767 lines
19 KiB
C
767 lines
19 KiB
C
|
/* $Id: gpio.c,v 1.16 2005/06/19 17:06:49 starvik Exp $
|
||
|
*
|
||
|
* ETRAX CRISv32 general port I/O device
|
||
|
*
|
||
|
* Copyright (c) 1999, 2000, 2001, 2002, 2003 Axis Communications AB
|
||
|
*
|
||
|
* Authors: Bjorn Wesen (initial version)
|
||
|
* Ola Knutsson (LED handling)
|
||
|
* Johan Adolfsson (read/set directions, write, port G,
|
||
|
* port to ETRAX FS.
|
||
|
*
|
||
|
* $Log: gpio.c,v $
|
||
|
* Revision 1.16 2005/06/19 17:06:49 starvik
|
||
|
* Merge of Linux 2.6.12.
|
||
|
*
|
||
|
* Revision 1.15 2005/05/25 08:22:20 starvik
|
||
|
* Changed GPIO port order to fit packages/devices/axis-2.4.
|
||
|
*
|
||
|
* Revision 1.14 2005/04/24 18:35:08 starvik
|
||
|
* Updated with final register headers.
|
||
|
*
|
||
|
* Revision 1.13 2005/03/15 15:43:00 starvik
|
||
|
* dev_id needs to be supplied for shared IRQs.
|
||
|
*
|
||
|
* Revision 1.12 2005/03/10 17:12:00 starvik
|
||
|
* Protect alarm list with spinlock.
|
||
|
*
|
||
|
* Revision 1.11 2005/01/05 06:08:59 starvik
|
||
|
* No need to do local_irq_disable after local_irq_save.
|
||
|
*
|
||
|
* Revision 1.10 2004/11/19 08:38:31 starvik
|
||
|
* Removed old crap.
|
||
|
*
|
||
|
* Revision 1.9 2004/05/14 07:58:02 starvik
|
||
|
* Merge of changes from 2.4
|
||
|
*
|
||
|
* Revision 1.8 2003/09/11 07:29:50 starvik
|
||
|
* Merge of Linux 2.6.0-test5
|
||
|
*
|
||
|
* Revision 1.7 2003/07/10 13:25:46 starvik
|
||
|
* Compiles for 2.5.74
|
||
|
* Lindented ethernet.c
|
||
|
*
|
||
|
* Revision 1.6 2003/07/04 08:27:46 starvik
|
||
|
* Merge of Linux 2.5.74
|
||
|
*
|
||
|
* Revision 1.5 2003/06/10 08:26:37 johana
|
||
|
* Etrax -> ETRAX CRISv32
|
||
|
*
|
||
|
* Revision 1.4 2003/06/05 14:22:48 johana
|
||
|
* Initialise some_alarms.
|
||
|
*
|
||
|
* Revision 1.3 2003/06/05 10:15:46 johana
|
||
|
* New INTR_VECT macros.
|
||
|
* Enable interrupts in global config.
|
||
|
*
|
||
|
* Revision 1.2 2003/06/03 15:52:50 johana
|
||
|
* Initial CRIS v32 version.
|
||
|
*
|
||
|
* Revision 1.1 2003/06/03 08:53:15 johana
|
||
|
* Copy of os/lx25/arch/cris/arch-v10/drivers/gpio.c version 1.7.
|
||
|
*
|
||
|
*/
|
||
|
|
||
|
#include <linux/config.h>
|
||
|
|
||
|
#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 <asm/etraxgpio.h>
|
||
|
#include <asm/arch/hwregs/reg_map.h>
|
||
|
#include <asm/arch/hwregs/reg_rdwr.h>
|
||
|
#include <asm/arch/hwregs/gio_defs.h>
|
||
|
#include <asm/arch/hwregs/intr_vect_defs.h>
|
||
|
#include <asm/io.h>
|
||
|
#include <asm/system.h>
|
||
|
#include <asm/irq.h>
|
||
|
|
||
|
/* The following gio ports on ETRAX FS is available:
|
||
|
* pa 8 bits, supports interrupts off, hi, low, set, posedge, negedge anyedge
|
||
|
* pb 18 bits
|
||
|
* pc 18 bits
|
||
|
* pd 18 bits
|
||
|
* pe 18 bits
|
||
|
* each port has a rw_px_dout, r_px_din and rw_px_oe register.
