1 #ifndef __LINUX_TI_AM335X_TSCADC_MFD_H
2 #define __LINUX_TI_AM335X_TSCADC_MFD_H
5 * TI Touch Screen / ADC MFD driver
7 * Copyright (C) 2012 Texas Instruments Incorporated - http://www.ti.com/
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.
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.
19 #include <linux/mfd/core.h>
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_CTRL 0x040
27 #define REG_ADCFSM 0x044
28 #define REG_CLKDIV 0x04C
30 #define REG_IDLECONFIG 0x058
31 #define REG_CHARGECONFIG 0x05C
32 #define REG_CHARGEDELAY 0x060
33 #define REG_STEPCONFIG(n) (0x64 + ((n) * 8))
34 #define REG_STEPDELAY(n) (0x68 + ((n) * 8))
35 #define REG_FIFO0CNT 0xE4
36 #define REG_FIFO0THR 0xE8
37 #define REG_FIFO1CNT 0xF0
38 #define REG_FIFO1THR 0xF4
39 #define REG_FIFO0 0x100
40 #define REG_FIFO1 0x200
42 /* Register Bitfields */
43 /* IRQ wakeup enable */
44 #define IRQWKUP_ENB BIT(0)
47 #define STEPENB_MASK (0x1FFFF << 0)
48 #define STEPENB(val) ((val) << 0)
49 #define ENB(val) (1 << (val))
50 #define STPENB_STEPENB STEPENB(0x1FFFF)
51 #define STPENB_STEPENB_TC STEPENB(0x1FFF)
54 #define IRQENB_HW_PEN BIT(0)
55 #define IRQENB_EOS BIT(1)
56 #define IRQENB_FIFO0THRES BIT(2)
57 #define IRQENB_FIFO0OVRRUN BIT(3)
58 #define IRQENB_FIFO0UNDRFLW BIT(4)
59 #define IRQENB_FIFO1THRES BIT(5)
60 #define IRQENB_FIFO1OVRRUN BIT(6)
61 #define IRQENB_FIFO1UNDRFLW BIT(7)
62 #define IRQENB_PENUP BIT(9)
64 /* Step Configuration */
65 #define STEPCONFIG_MODE_MASK (3 << 0)
66 #define STEPCONFIG_MODE(val) ((val) << 0)
67 #define STEPCONFIG_MODE_SWCNT STEPCONFIG_MODE(1)
68 #define STEPCONFIG_MODE_HWSYNC STEPCONFIG_MODE(2)
69 #define STEPCONFIG_AVG_MASK (7 << 2)
70 #define STEPCONFIG_AVG(val) ((val) << 2)
71 #define STEPCONFIG_AVG_16 STEPCONFIG_AVG(4)
72 #define STEPCONFIG_XPP BIT(5)
73 #define STEPCONFIG_XNN BIT(6)
74 #define STEPCONFIG_YPP BIT(7)
75 #define STEPCONFIG_YNN BIT(8)
76 #define STEPCONFIG_XNP BIT(9)
77 #define STEPCONFIG_YPN BIT(10)
78 #define STEPCONFIG_INM_MASK (0xF << 15)
79 #define STEPCONFIG_INM(val) ((val) << 15)
80 #define STEPCONFIG_INM_ADCREFM STEPCONFIG_INM(8)
81 #define STEPCONFIG_INP_MASK (0xF << 19)
82 #define STEPCONFIG_INP(val) ((val) << 19)
83 #define STEPCONFIG_INP_AN4 STEPCONFIG_INP(4)
84 #define STEPCONFIG_INP_ADCREFM STEPCONFIG_INP(8)
85 #define STEPCONFIG_FIFO1 BIT(26)
88 #define STEPDELAY_OPEN_MASK (0x3FFFF << 0)
89 #define STEPDELAY_OPEN(val) ((val) << 0)
90 #define STEPCONFIG_OPENDLY STEPDELAY_OPEN(0x098)
91 #define STEPDELAY_SAMPLE_MASK (0xFF << 24)
92 #define STEPDELAY_SAMPLE(val) ((val) << 24)
