1 // SPDX-License-Identifier: GPL-2.0-only 2 /* 3 * Copyright (c) 2014 Linaro Ltd. 4 * Copyright (c) 2014 Hisilicon Limited. 5 */ 6 7 #include <linux/clk.h> 8 #include <linux/delay.h> 9 #include <linux/interrupt.h> 10 #include <linux/mfd/syscon.h> 11 #include <linux/module.h> 12 #include <linux/of_device.h> 13 #include <linux/regmap.h> 14 #include <media/rc-core.h> 15 16 #define IR_ENABLE 0x00 17 #define IR_CONFIG 0x04 18 #define CNT_LEADS 0x08 19 #define CNT_LEADE 0x0c 20 #define CNT_SLEADE 0x10 21 #define CNT0_B 0x14 22 #define CNT1_B 0x18 23 #define IR_BUSY 0x1c 24 #define IR_DATAH 0x20 25 #define IR_DATAL 0x24 26 #define IR_INTM 0x28 27 #define IR_INTS 0x2c 28 #define IR_INTC 0x30 29 #define IR_START 0x34 30 31 /* interrupt mask */ 32 #define INTMS_SYMBRCV (BIT(24) | BIT(8)) 33 #define INTMS_TIMEOUT (BIT(25) | BIT(9)) 34 #define INTMS_OVERFLOW (BIT(26) | BIT(10)) 35 #define INT_CLR_OVERFLOW BIT(18) 36 #define INT_CLR_TIMEOUT BIT(17) 37 #define INT_CLR_RCV BIT(16) 38 #define INT_CLR_RCVTIMEOUT (BIT(16) | BIT(17)) 39 40 #define IR_CLK_ENABLE BIT(4) 41 #define IR_CLK_RESET BIT(5) 42 43 /* IR_ENABLE register bits */ 44 #define IR_ENABLE_EN BIT(0) 45 #define IR_ENABLE_EN_EXTRA BIT(8) 46 47 #define IR_CFG_WIDTH_MASK 0xffff 48 #define IR_CFG_WIDTH_SHIFT 16 49 #define IR_CFG_FORMAT_MASK 0x3 50 #define IR_CFG_FORMAT_SHIFT 14 51 #define IR_CFG_INT_LEVEL_MASK 0x3f 52 #define IR_CFG_INT_LEVEL_SHIFT 8 53 /* only support raw mode */ 54 #define IR_CFG_MODE_RAW BIT(7) 55 #define IR_CFG_FREQ_MASK 0x7f 56 #define IR_CFG_FREQ_SHIFT 0 57 #define IR_CFG_INT_THRESHOLD 1 58 /* symbol start from low to high, symbol stream end at high*/ 59 #define IR_CFG_SYMBOL_FMT 0 60 #define IR_CFG_SYMBOL_MAXWIDTH 0x3e80 61 62 #define IR_HIX5HD2_NAME "hix5hd2-ir" 63 64 /* Need to set extra bit for enabling IR */ 65 #define HIX5HD2_FLAG_EXTRA_ENABLE BIT(0) 66 67 struct hix5hd2_soc_data { 68 u32 clk_reg; 69 u32 flags; 70 }; 71 72 static const struct hix5hd2_soc_data hix5hd2_data = { 73 .clk_reg = 0x48, 74 }; 75 76 static const struct hix5hd2_soc_data hi3796cv300_data = { 77 .clk_reg = 0x60, 78 .flags = HIX5HD2_FLAG_EXTRA_ENABLE, 79 }; 80 81 struct hix5hd2_ir_priv { 82 int irq; 83 void __iomem *base; 84 struct device *dev; 85 struct rc_dev *rdev; 86 struct regmap *regmap; 87 struct clk *clock; 88 unsigned long rate; 89 const struct hix5hd2_soc_data *socdata; 90 }; 91 92 static int hix5hd2_ir_clk_enable(struct hix5hd2_ir_priv *dev, bool on) 93 { 94 u32 clk_reg = dev->socdata->clk_reg; 95 u32 val; 96 int ret = 0; 97 98 if (dev->regmap) { 99 regmap_read(dev->regmap, clk_reg, &val); 100 if (on) { 101 val &= ~IR_CLK_RESET; 102 val |= IR_CLK_ENABLE; 103 } else { 104 val &= ~IR_CLK_ENABLE; 105 val |= IR_CLK_RESET; 106 } 107 