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Message-Id: <1452991370-20121-1-git-send-email-zajec5@gmail.com>
Date: Sun, 17 Jan 2016 01:42:50 +0100
From: Rafał Miłecki <zajec5@...il.com>
To: Brian Norris <computersforpeace@...il.com>,
linux-mtd@...ts.infradead.org
Cc: "Maciej W. Rozycki" <macro@...ux-mips.org>,
Javier Martinez Canillas <javier@....samsung.com>,
Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
Fengguang Wu <fengguang.wu@...el.com>,
Michael Ellerman <mpe@...erman.id.au>,
Luis de Bethencourt <luisbg@....samsung.com>,
Jeremy Kerr <jk@...abs.org>,
Neelesh Gupta <neelegup@...ux.vnet.ibm.com>,
David Woodhouse <dwmw2@...radead.org>,
Cyril Bur <cyrilbur@...il.com>,
Ralf Baechle <ralf@...ux-mips.org>,
Rafał Miłecki <zajec5@...il.com>
Subject: [PATCH] mtd: bcm47xxsflash: use ioremap_cachable() instead of KSEG0ADDR()
From: Brian Norris <computersforpeace@...il.com>
Using KSEG0ADDR makes code highly MIPS dependent and not portable.
Ideally we should use ioremap_cache which is generic but right now MIPS
doesn't define it which results in kernel using ioremap instead.
Once MIPS gets ioremap_cache we will switch to it, it's going to be
trivial with this patch applied first.
KSEG0ADDR was translating 0x1c000000 into 0x9c000000. With
ioremap_cachable we use MIPS's __ioremap (and 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.
Moreover drivers/bcma/driver_chipcommon_sflash.c nicely sets us up a
struct resource for access window, but we just aren't using it. Use it
now and drop duplicated info.
Signed-off-by: Brian Norris <computersforpeace@...il.com>
Signed-off-by: Rafał Miłecki <zajec5@...il.com>
---
drivers/bcma/driver_chipcommon_sflash.c | 1 -
drivers/mtd/devices/bcm47xxsflash.c | 28 +++++++++++++++++++++++-----
drivers/mtd/devices/bcm47xxsflash.h | 3 ++-
include/linux/bcma/bcma_driver_chipcommon.h | 1 -
4 files changed, 25 insertions(+), 8 deletions(-)
diff --git a/drivers/bcma/driver_chipcommon_sflash.c b/drivers/bcma/driver_chipcommon_sflash.c
index 7e11ef4..5534cbc 100644
--- a/drivers/bcma/driver_chipcommon_sflash.c
+++ b/drivers/bcma/driver_chipcommon_sflash.c
@@ -145,7 +145,6 @@ int bcma_sflash_init(struct bcma_drv_cc *cc)
return -ENOTSUPP;
}
- sflash->window = BCMA_SOC_FLASH2;
sflash->blocksize = e->blocksize;
sflash->numblocks = e->numblocks;
sflash->size = sflash->blocksize * sflash->numblocks;
diff --git a/drivers/mtd/devices/bcm47xxsflash.c b/drivers/mtd/devices/bcm47xxsflash.c
index 347bb83..84f8fae 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_cachable(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;
@@ -321,6 +338,7 @@ static int bcm47xxsflash_bcma_remove(struct platform_device *pdev)
struct bcm47xxsflash *b47s = sflash->priv;
mtd_device_unregister(&b47s->mtd);
+ iounmap(b47s->window);
return 0;
}
diff --git a/drivers/mtd/devices/bcm47xxsflash.h b/drivers/mtd/devices/bcm47xxsflash.h
index fe93daf..1564b62 100644
--- a/drivers/mtd/devices/bcm47xxsflash.h
+++ b/drivers/mtd/devices/bcm47xxsflash.h
@@ -65,7 +65,8 @@ struct bcm47xxsflash {
enum bcm47xxsflash_type type;
- u32 window;
+ void __iomem *window;
+
u32 blocksize;
u16 numblocks;
u32 size;
diff --git a/include/linux/bcma/bcma_driver_chipcommon.h b/include/linux/bcma/bcma_driver_chipcommon.h
index db51a6f..03e6fea 100644
--- a/include/linux/bcma/bcma_driver_chipcommon.h
+++ b/include/linux/bcma/bcma_driver_chipcommon.h
@@ -583,7 +583,6 @@ struct mtd_info;
struct bcma_sflash {
bool present;
- u32 window;
u32 blocksize;
u16 numblocks;
u32 size;
--
1.8.4.5
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