[U-Boot] [PATCH v4 1/5] dma: lpc32xx: add DMA driver

[Marek Vasut]

On Tuesday, August 04, 2015 at 11:04:38 PM, slemieux.tyco at gmail.com wrote:
> From: Sylvain Lemieux <slemieux at tycoint.com>
> 
> Incorporate DMA driver from legacy LPCLinux NXP BSP.
> The files taken from the legacy patch are:
> - lpc32xx DMA driver
> - lpc3250 header file DMA registers definition.
> 
> The legacy driver was updated and clean-up as part of the integration with
> the latest u-boot.
> 
> Signed-off-by: Sylvain Lemieux <slemieux at tycoint.com>

[...]

> +
> +/*
> + * The "dmac_ll" structure is mapping the DMA channel register,
> + * as per UM10326, "LPC32x0 and LPC32x0/01 User manual" - Rev. 3
> + * tables 84, 85, 86 & 87.
> + *
> + * The DMA client (ex. NAND SLC) can use this macro to write the
> + * next DMA linked list item address.
> + */
> +#define lpc32xx_dmac_next_lli(x) (uint32_t)x

Ew, and it's not even used :-)

> +/* DMA linked list structure used with a channel's LLI register */
> +struct lpc32xx_dmac_ll {
> +	u32 dma_src;
> +	u32 dma_dest;
> +	u32 next_lli;
> +	u32 next_ctrl;
> +};

[...]

> +int lpc32xx_dma_wait_status(int channel)
> +{
> +	unsigned long start;
> +
> +	start = get_timer(0);
> +	while (1) {

Here , you can do

reg = readl();
reg |= readl();
if (reg & BIT_MASK())
    break;

> +		if (((readl(&dma->raw_tc_stat) | readl(dma->raw_err_stat))
> +		     & BIT_MASK(channel)) != 0)
> +			break;
> +
> +		if (get_timer(start) > 10000)
> +			return -1;
> +
> +		udelay(1);
> +	}
> +
> +	if (unlikely(readl(&dma->raw_err_stat) & BIT_MASK(channel))) {
> +		setbits_le32(&dma->int_err_clear, BIT_MASK(channel));
> +		setbits_le32(&dma->raw_err_stat, BIT_MASK(channel));
> +		return -1;
> +	}
> +	setbits_le32(&dma->int_tc_clear, BIT_MASK(channel));
> +	setbits_le32(&dma->raw_tc_stat, BIT_MASK(channel));
> +	return 0;
> +}

Other than that,

Acked-by: Marek Vasut <marex at denx.de>