regmap_write(dev->regmap, clk_reg, val); 108 } else { 109 if (on) 110 ret = clk_prepare_enable(dev->clock); 111 else 112 clk_disable_unprepare(dev->clock); 113 } 114 return ret; 115 } 116 117 static inline void hix5hd2_ir_enable(struct hix5hd2_ir_priv *priv) 118 { 119 u32 val = IR_ENABLE_EN; 120 121 if (priv->socdata->flags & HIX5HD2_FLAG_EXTRA_ENABLE) 122 val |= IR_ENABLE_EN_EXTRA; 123 124 writel_relaxed(val, priv->base + IR_ENABLE); 125 } 126 127 static int hix5hd2_ir_config(struct hix5hd2_ir_priv *priv) 128 { 129 int timeout = 10000; 130 u32 val, rate; 131 132 hix5hd2_ir_enable(priv); 133 134 while (readl_relaxed(priv->base + IR_BUSY)) { 135 if (timeout--) { 136 udelay(1); 137 } else { 138 dev_err(priv->dev, "IR_BUSY timeout\n"); 139 return -ETIMEDOUT; 140 } 141 } 142 143 /* Now only support raw mode, with symbol start from low to high */ 144 rate = DIV_ROUND_CLOSEST(priv->rate, 1000000); 145 val = IR_CFG_SYMBOL_MAXWIDTH & IR_CFG_WIDTH_MASK << IR_CFG_WIDTH_SHIFT; 146 val |= IR_CFG_SYMBOL_FMT & IR_CFG_FORMAT_MASK << IR_CFG_FORMAT_SHIFT; 147 val |= (IR_CFG_INT_THRESHOLD - 1) & IR_CFG_INT_LEVEL_MASK 148 << IR_CFG_INT_LEVEL_SHIFT; 149 val |= IR_CFG_MODE_RAW; 150 val |= (rate - 1) & IR_CFG_FREQ_MASK << IR_CFG_FREQ_SHIFT; 151 writel_relaxed(val, priv->base + IR_CONFIG); 152 153 writel_relaxed(0x00, priv->base + IR_INTM); 154 /* write arbitrary value to start */ 155 writel_relaxed(0x01, priv->base + IR_START); 156 return 0; 157 } 158 159 static int hix5hd2_ir_open(struct rc_dev *rdev) 160 { 161 struct hix5hd2_ir_priv *priv = rdev->priv; 162 int ret; 163 164 ret = hix5hd2_ir_clk_enable(priv, true); 165 if (ret) 166 return ret; 167 168 ret = hix5hd2_ir_config(priv); 169 if (ret) { 170 hix5hd2_ir_clk_enable(priv, false); 171 return ret; 172 } 173 return 0; 174 } 175 176 static void hix5hd2_ir_close(struct rc_dev *rdev) 177 { 178 struct hix5hd2_ir_priv *priv = rdev->priv; 179 180 hix5hd2_ir_clk_enable(priv, false); 181 } 182 183 static irqreturn_t hix5hd2_ir_rx_interrupt(int irq, void *data) 184 { 185 u32 symb_num, symb_val, symb_time; 186 u32 data_l, data_h; 187 u32 irq_sr, i; 188 struct hix5hd2_ir_priv *priv = data; 189 190 irq_sr = readl_relaxed(priv->base + IR_INTS); 191 if (irq_sr & INTMS_OVERFLOW) { 192 /* 193 * we must read IR_DATAL first, then we can clean up 194 * IR_INTS availably since logic would not clear 195 * fifo when overflow, drv do the job 196 */ 197 ir_raw_event_reset(priv->rdev); 198 symb_num = readl_relaxed(priv->base + IR_DATAH); 199 for (i = 0; i < symb_num; i++) 200 readl_relaxed(priv->base + IR_DATAL); 201 202 writel_relaxed(INT_CLR_OVERFLOW, priv->base + IR_INTC); 203 dev_info(priv->dev, "overflow, level=%d\n", 204 IR_CFG_INT_THRESHOLD); 205 } 206 207 if ((irq_sr & INTMS_SYMBRCV) || (irq_sr & INTMS_TIMEOUT)) { 208 struct ir_raw_event ev = {}; 209 210 symb_num = readl_relaxed(priv->base + IR_DATAH); 211 for (i = 0; i < symb_num; i++) { 212 symb_val = readl_relaxed(priv->base + IR_DATAL); 213 data_l = ((symb_val & 0xffff) * 10); 214 data_h = ((symb_val >> 16) & 0xffff) * 10; 215 symb_time = (data_l + data_h) / 10; 216 217 ev.duration = data_l; 218 ev.pulse = true; 219 ir_raw_event_store(priv->rdev, &ev); 220 221 if (symb_time < IR_CFG_SYMBOL_MAXWIDTH) { 222 ev.duration = data_h; 223 ev.pulse = false; 224 ir_raw_event_store(priv->rdev, &ev); 225 } else { 226 ir_raw_event_set_idle(priv->rdev, true); 227 } 228 } 229 230 if (irq_sr & INTMS_SYMBRCV) 231 writel_relaxed(INT_CLR_RCV, priv->base + IR_INTC); 232 if (irq_sr & INTMS_TIMEOUT) 233 writel_relaxed(INT_CLR_TIMEOUT, priv->base + IR_INTC); 234 } 235 236 /* Empty software fifo */ 237 ir_raw_event_handle(priv->rdev); 238 return IRQ_HANDLED; 239 } 240 241 static const struct of_device_id hix5hd2_ir_table[] = { 242 { .compatible = "hisilicon,hix5hd2-ir", &hix5hd2_data, }, 243 { .compatible = "hisilicon,hi3796cv300-ir", &hi3796cv300_data, }, 244 {}, 245 }; 246 MODULE_DEVICE_TABLE(of, hix5hd2_ir_table); 247 248 static int hix5hd2_ir_probe(struct platform_device *pdev) 249 { 250 struct rc_dev *rdev; 251 struct device *dev = &pdev->dev; 252 struct resource *res; 253 struct hix5hd2_ir_priv *priv; 254 struct device_node *node = pdev->dev.of_node; 255 const struct of_device_id *of_id; 256 const char *map_name; 257 int ret; 258 259 priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL); 260 if (!priv) 261 return -ENOMEM; 262 263 of_id = of_match_device(hix5hd2_ir_table, dev); 264 if (!of_id) { 265 dev_err(dev, "Unable to initialize IR data\n"); 266 return -ENODEV; 267 } 268 priv->socdata = of_id->data; 269 270 priv->regmap = syscon_regmap_lookup_by_phandle(node, 271 "hisilicon,power-syscon"); 272 if (IS_ERR(priv->regmap)) { 273 dev_info(dev, "no power-reg\n"); 274 priv->regmap = NULL; 275 } 276 277 res = platform_get_resource(pdev, IORESOURCE_MEM, 0); 278 priv->base = devm_ioremap_resource(dev, res); 279 if (IS_ERR(priv->base)) 280 return PTR_ERR(priv->base); 281 282 priv->irq = platform_get_irq(pdev, 0); 283 if (priv->irq < 0) 284 return priv->irq; 285 286 rdev = rc_allocate_device(RC_DRIVER_IR_RAW); 287 if (!rdev) 288 return -ENOMEM; 289 290 priv->clock = devm_clk_get(dev, NULL); 291 if (IS_ERR(priv->clock)) { 292 dev_err(dev, "clock not found\n"); 293 ret = PTR_ERR(priv->clock); 294 goto err; 295 } 296 ret = clk_prepare_enable(priv->clock); 297 if (ret) 298 goto err; 299 priv->rate = clk_get_rate(priv->clock); 300 301 rdev->allowed_protocols = RC_PROTO_BIT_ALL_IR_DECODER; 302 rdev->priv = priv; 303 rdev->open = hix5hd2_ir_open; 304 rdev->close = hix5hd2_ir_close; 