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/*
* Freescale MXS Low Resolution Analog-to-Digital Converter driver
*
* Copyright (c) 2012 DENX Software Engineering, GmbH.
* Copyright (c) 2016 Ksenija Stanojevic <ksenija.stanojevic@gmail.com>
*
* Author: Marek Vasut <marex@denx.de>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*/
#ifndef __MFD_MXS_LRADC_H
#define __MFD_MXS_LRADC_H
#include <linux/bitops.h>
#include <linux/io.h>
#include <linux/stmp_device.h>
#define LRADC_MAX_DELAY_CHANS 4
#define LRADC_MAX_MAPPED_CHANS 8
#define LRADC_MAX_TOTAL_CHANS 16
#define LRADC_DELAY_TIMER_HZ 2000
#define LRADC_CTRL0 0x00
# define LRADC_CTRL0_MX28_TOUCH_DETECT_ENABLE BIT(23)
# define LRADC_CTRL0_MX28_TOUCH_SCREEN_TYPE BIT(22)
# define LRADC_CTRL0_MX28_YNNSW /* YM */ BIT(21)
# define LRADC_CTRL0_MX28_YPNSW /* YP */ BIT(20)
# define LRADC_CTRL0_MX28_YPPSW /* YP */ BIT(19)
# define LRADC_CTRL0_MX28_XNNSW /* XM */ BIT(18)
# define LRADC_CTRL0_MX28_XNPSW /* XM */ BIT(17)
# define LRADC_CTRL0_MX28_XPPSW /* XP */ BIT(16)
# define LRADC_CTRL0_MX23_TOUCH_DETECT_ENABLE BIT(20)
# define LRADC_CTRL0_MX23_YM BIT(19)
# define LRADC_CTRL0_MX23_XM BIT(18)
# define LRADC_CTRL0_MX23_YP BIT(17)
# define LRADC_CTRL0_MX23_XP BIT(16)
# define LRADC_CTRL0_MX28_PLATE_MASK \
(LRADC_CTRL0_MX28_TOUCH_DETECT_ENABLE | \
LRADC_CTRL0_MX28_YNNSW | LRADC_CTRL0_MX28_YPNSW | \
LRADC_CTRL0_MX28_YPPSW | LRADC_CTRL0_MX28_XNNSW | \
LRADC_CTRL0_MX28_XNPSW | LRADC_CTRL0_MX28_XPPSW)
# define LRADC_CTRL0_MX23_PLATE_MASK \
(LRADC_CTRL0_MX23_TOUCH_DETECT_ENABLE | \
LRADC_CTRL0_MX23_YM | LRADC_CTRL0_MX23_XM | \
LRADC_CTRL0_MX23_YP | LRADC_CTRL0_MX23_XP)
#define LRADC_CTRL1 0x10
#define LRADC_CTRL1_TOUCH_DETECT_IRQ_EN BIT(24)
#define LRADC_CTRL1_LRADC_IRQ_EN(n) (1 << ((n) + 16))
#define LRADC_CTRL1_MX28_LRADC_IRQ_EN_MASK (0x1fff << 16)
#define LRADC_CTRL1_MX23_LRADC_IRQ_EN_MASK (0x01ff << 16)
#define LRADC_CTRL1_LRADC_IRQ_EN_OFFSET 16
#define LRADC_CTRL1_TOUCH_DETECT_IRQ BIT(8)
#define LRADC_CTRL1_LRADC_IRQ(n) BIT(n)
#define LRADC_CTRL1_MX28_LRADC_IRQ_MASK 0x1fff
#define LRADC_CTRL1_MX23_LRADC_IRQ_MASK 0x01ff
#define LRADC_CTRL1_LRADC_IRQ_OFFSET 0
#define LRADC_CTRL2 0x20
#define LRADC_CTRL2_DIVIDE_BY_TWO_OFFSET 24
#define LRADC_CTRL2_TEMPSENSE_PWD BIT(15)
#define LRADC_STATUS 0x40
#define LRADC_STATUS_TOUCH_DETECT_RAW BIT(0)
#define LRADC_CH(n) (0x50 + (0x10 * (n)))
#define LRADC_CH_ACCUMULATE BIT(29)
#define LRADC_CH_NUM_SAMPLES_MASK (0x1f << 24)
#define LRADC_CH_NUM_SAMPLES_OFFSET 24
#define LRADC_CH_NUM_SAMPLES(x) \
((x) << LRADC_CH_NUM_SAMPLES_OFFSET)
#define LRADC_CH_VALUE_MASK 0x3ffff
#define LRADC_CH_VALUE_OFFSET 0
#define LRADC_DELAY(n) (0xd0 + (0x10 * (n)))
#define LRADC_DELAY_TRIGGER_LRADCS_MASK (0xffUL << 24)
#define LRADC_DELAY_TRIGGER_LRADCS_OFFSET 24
#define LRADC_DELAY_TRIGGER(x) \
