Date:	Wed, 14 May 2014 22:59:35 +0800
From:	"Zhu, Lejun" <lejun.zhu@...ux.intel.com>
To:	sameo@...ux.intel.com, lee.jones@...aro.org
Cc:	linux-kernel@...r.kernel.org, bin.yang@...el.com,
	lejun.zhu@...ux.intel.com
Subject: [PATCH 1/4] mfd: intel_soc_pmic: Core driver

This patch provides the common code for the intel_soc_pmic MFD driver,
such as read/write register and set up IRQ.

Signed-off-by: Yang, Bin <bin.yang@...el.com>
Signed-off-by: Zhu, Lejun <lejun.zhu@...ux.intel.com>
---
 drivers/mfd/intel_soc_pmic_core.c  | 543 +++++++++++++++++++++++++++++++++++++
 drivers/mfd/intel_soc_pmic_core.h  |  83 ++++++
 include/linux/mfd/intel_soc_pmic.h |  29 ++
 3 files changed, 655 insertions(+)
 create mode 100644 drivers/mfd/intel_soc_pmic_core.c
 create mode 100644 drivers/mfd/intel_soc_pmic_core.h
 create mode 100644 include/linux/mfd/intel_soc_pmic.h

diff --git a/drivers/mfd/intel_soc_pmic_core.c b/drivers/mfd/intel_soc_pmic_core.c
new file mode 100644
index 0000000..bd4e248
--- /dev/null
+++ b/drivers/mfd/intel_soc_pmic_core.c
@@ -0,0 +1,543 @@
+/*
+ * intel_soc_pmic_core.c - Intel SoC PMIC Core Functions
+ *
+ * Copyright (C) 2013, 2014 Intel Corporation. All rights reserved.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License version
+ * 2 as published by the Free Software Foundation.
+ *
+ * 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.
+ *
+ * Author: Yang, Bin <bin.yang@...el.com>
+ */
+
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/delay.h>
+#include <linux/mutex.h>
+#include <linux/mfd/core.h>
+#include <linux/err.h>
+#include <linux/irq.h>
+#include <linux/interrupt.h>
+#include <linux/workqueue.h>
+#include <linux/acpi.h>
+#include <linux/version.h>
+#include <linux/gpio.h>
+#include <linux/mfd/intel_soc_pmic.h>
+#include "intel_soc_pmic_core.h"
+
+struct cell_dev_pdata {
+	struct list_head	list;
+	const char		*name;
+	void			*data;
+	int			len;
+};
+static LIST_HEAD(pdata_list);
+
+static struct intel_soc_pmic *pmic;
+static DEFINE_MUTEX(pmic_lock);	/* protecting pmic and its IO access */
+static int cache_offset = -1;
+static int cache_read_val;
+static int cache_write_val;
+static int cache_write_pending;
+static int cache_flags;
+
+struct device *intel_soc_pmic_dev(void)
+{
+	return pmic->dev;
+}
+
+/*
+ * Read from a PMIC register
+ */
+int intel_soc_pmic_readb(int reg)
+{
+	int ret;
+
+	mutex_lock(&pmic_lock);
+
+	if (!pmic)
+		ret = -EIO;
+	else
+		ret = pmic->readb(reg);
+
+	mutex_unlock(&pmic_lock);
+
+	return ret;
+}
+EXPORT_SYMBOL(intel_soc_pmic_readb);
+
+/*
+ * Write to a PMIC register
