Merge remote branch 'arm/devel'

3 files changed, 216 insertions, 36 deletions

diff --git a/drivers/mmc/host/mmci.c b/drivers/mmc/host/mmci.c
index 87b4fc6c98c2..0814b88b44d6 100644
--- a/drivers/mmc/host/mmci.c
+++ b/drivers/mmc/host/mmci.c
@@ -19,6 +19,7 @@
 #include <linux/highmem.h>
 #include <linux/log2.h>
 #include <linux/mmc/host.h>
+#include <linux/mmc/card.h>
 #include <linux/amba/bus.h>
 #include <linux/clk.h>
 #include <linux/scatterlist.h>
@@ -45,6 +46,11 @@ static unsigned int fmax = 515633;
  *	      is asserted (likewise for RX)
  * @fifohalfsize: number of bytes that can be written when MCI_TXFIFOHALFEMPTY
  *		  is asserted (likewise for RX)
+ * @broken_blockend: the MCI_DATABLOCKEND is broken on the hardware
+ *		and will not work at all.
+ * @broken_blockend_dma: the MCI_DATABLOCKEND is broken on the hardware when
+ *		using DMA.
+ * @sdio: variant supports SDIO
  */
 struct variant_data {
 	unsigned int		clkreg;
@@ -52,6 +58,9 @@ struct variant_data {
 	unsigned int		datalength_bits;
 	unsigned int		fifosize;
 	unsigned int		fifohalfsize;
+	bool			broken_blockend;
+	bool			broken_blockend_dma;
+	bool			sdio;
 };
 
 static struct variant_data variant_arm = {
@@ -65,6 +74,8 @@ static struct variant_data variant_u300 = {
 	.fifohalfsize		= 8 * 4,
 	.clkreg_enable		= 1 << 13, /* HWFCEN */
 	.datalength_bits	= 16,
+	.broken_blockend_dma	= true,
+	.sdio			= true,
 };
 
 static struct variant_data variant_ux500 = {
@@ -73,6 +84,8 @@ static struct variant_data variant_ux500 = {
 	.clkreg			= MCI_CLK_ENABLE,
 	.clkreg_enable		= 1 << 14, /* HWFCEN */
 	.datalength_bits	= 24,
+	.broken_blockend	= true,
+	.sdio			= true,
 };
 /*
  * This must be called with host->lock held
@@ -129,10 +142,26 @@ mmci_request_end(struct mmci_host *host, struct mmc_request *mrq)
 	spin_lock(&host->lock);
 }
 
+static void mmci_set_mask1(struct mmci_host *host, unsigned int mask)
+{
+	void __iomem *base = host->base;
+
+	if (host->singleirq) {
+		unsigned int mask0 = readl(base + MMCIMASK0);
+
+		mask0 &= ~MCI_IRQ1MASK;
+		mask0 |= mask;
+
+		writel(mask0, base + MMCIMASK0);
+	}
+
+	writel(mask, base + MMCIMASK1);
+}
+
 static void mmci_stop_data(struct mmci_host *host)
 {
 	writel(0, host->base + MMCIDATACTRL);
-	writel(0, host->base + MMCIMASK1);
+	mmci_set_mask1(host, 0);
 	host->data = NULL;
 }
 
@@ -162,6 +191,8 @@ static void mmci_start_data(struct mmci_host *host, struct mmc_data *data)
 	host->data = data;
 	host->size = data->blksz * data->blocks;
 	host->data_xfered = 0;
+	host->blockend = false;
+	host->dataend = false;
 
 	mmci_init_sg(host, data);
 
@@ -196,9 +227,14 @@ static void mmci_start_data(struct mmci_host *host, struct mmc_data *data)
 		irqmask = MCI_TXFIFOHALFEMPTYMASK;
 	}
 
