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Re: [PATCH v5] MMC: Add JZ4740 mmc driver

To: Joe Perches <joe@perches.com>
Subject: Re: [PATCH v5] MMC: Add JZ4740 mmc driver
From: Lars-Peter Clausen <lars@metafoo.de>
Date: Tue, 13 Jul 2010 01:45:43 +0200
Cc: Ralf Baechle <ralf@linux-mips.org>, linux-mips@linux-mips.org, linux-kernel@vger.kernel.org, Andrew Morton <akpm@linux-foundation.org>, Matt Fleming <matt@console-pimps.org>, linux-mmc@vger.kernel.org
In-reply-to: <1278974710.1501.317.camel@Joe-Laptop.home>
Original-recipient: rfc822;linux-mips@linux-mips.org
References: <1278970413-21617-1-git-send-email-lars@metafoo.de> <1278973245-25451-1-git-send-email-lars@metafoo.de> <1278974710.1501.317.camel@Joe-Laptop.home>
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Hi

Joe Perches wrote:
> 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
Hm, indeed host->addr is reloaded before each write.
> 
>> +                    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;
>> +    }
>  
> 

Thanks for reviewing
- Lars


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