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-rw-r--r--drivers/video/fbdev/sbuslib.c286
1 files changed, 286 insertions, 0 deletions
diff --git a/drivers/video/fbdev/sbuslib.c b/drivers/video/fbdev/sbuslib.c
new file mode 100644
index 0000000000..21e9fd8e69
--- /dev/null
+++ b/drivers/video/fbdev/sbuslib.c
@@ -0,0 +1,286 @@
+// SPDX-License-Identifier: GPL-2.0
+/* sbuslib.c: Helper library for SBUS framebuffer drivers.
+ *
+ * Copyright (C) 2003 David S. Miller (davem@redhat.com)
+ */
+
+#include <linux/compat.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/string.h>
+#include <linux/fb.h>
+#include <linux/mm.h>
+#include <linux/uaccess.h>
+#include <linux/of.h>
+
+#include <asm/fbio.h>
+
+#include "sbuslib.h"
+
+void sbusfb_fill_var(struct fb_var_screeninfo *var, struct device_node *dp,
+ int bpp)
+{
+ memset(var, 0, sizeof(*var));
+
+ var->xres = of_getintprop_default(dp, "width", 1152);
+ var->yres = of_getintprop_default(dp, "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;
+
+ if (!(vma->vm_flags & (VM_SHARED | VM_MAYSHARE)))
+ return -EINVAL;
+
+ size = vma->vm_end - vma->vm_start;
+ if (vma->vm_pgoff > (~0UL >> PAGE_SHIFT))
+ return -EINVAL;
+
+ off = vma->vm_pgoff << PAGE_SHIFT;
+
+ /* VM_IO | VM_DONTEXPAND | VM_DONTDUMP are set by remap_pfn_range() */
+
+ vma->vm_page_prot = pgprot_noncached(vma->vm_page_prot);
+
+ /* 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;
+ unsigned 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;
+ unsigned 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 > cmap->len || count > cmap->len - index)
+ 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);
+
+#ifdef CONFIG_COMPAT
+int sbusfb_compat_ioctl(struct fb_info *info, unsigned int cmd, unsigned long arg)
+{
+ switch (cmd) {
+ case FBIOGTYPE:
+ case FBIOSATTR:
+ case FBIOGATTR:
+ case FBIOSVIDEO:
+ case FBIOGVIDEO:
+ case FBIOSCURSOR32:
+ case FBIOGCURSOR32: /* This is not implemented yet.
+ Later it should be converted... */
+ case FBIOSCURPOS:
+ case FBIOGCURPOS:
+ case FBIOGCURMAX:
+ return info->fbops->fb_ioctl(info, cmd, arg);
+ case FBIOPUTCMAP32:
+ case FBIOPUTCMAP_SPARC: {
+ struct fbcmap32 c;
+ struct fb_cmap cmap;
+ u16 red, green, blue;
+ u8 red8, green8, blue8;
+ unsigned char __user *ured;
+ unsigned char __user *ugreen;
+ unsigned char __user *ublue;
+ unsigned int i;
+
+ if (copy_from_user(&c, compat_ptr(arg), sizeof(c)))
+ return -EFAULT;
+ ured = compat_ptr(c.red);
+ ugreen = compat_ptr(c.green);
+ ublue = compat_ptr(c.blue);
+
+ cmap.len = 1;
+ cmap.red = &red;
+ cmap.green = &green;
+ cmap.blue = &blue;
+ cmap.transp = NULL;
+ for (i = 0; i < c.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 = c.index + i;
+ err = fb_set_cmap(&cmap, info);
+ if (err)
+ return err;
+ }
+ return 0;
+ }
+ case FBIOGETCMAP32: {
+ struct fbcmap32 c;
+ unsigned char __user *ured;
+ unsigned char __user *ugreen;
+ unsigned char __user *ublue;
+ struct fb_cmap *cmap = &info->cmap;
+ unsigned int index, i;
+ u8 red, green, blue;
+
+ if (copy_from_user(&c, compat_ptr(arg), sizeof(c)))
+ return -EFAULT;
+ index = c.index;
+ ured = compat_ptr(c.red);
+ ugreen = compat_ptr(c.green);
+ ublue = compat_ptr(c.blue);
+
+ if (index > cmap->len || c.count > cmap->len - index)
+ return -EINVAL;
+
+ for (i = 0; i < c.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 -ENOIOCTLCMD;
+ }
+}
+EXPORT_SYMBOL(sbusfb_compat_ioctl);
+#endif
generated by cgit v1.2.3 (git 2.39.1) at 2024-11-12 14:40:41 +0000