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2aa1bd1c1c
On the Amlogic SoCs, the bootloader firmware can handle the IR hardware in order to Wake up or Power back the system when in suspend on shutdown mode. This patch switches the hardware configuration in a state usable by the firmware to permit powering the system back. Some vendor bootloader firmware were modified to switch to this configuration but it may not be the case for all available products. This patch was originally posted at [1]. [1] https://github.com/LibreELEC/linux-amlogic/pull/27 Signed-off-by: Alex Deryskyba <alex@codesnake.com> Signed-off-by: Neil Armstrong <narmstrong@baylibre.com> Signed-off-by: Sean Young <sean@mess.org> Signed-off-by: Mauro Carvalho Chehab <mchehab@s-opensource.com>
253 lines
6.5 KiB
C
253 lines
6.5 KiB
C
/*
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* Driver for Amlogic Meson IR remote receiver
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*
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* Copyright (C) 2014 Beniamino Galvani <b.galvani@gmail.com>
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* version 2 as published by the Free Software Foundation.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include <linux/device.h>
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#include <linux/err.h>
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#include <linux/interrupt.h>
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#include <linux/io.h>
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#include <linux/module.h>
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#include <linux/of_platform.h>
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#include <linux/platform_device.h>
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#include <linux/spinlock.h>
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#include <linux/bitfield.h>
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#include <media/rc-core.h>
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#define DRIVER_NAME "meson-ir"
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/* valid on all Meson platforms */
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#define IR_DEC_LDR_ACTIVE 0x00
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#define IR_DEC_LDR_IDLE 0x04
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#define IR_DEC_LDR_REPEAT 0x08
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#define IR_DEC_BIT_0 0x0c
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#define IR_DEC_REG0 0x10
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#define IR_DEC_FRAME 0x14
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#define IR_DEC_STATUS 0x18
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#define IR_DEC_REG1 0x1c
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/* only available on Meson 8b and newer */
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#define IR_DEC_REG2 0x20
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#define REG0_RATE_MASK GENMASK(11, 0)
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#define DECODE_MODE_NEC 0x0
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#define DECODE_MODE_RAW 0x2
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/* Meson 6b uses REG1 to configure the mode */
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#define REG1_MODE_MASK GENMASK(8, 7)
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#define REG1_MODE_SHIFT 7
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/* Meson 8b / GXBB use REG2 to configure the mode */
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#define REG2_MODE_MASK GENMASK(3, 0)
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#define REG2_MODE_SHIFT 0
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#define REG1_TIME_IV_MASK GENMASK(28, 16)
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#define REG1_IRQSEL_MASK GENMASK(3, 2)
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#define REG1_IRQSEL_NEC_MODE 0
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#define REG1_IRQSEL_RISE_FALL 1
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#define REG1_IRQSEL_FALL 2
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#define REG1_IRQSEL_RISE 3
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#define REG1_RESET BIT(0)
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#define REG1_ENABLE BIT(15)
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#define STATUS_IR_DEC_IN BIT(8)
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#define MESON_TRATE 10 /* us */
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struct meson_ir {
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void __iomem *reg;
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struct rc_dev *rc;
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spinlock_t lock;
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};
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static void meson_ir_set_mask(struct meson_ir *ir, unsigned int reg,
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u32 mask, u32 value)
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{
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u32 data;
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data = readl(ir->reg + reg);
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data &= ~mask;
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data |= (value & mask);
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writel(data, ir->reg + reg);
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}
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static irqreturn_t meson_ir_irq(int irqno, void *dev_id)
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{
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struct meson_ir *ir = dev_id;
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u32 duration, status;
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DEFINE_IR_RAW_EVENT(rawir);
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spin_lock(&ir->lock);
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duration = readl_relaxed(ir->reg + IR_DEC_REG1);
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duration = FIELD_GET(REG1_TIME_IV_MASK, duration);
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rawir.duration = US_TO_NS(duration * MESON_TRATE);
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status = readl_relaxed(ir->reg + IR_DEC_STATUS);
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rawir.pulse = !!(status & STATUS_IR_DEC_IN);
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ir_raw_event_store(ir->rc, &rawir);
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ir_raw_event_handle(ir->rc);
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spin_unlock(&ir->lock);
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return IRQ_HANDLED;
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}
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static int meson_ir_probe(struct platform_device *pdev)
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{
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struct device *dev = &pdev->dev;
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struct device_node *node = dev->of_node;
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struct resource *res;
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const char *map_name;
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struct meson_ir *ir;
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int irq, ret;
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ir = devm_kzalloc(dev, sizeof(struct meson_ir), GFP_KERNEL);
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if (!ir)
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return -ENOMEM;
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res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
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ir->reg = devm_ioremap_resource(dev, res);
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if (IS_ERR(ir->reg)) {
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dev_err(dev, "failed to map registers\n");
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return PTR_ERR(ir->reg);
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}
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irq = platform_get_irq(pdev, 0);
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if (irq < 0) {
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dev_err(dev, "no irq resource\n");