|
||
|
*/
|
||
|
|
||
|
#define GPIO_MAJOR 120 /* experimental MAJOR number */
|
||
|
|
||
|
#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 char gpio_name[] = "etrax gpio";
|
||
|
|
||
|
#if 0
|
||
|
static wait_queue_head_t *gpio_wq;
|
||
|
#endif
|
||
|
|
||
|
static int gpio_ioctl(struct inode *inode, struct file *file,
|
||
|
unsigned int cmd, unsigned long arg);
|
||
|
static ssize_t gpio_write(struct file * file, const char * 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;
|
||
|
};
|
||
|
|
||
|
/* linked list of alarms to check for */
|
||
|
|
||
|
static struct gpio_private *alarmlist = 0;
|
||
|
|
||
|
static int gpio_some_alarms = 0; /* Set if someone uses alarm */
|
||
|
static unsigned long gpio_pa_high_alarms = 0;
|
||
|
static unsigned long gpio_pa_low_alarms = 0;
|
||
|
|
||
|
static DEFINE_SPINLOCK(alarm_lock);
|
||
|
|
||
|
#define NUM_PORTS (GPIO_MINOR_LAST+1)
|
||
|
#define GIO_REG_RD_ADDR(reg) (volatile unsigned long*) (regi_gio + REG_RD_ADDR_gio_##reg )
|
||
|
#define GIO_REG_WR_ADDR(reg) (volatile unsigned long*) (regi_gio + REG_RD_ADDR_gio_##reg )
|
||
|
unsigned long led_dummy;
|
||
|
|
||
|
static volatile 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),
|
||
|
GIO_REG_WR_ADDR(rw_pd_dout),
|
||
|
GIO_REG_WR_ADDR(rw_pe_dout),
|
||
|
};
|
||
|
|
||
|
static volatile 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),
|
||
|
GIO_REG_RD_ADDR(r_pe_din),
|
||
|
};
|
||
|
|
||
|
static unsigned long changeable_dir[NUM_PORTS] = {
|
||
|
CONFIG_ETRAX_PA_CHANGEABLE_DIR,
|
||
|
CONFIG_ETRAX_PB_CHANGEABLE_DIR,
|
||
|
0,
|
||
|
CONFIG_ETRAX_PC_CHANGEABLE_DIR,
|
||
|
CONFIG_ETRAX_PD_CHANGEABLE_DIR,
|
||
|
CONFIG_ETRAX_PE_CHANGEABLE_DIR,
|
||
|
};
|
||
|
|
||
|
static unsigned long changeable_bits[NUM_PORTS] = {
|
||
|
CONFIG_ETRAX_PA_CHANGEABLE_BITS,
|
||
|
CONFIG_ETRAX_PB_CHANGEABLE_BITS,
|
||
|
0,
|
||
|
CONFIG_ETRAX_PC_CHANGEABLE_BITS,
|
||
|
CONFIG_ETRAX_PD_CHANGEABLE_BITS,
|
||
|
CONFIG_ETRAX_PE_CHANGEABLE_BITS,
|
||
|
};
|
||
|
|
||
|
static volatile 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),
|
||
|
GIO_REG_WR_ADDR(rw_pd_oe),
|
||
|
GIO_REG_WR_ADDR(rw_pe_oe),
|
||
|
};
|
||
|
|
||
|
|
||
|
|
||
|
static unsigned int
|
||
|
gpio_poll(struct file *file,
|
||
|
poll_table *wait)
|
||
|
{
|
||
|
unsigned int mask = 0;
|
||
|
struct gpio_private *priv = (struct gpio_private *)file->private_data;
|
||
|
unsigned long data;
|
||
|
poll_wait(file, &priv->alarm_wq, wait);
|
||
|
if (priv->minor == GPIO_MINOR_A) {
|
||
|
reg_gio_rw_intr_cfg intr_cfg;
|
||
|
