v4.19.13 snapshot.
diff --git a/drivers/media/rc/meson-ir.c b/drivers/media/rc/meson-ir.c
new file mode 100644
index 0000000..f449b35
--- /dev/null
+++ b/drivers/media/rc/meson-ir.c
@@ -0,0 +1,253 @@
+/*
+ * 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;
+ DEFINE_IR_RAW_EVENT(rawir);
+
+ spin_lock(&ir->lock);
+
+ duration = readl_relaxed(ir->reg + IR_DEC_REG1);
+ duration = FIELD_GET(REG1_TIME_IV_MASK, duration);
+ rawir.duration = US_TO_NS(duration * MESON_TRATE);
+
+ status = readl_relaxed(ir->reg + IR_DEC_STATUS);
+ rawir.pulse = !!(status & STATUS_IR_DEC_IN);
+
+ ir_raw_event_store_with_timeout(ir->rc, &rawir);
+
+ 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 irq, 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);
+ }
+
+ irq = platform_get_irq(pdev, 0);
+ if (irq < 0) {
+ dev_err(dev, "no irq resource\n");
+ return irq;
+ }
+
+ ir->rc = devm_rc_allocate_device(dev, RC_DRIVER_IR_RAW);
+ if (!ir->rc) {
+ dev_err(dev, "failed to allocate rc device\n");
+ return -ENOMEM;
+ }
+
+ ir->rc->priv = ir;
+ ir->rc->device_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->allowed_protocols = RC_PROTO_BIT_ALL_IR_DECODER;
+ ir->rc->rx_resolution = US_TO_NS(MESON_TRATE);
+ ir->rc->min_timeout = 1;
+ ir->rc->timeout = IR_DEFAULT_TIMEOUT;
+ ir->rc->max_timeout = 10 * IR_DEFAULT_TIMEOUT;
+ ir->rc->driver_name = DRIVER_NAME;
+
+ spin_lock_init(&ir->lock);
+ platform_set_drvdata(pdev, ir);
+
+ ret = devm_rc_register_device(dev, ir->rc);
+ if (ret) {
+ dev_err(dev, "failed to register rc device\n");
+ return ret;
+ }
+
+ ret = devm_request_irq(dev, irq, meson_ir_irq, 0, NULL, ir);
+ if (ret) {
+ dev_err(dev, "failed to request irq\n");
+ return ret;
+ }
+
+ /* 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 (= raw/software decoding) */
+ if (of_device_is_compatible(node, "amlogic,meson6-ir"))
+ meson_ir_set_mask(ir, IR_DEC_REG1, REG1_MODE_MASK,
+ FIELD_PREP(REG1_MODE_MASK, DECODE_MODE_RAW));
+ else
+ meson_ir_set_mask(ir, IR_DEC_REG2, REG2_MODE_MASK,
+ FIELD_PREP(REG2_MODE_MASK, DECODE_MODE_RAW));
+
+ /* 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,
+ FIELD_PREP(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;
+}
+
+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);
+
+ return 0;
+}
+
+static void meson_ir_shutdown(struct platform_device *pdev)
+{
+ struct device *dev = &pdev->dev;
+ struct device_node *node = dev->of_node;
+ struct meson_ir *ir = platform_get_drvdata(pdev);
+ unsigned long flags;
+
+ spin_lock_irqsave(&ir->lock, flags);
+
+ /*
+ * Set operation mode to NEC/hardware decoding to give
+ * bootloader a chance to power the system back on
+ */
+ if (of_device_is_compatible(node, "amlogic,meson6-ir"))
+ meson_ir_set_mask(ir, IR_DEC_REG1, REG1_MODE_MASK,
+ DECODE_MODE_NEC << REG1_MODE_SHIFT);
+ else
+ meson_ir_set_mask(ir, IR_DEC_REG2, REG2_MODE_MASK,
+ DECODE_MODE_NEC << REG2_MODE_SHIFT);
+
+ /* Set rate to default value */
+ meson_ir_set_mask(ir, IR_DEC_REG0, REG0_RATE_MASK, 0x13);
+
+ spin_unlock_irqrestore(&ir->lock, flags);
+}
+
+static const struct of_device_id meson_ir_match[] = {
+ { .compatible = "amlogic,meson6-ir" },
+ { .compatible = "amlogic,meson8b-ir" },
+ { .compatible = "amlogic,meson-gxbb-ir" },
+ { },
+};
+MODULE_DEVICE_TABLE(of, meson_ir_match);
+
+static struct platform_driver meson_ir_driver = {
+ .probe = meson_ir_probe,
+ .remove = meson_ir_remove,
+ .shutdown = meson_ir_shutdown,
+ .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");