Initial import

1 files changed, 628 insertions, 0 deletions

diff --git a/drivers/gpio/gpio-twl4030.c b/drivers/gpio/gpio-twl4030.c
new file mode 100644
index 000000000..9e1dbb987
--- /dev/null
+++ b/drivers/gpio/gpio-twl4030.c
@@ -0,0 +1,628 @@
+/*
+ * Access to GPIOs on TWL4030/TPS659x0 chips
+ *
+ * Copyright (C) 2006-2007 Texas Instruments, Inc.
+ * Copyright (C) 2006 MontaVista Software, Inc.
+ *
+ * Code re-arranged and cleaned up by:
+ *	Syed Mohammed Khasim <x0khasim@ti.com>
+ *
+ * Initial Code:
+ *	Andy Lowe / Nishanth Menon
+ *
+ * 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; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * 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., 59 Temple Place, Suite 330, Boston, MA  02111-1307 USA
+ */
+
+#include <linux/module.h>
+#include <linux/init.h>
+#include <linux/interrupt.h>
+#include <linux/kthread.h>
+#include <linux/irq.h>
+#include <linux/gpio.h>
+#include <linux/platform_device.h>
+#include <linux/of.h>
+#include <linux/irqdomain.h>
+
+#include <linux/i2c/twl.h>
+
+/*
+ * The GPIO "subchip" supports 18 GPIOs which can be configured as
+ * inputs or outputs, with pullups or pulldowns on each pin.  Each
+ * GPIO can trigger interrupts on either or both edges.
+ *
+ * GPIO interrupts can be fed to either of two IRQ lines; this is
+ * intended to support multiple hosts.
+ *
+ * There are also two LED pins used sometimes as output-only GPIOs.
+ */
+
+/* genirq interfaces are not available to modules */
+#ifdef MODULE
+#define is_module()	true
+#else
+#define is_module()	false
+#endif
+
+/* GPIO_CTRL Fields */
+#define MASK_GPIO_CTRL_GPIO0CD1		BIT(0)
+#define MASK_GPIO_CTRL_GPIO1CD2		BIT(1)
+#define MASK_GPIO_CTRL_GPIO_ON		BIT(2)
+
+/* Mask for GPIO registers when aggregated into a 32-bit integer */
+#define GPIO_32_MASK			0x0003ffff
+
+struct gpio_twl4030_priv {
+	struct gpio_chip gpio_chip;
+	struct mutex mutex;
+	int irq_base;
+
+	/* Bitfields for state caching */
+	unsigned int usage_count;
+	unsigned int direction;
+	unsigned int out_state;
+};
+
+/*----------------------------------------------------------------------*/
+
+static inline struct gpio_twl4030_priv *to_gpio_twl4030(struct gpio_chip *chip)
+{
+	return container_of(chip, struct gpio_twl4030_priv, gpio_chip);
+}
+
+/*
+ * To configure TWL4030 GPIO module registers
+ */
+static inline int gpio_twl4030_write(u8 address, u8 data)
+{
+	return twl_i2c_write_u8(TWL4030_MODULE_GPIO, data, address);
+}
+
+/*----------------------------------------------------------------------*/
+
+/*
+ * LED register offsets from TWL_MODULE_LED base
+ * PWMs A and B are dedicated to LEDs A and B, respectively.
+ */
+
+#define TWL4030_LED_LEDEN_REG	0x00
+#define TWL4030_PWMAON_REG	0x01
+#define TWL4030_PWMAOFF_REG	0x02
+#define TWL4030_PWMBON_REG	0x03
+#define TWL4030_PWMBOFF_REG	0x04
+
+/* LEDEN bits */
+#define LEDEN_LEDAON		BIT(0)
+#define LEDEN_LEDBON		BIT(1)
+#define LEDEN_LEDAEXT		BIT(2)
+#define LEDEN_LEDBEXT		BIT(3)
+#define LEDEN_LEDAPWM		BIT(4)
+#define LEDEN_LEDBPWM		BIT(5)
+#define LEDEN_PWM_LENGTHA	BIT(6)
+#define LEDEN_PWM_LENGTHB	BIT(7)
+
+#define PWMxON_LENGTH		BIT(7)
+
+/*----------------------------------------------------------------------*/
+
+/*
+ * To read a TWL4030 GPIO module register
+ */
+static inline int gpio_twl4030_read(u8 address)
+{
+	u8 data;
+	int ret = 0;
+
+	ret = twl_i2c_read_u8(TWL4030_MODULE_GPIO, &data, address);
+	return (ret < 0) ? ret : data;
+}
+
+/*----------------------------------------------------------------------*/
+
+static u8 cached_leden;
+
+/* The LED lines are open drain outputs ... a FET pulls to GND, so an
+ * external pullup is needed.  We could also expose the integrated PWM
+ * as a LED brightness control; we initialize it as "always on".
