Added missing tegra files.HEADmaster

1 files changed, 319 insertions, 0 deletions

diff --git a/drivers/video/tegra/host/nvhost_syncpt.c b/drivers/video/tegra/host/nvhost_syncpt.c
new file mode 100644
index 00000000000..eb5176ea1bf
--- /dev/null
+++ b/drivers/video/tegra/host/nvhost_syncpt.c
@@ -0,0 +1,319 @@
+/*
+ * drivers/video/tegra/host/nvhost_syncpt.c
+ *
+ * Tegra Graphics Host Syncpoints
+ *
+ * Copyright (c) 2010-2012, 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/nvhost_ioctl.h>
+#include <linux/platform_device.h>
+#include "nvhost_syncpt.h"
+#include "dev.h"
+
+#define MAX_STUCK_CHECK_COUNT 15
+
+/**
+ * Resets syncpoint and waitbase values to sw shadows
+ */
+void nvhost_syncpt_reset(struct nvhost_syncpt *sp)
+{
+        u32 i;
+        BUG_ON(!(syncpt_op(sp).reset && syncpt_op(sp).reset_wait_base));
+
+        for (i = 0; i < sp->nb_pts; i++)
+                syncpt_op(sp).reset(sp, i);
+        for (i = 0; i < sp->nb_bases; i++)
+                syncpt_op(sp).reset_wait_base(sp, i);
+        wmb();
+}
+
+/**
+ * Updates sw shadow state for client managed registers
+ */
+void nvhost_syncpt_save(struct nvhost_syncpt *sp)
+{
+        u32 i;
+        BUG_ON(!(syncpt_op(sp).update_min && syncpt_op(sp).read_wait_base));
+
+        for (i = 0; i < sp->nb_pts; i++) {
+                if (client_managed(i))
+                        syncpt_op(sp).update_min(sp, i);
+                else
+                        BUG_ON(!nvhost_syncpt_min_eq_max(sp, i));
+        }
+
+        for (i = 0; i < sp->nb_bases; i++)
+                syncpt_op(sp).read_wait_base(sp, i);
+}
+
+/**
+ * Updates the last value read from hardware.
+ */
+u32 nvhost_syncpt_update_min(struct nvhost_syncpt *sp, u32 id)
+{
+        BUG_ON(!syncpt_op(sp).update_min);
+
+        return syncpt_op(sp).update_min(sp, id);
+}
+
+/**
+ * Get the current syncpoint value
+ */
+u32 nvhost_syncpt_read(struct nvhost_syncpt *sp, u32 id)
+{
+        u32 val;
+        BUG_ON(!syncpt_op(sp).update_min);
+        nvhost_module_busy(syncpt_to_dev(sp)->dev);
+        val = syncpt_op(sp).update_min(sp, id);
+        nvhost_module_idle(syncpt_to_dev(sp)->dev);
+        return val;
+}
+
+/**
+ * Get the current syncpoint base
+ */
+u32 nvhost_syncpt_read_wait_base(struct nvhost_syncpt *sp, u32 id)
+{
+        u32 val;
+        BUG_ON(!syncpt_op(sp).read_wait_base);
+        nvhost_module_busy(syncpt_to_dev(sp)->dev);
+        syncpt_op(sp).read_wait_base(sp, id);
+        val = sp->base_val[id];
+        nvhost_module_idle(syncpt_to_dev(sp)->dev);
+        return val;
+}
+
+/**
+ * Write a cpu syncpoint increment to the hardware, without touching
+ * the cache. Caller is responsible for host being powered.
