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iPod greyscale LCD driver: * Further speedup (timeout check turned out to be unnecessary, as well as setting the LCD control register every time on Mini G2. Put lcd_write_data() in IRAM on PP5002). * Better blacklevel stability on 1st...3rd gen. * lcd_enable() function in preparation for suspend on 1st/2nd gen, and shutdown without a black line remaining.

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git-svn-id: svn://svn.rockbox.org/rockbox/trunk@14264 a1c6a512-1295-4272-9138-f99709370657
This commit is contained in:
Jens Arnold 2007-08-10 08:09:53 +00:00
parent e62040d5ed
commit 97bdfce5b6
1 changed files with 74 additions and 10 deletions
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84
firmware/target/arm/ipod/lcd-gray.c
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@ -28,6 +28,7 @@
#include "lcd.h"
#include "kernel.h"
#include "system.h"
#include "hwcompat.h"
/*** hardware configuration ***/
@ -68,6 +69,20 @@ static bool lcd_backlit = false;
static void invert_display(void);
#endif
#if defined(IPOD_1G2G) || defined(IPOD_3G)
static unsigned short power_reg_h;
#define POWER_REG_H power_reg_h
#else
#define POWER_REG_H 0x1200
#endif
#ifdef IPOD_1G2G
static unsigned short contrast_reg_h;
#define CONTRAST_REG_H contrast_reg_h
#else
#define CONTRAST_REG_H 0x400
#endif
/* needed for flip */
static int addr_offset;
#if defined(IPOD_MINI) || defined(IPOD_MINI2G)
@ -82,19 +97,18 @@ static const unsigned char dibits[16] ICONST_ATTR = {
/* wait for LCD with timeout */
static inline void lcd_wait_write(void)
{
long timeout = USEC_TIMER + 1000; /* 1 ms */
while ((inl(IPOD_LCD_BASE) & LCD_BUSY_MASK)
&& TIME_BEFORE(USEC_TIMER, timeout));
while (inl(IPOD_LCD_BASE) & LCD_BUSY_MASK);
}
/* send LCD data */
#if CONFIG_CPU == PP5002
STATICIRAM void ICODE_ATTR lcd_send_data(unsigned data)
#else
static void lcd_send_data(unsigned data)
#endif
{
lcd_wait_write();
#ifdef IPOD_MINI2G
outl((inl(IPOD_LCD_BASE) & ~0x1f00000) | 0x1700000, IPOD_LCD_BASE);
outl(data | 0x760000, IPOD_LCD_BASE+8);
#else
outl(data >> 8, IPOD_LCD_BASE + LCD_DATA);
@ -108,7 +122,6 @@ static void lcd_prepare_cmd(unsigned cmd)
{
lcd_wait_write();
#ifdef IPOD_MINI2G
outl((inl(IPOD_LCD_BASE) & ~0x1f00000) | 0x1700000, IPOD_LCD_BASE);
outl(cmd | 0x740000, IPOD_LCD_BASE+8);
#else
outl(0x0, IPOD_LCD_BASE + LCD_CMD);
@ -127,6 +140,38 @@ static void lcd_cmd_and_data(unsigned cmd, unsigned data)
/* LCD init */
void lcd_init_device(void)
{
#ifdef IPOD_1G2G
if ((IPOD_HW_REVISION >> 16) == 1)
{
power_reg_h = 0x1500;
contrast_reg_h = 0x700;
}
else /* 2nd gen */
{
if (inl(0xcf00404c) & 0x01) /* check bit 0 */
{
power_reg_h = 0x1520; /* Set step-up frequency to f/8 instead of
* f/32, for better blacklevel stability */
contrast_reg_h = 0x400;
}
else
{
power_reg_h = 0x1100;
contrast_reg_h = 0x300;
}
}
#elif defined IPOD_3G
if (inl(0xcf00404c) & 0x01) /* check bit 0 */
power_reg_h = 0x1520; /* Set step-up frequency to f/8 instead of
* f/32, for better blacklevel stability */
else
power_reg_h = 0x1100;
#elif defined IPOD_MINI2G
lcd_wait_write();
outl((inl(IPOD_LCD_BASE) & ~0x1f00000) | 0x1700000, IPOD_LCD_BASE);
#endif
lcd_cmd_and_data(R_POWER_CONTROL, POWER_REG_H | 0xc);
#ifdef HAVE_BACKLIGHT_INVERSION
invert_display();
#else
@ -150,10 +195,10 @@ void lcd_init_device(void)
int lcd_default_contrast(void)
{
#ifdef IPOD_1G2G
return 30;
return 28;
#elif defined(IPOD_MINI) || defined(IPOD_MINI2G) || defined(IPOD_3G)
return 42;
#else
#elif defined(IPOD_4G)
return 35;
#endif
}
@ -164,7 +209,7 @@ void lcd_set_contrast(int val)
if (val < 0) val = 0;
else if (val > 63) val = 63;
lcd_cmd_and_data(R_CONTRAST_CONTROL, 0x400 | (val + 64));
lcd_cmd_and_data(R_CONTRAST_CONTROL, CONTRAST_REG_H | (val + 64));
}
#ifdef HAVE_BACKLIGHT_INVERSION
@ -229,6 +274,25 @@ void lcd_set_flip(bool yesno)
#endif
}
void lcd_enable(bool on)
{
if (on)
{
lcd_cmd_and_data(R_START_OSC, 1); /* start oscillation */
sleep(HZ/10); /* wait 10ms */
lcd_cmd_and_data(R_POWER_CONTROL, POWER_REG_H); /*clear standby mode */
lcd_cmd_and_data(R_POWER_CONTROL, POWER_REG_H | 0xc);
/* enable opamp & booster */
}
else
{
lcd_cmd_and_data(R_POWER_CONTROL, POWER_REG_H);
/* switch off opamp & booster */
lcd_cmd_and_data(R_POWER_CONTROL, POWER_REG_H | 0x1);
/* enter standby mode */
}
}
/*** update functions ***/
/* Performance function that works with an external buffer