projects / mirror_ubuntu-artful-kernel.git / blame
| Commit | Line | Data |
|---|---|---|
| c066c1c0 MG |
1 | /* |
| 2 | * i.MX IIM driver | |
| 3 | * | |
| 4 | * Copyright (c) 2017 Pengutronix, Michael Grzeschik <m.grzeschik@pengutronix.de> | |
| 5 | * | |
| 6 | * Based on the barebox iim 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/slab.h> | |
| 26 | #include <linux/clk.h> | |
| 27 | ||
| 28 | #define IIM_BANK_BASE(n) (0x800 + 0x400 * (n)) | |
| 29 | ||
| 30 | struct imx_iim_drvdata { | |
| 31 | unsigned int nregs; | |
| 32 | }; | |
| 33 | ||
| 34 | struct iim_priv { | |
| 35 | void __iomem *base; | |
| 36 | struct clk *clk; | |
| 37 | struct nvmem_config nvmem; | |
| 38 | }; | |
| 39 | ||
| 40 | static int imx_iim_read(void *context, unsigned int offset, | |
| 41 | void *buf, size_t bytes) | |
| 42 | { | |
| 43 | struct iim_priv *iim = context; | |
| 44 | int i, ret; | |
| 45 | u8 *buf8 = buf; | |
| 46 | ||
| 47 | ret = clk_prepare_enable(iim->clk); | |
| 48 | if (ret) | |
| 49 | return ret; | |
| 50 | ||
| 51 | for (i = offset; i < offset + bytes; i++) { | |
| 52 | int bank = i >> 5; | |
| 53 | int reg = i & 0x1f; | |
| 54 | ||
| 55 | *buf8++ = readl(iim->base + IIM_BANK_BASE(bank) + reg * 4); | |
| 56 | } | |
| 57 | ||
| 58 | clk_disable_unprepare(iim->clk); | |
| 59 | ||
| 60 | return 0; | |
| 61 | } | |
| 62 | ||
| 63 | static struct imx_iim_drvdata imx27_drvdata = { | |
| 64 | .nregs = 2 * 32, | |
| 65 | }; | |
| 66 | ||
| 67 | static struct imx_iim_drvdata imx25_imx31_imx35_drvdata = { | |
| 68 | .nregs = 3 * 32, | |
| 69 | }; | |
| 70 | ||
| 71 | static struct imx_iim_drvdata imx51_drvdata = { | |
| 72 | .nregs = 4 * 32, | |
| 73 | }; | |
| 74 | ||
| 75 | static struct imx_iim_drvdata imx53_drvdata = { | |
| 76 | .nregs = 4 * 32 + 16, | |
| 77 | }; | |
| 78 | ||
| 79 | static const struct of_device_id imx_iim_dt_ids[] = { | |
| 80 | { | |
| 81 | .compatible = "fsl,imx25-iim", | |
| 82 | .data = &imx25_imx31_imx35_drvdata, | |
| 83 | }, { | |
| 84 | .compatible = "fsl,imx27-iim", | |
| 85 | .data = &imx27_drvdata, | |
| 86 | }, { | |
| 87 | .compatible = "fsl,imx31-iim", | |
| 88 | .data = &imx25_imx31_imx35_drvdata, | |
| 89 | }, { | |
| 90 | .compatible = "fsl,imx35-iim", | |
| 91 | .data = &imx25_imx31_imx35_drvdata, | |
| 92 | }, { | |
| 93 | .compatible = "fsl,imx51-iim", | |
| 94 | .data = &imx51_drvdata, | |
| 95 | }, { | |
| 96 | .compatible = "fsl,imx53-iim", | |
| 97 | .data = &imx53_drvdata, | |
| 98 | }, { | |
| 99 | /* sentinel */ | |
| 100 | }, | |
| 101 | }; | |
| 102 | MODULE_DEVICE_TABLE(of, imx_iim_dt_ids); | |
| 103 | ||
| 104 | static int imx_iim_probe(struct platform_device *pdev) | |
| 105 | { | |
| 106 | const struct of_device_id *of_id; | |
| 107 | struct device *dev = &pdev->dev; | |
| 108 | struct resource *res; | |
| 109 | struct iim_priv *iim; | |
| 110 | struct nvmem_device *nvmem; | |
| 111 | struct nvmem_config *cfg; | |
| 112 | const struct imx_iim_drvdata *drvdata = NULL; | |
| 113 | ||
| 114 | iim = devm_kzalloc(dev, sizeof(*iim), GFP_KERNEL); | |
| 115 | if (!iim) | |
| 116 | return -ENOMEM; | |
| 117 | ||
| 118 | res = platform_get_resource(pdev, IORESOURCE_MEM, 0); | |
| 119 | iim->base = devm_ioremap_resource(dev, res); | |
| 120 | if (IS_ERR(iim->base)) | |
| 121 | return PTR_ERR(iim->base); | |
| 122 | ||
| 123 | of_id = of_match_device(imx_iim_dt_ids, dev); | |
| 124 | if (!of_id) | |
| 125 | return -ENODEV; | |
| 126 | ||
| 127 | drvdata = of_id->data; | |
| 128 | ||
| 129 | iim->clk = devm_clk_get(&pdev->dev, NULL); | |
| 130 | if (IS_ERR(iim->clk)) | |
| 131 | return PTR_ERR(iim->clk); | |
| 132 | ||
| 133 | cfg = &iim->nvmem; | |
| 134 | ||
| 135 | cfg->name = "imx-iim", | |
| 136 | cfg->read_only = true, | |
| 137 | cfg->word_size = 1, | |
| 138 | cfg->stride = 1, | |
| 139 | cfg->owner = THIS_MODULE, | |
| 140 | cfg->reg_read = imx_iim_read, | |
| 141 | cfg->dev = dev; | |
| 142 | cfg->size = drvdata->nregs; | |
| 143 | cfg->priv = iim; | |
| 144 | ||
| 145 | nvmem = nvmem_register(cfg); | |
| 146 | if (IS_ERR(nvmem)) | |
| 147 | return PTR_ERR(nvmem); | |
| 148 | ||
| 149 | platform_set_drvdata(pdev, nvmem); | |
| 150 | ||
| 151 | return 0; | |
| 152 | } | |
| 153 | ||
| 154 | static int imx_iim_remove(struct platform_device *pdev) | |
| 155 | { | |
| 156 | struct nvmem_device *nvmem = platform_get_drvdata(pdev); | |
| 157 | ||
| 158 | return nvmem_unregister(nvmem); | |
| 159 | } | |
| 160 | ||
| 161 | static struct platform_driver imx_iim_driver = { | |
| 162 | .probe = imx_iim_probe, | |
| 163 | .remove = imx_iim_remove, | |
| 164 | .driver = { | |
| 165 | .name = "imx-iim", | |
| 166 | .of_match_table = imx_iim_dt_ids, | |
| 167 | }, | |
| 168 | }; | |
| 169 | module_platform_driver(imx_iim_driver); | |
| 170 | ||
| 171 | MODULE_AUTHOR("Michael Grzeschik <m.grzeschik@pengutronix.de>"); | |
| 172 | MODULE_DESCRIPTION("i.MX IIM driver"); | |
| 173 | MODULE_LICENSE("GPL v2"); |