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, 460 insertions, 0 deletions

diff --git a/kernel/drivers/regulator/ab8500-ext.c b/kernel/drivers/regulator/ab8500-ext.c
new file mode 100644
index 000000000..84c1ee39d
--- /dev/null
+++ b/kernel/drivers/regulator/ab8500-ext.c
@@ -0,0 +1,460 @@
+/*
+ * Copyright (C) ST-Ericsson SA 2010
+ *
+ * License Terms: GNU General Public License v2
+ *
+ * Authors: Bengt Jonsson <bengt.g.jonsson@stericsson.com>
+ *
+ * This file is based on drivers/regulator/ab8500.c
+ *
+ * AB8500 external regulators
+ *
+ * ab8500-ext supports the following regulators:
+ * - VextSupply3
+ */
+#include <linux/init.h>
+#include <linux/kernel.h>
+#include <linux/err.h>
+#include <linux/module.h>
+#include <linux/of.h>
+#include <linux/platform_device.h>
+#include <linux/regulator/driver.h>
+#include <linux/regulator/machine.h>
+#include <linux/regulator/of_regulator.h>
+#include <linux/mfd/abx500.h>
+#include <linux/mfd/abx500/ab8500.h>
+#include <linux/regulator/ab8500.h>
+
+/**
+ * struct ab8500_ext_regulator_info - ab8500 regulator information
+ * @dev: device pointer
+ * @desc: regulator description
+ * @rdev: regulator device
+ * @cfg: regulator configuration (extension of regulator FW configuration)
+ * @update_bank: bank to control on/off
+ * @update_reg: register to control on/off
+ * @update_mask: mask to enable/disable and set mode of regulator
+ * @update_val: bits holding the regulator current mode
+ * @update_val_hp: bits to set EN pin active (LPn pin deactive)
+ *                 normally this means high power mode
+ * @update_val_lp: bits to set EN pin active and LPn pin active
+ *                 normally this means low power mode
+ * @update_val_hw: bits to set regulator pins in HW control
+ *                 SysClkReq pins and logic will choose mode
+ */
+struct ab8500_ext_regulator_info {
+	struct device *dev;
+	struct regulator_desc desc;
+	struct regulator_dev *rdev;
+	struct ab8500_ext_regulator_cfg *cfg;
+	u8 update_bank;
+	u8 update_reg;
+	u8 update_mask;
+	u8 update_val;
+	u8 update_val_hp;
+	u8 update_val_lp;
+	u8 update_val_hw;
+};
+
+static int ab8500_ext_regulator_enable(struct regulator_dev *rdev)
+{
+	int ret;
+	struct ab8500_ext_regulator_info *info = rdev_get_drvdata(rdev);
+	u8 regval;
+
+	if (info == NULL) {
+		dev_err(rdev_get_dev(rdev), "regulator info null pointer\n");
+		return -EINVAL;
+	}
+
+	/*
+	 * To satisfy both HW high power request and SW request, the regulator
+	 * must be on in high power.
+	 */
+	if (info->cfg && info->cfg->hwreq)
+		regval = info->update_val_hp;
+	else
+		regval = info->update_val;
+
+	ret = abx500_mask_and_set_register_interruptible(info->dev,
+		info->update_bank, info->update_reg,
+		info->update_mask, regval);
+	if (ret < 0) {
+		dev_err(rdev_get_dev(info->rdev),
+			"couldn't set enable bits for regulator\n");
+		return ret;
+	}
+
+	dev_dbg(rdev_get_dev(rdev),
+		"%s-enable (bank, reg, mask, value): 0x%02x, 0x%02x, 0x%02x, 0x%02x\n",
+		info->desc.name, info->update_bank, info->update_reg,
+		info->update_mask, regval);
+
+	return 0;
+}
+
+static int ab8500_ext_regulator_disable(struct regulator_dev *rdev)
+{
+	int ret;
+	struct ab8500_ext_regulator_info *info = rdev_get_drvdata(rdev);
+	u8 regval;
