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, 311 insertions, 0 deletions

diff --git a/kernel/drivers/mtd/nand/nuc900_nand.c b/kernel/drivers/mtd/nand/nuc900_nand.c
new file mode 100644
index 000000000..e58c644dd
--- /dev/null
+++ b/kernel/drivers/mtd/nand/nuc900_nand.c
@@ -0,0 +1,311 @@
+/*
+ * Copyright © 2009 Nuvoton technology corporation.
+ *
+ * Wan ZongShun <mcuos.com@gmail.com>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation;version 2 of the License.
+ *
+ */
+
+#include <linux/slab.h>
+#include <linux/module.h>
+#include <linux/interrupt.h>
+#include <linux/io.h>
+#include <linux/platform_device.h>
+#include <linux/delay.h>
+#include <linux/clk.h>
+#include <linux/err.h>
+
+#include <linux/mtd/mtd.h>
+#include <linux/mtd/nand.h>
+#include <linux/mtd/partitions.h>
+
+#define REG_FMICSR   	0x00
+#define REG_SMCSR    	0xa0
+#define REG_SMISR    	0xac
+#define REG_SMCMD    	0xb0
+#define REG_SMADDR   	0xb4
+#define REG_SMDATA   	0xb8
+
+#define RESET_FMI	0x01
+#define NAND_EN		0x08
+#define READYBUSY	(0x01 << 18)
+
+#define SWRST		0x01
+#define PSIZE		(0x01 << 3)
+#define DMARWEN		(0x03 << 1)
+#define BUSWID		(0x01 << 4)
+#define ECC4EN		(0x01 << 5)
+#define WP		(0x01 << 24)
+#define NANDCS		(0x01 << 25)
+#define ENDADDR		(0x01 << 31)
+
+#define read_data_reg(dev)		\
+	__raw_readl((dev)->reg + REG_SMDATA)
+
+#define write_data_reg(dev, val)	\
+	__raw_writel((val), (dev)->reg + REG_SMDATA)
+
+#define write_cmd_reg(dev, val)		\
+	__raw_writel((val), (dev)->reg + REG_SMCMD)
+
+#define write_addr_reg(dev, val)	\
+	__raw_writel((val), (dev)->reg + REG_SMADDR)
+
+struct nuc900_nand {
+	struct mtd_info mtd;
+	struct nand_chip chip;
+	void __iomem *reg;
+	struct clk *clk;
+	spinlock_t lock;
+};
+
+static const struct mtd_partition partitions[] = {
+	{
+	 .name = "NAND FS 0",
+	 .offset = 0,
+	 .size = 8 * 1024 * 1024
+	},
+	{
+	 .name = "NAND FS 1",
+	 .offset = MTDPART_OFS_APPEND,
+	 .size = MTDPART_SIZ_FULL
+	}
+};
+
+static unsigned char nuc900_nand_read_byte(struct mtd_info *mtd)
+{
+	unsigned char ret;
+	struct nuc900_nand *nand;
+
+	nand = container_of(mtd, struct nuc900_nand, mtd);
+
+	ret = (unsigned char)read_data_reg(nand);
+
+	return ret;
+}
+
+static void nuc900_nand_read_buf(struct mtd_info *mtd,
+				 unsigned char *buf, int len)
+{
+	int i;
+	struct nuc900_nand *nand;
+
+	nand = container_of(mtd, struct nuc900_nand, mtd);
+
+	for (i = 0; i < len; i++)
+		buf[i] = (unsigned char)read_data_reg(nand);
+}
+
+static void nuc900_nand_write_buf(struct mtd_info *mtd,
+				  const unsigned char *buf, int len)
+{
+	int i;
+	struct nuc900_nand *nand;
+
+	nand = container_of(mtd, struct nuc900_nand, mtd);
+
+	for (i = 0; i < len; i++)
+		write_data_reg(nand, buf[i]);
+}
+
+static int nuc900_check_rb(struct nuc900_nand *nand)
+{
+	unsigned int val;
+	spin_lock(&nand->lock);
+	val = __raw_readl(REG_SMISR);
+	val &= READYBUSY;
+	spin_unlock(&nand->lock);
+
+	return val;
+}
+
+static int nuc900_nand_devready(struct mtd_info *mtd)
+{
+	struct nuc900_nand *nand;
+	int ready;
+
+	nand = container_of(mtd, struct nuc900_nand, mtd);
+
+	ready = (nuc900_check_rb(nand)) ? 1 : 0;
+	return ready;
+}
+
+static void nuc900_nand_command_lp(struct mtd_info *mtd, unsigned int command,
+				   int column, int page_addr)
+{
+	register struct nand_chip *chip = mtd->priv;
+	struct nuc900_nand *nand;
+
+	nand = container_of(mtd, struct nuc900_nand, mtd);
+
+	if (command == NAND_CMD_READOOB) {
+		column += mtd->writesize;
+		command = NAND_CMD_READ0;
+	}
+
+	write_cmd_reg(nand, command & 0xff);
+
+	if (column != -1 || page_addr != -1) {
+
+		if (column != -1) {
+			if (chip->options & NAND_BUSWIDTH_16 &&
