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);
