projects / linux.git / blame
| Commit | Line | Data |
|---|---|---|
| 4640fa18 NM |
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 | ||
| 19 | static int zynqmp_nvmem_read(void *context, unsigned int offset, | |
| 20 | void *val, size_t bytes) | |
| 21 | { | |
| 22 | int ret; | |
| 23 | int idcode, version; | |
| 24 | struct zynqmp_nvmem_data *priv = context; | |
| 25 | ||
| 26 | const struct zynqmp_eemi_ops *eemi_ops = zynqmp_pm_get_eemi_ops(); | |
| 27 | ||
| 28 | if (!eemi_ops || !eemi_ops->get_chipid) | |
| 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 | ||
| 64 | priv->dev = dev; | |
| 65 | econfig.dev = dev; | |
| 66 | econfig.reg_read = zynqmp_nvmem_read; | |
| 67 | econfig.priv = priv; | |
| 68 | ||
| 69 | priv->nvmem = devm_nvmem_register(dev, &econfig); | |
| 70 | ||
| 71 | return PTR_ERR_OR_ZERO(priv->nvmem); | |
| 72 | } | |
| 73 | ||
| 74 | static struct platform_driver zynqmp_nvmem_driver = { | |
| 75 | .probe = zynqmp_nvmem_probe, | |
| 76 | .driver = { | |
| 77 | .name = "zynqmp-nvmem", | |
| 78 | .of_match_table = zynqmp_nvmem_match, | |
| 79 | }, | |
| 80 | }; | |
| 81 | ||
| 82 | module_platform_driver(zynqmp_nvmem_driver); | |
| 83 | ||
| 84 | MODULE_AUTHOR("Michal Simek <[email protected]>, Nava kishore Manne <[email protected]>"); | |
| 85 | MODULE_DESCRIPTION("ZynqMP NVMEM driver"); | |
| 86 | MODULE_LICENSE("GPL"); |