pxamci.c

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		cmdat &= ~CMDAT_BUSY;
		cmdat |= CMDAT_DATAEN | CMDAT_DMAEN;
		if (mrq->data->flags & MMC_DATA_WRITE)
			cmdat |= CMDAT_WRITE;

		if (mrq->data->flags & MMC_DATA_STREAM)
			cmdat |= CMDAT_STREAM;
	}

	pxamci_start_cmd(host, mrq->cmd, cmdat);
}

static int pxamci_get_ro(struct mmc_host *mmc)
{
	struct pxamci_host *host = mmc_priv(mmc);

	if (host->pdata && host->pdata->get_ro)
		return host->pdata->get_ro(mmc_dev(mmc));
	/* Host doesn't support read only detection so assume writeable */
	return 0;
}

static void pxamci_set_ios(struct mmc_host *mmc, struct mmc_ios *ios)
{
	struct pxamci_host *host = mmc_priv(mmc);

	if (ios->clock) {
		unsigned long rate = host->clkrate;
		unsigned int clk = rate / ios->clock;

		if (host->clkrt == CLKRT_OFF)
			clk_enable(host->clk);

		/*
		 * clk might result in a lower divisor than we
		 * desire.  check for that condition and adjust
		 * as appropriate.
		 */
		if (rate / clk > ios->clock)
			clk <<= 1;
		host->clkrt = fls(clk) - 1;

		/*
		 * we write clkrt on the next command
		 */
	} else {
		pxamci_stop_clock(host);
		if (host->clkrt != CLKRT_OFF) {
			host->clkrt = CLKRT_OFF;
			clk_disable(host->clk);
		}
	}

	if (host->power_mode != ios->power_mode) {
		host->power_mode = ios->power_mode;

		if (host->pdata && host->pdata->setpower)
			host->pdata->setpower(mmc_dev(mmc), ios->vdd);

		if (ios->power_mode == MMC_POWER_ON)
			host->cmdat |= CMDAT_INIT;
	}

	if (ios->bus_width == MMC_BUS_WIDTH_4)
		host->cmdat |= CMDAT_SD_4DAT;
	else
		host->cmdat &= ~CMDAT_SD_4DAT;

	pr_debug("PXAMCI: clkrt = %x cmdat = %x\n",
		 host->clkrt, host->cmdat);
}

static void pxamci_enable_sdio_irq(struct mmc_host *host, int enable)
{
	struct pxamci_host *pxa_host = mmc_priv(host);

	if (enable)
		pxamci_enable_irq(pxa_host, SDIO_INT);
	else
		pxamci_disable_irq(pxa_host, SDIO_INT);
}

static const struct mmc_host_ops pxamci_ops = {
	.request		= pxamci_request,
	.get_ro			= pxamci_get_ro,
	.set_ios		= pxamci_set_ios,
	.enable_sdio_irq	= pxamci_enable_sdio_irq,
};

static void pxamci_dma_irq(int dma, void *devid)
{
	struct pxamci_host *host = devid;
	int dcsr = DCSR(dma);
	DCSR(dma) = dcsr & ~DCSR_STOPIRQEN;

	if (dcsr & DCSR_ENDINTR) {
		writel(BUF_PART_FULL, host->base + MMC_PRTBUF);
	} else {
		printk(KERN_ERR "%s: DMA error on channel %d (DCSR=%#x)\n",
		       mmc_hostname(host->mmc), dma, dcsr);
		host->data->error = -EIO;
		pxamci_data_done(host, 0);
	}
}

static irqreturn_t pxamci_detect_irq(int irq, void *devid)
{
	struct pxamci_host *host = mmc_priv(devid);

	mmc_detect_change(devid, host->pdata->detect_delay);
	return IRQ_HANDLED;
}

static int pxamci_probe(struct platform_device *pdev)
{
	struct mmc_host *mmc;
	struct pxamci_host *host = NULL;
	struct resource *r;
	int ret, irq;

	r = platform_get_resource(pdev, IORESOURCE_MEM, 0);
	irq = platform_get_irq(pdev, 0);
	if (!r || irq < 0)
		return -ENXIO;

	r = request_mem_region(r->start, SZ_4K, DRIVER_NAME);
	if (!r)
		return -EBUSY;

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

	mmc->ops = &pxamci_ops;

	/*
	 * We can do SG-DMA, but we don't because we never know how much
	 * data we successfully wrote to the card.
	 */
	mmc->max_phys_segs = NR_SG;

	/*
	 * Our hardware DMA can handle a maximum of one page per SG entry.
	 */
	mmc->max_seg_size = PAGE_SIZE;

	/*
	 * Block length register is only 10 bits before PXA27x.
	 */
	mmc->max_blk_size = (cpu_is_pxa21x() || cpu_is_pxa25x()) ? 1023 : 2048;

	/*
	 * Block count register is 16 bits.
	 */
	mmc->max_blk_count = 65535;

	host = mmc_priv(mmc);
	host->mmc = mmc;
	host->dma = -1;
	host->pdata = pdev->dev.platform_data;
	host->clkrt = CLKRT_OFF;

	host->clk = clk_get(&pdev->dev, "MMCCLK");
	if (IS_ERR(host->clk)) {
		ret = PTR_ERR(host->clk);
		host->clk = NULL;
		goto out;
	}

	host->clkrate = clk_get_rate(host->clk);

