+++ /dev/null
-From 601b6a88cd14e655ccd246fe122cbf496a891cbb Mon Sep 17 00:00:00 2001
-From: Alexander Bersenev <bay@hackerdom.ru>
-Date: Mon, 9 Jun 2014 00:08:10 +0600
-Subject: [PATCH] rc: add sunxi-ir driver
-
-This patch adds driver for sunxi IR controller.
-It is based on Alexsey Shestacov's work based on the original driver
-supplied by Allwinner.
-
-Signed-off-by: Alexander Bersenev <bay@hackerdom.ru>
-Signed-off-by: Alexsey Shestacov <wingrime@linux-sunxi.org>
----
- drivers/media/rc/Kconfig | 10 ++
- drivers/media/rc/Makefile | 1 +
- drivers/media/rc/sunxi-cir.c | 318 +++++++++++++++++++++++++++++++++++++++++++
- 3 files changed, 329 insertions(+)
- create mode 100644 drivers/media/rc/sunxi-cir.c
-
---- a/drivers/media/rc/Kconfig
-+++ b/drivers/media/rc/Kconfig
-@@ -332,4 +332,14 @@ config RC_ST
-
- If you're not sure, select N here.
-
-+config IR_SUNXI
-+ tristate "SUNXI IR remote control"
-+ depends on RC_CORE
-+ depends on ARCH_SUNXI
-+ ---help---
-+ Say Y if you want to use sunXi internal IR Controller
-+
-+ To compile this driver as a module, choose M here: the module will
-+ be called sunxi-ir.
-+
- endif #RC_DEVICES
---- a/drivers/media/rc/Makefile
-+++ b/drivers/media/rc/Makefile
-@@ -31,3 +31,4 @@ obj-$(CONFIG_IR_GPIO_CIR) += gpio-ir-rec
- obj-$(CONFIG_IR_IGUANA) += iguanair.o
- obj-$(CONFIG_IR_TTUSBIR) += ttusbir.o
- obj-$(CONFIG_RC_ST) += st_rc.o
-+obj-$(CONFIG_IR_SUNXI) += sunxi-cir.o
---- /dev/null
-+++ b/drivers/media/rc/sunxi-cir.c
-@@ -0,0 +1,318 @@
-+/*
-+ * Driver for Allwinner sunXi IR controller
-+ *
-+ * Copyright (C) 2014 Alexsey Shestacov <wingrime@linux-sunxi.org>
-+ * Copyright (C) 2014 Alexander Bersenev <bay@hackerdom.ru>
-+ *
-+ * Based on sun5i-ir.c:
-+ * Copyright (C) 2007-2012 Daniel Wang
-+ * Allwinner Technology Co., Ltd. <www.allwinnertech.com>
-+ *
-+ * 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 <media/rc-core.h>
-+
-+#define SUNXI_IR_DEV "sunxi-ir"
-+
-+/* Registers */
-+/* IR Control */
-+#define SUNXI_IR_CTL_REG 0x00
-+/* Global Enable */
-+#define REG_CTL_GEN BIT(0)
-+/* RX block enable */
-+#define REG_CTL_RXEN BIT(1)
-+/* CIR mode */
-+#define REG_CTL_MD (BIT(4) | BIT(5))
-+
-+/* Rx Config */
-+#define SUNXI_IR_RXCTL_REG 0x10
-+/* Pulse Polarity Invert flag */
-+#define REG_RXCTL_RPPI BIT(2)
-+
-+/* Rx Data */
-+#define SUNXI_IR_RXFIFO_REG 0x20
-+
-+/* Rx Interrupt Enable */
-+#define SUNXI_IR_RXINT_REG 0x2C
-+/* Rx FIFO Overflow */
-+#define REG_RXINT_ROI_EN BIT(0)
-+/* Rx Packet End */
-+#define REG_RXINT_RPEI_EN BIT(1)
-+/* Rx FIFO Data Available */
-+#define REG_RXINT_RAI_EN BIT(4)
-+
-+/* Rx FIFO available byte level */
-+#define REG_RXINT_RAL(val) (((val) << 8) & (GENMASK(11, 8)))
-+
-+/* Rx Interrupt Status */
-+#define SUNXI_IR_RXSTA_REG 0x30
-+/* RX FIFO Get Available Counter */
-+#define REG_RXSTA_GET_AC(val) (((val) >> 8) & (GENMASK(5, 0)))
-+/* Clear all interrupt status value */
-+#define REG_RXSTA_CLEARALL 0xff
-+
-+/* IR Sample Config */
-+#define SUNXI_IR_CIR_REG 0x34
-+/* CIR_REG register noise threshold */
