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, 358 insertions, 0 deletions

diff --git a/kernel/drivers/scsi/arm/arxescsi.c b/kernel/drivers/scsi/arm/arxescsi.c
new file mode 100644
index 000000000..32d23212d
--- /dev/null
+++ b/kernel/drivers/scsi/arm/arxescsi.c
@@ -0,0 +1,358 @@
+/*
+ * linux/drivers/scsi/arm/arxescsi.c
+ *
+ * Copyright (C) 1997-2000 Russell King, Stefan Hanske
+ *
+ * This driver is based on experimentation.  Hence, it may have made
+ * assumptions about the particular card that I have available, and
+ * may not be reliable!
+ *
+ * Changelog:
+ *  30-08-1997	RMK	0.0.0	Created, READONLY version as cumana_2.c
+ *  22-01-1998	RMK	0.0.1	Updated to 2.1.80
+ *  15-04-1998	RMK	0.0.1	Only do PIO if FAS216 will allow it.
+ *  11-06-1998 	SH	0.0.2   Changed to support ARXE 16-bit SCSI card
+ *				enabled writing
+ *  01-01-2000	SH	0.1.0   Added *real* pseudo dma writing
+ *				(arxescsi_pseudo_dma_write)
+ *  02-04-2000	RMK	0.1.1	Updated for new error handling code.
+ *  22-10-2000  SH		Updated for new registering scheme.
+ */
+#include <linux/module.h>
+#include <linux/blkdev.h>
+#include <linux/kernel.h>
+#include <linux/string.h>
+#include <linux/ioport.h>
+#include <linux/proc_fs.h>
+#include <linux/unistd.h>
+#include <linux/stat.h>
+#include <linux/delay.h>
+#include <linux/init.h>
+#include <linux/interrupt.h>
+
+#include <asm/dma.h>
+#include <asm/io.h>
+#include <asm/ecard.h>
+
+#include "../scsi.h"
+#include <scsi/scsi_host.h>
+#include "fas216.h"
+
+struct arxescsi_info {
+	FAS216_Info		info;
+	struct expansion_card	*ec;
+	void __iomem		*base;
+};
+
+#define DMADATA_OFFSET	(0x200)
+
+#define DMASTAT_OFFSET	(0x600)
+#define DMASTAT_DRQ	(1 << 0)
+
+#define CSTATUS_IRQ	(1 << 0)
+
+#define VERSION "1.10 (23/01/2003 2.5.57)"
+
+/*
+ * Function: int arxescsi_dma_setup(host, SCpnt, direction, min_type)
+ * Purpose : initialises DMA/PIO
+ * Params  : host      - host
+ *	     SCpnt     - command
+ *	     direction - DMA on to/off of card
+ *	     min_type  - minimum DMA support that we must have for this transfer
+ * Returns : 0 if we should not set CMD_WITHDMA for transfer info command
+ */
+static fasdmatype_t
+arxescsi_dma_setup(struct Scsi_Host *host, struct scsi_pointer *SCp,
+		       fasdmadir_t direction, fasdmatype_t min_type)
+{
+	/*
+	 * We don't do real DMA
+	 */
+	return fasdma_pseudo;
+}
+
+static void arxescsi_pseudo_dma_write(unsigned char *addr, void __iomem *base)
+{
+       __asm__ __volatile__(
+       "               stmdb   sp!, {r0-r12}\n"
+       "               mov     r3, %0\n"
+       "               mov     r1, %1\n"
+       "               add     r2, r1, #512\n"
+       "               mov     r4, #256\n"
+       ".loop_1:       ldmia   r3!, {r6, r8, r10, r12}\n"
+       "               mov     r5, r6, lsl #16\n"
+       "               mov     r7, r8, lsl #16\n"
+       ".loop_2:       ldrb    r0, [r1, #1536]\n"
+       "               tst     r0, #1\n"
+       "               beq     .loop_2\n"
