--- /dev/null
+/*
+ * MPC52xx gpio driver
+ *
+ * Copyright (c) 2008 Sascha Hauer <s.hauer@pengutronix.de>, Pengutronix
+ *
+ * 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., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
+ */
+
+#include <linux/of.h>
+#include <linux/kernel.h>
+#include <linux/slab.h>
+#include <linux/of_gpio.h>
+#include <linux/io.h>
+#include <linux/of_platform.h>
+#include <linux/module.h>
+
+#include <asm/gpio.h>
+#include <asm/mpc52xx.h>
+#include <sysdev/fsl_soc.h>
+
+static DEFINE_SPINLOCK(gpio_lock);
+
+struct mpc52xx_gpiochip {
+ struct of_mm_gpio_chip mmchip;
+ unsigned int shadow_dvo;
+ unsigned int shadow_gpioe;
+ unsigned int shadow_ddr;
+};
+
+/*
+ * GPIO LIB API implementation for wakeup GPIOs.
+ *
+ * There's a maximum of 8 wakeup GPIOs. Which of these are available
+ * for use depends on your board setup.
+ *
+ * 0 -> GPIO_WKUP_7
+ * 1 -> GPIO_WKUP_6
+ * 2 -> PSC6_1
+ * 3 -> PSC6_0
+ * 4 -> ETH_17
+ * 5 -> PSC3_9
+ * 6 -> PSC2_4
+ * 7 -> PSC1_4
+ *
+ */
+static int mpc52xx_wkup_gpio_get(struct gpio_chip *gc, unsigned int gpio)
+{
+ struct of_mm_gpio_chip *mm_gc = to_of_mm_gpio_chip(gc);
+ struct mpc52xx_gpio_wkup __iomem *regs = mm_gc->regs;
+ unsigned int ret;
+
+ ret = (in_8(®s->wkup_ival) >> (7 - gpio)) & 1;
+
+ pr_debug("%s: gpio: %d ret: %d\n", __func__, gpio, ret);
+
+ return ret;
+}
+
+static inline void
+__mpc52xx_wkup_gpio_set(struct gpio_chip *gc, unsigned int gpio, int val)
+{
+ struct of_mm_gpio_chip *mm_gc = to_of_mm_gpio_chip(gc);
+ struct mpc52xx_gpiochip *chip = container_of(mm_gc,
+ struct mpc52xx_gpiochip, mmchip);
+ struct mpc52xx_gpio_wkup __iomem *regs = mm_gc->regs;
+
+ if (val)
+ chip->shadow_dvo |= 1 << (7 - gpio);
+ else
+ chip->shadow_dvo &= ~(1 << (7 - gpio));
+
+ out_8(®s->wkup_dvo, chip->shadow_dvo);
+}
+
+static void
+mpc52xx_wkup_gpio_set(struct gpio_chip *gc, unsigned int gpio, int val)
+{
+ unsigned long flags;
+
+ spin_lock_irqsave(&gpio_lock, flags);
+
+ __mpc52xx_wkup_gpio_set(gc, gpio, val);
+
+ spin_unlock_irqrestore(&gpio_lock, flags);
+
+ pr_debug("%s: gpio: %d val: %d\n", __func__, gpio, val);
+}
+
+static int mpc52xx_wkup_gpio_dir_in(struct gpio_chip *gc, unsigned int gpio)
+{
+ struct of_mm_gpio_chip *mm_gc = to_of_mm_gpio_chip(gc);
+ struct mpc52xx_gpiochip *chip = container_of(mm_gc,
+ struct mpc52xx_gpiochip, mmchip);
+ struct mpc52xx_gpio_wkup __iomem *regs = mm_gc->regs;
+ unsigned long flags;
+
+ spin_lock_irqsave(&gpio_lock, flags);
+
+ /* set the direction */
+ chip->shadow_ddr &= ~(1 << (7 - gpio));
+ out_8(®s->wkup_ddr, chip->shadow_ddr);
+
+ /* and enable the pin */
+ chip->shadow_gpioe |= 1 << (7 - gpio);
+ out_8(®s->wkup_gpioe, chip->shadow_gpioe);
+
+ spin_unlock_irqrestore(&gpio_lock, flags);
+
+ return 0;
+}
+
+static int
+mpc52xx_wkup_gpio_dir_out(struct gpio_chip *gc, unsigned int gpio, int val)
+{
+ struct of_mm_gpio_chip *mm_gc = to_of_mm_gpio_chip(gc);
+ struct mpc52xx_gpio_wkup __iomem *regs = mm_gc->regs;
+ struct mpc52xx_gpiochip *chip = container_of(mm_gc,
+ struct mpc52xx_gpiochip, mmchip);
+ unsigned long flags;
+
+ spin_lock_irqsave(&gpio_lock, flags);
+
+ __mpc52xx_wkup_gpio_set(gc, gpio, val);
+
+ /* Then set direction */
+ chip->shadow_ddr |= 1 << (7 - gpio);
+ out_8(®s->wkup_ddr, chip->shadow_ddr);
