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linux-sg2042/drivers/media/rc/ir-hix5hd2.c

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/*
* Copyright (c) 2014 Linaro Ltd.
* Copyright (c) 2014 Hisilicon Limited.
*
* This program is free software; you can redistribute it and/or modify it
* under the terms and conditions of the GNU General Public License,
* version 2, as published by the Free Software Foundation.
*/
#include <linux/clk.h>
#include <linux/delay.h>
#include <linux/interrupt.h>
#include <linux/mfd/syscon.h>
#include <linux/module.h>
#include <linux/of_device.h>
#include <linux/regmap.h>
#include <media/rc-core.h>
#define IR_ENABLE 0x00
#define IR_CONFIG 0x04
#define CNT_LEADS 0x08
#define CNT_LEADE 0x0c
#define CNT_SLEADE 0x10
#define CNT0_B 0x14
#define CNT1_B 0x18
#define IR_BUSY 0x1c
#define IR_DATAH 0x20
#define IR_DATAL 0x24
#define IR_INTM 0x28
#define IR_INTS 0x2c
#define IR_INTC 0x30
#define IR_START 0x34
/* interrupt mask */
#define INTMS_SYMBRCV (BIT(24) | BIT(8))
#define INTMS_TIMEOUT (BIT(25) | BIT(9))
#define INTMS_OVERFLOW (BIT(26) | BIT(10))
#define INT_CLR_OVERFLOW BIT(18)
#define INT_CLR_TIMEOUT BIT(17)
#define INT_CLR_RCV BIT(16)
#define INT_CLR_RCVTIMEOUT (BIT(16) | BIT(17))
#define IR_CLK 0x48
#define IR_CLK_ENABLE BIT(4)
#define IR_CLK_RESET BIT(5)
#define IR_CFG_WIDTH_MASK 0xffff
#define IR_CFG_WIDTH_SHIFT 16
#define IR_CFG_FORMAT_MASK 0x3
#define IR_CFG_FORMAT_SHIFT 14
#define IR_CFG_INT_LEVEL_MASK 0x3f
#define IR_CFG_INT_LEVEL_SHIFT 8
/* only support raw mode */
#define IR_CFG_MODE_RAW BIT(7)
#define IR_CFG_FREQ_MASK 0x7f
#define IR_CFG_FREQ_SHIFT 0
#define IR_CFG_INT_THRESHOLD 1
/* symbol start from low to high, symbol stream end at high*/
#define IR_CFG_SYMBOL_FMT 0
#define IR_CFG_SYMBOL_MAXWIDTH 0x3e80
#define IR_HIX5HD2_NAME "hix5hd2-ir"
struct hix5hd2_ir_priv {
int irq;
void __iomem *base;
struct device *dev;
struct rc_dev *rdev;
struct regmap *regmap;
struct clk *clock;
unsigned long rate;
};
static void hix5hd2_ir_enable(struct hix5hd2_ir_priv *dev, bool on)
{
u32 val;
if (dev->regmap) {
regmap_read(dev->regmap, IR_CLK, &val);
if (on) {
val &= ~IR_CLK_RESET;
val |= IR_CLK_ENABLE;
} else {
val &= ~IR_CLK_ENABLE;
val |= IR_CLK_RESET;
}
regmap_write(dev->regmap, IR_CLK, val);
} else {
if (on)
clk_prepare_enable(dev->clock);
else
clk_disable_unprepare(dev->clock);
}
}
static int hix5hd2_ir_config(struct hix5hd2_ir_priv *priv)
{
int timeout = 10000;
u32 val, rate;
writel_relaxed(0x01, priv->base + IR_ENABLE);
while (readl_relaxed(priv->base + IR_BUSY)) {
if (timeout--) {
udelay(1);
} else {
dev_err(priv->dev, "IR_BUSY timeout\n");
return -ETIMEDOUT;
}
}
/* Now only support raw mode, with symbol start from low to high */
rate = DIV_ROUND_CLOSEST(priv->rate, 1000000);
val = IR_CFG_SYMBOL_MAXWIDTH & IR_CFG_WIDTH_MASK << IR_CFG_WIDTH_SHIFT;
val |= IR_CFG_SYMBOL_FMT & IR_CFG_FORMAT_MASK << IR_CFG_FORMAT_SHIFT;
