From: Sean Wang <sean.wang@xxxxxxxxxxxx>
This patch adds driver for IR controller on
Mediatek MT7623 SoC. Currently testing successfully
on NEC and SONY remote controller only but it should
work on others (lirc, rc-5 and rc-6).
Signed-off-by: Sean Wang <sean.wang@xxxxxxxxxxxx>
---
drivers/media/rc/Kconfig | 10 ++
drivers/media/rc/Makefile | 1 +
drivers/media/rc/mtk-cir.c | 319 +++++++++++++++++++++++++++++++++++++++++++++
3 files changed, 330 insertions(+)
create mode 100644 linux-4.8.rc1_p0/drivers/media/rc/mtk-cir.c
diff --git a/drivers/media/rc/Kconfig b/drivers/media/rc/Kconfig
index 370e16e..626c500 100644
--- a/drivers/media/rc/Kconfig
+++ b/drivers/media/rc/Kconfig
@@ -389,4 +389,14 @@ config IR_SUNXI
To compile this driver as a module, choose M here: the module will
be called sunxi-ir.
+config IR_MTK
+ tristate "Mediatek IR remote control"
+ depends on RC_CORE
+ depends on ARCH_MEDIATEK || COMPILE_TEST
+ ---help---
+ Say Y if you want to use Mediatek internal IR Controller
+
+ To compile this driver as a module, choose M here: the module will
+ be called mtk-cir.
+
endif #RC_DEVICES
diff --git a/drivers/media/rc/Makefile b/drivers/media/rc/Makefile
index 379a5c0..505908d 100644
--- a/drivers/media/rc/Makefile
+++ b/drivers/media/rc/Makefile
@@ -37,3 +37,4 @@ obj-$(CONFIG_IR_TTUSBIR) += ttusbir.o
obj-$(CONFIG_RC_ST) += st_rc.o
obj-$(CONFIG_IR_SUNXI) += sunxi-cir.o
obj-$(CONFIG_IR_IMG) += img-ir/
+obj-$(CONFIG_IR_MTK) += mtk-cir.o
diff --git a/drivers/media/rc/mtk-cir.c b/drivers/media/rc/mtk-cir.c
new file mode 100644
index 0000000..4fa4cab
--- /dev/null
+++ b/drivers/media/rc/mtk-cir.c
@@ -0,0 +1,319 @@
+/*
+ * Driver for Mediatek MT7623 IR Receiver Controller
+ *
+ * Copyright (C) 2017 Sean Wang <sean.wang@xxxxxxxxxxxx>
+ *
+ * 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.
+ */
+
+#include <linux/clk.h>
+#include <linux/interrupt.h>
+#include <linux/module.h>
+#include <linux/of_platform.h>
+#include <linux/reset.h>
+#include <media/rc-core.h>
+
+#define MTK_IR_DEV "mtk-ir"
+
+/* Register to enable PWM and IR */
+#define MTK_CONFIG_HIGH_REG 0x0c
+/* Enable IR pulse width detection */
+#define MTK_PWM_EN BIT(13)
+/* Enable IR hardware function */
+#define MTK_IR_EN BIT(0)
+
+/* Register to setting sample period */
+#define MTK_CONFIG_LOW_REG 0x10
+/* Field to set sample period */
+#define CHK_PERIOD 0xC00
+#define MTK_CHK_PERIOD (((CHK_PERIOD) << 8) & (GENMASK(20, 8)))
+#define MTK_CHK_PERIOD_MASK (GENMASK(20, 8))
+
+/* Register to clear state of state machine */
+#define MTK_IRCLR_REG 0x20
+/* Bit to restart IR receiving */
+#define MTK_IRCLR BIT(0)
+
+/* Register containing pulse width data */
+#define MTK_CHKDATA_REG(i) (0x88 + 4 * i)
+
+/* Register to enable IR interrupt */
+#define MTK_IRINT_EN_REG 0xcc
+/* Bit to enable interrupt */
+#define MTK_IRINT_EN BIT(0)
+
+/* Register to ack IR interrupt */
+#define MTK_IRINT_CLR_REG 0xd0
+/* Bit to clear interrupt status */
+#define MTK_IRINT_CLR BIT(0)
+
+/* Number of registers to record the pulse width */
+#define MTK_CHKDATA_SZ 17
+/* Required frequency */
+#define MTK_IR_BASE_CLK 273000000
+/* Frequency after IR internal divider */
