From: Mathieu Poirier <mathieu.poirier@linaro.org>
To: nikita.shubin@maquefel.me
Cc: Ohad Ben-Cohen <ohad@wizery.com>,
Fabio Estevam <festevam@gmail.com>,
Nikita Shubin <NShubin@topcon.com>,
Sascha Hauer <s.hauer@pengutronix.de>,
linux-remoteproc@vger.kernel.org, linux-kernel@vger.kernel.org,
Bjorn Andersson <bjorn.andersson@linaro.org>,
NXP Linux Team <linux-imx@nxp.com>,
Pengutronix Kernel Team <kernel@pengutronix.de>,
Shawn Guo <shawnguo@kernel.org>,
linux-arm-kernel@lists.infradead.org
Subject: Re: [PATCH v2 1/3] remoteproc: imx_rproc: set pc on start
Date: Tue, 14 Apr 2020 10:45:19 -0600 [thread overview]
Message-ID: <20200414164519.GA24061@xps15> (raw)
In-Reply-To: <20200406113310.3041-2-nikita.shubin@maquefel.me>
Hi Nikita,
On Mon, Apr 06, 2020 at 02:33:08PM +0300, nikita.shubin@maquefel.me wrote:
> In case elf file interrupt vector is not supposed to be at OCRAM_S,
> it is needed to write elf entry point to OCRAM_S + 0x4, to boot M4
> firmware.
>
> Otherwise firmware located anywhere besides OCRAM_S won't boot.
>
> The firmware must set stack poiner as first instruction:
>
> Reset_Handler:
> ldr sp, = __stack /* set stack pointer */
>
> Signed-off-by: Nikita Shubin <NShubin@topcon.com>
The address in the SoB has to match what is found in the "From:" field of the
email header. Checkpatch is complaining about that, something I would have
expected to be fixed before sending this set out.
> ---
> drivers/remoteproc/imx_rproc.c | 16 +++++++++++++++-
> 1 file changed, 15 insertions(+), 1 deletion(-)
>
> diff --git a/drivers/remoteproc/imx_rproc.c b/drivers/remoteproc/imx_rproc.c
> index 3e72b6f38d4b..bebc58d0f711 100644
> --- a/drivers/remoteproc/imx_rproc.c
> +++ b/drivers/remoteproc/imx_rproc.c
> @@ -45,6 +45,8 @@
>
> #define IMX7D_RPROC_MEM_MAX 8
>
> +#define IMX_BOOT_PC 0x4
> +
> /**
> * struct imx_rproc_mem - slim internal memory structure
> * @cpu_addr: MPU virtual address of the memory region
> @@ -85,6 +87,7 @@ struct imx_rproc {
> const struct imx_rproc_dcfg *dcfg;
> struct imx_rproc_mem mem[IMX7D_RPROC_MEM_MAX];
> struct clk *clk;
> + void __iomem *bootreg;
> };
>
> static const struct imx_rproc_att imx_rproc_att_imx7d[] = {
> @@ -162,11 +165,16 @@ static int imx_rproc_start(struct rproc *rproc)
> struct device *dev = priv->dev;
> int ret;
>
> + /* write entry point to program counter */
> + writel(rproc->bootaddr, priv->bootreg);
What happens on all the other IMX systems where this fix is not needed? Will
they continue to work properly?
> +
> ret = regmap_update_bits(priv->regmap, dcfg->src_reg,
> dcfg->src_mask, dcfg->src_start);
> if (ret)
> dev_err(dev, "Failed to enable M4!\n");
>
> + dev_info(&rproc->dev, "Started from 0x%x\n", rproc->bootaddr);
> +
> return ret;
> }
>
> @@ -182,6 +190,9 @@ static int imx_rproc_stop(struct rproc *rproc)
> if (ret)
> dev_err(dev, "Failed to stop M4!\n");
>
> + /* clear entry points */
> + writel(0, priv->bootreg);
> +
> return ret;
> }
>
> @@ -243,7 +254,8 @@ static void *imx_rproc_da_to_va(struct rproc *rproc, u64 da, int len)
> static const struct rproc_ops imx_rproc_ops = {
> .start = imx_rproc_start,
> .stop = imx_rproc_stop,
> - .da_to_va = imx_rproc_da_to_va,
> + .da_to_va = imx_rproc_da_to_va,
> + .get_boot_addr = rproc_elf_get_boot_addr,
How is this useful? Sure it will set rproc->bootaddr in rproc_fw_boot() but
what good does that do when it is invariably set again in imx_rproc_start() ?
> };
>
> static int imx_rproc_addr_init(struct imx_rproc *priv,
> @@ -360,6 +372,8 @@ static int imx_rproc_probe(struct platform_device *pdev)
> goto err_put_rproc;
> }
>
> + priv->bootreg = imx_rproc_da_to_va(rproc, IMX_BOOT_PC, sizeof(u32));
> +
> /*
> * clk for M4 block including memory. Should be
> * enabled before .start for FW transfer.
> --
> 2.25.1
>
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next prev parent reply other threads:[~2020-04-14 16:45 UTC|newest]
Thread overview: 29+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-03-04 14:26 [PATCH 1/2] remoteproc: imx_rproc: dummy kick method Nikita Shubin
2020-03-04 14:26 ` [PATCH 2/2] remoteproc: imx_rproc: set pc on start Nikita Shubin
2020-03-05 16:16 ` [PATCH 1/2] remoteproc: imx_rproc: dummy kick method Mathieu Poirier
2020-03-05 17:29 ` nikita.shubin
2020-03-05 17:54 ` Mathieu Poirier
2020-03-05 18:07 ` nikita.shubin
2020-03-05 18:36 ` Mathieu Poirier
2020-03-05 18:46 ` nikita.shubin
2020-04-06 11:33 ` [PATCH v2 0/3] remoteproc: imx_rproc: add virtio support nikita.shubin
2020-04-06 11:33 ` [PATCH v2 1/3] remoteproc: imx_rproc: set pc on start nikita.shubin
2020-04-14 16:45 ` Mathieu Poirier [this message]
2020-04-17 12:11 ` Nikita Shubin
2020-04-17 15:37 ` Mathieu Poirier
2020-04-17 15:46 ` Nikita Shubin
[not found] ` <45761587100993@mail.yandex.ru>
2020-04-17 17:01 ` Mathieu Poirier
2020-04-17 17:26 ` Nikita Shubin
2020-04-17 22:24 ` Mathieu Poirier
2020-04-22 7:35 ` Nikita Shubin
2020-04-06 11:33 ` [PATCH v2 2/3] remoteproc: imx_rproc: mailbox support nikita.shubin
2020-04-07 1:07 ` kbuild test robot
2020-04-14 17:20 ` Mathieu Poirier
2020-04-17 8:37 ` Nikita Shubin
2020-04-17 16:02 ` Mathieu Poirier
2020-04-14 17:36 ` Mathieu Poirier
2020-04-06 11:33 ` [PATCH v2 3/3] remoteproc: imx_rproc: memory regions nikita.shubin
2020-04-14 17:46 ` Mathieu Poirier
2020-04-15 2:42 ` [PATCH v2 0/3] remoteproc: imx_rproc: add virtio support Peng Fan
2020-04-15 16:26 ` Mathieu Poirier
2020-04-17 8:57 ` Nikita Shubin
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