+ */
+int intel_soc_pmic_writeb(int reg, u8 val)
+{
+	int ret;
+
+	mutex_lock(&pmic_lock);
+
+	if (!pmic)
+		ret = -EIO;
+	else
+		ret = pmic->writeb(reg, val);
+
+	mutex_unlock(&pmic_lock);
+
+	return ret;
+}
+EXPORT_SYMBOL(intel_soc_pmic_writeb);
+
+/*
+ * Set 1 bit in a PMIC register
+ */
+int intel_soc_pmic_setb(int reg, u8 mask)
+{
+	int ret;
+	int val;
+
+	mutex_lock(&pmic_lock);
+
+	if (!pmic) {
+		ret = -EIO;
+	} else {
+		val = pmic->readb(reg);
+		val |= mask;
+		ret = pmic->writeb(reg, val);
+	}
+
+	mutex_unlock(&pmic_lock);
+
+	return ret;
+}
+EXPORT_SYMBOL(intel_soc_pmic_setb);
+
+/*
+ * Clear 1 bit in a PMIC register
+ */
+int intel_soc_pmic_clearb(int reg, u8 mask)
+{
+	int ret;
+	int val;
+
+	mutex_lock(&pmic_lock);
+
+	if (!pmic) {
+		ret = -EIO;
+	} else {
+		val = pmic->readb(reg);
+		val &= ~mask;
+		ret = pmic->writeb(reg, val);
+	}
+
+	mutex_unlock(&pmic_lock);
+
+	return ret;
+}
+EXPORT_SYMBOL(intel_soc_pmic_clearb);
+
+/*
+ * Set and clear multiple bits of a PMIC register
+ */
+int intel_soc_pmic_update(int reg, u8 val, u8 mask)
+{
+	int ret;
+
+	mutex_lock(&pmic_lock);
+
+	if (!pmic)
+		ret = -EIO;
+	else
+		ret = pmic->readb(reg);
+
+	if (ret < 0)
+		goto err;
+
+	val &= mask;
+	ret &= ~mask;
+	ret |= val;
+	ret = pmic->writeb(reg, ret);
+
+err:
+	mutex_unlock(&pmic_lock);
+
+	return ret;
+}
+EXPORT_SYMBOL(intel_soc_pmic_update);
+
+/*
+ * Set platform_data of the child devices. Needs to be called before
+ * the MFD device is added.
+ */
+int intel_soc_pmic_set_pdata(const char *name, void *data, int len)
+{
+	struct cell_dev_pdata *pdata;
+
+	pdata = kzalloc(sizeof(*pdata), GFP_KERNEL);
+	if (!pdata) {
+		pr_err("intel_pmic: can't set pdata!\n");
+		return -ENOMEM;
+	}
+
+	pdata->name = name;
+	pdata->data = data;
+	pdata->len = len;
+
+	list_add_tail(&pdata->list, &pdata_list);
+
+	return 0;
+}
+EXPORT_SYMBOL(intel_soc_pmic_set_pdata);
+
+static void __pmic_regmap_flush(void)
+{
+	if (cache_write_pending)
+		pmic->writeb(cache_offset, cache_write_val);
+	cache_offset = -1;
+	cache_write_pending = 0;
+}
+
+static void pmic_regmap_flush(void)
+{
+	mutex_lock(&pmic_lock);
+
+	if (pmic)
+		__pmic_regmap_flush();
+
+	mutex_unlock(&pmic_lock);
+}
+
+static int pmic_regmap_write(struct intel_pmic_regmap *map, int val)
+{
+	int ret = 0;
+
+	if (!IS_PMIC_REG_VALID(map))
+		return -ENXIO;
+
+	if (IS_PMIC_REG_INV(map))
+		val = ~val;
+
+	mutex_lock(&pmic_lock);
+
+	if (!pmic) {
+		ret = -ENODEV;
+		goto err;
+	}
+
+	if (cache_offset == map->offset) {
+		if (cache_flags != map->flags) {
