352 lines
6.9 KiB
C
352 lines
6.9 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
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/*
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* Cobalt/SEAD3 LCD frame buffer driver.
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*
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* Copyright (C) 2008 Yoichi Yuasa <yuasa@linux-mips.org>
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* Copyright (C) 2012 MIPS Technologies, Inc.
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*/
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#include <linux/delay.h>
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#include <linux/fb.h>
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#include <linux/init.h>
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#include <linux/io.h>
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#include <linux/ioport.h>
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#include <linux/uaccess.h>
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#include <linux/platform_device.h>
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#include <linux/module.h>
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#include <linux/sched/signal.h>
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/*
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* Cursor position address
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* \X 0 1 2 ... 14 15
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* Y+----+----+----+---+----+----+
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* 0|0x00|0x01|0x02|...|0x0e|0x0f|
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* +----+----+----+---+----+----+
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* 1|0x40|0x41|0x42|...|0x4e|0x4f|
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* +----+----+----+---+----+----+
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*/
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#define LCD_DATA_REG_OFFSET 0x10
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#define LCD_XRES_MAX 16
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#define LCD_YRES_MAX 2
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#define LCD_CHARS_MAX 32
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#define LCD_CLEAR 0x01
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#define LCD_CURSOR_MOVE_HOME 0x02
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#define LCD_RESET 0x06
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#define LCD_OFF 0x08
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#define LCD_CURSOR_OFF 0x0c
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#define LCD_CURSOR_BLINK_OFF 0x0e
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#define LCD_CURSOR_ON 0x0f
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#define LCD_ON LCD_CURSOR_ON
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#define LCD_CURSOR_MOVE_LEFT 0x10
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#define LCD_CURSOR_MOVE_RIGHT 0x14
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#define LCD_DISPLAY_LEFT 0x18
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#define LCD_DISPLAY_RIGHT 0x1c
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#define LCD_PRERESET 0x3f /* execute 4 times continuously */
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#define LCD_BUSY 0x80
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#define LCD_GRAPHIC_MODE 0x40
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#define LCD_TEXT_MODE 0x80
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#define LCD_CUR_POS_MASK 0x7f
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#define LCD_CUR_POS(x) ((x) & LCD_CUR_POS_MASK)
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#define LCD_TEXT_POS(x) ((x) | LCD_TEXT_MODE)
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static inline void lcd_write_control(struct fb_info *info, u8 control)
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{
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writel((u32)control << 24, info->screen_base);
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}
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static inline u8 lcd_read_control(struct fb_info *info)
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{
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return readl(info->screen_base) >> 24;
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}
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static inline void lcd_write_data(struct fb_info *info, u8 data)
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{
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writel((u32)data << 24, info->screen_base + LCD_DATA_REG_OFFSET);
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}
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static inline u8 lcd_read_data(struct fb_info *info)
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{
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return readl(info->screen_base + LCD_DATA_REG_OFFSET) >> 24;
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}
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static int lcd_busy_wait(struct fb_info *info)
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{
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u8 val = 0;
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int timeout = 10, retval = 0;
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do {
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val = lcd_read_control(info);
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val &= LCD_BUSY;
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if (val != LCD_BUSY)
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break;
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if (msleep_interruptible(1))
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return -EINTR;
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timeout--;
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} while (timeout);
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if (val == LCD_BUSY)
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retval = -EBUSY;
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return retval;
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}
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static void lcd_clear(struct fb_info *info)
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{
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int i;
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for (i = 0; i < 4; i++) {
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udelay(150);
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lcd_write_control(info, LCD_PRERESET);
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}
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udelay(150);
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lcd_write_control(info, LCD_CLEAR);
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udelay(150);
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lcd_write_control(info, LCD_RESET);
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}
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static const struct fb_fix_screeninfo cobalt_lcdfb_fix = {
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.id = "cobalt-lcd",
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.type = FB_TYPE_TEXT,
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.type_aux = FB_AUX_TEXT_MDA,
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.visual = FB_VISUAL_MONO01,
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.line_length = LCD_XRES_MAX,
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.accel = FB_ACCEL_NONE,
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};
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static ssize_t cobalt_lcdfb_read(struct fb_info *info, char __user *buf,
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size_t count, loff_t *ppos)
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{
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char src[LCD_CHARS_MAX];
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unsigned long pos;
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int len, retval = 0;
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pos = *ppos;
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if (pos >= LCD_CHARS_MAX || count == 0)
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return 0;
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if (count > LCD_CHARS_MAX)
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count = LCD_CHARS_MAX;
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if (pos + count > LCD_CHARS_MAX)
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count = LCD_CHARS_MAX - pos;
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for (len = 0; len < count; len++) {
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retval = lcd_busy_wait(info);
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if (retval < 0)
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break;
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lcd_write_control(info, LCD_TEXT_POS(pos));
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retval = lcd_busy_wait(info);
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if (retval < 0)
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break;
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src[len] = lcd_read_data(info);
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if (pos == 0x0f)
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pos = 0x40;
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else
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pos++;
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}
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if (retval < 0 && signal_pending(current))
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return -ERESTARTSYS;
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if (copy_to_user(buf, src, len))
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return -EFAULT;
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*ppos += len;
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return len;
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}
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static ssize_t cobalt_lcdfb_write(struct fb_info *info, const char __user *buf,
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size_t count, loff_t *ppos)
