- 根目录:
- arch
- cris
- arch-v32
- drivers
- mach-a3
- gpio.c
/*
* Artec-3 general port I/O device
*
* Copyright (c) 2007 Axis Communications AB
*
* Authors: Bjorn Wesen (initial version)
* Ola Knutsson (LED handling)
* Johan Adolfsson (read/set directions, write, port G,
* port to ETRAX FS.
* Ricard Wanderlof (PWM for Artpec-3)
*
*/
#include <linux/module.h>
#include <linux/sched.h>
#include <linux/slab.h>
#include <linux/ioport.h>
#include <linux/errno.h>
#include <linux/kernel.h>
#include <linux/fs.h>
#include <linux/string.h>
#include <linux/poll.h>
#include <linux/init.h>
#include <linux/interrupt.h>
#include <linux/spinlock.h>
#include <linux/mutex.h>
#include <asm/etraxgpio.h>
#include <hwregs/reg_map.h>
#include <hwregs/reg_rdwr.h>
#include <hwregs/gio_defs.h>
#include <hwregs/intr_vect_defs.h>
#include <asm/io.h>
#include <asm/irq.h>
#include <mach/pinmux.h>
#ifdef CONFIG_ETRAX_VIRTUAL_GPIO
#include "../i2c.h"
#define VIRT_I2C_ADDR 0x40
#endif
/* The following gio ports on ARTPEC-3 is available:
* pa 32 bits
* pb 32 bits
* pc 16 bits
* each port has a rw_px_dout, r_px_din and rw_px_oe register.
*/
#define GPIO_MAJOR 120 /* experimental MAJOR number */
#define I2C_INTERRUPT_BITS 0x300 /* i2c0_done and i2c1_done bits */
#define D(x)
#if 0
static int dp_cnt;
#define DP(x) \
do { \
dp_cnt++; \
if (dp_cnt % 1000 == 0) \
x; \
} while (0)
#else
#define DP(x)
#endif
static DEFINE_MUTEX(gpio_mutex);
static char gpio_name[] = "etrax gpio";
#ifdef CONFIG_ETRAX_VIRTUAL_GPIO
static int virtual_gpio_ioctl(struct file *file, unsigned int cmd,
unsigned long arg);
#endif
static long gpio_ioctl(struct file *file, unsigned int cmd, unsigned long arg);
static ssize_t gpio_write(struct file *file, const char __user *buf,
size_t count, loff_t *off);
static int gpio_open(struct inode *inode, struct file *filp);
static int gpio_release(struct inode *inode, struct file *filp);
static unsigned int gpio_poll(struct file *filp,
struct poll_table_struct *wait);
/* private data per open() of this driver */
struct gpio_private {
struct gpio_private *next;
/* The IO_CFG_WRITE_MODE_VALUE only support 8 bits: */
unsigned char clk_mask;
unsigned char data_mask;
unsigned char write_msb;
unsigned char pad1;
/* These fields are generic */
unsigned long highalarm, lowalarm;
wait_queue_head_t alarm_wq;
int minor;
};
static void gpio_set_alarm(struct gpio_private *priv);
static int gpio_leds_ioctl(unsigned int cmd, unsigned long arg);
static int gpio_pwm_ioctl(struct gpio_private *priv, unsigned int cmd,
unsigned long arg);
/* linked list of alarms to check for */
static struct gpio_private *alarmlist;
static int wanted_interrupts;
static DEFINE_SPINLOCK(gpio_lock);
#define NUM_PORTS (GPIO_MINOR_LAST+1)
#define GIO_REG_RD_ADDR(reg) \
(unsigned long *)(regi_gio + REG_RD_ADDR_gio_##reg)
#define GIO_REG_WR_ADDR(reg) \
(unsigned long *)(regi_gio + REG_WR_ADDR_gio_##reg)
