kernel/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
  11 #include "drm.h"
  12 #include "gem.h"
  13 #include "gr2d.h"
  14
  15 struct gr2d {
  16         struct tegra_drm_client client;
  17         struct host1x_channel *channel;
  18         struct clk *clk;
  19
  20         DECLARE_BITMAP(addr_regs, GR2D_NUM_REGS);
  21 };
  22
  23 static inline struct gr2d *to_gr2d(struct tegra_drm_client *client)
  24 {
  25         return container_of(client, struct gr2d, client);
  26 }
  27
  28 static int gr2d_init(struct host1x_client *client)
  29 {
  30         struct tegra_drm_client *drm = host1x_to_drm_client(client);
  31         struct drm_device *dev = dev_get_drvdata(client->parent);
  32         unsigned long flags = HOST1X_SYNCPT_HAS_BASE;
  33         struct gr2d *gr2d = to_gr2d(drm);
  34
  35         gr2d->channel = host1x_channel_request(client->dev);
  36         if (!gr2d->channel)
  37                 return -ENOMEM;
  38
  39         client->syncpts[0] = host1x_syncpt_request(client->dev, flags);
  40         if (!client->syncpts[0]) {
  41                 host1x_channel_free(gr2d->channel);
  42                 return -ENOMEM;
  43         }
  44
  45         return tegra_drm_register_client(dev->dev_private, drm);
  46 }
  47
  48 static int gr2d_exit(struct host1x_client *client)
  49 {
  50         struct tegra_drm_client *drm = host1x_to_drm_client(client);
  51         struct drm_device *dev = dev_get_drvdata(client->parent);
  52         struct gr2d *gr2d = to_gr2d(drm);
  53         int err;
  54
  55         err = tegra_drm_unregister_client(dev->dev_private, drm);
  56         if (err < 0)
  57                 return err;
  58
  59         host1x_syncpt_free(client->syncpts[0]);
  60         host1x_channel_free(gr2d->channel);
  61
  62         return 0;
  63 }
  64
  65 static const struct host1x_client_ops gr2d_client_ops = {
  66         .init = gr2d_init,
  67         .exit = gr2d_exit,
  68 };
  69
  70 static int gr2d_open_channel(struct tegra_drm_client *client,
  71                              struct tegra_drm_context *context)
  72 {
  73         struct gr2d *gr2d = to_gr2d(client);
  74
  75         context->channel = host1x_channel_get(gr2d->channel);
  76         if (!context->channel)
  77                 return -ENOMEM;
  78
  79         return 0;
  80 }
  81
  82 static void gr2d_close_channel(struct tegra_drm_context *context)
  83 {
  84         host1x_channel_put(context->channel);
  85 }
  86
  87 static int gr2d_is_addr_reg(struct device *dev, u32 class, u32 offset)
  88 {
  89         struct gr2d *gr2d = dev_get_drvdata(dev);
  90
  91         switch (class) {
  92         case HOST1X_CLASS_HOST1X:
  93                 if (offset == 0x2b)
  94                         return 1;
  95
  96                 break;
  97
  98         case HOST1X_CLASS_GR2D:
  99         case HOST1X_CLASS_GR2D_SB:
 100                 if (offset >= GR2D_NUM_REGS)
 101                         break;
 102
 103                 if (test_bit(offset, gr2d->addr_regs))
 104                         return 1;
 105
 106                 break;
 107         }
 108
 109         return 0;
 110 }
 111
 112 static const struct tegra_drm_client_ops gr2d_ops = {
 113         .open_channel = gr2d_open_channel,
 114         .close_channel = gr2d_close_channel,
 115         .is_addr_reg = gr2d_is_addr_reg,
 116         .submit = tegra_drm_submit,
