1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3 * Copyright (c) 2023, Qualcomm Innovation Center, Inc. All rights reserved.
4 */
5
6 #include <linux/firmware/qcom/qcom_scm.h>
7 #include <linux/mod_devicetable.h>
8 #include <linux/nvmem-provider.h>
9 #include <linux/platform_device.h>
10 #include <linux/pm_runtime.h>
11
12 /**
13 * struct sec_qfprom - structure holding secure qfprom attributes
14 *
15 * @base: starting physical address for secure qfprom corrected address space.
16 * @dev: qfprom device structure.
17 */
18 struct sec_qfprom {
19 phys_addr_t base;
20 struct device *dev;
21 };
22
sec_qfprom_reg_read(void * context,unsigned int reg,void * _val,size_t bytes)23 static int sec_qfprom_reg_read(void *context, unsigned int reg, void *_val, size_t bytes)
24 {
25 struct sec_qfprom *priv = context;
26 unsigned int i;
27 u8 *val = _val;
28 u32 read_val;
29 u8 *tmp;
30
31 for (i = 0; i < bytes; i++, reg++) {
32 if (i == 0 || reg % 4 == 0) {
33 if (qcom_scm_io_readl(priv->base + (reg & ~3), &read_val)) {
34 dev_err(priv->dev, "Couldn't access fuse register\n");
35 return -EINVAL;
36 }
37 tmp = (u8 *)&read_val;
38 }
39
40 val[i] = tmp[reg & 3];
41 }
42
43 return 0;
44 }
45
sec_qfprom_probe(struct platform_device * pdev)46 static int sec_qfprom_probe(struct platform_device *pdev)
47 {
48 struct nvmem_config econfig = {
49 .name = "sec-qfprom",
50 .stride = 1,
51 .word_size = 1,
52 .id = NVMEM_DEVID_AUTO,
53 .reg_read = sec_qfprom_reg_read,
54 };
55 struct device *dev = &pdev->dev;
56 struct nvmem_device *nvmem;
57 struct sec_qfprom *priv;
58 struct resource *res;
59
60 priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);
61 if (!priv)
62 return -ENOMEM;
63
64 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
65 if (!res)
66 return -EINVAL;
67
68 priv->base = res->start;
69
70 econfig.size = resource_size(res);
71 econfig.dev = dev;
72 econfig.priv = priv;
73
74 priv->dev = dev;
75
76 nvmem = devm_nvmem_register(dev, &econfig);
77
78 return PTR_ERR_OR_ZERO(nvmem);
79 }
80
81 static const struct of_device_id sec_qfprom_of_match[] = {
82 { .compatible = "qcom,sec-qfprom" },
83 {/* sentinel */},
84 };
85 MODULE_DEVICE_TABLE(of, sec_qfprom_of_match);
86
87 static struct platform_driver qfprom_driver = {
88 .probe = sec_qfprom_probe,
89 .driver = {
90 .name = "qcom_sec_qfprom",
91 .of_match_table = sec_qfprom_of_match,
92 },
93 };
94 module_platform_driver(qfprom_driver);
95 MODULE_DESCRIPTION("Qualcomm Secure QFPROM driver");
96 MODULE_LICENSE("GPL");
97
