ofw_subr.c

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/*-
 * 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 <sys/param.h>
#include <sys/boot.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';
                        if (strcmp(type, "pci") == 0 ||
                            strcmp(type, "pciex")== 0)
                                pci = 1;
                }
        }
        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)
{
        static pcell_t cell[256];
        pcell_t 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 address 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);
}
 
/*
 * 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 == -1)
                return (chosen);
 
        if ((err = OF_getprop(chosen, "bootargs", buf, sizeof(buf))) != -1) {
                boothowto |= boot_parse_cmdline(buf);
                return (0);
        }
 
        return (err);
}