diff options
Diffstat (limited to 'drivers/char/lcd.c')
| -rw-r--r-- | drivers/char/lcd.c | 683 |
1 files changed, 683 insertions, 0 deletions
diff --git a/drivers/char/lcd.c b/drivers/char/lcd.c new file mode 100644 index 000000000000..cf01a720eb2e --- /dev/null +++ b/drivers/char/lcd.c @@ -0,0 +1,683 @@ +/* + * LCD, LED and Button interface for Cobalt + * + * This file is subject to the terms and conditions of the GNU General Public + * License. See the file "COPYING" in the main directory of this archive + * for more details. + * + * Copyright (C) 1996, 1997 by Andrew Bose + * + * Linux kernel version history: + * March 2001: Ported from 2.0.34 by Liam Davies + * + */ + +#define RTC_IO_EXTENT 0x10 /*Only really two ports, but... */ + +#include <linux/config.h> +#include <linux/types.h> +#include <linux/errno.h> +#include <linux/miscdevice.h> +#include <linux/slab.h> +#include <linux/ioport.h> +#include <linux/fcntl.h> +#include <linux/mc146818rtc.h> +#include <linux/netdevice.h> +#include <linux/sched.h> +#include <linux/delay.h> + +#include <asm/io.h> +#include <asm/uaccess.h> +#include <asm/system.h> +#include <linux/delay.h> + +#include "lcd.h" + +static DEFINE_SPINLOCK(lcd_lock); + +static int lcd_ioctl(struct inode *inode, struct file *file, + unsigned int cmd, unsigned long arg); + +static unsigned int lcd_present = 1; + +/* used in arch/mips/cobalt/reset.c */ +int led_state = 0; + +#if defined(CONFIG_TULIP) && 0 + +#define MAX_INTERFACES 8 +static linkcheck_func_t linkcheck_callbacks[MAX_INTERFACES]; +static void *linkcheck_cookies[MAX_INTERFACES]; + +int lcd_register_linkcheck_func(int iface_num, void *func, void *cookie) +{ + if (iface_num < 0 || + iface_num >= MAX_INTERFACES || + linkcheck_callbacks[iface_num] != NULL) + return -1; + linkcheck_callbacks[iface_num] = (linkcheck_func_t) func; + linkcheck_cookies[iface_num] = cookie; + return 0; +} +#endif + +static int lcd_ioctl(struct inode *inode, struct file *file, + unsigned int cmd, unsigned long arg) +{ + struct lcd_display button_display; + unsigned long address, a; + + switch (cmd) { + case LCD_On: + udelay(150); + BusyCheck(); + LCDWriteInst(0x0F); + break; + + case LCD_Off: + udelay(150); + BusyCheck(); + LCDWriteInst(0x08); + break; + + case LCD_Reset: + udelay(150); + LCDWriteInst(0x3F); + udelay(150); + LCDWriteInst(0x3F); + udelay(150); + LCDWriteInst(0x3F); + udelay(150); + LCDWriteInst(0x3F); + udelay(150); + LCDWriteInst(0x01); + udelay(150); + LCDWriteInst(0x06); + break; + + case LCD_Clear: + udelay(150); + BusyCheck(); + LCDWriteInst(0x01); + break; + + case LCD_Cursor_Left: + udelay(150); + BusyCheck(); + LCDWriteInst(0x10); + break; + + case LCD_Cursor_Right: + udelay(150); + BusyCheck(); + LCDWriteInst(0x14); + break; + + case LCD_Cursor_Off: + udelay(150); + BusyCheck(); + LCDWriteInst(0x0C); + break; + + case LCD_Cursor_On: + udelay(150); + BusyCheck(); + LCDWriteInst(0x0F); + break; + + case LCD_Blink_Off: + udelay(150); + BusyCheck(); + LCDWriteInst(0x0E); + break; + + case LCD_Get_Cursor_Pos:{ + struct lcd_display display; + + udelay(150); + BusyCheck(); + display.cursor_address = (LCDReadInst); + display.cursor_address = + (display.cursor_address & 0x07F); + if (copy_to_user + ((struct lcd_display *) arg, &display, + sizeof(struct lcd_display))) + return -EFAULT; + + break; + } + + + case