fbdev: add new Cobalt LCD framebuffer driver

Add new Cobalt LCD framebuffer driver.

[akpm@linux-foundation.org: fix build]
Signed-off-by: Yoichi Yuasa <yoichi_yuasa@tripeaks.co.jp>
Cc: Krzysztof Helt <krzysztof.h1@poczta.fm>
Cc: "Antonino A. Daplas" <adaplas@pol.net>
Cc: Ralf Baechle <ralf@linux-mips.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

1 files changed, 371 insertions, 0 deletions

diff --git a/drivers/video/cobalt_lcdfb.c b/drivers/video/cobalt_lcdfb.c
new file mode 100644
index 000000000000..7bad24ed04ef
--- /dev/null
+++ b/drivers/video/cobalt_lcdfb.c
@@ -0,0 +1,371 @@
+/*
+ *  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/uaccess.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");