4 files changed, 229 insertions, 0 deletions

diff --git a/MAINTAINERS b/MAINTAINERS
index a6288cacde10..f6058ceb297d 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -850,6 +850,7 @@ ARM/Amlogic MesonX SoC support
 M:      Carlo Caione <carlo@caione.org>
 L:      linux-arm-kernel@lists.infradead.org (moderated for non-subscribers)
 S:      Maintained
+F:      drivers/media/rc/meson-ir.c
 N:      meson[x68]
 
 ARM/ATMEL AT91RM9200 AND AT91SAM ARM ARCHITECTURES
diff --git a/drivers/media/rc/Kconfig b/drivers/media/rc/Kconfig
index 1aea7320f52a..ddfab256b9a5 100644
--- a/drivers/media/rc/Kconfig
+++ b/drivers/media/rc/Kconfig
@@ -223,6 +223,17 @@ config IR_FINTEK
            To compile this driver as a module, choose M here: the
            module will be called fintek-cir.
 
+config IR_MESON
+        tristate "Amlogic Meson IR remote receiver"
+        depends on RC_CORE
+        depends on ARCH_MESON || COMPILE_TEST
+        ---help---
+           Say Y if you want to use the IR remote receiver available
+           on Amlogic Meson SoCs.
+
+           To compile this driver as a module, choose M here: the
+           module will be called meson-ir.
+
 config IR_NUVOTON
         tristate "Nuvoton w836x7hg Consumer Infrared Transceiver"
         depends on PNP
diff --git a/drivers/media/rc/Makefile b/drivers/media/rc/Makefile
index 8f509e0d92cf..379a5c0f1379 100644
--- a/drivers/media/rc/Makefile
+++ b/drivers/media/rc/Makefile
@@ -22,6 +22,7 @@ obj-$(CONFIG_IR_IMON) += imon.o
 obj-$(CONFIG_IR_ITE_CIR) += ite-cir.o
 obj-$(CONFIG_IR_MCEUSB) += mceusb.o
 obj-$(CONFIG_IR_FINTEK) += fintek-cir.o
+obj-$(CONFIG_IR_MESON) += meson-ir.o
 obj-$(CONFIG_IR_NUVOTON) += nuvoton-cir.o
 obj-$(CONFIG_IR_ENE) += ene_ir.o
 obj-$(CONFIG_IR_REDRAT3) += redrat3.o
diff --git a/drivers/media/rc/meson-ir.c b/drivers/media/rc/meson-ir.c
new file mode 100644
index 000000000000..fcc3b82d1454
--- /dev/null
+++ b/drivers/media/rc/meson-ir.c
@@ -0,0 +1,216 @@
+/*
+ * 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 <media/rc-core.h>
+
+#define DRIVER_NAME             "meson-ir"
+
+#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
+
+#define REG0_RATE_MASK          (BIT(11) - 1)
+
+#define REG1_MODE_MASK          (BIT(7) | BIT(8))
+#define REG1_MODE_NEC           (0 << 7)
+#define REG1_MODE_GENERAL       (2 << 7)
+
+#define REG1_TIME_IV_SHIFT      16
+#define REG1_TIME_IV_MASK       ((BIT(13) - 1) << REG1_TIME_IV_SHIFT)
+
+#define REG1_IRQSEL_MASK        (BIT(2) | BIT(3))
+#define REG1_IRQSEL_NEC_MODE    (0 << 2)
+#define REG1_IRQSEL_RISE_FALL   (1 << 2)
+#define REG1_IRQSEL_FALL        (2 << 2)
+#define REG1_IRQSEL_RISE        (3 << 2)
+
+#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;
+        int             irq;
+        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;
+        DEFINE_IR_RAW_EVENT(rawir);
+
+        spin_lock(&ir->lock);
+
+        duration = readl(ir->reg + IR_DEC_REG1);
+        duration = (duration & REG1_TIME_IV_MASK) >> REG1_TIME_IV_SHIFT;
+        rawir.duration = US_TO_NS(duration * MESON_TRATE);
+
+        rawir.pulse = !!(readl(ir->reg + IR_DEC_STATUS) & STATUS_IR_DEC_IN);
+
+        ir_raw_event_store_with_filter(ir->rc, &rawir);
+        ir_raw_event_handle(ir->rc);
+
+        spin_unlock(&ir->lock);
+
+        return IRQ_HANDLED;
+}
+
+static int meson_ir_probe(struct platform_device *pdev)
+{
+        struct device *dev = &pdev->dev;
+        struct device_node *node = dev->of_node;
+        struct resource *res;
+        const char *map_name;
+        struct meson_ir *ir;
+        int ret;
+
