Add the rt linux 4.1.3-rt3 as base

Import the rt linux 4.1.3-rt3 as OPNFV kvm base.

It's from git://git.kernel.org/pub/scm/linux/kernel/git/rt/linux-rt-devel.git linux-4.1.y-rt and
the base is:

commit 0917f823c59692d751951bf5ea699a2d1e2f26a2
Author: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Date:   Sat Jul 25 12:13:34 2015 +0200

    Prepare v4.1.3-rt3

    Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>

We lose all the git history this way and it's not good. We
should apply another opnfv project repo in future.

Change-Id: I87543d81c9df70d99c5001fbdf646b202c19f423
Signed-off-by: Yunhong Jiang <yunhong.jiang@intel.com>

1 files changed, 335 insertions, 0 deletions

diff --git a/kernel/drivers/ide/ide-dma-sff.c b/kernel/drivers/ide/ide-dma-sff.c
new file mode 100644
index 000000000..289d16c87
--- /dev/null
+++ b/kernel/drivers/ide/ide-dma-sff.c
@@ -0,0 +1,335 @@
+#include <linux/types.h>
+#include <linux/kernel.h>
+#include <linux/export.h>
+#include <linux/ide.h>
+#include <linux/scatterlist.h>
+#include <linux/dma-mapping.h>
+#include <linux/io.h>
+
+/**
+ *	config_drive_for_dma	-	attempt to activate IDE DMA
+ *	@drive: the drive to place in DMA mode
+ *
+ *	If the drive supports at least mode 2 DMA or UDMA of any kind
+ *	then attempt to place it into DMA mode. Drives that are known to
+ *	support DMA but predate the DMA properties or that are known
+ *	to have DMA handling bugs are also set up appropriately based
+ *	on the good/bad drive lists.
+ */
+
+int config_drive_for_dma(ide_drive_t *drive)
+{
+	ide_hwif_t *hwif = drive->hwif;
+	u16 *id = drive->id;
+
+	if (drive->media != ide_disk) {
+		if (hwif->host_flags & IDE_HFLAG_NO_ATAPI_DMA)
+			return 0;
+	}
+
+	/*
+	 * Enable DMA on any drive that has
+	 * UltraDMA (mode 0/1/2/3/4/5/6) enabled
+	 */
+	if ((id[ATA_ID_FIELD_VALID] & 4) &&
+	    ((id[ATA_ID_UDMA_MODES] >> 8) & 0x7f))
+		return 1;
+
+	/*
+	 * Enable DMA on any drive that has mode2 DMA
+	 * (multi or single) enabled
+	 */
+	if ((id[ATA_ID_MWDMA_MODES] & 0x404) == 0x404 ||
+	    (id[ATA_ID_SWDMA_MODES] & 0x404) == 0x404)
+		return 1;
+
+	/* Consult the list of known "good" drives */
+	if (ide_dma_good_drive(drive))
+		return 1;
+
+	return 0;
+}
+
+u8 ide_dma_sff_read_status(ide_hwif_t *hwif)
+{
+	unsigned long addr = hwif->dma_base + ATA_DMA_STATUS;
+
+	if (hwif->host_flags & IDE_HFLAG_MMIO)
+		return readb((void __iomem *)addr);
+	else
+		return inb(addr);
+}
+EXPORT_SYMBOL_GPL(ide_dma_sff_read_status);
+
+static void ide_dma_sff_write_status(ide_hwif_t *hwif, u8 val)
+{
+	unsigned long addr = hwif->dma_base + ATA_DMA_STATUS;
+
+	if (hwif->host_flags & IDE_HFLAG_MMIO)
+		writeb(val, (void __iomem *)addr);
+	else
+		outb(val, addr);
+}
+
+/**
+ *	ide_dma_host_set	-	Enable/disable DMA on a host
+ *	@drive: drive to control
+ *
+ *	Enable/disable DMA on an IDE controller following generic
+ *	bus-mastering IDE controller behaviour.
+ */
+
+void ide_dma_host_set(ide_drive_t *drive, int on)
+{
+	ide_hwif_t *hwif = drive->hwif;
+	u8 unit = drive->dn & 1;
+	u8 dma_stat = hwif->dma_ops->dma_sff_read_status(hwif);
+
+	if (on)
+		dma_stat |= (1 << (5 + unit));
+	else
+		dma_stat &= ~(1 << (5 + unit));
+
+	ide_dma_sff_write_status(hwif, dma_stat);
+}
+EXPORT_SYMBOL_GPL(ide_dma_host_set);
+
+/**
+ *	ide_build_dmatable	-	build IDE DMA table
+ *
+ *	ide_build_dmatable() prepares a dma request. We map the command
+ *	to get the pci bus addresses of the buffers and then build up
