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Linux/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         unsigned long flags = HOST1X_SYNCPT_HAS_BASE;
 41         struct gr2d *gr2d = to_gr2d(drm);
 42 
 43         gr2d->channel = host1x_channel_request(client->dev);
 44         if (!gr2d->channel)
 45                 return -ENOMEM;
 46 
 47         client->syncpts[0] = host1x_syncpt_request(client->dev, flags);
 48         if (!client->syncpts[0]) {
 49                 host1x_channel_free(gr2d->channel);
 50                 return -ENOMEM;
 51         }
 52 
 53         return tegra_drm_register_client(tegra, drm);
 54 }
 55 
 56 static int gr2d_exit(struct host1x_client *client)
 57 {
 58         struct tegra_drm_client *drm = host1x_to_drm_client(client);
 59         struct tegra_drm *tegra = dev_get_drvdata(client->parent);
 60         struct gr2d *gr2d = to_gr2d(drm);
 61         int err;
 62 
 63         err = tegra_drm_unregister_client(tegra, drm);
 64         if (err < 0)
 65                 return err;
 66 
 67         host1x_syncpt_free(client->syncpts[0]);
 68         host1x_channel_free(gr2d->channel);
 69 
 70         return 0;
 71 }
 72 
 73 static const struct host1x_client_ops gr2d_client_ops = {
 74         .init = gr2d_init,
 75         .exit = gr2d_exit,
 76 };
 77 
 78 static int gr2d_open_channel(struct tegra_drm_client *client,
 79                              struct tegra_drm_context *context)
 80 {
 81         struct gr2d *gr2d = to_gr2d(client);
 82 
 83         context->channel = host1x_channel_get(gr2d->channel);
 84         if (!context->channel)
 85                 return -ENOMEM;
 86 
 87         return 0;
 88 }
 89 
 90 static void gr2d_close_channel(struct tegra_drm_context *context)
 91 {
 92         host1x_channel_put(context->channel);
 93 }
 94 
 95 static int gr2d_is_addr_reg(struct device *dev, u32 class, u32 offset)
 96 {
 97         struct gr2d *gr2d = dev_get_drvdata(dev);
 98 
 99         switch (class) {
100         case HOST1X_CLASS_HOST1X:
101                 if (offset == 0x2b)
102                         return 1;
103 
104                 break;
105 
106         case HOST1X_CLASS_GR2D:
107         case HOST1X_CLASS_GR2D_SB:
108                 if (offset >= GR2D_NUM_REGS)
109                         break;
110 
111                 if (test_bit(offset, gr2d->addr_regs))
112                         return 1;
113 
114                 break;
115         }
116 
117         return 0;
118 }
119 
120 static const struct tegra_drm_client_ops gr2d_ops = {
121         .open_channel = gr2d_open_channel,
122         .close_channel = gr2d_close_channel,
123         .is_addr_reg = gr2d_is_addr_reg,
124         .submit = tegra_drm_submit,
125 };
126 
127 static const struct of_device_id gr2d_match[] = {
128         { .compatible = "nvidia,tegra30-gr2d" },
129         { .compatible = "nvidia,tegra20-gr2d" },
130         { },
131 };
132 
133 static const u32 gr2d_addr_regs[] = {
134         GR2D_UA_BASE_ADDR,
135         GR2D_VA_BASE_ADDR,
136         GR2D_PAT_BASE_ADDR,
137         GR2D_DSTA_BASE_ADDR,
138         GR2D_DSTB_BASE_ADDR,
139         GR2D_DSTC_BASE_ADDR,
140         GR2D_SRCA_BASE_ADDR,
141         GR2D_SRCB_BASE_ADDR,
142         GR2D_SRC_BASE_ADDR_SB,
143         GR2D_DSTA_BASE_ADDR_SB,
144         GR2D_DSTB_BASE_ADDR_SB,
145         GR2D_UA_BASE_ADDR_SB,
146         GR2D_VA_BASE_ADDR_SB,
147 };
148 
149 static int gr2d_probe(struct platform_device *pdev)
150 {
151         struct device *dev = &pdev->dev;
152         struct host1x_syncpt **syncpts;
153         struct gr2d *gr2d;
154         unsigned int i;
155         int err;
156 
157         gr2d = devm_kzalloc(dev, sizeof(*gr2d), GFP_KERNEL);
158         if (!gr2d)
159                 return -ENOMEM;
160 
161         syncpts = devm_kzalloc(dev, sizeof(*syncpts), GFP_KERNEL);
162         if (!syncpts)
163                 return -ENOMEM;
164 
165         gr2d->clk = devm_clk_get(dev, NULL);
166         if (IS_ERR(gr2d->clk)) {
167                 dev_err(dev, "cannot get clock\n");
168                 return PTR_ERR(gr2d->clk);
169         }
170 
171         err = clk_prepare_enable(gr2d->clk);
172         if (err) {
173                 dev_err(dev, "cannot turn on clock\n");
174                 return err;
175         }
176 
177         INIT_LIST_HEAD(&gr2d->client.base.list);
178         gr2d->client.base.ops = &gr2d_client_ops;
179         gr2d->client.base.dev = dev;
180         gr2d->client.base.class = HOST1X_CLASS_GR2D;
181         gr2d->client.base.syncpts = syncpts;
182         gr2d->client.base.num_syncpts = 1;
183 
184         INIT_LIST_HEAD(&gr2d->client.list);
185         gr2d->client.ops = &gr2d_ops;
186 
187         err = host1x_client_register(&gr2d->client.base);
188         if (err < 0) {
189                 dev_err(dev, "failed to register host1x client: %d\n", err);
190                 clk_disable_unprepare(gr2d->clk);
191                 return err;
192         }
193 
194         /* initialize address register map */
195         for (i = 0; i < ARRAY_SIZE(gr2d_addr_regs); i++)
196                 set_bit(gr2d_addr_regs[i], gr2d->addr_regs);
197 
198         platform_set_drvdata(pdev, gr2d);
199 
200         return 0;
201 }
202 
203 static int gr2d_remove(struct platform_device *pdev)
204 {
205         struct gr2d *gr2d = platform_get_drvdata(pdev);
206         int err;
207 
208         err = host1x_client_unregister(&gr2d->client.base);
209         if (err < 0) {
210                 dev_err(&pdev->dev, "failed to unregister host1x client: %d\n",
211                         err);
212                 return err;
213         }
214 
215         clk_disable_unprepare(gr2d->clk);
216 
217         return 0;
218 }
219 
220 struct platform_driver tegra_gr2d_driver = {
221         .driver = {
222                 .name = "tegra-gr2d",
223                 .of_match_table = gr2d_match,
224         },
225         .probe = gr2d_probe,
226         .remove = gr2d_remove,
227 };
228 

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