+
+ /* Finally enable the pin */
+ chip->shadow_gpioe |= 1 << (7 - gpio);
+ out_8(®s->wkup_gpioe, chip->shadow_gpioe);
+
+ spin_unlock_irqrestore(&gpio_lock, flags);
+
+ pr_debug("%s: gpio: %d val: %d\n", __func__, gpio, val);
+
+ return 0;
+}
+
+static int mpc52xx_wkup_gpiochip_probe(struct platform_device *ofdev)
+{
+ struct mpc52xx_gpiochip *chip;
+ struct mpc52xx_gpio_wkup __iomem *regs;
+ struct gpio_chip *gc;
+ int ret;
+
+ chip = devm_kzalloc(&ofdev->dev, sizeof(*chip), GFP_KERNEL);
+ if (!chip)
+ return -ENOMEM;
+
+ platform_set_drvdata(ofdev, chip);
+
+ gc = &chip->mmchip.gc;
+
+ gc->ngpio = 8;
+ gc->direction_input = mpc52xx_wkup_gpio_dir_in;
+ gc->direction_output = mpc52xx_wkup_gpio_dir_out;
+ gc->get = mpc52xx_wkup_gpio_get;
+ gc->set = mpc52xx_wkup_gpio_set;
+
+ ret = of_mm_gpiochip_add(ofdev->dev.of_node, &chip->mmchip);
+ if (ret)
+ return ret;
+
+ regs = chip->mmchip.regs;
+ chip->shadow_gpioe = in_8(®s->wkup_gpioe);
+ chip->shadow_ddr = in_8(®s->wkup_ddr);
+ chip->shadow_dvo = in_8(®s->wkup_dvo);
+
+ return 0;
+}
+
+static int mpc52xx_gpiochip_remove(struct platform_device *ofdev)
+{
+ struct mpc52xx_gpiochip *chip = platform_get_drvdata(ofdev);
+
+ of_mm_gpiochip_remove(&chip->mmchip);
+
+ return 0;
+}
+
+static const struct of_device_id mpc52xx_wkup_gpiochip_match[] = {
+ { .compatible = "fsl,mpc5200-gpio-wkup", },
+ {}
+};
+
+static struct platform_driver mpc52xx_wkup_gpiochip_driver = {
+ .driver = {
+ .name = "mpc5200-gpio-wkup",
+ .of_match_table = mpc52xx_wkup_gpiochip_match,
+ },
+ .probe = mpc52xx_wkup_gpiochip_probe,
+ .remove = mpc52xx_gpiochip_remove,
+};
+
+/*
+ * GPIO LIB API implementation for simple GPIOs
+ *
+ * There's a maximum of 32 simple GPIOs. Which of these are available
+ * for use depends on your board setup.
+ * The numbering reflects the bit numbering in the port registers:
+ *
+ * 0..1 > reserved
+ * 2..3 > IRDA
+ * 4..7 > ETHR
+ * 8..11 > reserved
+ * 12..15 > USB
+ * 16..17 > reserved
+ * 18..23 > PSC3
+ * 24..27 > PSC2
+ * 28..31 > PSC1
+ */
+static int mpc52xx_simple_gpio_get(struct gpio_chip *gc, unsigned int gpio)
+{
+ struct of_mm_gpio_chip *mm_gc = to_of_mm_gpio_chip(gc);
+ struct mpc52xx_gpio __iomem *regs = mm_gc->regs;
+ unsigned int ret;
+
+ ret = (in_be32(®s->simple_ival) >> (31 - gpio)) & 1;
+
+ return ret;
+}
+
+static inline void
+__mpc52xx_simple_gpio_set(struct gpio_chip *gc, unsigned int gpio, int val)
+{
+ struct of_mm_gpio_chip *mm_gc = to_of_mm_gpio_chip(gc);
+ struct mpc52xx_gpiochip *chip = container_of(mm_gc,
+ struct mpc52xx_gpiochip, mmchip);
+ struct mpc52xx_gpio __iomem *regs = mm_gc->regs;
+
+ if (val)
+ chip->shadow_dvo |= 1 << (31 - gpio);
+ else
+ chip->shadow_dvo &= ~(1 << (31 - gpio));
+ out_be32(®s->simple_dvo, chip->shadow_dvo);
+}
+
+static void
+mpc52xx_simple_gpio_set(struct gpio_chip *gc, unsigned int gpio, int val)
+{
+ unsigned long flags;
+
+ spin_lock_irqsave(&gpio_lock, flags);
+
+ __mpc52xx_simple_gpio_set(gc, gpio, val);
+
+ spin_unlock_irqrestore(&gpio_lock, flags);
+
+ pr_debug("%s: gpio: %d val: %d\n", __func__, gpio, val);
+}
+
+static int mpc52xx_simple_gpio_dir_in(struct gpio_chip *gc, unsigned int gpio)
+{
+ struct of_mm_gpio_chip *mm_gc = to_of_mm_gpio_chip(gc);
+ struct mpc52xx_gpiochip *chip = container_of(mm_gc,
