xref: /openbmc/linux/include/linux/mfd/mxs-lradc.h (revision c942fddf)
1 /* SPDX-License-Identifier: GPL-2.0-or-later */
2 /*
3  * Freescale MXS Low Resolution Analog-to-Digital Converter driver
4  *
5  * Copyright (c) 2012 DENX Software Engineering, GmbH.
6  * Copyright (c) 2016 Ksenija Stanojevic <ksenija.stanojevic@gmail.com>
7  *
8  * Author: Marek Vasut <marex@denx.de>
9  */
10 
11 #ifndef __MFD_MXS_LRADC_H
12 #define __MFD_MXS_LRADC_H
13 
14 #include <linux/bitops.h>
15 #include <linux/io.h>
16 #include <linux/stmp_device.h>
17 
18 #define LRADC_MAX_DELAY_CHANS	4
19 #define LRADC_MAX_MAPPED_CHANS	8
20 #define LRADC_MAX_TOTAL_CHANS	16
21 
22 #define LRADC_DELAY_TIMER_HZ	2000
23 
24 #define LRADC_CTRL0				0x00
25 # define LRADC_CTRL0_MX28_TOUCH_DETECT_ENABLE	BIT(23)
26 # define LRADC_CTRL0_MX28_TOUCH_SCREEN_TYPE	BIT(22)
27 # define LRADC_CTRL0_MX28_YNNSW /* YM */	BIT(21)
28 # define LRADC_CTRL0_MX28_YPNSW /* YP */	BIT(20)
29 # define LRADC_CTRL0_MX28_YPPSW /* YP */	BIT(19)
30 # define LRADC_CTRL0_MX28_XNNSW /* XM */	BIT(18)
31 # define LRADC_CTRL0_MX28_XNPSW /* XM */	BIT(17)
32 # define LRADC_CTRL0_MX28_XPPSW /* XP */	BIT(16)
33 
34 # define LRADC_CTRL0_MX23_TOUCH_DETECT_ENABLE	BIT(20)
35 # define LRADC_CTRL0_MX23_YM			BIT(19)
36 # define LRADC_CTRL0_MX23_XM			BIT(18)
37 # define LRADC_CTRL0_MX23_YP			BIT(17)
38 # define LRADC_CTRL0_MX23_XP			BIT(16)
39 
40 # define LRADC_CTRL0_MX28_PLATE_MASK \
41 		(LRADC_CTRL0_MX28_TOUCH_DETECT_ENABLE | \
42 		LRADC_CTRL0_MX28_YNNSW | LRADC_CTRL0_MX28_YPNSW | \
43 		LRADC_CTRL0_MX28_YPPSW | LRADC_CTRL0_MX28_XNNSW | \
44 		LRADC_CTRL0_MX28_XNPSW | LRADC_CTRL0_MX28_XPPSW)
45 
46 # define LRADC_CTRL0_MX23_PLATE_MASK \
47 		(LRADC_CTRL0_MX23_TOUCH_DETECT_ENABLE | \
48 		LRADC_CTRL0_MX23_YM | LRADC_CTRL0_MX23_XM | \
49 		LRADC_CTRL0_MX23_YP | LRADC_CTRL0_MX23_XP)
50 
51 #define LRADC_CTRL1				0x10
52 #define LRADC_CTRL1_TOUCH_DETECT_IRQ_EN		BIT(24)
53 #define LRADC_CTRL1_LRADC_IRQ_EN(n)		(1 << ((n) + 16))
54 #define LRADC_CTRL1_MX28_LRADC_IRQ_EN_MASK	(0x1fff << 16)
55 #define LRADC_CTRL1_MX23_LRADC_IRQ_EN_MASK	(0x01ff << 16)
56 #define LRADC_CTRL1_LRADC_IRQ_EN_OFFSET		16
57 #define LRADC_CTRL1_TOUCH_DETECT_IRQ		BIT(8)
58 #define LRADC_CTRL1_LRADC_IRQ(n)		BIT(n)
59 #define LRADC_CTRL1_MX28_LRADC_IRQ_MASK		0x1fff
60 #define LRADC_CTRL1_MX23_LRADC_IRQ_MASK		0x01ff
61 #define LRADC_CTRL1_LRADC_IRQ_OFFSET		0
62 
63 #define LRADC_CTRL2				0x20
64 #define LRADC_CTRL2_DIVIDE_BY_TWO_OFFSET	24
65 #define LRADC_CTRL2_TEMPSENSE_PWD		BIT(15)
66 
67 #define LRADC_STATUS				0x40
68 #define LRADC_STATUS_TOUCH_DETECT_RAW		BIT(0)
69 
70 #define LRADC_CH(n)				(0x50 + (0x10 * (n)))
71 #define LRADC_CH_ACCUMULATE			BIT(29)
72 #define LRADC_CH_NUM_SAMPLES_MASK		(0x1f << 24)
73 #define LRADC_CH_NUM_SAMPLES_OFFSET		24
74 #define LRADC_CH_NUM_SAMPLES(x) \
75 				((x) << LRADC_CH_NUM_SAMPLES_OFFSET)
76 #define LRADC_CH_VALUE_MASK			0x3ffff
77 #define LRADC_CH_VALUE_OFFSET			0
78 
79 #define LRADC_DELAY(n)				(0xd0 + (0x10 * (n)))
80 #define LRADC_DELAY_TRIGGER_LRADCS_MASK		(0xffUL << 24)
81 #define LRADC_DELAY_TRIGGER_LRADCS_OFFSET	24
82 #define LRADC_DELAY_TRIGGER(x) \
83 				(((x) << LRADC_DELAY_TRIGGER_LRADCS_OFFSET) & \
84 				LRADC_DELAY_TRIGGER_LRADCS_MASK)
