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 void hix5hd2_ir_enable(struct hix5hd2_ir_priv *dev, bool on) 75 { 76 u32 val; 77 78 regmap_read(dev->regmap, IR_CLK, &val); 79 if (on) { 80 val &= ~IR_CLK_RESET; 81 val |= IR_CLK_ENABLE; 82 } else { 83 val &= ~IR_CLK_ENABLE; 84 val |= IR_CLK_RESET; 85 } 86 regmap_write(dev->regmap, IR_CLK, val); 87 } 88 89 static int hix5hd2_ir_config(struct hix5hd2_ir_priv *priv) 90 { 91 int timeout = 10000; 92 u32 val, rate; 93 94 writel_relaxed(0x01, priv->base + IR_ENABLE); 95 while (readl_relaxed(priv->base + IR_BUSY)) { 96 if (timeout--) { 97 udelay(1); 98 } else { 99 dev_err(priv->dev, "IR_BUSY timeout\n"); 100 return -ETIMEDOUT; 101 } 102 } 103 104 /* Now only support raw mode, with symbol start from low to high */ 105 rate = DIV_ROUND_CLOSEST(priv->rate, 1000000); 106 val = IR_CFG_SYMBOL_MAXWIDTH & IR_CFG_WIDTH_MASK << IR_CFG_WIDTH_SHIFT; 107 val |= IR_CFG_SYMBOL_FMT & IR_CFG_FORMAT_MASK << IR_CFG_FORMAT_SHIFT; 108 val |= (IR_CFG_INT_THRESHOLD - 1) & IR_CFG_INT_LEVEL_MASK 109 << IR_CFG_INT_LEVEL_SHIFT; 110 val |= IR_CFG_MODE_RAW; 111 val |= (rate - 1) & IR_CFG_FREQ_MASK << IR_CFG_FREQ_SHIFT; 112 writel_relaxed(val, priv->base + IR_CONFIG); 113 114 writel_relaxed(0x00, priv->base + IR_INTM); 115 /* write arbitrary value to start */ 116 writel_relaxed(0x01, priv->base + IR_START); 117 return 0; 118 } 119 120 static int hix5hd2_ir_open(struct rc_dev *rdev) 121 { 122 struct hix5hd2_ir_priv *priv = rdev->priv; 123 124 hix5hd2_ir_enable(priv, true); 125 return hix5hd2_ir_config(priv); 126 } 127 128 static void hix5hd2_ir_close(struct rc_dev *rdev) 129 { 130 struct hix5hd2_ir_priv *priv = rdev->priv; 131 132 hix5hd2_ir_enable(priv, false); 133 } 134 135 static irqreturn_t hix5hd2_ir_rx_interrupt(int irq, void *data) 136 { 137 u32 symb_num, symb_val, symb_time; 138 u32 data_l, data_h; 139 u32 irq_sr, i; 140 struct hix5hd2_ir_priv *priv = data; 141 142 irq_sr = readl_relaxed(priv->base + IR_INTS); 143 if (irq_sr & INTMS_OVERFLOW) { 144 /* 145 * we must read IR_DATAL first, then we can clean up 146 * IR_INTS availably since logic would not clear 147 * fifo when overflow, drv do the job 148 */ 149 ir_raw_event_reset(priv->rdev); 150 symb_num = readl_relaxed(priv->base + IR_DATAH); 151 for (i = 0; i < symb_num; i++) 152 readl_relaxed(priv->base + IR_DATAL); 153 154 writel_relaxed(INT_CLR_OVERFLOW, priv->base + IR_INTC); 155 dev_info(priv->dev, "overflow, level=%d\n", 156 IR_CFG_INT_THRESHOLD); 157 } 158 159 if ((irq_sr & INTMS_SYMBRCV) || (irq_sr & INTMS_TIMEOUT)) { 160 DEFINE_IR_RAW_EVENT(ev); 161 162 symb_num = readl_relaxed(priv->base + IR_DATAH); 163 for (i = 0; i < symb_num; i++) { 164 symb_val = readl_relaxed(priv->base + IR_DATAL); 165 data_l = ((symb_val & 0xffff) * 10); 166 data_h = ((symb_val >> 16) & 0xffff) * 10; 167 symb_time = (data_l + data_h) / 10; 168 169 ev.duration = US_TO_NS(data_l); 170 ev.pulse = true; 171 ir_raw_event_store(priv->rdev, &ev); 172 173 if (symb_time < IR_CFG_SYMBOL_MAXWIDTH) { 174 ev.duration = US_TO_NS(data_h); 175 ev.pulse = false; 176 ir_raw_event_store(priv->rdev, &ev); 177 } else { 178 ir_raw_event_set_idle(priv->rdev, true); 179 } 180 } 181 182 if (irq_sr & INTMS_SYMBRCV) 183 writel_relaxed(INT_CLR_RCV, priv->base + IR_INTC); 184 if (irq_sr & INTMS_TIMEOUT) 185 writel_relaxed(INT_CLR_TIMEOUT, priv->base + IR_INTC); 186 } 187 188 /* Empty software fifo */ 189 ir_raw_event_handle(priv->rdev); 190 return IRQ_HANDLED; 191 } 192 193 static int hix5hd2_ir_probe(struct platform_device *pdev) 194 { 195 struct rc_dev *rdev; 196 struct device *dev = &pdev->dev; 197 struct resource *res; 198 struct hix5hd2_ir_priv *priv; 199 struct device_node *node = pdev->dev.of_node; 200 const char *map_name; 201 int ret; 202 203 priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL); 204 if (!priv) 205 