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From: Vinod Koul <vkoul@kernel.org>
To: Biju Das <biju.das.jz@bp.renesas.com>
Cc: Lad Prabhakar <prabhakar.mahadev-lad.rj@bp.renesas.com>,
	Chris Paterson <Chris.Paterson2@renesas.com>,
	Geert Uytterhoeven <geert+renesas@glider.be>,
	dmaengine@vger.kernel.org,
	Chris Brandt <chris.brandt@renesas.com>,
	linux-renesas-soc@vger.kernel.org
Subject: Re: [PATCH v4 2/4] drivers: dma: sh: Add DMAC driver for RZ/G2L SoC
Date: Tue, 27 Jul 2021 18:10:15 +0530	[thread overview]
Message-ID: <YP/+r4HzCaAZbUWh@matsya> (raw)
In-Reply-To: <20210719092535.4474-3-biju.das.jz@bp.renesas.com>

On 19-07-21, 10:25, Biju Das wrote:

> +struct rz_dmac_chan {
> +	struct virt_dma_chan vc;
> +	void __iomem *ch_base;
> +	void __iomem *ch_cmn_base;
> +	unsigned int index;
> +	int irq;
> +	struct rz_dmac_desc *desc;
> +	int descs_allocated;
> +
> +	enum dma_slave_buswidth src_word_size;
> +	enum dma_slave_buswidth dst_word_size;
> +	dma_addr_t src_per_address;
> +	dma_addr_t dst_per_address;
> +
> +	u32 chcfg;
> +	u32 chctrl;
> +	int mid_rid;
> +
> +	struct list_head ld_free;
> +	struct list_head ld_queue;
> +	struct list_head ld_active;
> +
> +	struct {
> +		struct rz_lmdesc *base;
> +		struct rz_lmdesc *head;
> +		struct rz_lmdesc *tail;
> +		int valid;
> +		dma_addr_t base_dma;
> +	} lmdesc;

should this be not part of rz_dmac_desc than channel?

> +static int rz_dmac_config(struct dma_chan *chan,
> +			  struct dma_slave_config *config)
> +{
> +	struct rz_dmac_chan *channel = to_rz_dmac_chan(chan);
> +	u32 *ch_cfg;
> +
> +	channel->src_per_address = config->src_addr;
> +	channel->src_word_size = config->src_addr_width;
> +	channel->dst_per_address = config->dst_addr;
> +	channel->dst_word_size = config->dst_addr_width;
> +
> +	if (config->peripheral_config) {
> +		ch_cfg = config->peripheral_config;
> +		channel->chcfg = *ch_cfg;
> +	}

can you explain what this the ch_cfg here and what does it represent?

-- 
~Vinod

  parent reply	other threads:[~2021-07-27 12:40 UTC|newest]

Thread overview: 11+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-07-19  9:25 [PATCH v4 0/4] Add RZ/G2L DMAC support Biju Das
2021-07-19  9:25 ` [PATCH v4 2/4] drivers: dma: sh: Add DMAC driver for RZ/G2L SoC Biju Das
2021-07-27  7:56   ` Biju Das
2021-07-27 12:40   ` Vinod Koul [this message]
2021-07-27 13:45     ` Biju Das
2021-07-28  6:20       ` Vinod Koul
2021-07-28  7:00         ` Biju Das
2021-07-28 11:05           ` Vinod Koul
2021-07-28 11:58             ` Biju Das
2021-07-28 12:34               ` Geert Uytterhoeven
2021-07-28 12:42                 ` Biju Das

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