projects / linux-2.6-block.git / blame
| Commit | Line | Data |
|---|---|---|
| 3edba6b4 PZ |
1 | /* |
| 2 | * i.MX6 OCOTP fusebox driver | |
| 3 | * | |
| 4 | * Copyright (c) 2015 Pengutronix, Philipp Zabel <p.zabel@pengutronix.de> | |
| 5 | * | |
| 6 | * Based on the barebox ocotp driver, | |
| 7 | * Copyright (c) 2010 Baruch Siach <baruch@tkos.co.il>, | |
| 8 | * Orex Computed Radiography | |
| 9 | * | |
| 10 | * This program is free software; you can redistribute it and/or modify | |
| 11 | * it under the terms of the GNU General Public License version 2 | |
| 12 | * as published by the Free Software Foundation. | |
| 13 | * | |
| 14 | * http://www.opensource.org/licenses/gpl-license.html | |
| 15 | * http://www.gnu.org/copyleft/gpl.html | |
| 16 | */ | |
| 17 | ||
| 18 | #include <linux/device.h> | |
| 19 | #include <linux/io.h> | |
| 20 | #include <linux/module.h> | |
| 21 | #include <linux/nvmem-provider.h> | |
| 22 | #include <linux/of.h> | |
| 23 | #include <linux/of_device.h> | |
| 24 | #include <linux/platform_device.h> | |
| 25 | #include <linux/regmap.h> | |
| 26 | #include <linux/slab.h> | |
| 27 | ||
| 28 | struct ocotp_priv { | |
| 29 | struct device *dev; | |
| 30 | void __iomem *base; | |
| 31 | unsigned int nregs; | |
| 32 | }; | |
| 33 | ||
| 34 | static int imx_ocotp_read(void *context, const void *reg, size_t reg_size, | |
| 35 | void *val, size_t val_size) | |
| 36 | { | |
| 37 | struct ocotp_priv *priv = context; | |
| 38 | unsigned int offset = *(u32 *)reg; | |
| 39 | unsigned int count; | |
| 40 | int i; | |
| 41 | u32 index; | |
| 42 | ||
| 43 | index = offset >> 2; | |
| 44 | count = val_size >> 2; | |
| 45 | ||
| 46 | if (count > (priv->nregs - index)) | |
| 47 | count = priv->nregs - index; | |
| 48 | ||
| 49 | for (i = index; i < (index + count); i++) { | |
| 50 | *(u32 *)val = readl(priv->base + 0x400 + i * 0x10); | |
| 51 | val += 4; | |
| 52 | } | |
| 53 | ||
| c7e3c5f8 | 54 | return 0; |
| 3edba6b4 PZ |
55 | } |
| 56 | ||
| 57 | static int imx_ocotp_write(void *context, const void *data, size_t count) | |
| 58 | { | |
| 59 | /* Not implemented */ | |
| 60 | return 0; | |
| 61 | } | |
| 62 | ||
| 63 | static struct regmap_bus imx_ocotp_bus = { | |
| 64 | .read = imx_ocotp_read, | |
| 65 | .write = imx_ocotp_write, | |
| 66 | .reg_format_endian_default = REGMAP_ENDIAN_NATIVE, | |
| 67 | .val_format_endian_default = REGMAP_ENDIAN_NATIVE, | |
| 68 | }; | |
| 69 | ||
| 70 | static bool imx_ocotp_writeable_reg(struct device *dev, unsigned int reg) | |
| 71 | { | |
| 72 | return false; | |
| 73 | } | |
| 74 | ||
| 75 | static struct regmap_config imx_ocotp_regmap_config = { | |
| 76 | .reg_bits = 32, | |
| 77 | .val_bits = 32, | |
| 78 | .reg_stride = 4, | |