static unsigned long led_dummy;
static unsigned long port_d_dummy; /* Only input on Artpec-3 */
#ifdef CONFIG_ETRAX_VIRTUAL_GPIO
static unsigned long port_e_dummy; /* Non existent on Artpec-3 */
static unsigned long virtual_dummy;
static unsigned long virtual_rw_pv_oe = CONFIG_ETRAX_DEF_GIO_PV_OE;
static unsigned short cached_virtual_gpio_read;
#endif
static unsigned long *data_out[NUM_PORTS] = {
GIO_REG_WR_ADDR(rw_pa_dout),
GIO_REG_WR_ADDR(rw_pb_dout),
&led_dummy,
GIO_REG_WR_ADDR(rw_pc_dout),
&port_d_dummy,
#ifdef CONFIG_ETRAX_VIRTUAL_GPIO
&port_e_dummy,
&virtual_dummy,
#endif
};
static unsigned long *data_in[NUM_PORTS] = {
GIO_REG_RD_ADDR(r_pa_din),
GIO_REG_RD_ADDR(r_pb_din),
&led_dummy,
GIO_REG_RD_ADDR(r_pc_din),
GIO_REG_RD_ADDR(r_pd_din),
#ifdef CONFIG_ETRAX_VIRTUAL_GPIO
&port_e_dummy,
&virtual_dummy,
#endif
};
static unsigned long changeable_dir[NUM_PORTS] = {
CONFIG_ETRAX_PA_CHANGEABLE_DIR,
CONFIG_ETRAX_PB_CHANGEABLE_DIR,
0,
CONFIG_ETRAX_PC_CHANGEABLE_DIR,
0,
#ifdef CONFIG_ETRAX_VIRTUAL_GPIO
0,
CONFIG_ETRAX_PV_CHANGEABLE_DIR,
#endif
};
static unsigned long changeable_bits[NUM_PORTS] = {
CONFIG_ETRAX_PA_CHANGEABLE_BITS,
CONFIG_ETRAX_PB_CHANGEABLE_BITS,
0,
CONFIG_ETRAX_PC_CHANGEABLE_BITS,
0,
#ifdef CONFIG_ETRAX_VIRTUAL_GPIO
0,
CONFIG_ETRAX_PV_CHANGEABLE_BITS,
#endif
};
static unsigned long *dir_oe[NUM_PORTS] = {
GIO_REG_WR_ADDR(rw_pa_oe),
GIO_REG_WR_ADDR(rw_pb_oe),
&led_dummy,
GIO_REG_WR_ADDR(rw_pc_oe),
&port_d_dummy,
#ifdef CONFIG_ETRAX_VIRTUAL_GPIO
&port_e_dummy,
&virtual_rw_pv_oe,
#endif
};
static void gpio_set_alarm(struct gpio_private *priv)
{
int bit;
int intr_cfg;
int mask;
int pins;
unsigned long flags;
spin_lock_irqsave(&gpio_lock, flags);
intr_cfg = REG_RD_INT(gio, regi_gio, rw_intr_cfg);
pins = REG_RD_INT(gio, regi_gio, rw_intr_pins);
mask = REG_RD_INT(gio, regi_gio, rw_intr_mask) & I2C_INTERRUPT_BITS;
for (bit = 0; bit < 32; bit++) {
int intr = bit % 8;
int pin = bit / 8;
if (priv->minor < GPIO_MINOR_LEDS)
pin += priv->minor * 4;
else
pin += (priv->minor - 1) * 4;
if (priv->highalarm & (1<<bit)) {
intr_cfg |= (regk_gio_hi << (intr * 3));
mask |= 1 << intr;
wanted_interrupts = mask & 0xff;
pins |= pin << (intr * 4);
} else if (priv->lowalarm & (1<<bit)) {
intr_cfg |= (regk_gio_lo << (intr * 3));
mask |= 1 << intr;
wanted_interrupts = mask & 0xff;
pins |= pin << (intr * 4);
}
}
REG_WR_INT(gio, regi_gio, rw_intr_cfg, intr_cfg);
REG_WR_INT(gio, regi_gio, rw_intr_pins, pins);
REG_WR_INT(gio, regi_gio, rw_intr_mask, mask);
spin_unlock_irqrestore(&gpio_lock, flags);
}
static unsigned int gpio_poll(struct file *file, struct poll_table_struct *wait)
{
unsigned int mask = 0;
struct gpio_private *priv = file->private_data;
unsigned long data;
unsigned long tmp;
if (priv->minor >= GPIO_MINOR_PWM0 &&
priv->minor <= GPIO_MINOR_LAST_PWM)
return 0;
poll_wait(file, &priv->alarm_wq, wait);
