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Message-ID: <1475680464.7320.44.camel@synopsys.com>
Date:   Wed, 5 Oct 2016 15:14:25 +0000
From:   Eugeniy Paltsev <Eugeniy.Paltsev@...opsys.com>
To:     "andriy.shevchenko@...ux.intel.com" 
        <andriy.shevchenko@...ux.intel.com>
CC:     "dan.j.williams@...el.com" <dan.j.williams@...el.com>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "Eugeniy.Paltsev@...opsys.com" <Eugeniy.Paltsev@...opsys.com>,
        "vireshk@...nel.org" <vireshk@...nel.org>,
        "vinod.koul@...el.com" <vinod.koul@...el.com>,
        "linux-snps-arc@...ts.infradead.org" 
        <linux-snps-arc@...ts.infradead.org>,
        "dmaengine@...r.kernel.org" <dmaengine@...r.kernel.org>
Subject: Re: [PATCH] dmaengine: DW DMAC: split pdata to hardware properties
 and platform quirks

Hi Andy,
what do you think about these changes?

On Thu, 2016-09-15 at 16:14 +0300, Eugeniy Paltsev wrote:
> This patch is to address a proposal by Andy in this thread:
> http://www.spinics.net/lists/dmaengine/msg10754.html
> Split platform data to actual hardware properties, and platform
> quirks.
> Now we able to use quirks and hardware properties separately from
> different sources (pdata, device tree or autoconfig registers)
> 
> Signed-off-by: Eugeniy Paltsev <Eugeniy.Paltsev@...opsys.com>
> ---
>  drivers/dma/dw/core.c                | 31 +++++++++++++++-----------
>  drivers/dma/dw/platform.c            | 42 +++++++++++++++++++++-----
> ----------
>  include/linux/platform_data/dma-dw.h | 20 +++++++++++------
>  3 files changed, 57 insertions(+), 36 deletions(-)
> 
> diff --git a/drivers/dma/dw/core.c b/drivers/dma/dw/core.c
> index c2c0a61..9352735 100644
> --- a/drivers/dma/dw/core.c
> +++ b/drivers/dma/dw/core.c
> @@ -1451,10 +1451,25 @@ int dw_dma_probe(struct dw_dma_chip *chip)
>  
>  	dw->regs = chip->regs;
>  	chip->dw = dw;
> +	/* Reassign the platform data pointer */
> +	pdata = dw->pdata;
>  
>  	pm_runtime_get_sync(chip->dev);
>  
> -	if (!chip->pdata) {
> +	if ((!chip->pdata) ||
> +	   (chip->pdata && test_bit(QUIRKS_ONLY_USED, &chip->pdata-
> >quirks))) {
> +
> +		/*
> +		 * Fill quirks with the default values in case of
> pdata absence
> +		 */
> +		if (!chip->pdata) {
> +			set_bit(QUIRKS_IS_PRIVATE, &pdata->quirks);
> +			set_bit(QUIRKS_IS_MEMCPY, &pdata->quirks);
> +			set_bit(QUIRKS_IS_NOLLP, &pdata->quirks);
> +		} else {
> +			pdata->quirks = chip->pdata->quirks;
> +		}
> +
>  		dw_params = dma_readl(dw, DW_PARAMS);
>  		dev_dbg(chip->dev, "DW_PARAMS: 0x%08x\n",
> dw_params);
>  
> @@ -1464,9 +1479,6 @@ int dw_dma_probe(struct dw_dma_chip *chip)
>  			goto err_pdata;
>  		}
>  
> -		/* Reassign the platform data pointer */
> -		pdata = dw->pdata;
> -
>  		/* Get hardware configuration parameters */
>  		pdata->nr_channels = (dw_params >> DW_PARAMS_NR_CHAN
> & 7) + 1;
>  		pdata->nr_masters = (dw_params >>
> DW_PARAMS_NR_MASTER & 3) + 1;
