linux-kernel - Re: [PATCH v2 35/36] soc: fsl: cpm1: qmc: Handle QUICC Engine (QE) soft-qmc firmware

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Message-ID: <b3323a47-6b57-48ef-ad68-9d457a33a8a3@csgroup.eu>
Date: Fri, 23 Aug 2024 10:14:51 +0200
From: Christophe Leroy <christophe.leroy@...roup.eu>
To: Herve Codina <herve.codina@...tlin.com>, Rob Herring <robh@...nel.org>,
 Krzysztof Kozlowski <krzk+dt@...nel.org>, Conor Dooley
 <conor+dt@...nel.org>, Qiang Zhao <qiang.zhao@....com>,
 Li Yang <leoyang.li@....com>, Mark Brown <broonie@...nel.org>
Cc: linuxppc-dev@...ts.ozlabs.org, linux-arm-kernel@...ts.infradead.org,
 devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
 Thomas Petazzoni <thomas.petazzoni@...tlin.com>
Subject: Re: [PATCH v2 35/36] soc: fsl: cpm1: qmc: Handle QUICC Engine (QE)
 soft-qmc firmware



Le 08/08/2024 à 09:11, Herve Codina a écrit :
> The QUICC Engine (QE) QMC can use a firmware to have the QMC working in
> 'soft-qmc' mode.
> 
> Handle this optional 'soft-qmc' firmware.
> 
> Signed-off-by: Herve Codina <herve.codina@...tlin.com>

Reviewed-by: Christophe Leroy <christophe.leroy@...roup.eu>

> ---
>   drivers/soc/fsl/qe/qmc.c | 67 ++++++++++++++++++++++++++++++++++++++++
>   1 file changed, 67 insertions(+)
> 
> diff --git a/drivers/soc/fsl/qe/qmc.c b/drivers/soc/fsl/qe/qmc.c
> index b3a9534441ee..3dffebb48b0d 100644
> --- a/drivers/soc/fsl/qe/qmc.c
> +++ b/drivers/soc/fsl/qe/qmc.c
> @@ -10,6 +10,7 @@
>   #include <soc/fsl/qe/qmc.h>
>   #include <linux/bitfield.h>
>   #include <linux/dma-mapping.h>
> +#include <linux/firmware.h>
>   #include <linux/hdlc.h>
>   #include <linux/interrupt.h>
>   #include <linux/io.h>
> @@ -1649,6 +1650,66 @@ static irqreturn_t qmc_irq_handler(int irq, void *priv)
>   	return IRQ_HANDLED;
>   }
>   
> +static int qmc_qe_soft_qmc_init(struct qmc *qmc, struct device_node *np)
> +{
> +	struct qe_firmware_info *qe_fw_info;
> +	const struct qe_firmware *qe_fw;
> +	const struct firmware *fw;
> +	const char *filename;
> +	int ret;
> +
> +	ret = of_property_read_string(np, "fsl,soft-qmc", &filename);
> +	switch (ret) {
> +	case 0:
> +		break;
> +	case -EINVAL:
> +		/* fsl,soft-qmc property not set -> Simply do nothing */
> +		return 0;
> +	default:
> +		dev_err(qmc->dev, "%pOF: failed to read fsl,soft-qmc\n",
> +			np);
> +		return ret;
> +	}
> +
> +	qe_fw_info = qe_get_firmware_info();
> +	if (qe_fw_info) {
> +		if (!strstr(qe_fw_info->id, "Soft-QMC")) {
> +			dev_err(qmc->dev, "Another Firmware is already loaded\n");
> +			return -EALREADY;
> +		}
> +		dev_info(qmc->dev, "Firmware already loaded\n");
> +		return 0;
> +	}
> +
> +	dev_info(qmc->dev, "Using firmware %s\n", filename);
> +
> +	ret = request_firmware(&fw, filename, qmc->dev);
> +	if (ret) {
> +		dev_err(qmc->dev, "Failed to request firmware %s\n", filename);
> +		return ret;
> +	}
> +
> +	qe_fw = (const struct qe_firmware *)fw->data;
> +
> +	if (fw->size < sizeof(qe_fw->header) ||
> +	    be32_to_cpu(qe_fw->header.length) != fw->size) {
> +		dev_err(qmc->dev, "Invalid firmware %s\n", filename);
> +		ret = -EINVAL;
> +		goto end;
> +	}
> +
> +	ret = qe_upload_firmware(qe_fw);
> +	if (ret) {
> +		dev_err(qmc->dev, "Failed to load firmware %s\n", filename);
> +		goto end;
> +	}
> +
> +	ret = 0;
> +end:
> +	release_firmware(fw);
> +	return ret;
> +}
> +
>   static int qmc_cpm1_init_resources(struct qmc *qmc, struct platform_device *pdev)
>   {
>   	struct resource *res;
> @@ -1855,6 +1916,12 @@ static int qmc_probe(struct platform_device *pdev)
>   	if (ret)
>   		return ret;
>   
> +	if (qmc_is_qe(qmc)) {
> +		ret = qmc_qe_soft_qmc_init(qmc, np);
> +		if (ret)
> +			return ret;
> +	}
> +
>   	/* Parse channels informationss */
>   	ret = qmc_of_parse_chans(qmc, np);
>   	if (ret)