+			dev_err(pmic->dev, "Same reg with diff flags\n");
+			__pmic_regmap_flush();
+		}
+	}
+
+	if (cache_offset != map->offset) {
+		__pmic_regmap_flush();
+		if (IS_PMIC_REG_WO(map) || IS_PMIC_REG_W1C(map)) {
+			cache_write_val = 0;
+			cache_read_val = pmic->readb(map->offset);
+		} else {
+			cache_read_val = pmic->readb(map->offset);
+			cache_write_val = cache_read_val;
+		}
+		if (cache_read_val < 0) {
+			dev_err(pmic->dev, "Register access error\n");
+			ret = -EIO;
+			goto err;
+		}
+		cache_offset = map->offset;
+		cache_flags = map->flags;
+	}
+
+	val = ((val & map->mask) << map->shift);
+	cache_write_val &= ~(map->mask << map->shift);
+	cache_write_val |= val;
+	cache_write_pending = 1;
+
+	if (!IS_PMIC_REG_WO(map) && !IS_PMIC_REG_W1C(map))
+		cache_read_val = cache_write_val;
+
+err:
+	dev_dbg(pmic->dev, "offset=%x, shift=%x, mask=%x, flags=%x\n",
+		map->offset, map->shift, map->mask, map->flags);
+	dev_dbg(pmic->dev, "cache_read=%x, cache_write=%x, ret=%x\n",
+		cache_read_val, cache_write_val, ret);
+
+	mutex_unlock(&pmic_lock);
+
+	return ret;
+}
+
+static int pmic_regmap_read(struct intel_pmic_regmap *map)
+{
+	int ret = 0;
+
+	if (!IS_PMIC_REG_VALID(map))
+		return -ENXIO;
+
+	mutex_lock(&pmic_lock);
+
+	if (!pmic) {
+		ret = -ENODEV;
+		goto err;
+	}
+
+	if (cache_offset == map->offset) {
+		if (cache_flags != map->flags) {
+			dev_err(pmic->dev, "Same reg with diff flags\n");
+			__pmic_regmap_flush();
+		}
+	}
+
+	if (cache_offset != map->offset) {
+		__pmic_regmap_flush();
+		if (IS_PMIC_REG_WO(map) || IS_PMIC_REG_W1C(map)) {
+			cache_write_val = 0;
+			cache_read_val = pmic->readb(map->offset);
+		} else {
+			cache_read_val = pmic->readb(map->offset);
+			cache_write_val = cache_read_val;
+		}
+		if (cache_read_val < 0) {
+			dev_err(pmic->dev, "Register access error\n");
+			ret = -EIO;
+			goto err;
+		}
+		cache_offset = map->offset;
+		cache_flags = map->flags;
+	}
+
+	if (IS_PMIC_REG_INV(map))
+		ret = ~cache_read_val;
+	else
+		ret = cache_read_val;
+
+	ret = (ret >> map->shift) & map->mask;
+	if (!IS_PMIC_REG_WO(map) && !IS_PMIC_REG_W1C(map))
+		cache_write_val = cache_read_val;
+
+err:
+	dev_dbg(pmic->dev, "offset=%x, shift=%x, mask=%x, flags=%x\n",
+		map->offset, map->shift, map->mask, map->flags);
+	dev_dbg(pmic->dev, "cache_read=%x, cache_write=%x, ret=%x\n",
+		cache_read_val, cache_write_val, ret);
+
+	mutex_unlock(&pmic_lock);
+
+	return ret;
+}
+
+static void pmic_irq_enable(struct irq_data *data)
+{
+	clear_bit(PMIC_IRQ_MASK_BIT(data->irq - pmic->irq_base),
