--- /dev/null
+/*
+ * linux/drivers/video/hgafb.c -- Hercules graphics adaptor frame buffer device
+ *
+ * Created 25 Nov 1999 by Ferenc Bakonyi (fero@drama.obuda.kando.hu)
+ * Based on skeletonfb.c by Geert Uytterhoeven and
+ * mdacon.c by Andrew Apted
+ *
+ * History:
+ *
+ * - Revision 0.1.8 (23 Oct 2002): Ported to new framebuffer api.
+ *
+ * - Revision 0.1.7 (23 Jan 2001): fix crash resulting from MDA only cards
+ * being detected as Hercules. (Paul G.)
+ * - Revision 0.1.6 (17 Aug 2000): new style structs
+ * documentation
+ * - Revision 0.1.5 (13 Mar 2000): spinlocks instead of saveflags();cli();etc
+ * minor fixes
+ * - Revision 0.1.4 (24 Jan 2000): fixed a bug in hga_card_detect() for
+ * HGA-only systems
+ * - Revision 0.1.3 (22 Jan 2000): modified for the new fb_info structure
+ * screen is cleared after rmmod
+ * virtual resolutions
+ * module parameter 'nologo={0|1}'
+ * the most important: boot logo :)
+ * - Revision 0.1.0 (6 Dec 1999): faster scrolling and minor fixes
+ * - First release (25 Nov 1999)
+ *
+ * This file is subject to the terms and conditions of the GNU General Public
+ * License. See the file COPYING in the main directory of this archive
+ * for more details.
+ */
+
+#include <linux/module.h>
+#include <linux/kernel.h>
+#include <linux/errno.h>
+#include <linux/spinlock.h>
+#include <linux/string.h>
+#include <linux/mm.h>
+#include <linux/delay.h>
+#include <linux/fb.h>
+#include <linux/init.h>
+#include <linux/ioport.h>
+#include <linux/platform_device.h>
+#include <asm/io.h>
+#include <asm/vga.h>
+
+#if 0
+#define DPRINTK(args...) printk(KERN_DEBUG __FILE__": " ##args)
+#else
+#define DPRINTK(args...)
+#endif
+
+#if 0
+#define CHKINFO(ret) if (info != &fb_info) { printk(KERN_DEBUG __FILE__": This should never happen, line:%d \n", __LINE__); return ret; }
+#else
+#define CHKINFO(ret)
+#endif
+
+/* Description of the hardware layout */
+
+static void __iomem *hga_vram; /* Base of video memory */
+static unsigned long hga_vram_len; /* Size of video memory */
+
+#define HGA_ROWADDR(row) ((row%4)*8192 + (row>>2)*90)
+#define HGA_TXT 0
+#define HGA_GFX 1
+
+static inline u8 __iomem * rowaddr(struct fb_info *info, u_int row)
+{
+ return info->screen_base + HGA_ROWADDR(row);
+}
+
+static int hga_mode = -1; /* 0 = txt, 1 = gfx mode */
+
+static enum { TYPE_HERC, TYPE_HERCPLUS, TYPE_HERCCOLOR } hga_type;
+static char *hga_type_name;
+
+#define HGA_INDEX_PORT 0x3b4 /* Register select port */
+#define HGA_VALUE_PORT 0x3b5 /* Register value port */
+#define HGA_MODE_PORT 0x3b8 /* Mode control port */
+#define HGA_STATUS_PORT 0x3ba /* Status and Config port */
+#define HGA_GFX_PORT 0x3bf /* Graphics control port */
+
+/* HGA register values */
+
+#define HGA_CURSOR_BLINKING 0x00
+#define HGA_CURSOR_OFF 0x20
+#define HGA_CURSOR_SLOWBLINK 0x60
+
+#define HGA_MODE_GRAPHICS 0x02
+#define HGA_MODE_VIDEO_EN 0x08
+#define HGA_MODE_BLINK_EN 0x20
