linux-kernel - Re: [PATCH v11 12/12] dmaengine: imx-sdma: add uart rom script

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Date:   Mon, 10 Aug 2020 15:06:05 +0200
From:   Robert Schwebel <r.schwebel@...gutronix.de>
To:     Robin Gong <yibin.gong@....com>
Cc:     Frieder Schrempf <frieder.schrempf@...tron.de>,
        "mark.rutland@....com" <mark.rutland@....com>,
        "broonie@...nel.org" <broonie@...nel.org>,
        "robh+dt@...nel.org" <robh+dt@...nel.org>,
        "catalin.marinas@....com" <catalin.marinas@....com>,
        "vkoul@...nel.org" <vkoul@...nel.org>,
        "will.deacon@....com" <will.deacon@....com>,
        "shawnguo@...nel.org" <shawnguo@...nel.org>,
        "festevam@...il.com" <festevam@...il.com>,
        "s.hauer@...gutronix.de" <s.hauer@...gutronix.de>,
        "martin.fuzzey@...wbird.group" <martin.fuzzey@...wbird.group>,
        "u.kleine-koenig@...gutronix.de" <u.kleine-koenig@...gutronix.de>,
        "dan.j.williams@...el.com" <dan.j.williams@...el.com>,
        "matthias.schiffer@...tq-group.com" 
        <matthias.schiffer@...tq-group.com>,
        "devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "linux-spi@...r.kernel.org" <linux-spi@...r.kernel.org>,
        dl-linux-imx <linux-imx@....com>,
        "kernel@...gutronix.de" <kernel@...gutronix.de>,
        "dmaengine@...r.kernel.org" <dmaengine@...r.kernel.org>,
        "linux-arm-kernel@...ts.infradead.org" 
        <linux-arm-kernel@...ts.infradead.org>
Subject: Re: [PATCH v11 12/12] dmaengine: imx-sdma: add uart rom script

On Mon, Aug 10, 2020 at 10:57:42AM +0000, Robin Gong wrote:
> diff --git a/drivers/dma/imx-sdma.c b/drivers/dma/imx-sdma.c
> index 5900e32..4db55b9 100644
> --- a/drivers/dma/imx-sdma.c
> +++ b/drivers/dma/imx-sdma.c
> @@ -1754,6 +1754,19 @@ static void sdma_add_scripts(struct sdma_engine *sdma,
>         for (i = 0; i < sdma->script_number; i++)
>                 if (addr_arr[i] > 0)
>                         saddr_arr[i] = addr_arr[i];
> +
> +       /*
> +        * get uart_2_mcu_addr/uartsh_2_mcu_addr rom script specially because
> +        * they are now replaced by uart_2_mcu_ram_addr/uartsh_2_mcu_ram_addr
> +        * to be compatible with legacy freescal/nxp sdma firmware, and they

freescale

> +        * are located in the bottom part of sdma_script_start_addrs which are
> +        * beyond the SDMA_SCRIPT_ADDRS_ARRAY_SIZE_V1.
> +        */

rsc
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