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
   5  * it under the terms of the GNU General Public License version 2 as
   6  * published by the Free Software Foundation.
   7  */
   8
   9 #include <linux/clk.h>
  10 #include <linux/iommu.h>
  11 #include <linux/of_device.h>
  12
  13 #include "drm.h"
  14 #include "gem.h"
  15 #include "gr2d.h"
  16
  17 struct gr2d_soc {
  18         unsigned int version;
  19 };
  20
  21 struct gr2d {
  22         struct iommu_group *group;
  23         struct tegra_drm_client client;
  24         struct host1x_channel *channel;
  25         struct clk *clk;
  26
  27         const struct gr2d_soc *soc;
  28
  29         DECLARE_BITMAP(addr_regs, GR2D_NUM_REGS);
  30 };
  31
  32 static inline struct gr2d *to_gr2d(struct tegra_drm_client *client)
  33 {
  34         return container_of(client, struct gr2d, client);
  35 }
  36
  37 static int gr2d_init(struct host1x_client *client)
  38 {
  39         struct tegra_drm_client *drm = host1x_to_drm_client(client);
  40         struct drm_device *dev = dev_get_drvdata(client->parent);
  41         unsigned long flags = HOST1X_SYNCPT_HAS_BASE;
  42         struct gr2d *gr2d = to_gr2d(drm);
  43         int err;
  44
  45         gr2d->channel = host1x_channel_request(client->dev);
  46         if (!gr2d->channel)
  47                 return -ENOMEM;
  48
  49         client->syncpts[0] = host1x_syncpt_request(client, flags);
  50         if (!client->syncpts[0]) {
  51                 err = -ENOMEM;
  52                 dev_err(client->dev, "failed to request syncpoint: %d\n", err);
  53                 goto put;
  54         }
  55
  56         gr2d->group = host1x_client_iommu_attach(client, false);
  57         if (IS_ERR(gr2d->group)) {
  58                 err = PTR_ERR(gr2d->group);
  59                 dev_err(client->dev, "failed to attach to domain: %d\n", err);
  60                 goto free;
  61         }
  62
  63         err = tegra_drm_register_client(dev->dev_private, drm);
  64         if (err < 0) {
  65                 dev_err(client->dev, "failed to register client: %d\n", err);
  66                 goto detach;
  67         }
  68
  69         return 0;
  70
  71 detach:
  72         host1x_client_iommu_detach(client, gr2d->group);
  73 free:
  74         host1x_syncpt_free(client->syncpts[0]);
  75 put:
  76         host1x_channel_put(gr2d->channel);
  77         return err;
  78 }
  79
  80 static int gr2d_exit(struct host1x_client *client)
  81 {
  82         struct tegra_drm_client *drm = host1x_to_drm_client(client);
  83         struct drm_device *dev = dev_get_drvdata(client->parent);
  84         struct tegra_drm *tegra = dev->dev_private;
  85         struct gr2d *gr2d = to_gr2d(drm);
  86         int err;
  87
  88         err = tegra_drm_unregister_client(tegra, drm);
  89         if (err < 0)
  90                 return err;
  91
  92         host1x_client_iommu_detach(client, gr2d->group);
  93         host1x_syncpt_free(client->syncpts[0]);
  94         host1x_channel_put(gr2d->channel);
  95
  96         return 0;
  97 }
  98
  99 static const struct host1x_client_ops gr2d_client_ops = {
 100         .init = gr2d_init,
 101         .exit = gr2d_exit,
 102 };
 103
 104 static int gr2d_open_channel(struct tegra_drm_client *client,
 105                              struct tegra_drm_context *context)
 106 {
 107         struct gr2d *gr2d = to_gr2d(client);
 108
 109         context->channel = host1x_channel_get(gr2d->channel);
 110         if (!context->channel)
 111                 return -ENOMEM;
 112
 113         return 0;
 114 }
 115
 116 static void gr2d_close_channel(struct tegra_drm_context *context)
 117 {
 118         host1x_channel_put(context->channel);
 119 }
 120
 121 static int gr2d_is_addr_reg(struct device *dev, u32 class, u32 offset)
 122 {
 123         struct gr2d *gr2d = dev_get_drvdata(dev);
 124
 125         switch (class) {
 126         case HOST1X_CLASS_HOST1X:
 127                 if (offset == 0x2b)
 128                         return 1;
 129
 130                 break;
 131
 132         case HOST1X_CLASS_GR2D:
 133         case HOST1X_CLASS_GR2D_SB:
 134                 if (offset >= GR2D_NUM_REGS)
 135                         break;
 136
 137                 if (test_bit(offset, gr2d->addr_regs))
