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path: root/arch/cris/arch-v10/drivers/gpio.c
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Diffstat (limited to 'arch/cris/arch-v10/drivers/gpio.c')
-rw-r--r--arch/cris/arch-v10/drivers/gpio.c201
1 files changed, 106 insertions, 95 deletions
diff --git a/arch/cris/arch-v10/drivers/gpio.c b/arch/cris/arch-v10/drivers/gpio.c
index c095de82a0da..09963fe299a7 100644
--- a/arch/cris/arch-v10/drivers/gpio.c
+++ b/arch/cris/arch-v10/drivers/gpio.c
@@ -1,4 +1,4 @@
-/* $Id: gpio.c,v 1.12 2004/08/24 07:19:59 starvik Exp $
+/* $Id: gpio.c,v 1.17 2005/06/19 17:06:46 starvik Exp $
*
* Etrax general port I/O device
*
@@ -9,6 +9,18 @@
* Johan Adolfsson (read/set directions, write, port G)
*
* $Log: gpio.c,v $
+ * Revision 1.17 2005/06/19 17:06:46 starvik
+ * Merge of Linux 2.6.12.
+ *
+ * Revision 1.16 2005/03/07 13:02:29 starvik
+ * Protect driver global states with spinlock
+ *
+ * Revision 1.15 2005/01/05 06:08:55 starvik
+ * No need to do local_irq_disable after local_irq_save.
+ *
+ * Revision 1.14 2004/12/13 12:21:52 starvik
+ * Added I/O and DMA allocators from Linux 2.4
+ *
* Revision 1.12 2004/08/24 07:19:59 starvik
* Whitespace cleanup
*
@@ -142,6 +154,7 @@
#include <asm/io.h>
#include <asm/system.h>
#include <asm/irq.h>
+#include <asm/arch/io_interface_mux.h>
#define GPIO_MAJOR 120 /* experimental MAJOR number */
@@ -194,6 +207,8 @@ static struct gpio_private *alarmlist = 0;
static int gpio_some_alarms = 0; /* Set if someone uses alarm */
static unsigned long gpio_pa_irq_enabled_mask = 0;
+static DEFINE_SPINLOCK(gpio_lock); /* Protect directions etc */
+
/* Port A and B use 8 bit access, but Port G is 32 bit */
#define NUM_PORTS (GPIO_MINOR_B+1)
@@ -241,6 +256,9 @@ static volatile unsigned char *dir_shadow[NUM_PORTS] = {
&port_pb_dir_shadow
};
+/* All bits in port g that can change dir. */
+static const unsigned long int changeable_dir_g_mask = 0x01FFFF01;
+
/* Port G is 32 bit, handle it special, some bits are both inputs
and outputs at the same time, only some of the bits can change direction
and some of them in groups of 8 bit. */
@@ -260,6 +278,7 @@ gpio_poll(struct file *file,
unsigned int mask = 0;
struct gpio_private *priv = (struct gpio_private *)file->private_data;
unsigned long data;
+ spin_lock(&gpio_lock);
poll_wait(file, &priv->alarm_wq, wait);
if (priv->minor == GPIO_MINOR_A) {
unsigned long flags;
@@ -270,10 +289,10 @@ gpio_poll(struct file *file,
*/
tmp = ~data & priv->highalarm & 0xFF;
tmp = (tmp << R_IRQ_MASK1_SET__pa0__BITNR);
- save_flags(flags); cli();
+ local_irq_save(flags);
gpio_pa_irq_enabled_mask |= tmp;
*R_IRQ_MASK1_SET = tmp;
- restore_flags(flags);
+ local_irq_restore(flags);
} else if (priv->minor == GPIO_MINOR_B)
data = *R_PORT_PB_DATA;
@@ -286,8 +305,11 @@ gpio_poll(struct file *file,
(~data & priv->lowalarm)) {
mask = POLLIN|POLLRDNORM;
}
+
