diff options
Diffstat (limited to 'linux/openslug-kernel-2.6.9/nslu2-io.c')
| -rw-r--r-- | linux/openslug-kernel-2.6.9/nslu2-io.c | 651 |
1 files changed, 651 insertions, 0 deletions
diff --git a/linux/openslug-kernel-2.6.9/nslu2-io.c b/linux/openslug-kernel-2.6.9/nslu2-io.c index e69de29bb2..ad5bdc221d 100644 --- a/linux/openslug-kernel-2.6.9/nslu2-io.c +++ b/linux/openslug-kernel-2.6.9/nslu2-io.c @@ -0,0 +1,651 @@ +//============================================================================= +// +// nslu2-io.c version 0.1.0 +// Author: Karen Spearel <kas11 at tampabay.rr.com> +// please report problems/bugs directly to the address above +// +// NOTE: THIS IS INCOMPLETE. INCLUDED ONLY TO KEEP FROM BREAKING THE BUILD, +// IT BEEPS AND SENDS A MESSAGE TO /proc/poweroff. EVENTUALLY IT +// WILL TALK TO THE n2_pbuttond DAEMON. EVENTUALLY THE LED DRIVER +// WILL TALK TO SOME USERLAND APP BUT ***NOT*** THE NASTY SETLEDS. +// +//============================================================================= +// GPIO Function State +// 0 Red LED Status +// 1 Green LED Ready = 1 +// 2 Disk 2 LED On = 0 +// 3 Disk 1 LED On = 0 +// 4 Buzzer +// 5 Power Button Pressed = 1 +// 8 Power Down Output = 1 powers down N2 +// 12 Reset Pressed = 0 +//============================================================================= +// this driver is N2 specific and is purposely designed to do the minimum +// necessary to provide the necessary services given the limited memory resources +// of the N2. As OpenSlug develops, addition features will be added as +// suggested by community leadership. +// +// The Userland apps such as SetLeds are just to crufty to bother with. +// This driver makes no attempt to do so...one day a Userland app will appear +// ...until then, this does very little. +//============================================================================= + +#include <linux/config.h> +#include <linux/version.h> +#include <linux/module.h> +#include <linux/utsname.h> +#include <linux/kernel.h> +#include <linux/major.h> +#include <linux/string.h> +#include <linux/proc_fs.h> +#include <linux/slab.h> +#include <linux/init.h> +#include <linux/errno.h> +#include <linux/fs.h> +#include <linux/miscdevice.h> +#include <linux/device.h> +#include <linux/interrupt.h> +#include <linux/moduleparam.h> +#include <linux/timer.h> + +#include <asm/system.h> +#include <asm/uaccess.h> +#include <asm/hardware.h> +#include <asm-arm/irq.h> +#include <asm-arm/delay.h> + +// Print kernel error +#define P_ERROR(args...) \ + printk(KERN_ERR DRV_NAME ": " args) +// Print kernel warning +#define P_WARN(args...) \ + printk(KERN_WARNING DRV_NAME ": " args) +// Print kernel notice +#define P_NOTICE(args...) \ + printk(KERN_NOTICE DRV_NAME ": " args) +// Print kernel info +#define P_INFO(args...) \ + printk(KERN_INFO DRV_NAME ": " args) +// Print verbose message. Enabled/disabled by 'log_level' param +#define P_VERBOSE(args...) \ + if (log_level >= 1) printk(DRV_NAME ": " args) +// Print debug message. Enabled/disabled by 'log_level' param +#define P_DEBUG(args...) \ + if (log_level >= 2) { \ + printk("%s: %s()\n", DRV_NAME, __FUNCTION__); \ + printk(args); } + +#ifdef DEBUG +// Print trace