tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
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_CCRx(x) (0x34 + 4 * ((x) - 1)) /* Capt/Comp Register x (x ∈ {1, .. 4}) */
28#define TIM_CCR1 TIM_CCRx(1) /* Capt/Comp Register 1 */
29#define TIM_CCR2 TIM_CCRx(2) /* Capt/Comp Register 2 */
30#define TIM_CCR3 TIM_CCRx(3) /* Capt/Comp Register 3 */
31#define TIM_CCR4 TIM_CCRx(4) /* Capt/Comp Register 4 */
32#define TIM_BDTR 0x44 /* Break and Dead-Time Reg */
33#define TIM_DCR 0x48 /* DMA control register */
34#define TIM_DMAR 0x4C /* DMA register for transfer */
35#define TIM_TISEL 0x68 /* Input Selection */
36
37#define TIM_CR1_CEN BIT(0) /* Counter Enable */
38#define TIM_CR1_DIR BIT(4) /* Counter Direction */
39#define TIM_CR1_ARPE BIT(7) /* Auto-reload Preload Ena */
40#define TIM_CR2_MMS (BIT(4) | BIT(5) | BIT(6)) /* Master mode selection */
41#define TIM_CR2_MMS2 GENMASK(23, 20) /* Master mode selection 2 */
42#define TIM_SMCR_SMS (BIT(0) | BIT(1) | BIT(2)) /* Slave mode selection */
43#define TIM_SMCR_TS (BIT(4) | BIT(5) | BIT(6)) /* Trigger selection */
44#define TIM_DIER_UIE BIT(0) /* Update interrupt */
45#define TIM_DIER_CCxIE(x) BIT(1 + ((x) - 1)) /* CCx Interrupt Enable (x ∈ {1, .. 4}) */
46#define TIM_DIER_CC1IE TIM_DIER_CCxIE(1) /* CC1 Interrupt Enable */
47#define TIM_DIER_CC2IE TIM_DIER_CCxIE(2) /* CC2 Interrupt Enable */
48#define TIM_DIER_CC3IE TIM_DIER_CCxIE(3) /* CC3 Interrupt Enable */
49#define TIM_DIER_CC4IE TIM_DIER_CCxIE(4) /* CC4 Interrupt Enable */
50#define TIM_DIER_UDE BIT(8) /* Update DMA request Enable */
51#define TIM_DIER_CCxDE(x) BIT(9 + ((x) - 1)) /* CCx DMA request Enable (x ∈ {1, .. 4}) */
52#define TIM_DIER_CC1DE TIM_DIER_CCxDE(1) /* CC1 DMA request Enable */
53#define TIM_DIER_CC2DE TIM_DIER_CCxDE(2) /* CC2 DMA request Enable */
54#define TIM_DIER_CC3DE TIM_DIER_CCxDE(3) /* CC3 DMA request Enable */
55#define TIM_DIER_CC4DE TIM_DIER_CCxDE(4) /* CC4 DMA request Enable */
56#define TIM_DIER_COMDE BIT(13) /* COM DMA request Enable */
57#define TIM_DIER_TDE BIT(14) /* Trigger DMA request Enable */
58#define TIM_SR_UIF BIT(0) /* Update interrupt flag */
59#define TIM_SR_CC_IF(x) BIT((x) + 1) /* CC1, CC2, CC3, CC4 interrupt flag */
60#define TIM_EGR_UG BIT(0) /* Update Generation */
61#define TIM_CCMR_PE BIT(3) /* Channel Preload Enable */
62#define TIM_CCMR_M1 (BIT(6) | BIT(5)) /* Channel PWM Mode 1 */
63#define TIM_CCMR_CC1S (BIT(0) | BIT(1)) /* Capture/compare 1 sel */
64#define TIM_CCMR_IC1PSC GENMASK(3, 2) /* Input capture 1 prescaler */
