mirror of https://gitee.com/openkylin/linux.git
416 lines
8.6 KiB
C
416 lines
8.6 KiB
C
/*
|
|
* Cobalt/SEAD3 LCD frame buffer driver.
|
|
*
|
|
* Copyright (C) 2008 Yoichi Yuasa <yuasa@linux-mips.org>
|
|
* Copyright (C) 2012 MIPS Technologies, Inc.
|
|
*
|
|
* This program is free software; you can redistribute it and/or modify
|
|
* it under the terms of the GNU General Public License as published by
|
|
* the Free Software Foundation; either version 2 of the License, or
|
|
* (at your option) any later version.
|
|
*
|
|
* This program is distributed in the hope that it will be useful,
|
|
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
* GNU General Public License for more details.
|
|
*
|
|
* You should have received a copy of the GNU General Public License
|
|
* along with this program; if not, write to the Free Software
|
|
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
|
|
*/
|
|
#include <linux/delay.h>
|
|
#include <linux/fb.h>
|
|
#include <linux/init.h>
|
|
#include <linux/io.h>
|
|
#include <linux/ioport.h>
|
|
#include <linux/uaccess.h>
|
|
#include <linux/platform_device.h>
|
|
#include <linux/module.h>
|
|
|
|
/*
|
|
* Cursor position address
|
|
* \X 0 1 2 ... 14 15
|
|
* Y+----+----+----+---+----+----+
|
|
* 0|0x00|0x01|0x02|...|0x0e|0x0f|
|
|
* +----+----+----+---+----+----+
|
|
* 1|0x40|0x41|0x42|...|0x4e|0x4f|
|
|
* +----+----+----+---+----+----+
|
|
*/
|
|
#define LCD_DATA_REG_OFFSET 0x10
|
|
#define LCD_XRES_MAX 16
|
|
#define LCD_YRES_MAX 2
|
|
#define LCD_CHARS_MAX 32
|
|
|
|
#define LCD_CLEAR 0x01
|
|
#define LCD_CURSOR_MOVE_HOME 0x02
|
|
#define LCD_RESET 0x06
|
|
#define LCD_OFF 0x08
|
|
#define LCD_CURSOR_OFF 0x0c
|
|
#define LCD_CURSOR_BLINK_OFF 0x0e
|
|
#define LCD_CURSOR_ON 0x0f
|
|
#define LCD_ON LCD_CURSOR_ON
|
|
#define LCD_CURSOR_MOVE_LEFT 0x10
|
|
#define LCD_CURSOR_MOVE_RIGHT 0x14
|
|
#define LCD_DISPLAY_LEFT 0x18
|
|
#define LCD_DISPLAY_RIGHT 0x1c
|
|
#define LCD_PRERESET 0x3f /* execute 4 times continuously */
|
|
#define LCD_BUSY 0x80
|
|
|
|
#define LCD_GRAPHIC_MODE 0x40
|
|
#define LCD_TEXT_MODE 0x80
|
|
#define LCD_CUR_POS_MASK 0x7f
|
|
|
|
#define LCD_CUR_POS(x) ((x) & LCD_CUR_POS_MASK)
|
|
#define LCD_TEXT_POS(x) ((x) | LCD_TEXT_MODE)
|
|
|
|
#ifdef CONFIG_MIPS_COBALT
|
|
static inline void lcd_write_control(struct fb_info *info, u8 control)
|
|
{
|
|
writel((u32)control << 24, info->screen_base);
|
|
}
|
|
|
|
static inline u8 lcd_read_control(struct fb_info *info)
|
|
{
|
|
return readl(info->screen_base) >> 24;
|
|
}
|
|
|
|
static inline void lcd_write_data(struct fb_info *info, u8 data)
|
|
{
|
|
writel((u32)data << 24, info->screen_base + LCD_DATA_REG_OFFSET);
|
|
}
|
|
|
|
static inline u8 lcd_read_data(struct fb_info *info)
|
|
{
|
|
return readl(info->screen_base + LCD_DATA_REG_OFFSET) >> 24;
|
|
}
|
|
#else
|
|
|
|
#define LCD_CTL 0x00
|
|
#define LCD_DATA 0x08
|
|
#define CPLD_STATUS 0x10
|
|
#define CPLD_DATA 0x18
|
|
|
|
static inline void cpld_wait(struct fb_info *info)
|
|
{
|
|
do {
|
|
} while (readl(info->screen_base + CPLD_STATUS) & 1);
|
|
}
|
|
|
|
static inline void lcd_write_control(struct fb_info *info, u8 control)
|
|
{
|
|
cpld_wait(info);
|
|
writel(control, info->screen_base + LCD_CTL);
|
|
}
|
|
|
|
static inline u8 lcd_read_control(struct fb_info *info)
|
|
{
|
|
cpld_wait(info);
|
|
readl(info->screen_base + LCD_CTL);
