LXR linux/include/linux/mfd/stm32-timers.h

   1/* SPDX-License-Identifier: GPL-2.0 */
   2/*
   3 * Copyright (C) STMicroelectronics 2016
   4 * Author: Benjamin Gaignard <benjamin.gaignard@st.com>
   5 */
   6
   7#ifndef _LINUX_STM32_GPTIMER_H_
   8#define _LINUX_STM32_GPTIMER_H_
   9
  10#include <linux/clk.h>
  11#include <linux/dmaengine.h>
  12#include <linux/dma-mapping.h>
  13#include <linux/regmap.h>
  14
  15#define TIM_CR1         0x00    /* Control Register 1      */
  16#define TIM_CR2         0x04    /* Control Register 2      */
  17#define TIM_SMCR        0x08    /* Slave mode control reg  */
  18#define TIM_DIER        0x0C    /* DMA/interrupt register  */
  19#define TIM_SR          0x10    /* Status register         */
  20#define TIM_EGR         0x14    /* Event Generation Reg    */
  21#define TIM_CCMR1       0x18    /* Capt/Comp 1 Mode Reg    */
  22#define TIM_CCMR2       0x1C    /* Capt/Comp 2 Mode Reg    */
  23#define TIM_CCER        0x20    /* Capt/Comp Enable Reg    */
  24#define TIM_CNT         0x24    /* Counter                 */
  25#define TIM_PSC         0x28    /* Prescaler               */
  26#define TIM_ARR         0x2c    /* Auto-Reload Register    */
  27#define TIM_CCR1        0x34    /* Capt/Comp Register 1    */
  28#define TIM_CCR2        0x38    /* Capt/Comp Register 2    */
  29#define TIM_CCR3        0x3C    /* Capt/Comp Register 3    */
  30#define TIM_CCR4        0x40    /* Capt/Comp Register 4    */
  31#define TIM_BDTR        0x44    /* Break and Dead-Time Reg */
  32#define TIM_DCR         0x48    /* DMA control register    */
  33#define TIM_DMAR        0x4C    /* DMA register for transfer */
  34
  35#define TIM_CR1_CEN     BIT(0)  /* Counter Enable          */
  36#define TIM_CR1_DIR     BIT(4)  /* Counter Direction       */
  37#define TIM_CR1_ARPE    BIT(7)  /* Auto-reload Preload Ena */
  38#define TIM_CR2_MMS     (BIT(4) | BIT(5) | BIT(6)) /* Master mode selection */
  39#define TIM_CR2_MMS2    GENMASK(23, 20) /* Master mode selection 2 */
  40#define TIM_SMCR_SMS    (BIT(0) | BIT(1) | BIT(2)) /* Slave mode selection */
  41#define TIM_SMCR_TS     (BIT(4) | BIT(5) | BIT(6)) /* Trigger selection */
  42#define TIM_DIER_UIE    BIT(0)  /* Update interrupt        */
  43#define TIM_DIER_UDE    BIT(8)  /* Update DMA request Enable */
  44#define TIM_DIER_CC1DE  BIT(9)  /* CC1 DMA request Enable  */
  45#define TIM_DIER_CC2DE  BIT(10) /* CC2 DMA request Enable  */
  46#define TIM_DIER_CC3DE  BIT(11) /* CC3 DMA request Enable  */
  47#define TIM_DIER_CC4DE  BIT(12) /* CC4 DMA request Enable  */
  48#define TIM_DIER_COMDE  BIT(13) /* COM DMA request Enable  */
  49#define TIM_DIER_TDE    BIT(14) /* Trigger DMA request Enable */
  50#define TIM_SR_UIF      BIT(0)  /* Update interrupt flag   */
  51#define TIM_EGR_UG      BIT(0)  /* Update Generation       */
  52#define TIM_CCMR_PE     BIT(3)  /* Channel Preload Enable  */
  53#define TIM_CCMR_M1     (BIT(6) | BIT(5))  /* Channel PWM Mode 1 */
  54#define TIM_CCMR_CC1S           (BIT(0) | BIT(1)) /* Capture/compare 1 sel */
  55#define TIM_CCMR_IC1PSC         GENMASK(3, 2)   /* Input capture 1 prescaler */
  56#define TIM_CCMR_CC2S           (BIT(8) | BIT(9)) /* Capture/compare 2 sel */
  57#define TIM_CCMR_IC2PSC         GENMASK(11, 10) /* Input capture 2 prescaler */
  58#define TIM_CCMR_CC1S_TI1       BIT(0)  /* IC1/IC3 selects TI1/TI3 */
  59#define TIM_CCMR_CC1S_TI2       BIT(1)  /* IC1/IC3 selects TI2/TI4 */
  60#define TIM_CCMR_CC2S_TI2       BIT(8)  /* IC2/IC4 selects TI2/TI4 */
