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