unsigned long tmp;
|
||
|
unsigned long flags;
|
||
|
|
||
|
local_irq_save(flags);
|
||
|
data = REG_TYPE_CONV(unsigned long, reg_gio_r_pa_din, REG_RD(gio, regi_gio, r_pa_din));
|
||
|
/* PA has support for interrupt
|
||
|
* lets activate high for those low and with highalarm set
|
||
|
*/
|
||
|
intr_cfg = REG_RD(gio, regi_gio, rw_intr_cfg);
|
||
|
|
||
|
tmp = ~data & priv->highalarm & 0xFF;
|
||
|
if (tmp & (1 << 0)) {
|
||
|
intr_cfg.pa0 = regk_gio_hi;
|
||
|
}
|
||
|
if (tmp & (1 << 1)) {
|
||
|
intr_cfg.pa1 = regk_gio_hi;
|
||
|
}
|
||
|
if (tmp & (1 << 2)) {
|
||
|
intr_cfg.pa2 = regk_gio_hi;
|
||
|
}
|
||
|
if (tmp & (1 << 3)) {
|
||
|
intr_cfg.pa3 = regk_gio_hi;
|
||
|
}
|
||
|
if (tmp & (1 << 4)) {
|
||
|
intr_cfg.pa4 = regk_gio_hi;
|
||
|
}
|
||
|
if (tmp & (1 << 5)) {
|
||
|
intr_cfg.pa5 = regk_gio_hi;
|
||
|
}
|
||
|
if (tmp & (1 << 6)) {
|
||
|
intr_cfg.pa6 = regk_gio_hi;
|
||
|
}
|
||
|
if (tmp & (1 << 7)) {
|
||
|
intr_cfg.pa7 = regk_gio_hi;
|
||
|
}
|
||
|
/*
|
||
|
* lets activate low for those high and with lowalarm set
|
||
|
*/
|
||
|
tmp = data & priv->lowalarm & 0xFF;
|
||
|
if (tmp & (1 << 0)) {
|
||
|
intr_cfg.pa0 = regk_gio_lo;
|
||
|
}
|
||
|
if (tmp & (1 << 1)) {
|
||
|
intr_cfg.pa1 = regk_gio_lo;
|
||
|
}
|
||
|
if (tmp & (1 << 2)) {
|
||
|
intr_cfg.pa2 = regk_gio_lo;
|
||
|
}
|
||
|
if (tmp & (1 << 3)) {
|
||
|
intr_cfg.pa3 = regk_gio_lo;
|
||
|
}
|
||
|
if (tmp & (1 << 4)) {
|
||
|
intr_cfg.pa4 = regk_gio_lo;
|
||
|
}
|
||
|
if (tmp & (1 << 5)) {
|
||
|
intr_cfg.pa5 = regk_gio_lo;
|
||
|
}
|
||
|
if (tmp & (1 << 6)) {
|
||
|
intr_cfg.pa6 = regk_gio_lo;
|
||
|
}
|
||
|
if (tmp & (1 << 7)) {
|
||
|
intr_cfg.pa7 = regk_gio_lo;
|
||
|
}
|
||
|
|
||
|
REG_WR(gio, regi_gio, rw_intr_cfg, intr_cfg);
|
||
|
local_irq_restore(flags);
|
||
|
} else if (priv->minor <= GPIO_MINOR_E)
|
||
|
data = *data_in[priv->minor];
|
||
|
else
|
||
|
return 0;
|
||
|
|
||
|
if ((data & priv->highalarm) ||
|
||
|
(~data & priv->lowalarm)) {
|
||
|
mask = POLLIN|POLLRDNORM;
|
||
|
}
|
||
|
|
||
|
DP(printk("gpio_poll ready: mask 0x%08X\n", mask));
|
||
|
return mask;
|
||
|
}
|
||
|
|
||
|
int etrax_gpio_wake_up_check(void)
|
||
|
{
|
||
|
struct gpio_private *priv = alarmlist;
|
||
|
unsigned long data = 0;
|
||
|
int ret = 0;
|
||
|
while (priv) {
|
||
|
data = *data_in[priv->minor];
|
||
|
if ((data & priv->highalarm) ||
|
||
|
(~data & priv->lowalarm)) {
|
||
|
DP(printk("etrax_gpio_wake_up_check %i\n",priv->minor));
|
||
|
wake_up_interruptible(&priv->alarm_wq);
|
||
|
ret = 1;
|
||
|
}
|
||
|
priv = priv->next;
