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Diffstat (limited to 'drivers/video/fbdev/vesafb.c')
-rw-r--r--drivers/video/fbdev/vesafb.c506
1 files changed, 506 insertions, 0 deletions
diff --git a/drivers/video/fbdev/vesafb.c b/drivers/video/fbdev/vesafb.c
new file mode 100644
index 0000000000..c0edceea0a
--- /dev/null
+++ b/drivers/video/fbdev/vesafb.c
@@ -0,0 +1,506 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * 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/aperture.h>
+#include <linux/module.h>
+#include <linux/kernel.h>
+#include <linux/errno.h>
+#include <linux/string.h>
+#include <linux/mm.h>
+#include <linux/delay.h>
+#include <linux/fb.h>
+#include <linux/ioport.h>
+#include <linux/init.h>
+#include <linux/platform_device.h>
+#include <linux/screen_info.h>
+#include <linux/io.h>
+
+#include <video/vga.h>
+
+#define dac_reg (0x3c8)
+#define dac_val (0x3c9)
+
+/* --------------------------------------------------------------------- */
+
+struct vesafb_par {
+ u32 pseudo_palette[256];
+ resource_size_t base;
+ resource_size_t size;
+ int wc_cookie;
+ struct resource *region;
+};
+
+static struct fb_var_screeninfo vesafb_defined = {
+ .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 = {
+ .id = "VESA VGA",
+ .type = FB_TYPE_PACKED_PIXELS,
+ .accel = FB_ACCEL_NONE,
+};
+
+static int inverse __read_mostly;
+static int mtrr __read_mostly; /* disable mtrr */
+static int vram_remap; /* Set amount of memory to be used */
+static int vram_total; /* Set total amount of memory */
+static int pmi_setpal __read_mostly = 1; /* pmi for palette changes ??? */
+static int ypan __read_mostly; /* 0..nothing, 1..ypan, 2..ywrap */
+static void (*pmi_start)(void) __read_mostly;
+static void (*pmi_pal) (void) __read_mostly;
+static int depth __read_mostly;
+static int vga_compat __read_mostly;
+/* --------------------------------------------------------------------- */
+
+static int vesafb_pan_display(struct fb_var_screeninfo *var,
+ struct fb_info *info)
+{
+#ifdef __i386__
+ int offset;
+
+ 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 int vesa_setpalette(int regno, unsigned red, unsigned green,
+ unsigned blue)
+{
+ int shift = 16 - depth;
+ int err = -EINVAL;
+
+/*
+ * Try VGA registers first...
+ */
+ if (vga_compat) {
+ outb_p(regno, dac_reg);
+ outb_p(red >> shift, dac_val);
+ outb_p(green >> shift, dac_val);
+ outb_p(blue >> shift, dac_val);
+ err = 0;
+ }
+
+#ifdef __i386__
+/*
+ * Fallback to the PMI....
+ */
+ if (err && pmi_setpal) {
+ struct { u_char blue, green, red, pad; } entry;
+
+ 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 */
+ err = 0;
+ }
+#endif
+
+ return err;
+}
+
+static int vesafb_setcolreg(unsigned regno, unsigned red, unsigned green,
+ unsigned blue, unsigned transp,
+ struct fb_info *info)
+{
+ int err = 0;
+
+ /*
+ * 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 (info->var.bits_per_pixel == 8)
+ err = vesa_setpalette(regno,red,green,blue);
+ else if (regno < 16) {
+ switch (info->var.bits_per_pixel) {
+ 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:
+ 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 err;
+}
+
+/*
+ * fb_ops.fb_destroy is called by the last put_fb_info() call at the end
+ * of unregister_framebuffer() or fb_release(). Do any cleanup here.
