linux-imx

/*

 * Driver for Amlogic Meson IR remote receiver

 *

 * Copyright (C) 2014 Beniamino Galvani <b.galvani@gmail.com>

 *

 * This program is free software; you can redistribute it and/or

 * modify it under the terms of the GNU General Public License

 * version 2 as published by the Free Software Foundation.

 *

 * You should have received a copy of the GNU General Public License

 * along with this program. If not, see <http://www.gnu.org/licenses/>.

 */

​

#include <linux/device.h>

#include <linux/err.h>

#include <linux/interrupt.h>

#include <linux/io.h>

#include <linux/module.h>

#include <linux/of_platform.h>

#include <linux/platform_device.h>

#include <linux/spinlock.h>

#include <linux/bitfield.h>

​

#include <media/rc-core.h>

​

#define DRIVER_NAME     "meson-ir"

​

/* valid on all Meson platforms */

#define IR_DEC_LDR_ACTIVE   0x00

#define IR_DEC_LDR_IDLE     0x04

#define IR_DEC_LDR_REPEAT   0x08

#define IR_DEC_BIT_0        0x0c

#define IR_DEC_REG0     0x10

#define IR_DEC_FRAME        0x14

#define IR_DEC_STATUS       0x18

#define IR_DEC_REG1     0x1c

/* only available on Meson 8b and newer */

#define IR_DEC_REG2     0x20

​

#define REG0_RATE_MASK      GENMASK(11, 0)

​

#define DECODE_MODE_NEC     0x0

#define DECODE_MODE_RAW     0x2

​

/* Meson 6b uses REG1 to configure the mode */

#define REG1_MODE_MASK      GENMASK(8, 7)

#define REG1_MODE_SHIFT     7

​

/* Meson 8b / GXBB use REG2 to configure the mode */

#define REG2_MODE_MASK      GENMASK(3, 0)

#define REG2_MODE_SHIFT     0

​

#define REG1_TIME_IV_MASK   GENMASK(28, 16)

​

#define REG1_IRQSEL_MASK    GENMASK(3, 2)

#define REG1_IRQSEL_NEC_MODE    0

#define REG1_IRQSEL_RISE_FALL   1

#define REG1_IRQSEL_FALL    2

#define REG1_IRQSEL_RISE    3

​

#define REG1_RESET      BIT(0)

#define REG1_ENABLE     BIT(15)

​

#define STATUS_IR_DEC_IN    BIT(8)

​

#define MESON_TRATE     10  /* us */

​

struct meson_ir {

    void __iomem    *reg;

    struct rc_dev   *rc;

    spinlock_t  lock;

};

​

static void meson_ir_set_mask(struct meson_ir *ir, unsigned int reg,

                  u32 mask, u32 value)

{

    u32 data;

​

    data = readl(ir->reg + reg);

    data &= ~mask;

    data |= (value & mask);

    writel(data, ir->reg + reg);

}

​

static irqreturn_t meson_ir_irq(int irqno, void *dev_id)

{

    struct meson_ir *ir = dev_id;

    u32 duration, status;

    struct ir_raw_event rawir = {};

​

    spin_lock(&ir->lock);

​