[PATCH] imacfb: Add Intel-based Macintosh Framebuffer Support

This patch adds a new framebuffer driver for the Intel Based macs.  This
framebuffer is needed when booting from EFI to get something out the box.

[akpm: note: doesn't support modular building]

[akpm@osdl.org: cleanups]
Signed-off-by: Edgar Hucek <hostmaster@ed-soft.at>
Signed-off-by: Antonino Daplas <adaplas@pol.net>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

1 files changed, 345 insertions, 0 deletions

diff --git a/drivers/video/imacfb.c b/drivers/video/imacfb.c
new file mode 100644
index 000000000000..7b1c168c834d
--- /dev/null
+++ b/drivers/video/imacfb.c
@@ -0,0 +1,345 @@
+/*
+ * framebuffer driver for Intel Based Mac's
+ *
+ * (c) 2006 Edgar Hucek <gimli@dark-green.com>
+ * Original imac driver written by Gerd Knorr <kraxel@goldbach.in-berlin.de>
+ *
+ */
+
+#include <linux/delay.h>
+#include <linux/errno.h>
+#include <linux/fb.h>
+#include <linux/kernel.h>
+#include <linux/init.h>
+#include <linux/ioport.h>
+#include <linux/mm.h>
+#include <linux/module.h>
+#include <linux/platform_device.h>
+#include <linux/slab.h>
+#include <linux/string.h>
+#include <linux/tty.h>
+
+#include <asm/io.h>
+
+#include <video/vga.h>
+
+typedef enum _MAC_TYPE {
+        M_I17,
+        M_I20,
+        M_MINI,
+        M_MACBOOK,
+        M_NEW
+} MAC_TYPE;
+
+/* --------------------------------------------------------------------- */
+
+static struct fb_var_screeninfo imacfb_defined __initdata = {
+        .activate               = FB_ACTIVATE_NOW,
+        .height                 = -1,
+        .width                  = -1,
+        .right_margin           = 32,
+        .upper_margin           = 16,
+        .lower_margin           = 4,
+        .vsync_len              = 4,
+        .vmode                  = FB_VMODE_NONINTERLACED,
+};
+
+static struct fb_fix_screeninfo imacfb_fix __initdata = {
+        .id                     = "IMAC VGA",
+        .type                   = FB_TYPE_PACKED_PIXELS,
+        .accel                  = FB_ACCEL_NONE,
+        .visual                 = FB_VISUAL_TRUECOLOR,
+};
+
+static int inverse;
+static int model                = M_NEW;
+static int manual_height;
+static int manual_width;
+
+#define DEFAULT_FB_MEM  1024*1024*16
+
+/* --------------------------------------------------------------------- */
+
+static int imacfb_setcolreg(unsigned regno, unsigned red, unsigned green,
+                            unsigned blue, unsigned transp,
+                            struct fb_info *info)
+{
+        /*
+         *  Set a single color register. The values supplied are
+         *  already rounded down to the hardware's capabilities
+         *  (according to the entries in the `var' structure). Return
+         *  != 0 for invalid regno.
+         */
+
+        if (regno >= info->cmap.len)
+                return 1;
+
+        if (regno < 16) {
+                red   >>= 8;
+                green >>= 8;
+                blue  >>= 8;
+                ((u32 *)(info->pseudo_palette))[regno] =
+                        (red   << info->var.red.offset)   |
+                        (green << info->var.green.offset) |
+                        (blue  << info->var.blue.offset);
+        }
+        return 0;
+}
+
+static struct fb_ops imacfb_ops = {
+        .owner          = THIS_MODULE,
+        .fb_setcolreg   = imacfb_setcolreg,
+        .fb_fillrect    = cfb_fillrect,
+        .fb_copyarea    = cfb_copyarea,
+        .fb_imageblit   = cfb_imageblit,
+};
+
+static int __init imacfb_setup(char *options)
+{
+        char *this_opt;
+
+        if (!options || !*options)
+                return 0;
+
+        while ((this_opt = strsep(&options, ",")) != NULL) {
+                if (!*this_opt) continue;
+
+                if (!strcmp(this_opt, "inverse"))
+                        inverse = 1;
+                else if (!strcmp(this_opt, "i17"))
+                        model = M_I17;
+                else if (!strcmp(this_opt, "i20"))
+                        model = M_I20;
+                else if (!strcmp(this_opt, "mini"))
+                        model = M_MINI;
+                else if (!strcmp(this_opt, "macbook"))
+                        model = M_MACBOOK;
+                else if (!strncmp(this_opt, "height:", 7))
