1 /* 2 * Freescale MXS Low Resolution Analog-to-Digital Converter driver 3 * 4 * Copyright (c) 2012 DENX Software Engineering, GmbH. 5 * Copyright (c) 2016 Ksenija Stanojevic <ksenija.stanojevic@gmail.com> 6 * 7 * Author: Marek Vasut <marex@denx.de> 8 * 9 * This program is free software; you can redistribute it and/or modify 10 * it under the terms of the GNU General Public License as published by 11 * the Free Software Foundation; either version 2 of the License, or 12 * (at your option) any later version. 13 * 14 * This program is distributed in the hope that it will be useful, 15 * but WITHOUT ANY WARRANTY; without even the implied warranty of 16 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 17 * GNU General Public License for more details. 18 */ 19 20 #ifndef __MFD_MXS_LRADC_H 21 #define __MFD_MXS_LRADC_H 22 23 #include <linux/bitops.h> 24 #include <linux/io.h> 25 #include <linux/stmp_device.h> 26 27 #define LRADC_MAX_DELAY_CHANS 4 28 #define LRADC_MAX_MAPPED_CHANS 8 29 #define LRADC_MAX_TOTAL_CHANS 16 30 31 #define LRADC_DELAY_TIMER_HZ 2000 32 33 #define LRADC_CTRL0 0x00 34 # define LRADC_CTRL0_MX28_TOUCH_DETECT_ENABLE BIT(23) 35 # define LRADC_CTRL0_MX28_TOUCH_SCREEN_TYPE BIT(22) 36 # define LRADC_CTRL0_MX28_YNNSW /* YM */ BIT(21) 37 # define LRADC_CTRL0_MX28_YPNSW /* YP */ BIT(20) 38 # define LRADC_CTRL0_MX28_YPPSW /* YP */ BIT(19) 39 # define LRADC_CTRL0_MX28_XNNSW /* XM */ BIT(18) 40 # define LRADC_CTRL0_MX28_XNPSW /* XM */ BIT(17) 41 # define LRADC_CTRL0_MX28_XPPSW /* XP */ BIT(16) 42 43 # define LRADC_CTRL0_MX23_TOUCH_DETECT_ENABLE BIT(20) 44 # define LRADC_CTRL0_MX23_YM BIT(19) 45 # define LRADC_CTRL0_MX23_XM BIT(18) 46 # define LRADC_CTRL0_MX23_YP BIT(17) 47 # define LRADC_CTRL0_MX23_XP BIT(16) 48 49 # define LRADC_CTRL0_MX28_PLATE_MASK \ 50 (LRADC_CTRL0_MX28_TOUCH_DETECT_ENABLE | \ 51 LRADC_CTRL0_MX28_YNNSW | LRADC_CTRL0_MX28_YPNSW | \ 52 LRADC_CTRL0_MX28_YPPSW | LRADC_CTRL0_MX28_XNNSW | \ 53 LRADC_CTRL0_MX28_XNPSW | LRADC_CTRL0_MX28_XPPSW) 54 55 # define LRADC_CTRL0_MX23_PLATE_MASK \ 56 (LRADC_CTRL0_MX23_TOUCH_DETECT_ENABLE | \ 57 LRADC_CTRL0_MX23_YM | LRADC_CTRL0_MX23_XM | \ 58 LRADC_CTRL0_MX23_YP | LRADC_CTRL0_MX23_XP) 59 60 #define LRADC_CTRL1 0x10 61 #define LRADC_CTRL1_TOUCH_DETECT_IRQ_EN BIT(24) 62 #define LRADC_CTRL1_LRADC_IRQ_EN(n) (1 << ((n) + 16)) 63 #define LRADC_CTRL1_MX28_LRADC_IRQ_EN_MASK (0x1fff << 16) 64 #define LRADC_CTRL1_MX23_LRADC_IRQ_EN_MASK (0x01ff << 16) 65 #define LRADC_CTRL1_LRADC_IRQ_EN_OFFSET 16 66 #define LRADC_CTRL1_TOUCH_DETECT_IRQ BIT(8) 67 #define LRADC_CTRL1_LRADC_IRQ(n) BIT(n) 68 #define LRADC_CTRL1_MX28_LRADC_IRQ_MASK 0x1fff 69 #define LRADC_CTRL1_MX23_LRADC_IRQ_MASK 0x01ff 70 #define LRADC_CTRL1_LRADC_IRQ_OFFSET 0 71 72 #define LRADC_CTRL2 0x20 73 #define LRADC_CTRL2_DIVIDE_BY_TWO_OFFSET 24 74 #define LRADC_CTRL2_TEMPSENSE_PWD BIT(15) 75 76 #define LRADC_STATUS 0x40 77 #define LRADC_STATUS_TOUCH_DETECT_RAW BIT(0) 78 79 #define LRADC_CH(n) (0x50 + (0x10 * (n))) 80 #define LRADC_CH_ACCUMULATE BIT(29) 81 #define LRADC_CH_NUM_SAMPLES_MASK (0x1f << 24) 82 #define LRADC_CH_NUM_SAMPLES_OFFSET 24 83 #define LRADC_CH_NUM_SAMPLES(x) \ 84 ((x) << LRADC_CH_NUM_SAMPLES_OFFSET) 85 #define LRADC_CH_VALUE_MASK 0x3ffff 86 #define LRADC_CH_VALUE_OFFSET 0 87 88 #define LRADC_DELAY(n) (0xd0 + (0x10 * (n))) 89 #define LRADC_DELAY_TRIGGER_LRADCS_MASK (0xffUL << 24) 90 #define LRADC_DELAY_TRIGGER_LRADCS_OFFSET 24 91 #define LRADC_DELAY_TRIGGER(x) \ 92 (((x) << LRADC_DELAY_TRIGGER_LRADCS_OFFSET) & \ 93 LRADC_DELAY_TRIGGER_LRADCS_MASK) 94 #define LRADC_DELAY_KICK BIT(20) 95 #define LRADC_DELAY_TRIGGER_DELAYS_MASK (0xf << 16) 96 #define LRADC_DELAY_TRIGGER_DELAYS_OFFSET 16 97 #define LRADC_DELAY_TRIGGER_DELAYS(x) \ 98 (((x) << LRADC_DELAY_TRIGGER_DELAYS_OFFSET) & \ 99 LRADC_DELAY_TRIGGER_DELAYS_MASK) 100 #define LRADC_DELAY_LOOP_COUNT_MASK (0x1f << 11) 101 #define LRADC_DELAY_LOOP_COUNT_OFFSET 11 102 #define LRADC_DELAY_LOOP(x) \ 103 (((x) << LRADC_DELAY_LOOP_COUNT_OFFSET) & \ 104 LRADC_DELAY_LOOP_COUNT_MASK) 105 #define LRADC_DELAY_DELAY_MASK 0x7ff 106 #define LRADC_DELAY_DELAY_OFFSET 0 107 #define LRADC_DELAY_DELAY(x) \ 108 (((x) << LRADC_DELAY_DELAY_OFFSET) & \ 109 LRADC_DELAY_DELAY_MASK) 110 111 #define LRADC_CTRL4 0x140 112 #define LRADC_CTRL4_LRADCSELECT_MASK(n) (0xf << ((n) * 4)) 113 #define LRADC_CTRL4_LRADCSELECT_OFFSET(n) ((n) * 4) 114 #define LRADC_CTRL4_LRADCSELECT(n, x) \ 115 (((x) << LRADC_CTRL4_LRADCSELECT_OFFSET(n)) & \ 116 LRADC_CTRL4_LRADCSELECT_MASK(n)) 117 118 #define LRADC_RESOLUTION 12 119 #define LRADC_SINGLE_SAMPLE_MASK ((1 << LRADC_RESOLUTION) - 1) 120 121 #define BUFFER_VCHANS_LIMITED 0x3f 122 #define BUFFER_VCHANS_ALL 0xff 123 124 /* 125 * Certain LRADC channels are shared between touchscreen 126 * and/or touch-buttons and generic LRADC block. Therefore when using 127 * either of these, these channels are not available for the regular 128 * sampling. The shared channels are as follows: 129 * 130 * CH0 -- Touch button #0 131 * CH1 -- Touch button #1 132 * CH2 -- Touch screen XPUL 133 * CH3 -- Touch screen YPLL 134 * CH4 -- Touch screen XNUL 135 * CH5 -- Touch screen YNLR 136 * CH6 -- Touch screen WIPER (5-wire only) 137 * 138 * The bit fields below represents which parts of the LRADC block are 139 * switched into special mode of operation. These channels can not 140 * be sampled as regular LRADC channels. The driver will refuse any 141 * attempt to sample these channels. 142 */ 143 #define CHAN_MASK_TOUCHBUTTON (BIT(1) | BIT(0)) 144 #define CHAN_MASK_TOUCHSCREEN_4WIRE (0xf << 2) 145 #define CHAN_MASK_TOUCHSCREEN_5WIRE (0x1f << 2) 146 147 enum mxs_lradc_id { 148 IMX23_LRADC, 149 IMX28_LRADC, 150 }; 151 152 enum mxs_lradc_ts_wires { 153 MXS_LRADC_TOUCHSCREEN_NONE = 0, 154 MXS_LRADC_TOUCHSCREEN_4WIRE, 155 MXS_LRADC_TOUCHSCREEN_5WIRE, 156 }; 157 158 /** 159 * struct mxs_lradc 160 * @soc: soc type (IMX23 or IMX28) 161 * @clk: 2 kHz clock for delay units 162 * @buffer_vchans: channels that can be used during buffered capture 163 * @touchscreen_wire: touchscreen type (4-wire or 5-wire) 164 * @use_touchbutton: button state (on or off) 165 */ 166 struct mxs_lradc { 167 enum mxs_lradc_id soc; 168 struct clk *clk; 169 u8 buffer_vchans; 170 171 enum mxs_lradc_ts_wires touchscreen_wire; 172 bool use_touchbutton; 173 }; 174 175 static inline u32 mxs_lradc_irq_mask(struct mxs_lradc *lradc) 176 { 177 switch (lradc->soc) { 178 case IMX23_LRADC: 179 return LRADC_CTRL1_MX23_LRADC_IRQ_MASK; 180 case IMX28_LRADC: 181 return LRADC_CTRL1_MX28_LRADC_IRQ_MASK; 182 default: 183 return 0; 184 } 185 } 186 187 #endif /* __MXS_LRADC_H */ 188