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3fef9ed0 RM |
1 | // SPDX-License-Identifier: GPL-2.0-only |
2 | /* | |
3 | * Copyright (C) 2021 Rafał Miłecki <rafal@milecki.pl> | |
4 | */ | |
5 | ||
a5be5ce0 | 6 | #include <linux/bcm47xx_nvram.h> |
73bcd133 RM |
7 | #include <linux/etherdevice.h> |
8 | #include <linux/if_ether.h> | |
3fef9ed0 RM |
9 | #include <linux/io.h> |
10 | #include <linux/mod_devicetable.h> | |
11 | #include <linux/module.h> | |
6e977eaa | 12 | #include <linux/nvmem-consumer.h> |
3fef9ed0 | 13 | #include <linux/nvmem-provider.h> |
207775f7 | 14 | #include <linux/of.h> |
3fef9ed0 | 15 | #include <linux/platform_device.h> |
6e977eaa RM |
16 | #include <linux/slab.h> |
17 | ||
18 | #define NVRAM_MAGIC "FLSH" | |
3fef9ed0 RM |
19 | |
20 | struct brcm_nvram { | |
21 | struct device *dev; | |
22 | void __iomem *base; | |
6e977eaa RM |
23 | struct nvmem_cell_info *cells; |
24 | int ncells; | |
25 | }; | |
26 | ||
27 | struct brcm_nvram_header { | |
28 | char magic[4]; | |
29 | __le32 len; | |
30 | __le32 crc_ver_init; /* 0:7 crc, 8:15 ver, 16:31 sdram_init */ | |
31 | __le32 config_refresh; /* 0:15 sdram_config, 16:31 sdram_refresh */ | |
32 | __le32 config_ncdl; /* ncdl values for memc */ | |
3fef9ed0 RM |
33 | }; |
34 | ||
35 | static int brcm_nvram_read(void *context, unsigned int offset, void *val, | |
36 | size_t bytes) | |
37 | { | |
38 | struct brcm_nvram *priv = context; | |
39 | u8 *dst = val; | |
40 | ||
41 | while (bytes--) | |
42 | *dst++ = readb(priv->base + offset++); | |
43 | ||
44 | return 0; | |
45 | } | |
46 | ||
73bcd133 RM |
47 | static int brcm_nvram_read_post_process_macaddr(void *context, const char *id, int index, |
48 | unsigned int offset, void *buf, size_t bytes) | |
49 | { | |
50 | u8 mac[ETH_ALEN]; | |
51 | ||
52 | if (bytes != 3 * ETH_ALEN - 1) | |
53 | return -EINVAL; | |
54 | ||
55 | if (!mac_pton(buf, mac)) | |
56 | return -EINVAL; | |
57 | ||
58 | if (index) | |
59 | eth_addr_add(mac, index); | |
60 | ||
61 | ether_addr_copy(buf, mac); | |
62 | ||
63 | return 0; | |
64 | } | |
65 | ||
6e977eaa RM |
66 | static int brcm_nvram_add_cells(struct brcm_nvram *priv, uint8_t *data, |
67 | size_t len) | |
68 | { | |
69 | struct device *dev = priv->dev; | |
70 | char *var, *value, *eq; | |
71 | int idx; | |
72 | ||
73 | priv->ncells = 0; | |
74 | for (var = data + sizeof(struct brcm_nvram_header); | |
75 | var < (char *)data + len && *var; | |
76 | var += strlen(var) + 1) { | |
77 | priv->ncells++; | |
78 | } | |
79 | ||
80 | priv->cells = devm_kcalloc(dev, priv->ncells, sizeof(*priv->cells), GFP_KERNEL); | |
81 | if (!priv->cells) | |
82 | return -ENOMEM; | |
83 | ||
84 | for (var = data + sizeof(struct brcm_nvram_header), idx = 0; | |
85 | var < (char *)data + len && *var; | |
86 | var = value + strlen(value) + 1, idx++) { | |
87 | eq = strchr(var, '='); | |
88 | if (!eq) | |
89 | break; | |
90 | *eq = '\0'; | |
91 | value = eq + 1; | |
92 | ||
93 | priv->cells[idx].name = devm_kstrdup(dev, var, GFP_KERNEL); | |
94 | if (!priv->cells[idx].name) | |
95 | return -ENOMEM; | |
96 | priv->cells[idx].offset = value - (char *)data; | |
97 | priv->cells[idx].bytes = strlen(value); | |
207775f7 | 98 | priv->cells[idx].np = of_get_child_by_name(dev->of_node, priv->cells[idx].name); |
73bcd133 RM |
99 | if (!strcmp(var, "et0macaddr") || |