if (priv->minor <= GPIO_MINOR_D) {
data = readl(data_in[priv->minor]);
REG_WR_INT(gio, regi_gio, rw_ack_intr, wanted_interrupts);
tmp = REG_RD_INT(gio, regi_gio, rw_intr_mask);
tmp &= I2C_INTERRUPT_BITS;
tmp |= wanted_interrupts;
REG_WR_INT(gio, regi_gio, rw_intr_mask, tmp);
} else
return 0;
if ((data & priv->highalarm) || (~data & priv->lowalarm))
mask = POLLIN|POLLRDNORM;
DP(printk(KERN_DEBUG "gpio_poll ready: mask 0x%08X\n", mask));
return mask;
}
static irqreturn_t gpio_interrupt(int irq, void *dev_id)
{
reg_gio_rw_intr_mask intr_mask;
reg_gio_r_masked_intr masked_intr;
reg_gio_rw_ack_intr ack_intr;
unsigned long flags;
unsigned long tmp;
unsigned long tmp2;
#ifdef CONFIG_ETRAX_VIRTUAL_GPIO
unsigned char enable_gpiov_ack = 0;
#endif
/* Find what PA interrupts are active */
masked_intr = REG_RD(gio, regi_gio, r_masked_intr);
tmp = REG_TYPE_CONV(unsigned long, reg_gio_r_masked_intr, masked_intr);
/* Find those that we have enabled */
spin_lock_irqsave(&gpio_lock, flags);
tmp &= wanted_interrupts;
spin_unlock_irqrestore(&gpio_lock, flags);
#ifdef CONFIG_ETRAX_VIRTUAL_GPIO
/* Something changed on virtual GPIO. Interrupt is acked by
* reading the device.
*/
if (tmp & (1 << CONFIG_ETRAX_VIRTUAL_GPIO_INTERRUPT_PA_PIN)) {
i2c_read(VIRT_I2C_ADDR, (void *)&cached_virtual_gpio_read,
sizeof(cached_virtual_gpio_read));
enable_gpiov_ack = 1;
}
#endif
/* Ack them */
ack_intr = REG_TYPE_CONV(reg_gio_rw_ack_intr, unsigned long, tmp);
REG_WR(gio, regi_gio, rw_ack_intr, ack_intr);
/* Disable those interrupts.. */
intr_mask = REG_RD(gio, regi_gio, rw_intr_mask);
tmp2 = REG_TYPE_CONV(unsigned long, reg_gio_rw_intr_mask, intr_mask);
tmp2 &= ~tmp;
#ifdef CONFIG_ETRAX_VIRTUAL_GPIO
/* Do not disable interrupt on virtual GPIO. Changes on virtual
* pins are only noticed by an interrupt.
*/
if (enable_gpiov_ack)
tmp2 |= (1 << CONFIG_ETRAX_VIRTUAL_GPIO_INTERRUPT_PA_PIN);
#endif
intr_mask = REG_TYPE_CONV(reg_gio_rw_intr_mask, unsigned long, tmp2);
REG_WR(gio, regi_gio, rw_intr_mask, intr_mask);
return IRQ_RETVAL(tmp);
}
static void gpio_write_bit(unsigned long *port, unsigned char data, int bit,
unsigned char clk_mask, unsigned char data_mask)
{
unsigned long shadow = readl(port) & ~clk_mask;
writel(shadow, port);
if (data & 1 << bit)
shadow |= data_mask;
else
shadow &= ~data_mask;
writel(shadow, port);
/* For FPGA: min 5.0ns (DCC) before CCLK high */
shadow |= clk_mask;
writel(shadow, port);
}
static void gpio_write_byte(struct gpio_private *priv, unsigned long *port,
unsigned char data)
{
int i;
if (priv->write_msb)
for (i = 7; i >= 0; i--)
gpio_write_bit(port, data, i, priv->clk_mask,
priv->data_mask);
else
for (i = 0; i <= 7; i++)
gpio_write_bit(port, data, i, priv->clk_mask,
priv->data_mask);
}
static ssize_t gpio_write(struct file *file, const char __user *buf,
size_t count, loff_t *off)
{
struct gpio_private *priv = file->private_data;
