drivers/gpu/drm/nouveau/nvkm/subdev/gpio/base.c

   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 #include "priv.h"
  25
  26 #include <core/option.h>
  27 #include <core/notify.h>
  28
  29 static int
  30 nvkm_gpio_drive(struct nvkm_gpio *gpio, int idx, int line, int dir, int out)
  31 {
  32         return gpio->func->drive(gpio, line, dir, out);
  33 }
  34
  35 static int
  36 nvkm_gpio_sense(struct nvkm_gpio *gpio, int idx, int line)
  37 {
  38         return gpio->func->sense(gpio, line);
  39 }
  40
  41 void
  42 nvkm_gpio_reset(struct nvkm_gpio *gpio, u8 func)
  43 {
  44         if (gpio->func->reset)
  45                 gpio->func->reset(gpio, func);
  46 }
  47
  48 int
  49 nvkm_gpio_find(struct nvkm_gpio *gpio, int idx, u8 tag, u8 line,
  50                struct dcb_gpio_func *func)
  51 {
  52         struct nvkm_device *device = gpio->subdev.device;
  53         struct nvkm_bios *bios = device->bios;
  54         u8  ver, len;
  55         u16 data;
  56
  57         if (line == 0xff && tag == 0xff)
  58                 return -EINVAL;
  59
  60         data = dcb_gpio_match(bios, idx, tag, line, &ver, &len, func);
  61         if (data)
  62                 return 0;
  63
  64         /* Apple iMac G4 NV18 */
  65         if (device->quirk && device->quirk->tv_gpio) {
  66                 if (tag == DCB_GPIO_TVDAC0) {
  67                         *func = (struct dcb_gpio_func) {
  68                                 .func = DCB_GPIO_TVDAC0,
  69                                 .line = device->quirk->tv_gpio,
  70                                 .log[0] = 0,
  71                                 .log[1] = 1,
  72                         };
  73                         return 0;
  74                 }
  75         }
  76
  77         return -ENOENT;
  78 }
  79
  80 int
  81 nvkm_gpio_set(struct nvkm_gpio *gpio, int idx, u8 tag, u8 line, int state)
  82 {
  83         struct dcb_gpio_func func;
  84         int ret;
  85
  86         ret = nvkm_gpio_find(gpio, idx, tag, line, &func);
  87         if (ret == 0) {
  88                 int dir = !!(func.log[state] & 0x02);
  89                 int out = !!(func.log[state] & 0x01);
  90                 ret = nvkm_gpio_drive(gpio, idx, func.line, dir, out);
  91         }
  92
  93         return ret;
  94 }
  95
  96 int
  97 nvkm_gpio_get(struct nvkm_gpio *gpio, int idx, u8 tag, u8 line)
  98 {
  99         struct dcb_gpio_func func;
 100         int ret;
 101
 102         ret = nvkm_gpio_find(gpio, idx, tag, line, &func);
 103         if (ret == 0) {
 104                 ret = nvkm_gpio_sense(gpio, idx, func.line);
 105                 if (ret >= 0)
 106                         ret = (ret == (func.log[1] & 1));
 107         }
 108
 109         return ret;
 110 }
 111
 112 static void
 113 nvkm_gpio_intr_fini(struct nvkm_event *event, int type, int index)
 114 {
 115         struct nvkm_gpio *gpio = container_of(event, typeof(*gpio), event);
 116         gpio->func->intr_mask(gpio, type, 1 << index, 0);
 117 }
 118
 119 static void
 120 nvkm_gpio_intr_init(struct nvkm_event *event, int type, int index)
 121 {
 122         struct nvkm_gpio *gpio = container_of(event, typeof(*gpio), event);
 123         gpio->func->intr_mask(gpio, type, 1 << index, 1 << index);
 124 }
 125
 126 static int
 127 nvkm_gpio_intr_ctor(struct nvkm_object *object, void *data, u32 size,
 128                     struct nvkm_notify *notify)
 129 {
 130         struct nvkm_gpio_ntfy_req *req = data;
 131         if (!WARN_ON(size != sizeof(*req))) {
 132                 notify->size  = sizeof(struct nvkm_gpio_ntfy_rep);
 133                 notify->types = req->mask;
 134                 notify->index = req->line;
 135                 return 0;
 136         }
 137         return -EINVAL;
 138 }
 139
 140 static const struct nvkm_event_func
 141 nvkm_gpio_intr_func = {
 142         .ctor = nvkm_gpio_intr_ctor,
 143         .init = nvkm_gpio_intr_init,