+ */
+static void twl4030_led_set_value(int led, int value)
+{
+	u8 mask = LEDEN_LEDAON | LEDEN_LEDAPWM;
+
+	if (led)
+		mask <<= 1;
+
+	if (value)
+		cached_leden &= ~mask;
+	else
+		cached_leden |= mask;
+
+	WARN_ON_ONCE(twl_i2c_write_u8(TWL4030_MODULE_LED, cached_leden,
+				      TWL4030_LED_LEDEN_REG));
+}
+
+static int twl4030_set_gpio_direction(int gpio, int is_input)
+{
+	u8 d_bnk = gpio >> 3;
+	u8 d_msk = BIT(gpio & 0x7);
+	u8 reg = 0;
+	u8 base = REG_GPIODATADIR1 + d_bnk;
+	int ret = 0;
+
+	ret = gpio_twl4030_read(base);
+	if (ret >= 0) {
+		if (is_input)
+			reg = ret & ~d_msk;
+		else
+			reg = ret | d_msk;
+
+		ret = gpio_twl4030_write(base, reg);
+	}
+	return ret;
+}
+
+static int twl4030_set_gpio_dataout(int gpio, int enable)
+{
+	u8 d_bnk = gpio >> 3;
+	u8 d_msk = BIT(gpio & 0x7);
+	u8 base = 0;
+
+	if (enable)
+		base = REG_SETGPIODATAOUT1 + d_bnk;
+	else
+		base = REG_CLEARGPIODATAOUT1 + d_bnk;
+
+	return gpio_twl4030_write(base, d_msk);
+}
+
+static int twl4030_get_gpio_datain(int gpio)
+{
+	u8 d_bnk = gpio >> 3;
+	u8 d_off = gpio & 0x7;
+	u8 base = 0;
+	int ret = 0;
+
+	base = REG_GPIODATAIN1 + d_bnk;
+	ret = gpio_twl4030_read(base);
+	if (ret > 0)
+		ret = (ret >> d_off) & 0x1;
+
+	return ret;
+}
+
+/*----------------------------------------------------------------------*/
+
+static int twl_request(struct gpio_chip *chip, unsigned offset)
+{
+	struct gpio_twl4030_priv *priv = to_gpio_twl4030(chip);
+	int status = 0;
+
+	mutex_lock(&priv->mutex);
+
+	/* Support the two LED outputs as output-only GPIOs. */
+	if (offset >= TWL4030_GPIO_MAX) {
+		u8	ledclr_mask = LEDEN_LEDAON | LEDEN_LEDAEXT
+				| LEDEN_LEDAPWM | LEDEN_PWM_LENGTHA;
+		u8	reg = TWL4030_PWMAON_REG;
+
+		offset -= TWL4030_GPIO_MAX;
+		if (offset) {
+			ledclr_mask <<= 1;
+			reg = TWL4030_PWMBON_REG;
+		}
+
+		/* initialize PWM to always-drive */
+		/* Configure PWM OFF register first */
+		status = twl_i2c_write_u8(TWL4030_MODULE_LED, 0x7f, reg + 1);
+		if (status < 0)
+			goto done;
+
+		/* Followed by PWM ON register */
+		status = twl_i2c_write_u8(TWL4030_MODULE_LED, 0x7f, reg);
+		if (status < 0)
+			goto done;
+
+		/* init LED to not-driven (high) */
+		status = twl_i2c_read_u8(TWL4030_MODULE_LED, &cached_leden,
+					 TWL4030_LED_LEDEN_REG);
+		if (status < 0)
+			goto done;
+		cached_leden &= ~ledclr_mask;
+		status = twl_i2c_write_u8(TWL4030_MODULE_LED, cached_leden,
+					  TWL4030_LED_LEDEN_REG);
+		if (status < 0)
+			goto done;
+
+		status = 0;
+		goto done;
+	}
+
+	/* on first use, turn GPIO module "on" */
+	if (!priv->usage_count) {
+		struct twl4030_gpio_platform_data *pdata;
+		u8 value = MASK_GPIO_CTRL_GPIO_ON;
+
+		/* optionally have the first two GPIOs switch vMMC1
+		 * and vMMC2 power supplies based on card presence.
