path: root/recipes/linux/linux-mtx-2-2.4.27/36-sb2-lcd.patch

--- linux-old/arch/mips/au1000/mtx-2/lcd.c	1970-01-01 01:00:00.000000000 +0100
+++ linux/arch/mips/au1000/mtx-2/lcd.c	2006-04-30 19:43:48.070431000 +0200
@@ -0,0 +1,423 @@
+/*
+ * Driver for the KS0713 LCD controller
+ *
+ * Loading the module will cause DEVFS to create the device file /dev/misc/lcd,
+ * which can be written to to control the display.
+ */
+
+#include <linux/lcd-driver.h>
+
+#include <linux/config.h>
+#include <linux/errno.h>
+#include <linux/init.h>
+#include <linux/irq.h>
+#include <linux/kernel.h>
+#include <linux/miscdevice.h>
+#include <linux/module.h>
+#include <linux/poll.h>
+#include <linux/sched.h>
+#include <linux/slab.h>
+#include <linux/timer.h>
+#include <linux/types.h>
+#include <linux/version.h>
+#include <asm/uaccess.h>
+#include <asm/au1000.h>
+
+#include <asm/au1xxx_psc.h>
+
+/*---------[ declarations ]-----------------*/
+
+#if !defined(LCD_PLATFORM)
+#  define LCD_PLATFORM SURFBOX2
+#endif
+
+#define BLA(X) #X
+#define BLA2(X) BLA(X)
+
+static enum lcd_platform lcd_platform = LCD_PLATFORM;
+MODULE_PARM(lcd_platform, "i");
+MODULE_PARM_DESC(lcd_platform, "The platform we are on (default " BLA2(LCD_PLATFORM) ")");
+
+static enum lcd_mode lcd_mode = COMMAND;
+MODULE_PARM(lcd_mode, "i");
+MODULE_PARM_DESC(lcd_mode, "The intial mode (default COMMAND)");
+
+static char lcd_use_dle = 0;
+MODULE_PARM(lcd_use_dle, "b");
+MODULE_PARM_DESC(lcd_use_dle, "Use DLE escapes (default no)");
+
+#define DLE 0x10
+
+static int lcd_minor = -1;
+static char is_inuse = 0;
+
+#define SBOX1_LCD_BACKLIGHT (1<<27) // GPIO27
+#define SBOX2_LCD_BACKLIGHT (1<<14) // GPIO14
+
+#define KS0713_BITMASK (0x1F << 10) /* GPIOs start at GPIO_10 */
+#define SBOX1_BITMASK ((0x1F << 10) | (3 << 25)) /* two GPIO blocks */
+#define SBOX2_BITMASK1  (1) /* GPIO 1 */
+#define SBOX2_BITMASK2 ((1 << 3) | (0x1F << 6)) /* GPIO 2 */
+
+/*---------[ Internal Functions ]-------------*/
+
+/* Layer 0 */
+
+static void set_backlight(const char on)
+{
+  if (lcd_platform == SURFBOX1)
+    au_writel(SBOX1_LCD_BACKLIGHT, on ? SYS_OUTPUTSET : SYS_OUTPUTCLR);
+  else if (lcd_platform == SURFBOX2)
+    au_writel(SBOX2_LCD_BACKLIGHT, on ? SYS_OUTPUTSET : SYS_OUTPUTCLR);
+}
+
+static inline void write_gpio1(const unsigned int line,
+                               const unsigned int mask)
+{
+	const u32 reg = line & mask;
+	const u32 neg = (~reg) & mask;
+	au_writel(neg, SYS_OUTPUTCLR);
+	au_writel(reg, SYS_OUTPUTSET);
+}
+
+static inline void write_gpio2(const unsigned int line,
+                               const unsigned int mask)
+{
+	au_writel((mask&0xffff) << 16 | (line&0xffff), GPIO2_OUTPUT);
+}
+
+static inline void write_flags(const int reset, const int cs, const int rs,
+															 const int clock, const int data)
+{
+	switch (lcd_platform) {
+	case KS0713:
+		write_gpio1((!reset) << 14 | cs << 13 | rs << 12 |
+		            clock << 11 | data << 10, KS0713_BITMASK);
+		break;
+	case SURFBOX1:
+		write_gpio1(rs << 25 | cs << 14 | !cs << 13 | 1 << 12 |
