diff options
Diffstat (limited to 'drivers/media/rc/ir-hix5hd2.c')
| -rw-r--r-- | drivers/media/rc/ir-hix5hd2.c | 351 |
1 files changed, 351 insertions, 0 deletions
diff --git a/drivers/media/rc/ir-hix5hd2.c b/drivers/media/rc/ir-hix5hd2.c new file mode 100644 index 00000000000..08bbd4f508c --- /dev/null +++ b/drivers/media/rc/ir-hix5hd2.c @@ -0,0 +1,351 @@ +/* + * 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> + +/* Allow the driver to compile on all architectures */ +#ifndef writel_relaxed +# define writel_relaxed writel +#endif +#ifndef readl_relaxed +# define readl_relaxed readl +#endif + +#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 volatile __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; + + 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); +} + +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_err(dev, "no power-reg\n"); + return -EINVAL; + } + + res = platform_get_resource(pdev, IORESOURCE_MEM, 0); + priv->base = devm_ioremap_resource(dev, res); + if (IS_ERR((__force void *)priv->base)) + return PTR_ERR((__force void *)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(); + 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->driver_type = RC_DRIVER_IR_RAW; + rdev->allowed_protocols = RC_BIT_ALL; + 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, + IRQF_NO_SUSPEND, 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 +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 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"); |