diff options
Diffstat (limited to 'drivers/video/sbuslib.c')
| -rw-r--r-- | drivers/video/sbuslib.c | 184 |
1 files changed, 184 insertions, 0 deletions
diff --git a/drivers/video/sbuslib.c b/drivers/video/sbuslib.c new file mode 100644 index 00000000000..34f72edba82 --- /dev/null +++ b/drivers/video/sbuslib.c @@ -0,0 +1,184 @@ +/* sbuslib.c: Helper library for SBUS framebuffer drivers. + * + * Copyright (C) 2003 David S. Miller (davem@redhat.com) + */ + +#include <linux/kernel.h> +#include <linux/module.h> +#include <linux/string.h> +#include <linux/fb.h> +#include <linux/mm.h> + +#include <asm/oplib.h> +#include <asm/fbio.h> + +#include "sbuslib.h" + +void sbusfb_fill_var(struct fb_var_screeninfo *var, int prom_node, int bpp) +{ + memset(var, 0, sizeof(*var)); + + var->xres = prom_getintdefault(prom_node, "width", 1152); + var->yres = prom_getintdefault(prom_node, "height", 900); + var->xres_virtual = var->xres; + var->yres_virtual = var->yres; + var->bits_per_pixel = bpp; +} + +EXPORT_SYMBOL(sbusfb_fill_var); + +static unsigned long sbusfb_mmapsize(long size, unsigned long fbsize) +{ + if (size == SBUS_MMAP_EMPTY) return 0; + if (size >= 0) return size; + return fbsize * (-size); +} + +int sbusfb_mmap_helper(struct sbus_mmap_map *map, + unsigned long physbase, + unsigned long fbsize, + unsigned long iospace, + struct vm_area_struct *vma) +{ + unsigned int size, page, r, map_size; + unsigned long map_offset = 0; + unsigned long off; + int i; + + size = vma->vm_end - vma->vm_start; + if (vma->vm_pgoff > (~0UL >> PAGE_SHIFT)) + return -EINVAL; + + off = vma->vm_pgoff << PAGE_SHIFT; + + /* To stop the swapper from even considering these pages */ + vma->vm_flags |= (VM_IO | VM_RESERVED); + + /* Each page, see which map applies */ + for (page = 0; page < size; ){ + map_size = 0; + for (i = 0; map[i].size; i++) + if (map[i].voff == off+page) { + map_size = sbusfb_mmapsize(map[i].size, fbsize); +#ifdef __sparc_v9__ +#define POFF_MASK (PAGE_MASK|0x1UL) +#else +#define POFF_MASK (PAGE_MASK) +#endif + map_offset = (physbase + map[i].poff) & POFF_MASK; + break; + } + if (!map_size){ + page += PAGE_SIZE; + continue; + } + if (page + map_size > size) + map_size = size - page; + r = io_remap_pfn_range(vma, + vma->vm_start + page, + MK_IOSPACE_PFN(iospace, + map_offset >> PAGE_SHIFT), + map_size, + vma->vm_page_prot); + if (r) + return -EAGAIN; + page += map_size; + } + + return 0; +} +EXPORT_SYMBOL(sbusfb_mmap_helper); + +int sbusfb_ioctl_helper(unsigned long cmd, unsigned long arg, + struct fb_info *info, + int type, int fb_depth, unsigned long fb_size) +{ + switch(cmd) { + case FBIOGTYPE: { + struct fbtype __user *f = (struct fbtype __user *) arg; + + if (put_user(type, &f->fb_type) || + __put_user(info->var.yres, &f->fb_height) || + __put_user(info->var.xres, &f->fb_width) || + __put_user(fb_depth, &f->fb_depth) || + __put_user(0, &f->fb_cmsize) || + __put_user(fb_size, &f->fb_cmsize)) + return -EFAULT; + return 0; + } + case FBIOPUTCMAP_SPARC: { + struct fbcmap __user *c = (struct fbcmap __user *) arg; + struct fb_cmap cmap; + u16 red, green, blue; + u8 red8, green8, blue8; + unsigned char __user *ured; + unsigned char __user *ugreen; + unsigned char __user *ublue; + int index, count, i; + + if (get_user(index, &c->index) || + __get_user(count, &c->count) || + __get_user(ured, &c->red) || + __get_user(ugreen, &c->green) || + __get_user(ublue, &c->blue)) + return -EFAULT; + + cmap.len = 1; + cmap.red = &red; + cmap.green = &green; + cmap.blue = &blue; + cmap.transp = NULL; + for (i = 0; i < count; i++) { + int err; + + if (get_user(red8, &ured[i]) || + get_user(green8, &ugreen[i]) || + get_user(blue8, &ublue[i])) + return -EFAULT; + + red = red8 << 8; + green = green8 << 8; + blue = blue8 << 8; + + cmap.start = index + i; + err = fb_set_cmap(&cmap, info); + if (err) + return err; + } + return 0; + } + case FBIOGETCMAP_SPARC: { + struct fbcmap __user *c = (struct fbcmap __user *) arg; + unsigned char __user *ured; + unsigned char __user *ugreen; + unsigned char __user *ublue; + struct fb_cmap *cmap = &info->cmap; + int index, count, i; + u8 red, green, blue; + + if (get_user(index, &c->index) || + __get_user(count, &c->count) || + __get_user(ured, &c->red) || + __get_user(ugreen, &c->green) || + __get_user(ublue, &c->blue)) + return -EFAULT; + + if (index + count > cmap->len) + return -EINVAL; + + for (i = 0; i < count; i++) { + red = cmap->red[index + i] >> 8; + green = cmap->green[index + i] >> 8; + blue = cmap->blue[index + i] >> 8; + if (put_user(red, &ured[i]) || + put_user(green, &ugreen[i]) || + put_user(blue, &ublue[i])) + return -EFAULT; + } + return 0; + } + default: + return -EINVAL; + }; +} +EXPORT_SYMBOL(sbusfb_ioctl_helper); |