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authorRafał Miłecki <zajec5@gmail.com>2016-04-15 10:11:44 +0000
committerRafał Miłecki <zajec5@gmail.com>2016-04-15 10:11:44 +0000
commite920824fdd8488a9659b9839feebe015362de6c2 (patch)
tree76760aae076d0d23d2ccec70d3d739628770a934 /target/linux/generic
parent490861a3f5d93e7cec274bce67bad56c909c09a8 (diff)
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kernel: backport patch making bcm47xxsflash arch independent
This will be needed to use bcm47xxsflash on ARM for BCM53573. Signed-off-by: Rafał Miłecki <zajec5@gmail.com> SVN-Revision: 49168
Diffstat (limited to 'target/linux/generic')
-rw-r--r--target/linux/generic/patches-4.4/042-mtd-bcm47xxsflash-use-ioremap_cache-instead-of-KSEG0.patch138
1 files changed, 138 insertions, 0 deletions
diff --git a/target/linux/generic/patches-4.4/042-mtd-bcm47xxsflash-use-ioremap_cache-instead-of-KSEG0.patch b/target/linux/generic/patches-4.4/042-mtd-bcm47xxsflash-use-ioremap_cache-instead-of-KSEG0.patch
new file mode 100644
index 0000000..a401e55
--- /dev/null
+++ b/target/linux/generic/patches-4.4/042-mtd-bcm47xxsflash-use-ioremap_cache-instead-of-KSEG0.patch
@@ -0,0 +1,138 @@
+From 5651d6aaf489d1db48c253cf884b40214e91c2c5 Mon Sep 17 00:00:00 2001
+From: Brian Norris <computersforpeace@gmail.com>
+Date: Fri, 26 Feb 2016 11:50:28 +0100
+Subject: [PATCH] mtd: bcm47xxsflash: use ioremap_cache() instead of
+ KSEG0ADDR()
+MIME-Version: 1.0
+Content-Type: text/plain; charset=UTF-8
+Content-Transfer-Encoding: 8bit
+
+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>
+---
+
+--- a/drivers/bcma/driver_chipcommon_sflash.c
++++ b/drivers/bcma/driver_chipcommon_sflash.c
+@@ -146,7 +146,6 @@ int bcma_sflash_init(struct bcma_drv_cc
+ return -ENOTSUPP;
+ }
+
+- sflash->window = BCMA_SOC_FLASH2;
+ sflash->blocksize = e->blocksize;
+ sflash->numblocks = e->numblocks;
+ sflash->size = sflash->blocksize * sflash->numblocks;
+--- 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
+ 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(
+
+ 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(stru
+ 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(stru
+ 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(str
+ struct bcm47xxsflash *b47s = sflash->priv;
+
+ mtd_device_unregister(&b47s->mtd);
++ iounmap(b47s->window);
+
+ return 0;
+ }
+--- 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;
+--- a/include/linux/bcma/bcma_driver_chipcommon.h
++++ b/include/linux/bcma/bcma_driver_chipcommon.h
+@@ -585,7 +585,6 @@ struct bcma_pflash {
+ #ifdef CONFIG_BCMA_SFLASH
+ struct bcma_sflash {
+ bool present;
+- u32 window;
+ u32 blocksize;
+ u16 numblocks;
+ u32 size;