linux-kernel - Re: [PATCH v4 04/20] drivers: crypto: meson: add MMIO helpers

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Date: Mon, 12 Feb 2024 18:11:20 +0100
From: neil.armstrong@...aro.org
To: Alexey Romanov <avromanov@...utedevices.com>, clabbe@...libre.com,
 herbert@...dor.apana.org.au, davem@...emloft.net, robh+dt@...nel.org,
 krzysztof.kozlowski+dt@...aro.org, conor+dt@...nel.org,
 khilman@...libre.com, jbrunet@...libre.com,
 martin.blumenstingl@...glemail.com, vadim.fedorenko@...ux.dev
Cc: linux-crypto@...r.kernel.org, linux-amlogic@...ts.infradead.org,
 linux-kernel@...r.kernel.org, devicetree@...r.kernel.org,
 linux-arm-kernel@...ts.infradead.org, kernel@...utedevices.com
Subject: Re: [PATCH v4 04/20] drivers: crypto: meson: add MMIO helpers

On 12/02/2024 14:50, Alexey Romanov wrote:
> Add MMIO access helpers: meson_dma_start() and meson_dma_ready().
> 
> Signed-off-by: Alexey Romanov <avromanov@...utedevices.com>
> ---
>   drivers/crypto/amlogic/amlogic-gxl-cipher.c |  2 +-
>   drivers/crypto/amlogic/amlogic-gxl-core.c   | 24 ++++++++++++++++-----
>   drivers/crypto/amlogic/amlogic-gxl.h        |  2 ++
>   3 files changed, 22 insertions(+), 6 deletions(-)
> 
> diff --git a/drivers/crypto/amlogic/amlogic-gxl-cipher.c b/drivers/crypto/amlogic/amlogic-gxl-cipher.c
> index 7eff3ae7356f..1fe916b0a138 100644
> --- a/drivers/crypto/amlogic/amlogic-gxl-cipher.c
> +++ b/drivers/crypto/amlogic/amlogic-gxl-cipher.c
> @@ -225,7 +225,7 @@ static int meson_cipher(struct skcipher_request *areq)
>   
>   	reinit_completion(&mc->chanlist[flow].complete);
>   	mc->chanlist[flow].status = 0;
> -	writel(mc->chanlist[flow].t_phy | 2, mc->base + ((mc->pdata->descs_reg + flow) << 2));
> +	meson_dma_start(mc, flow);
>   	wait_for_completion_interruptible_timeout(&mc->chanlist[flow].complete,
>   						  msecs_to_jiffies(500));
>   	if (mc->chanlist[flow].status == 0) {
> diff --git a/drivers/crypto/amlogic/amlogic-gxl-core.c b/drivers/crypto/amlogic/amlogic-gxl-core.c
> index 54113c524ec5..372c30f72072 100644
> --- a/drivers/crypto/amlogic/amlogic-gxl-core.c
> +++ b/drivers/crypto/amlogic/amlogic-gxl-core.c
> @@ -23,18 +23,32 @@
>   
>   #include "amlogic-gxl.h"
>   
> +void meson_dma_start(struct meson_dev *mc, int flow)
> +{
> +	u32 offset = (mc->pdata->descs_reg + flow) << 2;
> +
> +	writel(mc->chanlist[flow].t_phy | 2, mc->base + offset);
> +}
> +
> +static bool meson_dma_ready(struct meson_dev *mc, int flow)
> +{
> +	u32 offset = (mc->pdata->status_reg + flow) << 2;
> +	u32 data = readl(mc->base + offset);
> +
> +	if (data)
> +		writel_relaxed(0xF, mc->base + offset);
> +
> +	return data;
> +}
> +
>   static irqreturn_t meson_irq_handler(int irq, void *data)
>   {
>   	struct meson_dev *mc = (struct meson_dev *)data;
>   	int flow;
> -	u32 p;
>   
>   	for (flow = 0; flow < mc->flow_cnt; flow++) {
>   		if (mc->chanlist[flow].irq == irq) {
> -			p = readl(mc->base + ((mc->pdata->status_reg + flow) << 2));
> -			if (p) {
> -				writel_relaxed(0xF, mc->base +
> -					      ((mc->pdata->status_reg + flow) << 2));
> +			if (meson_dma_ready(mc, flow)) {
>   				mc->chanlist[flow].status = 1;
>   				complete(&mc->chanlist[flow].complete);
>   				return IRQ_HANDLED;
> diff --git a/drivers/crypto/amlogic/amlogic-gxl.h b/drivers/crypto/amlogic/amlogic-gxl.h
> index a36b9bac63a0..59fc6a67e0a9 100644
> --- a/drivers/crypto/amlogic/amlogic-gxl.h
> +++ b/drivers/crypto/amlogic/amlogic-gxl.h
> @@ -163,6 +163,8 @@ struct meson_alg_template {
>   #endif
>   };
>   
> +void meson_dma_start(struct meson_dev *mc, int flow);
> +
>   int meson_enqueue(struct crypto_async_request *areq, u32 type);
>   
>   int meson_aes_setkey(struct crypto_skcipher *tfm, const u8 *key,

Reviewed-by: Neil Armstrong <neil.armstrong@...aro.org>