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1 | // SPDX-License-Identifier: GPL-2.0+ |
2 | /* | |
3 | * Copyright (C) 2019 Xilinx, Inc. | |
4 | */ | |
5 | ||
6 | #include <linux/module.h> | |
7 | #include <linux/nvmem-provider.h> | |
8 | #include <linux/of.h> | |
9 | #include <linux/platform_device.h> | |
10 | #include <linux/firmware/xlnx-zynqmp.h> | |
11 | ||
12 | #define SILICON_REVISION_MASK 0xF | |
13 | ||
14 | struct zynqmp_nvmem_data { | |
15 | struct device *dev; | |
16 | struct nvmem_device *nvmem; | |
17 | }; | |
18 | ||
3d031378 RV |
19 | static const struct zynqmp_eemi_ops *eemi_ops; |
20 | ||
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21 | static int zynqmp_nvmem_read(void *context, unsigned int offset, |
22 | void *val, size_t bytes) | |
23 | { | |
24 | int ret; | |
25 | int idcode, version; | |
26 | struct zynqmp_nvmem_data *priv = context; | |
27 | ||
3d031378 | 28 | if (!eemi_ops->get_chipid) |
4640fa18 NM |
29 | return -ENXIO; |
30 | ||
31 | ret = eemi_ops->get_chipid(&idcode, &version); | |
32 | if (ret < 0) | |
33 | return ret; | |
34 | ||
35 | dev_dbg(priv->dev, "Read chipid val %x %x\n", idcode, version); | |
36 | *(int *)val = version & SILICON_REVISION_MASK; | |
37 | ||
38 | return 0; | |
39 | } | |
40 | ||
41 | static struct nvmem_config econfig = { | |
42 | .name = "zynqmp-nvmem", | |
43 | .owner = THIS_MODULE, | |
44 | .word_size = 1, | |
45 | .size = 1, | |
46 | .read_only = true, | |
47 | }; | |
48 | ||
49 | static const struct of_device_id zynqmp_nvmem_match[] = { | |
50 | { .compatible = "xlnx,zynqmp-nvmem-fw", }, | |
51 | { /* sentinel */ }, | |
52 | }; | |
53 | MODULE_DEVICE_TABLE(of, zynqmp_nvmem_match); | |
54 | ||
55 | static int zynqmp_nvmem_probe(struct platform_device *pdev) | |
56 | { | |
57 | struct device *dev = &pdev->dev; | |
58 | struct zynqmp_nvmem_data *priv; | |
59 | ||
60 | priv = devm_kzalloc(dev, sizeof(struct zynqmp_nvmem_data), GFP_KERNEL); | |
61 | if (!priv) | |
62 | return -ENOMEM; | |
63 | ||
3d031378 RV |
64 | eemi_ops = zynqmp_pm_get_eemi_ops(); |
65 | if (IS_ERR(eemi_ops)) | |
66 | return PTR_ERR(eemi_ops); | |
67 | ||
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68 | priv->dev = dev; |
69 | econfig.dev = dev; | |
70 | econfig.reg_read = zynqmp_nvmem_read; | |
71 | econfig.priv = priv; | |
72 | ||
73 | priv->nvmem = devm_nvmem_register(dev, &econfig); | |
74 | ||
75 | return PTR_ERR_OR_ZERO(priv->nvmem); | |
76 | } | |
77 | ||
78 | static struct platform_driver zynqmp_nvmem_driver = { | |
79 | .probe = zynqmp_nvmem_probe, | |
80 | .driver = { | |
81 | .name = "zynqmp-nvmem", | |
82 | .of_match_table = zynqmp_nvmem_match, | |
83 | }, | |
84 | }; | |
85 | ||
86 | module_platform_driver(zynqmp_nvmem_driver); | |
87 | ||
88 | MODULE_AUTHOR("Michal Simek <michal.simek@xilinx.com>, Nava kishore Manne <navam@xilinx.com>"); | |
89 | MODULE_DESCRIPTION("ZynqMP NVMEM driver"); | |
90 | MODULE_LICENSE("GPL"); |