@@ -13,6 +13,30 @@
#ifndef __ASM_POWERPC_PPC4xx_H__
#define __ASM_POWERPC_PPC4xx_H__
+#include <linux/types.h>
+
+/* GPIO */
+struct ppc4xx_gpio {
+ __be32 gpio_or;
+ __be32 gpio_tcr;
+ __be32 gpio_osrl;
+ __be32 gpio_osrh;
+ __be32 gpio_tsrl;
+ __be32 gpio_tsrh;
+ __be32 gpio_odr;
+ __be32 gpio_ir;
+ __be32 gpio_rr1;
+ __be32 gpio_rr2;
+ __be32 gpio_rr3;
+ __be32 reserved1;
+ __be32 gpio_isr1l;
+ __be32 gpio_isr1h;
+ __be32 gpio_isr2l;
+ __be32 gpio_isr2h;
+ __be32 gpio_isr3l;
+ __be32 gpio_isr3h;
+};
+
extern void ppc4xx_reset_system(char *cmd);
#endif /* __ASM_POWERPC_PPC4xx_H__ */
@@ -6,3 +6,11 @@ config PPC4xx_PCI_EXPRESS
bool
depends on PCI && 4xx
default n
+
+config PPC4xx_GPIO
+ bool "PPC4xx GPIO support"
+ depends on 4xx
+ select ARCH_REQUIRE_GPIOLIB
+ select GENERIC_GPIO
+ help
+ Enable gpiolib support for PPC4xx based boards
@@ -35,6 +35,7 @@ obj-$(CONFIG_OF_RTC) += of_rtc.o
ifeq ($(CONFIG_PCI),y)
obj-$(CONFIG_4xx) += ppc4xx_pci.o
endif
+obj-$(CONFIG_PPC4xx_GPIO) += ppc4xx_gpio.o
# Temporary hack until we have migrated to asm-powerpc
ifeq ($(ARCH),powerpc)
new file mode 100644
@@ -0,0 +1,238 @@
+/*
+ * PPC4xx gpio driver
+ *
+ * Copyright (c) 2008 Harris Corporation
+ * Copyright (c) 2008 Sascha Hauer <s.hauer@pengutronix.de>, Pengutronix
+ * Copyright (c) MontaVista Software, Inc. 2008.
+ *
+ * Author: Steve Falco <sfalco@harris.com>
+ *
+ * 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/kernel.h>
+#include <linux/init.h>
+#include <linux/spinlock.h>
+#include <linux/io.h>
+#include <linux/of.h>
+#include <linux/of_gpio.h>
+#include <linux/gpio.h>
+
+#include <asm/ppc4xx.h>
+
+struct ppc4xx_gpio_chip {
+ struct of_mm_gpio_chip mm_gc;
+ spinlock_t lock;
+ u32 shadow_or;
+ u32 shadow_tcr;
+ u32 shadow_osrl;
+ u32 shadow_osrh;
+ u32 shadow_tsrl;
+ u32 shadow_tsrh;
+ u32 shadow_odr;
+};
+
+/*
+ * GPIO LIB API implementation for GPIOs
+ *
+ * There are a maximum of 64 gpios, spread over two sets of control registers.
+ * The sets are called GPIO0 and GPIO1. Each set is managed separately, so
+ * there will be two entried in the .dts file.
+ */
+
+static inline struct ppc4xx_gpio_chip *
+to_ppc4xx_gpiochip(struct of_mm_gpio_chip *mm_gc)
+{
+ return container_of(mm_gc, struct ppc4xx_gpio_chip, mm_gc);
+}
+
+static int ppc4xx_gpio_get(struct gpio_chip *gc, unsigned int gpio)
+{
+ struct of_mm_gpio_chip *mm_gc = to_of_mm_gpio_chip(gc);
+ struct ppc4xx_gpio __iomem *regs = mm_gc->regs;
+ u32 ret;
+
+ ret = (in_be32(®s->gpio_ir) >> (31 - gpio)) & 1;
+
+ return ret;
+}
+
+static inline void
+__ppc4xx_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 ppc4xx_gpio_chip *chip = to_ppc4xx_gpiochip(mm_gc);
+ struct ppc4xx_gpio __iomem *regs = mm_gc->regs;
+
+ if (val)
+ chip->shadow_or |= 1 << (31 - gpio);
+ else
+ chip->shadow_or &= ~(1 << (31 - gpio));
+ out_be32(®s->gpio_or, chip->shadow_or);
+}
+
+static void
+ppc4xx_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 ppc4xx_gpio_chip *chip = to_ppc4xx_gpiochip(mm_gc);
+ unsigned long flags;
+
+ spin_lock_irqsave(&chip->lock, flags);
+
+ __ppc4xx_gpio_set(gc, gpio, val);
+
+ spin_unlock_irqrestore(&chip->lock, flags);
+
+ pr_debug("%s: gpio: %d val: %d\n", __func__, gpio, val);
+}
+
+static int ppc4xx_gpio_dir_in(struct gpio_chip *gc, unsigned int gpio)
+{
+ struct of_mm_gpio_chip *mm_gc = to_of_mm_gpio_chip(gc);
+ struct ppc4xx_gpio_chip *chip = to_ppc4xx_gpiochip(mm_gc);
+ struct ppc4xx_gpio __iomem *regs = mm_gc->regs;
+ unsigned long flags;
+
+ spin_lock_irqsave(&chip->lock, flags);
+
+ /* Disable open-drain function */
+ chip->shadow_odr &= ~(1 << (31 - gpio));