|
|
cpld_wait(info);
|
|
return readl(info->screen_base + CPLD_DATA) & 0xff;
|
|
}
|
|
|
|
static inline void lcd_write_data(struct fb_info *info, u8 data)
|
|
{
|
|
cpld_wait(info);
|
|
writel(data, info->screen_base + LCD_DATA);
|
|
}
|
|
|
|
static inline u8 lcd_read_data(struct fb_info *info)
|
|
{
|
|
cpld_wait(info);
|
|
readl(info->screen_base + LCD_DATA);
|
|
cpld_wait(info);
|
|
return readl(info->screen_base + CPLD_DATA) & 0xff;
|
|
}
|
|
#endif
|
|
|
|
static int lcd_busy_wait(struct fb_info *info)
|
|
{
|
|
u8 val = 0;
|
|
int timeout = 10, retval = 0;
|
|
|
|
do {
|
|
val = lcd_read_control(info);
|
|
val &= LCD_BUSY;
|
|
if (val != LCD_BUSY)
|
|
break;
|
|
|
|
if (msleep_interruptible(1))
|
|
return -EINTR;
|
|
|
|
timeout--;
|
|
} while (timeout);
|
|
|
|
if (val == LCD_BUSY)
|
|
retval = -EBUSY;
|
|
|
|
return retval;
|
|
}
|
|
|
|
static void lcd_clear(struct fb_info *info)
|
|
{
|
|
int i;
|
|
|
|
for (i = 0; i < 4; i++) {
|
|
udelay(150);
|
|
|
|
lcd_write_control(info, LCD_PRERESET);
|
|
}
|
|
|
|
udelay(150);
|
|
|
|
lcd_write_control(info, LCD_CLEAR);
|
|
|
|
udelay(150);
|
|
|
|
lcd_write_control(info, LCD_RESET);
|
|
}
|
|
|
|
static struct fb_fix_screeninfo cobalt_lcdfb_fix __devinitdata = {
|
|
.id = "cobalt-lcd",
|
|
.type = FB_TYPE_TEXT,
|
|
.type_aux = FB_AUX_TEXT_MDA,
|
|
.visual = FB_VISUAL_MONO01,
|
|
.line_length = LCD_XRES_MAX,
|
|
.accel = FB_ACCEL_NONE,
|
|
};
|
|
|
|
static ssize_t cobalt_lcdfb_read(struct fb_info *info, char __user *buf,
|
|
size_t count, loff_t *ppos)
|
|
{
|
|
char src[LCD_CHARS_MAX];
|
|
unsigned long pos;
|
|
int len, retval = 0;
|
|
|
|
pos = *ppos;
|
|
if (pos >= LCD_CHARS_MAX || count == 0)
|
|
return 0;
|
|
|
|
if (count > LCD_CHARS_MAX)
|
|
count = LCD_CHARS_MAX;
|
|
|
|
if (pos + count > LCD_CHARS_MAX)
|
|
count = LCD_CHARS_MAX - pos;
|
|
|
|
for (len = 0; len < count; len++) {
|
|
retval = lcd_busy_wait(info);
|
|
if (retval < 0)
|
|
break;
|
|
|
|
lcd_write_control(info, LCD_TEXT_POS(pos));
|
|
|
|
retval = lcd_busy_wait(info);
|
|
if (retval < 0)
|
|
break;
|
|
|
|
src[len] = lcd_read_data(info);
|
|
if (pos == 0x0f)
|
|
pos = 0x40;
|
|
else
|
|
pos++;
|
|
}
|
|
|
|
if (retval < 0 && signal_pending(current))
|
|
return -ERESTARTSYS;
|
|
|
|
if (copy_to_user(buf, src, len))
|
|
return -EFAULT;
|
|
|
|
*ppos += len;
|
|
|
|
return len;
|
|
}
|
|
|
|
static ssize_t cobalt_lcdfb_write(struct fb_info *info, const char __user *buf,
|
|
size_t count, loff_t *ppos)
|
|
{
|
|
char dst[LCD_CHARS_MAX];
|
|
unsigned long pos;
|
|
int len, retval = 0;
|
|
|
|
pos = *ppos;
|
|
if (pos >= LCD_CHARS_MAX || count == 0)
|
|
return 0;
|
|
|
|
if (count > LCD_CHARS_MAX)
|
|
count = LCD_CHARS_MAX;
|
|
|
|
if (pos + count > LCD_CHARS_MAX)
|
|
count = LCD_CHARS_MAX - pos;
|
|
|
|
if (copy_from_user(dst, buf, count))
|
|
return -EFAULT;
|
|
|
|
for (len = 0; len < count; len++) {
|
|
retval = lcd_busy_wait(info);
|
|
if (retval < 0)
|
|
break;
|
|
|
|
lcd_write_control(info, LCD_TEXT_POS(pos));
|
|
|
|
retval = lcd_busy_wait(info);
|
|
if (retval < 0)
|
|
break;
|
|
|
|
lcd_write_data(info, dst[len]);
|
|
if (pos == 0x0f)
|
|
pos = 0x40;
|
|
else
|
|
pos++;
|
|
}
|
|
|
|
if (retval < 0 && signal_pending(current))
|
|
return -ERESTARTSYS;
|
|
|
|
*ppos += len;
|
|
|
|
return len;
|
|
}
|
|
|
|
static int cobalt_lcdfb_blank(int blank_mode, struct fb_info *info)