+		  &PMIC_IRQ_MASK(pmic, data->irq - pmic->irq_base));
+	pmic->irq_need_update = 1;
+}
+
+static void pmic_irq_disable(struct irq_data *data)
+{
+	set_bit(PMIC_IRQ_MASK_BIT(data->irq - pmic->irq_base),
+		&PMIC_IRQ_MASK(pmic, data->irq - pmic->irq_base));
+	pmic->irq_need_update = 1;
+}
+
+static void pmic_irq_sync_unlock(struct irq_data *data)
+{
+	int val, irq_offset;
+	if (pmic->irq_need_update) {
+		irq_offset = data->irq - pmic->irq_base;
+		val = !!test_bit(PMIC_IRQ_MASK_BIT(irq_offset),
+				 &PMIC_IRQ_MASK(pmic, irq_offset));
+		pmic_regmap_write(&pmic->irq_regmap[irq_offset].mask, val);
+		pmic->irq_need_update = 0;
+		pmic_regmap_flush();
+	}
+	mutex_unlock(&pmic->irq_lock);
+}
+
+static void pmic_irq_lock(struct irq_data *data)
+{
+	mutex_lock(&pmic->irq_lock);
+}
+
+static irqreturn_t pmic_irq_isr(int irq, void *data)
+{
+	return IRQ_WAKE_THREAD;
+}
+
+static irqreturn_t pmic_irq_thread(int irq, void *data)
+{
+	int i;
+
+	mutex_lock(&pmic->irq_lock);
+
+	for (i = 0; i < pmic->irq_num; i++) {
+		if (test_bit(PMIC_IRQ_MASK_BIT(i), &PMIC_IRQ_MASK(pmic, i)))
+			continue;
+
+		if (pmic_regmap_read(&pmic->irq_regmap[i].status)) {
+			pmic_regmap_write(&pmic->irq_regmap[i].ack, 1);
+			handle_nested_irq(pmic->irq_base + i);
+		}
+	}
+
+	pmic_regmap_flush();
+
+	mutex_unlock(&pmic->irq_lock);
+
+	return IRQ_HANDLED;
+}
+
+static struct irq_chip pmic_irq_chip = {
+	.name			= "intel_soc_pmic",
+	.irq_bus_lock		= pmic_irq_lock,
+	.irq_bus_sync_unlock	= pmic_irq_sync_unlock,
+	.irq_disable		= pmic_irq_disable,
+	.irq_enable		= pmic_irq_enable,
+};
+
+static int pmic_irq_init(void)
+{
+	int cur_irq;
+	int ret;
+	int i;
+
+	for (i = 0; i < pmic->irq_num; i++) {
+		pmic_regmap_write(&pmic->irq_regmap[i].mask, 1);
+		set_bit(PMIC_IRQ_MASK_BIT(i), &PMIC_IRQ_MASK(pmic, i));
+	}
+
+	for (i = 0; i < pmic->irq_num; i++)
+		pmic_regmap_write(&pmic->irq_regmap[i].ack, 1);
+
+	pmic_regmap_flush();
+
+	pmic->irq_base = irq_alloc_descs(-1, 0, pmic->irq_num, 0);
+	if (pmic->irq_base < 0) {
+		dev_warn(pmic->dev, "Failed to allocate IRQs: %d\n",
+			 pmic->irq_base);
+		pmic->irq_base = 0;
+		ret = -EINVAL;
+		goto out;
+	} else {
+		dev_dbg(pmic->dev, "PMIC IRQ Base:%d\n", pmic->irq_base);
+	}
+
+	for (cur_irq = pmic->irq_base;
+	     cur_irq < pmic->irq_num + pmic->irq_base;
+	     cur_irq++) {
+		irq_set_chip_data(cur_irq, pmic);
+		irq_set_chip_and_handler(cur_irq, &pmic_irq_chip,
+					 handle_edge_irq);
+		irq_set_nested_thread(cur_irq, 1);
+		irq_set_noprobe(cur_irq);
+	}
+
+	if (gpio_is_valid(pmic->pmic_int_gpio)) {
+		ret = gpio_request_one(pmic->pmic_int_gpio,
