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path: root/drivers/video/vesafb.c
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Diffstat (limited to 'drivers/video/vesafb.c')
-rw-r--r--drivers/video/vesafb.c456
1 files changed, 456 insertions, 0 deletions
diff --git a/drivers/video/vesafb.c b/drivers/video/vesafb.c
new file mode 100644
index 00000000000..8fc1278d7fb
--- /dev/null
+++ b/drivers/video/vesafb.c
@@ -0,0 +1,456 @@
+/*
+ * framebuffer driver for VBE 2.0 compliant graphic boards
+ *
+ * switching to graphics mode happens at boot time (while
+ * running in real mode, see arch/i386/boot/video.S).
+ *
+ * (c) 1998 Gerd Knorr <kraxel@goldbach.in-berlin.de>
+ *
+ */
+
+#include <linux/module.h>
+#include <linux/kernel.h>
+#include <linux/errno.h>
+#include <linux/string.h>
+#include <linux/mm.h>
+#include <linux/tty.h>
+#include <linux/slab.h>
+#include <linux/delay.h>
+#include <linux/fb.h>
+#include <linux/ioport.h>
+#include <linux/init.h>
+#ifdef __i386__
+#include <video/edid.h>
+#endif
+#include <asm/io.h>
+#include <asm/mtrr.h>
+
+#define dac_reg (0x3c8)
+#define dac_val (0x3c9)
+
+/* --------------------------------------------------------------------- */
+
+static struct fb_var_screeninfo vesafb_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 vesafb_fix __initdata = {
+ .id = "VESA VGA",
+ .type = FB_TYPE_PACKED_PIXELS,
+ .accel = FB_ACCEL_NONE,
+};
+
+static int inverse = 0;
+static int mtrr = 1;
+static int vram_remap __initdata = 0; /* Set amount of memory to be used */
+static int vram_total __initdata = 0; /* Set total amount of memory */
+static int pmi_setpal = 0; /* pmi for palette changes ??? */
+static int ypan = 0; /* 0..nothing, 1..ypan, 2..ywrap */
+static unsigned short *pmi_base = NULL;
+static void (*pmi_start)(void);
+static void (*pmi_pal)(void);
+static int depth;
+
+/* --------------------------------------------------------------------- */
+
+static int vesafb_pan_display(struct fb_var_screeninfo *var,
+ struct fb_info *info)
+{
+#ifdef __i386__
+ int offset;
+
+ if (!ypan)
+ return -EINVAL;
+ if (var->xoffset)
+ return -EINVAL;
+ if (var->yoffset > var->yres_virtual)
+ return -EINVAL;
+ if ((ypan==1) && var->yoffset+var->yres > var->yres_virtual)
+ return -EINVAL;
+
+ offset = (var->yoffset * info->fix.line_length + var->xoffset) / 4;
+
+ __asm__ __volatile__(
+ "call *(%%edi)"
+ : /* no return value */
+ : "a" (0x4f07), /* EAX */
+ "b" (0), /* EBX */
+ "c" (offset), /* ECX */
+ "d" (offset >> 16), /* EDX */
+ "D" (&pmi_start)); /* EDI */
+#endif
+ return 0;
+}
+
+static void vesa_setpalette(int regno, unsigned red, unsigned green,
+ unsigned blue)
+{
+#ifdef __i386__
+ struct { u_char blue, green, red, pad; } entry;
+ int shift = 16 - depth;
+
+ if (pmi_setpal) {
+ entry.red = red >> shift;
