--- /dev/null
+/*
+ * ETRAX CRISv32 general port I/O device
+ *
+ * Copyright (c) 1999-2006 Axis Communications AB
+ *
+ * Authors: Bjorn Wesen (initial version)
+ * Ola Knutsson (LED handling)
+ * Johan Adolfsson (read/set directions, write, port G,
+ * port to ETRAX FS.
+ *
+ */
+
+#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 <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/system.h>
+#include <asm/irq.h>
+
+#ifdef CONFIG_ETRAX_VIRTUAL_GPIO
+#include "../i2c.h"
+
+#define VIRT_I2C_ADDR 0x40
+#endif
+
+/* 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
+
+#ifdef CONFIG_ETRAX_VIRTUAL_GPIO
+static int virtual_gpio_ioctl(struct file *file, unsigned int cmd,
+ unsigned long arg);
+#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;
+
+static int gpio_some_alarms; /* Set if someone uses alarm */
+static unsigned long gpio_pa_high_alarms;
+static unsigned long gpio_pa_low_alarms;
+
+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;
+#ifdef CONFIG_ETRAX_VIRTUAL_GPIO
+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 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),
+#ifdef CONFIG_ETRAX_VIRTUAL_GPIO
+ &virtual_dummy,
+#endif
+};
+
+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),
+#ifdef CONFIG_ETRAX_VIRTUAL_GPIO
+ &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,
+ CONFIG_ETRAX_PD_CHANGEABLE_DIR,
+ CONFIG_ETRAX_PE_CHANGEABLE_DIR,
+#ifdef CONFIG_ETRAX_VIRTUAL_GPIO
+ 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,
+ CONFIG_ETRAX_PD_CHANGEABLE_BITS,
+ CONFIG_ETRAX_PE_CHANGEABLE_BITS,
+#ifdef CONFIG_ETRAX_VIRTUAL_GPIO
+ CONFIG_ETRAX_PV_CHANGEABLE_BITS,
+#endif
+};
+
+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),
+#ifdef CONFIG_ETRAX_VIRTUAL_GPIO
+ &virtual_rw_pv_oe,
+#endif
+};
+
+
+
+static unsigned int gpio_poll(struct file *file, struct 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(KERN_DEBUG "gpio_poll ready: mask 0x%08X\n", mask));
+ return mask;
+}
+
+int etrax_gpio_wake_up_check(void)
+{
+ struct gpio_private *priv;
+ unsigned long data = 0;
+ unsigned long flags;
+ int ret = 0;
+ spin_lock_irqsave(&alarm_lock, flags);
+ priv = alarmlist;
+ while (priv) {
+#ifdef CONFIG_ETRAX_VIRTUAL_GPIO
+ if (priv->minor == GPIO_MINOR_V)
+ data = (unsigned long)cached_virtual_gpio_read;
+ else {
+ data = *data_in[priv->minor];
+ if (priv->minor == GPIO_MINOR_A)
+ priv->lowalarm |= (1 << CONFIG_ETRAX_VIRTUAL_GPIO_INTERRUPT_PA_PIN);
+ }
+#else
+ data = *data_in[priv->minor];
+#endif
+ if ((data & priv->highalarm) ||
+ (~data & priv->lowalarm)) {
+ DP(printk(KERN_DEBUG
+ "etrax_gpio_wake_up_check %i\n", priv->minor));
+ wake_up_interruptible(&priv->alarm_wq);
+ ret = 1;
+ }
+ priv = priv->next;
+ }
+ spin_unlock_irqrestore(&alarm_lock, flags);
+ return ret;
+}
+
+static irqreturn_t
+gpio_poll_timer_interrupt(int irq, void *dev_id)
+{
+ 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)
+{
+ 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;
+#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(&alarm_lock);
+ tmp &= (gpio_pa_high_alarms | gpio_pa_low_alarms);
+ spin_unlock(&alarm_lock);
+
+#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);
+
+ 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... */
+#ifdef CONFIG_ETRAX_VIRTUAL_GPIO
+ if (priv->minor == GPIO_MINOR_V)
+ return -EFAULT;
+#endif
+ 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(KERN_DEBUG "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 = iminor(inode);
+
+ if (p > GPIO_MINOR_LAST)
+ return -EINVAL;
+
+ priv = kmalloc(sizeof(struct gpio_private), GFP_KERNEL);
+
+ if (!priv)
+ return -ENOMEM;
+ memset(priv, 0, sizeof(*priv));
+
+ priv->minor = p;
+
+ /* initialize the io/alarm struct */
+
+ 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;
+
+ /* link it into our alarmlist */
+ spin_lock_irq(&alarm_lock);
+ priv->next = alarmlist;
+ alarmlist = priv;
+ spin_unlock_irq(&alarm_lock);
+
+ 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;
+ unsigned long some_alarms;
+
+ /* unlink from alarmlist and free the private structure */
+
+ spin_lock_irq(&alarm_lock);
+ p = alarmlist;
+ todel = (struct gpio_private *)filp->private_data;
+
+ 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) {
+#ifdef CONFIG_ETRAX_VIRTUAL_GPIO
+ p->lowalarm |= (1 << CONFIG_ETRAX_VIRTUAL_GPIO_INTERRUPT_PA_PIN);
+#endif
+ a_high |= p->highalarm;
+ a_low |= p->lowalarm;
+ }
+
+ if (p->highalarm | p->lowalarm)
+ some_alarms = 1;
+ p = p->next;
+ }
+
+#ifdef CONFIG_ETRAX_VIRTUAL_GPIO
+ /* Variables 'some_alarms' and 'a_low' needs to be set here again
+ * to ensure that interrupt for virtual GPIO is handled.