  61#define TIM_CCMR_CC2S_TI1       BIT(9)  /* IC2/IC4 selects TI1/TI3 */
  62#define TIM_CCER_CC1E   BIT(0)  /* Capt/Comp 1  out Ena    */
  63#define TIM_CCER_CC1P   BIT(1)  /* Capt/Comp 1  Polarity   */
  64#define TIM_CCER_CC1NE  BIT(2)  /* Capt/Comp 1N out Ena    */
  65#define TIM_CCER_CC1NP  BIT(3)  /* Capt/Comp 1N Polarity   */
  66#define TIM_CCER_CC2E   BIT(4)  /* Capt/Comp 2  out Ena    */
  67#define TIM_CCER_CC2P   BIT(5)  /* Capt/Comp 2  Polarity   */
  68#define TIM_CCER_CC3E   BIT(8)  /* Capt/Comp 3  out Ena    */
  69#define TIM_CCER_CC3P   BIT(9)  /* Capt/Comp 3  Polarity   */
  70#define TIM_CCER_CC4E   BIT(12) /* Capt/Comp 4  out Ena    */
  71#define TIM_CCER_CC4P   BIT(13) /* Capt/Comp 4  Polarity   */
  72#define TIM_CCER_CCXE   (BIT(0) | BIT(4) | BIT(8) | BIT(12))
  73#define TIM_BDTR_BKE(x) BIT(12 + (x) * 12) /* Break input enable */
  74#define TIM_BDTR_BKP(x) BIT(13 + (x) * 12) /* Break input polarity */
  75#define TIM_BDTR_AOE    BIT(14) /* Automatic Output Enable */
  76#define TIM_BDTR_MOE    BIT(15) /* Main Output Enable      */
  77#define TIM_BDTR_BKF(x) (0xf << (16 + (x) * 4))
  78#define TIM_DCR_DBA     GENMASK(4, 0)   /* DMA base addr */
  79#define TIM_DCR_DBL     GENMASK(12, 8)  /* DMA burst len */
  80
  81#define MAX_TIM_PSC             0xFFFF
  82#define MAX_TIM_ICPSC           0x3
  83#define TIM_CR2_MMS_SHIFT       4
  84#define TIM_CR2_MMS2_SHIFT      20
  85#define TIM_SMCR_TS_SHIFT       4
  86#define TIM_BDTR_BKF_MASK       0xF
  87#define TIM_BDTR_BKF_SHIFT(x)   (16 + (x) * 4)
  88
  89enum stm32_timers_dmas {
  90        STM32_TIMERS_DMA_CH1,
  91        STM32_TIMERS_DMA_CH2,
  92        STM32_TIMERS_DMA_CH3,
  93        STM32_TIMERS_DMA_CH4,
  94        STM32_TIMERS_DMA_UP,
  95        STM32_TIMERS_DMA_TRIG,
  96        STM32_TIMERS_DMA_COM,
  97        STM32_TIMERS_MAX_DMAS,
  98};
  99
 100/**
 101 * struct stm32_timers_dma - STM32 timer DMA handling.
 102 * @completion:         end of DMA transfer completion
 103 * @phys_base:          control registers physical base address
 104 * @lock:               protect DMA access
 105 * @chan:               DMA channel in use
 106 * @chans:              DMA channels available for this timer instance
 107 */
 108struct stm32_timers_dma {
 109        struct completion completion;
 110        phys_addr_t phys_base;
 111        struct mutex lock;
 112        struct dma_chan *chan;
 113        struct dma_chan *chans[STM32_TIMERS_MAX_DMAS];
 114};
 115
 116struct stm32_timers {
 117        struct clk *clk;
 118        struct regmap *regmap;
 119        u32 max_arr;
 120        struct stm32_timers_dma dma; /* Only to be used by the parent */
 121};
 122
 123#if IS_REACHABLE(CONFIG_MFD_STM32_TIMERS)
 124int stm32_timers_dma_burst_read(struct device *dev, u32 *buf,
 125                                enum stm32_timers_dmas id, u32 reg,
 126                                unsigned int num_reg, unsigned int bursts,
 127                                unsigned long tmo_ms);
 128#else
 129static inline int stm32_timers_dma_burst_read(struct device *dev, u32 *buf,
 130                                              enum stm32_timers_dmas id,
 131                                              u32 reg,
 132                                              unsigned int num_reg,
 133                                              unsigned int bursts,
 134                                              unsigned long tmo_ms)
 135{
 136        return -ENODEV;
 137}
 138#endif
 139#endif
 140