gpio: mpc85xx: Rename driver file to mpc8xxx

In preparation to making the MPC85xx GPIO driver useable for a broader
range of SoCs, rename the driver file.

Signed-off-by: Mario Six <mario.six@gdsys.cc>

1 files changed, 253 insertions, 0 deletions

diff --git a/drivers/gpio/mpc8xxx_gpio.c b/drivers/gpio/mpc8xxx_gpio.c
new file mode 100644
index 0000000..4566c09
--- /dev/null
+++ b/drivers/gpio/mpc8xxx_gpio.c
@@ -0,0 +1,253 @@
+/*
+ * (C) Copyright 2016
+ * Mario Six, Guntermann & Drunck GmbH, six@gdsys.de
+ *
+ * based on arch/powerpc/include/asm/mpc85xx_gpio.h, which is
+ *
+ * Copyright 2010 eXMeritus, A Boeing Company
+ *
+ * SPDX-License-Identifier:	GPL-2.0+
+ */
+
+#include <common.h>
+#include <dm.h>
+#include <asm/gpio.h>
+#include <mapmem.h>
+
+DECLARE_GLOBAL_DATA_PTR;
+
+struct ccsr_gpio {
+	u32	gpdir;
+	u32	gpodr;
+	u32	gpdat;
+	u32	gpier;
+	u32	gpimr;
+	u32	gpicr;
+};
+
+struct mpc85xx_gpio_data {
+	/* The bank's register base in memory */
+	struct ccsr_gpio __iomem *base;
+	/* The address of the registers; used to identify the bank */
+	ulong addr;
+	/* The GPIO count of the bank */
+	uint gpio_count;
+	/* The GPDAT register cannot be used to determine the value of output
+	 * pins on MPC8572/MPC8536, so we shadow it and use the shadowed value
+	 * for output pins
+	 */
+	u32 dat_shadow;
+};
+
+inline u32 gpio_mask(uint gpio)
+{
+	return (1U << (31 - (gpio)));
+}
+
+static inline u32 mpc85xx_gpio_get_val(struct ccsr_gpio *base, u32 mask)
+{
+	return in_be32(&base->gpdat) & mask;
+}
+
+static inline u32 mpc85xx_gpio_get_dir(struct ccsr_gpio *base, u32 mask)
+{
+	return in_be32(&base->gpdir) & mask;
+}
+
+static inline void mpc85xx_gpio_set_in(struct ccsr_gpio *base, u32 gpios)
+{
+	clrbits_be32(&base->gpdat, gpios);
+	/* GPDIR register 0 -> input */
+	clrbits_be32(&base->gpdir, gpios);
+}
+
+static inline void mpc85xx_gpio_set_low(struct ccsr_gpio *base, u32 gpios)
+{
+	clrbits_be32(&base->gpdat, gpios);
+	/* GPDIR register 1 -> output */
+	setbits_be32(&base->gpdir, gpios);
+}
+
+static inline void mpc85xx_gpio_set_high(struct ccsr_gpio *base, u32 gpios)
+{
+	setbits_be32(&base->gpdat, gpios);
+	/* GPDIR register 1 -> output */
+	setbits_be32(&base->gpdir, gpios);
+}
+
+static inline int mpc85xx_gpio_open_drain_val(struct ccsr_gpio *base, u32 mask)
+{
+	return in_be32(&base->gpodr) & mask;
+}
+
+static inline void mpc85xx_gpio_open_drain_on(struct ccsr_gpio *base, u32
+					      gpios)
+{
+	/* GPODR register 1 -> open drain on */
+	setbits_be32(&base->gpodr, gpios);
+}
+
+static inline void mpc85xx_gpio_open_drain_off(struct ccsr_gpio *base,
+					       u32 gpios)
+{
+	/* GPODR register 0 -> open drain off (actively driven) */
+	clrbits_be32(&base->gpodr, gpios);
+}
+
+static int mpc85xx_gpio_direction_input(struct udevice *dev, uint gpio)
+{
+	struct mpc85xx_gpio_data *data = dev_get_priv(dev);
+
+	mpc85xx_gpio_set_in(data->base, gpio_mask(gpio));
+	return 0;
+}
+
+static int mpc85xx_gpio_set_value(struct udevice *dev, uint gpio, int value)
+{
+	struct mpc85xx_gpio_data *data = dev_get_priv(dev);
+
+	if (value) {
+		data->dat_shadow |= gpio_mask(gpio);
+		mpc85xx_gpio_set_high(data->base, gpio_mask(gpio));
+	} else {
+		data->dat_shadow &= ~gpio_mask(gpio);
+		mpc85xx_gpio_set_low(data->base, gpio_mask(gpio));
+	}
+	return 0;
+}
+
+static int mpc85xx_gpio_direction_output(struct udevice *dev, uint gpio,
+					 int value)
+{
+	return mpc85xx_gpio_set_value(dev, gpio, value);