+                        manual_height = simple_strtoul(this_opt+7, NULL, 0);
+                else if (!strncmp(this_opt, "width:", 6))
+                        manual_width = simple_strtoul(this_opt+6, NULL, 0);
+        }
+        return 0;
+}
+
+static int __init imacfb_probe(struct platform_device *dev)
+{
+        struct fb_info *info;
+        int err;
+        unsigned int size_vmode;
+        unsigned int size_remap;
+        unsigned int size_total;
+
+        screen_info.lfb_depth = 32;
+        screen_info.lfb_size = DEFAULT_FB_MEM / 0x10000;
+        screen_info.pages=1;
+        screen_info.blue_size = 8;
+        screen_info.blue_pos = 0;
+        screen_info.green_size = 8;
+        screen_info.green_pos = 8;
+        screen_info.red_size = 8;
+        screen_info.red_pos = 16;
+        screen_info.rsvd_size = 8;
+        screen_info.rsvd_pos = 24;
+
+        switch (model) {
+        case M_I17:
+                screen_info.lfb_width = 1440;
+                screen_info.lfb_height = 900;
+                screen_info.lfb_linelength = 1472 * 4;
+                screen_info.lfb_base = 0x80010000;
+                break;
+        case M_NEW:
+        case M_I20:
+                screen_info.lfb_width = 1680;
+                screen_info.lfb_height = 1050;
+                screen_info.lfb_linelength = 1728 * 4;
+                screen_info.lfb_base = 0x80010000;
+                break;
+        case M_MINI:
+                screen_info.lfb_width = 1024;
+                screen_info.lfb_height = 768;
+                screen_info.lfb_linelength = 2048 * 4;
+                screen_info.lfb_base = 0x80000000;
+                break;
+        case M_MACBOOK:
+                screen_info.lfb_width = 1280;
+                screen_info.lfb_height = 800;
+                screen_info.lfb_linelength = 2048 * 4;
+                screen_info.lfb_base = 0x80000000;
+                break;
+        }
+
+        /* if the user wants to manually specify height/width,
+           we will override the defaults */
+        /* TODO: eventually get auto-detection working */
+        if (manual_height > 0)
+                screen_info.lfb_height = manual_height;
+        if (manual_width > 0)
+                screen_info.lfb_width = manual_width;
+
+        imacfb_fix.smem_start = screen_info.lfb_base;
+        imacfb_defined.bits_per_pixel = screen_info.lfb_depth;
+        imacfb_defined.xres = screen_info.lfb_width;
+        imacfb_defined.yres = screen_info.lfb_height;
+        imacfb_fix.line_length = screen_info.lfb_linelength;
+
+        /*   size_vmode -- that is the amount of memory needed for the
+         *                 used video mode, i.e. the minimum amount of
+         *                 memory we need. */
+        size_vmode = imacfb_defined.yres * imacfb_fix.line_length;
+
+        /*   size_total -- all video memory we have. Used for
+         *                 entries, ressource allocation and bounds
+         *                 checking. */
+        size_total = screen_info.lfb_size * 65536;
+        if (size_total < size_vmode)
+                size_total = size_vmode;
+
+        /*   size_remap -- the amount of video memory we are going to
+         *                 use for imacfb.  With modern cards it is no
+         *                 option to simply use size_total as that
+         *                 wastes plenty of kernel address space. */
+        size_remap  = size_vmode * 2;
+        if (size_remap < size_vmode)
+                size_remap = size_vmode;
+        if (size_remap > size_total)
+                size_remap = size_total;
+        imacfb_fix.smem_len = size_remap;
+
+#ifndef __i386__
+        screen_info.imacpm_seg = 0;
+#endif
+
+        if (!request_mem_region(imacfb_fix.smem_start, size_total, "imacfb")) {
+                printk(KERN_WARNING
+                       "imacfb: cannot reserve video memory at 0x%lx\n",
+                        imacfb_fix.smem_start);
+                /* We cannot make this fatal. Sometimes this comes from magic
+                   spaces our resource handlers simply don't know about */
+        }
+
+        info = framebuffer_alloc(sizeof(u32) * 16, &dev->dev);
+        if (!info) {
+                err = -ENOMEM;
+                goto err_release_mem;
+        }
+        info->pseudo_palette = info->par;
