target/linux/bcm53xx/patches-5.10/800-0001-firmware-bcm47xx_nvram-support-init-from-IO-memory.patch

   1 From: =?UTF-8?q?Rafa=C5=82=20Mi=C5=82ecki?= <rafal@milecki.pl>
   2 Date: Thu, 11 Mar 2021 08:24:44 +0100
   3 Subject: [PATCH] firmware: bcm47xx_nvram: support init from IO memory
   4 MIME-Version: 1.0
   5 Content-Type: text/plain; charset=UTF-8
   6 Content-Transfer-Encoding: 8bit
   7
   8 Signed-off-by: Rafał Miłecki <rafal@milecki.pl>
   9 ---
  10  drivers/firmware/broadcom/bcm47xx_nvram.c | 17 +++++++++++++++++
  11  include/linux/bcm47xx_nvram.h             |  6 ++++++
  12  2 files changed, 23 insertions(+)
  13
  14 --- a/drivers/firmware/broadcom/bcm47xx_nvram.c
  15 +++ b/drivers/firmware/broadcom/bcm47xx_nvram.c
  16 @@ -110,6 +110,23 @@ found:
  17         return 0;
  18  }
  19
  20 +int bcm47xx_nvram_init_from_iomem(void __iomem *nvram_start, size_t res_size)
  21 +{
  22 +       if (nvram_len) {
  23 +               pr_warn("nvram already initialized\n");
  24 +               return -EEXIST;
  25 +       }
  26 +
  27 +       if (!bcm47xx_nvram_is_valid(nvram_start)) {
  28 +               pr_err("No valid NVRAM found\n");
  29 +               return -ENOENT;
  30 +       }
  31 +
  32 +       bcm47xx_nvram_copy(nvram_start, res_size);
  33 +
  34 +       return 0;
  35 +}
  36 +
  37  /*
  38   * On bcm47xx we need access to the NVRAM very early, so we can't use mtd
  39   * subsystem to access flash. We can't even use platform device / driver to
  40 --- a/include/linux/bcm47xx_nvram.h
  41 +++ b/include/linux/bcm47xx_nvram.h
  42 @@ -11,6 +11,7 @@
  43  #include <linux/vmalloc.h>
  44
  45  #ifdef CONFIG_BCM47XX_NVRAM
  46 +int bcm47xx_nvram_init_from_iomem(void __iomem *nvram_start, size_t res_size);
  47  int bcm47xx_nvram_init_from_mem(u32 base, u32 lim);
  48  int bcm47xx_nvram_getenv(const char *name, char *val, size_t val_len);
  49  int bcm47xx_nvram_gpio_pin(const char *name);
  50 @@ -20,6 +21,11 @@ static inline void bcm47xx_nvram_release
  51         vfree(nvram);
  52  };
  53  #else
  54 +static inline int bcm47xx_nvram_init_from_iomem(void __iomem *nvram_start,
  55 +                                               size_t res_size)
  56 +{
  57 +       return -ENOTSUPP;
  58 +}
  59  static inline int bcm47xx_nvram_init_from_mem(u32 base, u32 lim)
  60  {
  61         return -ENOTSUPP;