build/patch/kernel/sun8i-default/02-0008-backport-lirc-sunxi-driver.patch
2016-04-13 09:25:21 +02:00

352 lines
9.9 KiB
Diff

diff -Nur a/drivers/media/rc/Kconfig b/drivers/media/rc/Kconfig
--- a/drivers/media/rc/Kconfig 2015-01-27 03:29:27.000000000 +0100
+++ b/drivers/media/rc/Kconfig 2016-02-07 03:25:15.040765088 +0100
@@ -274,5 +274,15 @@
To compile this driver as a module, choose M here: the module will
be called gpio-ir-recv.
+
+config IR_SUNXI
+ tristate "SUNXI IR remote control"
+ depends on RC_CORE && !IR_RX_SUNXI
+ 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-cir.
endif #RC_CORE
diff -Nur a/drivers/media/rc/Makefile b/drivers/media/rc/Makefile
--- a/drivers/media/rc/Makefile 2015-01-27 03:29:27.000000000 +0100
+++ b/drivers/media/rc/Makefile 2016-02-06 23:07:35.000000000 +0100
@@ -27,3 +27,4 @@
obj-$(CONFIG_IR_WINBOND_CIR) += winbond-cir.o
obj-$(CONFIG_RC_LOOPBACK) += rc-loopback.o
obj-$(CONFIG_IR_GPIO_CIR) += gpio-ir-recv.o
+obj-$(CONFIG_IR_SUNXI) += sunxi-cir.o
diff -Nur a/drivers/media/rc/sunxi-cir.c b/drivers/media/rc/sunxi-cir.c
--- a/drivers/media/rc/sunxi-cir.c 1970-01-01 01:00:00.000000000 +0100
+++ b/drivers/media/rc/sunxi-cir.c 2016-02-16 00:19:39.938126949 +0100
@@ -0,0 +1,321 @@
+/*
+ * Driver for Allwinner sunXi IR controller
+ *
+ * Copyright (C) 2014 Alexsey Shestacov <wingrime@linux-sunxi.org>
+ * Copyright (C) 2014 Alexander Bersenev <bay@hackerdom.ru>
+ *
+ * Backported by:
+ * Copyright (C) 2016 Jernej Skrabec <jernej.skrabec@siol.net>
+ *
+ * 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/slab.h>
+#include <media/rc-core.h>
+#include <mach/sunxi-smc.h>
+#include <linux/pinctrl/consumer.h>
+
+#include <linux/clk/clk-sun8iw7.h>
+#define IR0_BASE (void __iomem *)(0xf1f02000)
+
+#define SUNXI_IR_DEV "sunxi-ir"
+
+#ifndef GENMASK
+#define GENMASK(h, l) \
+ (((~0UL) << (l)) & (~0UL >> (BITS_PER_LONG - 1 - (h))))
+#endif
+
+/* 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)
+
+/* Rx Interrupt Status */
+#define SUNXI_IR_RXSTA_REG 0x30
+/* RX FIFO Get Available Counter */
+#define REG_RXSTA_GET_AC(val) (((val) >> 8) & (ir->fifo_size * 2 - 1))
+/* 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)))
+
+/* 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 fifo_size;
+ struct clk *clk;
+ struct clk *apb_clk;
+ struct pinctrl *pinctrl;
+};
+
+static char ir_dev_name[] = "s_cir0";
+
+struct sunxi_ir *ir;
+
+static irqreturn_t sunxi_ir_irq(int irqno, void *dev_id)
+{
+ unsigned long status;
+ unsigned char dt;
+ unsigned int cnt, rc;
+ DEFINE_IR_RAW_EVENT(rawir);
+
+ spin_lock(&ir->ir_lock);
+
+ status = sunxi_smc_readl(ir->base + SUNXI_IR_RXSTA_REG);
+
+ /* clean all pending statuses */
+ sunxi_smc_writel(status | REG_RXSTA_CLEARALL, ir->base + SUNXI_IR_RXSTA_REG);
+
+ if (status & (REG_RXINT_RAI_EN | REG_RXINT_RPEI_EN)) {
+ /* How many messages in fifo */
+ rc = REG_RXSTA_GET_AC(status);
+ /* Sanity check */
+ rc = rc > ir->fifo_size ? ir->fifo_size : rc;
+ /* If we have data */
+ for (cnt = 0; cnt < rc; cnt++) {
+ /* for each bit in fifo */
+ dt = (unsigned char)(sunxi_smc_readl(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 __init ir_rx_init(void)
+{
+ int ret = 0;
+ unsigned long tmp = 0;
+
+ ir = kzalloc(sizeof(struct sunxi_ir), GFP_KERNEL);
+ if (!ir)
+ return -ENOMEM;
+
+ ir->fifo_size = 64;
+
+ spin_lock_init(&ir->ir_lock);
+
+ /* Clock */
+ ir->apb_clk = clk_get(NULL, HOSC_CLK);
+ if (IS_ERR(ir->apb_clk)) {
+ pr_err("failed to get a apb clock.\n");
