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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 | /* * Copyright (C) 2014 Free Electrons * Copyright (C) 2014 Atmel * * Author: Boris BREZILLON <boris.brezillon@free-electrons.com> * * This program is free software; you can redistribute it and/or modify it * under the terms of the GNU General Public License version 2 as published by * the Free Software Foundation. * * This program is distributed in the hope that it will be useful, but WITHOUT * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for * more details. * * You should have received a copy of the GNU General Public License along with * this program. If not, see <http://www.gnu.org/licenses/>. */ #include <linux/clk.h> #include <linux/iopoll.h> #include <linux/mfd/atmel-hlcdc.h> #include <linux/mfd/core.h> #include <linux/module.h> #include <linux/platform_device.h> #include <linux/regmap.h> #define ATMEL_HLCDC_REG_MAX (0x4000 - 0x4) struct atmel_hlcdc_regmap { void __iomem *regs; }; static const struct mfd_cell atmel_hlcdc_cells[] = { { .name = "atmel-hlcdc-pwm", .of_compatible = "atmel,hlcdc-pwm", }, { .name = "atmel-hlcdc-dc", .of_compatible = "atmel,hlcdc-display-controller", }, }; static int regmap_atmel_hlcdc_reg_write(void *context, unsigned int reg, unsigned int val) { struct atmel_hlcdc_regmap *hregmap = context; if (reg <= ATMEL_HLCDC_DIS) { u32 status; readl_poll_timeout_atomic(hregmap->regs + ATMEL_HLCDC_SR, status, !(status & ATMEL_HLCDC_SIP), 1, 100); } writel(val, hregmap->regs + reg); return 0; } static int regmap_atmel_hlcdc_reg_read(void *context, unsigned int reg, unsigned int *val) { struct atmel_hlcdc_regmap *hregmap = context; *val = readl(hregmap->regs + reg); return 0; } static const struct regmap_config atmel_hlcdc_regmap_config = { .reg_bits = 32, .val_bits = 32, .reg_stride = 4, .max_register = ATMEL_HLCDC_REG_MAX, .reg_write = regmap_atmel_hlcdc_reg_write, .reg_read = regmap_atmel_hlcdc_reg_read, .fast_io = true, }; static int atmel_hlcdc_probe(struct platform_device *pdev) { struct atmel_hlcdc_regmap *hregmap; struct device *dev = &pdev->dev; struct atmel_hlcdc *hlcdc; struct resource *res; hregmap = devm_kzalloc(dev, sizeof(*hregmap), GFP_KERNEL); if (!hregmap) return -ENOMEM; hlcdc = devm_kzalloc(dev, sizeof(*hlcdc), GFP_KERNEL); if (!hlcdc) return -ENOMEM; res = platform_get_resource(pdev, IORESOURCE_MEM, 0); hregmap->regs = devm_ioremap_resource(dev, res); if (IS_ERR(hregmap->regs)) return PTR_ERR(hregmap->regs); hlcdc->irq = platform_get_irq(pdev, 0); if (hlcdc->irq < 0) return hlcdc->irq; hlcdc->periph_clk = devm_clk_get(dev, "periph_clk"); if (IS_ERR(hlcdc->periph_clk)) { dev_err(dev, "failed to get peripheral clock\n"); return PTR_ERR(hlcdc->periph_clk); } hlcdc->sys_clk = devm_clk_get(dev, "sys_clk"); if (IS_ERR(hlcdc->sys_clk)) { dev_err(dev, "failed to get system clock\n"); return PTR_ERR(hlcdc->sys_clk); } hlcdc->slow_clk = devm_clk_get(dev, "slow_clk"); if (IS_ERR(hlcdc->slow_clk)) { dev_err(dev, "failed to get slow clock\n"); return PTR_ERR(hlcdc->slow_clk); } hlcdc->regmap = devm_regmap_init(dev, NULL, hregmap, &atmel_hlcdc_regmap_config); if (IS_ERR(hlcdc->regmap)) return PTR_ERR(hlcdc->regmap); dev_set_drvdata(dev, hlcdc); return devm_mfd_add_devices(dev, -1, atmel_hlcdc_cells, ARRAY_SIZE(atmel_hlcdc_cells), NULL, 0, NULL); } static const struct of_device_id atmel_hlcdc_match[] = { { .compatible = "atmel,at91sam9n12-hlcdc" }, { .compatible = "atmel,at91sam9x5-hlcdc" }, { .compatible = "atmel,sama5d2-hlcdc" }, { .compatible = "atmel,sama5d3-hlcdc" }, { .compatible = "atmel,sama5d4-hlcdc" }, { /* sentinel */ }, }; MODULE_DEVICE_TABLE(of, atmel_hlcdc_match); static struct platform_driver atmel_hlcdc_driver = { .probe = atmel_hlcdc_probe, .driver = { .name = "atmel-hlcdc", .of_match_table = atmel_hlcdc_match, }, }; module_platform_driver(atmel_hlcdc_driver); MODULE_ALIAS("platform:atmel-hlcdc"); MODULE_AUTHOR("Boris Brezillon <boris.brezillon@free-electrons.com>"); MODULE_DESCRIPTION("Atmel HLCDC driver"); MODULE_LICENSE("GPL v2"); |