65#define TIM_CCMR_CC2S (BIT(8) | BIT(9)) /* Capture/compare 2 sel */
66#define TIM_CCMR_IC2PSC GENMASK(11, 10) /* Input capture 2 prescaler */
67#define TIM_CCMR_CC1S_TI1 BIT(0) /* IC1/IC3 selects TI1/TI3 */
68#define TIM_CCMR_CC1S_TI2 BIT(1) /* IC1/IC3 selects TI2/TI4 */
69#define TIM_CCMR_CC2S_TI2 BIT(8) /* IC2/IC4 selects TI2/TI4 */
70#define TIM_CCMR_CC2S_TI1 BIT(9) /* IC2/IC4 selects TI1/TI3 */
71#define TIM_CCMR_CC3S (BIT(0) | BIT(1)) /* Capture/compare 3 sel */
72#define TIM_CCMR_CC4S (BIT(8) | BIT(9)) /* Capture/compare 4 sel */
73#define TIM_CCMR_CC3S_TI3 BIT(0) /* IC3 selects TI3 */
74#define TIM_CCMR_CC4S_TI4 BIT(8) /* IC4 selects TI4 */
75#define TIM_CCER_CCxE(x) BIT(0 + 4 * ((x) - 1)) /* Capt/Comp x out Ena (x ∈ {1, .. 4}) */
76#define TIM_CCER_CCxP(x) BIT(1 + 4 * ((x) - 1)) /* Capt/Comp x Polarity (x ∈ {1, .. 4}) */
77#define TIM_CCER_CCxNE(x) BIT(2 + 4 * ((x) - 1)) /* Capt/Comp xN out Ena (x ∈ {1, .. 4}) */
78#define TIM_CCER_CCxNP(x) BIT(3 + 4 * ((x) - 1)) /* Capt/Comp xN Polarity (x ∈ {1, .. 4}) */
79#define TIM_CCER_CC1E TIM_CCER_CCxE(1) /* Capt/Comp 1 out Ena */
80#define TIM_CCER_CC1P TIM_CCER_CCxP(1) /* Capt/Comp 1 Polarity */
81#define TIM_CCER_CC1NE TIM_CCER_CCxNE(1) /* Capt/Comp 1N out Ena */
82#define TIM_CCER_CC1NP TIM_CCER_CCxNP(1) /* Capt/Comp 1N Polarity */
83#define TIM_CCER_CC2E TIM_CCER_CCxE(2) /* Capt/Comp 2 out Ena */
84#define TIM_CCER_CC2P TIM_CCER_CCxP(2) /* Capt/Comp 2 Polarity */
85#define TIM_CCER_CC2NE TIM_CCER_CCxNE(2) /* Capt/Comp 2N out Ena */
86#define TIM_CCER_CC2NP TIM_CCER_CCxNP(2) /* Capt/Comp 2N Polarity */
87#define TIM_CCER_CC3E TIM_CCER_CCxE(3) /* Capt/Comp 3 out Ena */
88#define TIM_CCER_CC3P TIM_CCER_CCxP(3) /* Capt/Comp 3 Polarity */
89#define TIM_CCER_CC3NE TIM_CCER_CCxNE(3) /* Capt/Comp 3N out Ena */
90#define TIM_CCER_CC3NP TIM_CCER_CCxNP(3) /* Capt/Comp 3N Polarity */
91#define TIM_CCER_CC4E TIM_CCER_CCxE(4) /* Capt/Comp 4 out Ena */
92#define TIM_CCER_CC4P TIM_CCER_CCxP(4) /* Capt/Comp 4 Polarity */
93#define TIM_CCER_CC4NE TIM_CCER_CCxNE(4) /* Capt/Comp 4N out Ena */
94#define TIM_CCER_CC4NP TIM_CCER_CCxNP(4) /* Capt/Comp 4N Polarity */
95#define TIM_CCER_CCXE (BIT(0) | BIT(4) | BIT(8) | BIT(12))
96#define TIM_BDTR_BKE(x) BIT(12 + (x) * 12) /* Break input enable */
97#define TIM_BDTR_BKP(x) BIT(13 + (x) * 12) /* Break input polarity */
98#define TIM_BDTR_AOE BIT(14) /* Automatic Output Enable */
99#define TIM_BDTR_MOE BIT(15) /* Main Output Enable */
