[RFC,2/6] dma: Add Synopsys eDMA IP version 0 support

[Eugeniy Paltsev <Eugeniy.Paltsev@synopsys.com>]

Hi Gustavo,

On Wed, 2018-12-12 at 12:13 +0100, Gustavo Pimentel wrote:
> Add support for the eDMA IP version 0 driver for both register maps (legacy
> and unroll).
[snip]
> diff --git a/drivers/dma/dw-edma/dw-edma-v0-core.c b/drivers/dma/dw-edma/dw-edma-v0-core.c
> new file mode 100644
> index 0000000..cc362b0
> --- /dev/null
> +++ b/drivers/dma/dw-edma/dw-edma-v0-core.c
> @@ -0,0 +1,346 @@
> +// SPDX-License-Identifier: GPL-2.0
> +// Copyright (c) 2018 Synopsys, Inc. and/or its affiliates.
> +// Synopsys DesignWare eDMA v0 core
> +
> +#include "dw-edma-core.h"
> +#include "dw-edma-v0-core.h"
> +#include "dw-edma-v0-regs.h"
> +#include "dw-edma-v0-debugfs.h"
> +
> +#define QWORD_HI(value)		((value & 0xFFFFFFFF00000000llu) >> 32)
Use upper_32_bits() macros.

> +#define QWORD_LO(value)		(value & 0x00000000FFFFFFFFllu)
Use lower_32_bits() macros.

> +enum dw_edma_control {
> +	DW_EDMA_CB		= BIT(0),
> +	DW_EDMA_TCB		= BIT(1),
> +	DW_EDMA_LLP		= BIT(2),
> +	DW_EDMA_LIE		= BIT(3),
> +	DW_EDMA_RIE		= BIT(4),


[snip]
> +		viewport_sel = (ch & 0x00000007ul);
[snip]
> +void dw_edma_v0_core_off(struct dw_edma *dw)
> +{
> +	SET_BOTH(dw, int_mask, 0x00FF00FFul);
> +	SET_BOTH(dw, int_clear, 0x00FF00FFul);
> +	SET_BOTH(dw, engine_en, 0x00000000ul);
> +}
[snip]
> +		num_ch &= 0x0000000Ful;
> +	} else {
> +		num_ch &= 0x000F0000ul;

I guess it's better to name this magic numbers via defines.


[snip]

> +
> +bool dw_edma_v0_core_status_done_int(struct dw_edma_chan *chan)
> +{
> +	struct dw_edma *dw = chan->chip->dw;
> +	u32 tmp;
> +
> +	tmp = GET_RW(dw, chan->dir, int_status);
> +	tmp &= BIT(chan->id);
> +
> +	return tmp ? true : false;

return !!tmp;

> +}
> +
> +bool dw_edma_v0_core_status_abort_int(struct dw_edma_chan *chan)
> +{
> +	struct dw_edma *dw = chan->chip->dw;
> +	u32 tmp;
> +
> +	tmp = GET_RW(dw, chan->dir, int_status);
> +	tmp &= BIT(chan->id + 16);
> +
> +	return tmp ? true : false;
ditto.

-- 
 Eugeniy Paltsev