+				       GPIOF_DIR_IN, "PMIC Interupt");
+		if (ret) {
+			dev_err(pmic->dev, "Request PMIC_INT gpio error\n");
+			goto out_free_desc;
+		}
+
+		pmic->irq = gpio_to_irq(pmic->pmic_int_gpio);
+	}
+
+	ret = request_threaded_irq(pmic->irq, pmic_irq_isr, pmic_irq_thread,
+				   pmic->irq_flags, "intel_soc_pmic", pmic);
+	if (ret != 0) {
+		dev_err(pmic->dev, "Failed to request IRQ %d: %d\n",
+			pmic->irq, ret);
+		goto out_free_gpio;
+	}
+
+	ret = enable_irq_wake(pmic->irq);
+	if (ret != 0)
+		dev_warn(pmic->dev, "Can't enable IRQ as wake source: %d\n",
+			 ret);
+
+	return 0;
+
+out_free_gpio:
+	if (gpio_is_valid(pmic->pmic_int_gpio)) {
+		gpio_free(pmic->pmic_int_gpio);
+		pmic->irq = 0;
+	}
+out_free_desc:
+	irq_free_descs(pmic->irq_base, pmic->irq_num);
+out:
+	return ret;
+}
+
+int intel_pmic_add(struct intel_soc_pmic *chip)
+{
+	int i, ret;
+	struct cell_dev_pdata *pdata;
+
+	mutex_lock(&pmic_lock);
+
+	if (pmic != NULL) {
+		mutex_unlock(&pmic_lock);
+		return -EBUSY;
+	}
+
+	pmic = chip;
+
+	mutex_unlock(&pmic_lock);
+
+	mutex_init(&chip->irq_lock);
+
+	if (chip->init) {
+		ret = chip->init();
+		if (ret != 0)
+			goto err;
+	}
+
+	ret = pmic_irq_init();
+	if (ret != 0)
+		goto err;
+
+	for (i = 0; chip->cell_dev[i].name != NULL; i++) {
+		list_for_each_entry(pdata, &pdata_list, list) {
+			if (!strcmp(pdata->name, chip->cell_dev[i].name)) {
+				chip->cell_dev[i].platform_data = pdata->data;
+				chip->cell_dev[i].pdata_size = pdata->len;
+			}
+		}
+	}
+
+	return mfd_add_devices(chip->dev, -1, chip->cell_dev, i,
+			       NULL, chip->irq_base, NULL);
+
+err:
+	mutex_lock(&pmic_lock);
+	if (pmic == chip)
+		pmic = NULL;
+	mutex_unlock(&pmic_lock);
+	return ret;
+}
+
+int intel_pmic_remove(struct intel_soc_pmic *chip)
+{
+	mutex_lock(&pmic_lock);
+
+	if (pmic != chip) {
+		mutex_unlock(&pmic_lock);
+		return -ENODEV;
+	}
+
+	pmic = NULL;
+
+	mutex_unlock(&pmic_lock);
+
+	mfd_remove_devices(chip->dev);
+
+	return 0;
+}
+
+MODULE_LICENSE("GPL");
+MODULE_AUTHOR("Yang, Bin <bin.yang@...el.com");
diff --git a/drivers/mfd/intel_soc_pmic_core.h b/drivers/mfd/intel_soc_pmic_core.h
new file mode 100644
index 0000000..a6cb051
--- /dev/null
+++ b/drivers/mfd/intel_soc_pmic_core.h
@@ -0,0 +1,83 @@
+/*
+ * intel_soc_pmic_core.h - Intel SoC PMIC MFD Driver
+ *
+ * Copyright (C) 2012-2014 Intel Corporation. All rights reserved.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License version
+ * 2 as published by the Free Software Foundation.
+ *
+ * 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.