+	/* The ST Micro variants has a special bit to enable SDIO */
+	if (variant->sdio && host->mmc->card)
+		if (mmc_card_sdio(host->mmc->card))
+			datactrl |= MCI_ST_DPSM_SDIOEN;
+
 	writel(datactrl, base + MMCIDATACTRL);
 	writel(readl(base + MMCIMASK0) & ~MCI_DATAENDMASK, base + MMCIMASK0);
-	writel(irqmask, base + MMCIMASK1);
+	mmci_set_mask1(host, irqmask);
 }
 
 static void
@@ -233,20 +269,9 @@ static void
 mmci_data_irq(struct mmci_host *host, struct mmc_data *data,
 	      unsigned int status)
 {
-	if (status & MCI_DATABLOCKEND) {
-		host->data_xfered += data->blksz;
-#ifdef CONFIG_ARCH_U300
-		/*
-		 * On the U300 some signal or other is
-		 * badly routed so that a data write does
-		 * not properly terminate with a MCI_DATAEND
-		 * status flag. This quirk will make writes
-		 * work again.
-		 */
-		if (data->flags & MMC_DATA_WRITE)
-			status |= MCI_DATAEND;
-#endif
-	}
+	struct variant_data *variant = host->variant;
+
+	/* First check for errors */
 	if (status & (MCI_DATACRCFAIL|MCI_DATATIMEOUT|MCI_TXUNDERRUN|MCI_RXOVERRUN)) {
 		dev_dbg(mmc_dev(host->mmc), "MCI ERROR IRQ (status %08x)\n", status);
 		if (status & MCI_DATACRCFAIL)
@@ -255,7 +280,10 @@ mmci_data_irq(struct mmci_host *host, struct mmc_data *data,
 			data->error = -ETIMEDOUT;
 		else if (status & (MCI_TXUNDERRUN|MCI_RXOVERRUN))
 			data->error = -EIO;
-		status |= MCI_DATAEND;
+
+		/* Force-complete the transaction */
+		host->blockend = true;
+		host->dataend = true;
 
 		/*
 		 * We hit an error condition.  Ensure that any data
@@ -273,9 +301,64 @@ mmci_data_irq(struct mmci_host *host, struct mmc_data *data,
 			local_irq_restore(flags);
 		}
 	}
-	if (status & MCI_DATAEND) {
+
+	/*
+	 * On ARM variants in PIO mode, MCI_DATABLOCKEND
+	 * is always sent first, and we increase the
+	 * transfered number of bytes for that IRQ. Then
+	 * MCI_DATAEND follows and we conclude the transaction.
+	 *
+	 * On the Ux500 single-IRQ variant MCI_DATABLOCKEND
+	 * doesn't seem to immediately clear from the status,
+	 * so we can't use it keep count when only one irq is
+	 * used because the irq will hit for other reasons, and
+	 * then the flag is still up. So we use the MCI_DATAEND
+	 * IRQ at the end of the entire transfer because
+	 * MCI_DATABLOCKEND is broken.
+	 *
+	 * In the U300, the IRQs can arrive out-of-order,
+	 * e.g. MCI_DATABLOCKEND sometimes arrives after MCI_DATAEND,
+	 * so for this case we use the flags "blockend" and
+	 * "dataend" to make sure both IRQs have arrived before
+	 * concluding the transaction. (This does not apply
+	 * to the Ux500 which doesn't fire MCI_DATABLOCKEND
+	 * at all.) In DMA mode it suffers from the same problem
+	 * as the Ux500.
+	 */
+	if (status & MCI_DATABLOCKEND) {
+		/*
+		 * Just being a little over-cautious, we do not
+		 * use this progressive update if the hardware blockend
+		 * flag is unreliable: since it can stay high between
+		 * IRQs it will corrupt the transfer counter.
+		 */
+		if (!variant->broken_blockend)
+			host->data_xfered += data->blksz;
+		host->blockend = true;
+	}
+
+	if (status & MCI_DATAEND)
+		host->dataend = true;
+
+	/*
+	 * On variants with broken blockend we shall only wait for dataend,
+	 * on others we must sync with the blockend signal since they can
+	 * appear out-of-order.
+	 */
+	if (host->dataend && (host->blockend || variant->broken_blockend)) {
 		mmci_stop_data(host);
 
+		/* Reset these flags */
+		host->blockend = false;
+		host->dataend = false;
+
+		/*
+		 * Variants with broken blockend flags need to handle the
+		 * end of the entire transfer here.
+		 */
+		if (variant->broken_blockend && !data->error)
+			host->data_xfered += data->blksz * data->blocks;
+
 		if (!data->stop) {
 			mmci_request_end(host, data->mrq);
 		} else {
@@ -356,7 +439,32 @@ static int mmci_pio_write(struct mmci_host *host, char *buffer, unsigned int rem
 			 variant->fifosize : variant->fifohalfsize;
 		count = min(remain, maxcnt);
 