85 #define LRADC_DELAY_KICK			BIT(20)
86 #define LRADC_DELAY_TRIGGER_DELAYS_MASK		(0xf << 16)
87 #define LRADC_DELAY_TRIGGER_DELAYS_OFFSET	16
88 #define LRADC_DELAY_TRIGGER_DELAYS(x) \
89 				(((x) << LRADC_DELAY_TRIGGER_DELAYS_OFFSET) & \
90 				LRADC_DELAY_TRIGGER_DELAYS_MASK)
91 #define LRADC_DELAY_LOOP_COUNT_MASK		(0x1f << 11)
92 #define LRADC_DELAY_LOOP_COUNT_OFFSET		11
93 #define LRADC_DELAY_LOOP(x) \
94 				(((x) << LRADC_DELAY_LOOP_COUNT_OFFSET) & \
95 				LRADC_DELAY_LOOP_COUNT_MASK)
96 #define LRADC_DELAY_DELAY_MASK			0x7ff
97 #define LRADC_DELAY_DELAY_OFFSET		0
98 #define LRADC_DELAY_DELAY(x) \
99 				(((x) << LRADC_DELAY_DELAY_OFFSET) & \
100 				LRADC_DELAY_DELAY_MASK)
101 
102 #define LRADC_CTRL4				0x140
103 #define LRADC_CTRL4_LRADCSELECT_MASK(n)		(0xf << ((n) * 4))
104 #define LRADC_CTRL4_LRADCSELECT_OFFSET(n)	((n) * 4)
105 #define LRADC_CTRL4_LRADCSELECT(n, x) \
106 				(((x) << LRADC_CTRL4_LRADCSELECT_OFFSET(n)) & \
107 				LRADC_CTRL4_LRADCSELECT_MASK(n))
108 
109 #define LRADC_RESOLUTION			12
110 #define LRADC_SINGLE_SAMPLE_MASK		((1 << LRADC_RESOLUTION) - 1)
111 
112 #define BUFFER_VCHANS_LIMITED		0x3f
113 #define BUFFER_VCHANS_ALL		0xff
114 
115 	/*
116 	 * Certain LRADC channels are shared between touchscreen
117 	 * and/or touch-buttons and generic LRADC block. Therefore when using
118 	 * either of these, these channels are not available for the regular
119 	 * sampling. The shared channels are as follows:
120 	 *
121 	 * CH0 -- Touch button #0
122 	 * CH1 -- Touch button #1
123 	 * CH2 -- Touch screen XPUL
124 	 * CH3 -- Touch screen YPLL
125 	 * CH4 -- Touch screen XNUL
126 	 * CH5 -- Touch screen YNLR
127 	 * CH6 -- Touch screen WIPER (5-wire only)
128 	 *
129 	 * The bit fields below represents which parts of the LRADC block are
130 	 * switched into special mode of operation. These channels can not
131 	 * be sampled as regular LRADC channels. The driver will refuse any
132 	 * attempt to sample these channels.
133 	 */
134 #define CHAN_MASK_TOUCHBUTTON		(BIT(1) | BIT(0))
135 #define CHAN_MASK_TOUCHSCREEN_4WIRE	(0xf << 2)
136 #define CHAN_MASK_TOUCHSCREEN_5WIRE	(0x1f << 2)
137 
138 enum mxs_lradc_id {
139 	IMX23_LRADC,
140 	IMX28_LRADC,
141 };
142 
143 enum mxs_lradc_ts_wires {
144 	MXS_LRADC_TOUCHSCREEN_NONE = 0,
145 	MXS_LRADC_TOUCHSCREEN_4WIRE,
146 	MXS_LRADC_TOUCHSCREEN_5WIRE,
147 };
148 
149 /**
150  * struct mxs_lradc
151  * @soc: soc type (IMX23 or IMX28)
152  * @clk: 2 kHz clock for delay units
153  * @buffer_vchans: channels that can be used during buffered capture
154  * @touchscreen_wire: touchscreen type (4-wire or 5-wire)
155  * @use_touchbutton: button state (on or off)
156  */
157 struct mxs_lradc {
158 	enum mxs_lradc_id	soc;
159 	struct clk		*clk;
160 	u8			buffer_vchans;
161 
162 	enum mxs_lradc_ts_wires	touchscreen_wire;
163 	bool			use_touchbutton;
164 };
165 
mxs_lradc_irq_mask(struct mxs_lradc * lradc)166 static inline u32 mxs_lradc_irq_mask(struct mxs_lradc *lradc)
167 {
168 	switch (lradc->soc) {
169 	case IMX23_LRADC:
170 		return LRADC_CTRL1_MX23_LRADC_IRQ_MASK;
171 	case IMX28_LRADC:
172 		return LRADC_CTRL1_MX28_LRADC_IRQ_MASK;
173 	default:
174 		return 0;
175 	}
176 }
177 
178 #endif /* __MXS_LRADC_H */
179