+#define HGA_MODE_GFX_PAGE1 0x80
+
+#define HGA_STATUS_HSYNC 0x01
+#define HGA_STATUS_VSYNC 0x80
+#define HGA_STATUS_VIDEO 0x08
+
+#define HGA_CONFIG_COL132 0x08
+#define HGA_GFX_MODE_EN 0x01
+#define HGA_GFX_PAGE_EN 0x02
+
+/* Global locks */
+
+static DEFINE_SPINLOCK(hga_reg_lock);
+
+/* Framebuffer driver structures */
+
+static struct fb_var_screeninfo hga_default_var = {
+ .xres = 720,
+ .yres = 348,
+ .xres_virtual = 720,
+ .yres_virtual = 348,
+ .bits_per_pixel = 1,
+ .red = {0, 1, 0},
+ .green = {0, 1, 0},
+ .blue = {0, 1, 0},
+ .transp = {0, 0, 0},
+ .height = -1,
+ .width = -1,
+};
+
+static struct fb_fix_screeninfo hga_fix = {
+ .id = "HGA",
+ .type = FB_TYPE_PACKED_PIXELS, /* (not sure) */
+ .visual = FB_VISUAL_MONO10,
+ .xpanstep = 8,
+ .ypanstep = 8,
+ .line_length = 90,
+ .accel = FB_ACCEL_NONE
+};
+
+/* Don't assume that tty1 will be the initial current console. */
+static int release_io_port = 0;
+static int release_io_ports = 0;
+static bool nologo = 0;
+
+/* -------------------------------------------------------------------------
+ *
+ * Low level hardware functions
+ *
+ * ------------------------------------------------------------------------- */
+
+static void write_hga_b(unsigned int val, unsigned char reg)
+{
+ outb_p(reg, HGA_INDEX_PORT);
+ outb_p(val, HGA_VALUE_PORT);
+}
+
+static void write_hga_w(unsigned int val, unsigned char reg)
+{
+ outb_p(reg, HGA_INDEX_PORT); outb_p(val >> 8, HGA_VALUE_PORT);
+ outb_p(reg+1, HGA_INDEX_PORT); outb_p(val & 0xff, HGA_VALUE_PORT);
+}
+
+static int test_hga_b(unsigned char val, unsigned char reg)
+{
+ outb_p(reg, HGA_INDEX_PORT);
+ outb (val, HGA_VALUE_PORT);
+ udelay(20); val = (inb_p(HGA_VALUE_PORT) == val);
+ return val;
+}
+
+static void hga_clear_screen(void)
+{
+ unsigned char fillchar = 0xbf; /* magic */
+ unsigned long flags;
+
+ spin_lock_irqsave(&hga_reg_lock, flags);
+ if (hga_mode == HGA_TXT)
+ fillchar = ' ';
+ else if (hga_mode == HGA_GFX)
+ fillchar = 0x00;
+ spin_unlock_irqrestore(&hga_reg_lock, flags);
+ if (fillchar != 0xbf)
+ memset_io(hga_vram, fillchar, hga_vram_len);
+}
+
+static void hga_txt_mode(void)
+{
+ unsigned long flags;
+
+ spin_lock_irqsave(&hga_reg_lock, flags);
+ outb_p(HGA_MODE_VIDEO_EN | HGA_MODE_BLINK_EN, HGA_MODE_PORT);
+ outb_p(0x00, HGA_GFX_PORT);
+ outb_p(0x00, HGA_STATUS_PORT);
+
+ write_hga_b(0x61, 0x00); /* horizontal total */
+ write_hga_b(0x50, 0x01); /* horizontal displayed */
+ write_hga_b(0x52, 0x02); /* horizontal sync pos */
+ write_hga_b(0x0f, 0x03); /* horizontal sync width */
+
+ write_hga_b(0x19, 0x04); /* vertical total */
+ write_hga_b(0x06, 0x05); /* vertical total adjust */
+ write_hga_b(0x19, 0x06); /* vertical displayed */
+ write_hga_b(0x19, 0x07); /* vertical sync pos */
+
+ write_hga_b(0x02, 0x08); /* interlace mode */
+ write_hga_b(0x0d, 0x09); /* maximum scanline */
+ write_hga_b(0x0c, 0x0a); /* cursor start */
