183 строки
4.3 KiB
C
183 строки
4.3 KiB
C
/*
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* linux/drivers/video/pmag-ba-fb.c
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*
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* PMAG-BA TurboChannel framebuffer card support ... derived from:
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* "HP300 Topcat framebuffer support (derived from macfb of all things)
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* Phil Blundell <philb@gnu.org> 1998", the original code can be
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* found in the file hpfb.c in the same directory.
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*
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* Based on digital document:
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* "PMAG-BA TURBOchannel Color Frame Buffer
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* Functional Specification", Revision 1.2, August 27, 1990
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*
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* DECstation related code Copyright (C) 1999, 2000, 2001 by
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* Michael Engel <engel@unix-ag.org>,
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* Karsten Merker <merker@linuxtag.org> and
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* Harald Koerfgen.
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* This file is subject to the terms and conditions of the GNU General
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* Public License. See the file COPYING in the main directory of this
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* archive 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/sched.h>
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#include <linux/errno.h>
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#include <linux/string.h>
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#include <linux/timer.h>
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#include <linux/mm.h>
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#include <linux/tty.h>
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#include <linux/slab.h>
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#include <linux/delay.h>
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#include <linux/init.h>
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#include <linux/fb.h>
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#include <asm/bootinfo.h>
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#include <asm/dec/machtype.h>
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#include <asm/dec/tc.h>
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#include <video/pmag-ba-fb.h>
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struct pmag_ba_ramdac_regs {
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unsigned char addr_low;
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unsigned char pad0[3];
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unsigned char addr_hi;
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unsigned char pad1[3];
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unsigned char data;
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unsigned char pad2[3];
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unsigned char cmap;
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};
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/*
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* Max 3 TURBOchannel slots -> max 3 PMAG-BA :)
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*/
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static struct fb_info pmagba_fb_info[3];
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static struct fb_var_screeninfo pmagbafb_defined = {
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.xres = 1024,
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.yres = 864,
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.xres_virtual = 1024,
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.yres_virtual = 864,
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.bits_per_pixel = 8,
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.red.length = 8,
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.green.length = 8,
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.blue.length = 8,
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.activate = FB_ACTIVATE_NOW,
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.height = 274,
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.width = 195,
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.accel = FB_ACCEL_NONE,
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.vmode = FB_VMODE_NONINTERLACED,
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};
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static struct fb_fix_screeninfo pmagbafb_fix = {
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.id = "PMAG-BA",
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.smem_len = (1024 * 864),
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.type = FB_TYPE_PACKED_PIXELS,
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.visual = FB_VISUAL_PSEUDOCOLOR,
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.line_length = 1024,
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};
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/*
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* Turn hardware cursor off
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*/
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void pmagbafb_erase_cursor(struct pmag_ba_ramdac_regs *bt459_regs)
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{
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bt459_regs->addr_low = 0;
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bt459_regs->addr_hi = 3;
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bt459_regs->data = 0;
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}
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/*
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* Set the palette.
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*/
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static int pmagbafb_setcolreg(unsigned regno, unsigned red, unsigned green,
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unsigned blue, unsigned transp,
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struct fb_info *info)
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{
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struct pmag_ba_ramdac_regs *bt459_regs = (struct pmag_ba_ramdac_regs *) info->par;
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if (regno >= info->cmap.len)
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return 1;
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red >>= 8; /* The cmap fields are 16 bits */
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green >>= 8; /* wide, but the harware colormap */
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blue >>= 8; /* registers are only 8 bits wide */
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bt459_regs->addr_low = (__u8) regno;
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bt459_regs->addr_hi = 0;
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bt459_regs->cmap = red;
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bt459_regs->cmap = green;
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bt459_regs->cmap = blue;
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return 0;
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}
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static struct fb_ops pmagbafb_ops = {
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.owner = THIS_MODULE,
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.fb_get_fix = gen_get_fix,
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.fb_get_var = gen_get_var,
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.fb_setcolreg = pmagbafb_setcolreg,
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.fb_fillrect = cfb_fillrect,
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.fb_copyarea = cfb_copyarea,
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.fb_imageblit = cfb_imageblit,
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.fb_cursor = soft_cursor,
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};
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int __init pmagbafb_init_one(int slot)
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{
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unsigned long base_addr = get_tc_base_addr(slot);
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struct fb_info *info = &pmagba_fb_info[slot];
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struct display *disp = &pmagba_disp[slot];
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printk("PMAG-BA framebuffer in slot %d\n", slot);
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/*
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* Framebuffer display memory base address and friends
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*/
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pmagbafb_fix.smem_start = base_addr + PMAG_BA_ONBOARD_FBMEM_OFFSET;
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info->par = (base_addr + PMAG_BA_BT459_OFFSET);
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/*
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* Configure the Bt459 RAM DAC
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*/
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pmagbafb_erase_cursor((struct pmag_ba_ramdac_regs *) info->par);
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/*
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* Let there be consoles..
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*/
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info->fbops = &pmagbafb_ops;
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info->var = pmagbafb_defined;
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info->fix = pmagbafb_fix;
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info->screen_base = pmagbafb_fix.smem_start;
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info->flags = FBINFO_DEFAULT;
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fb_alloc_cmap(&fb_info.cmap, 256, 0);
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if (register_framebuffer(info) < 0)
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return 1;
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return 0;
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}
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/*
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* Initialise the framebuffer
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*/
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int __init pmagbafb_init(void)
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{
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int sid;
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int found = 0;
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if (fb_get_options("pmagbafb", NULL))
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return -ENODEV;
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if (TURBOCHANNEL) {
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while ((sid = search_tc_card("PMAG-BA")) >= 0) {
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found = 1;
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claim_tc_card(sid);
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pmagbafb_init_one(sid);
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}
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return found ? 0 : -ENODEV;
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} else {
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return -ENODEV;
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}
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}
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module_init(pmagbafb_init);
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MODULE_LICENSE("GPL");
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