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