FDT(4): Import from FreeBSD

1 files changed, 246 insertions, 0 deletions

diff --git a/freebsd/sys/dev/ofw/ofw_subr.c b/freebsd/sys/dev/ofw/ofw_subr.c
new file mode 100644
index 00000000..391d25c4
--- /dev/null
+++ b/freebsd/sys/dev/ofw/ofw_subr.c
@@ -0,0 +1,246 @@
+#include <machine/rtems-bsd-kernel-space.h>
+
+/*-
+ * Copyright (c) 2015 Ian Lepore <ian@freebsd.org>
+ * 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 AND CONTRIBUTORS ``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 OR CONTRIBUTORS 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.
+ *
+ * The initial ofw_reg_to_paddr() implementation has been copied from powerpc
+ * ofw_machdep.c OF_decode_addr(). It was added by Marcel Moolenaar, who did not
+ * assert copyright with the addition but still deserves credit for the work.
+ */
+
+#include <sys/cdefs.h>
+__FBSDID("$FreeBSD$");
+
+#include <rtems/bsd/sys/param.h>
+#include <sys/bus.h>
+#include <sys/libkern.h>
+#include <sys/reboot.h>
+#include <sys/rman.h>
+
+#include <machine/bus.h>
+
+#include <dev/ofw/openfirm.h>
+#include <dev/ofw/ofw_pci.h>
+#include <dev/ofw/ofw_subr.h>
+
+static void
+get_addr_props(phandle_t node, uint32_t *addrp, uint32_t *sizep, int *pcip)
+{
+	char type[64];
+	uint32_t addr, size;
+	int pci, res;
+
+	res = OF_getencprop(node, "#address-cells", &addr, sizeof(addr));
+	if (res == -1)
+		addr = 2;
+	res = OF_getencprop(node, "#size-cells", &size, sizeof(size));
+	if (res == -1)
+		size = 1;
+	pci = 0;
+	if (addr == 3 && size == 2) {
+		res = OF_getprop(node, "device_type", type, sizeof(type));
+		if (res != -1) {
+			type[sizeof(type) - 1] = '\0';
+			pci = (strcmp(type, "pci") == 0) ? 1 : 0;
+		}
+	}
+	if (addrp != NULL)
+		*addrp = addr;
+	if (sizep != NULL)
+		*sizep = size;
+	if (pcip != NULL)
+		*pcip = pci;
+}
+
+int
+ofw_reg_to_paddr(phandle_t dev, int regno, bus_addr_t *paddr,
+    bus_size_t *psize, pcell_t *ppci_hi)
+{
+	pcell_t cell[32], pci_hi;
+	uint64_t addr, raddr, baddr;
+	uint64_t size, rsize;
+	uint32_t c, nbridge, naddr, nsize;
+	phandle_t bridge, parent;
+	u_int spc, rspc;
+	int pci, pcib, res;
+
+	/* Sanity checking. */
+	if (dev == 0)
+		return (EINVAL);
+	bridge = OF_parent(dev);
+	if (bridge == 0)
+		return (EINVAL);
+	if (regno < 0)
+		return (EINVAL);
+	if (paddr == NULL || psize == NULL)
+		return (EINVAL);
+
+	get_addr_props(bridge, &naddr, &nsize, &pci);
+	res = OF_getencprop(dev, (pci) ? "assigned-addresses" : "reg",
+	    cell, sizeof(cell));
+	if (res == -1)
+		return (ENXIO);
+	if (res % sizeof(cell[0]))
+		return (ENXIO);
+	res /= sizeof(cell[0]);
+	regno *= naddr + nsize;
+	if (regno + naddr + nsize > res)
+		return (EINVAL);
+	pci_hi = pci ? cell[regno] : OFW_PADDR_NOT_PCI;
+	spc = pci_hi & OFW_PCI_PHYS_HI_SPACEMASK;
+	addr = 0;
+	for (c = 0; c < naddr; c++)
+		addr = ((uint64_t)addr << 32) | cell[regno++];
+	size = 0;
+	for (c = 0; c < nsize; c++)
+		size = ((uint64_t)size << 32) | cell[regno++];
+	/*
+	 * Map the address range in the bridge's decoding window as given
+	 * by the "ranges" property. If a node doesn't have such property
+	 * or the property is empty, we assume an identity mapping.  The
+	 * standard says a missing property indicates no possible mapping.
+	 * This code is more liberal since the intended use is to get a
+	 * console running early, and a printf to warn of malformed data
+	 * is probably futile before the console is fully set up.
