LXR linux/drivers/gpu/drm/nouveau/nouveau

   1/*
   2 * Copyright 2011 Red Hat Inc.
   3 *
   4 * Permission is hereby granted, free of charge, to any person obtaining a
   5 * copy of this software and associated documentation files (the "Software"),
   6 * to deal in the Software without restriction, including without limitation
   7 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
   8 * and/or sell copies of the Software, and to permit persons to whom the
   9 * Software is furnished to do so, subject to the following conditions:
  10 *
  11 * The above copyright notice and this permission notice shall be included in
  12 * all copies or substantial portions of the Software.
  13 *
  14 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  15 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  16 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
  17 * THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR
  18 * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
  19 * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
  20 * OTHER DEALINGS IN THE SOFTWARE.
  21 *
  22 * Authors: Ben Skeggs
  23 */
  24
  25#include "drmP.h"
  26#include "nouveau_drv.h"
  27#include "nouveau_i2c.h"
  28#include "nouveau_gpio.h"
  29
  30static u8 *
  31dcb_gpio_table(struct drm_device *dev)
  32{
  33        u8 *dcb = dcb_table(dev);
  34        if (dcb) {
  35                if (dcb[0] >= 0x30 && dcb[1] >= 0x0c)
  36                        return ROMPTR(dev, dcb[0x0a]);
  37                if (dcb[0] >= 0x22 && dcb[-1] >= 0x13)
  38                        return ROMPTR(dev, dcb[-15]);
  39        }
  40        return NULL;
  41}
  42
  43static u8 *
  44dcb_gpio_entry(struct drm_device *dev, int idx, int ent, u8 *version)
  45{
  46        u8 *table = dcb_gpio_table(dev);
  47        if (table) {
  48                *version = table[0];
  49                if (*version < 0x30 && ent < table[2])
  50                        return table + 3 + (ent * table[1]);
  51                else if (ent < table[2])
  52                        return table + table[1] + (ent * table[3]);
  53        }
  54        return NULL;
  55}
  56
  57int
  58nouveau_gpio_drive(struct drm_device *dev, int idx, int line, int dir, int out)
  59{
  60        struct drm_nouveau_private *dev_priv = dev->dev_private;
  61        struct nouveau_gpio_engine *pgpio = &dev_priv->engine.gpio;
  62
  63        return pgpio->drive ? pgpio->drive(dev, line, dir, out) : -ENODEV;
  64}
  65
  66int
  67nouveau_gpio_sense(struct drm_device *dev, int idx, int line)
  68{
  69        struct drm_nouveau_private *dev_priv = dev->dev_private;
  70        struct nouveau_gpio_engine *pgpio = &dev_priv->engine.gpio;
  71
  72        return pgpio->sense ? pgpio->sense(dev, line) : -ENODEV;
  73}
  74
  75int
  76nouveau_gpio_find(struct drm_device *dev, int idx, u8 func, u8 line,
  77                  struct gpio_func *gpio)
  78{
  79        u8 *table, *entry, version;
  80        int i = -1;
  81
  82        if (line == 0xff && func == 0xff)
  83                return -EINVAL;
  84
  85        while ((entry = dcb_gpio_entry(dev, idx, ++i, &version))) {
  86                if (version < 0x40) {
  87                        u16 data = ROM16(entry[0]);
  88                        *gpio = (struct gpio_func) {
  89                                .line = (data & 0x001f) >> 0,
  90                                .func = (data & 0x07e0) >> 5,
  91                                .log[0] = (data & 0x1800) >> 11,
  92                                .log[1] = (data & 0x6000) >> 13,
  93                        };
  94                } else
  95                if (version < 0x41) {
  96                        *gpio = (struct gpio_func) {
  97                                .line = entry[0] & 0x1f,
  98                                .func = entry[1],
  99                                .log[0] = (entry[3] & 0x18) >> 3,
 100                                .log[1] = (entry[3] & 0x60) >> 5,
 101                        };
 102                } else {
 103                        *gpio = (struct gpio_func) {
 104                                .line = entry[0] & 0x3f,
 105                                .func = entry[1],
 106                                .log[0] = (entry[4] & 0x30) >> 4,
 107                                .log[1] = (entry[4] & 0xc0) >> 6,
 108                        };
 109                }
 110
 111                if ((line == 0xff || line == gpio->line) &&
 112                    (func == 0xff || func == gpio->func))
 113                        return 0;
 114        }
 115
 116        /* DCB 2.2, fixed TVDAC GPIO data */
 117        if ((table = dcb_table(dev)) && table[0] >= 0x22) {
 118                if (func == DCB_GPIO_TVDAC0) {
 119                        *gpio = (struct gpio_func) {
 120                                .func = DCB_GPIO_TVDAC0,