+        ir = devm_kzalloc(dev, sizeof(struct meson_ir), GFP_KERNEL);
+        if (!ir)
+                return -ENOMEM;
+
+        res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+        ir->reg = devm_ioremap_resource(dev, res);
+        if (IS_ERR(ir->reg)) {
+                dev_err(dev, "failed to map registers\n");
+                return PTR_ERR(ir->reg);
+        }
+
+        ir->irq = platform_get_irq(pdev, 0);
+        if (ir->irq < 0) {
+                dev_err(dev, "no irq resource\n");
+                return ir->irq;
+        }
+
+        ir->rc = rc_allocate_device();
+        if (!ir->rc) {
+                dev_err(dev, "failed to allocate rc device\n");
+                return -ENOMEM;
+        }
+
+        ir->rc->priv = ir;
+        ir->rc->input_name = DRIVER_NAME;
+        ir->rc->input_phys = DRIVER_NAME "/input0";
+        ir->rc->input_id.bustype = BUS_HOST;
+        map_name = of_get_property(node, "linux,rc-map-name", NULL);
+        ir->rc->map_name = map_name ? map_name : RC_MAP_EMPTY;
+        ir->rc->dev.parent = dev;
+        ir->rc->driver_type = RC_DRIVER_IR_RAW;
+        ir->rc->allowed_protocols = RC_BIT_ALL;
+        ir->rc->rx_resolution = US_TO_NS(MESON_TRATE);
+        ir->rc->timeout = MS_TO_NS(200);
+        ir->rc->driver_name = DRIVER_NAME;
+
+        spin_lock_init(&ir->lock);
+        platform_set_drvdata(pdev, ir);
+
+        ret = rc_register_device(ir->rc);
+        if (ret) {
+                dev_err(dev, "failed to register rc device\n");
+                goto out_free;
+        }
+
+        ret = devm_request_irq(dev, ir->irq, meson_ir_irq, 0, "ir-meson", ir);
+        if (ret) {
+                dev_err(dev, "failed to request irq\n");
+                goto out_unreg;
+        }
+
+        /* Reset the decoder */
+        meson_ir_set_mask(ir, IR_DEC_REG1, REG1_RESET, REG1_RESET);
+        meson_ir_set_mask(ir, IR_DEC_REG1, REG1_RESET, 0);
+        /* Set general operation mode */
+        meson_ir_set_mask(ir, IR_DEC_REG1, REG1_MODE_MASK, REG1_MODE_GENERAL);
+        /* Set rate */
+        meson_ir_set_mask(ir, IR_DEC_REG0, REG0_RATE_MASK, MESON_TRATE - 1);
+        /* IRQ on rising and falling edges */
+        meson_ir_set_mask(ir, IR_DEC_REG1, REG1_IRQSEL_MASK,
+                          REG1_IRQSEL_RISE_FALL);
+        /* Enable the decoder */
+        meson_ir_set_mask(ir, IR_DEC_REG1, REG1_ENABLE, REG1_ENABLE);
+
+        dev_info(dev, "receiver initialized\n");
+
+        return 0;
+out_unreg:
+        rc_unregister_device(ir->rc);
+        ir->rc = NULL;
+out_free:
+        rc_free_device(ir->rc);
+
+        return ret;
+}
+
+static int meson_ir_remove(struct platform_device *pdev)
+{
+        struct meson_ir *ir = platform_get_drvdata(pdev);
+        unsigned long flags;
+
+        /* Disable the decoder */
+        spin_lock_irqsave(&ir->lock, flags);
+        meson_ir_set_mask(ir, IR_DEC_REG1, REG1_ENABLE, 0);
+        spin_unlock_irqrestore(&ir->lock, flags);
+
+        rc_unregister_device(ir->rc);
+
+        return 0;
+}
+
+static const struct of_device_id meson_ir_match[] = {
+        { .compatible = "amlogic,meson6-ir" },
+        { },
+};
+
+static struct platform_driver meson_ir_driver = {
+        .probe          = meson_ir_probe,
+        .remove         = meson_ir_remove,
+        .driver = {
+                .name           = DRIVER_NAME,
+                .of_match_table = meson_ir_match,
+        },
+};
+
+module_platform_driver(meson_ir_driver);
+
+MODULE_DESCRIPTION("Amlogic Meson IR remote receiver driver");
+MODULE_AUTHOR("Beniamino Galvani <b.galvani@gmail.com>");
+MODULE_LICENSE("GPL v2");