mpc83xx: Add a GPIO driver for the MPC83XX family

Signed-off-by: Joe Hershberger <joe.hershberger@ni.com>
Cc: Joe Hershberger <joe.hershberger@gmail.com>
Signed-off-by: Kim Phillips <kim.phillips@freescale.com>

arch/powerpc/include/asm/arch-mpc83xx/gpio.h

@@ -0,0 +1,38 @@
+/*
+ * 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
+ */
+
+#ifndef _MPC83XX_GPIO_H_
+#define _MPC83XX_GPIO_H_
+
+/*
+ * The MCP83xx's 1-2 GPIO controllers each with 32 bits.
+ */
+#if defined(CONFIG_MPC8313) || defined(CONFIG_MPC8308) || \
+	defined(CONFIG_MPC8315)
+#define MPC83XX_GPIO_CTRLRS 1
+#elif defined(CONFIG_MPC834x) || defined(CONFIG_MPC837x)
+#define MPC83XX_GPIO_CTRLRS 2
+#else
+#define MPC83XX_GPIO_CTRLRS 0
+#endif
+
+#define MAX_NUM_GPIOS (32 * MPC83XX_GPIO_CTRLRS)
+
+void mpc83xx_gpio_init_f(void);
+void mpc83xx_gpio_init_r(void);
+
+#endif	/* MPC83XX_GPIO_H_ */

arch/powerpc/include/asm/gpio.h

@@ -0,0 +1,2 @@
+#include <asm/arch/gpio.h>
+#include <asm-generic/gpio.h>

drivers/gpio/Makefile

@@ -37,6 +37,7 @@ COBJS-$(CONFIG_S5P)		+= s5p_gpio.o
 COBJS-$(CONFIG_TEGRA2_GPIO)	+= tegra2_gpio.o
 COBJS-$(CONFIG_DA8XX_GPIO)	+= da8xx_gpio.o
 COBJS-$(CONFIG_ALTERA_PIO)	+= altera_pio.o
+COBJS-$(CONFIG_MPC83XX_GPIO)	+= mpc83xx_gpio.o
 
 COBJS	:= $(COBJS-y)
 SRCS 	:= $(COBJS:.o=.c)

