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+/*
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+ * (C) Copyright 2016
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+ * Mario Six, Guntermann & Drunck GmbH, six@gdsys.de
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+ *
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+ * based on arch/powerpc/include/asm/mpc85xx_gpio.h, which is
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+ *
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+ * Copyright 2010 eXMeritus, A Boeing Company
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+ *
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+ * SPDX-License-Identifier: GPL-2.0+
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+ */
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+
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+#include <common.h>
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+#include <dm.h>
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+#include <asm/gpio.h>
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+#include <mapmem.h>
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+
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+DECLARE_GLOBAL_DATA_PTR;
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+
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+struct ccsr_gpio {
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+ u32 gpdir;
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+ u32 gpodr;
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+ u32 gpdat;
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+ u32 gpier;
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+ u32 gpimr;
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+ u32 gpicr;
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+};
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+
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+struct mpc85xx_gpio_data {
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+ /* The bank's register base in memory */
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+ struct ccsr_gpio __iomem *base;
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+ /* The address of the registers; used to identify the bank */
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+ ulong addr;
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+ /* The GPIO count of the bank */
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+ uint gpio_count;
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+ /* The GPDAT register cannot be used to determine the value of output
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+ * pins on MPC8572/MPC8536, so we shadow it and use the shadowed value
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+ * for output pins */
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+ u32 dat_shadow;
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+};
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+
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+inline u32 gpio_mask(unsigned gpio) {
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+ return (1U << (31 - (gpio)));
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+}
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+
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+static inline u32 mpc85xx_gpio_get_val(struct ccsr_gpio *base, u32 mask)
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+{
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+ return in_be32(&base->gpdat) & mask;
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+}
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+
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+static inline u32 mpc85xx_gpio_get_dir(struct ccsr_gpio *base, u32 mask)
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+{
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+ return in_be32(&base->gpdir) & mask;
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+}
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+
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+static inline void mpc85xx_gpio_set_in(struct ccsr_gpio *base, u32 gpios)
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+{
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+ clrbits_be32(&base->gpdat, gpios);
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+ /* GPDIR register 0 -> input */
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+ clrbits_be32(&base->gpdir, gpios);
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+}
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+
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+static inline void mpc85xx_gpio_set_low(struct ccsr_gpio *base, u32 gpios)
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+{
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+ clrbits_be32(&base->gpdat, gpios);
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+ /* GPDIR register 1 -> output */
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+ setbits_be32(&base->gpdir, gpios);
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+}
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+
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+static inline void mpc85xx_gpio_set_high(struct ccsr_gpio *base, u32 gpios)
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+{
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+ setbits_be32(&base->gpdat, gpios);
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+ /* GPDIR register 1 -> output */
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+ setbits_be32(&base->gpdir, gpios);
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+}
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+
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+static inline int mpc85xx_gpio_open_drain_val(struct ccsr_gpio *base, u32 mask)
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+{
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+ return in_be32(&base->gpodr) & mask;
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+}
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+
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+static inline void mpc85xx_gpio_open_drain_on(struct ccsr_gpio *base, u32
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+ gpios)
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+{
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+ /* GPODR register 1 -> open drain on */
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+ setbits_be32(&base->gpodr, gpios);
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+}
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+
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+static inline void mpc85xx_gpio_open_drain_off(struct ccsr_gpio *base,
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+ u32 gpios)
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+{
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+ /* GPODR register 0 -> open drain off (actively driven) */
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+ clrbits_be32(&base->gpodr, gpios);
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+}
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+
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+static int mpc85xx_gpio_direction_input(struct udevice *dev, unsigned gpio)
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+{
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+ struct mpc85xx_gpio_data *data = dev_get_priv(dev);
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+
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+ mpc85xx_gpio_set_in(data->base, gpio_mask(gpio));
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+ return 0;
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+}
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+
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+static int mpc85xx_gpio_set_value(struct udevice *dev, unsigned gpio,
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+ int value)
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+{
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+ struct mpc85xx_gpio_data *data = dev_get_priv(dev);
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+
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+ if (value) {
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+ data->dat_shadow |= gpio_mask(gpio);
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+ mpc85xx_gpio_set_high(data->base, gpio_mask(gpio));
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+ } else {
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+ data->dat_shadow &= ~gpio_mask(gpio);
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+ mpc85xx_gpio_set_low(data->base, gpio_mask(gpio));
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+ }
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+ return 0;
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+}
