linux-kernel - Re: [PATCH v5] MMC: Add JZ4740 mmc driver

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Date:	Mon, 12 Jul 2010 15:45:10 -0700
From:	Joe Perches <joe@...ches.com>
To:	Lars-Peter Clausen <lars@...afoo.de>
Cc:	Ralf Baechle <ralf@...ux-mips.org>, linux-mips@...ux-mips.org,
	linux-kernel@...r.kernel.org,
	Andrew Morton <akpm@...ux-foundation.org>,
	Matt Fleming <matt@...sole-pimps.org>,
	linux-mmc@...r.kernel.org
Subject: Re: [PATCH v5] MMC: Add JZ4740 mmc driver

On Tue, 2010-07-13 at 00:20 +0200, Lars-Peter Clausen wrote:
> This patch adds support for the mmc controller on JZ4740 SoCs.
> +static bool jz4740_mmc_write_data(struct jz4740_mmc_host *host,
> +	struct mmc_data *data)
> +{
> +	struct sg_mapping_iter *miter = &host->miter;
> +	uint32_t *buf;
> +	bool timeout;
> +	size_t i, j;
> +
> +	while (sg_miter_next(miter)) {
> +		buf = miter->addr;
> +		i = miter->length / 4;
> +		j = i / 8;
> +		i = i & 0x7;
> +		while (j) {
> +			timeout = jz4740_mmc_poll_irq(host, JZ_MMC_IRQ_TXFIFO_WR_REQ);
> +			if (unlikely(timeout))
> +				goto poll_timeout;
> +
> +			writel(buf[0], host->base + JZ_REG_MMC_TXFIFO);

Perhaps it'd be better to use a temporary for
host->base + JZ_REG_MMC_TXFIFO

> +			writel(buf[1], host->base + JZ_REG_MMC_TXFIFO);
> +			writel(buf[2], host->base + JZ_REG_MMC_TXFIFO);
> +			writel(buf[3], host->base + JZ_REG_MMC_TXFIFO);
> +			writel(buf[4], host->base + JZ_REG_MMC_TXFIFO);
> +			writel(buf[5], host->base + JZ_REG_MMC_TXFIFO);
> +			writel(buf[6], host->base + JZ_REG_MMC_TXFIFO);
> +			writel(buf[7], host->base + JZ_REG_MMC_TXFIFO);
> +			buf += 8;
> +			--j;
> +		}
> +		if (unlikely(i)) {
> +			timeout = jz4740_mmc_poll_irq(host, JZ_MMC_IRQ_TXFIFO_WR_REQ);
> +			if (unlikely(timeout))
> +				goto poll_timeout;
> +
> +			while (i) {
> +				writel(*buf, host->base + JZ_REG_MMC_TXFIFO);
> +				++buf;
> +				--i;
> +			}
> +		}
> +		data->bytes_xfered += miter->length;
> +	}


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