+ entry.green = green >> shift;
+ entry.blue = blue >> shift;
+ entry.pad = 0;
+ __asm__ __volatile__(
+ "call *(%%esi)"
+ : /* no return value */
+ : "a" (0x4f09), /* EAX */
+ "b" (0), /* EBX */
+ "c" (1), /* ECX */
+ "d" (regno), /* EDX */
+ "D" (&entry), /* EDI */
+ "S" (&pmi_pal)); /* ESI */
+ } else {
+ /* without protected mode interface, try VGA registers... */
+ outb_p(regno, dac_reg);
+ outb_p(red >> shift, dac_val);
+ outb_p(green >> shift, dac_val);
+ outb_p(blue >> shift, dac_val);
+ }
+#endif
+}
+
+static int vesafb_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;
+
+ switch (info->var.bits_per_pixel) {
+ case 8:
+ vesa_setpalette(regno,red,green,blue);
+ break;
+ case 16:
+ if (info->var.red.offset == 10) {
+ /* 1:5:5:5 */
+ ((u32*) (info->pseudo_palette))[regno] =
+ ((red & 0xf800) >> 1) |
+ ((green & 0xf800) >> 6) |
+ ((blue & 0xf800) >> 11);
+ } else {
+ /* 0:5:6:5 */
+ ((u32*) (info->pseudo_palette))[regno] =
+ ((red & 0xf800) ) |
+ ((green & 0xfc00) >> 5) |
+ ((blue & 0xf800) >> 11);
+ }
+ break;
+ case 24:
+ 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);
+ break;
+ case 32:
+ 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);
+ break;
+ }
+ return 0;
+}
+
+static struct fb_ops vesafb_ops = {
+ .owner = THIS_MODULE,
+ .fb_setcolreg = vesafb_setcolreg,
+ .fb_pan_display = vesafb_pan_display,
+ .fb_fillrect = cfb_fillrect,
+ .fb_copyarea = cfb_copyarea,
+ .fb_imageblit = cfb_imageblit,
+ .fb_cursor = soft_cursor,
+};
+
+static int __init vesafb_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, "redraw"))
+ ypan=0;
+ else if (! strcmp(this_opt, "ypan"))
+ ypan=1;
+ else if (! strcmp(this_opt, "ywrap"))
+ ypan=2;
+ else if (! strcmp(this_opt, "vgapal"))
+ pmi_setpal=0;
+ else if (! strcmp(this_opt, "pmipal"))
+ pmi_setpal=1;
+ else if (! strcmp(this_opt, "mtrr"))
+ mtrr=1;
+ else if (! strcmp(this_opt, "nomtrr"))
+ mtrr=0;
+ else if (! strncmp(this_opt, "vtotal:", 7))
+ vram_total = simple_strtoul(this_opt+7, NULL, 0);
+ else if (! strncmp(this_opt, "vremap:", 7))
+ vram_remap = simple_strtoul(this_opt+7, NULL, 0);
+ }
+ return 0;
+}
+
+static int __init vesafb_probe(struct device *device)
+{
+ struct platform_device *dev = to_platform_device(device);
+ struct fb_info *info;
+ int i, err;
+ unsigned int size_vmode;
+ unsigned int size_remap;
+ unsigned int size_total;
+
+ if (screen_info.orig_video_isVGA != VIDEO_TYPE_VLFB)
+ return -ENODEV;
+
+ vesafb_fix.smem_start = screen_info.lfb_base;
+ vesafb_defined.bits_per_pixel = screen_info.lfb_depth;
+ if (15 == vesafb_defined.bits_per_pixel)
+ vesafb_defined.bits_per_pixel = 16;
+ vesafb_defined.xres = screen_info.lfb_width;
+ vesafb_defined.yres = screen_info.lfb_height;
+ vesafb_fix.line_length = screen_info.lfb_linelength;
+ vesafb_fix.visual = (vesafb_defined.bits_per_pixel == 8) ?
