1 #ifndef __LINUX_TI_AM335X_TSCADC_MFD_H 2 #define __LINUX_TI_AM335X_TSCADC_MFD_H 3 4 /* 5 * TI Touch Screen / ADC MFD driver 6 * 7 * Copyright (C) 2012 Texas Instruments Incorporated - https://www.ti.com/ 8 * 9 * This program is free software; you can redistribute it and/or 10 * modify it under the terms of the GNU General Public License as 11 * published by the Free Software Foundation version 2. 12 * 13 * This program is distributed "as is" WITHOUT ANY WARRANTY of any 14 * kind, whether express or implied; without even the implied warranty 15 * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 16 * GNU General Public License for more details. 17 */ 18 19 #include <linux/mfd/core.h> 20 21 #define REG_RAWIRQSTATUS 0x024 22 #define REG_IRQSTATUS 0x028 23 #define REG_IRQENABLE 0x02C 24 #define REG_IRQCLR 0x030 25 #define REG_IRQWAKEUP 0x034 26 #define REG_DMAENABLE_SET 0x038 27 #define REG_DMAENABLE_CLEAR 0x03c 28 #define REG_CTRL 0x040 29 #define REG_ADCFSM 0x044 30 #define REG_CLKDIV 0x04C 31 #define REG_SE 0x054 32 #define REG_IDLECONFIG 0x058 33 #define REG_CHARGECONFIG 0x05C 34 #define REG_CHARGEDELAY 0x060 35 #define REG_STEPCONFIG(n) (0x64 + ((n) * 8)) 36 #define REG_STEPDELAY(n) (0x68 + ((n) * 8)) 37 #define REG_FIFO0CNT 0xE4 38 #define REG_FIFO0THR 0xE8 39 #define REG_FIFO1CNT 0xF0 40 #define REG_FIFO1THR 0xF4 41 #define REG_DMA1REQ 0xF8 42 #define REG_FIFO0 0x100 43 #define REG_FIFO1 0x200 44 45 /* Register Bitfields */ 46 /* IRQ wakeup enable */ 47 #define IRQWKUP_ENB BIT(0) 48 49 /* Step Enable */ 50 #define STEPENB_MASK (0x1FFFF << 0) 51 #define STEPENB(val) ((val) << 0) 52 #define ENB(val) (1 << (val)) 53 #define STPENB_STEPENB STEPENB(0x1FFFF) 54 #define STPENB_STEPENB_TC STEPENB(0x1FFF) 55 56 /* IRQ enable */ 57 #define IRQENB_HW_PEN BIT(0) 58 #define IRQENB_EOS BIT(1) 59 #define IRQENB_FIFO0THRES BIT(2) 60 #define IRQENB_FIFO0OVRRUN BIT(3) 61 #define IRQENB_FIFO0UNDRFLW BIT(4) 62 #define IRQENB_FIFO1THRES BIT(5) 63 #define IRQENB_FIFO1OVRRUN BIT(6) 64 #define IRQENB_FIFO1UNDRFLW BIT(7) 65 #define IRQENB_PENUP BIT(9) 66 67 /* Step Configuration */ 68 #define STEPCONFIG_MODE_MASK (3 << 0) 69 #define STEPCONFIG_MODE(val) ((val) << 0) 70 #define STEPCONFIG_MODE_SWCNT STEPCONFIG_MODE(1) 71 #define STEPCONFIG_MODE_HWSYNC STEPCONFIG_MODE(2) 72 #define STEPCONFIG_AVG_MASK (7 << 2) 73 #define STEPCONFIG_AVG(val) ((val) << 2) 74 #define STEPCONFIG_AVG_16 STEPCONFIG_AVG(4) 75 #define STEPCONFIG_XPP BIT(5) 76 #define STEPCONFIG_XNN BIT(6) 77 #define STEPCONFIG_YPP BIT(7) 78 #define STEPCONFIG_YNN BIT(8) 79 #define STEPCONFIG_XNP BIT(9) 80 #define STEPCONFIG_YPN BIT(10) 81 #define STEPCONFIG_RFP(val) ((val) << 12) 82 #define STEPCONFIG_RFP_VREFP (0x3 << 12) 83 #define STEPCONFIG_INM_MASK (0xF << 15) 84 #define STEPCONFIG_INM(val) ((val) << 15) 85 #define STEPCONFIG_INM_ADCREFM STEPCONFIG_INM(8) 86 #define STEPCONFIG_INP_MASK (0xF << 19) 87 #define STEPCONFIG_INP(val) ((val) << 19) 88 #define STEPCONFIG_INP_AN4 STEPCONFIG_INP(4) 89 #define STEPCONFIG_INP_ADCREFM STEPCONFIG_INP(8) 90 #define STEPCONFIG_FIFO1 BIT(26) 91 #define STEPCONFIG_RFM(val) ((val) << 23) 92 #define STEPCONFIG_RFM_VREFN (0x3 << 23) 93 94 /* Delay register */ 95 #define STEPDELAY_OPEN_MASK (0x3FFFF << 0) 96 #define STEPDELAY_OPEN(val) ((val) << 0) 97 #define