+ *	the PRD table that the IDE layer wants to be fed.
+ *
+ *	Most chipsets correctly interpret a length of 0x0000 as 64KB,
+ *	but at least one (e.g. CS5530) misinterprets it as zero (!).
+ *	So we break the 64KB entry into two 32KB entries instead.
+ *
+ *	Returns the number of built PRD entries if all went okay,
+ *	returns 0 otherwise.
+ *
+ *	May also be invoked from trm290.c
+ */
+
+int ide_build_dmatable(ide_drive_t *drive, struct ide_cmd *cmd)
+{
+	ide_hwif_t *hwif = drive->hwif;
+	__le32 *table = (__le32 *)hwif->dmatable_cpu;
+	unsigned int count = 0;
+	int i;
+	struct scatterlist *sg;
+	u8 is_trm290 = !!(hwif->host_flags & IDE_HFLAG_TRM290);
+
+	for_each_sg(hwif->sg_table, sg, cmd->sg_nents, i) {
+		u32 cur_addr, cur_len, xcount, bcount;
+
+		cur_addr = sg_dma_address(sg);
+		cur_len = sg_dma_len(sg);
+
+		/*
+		 * Fill in the dma table, without crossing any 64kB boundaries.
+		 * Most hardware requires 16-bit alignment of all blocks,
+		 * but the trm290 requires 32-bit alignment.
+		 */
+
+		while (cur_len) {
+			if (count++ >= PRD_ENTRIES)
+				goto use_pio_instead;
+
+			bcount = 0x10000 - (cur_addr & 0xffff);
+			if (bcount > cur_len)
+				bcount = cur_len;
+			*table++ = cpu_to_le32(cur_addr);
+			xcount = bcount & 0xffff;
+			if (is_trm290)
+				xcount = ((xcount >> 2) - 1) << 16;
+			else if (xcount == 0x0000) {
+				if (count++ >= PRD_ENTRIES)
+					goto use_pio_instead;
+				*table++ = cpu_to_le32(0x8000);
+				*table++ = cpu_to_le32(cur_addr + 0x8000);
+				xcount = 0x8000;
+			}
+			*table++ = cpu_to_le32(xcount);
+			cur_addr += bcount;
+			cur_len -= bcount;
+		}
+	}
+
+	if (count) {
+		if (!is_trm290)
+			*--table |= cpu_to_le32(0x80000000);
+		return count;
+	}
+
+use_pio_instead:
+	printk(KERN_ERR "%s: %s\n", drive->name,
+		count ? "DMA table too small" : "empty DMA table?");
+
+	return 0; /* revert to PIO for this request */
+}
+EXPORT_SYMBOL_GPL(ide_build_dmatable);
+
+/**
+ *	ide_dma_setup	-	begin a DMA phase
+ *	@drive: target device
+ *	@cmd: command
+ *
+ *	Build an IDE DMA PRD (IDE speak for scatter gather table)
+ *	and then set up the DMA transfer registers for a device
+ *	that follows generic IDE PCI DMA behaviour. Controllers can
+ *	override this function if they need to
+ *
+ *	Returns 0 on success. If a PIO fallback is required then 1
+ *	is returned.
+ */
+
+int ide_dma_setup(ide_drive_t *drive, struct ide_cmd *cmd)
+{
+	ide_hwif_t *hwif = drive->hwif;
+	u8 mmio = (hwif->host_flags & IDE_HFLAG_MMIO) ? 1 : 0;
+	u8 rw = (cmd->tf_flags & IDE_TFLAG_WRITE) ? 0 : ATA_DMA_WR;
+	u8 dma_stat;
+
+	/* fall back to pio! */
+	if (ide_build_dmatable(drive, cmd) == 0) {
+		ide_map_sg(drive, cmd);
+		return 1;
+	}
+
+	/* PRD table */
+	if (mmio)
+		writel(hwif->dmatable_dma,
+		       (void __iomem *)(hwif->dma_base + ATA_DMA_TABLE_OFS));
+	else
+		outl(hwif->dmatable_dma, hwif->dma_base + ATA_DMA_TABLE_OFS);
+
+	/* specify r/w */
+	if (mmio)
+		writeb(rw, (void __iomem *)(hwif->dma_base + ATA_DMA_CMD));
+	else
+		outb(rw, hwif->dma_base + ATA_DMA_CMD);
+
+	/* read DMA status for INTR & ERROR flags */
+	dma_stat = hwif->dma_ops->dma_sff_read_status(hwif);
+
+	/* clear INTR & ERROR flags */
+	ide_dma_sff_write_status(hwif, dma_stat | ATA_DMA_ERR | ATA_DMA_INTR);
+
+	return 0;
+}
+EXPORT_SYMBOL_GPL(ide_dma_setup);
+
+/**
+ *	ide_dma_sff_timer_expiry	-	handle a DMA timeout
+ *	@drive: Drive that timed out
+ *
