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
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Rafał Miłecki
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1 changed files with 138 additions and 0 deletions
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From 5651d6aaf489d1db48c253cf884b40214e91c2c5 Mon Sep 17 00:00:00 2001
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From: Brian Norris <computersforpeace@gmail.com>
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Date: Fri, 26 Feb 2016 11:50:28 +0100
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Subject: [PATCH] mtd: bcm47xxsflash: use ioremap_cache() instead of
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KSEG0ADDR()
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MIME-Version: 1.0
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Content-Type: text/plain; charset=UTF-8
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Content-Transfer-Encoding: 8bit
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Using KSEG0ADDR makes code highly MIPS dependent and not portable.
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Thanks to the fix a68f376 ("MIPS: io.h: Define `ioremap_cache'") we can
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use ioremap_cache which is generic and supported on MIPS as well now.
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KSEG0ADDR was translating 0x1c000000 into 0x9c000000. With ioremap_cache
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we use MIPS's __ioremap (and then remap_area_pages). This results in
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different address (e.g. 0xc0080000) but it still should be cached as
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expected and it was successfully tested with BCM47186B0.
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Other than that drivers/bcma/driver_chipcommon_sflash.c nicely setups a
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struct resource for access window, but we wren't using it. Use it now
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and drop duplicated info.
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Signed-off-by: Brian Norris <computersforpeace@gmail.com>
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Signed-off-by: Rafał Miłecki <zajec5@gmail.com>
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---
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--- a/drivers/bcma/driver_chipcommon_sflash.c
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+++ b/drivers/bcma/driver_chipcommon_sflash.c
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@@ -146,7 +146,6 @@ int bcma_sflash_init(struct bcma_drv_cc
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return -ENOTSUPP;
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}
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- sflash->window = BCMA_SOC_FLASH2;
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sflash->blocksize = e->blocksize;
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sflash->numblocks = e->numblocks;
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sflash->size = sflash->blocksize * sflash->numblocks;
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--- a/drivers/mtd/devices/bcm47xxsflash.c
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+++ b/drivers/mtd/devices/bcm47xxsflash.c
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@@ -2,6 +2,7 @@
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#include <linux/module.h>
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#include <linux/slab.h>
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#include <linux/delay.h>
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+#include <linux/ioport.h>
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#include <linux/mtd/mtd.h>
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#include <linux/platform_device.h>
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#include <linux/bcma/bcma.h>
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@@ -109,8 +110,7 @@ static int bcm47xxsflash_read(struct mtd
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if ((from + len) > mtd->size)
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return -EINVAL;
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- memcpy_fromio(buf, (void __iomem *)KSEG0ADDR(b47s->window + from),
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- len);
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+ memcpy_fromio(buf, b47s->window + from, len);
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*retlen = len;
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return len;
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@@ -275,15 +275,33 @@ static void bcm47xxsflash_bcma_cc_write(
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static int bcm47xxsflash_bcma_probe(struct platform_device *pdev)
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{
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- struct bcma_sflash *sflash = dev_get_platdata(&pdev->dev);
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+ struct device *dev = &pdev->dev;
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+ struct bcma_sflash *sflash = dev_get_platdata(dev);
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struct bcm47xxsflash *b47s;
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+ struct resource *res;
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int err;
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- b47s = devm_kzalloc(&pdev->dev, sizeof(*b47s), GFP_KERNEL);
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+ b47s = devm_kzalloc(dev, sizeof(*b47s), GFP_KERNEL);
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if (!b47s)
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return -ENOMEM;
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sflash->priv = b47s;
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+ res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
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+ if (!res) {
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+ dev_err(dev, "invalid resource\n");
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+ return -EINVAL;
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+ }
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+ if (!devm_request_mem_region(dev, res->start, resource_size(res),
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+ res->name)) {
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+ dev_err(dev, "can't request region for resource %pR\n", res);
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+ return -EBUSY;
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+ }
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+ b47s->window = ioremap_cache(res->start, resource_size(res));
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+ if (!b47s->window) {
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+ dev_err(dev, "ioremap failed for resource %pR\n", res);
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+ return -ENOMEM;
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+ }
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+
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b47s->bcma_cc = container_of(sflash, struct bcma_drv_cc, sflash);
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b47s->cc_read = bcm47xxsflash_bcma_cc_read;
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b47s->cc_write = bcm47xxsflash_bcma_cc_write;
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@@ -297,7 +315,6 @@ static int bcm47xxsflash_bcma_probe(stru
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break;
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}
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- b47s->window = sflash->window;
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b47s->blocksize = sflash->blocksize;
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b47s->numblocks = sflash->numblocks;
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b47s->size = sflash->size;
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@@ -306,6 +323,7 @@ static int bcm47xxsflash_bcma_probe(stru
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err = mtd_device_parse_register(&b47s->mtd, probes, NULL, NULL, 0);
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if (err) {
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pr_err("Failed to register MTD device: %d\n", err);
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+ iounmap(b47s->window);
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return err;
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}
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@@ -321,6 +339,7 @@ static int bcm47xxsflash_bcma_remove(str
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struct bcm47xxsflash *b47s = sflash->priv;
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mtd_device_unregister(&b47s->mtd);
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+ iounmap(b47s->window);
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return 0;
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}
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--- a/drivers/mtd/devices/bcm47xxsflash.h
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+++ b/drivers/mtd/devices/bcm47xxsflash.h
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@@ -65,7 +65,8 @@ struct bcm47xxsflash {
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enum bcm47xxsflash_type type;
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- u32 window;
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+ void __iomem *window;
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+
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u32 blocksize;
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u16 numblocks;
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u32 size;
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--- a/include/linux/bcma/bcma_driver_chipcommon.h
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+++ b/include/linux/bcma/bcma_driver_chipcommon.h
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@@ -585,7 +585,6 @@ struct bcma_pflash {
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#ifdef CONFIG_BCMA_SFLASH
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struct bcma_sflash {
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bool present;
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- u32 window;
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u32 blocksize;
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u16 numblocks;
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u32 size;
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