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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 of_platform_populate(pdev->dev.of_node, NULL, NULL, &pdev->dev);
}
static int stm32_timers_remove(struct platform_device *pdev)
{
of_platform_depopulate(&pdev->dev);
return 0;
}
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,
.remove = stm32_timers_remove,
.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");
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