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return irq;
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}
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ir->rc = devm_rc_allocate_device(dev, RC_DRIVER_IR_RAW);
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if (!ir->rc) {
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dev_err(dev, "failed to allocate rc device\n");
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return -ENOMEM;
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}
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ir->rc->priv = ir;
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ir->rc->input_name = DRIVER_NAME;
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ir->rc->input_phys = DRIVER_NAME "/input0";
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ir->rc->input_id.bustype = BUS_HOST;
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map_name = of_get_property(node, "linux,rc-map-name", NULL);
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ir->rc->map_name = map_name ? map_name : RC_MAP_EMPTY;
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ir->rc->allowed_protocols = RC_BIT_ALL_IR_DECODER;
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ir->rc->rx_resolution = US_TO_NS(MESON_TRATE);
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ir->rc->timeout = MS_TO_NS(200);
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ir->rc->driver_name = DRIVER_NAME;
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spin_lock_init(&ir->lock);
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platform_set_drvdata(pdev, ir);
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ret = devm_rc_register_device(dev, ir->rc);
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if (ret) {
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dev_err(dev, "failed to register rc device\n");
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return ret;
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}
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ret = devm_request_irq(dev, irq, meson_ir_irq, 0, NULL, ir);
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if (ret) {
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dev_err(dev, "failed to request irq\n");
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return ret;
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}
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/* Reset the decoder */
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meson_ir_set_mask(ir, IR_DEC_REG1, REG1_RESET, REG1_RESET);
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meson_ir_set_mask(ir, IR_DEC_REG1, REG1_RESET, 0);
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/* Set general operation mode (= raw/software decoding) */
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if (of_device_is_compatible(node, "amlogic,meson6-ir"))
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meson_ir_set_mask(ir, IR_DEC_REG1, REG1_MODE_MASK,
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FIELD_PREP(REG1_MODE_MASK, DECODE_MODE_RAW));
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else
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meson_ir_set_mask(ir, IR_DEC_REG2, REG2_MODE_MASK,
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FIELD_PREP(REG2_MODE_MASK, DECODE_MODE_RAW));
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/* Set rate */
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meson_ir_set_mask(ir, IR_DEC_REG0, REG0_RATE_MASK, MESON_TRATE - 1);
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/* IRQ on rising and falling edges */
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meson_ir_set_mask(ir, IR_DEC_REG1, REG1_IRQSEL_MASK,
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FIELD_PREP(REG1_IRQSEL_MASK, REG1_IRQSEL_RISE_FALL));
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/* Enable the decoder */
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meson_ir_set_mask(ir, IR_DEC_REG1, REG1_ENABLE, REG1_ENABLE);
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dev_info(dev, "receiver initialized\n");
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return 0;
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}
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static int meson_ir_remove(struct platform_device *pdev)
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{
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struct meson_ir *ir = platform_get_drvdata(pdev);
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unsigned long flags;
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/* Disable the decoder */
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spin_lock_irqsave(&ir->lock, flags);
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meson_ir_set_mask(ir, IR_DEC_REG1, REG1_ENABLE, 0);
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spin_unlock_irqrestore(&ir->lock, flags);
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return 0;
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}
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static void meson_ir_shutdown(struct platform_device *pdev)
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{
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struct device *dev = &pdev->dev;
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struct device_node *node = dev->of_node;
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struct meson_ir *ir = platform_get_drvdata(pdev);
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unsigned long flags;
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spin_lock_irqsave(&ir->lock, flags);
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/*
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* Set operation mode to NEC/hardware decoding to give
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* bootloader a chance to power the system back on
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*/
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if (of_device_is_compatible(node, "amlogic,meson6-ir"))
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meson_ir_set_mask(ir, IR_DEC_REG1, REG1_MODE_MASK,
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DECODE_MODE_NEC << REG1_MODE_SHIFT);
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else
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meson_ir_set_mask(ir, IR_DEC_REG2, REG2_MODE_MASK,
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DECODE_MODE_NEC << REG2_MODE_SHIFT);
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/* Set rate to default value */
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meson_ir_set_mask(ir, IR_DEC_REG0, REG0_RATE_MASK, 0x13);
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spin_unlock_irqrestore(&ir->lock, flags);
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}
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static const struct of_device_id meson_ir_match[] = {
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{ .compatible = "amlogic,meson6-ir" },
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{ .compatible = "amlogic,meson8b-ir" },
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{ .compatible = "amlogic,meson-gxbb-ir" },
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{ },
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};
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MODULE_DEVICE_TABLE(of, meson_ir_match);
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static struct platform_driver meson_ir_driver = {
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.probe = meson_ir_probe,
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.remove = meson_ir_remove,
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.shutdown = meson_ir_shutdown,
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.driver = {
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.name = DRIVER_NAME,
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.of_match_table = meson_ir_match,
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},
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};
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module_platform_driver(meson_ir_driver);
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MODULE_DESCRIPTION("Amlogic Meson IR remote receiver driver");
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MODULE_AUTHOR("Beniamino Galvani <b.galvani@gmail.com>");
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MODULE_LICENSE("GPL v2");
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