Add generic/simple framebuffer.
Sponsored by: The FreeBSD Foundation
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280385557c
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324
sys/dev/fb/fbd.c
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324
sys/dev/fb/fbd.c
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/*-
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* Copyright (c) 2013 The FreeBSD Foundation
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* All rights reserved.
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*
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* This software was developed by Aleksandr Rybalko under sponsorship from the
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* FreeBSD Foundation.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* $FreeBSD$
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*/
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/* Generic framebuffer */
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/* TODO unlink from VT(9) */
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/* TODO done normal /dev/fb methods */
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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#include <sys/param.h>
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#include <sys/systm.h>
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#include <sys/conf.h>
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#include <sys/kernel.h>
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#include <sys/malloc.h>
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#include <sys/queue.h>
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#include <sys/fbio.h>
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#include <dev/vt/hw/fb/vt_fb.h>
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LIST_HEAD(fb_list_head_t, fb_list_entry) fb_list_head =
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LIST_HEAD_INITIALIZER(fb_list_head);
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struct fb_list_entry {
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struct fb_info *fb_info;
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struct cdev *fb_si;
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LIST_ENTRY(fb_list_entry) fb_list;
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};
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static void fbd_evh_init(void *);
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/* SI_ORDER_SECOND, just after EVENTHANDLERs initialized. */
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SYSINIT(fbd_evh_init, SI_SUB_CONFIGURE, SI_ORDER_SECOND, fbd_evh_init, NULL);
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static d_open_t fb_open;
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static d_close_t fb_close;
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static d_read_t fb_read;
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static d_write_t fb_write;
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static d_ioctl_t fb_ioctl;
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static d_mmap_t fb_mmap;
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static struct cdevsw fb_cdevsw = {
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.d_version = D_VERSION,
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.d_flags = D_NEEDGIANT,
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.d_open = fb_open,
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.d_close = fb_close,
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.d_read = fb_read,
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.d_write = fb_write,
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.d_ioctl = fb_ioctl,
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.d_mmap = fb_mmap,
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.d_name = "fb",
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};
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static int framebuffer_dev_unit = 0;
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static int
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fb_open(struct cdev *dev, int oflags, int devtype, struct thread *td)
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{
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return (0);
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}
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static int
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fb_close(struct cdev *dev, int fflag, int devtype, struct thread *td)
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{
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return (0);
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}
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static int
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fb_ioctl(struct cdev *dev, u_long cmd, caddr_t data, int fflag,
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struct thread *td)
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{
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return (0);
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}
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static int
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fb_read(struct cdev *dev, struct uio *uio, int ioflag)
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{
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return (0); /* XXX nothing to read, yet */
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}
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static int
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fb_write(struct cdev *dev, struct uio *uio, int ioflag)
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{
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return (0); /* XXX nothing written */
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}
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static int
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fb_mmap(struct cdev *dev, vm_ooffset_t offset, vm_paddr_t *paddr, int nprot,
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vm_memattr_t *memattr)
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{
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struct fb_info *info;
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info = dev->si_drv1;
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if (offset < info->fb_size) {
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*paddr = info->fb_pbase + offset;
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return (0);
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}
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return (EINVAL);
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}
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static void
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vt_fb_mem_wr1(struct fb_info *sc, uint32_t o, uint8_t v)
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{
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KASSERT((o < sc->fb_size), ("Offset %#08x out of fb size", o));
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*(uint8_t *)(sc->fb_vbase + o) = v;
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}
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static void
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vt_fb_mem_wr2(struct fb_info *sc, uint32_t o, uint16_t v)
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{
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KASSERT((o < sc->fb_size), ("Offset %#08x out of fb size", o));
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*(uint16_t *)(sc->fb_vbase + o) = v;
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}
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static void
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vt_fb_mem_wr4(struct fb_info *sc, uint32_t o, uint32_t v)
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{
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KASSERT((o < sc->fb_size), ("Offset %#08x out of fb size", o));
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*(uint32_t *)(sc->fb_vbase + o) = v;
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}
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static void
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vt_fb_indir_wr1(struct fb_info *sc, uint32_t o, uint8_t v)
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{
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KASSERT((o < sc->fb_size), ("Offset %#08x out of fb size", o));
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sc->fb_write(sc->fb_priv, o, &v, 1);
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}
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static void
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vt_fb_indir_wr2(struct fb_info *sc, uint32_t o, uint16_t v)
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{
