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