+       "               stmia   r2, {r5-r8}\n\t"
+       "               mov     r9, r10, lsl #16\n"
+       "               mov     r11, r12, lsl #16\n"
+       ".loop_3:       ldrb    r0, [r1, #1536]\n"
+       "               tst     r0, #1\n"
+       "               beq     .loop_3\n"
+       "               stmia   r2, {r9-r12}\n"
+       "               subs    r4, r4, #16\n"
+       "               bne     .loop_1\n"
+       "               ldmia   sp!, {r0-r12}\n"
+       :
+       : "r" (addr), "r" (base));
+}
+
+/*
+ * Function: int arxescsi_dma_pseudo(host, SCpnt, direction, transfer)
+ * Purpose : handles pseudo DMA
+ * Params  : host      - host
+ *	     SCpnt     - command
+ *	     direction - DMA on to/off of card
+ *	     transfer  - minimum number of bytes we expect to transfer
+ */
+static void
+arxescsi_dma_pseudo(struct Scsi_Host *host, struct scsi_pointer *SCp,
+		    fasdmadir_t direction, int transfer)
+{
+	struct arxescsi_info *info = (struct arxescsi_info *)host->hostdata;
+	unsigned int length, error = 0;
+	void __iomem *base = info->info.scsi.io_base;
+	unsigned char *addr;
+
+	length = SCp->this_residual;
+	addr = SCp->ptr;
+
+	if (direction == DMA_OUT) {
+		unsigned int word;
+		while (length > 256) {
+			if (readb(base + 0x80) & STAT_INT) {
+				error = 1;
+				break;
+			}
+			arxescsi_pseudo_dma_write(addr, base);
+			addr += 256;
+			length -= 256;
+		}
+
+		if (!error)
+			while (length > 0) {
+				if (readb(base + 0x80) & STAT_INT)
+					break;
+	 
+				if (!(readb(base + DMASTAT_OFFSET) & DMASTAT_DRQ))
+					continue;
+
+				word = *addr | *(addr + 1) << 8;
+
+				writew(word, base + DMADATA_OFFSET);
+				if (length > 1) {
+					addr += 2;
+					length -= 2;
+				} else {
+					addr += 1;
+					length -= 1;
+				}
+			}
+	}
+	else {
+		if (transfer && (transfer & 255)) {
+			while (length >= 256) {
+				if (readb(base + 0x80) & STAT_INT) {
+					error = 1;
+					break;
+				}
+	    
+				if (!(readb(base + DMASTAT_OFFSET) & DMASTAT_DRQ))
+					continue;
+
+				readsw(base + DMADATA_OFFSET, addr, 256 >> 1);
+				addr += 256;
+				length -= 256;
+			}
+		}
+
+		if (!(error))
+			while (length > 0) {
+				unsigned long word;
+
+				if (readb(base + 0x80) & STAT_INT)
+					break;
+
+				if (!(readb(base + DMASTAT_OFFSET) & DMASTAT_DRQ))
+					continue;
+
+				word = readw(base + DMADATA_OFFSET);
+				*addr++ = word;
+				if (--length > 0) {
+					*addr++ = word >> 8;
+					length --;
+				}
+			}
+	}
+}
+
+/*
+ * Function: int arxescsi_dma_stop(host, SCpnt)
+ * Purpose : stops DMA/PIO
+ * Params  : host  - host
+ *	     SCpnt - command
+ */
+static void arxescsi_dma_stop(struct Scsi_Host *host, struct scsi_pointer *SCp)
+{
+	/*
+	 * no DMA to stop
+	 */
+}
+
+/*
+ * Function: const char *arxescsi_info(struct Scsi_Host * host)
+ * Purpose : returns a descriptive string about this interface,
+ * Params  : host - driver host structure to return info for.
+ * Returns : pointer to a static buffer containing null terminated string.
