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Linux/arch/mips/rb532/gpio.c

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  1 /*
  2  *  Miscellaneous functions for IDT EB434 board
  3  *
  4  *  Copyright 2004 IDT Inc. (rischelp@idt.com)
  5  *  Copyright 2006 Phil Sutter <n0-1@freewrt.org>
  6  *  Copyright 2007 Florian Fainelli <florian@openwrt.org>
  7  *
  8  *  This program is free software; you can redistribute  it and/or modify it
  9  *  under  the terms of  the GNU General  Public License as published by the
 10  *  Free Software Foundation;  either version 2 of the  License, or (at your
 11  *  option) any later version.
 12  *
 13  *  THIS  SOFTWARE  IS PROVIDED   ``AS  IS'' AND   ANY  EXPRESS OR IMPLIED
 14  *  WARRANTIES,   INCLUDING, BUT NOT  LIMITED  TO, THE IMPLIED WARRANTIES OF
 15  *  MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.  IN
 16  *  NO  EVENT  SHALL   THE AUTHOR  BE    LIABLE FOR ANY   DIRECT, INDIRECT,
 17  *  INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
 18  *  NOT LIMITED   TO, PROCUREMENT OF  SUBSTITUTE GOODS  OR SERVICES; LOSS OF
 19  *  USE, DATA,  OR PROFITS; OR  BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
 20  *  ANY THEORY OF LIABILITY, WHETHER IN  CONTRACT, STRICT LIABILITY, OR TORT
 21  *  (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
 22  *  THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 23  *
 24  *  You should have received a copy of the  GNU General Public License along
 25  *  with this program; if not, write  to the Free Software Foundation, Inc.,
 26  *  675 Mass Ave, Cambridge, MA 02139, USA.
 27  */
 28 
 29 #include <linux/kernel.h>
 30 #include <linux/init.h>
 31 #include <linux/types.h>
 32 #include <linux/export.h>
 33 #include <linux/spinlock.h>
 34 #include <linux/platform_device.h>
 35 #include <linux/gpio.h>
 36 
 37 #include <asm/mach-rc32434/rb.h>
 38 #include <asm/mach-rc32434/gpio.h>
 39 
 40 struct rb532_gpio_chip {
 41         struct gpio_chip chip;
 42         void __iomem     *regbase;
 43 };
 44 
 45 static struct resource rb532_gpio_reg0_res[] = {
 46         {
 47                 .name   = "gpio_reg0",
 48                 .start  = REGBASE + GPIOBASE,
 49                 .end    = REGBASE + GPIOBASE + sizeof(struct rb532_gpio_reg) - 1,
 50                 .flags  = IORESOURCE_MEM,
 51         }
 52 };
 53 
 54 /* rb532_set_bit - sanely set a bit
 55  *
 56  * bitval: new value for the bit
 57  * offset: bit index in the 4 byte address range
 58  * ioaddr: 4 byte aligned address being altered
 59  */
 60 static inline void rb532_set_bit(unsigned bitval,
 61                 unsigned offset, void __iomem *ioaddr)
 62 {
 63         unsigned long flags;
 64         u32 val;
 65 
 66         local_irq_save(flags);
 67 
 68         val = readl(ioaddr);
 69         val &= ~(!bitval << offset);   /* unset bit if bitval == 0 */
 70         val |= (!!bitval << offset);   /* set bit if bitval == 1 */
 71         writel(val, ioaddr);
 72 
 73         local_irq_restore(flags);
 74 }
 75 
 76 /* rb532_get_bit - read a bit
 77  *
 78  * returns the boolean state of the bit, which may be > 1
 79  */
 80 static inline int rb532_get_bit(unsigned offset, void __iomem *ioaddr)
 81 {
 82         return (readl(ioaddr) & (1 << offset));
 83 }
 84 
 85 /*
 86  * Return GPIO level */
 87 static int rb532_gpio_get(struct gpio_chip *chip, unsigned offset)
 88 {
 89         struct rb532_gpio_chip  *gpch;
 90 
 91         gpch = container_of(chip, struct rb532_gpio_chip, chip);