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+
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+static int mpc85xx_gpio_direction_output(struct udevice *dev, unsigned gpio,
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+ int value)
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+{
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+ return mpc85xx_gpio_set_value(dev, gpio, value);
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+}
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+
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+static int mpc85xx_gpio_get_value(struct udevice *dev, unsigned gpio)
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+{
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+ struct mpc85xx_gpio_data *data = dev_get_priv(dev);
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+
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+ if (!!mpc85xx_gpio_get_dir(data->base, gpio_mask(gpio))) {
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+ /* Output -> use shadowed value */
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+ return !!(data->dat_shadow & gpio_mask(gpio));
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+ } else {
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+ /* Input -> read value from GPDAT register */
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+ return !!mpc85xx_gpio_get_val(data->base, gpio_mask(gpio));
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+ }
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+}
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+
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+static int mpc85xx_gpio_get_open_drain(struct udevice *dev, unsigned gpio)
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+{
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+ struct mpc85xx_gpio_data *data = dev_get_priv(dev);
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+
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+ return !!mpc85xx_gpio_open_drain_val(data->base, gpio_mask(gpio));
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+}
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+
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+static int mpc85xx_gpio_set_open_drain(struct udevice *dev, unsigned gpio,
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+ int value)
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+{
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+ struct mpc85xx_gpio_data *data = dev_get_priv(dev);
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+
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+ if (value) {
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+ mpc85xx_gpio_open_drain_on(data->base, gpio_mask(gpio));
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+ } else {
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+ mpc85xx_gpio_open_drain_off(data->base, gpio_mask(gpio));
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+ }
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+ return 0;
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+}
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+
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+static int mpc85xx_gpio_get_function(struct udevice *dev, unsigned gpio)
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+{
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+ struct mpc85xx_gpio_data *data = dev_get_priv(dev);
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+ int dir;
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+
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+ dir = !!mpc85xx_gpio_get_dir(data->base, gpio_mask(gpio));
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+ return dir ? GPIOF_OUTPUT : GPIOF_INPUT;
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+}
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+
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+static int mpc85xx_gpio_ofdata_to_platdata(struct udevice *dev) {
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+ struct mpc85xx_gpio_data *data = dev_get_priv(dev);
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+ fdt_addr_t addr;
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+ fdt_size_t size;
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+
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+ addr = fdtdec_get_addr_size_auto_noparent(gd->fdt_blob, dev->of_offset,
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+ "reg", 0, &size);
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+
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+ data->addr = addr;
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+ data->base = map_sysmem(CONFIG_SYS_IMMR + addr, size);
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+
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+ if (!data->base)
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+ return -ENOMEM;
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+
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+ data->gpio_count = fdtdec_get_int(gd->fdt_blob, dev->of_offset,
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+ "ngpios", 32);
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+ data->dat_shadow = 0;
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+
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+ return 0;
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+}
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+
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+static int mpc85xx_gpio_probe(struct udevice *dev)
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+{
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+ struct gpio_dev_priv *uc_priv = dev_get_uclass_priv(dev);
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+ struct mpc85xx_gpio_data *data = dev_get_priv(dev);
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+ char name[32], *str;
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+
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+ snprintf(name, sizeof(name), "MPC@%lx_", data->addr);
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+ str = strdup(name);
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+
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+ if (!str)
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+ return -ENOMEM;
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+
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+ uc_priv->bank_name = str;
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+ uc_priv->gpio_count = data->gpio_count;
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+
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+ return 0;
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+}
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+
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+static const struct dm_gpio_ops gpio_mpc85xx_ops = {
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+ .direction_input = mpc85xx_gpio_direction_input,
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+ .direction_output = mpc85xx_gpio_direction_output,
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+ .get_value = mpc85xx_gpio_get_value,
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+ .set_value = mpc85xx_gpio_set_value,
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+ .get_open_drain = mpc85xx_gpio_get_open_drain,
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+ .set_open_drain = mpc85xx_gpio_set_open_drain,
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+ .get_function = mpc85xx_gpio_get_function,
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+};
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+
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+static const struct udevice_id mpc85xx_gpio_ids[] = {
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+ { .compatible = "fsl,pq3-gpio" },
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+ { /* sentinel */ }
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+};
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+
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+U_BOOT_DRIVER(gpio_mpc85xx) = {
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+ .name = "gpio_mpc85xx",
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+ .id = UCLASS_GPIO,
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+ .ops = &gpio_mpc85xx_ops,
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+ .ofdata_to_platdata = mpc85xx_gpio_ofdata_to_platdata,
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+ .of_match = mpc85xx_gpio_ids,
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+ .probe = mpc85xx_gpio_probe,
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+ .priv_auto_alloc_size = sizeof(struct mpc85xx_gpio_data),
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+};
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