101 lines
3.2 KiB
Diff
101 lines
3.2 KiB
Diff
From a5be5ce0e25439fae3cd42e3d775979547926812 Mon Sep 17 00:00:00 2001
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From: =?UTF-8?q?Rafa=C5=82=20Mi=C5=82ecki?= <rafal@milecki.pl>
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Date: Thu, 3 Nov 2022 09:25:29 +0100
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Subject: [PATCH] firmware/nvram: bcm47xx: support init from IO memory
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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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Provide NVMEM content to the NVRAM driver from a simple
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memory resource. This is necessary to use NVRAM in a memory-
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mapped flash device. Patch taken from OpenWrts development
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tree.
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This patch makes it possible to use memory-mapped NVRAM
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on the D-Link DWL-8610AP and the D-Link DIR-890L.
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Cc: Hauke Mehrtens <hauke@hauke-m.de>
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Cc: linux-mips@vger.kernel.org
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Cc: Florian Fainelli <f.fainelli@gmail.com>
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Cc: bcm-kernel-feedback-list@broadcom.com
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Cc: Thomas Bogendoerfer <tsbogend@alpha.franken.de>
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Signed-off-by: Rafał Miłecki <rafal@milecki.pl>
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[Added an export for modules potentially using the init symbol]
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Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
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Link: https://lore.kernel.org/r/20221103082529.359084-1-linus.walleij@linaro.org
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Signed-off-by: Florian Fainelli <f.fainelli@gmail.com>
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---
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drivers/firmware/broadcom/bcm47xx_nvram.c | 18 ++++++++++++++++++
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drivers/nvmem/brcm_nvram.c | 3 +++
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include/linux/bcm47xx_nvram.h | 6 ++++++
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3 files changed, 27 insertions(+)
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--- a/drivers/firmware/broadcom/bcm47xx_nvram.c
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+++ b/drivers/firmware/broadcom/bcm47xx_nvram.c
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@@ -110,6 +110,24 @@ found:
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return 0;
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}
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+int bcm47xx_nvram_init_from_iomem(void __iomem *nvram_start, size_t res_size)
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+{
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+ if (nvram_len) {
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+ pr_warn("nvram already initialized\n");
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+ return -EEXIST;
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+ }
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+
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+ if (!bcm47xx_nvram_is_valid(nvram_start)) {
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+ pr_err("No valid NVRAM found\n");
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+ return -ENOENT;
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+ }
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+
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+ bcm47xx_nvram_copy(nvram_start, res_size);
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+
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+ return 0;
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+}
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+EXPORT_SYMBOL_GPL(bcm47xx_nvram_init_from_iomem);
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+
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/*
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* On bcm47xx we need access to the NVRAM very early, so we can't use mtd
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* subsystem to access flash. We can't even use platform device / driver to
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--- a/drivers/nvmem/brcm_nvram.c
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+++ b/drivers/nvmem/brcm_nvram.c
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@@ -3,6 +3,7 @@
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* Copyright (C) 2021 Rafał Miłecki <rafal@milecki.pl>
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*/
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+#include <linux/bcm47xx_nvram.h>
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#include <linux/io.h>
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#include <linux/mod_devicetable.h>
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#include <linux/module.h>
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@@ -139,6 +140,8 @@ static int brcm_nvram_probe(struct platf
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if (err)
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return err;
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+ bcm47xx_nvram_init_from_iomem(priv->base, resource_size(res));
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+
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config.dev = dev;
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config.cells = priv->cells;
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config.ncells = priv->ncells;
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--- a/include/linux/bcm47xx_nvram.h
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+++ b/include/linux/bcm47xx_nvram.h
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@@ -11,6 +11,7 @@
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#include <linux/vmalloc.h>
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#ifdef CONFIG_BCM47XX_NVRAM
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+int bcm47xx_nvram_init_from_iomem(void __iomem *nvram_start, size_t res_size);
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int bcm47xx_nvram_init_from_mem(u32 base, u32 lim);
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int bcm47xx_nvram_getenv(const char *name, char *val, size_t val_len);
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int bcm47xx_nvram_gpio_pin(const char *name);
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@@ -20,6 +21,11 @@ static inline void bcm47xx_nvram_release
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vfree(nvram);
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};
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#else
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+static inline int bcm47xx_nvram_init_from_iomem(void __iomem *nvram_start,
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+ size_t res_size)
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+{
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+ return -ENOTSUPP;
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+}
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static inline int bcm47xx_nvram_init_from_mem(u32 base, u32 lim)
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{
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return -ENOTSUPP;
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