drm/tegra: Move driver to DRM tree

In order to make subsystem-wide changes easier, move the Tegra DRM
driver back into the DRM tree.

Signed-off-by: Thierry Reding <treding@nvidia.com>

1 files changed, 343 insertions, 0 deletions

diff --git a/drivers/gpu/drm/tegra/gr2d.c b/drivers/gpu/drm/tegra/gr2d.c
new file mode 100644
index 000000000000..4e407e30da1c
--- /dev/null
+++ b/drivers/gpu/drm/tegra/gr2d.c
@@ -0,0 +1,343 @@
+/*
+ * Copyright (c) 2012-2013, NVIDIA Corporation.
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms and conditions of the GNU General Public License,
+ * version 2, as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
+ * more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include <linux/clk.h>
+
+#include "drm.h"
+#include "gem.h"
+
+#define GR2D_NUM_REGS 0x4d
+
+struct gr2d {
+        struct tegra_drm_client client;
+        struct host1x_channel *channel;
+        struct clk *clk;
+
+        DECLARE_BITMAP(addr_regs, GR2D_NUM_REGS);
+};
+
+static inline struct gr2d *to_gr2d(struct tegra_drm_client *client)
+{
+        return container_of(client, struct gr2d, client);
+}
+
+static int gr2d_init(struct host1x_client *client)
+{
+        struct tegra_drm_client *drm = host1x_to_drm_client(client);
+        struct tegra_drm *tegra = dev_get_drvdata(client->parent);
+        struct gr2d *gr2d = to_gr2d(drm);
+
+        gr2d->channel = host1x_channel_request(client->dev);
+        if (!gr2d->channel)
+                return -ENOMEM;
+
+        client->syncpts[0] = host1x_syncpt_request(client->dev, false);
+        if (!client->syncpts[0]) {
+                host1x_channel_free(gr2d->channel);
+                return -ENOMEM;
+        }
+
+        return tegra_drm_register_client(tegra, drm);
+}
+
+static int gr2d_exit(struct host1x_client *client)
+{
+        struct tegra_drm_client *drm = host1x_to_drm_client(client);
+        struct tegra_drm *tegra = dev_get_drvdata(client->parent);
+        struct gr2d *gr2d = to_gr2d(drm);
+        int err;
+
+        err = tegra_drm_unregister_client(tegra, drm);
+        if (err < 0)
+                return err;
+
+        host1x_syncpt_free(client->syncpts[0]);
+        host1x_channel_free(gr2d->channel);
+
+        return 0;
+}
+
+static const struct host1x_client_ops gr2d_client_ops = {
+        .init = gr2d_init,
+        .exit = gr2d_exit,
+};
+
+static int gr2d_open_channel(struct tegra_drm_client *client,
+                             struct tegra_drm_context *context)
+{
+        struct gr2d *gr2d = to_gr2d(client);
+
+        context->channel = host1x_channel_get(gr2d->channel);
+        if (!context->channel)
+                return -ENOMEM;
+
+        return 0;
+}
+
+static void gr2d_close_channel(struct tegra_drm_context *context)
+{
+        host1x_channel_put(context->channel);
+}
+
+static struct host1x_bo *host1x_bo_lookup(struct drm_device *drm,
+                                          struct drm_file *file,
+                                          u32 handle)
+{
+        struct drm_gem_object *gem;
+        struct tegra_bo *bo;
+
+        gem = drm_gem_object_lookup(drm, file, handle);
+        if (!gem)
+                return NULL;
+
+        mutex_lock(&drm->struct_mutex);
+        drm_gem_object_unreference(gem);
+        mutex_unlock(&drm->struct_mutex);
+
+        bo = to_tegra_bo(gem);
+        return &bo->base;
+}
+
+static int gr2d_is_addr_reg(struct device *dev, u32 class, u32 offset)
+{
+        struct gr2d *gr2d = dev_get_drvdata(dev);
+
+        switch (class) {
+        case HOST1X_CLASS_HOST1X:
+                if (offset == 0x2b)
+                        return 1;
+
+                break;
+
+        case HOST1X_CLASS_GR2D:
+        case HOST1X_CLASS_GR2D_SB:
+                if (offset >= GR2D_NUM_REGS)
+                        break;
+
+                if (test_bit(offset, gr2d->addr_regs))
+                        return 1;
+
+                break;
+        }
+
+        return 0;
+}
+
+static int gr2d_submit(struct tegra_drm_context *context,
+                       struct drm_tegra_submit *args, struct drm_device *drm,
+                       struct drm_file *file)
+{
+        unsigned int num_cmdbufs = args->num_cmdbufs;
+        unsigned int num_relocs = args->num_relocs;
+        unsigned int num_waitchks = args->num_waitchks;
+        struct drm_tegra_cmdbuf __user *cmdbufs =
+                (void * __user)(uintptr_t)args->cmdbufs;
+        struct drm_tegra_reloc __user *relocs =
+                (void * __user)(uintptr_t)args->relocs;
+        struct drm_tegra_waitchk __user *waitchks =
+                (void * __user)(uintptr_t)args->waitchks;
+        struct drm_tegra_syncpt syncpt;
+        struct host1x_job *job;
+        int err;
+
+        /* We don't yet support other than one syncpt_incr struct per submit */
+        if (args->num_syncpts != 1)
+                return -EINVAL;
+
+        job = host1x_job_alloc(context->channel, args->num_cmdbufs,
+                               args->num_relocs, args->num_waitchks);
+        if (!job)
+                return -ENOMEM;
+
+        job->num_relocs = args->num_relocs;
+        job->num_waitchk = args->num_waitchks;
+        job->client = (u32)args->context;