-+#define REG_CIR_NTHR(val) (((val) << 2) & (GENMASK(7, 2)))
-+/* CIR_REG register idle threshold */
-+#define REG_CIR_ITHR(val) (((val) << 8) & (GENMASK(15, 8)))
-+
-+/* Hardware supported fifo size */
-+#define SUNXI_IR_FIFO_SIZE 16
-+/* How many messages in FIFO trigger IRQ */
-+#define TRIGGER_LEVEL 8
-+/* Required frequency for IR0 or IR1 clock in CIR mode */
-+#define SUNXI_IR_BASE_CLK 8000000
-+/* Frequency after IR internal divider */
-+#define SUNXI_IR_CLK (SUNXI_IR_BASE_CLK / 64)
-+/* Sample period in ns */
-+#define SUNXI_IR_SAMPLE (1000000000ul / SUNXI_IR_CLK)
-+/* Noise threshold in samples */
-+#define SUNXI_IR_RXNOISE 1
-+/* Idle Threshold in samples */
-+#define SUNXI_IR_RXIDLE 20
-+/* Time after which device stops sending data in ms */
-+#define SUNXI_IR_TIMEOUT 120
-+
-+struct sunxi_ir {
-+ spinlock_t ir_lock;
-+ struct rc_dev *rc;
-+ void __iomem *base;
-+ int irq;
-+ struct clk *clk;
-+ struct clk *apb_clk;
-+ const char *map_name;
-+};
-+
-+static irqreturn_t sunxi_ir_irq(int irqno, void *dev_id)
-+{
-+ unsigned long status;
-+ unsigned char dt;
-+ unsigned int cnt, rc;
-+ struct sunxi_ir *ir = dev_id;
-+ DEFINE_IR_RAW_EVENT(rawir);
-+
-+ spin_lock(&ir->ir_lock);
-+
-+ status = readl(ir->base + SUNXI_IR_RXSTA_REG);
-+
-+ /* clean all pending statuses */
-+ writel(status | REG_RXSTA_CLEARALL, ir->base + SUNXI_IR_RXSTA_REG);
-+
-+ if (status & REG_RXINT_RAI_EN) {
-+ /* How many messages in fifo */
-+ rc = REG_RXSTA_GET_AC(status);
-+ /* Sanity check */
-+ rc = rc > SUNXI_IR_FIFO_SIZE ? SUNXI_IR_FIFO_SIZE : rc;
-+ /* If we have data */
-+ for (cnt = 0; cnt < rc; cnt++) {
-+ /* for each bit in fifo */
-+ dt = readb(ir->base + SUNXI_IR_RXFIFO_REG);
-+ rawir.pulse = (dt & 0x80) != 0;
-+ rawir.duration = ((dt & 0x7f) + 1) * SUNXI_IR_SAMPLE;
-+ ir_raw_event_store_with_filter(ir->rc, &rawir);
-+ }
-+ }
-+
-+ if (status & REG_RXINT_ROI_EN) {
-+ ir_raw_event_reset(ir->rc);
-+ } else if (status & REG_RXINT_RPEI_EN) {
-+ ir_raw_event_set_idle(ir->rc, true);
-+ ir_raw_event_handle(ir->rc);
-+ }
-+
-+ spin_unlock(&ir->ir_lock);
-+
-+ return IRQ_HANDLED;
-+}
-+
-+static int sunxi_ir_probe(struct platform_device *pdev)
-+{
-+ int ret = 0;
-+ unsigned long tmp = 0;
-+
-+ struct device *dev = &pdev->dev;
-+ struct device_node *dn = dev->of_node;
-+ struct resource *res;
-+ struct sunxi_ir *ir;
-+
-+ ir = devm_kzalloc(dev, sizeof(struct sunxi_ir), GFP_KERNEL);
-+ if (!ir)
-+ return -ENOMEM;
-+
-+ /* Clock */
-+ ir->apb_clk = devm_clk_get(dev, "apb");
-+ if (IS_ERR(ir->apb_clk)) {
-+ dev_err(dev, "failed to get a apb clock.\n");
-+ return PTR_ERR(ir->apb_clk);
-+ }
-+ ir->clk = devm_clk_get(dev, "ir");
-+ if (IS_ERR(ir->clk)) {
-+ dev_err(dev, "failed to get a ir clock.\n");
-+ return PTR_ERR(ir->clk);
-+ }
-+
-+ ret = clk_set_rate(ir->clk, SUNXI_IR_BASE_CLK);
-+ if (ret) {
-+ dev_err(dev, "set ir base clock failed!\n");
-+ return ret;
-+ }
-+
-+ if (clk_prepare_enable(ir->apb_clk)) {
-+ dev_err(dev, "try to enable apb_ir_clk failed\n");
-+ return -EINVAL;
-+ }
-+
-+ if (clk_prepare_enable(ir->clk)) {