unsigned long flags;
ssize_t retval = count;
/* Only bits 0-7 may be used for write operations but allow all
devices except leds... */
#ifdef CONFIG_ETRAX_VIRTUAL_GPIO
if (priv->minor == GPIO_MINOR_V)
return -EFAULT;
#endif
if (priv->minor == GPIO_MINOR_LEDS)
return -EFAULT;
if (priv->minor >= GPIO_MINOR_PWM0 &&
priv->minor <= GPIO_MINOR_LAST_PWM)
return -EFAULT;
if (!access_ok(VERIFY_READ, buf, count))
return -EFAULT;
/* It must have been configured using the IO_CFG_WRITE_MODE */
/* Perhaps a better error code? */
if (priv->clk_mask == 0 || priv->data_mask == 0)
return -EPERM;
D(printk(KERN_DEBUG "gpio_write: %lu to data 0x%02X clk 0x%02X "
"msb: %i\n",
count, priv->data_mask, priv->clk_mask, priv->write_msb));
spin_lock_irqsave(&gpio_lock, flags);
while (count--)
gpio_write_byte(priv, data_out[priv->minor], *buf++);
spin_unlock_irqrestore(&gpio_lock, flags);
return retval;
}
static int gpio_open(struct inode *inode, struct file *filp)
{
struct gpio_private *priv;
int p = iminor(inode);
if (p > GPIO_MINOR_LAST_PWM ||
(p > GPIO_MINOR_LAST && p < GPIO_MINOR_PWM0))
return -EINVAL;
priv = kmalloc(sizeof(struct gpio_private), GFP_KERNEL);
if (!priv)
return -ENOMEM;
mutex_lock(&gpio_mutex);
memset(priv, 0, sizeof(*priv));
priv->minor = p;
filp->private_data = priv;
/* initialize the io/alarm struct, not for PWM ports though */
if (p <= GPIO_MINOR_LAST) {
priv->clk_mask = 0;
priv->data_mask = 0;
priv->highalarm = 0;
priv->lowalarm = 0;
init_waitqueue_head(&priv->alarm_wq);
/* link it into our alarmlist */
spin_lock_irq(&gpio_lock);
priv->next = alarmlist;
alarmlist = priv;
spin_unlock_irq(&gpio_lock);
}
mutex_unlock(&gpio_mutex);
return 0;
}
static int gpio_release(struct inode *inode, struct file *filp)
{
struct gpio_private *p;
struct gpio_private *todel;
/* local copies while updating them: */
unsigned long a_high, a_low;
/* prepare to free private structure */
todel = filp->private_data;
/* unlink from alarmlist - only for non-PWM ports though */
if (todel->minor <= GPIO_MINOR_LAST) {
spin_lock_irq(&gpio_lock);
p = alarmlist;
if (p == todel)
alarmlist = todel->next;
else {
while (p->next != todel)
p = p->next;
p->next = todel->next;
}
/* Check if there are still any alarms set */
p = alarmlist;
a_high = 0;
a_low = 0;
while (p) {
if (p->minor == GPIO_MINOR_A) {
#ifdef CONFIG_ETRAX_VIRTUAL_GPIO
p->lowalarm |= (1 << CONFIG_ETRAX_VIRTUAL_GPIO_INTERRUPT_PA_PIN);
#endif
a_high |= p->highalarm;
a_low |= p->lowalarm;
}
p = p->next;
}
#ifdef CONFIG_ETRAX_VIRTUAL_GPIO
/* Variable 'a_low' needs to be set here again
* to ensure that interrupt for virtual GPIO is handled.
*/
a_low |= (1 << CONFIG_ETRAX_VIRTUAL_GPIO_INTERRUPT_PA_PIN);
#endif
spin_unlock_irq(&gpio_lock);
}
kfree(todel);
return 0;
}
/* Main device API. ioctl's to read/set/clear bits, as well as to
* set alarms to wait for using a subsequent select().
