1 files changed, 340 insertions, 0 deletions

diff --git a/drivers/platform/x86/intel_pmic_gpio.c b/drivers/platform/x86/intel_pmic_gpio.c
new file mode 100644
index 00000000000..5cdcff65391
--- /dev/null
+++ b/drivers/platform/x86/intel_pmic_gpio.c
@@ -0,0 +1,340 @@
+/* Moorestown PMIC GPIO (access through IPC) driver
+ * Copyright (c) 2008 - 2009, Intel Corporation.
+ *
+ * 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.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+ */
+
+/* Supports:
+ * Moorestown platform PMIC chip
+ */
+
+#include <linux/module.h>
+#include <linux/kernel.h>
+#include <linux/interrupt.h>
+#include <linux/delay.h>
+#include <linux/stddef.h>
+#include <linux/slab.h>
+#include <linux/ioport.h>
+#include <linux/init.h>
+#include <linux/io.h>
+#include <linux/gpio.h>
+#include <linux/interrupt.h>
+#include <asm/intel_scu_ipc.h>
+#include <linux/device.h>
+#include <linux/intel_pmic_gpio.h>
+#include <linux/platform_device.h>
+
+#define DRIVER_NAME "pmic_gpio"
+
+/* register offset that IPC driver should use
+ * 8 GPIO + 8 GPOSW (6 controllable) + 8GPO
+ */
+enum pmic_gpio_register {
+	GPIO0		= 0xE0,
+	GPIO7		= 0xE7,
+	GPIOINT		= 0xE8,
+	GPOSWCTL0	= 0xEC,
+	GPOSWCTL5	= 0xF1,
+	GPO		= 0xF4,
+};
+
+/* bits definition for GPIO & GPOSW */
+#define GPIO_DRV 0x01
+#define GPIO_DIR 0x02
+#define GPIO_DIN 0x04
+#define GPIO_DOU 0x08
+#define GPIO_INTCTL 0x30
+#define GPIO_DBC 0xc0
+
+#define GPOSW_DRV 0x01
+#define GPOSW_DOU 0x08
+#define GPOSW_RDRV 0x30
+
+
+#define NUM_GPIO 24
+
+struct pmic_gpio_irq {
+	spinlock_t lock;
+	u32 trigger[NUM_GPIO];
+	u32 dirty;
+	struct work_struct work;
+};
+
+
+struct pmic_gpio {
+	struct gpio_chip	chip;
+	struct pmic_gpio_irq	irqtypes;
+	void			*gpiointr;
+	int			irq;
+	unsigned		irq_base;
+};
+
+static void pmic_program_irqtype(int gpio, int type)
+{
+	if (type & IRQ_TYPE_EDGE_RISING)
+		intel_scu_ipc_update_register(GPIO0 + gpio, 0x20, 0x20);
+	else
+		intel_scu_ipc_update_register(GPIO0 + gpio, 0x00, 0x20);
+
+	if (type & IRQ_TYPE_EDGE_FALLING)
+		intel_scu_ipc_update_register(GPIO0 + gpio, 0x10, 0x10);
+	else
+		intel_scu_ipc_update_register(GPIO0 + gpio, 0x00, 0x10);
+};
+
+static void pmic_irqtype_work(struct work_struct *work)
+{
+	struct pmic_gpio_irq *t =
+		container_of(work, struct pmic_gpio_irq, work);
+	unsigned long flags;
+	int i;
+	u16 type;
+
+	spin_lock_irqsave(&t->lock, flags);
+	/* As we drop the lock, we may need multiple scans if we race the
+	   pmic_irq_type function */
+	while (t->dirty) {
+		/*
+		 *	For each pin that has the dirty bit set send an IPC
+		 *	message to configure the hardware via the PMIC
+		 */
+		for (i = 0; i < NUM_GPIO; i++) {
+			if (!(t->dirty & (1 << i)))
+				continue;
+			t->dirty &= ~(1 << i);
+			/* We can't trust the array entry or dirty
+			   once the lock is dropped */
+			type = t->trigger[i];
+			spin_unlock_irqrestore(&t->lock, flags);
