diff options
Diffstat (limited to 'drivers/video/pmag-ba-fb.c')
| -rw-r--r-- | drivers/video/pmag-ba-fb.c | 182 |
1 files changed, 182 insertions, 0 deletions
diff --git a/drivers/video/pmag-ba-fb.c b/drivers/video/pmag-ba-fb.c new file mode 100644 index 0000000..f809558 --- /dev/null +++ b/drivers/video/pmag-ba-fb.c @@ -0,0 +1,182 @@ +/* + * 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"); |