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KASSERT((o < sc->fb_size), ("Offset %#08x out of fb size", o));
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sc->fb_write(sc->fb_priv, o, &v, 2);
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}
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static void
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vt_fb_indir_wr4(struct fb_info *sc, uint32_t o, uint32_t v)
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{
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KASSERT((o < sc->fb_size), ("Offset %#08x out of fb size", o));
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sc->fb_write(sc->fb_priv, o, &v, 4);
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}
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static int
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fb_probe(struct fb_info *info)
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{
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if (info->fb_size == 0)
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return (ENXIO);
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if (info->fb_write != NULL) {
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if (info->fb_write == NULL) {
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return (EINVAL);
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}
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info->fb_flags |= FB_FLAG_NOMMAP;
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info->wr1 = &vt_fb_indir_wr1;
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info->wr2 = &vt_fb_indir_wr2;
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info->wr4 = &vt_fb_indir_wr4;
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} else if (info->fb_vbase != 0) {
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if (info->fb_pbase == 0)
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info->fb_flags |= FB_FLAG_NOMMAP;
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info->wr1 = &vt_fb_mem_wr1;
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info->wr2 = &vt_fb_mem_wr2;
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info->wr4 = &vt_fb_mem_wr4;
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} else
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return (ENXIO);
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return (0);
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}
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static int
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fb_init(struct fb_list_entry *entry, int unit)
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{
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struct fb_info *info;
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info = entry->fb_info;
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entry->fb_si = make_dev(&fb_cdevsw, unit, UID_ROOT, GID_WHEEL,
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0600, "fb%d", unit);
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entry->fb_si->si_drv1 = info;
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return (0);
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}
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int
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fbd_list()
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{
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struct fb_list_entry *entry;
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if (LIST_EMPTY(&fb_list_head))
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return (ENOENT);
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LIST_FOREACH(entry, &fb_list_head, fb_list) {
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printf("FB %s @%p\n", entry->fb_info->fb_name,
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(void *)entry->fb_info->fb_pbase);
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}
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return (0);
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}
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static struct fb_list_entry *
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fbd_find(struct fb_info* info)
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{
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struct fb_list_entry *entry, *tmp;
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LIST_FOREACH_SAFE(entry, &fb_list_head, fb_list, tmp) {
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if (entry->fb_info == info) {
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return (entry);
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}
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}
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return (NULL);
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}
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int
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fbd_register(struct fb_info* info)
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{
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struct fb_list_entry *entry;
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int err, first;
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first = 0;
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if (LIST_EMPTY(&fb_list_head))
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first++;
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entry = fbd_find(info);
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if (entry != NULL) {
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/* XXX Update framebuffer params */
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return (0);
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}
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err = fb_probe(info);
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if (err)
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return (err);
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entry = malloc(sizeof(struct fb_list_entry), M_DEVBUF, M_WAITOK|M_ZERO);
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entry->fb_info = info;
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LIST_INSERT_HEAD(&fb_list_head, entry, fb_list);
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err = fb_init(entry, framebuffer_dev_unit++);
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if (err)
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return (err);
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if (first)
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vt_fb_attach(info);
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return (0);
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}
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int
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fbd_unregister(struct fb_info* info)
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{
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struct fb_list_entry *entry, *tmp;
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LIST_FOREACH_SAFE(entry, &fb_list_head, fb_list, tmp) {
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if (entry->fb_info == info) {
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LIST_REMOVE(entry, fb_list);
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free(entry, M_DEVBUF);
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return (0);
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}
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}
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return (ENOENT);
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}
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static void
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register_fb_wrap(void *arg, void *ptr)
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{
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fbd_register((struct fb_info *)ptr);
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}
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static void
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unregister_fb_wrap(void *arg, void *ptr)
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{
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fbd_unregister((struct fb_info *)ptr);
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}
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static void
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fbd_evh_init(void *ctx)
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{
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EVENTHANDLER_REGISTER(register_framebuffer, register_fb_wrap, NULL,
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EVENTHANDLER_PRI_ANY);
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EVENTHANDLER_REGISTER(unregister_framebuffer, unregister_fb_wrap, NULL,
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EVENTHANDLER_PRI_ANY);
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}
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