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mtd: Add armflash support for multiple blocks of flash
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This patch adds MTD concatenation support to integrator-flash.c for
platforms with more than one block of flash memory (e.g. RealView
PB11MPCore). The implementation is based on the sa1100-flash.c one.

Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
Acked-by: Russell King <rmk+kernel@arm.linux.org.uk>
Signed-off-by: David Woodhouse <David.Woodhouse@intel.com>
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Catalin Marinas authored and David Woodhouse committed May 29, 2009
1 parent 8d42b52 commit 9fd1e8f
Showing 1 changed file with 164 additions and 62 deletions.
226 changes: 164 additions & 62 deletions drivers/mtd/maps/integrator-flash.c
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Original file line number Diff line number Diff line change
Expand Up @@ -36,60 +36,51 @@
#include <linux/mtd/mtd.h>
#include <linux/mtd/map.h>
#include <linux/mtd/partitions.h>
#include <linux/mtd/concat.h>

#include <asm/mach/flash.h>
#include <mach/hardware.h>
#include <asm/system.h>

#ifdef CONFIG_ARCH_P720T
#define FLASH_BASE (0x04000000)
#define FLASH_SIZE (64*1024*1024)
#endif
#define SUBDEV_NAME_SIZE (BUS_ID_SIZE + 2)

struct armflash_info {
struct armflash_subdev_info {
char name[SUBDEV_NAME_SIZE];
struct mtd_info *mtd;
struct map_info map;
struct flash_platform_data *plat;
};

struct armflash_info {
struct resource *res;
struct mtd_partition *parts;
struct mtd_info *mtd;
struct map_info map;
int nr_subdev;
struct armflash_subdev_info subdev[0];
};

static void armflash_set_vpp(struct map_info *map, int on)
{
struct armflash_info *info = container_of(map, struct armflash_info, map);
struct armflash_subdev_info *info =
container_of(map, struct armflash_subdev_info, map);

if (info->plat && info->plat->set_vpp)
info->plat->set_vpp(on);
}

static const char *probes[] = { "cmdlinepart", "RedBoot", "afs", NULL };

static int armflash_probe(struct platform_device *dev)
static int armflash_subdev_probe(struct armflash_subdev_info *subdev,
struct resource *res)
{
struct flash_platform_data *plat = dev->dev.platform_data;
struct resource *res = dev->resource;
unsigned int size = res->end - res->start + 1;
struct armflash_info *info;
int err;
struct flash_platform_data *plat = subdev->plat;
resource_size_t size = res->end - res->start + 1;
void __iomem *base;
int err = 0;

info = kzalloc(sizeof(struct armflash_info), GFP_KERNEL);
if (!info) {
err = -ENOMEM;
goto out;
}

info->plat = plat;
if (plat && plat->init) {
err = plat->init();
if (err)
goto no_resource;
}

info->res = request_mem_region(res->start, size, "armflash");
if (!info->res) {
if (!request_mem_region(res->start, size, subdev->name)) {
err = -EBUSY;
goto no_resource;
goto out;
}

base = ioremap(res->start, size);
Expand All @@ -101,27 +92,132 @@ static int armflash_probe(struct platform_device *dev)
/*
* look for CFI based flash parts fitted to this board
*/
info->map.size = size;
info->map.bankwidth = plat->width;
info->map.phys = res->start;
info->map.virt = base;
info->map.name = dev_name(&dev->dev);
info->map.set_vpp = armflash_set_vpp;
subdev->map.size = size;
subdev->map.bankwidth = plat->width;
subdev->map.phys = res->start;
subdev->map.virt = base;
subdev->map.name = subdev->name;
subdev->map.set_vpp = armflash_set_vpp;

simple_map_init(&info->map);
simple_map_init(&subdev->map);

/*
* Also, the CFI layer automatically works out what size
* of chips we have, and does the necessary identification
* for us automatically.
*/
info->mtd = do_map_probe(plat->map_name, &info->map);
if (!info->mtd) {
subdev->mtd = do_map_probe(plat->map_name, &subdev->map);
if (!subdev->mtd) {
err = -ENXIO;
goto no_device;
}

info->mtd->owner = THIS_MODULE;
subdev->mtd->owner = THIS_MODULE;