 138                         return 1;
 139
 140                 break;
 141         }
 142
 143         return 0;
 144 }
 145
 146 static int gr2d_is_valid_class(u32 class)
 147 {
 148         return (class == HOST1X_CLASS_GR2D ||
 149                 class == HOST1X_CLASS_GR2D_SB);
 150 }
 151
 152 static const struct tegra_drm_client_ops gr2d_ops = {
 153         .open_channel = gr2d_open_channel,
 154         .close_channel = gr2d_close_channel,
 155         .is_addr_reg = gr2d_is_addr_reg,
 156         .is_valid_class = gr2d_is_valid_class,
 157         .submit = tegra_drm_submit,
 158 };
 159
 160 static const struct gr2d_soc tegra20_gr2d_soc = {
 161         .version = 0x20,
 162 };
 163
 164 static const struct gr2d_soc tegra30_gr2d_soc = {
 165         .version = 0x30,
 166 };
 167
 168 static const struct of_device_id gr2d_match[] = {
 169         { .compatible = "nvidia,tegra30-gr2d", .data = &tegra20_gr2d_soc },
 170         { .compatible = "nvidia,tegra20-gr2d", .data = &tegra30_gr2d_soc },
 171         { },
 172 };
 173 MODULE_DEVICE_TABLE(of, gr2d_match);
 174
 175 static const u32 gr2d_addr_regs[] = {
 176         GR2D_UA_BASE_ADDR,
 177         GR2D_VA_BASE_ADDR,
 178         GR2D_PAT_BASE_ADDR,
 179         GR2D_DSTA_BASE_ADDR,
 180         GR2D_DSTB_BASE_ADDR,
 181         GR2D_DSTC_BASE_ADDR,
 182         GR2D_SRCA_BASE_ADDR,
 183         GR2D_SRCB_BASE_ADDR,
 184         GR2D_SRC_BASE_ADDR_SB,
 185         GR2D_DSTA_BASE_ADDR_SB,
 186         GR2D_DSTB_BASE_ADDR_SB,
 187         GR2D_UA_BASE_ADDR_SB,
 188         GR2D_VA_BASE_ADDR_SB,
 189 };
 190
 191 static int gr2d_probe(struct platform_device *pdev)
 192 {
 193         struct device *dev = &pdev->dev;
 194         struct host1x_syncpt **syncpts;
 195         struct gr2d *gr2d;
 196         unsigned int i;
 197         int err;
 198
 199         gr2d = devm_kzalloc(dev, sizeof(*gr2d), GFP_KERNEL);
 200         if (!gr2d)
 201                 return -ENOMEM;
 202
 203         gr2d->soc = of_device_get_match_data(dev);
 204
 205         syncpts = devm_kzalloc(dev, sizeof(*syncpts), GFP_KERNEL);
 206         if (!syncpts)
 207                 return -ENOMEM;
 208
 209         gr2d->clk = devm_clk_get(dev, NULL);
 210         if (IS_ERR(gr2d->clk)) {
 211                 dev_err(dev, "cannot get clock\n");
 212                 return PTR_ERR(gr2d->clk);
 213         }
 214
 215         err = clk_prepare_enable(gr2d->clk);
 216         if (err) {
 217                 dev_err(dev, "cannot turn on clock\n");
 218                 return err;
 219         }
 220
 221         INIT_LIST_HEAD(&gr2d->client.base.list);
 222         gr2d->client.base.ops = &gr2d_client_ops;
 223         gr2d->client.base.dev = dev;
 224         gr2d->client.base.class = HOST1X_CLASS_GR2D;
 225         gr2d->client.base.syncpts = syncpts;
 226         gr2d->client.base.num_syncpts = 1;
 227
 228         INIT_LIST_HEAD(&gr2d->client.list);
 229         gr2d->client.version = gr2d->soc->version;
 230         gr2d->client.ops = &gr2d_ops;
 231
 232         err = host1x_client_register(&gr2d->client.base);
 233         if (err < 0) {
 234                 dev_err(dev, "failed to register host1x client: %d\n", err);
 235                 clk_disable_unprepare(gr2d->clk);
 236                 return err;
 237         }
 238
 239         /* initialize address register map */
 240         for (i = 0; i < ARRAY_SIZE(gr2d_addr_regs); i++)
 241                 set_bit(gr2d_addr_regs[i], gr2d->addr_regs);
 242
 243         platform_set_drvdata(pdev, gr2d);
 244
 245         return 0;
 246 }
 247
 248 static int gr2d_remove(struct platform_device *pdev)
 249 {
 250         struct gr2d *gr2d = platform_get_drvdata(pdev);
 251         int err;
 252
 253         err = host1x_client_unregister(&gr2d->client.base);
 254         if (err < 0) {
 255                 dev_err(&pdev->dev, "failed to unregister host1x client: %d\n",
 256                         err);
 257                 return err;
 258         }
 259
 260         clk_disable_unprepare(gr2d->clk);
 261
 262         return 0;
 263 }
 264
 265 struct platform_driver tegra_gr2d_driver = {
 266         .driver = {
 267                 .name = "tegra-gr2d",
 268                 .of_match_table = gr2d_match,
 269         },
 270         .probe = gr2d_probe,
 271         .remove = gr2d_remove,
 272 };