1 // SPDX-License-Identifier: GPL-2.0 2 /* 3 * Copyright (C) STMicroelectronics 2016 4 * Author: Benjamin Gaignard <benjamin.gaignard@st.com> 5 */ 6 7 #include <linux/mfd/stm32-timers.h> 8 #include <linux/module.h> 9 #include <linux/of_platform.h> 10 #include <linux/reset.h> 11 12 static const struct regmap_config stm32_timers_regmap_cfg = { 13 .reg_bits = 32, 14 .val_bits = 32, 15 .reg_stride = sizeof(u32), 16 .max_register = 0x3fc, 17 }; 18 19 static void stm32_timers_get_arr_size(struct stm32_timers *ddata) 20 { 21 /* 22 * Only the available bits will be written so when readback 23 * we get the maximum value of auto reload register 24 */ 25 regmap_write(ddata->regmap, TIM_ARR, ~0L); 26 regmap_read(ddata->regmap, TIM_ARR, &ddata->max_arr); 27 regmap_write(ddata->regmap, TIM_ARR, 0x0); 28 } 29 30 static int stm32_timers_probe(struct platform_device *pdev) 31 { 32 struct device *dev = &pdev->dev; 33 struct stm32_timers *ddata; 34 struct resource *res; 35 void __iomem *mmio; 36 37 ddata = devm_kzalloc(dev, sizeof(*ddata), GFP_KERNEL); 38 if (!ddata) 39 return -ENOMEM; 40 41 res = platform_get_resource(pdev, IORESOURCE_MEM, 0); 42 mmio = devm_ioremap_resource(dev, res); 43 if (IS_ERR(mmio)) 44 return PTR_ERR(mmio); 45 46 ddata->regmap = devm_regmap_init_mmio_clk(dev, "int", mmio, 47 &stm32_timers_regmap_cfg); 48 if (IS_ERR(ddata->regmap)) 49 return PTR_ERR(ddata->regmap); 50 51 ddata->clk = devm_clk_get(dev, NULL); 52 if (IS_ERR(ddata->clk)) 53 return PTR_ERR(ddata->clk); 54 55 stm32_timers_get_arr_size(ddata); 56 57 platform_set_drvdata(pdev, ddata); 58 59 return devm_of_platform_populate(&pdev->dev); 60 } 61 62 static const struct of_device_id stm32_timers_of_match[] = { 63 { .compatible = "st,stm32-timers", }, 64 { /* end node */ }, 65 }; 66 MODULE_DEVICE_TABLE(of, stm32_timers_of_match); 67 68 static struct platform_driver stm32_timers_driver = { 69 .probe = stm32_timers_probe, 70 .driver = { 71 .name = "stm32-timers", 72 .of_match_table = stm32_timers_of_match, 73 }, 74 }; 75 module_platform_driver(stm32_timers_driver); 76 77 MODULE_DESCRIPTION("STMicroelectronics STM32 Timers"); 78 MODULE_LICENSE("GPL v2"); 79