message +#define TRACE \ + if (log_level >= 2) printk("%s: %s(): line %d\n", \ + DRV_NAME, __FUNCTION__, __LINE__) +#else +// no trace +#define TRACE +#endif + +#define VERSION "0.1.1" + +#define N2RB_MAJOR 60 +#define N2PB_MAJOR 61 +#define N2BZ_MAJOR 62 +#define N2LM_MAJOR 126 + +#define N2PB_IRQ 22 //gpio5 +#define N2RB_IRQ 29 //gpio12 + +#define N2_BEEP_DUR_LONG 2000 +#define N2_BEEP_DUR_MED 400 +#define N2_BEEP_DUR_SHORT 100 +#define N2_BEEP_PITCH_HIGH 250 +#define N2_BEEP_PITCH_MED 500 +#define N2_BEEP_PITCH_LOW 1000 +#define N2_LONG_DELAY 30000 + +#define N2_BZ_GPIO 4 +#define N2_PB_GPIO 5 +#define N2_PO_GPIO 8 //power off +#define N2_RB_GPIO 12 + +#define GPIO_BZ_BM 0x0010 //b0000 0000 0001 0000 +#define GPIO_PB_BM 0x0020 //b0000 0000 0010 0000 +#define GPIO_PO_BM 0x0100 //b0000 0001 0000 0000 +#define GPIO_RB_BM 0x1000 //b0001 0000 0000 0000 + +#define NOERR 0 + +#define RB_DELAY 50 +#define PB_DELAY 20 + +#define PWR_OFF_STR "poweroff" + + +// ioctls -- THESE NEED TO BE PROPERLY DEFINED + +#define N2LM_ON 0 +#define N2LM_OFF 1 +#define N2LM_BLINK 2 +#define N2LM_ALT 3 +#define N2LM_ALL_ON 4 +#define N2LM_ALL_OFF 5 + +#define PHYS_LEDS 4 +#define BLINK_DELAY 25 + +static int n2lm_ioctl(struct inode * inode, struct file * file, unsigned int cmd, unsigned long arg); + + + +// OR Masks to turn these LEDs ON + +#define RS_RED_ON 0x00000001 //0b0000 0000 0000 0010 +#define RS_GRN_ON 0x00000002 //0b0000 0000 0000 0001 +#define RS_YEL_ON 0x00000003 //0b0000 0000 0000 0011 + +// AND Masks to turn these LEDs OFF + +#define RS_RED_OFF 0xfffffffe //0b1111 1111 1111 1101 +#define RS_GRN_OFF 0xfffffffd //0b1111 1111 1111 1110 +#define RS_YEL_OFF 0xfffffffc //0b1111 1111 1111 1100 + +// AND Masks to turn these LEDs ON + +#define DISK1_ON 0xfffffff7 //0b1111 1111 1111 0111 +#define DISK2_ON 0xfffffffb //0b1111 1111 1111 1011 + +// Or Masks to turn these LEDs OFF + +#define DISK1_OFF 0x00000008 //0b0000 0000 0000 1000 +#define DISK2_OFF 0x00000004 //0b0000 0000 0000 0100 + +// EOR masks for toggling LEDs on/off + +#define RS_RG_ALT 0x00000003 //eor mask to toggle rs rg bits +#define RS_GRN_TGL 0x00000002 +#define RS_RED_TGL 0x00000001 +#define DISK1_TGL 0x00000008 +#define DISK2_TGL 0x00000004 + +// The LED names for switches + +#define LED_RS_RED 0 +#define LED_RS_GRN 1 +#define LED_DISK1 2 +#define LED_DISK2 3 +#define LED_ALL 4 + +static long init_jiffy = 0; //jiffies at init time +static int rb_presses = 0; //number of reset button presses + +DECLARE_WAIT_QUEUE_HEAD(n2rb_waitq); +DECLARE_WAIT_QUEUE_HEAD(n2pb_waitq); + +static struct timer_list n2lm_rsg_timer; //rs green +static struct timer_list n2lm_rsr_timer; //rs red +static struct timer_list n2lm_d1_timer; //drive 1 +static struct timer_list n2lm_d2_timer; //drive 2 +static struct timer_list n2rb_timer; +static struct timer_list n2pb_timer; + + +//================================================================================================== +// +// Blinking is handled entirely by the 4 timer handlers. On timeout, the bit in the +// GPIO output register is xor'd with a mask corresponding to the selected led which simply +// flips that bit. No record of what any of the other leds is doing