+
+	if (info == NULL) {
+		dev_err(rdev_get_dev(rdev), "regulator info null pointer\n");
+		return -EINVAL;
+	}
+
+	/*
+	 * Set the regulator in HW request mode if configured
+	 */
+	if (info->cfg && info->cfg->hwreq)
+		regval = info->update_val_hw;
+	else
+		regval = 0;
+
+	ret = abx500_mask_and_set_register_interruptible(info->dev,
+		info->update_bank, info->update_reg,
+		info->update_mask, regval);
+	if (ret < 0) {
+		dev_err(rdev_get_dev(info->rdev),
+			"couldn't set disable bits for regulator\n");
+		return ret;
+	}
+
+	dev_dbg(rdev_get_dev(rdev), "%s-disable (bank, reg, mask, value):"
+		" 0x%02x, 0x%02x, 0x%02x, 0x%02x\n",
+		info->desc.name, info->update_bank, info->update_reg,
+		info->update_mask, regval);
+
+	return 0;
+}
+
+static int ab8500_ext_regulator_is_enabled(struct regulator_dev *rdev)
+{
+	int ret;
+	struct ab8500_ext_regulator_info *info = rdev_get_drvdata(rdev);
+	u8 regval;
+
+	if (info == NULL) {
+		dev_err(rdev_get_dev(rdev), "regulator info null pointer\n");
+		return -EINVAL;
+	}
+
+	ret = abx500_get_register_interruptible(info->dev,
+		info->update_bank, info->update_reg, &regval);
+	if (ret < 0) {
+		dev_err(rdev_get_dev(rdev),
+			"couldn't read 0x%x register\n", info->update_reg);
+		return ret;
+	}
+
+	dev_dbg(rdev_get_dev(rdev), "%s-is_enabled (bank, reg, mask, value):"
+		" 0x%02x, 0x%02x, 0x%02x, 0x%02x\n",
+		info->desc.name, info->update_bank, info->update_reg,
+		info->update_mask, regval);
+
+	if (((regval & info->update_mask) == info->update_val_lp) ||
+	    ((regval & info->update_mask) == info->update_val_hp))
+		return 1;
+	else
+		return 0;
+}
+
+static int ab8500_ext_regulator_set_mode(struct regulator_dev *rdev,
+					 unsigned int mode)
+{
+	int ret = 0;
+	struct ab8500_ext_regulator_info *info = rdev_get_drvdata(rdev);
+	u8 regval;
+
+	if (info == NULL) {
+		dev_err(rdev_get_dev(rdev), "regulator info null pointer\n");
+		return -EINVAL;
+	}
+
+	switch (mode) {
+	case REGULATOR_MODE_NORMAL:
+		regval = info->update_val_hp;
+		break;
+	case REGULATOR_MODE_IDLE:
+		regval = info->update_val_lp;
+		break;
+
+	default:
+		return -EINVAL;
+	}
+
+	/* If regulator is enabled and info->cfg->hwreq is set, the regulator
+	   must be on in high power, so we don't need to write the register with
+	   the same value.
+	 */
+	if (ab8500_ext_regulator_is_enabled(rdev) &&
+	    !(info->cfg && info->cfg->hwreq)) {
+		ret = abx500_mask_and_set_register_interruptible(info->dev,
+					info->update_bank, info->update_reg,
+					info->update_mask, regval);
+		if (ret < 0) {
+			dev_err(rdev_get_dev(rdev),
+				"Could not set regulator mode.\n");
+			return ret;
+		}
+
+		dev_dbg(rdev_get_dev(rdev),
+			"%s-set_mode (bank, reg, mask, value): "
+			"0x%x, 0x%x, 0x%x, 0x%x\n",
+			info->desc.name, info->update_bank, info->update_reg,
+			info->update_mask, regval);
+	}
+
+	info->update_val = regval;
+
+	return 0;
+}
+
+static unsigned int ab8500_ext_regulator_get_mode(struct regulator_dev *rdev)
+{
+	struct ab8500_ext_regulator_info *info = rdev_get_drvdata(rdev);
+	int ret;
+
+	if (info == NULL) {
+		dev_err(rdev_get_dev(rdev), "regulator info null pointer\n");
+		return -EINVAL;
+	}
+
+	if (info->update_val == info->update_val_hp)
+		ret = REGULATOR_MODE_NORMAL;
