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22e9e6fc PF |
1 | // SPDX-License-Identifier: GPL-2.0-only |
2 | /* | |
3 | * i.MX9 OCOTP fusebox driver | |
4 | * | |
5 | * Copyright 2023 NXP | |
6 | */ | |
7 | ||
8 | #include <linux/device.h> | |
9 | #include <linux/io.h> | |
10 | #include <linux/module.h> | |
11 | #include <linux/nvmem-provider.h> | |
9bf75da0 | 12 | #include <linux/of.h> |
22e9e6fc PF |
13 | #include <linux/platform_device.h> |
14 | #include <linux/slab.h> | |
15 | ||
16 | enum fuse_type { | |
17 | FUSE_FSB = 1, | |
18 | FUSE_ELE = 2, | |
19 | FUSE_INVALID = -1 | |
20 | }; | |
21 | ||
22 | struct ocotp_map_entry { | |
23 | u32 start; /* start word */ | |
24 | u32 num; /* num words */ | |
25 | enum fuse_type type; | |
26 | }; | |
27 | ||
28 | struct ocotp_devtype_data { | |
29 | u32 reg_off; | |
30 | char *name; | |
31 | u32 size; | |
32 | u32 num_entry; | |
33 | u32 flag; | |
34 | nvmem_reg_read_t reg_read; | |
35 | struct ocotp_map_entry entry[]; | |
36 | }; | |
37 | ||
38 | struct imx_ocotp_priv { | |
39 | struct device *dev; | |
40 | void __iomem *base; | |
41 | struct nvmem_config config; | |
42 | struct mutex lock; | |
43 | const struct ocotp_devtype_data *data; | |
44 | }; | |
45 | ||
46 | static enum fuse_type imx_ocotp_fuse_type(void *context, u32 index) | |
47 | { | |
48 | struct imx_ocotp_priv *priv = context; | |
49 | const struct ocotp_devtype_data *data = priv->data; | |
50 | u32 start, end; | |
51 | int i; | |
52 | ||
53 | for (i = 0; i < data->num_entry; i++) { | |
54 | start = data->entry[i].start; | |
55 | end = data->entry[i].start + data->entry[i].num; | |
56 | ||
57 | if (index >= start && index < end) | |
58 | return data->entry[i].type; | |
59 | } | |
60 | ||
61 | return FUSE_INVALID; | |
62 | } | |
63 | ||
64 | static int imx_ocotp_reg_read(void *context, unsigned int offset, void *val, size_t bytes) | |
65 | { | |
66 | struct imx_ocotp_priv *priv = context; | |
67 | void __iomem *reg = priv->base + priv->data->reg_off; | |
68 | u32 count, index, num_bytes; | |
69 | enum fuse_type type; | |
70 | u32 *buf; | |
71 | void *p; | |
72 | int i; | |
73 | ||
74 | index = offset; | |
75 | num_bytes = round_up(bytes, 4); | |
76 | count = num_bytes >> 2; | |
77 | ||
78 | if (count > ((priv->data->size >> 2) - index)) | |
79 | count = (priv->data->size >> 2) - index; | |
80 | ||
81 | p = kzalloc(num_bytes, GFP_KERNEL); | |
82 | if (!p) | |
83 | return -ENOMEM; | |
84 | ||
85 | mutex_lock(&priv->lock); | |
86 | ||
87 | buf = p; | |
88 | ||
89 | for (i = index; i < (index + count); i++) { | |
90 | type = imx_ocotp_fuse_type(context, i); | |
91 | if (type == FUSE_INVALID || type == FUSE_ELE) { | |
92 | *buf++ = 0; | |
93 | continue; | |
94 | } | |
95 | ||
96 | *buf++ = readl_relaxed(reg + (i << 2)); | |
97 | } | |
98 | ||
99 | memcpy(val, (u8 *)p, bytes); | |
100 | ||
101 | mutex_unlock(&priv->lock); | |
102 | ||
103 | kfree(p); | |
104 | ||
105 | return 0; | |
106 | }; | |
107 | ||
108 | static int imx_ele_ocotp_probe(struct platform_device *pdev) | |
109 | { | |
110 | struct device *dev = &pdev->dev; | |
111 | struct imx_ocotp_priv *priv; | |
112 | struct nvmem_device *nvmem; | |
113 | ||
114 | priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL); | |
115 | if (!priv) | |
116 | return -ENOMEM; | |
117 | ||
118 | priv->data = of_device_get_match_data(dev); | |
119 | ||
120 | priv->base = devm_platform_ioremap_resource(pdev, 0); | |
121 | if (IS_ERR(priv->base)) | |
122 | return PTR_ERR(priv->base); | |
123 | ||
124 | priv->config.dev = dev; | |
125 | priv->config.name = "ELE-OCOTP"; | |
126 | priv->config.id = NVMEM_DEVID_AUTO; | |
127 | priv->config.owner = THIS_MODULE; | |
128 | priv->config.size = priv->data->size; | |
129 | priv->config.reg_read = priv->data->reg_read; | |
130 | priv->config.word_size = 4; | |
131 | priv->config.stride = 1; | |
132 | priv->config.priv = priv; | |
133 | priv->config.read_only = true; | |
134 | mutex_init(&priv->lock); | |
135 | ||
136 | nvmem = devm_nvmem_register(dev, &priv->config); | |
137 | if (IS_ERR(nvmem)) | |
138 | return PTR_ERR(nvmem); | |
139 | ||
140 | return 0; | |
141 | } | |
142 | ||
143 | static const struct ocotp_devtype_data imx93_ocotp_data = { | |
144 | .reg_off = 0x8000, | |
145 | .reg_read = imx_ocotp_reg_read, | |
146 | .size = 2048, | |
147 | .num_entry = 6, | |
148 | .entry = { | |
149 | { 0, 52, FUSE_FSB }, | |
150 | { 63, 1, FUSE_ELE}, | |
151 | { 128, 16, FUSE_ELE }, | |
152 | { 182, 1, FUSE_ELE }, | |
153 | { 188, 1, FUSE_ELE }, | |
154 | { 312, 200, FUSE_FSB } | |
155 | }, | |
156 | }; | |
157 | ||
158 | static const struct of_device_id imx_ele_ocotp_dt_ids[] = { | |
159 | { .compatible = "fsl,imx93-ocotp", .data = &imx93_ocotp_data, }, | |
160 | {}, | |
161 | }; | |
162 | MODULE_DEVICE_TABLE(of, imx_ele_ocotp_dt_ids); | |
163 | ||
164 | static struct platform_driver imx_ele_ocotp_driver = { | |
165 | .driver = { | |
166 | .name = "imx_ele_ocotp", | |
167 | .of_match_table = imx_ele_ocotp_dt_ids, | |
168 | }, | |
169 | .probe = imx_ele_ocotp_probe, | |
170 | }; | |
171 | module_platform_driver(imx_ele_ocotp_driver); | |
172 | ||
173 | MODULE_DESCRIPTION("i.MX OCOTP/ELE driver"); | |
174 | MODULE_AUTHOR("Peng Fan <peng.fan@nxp.com>"); | |
175 | MODULE_LICENSE("GPL"); |