*/
inline unsigned long setget_input(struct gpio_private *priv, unsigned long arg)
{
/* Set direction 0=unchanged 1=input,
* return mask with 1=input
*/
unsigned long flags;
unsigned long dir_shadow;
spin_lock_irqsave(&gpio_lock, flags);
dir_shadow = readl(dir_oe[priv->minor]) &
~(arg & changeable_dir[priv->minor]);
writel(dir_shadow, dir_oe[priv->minor]);
spin_unlock_irqrestore(&gpio_lock, flags);
if (priv->minor == GPIO_MINOR_C)
dir_shadow ^= 0xFFFF; /* Only 16 bits */
#ifdef CONFIG_ETRAX_VIRTUAL_GPIO
else if (priv->minor == GPIO_MINOR_V)
dir_shadow ^= 0xFFFF; /* Only 16 bits */
#endif
else
dir_shadow ^= 0xFFFFFFFF; /* PA, PB and PD 32 bits */
return dir_shadow;
} /* setget_input */
static inline unsigned long setget_output(struct gpio_private *priv,
unsigned long arg)
{
unsigned long flags;
unsigned long dir_shadow;
spin_lock_irqsave(&gpio_lock, flags);
dir_shadow = readl(dir_oe[priv->minor]) |
(arg & changeable_dir[priv->minor]);
writel(dir_shadow, dir_oe[priv->minor]);
spin_unlock_irqrestore(&gpio_lock, flags);
return dir_shadow;
} /* setget_output */
static long gpio_ioctl_unlocked(struct file *file,
unsigned int cmd, unsigned long arg)
{
unsigned long flags;
unsigned long val;
unsigned long shadow;
struct gpio_private *priv = file->private_data;
if (_IOC_TYPE(cmd) != ETRAXGPIO_IOCTYPE)
return -ENOTTY;
/* Check for special ioctl handlers first */
#ifdef CONFIG_ETRAX_VIRTUAL_GPIO
if (priv->minor == GPIO_MINOR_V)
return virtual_gpio_ioctl(file, cmd, arg);
#endif
if (priv->minor == GPIO_MINOR_LEDS)
return gpio_leds_ioctl(cmd, arg);
if (priv->minor >= GPIO_MINOR_PWM0 &&
priv->minor <= GPIO_MINOR_LAST_PWM)
return gpio_pwm_ioctl(priv, cmd, arg);
switch (_IOC_NR(cmd)) {
case IO_READBITS: /* Use IO_READ_INBITS and IO_READ_OUTBITS instead */
/* Read the port. */
return readl(data_in[priv->minor]);
case IO_SETBITS:
spin_lock_irqsave(&gpio_lock, flags);
/* Set changeable bits with a 1 in arg. */
shadow = readl(data_out[priv->minor]) |
(arg & changeable_bits[priv->minor]);
writel(shadow, data_out[priv->minor]);
spin_unlock_irqrestore(&gpio_lock, flags);
break;
case IO_CLRBITS:
spin_lock_irqsave(&gpio_lock, flags);
/* Clear changeable bits with a 1 in arg. */
shadow = readl(data_out[priv->minor]) &
~(arg & changeable_bits[priv->minor]);
writel(shadow, data_out[priv->minor]);
spin_unlock_irqrestore(&gpio_lock, flags);
break;
case IO_HIGHALARM:
/* Set alarm when bits with 1 in arg go high. */
priv->highalarm |= arg;
gpio_set_alarm(priv);
break;
case IO_LOWALARM:
/* Set alarm when bits with 1 in arg go low. */
priv->lowalarm |= arg;
gpio_set_alarm(priv);
break;
case IO_CLRALARM:
/* Clear alarm for bits with 1 in arg. */
priv->highalarm &= ~arg;
priv->lowalarm &= ~arg;
gpio_set_alarm(priv);
break;
case IO_READDIR: /* Use IO_SETGET_INPUT/OUTPUT instead! */
/* Read direction 0=input 1=output */
return readl(dir_oe[priv->minor]);
case IO_SETINPUT: /* Use IO_SETGET_INPUT instead! */
/* Set direction 0=unchanged 1=input,
* return mask with 1=input
*/
return setget_input(priv, arg);
case IO_SETOUTPUT: /* Use IO_SETGET_OUTPUT instead! */
/* Set direction 0=unchanged 1=output,
* return mask with 1=output
*/
return setget_output(priv, arg);
case IO_CFG_WRITE_MODE:
{
int res = -EPERM;
unsigned long dir_shadow, clk_mask, data_mask, write_msb;
clk_mask = arg & 0xFF;
data_mask = (arg >> 8) & 0xFF;
write_msb = (arg >> 16) & 0x01;
/* Check if we're allowed to change the bits and
* the direction is correct
*/
spin_lock_irqsave(&gpio_lock, flags);
dir_shadow = readl(dir_oe[priv->minor]);
if ((clk_mask & changeable_bits[priv->minor]) &&
(data_mask & changeable_bits[priv->minor]) &&
(clk_mask & dir_shadow) &&
(data_mask & dir_shadow)) {
priv->clk_mask = clk_mask;
priv->data_mask = data_mask;
priv->write_msb = write_msb;
res = 0;
}
spin_unlock_irqrestore(&gpio_lock, flags);
return res;
}
case IO_READ_INBITS:
/* *arg is result of reading the input pins */
val = readl(data_in[priv->minor]);
if (copy_to_user((void __user *)arg, &val, sizeof(val)))
return -EFAULT;
return 0;
case IO_READ_OUTBITS:
/* *arg is result of reading the output shadow */
val = *data_out[priv->minor];
if (copy_to_user((void __user *)arg, &val, sizeof(val)))
return -EFAULT;
break;
case IO_SETGET_INPUT:
/* bits set in *arg is set to input,
* *arg updated with current input pins.