+		            data << 11 | clock << 10, SBOX1_BITMASK);
+		break;
+	case SURFBOX2:
+		write_gpio1(0, SBOX2_BITMASK1);
+		write_gpio2(rs << 3 | cs << 7 | !cs << 6 | 0 << 8 |
+		            data << 9 | clock << 10, SBOX2_BITMASK2);
+		break;
+	}
+}
+
+/* Layer 1 */
+
+static inline void write_line(unsigned int line)
+{
+	if (lcd_platform == KS0713) {
+		write_gpio1(line << 10, KS0713_BITMASK);
+	} else if (lcd_platform == SURFBOX1) {
+		const int hi = line >> 5;
+		line &= 0x1f;
+		write_gpio1(line << 10 | hi << 25, SBOX1_BITMASK | SBOX1_LCD_BACKLIGHT);
+	} else if (lcd_platform == SURFBOX2) {
+		int bm0 = line&1;
+		int bl =  (line>>1)&1;
+		int cd =  (line>>2)&1;
+		int rest = (line>>3)&0x1f;
+		write_gpio1(bm0 | bl<<14, SBOX2_BITMASK1 | SBOX2_LCD_BACKLIGHT);
+		write_gpio2(rest<<6 | cd<<3, SBOX2_BITMASK2);
+	}
+}
+
+static inline void release(void)
+{
+	return write_flags(0, 0, 0, 0, 0);
+}
+
+static inline void reset(void)
+{
+	return write_flags(1, 0, 0, 0, 0);
+}
+
+static void init_gpios(void)
+{
+	switch (lcd_platform) {
+	case KS0713:
+		// TODO: init lines?
+		release();
+		break;
+	case SURFBOX1:
+		if (lcd_mode == I2C)
+			write_gpio1(1 << 26 | 1 << 12 | 1 << 11 | 1 << 10, SBOX1_BITMASK);
+		else
+			release();
+		break;
+	case SURFBOX2:
+		au_writel(au_readl(GPIO2_DIR) | SBOX2_BITMASK2, GPIO2_DIR);
+		// au_writel(PSC_SEL_PS_DISABLED, PSC2_BASE_ADDR + PSC_CTRL_OFFSET);
+		au_writel(au_readl(SYS_PINFUNC) | SYS_PF_PSC2_GPIO, SYS_PINFUNC);
+		release();
+		break;
+	}
+}
+
+static inline void write_bit(const int rs, const int bit)
+{
+	/* Data is read on the rising edge */
+	write_flags(0, 1, rs, 0, bit);
+	write_flags(0, 1, rs, 1, bit);
+	if (lcd_platform != KS0713 && rs == LCD_RS_DATA) {
+		write_flags(0, 1, rs, 0, bit);
+		write_flags(0, 1, rs, 1, bit);
+	}
+}
+
+/* Layer 2 */
+
+static inline void write_byte(const int rs, const int byte)
+{
+	int i;
+	for (i = 7; i >= 0; i--)
+		write_bit(rs, (byte >> i) & 1);
+}
+
+DECLARE_WAIT_QUEUE_HEAD(lcd_sleep_q);
+
+static inline void sleep (long jiff)
+{
+	const long j = jiffies + jiff;
+	while (jiffies < j)
+		interruptible_sleep_on_timeout(&lcd_sleep_q, j - jiffies);
+}
+
+static inline void ctrl_init(void)
+{
+	switch (lcd_platform) {
+	case KS0713:
+		reset();
+		sleep(1L);
+		release();
+		sleep(1L);
+		// TODO: write_byte (LCD_RS_COMMAND, cmd|arg)
+/* 	do_command(fd, LCD_CMD_DISPSTART, 0, 0); */
+/* 	do_command(fd, LCD_CMD_DISPONOFF, 1, 0); */
+/* 	do_command(fd, LCD_CMD_ENTIREDISP, 0, 0); */
+/* 	do_command(fd, LCD_CMD_SHLSELECT, 0, 0); */
+/* 	do_command(fd, LCD_CMD_ADCSELECT, 1, 0); */
+/* 	do_command(fd, LCD_CMD_REFVOLTMODE, 0, 0); */
+/* 	do_command(fd, 0, 40, 0); */
+/* 	do_command(fd, LCD_CMD_LCDBIAS, 1, 0); */
+/* 	do_command(fd, LCD_CMD_POWERCTRL, 7, 0); */
+/* 	do_command(fd, LCD_CMD_REGRESISTOR, 6, 1); */
+		release();
+		sleep(1L);
+		break;
+	case SURFBOX1:
+	case SURFBOX2:
+		write_byte (LCD_RS_COMMAND, 0xe2); // RESET
+		release();
+		sleep(1L);
+		write_byte (LCD_RS_COMMAND, 0x81); // Vbias potentiometer
+		write_byte (LCD_RS_COMMAND, 0x1c); // set to 28 (conf?)