+        job->class = context->client->base.class;
+        job->serialize = true;
+
+        while (num_cmdbufs) {
+                struct drm_tegra_cmdbuf cmdbuf;
+                struct host1x_bo *bo;
+
+                err = copy_from_user(&cmdbuf, cmdbufs, sizeof(cmdbuf));
+                if (err)
+                        goto fail;
+
+                bo = host1x_bo_lookup(drm, file, cmdbuf.handle);
+                if (!bo) {
+                        err = -ENOENT;
+                        goto fail;
+                }
+
+                host1x_job_add_gather(job, bo, cmdbuf.words, cmdbuf.offset);
+                num_cmdbufs--;
+                cmdbufs++;
+        }
+
+        err = copy_from_user(job->relocarray, relocs,
+                             sizeof(*relocs) * num_relocs);
+        if (err)
+                goto fail;
+
+        while (num_relocs--) {
+                struct host1x_reloc *reloc = &job->relocarray[num_relocs];
+                struct host1x_bo *cmdbuf, *target;
+
+                cmdbuf = host1x_bo_lookup(drm, file, (u32)reloc->cmdbuf);
+                target = host1x_bo_lookup(drm, file, (u32)reloc->target);
+
+                reloc->cmdbuf = cmdbuf;
+                reloc->target = target;
+
+                if (!reloc->target || !reloc->cmdbuf) {
+                        err = -ENOENT;
+                        goto fail;
+                }
+        }
+
+        err = copy_from_user(job->waitchk, waitchks,
+                             sizeof(*waitchks) * num_waitchks);
+        if (err)
+                goto fail;
+
+        err = copy_from_user(&syncpt, (void * __user)(uintptr_t)args->syncpts,
+                             sizeof(syncpt));
+        if (err)
+                goto fail;
+
+        job->syncpt_id = syncpt.id;
+        job->syncpt_incrs = syncpt.incrs;
+        job->timeout = 10000;
+        job->is_addr_reg = gr2d_is_addr_reg;
+
+        if (args->timeout && args->timeout < 10000)
+                job->timeout = args->timeout;
+
+        err = host1x_job_pin(job, context->client->base.dev);
+        if (err)
+                goto fail;
+
+        err = host1x_job_submit(job);
+        if (err)
+                goto fail_submit;
+
+        args->fence = job->syncpt_end;
+
+        host1x_job_put(job);
+        return 0;
+
+fail_submit:
+        host1x_job_unpin(job);
+fail:
+        host1x_job_put(job);
+        return err;
+}
+
+static const struct tegra_drm_client_ops gr2d_ops = {
+        .open_channel = gr2d_open_channel,
+        .close_channel = gr2d_close_channel,
+        .submit = gr2d_submit,
+};
+
+static const struct of_device_id gr2d_match[] = {
+        { .compatible = "nvidia,tegra30-gr2d" },
+        { .compatible = "nvidia,tegra20-gr2d" },
+        { },
+};
+
+static const u32 gr2d_addr_regs[] = {
+        0x1a, 0x1b, 0x26, 0x2b, 0x2c, 0x2d, 0x31, 0x32,
+        0x48, 0x49, 0x4a, 0x4b, 0x4c
+};
+
+static int gr2d_probe(struct platform_device *pdev)
+{
+        struct device *dev = &pdev->dev;
+        struct host1x_syncpt **syncpts;
+        struct gr2d *gr2d;
+        unsigned int i;
+        int err;
+
+        gr2d = devm_kzalloc(dev, sizeof(*gr2d), GFP_KERNEL);
+        if (!gr2d)
+                return -ENOMEM;
+
+        syncpts = devm_kzalloc(dev, sizeof(*syncpts), GFP_KERNEL);
+        if (!syncpts)
+                return -ENOMEM;
+
+        gr2d->clk = devm_clk_get(dev, NULL);
+        if (IS_ERR(gr2d->clk)) {
+                dev_err(dev, "cannot get clock\n");
+                return PTR_ERR(gr2d->clk);
+        }
+
+        err = clk_prepare_enable(gr2d->clk);
+        if (err) {
+                dev_err(dev, "cannot turn on clock\n");
+                return err;
+        }
+
+        INIT_LIST_HEAD(&gr2d->client.base.list);
+        gr2d->client.base.ops = &gr2d_client_ops;
+        gr2d->client.base.dev = dev;
+        gr2d->client.base.class = HOST1X_CLASS_GR2D;
+        gr2d->client.base.syncpts = syncpts;
+        gr2d->client.base.num_syncpts = 1;
+
+        INIT_LIST_HEAD(&gr2d->client.list);
+        gr2d->client.ops = &gr2d_ops;
+
+        err = host1x_client_register(&gr2d->client.base);
+        if (err < 0) {
+                dev_err(dev, "failed to register host1x client: %d\n", err);
+                return err;
+        }
+
+        /* initialize address register map */
+        for (i = 0; i < ARRAY_SIZE(gr2d_addr_regs); i++)
+                set_bit(gr2d_addr_regs[i], gr2d->addr_regs);
+
+        platform_set_drvdata(pdev, gr2d);
+
+        return 0;
+}
+
+static int gr2d_remove(struct platform_device *pdev)
+{
+        struct gr2d *gr2d = platform_get_drvdata(pdev);
+        int err;
+
+        err = host1x_client_unregister(&gr2d->client.base);
+        if (err < 0) {
+                dev_err(&pdev->dev, "failed to unregister host1x client: %d\n",
+                        err);
+                return err;
+        }
+
+        clk_disable_unprepare(gr2d->clk);
+
+        return 0;
+}
+
+struct platform_driver tegra_gr2d_driver = {
+        .driver = {
+                .name = "tegra-gr2d",
+                .of_match_table = gr2d_match,
+        },
+        .probe = gr2d_probe,
+        .remove = gr2d_remove,
+};