projects / mirror_ubuntu-focal-kernel.git / blame
| Commit | Line | Data |
|---|---|---|
| 67ff708b PF |
1 | // SPDX-License-Identifier: GPL-2.0+ |
| 2 | /* | |
| 3 | * i.MX8 OCOTP fusebox driver | |
| 4 | * | |
| 5 | * Copyright 2019 NXP | |
| 6 | * | |
| 7 | * Peng Fan <peng.fan@nxp.com> | |
| 8 | */ | |
| 9 | ||
| 10 | #include <linux/firmware/imx/sci.h> | |
| 11 | #include <linux/module.h> | |
| 12 | #include <linux/nvmem-provider.h> | |
| 13 | #include <linux/of_device.h> | |
| 14 | #include <linux/platform_device.h> | |
| 15 | #include <linux/slab.h> | |
| 16 | ||
| 17 | enum ocotp_devtype { | |
| 18 | IMX8QXP, | |
| 19 | }; | |
| 20 | ||
| 21 | struct ocotp_devtype_data { | |
| 22 | int devtype; | |
| 23 | int nregs; | |
| 24 | }; | |
| 25 | ||
| 26 | struct ocotp_priv { | |
| 27 | struct device *dev; | |
| 28 | const struct ocotp_devtype_data *data; | |
| 29 | struct imx_sc_ipc *nvmem_ipc; | |
| 30 | }; | |
| 31 | ||
| 32 | struct imx_sc_msg_misc_fuse_read { | |
| 33 | struct imx_sc_rpc_msg hdr; | |
| 34 | u32 word; | |
| 35 | } __packed; | |
| 36 | ||
| 37 | static struct ocotp_devtype_data imx8qxp_data = { | |
| 38 | .devtype = IMX8QXP, | |
| 39 | .nregs = 800, | |
| 40 | }; | |
| 41 | ||
| 42 | static int imx_sc_misc_otp_fuse_read(struct imx_sc_ipc *ipc, u32 word, | |
| 43 | u32 *val) | |
| 44 | { | |
| 45 | struct imx_sc_msg_misc_fuse_read msg; | |
| 46 | struct imx_sc_rpc_msg *hdr = &msg.hdr; | |
| 47 | int ret; | |
| 48 | ||
| 49 | hdr->ver = IMX_SC_RPC_VERSION; | |
| 50 | hdr->svc = IMX_SC_RPC_SVC_MISC; | |
| 51 | hdr->func = IMX_SC_MISC_FUNC_OTP_FUSE_READ; | |
| 52 | hdr->size = 2; | |
| 53 | ||
| 54 | msg.word = word; | |
| 55 | ||
| 56 | ret = imx_scu_call_rpc(ipc, &msg, true); | |
| 57 | if (ret) | |
| 58 | return ret; | |
| 59 | ||
| 60 | *val = msg.word; | |
| 61 | ||
| 62 | return 0; | |
| 63 | } | |
| 64 | ||
| 65 | static int imx_scu_ocotp_read(void *context, unsigned int offset, | |
| 66 | void *val, size_t bytes) | |
| 67 | { | |
| 68 | struct ocotp_priv *priv = context; | |
| 69 | u32 count, index, num_bytes; | |
| 70 | u32 *buf; | |
| 71 | void *p; | |
| 72 | int i, ret; | |
| 73 | ||
| 74 | index = offset >> 2; | |
| 75 | num_bytes = round_up((offset % 4) + bytes, 4); | |
| 76 | count = num_bytes >> 2; | |
| 77 | ||
| 78 | if (count > (priv->data->nregs - index)) | |
| 79 | count = priv->data->nregs - index; | |
| 80 | ||
| 81 | p = kzalloc(num_bytes, GFP_KERNEL); | |
| 82 | if (!p) | |
| 83 | return -ENOMEM; | |
| 84 | ||
| 85 | buf = p; | |
| 86 | ||
| 87 | for (i = index; i < (index + count); i++) { | |
| 88 | if (priv->data->devtype == IMX8QXP) { | |
| 89 | if ((i > 271) && (i < 544)) { | |
| 90 | *buf++ = 0; | |
| 91 | continue; | |
| 92 | } | |
| 93 | } | |
| 94 | ||
| 95 | ret = imx_sc_misc_otp_fuse_read(priv->nvmem_ipc, i, buf); | |
| 96 | if (ret) { | |
| 97 | kfree(p); | |
| 98 | return ret; | |
| 99 | } | |
| 100 | buf++; | |
| 101 | } | |
| 102 | ||
| 103 | memcpy(val, (u8 *)p + offset % 4, bytes); | |
| 104 | ||
| 105 | kfree(p); | |
| 106 | ||
| 107 | return 0; | |
| 108 | } | |
| 109 | ||
| 110 | static struct nvmem_config imx_scu_ocotp_nvmem_config = { | |
| 111 | .name = "imx-scu-ocotp", | |
| 112 | .read_only = true, | |
| 113 | .word_size = 4, | |
| 114 | .stride = 1, | |
| 115 | .owner = THIS_MODULE, | |
| 116 | .reg_read = imx_scu_ocotp_read, | |
| 117 | }; | |
| 118 | ||
| 119 | static const struct of_device_id imx_scu_ocotp_dt_ids[] = { | |
| 120 | { .compatible = "fsl,imx8qxp-scu-ocotp", (void *)&imx8qxp_data }, | |
| 121 | { }, | |
| 122 | }; | |
| 123 | MODULE_DEVICE_TABLE(of, imx_scu_ocotp_dt_ids); | |
| 124 | ||
| 125 | static int imx_scu_ocotp_probe(struct platform_device *pdev) | |
| 126 | { | |
| 127 | struct device *dev = &pdev->dev; | |
| 128 | struct ocotp_priv *priv; | |
| 129 | struct nvmem_device *nvmem; | |
| 130 | int ret; | |
| 131 | ||
| 132 | priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL); | |
| 133 | if (!priv) | |
| 134 | return -ENOMEM; | |
| 135 | ||
| 136 | ret = imx_scu_get_handle(&priv->nvmem_ipc); | |
| 137 | if (ret) | |
| 138 | return ret; | |
| 139 | ||
| 140 | priv->data = of_device_get_match_data(dev); | |
| 141 | priv->dev = dev; | |
| 142 | imx_scu_ocotp_nvmem_config.size = 4 * priv->data->nregs; | |
| 143 | imx_scu_ocotp_nvmem_config.dev = dev; | |
| 144 | imx_scu_ocotp_nvmem_config.priv = priv; | |
| 145 | nvmem = devm_nvmem_register(dev, &imx_scu_ocotp_nvmem_config); | |
| 146 | ||
| 147 | return PTR_ERR_OR_ZERO(nvmem); | |
| 148 | } | |
| 149 | ||
| 150 | static struct platform_driver imx_scu_ocotp_driver = { | |
| 151 | .probe = imx_scu_ocotp_probe, | |
| 152 | .driver = { | |
| 153 | .name = "imx_scu_ocotp", | |
| 154 | .of_match_table = imx_scu_ocotp_dt_ids, | |
| 155 | }, | |
| 156 | }; | |
| 157 | module_platform_driver(imx_scu_ocotp_driver); | |
| 158 | ||
| 159 | MODULE_AUTHOR("Peng Fan <peng.fan@nxp.com>"); | |
| 160 | MODULE_DESCRIPTION("i.MX8 SCU OCOTP fuse box driver"); | |
| 161 | MODULE_LICENSE("GPL v2"); |