LXR linux/drivers/mfd/atmel-hlcdc.c

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