|
||
|
}
|
||
|
return ret;
|
||
|
}
|
||
|
|
||
|
static irqreturn_t
|
||
|
gpio_poll_timer_interrupt(int irq, void *dev_id, struct pt_regs *regs)
|
||
|
{
|
||
|
if (gpio_some_alarms) {
|
||
|
return IRQ_RETVAL(etrax_gpio_wake_up_check());
|
||
|
}
|
||
|
return IRQ_NONE;
|
||
|
}
|
||
|
|
||
|
static irqreturn_t
|
||
|
gpio_pa_interrupt(int irq, void *dev_id, struct pt_regs *regs)
|
||
|
{
|
||
|
reg_gio_rw_intr_mask intr_mask;
|
||
|
reg_gio_r_masked_intr masked_intr;
|
||
|
reg_gio_rw_ack_intr ack_intr;
|
||
|
unsigned long tmp;
|
||
|
unsigned long tmp2;
|
||
|
|
||
|
/* 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(&alarm_lock);
|
||
|
tmp &= (gpio_pa_high_alarms | gpio_pa_low_alarms);
|
||
|
spin_unlock(&alarm_lock);
|
||
|
|
||
|
/* 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;
|
||
|
intr_mask = REG_TYPE_CONV(reg_gio_rw_intr_mask, unsigned long, tmp2);
|
||
|
REG_WR(gio, regi_gio, rw_intr_mask, intr_mask);
|
||
|
|
||
|
if (gpio_some_alarms) {
|
||
|
return IRQ_RETVAL(etrax_gpio_wake_up_check());
|
||
|
}
|
||
|
return IRQ_NONE;
|
||
|
}
|
||
|
|
||
|
|
||
|
static ssize_t gpio_write(struct file * file, const char * buf, size_t count,
|
||
|
loff_t *off)
|
||
|
{
|
||
|
struct gpio_private *priv = (struct gpio_private *)file->private_data;
|
||
|
unsigned char data, clk_mask, data_mask, write_msb;
|
||
|
unsigned long flags;
|
||
|
unsigned long shadow;
|
||
|
volatile unsigned long *port;
|
||
|
ssize_t retval = count;
|
||
|
/* Only bits 0-7 may be used for write operations but allow all
|
||
|
devices except leds... */
|
||
|
if (priv->minor == GPIO_MINOR_LEDS) {
|
||
|
return -EFAULT;
|
||
|
}
|
||
|
|
||
|
if (!access_ok(VERIFY_READ, buf, count)) {
|
||
|
return -EFAULT;
|
||
|
}
|
||
|
clk_mask = priv->clk_mask;
|
||
|
data_mask = priv->data_mask;
|
||
|
/* It must have been configured using the IO_CFG_WRITE_MODE */
|
||
|
/* Perhaps a better error code? */
|
||
|
if (clk_mask == 0 || data_mask == 0) {
|
||
|
return -EPERM;
|
||
|
}
|
||
|
write_msb = priv->write_msb;
|
||
|
D(printk("gpio_write: %lu to data 0x%02X clk 0x%02X msb: %i\n",count, data_mask, clk_mask, write_msb));
|
||
|
port = data_out[priv->minor];
|
||
|
|
||
|
while (count--) {
|
||
|
int i;
|
||
|
data = *buf++;
|
||
|
if (priv->write_msb) {
|
||
|
for (i = 7; i >= 0;i--) {
|
||
|
local_irq_save(flags);
|
||
|
shadow = *port;
|
||
|
*port = shadow &= ~clk_mask;
|
||
|
if (data & 1<<i)
|
||
|
*port = shadow |= data_mask;
|
||
|
else
|
||
|
*port = shadow &= ~data_mask;
|
||
|
/* For FPGA: min 5.0ns (DCC) before CCLK high */