+ */
+void nvhost_syncpt_cpu_incr(struct nvhost_syncpt *sp, u32 id)
+{
+        BUG_ON(!syncpt_op(sp).cpu_incr);
+        syncpt_op(sp).cpu_incr(sp, id);
+}
+
+/**
+ * Increment syncpoint value from cpu, updating cache
+ */
+void nvhost_syncpt_incr(struct nvhost_syncpt *sp, u32 id)
+{
+        if (client_managed(id))
+                nvhost_syncpt_incr_max(sp, id, 1);
+        nvhost_module_busy(syncpt_to_dev(sp)->dev);
+        nvhost_syncpt_cpu_incr(sp, id);
+        nvhost_module_idle(syncpt_to_dev(sp)->dev);
+}
+
+/**
+ * Main entrypoint for syncpoint value waits.
+ */
+int nvhost_syncpt_wait_timeout(struct nvhost_syncpt *sp, u32 id,
+                        u32 thresh, u32 timeout, u32 *value)
+{
+        DECLARE_WAIT_QUEUE_HEAD_ONSTACK(wq);
+        void *ref;
+        void *waiter;
+        int err = 0, check_count = 0, low_timeout = 0;
+        u32 val;
+
+        if (value)
+                *value = 0;
+
+        /* first check cache */
+        if (nvhost_syncpt_is_expired(sp, id, thresh)) {
+                if (value)
+                        *value = nvhost_syncpt_read_min(sp, id);
+                return 0;
+        }
+
+        /* keep host alive */
+        nvhost_module_busy(syncpt_to_dev(sp)->dev);
+
+        /* try to read from register */
+        val = syncpt_op(sp).update_min(sp, id);
+        if (nvhost_syncpt_is_expired(sp, id, thresh)) {
+                if (value)
+                        *value = val;
+                goto done;
+        }
+
+        if (!timeout) {
+                err = -EAGAIN;
+                goto done;
+        }
+
+        /* schedule a wakeup when the syncpoint value is reached */
+        waiter = nvhost_intr_alloc_waiter();
+        if (!waiter) {
+                err = -ENOMEM;
+                goto done;
+        }
+
+        err = nvhost_intr_add_action(&(syncpt_to_dev(sp)->intr), id, thresh,
+                                NVHOST_INTR_ACTION_WAKEUP_INTERRUPTIBLE, &wq,
+                                waiter,
+                                &ref);
+        if (err)
+                goto done;
+
+        err = -EAGAIN;
+        /* Caller-specified timeout may be impractically low */
+        if (timeout < SYNCPT_CHECK_PERIOD)
+                low_timeout = timeout;
+
+        /* wait for the syncpoint, or timeout, or signal */
+        while (timeout) {
+                u32 check = min_t(u32, SYNCPT_CHECK_PERIOD, timeout);
+                int remain = wait_event_interruptible_timeout(wq,
+                                nvhost_syncpt_is_expired(sp, id, thresh),
+                                check);
+                if (remain > 0) {
+                        if (value)
+                                *value = nvhost_syncpt_read_min(sp, id);
+                        err = 0;
+                        break;
+                }
+                if (remain < 0) {
+                        err = remain;
+                        break;
+                }
+                if (timeout != NVHOST_NO_TIMEOUT)
+                        timeout -= check;
+                if (timeout) {
+                        dev_warn(&syncpt_to_dev(sp)->dev->dev,
+                                "%s: syncpoint id %d (%s) stuck waiting %d, timeout=%d\n",
+                                 current->comm, id, syncpt_op(sp).name(sp, id),
+                                 thresh, timeout);
+                        syncpt_op(sp).debug(sp);
+                        if (check_count > MAX_STUCK_CHECK_COUNT) {
+                                if (low_timeout) {
+                                        dev_warn(&syncpt_to_dev(sp)->dev->dev,
+                                                "is timeout %d too low?\n",
+                                                low_timeout);
+                                }
+                                nvhost_debug_dump(syncpt_to_dev(sp));
+                                BUG();
+                        }
+                        check_count++;
+                }
+        }
+        nvhost_intr_put_ref(&(syncpt_to_dev(sp)->intr), ref);
+
+done:
+        nvhost_module_idle(syncpt_to_dev(sp)->dev);
+        return err;
+}
+
+/**
+ * Returns true if syncpoint is expired, false if we may need to wait
+ */
+bool nvhost_syncpt_is_expired(
+        struct nvhost_syncpt *sp,
+        u32 id,
+        u32 thresh)
+{
+        u32 current_val;
+        u32 future_val;
+        smp_rmb();
+        current_val = (u32)atomic_read(&sp->min_val[id]);
+        future_val = (u32)atomic_read(&sp->max_val[id]);
+
+        /* Note the use of unsigned arithmetic here (mod 1<<32).
