[U-Boot] [PATCH v2 1/2] mpc83xx: Add a GPIO driver for the MPC83XX family
Joe Hershberger
joe.hershberger at ni.com
Wed Aug 10 01:52:11 CEST 2011
Signed-off-by: Joe Hershberger <joe.hershberger at ni.com>
Cc: Joe Hershberger <joe.hershberger at gmail.com>
Cc: Kim Phillips <kim.phillips at freescale.com>
---
Changes for v2:
- Improved names of INIT constants (to include "CONFIG_")
- Moved changes to board/freescale/mpc8313erdb/mpc8313erdb.c to patch 2/2
arch/powerpc/include/asm/arch-mpc83xx/gpio.h | 37 +++++
arch/powerpc/include/asm/gpio.h | 38 +++++
drivers/gpio/Makefile | 1 +
drivers/gpio/mpc83xx_gpio.c | 198 ++++++++++++++++++++++++++
4 files changed, 274 insertions(+), 0 deletions(-)
create mode 100644 arch/powerpc/include/asm/arch-mpc83xx/gpio.h
create mode 100644 arch/powerpc/include/asm/gpio.h
create mode 100644 drivers/gpio/mpc83xx_gpio.c
diff --git a/arch/powerpc/include/asm/arch-mpc83xx/gpio.h b/arch/powerpc/include/asm/arch-mpc83xx/gpio.h
new file mode 100644
index 0000000..4319d07
--- /dev/null
+++ b/arch/powerpc/include/asm/arch-mpc83xx/gpio.h
@@ -0,0 +1,37 @@
+/*
+ * 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 gpio_init_f(void);
+void gpio_init_r(void);
+
+#endif /* MPC83XX_GPIO_H_ */
diff --git a/arch/powerpc/include/asm/gpio.h b/arch/powerpc/include/asm/gpio.h
new file mode 100644
index 0000000..eb071d1
--- /dev/null
+++ b/arch/powerpc/include/asm/gpio.h
@@ -0,0 +1,38 @@
+/*
+ * Copyright (c) 2011, NVIDIA Corp. All rights reserved.
+ * 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
+ */
+
+#ifndef _GPIO_H_
+#define _GPIO_H_
+
+#include <asm/arch/gpio.h>
+/*
+ * Generic GPIO API
+ */
+
+int gpio_request(int gp, const char *label);
+void gpio_free(int gp);
+void gpio_toggle_value(int gp);
+int gpio_direction_input(int gp);
+int gpio_direction_output(int gp, int value);
+int gpio_get_value(int gp);
+void gpio_set_value(int gp, int value);
+
+#endif /* _GPIO_H_ */
diff --git a/drivers/gpio/Makefile b/drivers/gpio/Makefile
index 62ec97d..563b8ec 100644
--- a/drivers/gpio/Makefile
+++ b/drivers/gpio/Makefile
@@ -33,6 +33,7 @@ COBJS-$(CONFIG_PCA953X) += pca953x.o
COBJS-$(CONFIG_S5P) += s5p_gpio.o
COBJS-$(CONFIG_TEGRA2_GPIO) += tegra2_gpio.o
COBJS-$(CONFIG_DA8XX_GPIO) += da8xx_gpio.o
+COBJS-$(CONFIG_MPC83XX_GPIO) += mpc83xx_gpio.o
COBJS := $(COBJS-y)
SRCS := $(COBJS:.o=.c)
diff --git a/drivers/gpio/mpc83xx_gpio.c b/drivers/gpio/mpc83xx_gpio.c
new file mode 100644
index 0000000..f6d7491
--- /dev/null
+++ b/drivers/gpio/mpc83xx_gpio.c
@@ -0,0 +1,198 @@
+/*
+ * 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>
+
+#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(int gp, const char *label)
+{
+ if (gp >= MAX_NUM_GPIOS)
+ return -1;
+
+ return 0;
+}
+
+void gpio_free(int gp)
+{
+}
+
+/* set GPIO pin 'gp' as an input */
+int gpio_direction_input(int gp)
+{
+ volatile immap_t *im = (immap_t *)CONFIG_SYS_IMMR;
