diff options
Diffstat (limited to 'drivers/video/fbdev/maxinefb.c')
| -rw-r--r-- | drivers/video/fbdev/maxinefb.c | 174 |
1 files changed, 174 insertions, 0 deletions
diff --git a/drivers/video/fbdev/maxinefb.c b/drivers/video/fbdev/maxinefb.c new file mode 100644 index 0000000000..52528eb4df --- /dev/null +++ b/drivers/video/fbdev/maxinefb.c @@ -0,0 +1,174 @@ +/* + * linux/drivers/video/maxinefb.c + * + * DECstation 5000/xx onboard framebuffer 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. + * + * DECstation related code Copyright (C) 1999,2000,2001 by + * Michael Engel <engel@unix-ag.org> and + * Karsten Merker <merker@linuxtag.org>. + * 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. + * + */ + +/* + * Changes: + * 2001/01/27 removed debugging and testing code, fixed fb_ops + * initialization which had caused a crash before, + * general cleanup, first official release (KM) + * + */ + +#include <linux/module.h> +#include <linux/kernel.h> +#include <linux/errno.h> +#include <linux/string.h> +#include <linux/mm.h> +#include <linux/delay.h> +#include <linux/init.h> +#include <linux/fb.h> +#include <video/maxinefb.h> + +/* bootinfo.h defines the machine type values, needed when checking */ +/* whether are really running on a maxine, KM */ +#include <asm/bootinfo.h> + +static struct fb_info fb_info; + +static const struct fb_var_screeninfo maxinefb_defined = { + .xres = 1024, + .yres = 768, + .xres_virtual = 1024, + .yres_virtual = 768, + .bits_per_pixel =8, + .activate = FB_ACTIVATE_NOW, + .height = -1, + .width = -1, + .vmode = FB_VMODE_NONINTERLACED, +}; + +static struct fb_fix_screeninfo maxinefb_fix __initdata = { + .id = "Maxine", + .smem_len = (1024*768), + .type = FB_TYPE_PACKED_PIXELS, + .visual = FB_VISUAL_PSEUDOCOLOR, + .line_length = 1024, +}; + +/* Handle the funny Inmos RamDAC/video controller ... */ + +void maxinefb_ims332_write_register(int regno, register unsigned int val) +{ + register unsigned char *regs = (char *) MAXINEFB_IMS332_ADDRESS; + unsigned char *wptr; + + wptr = regs + 0xa0000 + (regno << 4); + *((volatile unsigned int *) (regs)) = (val >> 8) & 0xff00; + *((volatile unsigned short *) (wptr)) = val; +} + +unsigned int maxinefb_ims332_read_register(int regno) +{ + register unsigned char *regs = (char *) MAXINEFB_IMS332_ADDRESS; + unsigned char *rptr; + register unsigned int j, k; + + rptr = regs + 0x80000 + (regno << 4); + j = *((volatile unsigned short *) rptr); + k = *((volatile unsigned short *) regs); + + return (j & 0xffff) | ((k & 0xff00) << 8); +} + +/* Set the palette */ +static int maxinefb_setcolreg(unsigned regno, unsigned red, unsigned green, + unsigned blue, unsigned transp, struct fb_info *info) +{ + /* value to be written into the palette reg. */ + unsigned long hw_colorvalue = 0; + + if (regno > 255) + 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 */ + + hw_colorvalue = (blue << 16) + (green << 8) + (red); + + maxinefb_ims332_write_register(IMS332_REG_COLOR_PALETTE + regno, + hw_colorvalue); + return 0; +} + +static const struct fb_ops maxinefb_ops = { + .owner = THIS_MODULE, + FB_DEFAULT_IOMEM_OPS, + .fb_setcolreg = maxinefb_setcolreg, +}; + +int __init maxinefb_init(void) +{ + unsigned long fboff; + unsigned long fb_start; + int i; + + if (fb_get_options("maxinefb", NULL)) + return -ENODEV; + + /* Validate we're on the proper machine type */ + if (mips_machtype != MACH_DS5000_XX) { + return -EINVAL; + } + + printk(KERN_INFO "Maxinefb: Personal DECstation detected\n"); + printk(KERN_INFO "Maxinefb: initializing onboard framebuffer\n"); + + /* Framebuffer display memory base address */ + fb_start = DS5000_xx_ONBOARD_FBMEM_START; + + /* Clear screen */ + for (fboff = fb_start; fboff < fb_start + 0x1ffff; fboff++) + *(volatile unsigned char *)fboff = 0x0; + + maxinefb_fix.smem_start = fb_start; + + /* erase hardware cursor */ + for (i = 0; i < 512; i++) { + maxinefb_ims332_write_register(IMS332_REG_CURSOR_RAM + i, + 0); + /* + if (i&0x8 == 0) + maxinefb_ims332_write_register (IMS332_REG_CURSOR_RAM + i, 0x0f); + else + maxinefb_ims332_write_register (IMS332_REG_CURSOR_RAM + i, 0xf0); + */ + } + + fb_info.fbops = &maxinefb_ops; + fb_info.screen_base = (char *)maxinefb_fix.smem_start; + fb_info.var = maxinefb_defined; + fb_info.fix = maxinefb_fix; + + fb_alloc_cmap(&fb_info.cmap, 256, 0); + + if (register_framebuffer(&fb_info) < 0) + return 1; + return 0; +} + +static void __exit maxinefb_exit(void) +{ + unregister_framebuffer(&fb_info); +} + +#ifdef MODULE +MODULE_LICENSE("GPL"); +#endif +module_init(maxinefb_init); +module_exit(maxinefb_exit); + |