target/linux/rb532/files/arch/mips/rb500/gpio.c

   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/pci.h>
  33 #include <linux/spinlock.h>
  34 #include <linux/io.h>
  35 #include <linux/platform_device.h>
  36
  37 #include <asm/addrspace.h>
  38 #include <asm/gpio.h>
  39
  40 #include <asm/rc32434/rb.h>
  41
  42 #define GPIO_BADDR  0x18050000
  43
  44 static volatile unsigned char *devCtl3Base;
  45 static unsigned char latchU5State;
  46 static spinlock_t clu5Lock;
  47
  48 struct rb500_gpio_reg __iomem *rb500_gpio_reg0;
  49 EXPORT_SYMBOL(rb500_gpio_reg0);
  50
  51 static struct resource rb500_gpio_reg0_res[] = {
  52         {
  53                 .name   = "gpio_reg0",
  54                 .start  = GPIO_BADDR,
  55                 .end    = GPIO_BADDR + sizeof(struct rb500_gpio_reg),
  56                 .flags  = IORESOURCE_MEM,
  57         }
  58 };
  59
  60 void set434Reg(unsigned regOffs, unsigned bit, unsigned len, unsigned val)
  61 {
  62         unsigned flags, data;
  63         unsigned i = 0;
  64
  65         spin_lock_irqsave(&clu5Lock, flags);
  66         data = *(volatile unsigned *) (IDT434_REG_BASE + regOffs);
  67         for (i = 0; i != len; ++i) {
  68                 if (val & (1 << i))
  69                         data |= (1 << (i + bit));
  70                 else
  71                         data &= ~(1 << (i + bit));
  72         }
  73         *(volatile unsigned *) (IDT434_REG_BASE + regOffs) = data;
  74         spin_unlock_irqrestore(&clu5Lock, flags);
  75 }
  76 EXPORT_SYMBOL(set434Reg);
  77
  78 void changeLatchU5(unsigned char orMask, unsigned char nandMask)
  79 {
  80         unsigned flags;
  81
  82         spin_lock_irqsave(&clu5Lock, flags);
  83         latchU5State = (latchU5State | orMask) & ~nandMask;
  84         if (!devCtl3Base)
  85                 devCtl3Base = (volatile unsigned char *)
  86                     KSEG1ADDR(*(volatile unsigned *)
  87                               KSEG1ADDR(0x18010030));
  88         *devCtl3Base = latchU5State;
  89         spin_unlock_irqrestore(&clu5Lock, flags);
  90 }
  91 EXPORT_SYMBOL(changeLatchU5);
  92
  93 unsigned char getLatchU5State(void)
  94 {
  95         return latchU5State;
  96 }
  97 EXPORT_SYMBOL(getLatchU5State);
  98
  99 int rb500_gpio_get_value(unsigned gpio)
 100 {
 101         return readl(&rb500_gpio_reg0->gpiod) & (1 << gpio);
 102 }
 103 EXPORT_SYMBOL(rb500_gpio_get_value);
 104
 105 void rb500_gpio_set_value(unsigned gpio, int value)
 106 {
 107         unsigned tmp;
 108
 109         tmp = readl(&rb500_gpio_reg0->gpiod) & ~(1 << gpio);
 110         if (value)
 111                 tmp |= 1 << gpio;
 112
 113         writel(tmp, (void *)&rb500_gpio_reg0->gpiod);
 114 }
 115 EXPORT_SYMBOL(rb500_gpio_set_value);
 116
 117 int rb500_gpio_direction_input(unsigned gpio)
 118 {
 119         writel(readl(&rb500_gpio_reg0->gpiocfg) | (1 << gpio), (void *)&rb500_gpio_reg0->gpiocfg);
 120
 121         return 0;
 122 }
 123 EXPORT_SYMBOL(rb500_gpio_direction_input);
 124
 125 int rb500_gpio_direction_output(unsigned gpio, int value)
 126 {
 127         gpio_set_value(gpio, value);
 128         writel(readl(&rb500_gpio_reg0->gpiocfg) & ~(1 << gpio), (void *)&rb500_gpio_reg0->gpiocfg);
 129
 130         return 0;
 131 }
 132 EXPORT_SYMBOL(rb500_gpio_direction_output);
 133
 134 void rb500_gpio_set_int_level(unsigned gpio, int value)
 135 {
 136         unsigned tmp;
 137
 138         tmp = readl(&rb500_gpio_reg0->gpioilevel) & ~(1 << gpio);
 139         if (value)
 140                 tmp |= 1 << gpio;
 141         writel(tmp, (void *)&rb500_gpio_reg0->gpioilevel);
 142 }
 143 EXPORT_SYMBOL(rb500_gpio_set_int_level);
 144
 145 int rb500_gpio_get_int_level(unsigned gpio)
 146 {
 147         return readl(&rb500_gpio_reg0->gpioilevel) & (1 << gpio);
 148 }
 149 EXPORT_SYMBOL(rb500_gpio_get_int_level);
 150
 151 void rb500_gpio_set_int_status(unsigned gpio, int value)
 152 {
 153         unsigned tmp;
 154
 155         tmp = readl(&rb500_gpio_reg0->gpioistat);
 156         if (value)
 157                 tmp |= 1 << gpio;
 158         writel(tmp, (void *)&rb500_gpio_reg0->gpioistat);
 159 }
 160 EXPORT_SYMBOL(rb500_gpio_set_int_status);
 161
 162 int rb500_gpio_get_int_status(unsigned gpio)
 163 {
 164         return readl(&rb500_gpio_reg0->gpioistat) & (1 << gpio);
 165 }
 166 EXPORT_SYMBOL(rb500_gpio_get_int_status);
 167
 168 void rb500_gpio_set_func(unsigned gpio, int value)
 169 {
 170         unsigned tmp;
 171
 172         tmp = readl(&rb500_gpio_reg0->gpiofunc);
 173         if (value)
 174                 tmp |= 1 << gpio;
 175         writel(tmp, (void *)&rb500_gpio_reg0->gpiofunc);
 176 }
 177 EXPORT_SYMBOL(rb500_gpio_set_func);
 178
 179 int rb500_gpio_get_func(unsigned gpio)
 180 {
 181         return readl(&rb500_gpio_reg0->gpiofunc) & (1 << gpio);
 182 }
 183 EXPORT_SYMBOL(rb500_gpio_get_func);
 184
 185 int __init rb500_gpio_init(void)
 186 {
 187         rb500_gpio_reg0 = ioremap_nocache(rb500_gpio_reg0_res[0].start,
 188                                 rb500_gpio_reg0_res[0].end -
 189                                 rb500_gpio_reg0_res[0].start);
 190
 191         if (!rb500_gpio_reg0) {
 192                 printk(KERN_ERR "rb500: cannot remap GPIO register 0\n");
 193                 return -ENXIO;
 194         }
 195
 196         return 0;
 197 }
 198 arch_initcall(rb500_gpio_init);