+ */
+static const char *arxescsi_info(struct Scsi_Host *host)
+{
+	struct arxescsi_info *info = (struct arxescsi_info *)host->hostdata;
+	static char string[150];
+
+	sprintf(string, "%s (%s) in slot %d v%s",
+		host->hostt->name, info->info.scsi.type, info->ec->slot_no,
+		VERSION);
+
+	return string;
+}
+
+static int
+arxescsi_show_info(struct seq_file *m, struct Scsi_Host *host)
+{
+	struct arxescsi_info *info;
+	info = (struct arxescsi_info *)host->hostdata;
+
+	seq_printf(m, "ARXE 16-bit SCSI driver v%s\n", VERSION);
+	fas216_print_host(&info->info, m);
+	fas216_print_stats(&info->info, m);
+	fas216_print_devices(&info->info, m);
+	return 0;
+}
+
+static struct scsi_host_template arxescsi_template = {
+	.show_info			= arxescsi_show_info,
+	.name				= "ARXE SCSI card",
+	.info				= arxescsi_info,
+	.queuecommand			= fas216_noqueue_command,
+	.eh_host_reset_handler		= fas216_eh_host_reset,
+	.eh_bus_reset_handler		= fas216_eh_bus_reset,
+	.eh_device_reset_handler	= fas216_eh_device_reset,
+	.eh_abort_handler		= fas216_eh_abort,
+	.can_queue			= 0,
+	.this_id			= 7,
+	.sg_tablesize			= SG_ALL,
+	.cmd_per_lun			= 1,
+	.use_clustering			= DISABLE_CLUSTERING,
+	.proc_name			= "arxescsi",
+};
+
+static int arxescsi_probe(struct expansion_card *ec, const struct ecard_id *id)
+{
+	struct Scsi_Host *host;
+	struct arxescsi_info *info;
+	void __iomem *base;
+	int ret;
+
+	ret = ecard_request_resources(ec);
+	if (ret)
+		goto out;
+
+	base = ecardm_iomap(ec, ECARD_RES_MEMC, 0, 0);
+	if (!base) {
+		ret = -ENOMEM;
+		goto out_region;
+	}
+
+	host = scsi_host_alloc(&arxescsi_template, sizeof(struct arxescsi_info));
+	if (!host) {
+		ret = -ENOMEM;
+		goto out_region;
+	}
+
+	info = (struct arxescsi_info *)host->hostdata;
+	info->ec = ec;
+	info->base = base;
+
+	info->info.scsi.io_base		= base + 0x2000;
+	info->info.scsi.irq		= 0;
+	info->info.scsi.dma		= NO_DMA;
+	info->info.scsi.io_shift	= 5;
+	info->info.ifcfg.clockrate	= 24; /* MHz */
+	info->info.ifcfg.select_timeout = 255;
+	info->info.ifcfg.asyncperiod	= 200; /* ns */
+	info->info.ifcfg.sync_max_depth	= 0;
+	info->info.ifcfg.cntl3		= CNTL3_FASTSCSI | CNTL3_FASTCLK;
+	info->info.ifcfg.disconnect_ok	= 0;
+	info->info.ifcfg.wide_max_size	= 0;
+	info->info.ifcfg.capabilities	= FASCAP_PSEUDODMA;
+	info->info.dma.setup		= arxescsi_dma_setup;
+	info->info.dma.pseudo		= arxescsi_dma_pseudo;
+	info->info.dma.stop		= arxescsi_dma_stop;
+		
+	ec->irqaddr = base;
+	ec->irqmask = CSTATUS_IRQ;
+
+	ret = fas216_init(host);
+	if (ret)
+		goto out_unregister;
+
+	ret = fas216_add(host, &ec->dev);
+	if (ret == 0)
+		goto out;
+
+	fas216_release(host);
+ out_unregister:
+	scsi_host_put(host);
+ out_region:
+	ecard_release_resources(ec);
+ out:
+	return ret;
+}
+
+static void arxescsi_remove(struct expansion_card *ec)
+{
+	struct Scsi_Host *host = ecard_get_drvdata(ec);
+
+	ecard_set_drvdata(ec, NULL);
+	fas216_remove(host);
+
+	fas216_release(host);
+	scsi_host_put(host);
+	ecard_release_resources(ec);
+}
+
+static const struct ecard_id arxescsi_cids[] = {
+	{ MANU_ARXE, PROD_ARXE_SCSI },
+	{ 0xffff, 0xffff },
+};
+
+static struct ecard_driver arxescsi_driver = {
+	.probe		= arxescsi_probe,
+	.remove		= arxescsi_remove,
+	.id_table	= arxescsi_cids,
+	.drv = {
+		.name		= "arxescsi",
+	},
+};
+
+static int __init init_arxe_scsi_driver(void)
+{
+	return ecard_register_driver(&arxescsi_driver);
+}
+
+static void __exit exit_arxe_scsi_driver(void)
+{
+	ecard_remove_driver(&arxescsi_driver);
+}
+
+module_init(init_arxe_scsi_driver);
+module_exit(exit_arxe_scsi_driver);
+
+MODULE_AUTHOR("Stefan Hanske");
+MODULE_DESCRIPTION("ARXESCSI driver for Acorn machines");
+MODULE_LICENSE("GPL");
+