	/*
	 * Calculate minimum clock rate, rounding up.
	 */
	mmc->f_min = (host->clkrate + 63) / 64;
	mmc->f_max = host->clkrate;

	mmc->ocr_avail = host->pdata ?
			 host->pdata->ocr_mask :
			 MMC_VDD_32_33|MMC_VDD_33_34;
	mmc->caps = 0;
	host->cmdat = 0;
	if (!cpu_is_pxa21x() && !cpu_is_pxa25x()) {
		mmc->caps |= MMC_CAP_4_BIT_DATA | MMC_CAP_SDIO_IRQ;
		host->cmdat |= CMDAT_SDIO_INT_EN;
	}

	host->sg_cpu = dma_alloc_coherent(&pdev->dev, PAGE_SIZE, &host->sg_dma, GFP_KERNEL);
	if (!host->sg_cpu) {
		ret = -ENOMEM;
		goto out;
	}

	spin_lock_init(&host->lock);
	host->res = r;
	host->irq = irq;
	host->imask = MMC_I_MASK_ALL;

	host->base = ioremap(r->start, SZ_4K);
	if (!host->base) {
		ret = -ENOMEM;
		goto out;
	}

	/*
	 * Ensure that the host controller is shut down, and setup
	 * with our defaults.
	 */
	pxamci_stop_clock(host);
	writel(0, host->base + MMC_SPI);
	writel(64, host->base + MMC_RESTO);
	writel(host->imask, host->base + MMC_I_MASK);

	host->dma = pxa_request_dma(DRIVER_NAME, DMA_PRIO_LOW,
				    pxamci_dma_irq, host);
	if (host->dma < 0) {
		ret = -EBUSY;
		goto out;
	}

	ret = request_irq(host->irq, pxamci_irq, 0, DRIVER_NAME, host);
	if (ret)
		goto out;

	platform_set_drvdata(pdev, mmc);

	if (host->pdata && host->pdata->init)
		host->pdata->init(&pdev->dev, pxamci_detect_irq, mmc);

	mmc_add_host(mmc);

	return 0;

 out:
	if (host) {
		if (host->dma >= 0)
			pxa_free_dma(host->dma);
		if (host->base)
			iounmap(host->base);
		if (host->sg_cpu)
			dma_free_coherent(&pdev->dev, PAGE_SIZE, host->sg_cpu, host->sg_dma);
		if (host->clk)
			clk_put(host->clk);
	}
	if (mmc)
		mmc_free_host(mmc);
	release_resource(r);
	return ret;
}

static int pxamci_remove(struct platform_device *pdev)
{
	struct mmc_host *mmc = platform_get_drvdata(pdev);

	platform_set_drvdata(pdev, NULL);

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

		if (host->pdata && host->pdata->exit)
			host->pdata->exit(&pdev->dev, mmc);

		mmc_remove_host(mmc);

		pxamci_stop_clock(host);
		writel(TXFIFO_WR_REQ|RXFIFO_RD_REQ|CLK_IS_OFF|STOP_CMD|
		       END_CMD_RES|PRG_DONE|DATA_TRAN_DONE,
		       host->base + MMC_I_MASK);

		DRCMRRXMMC = 0;
		DRCMRTXMMC = 0;

		free_irq(host->irq, host);
		pxa_free_dma(host->dma);
		iounmap(host->base);
		dma_free_coherent(&pdev->dev, PAGE_SIZE, host->sg_cpu, host->sg_dma);

		clk_put(host->clk);

		release_resource(host->res);

		mmc_free_host(mmc);
	}
	return 0;
}

#ifdef CONFIG_PM
static int pxamci_suspend(struct platform_device *dev, pm_message_t state)
{
	struct mmc_host *mmc = platform_get_drvdata(dev);
	int ret = 0;

	if (mmc)
		ret = mmc_suspend_host(mmc, state);

	return ret;
}

static int pxamci_resume(struct platform_device *dev)
{
	struct mmc_host *mmc = platform_get_drvdata(dev);
	int ret = 0;

	if (mmc)
		ret = mmc_resume_host(mmc);

	return ret;
}
#else
#define pxamci_suspend	NULL
#define pxamci_resume	NULL
#endif

static struct platform_driver pxamci_driver = {
	.probe		= pxamci_probe,
	.remove		= pxamci_remove,
	.suspend	= pxamci_suspend,
	.resume		= pxamci_resume,
	.driver		= {
		.name	= DRIVER_NAME,
	},
};

static int __init pxamci_init(void)
{
	return platform_driver_register(&pxamci_driver);
}

static void __exit pxamci_exit(void)
{
	platform_driver_unregister(&pxamci_driver);
}

module_init(pxamci_init);
module_exit(pxamci_exit);

MODULE_DESCRIPTION("PXA Multimedia Card Interface Driver");
MODULE_LICENSE("GPL");