mmci.c

来自「linux 内核源代码」· C语言 代码 · 共 712 行 · 第 1/2 页

	u32 status;
	int ret = 0;

	spin_lock(&host->lock);

	do {
		struct mmc_command *cmd;
		struct mmc_data *data;

		status = readl(host->base + MMCISTATUS);
		status &= readl(host->base + MMCIMASK0);
		writel(status, host->base + MMCICLEAR);

		DBG(host, "irq0 %08x\n", status);

		data = host->data;
		if (status & (MCI_DATACRCFAIL|MCI_DATATIMEOUT|MCI_TXUNDERRUN|
			      MCI_RXOVERRUN|MCI_DATAEND|MCI_DATABLOCKEND) && data)
			mmci_data_irq(host, data, status);

		cmd = host->cmd;
		if (status & (MCI_CMDCRCFAIL|MCI_CMDTIMEOUT|MCI_CMDSENT|MCI_CMDRESPEND) && cmd)
			mmci_cmd_irq(host, cmd, status);

		ret = 1;
	} while (status);

	spin_unlock(&host->lock);

	return IRQ_RETVAL(ret);
}

static void mmci_request(struct mmc_host *mmc, struct mmc_request *mrq)
{
	struct mmci_host *host = mmc_priv(mmc);

	WARN_ON(host->mrq != NULL);

	if (mrq->data && !is_power_of_2(mrq->data->blksz)) {
		printk(KERN_ERR "%s: Unsupported block size (%d bytes)\n",
			mmc_hostname(mmc), mrq->data->blksz);
		mrq->cmd->error = -EINVAL;
		mmc_request_done(mmc, mrq);
		return;
	}

	spin_lock_irq(&host->lock);

	host->mrq = mrq;

	if (mrq->data && mrq->data->flags & MMC_DATA_READ)
		mmci_start_data(host, mrq->data);

	mmci_start_command(host, mrq->cmd, 0);

	spin_unlock_irq(&host->lock);
}

static void mmci_set_ios(struct mmc_host *mmc, struct mmc_ios *ios)
{
	struct mmci_host *host = mmc_priv(mmc);
	u32 clk = 0, pwr = 0;

	if (ios->clock) {
		if (ios->clock >= host->mclk) {
			clk = MCI_CLK_BYPASS;
			host->cclk = host->mclk;
		} else {
			clk = host->mclk / (2 * ios->clock) - 1;
			if (clk > 256)
				clk = 255;
			host->cclk = host->mclk / (2 * (clk + 1));
		}
		clk |= MCI_CLK_ENABLE;
	}

	if (host->plat->translate_vdd)
		pwr |= host->plat->translate_vdd(mmc_dev(mmc), ios->vdd);

	switch (ios->power_mode) {
	case MMC_POWER_OFF:
		break;
	case MMC_POWER_UP:
		pwr |= MCI_PWR_UP;
		break;
	case MMC_POWER_ON:
		pwr |= MCI_PWR_ON;
		break;
	}

	if (ios->bus_mode == MMC_BUSMODE_OPENDRAIN)
		pwr |= MCI_ROD;

	writel(clk, host->base + MMCICLOCK);

	if (host->pwr != pwr) {
		host->pwr = pwr;
		writel(pwr, host->base + MMCIPOWER);
	}
}

static const struct mmc_host_ops mmci_ops = {
	.request	= mmci_request,
	.set_ios	= mmci_set_ios,
};

static void mmci_check_status(unsigned long data)
{
	struct mmci_host *host = (struct mmci_host *)data;
	unsigned int status;

	status = host->plat->status(mmc_dev(host->mmc));
	if (status ^ host->oldstat)
		mmc_detect_change(host->mmc, 0);

	host->oldstat = status;
	mod_timer(&host->timer, jiffies + HZ);
}

static int mmci_probe(struct amba_device *dev, void *id)
{
	struct mmc_platform_data *plat = dev->dev.platform_data;
	struct mmci_host *host;
	struct mmc_host *mmc;
	int ret;

	/* must have platform data */
	if (!plat) {
		ret = -EINVAL;
		goto out;
	}

	ret = amba_request_regions(dev, DRIVER_NAME);
	if (ret)
		goto out;

	mmc = mmc_alloc_host(sizeof(struct mmci_host), &dev->dev);
	if (!mmc) {
		ret = -ENOMEM;
		goto rel_regions;
	}

	host = mmc_priv(mmc);
	host->clk = clk_get(&dev->dev, "MCLK");
	if (IS_ERR(host->clk)) {
		ret = PTR_ERR(host->clk);
		host->clk = NULL;
		goto host_free;
	}

	ret = clk_enable(host->clk);
	if (ret)
		goto clk_free;

	host->plat = plat;
	host->mclk = clk_get_rate(host->clk);
	host->mmc = mmc;
	host->base = ioremap(dev->res.start, SZ_4K);
	if (!host->base) {
		ret = -ENOMEM;
		goto clk_disable;
	}

	mmc->ops = &mmci_ops;
	mmc->f_min = (host->mclk + 511) / 512;
	mmc->f_max = min(host->mclk, fmax);
	mmc->ocr_avail = plat->ocr_mask;
	mmc->caps = MMC_CAP_MULTIWRITE;