100 | !strcmp(var, "et1macaddr") || | |
101 | !strcmp(var, "et2macaddr")) { | |
102 | priv->cells[idx].raw_len = strlen(value); | |
103 | priv->cells[idx].bytes = ETH_ALEN; | |
104 | priv->cells[idx].read_post_process = brcm_nvram_read_post_process_macaddr; | |
105 | } | |
6e977eaa RM |
106 | } |
107 | ||
108 | return 0; | |
109 | } | |
110 | ||
111 | static int brcm_nvram_parse(struct brcm_nvram *priv) | |
112 | { | |
113 | struct device *dev = priv->dev; | |
114 | struct brcm_nvram_header header; | |
115 | uint8_t *data; | |
116 | size_t len; | |
117 | int err; | |
118 | ||
119 | memcpy_fromio(&header, priv->base, sizeof(header)); | |
120 | ||
121 | if (memcmp(header.magic, NVRAM_MAGIC, 4)) { | |
122 | dev_err(dev, "Invalid NVRAM magic\n"); | |
123 | return -EINVAL; | |
124 | } | |
125 | ||
126 | len = le32_to_cpu(header.len); | |
127 | ||
d3524bb5 | 128 | data = kzalloc(len, GFP_KERNEL); |
b0576ade JJ |
129 | if (!data) |
130 | return -ENOMEM; | |
131 | ||
6e977eaa RM |
132 | memcpy_fromio(data, priv->base, len); |
133 | data[len - 1] = '\0'; | |
134 | ||
135 | err = brcm_nvram_add_cells(priv, data, len); | |
136 | if (err) { | |
137 | dev_err(dev, "Failed to add cells: %d\n", err); | |
138 | return err; | |
139 | } | |
140 | ||
141 | kfree(data); | |
142 | ||
143 | return 0; | |
144 | } | |
145 | ||
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146 | static int brcm_nvram_probe(struct platform_device *pdev) |
147 | { | |
148 | struct nvmem_config config = { | |
149 | .name = "brcm-nvram", | |
150 | .reg_read = brcm_nvram_read, | |
151 | }; | |
152 | struct device *dev = &pdev->dev; | |
153 | struct resource *res; | |
154 | struct brcm_nvram *priv; | |
6e977eaa | 155 | int err; |
3fef9ed0 RM |
156 | |
157 | priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL); | |
158 | if (!priv) | |
159 | return -ENOMEM; | |
160 | priv->dev = dev; | |
161 | ||
cfadd0e7 | 162 | priv->base = devm_platform_get_and_ioremap_resource(pdev, 0, &res); |
3fef9ed0 RM |
163 | if (IS_ERR(priv->base)) |
164 | return PTR_ERR(priv->base); | |
165 | ||
6e977eaa RM |
166 | err = brcm_nvram_parse(priv); |
167 | if (err) | |
168 | return err; | |
169 | ||
a5be5ce0 RM |
170 | bcm47xx_nvram_init_from_iomem(priv->base, resource_size(res)); |
171 | ||
3fef9ed0 | 172 | config.dev = dev; |
6e977eaa RM |
173 | config.cells = priv->cells; |
174 | config.ncells = priv->ncells; | |
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175 | config.priv = priv; |
176 | config.size = resource_size(res); | |
177 | ||
178 | return PTR_ERR_OR_ZERO(devm_nvmem_register(dev, &config)); | |
179 | } | |
180 | ||
181 | static const struct of_device_id brcm_nvram_of_match_table[] = { | |
182 | { .compatible = "brcm,nvram", }, | |
183 | {}, | |
184 | }; | |
185 | ||
186 | static struct platform_driver brcm_nvram_driver = { | |
187 | .probe = brcm_nvram_probe, | |
188 | .driver = { | |
189 | .name = "brcm_nvram", | |
190 | .of_match_table = brcm_nvram_of_match_table, | |
191 | }, | |
192 | }; | |
193 | ||
194 | static int __init brcm_nvram_init(void) | |
195 | { | |
196 | return platform_driver_register(&brcm_nvram_driver); | |
197 | } | |
198 | ||
199 | subsys_initcall_sync(brcm_nvram_init); | |
200 | ||
201 | MODULE_AUTHOR("Rafał Miłecki"); | |
202 | MODULE_LICENSE("GPL"); | |
203 | MODULE_DEVICE_TABLE(of, brcm_nvram_of_match_table); |