+ */
+static void vesafb_destroy(struct fb_info *info)
+{
+ struct vesafb_par *par = info->par;
+
+ fb_dealloc_cmap(&info->cmap);
+ arch_phys_wc_del(par->wc_cookie);
+ if (info->screen_base)
+ iounmap(info->screen_base);
+ release_mem_region(par->base, par->size);
+
+ framebuffer_release(info);
+}
+
+static struct fb_ops vesafb_ops = {
+ .owner = THIS_MODULE,
+ FB_DEFAULT_IOMEM_OPS,
+ .fb_destroy = vesafb_destroy,
+ .fb_setcolreg = vesafb_setcolreg,
+ .fb_pan_display = vesafb_pan_display,
+};
+
+static int 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 (! strncmp(this_opt, "mtrr:", 5))
+ mtrr = simple_strtoul(this_opt+5, NULL, 0);
+ 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 vesafb_probe(struct platform_device *dev)
+{
+ struct fb_info *info;
+ struct vesafb_par *par;
+ int i, err;
+ unsigned int size_vmode;
+ unsigned int size_remap;
+ unsigned int size_total;
+ char *option = NULL;
+
+ /* ignore error return of fb_get_options */
+ fb_get_options("vesafb", &option);
+ vesafb_setup(option);
+
+ if (screen_info.orig_video_isVGA != VIDEO_TYPE_VLFB)
+ return -ENODEV;
+
+ vga_compat = (screen_info.capabilities & 2) ? 0 : 1;
+ 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, resource 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: 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(struct vesafb_par), &dev->dev);
+ if (!info) {
+ release_mem_region(vesafb_fix.smem_start, size_total);
+ return -ENOMEM;
+ }
+ platform_set_drvdata(dev, info);
+ par = info->par;
+ info->pseudo_palette = par->pseudo_palette;
+
+ par->base = screen_info.lfb_base;
+ par->size = size_total;
+
+ 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) {
+ unsigned short *pmi_base;
+ 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;
+ }
+ }
+ }
+
+ if (vesafb_defined.bits_per_pixel == 8 && !pmi_setpal && !vga_compat) {
+ printk(KERN_WARNING "vesafb: hardware palette is unchangeable,\n"
+ " colors may be incorrect\n");
+ vesafb_fix.visual = FB_VISUAL_STATIC_PSEUDOCOLOR;
+ }
+
+ 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" : (vga_compat || pmi_setpal) ?
+ "Pseudocolor" : "Static 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) */
+ par->region = request_region(0x3c0, 32, "vesafb");
+
+ if (mtrr == 3) {
+ unsigned int temp_size = size_total;
+
+ /* Find the largest power-of-two */
+ temp_size = roundup_pow_of_two(temp_size);
+
+ /* Try and find a power of two to add */
+ do {
+ par->wc_cookie =
+ arch_phys_wc_add(vesafb_fix.smem_start,
+ temp_size);
+ temp_size >>= 1;
+ } while (temp_size >= PAGE_SIZE && par->wc_cookie < 0);
+
+ info->screen_base = ioremap_wc(vesafb_fix.smem_start, vesafb_fix.smem_len);
+ } else {
+ if (mtrr && mtrr != 3)
+ WARN_ONCE(1, "Only MTRR_TYPE_WRCOMB (3) make sense\n");
+ 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_release_region;
+ }
+
+ 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);
+
+ if (!ypan)
+ vesafb_ops.fb_pan_display = NULL;
+
+ info->fbops = &vesafb_ops;
+ info->var = vesafb_defined;
+ info->fix = vesafb_fix;
+ info->flags = (ypan ? FBINFO_HWACCEL_YPAN : 0);
+
+ if (fb_alloc_cmap(&info->cmap, 256, 0) < 0) {
+ err = -ENOMEM;
+ goto err_release_region;
+ }
+ err = devm_aperture_acquire_for_platform_device(dev, par->base, par->size);
+ if (err)
+ goto err_fb_dealloc_cmap;
+ if (register_framebuffer(info)<0) {
+ err = -EINVAL;
+ goto err_fb_dealloc_cmap;
+ }
+ fb_info(info, "%s frame buffer device\n", info->fix.id);
+ return 0;
+err_fb_dealloc_cmap:
+ fb_dealloc_cmap(&info->cmap);
+err_release_region:
+ arch_phys_wc_del(par->wc_cookie);
+ if (info->screen_base)
+ iounmap(info->screen_base);
+ if (par->region)
+ release_region(0x3c0, 32);
+ framebuffer_release(info);
+ release_mem_region(vesafb_fix.smem_start, size_total);
+ return err;
+}
+
+static void vesafb_remove(struct platform_device *pdev)
+{
+ struct fb_info *info = platform_get_drvdata(pdev);
+
+ if (((struct vesafb_par *)(info->par))->region)
+ release_region(0x3c0, 32);
+
+ /* vesafb_destroy takes care of info cleanup */
+ unregister_framebuffer(info);
+}
+
+static struct platform_driver vesafb_driver = {
+ .driver = {
+ .name = "vesa-framebuffer",
+ },
+ .probe = vesafb_probe,
+ .remove_new = vesafb_remove,
+};
+
+module_platform_driver(vesafb_driver);
+MODULE_LICENSE("GPL");
generated by cgit v1.2.3 (git 2.39.1) at 2024-11-12 12:48:59 +0000