+ write_hga_b(0x0d, 0x0b); /* cursor end */
+
+ write_hga_w(0x0000, 0x0c); /* start address */
+ write_hga_w(0x0000, 0x0e); /* cursor location */
+
+ hga_mode = HGA_TXT;
+ spin_unlock_irqrestore(&hga_reg_lock, flags);
+}
+
+static void hga_gfx_mode(void)
+{
+ unsigned long flags;
+
+ spin_lock_irqsave(&hga_reg_lock, flags);
+ outb_p(0x00, HGA_STATUS_PORT);
+ outb_p(HGA_GFX_MODE_EN, HGA_GFX_PORT);
+ outb_p(HGA_MODE_VIDEO_EN | HGA_MODE_GRAPHICS, HGA_MODE_PORT);
+
+ write_hga_b(0x35, 0x00); /* horizontal total */
+ write_hga_b(0x2d, 0x01); /* horizontal displayed */
+ write_hga_b(0x2e, 0x02); /* horizontal sync pos */
+ write_hga_b(0x07, 0x03); /* horizontal sync width */
+
+ write_hga_b(0x5b, 0x04); /* vertical total */
+ write_hga_b(0x02, 0x05); /* vertical total adjust */
+ write_hga_b(0x57, 0x06); /* vertical displayed */
+ write_hga_b(0x57, 0x07); /* vertical sync pos */
+
+ write_hga_b(0x02, 0x08); /* interlace mode */
+ write_hga_b(0x03, 0x09); /* maximum scanline */
+ write_hga_b(0x00, 0x0a); /* cursor start */
+ write_hga_b(0x00, 0x0b); /* cursor end */
+
+ write_hga_w(0x0000, 0x0c); /* start address */
+ write_hga_w(0x0000, 0x0e); /* cursor location */
+
+ hga_mode = HGA_GFX;
+ spin_unlock_irqrestore(&hga_reg_lock, flags);
+}
+
+static void hga_show_logo(struct fb_info *info)
+{
+/*
+ void __iomem *dest = hga_vram;
+ char *logo = linux_logo_bw;
+ int x, y;
+
+ for (y = 134; y < 134 + 80 ; y++) * this needs some cleanup *
+ for (x = 0; x < 10 ; x++)
+ writeb(~*(logo++),(dest + HGA_ROWADDR(y) + x + 40));
+*/
+}
+
+static void hga_pan(unsigned int xoffset, unsigned int yoffset)
+{
+ unsigned int base;
+ unsigned long flags;
+
+ base = (yoffset / 8) * 90 + xoffset;
+ spin_lock_irqsave(&hga_reg_lock, flags);
+ write_hga_w(base, 0x0c); /* start address */
+ spin_unlock_irqrestore(&hga_reg_lock, flags);
+ DPRINTK("hga_pan: base:%d\n", base);
+}
+
+static void hga_blank(int blank_mode)
+{
+ unsigned long flags;
+
+ spin_lock_irqsave(&hga_reg_lock, flags);
+ if (blank_mode) {
+ outb_p(0x00, HGA_MODE_PORT); /* disable video */
+ } else {
+ outb_p(HGA_MODE_VIDEO_EN | HGA_MODE_GRAPHICS, HGA_MODE_PORT);
+ }
+ spin_unlock_irqrestore(&hga_reg_lock, flags);
+}
+
+static int hga_card_detect(void)
+{
+ int count = 0;
+ void __iomem *p, *q;
+ unsigned short p_save, q_save;
+
+ hga_vram_len = 0x08000;
+
+ hga_vram = ioremap(0xb0000, hga_vram_len);
+
+ if (request_region(0x3b0, 12, "hgafb"))
+ release_io_ports = 1;
+ if (request_region(0x3bf, 1, "hgafb"))
+ release_io_port = 1;
+
+ /* do a memory check */
+
+ p = hga_vram;
+ q = hga_vram + 0x01000;
+
+ p_save = readw(p); q_save = readw(q);
+
+ writew(0xaa55, p); if (readw(p) == 0xaa55) count++;
+ writew(0x55aa, p); if (readw(p) == 0x55aa) count++;
+ writew(p_save, p);
+
+ if (count != 2)
+ goto error;
+
+ /* Ok, there is definitely a card registering at the correct
+ * memory location, so now we do an I/O port test.
