Add an FDT "Simple Framebuffer" driver. This lets us take over framebuffers
configured by U-Boot without any knowledge of the underlying hardware.
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jmcneill
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/* $NetBSD: simplefb.c,v 1.1 2017/08/27 19:14:32 jmcneill Exp $ */
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/*-
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* Copyright (c) 2017 Jared McNeill <jmcneill@invisible.ca>
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* All rights reserved.
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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 ``AS IS'' AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
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* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
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* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
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* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
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* 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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#include <sys/cdefs.h>
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__KERNEL_RCSID(0, "$NetBSD: simplefb.c,v 1.1 2017/08/27 19:14:32 jmcneill Exp $");
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#include <sys/param.h>
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#include <sys/bus.h>
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#include <sys/device.h>
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#include <sys/systm.h>
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#include <dev/fdt/fdtvar.h>
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#include <dev/wsfb/genfbvar.h>
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static const char * const compatible[] = {
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"simple-framebuffer",
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NULL
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};
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struct simplefb_softc {
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struct genfb_softc sc_gen;
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bus_space_tag_t sc_bst;
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bus_space_handle_t sc_bsh;
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int sc_phandle;
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bus_addr_t sc_paddr;
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};
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static bool
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simplefb_shutdown(device_t self, int flags)
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{
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genfb_enable_polling(self);
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return true;
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}
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static int
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simplefb_ioctl(void *v, void *vs, u_long cmd, void *data, int flag, lwp_t *l)
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{
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struct simplefb_softc * const sc = v;
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struct wsdisplayio_bus_id *busid;
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struct wsdisplayio_fbinfo *fbi;
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struct rasops_info *ri;
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int error;
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switch (cmd) {
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case WSDISPLAYIO_GTYPE:
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*(u_int *)data = WSDISPLAY_TYPE_GENFB;
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return 0;
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case WSDISPLAYIO_GET_BUSID:
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busid = data;
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busid->bus_type = WSDISPLAYIO_BUS_SOC;
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return 0;
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case WSDISPLAYIO_GET_FBINFO:
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fbi = data;
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ri = &sc->sc_gen.vd.active->scr_ri;
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error = wsdisplayio_get_fbinfo(ri, fbi);
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if (error == 0)
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fbi->fbi_flags |= WSFB_VRAM_IS_RAM;
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return error;
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default:
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return EPASSTHROUGH;
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}
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}
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static paddr_t
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simplefb_mmap(void *v, void *vs, off_t off, int prot)
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{
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struct simplefb_softc * const sc = v;
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if (off < 0 || off >= sc->sc_gen.sc_fbsize)
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return -1;
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return bus_space_mmap(sc->sc_bst, sc->sc_paddr, off, prot,
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BUS_SPACE_MAP_LINEAR | BUS_SPACE_MAP_PREFETCHABLE);
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}
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static int
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simplefb_attach_genfb(struct simplefb_softc *sc)
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{
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device_t dev = sc->sc_gen.sc_dev;
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prop_dictionary_t dict = device_properties(dev);
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const int phandle = sc->sc_phandle;
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struct genfb_ops ops;
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uint32_t width, height, stride;
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uint16_t depth;
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const char *format;
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bus_addr_t addr;
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bus_size_t size;
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if (fdtbus_get_reg(phandle, 0, &addr, &size) != 0) {
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aprint_error(": couldn't get registers\n");
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return ENXIO;
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}
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if (of_getprop_uint32(phandle, "width", &width) != 0 ||
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of_getprop_uint32(phandle, "height", &height) != 0 ||
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of_getprop_uint32(phandle, "stride", &stride) != 0 ||
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(format = fdtbus_get_string(phandle, "format")) == NULL) {
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aprint_error(": missing property in DT\n");
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return ENXIO;
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}
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if (strcmp(format, "a8b8g8r8") == 0 ||
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strcmp(format, "x8r8g8b8") == 0) {
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depth = 32;
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} else if (strcmp(format, "r5g6b5") == 0) {
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depth = 16;
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} else {
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aprint_error(": unsupported format '%s'\n", format);
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return ENXIO;
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}
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if (bus_space_map(sc->sc_bst, addr, size, BUS_SPACE_MAP_LINEAR,
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&sc->sc_bsh) != 0) {
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aprint_error(": failed to map fb\n");
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return ENXIO;
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}
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sc->sc_paddr = addr;
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prop_dictionary_set_uint32(dict, "width", width);
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prop_dictionary_set_uint32(dict, "height", height);
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prop_dictionary_set_uint8(dict, "depth", depth);
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prop_dictionary_set_uint16(dict, "linebytes", stride);
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prop_dictionary_set_uint32(dict, "address", addr);
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prop_dictionary_set_uint32(dict, "virtual_address",
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(uintptr_t)bus_space_vaddr(sc->sc_bst, sc->sc_bsh));
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genfb_init(&sc->sc_gen);
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if (sc->sc_gen.sc_width == 0 || sc->sc_gen.sc_fbsize == 0) {
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aprint_normal(": disabled\n");
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return ENXIO;
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}
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aprint_naive("\n");
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aprint_normal(": Simple Framebuffer (%ux%u %u-bpp @ 0x%" PRIxBUSADDR ")\n",
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width, height, depth, addr);
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pmf_device_register1(dev, NULL, NULL, simplefb_shutdown);
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memset(&ops, 0, sizeof(ops));
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ops.genfb_ioctl = simplefb_ioctl;
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ops.genfb_mmap = simplefb_mmap;
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bool is_console = false;
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prop_dictionary_get_bool(dict, "is_console", &is_console);
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prop_dictionary_set_bool(dict, "is_console", is_console);
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if (is_console)
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aprint_normal_dev(sc->sc_gen.sc_dev,
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"switching to framebuffer console\n");
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genfb_attach(&sc->sc_gen, &ops);
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return 0;
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}
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static int
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simplefb_match(device_t parent, cfdata_t cf, void *aux)
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{
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struct fdt_attach_args * const faa = aux;
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return of_match_compatible(faa->faa_phandle, compatible);
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}
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static void
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simplefb_attach(device_t parent, device_t self, void *aux)
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{
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struct simplefb_softc * const sc = device_private(self);
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struct fdt_attach_args * const faa = aux;
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const int phandle = faa->faa_phandle;
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sc->sc_gen.sc_dev = self;
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sc->sc_phandle = phandle;
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sc->sc_bst = faa->faa_bst;
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if (simplefb_attach_genfb(sc) != 0)
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return;
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}
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CFATTACH_DECL_NEW(simplefb, sizeof(struct simplefb_softc),
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simplefb_match, simplefb_attach, NULL, NULL);
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