meson-ir.c (6253B)
1// SPDX-License-Identifier: GPL-2.0 2/* 3 * Driver for Amlogic Meson IR remote receiver 4 * 5 * Copyright (C) 2014 Beniamino Galvani <b.galvani@gmail.com> 6 */ 7 8#include <linux/device.h> 9#include <linux/err.h> 10#include <linux/interrupt.h> 11#include <linux/io.h> 12#include <linux/module.h> 13#include <linux/of_platform.h> 14#include <linux/platform_device.h> 15#include <linux/spinlock.h> 16#include <linux/bitfield.h> 17 18#include <media/rc-core.h> 19 20#define DRIVER_NAME "meson-ir" 21 22/* valid on all Meson platforms */ 23#define IR_DEC_LDR_ACTIVE 0x00 24#define IR_DEC_LDR_IDLE 0x04 25#define IR_DEC_LDR_REPEAT 0x08 26#define IR_DEC_BIT_0 0x0c 27#define IR_DEC_REG0 0x10 28#define IR_DEC_FRAME 0x14 29#define IR_DEC_STATUS 0x18 30#define IR_DEC_REG1 0x1c 31/* only available on Meson 8b and newer */ 32#define IR_DEC_REG2 0x20 33 34#define REG0_RATE_MASK GENMASK(11, 0) 35 36#define DECODE_MODE_NEC 0x0 37#define DECODE_MODE_RAW 0x2 38 39/* Meson 6b uses REG1 to configure the mode */ 40#define REG1_MODE_MASK GENMASK(8, 7) 41#define REG1_MODE_SHIFT 7 42 43/* Meson 8b / GXBB use REG2 to configure the mode */ 44#define REG2_MODE_MASK GENMASK(3, 0) 45#define REG2_MODE_SHIFT 0 46 47#define REG1_TIME_IV_MASK GENMASK(28, 16) 48 49#define REG1_IRQSEL_MASK GENMASK(3, 2) 50#define REG1_IRQSEL_NEC_MODE 0 51#define REG1_IRQSEL_RISE_FALL 1 52#define REG1_IRQSEL_FALL 2 53#define REG1_IRQSEL_RISE 3 54 55#define REG1_RESET BIT(0) 56#define REG1_ENABLE BIT(15) 57 58#define STATUS_IR_DEC_IN BIT(8) 59 60#define MESON_TRATE 10 /* us */ 61 62struct meson_ir { 63 void __iomem *reg; 64 struct rc_dev *rc; 65 spinlock_t lock; 66}; 67 68static void meson_ir_set_mask(struct meson_ir *ir, unsigned int reg, 69 u32 mask, u32 value) 70{ 71 u32 data; 72 73 data = readl(ir->reg + reg); 74 data &= ~mask; 75 data |= (value & mask); 76 writel(data, ir->reg + reg); 77} 78 79static irqreturn_t meson_ir_irq(int irqno, void *dev_id) 80{ 81 struct meson_ir *ir = dev_id; 82 u32 duration, status; 83 struct ir_raw_event rawir = {}; 84 85 spin_lock(&ir->lock); 86 87 duration = readl_relaxed(ir->reg + IR_DEC_REG1); 88 duration = FIELD_GET(REG1_TIME_IV_MASK, duration); 89 rawir.duration = duration * MESON_TRATE; 90 91 status = readl_relaxed(ir->reg + IR_DEC_STATUS); 92 rawir.pulse = !!(status & STATUS_IR_DEC_IN); 93 94 ir_raw_event_store_with_timeout(ir->rc, &rawir); 95 96 spin_unlock(&ir->lock); 97 98 return IRQ_HANDLED; 99} 100 101static int meson_ir_probe(struct platform_device *pdev) 102{ 103 struct device *dev = &pdev->dev; 104 struct device_node *node = dev->of_node; 105 const char *map_name; 106 struct meson_ir *ir; 107 int irq, ret; 108 109 ir = devm_kzalloc(dev, sizeof(struct meson_ir), GFP_KERNEL); 110 if (!ir) 111 return -ENOMEM; 112 113 ir->reg = devm_platform_ioremap_resource(pdev, 0); 114 if (IS_ERR(ir->reg)) 115 return PTR_ERR(ir->reg); 116 117 irq = platform_get_irq(pdev, 0); 118 if (irq < 0) 119 return irq; 120 121 ir->rc = devm_rc_allocate_device(dev, RC_DRIVER_IR_RAW); 122 if (!ir->rc) { 123 dev_err(dev, "failed to allocate rc device\n"); 124 return -ENOMEM; 125 } 126 127 ir->rc->priv = ir; 128 ir->rc->device_name = DRIVER_NAME; 129 ir->rc->input_phys = DRIVER_NAME "/input0"; 130 ir->rc->input_id.bustype = BUS_HOST; 131 map_name = of_get_property(node, "linux,rc-map-name", NULL); 132 ir->rc->map_name = map_name ? map_name : RC_MAP_EMPTY; 133 