+ */
+
+ if (!test_hga_b(0x66, 0x0f)) /* cursor low register */
+ goto error;
+
+ if (!test_hga_b(0x99, 0x0f)) /* cursor low register */
+ goto error;
+
+ /* See if the card is a Hercules, by checking whether the vsync
+ * bit of the status register is changing. This test lasts for
+ * approximately 1/10th of a second.
+ */
+
+ p_save = q_save = inb_p(HGA_STATUS_PORT) & HGA_STATUS_VSYNC;
+
+ for (count=0; count < 50000 && p_save == q_save; count++) {
+ q_save = inb(HGA_STATUS_PORT) & HGA_STATUS_VSYNC;
+ udelay(2);
+ }
+
+ if (p_save == q_save)
+ goto error;
+
+ switch (inb_p(HGA_STATUS_PORT) & 0x70) {
+ case 0x10:
+ hga_type = TYPE_HERCPLUS;
+ hga_type_name = "HerculesPlus";
+ break;
+ case 0x50:
+ hga_type = TYPE_HERCCOLOR;
+ hga_type_name = "HerculesColor";
+ break;
+ default:
+ hga_type = TYPE_HERC;
+ hga_type_name = "Hercules";
+ break;
+ }
+ return 1;
+error:
+ if (release_io_ports)
+ release_region(0x3b0, 12);
+ if (release_io_port)
+ release_region(0x3bf, 1);
+ return 0;
+}
+
+/**
+ * hgafb_open - open the framebuffer device
+ * @info:pointer to fb_info object containing info for current hga board
+ * @int:open by console system or userland.
+ */
+
+static int hgafb_open(struct fb_info *info, int init)
+{
+ hga_gfx_mode();
+ hga_clear_screen();
+ if (!nologo) hga_show_logo(info);
+ return 0;
+}
+
+/**
+ * hgafb_open - open the framebuffer device
+ * @info:pointer to fb_info object containing info for current hga board
+ * @int:open by console system or userland.
+ */
+
+static int hgafb_release(struct fb_info *info, int init)
+{
+ hga_txt_mode();
+ hga_clear_screen();
+ return 0;
+}
+
+/**
+ * hgafb_setcolreg - set color registers
+ * @regno:register index to set
+ * @red:red value, unused
+ * @green:green value, unused
+ * @blue:blue value, unused
+ * @transp:transparency value, unused
+ * @info:unused
+ *
+ * This callback function is used to set the color registers of a HGA
+ * board. Since we have only two fixed colors only @regno is checked.
+ * A zero is returned on success and 1 for failure.
+ */
+
+static int hgafb_setcolreg(u_int regno, u_int red, u_int green, u_int blue,
+ u_int transp, struct fb_info *info)
+{
+ if (regno > 1)
+ return 1;
+ return 0;
+}
+
+/**
+ * hga_pan_display - pan or wrap the display
+ * @var:contains new xoffset, yoffset and vmode values
+ * @info:pointer to fb_info object containing info for current hga board
+ *
+ * This function looks only at xoffset, yoffset and the %FB_VMODE_YWRAP
+ * flag in @var. If input parameters are correct it calls hga_pan() to
+ * program the hardware. @info->var is updated to the new values.
+ * A zero is returned on success and %-EINVAL for failure.
