GPIO26;
GPDR |= GPIO_GPIO26;
}
/*
* Machine Phys Size set_vpp
* Consus : SA1100_CS0_PHYS SZ_32M
* Frodo : SA1100_CS0_PHYS SZ_32M
* Jornada56x: SA1100_CS0_PHYS SZ_32M jornada56x_set_vpp
*/
#endif
struct sa_subdev_info {
char name[16];
struct map_info map;
struct mtd_info *mtd;
struct flash_platform_data *data;
};
struct sa_info {
struct mtd_partition *parts;
struct mtd_info *mtd;
int num_subdev;
struct sa_subdev_info subdev[0];
};
static void sa1100_set_vpp(struct map_info *map, int on)
{
struct sa_subdev_info *subdev = container_of(map, struct sa_subdev_info, map);
subdev->data->set_vpp(on);
}
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->data->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->data->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, %dMiB, "
"%d-bit\n", phys, 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)
{
int i;
if (info->mtd) {
del_mtd_partitions(info->mtd);
#ifdef CONFIG_MTD_CONCAT
if (info->mtd != info->subdev[0].mtd)
mtd_concat_destroy(info->mtd);
#endif
}
if (info->parts)
kfree(info->parts);
for (i = info->num_subdev - 1; i >= 0; i--)
sa1100_destroy_subdev(&info->subdev[i]);
kfree(info);
}
static struct sa_info *__init
sa1100_setup_mtd(struct platform_device *pdev, struct flash_platform_data *flash)
{
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 = kmalloc(size, GFP_KERNEL);
if (!info) {
ret = -ENOMEM;
goto out;
}
memset(info, 0, size);
/*
* 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, "sa1100-%d", i);
subdev->data = flash;
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, "sa1100");
info->mtd = info->subdev[0].mtd;
ret = 0;
} else if (info->num_subdev > 1) {
#ifdef CONFIG_MTD_CONCAT
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,
"sa1100");
if (info->mtd == NULL)
ret = -ENXIO;
#else
printk(KERN_ERR "SA1100 flash: multiple devices "
"found but MTD concat support disabled.\n");
ret = -ENXIO;
#endif
}
if (ret == 0)
return info;
err:
sa1100_destroy(info);
out:
return ERR_PTR(ret);
}
static const char *part_probes[] = { "cmdlinepart", "RedBoot", NULL };
static int __init sa1100_mtd_probe(struct device *dev)
{
struct platform_device *pdev = to_platform_device(dev);
struct flash_platform_data *flash = pdev->dev.platform_data;
struct mtd_partition *parts;
const char *part_type = NULL;
struct sa_info *info;
int err, nr_parts = 0;
if (!flash)
return -ENODEV;
info = sa1100_setup_mtd(pdev, flash);
if (IS_ERR(info)) {
err = PTR_ERR(info);
goto out;
}
/*
* Partition selection stuff.
*/
#ifdef CONFIG_MTD_PARTITIONS
nr_parts = parse_mtd_partitions(info->mtd, part_probes, &parts, 0);
if (nr_parts > 0) {
info->parts = parts;
part_type = "dynamic";
} else
#endif
{
parts = flash->parts;
nr_parts = flash->nr_parts;
part_type = "static";
}
if (nr_parts == 0) {
printk(KERN_NOTICE "SA1100 flash: no partition info "
"available, registering whole flash\n");
add_mtd_device(info->mtd);
} else {
printk(KERN_NOTICE "SA1100 flash: using %s partition "
"definition\n", part_type);
add_mtd_partitions(info->mtd, parts, nr_parts);
}
dev_set_drvdata(dev, info);
err = 0;
out:
return err;
}
static int __exit sa1100_mtd_remove(struct device *dev)
{
struct sa_info *info = dev_get_drvdata(dev);
dev_set_drvdata(dev, NULL);
sa1100_destroy(info);
return 0;
}
#ifdef CONFIG_PM
static int sa1100_mtd_suspend(struct device *dev, pm_message_t state)
{
struct sa_info *info = dev_get_drvdata(dev);
int ret = 0;
if (info)
ret = info->mtd->suspend(info->mtd);
return ret;
}
static int sa1100_mtd_resume(struct device *dev)
{
struct sa_info *info = dev_get_drvdata(dev);
if (info)
info->mtd->resume(info->mtd);
return 0;
}
#else
#define sa1100_mtd_suspend NULL
#define sa1100_mtd_resume NULL
#endif
static struct device_driver sa1100_mtd_driver = {
.name = "flash",
.bus = &platform_bus_type,
.probe = sa1100_mtd_probe,
.remove = __exit_p(sa1100_mtd_remove),
.suspend = sa1100_mtd_suspend,
.resume = sa1100_mtd_resume,
};
static int __init sa1100_mtd_init(void)
{
return driver_register(&sa1100_mtd_driver);
}
static void __exit sa1100_mtd_exit(void)
{
driver_unregister(&sa1100_mtd_driver);
}
module_init(sa1100_mtd_init);
module_exit(sa1100_mtd_exit);
MODULE_AUTHOR("Nicolas Pitre");
MODULE_DESCRIPTION("SA1100 CFI map driver");
MODULE_LICENSE("GPL");
