diff options
author | Mikael Starvik <mikael.starvik@axis.com> | 2005-07-27 11:44:34 -0700 |
---|---|---|
committer | Linus Torvalds <torvalds@g5.osdl.org> | 2005-07-27 16:25:59 -0700 |
commit | 7e9204265b4ec6680fad9abc7a78b94087983916 (patch) | |
tree | 50ff709f7d37193bb56599a4e1646509d8e353ff /arch/cris/arch-v10/drivers/gpio.c | |
parent | 059163cabc01a15b9e2cf10e5de5b6dc06e0da1f (diff) |
[PATCH] CRIS update: drivers
Updates to device drivers.
* Use I/O and DMA allocators.
* Use wait_event_interruptible instead of interrutiple_sleep_on.
* Added spinlocks SMP.
* Changed restore_flags to local_irq_restore etc.
* Updated IDE driver include to fit 2.6.12.
Signed-off-by: Mikael Starvik <starvik@axis.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
Diffstat (limited to 'arch/cris/arch-v10/drivers/gpio.c')
-rw-r--r-- | arch/cris/arch-v10/drivers/gpio.c | 201 |
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 c095de82a0d..09963fe299a 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 |