-+ dev_err(dev, "try to enable ir_clk failed\n");
-+ ret = -EINVAL;
-+ goto exit_clkdisable_apb_clk;
-+ }
-+
-+ /* IO */
-+ 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 = SUNXI_IR_DEV;
-+ ir->rc->input_phys = "sunxi-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 = 0x0100;
-+ 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;
-+ rc_set_allowed_protocols(ir->rc, RC_BIT_ALL);
-+ ir->rc->rx_resolution = SUNXI_IR_SAMPLE;
-+ ir->rc->timeout = MS_TO_NS(SUNXI_IR_TIMEOUT);
-+ ir->rc->driver_name = SUNXI_IR_DEV;
-+
-+ 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);
-+
-+ /* IRQ */
-+ 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, sunxi_ir_irq, 0, SUNXI_IR_DEV, ir);
-+ if (ret) {
-+ dev_err(dev, "failed request irq\n");
-+ goto exit_free_dev;
-+ }
-+
-+ /* Enable CIR Mode */
-+ writel(REG_CTL_MD, ir->base+SUNXI_IR_CTL_REG);
-+
-+ /* Set noise threshold and idle threshold */
-+ writel(REG_CIR_NTHR(SUNXI_IR_RXNOISE)|REG_CIR_ITHR(SUNXI_IR_RXIDLE),
-+ ir->base + SUNXI_IR_CIR_REG);
-+
-+ /* Invert Input Signal */
-+ writel(REG_RXCTL_RPPI, ir->base + SUNXI_IR_RXCTL_REG);
-+
-+ /* Clear All Rx Interrupt Status */
-+ writel(REG_RXSTA_CLEARALL, ir->base + SUNXI_IR_RXSTA_REG);
-+
-+ /*
-+ * Enable IRQ on overflow, packet end, FIFO available with trigger
-+ * level
-+ */
-+ writel(REG_RXINT_ROI_EN | REG_RXINT_RPEI_EN |
-+ REG_RXINT_RAI_EN | REG_RXINT_RAL(TRIGGER_LEVEL - 1),
-+ ir->base + SUNXI_IR_RXINT_REG);
-+
-+ /* Enable IR Module */
-+ tmp = readl(ir->base + SUNXI_IR_CTL_REG);
-+ writel(tmp | REG_CTL_GEN | REG_CTL_RXEN, ir->base + SUNXI_IR_CTL_REG);
-+
-+ dev_info(dev, "initialized sunXi IR driver\n");
-+ return 0;
-+
-+exit_free_dev:
-+ rc_free_device(ir->rc);
-+exit_clkdisable_clk:
-+ clk_disable_unprepare(ir->clk);
-+exit_clkdisable_apb_clk:
-+ clk_disable_unprepare(ir->apb_clk);
-+
-+ return ret;
-+}
-+
-+static int sunxi_ir_remove(struct platform_device *pdev)
-+{
-+ unsigned long flags;
-+ struct sunxi_ir *ir = platform_get_drvdata(pdev);
-+
-+ clk_disable_unprepare(ir->clk);
-+ clk_disable_unprepare(ir->apb_clk);
-+
-+ spin_lock_irqsave(&ir->ir_lock, flags);
-+ /* disable IR IRQ */
-+ writel(0, ir->base + SUNXI_IR_RXINT_REG);
-+ /* clear All Rx Interrupt Status */
-+ writel(REG_RXSTA_CLEARALL, ir->base + SUNXI_IR_RXSTA_REG);
-+ /* disable IR */
-+ writel(0, ir->base + SUNXI_IR_CTL_REG);
-+ spin_unlock_irqrestore(&ir->ir_lock, flags);
-+
-+ rc_unregister_device(ir->rc);
-+ return 0;
-+}
-+
-+static const struct of_device_id sunxi_ir_match[] = {
-+ { .compatible = "allwinner,sun7i-a20-ir", },
-+ {},
-+};
-+
-+static struct platform_driver sunxi_ir_driver = {
-+ .probe = sunxi_ir_probe,
-+ .remove = sunxi_ir_remove,
-+ .driver = {
-+ .name = SUNXI_IR_DEV,
-+ .owner = THIS_MODULE,
-+ .of_match_table = sunxi_ir_match,
-+ },
-+};
-+
-+module_platform_driver(sunxi_ir_driver);
-+
-+MODULE_DESCRIPTION("Allwinner sunXi IR controller driver");
-+MODULE_AUTHOR("Alexsey Shestacov <wingrime@linux-sunxi.org>");
-+MODULE_LICENSE("GPL");
projects / openwrt.git / blobdiff