linux-kernel - Re: [PATCH V2] ARM: imx: introduce imx_l2c310_write

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Message-ID: <CAOFm3uGL=zyxj5VzKAKsAcU6bcL2bJQCcvP9eg4qYAKN00iwJg@mail.gmail.com>
Date:   Sat, 30 Dec 2017 15:16:47 +0100
From:   Philippe Ombredanne <pombredanne@...b.com>
To:     Peng Fan <peng.fan@....com>
Cc:     Shawn Guo <shawnguo@...nel.org>,
        "moderated list:ARM/FREESCALE IMX / MXC ARM ARCHITECTURE" 
        <linux-arm-kernel@...ts.infradead.org>,
        LKML <linux-kernel@...r.kernel.org>,
        Peng Fan <van.freenix@...il.com>,
        Sascha Hauer <kernel@...gutronix.de>,
        Fabio Estevam <fabio.estevam@....com>,
        Dong Aisheng <aisheng.dong@....com>
Subject: Re: [PATCH V2] ARM: imx: introduce imx_l2c310_write_sec

On Sat, Dec 30, 2017 at 1:34 PM, Peng Fan <peng.fan@....com> wrote:
> Some PL310 registers could only be wrote in secure world, so
> introduce imx_l2c310_write_sec to support Linux running in
> non-secure world configure PL310.
>
> Signed-off-by: Peng Fan <peng.fan@....com>
> Cc: Shawn Guo <shawnguo@...nel.org>
> Cc: Sascha Hauer <kernel@...gutronix.de>
> Cc: Fabio Estevam <fabio.estevam@....com>
> Cc: Dong Aisheng <aisheng.dong@....com>
> ---
>
> V2:
>  Use SPDX Tag
>  Use CONFIG_HAVE_ARM_SMCCC to fix build error for armv5.
>  Add IS_ENABLED(CONFIG_OPTEE) check when assigning write_sec
>
>  arch/arm/mach-imx/system.c    | 27 ++++++++++++++++++++++++++-
>  include/soc/imx/imx_sip_smc.h | 21 +++++++++++++++++++++
>  2 files changed, 47 insertions(+), 1 deletion(-)
>  create mode 100644 include/soc/imx/imx_sip_smc.h
>
> diff --git a/arch/arm/mach-imx/system.c b/arch/arm/mach-imx/system.c
> index c06af650e6b1..2c27e52d8c7d 100644
> --- a/arch/arm/mach-imx/system.c
> +++ b/arch/arm/mach-imx/system.c
> @@ -23,11 +23,13 @@
>  #include <linux/delay.h>
>  #include <linux/of.h>
>  #include <linux/of_address.h>
> +#include <soc/imx/imx_sip_smc.h>
>
>  #include <asm/system_misc.h>
>  #include <asm/proc-fns.h>
>  #include <asm/mach-types.h>
>  #include <asm/hardware/cache-l2x0.h>
> +#include <asm/outercache.h>
>
>  #include "common.h"
>  #include "hardware.h"
> @@ -92,6 +94,22 @@ void __init imx1_reset_init(void __iomem *base)
>  #endif
>
>  #ifdef CONFIG_CACHE_L2X0
> +#ifdef CONFIG_HAVE_ARM_SMCCC
> +void imx_l2c310_write_sec(unsigned long val, unsigned int reg)
> +{
> +       struct arm_smccc_res res;
> +
> +       arm_smccc_smc(IMX_SIP_SMC_L2C310, val, reg, 0, 0, 0, 0, 0, &res);
> +
> +       if (res.a0 != 0)
> +               pr_err("Failed to write l2c310 0x%x: 0x%lx\n", reg, res.a0);
> +}
> +#else
> +void imx_l2c310_write_sec(unsigned long val, unsigned int reg)
> +{
> +}
> +#endif
> +
>  void __init imx_init_l2cache(void)
>  {
>         void __iomem *l2x0_base;
> @@ -102,6 +120,10 @@ void __init imx_init_l2cache(void)
>         if (!np)
>                 return;
>
> +       if (IS_ENABLED(CONFIG_OPTEE) &&
> +           of_find_compatible_node(NULL, NULL, "linaro,optee-tz"))
> +               outer_cache.write_sec = imx_l2c310_write_sec;
> +
>         l2x0_base = of_iomap(np, 0);
>         if (!l2x0_base)
>                 goto put_node;
> @@ -117,7 +139,10 @@ void __init imx_init_l2cache(void)
>                 val &= ~L310_PREFETCH_CTRL_OFFSET_MASK;
>                 val |= 15;
>
> -               writel_relaxed(val, l2x0_base + L310_PREFETCH_CTRL);
> +               if (outer_cache.write_sec)
> +                       outer_cache.write_sec(val, L310_PREFETCH_CTRL);
> +               else
> +                       writel_relaxed(val, l2x0_base + L310_PREFETCH_CTRL);
>         }
>
>         iounmap(l2x0_base);
> diff --git a/include/soc/imx/imx_sip_smc.h b/include/soc/imx/imx_sip_smc.h
> new file mode 100644
> index 000000000000..c35ae69e0d2f
> --- /dev/null
> +++ b/include/soc/imx/imx_sip_smc.h
> @@ -0,0 +1,21 @@
> +/*
> + * Copyright 2017 NXP
> + *
> + * SPDX-License-Identifier: GPL-2.0
> + */
> +

Thanks! but the SPDX tag should be on the first line as its own
comment. So this would come out something like this

> +/* SPDX-License-Identifier: GPL-2.0 */
> +/* Copyright 2017 NXP */

or

> +/* SPDX-License-Identifier: GPL-2.0 */
> +/*
> + * Copyright 2017 NXP
> + */



> +#ifndef __IMX_SIP_SMC_H_
> +#define __IMX_SIP_SMC_H_
> +
> +#include <linux/arm-smccc.h>
> +
> +#define IMX_SIP_SMC_VAL(func) ARM_SMCCC_CALL_VAL(ARM_SMCCC_FAST_CALL, \
> +                                                ARM_SMCCC_SMC_32, \
> +                                                ARM_SMCCC_OWNER_SIP, \
> +                                                (func))
> +
> +#define IMX_L2C310             0x1
> +
> +#define IMX_SIP_SMC_L2C310     IMX_SIP_SMC_VAL(IMX_L2C310)
> +
> +#endif
> --
> 2.14.1
>



-- 
Cordially
Philippe Ombredanne