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92 lines
1.9 KiB
C
92 lines
1.9 KiB
C
/*
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* Copyright (C) 2007, OpenWrt.org, Florian Fainelli <florian@openwrt.org>
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* RDC321x architecture specific GPIO support
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License as published by the
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* Free Software Foundation; either version 2 of the License, or (at your
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* option) any later version.
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*/
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#include <linux/autoconf.h>
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#include <linux/init.h>
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#include <linux/io.h>
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#include <linux/types.h>
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#include <linux/module.h>
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#include <linux/delay.h>
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#include <asm/mach-rdc/rdc321x_defs.h>
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static inline int rdc_gpio_is_valid(unsigned gpio)
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{
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return (gpio <= RDC_MAX_GPIO);
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}
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static unsigned int rdc_gpio_read(unsigned gpio)
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{
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unsigned int val;
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val = 0x80000000 | (7 << 11) | ((gpio&0x20?0x84:0x48));
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outl(val, RDC3210_CFGREG_ADDR);
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udelay(10);
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val = inl(RDC3210_CFGREG_DATA);
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val |= (0x1 << (gpio & 0x1F));
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outl(val, RDC3210_CFGREG_DATA);
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udelay(10);
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val = 0x80000000 | (7 << 11) | ((gpio&0x20?0x88:0x4C));
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outl(val, RDC3210_CFGREG_ADDR);
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udelay(10);
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val = inl(RDC3210_CFGREG_DATA);
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return val;
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}
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static void rdc_gpio_write(unsigned int val)
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{
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if (val) {
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outl(val, RDC3210_CFGREG_DATA);
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udelay(10);
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}
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}
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int rdc_gpio_get_value(unsigned gpio)
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{
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if (rdc_gpio_is_valid(gpio))
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return (int)rdc_gpio_read(gpio);
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else
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return -EINVAL;
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}
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EXPORT_SYMBOL(rdc_gpio_get_value);
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void rdc_gpio_set_value(unsigned gpio, int value)
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{
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unsigned int val;
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if (!rdc_gpio_is_valid(gpio))
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return;
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val = rdc_gpio_read(gpio);
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if (value)
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val &= ~(0x1 << (gpio & 0x1F));
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else
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val |= (0x1 << (gpio & 0x1F));
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rdc_gpio_write(val);
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}
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EXPORT_SYMBOL(rdc_gpio_set_value);
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int rdc_gpio_direction_input(unsigned gpio)
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{
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return 0;
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}
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EXPORT_SYMBOL(rdc_gpio_direction_input);
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int rdc_gpio_direction_output(unsigned gpio, int value)
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{
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return 0;
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}
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EXPORT_SYMBOL(rdc_gpio_direction_output);
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