+			pmic_program_irqtype(i, type);
+			spin_lock_irqsave(&t->lock, flags);
+		}
+	}
+	spin_unlock_irqrestore(&t->lock, flags);
+}
+
+static int pmic_gpio_direction_input(struct gpio_chip *chip, unsigned offset)
+{
+	if (offset > 8) {
+		printk(KERN_ERR
+			"%s: only pin 0-7 support input\n", __func__);
+		return -1;/* we only have 8 GPIO can use as input */
+	}
+	return intel_scu_ipc_update_register(GPIO0 + offset,
+							GPIO_DIR, GPIO_DIR);
+}
+
+static int pmic_gpio_direction_output(struct gpio_chip *chip,
+			unsigned offset, int value)
+{
+	int rc = 0;
+
+	if (offset < 8)/* it is GPIO */
+		rc = intel_scu_ipc_update_register(GPIO0 + offset,
+				GPIO_DRV | GPIO_DOU | GPIO_DIR,
+				GPIO_DRV | (value ? GPIO_DOU : 0));
+	else if (offset < 16)/* it is GPOSW */
+		rc = intel_scu_ipc_update_register(GPOSWCTL0 + offset - 8,
+				GPOSW_DRV | GPOSW_DOU | GPOSW_RDRV,
+				GPOSW_DRV | (value ? GPOSW_DOU : 0));
+	else if (offset > 15 && offset < 24)/* it is GPO */
+		rc = intel_scu_ipc_update_register(GPO,
+				1 << (offset - 16),
+				value ? 1 << (offset - 16) : 0);
+	else {
+		printk(KERN_ERR
+			"%s: invalid PMIC GPIO pin %d!\n", __func__, offset);
+		WARN_ON(1);
+	}
+
+	return rc;
+}
+
+static int pmic_gpio_get(struct gpio_chip *chip, unsigned offset)
+{
+	u8 r;
+	int ret;
+
+	/* we only have 8 GPIO pins we can use as input */
+	if (offset > 8)
+		return -EOPNOTSUPP;
+	ret = intel_scu_ipc_ioread8(GPIO0 + offset, &r);
+	if (ret < 0)
+		return ret;
+	return r & GPIO_DIN;
+}
+
+static void pmic_gpio_set(struct gpio_chip *chip, unsigned offset, int value)
+{
+	if (offset < 8)/* it is GPIO */
+		intel_scu_ipc_update_register(GPIO0 + offset,
+			GPIO_DRV | GPIO_DOU,
+			GPIO_DRV | (value ? GPIO_DOU : 0));
+	else if (offset < 16)/* it is GPOSW */
+		intel_scu_ipc_update_register(GPOSWCTL0 + offset - 8,
+			GPOSW_DRV | GPOSW_DOU | GPOSW_RDRV,
+			GPOSW_DRV | (value ? GPOSW_DOU : 0));
+	else if (offset > 15 && offset < 24) /* it is GPO */
+		intel_scu_ipc_update_register(GPO,
+			1 << (offset - 16),
+			value ? 1 << (offset - 16) : 0);
+}
+
+static int pmic_irq_type(unsigned irq, unsigned type)
+{
+	struct pmic_gpio *pg = get_irq_chip_data(irq);
+	u32 gpio = irq - pg->irq_base;
+	unsigned long flags;
+
+	if (gpio > pg->chip.ngpio)
+		return -EINVAL;
+
+	spin_lock_irqsave(&pg->irqtypes.lock, flags);
+	pg->irqtypes.trigger[gpio] = type;
+	pg->irqtypes.dirty |=  (1 << gpio);
+	spin_unlock_irqrestore(&pg->irqtypes.lock, flags);
+	schedule_work(&pg->irqtypes.work);
+	return 0;
+}
+
+
+
+static int pmic_gpio_to_irq(struct gpio_chip *chip, unsigned offset)
+{
+	struct pmic_gpio *pg = container_of(chip, struct pmic_gpio, chip);
+
+	return pg->irq_base + offset;
+}
+
+/* the gpiointr register is read-clear, so just do nothing. */
+static void pmic_irq_unmask(unsigned irq)
+{
+};
+
+static void pmic_irq_mask(unsigned irq)
+{
+};
+
+static struct irq_chip pmic_irqchip = {
