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207 lines
5.3 KiB
207 lines
5.3 KiB
/* |
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* Miscellaneous functions for IDT EB434 board |
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* |
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* Copyright 2004 IDT Inc. ([email protected]) |
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* Copyright 2006 Phil Sutter <[email protected]> |
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* Copyright 2007 Florian Fainelli <[email protected]> |
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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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#include <linux/kernel.h> |
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#include <linux/init.h> |
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#include <linux/types.h> |
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#include <linux/export.h> |
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#include <linux/spinlock.h> |
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#include <linux/platform_device.h> |
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#include <linux/gpio/driver.h> |
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#include <asm/mach-rc32434/rb.h> |
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#include <asm/mach-rc32434/gpio.h> |
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struct rb532_gpio_chip { |
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struct gpio_chip chip; |
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void __iomem *regbase; |
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}; |
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static struct resource rb532_gpio_reg0_res[] = { |
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{ |
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.name = "gpio_reg0", |
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.start = REGBASE + GPIOBASE, |
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.end = REGBASE + GPIOBASE + sizeof(struct rb532_gpio_reg) - 1, |
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.flags = IORESOURCE_MEM, |
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} |
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}; |
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/* rb532_set_bit - sanely set a bit |
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* |
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* bitval: new value for the bit |
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* offset: bit index in the 4 byte address range |
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* ioaddr: 4 byte aligned address being altered |
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*/ |
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static inline void rb532_set_bit(unsigned bitval, |
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unsigned offset, void __iomem *ioaddr) |
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{ |
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unsigned long flags; |
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u32 val; |
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local_irq_save(flags); |
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val = readl(ioaddr); |
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val &= ~(!bitval << offset); /* unset bit if bitval == 0 */ |
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val |= (!!bitval << offset); /* set bit if bitval == 1 */ |
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writel(val, ioaddr); |
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local_irq_restore(flags); |
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} |
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/* rb532_get_bit - read a bit |
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* |
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* returns the boolean state of the bit, which may be > 1 |
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*/ |
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static inline int rb532_get_bit(unsigned offset, void __iomem *ioaddr) |
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{ |
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return readl(ioaddr) & (1 << offset); |
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} |
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/* |
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* Return GPIO level */ |
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static int rb532_gpio_get(struct gpio_chip *chip, unsigned offset) |
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{ |
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struct rb532_gpio_chip *gpch; |
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gpch = gpiochip_get_data(chip); |
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return !!rb532_get_bit(offset, gpch->regbase + GPIOD); |
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} |
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/* |
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* Set output GPIO level |
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*/ |
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static void rb532_gpio_set(struct gpio_chip *chip, |
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unsigned offset, int value) |
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{ |
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struct rb532_gpio_chip *gpch; |
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gpch = gpiochip_get_data(chip); |
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rb532_set_bit(value, offset, gpch->regbase + GPIOD); |
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} |
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/* |
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* Set GPIO direction to input |
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*/ |
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static int rb532_gpio_direction_input(struct gpio_chip *chip, unsigned offset) |
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{ |
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struct rb532_gpio_chip *gpch; |
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gpch = gpiochip_get_data(chip); |
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/* disable alternate function in case it's set */ |
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rb532_set_bit(0, offset, gpch->regbase + GPIOFUNC); |
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rb532_set_bit(0, offset, gpch->regbase + GPIOCFG); |
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return 0; |
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} |
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/* |
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* Set GPIO direction to output |
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*/ |
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static int rb532_gpio_direction_output(struct gpio_chip *chip, |
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unsigned offset, int value) |
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{ |
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struct rb532_gpio_chip *gpch; |
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gpch = gpiochip_get_data(chip); |
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/* disable alternate function in case it's set */ |
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rb532_set_bit(0, offset, gpch->regbase + GPIOFUNC); |
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/* set the initial output value */ |
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rb532_set_bit(value, offset, gpch->regbase + GPIOD); |
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rb532_set_bit(1, offset, gpch->regbase + GPIOCFG); |
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return 0; |
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} |
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static int rb532_gpio_to_irq(struct gpio_chip *chip, unsigned gpio) |
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{ |
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return 8 + 4 * 32 + gpio; |
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} |
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static struct rb532_gpio_chip rb532_gpio_chip[] = { |
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[0] = { |
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.chip = { |
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.label = "gpio0", |
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.direction_input = rb532_gpio_direction_input, |
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.direction_output = rb532_gpio_direction_output, |
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.get = rb532_gpio_get, |
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.set = rb532_gpio_set, |
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.to_irq = rb532_gpio_to_irq, |
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.base = 0, |
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.ngpio = 32, |
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}, |
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}, |
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}; |
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/* |
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* Set GPIO interrupt level |
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*/ |
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void rb532_gpio_set_ilevel(int bit, unsigned gpio) |
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{ |
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rb532_set_bit(bit, gpio, rb532_gpio_chip->regbase + GPIOILEVEL); |
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} |
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EXPORT_SYMBOL(rb532_gpio_set_ilevel); |
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/* |
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* Set GPIO interrupt status |
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*/ |
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void rb532_gpio_set_istat(int bit, unsigned gpio) |
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{ |
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rb532_set_bit(bit, gpio, rb532_gpio_chip->regbase + GPIOISTAT); |
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} |
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EXPORT_SYMBOL(rb532_gpio_set_istat); |
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/* |
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* Configure GPIO alternate function |
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*/ |
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void rb532_gpio_set_func(unsigned gpio) |
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{ |
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rb532_set_bit(1, gpio, rb532_gpio_chip->regbase + GPIOFUNC); |
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} |
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EXPORT_SYMBOL(rb532_gpio_set_func); |
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int __init rb532_gpio_init(void) |
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{ |
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struct resource *r; |
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r = rb532_gpio_reg0_res; |
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rb532_gpio_chip->regbase = ioremap(r->start, resource_size(r)); |
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if (!rb532_gpio_chip->regbase) { |
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printk(KERN_ERR "rb532: cannot remap GPIO register 0\n"); |
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return -ENXIO; |
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} |
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/* Register our GPIO chip */ |
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gpiochip_add_data(&rb532_gpio_chip->chip, rb532_gpio_chip); |
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return 0; |
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} |
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arch_initcall(rb532_gpio_init);
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