+ struct mpc52xx_gpiochip, mmchip);
+ struct mpc52xx_gpio __iomem *regs = mm_gc->regs;
+ unsigned long flags;
+
+ spin_lock_irqsave(&gpio_lock, flags);
+
+ /* set the direction */
+ chip->shadow_ddr &= ~(1 << (31 - gpio));
+ out_be32(®s->simple_ddr, chip->shadow_ddr);
+
+ /* and enable the pin */
+ chip->shadow_gpioe |= 1 << (31 - gpio);
+ out_be32(®s->simple_gpioe, chip->shadow_gpioe);
+
+ spin_unlock_irqrestore(&gpio_lock, flags);
+
+ return 0;
+}
+
+static int
+mpc52xx_simple_gpio_dir_out(struct gpio_chip *gc, unsigned int gpio, int val)
+{
+ struct of_mm_gpio_chip *mm_gc = to_of_mm_gpio_chip(gc);
+ struct mpc52xx_gpiochip *chip = container_of(mm_gc,
+ struct mpc52xx_gpiochip, mmchip);
+ struct mpc52xx_gpio __iomem *regs = mm_gc->regs;
+ unsigned long flags;
+
+ spin_lock_irqsave(&gpio_lock, flags);
+
+ /* First set initial value */
+ __mpc52xx_simple_gpio_set(gc, gpio, val);
+
+ /* Then set direction */
+ chip->shadow_ddr |= 1 << (31 - gpio);
+ out_be32(®s->simple_ddr, chip->shadow_ddr);
+
+ /* Finally enable the pin */
+ chip->shadow_gpioe |= 1 << (31 - gpio);
+ out_be32(®s->simple_gpioe, chip->shadow_gpioe);
+
+ spin_unlock_irqrestore(&gpio_lock, flags);
+
+ pr_debug("%s: gpio: %d val: %d\n", __func__, gpio, val);
+
+ return 0;
+}
+
+static int mpc52xx_simple_gpiochip_probe(struct platform_device *ofdev)
+{
+ struct mpc52xx_gpiochip *chip;
+ struct gpio_chip *gc;
+ struct mpc52xx_gpio __iomem *regs;
+ int ret;
+
+ chip = devm_kzalloc(&ofdev->dev, sizeof(*chip), GFP_KERNEL);
+ if (!chip)
+ return -ENOMEM;
+
+ platform_set_drvdata(ofdev, chip);
+
+ gc = &chip->mmchip.gc;
+
+ gc->ngpio = 32;
+ gc->direction_input = mpc52xx_simple_gpio_dir_in;
+ gc->direction_output = mpc52xx_simple_gpio_dir_out;
+ gc->get = mpc52xx_simple_gpio_get;
+ gc->set = mpc52xx_simple_gpio_set;
+
+ ret = of_mm_gpiochip_add(ofdev->dev.of_node, &chip->mmchip);
+ if (ret)
+ return ret;
+
+ regs = chip->mmchip.regs;
+ chip->shadow_gpioe = in_be32(®s->simple_gpioe);
+ chip->shadow_ddr = in_be32(®s->simple_ddr);
+ chip->shadow_dvo = in_be32(®s->simple_dvo);
+
+ return 0;
+}
+
+static const struct of_device_id mpc52xx_simple_gpiochip_match[] = {
+ { .compatible = "fsl,mpc5200-gpio", },
+ {}
+};
+
+static struct platform_driver mpc52xx_simple_gpiochip_driver = {
+ .driver = {
+ .name = "mpc5200-gpio",
+ .of_match_table = mpc52xx_simple_gpiochip_match,
+ },
+ .probe = mpc52xx_simple_gpiochip_probe,
+ .remove = mpc52xx_gpiochip_remove,
+};
+
+static int __init mpc52xx_gpio_init(void)
+{
+ if (platform_driver_register(&mpc52xx_wkup_gpiochip_driver))
+ printk(KERN_ERR "Unable to register wakeup GPIO driver\n");
+
+ if (platform_driver_register(&mpc52xx_simple_gpiochip_driver))
+ printk(KERN_ERR "Unable to register simple GPIO driver\n");
+
+ return 0;
+}
+
+/* Make sure we get initialised before anyone else tries to use us */
+subsys_initcall(mpc52xx_gpio_init);
+
+static void __exit mpc52xx_gpio_exit(void)
+{
+ platform_driver_unregister(&mpc52xx_wkup_gpiochip_driver);
+
+ platform_driver_unregister(&mpc52xx_simple_gpiochip_driver);
+}
+module_exit(mpc52xx_gpio_exit);
+
+MODULE_DESCRIPTION("Freescale MPC52xx gpio driver");
+MODULE_AUTHOR("Sascha Hauer <s.hauer@pengutronix.de");
+MODULE_LICENSE("GPL v2");
+
Code Review / kvmfornfv.git / blobdiff