 121                                .line = table[-4] >> 4,
 122                                .log[0] = !!(table[-5] & 2),
 123                                .log[1] =  !(table[-5] & 2),
 124                        };
 125                        return 0;
 126                }
 127        }
 128
 129        /* Apple iMac G4 NV18 */
 130        if (nv_match_device(dev, 0x0189, 0x10de, 0x0010)) {
 131                if (func == DCB_GPIO_TVDAC0) {
 132                        *gpio = (struct gpio_func) {
 133                                .func = DCB_GPIO_TVDAC0,
 134                                .line = 4,
 135                                .log[0] = 0,
 136                                .log[1] = 1,
 137                        };
 138                        return 0;
 139                }
 140        }
 141
 142        return -EINVAL;
 143}
 144
 145int
 146nouveau_gpio_set(struct drm_device *dev, int idx, u8 tag, u8 line, int state)
 147{
 148        struct gpio_func gpio;
 149        int ret;
 150
 151        ret = nouveau_gpio_find(dev, idx, tag, line, &gpio);
 152        if (ret == 0) {
 153                int dir = !!(gpio.log[state] & 0x02);
 154                int out = !!(gpio.log[state] & 0x01);
 155                ret = nouveau_gpio_drive(dev, idx, gpio.line, dir, out);
 156        }
 157
 158        return ret;
 159}
 160
 161int
 162nouveau_gpio_get(struct drm_device *dev, int idx, u8 tag, u8 line)
 163{
 164        struct gpio_func gpio;
 165        int ret;
 166
 167        ret = nouveau_gpio_find(dev, idx, tag, line, &gpio);
 168        if (ret == 0) {
 169                ret = nouveau_gpio_sense(dev, idx, gpio.line);
 170                if (ret >= 0)
 171                        ret = (ret == (gpio.log[1] & 1));
 172        }
 173
 174        return ret;
 175}
 176
 177int
 178nouveau_gpio_irq(struct drm_device *dev, int idx, u8 tag, u8 line, bool on)
 179{
 180        struct drm_nouveau_private *dev_priv = dev->dev_private;
 181        struct nouveau_gpio_engine *pgpio = &dev_priv->engine.gpio;
 182        struct gpio_func gpio;
 183        int ret;
 184
 185        ret = nouveau_gpio_find(dev, idx, tag, line, &gpio);
 186        if (ret == 0) {
 187                if (idx == 0 && pgpio->irq_enable)
 188                        pgpio->irq_enable(dev, gpio.line, on);
 189                else
 190                        ret = -ENODEV;
 191        }
 192
 193        return ret;
 194}
 195
 196struct gpio_isr {
 197        struct drm_device *dev;
 198        struct list_head head;
 199        struct work_struct work;
 200        int idx;
 201        struct gpio_func func;
 202        void (*handler)(void *, int);
 203        void *data;
 204        bool inhibit;
 205};
 206
 207static void
 208nouveau_gpio_isr_bh(struct work_struct *work)
 209{
 210        struct gpio_isr *isr = container_of(work, struct gpio_isr, work);
 211        struct drm_device *dev = isr->dev;
 212        struct drm_nouveau_private *dev_priv = dev->dev_private;
 213        struct nouveau_gpio_engine *pgpio = &dev_priv->engine.gpio;
 214        unsigned long flags;
 215        int state;
 216
 217        state = nouveau_gpio_get(dev, isr->idx, isr->func.func, isr->func.line);
 218        if (state >= 0)
 219                isr->handler(isr->data, state);
 220
 221        spin_lock_irqsave(&pgpio->lock, flags);
 222        isr->inhibit = false;
 223        spin_unlock_irqrestore(&pgpio->lock, flags);
 224}
 225
 226void
 227nouveau_gpio_isr(struct drm_device *dev, int idx, u32 line_mask)
 228{
 229        struct drm_nouveau_private *dev_priv = dev->dev_private;
 230        struct nouveau_gpio_engine *pgpio = &dev_priv->engine.gpio;
 231        struct gpio_isr *isr;
 232
 233        if (idx != 0)
 234                return;
 235
 236        spin_lock(&pgpio->lock);
 237        list_for_each_entry(isr, &pgpio->isr, head) {
 238                if (line_mask & (1 << isr->func.line)) {
 239                        if (isr->inhibit)
 240                                continue;
 241                        isr->inhibit = true;
 242                        schedule_work(&isr->work);
 243                }
 244        }
 245        spin_unlock(&pgpio->lock);
 246}
 247
 248int
 249nouveau_gpio_isr_add(struct drm_device *dev, int idx, u8 tag, u8 line,
 250                     void (*handler)(void *, int), void *data)
 251{
 252        struct drm_nouveau_private *dev_priv = dev->dev_private;
 253        struct nouveau_gpio_engine *pgpio = &dev_priv->engine.gpio;
 254        struct gpio_isr *isr;
 255        unsigned long flags;
 256        int ret;
 257
 258        isr = kzalloc(sizeof(*isr), GFP_KERNEL);
 259        if (!isr)
 260                return -ENOMEM;
 261
 262        ret = nouveau_gpio_find(dev, idx, tag, line, &isr->func);
 263        if (ret) {
 264                kfree(isr);