	/*
	 * We can do SGIO
	 */
	mmc->max_hw_segs = 16;
	mmc->max_phys_segs = NR_SG;

	/*
	 * Since we only have a 16-bit data length register, we must
	 * ensure that we don't exceed 2^16-1 bytes in a single request.
	 */
	mmc->max_req_size = 65535;

	/*
	 * Set the maximum segment size.  Since we aren't doing DMA
	 * (yet) we are only limited by the data length register.
	 */
	mmc->max_seg_size = mmc->max_req_size;

	/*
	 * Block size can be up to 2048 bytes, but must be a power of two.
	 */
	mmc->max_blk_size = 2048;

	/*
	 * No limit on the number of blocks transferred.
	 */
	mmc->max_blk_count = mmc->max_req_size;

	spin_lock_init(&host->lock);

	writel(0, host->base + MMCIMASK0);
	writel(0, host->base + MMCIMASK1);
	writel(0xfff, host->base + MMCICLEAR);

	ret = request_irq(dev->irq[0], mmci_irq, IRQF_SHARED, DRIVER_NAME " (cmd)", host);
	if (ret)
		goto unmap;

	ret = request_irq(dev->irq[1], mmci_pio_irq, IRQF_SHARED, DRIVER_NAME " (pio)", host);
	if (ret)
		goto irq0_free;

	writel(MCI_IRQENABLE, host->base + MMCIMASK0);

	amba_set_drvdata(dev, mmc);

	mmc_add_host(mmc);

	printk(KERN_INFO "%s: MMCI rev %x cfg %02x at 0x%016llx irq %d,%d\n",
		mmc_hostname(mmc), amba_rev(dev), amba_config(dev),
		(unsigned long long)dev->res.start, dev->irq[0], dev->irq[1]);

	init_timer(&host->timer);
	host->timer.data = (unsigned long)host;
	host->timer.function = mmci_check_status;
	host->timer.expires = jiffies + HZ;
	add_timer(&host->timer);

	return 0;

 irq0_free:
	free_irq(dev->irq[0], host);
 unmap:
	iounmap(host->base);
 clk_disable:
	clk_disable(host->clk);
 clk_free:
	clk_put(host->clk);
 host_free:
	mmc_free_host(mmc);
 rel_regions:
	amba_release_regions(dev);
 out:
	return ret;
}

static int mmci_remove(struct amba_device *dev)
{
	struct mmc_host *mmc = amba_get_drvdata(dev);

	amba_set_drvdata(dev, NULL);

	if (mmc) {
		struct mmci_host *host = mmc_priv(mmc);

		del_timer_sync(&host->timer);

		mmc_remove_host(mmc);

		writel(0, host->base + MMCIMASK0);
		writel(0, host->base + MMCIMASK1);

		writel(0, host->base + MMCICOMMAND);
		writel(0, host->base + MMCIDATACTRL);

		free_irq(dev->irq[0], host);
		free_irq(dev->irq[1], host);

		iounmap(host->base);
		clk_disable(host->clk);
		clk_put(host->clk);

		mmc_free_host(mmc);

		amba_release_regions(dev);
	}

	return 0;
}

#ifdef CONFIG_PM
static int mmci_suspend(struct amba_device *dev, pm_message_t state)
{
	struct mmc_host *mmc = amba_get_drvdata(dev);
	int ret = 0;

	if (mmc) {
		struct mmci_host *host = mmc_priv(mmc);

		ret = mmc_suspend_host(mmc, state);
		if (ret == 0)
			writel(0, host->base + MMCIMASK0);
	}

	return ret;
}

static int mmci_resume(struct amba_device *dev)
{
	struct mmc_host *mmc = amba_get_drvdata(dev);
	int ret = 0;

	if (mmc) {
		struct mmci_host *host = mmc_priv(mmc);

		writel(MCI_IRQENABLE, host->base + MMCIMASK0);

		ret = mmc_resume_host(mmc);
	}

	return ret;
}
#else
#define mmci_suspend	NULL
#define mmci_resume	NULL
#endif

static struct amba_id mmci_ids[] = {
	{
		.id	= 0x00041180,
		.mask	= 0x000fffff,
	},
	{
		.id	= 0x00041181,
		.mask	= 0x000fffff,
	},
	{ 0, 0 },
};

static struct amba_driver mmci_driver = {
	.drv		= {
		.name	= DRIVER_NAME,
	},
	.probe		= mmci_probe,
	.remove		= mmci_remove,
	.suspend	= mmci_suspend,
	.resume		= mmci_resume,
	.id_table	= mmci_ids,
};

static int __init mmci_init(void)
{
	return amba_driver_register(&mmci_driver);
}

static void __exit mmci_exit(void)
{
	amba_driver_unregister(&mmci_driver);
}

module_init(mmci_init);
module_exit(mmci_exit);
module_param(fmax, uint, 0444);

MODULE_DESCRIPTION("ARM PrimeCell PL180/181 Multimedia Card Interface driver");
MODULE_LICENSE("GPL");