+ spin_unlock(&gpio_lock);
DP(printk("gpio_poll ready: mask 0x%08X\n", mask));
+
return mask;
}
@@ -296,6 +318,7 @@ int etrax_gpio_wake_up_check(void)
struct gpio_private *priv = alarmlist;
unsigned long data = 0;
int ret = 0;
+ spin_lock(&gpio_lock);
while (priv) {
if (USE_PORTS(priv)) {
data = *priv->port;
@@ -310,6 +333,7 @@ int etrax_gpio_wake_up_check(void)
}
priv = priv->next;
}
+ spin_unlock(&gpio_lock);
return ret;
}
@@ -327,6 +351,7 @@ static irqreturn_t
gpio_pa_interrupt(int irq, void *dev_id, struct pt_regs *regs)
{
unsigned long tmp;
+ spin_lock(&gpio_lock);
/* Find what PA interrupts are active */
tmp = (*R_IRQ_READ1);
@@ -337,6 +362,8 @@ gpio_pa_interrupt(int irq, void *dev_id, struct pt_regs *regs)
*R_IRQ_MASK1_CLR = tmp;
gpio_pa_irq_enabled_mask &= ~tmp;
+ spin_unlock(&gpio_lock);
+
if (gpio_some_alarms) {
return IRQ_RETVAL(etrax_gpio_wake_up_check());
}
@@ -350,6 +377,9 @@ static ssize_t gpio_write(struct file * file, const char * buf, size_t count,
struct gpio_private *priv = (struct gpio_private *)file->private_data;
unsigned char data, clk_mask, data_mask, write_msb;
unsigned long flags;
+
+ spin_lock(&gpio_lock);
+
ssize_t retval = count;
if (priv->minor !=GPIO_MINOR_A && priv->minor != GPIO_MINOR_B) {
return -EFAULT;
@@ -372,7 +402,7 @@ static ssize_t gpio_write(struct file * file, const char * buf, size_t count,
data = *buf++;
if (priv->write_msb) {
for (i = 7; i >= 0;i--) {
- local_irq_save(flags); local_irq_disable();
+ local_irq_save(flags);
*priv->port = *priv->shadow &= ~clk_mask;
if (data & 1<<i)
*priv->port = *priv->shadow |= data_mask;
@@ -384,7 +414,7 @@ static ssize_t gpio_write(struct file * file, const char * buf, size_t count,
}
} else {
for (i = 0; i <= 7;i++) {
- local_irq_save(flags); local_irq_disable();
+ local_irq_save(flags);
*priv->port = *priv->shadow &= ~clk_mask;
if (data & 1<<i)
*priv->port = *priv->shadow |= data_mask;
@@ -396,6 +426,7 @@ static ssize_t gpio_write(struct file * file, const char * buf, size_t count,
}
}
}
+ spin_unlock(&gpio_lock);
return retval;
}
@@ -452,9 +483,14 @@ gpio_open(struct inode *inode, struct file *filp)
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;
-
+ struct gpio_private *p;
+ struct gpio_private *todel;
+
+ spin_lock(&gpio_lock);
+
+ p = alarmlist;
+ todel = (struct gpio_private *)filp->private_data;
+
/* unlink from alarmlist and free the private structure */
if (p == todel) {
@@ -476,7 +512,7 @@ gpio_release(struct inode *inode, struct file *filp)
p = p->next;
}
gpio_some_alarms = 0;
-
+ spin_unlock(&gpio_lock);
return 0;
}
@@ -491,14 +527,14 @@ unsigned long inline setget_input(struct gpio_private *priv, unsigned long arg)
*/
unsigned long flags;
if (USE_PORTS(priv)) {
- local_irq_save(flags); local_irq_disable();
+ local_irq_save(flags);
*priv->dir = *priv->dir_shadow &=
~((unsigned char)arg & priv->changeable_dir);
local_irq_restore(flags);
