gpu: host1x: Add host1x driver

Add host1x, the driver for host1x and its client unit 2D. The Tegra
host1x module is the DMA engine for register access to Tegra's
graphics- and multimedia-related modules. The modules served by
host1x are referred to as clients. host1x includes some other
functionality, such as synchronization.

Signed-off-by: Arto Merilainen <amerilainen@nvidia.com>
Signed-off-by: Terje Bergstrom <tbergstrom@nvidia.com>
Reviewed-by: Thierry Reding <thierry.reding@avionic-design.de>
Tested-by: Thierry Reding <thierry.reding@avionic-design.de>
Tested-by: Erik Faye-Lund <kusmabite@gmail.com>
Signed-off-by: Thierry Reding <thierry.reding@avionic-design.de>

1 files changed, 212 insertions, 0 deletions

diff --git a/drivers/gpu/host1x/syncpt.c b/drivers/gpu/host1x/syncpt.c
new file mode 100644
index 000000000000..30385f62daee
--- /dev/null
+++ b/drivers/gpu/host1x/syncpt.c
@@ -0,0 +1,212 @@
+/*
+ * Tegra host1x Syncpoints
+ *
+ * Copyright (c) 2010-2013, 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/module.h>
+#include <linux/device.h>
+#include <linux/slab.h>
+
+#include <trace/events/host1x.h>
+
+#include "syncpt.h"
+#include "dev.h"
+
+static struct host1x_syncpt *_host1x_syncpt_alloc(struct host1x *host,
+                                                  struct device *dev,
+                                                  int client_managed)
+{
+        int i;
+        struct host1x_syncpt *sp = host->syncpt;
+        char *name;
+
+        for (i = 0; i < host->info->nb_pts && sp->name; i++, sp++)
+                ;
+        if (sp->dev)
+                return NULL;
+
+        name = kasprintf(GFP_KERNEL, "%02d-%s", sp->id,
+                        dev ? dev_name(dev) : NULL);
+        if (!name)
+                return NULL;
+
+        sp->dev = dev;
+        sp->name = name;
+        sp->client_managed = client_managed;
+
+        return sp;
+}
+
+u32 host1x_syncpt_id(struct host1x_syncpt *sp)
+{
+        return sp->id;
+}
+
+/*
+ * Updates the value sent to hardware.
+ */
+u32 host1x_syncpt_incr_max(struct host1x_syncpt *sp, u32 incrs)
+{
+        return (u32)atomic_add_return(incrs, &sp->max_val);
+}
+
+ /*
+ * Write cached syncpoint and waitbase values to hardware.
+ */
+void host1x_syncpt_restore(struct host1x *host)
+{
+        struct host1x_syncpt *sp_base = host->syncpt;
+        u32 i;
+
+        for (i = 0; i < host1x_syncpt_nb_pts(host); i++)
+                host1x_hw_syncpt_restore(host, sp_base + i);
+        for (i = 0; i < host1x_syncpt_nb_bases(host); i++)
+                host1x_hw_syncpt_restore_wait_base(host, sp_base + i);
+        wmb();
+}
+
+/*
+ * Update the cached syncpoint and waitbase values by reading them
+ * from the registers.
+  */
+void host1x_syncpt_save(struct host1x *host)
+{
+        struct host1x_syncpt *sp_base = host->syncpt;
+        u32 i;
+
+        for (i = 0; i < host1x_syncpt_nb_pts(host); i++) {
+                if (host1x_syncpt_client_managed(sp_base + i))
+                        host1x_hw_syncpt_load(host, sp_base + i);
+                else
+                        WARN_ON(!host1x_syncpt_idle(sp_base + i));
+        }
+
+        for (i = 0; i < host1x_syncpt_nb_bases(host); i++)
+                host1x_hw_syncpt_load_wait_base(host, sp_base + i);
+}
+
+/*
+ * Updates the cached syncpoint value by reading a new value from the hardware
+ * register
+ */
+u32 host1x_syncpt_load(struct host1x_syncpt *sp)
+{
+        u32 val;
+        val = host1x_hw_syncpt_load(sp->host, sp);
+        trace_host1x_syncpt_load_min(sp->id, val);
+
+        return val;
+}
+
+/*
+ * Get the current syncpoint base
+ */
+u32 host1x_syncpt_load_wait_base(struct host1x_syncpt *sp)
+{
+        u32 val;
+        host1x_hw_syncpt_load_wait_base(sp->host, sp);
+        val = sp->base_val;
+        return val;
+}
+
+/*
+ * Write a cpu syncpoint increment to the hardware, without touching
+ * the cache. Caller is responsible for host being powered.
+ */
+void host1x_syncpt_cpu_incr(struct host1x_syncpt *sp)
+{
+        host1x_hw_syncpt_cpu_incr(sp->host, sp);
+}
+
+/*
+ * Increment syncpoint value from cpu, updating cache
+ */
+void host1x_syncpt_incr(struct host1x_syncpt *sp)
+{
+        if (host1x_syncpt_client_managed(sp))
+                host1x_syncpt_incr_max(sp, 1);
+        host1x_syncpt_cpu_incr(sp);
+}
+
+int host1x_syncpt_init(struct host1x *host)
+{
+        struct host1x_syncpt *syncpt;
+        int i;
+
+        syncpt = devm_kzalloc(host->dev, sizeof(*syncpt) * host->info->nb_pts,
+                GFP_KERNEL);
+        if (!syncpt)
+                return -ENOMEM;
+
+        for (i = 0; i < host->info->nb_pts; ++i) {
+                syncpt[i].id = i;
+                syncpt[i].host = host;
+        }
+
+        host->syncpt = syncpt;
+
+        host1x_syncpt_restore(host);
+
+        return 0;
+}
+
+struct host1x_syncpt *host1x_syncpt_request(struct device *dev,
+                                            int client_managed)
+{
+        struct host1x *host = dev_get_drvdata(dev->parent);
+        return _host1x_syncpt_alloc(host, dev, client_managed);
+}
+
+void host1x_syncpt_free(struct host1x_syncpt *sp)
+{
+        if (!sp)
+                return;
+
+        kfree(sp->name);
+        sp->dev = NULL;
+        sp->name = NULL;
+        sp->client_managed = 0;
+}
+
+void host1x_syncpt_deinit(struct host1x *host)
+{
+        int i;
+        struct host1x_syncpt *sp = host->syncpt;
+        for (i = 0; i < host->info->nb_pts; i++, sp++)
+                kfree(sp->name);
+}
+
+int host1x_syncpt_nb_pts(struct host1x *host)
+{
+        return host->info->nb_pts;
+}
+
+int host1x_syncpt_nb_bases(struct host1x *host)
+{
+        return host->info->nb_bases;
+}
+
+int host1x_syncpt_nb_mlocks(struct host1x *host)
+{
+        return host->info->nb_mlocks;
+}
+
+struct host1x_syncpt *host1x_syncpt_get(struct host1x *host, u32 id)
+{
+        if (host->info->nb_pts < id)
+                return NULL;
+        return host->syncpt + id;
+}