ir->rc->allowed_protocols = RC_PROTO_BIT_ALL_IR_DECODER; 134 ir->rc->rx_resolution = MESON_TRATE; 135 ir->rc->min_timeout = 1; 136 ir->rc->timeout = IR_DEFAULT_TIMEOUT; 137 ir->rc->max_timeout = 10 * IR_DEFAULT_TIMEOUT; 138 ir->rc->driver_name = DRIVER_NAME; 139 140 spin_lock_init(&ir->lock); 141 platform_set_drvdata(pdev, ir); 142 143 ret = devm_rc_register_device(dev, ir->rc); 144 if (ret) { 145 dev_err(dev, "failed to register rc device\n"); 146 return ret; 147 } 148 149 ret = devm_request_irq(dev, irq, meson_ir_irq, 0, NULL, ir); 150 if (ret) { 151 dev_err(dev, "failed to request irq\n"); 152 return ret; 153 } 154 155 /* Reset the decoder */ 156 meson_ir_set_mask(ir, IR_DEC_REG1, REG1_RESET, REG1_RESET); 157 meson_ir_set_mask(ir, IR_DEC_REG1, REG1_RESET, 0); 158 159 /* Set general operation mode (= raw/software decoding) */ 160 if (of_device_is_compatible(node, "amlogic,meson6-ir")) 161 meson_ir_set_mask(ir, IR_DEC_REG1, REG1_MODE_MASK, 162 FIELD_PREP(REG1_MODE_MASK, DECODE_MODE_RAW)); 163 else 164 meson_ir_set_mask(ir, IR_DEC_REG2, REG2_MODE_MASK, 165 FIELD_PREP(REG2_MODE_MASK, DECODE_MODE_RAW)); 166 167 /* Set rate */ 168 meson_ir_set_mask(ir, IR_DEC_REG0, REG0_RATE_MASK, MESON_TRATE - 1); 169 /* IRQ on rising and falling edges */ 170 meson_ir_set_mask(ir, IR_DEC_REG1, REG1_IRQSEL_MASK, 171 FIELD_PREP(REG1_IRQSEL_MASK, REG1_IRQSEL_RISE_FALL)); 172 /* Enable the decoder */ 173 meson_ir_set_mask(ir, IR_DEC_REG1, REG1_ENABLE, REG1_ENABLE); 174 175 dev_info(dev, "receiver initialized\n"); 176 177 return 0; 178} 179 180static int meson_ir_remove(struct platform_device *pdev) 181{ 182 struct meson_ir *ir = platform_get_drvdata(pdev); 183 unsigned long flags; 184 185 /* Disable the decoder */ 186 spin_lock_irqsave(&ir->lock, flags); 187 meson_ir_set_mask(ir, IR_DEC_REG1, REG1_ENABLE, 0); 188 spin_unlock_irqrestore(&ir->lock, flags); 189 190 return 0; 191} 192 193static void meson_ir_shutdown(struct platform_device *pdev) 194{ 195 struct device *dev = &pdev->dev; 196 struct device_node *node = dev->of_node; 197 struct meson_ir *ir = platform_get_drvdata(pdev); 198 unsigned long flags; 199 200 spin_lock_irqsave(&ir->lock, flags); 201 202 /* 203 * Set operation mode to NEC/hardware decoding to give 204 * bootloader a chance to power the system back on 205 */ 206 if (of_device_is_compatible(node, "amlogic,meson6-ir")) 207 meson_ir_set_mask(ir, IR_DEC_REG1, REG1_MODE_MASK, 208 DECODE_MODE_NEC << REG1_MODE_SHIFT); 209 else 210 meson_ir_set_mask(ir, IR_DEC_REG2, REG2_MODE_MASK, 211 DECODE_MODE_NEC << REG2_MODE_SHIFT); 212 213 /* Set rate to default value */ 214 meson_ir_set_mask(ir, IR_DEC_REG0, REG0_RATE_MASK, 0x13); 215 216 spin_unlock_irqrestore(&ir->lock, flags); 217} 218 219static const struct of_device_id meson_ir_match[] = { 220 { .compatible = "amlogic,meson6-ir" }, 221 { .compatible = "amlogic,meson8b-ir" }, 222 { .compatible = "amlogic,meson-gxbb-ir" }, 223 { }, 224}; 225MODULE_DEVICE_TABLE(of, meson_ir_match); 226 227static struct platform_driver meson_ir_driver = { 228 .probe = meson_ir_probe, 229 .remove = meson_ir_remove, 230 .shutdown = meson_ir_shutdown, 231 .driver = { 232 .name = DRIVER_NAME, 233 .of_match_table = meson_ir_match, 234 }, 235}; 236 237module_platform_driver(meson_ir_driver); 238 239MODULE_DESCRIPTION("Amlogic Meson IR remote receiver driver"); 240MODULE_AUTHOR("Beniamino Galvani <b.galvani@gmail.com>"); 241MODULE_LICENSE("GPL v2");