 265                return ret;
 266        }
 267
 268        INIT_WORK(&isr->work, nouveau_gpio_isr_bh);
 269        isr->dev = dev;
 270        isr->handler = handler;
 271        isr->data = data;
 272        isr->idx = idx;
 273
 274        spin_lock_irqsave(&pgpio->lock, flags);
 275        list_add(&isr->head, &pgpio->isr);
 276        spin_unlock_irqrestore(&pgpio->lock, flags);
 277        return 0;
 278}
 279
 280void
 281nouveau_gpio_isr_del(struct drm_device *dev, int idx, u8 tag, u8 line,
 282                     void (*handler)(void *, int), void *data)
 283{
 284        struct drm_nouveau_private *dev_priv = dev->dev_private;
 285        struct nouveau_gpio_engine *pgpio = &dev_priv->engine.gpio;
 286        struct gpio_isr *isr, *tmp;
 287        struct gpio_func func;
 288        unsigned long flags;
 289        LIST_HEAD(tofree);
 290        int ret;
 291
 292        ret = nouveau_gpio_find(dev, idx, tag, line, &func);
 293        if (ret == 0) {
 294                spin_lock_irqsave(&pgpio->lock, flags);
 295                list_for_each_entry_safe(isr, tmp, &pgpio->isr, head) {
 296                        if (memcmp(&isr->func, &func, sizeof(func)) ||
 297                            isr->idx != idx ||
 298                            isr->handler != handler || isr->data != data)
 299                                continue;
 300                        list_move(&isr->head, &tofree);
 301                }
 302                spin_unlock_irqrestore(&pgpio->lock, flags);
 303
 304                list_for_each_entry_safe(isr, tmp, &tofree, head) {
 305                        flush_work_sync(&isr->work);
 306                        kfree(isr);
 307                }
 308        }
 309}
 310
 311int
 312nouveau_gpio_create(struct drm_device *dev)
 313{
 314        struct drm_nouveau_private *dev_priv = dev->dev_private;
 315        struct nouveau_gpio_engine *pgpio = &dev_priv->engine.gpio;
 316
 317        INIT_LIST_HEAD(&pgpio->isr);
 318        spin_lock_init(&pgpio->lock);
 319
 320        return nouveau_gpio_init(dev);
 321}
 322
 323void
 324nouveau_gpio_destroy(struct drm_device *dev)
 325{
 326        struct drm_nouveau_private *dev_priv = dev->dev_private;
 327        struct nouveau_gpio_engine *pgpio = &dev_priv->engine.gpio;
 328
 329        nouveau_gpio_fini(dev);
 330        BUG_ON(!list_empty(&pgpio->isr));
 331}
 332
 333int
 334nouveau_gpio_init(struct drm_device *dev)
 335{
 336        struct drm_nouveau_private *dev_priv = dev->dev_private;
 337        struct nouveau_gpio_engine *pgpio = &dev_priv->engine.gpio;
 338        int ret = 0;
 339
 340        if (pgpio->init)
 341                ret = pgpio->init(dev);
 342
 343        return ret;
 344}
 345
 346void
 347nouveau_gpio_fini(struct drm_device *dev)
 348{
 349        struct drm_nouveau_private *dev_priv = dev->dev_private;
 350        struct nouveau_gpio_engine *pgpio = &dev_priv->engine.gpio;
 351
 352        if (pgpio->fini)
 353                pgpio->fini(dev);
 354}
 355
 356void
 357nouveau_gpio_reset(struct drm_device *dev)
 358{
 359        struct drm_nouveau_private *dev_priv = dev->dev_private;
 360        u8 *entry, version;
 361        int ent = -1;
 362
 363        while ((entry = dcb_gpio_entry(dev, 0, ++ent, &version))) {
 364                u8 func = 0xff, line, defs, unk0, unk1;
 365                if (version >= 0x41) {
 366                        defs = !!(entry[0] & 0x80);
 367                        line = entry[0] & 0x3f;
 368                        func = entry[1];
 369                        unk0 = entry[2];
 370                        unk1 = entry[3] & 0x1f;
 371                } else
 372                if (version >= 0x40) {
 373                        line = entry[0] & 0x1f;
 374                        func = entry[1];
 375                        defs = !!(entry[3] & 0x01);
 376                        unk0 = !!(entry[3] & 0x02);
 377                        unk1 = !!(entry[3] & 0x04);
 378                } else {
 379                        break;
 380                }
 381
 382                if (func == 0xff)
 383                        continue;
 384
 385                nouveau_gpio_func_set(dev, func, defs);
 386
 387                if (dev_priv->card_type >= NV_D0) {
 388                        nv_mask(dev, 0x00d610 + (line * 4), 0xff, unk0);
 389                        if (unk1--)
 390                                nv_mask(dev, 0x00d640 + (unk1 * 4), 0xff, line);
 391                } else
 392                if (dev_priv->card_type >= NV_50) {
 393                        static const u32 regs[] = { 0xe100, 0xe28c };
 394                        u32 val = (unk1 << 16) | unk0;
 395                        u32 reg = regs[line >> 4]; line &= 0x0f;
 396
 397                        nv_mask(dev, reg, 0x00010001 << line, val << line);
 398                }
 399        }
 400}
 401