 144         .fini = nvkm_gpio_intr_fini,
 145 };
 146
 147 static void
 148 nvkm_gpio_intr(struct nvkm_subdev *subdev)
 149 {
 150         struct nvkm_gpio *gpio = nvkm_gpio(subdev);
 151         u32 hi, lo, i;
 152
 153         gpio->func->intr_stat(gpio, &hi, &lo);
 154
 155         for (i = 0; (hi | lo) && i < gpio->func->lines; i++) {
 156                 struct nvkm_gpio_ntfy_rep rep = {
 157                         .mask = (NVKM_GPIO_HI * !!(hi & (1 << i))) |
 158                                 (NVKM_GPIO_LO * !!(lo & (1 << i))),
 159                 };
 160                 nvkm_event_send(&gpio->event, rep.mask, i, &rep, sizeof(rep));
 161         }
 162 }
 163
 164 static int
 165 nvkm_gpio_fini(struct nvkm_subdev *subdev, bool suspend)
 166 {
 167         struct nvkm_gpio *gpio = nvkm_gpio(subdev);
 168         u32 mask = (1ULL << gpio->func->lines) - 1;
 169
 170         gpio->func->intr_mask(gpio, NVKM_GPIO_TOGGLED, mask, 0);
 171         gpio->func->intr_stat(gpio, &mask, &mask);
 172         return 0;
 173 }
 174
 175 static const struct dmi_system_id gpio_reset_ids[] = {
 176         {
 177                 .ident = "Apple Macbook 10,1",
 178                 .matches = {
 179                         DMI_MATCH(DMI_SYS_VENDOR, "Apple Inc."),
 180                         DMI_MATCH(DMI_PRODUCT_NAME, "MacBookPro10,1"),
 181                 }
 182         },
 183         { }
 184 };
 185
 186 static enum dcb_gpio_func_name power_checks[] = {
 187         DCB_GPIO_THERM_EXT_POWER_EVENT,
 188         DCB_GPIO_POWER_ALERT,
 189         DCB_GPIO_EXT_POWER_LOW,
 190 };
 191
 192 static int
 193 nvkm_gpio_init(struct nvkm_subdev *subdev)
 194 {
 195         struct nvkm_gpio *gpio = nvkm_gpio(subdev);
 196         struct dcb_gpio_func func;
 197         int ret;
 198         int i;
 199
 200         if (dmi_check_system(gpio_reset_ids))
 201                 nvkm_gpio_reset(gpio, DCB_GPIO_UNUSED);
 202
 203         if (nvkm_boolopt(subdev->device->cfgopt, "NvPowerChecks", true)) {
 204                 for (i = 0; i < ARRAY_SIZE(power_checks); ++i) {
 205                         ret = nvkm_gpio_find(gpio, 0, power_checks[i],
 206                                              DCB_GPIO_UNUSED, &func);
 207                         if (ret)
 208                                 continue;
 209
 210                         ret = nvkm_gpio_get(gpio, 0, func.func, func.line);
 211                         if (!ret)
 212                                 continue;
 213
 214                         nvkm_error(&gpio->subdev,
 215                                    "GPU is missing power, check its power "
 216                                    "cables.  Boot with "
 217                                    "nouveau.config=NvPowerChecks=0 to "
 218                                    "disable.\n");
 219                         return -EINVAL;
 220                 }
 221         }
 222
 223         return 0;
 224 }
 225
 226 static void *
 227 nvkm_gpio_dtor(struct nvkm_subdev *subdev)
 228 {
 229         struct nvkm_gpio *gpio = nvkm_gpio(subdev);
 230         nvkm_event_fini(&gpio->event);
 231         return gpio;
 232 }
 233
 234 static const struct nvkm_subdev_func
 235 nvkm_gpio = {
 236         .dtor = nvkm_gpio_dtor,
 237         .init = nvkm_gpio_init,
 238         .fini = nvkm_gpio_fini,
 239         .intr = nvkm_gpio_intr,
 240 };
 241
 242 int
 243 nvkm_gpio_new_(const struct nvkm_gpio_func *func, struct nvkm_device *device,
 244                int index, struct nvkm_gpio **pgpio)
 245 {
 246         struct nvkm_gpio *gpio;
 247
 248         if (!(gpio = *pgpio = kzalloc(sizeof(*gpio), GFP_KERNEL)))
 249                 return -ENOMEM;
 250
 251         nvkm_subdev_ctor(&nvkm_gpio, device, index, &gpio->subdev);
 252         gpio->func = func;
 253
 254         return nvkm_event_init(&nvkm_gpio_intr_func, 2, func->lines,
 255                                &gpio->event);
 256 }