linux-kernel - Re: [PATCH 1/1] [tegra] Make syncpt routines accessible by drivers

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Message-ID: <AANLkTinvpo=R1pjvykEZVXV08D+uXLJa=R8CDcMFWWpT@mail.gmail.com>
Date:	Mon, 14 Feb 2011 15:40:16 -0800
From:	Erik Gilling <konkers@...roid.com>
To:	achew@...dia.com
Cc:	linux-tegra@...r.kernel.org, linux-kernel@...r.kernel.org,
	ccross@...roid.com, olof@...om.net
Subject: Re: [PATCH 1/1] [tegra] Make syncpt routines accessible by drivers

If you want to use syncpts you should be an nvhost_driver link the dc.

On Mon, Feb 14, 2011 at 3:27 PM,  <achew@...dia.com> wrote:
> From: Andrew Chew <achew@...dia.com>
>
> Make some Tegra syncpt routines accessible by kernel drivers that need
> to use the syncpt mechanism.  This is similar to how some nvmap stuff
> is made accessible to kernel drivers.
>
> Change-Id: Id6cd2800e75223e5da29d6c0764bac5b233be185
> Signed-off-by: Andrew Chew <achew@...dia.com>
> ---
>  arch/arm/mach-tegra/include/mach/nvsyncpt.h |   36 +++++++++++++++++++++++++++
>  drivers/video/tegra/host/dev.c              |    4 +++
>  drivers/video/tegra/host/nvhost_syncpt.c    |    7 +++++
>  drivers/video/tegra/host/nvhost_syncpt.h    |    2 +
>  4 files changed, 49 insertions(+), 0 deletions(-)
>  create mode 100644 arch/arm/mach-tegra/include/mach/nvsyncpt.h
>
> diff --git a/arch/arm/mach-tegra/include/mach/nvsyncpt.h b/arch/arm/mach-tegra/include/mach/nvsyncpt.h
> new file mode 100644
> index 0000000..021d498
> --- /dev/null
> +++ b/arch/arm/mach-tegra/include/mach/nvsyncpt.h
> @@ -0,0 +1,36 @@
> +/*
> + * Tegra host syncpt exports
> + *
> + * Copyright (c) 2009-2010, NVIDIA Corporation.
> + *
> + * This program is free software; you can redistribute it and/or modify
> + * it under the terms of the GNU General Public License as published by
> + * the Free Software Foundation; either version 2 of the License, or
> + * (at your option) any later version.
> + *
> + * This program is distributed in the hope that 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, write to the Free Software Foundation, Inc.,
> + * 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
> + */
> +
> +#ifndef __NVSYNCPT_H
> +#define __NVSYNCPT_H
> +
> +#if defined(__KERNEL__)
> +
> +struct nvhost_syncpt;
> +
> +extern struct nvhost_syncpt *nvhost_getsyncpt(void);
> +extern u32 nvhost_syncpt_read(struct nvhost_syncpt *sp, u32 id);
> +extern int nvhost_syncpt_wait_timeout(struct nvhost_syncpt *sp,
> +                                     u32 id, u32 thresh, u32 timeout);
> +extern void nvhost_syncpt_cpu_incr(struct nvhost_syncpt *sp, u32 id);
> +
> +#endif
> +
> +#endif
> diff --git a/drivers/video/tegra/host/dev.c b/drivers/video/tegra/host/dev.c
> index 20a4eda..af70a41 100644
> --- a/drivers/video/tegra/host/dev.c
> +++ b/drivers/video/tegra/host/dev.c
> @@ -721,6 +721,8 @@ static int __devinit nvhost_probe(struct platform_device *pdev)
>
>        nvhost_debug_init(host);
>
> +       nvhost_syncpt = &host->syncpt;
> +
>        dev_info(&pdev->dev, "initialized\n");
>        return 0;
>
> @@ -734,6 +736,8 @@ fail:
>
>  static int __exit nvhost_remove(struct platform_device *pdev)
>  {
> +       nvhost_syncpt = NULL;
> +
>        return 0;
>  }
>
> diff --git a/drivers/video/tegra/host/nvhost_syncpt.c b/drivers/video/tegra/host/nvhost_syncpt.c
> index dd2ab0d..315050d 100644
> --- a/drivers/video/tegra/host/nvhost_syncpt.c
> +++ b/drivers/video/tegra/host/nvhost_syncpt.c
> @@ -27,6 +27,8 @@
>  #define syncpt_to_dev(sp) container_of(sp, struct nvhost_master, syncpt)
>  #define SYNCPT_CHECK_PERIOD 2*HZ
>
> +struct nvhost_syncpt *nvhost_syncpt;
> +
>  static bool check_max(struct nvhost_syncpt *sp, u32 id, u32 real)
>  {
>        u32 max;
> @@ -254,3 +256,8 @@ void nvhost_syncpt_debug(struct nvhost_syncpt *sp)
>
>        }
>  }
> +
> +struct nvhost_syncpt *nvhost_getsyncpt(void)
> +{
> +       return nvhost_syncpt;
> +}
> diff --git a/drivers/video/tegra/host/nvhost_syncpt.h b/drivers/video/tegra/host/nvhost_syncpt.h
> index f161f20..65f0c95 100644
> --- a/drivers/video/tegra/host/nvhost_syncpt.h
> +++ b/drivers/video/tegra/host/nvhost_syncpt.h
> @@ -72,6 +72,8 @@ struct nvhost_syncpt {
>        u32 base_val[NV_HOST1X_SYNCPT_NB_BASES];
>  };
>
> +extern struct nvhost_syncpt *nvhost_syncpt;
> +
>  /**
>  * Updates the value sent to hardware.
>  */
> --
> 1.7.0.4
>
>
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