+		write_byte (LCD_RS_COMMAND, 0xad); // ON, b/w
+		release();
+		set_backlight(1);
+		break;
+	}
+}
+
+/* Layer i */
+
+static int dle = 0;
+
+static inline void handle_input (const unsigned char byte)
+{
+	if (dle) {
+		switch (byte) {
+		case DLE:
+			write_line (DLE);
+			break;
+		case 'B': /* backlight on */
+			set_backlight(1);
+			break;
+		case 'b': /* backlight off */
+			set_backlight(0);
+			break;
+		case 'r': /* reset */
+			reset();
+			break;
+		case 'l': /* release */
+			release();
+			break;
+		case 'i': /* init */
+			ctrl_init();
+			break;
+		case 's': /* serial mode */
+			lcd_mode = SERIAL;
+			break;
+		case 'c': /* command mode */
+			lcd_mode = COMMAND;
+			break;
+		case 'd': /* data mode */
+			lcd_mode = DATA;
+			break;
+		case '3': /* select mode by number */
+		case '2':
+		case '1':
+		case '0':
+			lcd_mode = (enum lcd_mode) (byte - '0');
+			break;
+		case 'e': /* stop dle mode, reversable by ioctl only */
+			lcd_use_dle = 0;
+			break;
+		}
+		dle = 0;
+	} else if (lcd_use_dle && byte == DLE) {
+		dle = 1;
+	} else switch (lcd_mode) {
+	case COMMAND:
+		write_byte (LCD_RS_COMMAND, byte);
+		break;
+	case DATA:
+		write_byte (LCD_RS_DATA, byte);
+		break;
+	case SERIAL:
+	case I2C:
+		write_line (byte);
+		break;
+	}
+}
+
+/*---------[ File Functions ]-----------------*/
+
+static int lcd_open (struct inode *inode, struct file *file)
+{
+	if (MINOR(inode->i_rdev) != lcd_minor)
+		return -ENODEV;
+	if (is_inuse)
+		return -EBUSY;
+	is_inuse = 1;
+	MOD_INC_USE_COUNT;
+	return 0;
+}
+
+static int lcd_release (struct inode *inode, struct file *file)
+{
+	if (MINOR(inode->i_rdev) == lcd_minor) {
+		is_inuse = 0;
+	}
+	MOD_DEC_USE_COUNT;
+	return 0;
+}
+
+static ssize_t lcd_write (struct file *file, const char *buf,
+                          size_t count, loff_t *ppos)
+{
+	unsigned char localbuf;
+	ssize_t bytes_read = 0;
+	while (bytes_read < count) {
+		if (copy_from_user(&localbuf, buf + bytes_read, 1))
+			return -EFAULT;
+		++bytes_read;
+		handle_input(localbuf);
+	}
+	return bytes_read; /* Everything read */
+}
+
+static int lcd_ioctl (struct inode *inode, struct file *file,
+                      unsigned int cmd, unsigned long arg)
+{
+	switch (cmd) {
+	case LCD_IOCRESET:
+		reset();
+		break;
+	case LCD_IOCRELEASE:
+		release ();
+		break;
+	case LCD_IOCSMODE:
+		lcd_mode = (enum lcd_mode) arg;
+		break;
+	case LCD_IOCGMODE:
+		return __put_user(lcd_mode, (enum lcd_mode *) arg);
+	case LCD_IOCSUSEDLE:
+		lcd_use_dle = (char) arg;
+		break;
+	case LCD_IOCGUSEDLE:
+		return __put_user(lcd_use_dle, (char *) arg);
+	case LCD_IOCCOMMAND:
+		write_byte (LCD_RS_COMMAND, arg);
+		break;
+	case LCD_IOCINIT:
+		ctrl_init();
+		break;
+	case LCD_IOCSBACKLIGHT:
+	  set_backlight((char) arg);
+	  break;
+	case LCD_IOCGPLATFORM:
+		return __put_user(lcd_platform, (enum lcd_platform *) arg);
+		break;
+
