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, 269 insertions, 0 deletions

diff --git a/kernel/drivers/mmc/host/sdhci-pxav2.c b/kernel/drivers/mmc/host/sdhci-pxav2.c
new file mode 100644
index 000000000..f98008b5e
--- /dev/null
+++ b/kernel/drivers/mmc/host/sdhci-pxav2.c
@@ -0,0 +1,269 @@
+/*
+ * Copyright (C) 2010 Marvell International Ltd.
+ *		Zhangfei Gao <zhangfei.gao@marvell.com>
+ *		Kevin Wang <dwang4@marvell.com>
+ *		Jun Nie <njun@marvell.com>
+ *		Qiming Wu <wuqm@marvell.com>
+ *		Philip Rakity <prakity@marvell.com>
+ *
+ * This software is licensed under the terms of the GNU General Public
+ * License version 2, as published by the Free Software Foundation, and
+ * may be copied, distributed, and modified under those terms.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ */
+
+#include <linux/err.h>
+#include <linux/init.h>
+#include <linux/platform_device.h>
+#include <linux/clk.h>
+#include <linux/module.h>
+#include <linux/io.h>
+#include <linux/gpio.h>
+#include <linux/mmc/card.h>
+#include <linux/mmc/host.h>
+#include <linux/platform_data/pxa_sdhci.h>
+#include <linux/slab.h>
+#include <linux/of.h>
+#include <linux/of_device.h>
+
+#include "sdhci.h"
+#include "sdhci-pltfm.h"
+
+#define SD_FIFO_PARAM		0xe0
+#define DIS_PAD_SD_CLK_GATE	0x0400 /* Turn on/off Dynamic SD Clock Gating */
+#define CLK_GATE_ON		0x0200 /* Disable/enable Clock Gate */
+#define CLK_GATE_CTL		0x0100 /* Clock Gate Control */
+#define CLK_GATE_SETTING_BITS	(DIS_PAD_SD_CLK_GATE | \
+		CLK_GATE_ON | CLK_GATE_CTL)
+
+#define SD_CLOCK_BURST_SIZE_SETUP	0xe6
+#define SDCLK_SEL_SHIFT		8
+#define SDCLK_SEL_MASK		0x3
+#define SDCLK_DELAY_SHIFT	10
+#define SDCLK_DELAY_MASK	0x3c
+
+#define SD_CE_ATA_2		0xea
+#define MMC_CARD		0x1000
+#define MMC_WIDTH		0x0100
+
+static void pxav2_reset(struct sdhci_host *host, u8 mask)
+{
+	struct platform_device *pdev = to_platform_device(mmc_dev(host->mmc));
+	struct sdhci_pxa_platdata *pdata = pdev->dev.platform_data;
+
+	sdhci_reset(host, mask);
+
+	if (mask == SDHCI_RESET_ALL) {
+		u16 tmp = 0;
+
+		/*
+		 * tune timing of read data/command when crc error happen
+		 * no performance impact
+		 */
+		if (pdata && pdata->clk_delay_sel == 1) {
+			tmp = readw(host->ioaddr + SD_CLOCK_BURST_SIZE_SETUP);
+
+			tmp &= ~(SDCLK_DELAY_MASK << SDCLK_DELAY_SHIFT);
+			tmp |= (pdata->clk_delay_cycles & SDCLK_DELAY_MASK)
+				<< SDCLK_DELAY_SHIFT;
+			tmp &= ~(SDCLK_SEL_MASK << SDCLK_SEL_SHIFT);
+			tmp |= (1 & SDCLK_SEL_MASK) << SDCLK_SEL_SHIFT;
+
+			writew(tmp, host->ioaddr + SD_CLOCK_BURST_SIZE_SETUP);
+		}
+
+		if (pdata && (pdata->flags & PXA_FLAG_ENABLE_CLOCK_GATING)) {
+			tmp = readw(host->ioaddr + SD_FIFO_PARAM);
+			tmp &= ~CLK_GATE_SETTING_BITS;
+			writew(tmp, host->ioaddr + SD_FIFO_PARAM);
+		} else {
+			tmp = readw(host->ioaddr + SD_FIFO_PARAM);
+			tmp &= ~CLK_GATE_SETTING_BITS;
+			tmp |= CLK_GATE_SETTING_BITS;
+			writew(tmp, host->ioaddr + SD_FIFO_PARAM);
+		}
+	}
+}
+
+static void pxav2_mmc_set_bus_width(struct sdhci_host *host, int width)
+{
+	u8 ctrl;
+	u16 tmp;
+
+	ctrl = readb(host->ioaddr + SDHCI_HOST_CONTROL);
+	tmp = readw(host->ioaddr + SD_CE_ATA_2);
+	if (width == MMC_BUS_WIDTH_8) {
+		ctrl &= ~SDHCI_CTRL_4BITBUS;
+		tmp |= MMC_CARD | MMC_WIDTH;
+	} else {
+		tmp &= ~(MMC_CARD | MMC_WIDTH);
+		if (width == MMC_BUS_WIDTH_4)
+			ctrl |= SDHCI_CTRL_4BITBUS;
+		else
+			ctrl &= ~SDHCI_CTRL_4BITBUS;
+	}
+	writew(tmp, host->ioaddr + SD_CE_ATA_2);
+	writeb(ctrl, host->ioaddr + SDHCI_HOST_CONTROL);
+}
+
+static const struct sdhci_ops pxav2_sdhci_ops = {
+	.set_clock     = sdhci_set_clock,
+	.get_max_clock = sdhci_pltfm_clk_get_max_clock,
+	.set_bus_width = pxav2_mmc_set_bus_width,