+        info->par = NULL;
+
+        info->screen_base = ioremap(imacfb_fix.smem_start, imacfb_fix.smem_len);
+        if (!info->screen_base) {
+                printk(KERN_ERR "imacfb: abort, cannot ioremap video memory "
+                                "0x%x @ 0x%lx\n",
+                        imacfb_fix.smem_len, imacfb_fix.smem_start);
+                err = -EIO;
+                goto err_unmap;
+        }
+
+        printk(KERN_INFO "imacfb: framebuffer at 0x%lx, mapped to 0x%p, "
+               "using %dk, total %dk\n",
+               imacfb_fix.smem_start, info->screen_base,
+               size_remap/1024, size_total/1024);
+        printk(KERN_INFO "imacfb: mode is %dx%dx%d, linelength=%d, pages=%d\n",
+               imacfb_defined.xres, imacfb_defined.yres,
+               imacfb_defined.bits_per_pixel, imacfb_fix.line_length,
+               screen_info.pages);
+
+        imacfb_defined.xres_virtual = imacfb_defined.xres;
+        imacfb_defined.yres_virtual = imacfb_fix.smem_len /
+                                        imacfb_fix.line_length;
+        printk(KERN_INFO "imacfb: scrolling: redraw\n");
+        imacfb_defined.yres_virtual = imacfb_defined.yres;
+
+        /* some dummy values for timing to make fbset happy */
+        imacfb_defined.pixclock     = 10000000 / imacfb_defined.xres *
+                                        1000 / imacfb_defined.yres;
+        imacfb_defined.left_margin  = (imacfb_defined.xres / 8) & 0xf8;
+        imacfb_defined.hsync_len    = (imacfb_defined.xres / 8) & 0xf8;
+
+        imacfb_defined.red.offset    = screen_info.red_pos;
+        imacfb_defined.red.length    = screen_info.red_size;
+        imacfb_defined.green.offset  = screen_info.green_pos;
+        imacfb_defined.green.length  = screen_info.green_size;
+        imacfb_defined.blue.offset   = screen_info.blue_pos;
+        imacfb_defined.blue.length   = screen_info.blue_size;
+        imacfb_defined.transp.offset = screen_info.rsvd_pos;
+        imacfb_defined.transp.length = screen_info.rsvd_size;
+
+        printk(KERN_INFO "imacfb: %s: "
+               "size=%d:%d:%d:%d, shift=%d:%d:%d:%d\n",
+               "Truecolor",
+               screen_info.rsvd_size,
+               screen_info.red_size,
+               screen_info.green_size,
+               screen_info.blue_size,
+               screen_info.rsvd_pos,
+               screen_info.red_pos,
+               screen_info.green_pos,
+               screen_info.blue_pos);
+
+        imacfb_fix.ypanstep  = 0;
+        imacfb_fix.ywrapstep = 0;
+
+        /* request failure does not faze us, as vgacon probably has this
+         * region already (FIXME) */
+        request_region(0x3c0, 32, "imacfb");
+
+        info->fbops = &imacfb_ops;
+        info->var = imacfb_defined;
+        info->fix = imacfb_fix;
+        info->flags = FBINFO_FLAG_DEFAULT;
+
+        if (fb_alloc_cmap(&info->cmap, 256, 0) < 0) {
+                err = -ENOMEM;
+                goto err_unmap;
+        }
+        if (register_framebuffer(info)<0) {
+                err = -EINVAL;
+                goto err_fb_dealoc;
+        }
+        printk(KERN_INFO "fb%d: %s frame buffer device\n",
+               info->node, info->fix.id);
+        return 0;
+
+err_fb_dealoc:
+        fb_dealloc_cmap(&info->cmap);
+err_unmap:
+        iounmap(info->screen_base);
+        framebuffer_release(info);
+err_release_mem:
+        release_mem_region(imacfb_fix.smem_start, size_total);
+        return err;
+}
+
+static struct platform_driver imacfb_driver = {
+        .probe  = imacfb_probe,
+        .driver = {
+                .name   = "imacfb",
+        },
+};
+
+static struct platform_device imacfb_device = {
+        .name   = "imacfb",
+};
+
+static int __init imacfb_init(void)
+{
+        int ret;
+        char *option = NULL;
+
+        /* ignore error return of fb_get_options */
+        fb_get_options("imacfb", &option);
+        imacfb_setup(option);
+        ret = platform_driver_register(&imacfb_driver);
+
+        if (!ret) {
+                ret = platform_device_register(&imacfb_device);
+                if (ret)
+                        platform_driver_unregister(&imacfb_driver);
+        }
+        return ret;
+}
+module_init(imacfb_init);
+
+MODULE_LICENSE("GPL");