+	.name		= "PMIC-GPIO",
+	.mask		= pmic_irq_mask,
+	.unmask		= pmic_irq_unmask,
+	.set_type	= pmic_irq_type,
+};
+
+static void pmic_irq_handler(unsigned irq, struct irq_desc *desc)
+{
+	struct pmic_gpio *pg = (struct pmic_gpio *)get_irq_data(irq);
+	u8 intsts = *((u8 *)pg->gpiointr + 4);
+	int gpio;
+
+	for (gpio = 0; gpio < 8; gpio++) {
+		if (intsts & (1 << gpio)) {
+			pr_debug("pmic pin %d triggered\n", gpio);
+			generic_handle_irq(pg->irq_base + gpio);
+		}
+	}
+	desc->chip->eoi(irq);
+}
+
+static int __devinit platform_pmic_gpio_probe(struct platform_device *pdev)
+{
+	struct device *dev = &pdev->dev;
+	int irq = platform_get_irq(pdev, 0);
+	struct intel_pmic_gpio_platform_data *pdata = dev->platform_data;
+
+	struct pmic_gpio *pg;
+	int retval;
+	int i;
+
+	if (irq < 0) {
+		dev_dbg(dev, "no IRQ line\n");
+		return -EINVAL;
+	}
+
+	if (!pdata || !pdata->gpio_base || !pdata->irq_base) {
+		dev_dbg(dev, "incorrect or missing platform data\n");
+		return -EINVAL;
+	}
+
+	pg = kzalloc(sizeof(*pg), GFP_KERNEL);
+	if (!pg)
+		return -ENOMEM;
+
+	dev_set_drvdata(dev, pg);
+
+	pg->irq = irq;
+	/* setting up SRAM mapping for GPIOINT register */
+	pg->gpiointr = ioremap_nocache(pdata->gpiointr, 8);
+	if (!pg->gpiointr) {
+		printk(KERN_ERR "%s: Can not map GPIOINT.\n", __func__);
+		retval = -EINVAL;
+		goto err2;
+	}
+	pg->irq_base = pdata->irq_base;
+	pg->chip.label = "intel_pmic";
+	pg->chip.direction_input = pmic_gpio_direction_input;
+	pg->chip.direction_output = pmic_gpio_direction_output;
+	pg->chip.get = pmic_gpio_get;
+	pg->chip.set = pmic_gpio_set;
+	pg->chip.to_irq = pmic_gpio_to_irq;
+	pg->chip.base = pdata->gpio_base;
+	pg->chip.ngpio = NUM_GPIO;
+	pg->chip.can_sleep = 1;
+	pg->chip.dev = dev;
+
+	INIT_WORK(&pg->irqtypes.work, pmic_irqtype_work);
+	spin_lock_init(&pg->irqtypes.lock);
+
+	pg->chip.dev = dev;
+	retval = gpiochip_add(&pg->chip);
+	if (retval) {
+		printk(KERN_ERR "%s: Can not add pmic gpio chip.\n", __func__);
+		goto err;
+	}
+	set_irq_data(pg->irq, pg);
+	set_irq_chained_handler(pg->irq, pmic_irq_handler);
+	for (i = 0; i < 8; i++) {
+		set_irq_chip_and_handler_name(i + pg->irq_base, &pmic_irqchip,
+					handle_simple_irq, "demux");
+		set_irq_chip_data(i + pg->irq_base, pg);
+	}
+	return 0;
+err:
+	iounmap(pg->gpiointr);
+err2:
+	kfree(pg);
+	return retval;
+}
+
+/* at the same time, register a platform driver
+ * this supports the sfi 0.81 fw */
+static struct platform_driver platform_pmic_gpio_driver = {
+	.driver = {
+		.name		= DRIVER_NAME,
+		.owner		= THIS_MODULE,
+	},
+	.probe		= platform_pmic_gpio_probe,
+};
+
+static int __init platform_pmic_gpio_init(void)
+{
+	return platform_driver_register(&platform_pmic_gpio_driver);
+}
+
+subsys_initcall(platform_pmic_gpio_init);
+
+MODULE_AUTHOR("Alek Du <alek.du@intel.com>");
+MODULE_DESCRIPTION("Intel Moorestown PMIC GPIO driver");
+MODULE_LICENSE("GPL v2");