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Based on 1 normalized pattern(s): 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 extracted by the scancode license scanner the SPDX license identifier GPL-2.0-only has been chosen to replace the boilerplate/reference in 228 file(s). Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Reviewed-by: Allison Randal <allison@lohutok.net> Reviewed-by: Steve Winslow <swinslow@gmail.com> Reviewed-by: Richard Fontana <rfontana@redhat.com> Reviewed-by: Alexios Zavras <alexios.zavras@intel.com> Cc: linux-spdx@vger.kernel.org Link: https://lkml.kernel.org/r/20190528171438.107155473@linutronix.de Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
145 lines
3.3 KiB
C
145 lines
3.3 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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/*
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* Tegra host1x Syncpoints
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*
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* Copyright (c) 2010-2013, NVIDIA Corporation.
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*/
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#include <linux/io.h>
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#include "../dev.h"
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#include "../syncpt.h"
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/*
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* Write the current syncpoint value back to hw.
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*/
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static void syncpt_restore(struct host1x_syncpt *sp)
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{
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u32 min = host1x_syncpt_read_min(sp);
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struct host1x *host = sp->host;
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host1x_sync_writel(host, min, HOST1X_SYNC_SYNCPT(sp->id));
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}
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/*
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* Write the current waitbase value back to hw.
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*/
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static void syncpt_restore_wait_base(struct host1x_syncpt *sp)
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{
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#if HOST1X_HW < 7
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struct host1x *host = sp->host;
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host1x_sync_writel(host, sp->base_val,
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HOST1X_SYNC_SYNCPT_BASE(sp->id));
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#endif
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}
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/*
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* Read waitbase value from hw.
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*/
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static void syncpt_read_wait_base(struct host1x_syncpt *sp)
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{
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#if HOST1X_HW < 7
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struct host1x *host = sp->host;
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sp->base_val =
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host1x_sync_readl(host, HOST1X_SYNC_SYNCPT_BASE(sp->id));
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#endif
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}
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/*
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* Updates the last value read from hardware.
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*/
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static u32 syncpt_load(struct host1x_syncpt *sp)
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{
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struct host1x *host = sp->host;
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u32 old, live;
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/* Loop in case there's a race writing to min_val */
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do {
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old = host1x_syncpt_read_min(sp);
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live = host1x_sync_readl(host, HOST1X_SYNC_SYNCPT(sp->id));
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} while ((u32)atomic_cmpxchg(&sp->min_val, old, live) != old);
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if (!host1x_syncpt_check_max(sp, live))
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dev_err(host->dev, "%s failed: id=%u, min=%d, max=%d\n",
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__func__, sp->id, host1x_syncpt_read_min(sp),
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host1x_syncpt_read_max(sp));
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return live;
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}
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/*
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* Write a cpu syncpoint increment to the hardware, without touching
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* the cache.
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*/
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static int syncpt_cpu_incr(struct host1x_syncpt *sp)
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{
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struct host1x *host = sp->host;
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u32 reg_offset = sp->id / 32;
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if (!host1x_syncpt_client_managed(sp) &&
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host1x_syncpt_idle(sp))
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return -EINVAL;
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host1x_sync_writel(host, BIT(sp->id % 32),
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HOST1X_SYNC_SYNCPT_CPU_INCR(reg_offset));
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wmb();
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return 0;
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}
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/**
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* syncpt_assign_to_channel() - Assign syncpoint to channel
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* @sp: syncpoint
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* @ch: channel
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*
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* On chips with the syncpoint protection feature (Tegra186+), assign @sp to
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* @ch, preventing other channels from incrementing the syncpoints. If @ch is
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* NULL, unassigns the syncpoint.
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*
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* On older chips, do nothing.
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*/
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static void syncpt_assign_to_channel(struct host1x_syncpt *sp,
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struct host1x_channel *ch)
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{
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#if HOST1X_HW >= 6
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struct host1x *host = sp->host;
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if (!host->hv_regs)
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return;
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host1x_sync_writel(host,
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HOST1X_SYNC_SYNCPT_CH_APP_CH(ch ? ch->id : 0xff),
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HOST1X_SYNC_SYNCPT_CH_APP(sp->id));
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#endif
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}
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/**
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* syncpt_enable_protection() - Enable syncpoint protection
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* @host: host1x instance
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*
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* On chips with the syncpoint protection feature (Tegra186+), enable this
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* feature. On older chips, do nothing.
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*/
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static void syncpt_enable_protection(struct host1x *host)
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{
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#if HOST1X_HW >= 6
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if (!host->hv_regs)
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return;
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host1x_hypervisor_writel(host, HOST1X_HV_SYNCPT_PROT_EN_CH_EN,
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HOST1X_HV_SYNCPT_PROT_EN);
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#endif
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}
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static const struct host1x_syncpt_ops host1x_syncpt_ops = {
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.restore = syncpt_restore,
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.restore_wait_base = syncpt_restore_wait_base,
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.load_wait_base = syncpt_read_wait_base,
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.load = syncpt_load,
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.cpu_incr = syncpt_cpu_incr,
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.assign_to_channel = syncpt_assign_to_channel,
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.enable_protection = syncpt_enable_protection,
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};
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