val |= (IR_CFG_INT_THRESHOLD - 1) & IR_CFG_INT_LEVEL_MASK
<< IR_CFG_INT_LEVEL_SHIFT;
val |= IR_CFG_MODE_RAW;
val |= (rate - 1) & IR_CFG_FREQ_MASK << IR_CFG_FREQ_SHIFT;
writel_relaxed(val, priv->base + IR_CONFIG);
writel_relaxed(0x00, priv->base + IR_INTM);
/* write arbitrary value to start */
writel_relaxed(0x01, priv->base + IR_START);
return 0;
}
static int hix5hd2_ir_open(struct rc_dev *rdev)
{
struct hix5hd2_ir_priv *priv = rdev->priv;
hix5hd2_ir_enable(priv, true);
return hix5hd2_ir_config(priv);
}
static void hix5hd2_ir_close(struct rc_dev *rdev)
{
struct hix5hd2_ir_priv *priv = rdev->priv;
hix5hd2_ir_enable(priv, false);
}
static irqreturn_t hix5hd2_ir_rx_interrupt(int irq, void *data)
{
u32 symb_num, symb_val, symb_time;
u32 data_l, data_h;
u32 irq_sr, i;
struct hix5hd2_ir_priv *priv = data;
irq_sr = readl_relaxed(priv->base + IR_INTS);
if (irq_sr & INTMS_OVERFLOW) {
/*
* we must read IR_DATAL first, then we can clean up
* IR_INTS availably since logic would not clear
* fifo when overflow, drv do the job
*/
ir_raw_event_reset(priv->rdev);
symb_num = readl_relaxed(priv->base + IR_DATAH);
for (i = 0; i < symb_num; i++)
readl_relaxed(priv->base + IR_DATAL);
writel_relaxed(INT_CLR_OVERFLOW, priv->base + IR_INTC);
dev_info(priv->dev, "overflow, level=%d\n",
IR_CFG_INT_THRESHOLD);
}
if ((irq_sr & INTMS_SYMBRCV) || (irq_sr & INTMS_TIMEOUT)) {
DEFINE_IR_RAW_EVENT(ev);
symb_num = readl_relaxed(priv->base + IR_DATAH);
for (i = 0; i < symb_num; i++) {
symb_val = readl_relaxed(priv->base + IR_DATAL);
data_l = ((symb_val & 0xffff) * 10);
data_h = ((symb_val >> 16) & 0xffff) * 10;
symb_time = (data_l + data_h) / 10;
ev.duration = US_TO_NS(data_l);
ev.pulse = true;
ir_raw_event_store(priv->rdev, &ev);
if (symb_time < IR_CFG_SYMBOL_MAXWIDTH) {
ev.duration = US_TO_NS(data_h);
ev.pulse = false;
ir_raw_event_store(priv->rdev, &ev);
} else {
ir_raw_event_set_idle(priv->rdev, true);
}
}
if (irq_sr & INTMS_SYMBRCV)
writel_relaxed(INT_CLR_RCV, priv->base + IR_INTC);
if (irq_sr & INTMS_TIMEOUT)
writel_relaxed(INT_CLR_TIMEOUT, priv->base + IR_INTC);
}
/* Empty software fifo */
ir_raw_event_handle(priv->rdev);
return IRQ_HANDLED;
}
static int hix5hd2_ir_probe(struct platform_device *pdev)
{
struct rc_dev *rdev;
struct device *dev = &pdev->dev;
struct resource *res;
struct hix5hd2_ir_priv *priv;
struct device_node *node = pdev->dev.of_node;
const char *map_name;
int ret;
priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);
if (!priv)
return -ENOMEM;
priv->regmap = syscon_regmap_lookup_by_phandle(node,
"hisilicon,power-syscon");
if (IS_ERR(priv->regmap)) {
dev_info(dev, "no power-reg\n");
priv->regmap = NULL;
}
res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
priv->base = devm_ioremap_resource(dev, res);
if (IS_ERR(priv->base))
return PTR_ERR(priv->base);
priv->irq = platform_get_irq(pdev, 0);
if (priv->irq < 0) {
dev_err(dev, "irq can not get\n");
