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3ce0d62b39
It supports NVRAM access described using DT binding. Right now NVRAM
data is exposed using /sys/bus/nvmem/ only.
Signed-off-by: Rafał Miłecki <rafal@milecki.pl>
(cherry picked from commit 01b1b37528)
125 lines
3.2 KiB
Diff
125 lines
3.2 KiB
Diff
From b152bbeb0282bfcf6f91d0d5befd7582c1c3fc23 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: Fri, 5 Mar 2021 19:32:36 +0100
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Subject: [PATCH] nvmem: brcm_nvram: new driver exposing Broadcom's NVRAM
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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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This driver provides access to Broadcom's NVRAM.
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Signed-off-by: Rafał Miłecki <rafal@milecki.pl>
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Signed-off-by: Srinivas Kandagatla <srinivas.kandagatla@linaro.org>
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---
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drivers/nvmem/Kconfig | 9 +++++
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drivers/nvmem/Makefile | 2 +
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drivers/nvmem/brcm_nvram.c | 78 ++++++++++++++++++++++++++++++++++++++
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3 files changed, 89 insertions(+)
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create mode 100644 drivers/nvmem/brcm_nvram.c
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--- a/drivers/nvmem/Kconfig
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+++ b/drivers/nvmem/Kconfig
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@@ -230,4 +230,13 @@ config NVMEM_ZYNQMP
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If sure, say yes. If unsure, say no.
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+
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+config NVMEM_BRCM_NVRAM
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+ tristate "Broadcom's NVRAM support"
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+ depends on ARCH_BCM_5301X || COMPILE_TEST
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+ depends on HAS_IOMEM
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+ help
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+ This driver provides support for Broadcom's NVRAM that can be accessed
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+ using I/O mapping.
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+
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endif
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--- a/drivers/nvmem/Makefile
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+++ b/drivers/nvmem/Makefile
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@@ -50,3 +50,5 @@ obj-$(CONFIG_SC27XX_EFUSE) += nvmem-sc27
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nvmem-sc27xx-efuse-y := sc27xx-efuse.o
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obj-$(CONFIG_NVMEM_ZYNQMP) += nvmem_zynqmp_nvmem.o
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nvmem_zynqmp_nvmem-y := zynqmp_nvmem.o
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+obj-$(CONFIG_NVMEM_BRCM_NVRAM) += nvmem_brcm_nvram.o
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+nvmem_brcm_nvram-y := brcm_nvram.o
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--- /dev/null
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+++ b/drivers/nvmem/brcm_nvram.c
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@@ -0,0 +1,78 @@
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+// SPDX-License-Identifier: GPL-2.0-only
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+/*
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+ * Copyright (C) 2021 Rafał Miłecki <rafal@milecki.pl>
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+ */
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+
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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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+#include <linux/nvmem-provider.h>
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+#include <linux/platform_device.h>
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+
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+struct brcm_nvram {
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+ struct device *dev;
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+ void __iomem *base;
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+};
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+
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+static int brcm_nvram_read(void *context, unsigned int offset, void *val,
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+ size_t bytes)
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+{
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+ struct brcm_nvram *priv = context;
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+ u8 *dst = val;
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+
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+ while (bytes--)
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+ *dst++ = readb(priv->base + offset++);
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+
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+ return 0;
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+}
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+
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+static int brcm_nvram_probe(struct platform_device *pdev)
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+{
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+ struct nvmem_config config = {
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+ .name = "brcm-nvram",
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+ .reg_read = brcm_nvram_read,
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+ };
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+ struct device *dev = &pdev->dev;
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+ struct resource *res;
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+ struct brcm_nvram *priv;
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+
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+ priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);
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+ if (!priv)
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+ return -ENOMEM;
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+ priv->dev = dev;
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+
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+ res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
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+ priv->base = devm_ioremap_resource(dev, res);
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+ if (IS_ERR(priv->base))
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+ return PTR_ERR(priv->base);
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+
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+ config.dev = dev;
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+ config.priv = priv;
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+ config.size = resource_size(res);
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+
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+ return PTR_ERR_OR_ZERO(devm_nvmem_register(dev, &config));
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+}
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+
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+static const struct of_device_id brcm_nvram_of_match_table[] = {
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+ { .compatible = "brcm,nvram", },
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+ {},
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+};
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+
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+static struct platform_driver brcm_nvram_driver = {
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+ .probe = brcm_nvram_probe,
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+ .driver = {
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+ .name = "brcm_nvram",
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+ .of_match_table = brcm_nvram_of_match_table,
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+ },
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+};
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+
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+static int __init brcm_nvram_init(void)
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+{
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+ return platform_driver_register(&brcm_nvram_driver);
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+}
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+
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+subsys_initcall_sync(brcm_nvram_init);
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+
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+MODULE_AUTHOR("Rafał Miłecki");
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+MODULE_LICENSE("GPL");
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+MODULE_DEVICE_TABLE(of, brcm_nvram_of_match_table);
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