+#define MTK_IR_CLK (MTK_IR_BASE_CLK / 4)
+/* Sample period in ns */
+#define MTK_IR_SAMPLE (((1000000000ul / MTK_IR_CLK) * CHK_PERIOD))
+/* Indicate the end of IR data*/
+#define MTK_IR_END(v) (v == 0xff)
+
+/* struct mtk_ir - This is the main datasructure for holding the state
+ * of the driver
+ * @dev: The device pointer
+ * @ir_lock: Make sure that synchronization between remove and ISR
+ * @rc: The rc instrance
+ * @base: The mapped register i/o base
+ * @irq: The IRQ that we are using
+ * @clk: The clock that we are using
+ * @map_name: The name for keymap lookup
+ */
+struct mtk_ir {
+ struct device *dev;
+ /*Protect concurrency between driver removal and ISR*/
+ spinlock_t ir_lock;
+ struct rc_dev *rc;
+ void __iomem *base;
+ int irq;
+ struct clk *clk;
+ const char *map_name;
+};
+
+static void mtk_w32_mask(struct mtk_ir *ir, u32 val, u32 mask, unsigned int reg)
+{
+ u32 tmp;
+
+ tmp = __raw_readl(ir->base + reg);
+ tmp = (tmp & ~mask) | val;
+ __raw_writel(tmp, ir->base + reg);
+}
+
+static void mtk_w32(struct mtk_ir *ir, u32 val, unsigned int reg)
+{
+ __raw_writel(val, ir->base + reg);
+}
+
+static u32 mtk_r32(struct mtk_ir *ir, unsigned int reg)
+{
+ return __raw_readl(ir->base + reg);
+}
+
+static inline void mtk_irq_disable(struct mtk_ir *ir, u32 mask)
+{
+ u32 val;
+
+ val = mtk_r32(ir, MTK_IRINT_EN_REG);
+ mtk_w32(ir, val & ~mask, MTK_IRINT_EN_REG);
+}
+
+static inline void mtk_irq_enable(struct mtk_ir *ir, u32 mask)
+{
+ u32 val;
+
+ val = mtk_r32(ir, MTK_IRINT_EN_REG);
+ mtk_w32(ir, val | mask, MTK_IRINT_EN_REG);
+}
+
+static irqreturn_t mtk_ir_irq(int irqno, void *dev_id)
+{
+ struct mtk_ir *ir = dev_id;
+ u8 wid = 0;
+ u32 i, j, val;
+ DEFINE_IR_RAW_EVENT(rawir);
+
+ spin_lock(&ir->ir_lock);
+
+ mtk_irq_disable(ir, MTK_IRINT_EN);
+
+ /* Reset decoder state machine */
+ ir_raw_event_reset(ir->rc);
+
+ /* First message must be pulse */
+ rawir.pulse = false;
+
+ /* Handle pulse and space until end of message */
+ for (i = 0 ; i < MTK_CHKDATA_SZ ; i++) {
+ val = mtk_r32(ir, MTK_CHKDATA_REG(i));
+ dev_dbg(ir->dev, "@reg%d=0x%08x\n", i, val);
+
+ for (j = 0 ; j < 4 ; j++) {
+ wid = (val & (0xff << j * 8)) >> j * 8;
+ rawir.pulse = !rawir.pulse;
+ rawir.duration = wid * (MTK_IR_SAMPLE + 1);
+ ir_raw_event_store_with_filter(ir->rc, &rawir);
+
+ if (MTK_IR_END(wid))
+ goto end_msg;
+ }
+ }
+end_msg:
+ /* Restart the next receive */
+ mtk_w32_mask(ir, 0x1, MTK_IRCLR, MTK_IRCLR_REG);
+
+ ir_raw_event_set_idle(ir->rc, true);
+ ir_raw_event_handle(ir->rc);
+
+ /* Clear interrupt status */
+ mtk_w32_mask(ir, 0x1, MTK_IRINT_CLR, MTK_IRINT_CLR_REG);
+
+ /* Enable interrupt */
+ mtk_irq_enable(ir, MTK_IRINT_EN);
+
+ spin_unlock(&ir->ir_lock);
+
+ return IRQ_HANDLED;
+}
+
+static int mtk_ir_probe(struct platform_device *pdev)
+{
+ struct device *dev = &pdev->dev;
+ struct device_node *dn = dev->of_node;
+ struct resource *res;
+ struct mtk_ir *ir;
+ u32 val;
+ int ret = 0;
+
+ ir = devm_kzalloc(dev, sizeof(struct mtk_ir), GFP_KERNEL);
+ if (!ir)
+ return -ENOMEM;
+
+ spin_lock_init(&ir->ir_lock);
+
+ ir->dev = dev;
+
+ if (!of_device_is_compatible(dn, "mediatek,mt7623-ir"))