(((x) << LRADC_DELAY_TRIGGER_LRADCS_OFFSET) & \
LRADC_DELAY_TRIGGER_LRADCS_MASK)
#define LRADC_DELAY_KICK BIT(20)
#define LRADC_DELAY_TRIGGER_DELAYS_MASK (0xf << 16)
#define LRADC_DELAY_TRIGGER_DELAYS_OFFSET 16
#define LRADC_DELAY_TRIGGER_DELAYS(x) \
(((x) << LRADC_DELAY_TRIGGER_DELAYS_OFFSET) & \
LRADC_DELAY_TRIGGER_DELAYS_MASK)
#define LRADC_DELAY_LOOP_COUNT_MASK (0x1f << 11)
#define LRADC_DELAY_LOOP_COUNT_OFFSET 11
#define LRADC_DELAY_LOOP(x) \
(((x) << LRADC_DELAY_LOOP_COUNT_OFFSET) & \
LRADC_DELAY_LOOP_COUNT_MASK)
#define LRADC_DELAY_DELAY_MASK 0x7ff
#define LRADC_DELAY_DELAY_OFFSET 0
#define LRADC_DELAY_DELAY(x) \
(((x) << LRADC_DELAY_DELAY_OFFSET) & \
LRADC_DELAY_DELAY_MASK)
#define LRADC_CTRL4 0x140
#define LRADC_CTRL4_LRADCSELECT_MASK(n) (0xf << ((n) * 4))
#define LRADC_CTRL4_LRADCSELECT_OFFSET(n) ((n) * 4)
#define LRADC_CTRL4_LRADCSELECT(n, x) \
(((x) << LRADC_CTRL4_LRADCSELECT_OFFSET(n)) & \
LRADC_CTRL4_LRADCSELECT_MASK(n))
#define LRADC_RESOLUTION 12
#define LRADC_SINGLE_SAMPLE_MASK ((1 << LRADC_RESOLUTION) - 1)
#define BUFFER_VCHANS_LIMITED 0x3f
#define BUFFER_VCHANS_ALL 0xff
/*
* Certain LRADC channels are shared between touchscreen
* and/or touch-buttons and generic LRADC block. Therefore when using
* either of these, these channels are not available for the regular
* sampling. The shared channels are as follows:
*
* CH0 -- Touch button #0
* CH1 -- Touch button #1
* CH2 -- Touch screen XPUL
* CH3 -- Touch screen YPLL
* CH4 -- Touch screen XNUL
* CH5 -- Touch screen YNLR
* CH6 -- Touch screen WIPER (5-wire only)
*
* The bit fields below represents which parts of the LRADC block are
* switched into special mode of operation. These channels can not
* be sampled as regular LRADC channels. The driver will refuse any
* attempt to sample these channels.
*/
#define CHAN_MASK_TOUCHBUTTON (BIT(1) | BIT(0))
#define CHAN_MASK_TOUCHSCREEN_4WIRE (0xf << 2)
#define CHAN_MASK_TOUCHSCREEN_5WIRE (0x1f << 2)
enum mxs_lradc_id {
IMX23_LRADC,
IMX28_LRADC,
};
enum mxs_lradc_ts_wires {
MXS_LRADC_TOUCHSCREEN_NONE = 0,
MXS_LRADC_TOUCHSCREEN_4WIRE,
MXS_LRADC_TOUCHSCREEN_5WIRE,
};
/**
* struct mxs_lradc
* @soc: soc type (IMX23 or IMX28)
* @clk: 2 kHz clock for delay units
* @buffer_vchans: channels that can be used during buffered capture
* @touchscreen_wire: touchscreen type (4-wire or 5-wire)
* @use_touchbutton: button state (on or off)
*/
struct mxs_lradc {
enum mxs_lradc_id soc;
struct clk *clk;
u8 buffer_vchans;
enum mxs_lradc_ts_wires touchscreen_wire;
bool use_touchbutton;
};
static inline u32 mxs_lradc_irq_mask(struct mxs_lradc *lradc)
{
switch (lradc->soc) {
case IMX23_LRADC:
return LRADC_CTRL1_MX23_LRADC_IRQ_MASK;
case IMX28_LRADC:
return LRADC_CTRL1_MX28_LRADC_IRQ_MASK;
default:
return 0;
}
}
#endif /* __MXS_LRADC_H */
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