+	else if (info->update_val == info->update_val_lp)
+		ret = REGULATOR_MODE_IDLE;
+	else
+		ret = -EINVAL;
+
+	return ret;
+}
+
+static int ab8500_ext_set_voltage(struct regulator_dev *rdev, int min_uV,
+				  int max_uV, unsigned *selector)
+{
+	struct regulation_constraints *regu_constraints = rdev->constraints;
+
+	if (!regu_constraints) {
+		dev_err(rdev_get_dev(rdev), "No regulator constraints\n");
+		return -EINVAL;
+	}
+
+	if (regu_constraints->min_uV == min_uV &&
+	    regu_constraints->max_uV == max_uV)
+		return 0;
+
+	dev_err(rdev_get_dev(rdev),
+		"Requested min %duV max %duV != constrained min %duV max %duV\n",
+		min_uV, max_uV,
+		regu_constraints->min_uV, regu_constraints->max_uV);
+
+	return -EINVAL;
+}
+
+static int ab8500_ext_list_voltage(struct regulator_dev *rdev,
+				   unsigned selector)
+{
+	struct regulation_constraints *regu_constraints = rdev->constraints;
+
+	if (regu_constraints == NULL) {
+		dev_err(rdev_get_dev(rdev), "regulator constraints null pointer\n");
+		return -EINVAL;
+	}
+	/* return the uV for the fixed regulators */
+	if (regu_constraints->min_uV && regu_constraints->max_uV) {
+		if (regu_constraints->min_uV == regu_constraints->max_uV)
+			return regu_constraints->min_uV;
+	}
+	return -EINVAL;
+}
+
+static struct regulator_ops ab8500_ext_regulator_ops = {
+	.enable			= ab8500_ext_regulator_enable,
+	.disable		= ab8500_ext_regulator_disable,
+	.is_enabled		= ab8500_ext_regulator_is_enabled,
+	.set_mode		= ab8500_ext_regulator_set_mode,
+	.get_mode		= ab8500_ext_regulator_get_mode,
+	.set_voltage		= ab8500_ext_set_voltage,
+	.list_voltage		= ab8500_ext_list_voltage,
+};
+
+static struct ab8500_ext_regulator_info
+		ab8500_ext_regulator_info[AB8500_NUM_EXT_REGULATORS] = {
+	[AB8500_EXT_SUPPLY1] = {
+		.desc = {
+			.name		= "VEXTSUPPLY1",
+			.ops		= &ab8500_ext_regulator_ops,
+			.type		= REGULATOR_VOLTAGE,
+			.id		= AB8500_EXT_SUPPLY1,
+			.owner		= THIS_MODULE,
+			.n_voltages	= 1,
+		},
+		.update_bank		= 0x04,
+		.update_reg		= 0x08,
+		.update_mask		= 0x03,
+		.update_val		= 0x01,
+		.update_val_hp		= 0x01,
+		.update_val_lp		= 0x03,
+		.update_val_hw		= 0x02,
+	},
+	[AB8500_EXT_SUPPLY2] = {
+		.desc = {
+			.name		= "VEXTSUPPLY2",
+			.ops		= &ab8500_ext_regulator_ops,
+			.type		= REGULATOR_VOLTAGE,
+			.id		= AB8500_EXT_SUPPLY2,
+			.owner		= THIS_MODULE,
+			.n_voltages	= 1,
+		},
+		.update_bank		= 0x04,
+		.update_reg		= 0x08,
+		.update_mask		= 0x0c,
+		.update_val		= 0x04,
+		.update_val_hp		= 0x04,
+		.update_val_lp		= 0x0c,
+		.update_val_hw		= 0x08,
+	},
+	[AB8500_EXT_SUPPLY3] = {
+		.desc = {
+			.name		= "VEXTSUPPLY3",
+			.ops		= &ab8500_ext_regulator_ops,
+			.type		= REGULATOR_VOLTAGE,
+			.id		= AB8500_EXT_SUPPLY3,
+			.owner		= THIS_MODULE,
+			.n_voltages	= 1,
+		},
+		.update_bank		= 0x04,
+		.update_reg		= 0x08,
+		.update_mask		= 0x30,
+		.update_val		= 0x10,
+		.update_val_hp		= 0x10,
+		.update_val_lp		= 0x30,
+		.update_val_hw		= 0x20,
+	},
+};
+
+static struct of_regulator_match ab8500_ext_regulator_match[] = {
+	{ .name = "ab8500_ext1", .driver_data = (void *) AB8500_EXT_SUPPLY1, },
+	{ .name = "ab8500_ext2", .driver_data = (void *) AB8500_EXT_SUPPLY2, },
+	{ .name = "ab8500_ext3", .driver_data = (void *) AB8500_EXT_SUPPLY3, },