> @@ -1477,8 +1489,6 @@ int dw_dma_probe(struct dw_dma_chip *chip)
>  		pdata->block_size = dma_readl(dw, MAX_BLK_SIZE);
>  
>  		/* Fill platform data with the default values */
> -		pdata->is_private = true;
> -		pdata->is_memcpy = true;
>  		pdata->chan_allocation_order =
> CHAN_ALLOCATION_ASCENDING;
>  		pdata->chan_priority = CHAN_PRIORITY_ASCENDING;
>  	} else if (chip->pdata->nr_channels >
> DW_DMA_MAX_NR_CHANNELS) {
> @@ -1486,9 +1496,6 @@ int dw_dma_probe(struct dw_dma_chip *chip)
>  		goto err_pdata;
>  	} else {
>  		memcpy(dw->pdata, chip->pdata, sizeof(*dw->pdata));
> -
> -		/* Reassign the platform data pointer */
> -		pdata = dw->pdata;
>  	}
>  
>  	dw->chan = devm_kcalloc(chip->dev, pdata->nr_channels,
> sizeof(*dw->chan),
> @@ -1569,7 +1576,7 @@ int dw_dma_probe(struct dw_dma_chip *chip)
>  				(dwc_params >> DWC_PARAMS_MBLK_EN &
> 0x1) == 0;
>  		} else {
>  			dwc->block_size = pdata->block_size;
> -			dwc->nollp = pdata->is_nollp;
> +			dwc->nollp = test_bit(QUIRKS_IS_NOLLP,
> &pdata->quirks);
>  		}
>  	}
>  
> @@ -1582,9 +1589,9 @@ int dw_dma_probe(struct dw_dma_chip *chip)
>  
>  	/* Set capabilities */
>  	dma_cap_set(DMA_SLAVE, dw->dma.cap_mask);
> -	if (pdata->is_private)
> +	if (test_bit(QUIRKS_IS_PRIVATE, &pdata->quirks))
>  		dma_cap_set(DMA_PRIVATE, dw->dma.cap_mask);
> -	if (pdata->is_memcpy)
> +	if (test_bit(QUIRKS_IS_MEMCPY, &pdata->quirks))
>  		dma_cap_set(DMA_MEMCPY, dw->dma.cap_mask);
>  
>  	dw->dma.dev = chip->dev;
> diff --git a/drivers/dma/dw/platform.c b/drivers/dma/dw/platform.c
> index 5bda0eb..308b977 100644
> --- a/drivers/dma/dw/platform.c
> +++ b/drivers/dma/dw/platform.c
> @@ -12,6 +12,7 @@
>   * published by the Free Software Foundation.
>   */
>  
> +#include <linux/bitops.h>
>  #include <linux/module.h>
>  #include <linux/device.h>
>  #include <linux/clk.h>
> @@ -111,41 +112,48 @@ dw_dma_parse_dt(struct platform_device *pdev)
>  		return NULL;
>  	}
>  
> -	if (of_property_read_u32(np, "dma-masters", &nr_masters))
> -		return NULL;
> -	if (nr_masters < 1 || nr_masters > DW_DMA_MAX_NR_MASTERS)
> -		return NULL;
> -
> -	if (of_property_read_u32(np, "dma-channels", &nr_channels))
> -		return NULL;
> -
>  	pdata = devm_kzalloc(&pdev->dev, sizeof(*pdata),
> GFP_KERNEL);
>  	if (!pdata)
>  		return NULL;
>  
> +	set_bit(QUIRKS_ONLY_USED, &pdata->quirks);
> +
> +	if (of_property_read_bool(np, "is-private"))
> +		set_bit(QUIRKS_IS_PRIVATE, &pdata->quirks);
> +
> +	if (of_property_read_bool(np, "is-memcpy"))
> +		set_bit(QUIRKS_IS_MEMCPY, &pdata->quirks);
> +
> +	if (of_property_read_bool(np, "is-nollp"))
> +		set_bit(QUIRKS_IS_NOLLP, &pdata->quirks);
> +
> +	if (of_property_read_u32(np, "dma-masters", &nr_masters))
> +		return pdata;
> +	if (nr_masters < 1 || nr_masters > DW_DMA_MAX_NR_MASTERS)
> +		return pdata;
> +
>  	pdata->nr_masters = nr_masters;
> -	pdata->nr_channels = nr_channels;
>  
> -	if (of_property_read_bool(np, "is_private"))
