drivers/gpu/drm/nouveau/nvkm/engine/disp/conn.c

   1 /*
   2  * Copyright 2014 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 "conn.h"
  25 #include "outp.h"
  26 #include "priv.h"
  27
  28 #include <subdev/gpio.h>
  29
  30 #include <nvif/event.h>
  31
  32 static int
  33 nvkm_conn_hpd(struct nvkm_notify *notify)
  34 {
  35         struct nvkm_conn *conn = container_of(notify, typeof(*conn), hpd);
  36         struct nvkm_disp *disp = conn->disp;
  37         struct nvkm_gpio *gpio = disp->engine.subdev.device->gpio;
  38         const struct nvkm_gpio_ntfy_rep *line = notify->data;
  39         struct nvif_notify_conn_rep_v0 rep;
  40         int index = conn->index;
  41
  42         CONN_DBG(conn, "HPD: %d", line->mask);
  43
  44         if (!nvkm_gpio_get(gpio, 0, DCB_GPIO_UNUSED, conn->hpd.index))
  45                 rep.mask = NVIF_NOTIFY_CONN_V0_UNPLUG;
  46         else
  47                 rep.mask = NVIF_NOTIFY_CONN_V0_PLUG;
  48         rep.version = 0;
  49
  50         nvkm_event_send(&disp->hpd, rep.mask, index, &rep, sizeof(rep));
  51         return NVKM_NOTIFY_KEEP;
  52 }
  53
  54 void
  55 nvkm_conn_fini(struct nvkm_conn *conn)
  56 {
  57         nvkm_notify_put(&conn->hpd);
  58 }
  59
  60 void
  61 nvkm_conn_init(struct nvkm_conn *conn)
  62 {
  63         nvkm_notify_get(&conn->hpd);
  64 }
  65
  66 void
  67 nvkm_conn_del(struct nvkm_conn **pconn)
  68 {
  69         struct nvkm_conn *conn = *pconn;
  70         if (conn) {
  71                 nvkm_notify_fini(&conn->hpd);
  72                 kfree(*pconn);
  73                 *pconn = NULL;
  74         }
  75 }
  76
  77 static void
  78 nvkm_conn_ctor(struct nvkm_disp *disp, int index, struct nvbios_connE *info,
  79                struct nvkm_conn *conn)
  80 {
  81         static const u8 hpd[] = { 0x07, 0x08, 0x51, 0x52, 0x5e, 0x5f, 0x60 };
  82         struct nvkm_gpio *gpio = disp->engine.subdev.device->gpio;
  83         struct dcb_gpio_func func;
  84         int ret;
  85
  86         conn->disp = disp;
  87         conn->index = index;
  88         conn->info = *info;
  89
  90         CONN_DBG(conn, "type %02x loc %d hpd %02x dp %x di %x sr %x lcdid %x",
  91                  info->type, info->location, info->hpd, info->dp,
  92                  info->di, info->sr, info->lcdid);
  93
  94         if ((info->hpd = ffs(info->hpd))) {
  95                 if (--info->hpd >= ARRAY_SIZE(hpd)) {
  96                         CONN_ERR(conn, "hpd %02x unknown", info->hpd);
  97                         return;
  98                 }
  99                 info->hpd = hpd[info->hpd];
 100
 101                 ret = nvkm_gpio_find(gpio, 0, info->hpd, DCB_GPIO_UNUSED, &func);
 102                 if (ret) {
 103                         CONN_ERR(conn, "func %02x lookup failed, %d",
 104                                  info->hpd, ret);
 105                         return;
 106                 }
 107
 108                 ret = nvkm_notify_init(NULL, &gpio->event, nvkm_conn_hpd,
 109                                        true, &(struct nvkm_gpio_ntfy_req) {
 110                                         .mask = NVKM_GPIO_TOGGLED,
 111                                         .line = func.line,
 112                                        },
 113                                        sizeof(struct nvkm_gpio_ntfy_req),
 114                                        sizeof(struct nvkm_gpio_ntfy_rep),
 115                                        &conn->hpd);
 116                 if (ret) {
 117                         CONN_ERR(conn, "func %02x failed, %d", info->hpd, ret);
 118                 } else {
 119                         CONN_DBG(conn, "func %02x (HPD)", info->hpd);
 120                 }
 121         }
 122 }
 123
 124 int
 125 nvkm_conn_new(struct nvkm_disp *disp, int index, struct nvbios_connE *info,
 126               struct nvkm_conn **pconn)
 127 {
 128         if (!(*pconn = kzalloc(sizeof(**pconn), GFP_KERNEL)))
 129                 return -ENOMEM;
 130         nvkm_conn_ctor(disp, index, info, *pconn);
 131         return 0;
 132 }