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