305 rdev->driver_name = IR_HIX5HD2_NAME; 306 map_name = of_get_property(node, "linux,rc-map-name", NULL); 307 rdev->map_name = map_name ?: RC_MAP_EMPTY; 308 rdev->device_name = IR_HIX5HD2_NAME; 309 rdev->input_phys = IR_HIX5HD2_NAME "/input0"; 310 rdev->input_id.bustype = BUS_HOST; 311 rdev->input_id.vendor = 0x0001; 312 rdev->input_id.product = 0x0001; 313 rdev->input_id.version = 0x0100; 314 rdev->rx_resolution = 10; 315 rdev->timeout = IR_CFG_SYMBOL_MAXWIDTH * 10; 316 317 ret = rc_register_device(rdev); 318 if (ret < 0) 319 goto clkerr; 320 321 if (devm_request_irq(dev, priv->irq, hix5hd2_ir_rx_interrupt, 322 0, pdev->name, priv) < 0) { 323 dev_err(dev, "IRQ %d register failed\n", priv->irq); 324 ret = -EINVAL; 325 goto regerr; 326 } 327 328 priv->rdev = rdev; 329 priv->dev = dev; 330 platform_set_drvdata(pdev, priv); 331 332 return ret; 333 334 regerr: 335 rc_unregister_device(rdev); 336 rdev = NULL; 337 clkerr: 338 clk_disable_unprepare(priv->clock); 339 err: 340 rc_free_device(rdev); 341 dev_err(dev, "Unable to register device (%d)\n", ret); 342 return ret; 343 } 344 345 static int hix5hd2_ir_remove(struct platform_device *pdev) 346 { 347 struct hix5hd2_ir_priv *priv = platform_get_drvdata(pdev); 348 349 clk_disable_unprepare(priv->clock); 350 rc_unregister_device(priv->rdev); 351 return 0; 352 } 353 354 #ifdef CONFIG_PM_SLEEP 355 static int hix5hd2_ir_suspend(struct device *dev) 356 { 357 struct hix5hd2_ir_priv *priv = dev_get_drvdata(dev); 358 359 clk_disable_unprepare(priv->clock); 360 hix5hd2_ir_clk_enable(priv, false); 361 362 return 0; 363 } 364 365 static int hix5hd2_ir_resume(struct device *dev) 366 { 367 struct hix5hd2_ir_priv *priv = dev_get_drvdata(dev); 368 int ret; 369 370 ret = hix5hd2_ir_clk_enable(priv, true); 371 if (ret) 372 return ret; 373 374 ret = clk_prepare_enable(priv->clock); 375 if (ret) { 376 hix5hd2_ir_clk_enable(priv, false); 377 return ret; 378 } 379 380 hix5hd2_ir_enable(priv); 381 382 writel_relaxed(0x00, priv->base + IR_INTM); 383 writel_relaxed(0xff, priv->base + IR_INTC); 384 writel_relaxed(0x01, priv->base + IR_START); 385 386 return 0; 387 } 388 #endif 389 390 static SIMPLE_DEV_PM_OPS(hix5hd2_ir_pm_ops, hix5hd2_ir_suspend, 391 hix5hd2_ir_resume); 392 393 static struct platform_driver hix5hd2_ir_driver = { 394 .driver = { 395 .name = IR_HIX5HD2_NAME, 396 .of_match_table = hix5hd2_ir_table, 397 .pm = &hix5hd2_ir_pm_ops, 398 }, 399 .probe = hix5hd2_ir_probe, 400 .remove = hix5hd2_ir_remove, 401 }; 402 403 module_platform_driver(hix5hd2_ir_driver); 404 405 MODULE_DESCRIPTION("IR controller driver for hix5hd2 platforms"); 406 MODULE_AUTHOR("Guoxiong Yan <yanguoxiong@huawei.com>"); 407 MODULE_LICENSE("GPL v2"); 408 MODULE_ALIAS("platform:hix5hd2-ir"); 409