+	.reset         = pxav2_reset,
+	.set_uhs_signaling = sdhci_set_uhs_signaling,
+};
+
+#ifdef CONFIG_OF
+static const struct of_device_id sdhci_pxav2_of_match[] = {
+	{
+		.compatible = "mrvl,pxav2-mmc",
+	},
+	{},
+};
+MODULE_DEVICE_TABLE(of, sdhci_pxav2_of_match);
+
+static struct sdhci_pxa_platdata *pxav2_get_mmc_pdata(struct device *dev)
+{
+	struct sdhci_pxa_platdata *pdata;
+	struct device_node *np = dev->of_node;
+	u32 bus_width;
+	u32 clk_delay_cycles;
+
+	pdata = devm_kzalloc(dev, sizeof(*pdata), GFP_KERNEL);
+	if (!pdata)
+		return NULL;
+
+	if (of_find_property(np, "non-removable", NULL))
+		pdata->flags |= PXA_FLAG_CARD_PERMANENT;
+
+	of_property_read_u32(np, "bus-width", &bus_width);
+	if (bus_width == 8)
+		pdata->flags |= PXA_FLAG_SD_8_BIT_CAPABLE_SLOT;
+
+	of_property_read_u32(np, "mrvl,clk-delay-cycles", &clk_delay_cycles);
+	if (clk_delay_cycles > 0) {
+		pdata->clk_delay_sel = 1;
+		pdata->clk_delay_cycles = clk_delay_cycles;
+	}
+
+	return pdata;
+}
+#else
+static inline struct sdhci_pxa_platdata *pxav2_get_mmc_pdata(struct device *dev)
+{
+	return NULL;
+}
+#endif
+
+static int sdhci_pxav2_probe(struct platform_device *pdev)
+{
+	struct sdhci_pltfm_host *pltfm_host;
+	struct sdhci_pxa_platdata *pdata = pdev->dev.platform_data;
+	struct device *dev = &pdev->dev;
+	struct sdhci_host *host = NULL;
+	const struct of_device_id *match;
+
+	int ret;
+	struct clk *clk;
+
+	host = sdhci_pltfm_init(pdev, NULL, 0);
+	if (IS_ERR(host))
+		return PTR_ERR(host);
+
+	pltfm_host = sdhci_priv(host);
+	pltfm_host->priv = NULL;
+
+	clk = clk_get(dev, "PXA-SDHCLK");
+	if (IS_ERR(clk)) {
+		dev_err(dev, "failed to get io clock\n");
+		ret = PTR_ERR(clk);
+		goto err_clk_get;
+	}
+	pltfm_host->clk = clk;
+	clk_prepare_enable(clk);
+
+	host->quirks = SDHCI_QUIRK_BROKEN_ADMA
+		| SDHCI_QUIRK_BROKEN_TIMEOUT_VAL
+		| SDHCI_QUIRK_CAP_CLOCK_BASE_BROKEN;
+
+	match = of_match_device(of_match_ptr(sdhci_pxav2_of_match), &pdev->dev);
+	if (match) {
+		pdata = pxav2_get_mmc_pdata(dev);
+	}
+	if (pdata) {
+		if (pdata->flags & PXA_FLAG_CARD_PERMANENT) {
+			/* on-chip device */
+			host->quirks |= SDHCI_QUIRK_BROKEN_CARD_DETECTION;
+			host->mmc->caps |= MMC_CAP_NONREMOVABLE;
+		}
+
+		/* If slot design supports 8 bit data, indicate this to MMC. */
+		if (pdata->flags & PXA_FLAG_SD_8_BIT_CAPABLE_SLOT)
+			host->mmc->caps |= MMC_CAP_8_BIT_DATA;
+
+		if (pdata->quirks)
+			host->quirks |= pdata->quirks;
+		if (pdata->host_caps)
+			host->mmc->caps |= pdata->host_caps;
+		if (pdata->pm_caps)
+			host->mmc->pm_caps |= pdata->pm_caps;
+	}
+
+	host->ops = &pxav2_sdhci_ops;
+
+	ret = sdhci_add_host(host);
+	if (ret) {
+		dev_err(&pdev->dev, "failed to add host\n");
+		goto err_add_host;
+	}
+
+	platform_set_drvdata(pdev, host);
+
+	return 0;
+
+err_add_host:
+	clk_disable_unprepare(clk);
+	clk_put(clk);
+err_clk_get:
+	sdhci_pltfm_free(pdev);
+	return ret;
+}
+
+static int sdhci_pxav2_remove(struct platform_device *pdev)
+{
+	struct sdhci_host *host = platform_get_drvdata(pdev);
+	struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
+
+	sdhci_remove_host(host, 1);
+
+	clk_disable_unprepare(pltfm_host->clk);
+	clk_put(pltfm_host->clk);
+	sdhci_pltfm_free(pdev);
+
+	return 0;
+}
+
+static struct platform_driver sdhci_pxav2_driver = {
+	.driver		= {
+		.name	= "sdhci-pxav2",
+#ifdef CONFIG_OF
+		.of_match_table = sdhci_pxav2_of_match,
+#endif
+		.pm	= SDHCI_PLTFM_PMOPS,
+	},
+	.probe		= sdhci_pxav2_probe,
+	.remove		= sdhci_pxav2_remove,
+};
+
+module_platform_driver(sdhci_pxav2_driver);
+
+MODULE_DESCRIPTION("SDHCI driver for pxav2");
+MODULE_AUTHOR("Marvell International Ltd.");
+MODULE_LICENSE("GPL v2");
+