+ */
+
+static int hgafb_pan_display(struct fb_var_screeninfo *var,
+ struct fb_info *info)
+{
+ if (var->vmode & FB_VMODE_YWRAP) {
+ if (var->yoffset >= info->var.yres_virtual ||
+ var->xoffset)
+ return -EINVAL;
+ } else {
+ if (var->xoffset + info->var.xres > info->var.xres_virtual
+ || var->yoffset + info->var.yres > info->var.yres_virtual
+ || var->yoffset % 8)
+ return -EINVAL;
+ }
+
+ hga_pan(var->xoffset, var->yoffset);
+ return 0;
+}
+
+/**
+ * hgafb_blank - (un)blank the screen
+ * @blank_mode:blanking method to use
+ * @info:unused
+ *
+ * Blank the screen if blank_mode != 0, else unblank.
+ * Implements VESA suspend and powerdown modes on hardware that supports
+ * disabling hsync/vsync:
+ * @blank_mode == 2 means suspend vsync,
+ * @blank_mode == 3 means suspend hsync,
+ * @blank_mode == 4 means powerdown.
+ */
+
+static int hgafb_blank(int blank_mode, struct fb_info *info)
+{
+ hga_blank(blank_mode);
+ return 0;
+}
+
+/*
+ * Accel functions
+ */
+static void hgafb_fillrect(struct fb_info *info, const struct fb_fillrect *rect)
+{
+ u_int rows, y;
+ u8 __iomem *dest;
+
+ y = rect->dy;
+
+ for (rows = rect->height; rows--; y++) {
+ dest = rowaddr(info, y) + (rect->dx >> 3);
+ switch (rect->rop) {
+ case ROP_COPY:
+ memset_io(dest, rect->color, (rect->width >> 3));
+ break;
+ case ROP_XOR:
+ fb_writeb(~(fb_readb(dest)), dest);
+ break;
+ }
+ }
+}
+
+static void hgafb_copyarea(struct fb_info *info, const struct fb_copyarea *area)
+{
+ u_int rows, y1, y2;
+ u8 __iomem *src;
+ u8 __iomem *dest;
+
+ if (area->dy <= area->sy) {
+ y1 = area->sy;
+ y2 = area->dy;
+
+ for (rows = area->height; rows--; ) {
+ src = rowaddr(info, y1) + (area->sx >> 3);
+ dest = rowaddr(info, y2) + (area->dx >> 3);
+ memmove(dest, src, (area->width >> 3));
+ y1++;
+ y2++;
+ }
+ } else {
+ y1 = area->sy + area->height - 1;
+ y2 = area->dy + area->height - 1;
+
+ for (rows = area->height; rows--;) {
+ src = rowaddr(info, y1) + (area->sx >> 3);
+ dest = rowaddr(info, y2) + (area->dx >> 3);
+ memmove(dest, src, (area->width >> 3));
+ y1--;
+ y2--;
+ }
+ }
+}
+
+static void hgafb_imageblit(struct fb_info *info, const struct fb_image *image)
+{
+ u8 __iomem *dest;
+ u8 *cdat = (u8 *) image->data;
+ u_int rows, y = image->dy;
+ u_int x;
+ u8 d;
+
+ for (rows = image->height; rows--; y++) {
+ for (x = 0; x < image->width; x+= 8) {
+ d = *cdat++;
+ dest = rowaddr(info, y) + ((image->dx + x)>> 3);
+ fb_writeb(d, dest);
+ }
+ }
+}
+
+static struct fb_ops hgafb_ops = {
+ .owner = THIS_MODULE,
+ .fb_open = hgafb_open,
+ .fb_release = hgafb_release,
+ .fb_setcolreg = hgafb_setcolreg,
+ .fb_pan_display = hgafb_pan_display,
+ .fb_blank = hgafb_blank,
+ .fb_fillrect = hgafb_fillrect,
+ .fb_copyarea = hgafb_copyarea,
+ .fb_imageblit = hgafb_imageblit,
+};
+
+/* ------------------------------------------------------------------------- *
+ *
+ * Functions in fb_info
+ *
