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https://github.com/brain-hackers/u-boot-brain
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1e8e9bad2d
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>
56 lines
1.1 KiB
C
56 lines
1.1 KiB
C
/*
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* board gpio driver
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*
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* Copyright (C) 2010 Thomas Chou <thomas@wytron.com.tw>
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* Licensed under the GPL-2 or later.
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*/
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#include <common.h>
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#include <asm/io.h>
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#ifndef CONFIG_SYS_GPIO_BASE
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#define ALTERA_PIO_BASE LED_PIO_BASE
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#define ALTERA_PIO_DATA (ALTERA_PIO_BASE + 0)
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#define ALTERA_PIO_DIR (ALTERA_PIO_BASE + 4)
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static u32 pio_data_reg;
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static u32 pio_dir_reg;
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int gpio_direction_input(unsigned gpio)
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{
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u32 mask = 1 << gpio;
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writel(pio_dir_reg &= ~mask, ALTERA_PIO_DIR);
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return 0;
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}
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int gpio_direction_output(unsigned gpio, int value)
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{
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u32 mask = 1 << gpio;
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if (value)
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pio_data_reg |= mask;
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else
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pio_data_reg &= ~mask;
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writel(pio_data_reg, ALTERA_PIO_DATA);
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writel(pio_dir_reg |= mask, ALTERA_PIO_DIR);
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return 0;
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}
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int gpio_get_value(unsigned gpio)
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{
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u32 mask = 1 << gpio;
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if (pio_dir_reg & mask)
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return (pio_data_reg & mask) ? 1 : 0;
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else
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return (readl(ALTERA_PIO_DATA) & mask) ? 1 : 0;
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}
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void gpio_set_value(unsigned gpio, int value)
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{
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u32 mask = 1 << gpio;
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if (value)
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pio_data_reg |= mask;
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else
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pio_data_reg &= ~mask;
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writel(pio_data_reg, ALTERA_PIO_DATA);
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}
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#endif
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