return priv->irq;
}
rdev = rc_allocate_device(RC_DRIVER_IR_RAW);
if (!rdev)
return -ENOMEM;
priv->clock = devm_clk_get(dev, NULL);
if (IS_ERR(priv->clock)) {
dev_err(dev, "clock not found\n");
ret = PTR_ERR(priv->clock);
goto err;
}
clk_prepare_enable(priv->clock);
priv->rate = clk_get_rate(priv->clock);
rdev->allowed_protocols = RC_BIT_ALL_IR_DECODER;
rdev->priv = priv;
rdev->open = hix5hd2_ir_open;
rdev->close = hix5hd2_ir_close;
rdev->driver_name = IR_HIX5HD2_NAME;
map_name = of_get_property(node, "linux,rc-map-name", NULL);
rdev->map_name = map_name ?: RC_MAP_EMPTY;
rdev->input_name = IR_HIX5HD2_NAME;
rdev->input_phys = IR_HIX5HD2_NAME "/input0";
rdev->input_id.bustype = BUS_HOST;
rdev->input_id.vendor = 0x0001;
rdev->input_id.product = 0x0001;
rdev->input_id.version = 0x0100;
rdev->rx_resolution = US_TO_NS(10);
rdev->timeout = US_TO_NS(IR_CFG_SYMBOL_MAXWIDTH * 10);
ret = rc_register_device(rdev);
if (ret < 0)
goto clkerr;
if (devm_request_irq(dev, priv->irq, hix5hd2_ir_rx_interrupt,
0, pdev->name, priv) < 0) {
dev_err(dev, "IRQ %d register failed\n", priv->irq);
ret = -EINVAL;
goto regerr;
}
priv->rdev = rdev;
priv->dev = dev;
platform_set_drvdata(pdev, priv);
return ret;
regerr:
rc_unregister_device(rdev);
rdev = NULL;
clkerr:
clk_disable_unprepare(priv->clock);
err:
rc_free_device(rdev);
dev_err(dev, "Unable to register device (%d)\n", ret);
return ret;
}
static int hix5hd2_ir_remove(struct platform_device *pdev)
{
struct hix5hd2_ir_priv *priv = platform_get_drvdata(pdev);
clk_disable_unprepare(priv->clock);
rc_unregister_device(priv->rdev);
return 0;
}
#ifdef CONFIG_PM_SLEEP
static int hix5hd2_ir_suspend(struct device *dev)
{
struct hix5hd2_ir_priv *priv = dev_get_drvdata(dev);
clk_disable_unprepare(priv->clock);
hix5hd2_ir_enable(priv, false);
return 0;
}
static int hix5hd2_ir_resume(struct device *dev)
{
struct hix5hd2_ir_priv *priv = dev_get_drvdata(dev);
hix5hd2_ir_enable(priv, true);
clk_prepare_enable(priv->clock);
writel_relaxed(0x01, priv->base + IR_ENABLE);
writel_relaxed(0x00, priv->base + IR_INTM);
writel_relaxed(0xff, priv->base + IR_INTC);
writel_relaxed(0x01, priv->base + IR_START);
return 0;
}
#endif
static SIMPLE_DEV_PM_OPS(hix5hd2_ir_pm_ops, hix5hd2_ir_suspend,
hix5hd2_ir_resume);
static const struct of_device_id hix5hd2_ir_table[] = {
{ .compatible = "hisilicon,hix5hd2-ir", },
{},
};
MODULE_DEVICE_TABLE(of, hix5hd2_ir_table);
static struct platform_driver hix5hd2_ir_driver = {
.driver = {
.name = IR_HIX5HD2_NAME,
.of_match_table = hix5hd2_ir_table,
.pm = &hix5hd2_ir_pm_ops,
},
.probe = hix5hd2_ir_probe,
.remove = hix5hd2_ir_remove,
};
module_platform_driver(hix5hd2_ir_driver);
MODULE_DESCRIPTION("IR controller driver for hix5hd2 platforms");
MODULE_AUTHOR("Guoxiong Yan <yanguoxiong@huawei.com>");
MODULE_LICENSE("GPL v2");
MODULE_ALIAS("platform:hix5hd2-ir");
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