*/
if (copy_from_user(&val, (void __user *)arg, sizeof(val)))
return -EFAULT;
val = setget_input(priv, val);
if (copy_to_user((void __user *)arg, &val, sizeof(val)))
return -EFAULT;
break;
case IO_SETGET_OUTPUT:
/* bits set in *arg is set to output,
* *arg updated with current output pins.
*/
if (copy_from_user(&val, (void __user *)arg, sizeof(val)))
return -EFAULT;
val = setget_output(priv, val);
if (copy_to_user((void __user *)arg, &val, sizeof(val)))
return -EFAULT;
break;
default:
return -EINVAL;
} /* switch */
return 0;
}
static long gpio_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
{
long ret;
mutex_lock(&gpio_mutex);
ret = gpio_ioctl_unlocked(file, cmd, arg);
mutex_unlock(&gpio_mutex);
return ret;
}
#ifdef CONFIG_ETRAX_VIRTUAL_GPIO
static int virtual_gpio_ioctl(struct file *file, unsigned int cmd,
unsigned long arg)
{
unsigned long flags;
unsigned short val;
unsigned short shadow;
struct gpio_private *priv = file->private_data;
switch (_IOC_NR(cmd)) {
case IO_SETBITS:
spin_lock_irqsave(&gpio_lock, flags);
/* Set changeable bits with a 1 in arg. */
i2c_read(VIRT_I2C_ADDR, (void *)&shadow, sizeof(shadow));
shadow |= ~readl(dir_oe[priv->minor]) |
(arg & changeable_bits[priv->minor]);
i2c_write(VIRT_I2C_ADDR, (void *)&shadow, sizeof(shadow));
spin_unlock_irqrestore(&gpio_lock, flags);
break;
case IO_CLRBITS:
spin_lock_irqsave(&gpio_lock, flags);
/* Clear changeable bits with a 1 in arg. */
i2c_read(VIRT_I2C_ADDR, (void *)&shadow, sizeof(shadow));
shadow |= ~readl(dir_oe[priv->minor]) &
~(arg & changeable_bits[priv->minor]);
i2c_write(VIRT_I2C_ADDR, (void *)&shadow, sizeof(shadow));
spin_unlock_irqrestore(&gpio_lock, flags);
break;
case IO_HIGHALARM:
/* Set alarm when bits with 1 in arg go high. */
priv->highalarm |= arg;
break;
case IO_LOWALARM:
/* Set alarm when bits with 1 in arg go low. */
priv->lowalarm |= arg;
break;
case IO_CLRALARM:
/* Clear alarm for bits with 1 in arg. */
priv->highalarm &= ~arg;
priv->lowalarm &= ~arg;
break;
case IO_CFG_WRITE_MODE:
{
unsigned long dir_shadow;
dir_shadow = readl(dir_oe[priv->minor]);
priv->clk_mask = arg & 0xFF;
priv->data_mask = (arg >> 8) & 0xFF;
priv->write_msb = (arg >> 16) & 0x01;
/* Check if we're allowed to change the bits and
* the direction is correct
*/
if (!((priv->clk_mask & changeable_bits[priv->minor]) &&
(priv->data_mask & changeable_bits[priv->minor]) &&
(priv->clk_mask & dir_shadow) &&
(priv->data_mask & dir_shadow))) {
priv->clk_mask = 0;
priv->data_mask = 0;
return -EPERM;
}
break;
}
case IO_READ_INBITS:
/* *arg is result of reading the input pins */
val = cached_virtual_gpio_read & ~readl(dir_oe[priv->minor]);
if (copy_to_user((void __user *)arg, &val, sizeof(val)))
return -EFAULT;
return 0;
case IO_READ_OUTBITS:
/* *arg is result of reading the output shadow */
i2c_read(VIRT_I2C_ADDR, (void *)&val, sizeof(val));
val &= readl(dir_oe[priv->minor]);
if (copy_to_user((void __user *)arg, &val, sizeof(val)))
return -EFAULT;
break;
case IO_SETGET_INPUT:
{
/* bits set in *arg is set to input,
* *arg updated with current input pins.
