summaryrefslogtreecommitdiff
path: root/drivers/mtd/devices/bcm47xxsflash.c
diff options
context:
space:
mode:
authorBrian Norris <computersforpeace@gmail.com>2016-02-26 11:50:28 +0100
committerBrian Norris <computersforpeace@gmail.com>2016-04-04 00:07:57 -0700
commit5651d6aaf489d1db48c253cf884b40214e91c2c5 (patch)
treeda4bc73c1d32f47829974ab4fce280d99f6e28bb /drivers/mtd/devices/bcm47xxsflash.c
parentfddcca5107051adf9e4481d2a79ae0616577fd2c (diff)
mtd: bcm47xxsflash: use ioremap_cache() instead of KSEG0ADDR()
Using KSEG0ADDR makes code highly MIPS dependent and not portable. Thanks to the fix a68f376 ("MIPS: io.h: Define `ioremap_cache'") we can use ioremap_cache which is generic and supported on MIPS as well now. KSEG0ADDR was translating 0x1c000000 into 0x9c000000. With ioremap_cache we use MIPS's __ioremap (and then remap_area_pages). This results in different address (e.g. 0xc0080000) but it still should be cached as expected and it was successfully tested with BCM47186B0. Other than that drivers/bcma/driver_chipcommon_sflash.c nicely setups a struct resource for access window, but we wren't using it. Use it now and drop duplicated info. Signed-off-by: Brian Norris <computersforpeace@gmail.com> Signed-off-by: Rafał Miłecki <zajec5@gmail.com>
Diffstat (limited to 'drivers/mtd/devices/bcm47xxsflash.c')
-rw-r--r--drivers/mtd/devices/bcm47xxsflash.c29
1 files changed, 24 insertions, 5 deletions
diff --git a/drivers/mtd/devices/bcm47xxsflash.c b/drivers/mtd/devices/bcm47xxsflash.c
index 347bb83db864..1c65c15b31a1 100644
--- a/drivers/mtd/devices/bcm47xxsflash.c
+++ b/drivers/mtd/devices/bcm47xxsflash.c
@@ -2,6 +2,7 @@
#include <linux/module.h>
#include <linux/slab.h>
#include <linux/delay.h>
+#include <linux/ioport.h>
#include <linux/mtd/mtd.h>
#include <linux/platform_device.h>
#include <linux/bcma/bcma.h>
@@ -109,8 +110,7 @@ static int bcm47xxsflash_read(struct mtd_info *mtd, loff_t from, size_t len,
if ((from + len) > mtd->size)
return -EINVAL;
- memcpy_fromio(buf, (void __iomem *)KSEG0ADDR(b47s->window + from),
- len);
+ memcpy_fromio(buf, b47s->window + from, len);
*retlen = len;
return len;
@@ -275,15 +275,33 @@ static void bcm47xxsflash_bcma_cc_write(struct bcm47xxsflash *b47s, u16 offset,
static int bcm47xxsflash_bcma_probe(struct platform_device *pdev)
{
- struct bcma_sflash *sflash = dev_get_platdata(&pdev->dev);
+ struct device *dev = &pdev->dev;
+ struct bcma_sflash *sflash = dev_get_platdata(dev);
struct bcm47xxsflash *b47s;
+ struct resource *res;
int err;
- b47s = devm_kzalloc(&pdev->dev, sizeof(*b47s), GFP_KERNEL);
+ b47s = devm_kzalloc(dev, sizeof(*b47s), GFP_KERNEL);
if (!b47s)
return -ENOMEM;
sflash->priv = b47s;
+ res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+ if (!res) {
+ dev_err(dev, "invalid resource\n");
+ return -EINVAL;
+ }
+ if (!devm_request_mem_region(dev, res->start, resource_size(res),
+ res->name)) {
+ dev_err(dev, "can't request region for resource %pR\n", res);
+ return -EBUSY;
+ }
+ b47s->window = ioremap_cache(res->start, resource_size(res));
+ if (!b47s->window) {
+ dev_err(dev, "ioremap failed for resource %pR\n", res);
+ return -ENOMEM;
+ }
+
b47s->bcma_cc = container_of(sflash, struct bcma_drv_cc, sflash);
b47s->cc_read = bcm47xxsflash_bcma_cc_read;
b47s->cc_write = bcm47xxsflash_bcma_cc_write;
@@ -297,7 +315,6 @@ static int bcm47xxsflash_bcma_probe(struct platform_device *pdev)
break;
}
- b47s->window = sflash->window;
b47s->blocksize = sflash->blocksize;
b47s->numblocks = sflash->numblocks;
b47s->size = sflash->size;
@@ -306,6 +323,7 @@ static int bcm47xxsflash_bcma_probe(struct platform_device *pdev)
err = mtd_device_parse_register(&b47s->mtd, probes, NULL, NULL, 0);
if (err) {
pr_err("Failed to register MTD device: %d\n", err);
+ iounmap(b47s->window);
return err;
}
@@ -321,6 +339,7 @@ static int bcm47xxsflash_bcma_remove(struct platform_device *pdev)
struct bcm47xxsflash *b47s = sflash->priv;
mtd_device_unregister(&b47s->mtd);
+ iounmap(b47s->window);
return 0;
}