[src/trunk]: src/sys/dev/fdt Add an FDT "Simple Framebuffer" driver. This let...

[jmcneill <jmcneill%NetBSD.org@localhost>]

details:   https://anonhg.NetBSD.org/src/rev/26f056d312a8
branches:  trunk
changeset: 826309:26f056d312a8
user:      jmcneill <jmcneill%NetBSD.org@localhost>
date:      Sun Aug 27 19:14:32 2017 +0000

description:
Add an FDT "Simple Framebuffer" driver. This lets us take over framebuffers
configured by U-Boot without any knowledge of the underlying hardware.

diffstat:

 sys/dev/fdt/simplefb.c |  209 +++++++++++++++++++++++++++++++++++++++++++++++++
 1 files changed, 209 insertions(+), 0 deletions(-)

diffs (213 lines):

diff -r 5739de734c62 -r 26f056d312a8 sys/dev/fdt/simplefb.c
--- /dev/null   Thu Jan 01 00:00:00 1970 +0000
+++ b/sys/dev/fdt/simplefb.c    Sun Aug 27 19:14:32 2017 +0000
@@ -0,0 +1,209 @@
+/* $NetBSD: simplefb.c,v 1.1 2017/08/27 19:14:32 jmcneill Exp $ */
+
+/*-
+ * Copyright (c) 2017 Jared McNeill <jmcneill%invisible.ca@localhost>
+ * 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);