+}
+
+static int mpc85xx_gpio_get_value(struct udevice *dev, uint gpio)
+{
+	struct mpc85xx_gpio_data *data = dev_get_priv(dev);
+
+	if (!!mpc85xx_gpio_get_dir(data->base, gpio_mask(gpio))) {
+		/* Output -> use shadowed value */
+		return !!(data->dat_shadow & gpio_mask(gpio));
+	}
+
+	/* Input -> read value from GPDAT register */
+	return !!mpc85xx_gpio_get_val(data->base, gpio_mask(gpio));
+}
+
+static int mpc85xx_gpio_get_open_drain(struct udevice *dev, uint gpio)
+{
+	struct mpc85xx_gpio_data *data = dev_get_priv(dev);
+
+	return !!mpc85xx_gpio_open_drain_val(data->base, gpio_mask(gpio));
+}
+
+static int mpc85xx_gpio_set_open_drain(struct udevice *dev, uint gpio,
+				       int value)
+{
+	struct mpc85xx_gpio_data *data = dev_get_priv(dev);
+
+	if (value)
+		mpc85xx_gpio_open_drain_on(data->base, gpio_mask(gpio));
+	else
+		mpc85xx_gpio_open_drain_off(data->base, gpio_mask(gpio));
+
+	return 0;
+}
+
+static int mpc85xx_gpio_get_function(struct udevice *dev, uint gpio)
+{
+	struct mpc85xx_gpio_data *data = dev_get_priv(dev);
+	int dir;
+
+	dir = !!mpc85xx_gpio_get_dir(data->base, gpio_mask(gpio));
+	return dir ? GPIOF_OUTPUT : GPIOF_INPUT;
+}
+
+#if CONFIG_IS_ENABLED(OF_CONTROL)
+static int mpc85xx_gpio_ofdata_to_platdata(struct udevice *dev)
+{
+	struct mpc85xx_gpio_plat *plat = dev_get_platdata(dev);
+	fdt_addr_t addr;
+	fdt_size_t size;
+
+	addr = fdtdec_get_addr_size_auto_noparent(gd->fdt_blob,
+						  dev_of_offset(dev),
+						  "reg", 0, &size, false);
+	plat->addr = addr;
+	plat->size = size;
+	plat->ngpios = fdtdec_get_int(gd->fdt_blob, dev_of_offset(dev),
+				      "ngpios", 32);
+
+	return 0;
+}
+#endif
+
+static int mpc85xx_gpio_platdata_to_priv(struct udevice *dev)
+{
+	struct mpc85xx_gpio_data *priv = dev_get_priv(dev);
+	struct mpc85xx_gpio_plat *plat = dev_get_platdata(dev);
+	unsigned long size = plat->size;
+
+	if (size == 0)
+		size = 0x100;
+
+	priv->addr = plat->addr;
+	priv->base = map_sysmem(CONFIG_SYS_IMMR + plat->addr, size);
+
+	if (!priv->base)
+		return -ENOMEM;
+
+	priv->gpio_count = plat->ngpios;
+	priv->dat_shadow = 0;
+
+	return 0;
+}
+
+static int mpc85xx_gpio_probe(struct udevice *dev)
+{
+	struct gpio_dev_priv *uc_priv = dev_get_uclass_priv(dev);
+	struct mpc85xx_gpio_data *data = dev_get_priv(dev);
+	char name[32], *str;
+
+	mpc85xx_gpio_platdata_to_priv(dev);
+
+	snprintf(name, sizeof(name), "MPC@%lx_", data->addr);
+	str = strdup(name);
+
+	if (!str)
+		return -ENOMEM;
+
+	uc_priv->bank_name = str;
+	uc_priv->gpio_count = data->gpio_count;
+
+	return 0;
+}
+
+static const struct dm_gpio_ops gpio_mpc85xx_ops = {
+	.direction_input	= mpc85xx_gpio_direction_input,
+	.direction_output	= mpc85xx_gpio_direction_output,
+	.get_value		= mpc85xx_gpio_get_value,
+	.set_value		= mpc85xx_gpio_set_value,
+	.get_open_drain		= mpc85xx_gpio_get_open_drain,
+	.set_open_drain		= mpc85xx_gpio_set_open_drain,
+	.get_function		= mpc85xx_gpio_get_function,
+};
+
+static const struct udevice_id mpc85xx_gpio_ids[] = {
+	{ .compatible = "fsl,pq3-gpio" },
+	{ /* sentinel */ }
+};
+
+U_BOOT_DRIVER(gpio_mpc85xx) = {
+	.name	= "gpio_mpc85xx",
+	.id	= UCLASS_GPIO,
+	.ops	= &gpio_mpc85xx_ops,
+#if CONFIG_IS_ENABLED(OF_CONTROL)
+	.ofdata_to_platdata = mpc85xx_gpio_ofdata_to_platdata,
+	.platdata_auto_alloc_size = sizeof(struct mpc85xx_gpio_plat),
+	.of_match = mpc85xx_gpio_ids,
+#endif
+	.probe	= mpc85xx_gpio_probe,
+	.priv_auto_alloc_size = sizeof(struct mpc85xx_gpio_data),
+};