*/
unsigned short input_mask = ~readl(dir_oe[priv->minor]);
if (copy_from_user(&val, (void __user *)arg, sizeof(val)))
return -EFAULT;
val = setget_input(priv, val);
if (copy_to_user((void __user *)arg, &val, sizeof(val)))
return -EFAULT;
if ((input_mask & val) != input_mask) {
/* Input pins changed. All ports desired as input
* should be set to logic 1.
*/
unsigned short change = input_mask ^ val;
i2c_read(VIRT_I2C_ADDR, (void *)&shadow,
sizeof(shadow));
shadow &= ~change;
shadow |= val;
i2c_write(VIRT_I2C_ADDR, (void *)&shadow,
sizeof(shadow));
}
break;
}
case IO_SETGET_OUTPUT:
/* bits set in *arg is set to output,
* *arg updated with current output pins.
*/
if (copy_from_user(&val, (void __user *)arg, sizeof(val)))
return -EFAULT;
val = setget_output(priv, val);
if (copy_to_user((void __user *)arg, &val, sizeof(val)))
return -EFAULT;
break;
default:
return -EINVAL;
} /* switch */
return 0;
}
#endif /* CONFIG_ETRAX_VIRTUAL_GPIO */
static int gpio_leds_ioctl(unsigned int cmd, unsigned long arg)
{
unsigned char green;
unsigned char red;
switch (_IOC_NR(cmd)) {
case IO_LEDACTIVE_SET:
green = ((unsigned char) arg) & 1;
red = (((unsigned char) arg) >> 1) & 1;
CRIS_LED_ACTIVE_SET_G(green);
CRIS_LED_ACTIVE_SET_R(red);
break;
default:
return -EINVAL;
} /* switch */
return 0;
}
static int gpio_pwm_set_mode(unsigned long arg, int pwm_port)
{
int pinmux_pwm = pinmux_pwm0 + pwm_port;
int mode;
reg_gio_rw_pwm0_ctrl rw_pwm_ctrl = {
.ccd_val = 0,
.ccd_override = regk_gio_no,
.mode = regk_gio_no
};
int allocstatus;
if (get_user(mode, &((struct io_pwm_set_mode *) arg)->mode))
return -EFAULT;
rw_pwm_ctrl.mode = mode;
if (mode != PWM_OFF)
allocstatus = crisv32_pinmux_alloc_fixed(pinmux_pwm);
else
allocstatus = crisv32_pinmux_dealloc_fixed(pinmux_pwm);
if (allocstatus)
return allocstatus;
REG_WRITE(reg_gio_rw_pwm0_ctrl, REG_ADDR(gio, regi_gio, rw_pwm0_ctrl) +
12 * pwm_port, rw_pwm_ctrl);
return 0;
}
static int gpio_pwm_set_period(unsigned long arg, int pwm_port)
{
struct io_pwm_set_period periods;
reg_gio_rw_pwm0_var rw_pwm_widths;
if (copy_from_user(&periods, (void __user *)arg, sizeof(periods)))
return -EFAULT;
if (periods.lo > 8191 || periods.hi > 8191)
return -EINVAL;
rw_pwm_widths.lo = periods.lo;
rw_pwm_widths.hi = periods.hi;
REG_WRITE(reg_gio_rw_pwm0_var, REG_ADDR(gio, regi_gio, rw_pwm0_var) +
12 * pwm_port, rw_pwm_widths);
return 0;
}
static int gpio_pwm_set_duty(unsigned long arg, int pwm_port)
{
unsigned int duty;
reg_gio_rw_pwm0_data rw_pwm_duty;
if (get_user(duty, &((struct io_pwm_set_duty *) arg)->duty))
return -EFAULT;
if (duty > 255)
return -EINVAL;
rw_pwm_duty.data = duty;
REG_WRITE(reg_gio_rw_pwm0_data, REG_ADDR(gio, regi_gio, rw_pwm0_data) +
12 * pwm_port, rw_pwm_duty);
return 0;
}
static int gpio_pwm_ioctl(struct gpio_private *priv, unsigned int cmd,