+					!nand_opcode_8bits(command))
+				column >>= 1;
+			write_addr_reg(nand, column);
+			write_addr_reg(nand, column >> 8 | ENDADDR);
+		}
+		if (page_addr != -1) {
+			write_addr_reg(nand, page_addr);
+
+			if (chip->chipsize > (128 << 20)) {
+				write_addr_reg(nand, page_addr >> 8);
+				write_addr_reg(nand, page_addr >> 16 | ENDADDR);
+			} else {
+				write_addr_reg(nand, page_addr >> 8 | ENDADDR);
+			}
+		}
+	}
+
+	switch (command) {
+	case NAND_CMD_CACHEDPROG:
+	case NAND_CMD_PAGEPROG:
+	case NAND_CMD_ERASE1:
+	case NAND_CMD_ERASE2:
+	case NAND_CMD_SEQIN:
+	case NAND_CMD_RNDIN:
+	case NAND_CMD_STATUS:
+		return;
+
+	case NAND_CMD_RESET:
+		if (chip->dev_ready)
+			break;
+		udelay(chip->chip_delay);
+
+		write_cmd_reg(nand, NAND_CMD_STATUS);
+		write_cmd_reg(nand, command);
+
+		while (!nuc900_check_rb(nand))
+			;
+
+		return;
+
+	case NAND_CMD_RNDOUT:
+		write_cmd_reg(nand, NAND_CMD_RNDOUTSTART);
+		return;
+
+	case NAND_CMD_READ0:
+
+		write_cmd_reg(nand, NAND_CMD_READSTART);
+	default:
+
+		if (!chip->dev_ready) {
+			udelay(chip->chip_delay);
+			return;
+		}
+	}
+
+	/* Apply this short delay always to ensure that we do wait tWB in
+	 * any case on any machine. */
+	ndelay(100);
+
+	while (!chip->dev_ready(mtd))
+		;
+}
+
+
+static void nuc900_nand_enable(struct nuc900_nand *nand)
+{
+	unsigned int val;
+	spin_lock(&nand->lock);
+	__raw_writel(RESET_FMI, (nand->reg + REG_FMICSR));
+
+	val = __raw_readl(nand->reg + REG_FMICSR);
+
+	if (!(val & NAND_EN))
+		__raw_writel(val | NAND_EN, nand->reg + REG_FMICSR);
+
+	val = __raw_readl(nand->reg + REG_SMCSR);
+
+	val &= ~(SWRST|PSIZE|DMARWEN|BUSWID|ECC4EN|NANDCS);
+	val |= WP;
+
+	__raw_writel(val, nand->reg + REG_SMCSR);
+
+	spin_unlock(&nand->lock);
+}
+
+static int nuc900_nand_probe(struct platform_device *pdev)
+{
+	struct nuc900_nand *nuc900_nand;
+	struct nand_chip *chip;
+	struct resource *res;
+
+	nuc900_nand = devm_kzalloc(&pdev->dev, sizeof(struct nuc900_nand),
+				   GFP_KERNEL);
+	if (!nuc900_nand)
+		return -ENOMEM;
+	chip = &(nuc900_nand->chip);
+
+	nuc900_nand->mtd.priv	= chip;
+	nuc900_nand->mtd.owner	= THIS_MODULE;
+	spin_lock_init(&nuc900_nand->lock);
+
+	nuc900_nand->clk = devm_clk_get(&pdev->dev, NULL);
+	if (IS_ERR(nuc900_nand->clk))
+		return -ENOENT;
+	clk_enable(nuc900_nand->clk);
+
+	chip->cmdfunc		= nuc900_nand_command_lp;
+	chip->dev_ready		= nuc900_nand_devready;
+	chip->read_byte		= nuc900_nand_read_byte;
+	chip->write_buf		= nuc900_nand_write_buf;
+	chip->read_buf		= nuc900_nand_read_buf;
+	chip->chip_delay	= 50;
+	chip->options		= 0;
+	chip->ecc.mode		= NAND_ECC_SOFT;
+
+	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+	nuc900_nand->reg = devm_ioremap_resource(&pdev->dev, res);
+	if (IS_ERR(nuc900_nand->reg))
+		return PTR_ERR(nuc900_nand->reg);
+
+	nuc900_nand_enable(nuc900_nand);
+
+	if (nand_scan(&(nuc900_nand->mtd), 1))
+		return -ENXIO;
+
+	mtd_device_register(&(nuc900_nand->mtd), partitions,
+			    ARRAY_SIZE(partitions));
+
+	platform_set_drvdata(pdev, nuc900_nand);
+
+	return 0;
+}
+
+static int nuc900_nand_remove(struct platform_device *pdev)
+{
+	struct nuc900_nand *nuc900_nand = platform_get_drvdata(pdev);
+
+	nand_release(&nuc900_nand->mtd);
+	clk_disable(nuc900_nand->clk);
+
+	return 0;
+}
+
+static struct platform_driver nuc900_nand_driver = {
+	.probe		= nuc900_nand_probe,
+	.remove		= nuc900_nand_remove,
+	.driver		= {
+		.name	= "nuc900-fmi",
+	},
+};
+
+module_platform_driver(nuc900_nand_driver);
+
+MODULE_AUTHOR("Wan ZongShun <mcuos.com@gmail.com>");
+MODULE_DESCRIPTION("w90p910/NUC9xx nand driver!");
+MODULE_LICENSE("GPL");
+MODULE_ALIAS("platform:nuc900-fmi");