return ~(*priv->dir_shadow) & 0xFF; /* Only 8 bits */
} else if (priv->minor == GPIO_MINOR_G) {
/* We must fiddle with R_GEN_CONFIG to change dir */
- save_flags(flags); cli();
+ local_irq_save(flags);
if (((arg & dir_g_in_bits) != arg) &&
(arg & changeable_dir_g)) {
arg &= changeable_dir_g;
@@ -533,7 +569,7 @@ unsigned long inline setget_input(struct gpio_private *priv, unsigned long arg)
/* Must be a >120 ns delay before writing this again */
}
- restore_flags(flags);
+ local_irq_restore(flags);
return dir_g_in_bits;
}
return 0;
@@ -543,14 +579,14 @@ unsigned long inline setget_output(struct gpio_private *priv, unsigned long arg)
{
unsigned long flags;
if (USE_PORTS(priv)) {
- local_irq_save(flags); local_irq_disable();
+ local_irq_save(flags);
*priv->dir = *priv->dir_shadow |=
((unsigned char)arg & priv->changeable_dir);
local_irq_restore(flags);
return *priv->dir_shadow;
} else if (priv->minor == GPIO_MINOR_G) {
/* We must fiddle with R_GEN_CONFIG to change dir */
- save_flags(flags); cli();
+ local_irq_save(flags);
if (((arg & dir_g_out_bits) != arg) &&
(arg & changeable_dir_g)) {
/* Set bits in genconfig to set to output */
@@ -583,7 +619,7 @@ unsigned long inline setget_output(struct gpio_private *priv, unsigned long arg)
*R_GEN_CONFIG = genconfig_shadow;
/* Must be a >120 ns delay before writing this again */
}
- restore_flags(flags);
+ local_irq_restore(flags);
return dir_g_out_bits & 0x7FFFFFFF;
}
return 0;
@@ -598,22 +634,26 @@ gpio_ioctl(struct inode *inode, struct file *file,
{
unsigned long flags;
unsigned long val;
+ int ret = 0;
+
struct gpio_private *priv = (struct gpio_private *)file->private_data;
if (_IOC_TYPE(cmd) != ETRAXGPIO_IOCTYPE) {
return -EINVAL;
}
+ spin_lock(&gpio_lock);
+
switch (_IOC_NR(cmd)) {
case IO_READBITS: /* Use IO_READ_INBITS and IO_READ_OUTBITS instead */
// read the port
if (USE_PORTS(priv)) {
- return *priv->port;
+ ret = *priv->port;
} else if (priv->minor == GPIO_MINOR_G) {
- return (*R_PORT_G_DATA) & 0x7FFFFFFF;
+ ret = (*R_PORT_G_DATA) & 0x7FFFFFFF;
}
break;
case IO_SETBITS:
- local_irq_save(flags); local_irq_disable();
+ local_irq_save(flags);
// set changeable bits with a 1 in arg
if (USE_PORTS(priv)) {
*priv->port = *priv->shadow |=
@@ -624,7 +664,7 @@ gpio_ioctl(struct inode *inode, struct file *file,
local_irq_restore(flags);
break;
case IO_CLRBITS:
- local_irq_save(flags); local_irq_disable();
+ local_irq_save(flags);
// clear changeable bits with a 1 in arg
if (USE_PORTS(priv)) {
*priv->port = *priv->shadow &=
@@ -666,33 +706,34 @@ gpio_ioctl(struct inode *inode, struct file *file,
case IO_READDIR: /* Use IO_SETGET_INPUT/OUTPUT instead! */
/* Read direction 0=input 1=output */
if (USE_PORTS(priv)) {
- return *priv->dir_shadow;
+ ret = *priv->dir_shadow;
} else if (priv->minor == GPIO_MINOR_G) {
/* Note: Some bits are both in and out,
* Those that are dual is set here as well.