|
||
|
*port = shadow |= clk_mask;
|
||
|
local_irq_restore(flags);
|
||
|
}
|
||
|
} else {
|
||
|
for (i = 0; i <= 7;i++) {
|
||
|
local_irq_save(flags);
|
||
|
shadow = *port;
|
||
|
*port = shadow &= ~clk_mask;
|
||
|
if (data & 1<<i)
|
||
|
*port = shadow |= data_mask;
|
||
|
else
|
||
|
*port = shadow &= ~data_mask;
|
||
|
/* For FPGA: min 5.0ns (DCC) before CCLK high */
|
||
|
*port = shadow |= clk_mask;
|
||
|
local_irq_restore(flags);
|
||
|
}
|
||
|
}
|
||
|
}
|
||
|
return retval;
|
||
|
}
|
||
|
|
||
|
|
||
|
|
||
|
static int
|
||
|
gpio_open(struct inode *inode, struct file *filp)
|
||
|
{
|
||
|
struct gpio_private *priv;
|
||
|
int p = MINOR(inode->i_rdev);
|
||
|
|
||
|
if (p > GPIO_MINOR_LAST)
|
||
|
return -EINVAL;
|
||
|
|
||
|
priv = (struct gpio_private *)kmalloc(sizeof(struct gpio_private),
|
||
|
GFP_KERNEL);
|
||
|
|
||
|
if (!priv)
|
||
|
return -ENOMEM;
|
||
|
|
||
|
priv->minor = p;
|
||
|
|
||
|
/* initialize the io/alarm struct and link it into our alarmlist */
|
||
|
|
||
|
priv->next = alarmlist;
|
||
|
alarmlist = priv;
|
||
|
priv->clk_mask = 0;
|
||
|
priv->data_mask = 0;
|
||
|
priv->highalarm = 0;
|
||
|
priv->lowalarm = 0;
|
||
|
init_waitqueue_head(&priv->alarm_wq);
|
||
|
|
||
|
filp->private_data = (void *)priv;
|
||
|
|
||
|
return 0;
|
||
|
}
|
||
|
|
||
|
static int
|
||
|
gpio_release(struct inode *inode, struct file *filp)
|
||
|
{
|
||
|
struct gpio_private *p = alarmlist;
|
||
|
struct gpio_private *todel = (struct gpio_private *)filp->private_data;
|
||
|
/* local copies while updating them: */
|
||
|
unsigned long a_high, a_low;
|
||
|
unsigned long some_alarms;
|
||
|
|
||
|
/* unlink from alarmlist and free the private structure */
|
||
|
|
||
|
if (p == todel) {
|
||
|
alarmlist = todel->next;
|
||
|
} else {
|
||
|
while (p->next != todel)
|
||
|
p = p->next;
|
||
|
p->next = todel->next;
|
||
|
}
|
||
|
|
||
|
kfree(todel);
|
||
|
/* Check if there are still any alarms set */
|
||
|
p = alarmlist;
|
||
|
some_alarms = 0;
|
||
|
a_high = 0;
|
||
|
a_low = 0;
|
||
|
while (p) {
|
||
|
if (p->minor == GPIO_MINOR_A) {
|
||
|
a_high |= p->highalarm;
|
||
|
a_low |= p->lowalarm;
|
||
|
}
|
||
|
|
||
|
if (p->highalarm | p->lowalarm) {
|
||
|
some_alarms = 1;
|
||
|
}
|
||
|
p = p->next;
|
||
|
}
|
||
|
|
||
|
spin_lock(&alarm_lock);
|
||
|
gpio_some_alarms = some_alarms;
|
||
|
gpio_pa_high_alarms = a_high;
|
||
|
gpio_pa_low_alarms = a_low;
|
||
|
spin_unlock(&alarm_lock);
|
||
|
|
||
|
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().