+ FB_VISUAL_PSEUDOCOLOR : FB_VISUAL_TRUECOLOR;
+
+ /* 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 = vesafb_defined.yres * vesafb_fix.line_length;
+
+ /* size_total -- all video memory we have. Used for mtrr
+ * entries, ressource allocation and bounds
+ * checking. */
+ size_total = screen_info.lfb_size * 65536;
+ if (vram_total)
+ size_total = vram_total * 1024 * 1024;
+ if (size_total < size_vmode)
+ size_total = size_vmode;
+
+ /* size_remap -- the amount of video memory we are going to
+ * use for vesafb. 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 (vram_remap)
+ size_remap = vram_remap * 1024 * 1024;
+ if (size_remap < size_vmode)
+ size_remap = size_vmode;
+ if (size_remap > size_total)
+ size_remap = size_total;
+ vesafb_fix.smem_len = size_remap;
+
+#ifndef __i386__
+ screen_info.vesapm_seg = 0;
+#endif
+
+ if (!request_mem_region(vesafb_fix.smem_start, size_total, "vesafb")) {
+ printk(KERN_WARNING
+ "vesafb: abort, cannot reserve video memory at 0x%lx\n",
+ vesafb_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) * 256, &dev->dev);
+ if (!info) {
+ release_mem_region(vesafb_fix.smem_start, vesafb_fix.smem_len);
+ return -ENOMEM;
+ }
+ info->pseudo_palette = info->par;
+ info->par = NULL;
+
+ info->screen_base = ioremap(vesafb_fix.smem_start, vesafb_fix.smem_len);
+ if (!info->screen_base) {
+ printk(KERN_ERR
+ "vesafb: abort, cannot ioremap video memory 0x%x @ 0x%lx\n",
+ vesafb_fix.smem_len, vesafb_fix.smem_start);
+ err = -EIO;
+ goto err;
+ }
+
+ printk(KERN_INFO "vesafb: framebuffer at 0x%lx, mapped to 0x%p, "
+ "using %dk, total %dk\n",
+ vesafb_fix.smem_start, info->screen_base,
+ size_remap/1024, size_total/1024);
+ printk(KERN_INFO "vesafb: mode is %dx%dx%d, linelength=%d, pages=%d\n",
+ vesafb_defined.xres, vesafb_defined.yres, vesafb_defined.bits_per_pixel, vesafb_fix.line_length, screen_info.pages);
+
+ if (screen_info.vesapm_seg) {
+ printk(KERN_INFO "vesafb: protected mode interface info at %04x:%04x\n",
+ screen_info.vesapm_seg,screen_info.vesapm_off);
+ }
+
+ if (screen_info.vesapm_seg < 0xc000)
+ ypan = pmi_setpal = 0; /* not available or some DOS TSR ... */
+
+ if (ypan || pmi_setpal) {
+ pmi_base = (unsigned short*)phys_to_virt(((unsigned long)screen_info.vesapm_seg << 4) + screen_info.vesapm_off);
+ pmi_start = (void*)((char*)pmi_base + pmi_base[1]);
+ pmi_pal = (void*)((char*)pmi_base + pmi_base[2]);
+ printk(KERN_INFO "vesafb: pmi: set display start = %p, set palette = %p\n",pmi_start,pmi_pal);
+ if (pmi_base[3]) {
+ printk(KERN_INFO "vesafb: pmi: ports = ");
+ for (i = pmi_base[3]/2; pmi_base[i] != 0xffff; i++)
+ printk("%x ",pmi_base[i]);
+ printk("\n");
+ if (pmi_base[i] != 0xffff) {
+ /*
+ * memory areas not supported (yet?)
+ *
+ * Rules are: we have to set up a descriptor for the requested
+ * memory area and pass it in the ES register to the BIOS function.