/* Successful? */
if (err == 0)
return err;

if (subdev->mtd)
map_destroy(subdev->mtd);
no_device:
iounmap(base);
no_mem:
release_mem_region(res->start, size);
out:
return err;
}

static void armflash_subdev_remove(struct armflash_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 armflash_probe(struct platform_device *dev)
{
struct flash_platform_data *plat = dev->dev.platform_data;
unsigned int size;
struct armflash_info *info;
int i, nr, err;

/* Count the number of devices */
for (nr = 0; ; nr++)
if (!platform_get_resource(dev, IORESOURCE_MEM, nr))
break;
if (nr == 0) {
err = -ENODEV;
goto out;
}

size = sizeof(struct armflash_info) +
sizeof(struct armflash_subdev_info) * nr;
info = kzalloc(size, GFP_KERNEL);
if (!info) {
err = -ENOMEM;
goto out;
}

if (plat && plat->init) {
err = plat->init();
if (err)
goto no_resource;
}

for (i = 0; i < nr; i++) {
struct armflash_subdev_info *subdev = &info->subdev[i];
struct resource *res;

res = platform_get_resource(dev, IORESOURCE_MEM, i);
if (!res)
break;

if (nr == 1)
/* No MTD concatenation, just use the default name */
snprintf(subdev->name, SUBDEV_NAME_SIZE, "%s",
dev_name(&dev->dev));
else
snprintf(subdev->name, SUBDEV_NAME_SIZE, "%s-%d",
dev_name(&dev->dev), i);
subdev->plat = plat;

err = armflash_subdev_probe(subdev, res);
if (err)
break;
}
info->nr_subdev = i;

if (err)
goto subdev_err;

if (info->nr_subdev == 1)
info->mtd = info->subdev[0].mtd;
else if (info->nr_subdev > 1) {
#ifdef CONFIG_MTD_CONCAT
struct mtd_info *cdev[info->nr_subdev];

/*
* We detected multiple devices. Concatenate them together.
*/
for (i = 0; i < info->nr_subdev; i++)
cdev[i] = info->subdev[i].mtd;

info->mtd = mtd_concat_create(cdev, info->nr_subdev,
dev_name(&dev->dev));
if (info->mtd == NULL)
err = -ENXIO;
#else
printk(KERN_ERR "armflash: multiple devices found but "
"MTD concat support disabled.\n");
err = -ENXIO;
#endif
}

if (err < 0)
goto cleanup;

err = parse_mtd_partitions(info->mtd, probes, &info->parts, 0);
if (err > 0) {
Expand All @@ -131,51 +227,57 @@ static int armflash_probe(struct platform_device *dev)
"mtd partition registration failed: %d\n", err);
}

if (err == 0)
if (err == 0) {
platform_set_drvdata(dev, info);
return err;
}

/*
* If we got an error, free all resources.
* We got an error, free all resources.
*/
if (err < 0) {
if (info->mtd) {
del_mtd_partitions(info->mtd);
map_destroy(info->mtd);
}
kfree(info->parts);

no_device:
iounmap(base);
no_mem:
release_mem_region(res->start, size);
no_resource:
if (plat && plat->exit)
plat->exit();
kfree(info);
cleanup:
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
}
kfree(info->parts);
subdev_err:
for (i = info->nr_subdev - 1; i >= 0; i--)
armflash_subdev_remove(&info->subdev[i]);
no_resource:
if (plat && plat->exit)
plat->exit();
kfree(info);
out:
return err;
}

static int armflash_remove(struct platform_device *dev)
{
struct armflash_info *info = platform_get_drvdata(dev);
struct flash_platform_data *plat = dev->dev.platform_data;
int i;

platform_set_drvdata(dev, NULL);

if (info) {
if (info->mtd) {
del_mtd_partitions(info->mtd);
map_destroy(info->mtd);
#ifdef CONFIG_MTD_CONCAT
if (info->mtd != info->subdev[0].mtd)
mtd_concat_destroy(info->mtd);
#endif
}
kfree(info->parts);

iounmap(info->map.virt);
release_resource(info->res);
kfree(info->res);
for (i = info->nr_subdev - 1; i >= 0; i--)
armflash_subdev_remove(&info->subdev[i]);

if (info->plat && info->plat->exit)
info->plat->exit();
if (plat && plat->exit)
plat->exit();

kfree(info);
}
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