STEPCONFIG_OPENDLY STEPDELAY_OPEN(0x098) 98 #define STEPDELAY_SAMPLE_MASK (0xFF << 24) 99 #define STEPDELAY_SAMPLE(val) ((val) << 24) 100 #define STEPCONFIG_SAMPLEDLY STEPDELAY_SAMPLE(0) 101 102 /* Charge Config */ 103 #define STEPCHARGE_RFP_MASK (7 << 12) 104 #define STEPCHARGE_RFP(val) ((val) << 12) 105 #define STEPCHARGE_RFP_XPUL STEPCHARGE_RFP(1) 106 #define STEPCHARGE_INM_MASK (0xF << 15) 107 #define STEPCHARGE_INM(val) ((val) << 15) 108 #define STEPCHARGE_INM_AN1 STEPCHARGE_INM(1) 109 #define STEPCHARGE_INP_MASK (0xF << 19) 110 #define STEPCHARGE_INP(val) ((val) << 19) 111 #define STEPCHARGE_RFM_MASK (3 << 23) 112 #define STEPCHARGE_RFM(val) ((val) << 23) 113 #define STEPCHARGE_RFM_XNUR STEPCHARGE_RFM(1) 114 115 /* Charge delay */ 116 #define CHARGEDLY_OPEN_MASK (0x3FFFF << 0) 117 #define CHARGEDLY_OPEN(val) ((val) << 0) 118 #define CHARGEDLY_OPENDLY CHARGEDLY_OPEN(0x400) 119 120 /* Control register */ 121 #define CNTRLREG_TSCSSENB BIT(0) 122 #define CNTRLREG_STEPID BIT(1) 123 #define CNTRLREG_STEPCONFIGWRT BIT(2) 124 #define CNTRLREG_POWERDOWN BIT(4) 125 #define CNTRLREG_AFE_CTRL_MASK (3 << 5) 126 #define CNTRLREG_AFE_CTRL(val) ((val) << 5) 127 #define CNTRLREG_4WIRE CNTRLREG_AFE_CTRL(1) 128 #define CNTRLREG_5WIRE CNTRLREG_AFE_CTRL(2) 129 #define CNTRLREG_8WIRE CNTRLREG_AFE_CTRL(3) 130 #define CNTRLREG_TSCENB BIT(7) 131 132 /* FIFO READ Register */ 133 #define FIFOREAD_DATA_MASK (0xfff << 0) 134 #define FIFOREAD_CHNLID_MASK (0xf << 16) 135 136 /* DMA ENABLE/CLEAR Register */ 137 #define DMA_FIFO0 BIT(0) 138 #define DMA_FIFO1 BIT(1) 139 140 /* Sequencer Status */ 141 #define SEQ_STATUS BIT(5) 142 #define CHARGE_STEP 0x11 143 144 #define ADC_CLK 3000000 145 #define TOTAL_STEPS 16 146 #define TOTAL_CHANNELS 8 147 #define FIFO1_THRESHOLD 19 148 149 /* 150 * time in us for processing a single channel, calculated as follows: 151 * 152 * max num cycles = open delay + (sample delay + conv time) * averaging 153 * 154 * max num cycles: 262143 + (255 + 13) * 16 = 266431 155 * 156 * clock frequency: 26MHz / 8 = 3.25MHz 157 * clock period: 1 / 3.25MHz = 308ns 158 * 159 * max processing time: 266431 * 308ns = 83ms(approx) 160 */ 161 #define IDLE_TIMEOUT 83 /* milliseconds */ 162 163 #define TSCADC_CELLS 2 164 165 struct ti_tscadc_dev { 166 struct device *dev; 167 struct regmap *regmap; 168 void __iomem *tscadc_base; 169 phys_addr_t tscadc_phys_base; 170 int irq; 171 int used_cells; /* 1-2 */ 172 int tsc_wires; 173 int tsc_cell; /* -1 if not used */ 174 int adc_cell; /* -1 if not used */ 175 struct mfd_cell cells[TSCADC_CELLS]; 176 u32 reg_se_cache; 177 bool adc_waiting; 178 bool adc_in_use; 179 wait_queue_head_t reg_se_wait; 180 spinlock_t reg_lock; 181 unsigned int clk_div; 182 183 /* tsc device */ 184 struct titsc *tsc; 185 186 /* adc device */ 187 struct adc_device *adc; 188 }; 189 190 static inline struct ti_tscadc_dev *ti_tscadc_dev_get(struct platform_device *p) 191 { 192 struct ti_tscadc_dev **tscadc_dev = p->dev.platform_data; 193 194 return *tscadc_dev; 195 } 196 197 void am335x_tsc_se_set_cache(struct ti_tscadc_dev *tsadc, u32 val); 198 void am335x_tsc_se_set_once(struct ti_tscadc_dev *tsadc, u32 val); 199 void am335x_tsc_se_clr(struct ti_tscadc_dev *tsadc, u32 val); 200 void am335x_tsc_se_adc_done(struct ti_tscadc_dev *tsadc); 201 202 #endif 203