drivers/gpio/mpc83xx_gpio.c

@@ -0,0 +1,199 @@
+/*
+ * Freescale MPC83xx GPIO handling.
+ *
+ * See file CREDITS for list of people who contributed to this
+ * project.
+ *
+ * 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 <common.h>
+#include <mpc83xx.h>
+#include <asm/gpio.h>
+#include <asm/io.h>
+
+#ifndef CONFIG_MPC83XX_GPIO_0_INIT_DIRECTION
+#define CONFIG_MPC83XX_GPIO_0_INIT_DIRECTION 0
+#endif
+#ifndef CONFIG_MPC83XX_GPIO_1_INIT_DIRECTION
+#define CONFIG_MPC83XX_GPIO_1_INIT_DIRECTION 0
+#endif
+#ifndef CONFIG_MPC83XX_GPIO_0_INIT_OPEN_DRAIN
+#define CONFIG_MPC83XX_GPIO_0_INIT_OPEN_DRAIN 0
+#endif
+#ifndef CONFIG_MPC83XX_GPIO_1_INIT_OPEN_DRAIN
+#define CONFIG_MPC83XX_GPIO_1_INIT_OPEN_DRAIN 0
+#endif
+#ifndef CONFIG_MPC83XX_GPIO_0_INIT_VALUE
+#define CONFIG_MPC83XX_GPIO_0_INIT_VALUE 0
+#endif
+#ifndef CONFIG_MPC83XX_GPIO_1_INIT_VALUE
+#define CONFIG_MPC83XX_GPIO_1_INIT_VALUE 0
+#endif
+
+static unsigned int gpio_output_value[MPC83XX_GPIO_CTRLRS];
+
+/*
+ * Generic_GPIO primitives.
+ */
+
+int gpio_request(unsigned gpio, const char *label)
+{
+	if (gpio >= MAX_NUM_GPIOS)
+		return -1;
+
+	return 0;
+}
+
+int gpio_free(unsigned gpio)
+{
+	/* Do not set to input */
+	return 0;
+}
+
+/* set GPIO pin 'gpio' as an input */
+int gpio_direction_input(unsigned gpio)
+{
+	immap_t *im = (immap_t *)CONFIG_SYS_IMMR;
+	unsigned int ctrlr;
+	unsigned int line;
+	unsigned int line_mask;
+
+	/* 32-bits per controller */
+	ctrlr = gpio >> 5;
+	line = gpio & (0x1F);
+
+	/* Big endian */
+	line_mask = 1 << (31 - line);
+
+	clrbits_be32(&im->gpio[ctrlr].dir, line_mask);
+
+	return 0;
+}
+
+/* set GPIO pin 'gpio' as an output, with polarity 'value' */
+int gpio_direction_output(unsigned gpio, int value)
+{
+	immap_t *im = (immap_t *)CONFIG_SYS_IMMR;
+	unsigned int ctrlr;
+	unsigned int line;
+	unsigned int line_mask;
+
+	if (value != 0 && value != 1) {
+		printf("Error: Value parameter must be 0 or 1.\n");
+		return -1;
+	}
+
+	gpio_set_value(gpio, value);
+
+	/* 32-bits per controller */
+	ctrlr = gpio >> 5;
+	line = gpio & (0x1F);
+
+	/* Big endian */
+	line_mask = 1 << (31 - line);
+
+	/* Make the line output */
+	setbits_be32(&im->gpio[ctrlr].dir, line_mask);
+
+	return 0;
+}
+
+/* read GPIO IN value of pin 'gpio' */
+int gpio_get_value(unsigned gpio)
+{
+	immap_t *im = (immap_t *)CONFIG_SYS_IMMR;
+	unsigned int ctrlr;
+	unsigned int line;
+	unsigned int line_mask;
+
+	/* 32-bits per controller */
+	ctrlr = gpio >> 5;
+	line = gpio & (0x1F);
+
+	/* Big endian */
+	line_mask = 1 << (31 - line);
+
+	/* Read the value and mask off the bit */
+	return (in_be32(&im->gpio[ctrlr].dat) & line_mask) != 0;
+}
+
+/* write GPIO OUT value to pin 'gpio' */
+int gpio_set_value(unsigned gpio, int value)
+{
+	immap_t *im = (immap_t *)CONFIG_SYS_IMMR;
+	unsigned int ctrlr;
+	unsigned int line;
+	unsigned int line_mask;
+
+	if (value != 0 && value != 1) {
+		printf("Error: Value parameter must be 0 or 1.\n");
+		return -1;
+	}
+
+	/* 32-bits per controller */
+	ctrlr = gpio >> 5;
+	line = gpio & (0x1F);
+
+	/* Big endian */
+	line_mask = 1 << (31 - line);
+
+	/* Update the local output buffer soft copy */
+	gpio_output_value[ctrlr] =
+		(gpio_output_value[ctrlr] & ~line_mask) | \
+			(value ? line_mask : 0);
+
+	/* Write the output */
+	out_be32(&im->gpio[ctrlr].dat, gpio_output_value[ctrlr]);
+
+	return 0;
+}
+
+/* Configure GPIO registers early */
+void mpc83xx_gpio_init_f()
+{
+	immap_t *im = (immap_t *)CONFIG_SYS_IMMR;
+
+#if MPC83XX_GPIO_CTRLRS >= 1
+	out_be32(&im->gpio[0].dir, CONFIG_MPC83XX_GPIO_0_INIT_DIRECTION);
+	out_be32(&im->gpio[0].odr, CONFIG_MPC83XX_GPIO_0_INIT_OPEN_DRAIN);
+	out_be32(&im->gpio[0].dat, CONFIG_MPC83XX_GPIO_0_INIT_VALUE);
+	out_be32(&im->gpio[0].ier, 0xFFFFFFFF); /* Clear all events */
+	out_be32(&im->gpio[0].imr, 0);
+	out_be32(&im->gpio[0].icr, 0);
+#endif
+
+#if MPC83XX_GPIO_CTRLRS >= 2
+	out_be32(&im->gpio[1].dir, CONFIG_MPC83XX_GPIO_1_INIT_DIRECTION);
+	out_be32(&im->gpio[1].odr, CONFIG_MPC83XX_GPIO_1_INIT_OPEN_DRAIN);
+	out_be32(&im->gpio[1].dat, CONFIG_MPC83XX_GPIO_1_INIT_VALUE);
+	out_be32(&im->gpio[1].ier, 0xFFFFFFFF); /* Clear all events */
+	out_be32(&im->gpio[1].imr, 0);
+	out_be32(&im->gpio[1].icr, 0);
+#endif
+}
+
+/* Initialize GPIO soft-copies */
+void mpc83xx_gpio_init_r()
+{
+#if MPC83XX_GPIO_CTRLRS >= 1
+	gpio_output_value[0] = CONFIG_MPC83XX_GPIO_0_INIT_VALUE;
+#endif
+
+#if MPC83XX_GPIO_CTRLRS >= 2
+	gpio_output_value[1] = CONFIG_MPC83XX_GPIO_1_INIT_VALUE;
+#endif
+}