linux-kernel - Re: [PATCH V14 5/9] dma: qcom_hidma: implement lower level hardware interface

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Date:	Fri, 11 Mar 2016 03:08:29 -0000
From:	Okaya@...eaurora.org
To:	"Vinod Koul" <vinod.koul@...el.com>
Cc:	"Sinan Kaya" <okaya@...eaurora.org>, dmaengine@...r.kernel.org,
	marc.zyngier@....com, mark.rutland@....com, timur@...eaurora.org,
	devicetree@...r.kernel.org, cov@...eaurora.org, jcm@...hat.com,
	shankerd@...eaurora.org, vikrams@...eaurora.org,
	eric.auger@...aro.org, agross@...eaurora.org, arnd@...db.de,
	linux-arm-msm@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH V14 5/9] dma: qcom_hidma: implement lower level hardware
 interface

> On Thu, Feb 04, 2016 at 11:34:36PM -0500, Sinan Kaya wrote:
>
>> +
>> +#define EVRE_SIZE			16	/* each EVRE is 16 bytes */
>> +
>> +#define TRCA_CTRLSTS_OFFSET		0x000
>> +#define TRCA_RING_LOW_OFFSET		0x008
>> +#define TRCA_RING_HIGH_OFFSET		0x00C
>> +#define TRCA_RING_LEN_OFFSET		0x010
>> +#define TRCA_READ_PTR_OFFSET		0x018
>> +#define TRCA_WRITE_PTR_OFFSET		0x020
>> +#define TRCA_DOORBELL_OFFSET		0x400
>> +
>> +#define EVCA_CTRLSTS_OFFSET		0x000
>> +#define EVCA_INTCTRL_OFFSET		0x004
>> +#define EVCA_RING_LOW_OFFSET		0x008
>> +#define EVCA_RING_HIGH_OFFSET		0x00C
>> +#define EVCA_RING_LEN_OFFSET		0x010
>> +#define EVCA_READ_PTR_OFFSET		0x018
>> +#define EVCA_WRITE_PTR_OFFSET		0x020
>> +#define EVCA_DOORBELL_OFFSET		0x400
>> +
>> +#define EVCA_IRQ_STAT_OFFSET		0x100
>> +#define EVCA_IRQ_CLR_OFFSET		0x108
>> +#define EVCA_IRQ_EN_OFFSET		0x110
>> +
>> +#define EVRE_CFG_IDX			0
>> +#define EVRE_LEN_IDX			1
>> +#define EVRE_DEST_LOW_IDX		2
>> +#define EVRE_DEST_HI_IDX		3
>> +
>> +#define EVRE_ERRINFO_BIT_POS		24
>> +#define EVRE_CODE_BIT_POS		28
>> +
>> +#define EVRE_ERRINFO_MASK		GENMASK(3, 0)
>> +#define EVRE_CODE_MASK			GENMASK(3, 0)
>
> These are rest here are not namespace properly...
>
>> +static int hidma_ll_enable(struct hidma_lldev *lldev)
>> +{
>> +	u32 val;
>> +	int ret;
>> +
>> +	val = readl(lldev->evca + EVCA_CTRLSTS_OFFSET);
>> +	val &= ~(CH_CONTROL_MASK << 16);
>> +	val |= CH_ENABLE << 16;
>> +	writel(val, lldev->evca + EVCA_CTRLSTS_OFFSET);
>> +
>> +	ret = readl_poll_timeout(lldev->evca + EVCA_CTRLSTS_OFFSET, val,
>> +				 (HIDMA_CH_STATE(val) == CH_ENABLED) ||
>> +				 (HIDMA_CH_STATE(val) == CH_RUNNING), 1000,
>> +				 10000);
>> +	if (ret) {
>> +		dev_err(lldev->dev, "event channel did not get enabled\n");
>> +		return ret;
>> +	}
>> +
>> +	val = readl(lldev->trca + TRCA_CTRLSTS_OFFSET);
>> +	val &= ~(CH_CONTROL_MASK << 16);
>> +	val |= CH_ENABLE << 16;
>> +	writel(val, lldev->trca + TRCA_CTRLSTS_OFFSET);
>> +
>> +	ret = readl_poll_timeout(lldev->trca + TRCA_CTRLSTS_OFFSET, val,
>> +				 (HIDMA_CH_STATE(val) == CH_ENABLED) ||
>> +				 (HIDMA_CH_STATE(val) == CH_RUNNING), 1000,
>> +				 10000);
>
> first arg for readl_poll_timeout is accessor fn to do read, which doesnt
> seem to be here... so what did i miss?
>

First argument is the address to read.

#define readl_poll_timeout(addr, val, cond, delay_us, timeout_us) \
         readx_poll_timeout(readl, addr, val, cond, delay_us, timeout_us)


>
>> +void hidma_ll_queue_request(struct hidma_lldev *lldev, u32 tre_ch)
>> +{
>> +	struct hidma_tre *tre;
>> +	unsigned long flags;
>> +
>> +	tre = &lldev->trepool[tre_ch];
>> +
>> +	/* copy the TRE into its location in the TRE ring */
>> +	spin_lock_irqsave(&lldev->lock, flags);
>> +	tre->tre_index = lldev->tre_write_offset / TRE_SIZE;
>> +	lldev->pending_tre_list[tre->tre_index] = tre;
>> +	memcpy(lldev->tre_ring + lldev->tre_write_offset, &tre->tre_local[0],
>> +	       TRE_SIZE);
>> +	lldev->tx_status_list[tre->idx].err_code = 0;
>> +	lldev->tx_status_list[tre->idx].err_info = 0;
>> +	tre->queued = 1;
>> +	lldev->pending_tre_count++;
>> +	lldev->tre_write_offset = (lldev->tre_write_offset + TRE_SIZE)
>> +	    % lldev->tre_ring_size;
>
> These and above one should be right justfied per coding style
>
> --
> ~Vinod
>