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nios2: add gpio support to nios2-generic board 

This patch adds gpio support of Altera PIO component to the
nios2-generic board. Though it drives only gpio_led at the
moment, it supports bidirectional port to control bit-banging
I2C, NAND flash busy status or button switches, etc.

Signed-off-by: Thomas Chou <thomas@wytron.com.tw>
Tested-by: Ian Abbott <abbotti@mev.co.uk>
Signed-off-by: Scott McNutt <smcnutt@psyent.com>
This commit is contained in:
Thomas Chou 2010-04-30 11:34:15 +08:00 committed by Scott McNutt
parent 3e6b86b555
commit 1e8e9bad2d
3 changed files with 59 additions and 3 deletions
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1
board/altera/nios2-generic/Makefile
View File

@ -32,6 +32,7 @@ LIB = $(obj)lib$(BOARD).a
COBJS-y := $(BOARD).o
COBJS-$(CONFIG_CMD_IDE) += ../common/cfide.o
COBJS-$(CONFIG_EPLED) += ../common/epled.o
COBJS-$(CONFIG_GPIO) += gpio.o
COBJS-$(CONFIG_SEVENSEG) += ../common/sevenseg.o
SOBJS-y := text_base.o

55
board/altera/nios2-generic/gpio.c Normal file
View File

@ -0,0 +1,55 @@
/*
* board gpio driver
*
* Copyright (C) 2010 Thomas Chou <thomas@wytron.com.tw>
* Licensed under the GPL-2 or later.
*/
#include <common.h>
#include <asm/io.h>
#ifndef CONFIG_SYS_GPIO_BASE
#define ALTERA_PIO_BASE LED_PIO_BASE
#define ALTERA_PIO_DATA (ALTERA_PIO_BASE + 0)
#define ALTERA_PIO_DIR (ALTERA_PIO_BASE + 4)
static u32 pio_data_reg;
static u32 pio_dir_reg;
int gpio_direction_input(unsigned gpio)
{
u32 mask = 1 << gpio;
writel(pio_dir_reg &= ~mask, ALTERA_PIO_DIR);
return 0;
}
int gpio_direction_output(unsigned gpio, int value)
{
u32 mask = 1 << gpio;
if (value)
pio_data_reg |= mask;
else
pio_data_reg &= ~mask;
writel(pio_data_reg, ALTERA_PIO_DATA);
writel(pio_dir_reg |= mask, ALTERA_PIO_DIR);
return 0;
}
int gpio_get_value(unsigned gpio)
{
u32 mask = 1 << gpio;
if (pio_dir_reg & mask)
return (pio_data_reg & mask) ? 1 : 0;
else
return (readl(ALTERA_PIO_DATA) & mask) ? 1 : 0;
}
void gpio_set_value(unsigned gpio, int value)
{
u32 mask = 1 << gpio;
if (value)
pio_data_reg |= mask;
else
pio_data_reg &= ~mask;
writel(pio_data_reg, ALTERA_PIO_DATA);
}
#endif

6
include/configs/nios2-generic.h
View File

@ -63,10 +63,10 @@
* STATUS LED
*/
#define CONFIG_STATUS_LED /* Enable status driver */
#define CONFIG_EPLED /* Enable LED PIO driver */
#define CONFIG_SYS_LEDPIO_ADDR LED_PIO_BASE
#define CONFIG_GPIO_LED /* Enable GPIO LED driver */
#define CONFIG_GPIO /* Enable GPIO driver */
#define STATUS_LED_BIT 1 /* Bit-0 on PIO */
#define STATUS_LED_BIT 0 /* Bit-0 on GPIO */
#define STATUS_LED_STATE 1 /* Blinking */
#define STATUS_LED_PERIOD (500 / CONFIG_SYS_NIOS_TMRMS) /* 500 msec */