LXR linux/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
  32static int
  33nvkm_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
  54void
  55nvkm_conn_fini(struct nvkm_conn *conn)
  56{
  57        nvkm_notify_put(&conn->hpd);
  58}
  59
  60void
  61nvkm_conn_init(struct nvkm_conn *conn)
  62{
  63        nvkm_notify_get(&conn->hpd);
  64}
  65
  66void
  67nvkm_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
  77static void
  78nvkm_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
 124int
 125nvkm_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}
 133