+};
+
+static int ab8500_ext_regulator_probe(struct platform_device *pdev)
+{
+	struct ab8500 *ab8500 = dev_get_drvdata(pdev->dev.parent);
+	struct ab8500_platform_data *ppdata;
+	struct ab8500_regulator_platform_data *pdata;
+	struct device_node *np = pdev->dev.of_node;
+	struct regulator_config config = { };
+	int i, err;
+
+	if (np) {
+		err = of_regulator_match(&pdev->dev, np,
+					 ab8500_ext_regulator_match,
+					 ARRAY_SIZE(ab8500_ext_regulator_match));
+		if (err < 0) {
+			dev_err(&pdev->dev,
+				"Error parsing regulator init data: %d\n", err);
+			return err;
+		}
+	}
+
+	if (!ab8500) {
+		dev_err(&pdev->dev, "null mfd parent\n");
+		return -EINVAL;
+	}
+
+	ppdata = dev_get_platdata(ab8500->dev);
+	if (!ppdata) {
+		dev_err(&pdev->dev, "null parent pdata\n");
+		return -EINVAL;
+	}
+
+	pdata = ppdata->regulator;
+	if (!pdata) {
+		dev_err(&pdev->dev, "null pdata\n");
+		return -EINVAL;
+	}
+
+	/* make sure the platform data has the correct size */
+	if (pdata->num_ext_regulator != ARRAY_SIZE(ab8500_ext_regulator_info)) {
+		dev_err(&pdev->dev, "Configuration error: size mismatch.\n");
+		return -EINVAL;
+	}
+
+	/* check for AB8500 2.x */
+	if (is_ab8500_2p0_or_earlier(ab8500)) {
+		struct ab8500_ext_regulator_info *info;
+
+		/* VextSupply3LPn is inverted on AB8500 2.x */
+		info = &ab8500_ext_regulator_info[AB8500_EXT_SUPPLY3];
+		info->update_val = 0x30;
+		info->update_val_hp = 0x30;
+		info->update_val_lp = 0x10;
+	}
+
+	/* register all regulators */
+	for (i = 0; i < ARRAY_SIZE(ab8500_ext_regulator_info); i++) {
+		struct ab8500_ext_regulator_info *info = NULL;
+
+		/* assign per-regulator data */
+		info = &ab8500_ext_regulator_info[i];
+		info->dev = &pdev->dev;
+		info->cfg = (struct ab8500_ext_regulator_cfg *)
+			pdata->ext_regulator[i].driver_data;
+
+		config.dev = &pdev->dev;
+		config.driver_data = info;
+		config.of_node = ab8500_ext_regulator_match[i].of_node;
+		config.init_data = (np) ?
+			ab8500_ext_regulator_match[i].init_data :
+			&pdata->ext_regulator[i];
+
+		/* register regulator with framework */
+		info->rdev = devm_regulator_register(&pdev->dev, &info->desc,
+						     &config);
+		if (IS_ERR(info->rdev)) {
+			err = PTR_ERR(info->rdev);
+			dev_err(&pdev->dev, "failed to register regulator %s\n",
+					info->desc.name);
+			return err;
+		}
+
+		dev_dbg(rdev_get_dev(info->rdev),
+			"%s-probed\n", info->desc.name);
+	}
+
+	return 0;
+}
+
+static struct platform_driver ab8500_ext_regulator_driver = {
+	.probe = ab8500_ext_regulator_probe,
+	.driver         = {
+		.name   = "ab8500-ext-regulator",
+	},
+};
+
+static int __init ab8500_ext_regulator_init(void)
+{
+	int ret;
+
+	ret = platform_driver_register(&ab8500_ext_regulator_driver);
+	if (ret)
+		pr_err("Failed to register ab8500 ext regulator: %d\n", ret);
+
+	return ret;
+}
+subsys_initcall(ab8500_ext_regulator_init);
+
+static void __exit ab8500_ext_regulator_exit(void)
+{
+	platform_driver_unregister(&ab8500_ext_regulator_driver);
+}
+module_exit(ab8500_ext_regulator_exit);
+
+MODULE_LICENSE("GPL v2");
+MODULE_AUTHOR("Bengt Jonsson <bengt.g.jonsson@stericsson.com>");
+MODULE_DESCRIPTION("AB8500 external regulator driver");
+MODULE_ALIAS("platform:ab8500-ext-regulator");