include/linux/mfd/ti_am335x_tscadc.h

   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 - http://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_INM_MASK     (0xF << 15)
  82 #define STEPCONFIG_INM(val)     ((val) << 15)
  83 #define STEPCONFIG_INM_ADCREFM  STEPCONFIG_INM(8)
  84 #define STEPCONFIG_INP_MASK     (0xF << 19)
  85 #define STEPCONFIG_INP(val)     ((val) << 19)
  86 #define STEPCONFIG_INP_AN4      STEPCONFIG_INP(4)
  87 #define STEPCONFIG_INP_ADCREFM  STEPCONFIG_INP(8)
  88 #define STEPCONFIG_FIFO1        BIT(26)
  89
  90 /* Delay register */
  91 #define STEPDELAY_OPEN_MASK     (0x3FFFF << 0)
  92 #define STEPDELAY_OPEN(val)     ((val) << 0)
  93 #define STEPCONFIG_OPENDLY      STEPDELAY_OPEN(0x098)
  94 #define STEPDELAY_SAMPLE_MASK   (0xFF << 24)
  95 #define STEPDELAY_SAMPLE(val)   ((val) << 24)
  96 #define STEPCONFIG_SAMPLEDLY    STEPDELAY_SAMPLE(0)
  97
  98 /* Charge Config */
  99 #define STEPCHARGE_RFP_MASK     (7 << 12)
 100 #define STEPCHARGE_RFP(val)     ((val) << 12)
 101 #define STEPCHARGE_RFP_XPUL     STEPCHARGE_RFP(1)
 102 #define STEPCHARGE_INM_MASK     (0xF << 15)
 103 #define STEPCHARGE_INM(val)     ((val) << 15)
 104 #define STEPCHARGE_INM_AN1      STEPCHARGE_INM(1)
 105 #define STEPCHARGE_INP_MASK     (0xF << 19)
 106 #define STEPCHARGE_INP(val)     ((val) << 19)
 107 #define STEPCHARGE_RFM_MASK     (3 << 23)
 108 #define STEPCHARGE_RFM(val)     ((val) << 23)
 109 #define STEPCHARGE_RFM_XNUR     STEPCHARGE_RFM(1)
 110
 111 /* Charge delay */
 112 #define CHARGEDLY_OPEN_MASK     (0x3FFFF << 0)
 113 #define CHARGEDLY_OPEN(val)     ((val) << 0)
 114 #define CHARGEDLY_OPENDLY       CHARGEDLY_OPEN(0x400)
 115
 116 /* Control register */
 117 #define CNTRLREG_TSCSSENB       BIT(0)
 118 #define CNTRLREG_STEPID         BIT(1)
 119 #define CNTRLREG_STEPCONFIGWRT  BIT(2)
 120 #define CNTRLREG_POWERDOWN      BIT(4)
 121 #define CNTRLREG_AFE_CTRL_MASK  (3 << 5)
 122 #define CNTRLREG_AFE_CTRL(val)  ((val) << 5)
 123 #define CNTRLREG_4WIRE          CNTRLREG_AFE_CTRL(1)
 124 #define CNTRLREG_5WIRE          CNTRLREG_AFE_CTRL(2)
 125 #define CNTRLREG_8WIRE          CNTRLREG_AFE_CTRL(3)
 126 #define CNTRLREG_TSCENB         BIT(7)
 127
 128 /* FIFO READ Register */
 129 #define FIFOREAD_DATA_MASK (0xfff << 0)
 130 #define FIFOREAD_CHNLID_MASK (0xf << 16)
 131
 132 /* DMA ENABLE/CLEAR Register */
 133 #define DMA_FIFO0               BIT(0)
 134 #define DMA_FIFO1               BIT(1)
 135
 136 /* Sequencer Status */
 137 #define SEQ_STATUS BIT(5)
 138 #define CHARGE_STEP             0x11
 139
 140 #define ADC_CLK                 3000000
 141 #define TOTAL_STEPS             16
 142 #define TOTAL_CHANNELS          8
 143 #define FIFO1_THRESHOLD         19
 144
 145 /*
 146  * time in us for processing a single channel, calculated as follows:
 147  *
 148  * max num cycles = open delay + (sample delay + conv time) * averaging
 149  *
 150  * max num cycles: 262143 + (255 + 13) * 16 = 266431
 151  *
 152  * clock frequency: 26MHz / 8 = 3.25MHz
 153  * clock period: 1 / 3.25MHz = 308ns
 154  *
 155  * max processing time: 266431 * 308ns = 83ms(approx)
 156  */
 157 #define IDLE_TIMEOUT 83 /* milliseconds */
 158
 159 #define TSCADC_CELLS            2
 160
 161 struct ti_tscadc_dev {
 162         struct device *dev;
 163         struct regmap *regmap;
 164         void __iomem *tscadc_base;
 165         phys_addr_t tscadc_phys_base;
 166         int irq;
 167         int used_cells; /* 1-2 */
 168         int tsc_wires;
 169         int tsc_cell;   /* -1 if not used */
 170         int adc_cell;   /* -1 if not used */
 171         struct mfd_cell cells[TSCADC_CELLS];
 172         u32 reg_se_cache;
 173         bool adc_waiting;
 174         bool adc_in_use;
 175         wait_queue_head_t reg_se_wait;
 176         spinlock_t reg_lock;
 177         unsigned int clk_div;
 178
 179         /* tsc device */
 180         struct titsc *tsc;
 181
 182         /* adc device */
 183         struct adc_device *adc;
 184 };
 185
 186 static inline struct ti_tscadc_dev *ti_tscadc_dev_get(struct platform_device *p)
 187 {
 188         struct ti_tscadc_dev **tscadc_dev = p->dev.platform_data;
 189
 190         return *tscadc_dev;
 191 }
 192
 193 void am335x_tsc_se_set_cache(struct ti_tscadc_dev *tsadc, u32 val);
 194 void am335x_tsc_se_set_once(struct ti_tscadc_dev *tsadc, u32 val);
 195 void am335x_tsc_se_clr(struct ti_tscadc_dev *tsadc, u32 val);
 196 void am335x_tsc_se_adc_done(struct ti_tscadc_dev *tsadc);
 197
 198 #endif