+ out_be32(®s->gpio_odr, chip->shadow_odr);
+
+ /* Float the pin */
+ chip->shadow_tcr &= ~(1 << (31 - gpio));
+ out_be32(®s->gpio_tcr, chip->shadow_tcr);
+
+ /* Bits 0-15 use TSRL/OSRL, bits 16-31 use TSRH/OSRH */
+ if (gpio < 16) {
+ chip->shadow_osrl &= ~(3 << ((15 - gpio) * 2));
+ out_be32(®s->gpio_osrl, chip->shadow_osrl);
+
+ chip->shadow_tsrl &= ~(3 << ((15 - gpio) * 2));
+ out_be32(®s->gpio_tsrl, chip->shadow_tsrl);
+ } else {
+ chip->shadow_osrh &= ~(3 << ((31 - gpio) * 2));
+ out_be32(®s->gpio_osrh, chip->shadow_osrh);
+
+ chip->shadow_tsrh &= ~(3 << ((31 - gpio) * 2));
+ out_be32(®s->gpio_tsrh, chip->shadow_tsrh);
+ }
+
+ spin_unlock_irqrestore(&chip->lock, flags);
+
+ return 0;
+}
+
+static int
+ppc4xx_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 ppc4xx_gpio_chip *chip = to_ppc4xx_gpiochip(mm_gc);
+ struct ppc4xx_gpio __iomem *regs = mm_gc->regs;
+ unsigned long flags;
+
+ spin_lock_irqsave(&chip->lock, flags);
+
+ /* First set initial value */
+ __ppc4xx_gpio_set(gc, gpio, val);
+
+ /* Disable open-drain function */
+ chip->shadow_odr &= ~(1 << (31 - gpio));
+ out_be32(®s->gpio_odr, chip->shadow_odr);
+
+ /* Drive the pin */
+ chip->shadow_tcr |= (1 << (31 - gpio));
+ out_be32(®s->gpio_tcr, chip->shadow_tcr);
+
+ /* Bits 0-15 use TSRL, bits 16-31 use TSRH */
+ if (gpio < 16) {
+ chip->shadow_osrl &= ~(3 << ((15 - gpio) * 2));
+ out_be32(®s->gpio_osrl, chip->shadow_osrl);
+
+ chip->shadow_tsrl &= ~(3 << ((15 - gpio) * 2));
+ out_be32(®s->gpio_tsrl, chip->shadow_tsrl);
+ } else {
+ chip->shadow_osrh &= ~(3 << ((31 - gpio) * 2));
+ out_be32(®s->gpio_osrh, chip->shadow_osrh);
+
+ chip->shadow_tsrh &= ~(3 << ((31 - gpio) * 2));
+ out_be32(®s->gpio_tsrh, chip->shadow_tsrh);
+ }
+
+ spin_unlock_irqrestore(&chip->lock, flags);
+
+ pr_debug("%s: gpio: %d val: %d\n", __func__, gpio, val);
+
+ return 0;
+}
+
+static void __init ppc4xx_gpio_save_regs(struct of_mm_gpio_chip *mm_gc)
+{
+ struct ppc4xx_gpio_chip *chip = to_ppc4xx_gpiochip(mm_gc);
+ struct ppc4xx_gpio __iomem *regs = mm_gc->regs;
+
+ chip->shadow_or = in_be32(®s->gpio_or);
+ chip->shadow_tcr = in_be32(®s->gpio_tcr);
+ chip->shadow_osrl = in_be32(®s->gpio_osrl);
+ chip->shadow_osrh = in_be32(®s->gpio_osrh);
+ chip->shadow_tsrl = in_be32(®s->gpio_tsrl);
+ chip->shadow_tsrh = in_be32(®s->gpio_tsrh);
+ chip->shadow_odr = in_be32(®s->gpio_odr);
+}
+
+static int __init ppc4xx_add_gpiochips(void)
+{
+ struct device_node *np;
+
+ for_each_compatible_node(np, NULL, "amcc,ppc4xx-gpio") {
+ int ret;
+ struct ppc4xx_gpio_chip *ppc4xx_gc;
+ struct of_mm_gpio_chip *mm_gc;
+ struct of_gpio_chip *of_gc;
+ struct gpio_chip *gc;
+
+ ppc4xx_gc = kzalloc(sizeof(*ppc4xx_gc), GFP_KERNEL);
+ if (!ppc4xx_gc) {
+ ret = -ENOMEM;
+ goto err;
+ }
+
+ spin_lock_init(&ppc4xx_gc->lock);
+
+ mm_gc = &ppc4xx_gc->mm_gc;
+ of_gc = &mm_gc->of_gc;
+ gc = &of_gc->gc;
+
+ mm_gc->save_regs = ppc4xx_gpio_save_regs;
+ of_gc->gpio_cells = 2;
+ gc->ngpio = 32;
+ gc->direction_input = ppc4xx_gpio_dir_in;
+ gc->direction_output = ppc4xx_gpio_dir_out;
+ gc->get = ppc4xx_gpio_get;
+ gc->set = ppc4xx_gpio_set;
+
+ ret = of_mm_gpiochip_add(np, mm_gc);
+ if (ret)
+ goto err;
+ continue;
+err:
+ pr_err("%s: registration failed with status %d\n",
+ np->full_name, ret);
+ kfree(ppc4xx_gc);
+ /* try others anyway */
+ }
+ return 0;
+}
+arch_initcall(ppc4xx_add_gpiochips);
Please disregard the previous version, and consider this one instead. The only difference is making better use of to_ppc4xx_gpiochip(), which helps readability. Signed-off-by: Steve Falco <sfalco at harris.com>