+ unsigned int ctrlr;
+ unsigned int line;
+ unsigned int lineMask;
+
+ /* 32-bits per controller */
+ ctrlr = gp >> 5;
+ line = gp & (0x1F);
+
+ /* Big endian */
+ lineMask = 1 << (31 - line);
+
+ im->gpio[ctrlr].dir &= ~lineMask;
+
+ return 0;
+}
+
+void gpio_toggle_value(int gp)
+{
+ gpio_set_value(gp, !gpio_get_value(gp));
+}
+
+/* set GPIO pin 'gp' as an output, with polarity 'value' */
+int gpio_direction_output(int gp, int value)
+{
+ volatile immap_t *im = (immap_t *)CONFIG_SYS_IMMR;
+ unsigned int ctrlr;
+ unsigned int line;
+ unsigned int lineMask;
+
+ if (value != 0 && value != 1) {
+ printf("Error: Value parameter must be 0 or 1.\n");
+ return -1;
+ }
+
+ gpio_set_value(gp, value);
+
+ /* 32-bits per controller */
+ ctrlr = gp >> 5;
+ line = gp & (0x1F);
+
+ /* Big endian */
+ lineMask = 1 << (31 - line);
+
+ /* Make the line output */
+ im->gpio[ctrlr].dir |= lineMask;
+
+ return 0;
+}
+
+/* read GPIO IN value of pin 'gp' */
+int gpio_get_value(int gp)
+{
+ volatile immap_t *im = (immap_t *)CONFIG_SYS_IMMR;
+ unsigned int ctrlr;
+ unsigned int line;
+ unsigned int lineMask;
+
+ /* 32-bits per controller */
+ ctrlr = gp >> 5;
+ line = gp & (0x1F);
+
+ /* Big endian */
+ lineMask = 1 << (31 - line);
+
+ /* Read the value and mask off the bit */
+ return (im->gpio[ctrlr].dat & lineMask) != 0;
+}
+
+/* write GPIO OUT value to pin 'gp' */
+void gpio_set_value(int gp, int value)
+{
+ volatile immap_t *im = (immap_t *)CONFIG_SYS_IMMR;
+ unsigned int ctrlr;
+ unsigned int line;
+ unsigned int lineMask;
+
+ if (value != 0 && value != 1) {
+ printf("Error: Value parameter must be 0 or 1.\n");
+ return;
+ }
+
+ /* 32-bits per controller */
+ ctrlr = gp >> 5;
+ line = gp & (0x1F);
+
+ /* Big endian */
+ lineMask = 1 << (31 - line);
+
+ /* Update the local output buffer soft copy */
+ gpio_output_value[ctrlr] =
+ (gpio_output_value[ctrlr] & ~lineMask) | (value ? lineMask : 0);
+
+ /* Write the output */
+ im->gpio[ctrlr].dat = gpio_output_value[ctrlr];
+}
+
+/* Configure GPIO registers early */
+void gpio_init_f()
+{
+ volatile immap_t *im = (immap_t *)CONFIG_SYS_IMMR;
+
+#if MPC83XX_GPIO_CTRLRS >= 1
+ im->gpio[0].dir = CONFIG_MPC83XX_GPIO_0_INIT_DIRECTION;
+ im->gpio[0].odr = CONFIG_MPC83XX_GPIO_0_INIT_OPEN_DRAIN;
+ im->gpio[0].dat = CONFIG_MPC83XX_GPIO_0_INIT_VALUE;
+ im->gpio[0].ier = 0xFFFFFFFF; /* Clear all events */
+ im->gpio[0].imr = 0;
+ im->gpio[0].icr = 0;
+#endif
+
+#if MPC83XX_GPIO_CTRLRS >= 2
+ im->gpio[1].dir = CONFIG_MPC83XX_GPIO_1_INIT_DIRECTION;
+ im->gpio[1].odr = CONFIG_MPC83XX_GPIO_1_INIT_OPEN_DRAIN;
+ im->gpio[1].dat = CONFIG_MPC83XX_GPIO_1_INIT_VALUE;
+ im->gpio[1].ier = 0xFFFFFFFF; /* Clear all events */
+ im->gpio[1].imr = 0;
+ im->gpio[1].icr = 0;
+#endif
+}
+
+/* Initialize GPIO soft-copies */
+void 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
+}
--
1.6.0.2
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