+ return PTR_ERR(ir->apb_clk);
+ }
+ ir->clk = clk_get(NULL, "cpurcir");
+ if (IS_ERR(ir->clk)) {
+ pr_err("failed to get a ir clock.\n");
+ return PTR_ERR(ir->clk);
+ }
+
+ if(clk_set_parent(ir->clk, ir->apb_clk)) {
+ pr_err("%s: set ir_clk parent to ir_clk_source failed!\n", __func__);
+ }
+
+ ret = clk_set_rate(ir->clk, SUNXI_IR_BASE_CLK);
+ if (ret) {
+ pr_err("set ir base clock failed!\n");
+ goto exit_reset_assert;
+ }
+
+ if (clk_prepare_enable(ir->apb_clk)) {
+ pr_err("try to enable apb_ir_clk failed\n");
+ ret = -EINVAL;
+ goto exit_reset_assert;
+ }
+
+ if (clk_prepare_enable(ir->clk)) {
+ pr_err("try to enable ir_clk failed\n");
+ ret = -EINVAL;
+ goto exit_clkdisable_apb_clk;
+ }
+
+ /* IO */
+ ir->base = IR0_BASE;
+ if (IS_ERR(ir->base)) {
+ pr_err("failed to map registers\n");
+ ret = PTR_ERR(ir->base);
+ goto exit_clkdisable_clk;
+ }
+
+ ir->rc = rc_allocate_device();
+ if (!ir->rc) {
+ pr_err("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/input1";
+ 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->rc->map_name = RC_MAP_EMPTY;
+ ir->rc->driver_type = RC_DRIVER_IR_RAW;
+ ir->rc->allowed_protos = RC_TYPE_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) {
+ pr_err("failed to register rc device\n");
+ goto exit_free_dev;
+ }
+
+ /* pin config */
+ ir->rc->dev.init_name = &ir_dev_name[0];
+ ir->pinctrl = devm_pinctrl_get_select_default(&ir->rc->dev);
+ if (IS_ERR_OR_NULL(ir->pinctrl)) {
+ pr_err("%s: config ir rx pin err.\n", __func__);
+ goto exit_free_dev;
+ }
+
+ ret = request_irq(SUNXI_IRQ_R_CIR_RX, sunxi_ir_irq, 0, SUNXI_IR_DEV, ir);
+ if (ret) {
+ pr_err("failed request irq\n");
+ goto exit_free_pinctrl;
+ }
+
+ /* Enable CIR Mode */
+ sunxi_smc_writel(REG_CTL_MD, ir->base+SUNXI_IR_CTL_REG);
+
+ /* Set noise threshold and idle threshold */
+ sunxi_smc_writel(REG_CIR_NTHR(SUNXI_IR_RXNOISE)|REG_CIR_ITHR(SUNXI_IR_RXIDLE),
+ ir->base + SUNXI_IR_CIR_REG);
+
+ /* Invert Input Signal */
+ sunxi_smc_writel(REG_RXCTL_RPPI, ir->base + SUNXI_IR_RXCTL_REG);
+
+ /* Clear All Rx Interrupt Status */
+ sunxi_smc_writel(REG_RXSTA_CLEARALL, ir->base + SUNXI_IR_RXSTA_REG);
+
+ /*
+ * Enable IRQ on overflow, packet end, FIFO available with trigger
+ * level
+ */
+ sunxi_smc_writel(REG_RXINT_ROI_EN | REG_RXINT_RPEI_EN |
+ REG_RXINT_RAI_EN | REG_RXINT_RAL(ir->fifo_size / 2 - 1),
+ ir->base + SUNXI_IR_RXINT_REG);
+
+ /* Enable IR Module */
+ tmp = sunxi_smc_readl(ir->base + SUNXI_IR_CTL_REG);
+ sunxi_smc_writel(tmp | REG_CTL_GEN | REG_CTL_RXEN, ir->base + SUNXI_IR_CTL_REG);
+
+ return 0;
+
+exit_free_pinctrl:
+ devm_pinctrl_put(ir->pinctrl);
+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);
+exit_reset_assert:
+
+ return ret;
+}
+
+static void __exit ir_rx_exit(void)
+{
+ unsigned long flags;
+
+ clk_disable_unprepare(ir->clk);
+ clk_disable_unprepare(ir->apb_clk);
+
+ spin_lock_irqsave(&ir->ir_lock, flags);
+ /* disable IR IRQ */
+ sunxi_smc_writel(0, ir->base + SUNXI_IR_RXINT_REG);
+ /* clear All Rx Interrupt Status */
+ sunxi_smc_writel(REG_RXSTA_CLEARALL, ir->base + SUNXI_IR_RXSTA_REG);
+ /* disable IR */
+ sunxi_smc_writel(0, ir->base + SUNXI_IR_CTL_REG);
+ spin_unlock_irqrestore(&ir->ir_lock, flags);
+
+ free_irq(SUNXI_IRQ_R_CIR_RX, ir);
+
+ devm_pinctrl_put(ir->pinctrl);
+
+ rc_unregister_device(ir->rc);
+}
+
+
+module_init(ir_rx_init);
+module_exit(ir_rx_exit);
+
+MODULE_DESCRIPTION("Allwinner sunXi IR controller driver");
+MODULE_AUTHOR("Alexsey Shestacov <wingrime@linux-sunxi.org>");
+MODULE_LICENSE("GPL");