-		writesl(base + MMCIFIFO, ptr, count >> 2);
+		/*
+		 * The ST Micro variant for SDIO transfer sizes
+		 * less then 8 bytes should have clock H/W flow
+		 * control disabled.
+		 */
+		if (variant->sdio &&
+		    mmc_card_sdio(host->mmc->card)) {
+			if (count < 8)
+				writel(readl(host->base + MMCICLOCK) &
+					~variant->clkreg_enable,
+					host->base + MMCICLOCK);
+			else
+				writel(readl(host->base + MMCICLOCK) |
+					variant->clkreg_enable,
+					host->base + MMCICLOCK);
+		}
+
+		/*
+		 * SDIO especially may want to send something that is
+		 * not divisible by 4 (as opposed to card sectors
+		 * etc), and the FIFO only accept full 32-bit writes.
+		 * So compensate by adding +3 on the count, a single
+		 * byte become a 32bit write, 7 bytes will be two
+		 * 32bit writes etc.
+		 */
+		writesl(base + MMCIFIFO, ptr, (count + 3) >> 2);
 
 		ptr += count;
 		remain -= count;
@@ -437,7 +545,7 @@ static irqreturn_t mmci_pio_irq(int irq, void *dev_id)
 	 * "any data available" mode.
 	 */
 	if (status & MCI_RXACTIVE && host->size < variant->fifosize)
-		writel(MCI_RXDATAAVLBLMASK, base + MMCIMASK1);
+		mmci_set_mask1(host, MCI_RXDATAAVLBLMASK);
 
 	/*
 	 * If we run out of data, disable the data IRQs; this
@@ -446,7 +554,7 @@ static irqreturn_t mmci_pio_irq(int irq, void *dev_id)
 	 * stops us racing with our data end IRQ.
 	 */
 	if (host->size == 0) {
-		writel(0, base + MMCIMASK1);
+		mmci_set_mask1(host, 0);
 		writel(readl(base + MMCIMASK0) | MCI_DATAENDMASK, base + MMCIMASK0);
 	}
 
@@ -469,6 +577,14 @@ static irqreturn_t mmci_irq(int irq, void *dev_id)
 		struct mmc_data *data;
 
 		status = readl(host->base + MMCISTATUS);
+
+		if (host->singleirq) {
+			if (status & readl(host->base + MMCIMASK1))
+				mmci_pio_irq(irq, dev_id);
+
+			status &= ~MCI_IRQ1MASK;
+		}
+
 		status &= readl(host->base + MMCIMASK0);
 		writel(status, host->base + MMCICLEAR);
 
@@ -635,6 +751,7 @@ static int __devinit mmci_probe(struct amba_device *dev, struct amba_id *id)
 	struct variant_data *variant = id->data;
 	struct mmci_host *host;
 	struct mmc_host *mmc;
+	unsigned int mask;
 	int ret;
 
 	/* must have platform data */
@@ -806,11 +923,21 @@ static int __devinit mmci_probe(struct amba_device *dev, struct amba_id *id)
 	if (ret)
 		goto unmap;
 
-	ret = request_irq(dev->irq[1], mmci_pio_irq, IRQF_SHARED, DRIVER_NAME " (pio)", host);
-	if (ret)
-		goto irq0_free;
+	if (dev->irq[1] == NO_IRQ)
+		host->singleirq = true;
+	else {
+		ret = request_irq(dev->irq[1], mmci_pio_irq, IRQF_SHARED,
+				  DRIVER_NAME " (pio)", host);
+		if (ret)
+			goto irq0_free;
+	}
+
+	mask = MCI_IRQENABLE;
+	/* Don't use the datablockend flag if it's broken */
+	if (variant->broken_blockend)
+		mask &= ~MCI_DATABLOCKEND;
 
-	writel(MCI_IRQENABLE, host->base + MMCIMASK0);
+	writel(mask, host->base + MMCIMASK0);
 
 	amba_set_drvdata(dev, mmc);
 