+ * ------------------------------------------------------------------------- */
+
+/* ------------------------------------------------------------------------- */
+
+ /*
+ * Initialization
+ */
+
+static int hgafb_probe(struct platform_device *pdev)
+{
+ struct fb_info *info;
+
+ if (! hga_card_detect()) {
+ printk(KERN_INFO "hgafb: HGA card not detected.\n");
+ if (hga_vram)
+ iounmap(hga_vram);
+ return -EINVAL;
+ }
+
+ printk(KERN_INFO "hgafb: %s with %ldK of memory detected.\n",
+ hga_type_name, hga_vram_len/1024);
+
+ info = framebuffer_alloc(0, &pdev->dev);
+ if (!info) {
+ iounmap(hga_vram);
+ return -ENOMEM;
+ }
+
+ hga_fix.smem_start = (unsigned long)hga_vram;
+ hga_fix.smem_len = hga_vram_len;
+
+ info->flags = FBINFO_DEFAULT | FBINFO_HWACCEL_YPAN;
+ info->var = hga_default_var;
+ info->fix = hga_fix;
+ info->monspecs.hfmin = 0;
+ info->monspecs.hfmax = 0;
+ info->monspecs.vfmin = 10000;
+ info->monspecs.vfmax = 10000;
+ info->monspecs.dpms = 0;
+ info->fbops = &hgafb_ops;
+ info->screen_base = hga_vram;
+
+ if (register_framebuffer(info) < 0) {
+ framebuffer_release(info);
+ iounmap(hga_vram);
+ return -EINVAL;
+ }
+
+ fb_info(info, "%s frame buffer device\n", info->fix.id);
+ platform_set_drvdata(pdev, info);
+ return 0;
+}
+
+static int hgafb_remove(struct platform_device *pdev)
+{
+ struct fb_info *info = platform_get_drvdata(pdev);
+
+ hga_txt_mode();
+ hga_clear_screen();
+
+ if (info) {
+ unregister_framebuffer(info);
+ framebuffer_release(info);
+ }
+
+ iounmap(hga_vram);
+
+ if (release_io_ports)
+ release_region(0x3b0, 12);
+
+ if (release_io_port)
+ release_region(0x3bf, 1);
+
+ return 0;
+}
+
+static struct platform_driver hgafb_driver = {
+ .probe = hgafb_probe,
+ .remove = hgafb_remove,
+ .driver = {
+ .name = "hgafb",
+ },
+};
+
+static struct platform_device *hgafb_device;
+
+static int __init hgafb_init(void)
+{
+ int ret;
+
+ if (fb_get_options("hgafb", NULL))
+ return -ENODEV;
+
+ ret = platform_driver_register(&hgafb_driver);
+
+ if (!ret) {
+ hgafb_device = platform_device_register_simple("hgafb", 0, NULL, 0);
+
+ if (IS_ERR(hgafb_device)) {
+ platform_driver_unregister(&hgafb_driver);
+ ret = PTR_ERR(hgafb_device);
+ }
+ }
+
+ return ret;
+}
+
+static void __exit hgafb_exit(void)
+{
+ platform_device_unregister(hgafb_device);
+ platform_driver_unregister(&hgafb_driver);
+}
+
+/* -------------------------------------------------------------------------
+ *
+ * Modularization
+ *
+ * ------------------------------------------------------------------------- */
+
+MODULE_AUTHOR("Ferenc Bakonyi (fero@drama.obuda.kando.hu)");
+MODULE_DESCRIPTION("FBDev driver for Hercules Graphics Adaptor");
+MODULE_LICENSE("GPL");
+
+module_param(nologo, bool, 0);
+MODULE_PARM_DESC(nologo, "Disables startup logo if != 0 (default=0)");
+module_init(hgafb_init);
+module_exit(hgafb_exit);
Code Review / kvmfornfv.git / blobdiff