+		 */
+		pdata = dev_get_platdata(chip->dev);
+		if (pdata)
+			value |= pdata->mmc_cd & 0x03;
+
+		status = gpio_twl4030_write(REG_GPIO_CTRL, value);
+	}
+
+done:
+	if (!status)
+		priv->usage_count |= BIT(offset);
+
+	mutex_unlock(&priv->mutex);
+	return status;
+}
+
+static void twl_free(struct gpio_chip *chip, unsigned offset)
+{
+	struct gpio_twl4030_priv *priv = to_gpio_twl4030(chip);
+
+	mutex_lock(&priv->mutex);
+	if (offset >= TWL4030_GPIO_MAX) {
+		twl4030_led_set_value(offset - TWL4030_GPIO_MAX, 1);
+		goto out;
+	}
+
+	priv->usage_count &= ~BIT(offset);
+
+	/* on last use, switch off GPIO module */
+	if (!priv->usage_count)
+		gpio_twl4030_write(REG_GPIO_CTRL, 0x0);
+
+out:
+	mutex_unlock(&priv->mutex);
+}
+
+static int twl_direction_in(struct gpio_chip *chip, unsigned offset)
+{
+	struct gpio_twl4030_priv *priv = to_gpio_twl4030(chip);
+	int ret;
+
+	mutex_lock(&priv->mutex);
+	if (offset < TWL4030_GPIO_MAX)
+		ret = twl4030_set_gpio_direction(offset, 1);
+	else
+		ret = -EINVAL;	/* LED outputs can't be set as input */
+
+	if (!ret)
+		priv->direction &= ~BIT(offset);
+
+	mutex_unlock(&priv->mutex);
+
+	return ret;
+}
+
+static int twl_get(struct gpio_chip *chip, unsigned offset)
+{
+	struct gpio_twl4030_priv *priv = to_gpio_twl4030(chip);
+	int ret;
+	int status = 0;
+
+	mutex_lock(&priv->mutex);
+	if (!(priv->usage_count & BIT(offset))) {
+		ret = -EPERM;
+		goto out;
+	}
+
+	if (priv->direction & BIT(offset))
+		status = priv->out_state & BIT(offset);
+	else
+		status = twl4030_get_gpio_datain(offset);
+
+	ret = (status <= 0) ? 0 : 1;
+out:
+	mutex_unlock(&priv->mutex);
+	return ret;
+}
+
+static void twl_set(struct gpio_chip *chip, unsigned offset, int value)
+{
+	struct gpio_twl4030_priv *priv = to_gpio_twl4030(chip);
+
+	mutex_lock(&priv->mutex);
+	if (offset < TWL4030_GPIO_MAX)
+		twl4030_set_gpio_dataout(offset, value);
+	else
+		twl4030_led_set_value(offset - TWL4030_GPIO_MAX, value);
+
+	if (value)
+		priv->out_state |= BIT(offset);
+	else
+		priv->out_state &= ~BIT(offset);
+
+	mutex_unlock(&priv->mutex);
+}
+
+static int twl_direction_out(struct gpio_chip *chip, unsigned offset, int value)
+{
+	struct gpio_twl4030_priv *priv = to_gpio_twl4030(chip);
+	int ret = 0;
+
+	mutex_lock(&priv->mutex);
+	if (offset < TWL4030_GPIO_MAX) {
+		ret = twl4030_set_gpio_direction(offset, 0);
+		if (ret) {
+			mutex_unlock(&priv->mutex);
+			return ret;
+		}
+	}
+
+	/*
+	 *  LED gpios i.e. offset >= TWL4030_GPIO_MAX are always output
+	 */
+
+	priv->direction |= BIT(offset);
+	mutex_unlock(&priv->mutex);
+
+	twl_set(chip, offset, value);
+
+	return ret;
+}
+
+static int twl_to_irq(struct gpio_chip *chip, unsigned offset)
+{
+	struct gpio_twl4030_priv *priv = to_gpio_twl4030(chip);
+
+	return (priv->irq_base && (offset < TWL4030_GPIO_MAX))
+		? (priv->irq_base + offset)
+		: -EINVAL;
+}
+
+static struct gpio_chip template_chip = {
+	.label			= "twl4030",
+	.owner			= THIS_MODULE,
+	.request		= twl_request,
+	.free			= twl_free,
+	.direction_input	= twl_direction_in,
+	.get			= twl_get,
+	.direction_output	= twl_direction_out,
+	.set			= twl_set,
+	.to_irq			= twl_to_irq,
+	.can_sleep		= true,
+};
+
+/*----------------------------------------------------------------------*/
+
+static int gpio_twl4030_pulls(u32 ups, u32 downs)
+{
+	u8		message[5];
+	unsigned	i, gpio_bit;
+
+	/* For most pins, a pulldown was enabled by default.