unsigned long arg)
{
int pwm_port = priv->minor - GPIO_MINOR_PWM0;
switch (_IOC_NR(cmd)) {
case IO_PWM_SET_MODE:
return gpio_pwm_set_mode(arg, pwm_port);
case IO_PWM_SET_PERIOD:
return gpio_pwm_set_period(arg, pwm_port);
case IO_PWM_SET_DUTY:
return gpio_pwm_set_duty(arg, pwm_port);
default:
return -EINVAL;
}
return 0;
}
static const struct file_operations gpio_fops = {
.owner = THIS_MODULE,
.poll = gpio_poll,
.unlocked_ioctl = gpio_ioctl,
.write = gpio_write,
.open = gpio_open,
.release = gpio_release,
.llseek = noop_llseek,
};
#ifdef CONFIG_ETRAX_VIRTUAL_GPIO
static void __init virtual_gpio_init(void)
{
reg_gio_rw_intr_cfg intr_cfg;
reg_gio_rw_intr_mask intr_mask;
unsigned short shadow;
shadow = ~virtual_rw_pv_oe; /* Input ports should be set to logic 1 */
shadow |= CONFIG_ETRAX_DEF_GIO_PV_OUT;
i2c_write(VIRT_I2C_ADDR, (void *)&shadow, sizeof(shadow));
/* Set interrupt mask and on what state the interrupt shall trigger.
* For virtual gpio the interrupt shall trigger on logic '0'.
*/
intr_cfg = REG_RD(gio, regi_gio, rw_intr_cfg);
intr_mask = REG_RD(gio, regi_gio, rw_intr_mask);
switch (CONFIG_ETRAX_VIRTUAL_GPIO_INTERRUPT_PA_PIN) {
case 0:
intr_cfg.pa0 = regk_gio_lo;
intr_mask.pa0 = regk_gio_yes;
break;
case 1:
intr_cfg.pa1 = regk_gio_lo;
intr_mask.pa1 = regk_gio_yes;
break;
case 2:
intr_cfg.pa2 = regk_gio_lo;
intr_mask.pa2 = regk_gio_yes;
break;
case 3:
intr_cfg.pa3 = regk_gio_lo;
intr_mask.pa3 = regk_gio_yes;
break;
case 4:
intr_cfg.pa4 = regk_gio_lo;
intr_mask.pa4 = regk_gio_yes;
break;
case 5:
intr_cfg.pa5 = regk_gio_lo;
intr_mask.pa5 = regk_gio_yes;
break;
case 6:
intr_cfg.pa6 = regk_gio_lo;
intr_mask.pa6 = regk_gio_yes;
break;
case 7:
intr_cfg.pa7 = regk_gio_lo;
intr_mask.pa7 = regk_gio_yes;
break;
}
REG_WR(gio, regi_gio, rw_intr_cfg, intr_cfg);
REG_WR(gio, regi_gio, rw_intr_mask, intr_mask);
}
#endif
/* main driver initialization routine, called from mem.c */
static int __init gpio_init(void)
{
int res;
printk(KERN_INFO "ETRAX FS GPIO driver v2.7, (c) 2003-2008 "
"Axis Communications AB\n");
/* do the formalities */
res = register_chrdev(GPIO_MAJOR, gpio_name, &gpio_fops);
if (res < 0) {
printk(KERN_ERR "gpio: couldn't get a major number.\n");
return res;
}
/* Clear all leds */
CRIS_LED_NETWORK_GRP0_SET(0);
CRIS_LED_NETWORK_GRP1_SET(0);
CRIS_LED_ACTIVE_SET(0);
CRIS_LED_DISK_READ(0);
CRIS_LED_DISK_WRITE(0);
int res2 = request_irq(GIO_INTR_VECT, gpio_interrupt,
IRQF_SHARED, "gpio", &alarmlist);
if (res2) {
printk(KERN_ERR "err: irq for gpio\n");
return res2;
}
/* No IRQs by default. */
REG_WR_INT(gio, regi_gio, rw_intr_pins, 0);
#ifdef CONFIG_ETRAX_VIRTUAL_GPIO
virtual_gpio_init();
#endif
return res;
}
/* this makes sure that gpio_init is called during kernel boot */
module_init(gpio_init);