1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
|
From b152bbeb0282bfcf6f91d0d5befd7582c1c3fc23 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Rafa=C5=82=20Mi=C5=82ecki?= <rafal@milecki.pl>
Date: Fri, 5 Mar 2021 19:32:36 +0100
Subject: [PATCH] nvmem: brcm_nvram: new driver exposing Broadcom's NVRAM
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit
This driver provides access to Broadcom's NVRAM.
Signed-off-by: Rafał Miłecki <rafal@milecki.pl>
Signed-off-by: Srinivas Kandagatla <srinivas.kandagatla@linaro.org>
---
drivers/nvmem/Kconfig | 9 +++++
drivers/nvmem/Makefile | 2 +
drivers/nvmem/brcm_nvram.c | 78 ++++++++++++++++++++++++++++++++++++++
3 files changed, 89 insertions(+)
create mode 100644 drivers/nvmem/brcm_nvram.c
--- a/drivers/nvmem/Kconfig
+++ b/drivers/nvmem/Kconfig
@@ -283,4 +283,13 @@ config NVMEM_U_BOOT_ENV
If compiled as module it will be called nvmem_u-boot-env.
+
+config NVMEM_BRCM_NVRAM
+ tristate "Broadcom's NVRAM support"
+ depends on ARCH_BCM_5301X || COMPILE_TEST
+ depends on HAS_IOMEM
+ help
+ This driver provides support for Broadcom's NVRAM that can be accessed
+ using I/O mapping.
+
endif
--- a/drivers/nvmem/Makefile
+++ b/drivers/nvmem/Makefile
@@ -57,3 +57,5 @@ obj-$(CONFIG_SPRD_EFUSE) += nvmem_sprd_e
nvmem_sprd_efuse-y := sprd-efuse.o
obj-$(CONFIG_NVMEM_U_BOOT_ENV) += nvmem_u-boot-env.o
nvmem_u-boot-env-y := u-boot-env.o
+obj-$(CONFIG_NVMEM_BRCM_NVRAM) += nvmem_brcm_nvram.o
+nvmem_brcm_nvram-y := brcm_nvram.o
--- /dev/null
+++ b/drivers/nvmem/brcm_nvram.c
@@ -0,0 +1,78 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * Copyright (C) 2021 Rafał Miłecki <rafal@milecki.pl>
+ */
+
+#include <linux/io.h>
+#include <linux/mod_devicetable.h>
+#include <linux/module.h>
+#include <linux/nvmem-provider.h>
+#include <linux/platform_device.h>
+
+struct brcm_nvram {
+ struct device *dev;
+ void __iomem *base;
+};
+
+static int brcm_nvram_read(void *context, unsigned int offset, void *val,
+ size_t bytes)
+{
+ struct brcm_nvram *priv = context;
+ u8 *dst = val;
+
+ while (bytes--)
+ *dst++ = readb(priv->base + offset++);
+
+ return 0;
+}
+
+static int brcm_nvram_probe(struct platform_device *pdev)
+{
+ struct nvmem_config config = {
+ .name = "brcm-nvram",
+ .reg_read = brcm_nvram_read,
+ };
+ struct device *dev = &pdev->dev;
+ struct resource *res;
+ struct brcm_nvram *priv;
+
+ priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);
+ if (!priv)
+ return -ENOMEM;
+ priv->dev = dev;
+
+ res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+ priv->base = devm_ioremap_resource(dev, res);
+ if (IS_ERR(priv->base))
+ return PTR_ERR(priv->base);
+
+ config.dev = dev;
+ config.priv = priv;
+ config.size = resource_size(res);
+
+ return PTR_ERR_OR_ZERO(devm_nvmem_register(dev, &config));
+}
+
+static const struct of_device_id brcm_nvram_of_match_table[] = {
+ { .compatible = "brcm,nvram", },
+ {},
+};
+
+static struct platform_driver brcm_nvram_driver = {
+ .probe = brcm_nvram_probe,
+ .driver = {
+ .name = "brcm_nvram",
+ .of_match_table = brcm_nvram_of_match_table,
+ },
+};
+
+static int __init brcm_nvram_init(void)
+{
+ return platform_driver_register(&brcm_nvram_driver);
+}
+
+subsys_initcall_sync(brcm_nvram_init);
+
+MODULE_AUTHOR("Rafał Miłecki");
+MODULE_LICENSE("GPL");
+MODULE_DEVICE_TABLE(of, brcm_nvram_of_match_table);
|
