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mtd: phram: Allow probing via reserved-memory

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Allow phram to be probed from the devicetree.  It expects to be in a
reserved-memory node as documented by the bindings.  This allows things
like partitioning to be specified via the devicetree.

Signed-off-by: Vincent Whitchurch <vincent.whitchurch@axis.com>
Acked-by: Rob Herring <robh@kernel.org>
Signed-off-by: Miquel Raynal <miquel.raynal@bootlin.com>
Link: https://lore.kernel.org/linux-mtd/20220412135302.1682890-4-vincent.whitchurch@axis.com
This commit is contained in:
Vincent Whitchurch 2022-04-12 15:53:01 +02:00 committed by Miquel Raynal
parent 4e96945960
commit 7090d2f1d6
2 changed files with 64 additions and 4 deletions
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67
drivers/mtd/devices/phram.c
View File

@ -27,6 +27,9 @@
#include <linux/slab.h>
#include <linux/mtd/mtd.h>
#include <asm/div64.h>
#include <linux/platform_device.h>
#include <linux/of_address.h>
#include <linux/of.h>
struct phram_mtd_list {
struct mtd_info mtd;
@ -89,8 +92,10 @@ static void unregister_devices(void)
}
}
static int register_device(char *name, phys_addr_t start, size_t len, uint32_t erasesize)
static int register_device(struct platform_device *pdev, const char *name,
phys_addr_t start, size_t len, uint32_t erasesize)
{
struct device_node *np = pdev ? pdev->dev.of_node : NULL;
struct phram_mtd_list *new;
int ret = -ENOMEM;
@ -119,13 +124,19 @@ static int register_device(char *name, phys_addr_t start, size_t len, uint32_t e
new->mtd.erasesize = erasesize;
new->mtd.writesize = 1;
mtd_set_of_node(&new->mtd, np);
ret = -EAGAIN;
if (mtd_device_register(&new->mtd, NULL, 0)) {
pr_err("Failed to register new device\n");
goto out2;
}
list_add_tail(&new->list, &phram_list);
if (pdev)
platform_set_drvdata(pdev, new);
else
list_add_tail(&new->list, &phram_list);
return 0;
out2:
@ -278,7 +289,7 @@ static int phram_setup(const char *val)
goto error;
}
ret = register_device(name, start, len, (uint32_t)erasesize);
ret = register_device(NULL, name, start, len, (uint32_t)erasesize);
if (ret)
goto error;
@ -325,10 +336,54 @@ static int phram_param_call(const char *val, const struct kernel_param *kp)
module_param_call(phram, phram_param_call, NULL, NULL, 0200);
MODULE_PARM_DESC(phram, "Memory region to map. \"phram=<name>,<start>,<length>[,<erasesize>]\"");
#ifdef CONFIG_OF
static const struct of_device_id phram_of_match[] = {
{ .compatible = "phram" },
{}
};
MODULE_DEVICE_TABLE(of, phram_of_match);
#endif
static int phram_probe(struct platform_device *pdev)
{
struct resource *res;
res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
if (!res)
return -ENOMEM;
/* mtd_set_of_node() reads name from "label" */
return register_device(pdev, NULL, res->start, resource_size(res),
PAGE_SIZE);
}
static int phram_remove(struct platform_device *pdev)
{
struct phram_mtd_list *phram = platform_get_drvdata(pdev);
mtd_device_unregister(&phram->mtd);
iounmap(phram->mtd.priv);
kfree(phram);
return 0;
}
static struct platform_driver phram_driver = {
.probe = phram_probe,
.remove = phram_remove,
.driver = {
.name = "phram",
.of_match_table = of_match_ptr(phram_of_match),
},
};
static int __init init_phram(void)
{
int ret = 0;
int ret;
ret = platform_driver_register(&phram_driver);
if (ret)
return ret;
#ifndef MODULE
if (phram_paramline[0])
@ -336,12 +391,16 @@ static int __init init_phram(void)
phram_init_called = 1;
#endif
if (ret)
platform_driver_unregister(&phram_driver);
return ret;
}
static void __exit cleanup_phram(void)
{
unregister_devices();
platform_driver_unregister(&phram_driver);
}
module_init(init_phram);

1
drivers/of/platform.c
View File

@ -509,6 +509,7 @@ EXPORT_SYMBOL_GPL(of_platform_default_populate);
#ifndef CONFIG_PPC
static const struct of_device_id reserved_mem_matches[] = {
{ .compatible = "phram" },
{ .compatible = "qcom,rmtfs-mem" },
{ .compatible = "qcom,cmd-db" },
{ .compatible = "qcom,smem" },