+ return -ENODEV;
+
+ ir->clk = devm_clk_get(dev, "clk");
+ if (IS_ERR(ir->clk)) {
+ dev_err(dev, "failed to get a ir clock.\n");
+ return PTR_ERR(ir->clk);
+ }
+
+ if (clk_prepare_enable(ir->clk)) {
+ dev_err(dev, "try to enable ir_clk failed\n");
+ ret = -EINVAL;
+ goto exit_clkdisable_clk;
+ }
+
+ res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+ ir->base = devm_ioremap_resource(dev, res);
+ if (IS_ERR(ir->base)) {
+ dev_err(dev, "failed to map registers\n");
+ ret = PTR_ERR(ir->base);
+ goto exit_clkdisable_clk;
+ }
+
+ ir->rc = rc_allocate_device();
+ if (!ir->rc) {
+ dev_err(dev, "failed to allocate device\n");
+ ret = -ENOMEM;
+ goto exit_clkdisable_clk;
+ }
+
+ ir->rc->priv = ir;
+ ir->rc->input_name = MTK_IR_DEV;
+ ir->rc->input_phys = "mtk-ir/input0";
+ ir->rc->input_id.bustype = BUS_HOST;
+ ir->rc->input_id.vendor = 0x0001;
+ ir->rc->input_id.product = 0x0001;
+ ir->rc->input_id.version = 0x0001;
+ ir->map_name = of_get_property(dn, "linux,rc-map-name", NULL);
+ ir->rc->map_name = ir->map_name ?: RC_MAP_EMPTY;
+ ir->rc->dev.parent = dev;
+ ir->rc->driver_type = RC_DRIVER_IR_RAW;
+ ir->rc->driver_name = MTK_IR_DEV;
+ ir->rc->allowed_protocols = RC_BIT_ALL;
+ ir->rc->rx_resolution = MTK_IR_SAMPLE;
+
+ ret = rc_register_device(ir->rc);
+ if (ret) {
+ dev_err(dev, "failed to register rc device\n");
+ goto exit_free_dev;
+ }
+
+ platform_set_drvdata(pdev, ir);
+
+ ir->irq = platform_get_irq(pdev, 0);
+ if (ir->irq < 0) {
+ dev_err(dev, "no irq resource\n");
+ ret = ir->irq;
+ goto exit_free_dev;
+ }
+
+ ret = devm_request_irq(dev, ir->irq, mtk_ir_irq, 0, MTK_IR_DEV, ir);
+ if (ret) {
+ dev_err(dev, "failed request irq\n");
+ goto exit_free_dev;
+ }
+
+ mtk_irq_disable(ir, MTK_IRINT_EN);
+
+ val = mtk_r32(ir, MTK_CONFIG_HIGH_REG);
+ val |= MTK_PWM_EN | MTK_IR_EN;
+ mtk_w32(ir, val, MTK_CONFIG_HIGH_REG);
+
+ /* Setting sample period */
+ mtk_w32_mask(ir, MTK_CHK_PERIOD, MTK_CHK_PERIOD_MASK,
+ MTK_CONFIG_LOW_REG);
+
+ mtk_irq_enable(ir, MTK_IRINT_EN);
+
+ dev_info(dev, "initialized MT7623 IR driver\n");
+ return 0;
+
+exit_free_dev:
+ rc_free_device(ir->rc);
+exit_clkdisable_clk:
+ clk_disable_unprepare(ir->clk);
+
+ return ret;
+}
+
+static int mtk_ir_remove(struct platform_device *pdev)
+{
+ unsigned long flags;
+
+ struct mtk_ir *ir = platform_get_drvdata(pdev);
+
+ spin_lock_irqsave(&ir->ir_lock, flags);
+
+ mtk_irq_disable(ir, MTK_IRINT_EN);
+
+ clk_disable_unprepare(ir->clk);
+
+ spin_unlock_irqrestore(&ir->ir_lock, flags);
+
+ rc_unregister_device(ir->rc);
+
+ return 0;
+}
+
+static const struct of_device_id mtk_ir_match[] = {
+ { .compatible = "mediatek,mt7623-ir" },
+ {},
+};
+MODULE_DEVICE_TABLE(of, mtk_ir_match);
+
+static struct platform_driver mtk_ir_driver = {
+ .probe = mtk_ir_probe,
+ .remove = mtk_ir_remove,
+ .driver = {
+ .name = MTK_IR_DEV,
+ .of_match_table = mtk_ir_match,
+ },
+};
+
+module_platform_driver(mtk_ir_driver);
+
+MODULE_DESCRIPTION("Mediatek MT7623 IR Receiver Controller Driver");
+MODULE_AUTHOR("Sean Wang <sean.wang@xxxxxxxxxxxx>");
+MODULE_LICENSE("GPL");
--
1.9.1
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