target/linux/generic/patches-4.4/042-mtd-bcm47xxsflash-use-ioremap_cache-instead-of-KSEG0.patch

   1 From 5651d6aaf489d1db48c253cf884b40214e91c2c5 Mon Sep 17 00:00:00 2001
   2 From: Brian Norris <computersforpeace@gmail.com>
   3 Date: Fri, 26 Feb 2016 11:50:28 +0100
   4 Subject: [PATCH] mtd: bcm47xxsflash: use ioremap_cache() instead of
   5  KSEG0ADDR()
   6 MIME-Version: 1.0
   7 Content-Type: text/plain; charset=UTF-8
   8 Content-Transfer-Encoding: 8bit
   9
  10 Using KSEG0ADDR makes code highly MIPS dependent and not portable.
  11 Thanks to the fix a68f376 ("MIPS: io.h: Define `ioremap_cache'") we can
  12 use ioremap_cache which is generic and supported on MIPS as well now.
  13
  14 KSEG0ADDR was translating 0x1c000000 into 0x9c000000. With ioremap_cache
  15 we use MIPS's __ioremap (and then remap_area_pages). This results in
  16 different address (e.g. 0xc0080000) but it still should be cached as
  17 expected and it was successfully tested with BCM47186B0.
  18
  19 Other than that drivers/bcma/driver_chipcommon_sflash.c nicely setups a
  20 struct resource for access window, but we wren't using it. Use it now
  21 and drop duplicated info.
  22
  23 Signed-off-by: Brian Norris <computersforpeace@gmail.com>
  24 Signed-off-by: Rafał Miłecki <zajec5@gmail.com>
  25 ---
  26
  27 --- a/drivers/bcma/driver_chipcommon_sflash.c
  28 +++ b/drivers/bcma/driver_chipcommon_sflash.c
  29 @@ -146,7 +146,6 @@ int bcma_sflash_init(struct bcma_drv_cc
  30                 return -ENOTSUPP;
  31         }
  32
  33 -       sflash->window = BCMA_SOC_FLASH2;
  34         sflash->blocksize = e->blocksize;
  35         sflash->numblocks = e->numblocks;
  36         sflash->size = sflash->blocksize * sflash->numblocks;
  37 --- a/drivers/mtd/devices/bcm47xxsflash.c
  38 +++ b/drivers/mtd/devices/bcm47xxsflash.c
  39 @@ -2,6 +2,7 @@
  40  #include <linux/module.h>
  41  #include <linux/slab.h>
  42  #include <linux/delay.h>
  43 +#include <linux/ioport.h>
  44  #include <linux/mtd/mtd.h>
  45  #include <linux/platform_device.h>
  46  #include <linux/bcma/bcma.h>
  47 @@ -109,8 +110,7 @@ static int bcm47xxsflash_read(struct mtd
  48         if ((from + len) > mtd->size)
  49                 return -EINVAL;
  50
  51 -       memcpy_fromio(buf, (void __iomem *)KSEG0ADDR(b47s->window + from),
  52 -                     len);
  53 +       memcpy_fromio(buf, b47s->window + from, len);
  54         *retlen = len;
  55
  56         return len;
  57 @@ -275,15 +275,33 @@ static void bcm47xxsflash_bcma_cc_write(
  58
  59  static int bcm47xxsflash_bcma_probe(struct platform_device *pdev)
  60  {
  61 -       struct bcma_sflash *sflash = dev_get_platdata(&pdev->dev);
  62 +       struct device *dev = &pdev->dev;
  63 +       struct bcma_sflash *sflash = dev_get_platdata(dev);
  64         struct bcm47xxsflash *b47s;
  65 +       struct resource *res;
  66         int err;
  67
  68 -       b47s = devm_kzalloc(&pdev->dev, sizeof(*b47s), GFP_KERNEL);
  69 +       b47s = devm_kzalloc(dev, sizeof(*b47s), GFP_KERNEL);
  70         if (!b47s)
  71                 return -ENOMEM;
  72         sflash->priv = b47s;
  73
  74 +       res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
  75 +       if (!res) {
  76 +               dev_err(dev, "invalid resource\n");
  77 +               return -EINVAL;
  78 +       }
  79 +       if (!devm_request_mem_region(dev, res->start, resource_size(res),
  80 +                                    res->name)) {
  81 +               dev_err(dev, "can't request region for resource %pR\n", res);
  82 +               return -EBUSY;
  83 +       }
  84 +       b47s->window = ioremap_cache(res->start, resource_size(res));
  85 +       if (!b47s->window) {
  86 +               dev_err(dev, "ioremap failed for resource %pR\n", res);
  87 +               return -ENOMEM;
  88 +       }
  89 +
  90         b47s->bcma_cc = container_of(sflash, struct bcma_drv_cc, sflash);
  91         b47s->cc_read = bcm47xxsflash_bcma_cc_read;
  92         b47s->cc_write = bcm47xxsflash_bcma_cc_write;
  93 @@ -297,7 +315,6 @@ static int bcm47xxsflash_bcma_probe(stru
  94                 break;
  95         }
  96
  97 -       b47s->window = sflash->window;
  98         b47s->blocksize = sflash->blocksize;
  99         b47s->numblocks = sflash->numblocks;
 100         b47s->size = sflash->size;
 101 @@ -306,6 +323,7 @@ static int bcm47xxsflash_bcma_probe(stru
 102         err = mtd_device_parse_register(&b47s->mtd, probes, NULL, NULL, 0);
 103         if (err) {
 104                 pr_err("Failed to register MTD device: %d\n", err);
 105 +               iounmap(b47s->window);
 106                 return err;
 107         }
 108
 109 @@ -321,6 +339,7 @@ static int bcm47xxsflash_bcma_remove(str
 110         struct bcm47xxsflash *b47s = sflash->priv;
 111
 112         mtd_device_unregister(&b47s->mtd);
 113 +       iounmap(b47s->window);
 114
 115         return 0;
 116  }
 117 --- a/drivers/mtd/devices/bcm47xxsflash.h
 118 +++ b/drivers/mtd/devices/bcm47xxsflash.h
 119 @@ -65,7 +65,8 @@ struct bcm47xxsflash {
 120
 121         enum bcm47xxsflash_type type;
 122
 123 -       u32 window;
 124 +       void __iomem *window;
 125 +
 126         u32 blocksize;
 127         u16 numblocks;
 128         u32 size;
 129 --- a/include/linux/bcma/bcma_driver_chipcommon.h
 130 +++ b/include/linux/bcma/bcma_driver_chipcommon.h
 131 @@ -585,7 +585,6 @@ struct bcma_pflash {
 132  #ifdef CONFIG_BCMA_SFLASH
 133  struct bcma_sflash {
 134         bool present;
 135 -       u32 window;
 136         u32 blocksize;
 137         u16 numblocks;
 138         u32 size;