drivers/gpu/drm/tegra/gr2d.c

   1 /*
   2  * Copyright (c) 2012-2013, NVIDIA Corporation.
   3  *
   4  * This program is free software; you can redistribute it and/or modify it
   5  * under the terms and conditions of the GNU General Public License,
   6  * version 2, as published by the Free Software Foundation.
   7  *
   8  * This program is distributed in the hope it will be useful, but WITHOUT
   9  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  10  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
  11  * more details.
  12  *
  13  * You should have received a copy of the GNU General Public License
  14  * along with this program.  If not, see <http://www.gnu.org/licenses/>.
  15  */
  16
  17 #include <linux/clk.h>
  18
  19 #include "drm.h"
  20 #include "gem.h"
  21 #include "gr2d.h"
  22
  23 struct gr2d {
  24         struct tegra_drm_client client;
  25         struct host1x_channel *channel;
  26         struct clk *clk;
  27
  28         DECLARE_BITMAP(addr_regs, GR2D_NUM_REGS);
  29 };
  30
  31 static inline struct gr2d *to_gr2d(struct tegra_drm_client *client)
  32 {
  33         return container_of(client, struct gr2d, client);
  34 }
  35
  36 static int gr2d_init(struct host1x_client *client)
  37 {
  38         struct tegra_drm_client *drm = host1x_to_drm_client(client);
  39         struct tegra_drm *tegra = dev_get_drvdata(client->parent);
  40         struct gr2d *gr2d = to_gr2d(drm);
  41
  42         gr2d->channel = host1x_channel_request(client->dev);
  43         if (!gr2d->channel)
  44                 return -ENOMEM;
  45
  46         client->syncpts[0] = host1x_syncpt_request(client->dev, false);
  47         if (!client->syncpts[0]) {
  48                 host1x_channel_free(gr2d->channel);
  49                 return -ENOMEM;
  50         }
  51
  52         return tegra_drm_register_client(tegra, drm);
  53 }
  54
  55 static int gr2d_exit(struct host1x_client *client)
  56 {
  57         struct tegra_drm_client *drm = host1x_to_drm_client(client);
  58         struct tegra_drm *tegra = dev_get_drvdata(client->parent);
  59         struct gr2d *gr2d = to_gr2d(drm);
  60         int err;
  61
  62         err = tegra_drm_unregister_client(tegra, drm);
  63         if (err < 0)
  64                 return err;
  65
  66         host1x_syncpt_free(client->syncpts[0]);
  67         host1x_channel_free(gr2d->channel);
  68
  69         return 0;
  70 }
  71
  72 static const struct host1x_client_ops gr2d_client_ops = {
  73         .init = gr2d_init,
  74         .exit = gr2d_exit,
  75 };
  76
  77 static int gr2d_open_channel(struct tegra_drm_client *client,
  78                              struct tegra_drm_context *context)
  79 {
  80         struct gr2d *gr2d = to_gr2d(client);
  81
  82         context->channel = host1x_channel_get(gr2d->channel);
  83         if (!context->channel)
  84                 return -ENOMEM;
  85
  86         return 0;
  87 }
  88
  89 static void gr2d_close_channel(struct tegra_drm_context *context)
  90 {
  91         host1x_channel_put(context->channel);
  92 }
  93
  94 static int gr2d_is_addr_reg(struct device *dev, u32 class, u32 offset)
  95 {
  96         struct gr2d *gr2d = dev_get_drvdata(dev);
  97
  98         switch (class) {
  99         case HOST1X_CLASS_HOST1X:
 100                 if (offset == 0x2b)
 101                         return 1;
 102
 103                 break;
 104
 105         case HOST1X_CLASS_GR2D:
 106         case HOST1X_CLASS_GR2D_SB:
 107                 if (offset >= GR2D_NUM_REGS)
 108                         break;
 109
 110                 if (test_bit(offset, gr2d->addr_regs))