@@ -864,7 +991,8 @@ static int __devexit mmci_remove(struct amba_device *dev)
 		writel(0, host->base + MMCIDATACTRL);
 
 		free_irq(dev->irq[0], host);
-		free_irq(dev->irq[1], host);
+		if (!host->singleirq)
+			free_irq(dev->irq[1], host);
 
 		if (host->gpio_wp != -ENOSYS)
 			gpio_free(host->gpio_wp);
diff --git a/drivers/mmc/host/mmci.h b/drivers/mmc/host/mmci.h
index 4ae887fc0189..df06f01aac89 100644
--- a/drivers/mmc/host/mmci.h
+++ b/drivers/mmc/host/mmci.h
@@ -139,6 +139,11 @@
 	MCI_DATATIMEOUTMASK|MCI_TXUNDERRUNMASK|MCI_RXOVERRUNMASK|	\
 	MCI_CMDRESPENDMASK|MCI_CMDSENTMASK|MCI_DATABLOCKENDMASK)
 
+/* These interrupts are directed to IRQ1 when two IRQ lines are available */
+#define MCI_IRQ1MASK \
+	(MCI_RXFIFOHALFFULLMASK | MCI_RXDATAAVLBLMASK | \
+	 MCI_TXFIFOHALFEMPTYMASK)
+
 #define NR_SG		16
 
 struct clk;
@@ -154,6 +159,7 @@ struct mmci_host {
 	int			gpio_cd;
 	int			gpio_wp;
 	int			gpio_cd_irq;
+	bool			singleirq;
 
 	unsigned int		data_xfered;
 
@@ -171,6 +177,9 @@ struct mmci_host {
 	struct timer_list	timer;
 	unsigned int		oldstat;
 
+	bool			blockend;
+	bool			dataend;
+
 	/* pio stuff */
 	struct sg_mapping_iter	sg_miter;
 	unsigned int		size;
diff --git a/drivers/rtc/rtc-sa1100.c b/drivers/rtc/rtc-sa1100.c
index e4a44b641702..b0985f727078 100644
--- a/drivers/rtc/rtc-sa1100.c
+++ b/drivers/rtc/rtc-sa1100.c
@@ -39,7 +39,7 @@
 #include <mach/regs-ost.h>
 #endif
 
-#define RTC_DEF_DIVIDER		32768 - 1
+#define RTC_DEF_DIVIDER		(32768 - 1)
 #define RTC_DEF_TRIM		0
 
 static unsigned long rtc_freq = 1024;
@@ -61,7 +61,8 @@ static inline int rtc_periodic_alarm(struct rtc_time *tm)
  * Calculate the next alarm time given the requested alarm time mask
  * and the current time.
  */
-static void rtc_next_alarm_time(struct rtc_time *next, struct rtc_time *now, struct rtc_time *alrm)
+static void rtc_next_alarm_time(struct rtc_time *next, struct rtc_time *now,
+	struct rtc_time *alrm)
 {
 	unsigned long next_time;
 	unsigned long now_time;
@@ -116,7 +117,23 @@ static irqreturn_t sa1100_rtc_interrupt(int irq, void *dev_id)
 	rtsr = RTSR;
 	/* clear interrupt sources */
 	RTSR = 0;
-	RTSR = (RTSR_AL | RTSR_HZ) & (rtsr >> 2);
+	/* Fix for a nasty initialization problem the in SA11xx RTSR register.
+	 * See also the comments in sa1100_rtc_probe(). */
+	if (rtsr & (RTSR_ALE | RTSR_HZE)) {
+		/* This is the original code, before there was the if test
+		 * above. This code does not clear interrupts that were not
+		 * enabled. */
+		RTSR = (RTSR_AL | RTSR_HZ) & (rtsr >> 2);
+	} else {
+		/* For some reason, it is possible to enter this routine
+		 * without interruptions enabled, it has been tested with
+		 * several units (Bug in SA11xx chip?).
+		 *
+		 * This situation leads to an infinite "loop" of interrupt
+		 * routine calling and as a result the processor seems to
+		 * lock on its first call to open(). */
+		RTSR = RTSR_AL | RTSR_HZ;
+	}
 