+ */
+ some_alarms = 1;
+ a_low |= (1 << CONFIG_ETRAX_VIRTUAL_GPIO_INTERRUPT_PA_PIN);
+#endif
+
+ gpio_some_alarms = some_alarms;
+ gpio_pa_high_alarms = a_high;
+ gpio_pa_low_alarms = a_low;
+ spin_unlock_irq(&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().
+ */
+
+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;
+
+ 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 */
+#ifdef CONFIG_ETRAX_VIRTUAL_GPIO
+ else if (priv->minor == GPIO_MINOR_V)
+ dir_shadow ^= 0xFFFF; /* Only 16 bits */
+#endif
+ else
+ dir_shadow ^= 0x3FFFF; /* Only 18 bits */
+ return dir_shadow;
+
+} /* setget_input */
+
+inline unsigned long 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;
+
+#ifdef CONFIG_ETRAX_VIRTUAL_GPIO
+ if (priv->minor == GPIO_MINOR_V)
+ return virtual_gpio_ioctl(file, cmd, arg);
+#endif
+
+ 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);
+ /* 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);
+ /* 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_irqsave(&alarm_lock, flags);
+ gpio_some_alarms = 1;
+ if (priv->minor == GPIO_MINOR_A)
+ gpio_pa_high_alarms |= arg;
+ spin_unlock_irqrestore(&alarm_lock, flags);
+ break;
+ case IO_LOWALARM:
+ /* Set alarm when bits with 1 in arg go low. */
+ priv->lowalarm |= arg;
+ spin_lock_irqsave(&alarm_lock, flags);
+ gpio_some_alarms = 1;
+ if (priv->minor == GPIO_MINOR_A)
+ gpio_pa_low_alarms |= arg;
+ spin_unlock_irqrestore(&alarm_lock, flags);
+ break;
+ case IO_CLRALARM:
+ /* Clear alarm for bits with 1 in arg. */
+ priv->highalarm &= ~arg;
+ priv->lowalarm &= ~arg;
+ spin_lock_irqsave(&alarm_lock, flags);
+ 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_irqrestore(&alarm_lock, flags);
+ 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;
+}
+
+#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 = (struct gpio_private *)file->private_data;
+
+ switch (_IOC_NR(cmd)) {
+ case IO_SETBITS:
+ local_irq_save(flags);
+ /* Set changeable bits with a 1 in arg. */
+ i2c_read(VIRT_I2C_ADDR, (void *)&shadow, sizeof(shadow));
+ shadow |= ~*dir_oe[priv->minor];
+ shadow |= (arg & changeable_bits[priv->minor]);
+ i2c_write(VIRT_I2C_ADDR, (void *)&shadow, sizeof(shadow));
+ local_irq_restore(flags);
+ break;
+ case IO_CLRBITS:
+ local_irq_save(flags);
+ /* Clear changeable bits with a 1 in arg. */
+ i2c_read(VIRT_I2C_ADDR, (void *)&shadow, sizeof(shadow));
+ shadow |= ~*dir_oe[priv->minor];
+ shadow &= ~(arg & changeable_bits[priv->minor]);
+ i2c_write(VIRT_I2C_ADDR, (void *)&shadow, sizeof(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;
+ 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;
+ 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);
+ spin_unlock(&alarm_lock);
+ break;
+ 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 = cached_virtual_gpio_read;
+ val &= ~*dir_oe[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 */
+ i2c_read(VIRT_I2C_ADDR, (void *)&val, sizeof(val));
+ val &= *dir_oe[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.
+ */
+ unsigned short input_mask = ~*dir_oe[priv->minor];
+ 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;
+ 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, (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:
+ 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;
+ 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,
+};
+
+#ifdef CONFIG_ETRAX_VIRTUAL_GPIO
+static void
+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);
+
+ gpio_pa_low_alarms |= (1 << CONFIG_ETRAX_VIRTUAL_GPIO_INTERRUPT_PA_PIN);
+ gpio_some_alarms = 1;
+}
+#endif
+
+/* main driver initialization routine, called from mem.c */
+
+static __init int
+gpio_init(void)
+{
+ int res;
+
+ /* 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_GRP0_SET(0);
+ LED_NETWORK_GRP1_SET(0);
+ LED_ACTIVE_SET(0);
+ LED_DISK_READ(0);
+ LED_DISK_WRITE(0);
+
+ printk(KERN_INFO "ETRAX FS GPIO driver v2.5, (c) 2003-2007 "
+ "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(TIMER0_INTR_VECT, gpio_poll_timer_interrupt,
+ IRQF_SHARED | IRQF_DISABLED, "gpio poll", &alarmlist))
+ printk(KERN_ERR "timer0 irq for gpio\n");
+
+ if (request_irq(GIO_INTR_VECT, gpio_pa_interrupt,
+ IRQF_SHARED | IRQF_DISABLED, "gpio PA", &alarmlist))
+ printk(KERN_ERR "PA irq for gpio\n");
+
+#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);
projects / linux-2.6 / commitdiff