100#define TIM_BDTR_BKF(x) (0xf << (16 + (x) * 4))
101#define TIM_DCR_DBA GENMASK(4, 0) /* DMA base addr */
102#define TIM_DCR_DBL GENMASK(12, 8) /* DMA burst len */
103
104#define MAX_TIM_PSC 0xFFFF
105#define MAX_TIM_ICPSC 0x3
106#define TIM_CR2_MMS_SHIFT 4
107#define TIM_CR2_MMS2_SHIFT 20
108#define TIM_SMCR_SMS_SLAVE_MODE_DISABLED 0 /* counts on internal clock when CEN=1 */
109#define TIM_SMCR_SMS_ENCODER_MODE_1 1 /* counts TI1FP1 edges, depending on TI2FP2 level */
110#define TIM_SMCR_SMS_ENCODER_MODE_2 2 /* counts TI2FP2 edges, depending on TI1FP1 level */
111#define TIM_SMCR_SMS_ENCODER_MODE_3 3 /* counts on both TI1FP1 and TI2FP2 edges */
112#define TIM_SMCR_TS_SHIFT 4
113#define TIM_BDTR_BKF_MASK 0xF
114#define TIM_BDTR_BKF_SHIFT(x) (16 + (x) * 4)
115
116enum stm32_timers_dmas {
117 STM32_TIMERS_DMA_CH1,
118 STM32_TIMERS_DMA_CH2,
119 STM32_TIMERS_DMA_CH3,
120 STM32_TIMERS_DMA_CH4,
121 STM32_TIMERS_DMA_UP,
122 STM32_TIMERS_DMA_TRIG,
123 STM32_TIMERS_DMA_COM,
124 STM32_TIMERS_MAX_DMAS,
125};
126
127/* STM32 Timer may have either a unique global interrupt or 4 interrupt lines */
128enum stm32_timers_irqs {
129 STM32_TIMERS_IRQ_GLOBAL_BRK, /* global or brk IRQ */
130 STM32_TIMERS_IRQ_UP,
131 STM32_TIMERS_IRQ_TRG_COM,
132 STM32_TIMERS_IRQ_CC,
133 STM32_TIMERS_MAX_IRQS,
134};
135
136/**
137 * struct stm32_timers_dma - STM32 timer DMA handling.
138 * @completion: end of DMA transfer completion
139 * @phys_base: control registers physical base address
140 * @lock: protect DMA access
141 * @chan: DMA channel in use
142 * @chans: DMA channels available for this timer instance
143 */
144struct stm32_timers_dma {
145 struct completion completion;
146 phys_addr_t phys_base;
147 struct mutex lock;
148 struct dma_chan *chan;
149 struct dma_chan *chans[STM32_TIMERS_MAX_DMAS];
150};
151
152struct stm32_timers {
153 struct clk *clk;
154 struct regmap *regmap;
155 u32 max_arr;
156 struct stm32_timers_dma dma; /* Only to be used by the parent */
157 unsigned int nr_irqs;
158 int irq[STM32_TIMERS_MAX_IRQS];
159};
160
161#if IS_REACHABLE(CONFIG_MFD_STM32_TIMERS)
162int stm32_timers_dma_burst_read(struct device *dev, u32 *buf,
163 enum stm32_timers_dmas id, u32 reg,
164 unsigned int num_reg, unsigned int bursts,
165 unsigned long tmo_ms);
166#else
167static inline int stm32_timers_dma_burst_read(struct device *dev, u32 *buf,
168 enum stm32_timers_dmas id,
169 u32 reg,
170 unsigned int num_reg,
171 unsigned int bursts,
172 unsigned long tmo_ms)
173{
174 return -ENODEV;
175}
176#endif
177#endif