is needed. +// +//================================================================================================== +// this blinks rs green or green/yellow if rs red is on +static void n2lm_rsg_handler(unsigned long data) +{ + *IXP4XX_GPIO_GPOUTR ^= RS_GRN_TGL; //flip the led + n2lm_rsg_timer.expires = jiffies + BLINK_DELAY; //next timeout + add_timer(&n2lm_rsg_timer); //reinit timer + return; +} + +// this blinks or alternates rs red green... inited wit green on/red off +static void n2lm_rsr_handler(unsigned long data) +{ + *IXP4XX_GPIO_GPOUTR ^= n2lm_rsr_timer.data; + n2lm_rsr_timer.expires = jiffies + BLINK_DELAY; + add_timer(&n2lm_rsr_timer); + return; +} +// blinks disk 1 +static void n2lm_d1_handler(unsigned long data) +{ + *IXP4XX_GPIO_GPOUTR ^= DISK1_TGL; + n2lm_d1_timer.expires = jiffies + BLINK_DELAY; + add_timer(&n2lm_d1_timer); + return; +} +// blinks disk 2 +static void n2lm_d2_handler(unsigned long data) +{ + *IXP4XX_GPIO_GPOUTR ^= DISK2_TGL; + n2lm_d2_timer.expires = jiffies + BLINK_DELAY; + add_timer(&n2lm_d2_timer); + return; +} + +//================================================================================================== + +static void n2lm_timer_start(unsigned long led) +{ + + printk(KERN_DEBUG "timer: %ld\n",led); + + switch(led) { + case LED_RS_RED: + n2lm_rsr_timer.expires = jiffies + BLINK_DELAY; + n2lm_rsr_timer.function = n2lm_rsr_handler; + add_timer(&n2lm_rsr_timer); + break; + + case LED_RS_GRN: + n2lm_rsg_timer.expires = jiffies + BLINK_DELAY; + n2lm_rsg_timer.function = n2lm_rsg_handler; + add_timer(&n2lm_rsg_timer); + break; + + case LED_DISK1: + n2lm_d1_timer.expires = jiffies + BLINK_DELAY; + n2lm_d1_timer.function = n2lm_d1_handler; + add_timer(&n2lm_d1_timer); + break; + + case LED_DISK2: + n2lm_d2_timer.expires = jiffies + BLINK_DELAY; + n2lm_d2_timer.function = n2lm_d2_handler; + add_timer(&n2lm_d2_timer); + break; + + default: + break; + } + return; +} + +//================================================================================================== + +static void n2lm_timer_stop(unsigned long led) +{ + switch (led) { + case LED_RS_RED: + del_timer(&n2lm_rsr_timer); + break; + case LED_RS_GRN: + del_timer(&n2lm_rsg_timer); + break; + case LED_DISK1: + del_timer(&n2lm_d1_timer); + break; + case LED_DISK2: + del_timer(&n2lm_d2_timer); + break; + default: + break; + } + return; +} + +//-------------------------------------------------------------------------------------------------- + +static void n2lm_timer_stop_all(void) +{ + del_timer(&n2lm_rsg_timer); + del_timer(&n2lm_rsr_timer); + del_timer(&n2lm_d1_timer); + del_timer(&n2lm_d2_timer); + return; +} +//-------------------------------------------------------------------------------------------------- + +static void n2lm_ledon(unsigned long led) +{ + + printk("ledon: %ld\n", led); + + switch (led) { + case LED_RS_RED: + *IXP4XX_GPIO_GPOUTR |= RS_RED_ON; //1 + return; + case LED_RS_GRN: + *IXP4XX_GPIO_GPOUTR |= RS_GRN_ON; //2 + return; + case LED_DISK1: + *IXP4XX_GPIO_GPOUTR &= DISK1_ON; //0xfffffffb + return; + case LED_DISK2: + *IXP4XX_GPIO_GPOUTR &= DISK2_ON; //0xfffffff7 + return; + case LED_ALL: //all green + *IXP4XX_GPIO_GPOUTR |= RS_GRN_ON; + *IXP4XX_GPIO_GPOUTR &= (DISK1_ON & DISK2_ON); + return; + } +} + +//-------------------------------------------------------------------------------------------------- + +static void n2lm_ledoff(unsigned long led) +{ + + switch (led) { + case LED_RS_RED: + *IXP4XX_GPIO_GPOUTR &= RS_RED_OFF; //0xffffffffe + return; + case LED_RS_GRN: + *IXP4XX_GPIO_GPOUTR &= RS_GRN_OFF; //0xfffffffd + return; + case LED_DISK1: + *IXP4XX_GPIO_GPOUTR |= DISK1_OFF; //0x00000004 + return; + case LED_DISK2: + *IXP4XX_GPIO_GPOUTR |= DISK2_OFF; //0x00000008 + return; + case LED_ALL: + *IXP4XX_GPIO_GPOUTR &= (RS_GRN_OFF & RS_RED_OFF); + *IXP4XX_GPIO_GPOUTR |= (DISK1_OFF | DISK2_OFF); + } +} + +//================================================================================================== + +static int n2lm_ioctl(struct inode *inode, struct file *file, unsigned int cmd, unsigned long led) +{ + + printk(KERN_DEBUG "cmd=%d, led=%ld\n", cmd, led); + + if (led < 0 || led >= PHYS_LEDS) + return -EINVAL; + + switch (cmd ) { + case N2LM_ON: + n2lm_timer_stop(led); + n2lm_ledon(led); + break; + + case N2LM_OFF: + n2lm_timer_stop(led); + n2lm_ledoff(led); + break; + + case N2LM_BLINK: + n2lm_ledon(led); + if (led == LED_RS_RED) + n2lm_rsr_timer.data = RS_RED_TGL; + if (led == LED_RS_GRN) + n2lm_rsr_timer.data = RS_GRN_TGL; + n2lm_timer_start(led); + break; + + case N2LM_ALT: + if (led == LED_RS_RED) + { + n2lm_ledon(LED_RS_GRN); + n2lm_ledoff(LED_RS_RED); + n2lm_rsr_timer.data = RS_RG_ALT; + n2lm_timer_start(LED_RS_RED); + break; + } else + return -EINVAL; + + case N2LM_ALL_ON: + n2lm_timer_stop_all(); + n2lm_ledon(LED_ALL); + break; + + case N2LM_ALL_OFF: + n2lm_timer_stop_all(); + n2lm_ledoff(LED_ALL); + break; + + default: + return -EINVAL; + } + + return NOERR; +} + +static struct file_operations n2lm_fops = { + .owner = THIS_MODULE, + .ioctl = n2lm_ioctl, +}; +//================================================================================================== +// We can't do anything fancy here since the system tick rate is far below that required to +// generate a desirable tone. Therefore we haven't much choice but to use a busy loop until +// I get up to speed on the timers. The saving grace is that for the normal uses, nothing +// important should be haprepening. +//================================================================================================== + +static void n2_beep(int tone_delay, int duration) +{ + int i; + + *IXP4XX_GPIO_GPOER &= ~GPIO_BZ_BM; + + for (i = 1; i < duration; i++) { + *IXP4XX_GPIO_GPOUTR &= ~GPIO_BZ_BM; + udelay(tone_delay); + *IXP4XX_GPIO_GPOUTR |= GPIO_BZ_BM; + udelay(tone_delay); + } + *IXP4XX_GPIO_GPOER |= GPIO_BZ_BM; + + return; +} + +//================================================================================================== + +static irqreturn_t n2pb_handler (int irq, void *dev_id, struct pt_regs *regs) +{ + void *ret; + + wake_up(&n2pb_waitq); + remove_proc_entry(PWR_OFF_STR, NULL); //no parent + n2_beep(N2_BEEP_PITCH_MED, N2_BEEP_DUR_MED); + ret = create_proc_entry(PWR_OFF_STR, 0, NULL); + +// WARNING: This is RUDE...it unconditionally pulls the power plug +// your data will be at risk...since this is