 	/* clear alarm interrupt if it has occurred */
 	if (rtsr & RTSR_AL)
@@ -178,7 +195,7 @@ static int sa1100_rtc_read_callback(struct device *dev, int data)
 		 * Here we compare (match - OSCR) 8 instead of 0 --
 		 * see comment in pxa_timer_interrupt() for explanation.
 		 */
-		while( (signed long)((osmr1 = OSMR1) - OSCR) <= 8 ) {
+		while ((signed long)((osmr1 = OSMR1) - OSCR) <= 8) {
 			data += 0x100;
 			OSSR = OSSR_M1;	/* clear match on timer 1 */
 			OSMR1 = osmr1 + period;
@@ -192,19 +209,19 @@ static int sa1100_rtc_open(struct device *dev)
 	int ret;
 
 	ret = request_irq(IRQ_RTC1Hz, sa1100_rtc_interrupt, IRQF_DISABLED,
-				"rtc 1Hz", dev);
+		"rtc 1Hz", dev);
 	if (ret) {
 		dev_err(dev, "IRQ %d already in use.\n", IRQ_RTC1Hz);
 		goto fail_ui;
 	}
 	ret = request_irq(IRQ_RTCAlrm, sa1100_rtc_interrupt, IRQF_DISABLED,
-				"rtc Alrm", dev);
+		"rtc Alrm", dev);
 	if (ret) {
 		dev_err(dev, "IRQ %d already in use.\n", IRQ_RTCAlrm);
 		goto fail_ai;
 	}
 	ret = request_irq(IRQ_OST1, timer1_interrupt, IRQF_DISABLED,
-				"rtc timer", dev);
+		"rtc timer", dev);
 	if (ret) {
 		dev_err(dev, "IRQ %d already in use.\n", IRQ_OST1);
 		goto fail_pi;
@@ -236,7 +253,7 @@ static void sa1100_rtc_release(struct device *dev)
 static int sa1100_rtc_ioctl(struct device *dev, unsigned int cmd,
 		unsigned long arg)
 {
-	switch(cmd) {
+	switch (cmd) {
 	case RTC_AIE_OFF:
 		spin_lock_irq(&sa1100_rtc_lock);
 		RTSR &= ~RTSR_ALE;
@@ -333,6 +350,7 @@ static int sa1100_rtc_proc(struct device *dev, struct seq_file *seq)
 	seq_printf(seq, "periodic_IRQ\t: %s\n",
 			(OIER & OIER_E1) ? "yes" : "no");
 	seq_printf(seq, "periodic_freq\t: %ld\n", rtc_freq);
+	seq_printf(seq, "RTSR\t\t: 0x%08x\n", (u32)RTSR);
 
 	return 0;
 }
@@ -364,7 +382,8 @@ static int sa1100_rtc_probe(struct platform_device *pdev)
 	 */
 	if (RTTR == 0) {
 		RTTR = RTC_DEF_DIVIDER + (RTC_DEF_TRIM << 16);
-		dev_warn(&pdev->dev, "warning: initializing default clock divider/trim value\n");
+		dev_warn(&pdev->dev, "warning: "
+			"initializing default clock divider/trim value\n");
 		/* The current RTC value probably doesn't make sense either */
 		RCNR = 0;
 	}
@@ -379,6 +398,30 @@ static int sa1100_rtc_probe(struct platform_device *pdev)
 
 	platform_set_drvdata(pdev, rtc);
 
+	/* Fix for a nasty initialization problem the in SA11xx RTSR register.
+	 * See also the comments in sa1100_rtc_interrupt().
+	 *
+	 * Sometimes bit 1 of the RTSR (RTSR_HZ) will wake up 1, which means an
+	 * interrupt pending, even though interrupts were never enabled.
+	 * In this case, this bit it must be reset before enabling
+	 * interruptions to avoid a nonexistent interrupt to occur.
+	 *
+	 * In principle, the same problem would apply to bit 0, although it has
+	 * never been observed to happen.
+	 *
+	 * This issue is addressed both here and in sa1100_rtc_interrupt().
+	 * If the issue is not addressed here, in the times when the processor
+	 * wakes up with the bit set there will be one spurious interrupt.
+	 *
+	 * The issue is also dealt with in sa1100_rtc_interrupt() to be on the
+	 * safe side, once the condition that lead to this strange
+	 * initialization is unknown and could in principle happen during
+	 * normal processing.
+	 *
+	 * Notice that clearing bit 1 and 0 is accomplished by writting ONES to
+	 * the corresponding bits in RTSR. */
+	RTSR = RTSR_AL | RTSR_HZ;
+
 	return 0;
 }
 
@@ -386,7 +429,7 @@ static int sa1100_rtc_remove(struct platform_device *pdev)
 {
 	struct rtc_device *rtc = platform_get_drvdata(pdev);
 
- 	if (rtc)
+	if (rtc)
 		rtc_device_unregister(rtc);
 
 	return 0;