gpu: host1x: Add channel support

Add support for host1x client modules, and host1x channels to submit
work to the clients.

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, 100 insertions, 0 deletions

diff --git a/drivers/gpu/host1x/cdma.h b/drivers/gpu/host1x/cdma.h
new file mode 100644
index 000000000000..313c4b784348
--- /dev/null
+++ b/drivers/gpu/host1x/cdma.h
@@ -0,0 +1,100 @@
+/*
+ * Tegra host1x Command DMA
+ *
+ * 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/>.
+ */
+
+#ifndef __HOST1X_CDMA_H
+#define __HOST1X_CDMA_H
+
+#include <linux/sched.h>
+#include <linux/semaphore.h>
+#include <linux/list.h>
+
+struct host1x_syncpt;
+struct host1x_userctx_timeout;
+struct host1x_job;
+
+/*
+ * cdma
+ *
+ * This is in charge of a host command DMA channel.
+ * Sends ops to a push buffer, and takes responsibility for unpinning
+ * (& possibly freeing) of memory after those ops have completed.
+ * Producer:
+ *      begin
+ *              push - send ops to the push buffer
+ *      end - start command DMA and enqueue handles to be unpinned
+ * Consumer:
+ *      update - call to update sync queue and push buffer, unpin memory
+ */
+
+struct push_buffer {
+        u32 *mapped;                    /* mapped pushbuffer memory */
+        dma_addr_t phys;                /* physical address of pushbuffer */
+        u32 fence;                      /* index we've written */
+        u32 pos;                        /* index to write to */
+        u32 size_bytes;
+};
+
+struct buffer_timeout {
+        struct delayed_work wq;         /* work queue */
+        bool initialized;               /* timer one-time setup flag */
+        struct host1x_syncpt *syncpt;   /* buffer completion syncpt */
+        u32 syncpt_val;                 /* syncpt value when completed */
+        ktime_t start_ktime;            /* starting time */
+        /* context timeout information */
+        int client;
+};
+
+enum cdma_event {
+        CDMA_EVENT_NONE,                /* not waiting for any event */
+        CDMA_EVENT_SYNC_QUEUE_EMPTY,    /* wait for empty sync queue */
+        CDMA_EVENT_PUSH_BUFFER_SPACE    /* wait for space in push buffer */
+};
+
+struct host1x_cdma {
+        struct mutex lock;              /* controls access to shared state */
+        struct semaphore sem;           /* signalled when event occurs */
+        enum cdma_event event;          /* event that sem is waiting for */
+        unsigned int slots_used;        /* pb slots used in current submit */
+        unsigned int slots_free;        /* pb slots free in current submit */
+        unsigned int first_get;         /* DMAGET value, where submit begins */
+        unsigned int last_pos;          /* last value written to DMAPUT */
+        struct push_buffer push_buffer; /* channel's push buffer */
+        struct list_head sync_queue;    /* job queue */
+        struct buffer_timeout timeout;  /* channel's timeout state/wq */
+        bool running;
+        bool torndown;
+};
+
+#define cdma_to_channel(cdma) container_of(cdma, struct host1x_channel, cdma)
+#define cdma_to_host1x(cdma) dev_get_drvdata(cdma_to_channel(cdma)->dev->parent)
+#define pb_to_cdma(pb) container_of(pb, struct host1x_cdma, push_buffer)
+
+int host1x_cdma_init(struct host1x_cdma *cdma);
+int host1x_cdma_deinit(struct host1x_cdma *cdma);
+void host1x_cdma_stop(struct host1x_cdma *cdma);
+int host1x_cdma_begin(struct host1x_cdma *cdma, struct host1x_job *job);
+void host1x_cdma_push(struct host1x_cdma *cdma, u32 op1, u32 op2);
+void host1x_cdma_end(struct host1x_cdma *cdma, struct host1x_job *job);
+void host1x_cdma_update(struct host1x_cdma *cdma);
+void host1x_cdma_peek(struct host1x_cdma *cdma, u32 dmaget, int slot,
+                      u32 *out);
+unsigned int host1x_cdma_wait_locked(struct host1x_cdma *cdma,
+                                     enum cdma_event event);
+void host1x_cdma_update_sync_queue(struct host1x_cdma *cdma,
+                                   struct device *dev);
+#endif