| 79 | .writeable_reg = imx_ocotp_writeable_reg, | |
| 80 | .name = "imx-ocotp", | |
| 81 | }; | |
| 82 | ||
| 83 | static struct nvmem_config imx_ocotp_nvmem_config = { | |
| 84 | .name = "imx-ocotp", | |
| 85 | .read_only = true, | |
| 86 | .owner = THIS_MODULE, | |
| 87 | }; | |
| 88 | ||
| 89 | static const struct of_device_id imx_ocotp_dt_ids[] = { | |
| 90 | { .compatible = "fsl,imx6q-ocotp", (void *)128 }, | |
| 91 | { .compatible = "fsl,imx6sl-ocotp", (void *)32 }, | |
| 92 | { .compatible = "fsl,imx6sx-ocotp", (void *)128 }, | |
| 93 | { }, | |
| 94 | }; | |
| 95 | MODULE_DEVICE_TABLE(of, imx_ocotp_dt_ids); | |
| 96 | ||
| 97 | static int imx_ocotp_probe(struct platform_device *pdev) | |
| 98 | { | |
| 99 | const struct of_device_id *of_id; | |
| 100 | struct device *dev = &pdev->dev; | |
| 101 | struct resource *res; | |
| 102 | struct regmap *regmap; | |
| 103 | struct ocotp_priv *priv; | |
| 104 | struct nvmem_device *nvmem; | |
| 105 | ||
| 106 | priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL); | |
| 107 | if (!priv) | |
| 108 | return -ENOMEM; | |
| 109 | ||
| 110 | res = platform_get_resource(pdev, IORESOURCE_MEM, 0); | |
| 111 | priv->base = devm_ioremap_resource(dev, res); | |
| 112 | if (IS_ERR(priv->base)) | |
| 113 | return PTR_ERR(priv->base); | |
| 114 | ||
| 115 | of_id = of_match_device(imx_ocotp_dt_ids, dev); | |
| 116 | priv->nregs = (unsigned int)of_id->data; | |
| 117 | imx_ocotp_regmap_config.max_register = 4 * priv->nregs - 4; | |
| 118 | ||
| 119 | regmap = devm_regmap_init(dev, &imx_ocotp_bus, priv, | |
| 120 | &imx_ocotp_regmap_config); | |
| 121 | if (IS_ERR(regmap)) { | |
| 122 | dev_err(dev, "regmap init failed\n"); | |
| 123 | return PTR_ERR(regmap); | |
| 124 | } | |
| 125 | imx_ocotp_nvmem_config.dev = dev; | |
| 126 | nvmem = nvmem_register(&imx_ocotp_nvmem_config); | |
| 127 | if (IS_ERR(nvmem)) | |
| 128 | return PTR_ERR(nvmem); | |
| 129 | ||
| 130 | platform_set_drvdata(pdev, nvmem); | |
| 131 | ||
| 132 | return 0; | |
| 133 | } | |
| 134 | ||
| 135 | static int imx_ocotp_remove(struct platform_device *pdev) | |
| 136 | { | |
| 137 | struct nvmem_device *nvmem = platform_get_drvdata(pdev); | |
| 138 | ||
| 139 | return nvmem_unregister(nvmem); | |
| 140 | } | |
| 141 | ||
| 142 | static struct platform_driver imx_ocotp_driver = { | |
| 143 | .probe = imx_ocotp_probe, | |
| 144 | .remove = imx_ocotp_remove, | |
| 145 | .driver = { | |
| 146 | .name = "imx_ocotp", | |
| 147 | .of_match_table = imx_ocotp_dt_ids, | |
| 148 | }, | |
| 149 | }; | |
| 150 | module_platform_driver(imx_ocotp_driver); | |
| 151 | ||
| 152 | MODULE_AUTHOR("Philipp Zabel <p.zabel@pengutronix.de>"); | |
| 153 | MODULE_DESCRIPTION("i.MX6 OCOTP fuse box driver"); | |
| 154 | MODULE_LICENSE("GPL v2"); |