*/
- return (dir_g_shadow | dir_g_out_bits) & 0x7FFFFFFF;
+ ret = (dir_g_shadow | dir_g_out_bits) & 0x7FFFFFFF;
}
+ break;
case IO_SETINPUT: /* Use IO_SETGET_INPUT instead! */
/* Set direction 0=unchanged 1=input,
* return mask with 1=input
*/
- return setget_input(priv, arg) & 0x7FFFFFFF;
+ ret = setget_input(priv, arg) & 0x7FFFFFFF;
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) & 0x7FFFFFFF;
-
+ ret = setget_output(priv, arg) & 0x7FFFFFFF;
+ break;
case IO_SHUTDOWN:
SOFT_SHUTDOWN();
break;
case IO_GET_PWR_BT:
#if defined (CONFIG_ETRAX_SOFT_SHUTDOWN)
- return (*R_PORT_G_DATA & ( 1 << CONFIG_ETRAX_POWERBUTTON_BIT));
+ ret = (*R_PORT_G_DATA & ( 1 << CONFIG_ETRAX_POWERBUTTON_BIT));
#else
- return 0;
+ ret = 0;
#endif
break;
case IO_CFG_WRITE_MODE:
@@ -709,7 +750,7 @@ gpio_ioctl(struct inode *inode, struct file *file,
{
priv->clk_mask = 0;
priv->data_mask = 0;
- return -EPERM;
+ ret = -EPERM;
}
break;
case IO_READ_INBITS:
@@ -720,8 +761,7 @@ gpio_ioctl(struct inode *inode, struct file *file,
val = *R_PORT_G_DATA;
}
if (copy_to_user((unsigned long*)arg, &val, sizeof(val)))
- return -EFAULT;
- return 0;
+ ret = -EFAULT;
break;
case IO_READ_OUTBITS:
/* *arg is result of reading the output shadow */
@@ -731,36 +771,43 @@ gpio_ioctl(struct inode *inode, struct file *file,
val = port_g_data_shadow;
}
if (copy_to_user((unsigned long*)arg, &val, sizeof(val)))
- return -EFAULT;
+ ret = -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;
+ {
+ ret = -EFAULT;
+ break;
+ }
val = setget_input(priv, val);
if (copy_to_user((unsigned long*)arg, &val, sizeof(val)))
- return -EFAULT;
+ ret = -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;
+ {
+ ret = -EFAULT;
+ break;
+ }
val = setget_output(priv, val);
if (copy_to_user((unsigned long*)arg, &val, sizeof(val)))
- return -EFAULT;
+ ret = -EFAULT;
break;
default:
if (priv->minor == GPIO_MINOR_LEDS)
- return gpio_leds_ioctl(cmd, arg);
+ ret = gpio_leds_ioctl(cmd, arg);
else
- return -EINVAL;
+ ret = -EINVAL;
} /* switch */
-
- return 0;
+
+ spin_unlock(&gpio_lock);
+ return ret;
}
static int
@@ -802,60 +849,20 @@ struct file_operations gpio_fops = {
};
-static void __init gpio_init_port_g(void)
+void ioif_watcher(const unsigned int gpio_in_available,
+ const unsigned int gpio_out_available,
+ const unsigned char pa_available,
+ const unsigned char pb_available)
{
-#define GROUPA (0x0000FF3F)
-#define GROUPB (1<<6 | 1<<7)
-#define GROUPC (1<<30 | 1<<31)
-#define GROUPD (0x3FFF0000)
-#define GROUPD_LOW (0x00FF0000)
- unsigned long used_in_bits = 0;
- unsigned long used_out_bits = 0;
- if (genconfig_shadow & IO_STATE(R_GEN_CONFIG, scsi0, select)){
- used_in_bits |= GROUPA | GROUPB | 0 | 0;
- used_out_bits |= GROUPA | GROUPB | 0 | 0;
- }
- if (genconfig_shadow & IO_STATE(R_GEN_CONFIG, ata, select)) {
- used_in_bits |= GROUPA | GROUPB | GROUPC | (GROUPD & ~(1<<25|1<<26));
- used_out_bits |= GROUPA | GROUPB | GROUPC | GROUPD;
- }
+ unsigned long int flags;
+ D(printk("gpio.c: ioif_watcher called\n"));
+ D(printk("gpio.c: G in: 0x%08x G out: 0x%08x PA: 0x%02x PB: 0x%02x\n",
+ gpio_in_available, gpio_out_available, pa_available, pb_available));
- if (genconfig_shadow & IO_STATE(R_GEN_CONFIG, par0, select)) {
