drivers/media/rc/ir-hix5hd2.c

   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                              0, 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");