 92         return rb532_get_bit(offset, gpch->regbase + GPIOD);
 93 }
 94 
 95 /*
 96  * Set output GPIO level
 97  */
 98 static void rb532_gpio_set(struct gpio_chip *chip,
 99                                 unsigned offset, int value)
100 {
101         struct rb532_gpio_chip  *gpch;
102 
103         gpch = container_of(chip, struct rb532_gpio_chip, chip);
104         rb532_set_bit(value, offset, gpch->regbase + GPIOD);
105 }
106 
107 /*
108  * Set GPIO direction to input
109  */
110 static int rb532_gpio_direction_input(struct gpio_chip *chip, unsigned offset)
111 {
112         struct rb532_gpio_chip  *gpch;
113 
114         gpch = container_of(chip, struct rb532_gpio_chip, chip);
115 
116         /* disable alternate function in case it's set */
117         rb532_set_bit(0, offset, gpch->regbase + GPIOFUNC);
118 
119         rb532_set_bit(0, offset, gpch->regbase + GPIOCFG);
120         return 0;
121 }
122 
123 /*
124  * Set GPIO direction to output
125  */
126 static int rb532_gpio_direction_output(struct gpio_chip *chip,
127                                         unsigned offset, int value)
128 {
129         struct rb532_gpio_chip  *gpch;
130 
131         gpch = container_of(chip, struct rb532_gpio_chip, chip);
132 
133         /* disable alternate function in case it's set */
134         rb532_set_bit(0, offset, gpch->regbase + GPIOFUNC);
135 
136         /* set the initial output value */
137         rb532_set_bit(value, offset, gpch->regbase + GPIOD);
138 
139         rb532_set_bit(1, offset, gpch->regbase + GPIOCFG);
140         return 0;
141 }
142 
143 static struct rb532_gpio_chip rb532_gpio_chip[] = {
144         [0] = {
145                 .chip = {
146                         .label                  = "gpio0",
147                         .direction_input        = rb532_gpio_direction_input,
148                         .direction_output       = rb532_gpio_direction_output,
149                         .get                    = rb532_gpio_get,
150                         .set                    = rb532_gpio_set,
151                         .base                   = 0,
152                         .ngpio                  = 32,
153                 },
154         },
155 };
156 
157 /*
158  * Set GPIO interrupt level
159  */
160 void rb532_gpio_set_ilevel(int bit, unsigned gpio)
161 {
162         rb532_set_bit(bit, gpio, rb532_gpio_chip->regbase + GPIOILEVEL);
163 }
164 EXPORT_SYMBOL(rb532_gpio_set_ilevel);
165 
166 /*
167  * Set GPIO interrupt status
168  */
169 void rb532_gpio_set_istat(int bit, unsigned gpio)
170 {
171         rb532_set_bit(bit, gpio, rb532_gpio_chip->regbase + GPIOISTAT);
172 }
173 EXPORT_SYMBOL(rb532_gpio_set_istat);
174 
175 /*
176  * Configure GPIO alternate function
177  */
178 void rb532_gpio_set_func(unsigned gpio)
179 {
180        rb532_set_bit(1, gpio, rb532_gpio_chip->regbase + GPIOFUNC);
181 }
182 EXPORT_SYMBOL(rb532_gpio_set_func);
183 
184 int __init rb532_gpio_init(void)
185 {
186         struct resource *r;
187 
188         r = rb532_gpio_reg0_res;
189         rb532_gpio_chip->regbase = ioremap_nocache(r->start, resource_size(r));
190 
191         if (!rb532_gpio_chip->regbase) {
192                 printk(KERN_ERR "rb532: cannot remap GPIO register 0\n");
193                 return -ENXIO;
194         }
195 
196         /* Register our GPIO chip */
197         gpiochip_add(&rb532_gpio_chip->chip);
198 
199         return 0;
200 }
201 arch_initcall(rb532_gpio_init);
202 

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