|
||
|
*/
|
||
|
|
||
|
unsigned long inline 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;
|
||
|
|
||
|
local_irq_save(flags);
|
||
|
dir_shadow = *dir_oe[priv->minor];
|
||
|
dir_shadow &= ~(arg & changeable_dir[priv->minor]);
|
||
|
*dir_oe[priv->minor] = dir_shadow;
|
||
|
local_irq_restore(flags);
|
||
|
|
||
|
if (priv->minor == GPIO_MINOR_A)
|
||
|
dir_shadow ^= 0xFF; /* Only 8 bits */
|
||
|
else
|
||
|
dir_shadow ^= 0x3FFFF; /* Only 18 bits */
|
||
|
return dir_shadow;
|
||
|
|
||
|
} /* setget_input */
|
||
|
|
||
|
unsigned long inline setget_output(struct gpio_private *priv, unsigned long arg)
|
||
|
{
|
||
|
unsigned long flags;
|
||
|
unsigned long dir_shadow;
|
||
|
|
||
|
local_irq_save(flags);
|
||
|
dir_shadow = *dir_oe[priv->minor];
|
||
|
dir_shadow |= (arg & changeable_dir[priv->minor]);
|
||
|
*dir_oe[priv->minor] = dir_shadow;
|
||
|
local_irq_restore(flags);
|
||
|
return dir_shadow;
|
||
|
} /* setget_output */
|
||
|
|
||
|
static int
|
||
|
gpio_leds_ioctl(unsigned int cmd, unsigned long arg);
|
||
|
|
||
|
static int
|
||
|
gpio_ioctl(struct inode *inode, struct file *file,
|
||
|
unsigned int cmd, unsigned long arg)
|
||
|
{
|
||
|
unsigned long flags;
|
||
|
unsigned long val;
|
||
|
unsigned long shadow;
|
||
|
struct gpio_private *priv = (struct gpio_private *)file->private_data;
|
||
|
if (_IOC_TYPE(cmd) != ETRAXGPIO_IOCTYPE) {
|
||
|
return -EINVAL;
|
||
|
}
|
||
|
|
||
|
switch (_IOC_NR(cmd)) {
|
||
|
case IO_READBITS: /* Use IO_READ_INBITS and IO_READ_OUTBITS instead */
|
||
|
// read the port
|
||
|
return *data_in[priv->minor];
|
||
|
break;
|
||
|
case IO_SETBITS:
|
||
|
local_irq_save(flags);
|
||
|
if (arg & 0x04)
|
||
|
printk("GPIO SET 2\n");
|
||
|
// set changeable bits with a 1 in arg
|
||
|
shadow = *data_out[priv->minor];
|
||
|
shadow |= (arg & changeable_bits[priv->minor]);
|
||
|
*data_out[priv->minor] = shadow;
|
||
|
local_irq_restore(flags);
|
||
|
break;
|
||
|
case IO_CLRBITS:
|
||
|
local_irq_save(flags);
|
||
|
if (arg & 0x04)
|
||
|
printk("GPIO CLR 2\n");
|
||
|
// clear changeable bits with a 1 in arg
|
||
|
shadow = *data_out[priv->minor];
|
||
|
shadow &= ~(arg & changeable_bits[priv->minor]);
|
||
|
*data_out[priv->minor] = shadow;
|
||
|
local_irq_restore(flags);
|
||
|
break;
|
||
|
case IO_HIGHALARM:
|
||
|
// set alarm when bits with 1 in arg go high
|
||
|
priv->highalarm |= arg;
|
||
|
spin_lock(&alarm_lock);
|
||
|
gpio_some_alarms = 1;
|
||
|
if (priv->minor == GPIO_MINOR_A) {
|
||
|
gpio_pa_high_alarms |= arg;
|
||
|
}
|
||
|
spin_unlock(&alarm_lock);
|
||
|
break;
|
||
|
case IO_LOWALARM:
|
||
|
// set alarm when bits with 1 in arg go low
|
||
|
priv->lowalarm |= arg;
|
||
|
spin_lock(&alarm_lock);
|
||
|
gpio_some_alarms = 1;
|
||
|
if (priv->minor == GPIO_MINOR_A) {
|
||
|
gpio_pa_low_alarms |= arg;
|
||
|
}
|
||
|
spin_unlock(&alarm_lock);
|
||
|
break;
|
||
|
case IO_CLRALARM:
|
||
|
// clear alarm for bits with 1 in arg
|
||
|
priv->highalarm &= ~arg;
|
||
|
priv->lowalarm &= ~arg;
|
||
|
spin_lock(&alarm_lock);
|
||
|
if (priv->minor == GPIO_MINOR_A) {
|
||
|
if (gpio_pa_high_alarms & arg ||
|
||
|
gpio_pa_low_alarms & arg) {
|
||
|
/* Must update the gpio_pa_*alarms masks */
|
||
|
}
|
||
|
}
|
||
|