 111                         return 1;
 112
 113                 break;
 114         }
 115
 116         return 0;
 117 }
 118
 119 static const struct tegra_drm_client_ops gr2d_ops = {
 120         .open_channel = gr2d_open_channel,
 121         .close_channel = gr2d_close_channel,
 122         .is_addr_reg = gr2d_is_addr_reg,
 123         .submit = tegra_drm_submit,
 124 };
 125
 126 static const struct of_device_id gr2d_match[] = {
 127         { .compatible = "nvidia,tegra30-gr2d" },
 128         { .compatible = "nvidia,tegra20-gr2d" },
 129         { },
 130 };
 131
 132 static const u32 gr2d_addr_regs[] = {
 133         GR2D_UA_BASE_ADDR,
 134         GR2D_VA_BASE_ADDR,
 135         GR2D_PAT_BASE_ADDR,
 136         GR2D_DSTA_BASE_ADDR,
 137         GR2D_DSTB_BASE_ADDR,
 138         GR2D_DSTC_BASE_ADDR,
 139         GR2D_SRCA_BASE_ADDR,
 140         GR2D_SRCB_BASE_ADDR,
 141         GR2D_SRC_BASE_ADDR_SB,
 142         GR2D_DSTA_BASE_ADDR_SB,
 143         GR2D_DSTB_BASE_ADDR_SB,
 144         GR2D_UA_BASE_ADDR_SB,
 145         GR2D_VA_BASE_ADDR_SB,
 146 };
 147
 148 static int gr2d_probe(struct platform_device *pdev)
 149 {
 150         struct device *dev = &pdev->dev;
 151         struct host1x_syncpt **syncpts;
 152         struct gr2d *gr2d;
 153         unsigned int i;
 154         int err;
 155
 156         gr2d = devm_kzalloc(dev, sizeof(*gr2d), GFP_KERNEL);
 157         if (!gr2d)
 158                 return -ENOMEM;
 159
 160         syncpts = devm_kzalloc(dev, sizeof(*syncpts), GFP_KERNEL);
 161         if (!syncpts)
 162                 return -ENOMEM;
 163
 164         gr2d->clk = devm_clk_get(dev, NULL);
 165         if (IS_ERR(gr2d->clk)) {
 166                 dev_err(dev, "cannot get clock\n");
 167                 return PTR_ERR(gr2d->clk);
 168         }
 169
 170         err = clk_prepare_enable(gr2d->clk);
 171         if (err) {
 172                 dev_err(dev, "cannot turn on clock\n");
 173                 return err;
 174         }
 175
 176         INIT_LIST_HEAD(&gr2d->client.base.list);
 177         gr2d->client.base.ops = &gr2d_client_ops;
 178         gr2d->client.base.dev = dev;
 179         gr2d->client.base.class = HOST1X_CLASS_GR2D;
 180         gr2d->client.base.syncpts = syncpts;
 181         gr2d->client.base.num_syncpts = 1;
 182
 183         INIT_LIST_HEAD(&gr2d->client.list);
 184         gr2d->client.ops = &gr2d_ops;
 185
 186         err = host1x_client_register(&gr2d->client.base);
 187         if (err < 0) {
 188                 dev_err(dev, "failed to register host1x client: %d\n", err);
 189                 return err;
 190         }
 191
 192         /* initialize address register map */
 193         for (i = 0; i < ARRAY_SIZE(gr2d_addr_regs); i++)
 194                 set_bit(gr2d_addr_regs[i], gr2d->addr_regs);
 195
 196         platform_set_drvdata(pdev, gr2d);
 197
 198         return 0;
 199 }
 200
 201 static int gr2d_remove(struct platform_device *pdev)
 202 {
 203         struct gr2d *gr2d = platform_get_drvdata(pdev);
 204         int err;
 205
 206         err = host1x_client_unregister(&gr2d->client.base);
 207         if (err < 0) {
 208                 dev_err(&pdev->dev, "failed to unregister host1x client: %d\n",
 209                         err);
 210                 return err;
 211         }
 212
 213         clk_disable_unprepare(gr2d->clk);
 214
 215         return 0;
 216 }
 217
 218 struct platform_driver tegra_gr2d_driver = {
 219         .driver = {
 220                 .name = "tegra-gr2d",
 221                 .of_match_table = gr2d_match,
 222         },
 223         .probe = gr2d_probe,
 224         .remove = gr2d_remove,
 225 };