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{
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char dst[LCD_CHARS_MAX];
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unsigned long pos;
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int len, retval = 0;
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pos = *ppos;
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if (pos >= LCD_CHARS_MAX || count == 0)
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return 0;
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if (count > LCD_CHARS_MAX)
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count = LCD_CHARS_MAX;
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if (pos + count > LCD_CHARS_MAX)
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count = LCD_CHARS_MAX - pos;
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if (copy_from_user(dst, buf, count))
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return -EFAULT;
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for (len = 0; len < count; len++) {
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retval = lcd_busy_wait(info);
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if (retval < 0)
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break;
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lcd_write_control(info, LCD_TEXT_POS(pos));
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retval = lcd_busy_wait(info);
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if (retval < 0)
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break;
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lcd_write_data(info, dst[len]);
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if (pos == 0x0f)
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pos = 0x40;
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else
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pos++;
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}
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if (retval < 0 && signal_pending(current))
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return -ERESTARTSYS;
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*ppos += len;
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return len;
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}
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static int cobalt_lcdfb_blank(int blank_mode, struct fb_info *info)
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{
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int retval;
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retval = lcd_busy_wait(info);
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if (retval < 0)
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return retval;
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switch (blank_mode) {
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case FB_BLANK_UNBLANK:
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lcd_write_control(info, LCD_ON);
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break;
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default:
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lcd_write_control(info, LCD_OFF);
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break;
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}
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return 0;
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}
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static int cobalt_lcdfb_cursor(struct fb_info *info, struct fb_cursor *cursor)
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{
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u32 x, y;
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int retval;
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switch (cursor->set) {
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case FB_CUR_SETPOS:
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x = cursor->image.dx;
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y = cursor->image.dy;
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if (x >= LCD_XRES_MAX || y >= LCD_YRES_MAX)
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return -EINVAL;
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retval = lcd_busy_wait(info);
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if (retval < 0)
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return retval;
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lcd_write_control(info,
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LCD_TEXT_POS(info->fix.line_length * y + x));
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break;
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default:
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return -EINVAL;
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}
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retval = lcd_busy_wait(info);
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if (retval < 0)
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return retval;
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if (cursor->enable)
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lcd_write_control(info, LCD_CURSOR_ON);
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else
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lcd_write_control(info, LCD_CURSOR_OFF);
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return 0;
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}
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static const struct fb_ops cobalt_lcd_fbops = {
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.owner = THIS_MODULE,
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.fb_read = cobalt_lcdfb_read,
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.fb_write = cobalt_lcdfb_write,
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.fb_blank = cobalt_lcdfb_blank,
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.fb_cursor = cobalt_lcdfb_cursor,
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};
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static int cobalt_lcdfb_probe(struct platform_device *dev)
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{
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struct fb_info *info;
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struct resource *res;
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int retval;
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info = framebuffer_alloc(0, &dev->dev);
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if (!info)
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return -ENOMEM;
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res = platform_get_resource(dev, IORESOURCE_MEM, 0);
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if (!res) {
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framebuffer_release(info);
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return -EBUSY;
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}
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info->screen_size = resource_size(res);
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info->screen_base = devm_ioremap(&dev->dev, res->start,
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info->screen_size);
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if (!info->screen_base) {
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framebuffer_release(info);
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return -ENOMEM;
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}
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info->fbops = &cobalt_lcd_fbops;
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info->fix = cobalt_lcdfb_fix;
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info->fix.smem_start = res->start;
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info->fix.smem_len = info->screen_size;
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info->pseudo_palette = NULL;
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info->par = NULL;
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info->flags = FBINFO_DEFAULT;
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retval = register_framebuffer(info);
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if (retval < 0) {
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framebuffer_release(info);
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return retval;
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}
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platform_set_drvdata(dev, info);
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lcd_clear(info);
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fb_info(info, "Cobalt server LCD frame buffer device\n");
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return 0;
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}
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static int cobalt_lcdfb_remove(struct platform_device *dev)
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{
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struct fb_info *info;
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info = platform_get_drvdata(dev);
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if (info) {
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unregister_framebuffer(info);
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framebuffer_release(info);
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}
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return 0;
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}
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static struct platform_driver cobalt_lcdfb_driver = {
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.probe = cobalt_lcdfb_probe,
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.remove = cobalt_lcdfb_remove,
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.driver = {
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.name = "cobalt-lcd",
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},
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};
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module_platform_driver(cobalt_lcdfb_driver);
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MODULE_LICENSE("GPL v2");
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MODULE_AUTHOR("Yoichi Yuasa");
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MODULE_DESCRIPTION("Cobalt server LCD frame buffer driver");
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