d0f949e220
This hardware block could at used at same time for PWM generation and IIO timers. PWM and IIO timer configuration are mixed in the same registers so we need a multi fonction driver to be able to share those registers. version 7: - rebase on v4.10-rc2 version 6: - rename files to stm32-timers - rename functions to stm32_timers_xxx version 5: - fix Lee comments about detect function - add missing dependency on REGMAP_MMIO version 4: - add a function to detect Auto Reload Register (ARR) size - rename the structure shared with other drivers version 2: - rename driver "stm32-gptimer" to be align with SoC documentation - only keep one compatible - use of_platform_populate() instead of devm_mfd_add_devices() Signed-off-by: Benjamin Gaignard <benjamin.gaignard@st.com> Acked-by: Rob Herring <robh@kernel.org> Signed-off-by: Lee Jones <lee.jones@linaro.org>
81 lines
2 KiB
C
81 lines
2 KiB
C
/*
|
|
* 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 = 0x400,
|
|
};
|
|
|
|
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 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");
|