+ *	An IDE DMA transfer timed out. In the event of an error we ask
+ *	the driver to resolve the problem, if a DMA transfer is still
+ *	in progress we continue to wait (arguably we need to add a
+ *	secondary 'I don't care what the drive thinks' timeout here)
+ *	Finally if we have an interrupt we let it complete the I/O.
+ *	But only one time - we clear expiry and if it's still not
+ *	completed after WAIT_CMD, we error and retry in PIO.
+ *	This can occur if an interrupt is lost or due to hang or bugs.
+ */
+
+int ide_dma_sff_timer_expiry(ide_drive_t *drive)
+{
+	ide_hwif_t *hwif = drive->hwif;
+	u8 dma_stat = hwif->dma_ops->dma_sff_read_status(hwif);
+
+	printk(KERN_WARNING "%s: %s: DMA status (0x%02x)\n",
+		drive->name, __func__, dma_stat);
+
+	if ((dma_stat & 0x18) == 0x18)	/* BUSY Stupid Early Timer !! */
+		return WAIT_CMD;
+
+	hwif->expiry = NULL;	/* one free ride for now */
+
+	if (dma_stat & ATA_DMA_ERR)	/* ERROR */
+		return -1;
+
+	if (dma_stat & ATA_DMA_ACTIVE)	/* DMAing */
+		return WAIT_CMD;
+
+	if (dma_stat & ATA_DMA_INTR)	/* Got an Interrupt */
+		return WAIT_CMD;
+
+	return 0;	/* Status is unknown -- reset the bus */
+}
+EXPORT_SYMBOL_GPL(ide_dma_sff_timer_expiry);
+
+void ide_dma_start(ide_drive_t *drive)
+{
+	ide_hwif_t *hwif = drive->hwif;
+	u8 dma_cmd;
+
+	/* Note that this is done *after* the cmd has
+	 * been issued to the drive, as per the BM-IDE spec.
+	 * The Promise Ultra33 doesn't work correctly when
+	 * we do this part before issuing the drive cmd.
+	 */
+	if (hwif->host_flags & IDE_HFLAG_MMIO) {
+		dma_cmd = readb((void __iomem *)(hwif->dma_base + ATA_DMA_CMD));
+		writeb(dma_cmd | ATA_DMA_START,
+		       (void __iomem *)(hwif->dma_base + ATA_DMA_CMD));
+	} else {
+		dma_cmd = inb(hwif->dma_base + ATA_DMA_CMD);
+		outb(dma_cmd | ATA_DMA_START, hwif->dma_base + ATA_DMA_CMD);
+	}
+}
+EXPORT_SYMBOL_GPL(ide_dma_start);
+
+/* returns 1 on error, 0 otherwise */
+int ide_dma_end(ide_drive_t *drive)
+{
+	ide_hwif_t *hwif = drive->hwif;
+	u8 dma_stat = 0, dma_cmd = 0;
+
+	/* stop DMA */
+	if (hwif->host_flags & IDE_HFLAG_MMIO) {
+		dma_cmd = readb((void __iomem *)(hwif->dma_base + ATA_DMA_CMD));
+		writeb(dma_cmd & ~ATA_DMA_START,
+		       (void __iomem *)(hwif->dma_base + ATA_DMA_CMD));
+	} else {
+		dma_cmd = inb(hwif->dma_base + ATA_DMA_CMD);
+		outb(dma_cmd & ~ATA_DMA_START, hwif->dma_base + ATA_DMA_CMD);
+	}
+
+	/* get DMA status */
+	dma_stat = hwif->dma_ops->dma_sff_read_status(hwif);
+
+	/* clear INTR & ERROR bits */
+	ide_dma_sff_write_status(hwif, dma_stat | ATA_DMA_ERR | ATA_DMA_INTR);
+
+#define CHECK_DMA_MASK (ATA_DMA_ACTIVE | ATA_DMA_ERR | ATA_DMA_INTR)
+
+	/* verify good DMA status */
+	if ((dma_stat & CHECK_DMA_MASK) != ATA_DMA_INTR)
+		return 0x10 | dma_stat;
+	return 0;
+}
+EXPORT_SYMBOL_GPL(ide_dma_end);
+
+/* returns 1 if dma irq issued, 0 otherwise */
+int ide_dma_test_irq(ide_drive_t *drive)
+{
+	ide_hwif_t *hwif = drive->hwif;
+	u8 dma_stat = hwif->dma_ops->dma_sff_read_status(hwif);
+
+	return (dma_stat & ATA_DMA_INTR) ? 1 : 0;
+}
+EXPORT_SYMBOL_GPL(ide_dma_test_irq);
+
+const struct ide_dma_ops sff_dma_ops = {
+	.dma_host_set		= ide_dma_host_set,
+	.dma_setup		= ide_dma_setup,
+	.dma_start		= ide_dma_start,
+	.dma_end		= ide_dma_end,
+	.dma_test_irq		= ide_dma_test_irq,
+	.dma_lost_irq		= ide_dma_lost_irq,
+	.dma_timer_expiry	= ide_dma_sff_timer_expiry,
+	.dma_sff_read_status	= ide_dma_sff_read_status,
+};
+EXPORT_SYMBOL_GPL(sff_dma_ops);