+	default:
+		return -ENOTTY; /* sic! "inappropiate ioctl for device" */
+	}
+	return 0;
+}
+
+/*---------[ Module stuff ]-----------------*/
+
+static struct file_operations lcd_fops = {
+	.owner = THIS_MODULE,
+	.llseek = NULL,
+	.read = NULL,
+	.write = lcd_write,
+	.readdir = NULL,
+	.poll = NULL,
+	.ioctl = lcd_ioctl,
+	.mmap = NULL,
+	.open = lcd_open,
+	.flush = NULL,
+	.release = lcd_release
+};
+
+static struct miscdevice lcd_miscdev = {
+	MISC_DYNAMIC_MINOR,
+	"lcd",
+	&lcd_fops
+};
+
+int __init lcd_init (void)
+{
+	is_inuse = 1;
+	printk(KERN_INFO "Surfbox2 LCD driver ...");
+
+	init_gpios();
+	//au_writel( 0x12000000 & LCD_BITMASK, SYS_OUTPUTCLR );
+	//au_writel( 0x0c000000, SYS_OUTPUTSET ); /* Magic GPIO to activate LED-driver */
+
+	/* Register device */
+	if (misc_register(&lcd_miscdev) >= 0) {
+		lcd_minor = lcd_miscdev.minor;
+		printk(" successfully loaded (platform=%d,mode=%d,dle=%d).\n",
+					 lcd_platform, lcd_mode, lcd_use_dle);
+		is_inuse = 0;
+		return 0;
+	} else {
+		printk("failed.\n");
+		is_inuse = 0;
+		return 1;
+	}
+}
+
+void __exit lcd_cleanup (void)
+{
+	is_inuse = 1;
+	misc_deregister(&lcd_miscdev);
+	printk(KERN_INFO "Surfbox (%d) LCD driver unloaded (mode=%d,dle=%d).\n",
+				 lcd_platform, lcd_mode, lcd_use_dle);
+	is_inuse = 0;
+}
+
+module_init(lcd_init);
+module_exit(lcd_cleanup);
+
+MODULE_AUTHOR("Simon Krahnke");
+MODULE_DESCRIPTION("Driver for MTX LCD");
+MODULE_LICENSE("GPL");
+EXPORT_NO_SYMBOLS;
--- linux-old/include/linux/lcd-driver.h	1970-01-01 01:00:00.000000000 +0100
+++ linux/include/linux/lcd-driver.h	2006-04-30 19:44:02.035303750 +0200
@@ -0,0 +1,26 @@
+#if !defined(LCD_DRIVER_H)
+#define LCD_DRIVER_H
+
+enum lcd_platform { KS0713 = 0, SURFBOX1, SURFBOX2 };
+
+enum lcd_mode { SERIAL = 0, COMMAND, DATA, I2C };
+
+#define LCD_RS_COMMAND 0
+#define LCD_RS_DATA 1
+
+/* We use the available magic L with number 0x40-0x4f */
+
+#define LCD_IOC_MAGIC 'L'
+
+#define LCD_IOCRESET   _IO(LCD_IOC_MAGIC, 0x40)
+#define LCD_IOCRELEASE _IO(LCD_IOC_MAGIC, 0x41)
+#define LCD_IOCSMODE    _IOW(LCD_IOC_MAGIC, 0x42, enum lcd_mode)
+#define LCD_IOCGMODE    _IOR(LCD_IOC_MAGIC, 0x43, enum lcd_mode*)
+#define LCD_IOCSUSEDLE  _IOW(LCD_IOC_MAGIC, 0x44, char)
+#define LCD_IOCGUSEDLE  _IOR(LCD_IOC_MAGIC, 0x45, char*)
+#define LCD_IOCCOMMAND _IOW(LCD_IOC_MAGIC, 0x46, unsigned char)
+#define LCD_IOCINIT    _IO(LCD_IOC_MAGIC, 0x47)
+#define LCD_IOCSBACKLIGHT  _IOW(LCD_IOC_MAGIC, 0x48, char)
+#define LCD_IOCGPLATFORM _IOR(LCD_IOC_MAGIC, 0x49, enum lcd_platform*)
+
+#endif /* LCD_DRIVER_H */
--- linux/arch/mips/au1000/mtx-2/Makefile.org	2006-05-01 13:36:01.675030000 +0200
+++ linux/arch/mips/au1000/mtx-2/Makefile	2006-05-01 13:36:11.175623750 +0200
@@ -15,6 +15,6 @@
 
 O_TARGET := mtx-2.o
 
-obj-y := init.o board_setup.o irqmap.o slic.o
+obj-y := init.o board_setup.o irqmap.o slic.o lcd.o
 
 include $(TOPDIR)/Rules.make