Eric Lee / smarc-fsl-linux-kernel

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drivers/mfd/stm32-timers.c 1.98 KB
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81f7e3824   Eric Lee   Initial Release, ... 
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  /*
   * Copyright (C) STMicroelectronics 2016
   *
   * Author: Benjamin Gaignard <benjamin.gaignard@st.com>
   *
   * License terms:  GNU General Public License (GPL), version 2
   */
  
  #include <linux/mfd/stm32-timers.h>
  #include <linux/module.h>
  #include <linux/of_platform.h>
  #include <linux/reset.h>
  
  static const struct regmap_config stm32_timers_regmap_cfg = {
  	.reg_bits = 32,
  	.val_bits = 32,
  	.reg_stride = sizeof(u32),
  	.max_register = 0x3fc,
  };
  
  static void stm32_timers_get_arr_size(struct stm32_timers *ddata)
  {
  	/*
  	 * Only the available bits will be written so when readback
  	 * we get the maximum value of auto reload register
  	 */
  	regmap_write(ddata->regmap, TIM_ARR, ~0L);
  	regmap_read(ddata->regmap, TIM_ARR, &ddata->max_arr);
  	regmap_write(ddata->regmap, TIM_ARR, 0x0);
  }
  
  static int stm32_timers_probe(struct platform_device *pdev)
  {
  	struct device *dev = &pdev->dev;
  	struct stm32_timers *ddata;
  	struct resource *res;
  	void __iomem *mmio;
  
  	ddata = devm_kzalloc(dev, sizeof(*ddata), GFP_KERNEL);
  	if (!ddata)
  		return -ENOMEM;
  
  	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
  	mmio = devm_ioremap_resource(dev, res);
  	if (IS_ERR(mmio))
  		return PTR_ERR(mmio);
  
  	ddata->regmap = devm_regmap_init_mmio_clk(dev, "int", mmio,
  						  &stm32_timers_regmap_cfg);
  	if (IS_ERR(ddata->regmap))
  		return PTR_ERR(ddata->regmap);
  
  	ddata->clk = devm_clk_get(dev, NULL);
  	if (IS_ERR(ddata->clk))
  		return PTR_ERR(ddata->clk);
  
  	stm32_timers_get_arr_size(ddata);
  
  	platform_set_drvdata(pdev, ddata);
  
  	return devm_of_platform_populate(&pdev->dev);
  }
  
  static const struct of_device_id stm32_timers_of_match[] = {
  	{ .compatible = "st,stm32-timers", },
  	{ /* end node */ },
  };
  MODULE_DEVICE_TABLE(of, stm32_timers_of_match);
  
  static struct platform_driver stm32_timers_driver = {
  	.probe = stm32_timers_probe,
  	.driver	= {
  		.name = "stm32-timers",
  		.of_match_table = stm32_timers_of_match,
  	},
  };
  module_platform_driver(stm32_timers_driver);
  
  MODULE_DESCRIPTION("STMicroelectronics STM32 Timers");
  MODULE_LICENSE("GPL v2");