- used_in_bits |= (GROUPA & ~(1<<0)) | 0 | 0 | 0;
- used_out_bits |= (GROUPA & ~(1<<0)) | 0 | 0 | 0;
- }
- if (genconfig_shadow & IO_STATE(R_GEN_CONFIG, ser2, select)) {
- used_in_bits |= 0 | GROUPB | 0 | 0;
- used_out_bits |= 0 | GROUPB | 0 | 0;
- }
- /* mio same as shared RAM ? */
- if (genconfig_shadow & IO_STATE(R_GEN_CONFIG, mio, select)) {
- used_in_bits |= (GROUPA & ~(1<<0)) | 0 |0 |GROUPD_LOW;
- used_out_bits |= (GROUPA & ~(1<<0|1<<1|1<<2)) | 0 |0 |GROUPD_LOW;
- }
- if (genconfig_shadow & IO_STATE(R_GEN_CONFIG, scsi1, select)) {
- used_in_bits |= 0 | 0 | GROUPC | GROUPD;
- used_out_bits |= 0 | 0 | GROUPC | GROUPD;
- }
- if (genconfig_shadow & IO_STATE(R_GEN_CONFIG, scsi0w, select)) {
- used_in_bits |= GROUPA | GROUPB | 0 | (GROUPD_LOW | 1<<24);
- used_out_bits |= GROUPA | GROUPB | 0 | (GROUPD_LOW | 1<<24 | 1<<25|1<<26);
- }
+ spin_lock_irqsave(&gpio_lock, flags);
- if (genconfig_shadow & IO_STATE(R_GEN_CONFIG, par1, select)) {
- used_in_bits |= 0 | 0 | 0 | (GROUPD & ~(1<<24));
- used_out_bits |= 0 | 0 | 0 | (GROUPD & ~(1<<24));
- }
- if (genconfig_shadow & IO_STATE(R_GEN_CONFIG, ser3, select)) {
- used_in_bits |= 0 | 0 | GROUPC | 0;
- used_out_bits |= 0 | 0 | GROUPC | 0;
- }
- /* mio same as shared RAM-W? */
- if (genconfig_shadow & IO_STATE(R_GEN_CONFIG, mio_w, select)) {
- used_in_bits |= (GROUPA & ~(1<<0)) | 0 | 0 |GROUPD_LOW;
- used_out_bits |= (GROUPA & ~(1<<0|1<<1|1<<2)) | 0 | 0 |GROUPD_LOW;
- }
- /* TODO: USB p2, parw, sync ser3? */
+ dir_g_in_bits = gpio_in_available;
+ dir_g_out_bits = gpio_out_available;
/* Initialise the dir_g_shadow etc. depending on genconfig */
/* 0=input 1=output */
@@ -868,10 +875,7 @@ static void __init gpio_init_port_g(void)
if (genconfig_shadow & IO_STATE(R_GEN_CONFIG, g24dir, out))
dir_g_shadow |= (1 << 24);
- dir_g_in_bits = ~used_in_bits;
- dir_g_out_bits = ~used_out_bits;
-
- changeable_dir_g = 0x01FFFF01; /* all that can change dir */
+ changeable_dir_g = changeable_dir_g_mask;
changeable_dir_g &= dir_g_out_bits;
changeable_dir_g &= dir_g_in_bits;
/* Correct the bits that can change direction */
@@ -880,6 +884,7 @@ static void __init gpio_init_port_g(void)
dir_g_in_bits &= ~changeable_dir_g;
dir_g_in_bits |= (~dir_g_shadow & changeable_dir_g);
+ spin_unlock_irqrestore(&gpio_lock, flags);
printk(KERN_INFO "GPIO port G: in_bits: 0x%08lX out_bits: 0x%08lX val: %08lX\n",
dir_g_in_bits, dir_g_out_bits, (unsigned long)*R_PORT_G_DATA);
@@ -896,6 +901,7 @@ gpio_init(void)
#if defined (CONFIG_ETRAX_CSP0_LEDS)
int i;
#endif
+ printk("gpio init\n");
/* do the formalities */
@@ -919,8 +925,13 @@ gpio_init(void)
#endif
#endif
- gpio_init_port_g();
- printk(KERN_INFO "ETRAX 100LX GPIO driver v2.5, (c) 2001, 2002 Axis Communications AB\n");
+ /* The I/O interface allocation watcher will be called when
+ * registering it. */
+ if (cris_io_interface_register_watcher(ioif_watcher)){
+ printk(KERN_WARNING "gpio_init: Failed to install IO if allocator watcher\n");
+ }
+
+ printk(KERN_INFO "ETRAX 100LX GPIO driver v2.5, (c) 2001, 2002, 2003, 2004 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
generated by cgit v1.2.3 (git 2.25.1) at 2024-04-27 16:08:37 +0000