Module Name: src Committed By: jmcneill Date: Sun Aug 27 19:14:32 UTC 2017
Added Files: src/sys/dev/fdt: simplefb.c Log Message: Add an FDT "Simple Framebuffer" driver. This lets us take over framebuffers configured by U-Boot without any knowledge of the underlying hardware. To generate a diff of this commit: cvs rdiff -u -r0 -r1.1 src/sys/dev/fdt/simplefb.c Please note that diffs are not public domain; they are subject to the copyright notices on the relevant files.
Added files: Index: src/sys/dev/fdt/simplefb.c diff -u /dev/null src/sys/dev/fdt/simplefb.c:1.1 --- /dev/null Sun Aug 27 19:14:32 2017 +++ src/sys/dev/fdt/simplefb.c Sun Aug 27 19:14:32 2017 @@ -0,0 +1,209 @@ +/* $NetBSD: simplefb.c,v 1.1 2017/08/27 19:14:32 jmcneill Exp $ */ + +/*- + * Copyright (c) 2017 Jared McNeill <jmcne...@invisible.ca> + * All rights reserved. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions + * are met: + * 1. Redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer. + * 2. Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in the + * documentation and/or other materials provided with the distribution. + * + * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR + * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES + * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. + * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, + * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, + * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; + * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED + * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, + * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY + * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF + * SUCH DAMAGE. + */ + +#include <sys/cdefs.h> +__KERNEL_RCSID(0, "$NetBSD: simplefb.c,v 1.1 2017/08/27 19:14:32 jmcneill Exp $"); + +#include <sys/param.h> +#include <sys/bus.h> +#include <sys/device.h> +#include <sys/systm.h> + +#include <dev/fdt/fdtvar.h> + +#include <dev/wsfb/genfbvar.h> + +static const char * const compatible[] = { + "simple-framebuffer", + NULL +}; + +struct simplefb_softc { + struct genfb_softc sc_gen; + bus_space_tag_t sc_bst; + bus_space_handle_t sc_bsh; + int sc_phandle; + + bus_addr_t sc_paddr; +}; + +static bool +simplefb_shutdown(device_t self, int flags) +{ + genfb_enable_polling(self); + return true; +} + +static int +simplefb_ioctl(void *v, void *vs, u_long cmd, void *data, int flag, lwp_t *l) +{ + struct simplefb_softc * const sc = v; + struct wsdisplayio_bus_id *busid; + struct wsdisplayio_fbinfo *fbi; + struct rasops_info *ri; + int error; + + switch (cmd) { + case WSDISPLAYIO_GTYPE: + *(u_int *)data = WSDISPLAY_TYPE_GENFB; + return 0; + case WSDISPLAYIO_GET_BUSID: + busid = data; + busid->bus_type = WSDISPLAYIO_BUS_SOC; + return 0; + case WSDISPLAYIO_GET_FBINFO: + fbi = data; + ri = &sc->sc_gen.vd.active->scr_ri; + error = wsdisplayio_get_fbinfo(ri, fbi); + if (error == 0) + fbi->fbi_flags |= WSFB_VRAM_IS_RAM; + return error; + default: + return EPASSTHROUGH; + } +} + +static paddr_t +simplefb_mmap(void *v, void *vs, off_t off, int prot) +{ + struct simplefb_softc * const sc = v; + + if (off < 0 || off >= sc->sc_gen.sc_fbsize) + return -1; + + return bus_space_mmap(sc->sc_bst, sc->sc_paddr, off, prot, + BUS_SPACE_MAP_LINEAR | BUS_SPACE_MAP_PREFETCHABLE); +} + +static int +simplefb_attach_genfb(struct simplefb_softc *sc) +{ + device_t dev = sc->sc_gen.sc_dev; + prop_dictionary_t dict = device_properties(dev); + const int phandle = sc->sc_phandle; + struct genfb_ops ops; + uint32_t width, height, stride; + uint16_t depth; + const char *format; + bus_addr_t addr; + bus_size_t size; + + if (fdtbus_get_reg(phandle, 0, &addr, &size) != 0) { + aprint_error(": couldn't get registers\n"); + return ENXIO; + } + + if (of_getprop_uint32(phandle, "width", &width) != 0 || + of_getprop_uint32(phandle, "height", &height) != 0 || + of_getprop_uint32(phandle, "stride", &stride) != 0 || + (format = fdtbus_get_string(phandle, "format")) == NULL) { + aprint_error(": missing property in DT\n"); + return ENXIO; + } + + if (strcmp(format, "a8b8g8r8") == 0 || + strcmp(format, "x8r8g8b8") == 0) { + depth = 32; + } else if (strcmp(format, "r5g6b5") == 0) { + depth = 16; + } else { + aprint_error(": unsupported format '%s'\n", format); + return ENXIO; + } + + if (bus_space_map(sc->sc_bst, addr, size, BUS_SPACE_MAP_LINEAR, + &sc->sc_bsh) != 0) { + aprint_error(": failed to map fb\n"); + return ENXIO; + } + + sc->sc_paddr = addr; + + prop_dictionary_set_uint32(dict, "width", width); + prop_dictionary_set_uint32(dict, "height", height); + prop_dictionary_set_uint8(dict, "depth", depth); + prop_dictionary_set_uint16(dict, "linebytes", stride); + prop_dictionary_set_uint32(dict, "address", addr); + prop_dictionary_set_uint32(dict, "virtual_address", + (uintptr_t)bus_space_vaddr(sc->sc_bst, sc->sc_bsh)); + + genfb_init(&sc->sc_gen); + + if (sc->sc_gen.sc_width == 0 || sc->sc_gen.sc_fbsize == 0) { + aprint_normal(": disabled\n"); + return ENXIO; + } + + aprint_naive("\n"); + aprint_normal(": Simple Framebuffer (%ux%u %u-bpp @ 0x%" PRIxBUSADDR ")\n", + width, height, depth, addr); + + pmf_device_register1(dev, NULL, NULL, simplefb_shutdown); + + memset(&ops, 0, sizeof(ops)); + ops.genfb_ioctl = simplefb_ioctl; + ops.genfb_mmap = simplefb_mmap; + + bool is_console = false; + prop_dictionary_get_bool(dict, "is_console", &is_console); + prop_dictionary_set_bool(dict, "is_console", is_console); + + if (is_console) + aprint_normal_dev(sc->sc_gen.sc_dev, + "switching to framebuffer console\n"); + + genfb_attach(&sc->sc_gen, &ops); + + return 0; +} + +static int +simplefb_match(device_t parent, cfdata_t cf, void *aux) +{ + struct fdt_attach_args * const faa = aux; + + return of_match_compatible(faa->faa_phandle, compatible); +} + +static void +simplefb_attach(device_t parent, device_t self, void *aux) +{ + struct simplefb_softc * const sc = device_private(self); + struct fdt_attach_args * const faa = aux; + const int phandle = faa->faa_phandle; + + sc->sc_gen.sc_dev = self; + sc->sc_phandle = phandle; + sc->sc_bst = faa->faa_bst; + + if (simplefb_attach_genfb(sc) != 0) + return; +} + +CFATTACH_DECL_NEW(simplefb, sizeof(struct simplefb_softc), + simplefb_match, simplefb_attach, NULL, NULL);