projects / linux-2.6-block.git / blame
| Commit | Line | Data |
|---|---|---|
| fb127b79 SA |
1 | /* |
| 2 | * Copyright 2015 Toradex AG | |
| 3 | * | |
| 4 | * Stefan Agner <stefan@agner.ch> | |
| 5 | * | |
| 6 | * Freescale TCON device driver | |
| 7 | * | |
| 8 | * This program is free software; you can redistribute it and/or modify | |
| 9 | * it under the terms of the GNU General Public License as published by | |
| 10 | * the Free Software Foundation; either version 2 of the License, or | |
| 11 | * (at your option) any later version. | |
| 12 | */ | |
| 13 | ||
| 14 | #include <linux/clk.h> | |
| 15 | #include <linux/io.h> | |
| 16 | #include <linux/mm.h> | |
| 17 | #include <linux/of_address.h> | |
| 18 | #include <linux/platform_device.h> | |
| 19 | #include <linux/regmap.h> | |
| 20 | ||
| 21 | #include "fsl_tcon.h" | |
| 22 | ||
| 23 | void fsl_tcon_bypass_disable(struct fsl_tcon *tcon) | |
| 24 | { | |
| 25 | regmap_update_bits(tcon->regs, FSL_TCON_CTRL1, | |
| 26 | FSL_TCON_CTRL1_TCON_BYPASS, 0); | |
| 27 | } | |
| 28 | ||
| 29 | void fsl_tcon_bypass_enable(struct fsl_tcon *tcon) | |
| 30 | { | |
| 31 | regmap_update_bits(tcon->regs, FSL_TCON_CTRL1, | |
| 32 | FSL_TCON_CTRL1_TCON_BYPASS, | |
| 33 | FSL_TCON_CTRL1_TCON_BYPASS); | |
| 34 | } | |
| 35 | ||
| 36 | static struct regmap_config fsl_tcon_regmap_config = { | |
| 37 | .reg_bits = 32, | |
| 38 | .reg_stride = 4, | |
| 39 | .val_bits = 32, | |
| 40 | ||
| 41 | .name = "tcon", | |
| 42 | }; | |
| 43 | ||
| 44 | static int fsl_tcon_init_regmap(struct device *dev, | |
| 45 | struct fsl_tcon *tcon, | |
| 46 | struct device_node *np) | |
| 47 | { | |
| 48 | struct resource res; | |
| 49 | void __iomem *regs; | |
| 50 | ||
| 51 | if (of_address_to_resource(np, 0, &res)) | |
| 52 | return -EINVAL; | |
| 53 | ||
| 54 | regs = devm_ioremap_resource(dev, &res); | |
| 55 | if (IS_ERR(regs)) | |
| 56 | return PTR_ERR(regs); | |
| 57 | ||
| 58 | tcon->regs = devm_regmap_init_mmio(dev, regs, | |
| 59 | &fsl_tcon_regmap_config); | |
| 60 | if (IS_ERR(tcon->regs)) | |
| 61 | return PTR_ERR(tcon->regs); | |
| 62 | ||
| 63 | return 0; | |
| 64 | } | |
| 65 | ||
| 66 | struct fsl_tcon *fsl_tcon_init(struct device *dev) | |
| 67 | { | |
| 68 | struct fsl_tcon *tcon; | |
| 69 | struct device_node *np; | |
| 70 | int ret; | |
| 71 | ||
| 72 | /* TCON node is not mandatory, some devices do not provide TCON */ | |
| 73 | np = of_parse_phandle(dev->of_node, "fsl,tcon", 0); | |
| 74 | if (!np) | |
| 75 | return NULL; | |
| 76 | ||
| 77 | tcon = devm_kzalloc(dev, sizeof(*tcon), GFP_KERNEL); | |
| 78 | if (!tcon) { | |
| 79 | ret = -ENOMEM; | |
| 80 | goto err_node_put; | |
| 81 | } | |
| 82 | ||
| 83 | ret = fsl_tcon_init_regmap(dev, tcon, np); | |
| 84 | if (ret) { | |
| 85 | dev_err(dev, "Couldn't create the TCON regmap\n"); | |
| 86 | goto err_node_put; | |
| 87 | } | |
| 88 | ||
| 89 | tcon->ipg_clk = of_clk_get_by_name(np, "ipg"); | |
| 90 | if (IS_ERR(tcon->ipg_clk)) { | |
| 91 | dev_err(dev, "Couldn't get the TCON bus clock\n"); | |
| 92 | goto err_node_put; | |
| 93 | } | |
| 94 | ||
| 64bf74ee | 95 | of_node_put(np); |
| fb127b79 SA |
96 | clk_prepare_enable(tcon->ipg_clk); |
| 97 | ||
| 98 | dev_info(dev, "Using TCON in bypass mode\n"); | |
| 99 | ||
| 100 | return tcon; | |
| 101 | ||
| 102 | err_node_put: | |
| 103 | of_node_put(np); | |
| 104 | return NULL; | |
| 105 | } | |
| 106 | ||
| 107 | void fsl_tcon_free(struct fsl_tcon *tcon) | |
| 108 | { | |
| 109 | clk_disable_unprepare(tcon->ipg_clk); | |
| 110 | clk_put(tcon->ipg_clk); | |
| 111 | } | |
| 112 |