|
|
{
|
|
int retval;
|
|
|
|
retval = lcd_busy_wait(info);
|
|
if (retval < 0)
|
|
return retval;
|
|
|
|
switch (blank_mode) {
|
|
case FB_BLANK_UNBLANK:
|
|
lcd_write_control(info, LCD_ON);
|
|
break;
|
|
default:
|
|
lcd_write_control(info, LCD_OFF);
|
|
break;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int cobalt_lcdfb_cursor(struct fb_info *info, struct fb_cursor *cursor)
|
|
{
|
|
u32 x, y;
|
|
int retval;
|
|
|
|
switch (cursor->set) {
|
|
case FB_CUR_SETPOS:
|
|
x = cursor->image.dx;
|
|
y = cursor->image.dy;
|
|
if (x >= LCD_XRES_MAX || y >= LCD_YRES_MAX)
|
|
return -EINVAL;
|
|
|
|
retval = lcd_busy_wait(info);
|
|
if (retval < 0)
|
|
return retval;
|
|
|
|
lcd_write_control(info,
|
|
LCD_TEXT_POS(info->fix.line_length * y + x));
|
|
break;
|
|
default:
|
|
return -EINVAL;
|
|
}
|
|
|
|
retval = lcd_busy_wait(info);
|
|
if (retval < 0)
|
|
return retval;
|
|
|
|
if (cursor->enable)
|
|
lcd_write_control(info, LCD_CURSOR_ON);
|
|
else
|
|
lcd_write_control(info, LCD_CURSOR_OFF);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static struct fb_ops cobalt_lcd_fbops = {
|
|
.owner = THIS_MODULE,
|
|
.fb_read = cobalt_lcdfb_read,
|
|
.fb_write = cobalt_lcdfb_write,
|
|
.fb_blank = cobalt_lcdfb_blank,
|
|
.fb_cursor = cobalt_lcdfb_cursor,
|
|
};
|
|
|
|
static int __devinit cobalt_lcdfb_probe(struct platform_device *dev)
|
|
{
|
|
struct fb_info *info;
|
|
struct resource *res;
|
|
int retval;
|
|
|
|
info = framebuffer_alloc(0, &dev->dev);
|
|
if (!info)
|
|
return -ENOMEM;
|
|
|
|
res = platform_get_resource(dev, IORESOURCE_MEM, 0);
|
|
if (!res) {
|
|
framebuffer_release(info);
|
|
return -EBUSY;
|
|
}
|
|
|
|
info->screen_size = resource_size(res);
|
|
info->screen_base = ioremap(res->start, info->screen_size);
|
|
info->fbops = &cobalt_lcd_fbops;
|
|
info->fix = cobalt_lcdfb_fix;
|
|
info->fix.smem_start = res->start;
|
|
info->fix.smem_len = info->screen_size;
|
|
info->pseudo_palette = NULL;
|
|
info->par = NULL;
|
|
info->flags = FBINFO_DEFAULT;
|
|
|
|
retval = register_framebuffer(info);
|
|
if (retval < 0) {
|
|
iounmap(info->screen_base);
|
|
framebuffer_release(info);
|
|
return retval;
|
|
}
|
|
|
|
platform_set_drvdata(dev, info);
|
|
|
|
lcd_clear(info);
|
|
|
|
printk(KERN_INFO "fb%d: Cobalt server LCD frame buffer device\n",
|
|
info->node);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int __devexit cobalt_lcdfb_remove(struct platform_device *dev)
|
|
{
|
|
struct fb_info *info;
|
|
|
|
info = platform_get_drvdata(dev);
|
|
if (info) {
|
|
iounmap(info->screen_base);
|
|
unregister_framebuffer(info);
|
|
framebuffer_release(info);
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static struct platform_driver cobalt_lcdfb_driver = {
|
|
.probe = cobalt_lcdfb_probe,
|
|
.remove = __devexit_p(cobalt_lcdfb_remove),
|
|
.driver = {
|
|
.name = "cobalt-lcd",
|
|
.owner = THIS_MODULE,
|
|
},
|
|
};
|
|
|
|
static int __init cobalt_lcdfb_init(void)
|
|
{
|
|
return platform_driver_register(&cobalt_lcdfb_driver);
|
|
}
|
|
|
|
static void __exit cobalt_lcdfb_exit(void)
|
|
{
|
|
platform_driver_unregister(&cobalt_lcdfb_driver);
|
|
}
|
|
|
|
module_init(cobalt_lcdfb_init);
|
|
module_exit(cobalt_lcdfb_exit);
|
|
|
|
MODULE_LICENSE("GPL v2");
|
|
MODULE_AUTHOR("Yoichi Yuasa");
|
|
MODULE_DESCRIPTION("Cobalt server LCD frame buffer driver");
|