spin_unlock(&alarm_lock);
|
||
|
break;
|
||
|
case IO_READDIR: /* Use IO_SETGET_INPUT/OUTPUT instead! */
|
||
|
/* Read direction 0=input 1=output */
|
||
|
return *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);
|
||
|
break;
|
||
|
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:
|
||
|
{
|
||
|
unsigned long dir_shadow;
|
||
|
dir_shadow = *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 = *data_in[priv->minor];
|
||
|
if (copy_to_user((unsigned long*)arg, &val, sizeof(val)))
|
||
|
return -EFAULT;
|
||
|
return 0;
|
||
|
break;
|
||
|
case IO_READ_OUTBITS:
|
||
|
/* *arg is result of reading the output shadow */
|
||
|
val = *data_out[priv->minor];
|
||
|
if (copy_to_user((unsigned long*)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, (unsigned long*)arg, sizeof(val)))
|
||
|
return -EFAULT;
|
||
|
val = setget_input(priv, val);
|
||
|
if (copy_to_user((unsigned long*)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, (unsigned long*)arg, sizeof(val)))
|
||
|
return -EFAULT;
|
||
|
val = setget_output(priv, val);
|
||
|
if (copy_to_user((unsigned long*)arg, &val, sizeof(val)))
|
||
|
return -EFAULT;
|
||
|
break;
|
||
|
default:
|
||
|
if (priv->minor == GPIO_MINOR_LEDS)
|
||
|
return gpio_leds_ioctl(cmd, arg);
|
||
|
else
|
||
|
return -EINVAL;
|
||
|
} /* switch */
|
||
|
|
||
|
return 0;
|
||
|
}
|
||
|
|
||
|
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;
|
||
|
LED_ACTIVE_SET_G(green);
|
||
|
LED_ACTIVE_SET_R(red);
|
||
|
break;
|
||
|
|
||
|
default:
|
||
|
return -EINVAL;
|
||
|
} /* switch */
|
||
|
|
||
|
return 0;
|
||
|
}
|
||
|
|
||
|
struct file_operations gpio_fops = {
|
||
|
.owner = THIS_MODULE,
|
||
|
.poll = gpio_poll,
|
||
|
.ioctl = gpio_ioctl,
|
||
|
.write = gpio_write,
|
||
|
.open = gpio_open,
|
||
|
.release = gpio_release,
|
||
|
};
|
||
|
|
||
|
|
||
|
/* main driver initialization routine, called from mem.c */
|
||
|
|
||
|
static __init int
|
||
|
gpio_init(void)
|
||
|
{
|
||
|
int res;
|
||
|
reg_intr_vect_rw_mask intr_mask;
|
||
|
|
||
|
/* 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 */
|
||
|
LED_NETWORK_SET(0);
|
||
|
LED_ACTIVE_SET(0);
|
||
|
LED_DISK_READ(0);
|
||
|
LED_DISK_WRITE(0);
|
||
|
|
||
|
printk("ETRAX FS GPIO driver v2.5, (c) 2003-2005 Axis Communications AB\n");
|
||
|
/* We call etrax_gpio_wake_up_check() from timer interrupt and
|
||
|
* from cpu_idle() in kernel/process.c
|
||
|
* The check in cpu_idle() reduces latency from ~15 ms to ~6 ms
|
||
|
* in some tests.
|
||
|
*/
|
||
|
if (request_irq(TIMER_INTR_VECT, gpio_poll_timer_interrupt,
|
||
|
SA_SHIRQ | SA_INTERRUPT,"gpio poll", &alarmlist)) {
|
||
|
printk("err: timer0 irq for gpio\n");
|
||
|
}
|
||
|
if (request_irq(GEN_IO_INTR_VECT, gpio_pa_interrupt,
|
||
|
SA_SHIRQ | SA_INTERRUPT,"gpio PA", &alarmlist)) {
|
||
|
printk("err: PA irq for gpio\n");
|
||
|
}
|
||
|
/* enable the gio and timer irq in global config */
|
||
|
intr_mask = REG_RD(intr_vect, regi_irq, rw_mask);
|
||
|
intr_mask.timer = 1;
|
||
|
intr_mask.gen_io = 1;
|
||
|
REG_WR(intr_vect, regi_irq, rw_mask, intr_mask);
|
||
|
|
||
|
return res;
|
||
|
}
|
||
|
|
||
|
/* this makes sure that gpio_init is called during kernel boot */
|
||
|
|
||
|
module_init(gpio_init);
|