+         *
+         * c = current_val = min_val    = the current value of the syncpoint.
+         * t = thresh                   = the value we are checking
+         * f = future_val  = max_val    = the value c will reach when all
+         *                                outstanding increments have completed.
+         *
+         * Note that c always chases f until it reaches f.
+         *
+         * Dtf = (f - t)
+         * Dtc = (c - t)
+         *
+         *  Consider all cases:
+         *
+         *      A) .....c..t..f.....    Dtf < Dtc       need to wait
+         *      B) .....c.....f..t..    Dtf > Dtc       expired
+         *      C) ..t..c.....f.....    Dtf > Dtc       expired    (Dct very large)
+         *
+         *  Any case where f==c: always expired (for any t).    Dtf == Dcf
+         *  Any case where t==c: always expired (for any f).    Dtf >= Dtc (because Dtc==0)
+         *  Any case where t==f!=c: always wait.                Dtf <  Dtc (because Dtf==0,
+         *                                                      Dtc!=0)
+         *
+         *  Other cases:
+         *
+         *      A) .....t..f..c.....    Dtf < Dtc       need to wait
+         *      A) .....f..c..t.....    Dtf < Dtc       need to wait
+         *      A) .....f..t..c.....    Dtf > Dtc       expired
+         *
+         *   So:
+         *         Dtf >= Dtc implies EXPIRED   (return true)
+         *         Dtf <  Dtc implies WAIT      (return false)
+         *
+         * Note: If t is expired then we *cannot* wait on it. We would wait
+         * forever (hang the system).
+         *
+         * Note: do NOT get clever and remove the -thresh from both sides. It
+         * is NOT the same.
+         *
+         * If future valueis zero, we have a client managed sync point. In that
+         * case we do a direct comparison.
+         */
+        if (!client_managed(id))
+                return future_val - thresh >= current_val - thresh;
+        else
+                return (s32)(current_val - thresh) >= 0;
+}
+
+void nvhost_syncpt_debug(struct nvhost_syncpt *sp)
+{
+        syncpt_op(sp).debug(sp);
+}
+
+int nvhost_mutex_try_lock(struct nvhost_syncpt *sp, int idx)
+{
+        struct nvhost_master *host = syncpt_to_dev(sp);
+        u32 reg;
+
+        nvhost_module_busy(host->dev);
+        reg = syncpt_op(sp).mutex_try_lock(sp, idx);
+        if (reg) {
+                nvhost_module_idle(host->dev);
+                return -EBUSY;
+        }
+        atomic_inc(&sp->lock_counts[idx]);
+        return 0;
+}
+
+void nvhost_mutex_unlock(struct nvhost_syncpt *sp, int idx)
+{
+        syncpt_op(sp).mutex_unlock(sp, idx);
+        nvhost_module_idle(syncpt_to_dev(sp)->dev);
+        atomic_dec(&sp->lock_counts[idx]);
+}
+
+/* check for old WAITs to be removed (avoiding a wrap) */
+int nvhost_syncpt_wait_check(struct nvhost_syncpt *sp,
+                             struct nvmap_client *nvmap,
+                             u32 waitchk_mask,
+                             struct nvhost_waitchk *wait,
+                             int num_waitchk)
+{
+        return syncpt_op(sp).wait_check(sp, nvmap,
+                        waitchk_mask, wait, num_waitchk);
+}