linux-kernel - Re: [PATCH v2 5/7] remoteproc: qcom: q6v5: Add support for q6 rmb registers

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Date:   Wed, 15 Mar 2023 19:17:36 -0700
From:   Bjorn Andersson <andersson@...nel.org>
To:     Melody Olvera <quic_molvera@...cinc.com>
Cc:     Andy Gross <agross@...nel.org>, Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Jassi Brar <jassisinghbrar@...il.com>,
        Mathieu Poirier <mathieu.poirier@...aro.org>,
        Robert Marko <robimarko@...il.com>,
        Guru Das Srinagesh <quic_gurus@...cinc.com>,
        Konrad Dybcio <konrad.dybcio@...aro.org>,
        Manivannan Sadhasivam <mani@...nel.org>,
        linux-arm-msm@...r.kernel.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-remoteproc@...r.kernel.org
Subject: Re: [PATCH v2 5/7] remoteproc: qcom: q6v5: Add support for q6 rmb
 registers

On Mon, Mar 06, 2023 at 03:12:00PM -0800, Melody Olvera wrote:
> When attaching a running Q6, the remoteproc driver needs a way
> to communicate with the Q6 using rmb registers, so allow the
> rmb register to be gotten from the device tree if present.
> 
> Signed-off-by: Melody Olvera <quic_molvera@...cinc.com>
> ---
>  drivers/remoteproc/qcom_q6v5.c | 9 +++++++++
>  drivers/remoteproc/qcom_q6v5.h | 8 ++++++++
>  2 files changed, 17 insertions(+)
> 
> diff --git a/drivers/remoteproc/qcom_q6v5.c b/drivers/remoteproc/qcom_q6v5.c
> index 192c7aa0e39e..e8c6be70ebfd 100644
> --- a/drivers/remoteproc/qcom_q6v5.c
> +++ b/drivers/remoteproc/qcom_q6v5.c
> @@ -254,6 +254,7 @@ int qcom_q6v5_init(struct qcom_q6v5 *q6v5, struct platform_device *pdev,
>  		   void (*handover)(struct qcom_q6v5 *q6v5))
>  {
>  	int ret;
> +	struct resource *res;
>  
>  	q6v5->rproc = rproc;
>  	q6v5->dev = &pdev->dev;
> @@ -263,6 +264,14 @@ int qcom_q6v5_init(struct qcom_q6v5 *q6v5, struct platform_device *pdev,
>  	init_completion(&q6v5->start_done);
>  	init_completion(&q6v5->stop_done);
>  
> +	res = platform_get_resource(pdev, IORESOURCE_MEM, 1);

In addition to the PAS driver, __func__ is being invoked by the non-PAS
ADSP and MPSS drivers as well, which both uses reg[1] for other
purposes. So this won't work.

Perhaps I'm missing some possibility of reuse, but it seems reasonable
for this to move to the pas-driver.

Thanks,
Bjorn

> +	if (res) {
> +		q6v5->rmb_base = devm_ioremap_resource(&pdev->dev, res);
> +		if (IS_ERR(q6v5->rmb_base))
> +			q6v5->rmb_base = NULL;
> +	} else
> +		q6v5->rmb_base = NULL;
> +
>  	q6v5->wdog_irq = platform_get_irq_byname(pdev, "wdog");
>  	if (q6v5->wdog_irq < 0)
>  		return q6v5->wdog_irq;
> diff --git a/drivers/remoteproc/qcom_q6v5.h b/drivers/remoteproc/qcom_q6v5.h
> index 5a859c41896e..95824d5b64ce 100644
> --- a/drivers/remoteproc/qcom_q6v5.h
> +++ b/drivers/remoteproc/qcom_q6v5.h
> @@ -7,6 +7,12 @@
>  #include <linux/completion.h>
>  #include <linux/soc/qcom/qcom_aoss.h>
>  
> +#define RMB_BOOT_WAIT_REG 0x8
> +#define RMB_BOOT_CONT_REG 0xC
> +#define RMB_Q6_BOOT_STATUS_REG 0x10
> +
> +#define RMB_POLL_MAX_TIMES 250
> +
>  struct icc_path;
>  struct rproc;
>  struct qcom_smem_state;
> @@ -16,6 +22,8 @@ struct qcom_q6v5 {
>  	struct device *dev;
>  	struct rproc *rproc;
>  
> +	void __iomem *rmb_base;
> +
>  	struct qcom_smem_state *state;
>  	struct qmp *qmp;
>  
> -- 
> 2.25.1
>