> -		pdata->is_private = true;
> +	if (of_property_read_u32(np, "dma-channels", &nr_channels))
> +		return pdata;
>  
> -	if (!of_property_read_u32(np, "chan_allocation_order",
> &tmp))
> +	pdata->nr_channels = nr_channels;
> +
> +	if (!of_property_read_u32(np, "chan-allocation-order",
> &tmp))
>  		pdata->chan_allocation_order = (unsigned char)tmp;
>  
> -	if (!of_property_read_u32(np, "chan_priority", &tmp))
> +	if (!of_property_read_u32(np, "chan-priority", &tmp))
>  		pdata->chan_priority = tmp;
>  
> -	if (!of_property_read_u32(np, "block_size", &tmp))
> +	if (!of_property_read_u32(np, "block-size", &tmp))
>  		pdata->block_size = tmp;
>  
>  	if (!of_property_read_u32_array(np, "data-width", arr,
> nr_masters)) {
>  		for (tmp = 0; tmp < nr_masters; tmp++)
>  			pdata->data_width[tmp] = arr[tmp];
> -	} else if (!of_property_read_u32_array(np, "data_width",
> arr, nr_masters)) {
> -		for (tmp = 0; tmp < nr_masters; tmp++)
> -			pdata->data_width[tmp] = BIT(arr[tmp] &
> 0x07);
>  	}
>  
> +	clear_bit(QUIRKS_ONLY_USED, &pdata->quirks);
>  	return pdata;
>  }
>  #else
> diff --git a/include/linux/platform_data/dma-dw.h
> b/include/linux/platform_data/dma-dw.h
> index 5f0e11e..9cd8199 100644
> --- a/include/linux/platform_data/dma-dw.h
> +++ b/include/linux/platform_data/dma-dw.h
> @@ -37,10 +37,7 @@ struct dw_dma_slave {
>  /**
>   * struct dw_dma_platform_data - Controller configuration parameters
>   * @nr_channels: Number of channels supported by hardware (max 8)
> - * @is_private: The device channels should be marked as private and
> not for
> - *	by the general purpose DMA channel allocator.
> - * @is_memcpy: The device channels do support memory-to-memory
> transfers.
> - * @is_nollp: The device channels does not support multi block
> transfers.
> + * @quirks: Bit field with platform quirks
>   * @chan_allocation_order: Allocate channels starting from 0 or 7
>   * @chan_priority: Set channel priority increasing from 0 to 7 or 7
> to 0.
>   * @block_size: Maximum block size supported by the controller
> @@ -50,9 +47,18 @@ struct dw_dma_slave {
>   */
>  struct dw_dma_platform_data {
>  	unsigned int	nr_channels;
> -	bool		is_private;
> -	bool		is_memcpy;
> -	bool		is_nollp;
> +/* Only use quirks from platform data structure */
> +#define QUIRKS_ONLY_USED	0
> +/*
> + * The device channels should be marked as private and not for
> + * by the general purpose DMA channel allocator.
> + */
> +#define QUIRKS_IS_PRIVATE	1
> +/* The device channels do support memory-to-memory transfers. */
> +#define QUIRKS_IS_MEMCPY	2
> +/* The device channels do not support multi block transfers. */
> +#define QUIRKS_IS_NOLLP		3
> +	unsigned long	quirks;
>  #define CHAN_ALLOCATION_ASCENDING	0	/* zero to seven
> */
>  #define CHAN_ALLOCATION_DESCENDING	1	/* seven to zero
> */
>  	unsigned char	chan_allocation_order;
-- 
 Paltsev Eugeniy

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