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[PATCH v2][1/2] add new Cobalt LCD framebuffer driver

To: Andrew Morton <akpm@linux-foundation.org>
Subject: [PATCH v2][1/2] add new Cobalt LCD framebuffer driver
From: Yoichi Yuasa <yoichi_yuasa@tripeaks.co.jp>
Date: Thu, 26 Jun 2008 21:50:18 +0900
Cc: yoichi_yuasa@tripeaks.co.jp, linux-fbdev-devel <linux-fbdev-devel@lists.sourceforge.net>, linux-mips <linux-mips@linux-mips.org>, Ralf Baechle <ralf@linux-mips.org>
Organization: TriPeaks Corporation
Original-recipient: rfc822;linux-mips@linux-mips.org
Sender: linux-mips-bounce@linux-mips.org
Add new Cobalt LCD framebuffer driver.

Signed-off-by: Yoichi Yuasa <yoichi_yuasa@tripeaks.co.jp>

diff -pruN -X /home/yuasa/Memo/dontdiff linux-orig/drivers/video/Kconfig 
linux/drivers/video/Kconfig
--- linux-orig/drivers/video/Kconfig    2008-06-25 15:53:46.017857142 +0900
+++ linux/drivers/video/Kconfig 2008-06-25 23:18:03.687968473 +0900
@@ -1950,6 +1950,10 @@ config FB_AM200EPD
          This enables support for the Metronome display controller used on
          the E-Ink AM-200 EPD devkit.
 
+config FB_COBALT
+       tristate "Cobalt server LCD frame buffer support"
+       depends on FB && MIPS_COBALT
+
 config FB_VIRTUAL
        tristate "Virtual Frame Buffer support (ONLY FOR TESTING!)"
        depends on FB
diff -pruN -X /home/yuasa/Memo/dontdiff linux-orig/drivers/video/Makefile 
linux/drivers/video/Makefile
--- linux-orig/drivers/video/Makefile   2008-06-25 15:53:46.017857142 +0900
+++ linux/drivers/video/Makefile        2008-06-25 23:17:25.277779602 +0900
@@ -117,6 +117,7 @@ obj-$(CONFIG_FB_SM501)            += sm5
 obj-$(CONFIG_FB_XILINX)           += xilinxfb.o
 obj-$(CONFIG_FB_OMAP)             += omap/
 obj-$(CONFIG_XEN_FBDEV_FRONTEND)  += xen-fbfront.o
+obj-$(CONFIG_FB_COBALT)           += cobalt_lcdfb.o
 
 # Platform or fallback drivers go here
 obj-$(CONFIG_FB_UVESA)            += uvesafb.o
diff -pruN -X /home/yuasa/Memo/dontdiff linux-orig/drivers/video/cobalt_lcdfb.c 
linux/drivers/video/cobalt_lcdfb.c
--- linux-orig/drivers/video/cobalt_lcdfb.c     1970-01-01 09:00:00.000000000 
+0900
+++ linux/drivers/video/cobalt_lcdfb.c  2008-06-25 23:58:52.951544053 +0900
@@ -0,0 +1,370 @@
+/*
+ *  Cobalt server LCD frame buffer driver.
+ *
+ *  Copyright (C) 2008  Yoichi Yuasa <yoichi_yuasa@tripeaks.co.jp>
+ *
+ *  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/platform_device.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)
+
+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;
+}
+
+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 __initdata = {
+       .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 __init 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 = res->end - res->start + 1;
+       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");

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