LCD_Set_Cursor_Pos:{ + struct lcd_display display; + + if (copy_from_user + (&display, (struct lcd_display *) arg, + sizeof(struct lcd_display))) + return -EFAULT; + + a = (display.cursor_address | kLCD_Addr); + + udelay(150); + BusyCheck(); + LCDWriteInst(a); + + break; + } + + case LCD_Get_Cursor:{ + struct lcd_display display; + + udelay(150); + BusyCheck(); + display.character = LCDReadData; + + if (copy_to_user + ((struct lcd_display *) arg, &display, + sizeof(struct lcd_display))) + return -EFAULT; + udelay(150); + BusyCheck(); + LCDWriteInst(0x10); + + break; + } + + case LCD_Set_Cursor:{ + struct lcd_display display; + + if (copy_from_user + (&display, (struct lcd_display *) arg, + sizeof(struct lcd_display))) + return -EFAULT; + + udelay(150); + BusyCheck(); + LCDWriteData(display.character); + udelay(150); + BusyCheck(); + LCDWriteInst(0x10); + + break; + } + + + case LCD_Disp_Left: + udelay(150); + BusyCheck(); + LCDWriteInst(0x18); + break; + + case LCD_Disp_Right: + udelay(150); + BusyCheck(); + LCDWriteInst(0x1C); + break; + + case LCD_Home: + udelay(150); + BusyCheck(); + LCDWriteInst(0x02); + break; + + case LCD_Write:{ + struct lcd_display display; + unsigned int index; + + + if (copy_from_user + (&display, (struct lcd_display *) arg, + sizeof(struct lcd_display))) + return -EFAULT; + + udelay(150); + BusyCheck(); + LCDWriteInst(0x80); + udelay(150); + BusyCheck(); + + for (index = 0; index < (display.size1); index++) { + udelay(150); + BusyCheck(); + LCDWriteData(display.line1[index]); + BusyCheck(); + } + + udelay(150); + BusyCheck(); + LCDWriteInst(0xC0); + udelay(150); + BusyCheck(); + for (index = 0; index < (display.size2); index++) { + udelay(150); + BusyCheck(); + LCDWriteData(display.line2[index]); + } + + break; + } + + case LCD_Read:{ + struct lcd_display display; + + BusyCheck(); + for (address = kDD_R00; address <= kDD_R01; + address++) { + a = (address | kLCD_Addr); + + udelay(150); + BusyCheck(); + LCDWriteInst(a); + udelay(150); + BusyCheck(); + display.line1[address] = LCDReadData; + } + + display.line1[0x27] = '\0'; + + for (address = kDD_R10; address <= kDD_R11; + address++) { + a = (address | kLCD_Addr); + + udelay(150); + BusyCheck(); + LCDWriteInst(a); + + udelay(150); + BusyCheck(); + display.line2[address - 0x40] = + LCDReadData; + } + + display.line2[0x27] = '\0'; + + if (copy_to_user + ((struct lcd_display *) arg, &display, + sizeof(struct lcd_display))) + return -EFAULT; + break; + } + +// set all GPIO leds to led_display.leds + + case LED_Set:{ + struct lcd_display led_display; + + + if (copy_from_user + (&led_display, (struct lcd_display *) arg, + sizeof(struct lcd_display))) + return -EFAULT; + + led_state = led_display.leds; + LEDSet(led_state); + + break; + } + + +// set only bit led_display.leds + + case LED_Bit_Set:{ + unsigned int i; + int bit = 1; + struct lcd_display led_display; + + + if (copy_from_user + (&led_display, (struct lcd_display *) arg, + sizeof(struct lcd_display))) + return -EFAULT; + + for (i = 0; i < (int) led_display.leds; i++) { + bit = 2 * bit; + } + + led_state = led_state | bit; + LEDSet(led_state); + break; + } + +// clear only bit led_display.leds + + case LED_Bit_Clear:{ + unsigned int i; + int bit = 1; + struct lcd_display led_display; + + + if (copy_from_user + (&led_display, (struct lcd_display *) arg, + sizeof(struct lcd_display))) + return -EFAULT; + + for (i = 0; i < (int) led_display.leds; i++) { + bit = 2 * bit; + } + + led_state = led_state & ~bit; + LEDSet(led_state); + break; + } + + + case BUTTON_Read:{ + button_display.buttons = GPIRead; + if (copy_to_user + ((struct lcd_display *) arg, &button_display, + sizeof(struct lcd_display))) + return -EFAULT; + break; + } + + case LINK_Check:{ + button_display.buttons = + *((volatile unsigned long *) (0xB0100060)); + if (copy_to_user + ((struct lcd_display *) arg, &button_display, + sizeof(struct lcd_display))) + return -EFAULT; + break; + } + + case LINK_Check_2:{ + int iface_num; + + /* panel-utils should pass in the desired interface status is wanted for + * in "buttons" of the structure. We will set this to non-zero if the + * link is in fact up for the requested interface. --DaveM + */ + if (copy_from_user + (&button_display, (struct lcd_display *) arg, + sizeof(button_display))) + return -EFAULT; + iface_num = button_display.buttons; +#if defined(CONFIG_TULIP) && 0 + if (iface_num >= 0 && + iface_num < MAX_INTERFACES && + linkcheck_callbacks[iface_num] != NULL) { + button_display.buttons = + linkcheck_callbacks[iface_num] + (linkcheck_cookies[iface_num]); + } else +#endif + button_display.buttons = 0; + + if (__copy_to_user + ((struct lcd_display *) arg, &button_display, + sizeof(struct lcd_display))) + return -EFAULT; + break; + } + +// Erase the flash + + case FLASH_Erase:{ + + int ctr = 0; + + if ( !capable(CAP_SYS_ADMIN) ) return -EPERM; + + pr_info(LCD "Erasing Flash\n"); + + // Chip Erase Sequence + WRITE_FLASH(kFlash_Addr1, kFlash_Data1); + WRITE_FLASH(kFlash_Addr2, kFlash_Data2); + WRITE_FLASH(kFlash_Addr1, kFlash_Erase3); + WRITE_FLASH(kFlash_Addr1, kFlash_Data1); + WRITE_FLASH(kFlash_Addr2, kFlash_Data2); + WRITE_FLASH(kFlash_Addr1, kFlash_Erase6); + + while ((!dqpoll(0x00000000, 0xFF)) + && (!timeout(0x00000000))) { + ctr++; + } + + if (READ_FLASH(0x07FFF0) == 0xFF) { + pr_info(LCD "Erase Successful\n"); + } else if (timeout) { + pr_info(LCD "Erase Timed Out\n"); + } + + break; + } + +// burn the flash + + case FLASH_Burn:{ + + volatile unsigned long burn_addr; + unsigned long flags; + unsigned int i, index; + unsigned char *rom; + + + struct lcd_display display; + + if ( !capable(CAP_SYS_ADMIN) ) return -EPERM; + + if (copy_from_user + (&display, (struct lcd_display *) arg, + sizeof(struct lcd_display))) + return -EFAULT; + rom = (unsigned char *) kmalloc((128), GFP_ATOMIC); + if (rom == NULL) { + printk(KERN_ERR LCD "kmalloc() failed in %s\n", + __FUNCTION__); + return -ENOMEM; + } + + pr_info(LCD "Starting Flash burn\n"); + for (i = 0; i < FLASH_SIZE; i = i + 128) { + + if (copy_from_user + (rom, display.RomImage + i, 128)) { + kfree(rom); + return -EFAULT; + } + burn_addr = kFlashBase + i; + spin_lock_irqsave(&lcd_lock, flags); + for (index = 0; index < (128); index++) { + + WRITE_FLASH(kFlash_Addr1, + kFlash_Data1); + WRITE_FLASH(kFlash_Addr2, + kFlash_Data2); + WRITE_FLASH(kFlash_Addr1, + kFlash_Prog); + *((volatile unsigned char *)burn_addr) = + (volatile unsigned char) rom[index]; + + while ((!dqpoll (burn_addr, + (volatile unsigned char) + rom[index])) && + (!timeout(burn_addr))) { } + burn_addr++; + } + spin_unlock_irqrestore(&lcd_lock, flags); + if (* ((volatile unsigned char *) + (burn_addr - 1)) == + (volatile unsigned char) + rom[index - 1]) { + } else if (timeout) { + pr_info(LCD "Flash burn timed out\n"); + } + + + } + kfree(rom); + + pr_info(LCD "Flash successfully burned\n"); + + break; + } + +// read the flash all at once + + case FLASH_Read:{ + + unsigned char *user_bytes; + volatile unsigned long read_addr; + unsigned int i; + + user_bytes = + &(((struct lcd_display *) arg)->RomImage[0]); + + if (!access_ok + (VERIFY_WRITE, user_bytes, FLASH_SIZE)) + return -EFAULT; + + pr_info(LCD "Reading Flash"); + for (i = 0; i < FLASH_SIZE; i++) { + unsigned char tmp_byte; + read_addr = kFlashBase + i; + tmp_byte = + *((volatile unsigned char *) + read_addr); + if (__put_user(tmp_byte, &user_bytes[i])) + return -EFAULT; + } + + + break; + } + + default: + return -EINVAL; + + } + + return 0; + +} + +static int lcd_open(struct inode *inode, struct file *file) +{ + if (!lcd_present) + return -ENXIO; + else + return 0; +} + +/* Only RESET or NEXT counts as button pressed */ + +static inline int button_pressed(void) +{ + unsigned long buttons = GPIRead; + + if ((buttons == BUTTON_Next) || (buttons == BUTTON_Next_B) + || (buttons == BUTTON_Reset_B)) + return buttons; + return 0; +} + +/* LED daemon sits on this and we wake him up once a key is pressed. */ + +static int lcd_waiters = 0; + +static long lcd_read(struct inode *inode, struct file *file, char *buf, + unsigned long count) +{ + long buttons_now; + + if (lcd_waiters > 0) + return -EINVAL; + + lcd_waiters++; + while (((buttons_now = (long) button_pressed()) == 0) && + !(signal_pending(current))) { + msleep_interruptible(2000); + } + lcd_waiters--; + + if (signal_pending(current)) + return -ERESTARTSYS; + return buttons_now; +} + +/* + * The various file operations we support. + */ + +static struct file_operations lcd_fops = { + .read = lcd_read, + .ioctl = lcd_ioctl, + .open = lcd_open, +}; + +static struct miscdevice lcd_dev = { + MISC_DYNAMIC_MINOR, + "lcd", + &lcd_fops +}; + +static int lcd_init(void) +{ + unsigned long data; + + pr_info("%s\n", LCD_DRIVER); + misc_register(&lcd_dev); + + /* Check region? Naaah! Just snarf it up. */ +/* request_region(RTC_PORT(0), RTC_IO_EXTENT, "lcd");*/ + + udelay(150); + data = LCDReadData; + if ((data & 0x000000FF) == (0x00)) { + lcd_present = 0; + pr_info(LCD "LCD Not Present\n"); + } else { + lcd_present = 1; + WRITE_GAL(kGal_DevBank2PReg, kGal_DevBank2Cfg); + WRITE_GAL(kGal_DevBank3PReg, kGal_DevBank3Cfg); + } + + return 0; +} + +static void __exit lcd_exit(void) +{ + misc_deregister(&lcd_dev); +} + +// +// Function: dqpoll +// +// Description: Polls the data lines to see if the flash is busy +// +// In: address, byte data +// +// Out: 0 = busy, 1 = write or erase complete +// +// + +static int dqpoll(volatile unsigned long address, volatile unsigned char data) +{ + volatile unsigned char dq7; + + dq7 = data & 0x80; + + return ((READ_FLASH(address) & 0x80) == dq7); +} + +// +// Function: timeout +// +// Description: Checks to see if erase or write has timed out +// By polling dq5 +// +// In: address +// +// +// Out: 0 = not timed out, 1 = timed out + +static int timeout(volatile unsigned long address) +{ + return (READ_FLASH(address) & 0x20) == 0x20; +} + +module_init(lcd_init); +module_exit(lcd_exit); + +MODULE_AUTHOR("Andrew Bose"); +MODULE_LICENSE("GPL"); |