+	 * We should have data that's specific to this board.
+	 */
+	for (gpio_bit = 1, i = 0; i < 5; i++) {
+		u8		bit_mask;
+		unsigned	j;
+
+		for (bit_mask = 0, j = 0; j < 8; j += 2, gpio_bit <<= 1) {
+			if (ups & gpio_bit)
+				bit_mask |= 1 << (j + 1);
+			else if (downs & gpio_bit)
+				bit_mask |= 1 << (j + 0);
+		}
+		message[i] = bit_mask;
+	}
+
+	return twl_i2c_write(TWL4030_MODULE_GPIO, message,
+				REG_GPIOPUPDCTR1, 5);
+}
+
+static int gpio_twl4030_debounce(u32 debounce, u8 mmc_cd)
+{
+	u8		message[3];
+
+	/* 30 msec of debouncing is always used for MMC card detect,
+	 * and is optional for everything else.
+	 */
+	message[0] = (debounce & 0xff) | (mmc_cd & 0x03);
+	debounce >>= 8;
+	message[1] = (debounce & 0xff);
+	debounce >>= 8;
+	message[2] = (debounce & 0x03);
+
+	return twl_i2c_write(TWL4030_MODULE_GPIO, message,
+				REG_GPIO_DEBEN1, 3);
+}
+
+static int gpio_twl4030_remove(struct platform_device *pdev);
+
+static struct twl4030_gpio_platform_data *of_gpio_twl4030(struct device *dev,
+				struct twl4030_gpio_platform_data *pdata)
+{
+	struct twl4030_gpio_platform_data *omap_twl_info;
+
+	omap_twl_info = devm_kzalloc(dev, sizeof(*omap_twl_info), GFP_KERNEL);
+	if (!omap_twl_info)
+		return NULL;
+
+	if (pdata)
+		*omap_twl_info = *pdata;
+
+	omap_twl_info->use_leds = of_property_read_bool(dev->of_node,
+			"ti,use-leds");
+
+	of_property_read_u32(dev->of_node, "ti,debounce",
+			     &omap_twl_info->debounce);
+	of_property_read_u32(dev->of_node, "ti,mmc-cd",
+			     (u32 *)&omap_twl_info->mmc_cd);
+	of_property_read_u32(dev->of_node, "ti,pullups",
+			     &omap_twl_info->pullups);
+	of_property_read_u32(dev->of_node, "ti,pulldowns",
+			     &omap_twl_info->pulldowns);
+
+	return omap_twl_info;
+}
+
+static int gpio_twl4030_probe(struct platform_device *pdev)
+{
+	struct twl4030_gpio_platform_data *pdata = dev_get_platdata(&pdev->dev);
+	struct device_node *node = pdev->dev.of_node;
+	struct gpio_twl4030_priv *priv;
+	int ret, irq_base;
+
+	priv = devm_kzalloc(&pdev->dev, sizeof(struct gpio_twl4030_priv),
+			    GFP_KERNEL);
+	if (!priv)
+		return -ENOMEM;
+
+	/* maybe setup IRQs */
+	if (is_module()) {
+		dev_err(&pdev->dev, "can't dispatch IRQs from modules\n");
+		goto no_irqs;
+	}
+
+	irq_base = irq_alloc_descs(-1, 0, TWL4030_GPIO_MAX, 0);
+	if (irq_base < 0) {
+		dev_err(&pdev->dev, "Failed to alloc irq_descs\n");
+		return irq_base;
+	}
+
+	irq_domain_add_legacy(node, TWL4030_GPIO_MAX, irq_base, 0,
+			      &irq_domain_simple_ops, NULL);
+
+	ret = twl4030_sih_setup(&pdev->dev, TWL4030_MODULE_GPIO, irq_base);
+	if (ret < 0)
+		return ret;
+
+	priv->irq_base = irq_base;
+
+no_irqs:
+	priv->gpio_chip = template_chip;
+	priv->gpio_chip.base = -1;
+	priv->gpio_chip.ngpio = TWL4030_GPIO_MAX;
+	priv->gpio_chip.dev = &pdev->dev;
+
+	mutex_init(&priv->mutex);
+
+	if (node)
+		pdata = of_gpio_twl4030(&pdev->dev, pdata);
+
+	if (pdata == NULL) {
+		dev_err(&pdev->dev, "Platform data is missing\n");
+		return -ENXIO;
+	}
+
+	/*
+	 * NOTE:  boards may waste power if they don't set pullups
+	 * and pulldowns correctly ... default for non-ULPI pins is
+	 * pulldown, and some other pins may have external pullups
+	 * or pulldowns.  Careful!