+ */
+ printk(KERN_INFO "vesafb: can't handle memory requests, pmi disabled\n");
+ ypan = pmi_setpal = 0;
+ }
+ }
+ }
+
+ vesafb_defined.xres_virtual = vesafb_defined.xres;
+ vesafb_defined.yres_virtual = vesafb_fix.smem_len / vesafb_fix.line_length;
+ if (ypan && vesafb_defined.yres_virtual > vesafb_defined.yres) {
+ printk(KERN_INFO "vesafb: scrolling: %s using protected mode interface, yres_virtual=%d\n",
+ (ypan > 1) ? "ywrap" : "ypan",vesafb_defined.yres_virtual);
+ } else {
+ printk(KERN_INFO "vesafb: scrolling: redraw\n");
+ vesafb_defined.yres_virtual = vesafb_defined.yres;
+ ypan = 0;
+ }
+
+ /* some dummy values for timing to make fbset happy */
+ vesafb_defined.pixclock = 10000000 / vesafb_defined.xres * 1000 / vesafb_defined.yres;
+ vesafb_defined.left_margin = (vesafb_defined.xres / 8) & 0xf8;
+ vesafb_defined.hsync_len = (vesafb_defined.xres / 8) & 0xf8;
+
+ vesafb_defined.red.offset = screen_info.red_pos;
+ vesafb_defined.red.length = screen_info.red_size;
+ vesafb_defined.green.offset = screen_info.green_pos;
+ vesafb_defined.green.length = screen_info.green_size;
+ vesafb_defined.blue.offset = screen_info.blue_pos;
+ vesafb_defined.blue.length = screen_info.blue_size;
+ vesafb_defined.transp.offset = screen_info.rsvd_pos;
+ vesafb_defined.transp.length = screen_info.rsvd_size;
+
+ if (vesafb_defined.bits_per_pixel <= 8) {
+ depth = vesafb_defined.green.length;
+ vesafb_defined.red.length =
+ vesafb_defined.green.length =
+ vesafb_defined.blue.length =
+ vesafb_defined.bits_per_pixel;
+ }
+
+ printk(KERN_INFO "vesafb: %s: "
+ "size=%d:%d:%d:%d, shift=%d:%d:%d:%d\n",
+ (vesafb_defined.bits_per_pixel > 8) ?
+ "Truecolor" : "Pseudocolor",
+ 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);
+
+ vesafb_fix.ypanstep = ypan ? 1 : 0;
+ vesafb_fix.ywrapstep = (ypan>1) ? 1 : 0;
+
+ /* request failure does not faze us, as vgacon probably has this
+ * region already (FIXME) */
+ request_region(0x3c0, 32, "vesafb");
+
+ if (mtrr) {
+ int temp_size = size_total;
+ /* Find the largest power-of-two */
+ while (temp_size & (temp_size - 1))
+ temp_size &= (temp_size - 1);
+
+ /* Try and find a power of two to add */
+ while (temp_size && mtrr_add(vesafb_fix.smem_start, temp_size, MTRR_TYPE_WRCOMB, 1)==-EINVAL) {
+ temp_size >>= 1;
+ }
+ }
+
+ info->fbops = &vesafb_ops;
+ info->var = vesafb_defined;
+ info->fix = vesafb_fix;
+ info->flags = FBINFO_FLAG_DEFAULT |
+ (ypan) ? FBINFO_HWACCEL_YPAN : 0;
+
+ if (fb_alloc_cmap(&info->cmap, 256, 0) < 0) {
+ err = -ENOMEM;
+ goto err;
+ }
+ if (register_framebuffer(info)<0) {
+ err = -EINVAL;
+ fb_dealloc_cmap(&info->cmap);
+ goto err;
+ }
+ printk(KERN_INFO "fb%d: %s frame buffer device\n",
+ info->node, info->fix.id);
+ return 0;
+err:
+ framebuffer_release(info);
+ release_mem_region(vesafb_fix.smem_start, size_total);
+ return err;
+}
+
+static struct device_driver vesafb_driver = {
+ .name = "vesafb",
+ .bus = &platform_bus_type,
+ .probe = vesafb_probe,
+};
+
+static struct platform_device vesafb_device = {
+ .name = "vesafb",
+};
+
+static int __init vesafb_init(void)
+{
+ int ret;
+ char *option = NULL;
+
+ /* ignore error return of fb_get_options */
+ fb_get_options("vesafb", &option);
+ vesafb_setup(option);
+ ret = driver_register(&vesafb_driver);
+
+ if (!ret) {
+ ret = platform_device_register(&vesafb_device);
+ if (ret)
+ driver_unregister(&vesafb_driver);
+ }
+ return ret;
+}
+module_init(vesafb_init);
+
+MODULE_LICENSE("GPL");
generated by cgit v1.2.3-18-g5258 (git 2.32.0) at 2024-12-11 13:39:27 +0000