just a test system +// I am leaving it enabled...eventually userland needs to get the +// message, do an orderly shutdown and use an ioctl or something in +// /proc/powerdowm to actually have us pull the plug. + + *IXP4XX_GPIO_GPOER &= ~GPIO_PO_BM; // enable the pwr cntl gpio + *IXP4XX_GPIO_GPOUTR |= GPIO_PO_BM; // do the deed + + printk(KERN_DEBUG "cpe ret = %p\n", ret); + return IRQ_HANDLED; +} + +//================================================================================================== +// +//static void do_rb_timeout(unsigned long data) +//{ +// int i; +// +// for (i = 0; i < rb_presses; i++) +// n2_beep(N2_BEEP_PITCH_MED,N2_BEEP_DUR_SHORT); +// return; +//} +// +//================================================================================================== +// does nothing -- waiting for userland to define +// This thing is sorta braindead...edge triggered IRQs aren't available in the drivers yet...so +// we hang in a loop until the button is no longer pressed +static irqreturn_t n2rb_handler (int irq, void *dev_id, struct pt_regs *regs) +{ + + unsigned long test[] = { 5,0, 0,0, 1,0, 0,1, 1,1, 0,2, 1,2, 0,3, 1,3, 2,0, 1,0, 2,1, 1,1, 2,2, 1,2, 2,3, 1,3, 5,0, 3,1, 5,0, 4,0 }; + + printk(KERN_DEBUG "Reset Entry IRQ=%d Presses= %d Jiffies= %08lx\n", irq, rb_presses, jiffies); + + wake_up(&n2rb_waitq); + while ((*IXP4XX_GPIO_GPINR & GPIO_RB_BM) == 0) + ; //wait for button release + + if (rb_presses == 21) { + rb_presses = 0; + } + n2lm_ioctl(NULL,NULL,test[rb_presses*2], test[rb_presses*2+1]); + rb_presses++; + +// if (rb_presses == 0) { +// init_jiffy = jiffies; +// init_timer (&n2rb_timer); +// n2rb_timer.function = do_rb_timeout; +// }; +// +// if (rb_presses == 8) +// rb_presses = 0; +// if (rb_presses & 1) +// n2lm_ledon(test[rb_presses]); +// else +// n2lm_ledoff(test[rb_presses]); +// +// n2rb_timer.expires = (jiffies + RB_DELAY); +// add_timer (&n2rb_timer); +// if (rb_presses < 5) { +// if (rb_presses > 0) +// n2lm_ledoff(rb_presses); +// n2lm_ledon(++rb_presses); +// n2lm_timer_start(rb_presses); +// }; + + printk(KERN_DEBUG "Reset Exit IRQ=%d Presses= %d Jiffies= %08lx\n", irq, rb_presses, jiffies); + return IRQ_HANDLED; +} + +//================================================================================================== +// What to do here is majorly undetermined... + +static int n2rb_read (struct file *filp, char __user *buffer, size_t count, loff_t *ppos) +{ + printk(KERN_DEBUG "Reset Button Wait\n"); + interruptible_sleep_on(&n2rb_waitq); + return copy_to_user(buffer, "reset", 5) ? -EFAULT : 5; + +} + +//================================================================================================== +// What to do here is majorly undetermined... + +static int n2pb_read (struct file *filp, char __user *buffer, size_t count, loff_t *ppos) +{ + printk(KERN_DEBUG "Power Button Wait\n"); + interruptible_sleep_on(&n2pb_waitq); + return copy_to_user(buffer, "poweroff", 8) ? -EFAULT : 8; + +} + +//-------------------------------------------------------------------------------------------------- + +static struct file_operations n2rb_fops = { + .owner = THIS_MODULE, + .read = n2rb_read, +}; + +//-------------------------------------------------------------------------------------------------- + +static struct file_operations n2pb_fops = { + .owner = THIS_MODULE, + .read = n2pb_read, +}; + +//================================================================================================== + +static void n2iom_initarch(void) +{ + printk(KERN_DEBUG "setup_interrupts - jiffies=%ld init_jiffy=%ld\n", jiffies, init_jiffy); + + *IXP4XX_GPIO_GPISR = 0x20400000; // read the 2 irqs to clr + gpio_line_config(N2_RB_GPIO, IXP4XX_GPIO_IN | IXP4XX_GPIO_ACTIVE_LOW); + gpio_line_isr_clear(N2_RB_GPIO); + gpio_line_config(N2_PB_GPIO, IXP4XX_GPIO_IN | IXP4XX_GPIO_ACTIVE_HIGH); + gpio_line_isr_clear(N2_PB_GPIO); + + init_timer(&n2lm_rsg_timer); + init_timer(&n2lm_rsr_timer); + init_timer(&n2lm_d1_timer); + init_timer(&n2lm_d2_timer); + init_timer(&n2rb_timer); + init_timer(&n2pb_timer); + + *IXP4XX_GPIO_GPOER &= 0xfffffff0; //enable gpio 0-3 + *IXP4XX_GPIO_GPOUTR |= 0x00000003; //turn off the leds + *IXP4XX_GPIO_GPOUTR &= 0xfffffffc; + n2lm_ledon(LED_ALL); + n2_beep(N2_BEEP_PITCH_MED, N2_BEEP_DUR_SHORT); + n2lm_ledoff(LED_ALL); + + return; +} + +//================================================================================================== + +static int __init n2iom_init(void) +{ + printk(KERN_INFO "NSLU2 Misc I/O Driver Version %s (C) Karen Spearel\n", VERSION); + + init_jiffy = jiffies; + printk(KERN_DEBUG "init_jiffy=%ld\n",init_jiffy); + n2iom_initarch(); + + if (register_chrdev(N2RB_MAJOR, "n2_rb", &n2pb_fops) < NOERR) { + printk(KERN_DEBUG "Reset Button Major %d not available\n", N2RB_MAJOR); + return -EBUSY; + } + if (register_chrdev(N2PB_MAJOR, "n2_pb", &n2rb_fops) < NOERR) { + printk(KERN_DEBUG "Power Button Major %d not available\n", N2PB_MAJOR); + return -EBUSY; + } + if (register_chrdev(N2LM_MAJOR, "n2_leds", &n2lm_fops) < NOERR) { + printk(KERN_DEBUG "Led Manager Major %d not available\n", N2LM_MAJOR); + return -EBUSY; + } + if (request_irq(N2RB_IRQ, &n2rb_handler, SA_INTERRUPT, "n2_rb", NULL) < NOERR) { + printk(KERN_DEBUG "Reset Button IRQ %d not available\n", N2RB_IRQ); + return -EIO; + } + if (request_irq(N2PB_IRQ, &n2pb_handler, SA_INTERRUPT, "n2_pb", NULL) < NOERR) { + printk(KERN_DEBUG "Power Button IRQ %d not available\n", N2PB_IRQ); + return -EIO; + } + + enable_irq(N2PB_IRQ); + enable_irq(N2RB_IRQ); + return (NOERR); +} + +//================================================================================================== + +static void __exit n2iom_exit(void) +{ + remove_proc_entry(PWR_OFF_STR, NULL); + del_timer(&n2rb_timer); + free_irq(N2RB_IRQ,NULL); + unregister_chrdev(N2PB_MAJOR, "n2pb"); + del_timer(&n2pb_timer); + free_irq(N2PB_IRQ, NULL); + unregister_chrdev(N2RB_MAJOR, "n2rb" ); + del_timer(&n2lm_rsg_timer); + del_timer(&n2lm_rsr_timer); + del_timer(&n2lm_d1_timer); + del_timer(&n2lm_d2_timer); + unregister_chrdev(N2LM_MAJOR, "n2lm" ); +} + +module_init (n2iom_init); +module_exit (n2iom_exit); + +MODULE_AUTHOR("Karen Spearel <kas11@tampabay.rr.com>"); +MODULE_DESCRIPTION("NSLU2 Buttons/LEDs IO Driver"); +MODULE_LICENSE("GPL"); +static int debug = 7; +module_param(debug, int, 0644); +MODULE_PARM_DESC(debug, "Debugging enabled = 1"); + |