157 lines
3.9 KiB
C
157 lines
3.9 KiB
C
/*
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* Copyright (C) 2007, OpenWrt.org, Florian Fainelli <florian@openwrt.org>
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* 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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* THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
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* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
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* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN
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* NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
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* USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
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* ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*
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* You should have received a copy of the GNU General Public License along
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* with this program; if not, write to the Free Software Foundation, Inc.,
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* 675 Mass Ave, Cambridge, MA 02139, USA.
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*
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* Notes :
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* au1000 SoC have only one GPIO line : GPIO1
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* others have a second one : GPIO2
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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 <asm/addrspace.h>
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#include <asm/mach-au1x00/au1000.h>
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#include <asm/gpio.h>
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#define gpio1 sys
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#if !defined(CONFIG_SOC_AU1000)
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static struct au1x00_gpio2 *const gpio2 = (struct au1x00_gpio2 *) GPIO2_BASE;
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#define GPIO2_OUTPUT_ENABLE_MASK 0x00010000
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static int au1xxx_gpio2_read(unsigned gpio)
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{
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gpio -= AU1XXX_GPIO_BASE;
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return ((gpio2->pinstate >> gpio) & 0x01);
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}
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static void au1xxx_gpio2_write(unsigned gpio, int value)
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{
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gpio -= AU1XXX_GPIO_BASE;
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gpio2->output = (GPIO2_OUTPUT_ENABLE_MASK << gpio) | (value << gpio);
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}
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static int au1xxx_gpio2_direction_input(unsigned gpio)
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{
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gpio -= AU1XXX_GPIO_BASE;
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gpio2->dir &= ~(0x01 << gpio);
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return 0;
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}
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static int au1xxx_gpio2_direction_output(unsigned gpio, int value)
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{
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gpio -= AU1XXX_GPIO_BASE;
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gpio2->dir = (0x01 << gpio) | (value << gpio);
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return 0;
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}
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#endif /* !defined(CONFIG_SOC_AU1000) */
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static int au1xxx_gpio1_read(unsigned gpio)
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{
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return ((gpio1->pinstaterd >> gpio) & 0x01);
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}
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static void au1xxx_gpio1_write(unsigned gpio, int value)
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{
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if (value)
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gpio1->outputset = (0x01 << gpio);
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else
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/* Output a zero */
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gpio1->outputclr = (0x01 << gpio);
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}
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static int au1xxx_gpio1_direction_input(unsigned gpio)
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{
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gpio1->pininputen = (0x01 << gpio);
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return 0;
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}
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static int au1xxx_gpio1_direction_output(unsigned gpio, int value)
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{
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gpio1->trioutclr = (0x01 & gpio);
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return 0;
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}
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int au1xxx_gpio_get_value(unsigned gpio)
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{
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if (gpio >= AU1XXX_GPIO_BASE)
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#if defined(CONFIG_SOC_AU1000)
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return 0;
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#else
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return au1xxx_gpio2_read(gpio);
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#endif
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else
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return au1xxx_gpio1_read(gpio);
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}
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EXPORT_SYMBOL(au1xxx_gpio_get_value);
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void au1xxx_gpio_set_value(unsigned gpio, int value)
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{
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if (gpio >= AU1XXX_GPIO_BASE)
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#if defined(CONFIG_SOC_AU1000)
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;
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#else
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au1xxx_gpio2_write(gpio, value);
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#endif
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else
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au1xxx_gpio1_write(gpio, value);
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}
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EXPORT_SYMBOL(au1xxx_gpio_set_value);
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int au1xxx_gpio_direction_input(unsigned gpio)
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{
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if (gpio >= AU1XXX_GPIO_BASE)
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#if defined(CONFIG_SOC_AU1000)
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return -ENODEV;
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#else
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return au1xxx_gpio2_direction_input(gpio);
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#endif
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return au1xxx_gpio1_direction_input(gpio);
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}
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EXPORT_SYMBOL(au1xxx_gpio_direction_input);
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int au1xxx_gpio_direction_output(unsigned gpio, int value)
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{
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if (gpio >= AU1XXX_GPIO_BASE)
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#if defined(CONFIG_SOC_AU1000)
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return -ENODEV;
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#else
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return au1xxx_gpio2_direction_output(gpio, value);
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#endif
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return au1xxx_gpio1_direction_output(gpio, value);
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}
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EXPORT_SYMBOL(au1xxx_gpio_direction_output);
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