93 #define STEPCONFIG_SAMPLEDLY STEPDELAY_SAMPLE(0)
96 #define STEPCHARGE_RFP_MASK (7 << 12)
97 #define STEPCHARGE_RFP(val) ((val) << 12)
98 #define STEPCHARGE_RFP_XPUL STEPCHARGE_RFP(1)
99 #define STEPCHARGE_INM_MASK (0xF << 15)
100 #define STEPCHARGE_INM(val) ((val) << 15)
101 #define STEPCHARGE_INM_AN1 STEPCHARGE_INM(1)
102 #define STEPCHARGE_INP_MASK (0xF << 19)
103 #define STEPCHARGE_INP(val) ((val) << 19)
104 #define STEPCHARGE_RFM_MASK (3 << 23)
105 #define STEPCHARGE_RFM(val) ((val) << 23)
106 #define STEPCHARGE_RFM_XNUR STEPCHARGE_RFM(1)
109 #define CHARGEDLY_OPEN_MASK (0x3FFFF << 0)
110 #define CHARGEDLY_OPEN(val) ((val) << 0)
111 #define CHARGEDLY_OPENDLY CHARGEDLY_OPEN(0x400)
113 /* Control register */
114 #define CNTRLREG_TSCSSENB BIT(0)
115 #define CNTRLREG_STEPID BIT(1)
116 #define CNTRLREG_STEPCONFIGWRT BIT(2)
117 #define CNTRLREG_POWERDOWN BIT(4)
118 #define CNTRLREG_AFE_CTRL_MASK (3 << 5)
119 #define CNTRLREG_AFE_CTRL(val) ((val) << 5)
120 #define CNTRLREG_4WIRE CNTRLREG_AFE_CTRL(1)
121 #define CNTRLREG_5WIRE CNTRLREG_AFE_CTRL(2)
122 #define CNTRLREG_8WIRE CNTRLREG_AFE_CTRL(3)
123 #define CNTRLREG_TSCENB BIT(7)
125 /* FIFO READ Register */
126 #define FIFOREAD_DATA_MASK (0xfff << 0)
127 #define FIFOREAD_CHNLID_MASK (0xf << 16)
129 /* Sequencer Status */
130 #define SEQ_STATUS BIT(5)
131 #define CHARGE_STEP 0x11
133 #define ADC_CLK 3000000
134 #define TOTAL_STEPS 16
135 #define TOTAL_CHANNELS 8
136 #define FIFO1_THRESHOLD 19
139 * time in us for processing a single channel, calculated as follows:
141 * num cycles = open delay + (sample delay + conv time) * averaging
143 * num cycles: 152 + (1 + 13) * 16 = 376
145 * clock frequency: 26MHz / 8 = 3.25MHz
146 * clock period: 1 / 3.25MHz = 308ns
148 * processing time: 376 * 308ns = 116us
150 #define IDLE_TIMEOUT 116 /* microsec */
152 #define TSCADC_CELLS 2
154 struct ti_tscadc_dev {
156 struct regmap *regmap_tscadc;
157 void __iomem *tscadc_base;
159 int used_cells; /* 1-2 */
161 int tsc_cell; /* -1 if not used */
162 int adc_cell; /* -1 if not used */
163 struct mfd_cell cells[TSCADC_CELLS];
167 wait_queue_head_t reg_se_wait;
169 unsigned int clk_div;
175 struct adc_device *adc;
178 static inline struct ti_tscadc_dev *ti_tscadc_dev_get(struct platform_device *p)
180 struct ti_tscadc_dev **tscadc_dev = p->dev.platform_data;
185 void am335x_tsc_se_set_cache(struct ti_tscadc_dev *tsadc, u32 val);
186 void am335x_tsc_se_set_once(struct ti_tscadc_dev *tsadc, u32 val);
187 void am335x_tsc_se_clr(struct ti_tscadc_dev *tsadc, u32 val);
188 void am335x_tsc_se_adc_done(struct ti_tscadc_dev *tsadc);