mirror of
https://github.com/AsahiLinux/u-boot
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440 lines
11 KiB
C
440 lines
11 KiB
C
// SPDX-License-Identifier: GPL-2.0+
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/*
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* Taken from Linux v4.9 drivers/of/address.c
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*
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* Modified for U-Boot
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* Copyright (c) 2017 Google, Inc
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*/
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#include <common.h>
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#include <log.h>
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#include <linux/bug.h>
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#include <linux/libfdt.h>
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#include <dm/of_access.h>
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#include <dm/of_addr.h>
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#include <linux/err.h>
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#include <linux/ioport.h>
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/* Max address size we deal with */
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#define OF_MAX_ADDR_CELLS 4
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#define OF_CHECK_ADDR_COUNT(na) ((na) > 0 && (na) <= OF_MAX_ADDR_CELLS)
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#define OF_CHECK_COUNTS(na, ns) (OF_CHECK_ADDR_COUNT(na) && (ns) > 0)
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static struct of_bus *of_match_bus(struct device_node *np);
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/* Debug utility */
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#ifdef DEBUG
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static void of_dump_addr(const char *s, const __be32 *addr, int na)
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{
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debug("%s", s);
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while (na--)
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pr_cont(" %08x", be32_to_cpu(*(addr++)));
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pr_cont("\n");
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}
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#else
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static void of_dump_addr(const char *s, const __be32 *addr, int na) { }
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#endif
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/* Callbacks for bus specific translators */
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struct of_bus {
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const char *name;
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const char *addresses;
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int (*match)(struct device_node *parent);
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void (*count_cells)(const struct device_node *child, int *addrc,
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int *sizec);
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u64 (*map)(__be32 *addr, const __be32 *range, int na, int ns, int pna);
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int (*translate)(__be32 *addr, u64 offset, int na);
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unsigned int (*get_flags)(const __be32 *addr);
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};
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static void of_bus_default_count_cells(const struct device_node *np,
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int *addrc, int *sizec)
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{
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if (addrc)
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*addrc = of_n_addr_cells(np);
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if (sizec)
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*sizec = of_n_size_cells(np);
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}
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static u64 of_bus_default_map(__be32 *addr, const __be32 *range,
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int na, int ns, int pna)
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{
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u64 cp, s, da;
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cp = of_read_number(range, na);
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s = of_read_number(range + na + pna, ns);
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da = of_read_number(addr, na);
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debug("default map, cp=%llx, s=%llx, da=%llx\n",
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(unsigned long long)cp, (unsigned long long)s,
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(unsigned long long)da);
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if (da < cp || da >= (cp + s))
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return OF_BAD_ADDR;
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return da - cp;
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}
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static int of_bus_default_translate(__be32 *addr, u64 offset, int na)
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{
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u64 a = of_read_number(addr, na);
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memset(addr, 0, na * 4);
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a += offset;
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if (na > 1)
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addr[na - 2] = cpu_to_be32(a >> 32);
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addr[na - 1] = cpu_to_be32(a & 0xffffffffu);
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return 0;
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}
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static unsigned int of_bus_default_get_flags(const __be32 *addr)
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{
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return IORESOURCE_MEM;
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}
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/*
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* Array of bus-specific translators
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*/
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static struct of_bus of_busses[] = {
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/* Default */
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{
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.name = "default",
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.addresses = "reg",
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.match = NULL,
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.count_cells = of_bus_default_count_cells,
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.map = of_bus_default_map,
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.translate = of_bus_default_translate,
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.get_flags = of_bus_default_get_flags,
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},
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};
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static struct of_bus *of_match_bus(struct device_node *np)
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{
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int i;
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for (i = 0; i < ARRAY_SIZE(of_busses); i++)
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if (!of_busses[i].match || of_busses[i].match(np))
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return &of_busses[i];
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BUG();
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return NULL;
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}
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const __be32 *of_get_address(const struct device_node *dev, int index,
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u64 *size, unsigned int *flags)
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{
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const __be32 *prop;
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int psize;
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struct device_node *parent;
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struct of_bus *bus;
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int onesize, i, na, ns;
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/* Get parent & match bus type */
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parent = of_get_parent(dev);
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if (parent == NULL)
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return NULL;
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bus = of_match_bus(parent);
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bus->count_cells(dev, &na, &ns);
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of_node_put(parent);
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if (!OF_CHECK_ADDR_COUNT(na))
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return NULL;
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/* Get "reg" or "assigned-addresses" property */
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prop = of_get_property(dev, "reg", &psize);
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if (prop == NULL)
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return NULL;
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psize /= 4;
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onesize = na + ns;
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for (i = 0; psize >= onesize; psize -= onesize, prop += onesize, i++)
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if (i == index) {
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if (size)
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*size = of_read_number(prop + na, ns);
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if (flags)
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*flags = bus->get_flags(prop);
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return prop;
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}
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return NULL;
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}
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EXPORT_SYMBOL(of_get_address);
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static int of_empty_ranges_quirk(const struct device_node *np)
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{
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return false;
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}
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static int of_translate_one(const struct device_node *parent,
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struct of_bus *bus, struct of_bus *pbus,
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__be32 *addr, int na, int ns, int pna,
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const char *rprop)
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{
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const __be32 *ranges;
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int rlen;
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int rone;
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u64 offset = OF_BAD_ADDR;
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/*
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* Normally, an absence of a "ranges" property means we are
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* crossing a non-translatable boundary, and thus the addresses
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* below the current cannot be converted to CPU physical ones.