+	 */
+	ret = gpio_twl4030_pulls(pdata->pullups, pdata->pulldowns);
+	if (ret)
+		dev_dbg(&pdev->dev, "pullups %.05x %.05x --> %d\n",
+			pdata->pullups, pdata->pulldowns, ret);
+
+	ret = gpio_twl4030_debounce(pdata->debounce, pdata->mmc_cd);
+	if (ret)
+		dev_dbg(&pdev->dev, "debounce %.03x %.01x --> %d\n",
+			pdata->debounce, pdata->mmc_cd, ret);
+
+	/*
+	 * NOTE: we assume VIBRA_CTL.VIBRA_EN, in MODULE_AUDIO_VOICE,
+	 * is (still) clear if use_leds is set.
+	 */
+	if (pdata->use_leds)
+		priv->gpio_chip.ngpio += 2;
+
+	ret = gpiochip_add(&priv->gpio_chip);
+	if (ret < 0) {
+		dev_err(&pdev->dev, "could not register gpiochip, %d\n", ret);
+		priv->gpio_chip.ngpio = 0;
+		gpio_twl4030_remove(pdev);
+		goto out;
+	}
+
+	platform_set_drvdata(pdev, priv);
+
+	if (pdata->setup) {
+		int status;
+
+		status = pdata->setup(&pdev->dev, priv->gpio_chip.base,
+				      TWL4030_GPIO_MAX);
+		if (status)
+			dev_dbg(&pdev->dev, "setup --> %d\n", status);
+	}
+
+out:
+	return ret;
+}
+
+/* Cannot use as gpio_twl4030_probe() calls us */
+static int gpio_twl4030_remove(struct platform_device *pdev)
+{
+	struct twl4030_gpio_platform_data *pdata = dev_get_platdata(&pdev->dev);
+	struct gpio_twl4030_priv *priv = platform_get_drvdata(pdev);
+	int status;
+
+	if (pdata && pdata->teardown) {
+		status = pdata->teardown(&pdev->dev, priv->gpio_chip.base,
+					 TWL4030_GPIO_MAX);
+		if (status) {
+			dev_dbg(&pdev->dev, "teardown --> %d\n", status);
+			return status;
+		}
+	}
+
+	gpiochip_remove(&priv->gpio_chip);
+
+	if (is_module())
+		return 0;
+
+	/* REVISIT no support yet for deregistering all the IRQs */
+	WARN_ON(1);
+	return -EIO;
+}
+
+static const struct of_device_id twl_gpio_match[] = {
+	{ .compatible = "ti,twl4030-gpio", },
+	{ },
+};
+MODULE_DEVICE_TABLE(of, twl_gpio_match);
+
+/* Note:  this hardware lives inside an I2C-based multi-function device. */
+MODULE_ALIAS("platform:twl4030_gpio");
+
+static struct platform_driver gpio_twl4030_driver = {
+	.driver = {
+		.name	= "twl4030_gpio",
+		.of_match_table = twl_gpio_match,
+	},
+	.probe		= gpio_twl4030_probe,
+	.remove		= gpio_twl4030_remove,
+};
+
+static int __init gpio_twl4030_init(void)
+{
+	return platform_driver_register(&gpio_twl4030_driver);
+}
+subsys_initcall(gpio_twl4030_init);
+
+static void __exit gpio_twl4030_exit(void)
+{
+	platform_driver_unregister(&gpio_twl4030_driver);
+}
+module_exit(gpio_twl4030_exit);
+
+MODULE_AUTHOR("Texas Instruments, Inc.");
+MODULE_DESCRIPTION("GPIO interface for TWL4030");
+MODULE_LICENSE("GPL");