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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