return -ENOMEM; 206 207 priv->regmap = syscon_regmap_lookup_by_phandle(node, 208 "hisilicon,power-syscon"); 209 if (IS_ERR(priv->regmap)) { 210 dev_err(dev, "no power-reg\n"); 211 return -EINVAL; 212 } 213 214 res = platform_get_resource(pdev, IORESOURCE_MEM, 0); 215 priv->base = devm_ioremap_resource(dev, res); 216 if (IS_ERR(priv->base)) 217 return PTR_ERR(priv->base); 218 219 priv->irq = platform_get_irq(pdev, 0); 220 if (priv->irq < 0) { 221 dev_err(dev, "irq can not get\n"); 222 return priv->irq; 223 } 224 225 rdev = rc_allocate_device(); 226 if (!rdev) 227 return -ENOMEM; 228 229 priv->clock = devm_clk_get(dev, NULL); 230 if (IS_ERR(priv->clock)) { 231 dev_err(dev, "clock not found\n"); 232 ret = PTR_ERR(priv->clock); 233 goto err; 234 } 235 clk_prepare_enable(priv->clock); 236 priv->rate = clk_get_rate(priv->clock); 237 238 rdev->driver_type = RC_DRIVER_IR_RAW; 239 rdev->allowed_protocols = RC_BIT_ALL; 240 rdev->priv = priv; 241 rdev->open = hix5hd2_ir_open; 242 rdev->close = hix5hd2_ir_close; 243 rdev->driver_name = IR_HIX5HD2_NAME; 244 map_name = of_get_property(node, "linux,rc-map-name", NULL); 245 rdev->map_name = map_name ?: RC_MAP_EMPTY; 246 rdev->input_name = IR_HIX5HD2_NAME; 247 rdev->input_phys = IR_HIX5HD2_NAME "/input0"; 248 rdev->input_id.bustype = BUS_HOST; 249 rdev->input_id.vendor = 0x0001; 250 rdev->input_id.product = 0x0001; 251 rdev->input_id.version = 0x0100; 252 rdev->rx_resolution = US_TO_NS(10); 253 rdev->timeout = US_TO_NS(IR_CFG_SYMBOL_MAXWIDTH * 10); 254 255 ret = rc_register_device(rdev); 256 if (ret < 0) 257 goto clkerr; 258 259 if (devm_request_irq(dev, priv->irq, hix5hd2_ir_rx_interrupt, 260 IRQF_NO_SUSPEND, pdev->name, priv) < 0) { 261 dev_err(dev, "IRQ %d register failed\n", priv->irq); 262 ret = -EINVAL; 263 goto regerr; 264 } 265 266 priv->rdev = rdev; 267 priv->dev = dev; 268 platform_set_drvdata(pdev, priv); 269 270 return ret; 271 272 regerr: 273 rc_unregister_device(rdev); 274 rdev = NULL; 275 clkerr: 276 clk_disable_unprepare(priv->clock); 277 err: 278 rc_free_device(rdev); 279 dev_err(dev, "Unable to register device (%d)\n", ret); 280 return ret; 281 } 282 283 static int hix5hd2_ir_remove(struct platform_device *pdev) 284 { 285 struct hix5hd2_ir_priv *priv = platform_get_drvdata(pdev); 286 287 clk_disable_unprepare(priv->clock); 288 rc_unregister_device(priv->rdev); 289 return 0; 290 } 291 292 #ifdef CONFIG_PM_SLEEP 293 static int hix5hd2_ir_suspend(struct device *dev) 294 { 295 struct hix5hd2_ir_priv *priv = dev_get_drvdata(dev); 296 297 clk_disable_unprepare(priv->clock); 298 hix5hd2_ir_enable(priv, false); 299 300 return 0; 301 } 302 303 static int hix5hd2_ir_resume(struct device *dev) 304 { 305 struct hix5hd2_ir_priv *priv = dev_get_drvdata(dev); 306 307 hix5hd2_ir_enable(priv, true); 308 clk_prepare_enable(priv->clock); 309 310 writel_relaxed(0x01, priv->base + IR_ENABLE); 311 writel_relaxed(0x00, priv->base + IR_INTM); 312 writel_relaxed(0xff, priv->base + IR_INTC); 313 writel_relaxed(0x01, priv->base + IR_START); 314 315 return 0; 316 } 317 #endif 318 319 static SIMPLE_DEV_PM_OPS(hix5hd2_ir_pm_ops, hix5hd2_ir_suspend, 320 hix5hd2_ir_resume); 321 322 static const struct of_device_id hix5hd2_ir_table[] = { 323 { .compatible = "hisilicon,hix5hd2-ir", }, 324 {}, 325 }; 326 MODULE_DEVICE_TABLE(of, hix5hd2_ir_table); 327 328 static struct platform_driver hix5hd2_ir_driver = { 329 .driver = { 330 .name = IR_HIX5HD2_NAME, 331 .of_match_table = hix5hd2_ir_table, 332 .pm = &hix5hd2_ir_pm_ops, 333 }, 334 .probe = hix5hd2_ir_probe, 335 .remove = hix5hd2_ir_remove, 336 }; 337 338 module_platform_driver(hix5hd2_ir_driver); 339 340 MODULE_DESCRIPTION("IR controller driver for hix5hd2 platforms"); 341 MODULE_AUTHOR("Guoxiong Yan <yanguoxiong@huawei.com>"); 342 MODULE_LICENSE("GPL v2"); 343 MODULE_ALIAS("platform:hix5hd2-ir"); 344