Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S934083AbaD3PQ5 (ORCPT ); Wed, 30 Apr 2014 11:16:57 -0400 Received: from mail-lb0-f182.google.com ([209.85.217.182]:34588 "EHLO mail-lb0-f182.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S933969AbaD3PQt (ORCPT ); Wed, 30 Apr 2014 11:16:49 -0400 From: Alexander Bersenev To: linux-sunxi@googlegroups.com, david@hardeman.nu, devicetree@vger.kernel.org, galak@codeaurora.org, grant.likely@linaro.org, ijc+devicetree@hellion.org.uk, james.hogan@imgtec.com, linux-arm-kernel@lists.infradead.org, linux@arm.linux.org.uk, m.chehab@samsung.com, mark.rutland@arm.com, maxime.ripard@free-electrons.com, pawel.moll@arm.com, rdunlap@infradead.org, robh+dt@kernel.org, sean@mess.org, srinivas.kandagatla@st.com, wingrime@linux-sunxi.org, linux-doc@vger.kernel.org, linux-kernel@vger.kernel.org, linux-media@vger.kernel.org Cc: Alexander Bersenev Subject: [PATCH v5 2/3] ARM: sunxi: Add driver for sunxi IR controller Date: Wed, 30 Apr 2014 21:16:49 +0600 Message-Id: <1398871010-30681-3-git-send-email-bay@hackerdom.ru> X-Mailer: git-send-email 1.9.2 In-Reply-To: <1398871010-30681-1-git-send-email-bay@hackerdom.ru> References: <1398871010-30681-1-git-send-email-bay@hackerdom.ru> Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org 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 Signed-off-by: Alexsey Shestacov --- drivers/media/rc/Kconfig | 10 ++ drivers/media/rc/Makefile | 1 + drivers/media/rc/sunxi-ir.c | 303 ++++++++++++++++++++++++++++++++++++++++++++ 3 files changed, 314 insertions(+) create mode 100644 drivers/media/rc/sunxi-ir.c diff --git a/drivers/media/rc/Kconfig b/drivers/media/rc/Kconfig index 8fbd377..9427fad 100644 --- a/drivers/media/rc/Kconfig +++ b/drivers/media/rc/Kconfig @@ -343,4 +343,14 @@ 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 diff --git a/drivers/media/rc/Makefile b/drivers/media/rc/Makefile index f8b54ff..93cdbe9 100644 --- a/drivers/media/rc/Makefile +++ b/drivers/media/rc/Makefile @@ -32,4 +32,5 @@ obj-$(CONFIG_IR_GPIO_CIR) += gpio-ir-recv.o obj-$(CONFIG_IR_IGUANA) += iguanair.o obj-$(CONFIG_IR_TTUSBIR) += ttusbir.o obj-$(CONFIG_RC_ST) += st_rc.o +obj-$(CONFIG_IR_SUNXI) += sunxi-ir.o obj-$(CONFIG_IR_IMG) += img-ir/ diff --git a/drivers/media/rc/sunxi-ir.c b/drivers/media/rc/sunxi-ir.c new file mode 100644 index 0000000..f051d94 --- /dev/null +++ b/drivers/media/rc/sunxi-ir.c @@ -0,0 +1,303 @@ +/* + * Driver for Allwinner sunXi IR controller + * + * Copyright (C) 2014 Alexsey Shestacov + * Copyright (C) 2014 Alexander Bersenev + * + * Based on sun5i-ir.c: + * Copyright (C) 2007-2012 Daniel Wang + * Allwinner Technology Co., Ltd. + * + * 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 +#include +#include +#include +#include + +#define SUNXI_IR_DEV "sunxi-ir" + +/* Registers */ +/* IR Control */ +#define SUNXI_IR_CTL_REG 0x00 +/* Rx Config */ +#define SUNXI_IR_RXCTL_REG 0x10 +/* Rx Data */ +#define SUNXI_IR_RXFIFO_REG 0x20 +/* Rx Interrupt Enable */ +#define SUNXI_IR_RXINT_REG 0x2C +/* Rx Interrupt Status */ +#define SUNXI_IR_RXSTA_REG 