+ *
+ * Author: Yang, Bin <bin.yang@...el.com>
+ */
+
+#ifndef __INTEL_SOC_PMIC_CORE_H__
+#define __INTEL_SOC_PMIC_CORE_H__
+
+#define INTEL_PMIC_IRQ_MAX	128
+#define INTEL_PMIC_REG_NULL	{-1,}
+
+#define INTEL_PMIC_REG_INV	BIT(0) /*value revert*/
+#define INTEL_PMIC_REG_WO	BIT(1) /*write only*/
+#define INTEL_PMIC_REG_RO	BIT(2) /*read only*/
+#define INTEL_PMIC_REG_W1C	BIT(3) /*write 1 clear*/
+#define INTEL_PMIC_REG_RC	BIT(4) /*read clear*/
+#define IS_PMIC_REG_INV(_map)	(_map->flags & INTEL_PMIC_REG_INV)
+#define IS_PMIC_REG_WO(_map)	(_map->flags & INTEL_PMIC_REG_WO)
+#define IS_PMIC_REG_RO(_map)	(_map->flags & INTEL_PMIC_REG_RO)
+#define IS_PMIC_REG_W1C(_map)	(_map->flags & INTEL_PMIC_REG_W1C)
+#define IS_PMIC_REG_RC(_map)	(_map->flags & INTEL_PMIC_REG_RC)
+#define IS_PMIC_REG_VALID(_map) \
+	((_map->mask != 0) && (_map->offset >= 0))
+
+#define PMIC_IRQREG_MASK	0
+#define PMIC_IRQREG_STATUS	1
+#define PMIC_IRQREG_ACK		2
+
+#define PMIC_IRQ_MASK_NBITS	32
+#define PMIC_IRQ_MASK_LEN	(INTEL_PMIC_IRQ_MAX / PMIC_IRQ_MASK_NBITS)
+#define PMIC_IRQ_MASK(pmic, offset)	\
+	(pmic->irq_mask[(offset) / PMIC_IRQ_MASK_NBITS])
+#define PMIC_IRQ_MASK_BIT(offset)	((offset) % PMIC_IRQ_MASK_NBITS)
+
+struct intel_pmic_regmap {
+	int				offset;
+	int				shift;
+	int				mask;
+	int				flags;
+};
+
+struct intel_pmic_irqregmap {
+	struct intel_pmic_regmap	mask;
+	struct intel_pmic_regmap	status;
+	struct intel_pmic_regmap	ack;
+};
+
+struct intel_soc_pmic {
+	const char			*label;
+	struct device			*dev;
+	struct mutex			irq_lock; /* irq_bus_lock */
+	int				irq_need_update;
+	int				irq;
+	unsigned long			irq_flags;
+	int				irq_num;
+	int				irq_base;
+	unsigned long			irq_mask[PMIC_IRQ_MASK_LEN];
+	int				pmic_int_gpio;
+	int				(*init)(void);
+	int				(*readb)(int);
+	int				(*writeb)(int, u8);
+	struct intel_pmic_irqregmap	*irq_regmap;
+	struct mfd_cell			*cell_dev;
+};
+
+int intel_pmic_add(struct intel_soc_pmic *chip);
+int intel_pmic_remove(struct intel_soc_pmic *chip);
+
+extern struct intel_soc_pmic crystal_cove_pmic;
+
+#endif	/* __INTEL_SOC_PMIC_CORE_H__ */
diff --git a/include/linux/mfd/intel_soc_pmic.h b/include/linux/mfd/intel_soc_pmic.h
new file mode 100644
index 0000000..88c28d9
--- /dev/null
+++ b/include/linux/mfd/intel_soc_pmic.h
@@ -0,0 +1,29 @@
+/*
+ * intel_soc_pmic.h - Intel SoC PMIC Driver
+ *
+ * Copyright (C) 2012-2014 Intel Corporation. All rights reserved.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License version
+ * 2 as published by the Free Software Foundation.
+ *
+ * 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.
+ *
+ * Author: Yang, Bin <bin.yang@...el.com>
+ */
+
+#ifndef __INTEL_SOC_PMIC_H__
+#define __INTEL_SOC_PMIC_H__
+
+int intel_soc_pmic_readb(int reg);
+int intel_soc_pmic_writeb(int reg, u8 val);
+int intel_soc_pmic_setb(int reg, u8 mask);
+int intel_soc_pmic_clearb(int reg, u8 mask);
+int intel_soc_pmic_update(int reg, u8 val, u8 mask);
+int intel_soc_pmic_set_pdata(const char *name, void *data, int len);
+struct device *intel_soc_pmic_dev(void);
+
+#endif	/* __INTEL_SOC_PMIC_H__ */
-- 
1.8.3.2

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