+	 */
+	parent = OF_parent(bridge);
+	while (parent != 0) {
+		get_addr_props(parent, &nbridge, NULL, &pcib);
+		res = OF_getencprop(bridge, "ranges", cell, sizeof(cell));
+		if (res < 1)
+			goto next;
+		if (res % sizeof(cell[0]))
+			return (ENXIO);
+		/* Capture pci_hi if we just transitioned onto a PCI bus. */
+		if (pcib && pci_hi == OFW_PADDR_NOT_PCI) {
+			pci_hi = cell[0];
+			spc = pci_hi & OFW_PCI_PHYS_HI_SPACEMASK;
+		}
+		res /= sizeof(cell[0]);
+		regno = 0;
+		while (regno < res) {
+			rspc = (pci ? cell[regno] : OFW_PADDR_NOT_PCI) &
+			    OFW_PCI_PHYS_HI_SPACEMASK;
+			if (rspc != spc) {
+				regno += naddr + nbridge + nsize;
+				continue;
+			}
+			raddr = 0;
+			for (c = 0; c < naddr; c++)
+				raddr = ((uint64_t)raddr << 32) | cell[regno++];
+			rspc = (pcib)
+			    ? cell[regno] & OFW_PCI_PHYS_HI_SPACEMASK
+			    : OFW_PADDR_NOT_PCI;
+			baddr = 0;
+			for (c = 0; c < nbridge; c++)
+				baddr = ((uint64_t)baddr << 32) | cell[regno++];
+			rsize = 0;
+			for (c = 0; c < nsize; c++)
+				rsize = ((uint64_t)rsize << 32) | cell[regno++];
+			if (addr < raddr || addr >= raddr + rsize)
+				continue;
+			addr = addr - raddr + baddr;
+			if (rspc != OFW_PADDR_NOT_PCI)
+				spc = rspc;
+		}
+	next:
+		bridge = parent;
+		parent = OF_parent(bridge);
+		get_addr_props(bridge, &naddr, &nsize, &pci);
+	}
+
+	KASSERT(addr <= BUS_SPACE_MAXADDR,
+	    ("Bus sddress is too large: %jx", (uintmax_t)addr));
+	KASSERT(size <= BUS_SPACE_MAXSIZE,
+	    ("Bus size is too large: %jx", (uintmax_t)size));
+
+	*paddr = addr;
+	*psize = size;
+	if (ppci_hi != NULL)
+		*ppci_hi = pci_hi;
+
+	return (0);
+}
+
+/* Parse cmd line args as env - copied from xlp_machdep. */
+/* XXX-BZ this should really be centrally provided for all (boot) code. */
+static void
+_parse_bootargs(char *cmdline)
+{
+	char *n, *v;
+
+	while ((v = strsep(&cmdline, " \n")) != NULL) {
+		if (*v == '\0')
+			continue;
+		if (*v == '-') {
+			while (*v != '\0') {
+				v++;
+				switch (*v) {
+				case 'a': boothowto |= RB_ASKNAME; break;
+				/* Someone should simulate that ;-) */
+				case 'C': boothowto |= RB_CDROM; break;
+				case 'd': boothowto |= RB_KDB; break;
+				case 'D': boothowto |= RB_MULTIPLE; break;
+				case 'm': boothowto |= RB_MUTE; break;
+				case 'g': boothowto |= RB_GDB; break;
+				case 'h': boothowto |= RB_SERIAL; break;
+				case 'p': boothowto |= RB_PAUSE; break;
+				case 'r': boothowto |= RB_DFLTROOT; break;
+				case 's': boothowto |= RB_SINGLE; break;
+				case 'v': boothowto |= RB_VERBOSE; break;
+				}
+			}
+		} else {
+			n = strsep(&v, "=");
+			if (v == NULL)
+				kern_setenv(n, "1");
+			else
+				kern_setenv(n, v);
+		}
+	}
+}
+
+/*
+ * This is intended to be called early on, right after the OF system is
+ * initialized, so pmap may not be up yet.
+ */
+int
+ofw_parse_bootargs(void)
+{
+	phandle_t chosen;
+	char buf[2048];		/* early stack supposedly big enough */
+	int err;
+
+	chosen = OF_finddevice("/chosen");
+	if (chosen <= 0)
+		return (chosen);
+
+	if ((err = OF_getprop(chosen, "bootargs", buf, sizeof(buf))) != -1) {
+		_parse_bootargs(buf);
+		return (0);
+	}
+
+	return (err);
+}