3bd69ad077
dev_request_mem_region doesn't work properly one some SoCs on which
PTR_ERR() values clash with valid return values from dev_request_mem_region.
Replace them with dev_request_mem_resource where possible.
This patch has been generated with the following semantic patch:
// <smpl>
@@
expression d;
expression n;
expression io;
identifier func;
@@
func(...) {
+struct resource *iores;
<+...
-io = dev_request_mem_region(d, n);
-if (IS_ERR(io)) {
+iores = dev_request_mem_resource(d, n);
+if (IS_ERR(iores)) {
...
- return PTR_ERR(io);
-}
+ return PTR_ERR(iores);
+}
+io = IOMEM(iores->start);
...+>
}
@@
expression d;
expression n;
expression io;
identifier func;
@@
func(...) {
+struct resource *iores;
<+...
-io = dev_request_mem_region(d, n);
-if (IS_ERR(io)) {
+iores = dev_request_mem_resource(d, n);
+if (IS_ERR(iores))
- return PTR_ERR(io);
-}
+ return PTR_ERR(iores);
+io = IOMEM(iores->start);
...+>
}
@@
expression d;
expression n;
expression io;
identifier func;
@@
func(...) {
+struct resource *iores;
<+...
-io = dev_request_mem_region(d, n);
-if (IS_ERR(io)) {
- ret = PTR_ERR(io);
+iores = dev_request_mem_resource(d, n);
+if (IS_ERR(iores)) {
+ ret = PTR_ERR(iores);
...
}
+io = IOMEM(iores->start);
...+>
}
@@
expression d;
expression n;
expression io;
identifier func;
@@
func(...) {
+struct resource *iores;
<+...
-io = dev_request_mem_region(d, n);
+iores = dev_request_mem_resource(d, n);
+if (IS_ERR(iores))
+ return PTR_ERR(iores);
+io = IOMEM(iores->start);
...+>
}
@@
identifier func;
@@
func(...) {
<+...
struct resource *iores;
-struct resource *iores;
...+>
}
// </smpl>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
125 lines
2.6 KiB
C
125 lines
2.6 KiB
C
/*
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* Author: Sebastian Block <basti@linux-source.de>
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* Copyright (c) 2014
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*
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* Some parts are based on mtdram.c found in Linux kernel
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* by Alexander Larsson <alex@cendio.se>
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* and Joern Engel <joern@wh.fh-wedel.de>.
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*
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* This code is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*
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*/
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#include <common.h>
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#include <environment.h>
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#include <errno.h>
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#include <init.h>
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#include <io.h>
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#include <linux/mtd/mtd.h>
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#include <malloc.h>
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#include <of.h>
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struct mtdram_priv_data {
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struct mtd_info mtd;
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void *base;
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};
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static int ram_erase(struct mtd_info *mtd, struct erase_info *instr)
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{
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memset((char *)mtd->priv + instr->addr, 0xff, instr->len);
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instr->state = MTD_ERASE_DONE;
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mtd_erase_callback(instr);
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return 0;
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}
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static int ram_write(struct mtd_info *mtd, loff_t to, size_t len, size_t *retlen, const u_char *buf)
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{
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memcpy((char*)mtd->priv + to, buf, len);
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*retlen = len;
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return 0;
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}
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static int ram_read(struct mtd_info *mtd, loff_t from, size_t len, size_t *retlen, u_char *buf)
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{
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memcpy(buf, mtd->priv + from, len);
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*retlen = len;
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return 0;
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}
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static int mtdram_probe(struct device_d *dev)
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{
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struct resource *iores;
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void __iomem *base;
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int device_id;
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struct mtd_info *mtd;
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struct resource *res;
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loff_t size;
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int ret = 0;
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mtd = xzalloc(sizeof(struct mtd_info));
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device_id = DEVICE_ID_SINGLE;
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if (dev->device_node) {
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const char *alias = of_alias_get(dev->device_node);
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if (alias)
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mtd->name = xstrdup(alias);
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}
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if (!mtd->name) {
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device_id = DEVICE_ID_DYNAMIC;
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mtd->name = "mtdram";
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}
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iores = dev_request_mem_resource(dev, 0);
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if (IS_ERR(iores)) {
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ret = PTR_ERR(iores);
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goto nobase;
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}
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base = IOMEM(iores->start);
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res = dev_get_resource(dev, IORESOURCE_MEM, 0);
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size = (unsigned long) resource_size(res);
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mtd->priv = base;
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mtd->type = MTD_RAM;
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mtd->writesize = 1;
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mtd->writebufsize = 64;
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mtd->flags = MTD_CAP_RAM;
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mtd->size = size;
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mtd->read = ram_read;
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mtd->write = ram_write;
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mtd->erase = ram_erase;
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mtd->erasesize = 1;
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mtd->parent = dev;
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ret = add_mtd_device(mtd, mtd->name, device_id);
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return ret;
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nobase:
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kfree(mtd);
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return ret;
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}
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static __maybe_unused struct of_device_id mtdram_dt_ids[] = {
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{
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.compatible = "mtd-ram",
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}, {
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/* sentinel */
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}
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};
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static struct driver_d mtdram_driver = {
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.name = "mtdram",
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.probe = mtdram_probe,
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.of_compatible = DRV_OF_COMPAT(mtdram_dt_ids),
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};
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device_platform_driver(mtdram_driver);
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MODULE_LICENSE("GPL");
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MODULE_AUTHOR("Sebastian Block");
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MODULE_DESCRIPTION("MTD RAM driver for NVRAMs");
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