0x30 +/* IR Sample Config */ +#define SUNXI_IR_CIR_REG 0x34 + +/* Bit Definition of IR_RXINTS_REG Register */ +#define SUNXI_IR_RXINTS_RXOF BIT(0) /* Rx FIFO Overflow */ +#define SUNXI_IR_RXINTS_RXPE BIT(1) /* Rx Packet End */ +#define SUNXI_IR_RXINTS_RXDA BIT(4) /* Rx FIFO Data Available */ +/* Hardware supported fifo size */ +#define SUNXI_IR_FIFO_SIZE 16 +/* How much messages in fifo triggers IRQ */ +#define SUNXI_IR_FIFO_TRIG 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) +/* Filter threshold in samples */ +#define SUNXI_IR_RXFILT 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_irq(&ir->ir_lock); + + status = readl(ir->base + SUNXI_IR_RXSTA_REG); + + /* clean all pending statuses */ + writel(status | 0xff, ir->base + SUNXI_IR_RXSTA_REG); + + if (status & SUNXI_IR_RXINTS_RXDA) { + /* How much messages in fifo */ + rc = (status >> 8) & 0x3f; + /* 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) * SUNXI_IR_SAMPLE; + ir_raw_event_store_with_filter(ir->rc, &rawir); + } + } + + if (status & SUNXI_IR_RXINTS_RXOF) + ir_raw_event_reset(ir->rc); + else if (status & SUNXI_IR_RXINTS_RXPE) { + ir_raw_event_set_idle(ir->rc, true); + ir_raw_event_handle(ir->rc); + } + + spin_unlock_irq(&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 -EINVAL; + } + ir->clk = devm_clk_get(dev, "ir"); + if (IS_ERR(ir->clk)) { + dev_err(dev, "failed to get a ir clock.\n"); + return -EINVAL; + } + + ret = clk_set_rate(ir->clk, SUNXI_IR_BASE_CLK); + if (ret) { + dev_err(dev, "set ir base clock failed!\n"); + return -EINVAL; + } + + 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 = -ENOMEM; + goto exit_clkdisable_clk; + } + + /* IRQ */ + ir->irq = platform_get_irq(pdev, 0); + if (ir->irq < 0) { + dev_err(dev, "no irq resource\n"); + ret = -EINVAL; + goto exit_clkdisable_clk; + } + + ret = devm_request_irq(dev, ir->irq, sunxi_ir_irq, 0, SUNXI_IR_DEV, ir); + if (ret) { + dev_err(dev, "failed request irq\n"); + ret = -EINVAL; + 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"); + ret = -EINVAL; + goto exit_free_dev; + } + + platform_set_drvdata(pdev, ir); + + /* Enable CIR Mode */ + writel(0x3 << 4, ir->base+SUNXI_IR_CTL_REG); + + /* Config IR Sample Register */ + /* Fsample = clk */ + tmp = 0; + /* Set Filter Threshold */ + tmp |= (SUNXI_IR_RXFILT & 0x3f) << 2; + /* Set Idle Threshold */ + tmp |= (SUNXI_IR_RXIDLE & 0xff) << 8; + writel(tmp, ir->base + SUNXI_IR_CIR_REG); + + /* Invert Input Signal */ + writel(0x1 << 2, ir->base + SUNXI_IR_RXCTL_REG); + + /* Clear All Rx Interrupt Status */ + writel(0xff, ir->base + SUNXI_IR_RXSTA_REG); + + /* Enable IRQ on data, overflow, packed end */ + tmp = (0x1 << 4) | 0x3; + + /* Rx FIFO Threshold */ + tmp |= (SUNXI_IR_FIFO_TRIG - 1) << 8; + + writel(tmp, ir->base + SUNXI_IR_RXINT_REG); + + /* Enable IR Module */ + tmp = readl(ir->base + SUNXI_IR_CTL_REG); + + writel(tmp | 0x3, 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(0xff, 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 "); +MODULE_LICENSE("GPL"); -- 1.9.2 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/