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1// SPDX-License-Identifier: GPL-2.0-only2/*3 * Copyright (C) 2014 Free Electrons4 * Copyright (C) 2014 Atmel5 *6 * Author: Boris BREZILLON <boris.brezillon@free-electrons.com>7 */8 9#include <linux/clk.h>10#include <linux/iopoll.h>11#include <linux/mfd/atmel-hlcdc.h>12#include <linux/mfd/core.h>13#include <linux/module.h>14#include <linux/mod_devicetable.h>15#include <linux/platform_device.h>16#include <linux/regmap.h>17 18#define ATMEL_HLCDC_REG_MAX (0x4000 - 0x4)19 20struct atmel_hlcdc_regmap {21 void __iomem *regs;22 struct device *dev;23};24 25static const struct mfd_cell atmel_hlcdc_cells[] = {26 {27 .name = "atmel-hlcdc-pwm",28 .of_compatible = "atmel,hlcdc-pwm",29 },30 {31 .name = "atmel-hlcdc-dc",32 .of_compatible = "atmel,hlcdc-display-controller",33 },34};35 36static int regmap_atmel_hlcdc_reg_write(void *context, unsigned int reg,37 unsigned int val)38{39 struct atmel_hlcdc_regmap *hregmap = context;40 41 if (reg <= ATMEL_HLCDC_DIS) {42 u32 status;43 int ret;44 45 ret = readl_poll_timeout_atomic(hregmap->regs + ATMEL_HLCDC_SR,46 status,47 !(status & ATMEL_HLCDC_SIP),48 1, 100);49 if (ret) {50 dev_err(hregmap->dev,51 "Timeout! Clock domain synchronization is in progress!\n");52 return ret;53 }54 }55 56 writel(val, hregmap->regs + reg);57 58 return 0;59}60 61static int regmap_atmel_hlcdc_reg_read(void *context, unsigned int reg,62 unsigned int *val)63{64 struct atmel_hlcdc_regmap *hregmap = context;65 66 *val = readl(hregmap->regs + reg);67 68 return 0;69}70 71static const struct regmap_config atmel_hlcdc_regmap_config = {72 .reg_bits = 32,73 .val_bits = 32,74 .reg_stride = 4,75 .max_register = ATMEL_HLCDC_REG_MAX,76 .reg_write = regmap_atmel_hlcdc_reg_write,77 .reg_read = regmap_atmel_hlcdc_reg_read,78 .fast_io = true,79};80 81static int atmel_hlcdc_probe(struct platform_device *pdev)82{83 struct atmel_hlcdc_regmap *hregmap;84 struct device *dev = &pdev->dev;85 struct atmel_hlcdc *hlcdc;86 87 hregmap = devm_kzalloc(dev, sizeof(*hregmap), GFP_KERNEL);88 if (!hregmap)89 return -ENOMEM;90 91 hlcdc = devm_kzalloc(dev, sizeof(*hlcdc), GFP_KERNEL);92 if (!hlcdc)93 return -ENOMEM;94 95 hregmap->regs = devm_platform_ioremap_resource(pdev, 0);96 if (IS_ERR(hregmap->regs))97 return PTR_ERR(hregmap->regs);98 99 hregmap->dev = &pdev->dev;100 101 hlcdc->irq = platform_get_irq(pdev, 0);102 if (hlcdc->irq < 0)103 return hlcdc->irq;104 105 hlcdc->periph_clk = devm_clk_get(dev, "periph_clk");106 if (IS_ERR(hlcdc->periph_clk)) {107 dev_err(dev, "failed to get peripheral clock\n");108 return PTR_ERR(hlcdc->periph_clk);109 }110 111 hlcdc->sys_clk = devm_clk_get(dev, "sys_clk");112 if (IS_ERR(hlcdc->sys_clk)) {113 dev_err(dev, "failed to get system clock\n");114 return PTR_ERR(hlcdc->sys_clk);115 }116 117 hlcdc->slow_clk = devm_clk_get(dev, "slow_clk");118 if (IS_ERR(hlcdc->slow_clk)) {119 dev_err(dev, "failed to get slow clock\n");120 return PTR_ERR(hlcdc->slow_clk);121 }122 123 hlcdc->regmap = devm_regmap_init(dev, NULL, hregmap,124 &atmel_hlcdc_regmap_config);125 if (IS_ERR(hlcdc->regmap))126 return PTR_ERR(hlcdc->regmap);127 128 dev_set_drvdata(dev, hlcdc);129 130 return devm_mfd_add_devices(dev, -1, atmel_hlcdc_cells,131 ARRAY_SIZE(atmel_hlcdc_cells),132 NULL, 0, NULL);133}134 135static const struct of_device_id atmel_hlcdc_match[] = {136 { .compatible = "atmel,at91sam9n12-hlcdc" },137 { .compatible = "atmel,at91sam9x5-hlcdc" },138 { .compatible = "atmel,sama5d2-hlcdc" },139 { .compatible = "atmel,sama5d3-hlcdc" },140 { .compatible = "atmel,sama5d4-hlcdc" },141 { .compatible = "microchip,sam9x60-hlcdc" },142 { .compatible = "microchip,sam9x75-xlcdc" },143 { /* sentinel */ },144};145MODULE_DEVICE_TABLE(of, atmel_hlcdc_match);146 147static struct platform_driver atmel_hlcdc_driver = {148 .probe = atmel_hlcdc_probe,149 .driver = {150 .name = "atmel-hlcdc",151 .of_match_table = atmel_hlcdc_match,152 },153};154module_platform_driver(atmel_hlcdc_driver);155 156MODULE_ALIAS("platform:atmel-hlcdc");157MODULE_AUTHOR("Boris Brezillon <boris.brezillon@free-electrons.com>");158MODULE_DESCRIPTION("Atmel HLCDC driver");159MODULE_LICENSE("GPL v2");160