 117 };
 118
 119 static const struct of_device_id gr2d_match[] = {
 120         { .compatible = "nvidia,tegra30-gr2d" },
 121         { .compatible = "nvidia,tegra20-gr2d" },
 122         { },
 123 };
 124 MODULE_DEVICE_TABLE(of, gr2d_match);
 125
 126 static const u32 gr2d_addr_regs[] = {
 127         GR2D_UA_BASE_ADDR,
 128         GR2D_VA_BASE_ADDR,
 129         GR2D_PAT_BASE_ADDR,
 130         GR2D_DSTA_BASE_ADDR,
 131         GR2D_DSTB_BASE_ADDR,
 132         GR2D_DSTC_BASE_ADDR,
 133         GR2D_SRCA_BASE_ADDR,
 134         GR2D_SRCB_BASE_ADDR,
 135         GR2D_SRC_BASE_ADDR_SB,
 136         GR2D_DSTA_BASE_ADDR_SB,
 137         GR2D_DSTB_BASE_ADDR_SB,
 138         GR2D_UA_BASE_ADDR_SB,
 139         GR2D_VA_BASE_ADDR_SB,
 140 };
 141
 142 static int gr2d_probe(struct platform_device *pdev)
 143 {
 144         struct device *dev = &pdev->dev;
 145         struct host1x_syncpt **syncpts;
 146         struct gr2d *gr2d;
 147         unsigned int i;
 148         int err;
 149
 150         gr2d = devm_kzalloc(dev, sizeof(*gr2d), GFP_KERNEL);
 151         if (!gr2d)
 152                 return -ENOMEM;
 153
 154         syncpts = devm_kzalloc(dev, sizeof(*syncpts), GFP_KERNEL);
 155         if (!syncpts)
 156                 return -ENOMEM;
 157
 158         gr2d->clk = devm_clk_get(dev, NULL);
 159         if (IS_ERR(gr2d->clk)) {
 160                 dev_err(dev, "cannot get clock\n");
 161                 return PTR_ERR(gr2d->clk);
 162         }
 163
 164         err = clk_prepare_enable(gr2d->clk);
 165         if (err) {
 166                 dev_err(dev, "cannot turn on clock\n");
 167                 return err;
 168         }
 169
 170         INIT_LIST_HEAD(&gr2d->client.base.list);
 171         gr2d->client.base.ops = &gr2d_client_ops;
 172         gr2d->client.base.dev = dev;
 173         gr2d->client.base.class = HOST1X_CLASS_GR2D;
 174         gr2d->client.base.syncpts = syncpts;
 175         gr2d->client.base.num_syncpts = 1;
 176
 177         INIT_LIST_HEAD(&gr2d->client.list);
 178         gr2d->client.ops = &gr2d_ops;
 179
 180         err = host1x_client_register(&gr2d->client.base);
 181         if (err < 0) {
 182                 dev_err(dev, "failed to register host1x client: %d\n", err);
 183                 clk_disable_unprepare(gr2d->clk);
 184                 return err;
 185         }
 186
 187         /* initialize address register map */
 188         for (i = 0; i < ARRAY_SIZE(gr2d_addr_regs); i++)
 189                 set_bit(gr2d_addr_regs[i], gr2d->addr_regs);
 190
 191         platform_set_drvdata(pdev, gr2d);
 192
 193         return 0;
 194 }
 195
 196 static int gr2d_remove(struct platform_device *pdev)
 197 {
 198         struct gr2d *gr2d = platform_get_drvdata(pdev);
 199         int err;
 200
 201         err = host1x_client_unregister(&gr2d->client.base);
 202         if (err < 0) {
 203                 dev_err(&pdev->dev, "failed to unregister host1x client: %d\n",
 204                         err);
 205                 return err;
 206         }
 207
 208         clk_disable_unprepare(gr2d->clk);
 209
 210         return 0;
 211 }
 212
 213 struct platform_driver tegra_gr2d_driver = {
 214         .driver = {
 215                 .name = "tegra-gr2d",
 216                 .of_match_table = gr2d_match,
 217         },
 218         .probe = gr2d_probe,
 219         .remove = gr2d_remove,
 220 };