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* Unfortunately, while this is very clear in the spec, it's not
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* what Apple understood, and they do have things like /uni-n or
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* /ht nodes with no "ranges" property and a lot of perfectly
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* useable mapped devices below them. Thus we treat the absence of
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* "ranges" as equivalent to an empty "ranges" property which means
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* a 1:1 translation at that level. It's up to the caller not to try
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* to translate addresses that aren't supposed to be translated in
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* the first place. --BenH.
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*
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* As far as we know, this damage only exists on Apple machines, so
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* This code is only enabled on powerpc. --gcl
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*
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* This quirk also applies for 'dma-ranges' which frequently exist in
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* child nodes without 'dma-ranges' in the parent nodes. --RobH
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*/
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ranges = of_get_property(parent, rprop, &rlen);
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if (ranges == NULL && !of_empty_ranges_quirk(parent) &&
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strcmp(rprop, "dma-ranges")) {
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debug("no ranges; cannot translate\n");
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return 1;
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}
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if (ranges == NULL || rlen == 0) {
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offset = of_read_number(addr, na);
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memset(addr, 0, pna * 4);
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debug("empty ranges; 1:1 translation\n");
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goto finish;
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}
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debug("walking ranges...\n");
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/* Now walk through the ranges */
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rlen /= 4;
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rone = na + pna + ns;
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for (; rlen >= rone; rlen -= rone, ranges += rone) {
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offset = bus->map(addr, ranges, na, ns, pna);
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if (offset != OF_BAD_ADDR)
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break;
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}
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if (offset == OF_BAD_ADDR) {
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debug("not found !\n");
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return 1;
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}
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memcpy(addr, ranges + na, 4 * pna);
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finish:
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of_dump_addr("parent translation for:", addr, pna);
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debug("with offset: %llx\n", (unsigned long long)offset);
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/* Translate it into parent bus space */
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return pbus->translate(addr, offset, pna);
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}
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/*
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* Translate an address from the device-tree into a CPU physical address,
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* this walks up the tree and applies the various bus mappings on the
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* way.
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*
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* Note: We consider that crossing any level with #size-cells == 0 to mean
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* that translation is impossible (that is we are not dealing with a value
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* that can be mapped to a cpu physical address). This is not really specified
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* that way, but this is traditionally the way IBM at least do things
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*/
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static u64 __of_translate_address(const struct device_node *dev,
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const __be32 *in_addr, const char *rprop)
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{
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struct device_node *parent = NULL;
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struct of_bus *bus, *pbus;
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__be32 addr[OF_MAX_ADDR_CELLS];
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int na, ns, pna, pns;
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u64 result = OF_BAD_ADDR;
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debug("** translation for device %s **\n", of_node_full_name(dev));
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/* Increase refcount at current level */
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(void)of_node_get(dev);
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/* Get parent & match bus type */
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parent = of_get_parent(dev);
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if (parent == NULL)
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goto bail;
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bus = of_match_bus(parent);
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/* Count address cells & copy address locally */
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bus->count_cells(dev, &na, &ns);
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if (!OF_CHECK_COUNTS(na, ns)) {
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debug("Bad cell count for %s\n", of_node_full_name(dev));
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goto bail;
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}
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memcpy(addr, in_addr, na * 4);
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debug("bus is %s (na=%d, ns=%d) on %s\n", bus->name, na, ns,
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of_node_full_name(parent));
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of_dump_addr("translating address:", addr, na);
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/* Translate */
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for (;;) {
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/* Switch to parent bus */
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of_node_put(dev);
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dev = parent;
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parent = of_get_parent(dev);
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/* If root, we have finished */
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if (parent == NULL) {
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debug("reached root node\n");
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result = of_read_number(addr, na);
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break;
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}
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/* Get new parent bus and counts */
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pbus = of_match_bus(parent);
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pbus->count_cells(dev, &pna, &pns);
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if (!OF_CHECK_COUNTS(pna, pns)) {
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debug("Bad cell count for %s\n",
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of_node_full_name(dev));
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break;
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}
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debug("parent bus is %s (na=%d, ns=%d) on %s\n", pbus->name,
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pna, pns, of_node_full_name(parent));
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/* Apply bus translation */
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if (of_translate_one(dev, bus, pbus, addr, na, ns, pna, rprop))
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break;
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/* Complete the move up one level */
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na = pna;
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ns = pns;
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bus = pbus;
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of_dump_addr("one level translation:", addr, na);
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}
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bail:
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of_node_put(parent);
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of_node_put(dev);
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return result;
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}
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u64 of_translate_address(const struct device_node *dev, const __be32 *in_addr)
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{
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return __of_translate_address(dev, in_addr, "ranges");
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}
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u64 of_translate_dma_address(const struct device_node *dev, const __be32 *in_addr)
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{
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return __of_translate_address(dev, in_addr, "dma-ranges");
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}
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int of_get_dma_range(const struct device_node *dev, phys_addr_t *cpu,
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dma_addr_t *bus, u64 *size)
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{
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bool found_dma_ranges = false;
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struct device_node *parent;
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struct of_bus *bus_node;
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int na, ns, pna, pns;
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const __be32 *ranges;
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int ret = 0;
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int len;
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/* Find the closest dma-ranges property */
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dev = of_node_get(dev);
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while (dev) {
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ranges = of_get_property(dev, "dma-ranges", &len);
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/* Ignore empty ranges, they imply no translation required */
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if (ranges && len > 0)
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break;
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/* Once we find 'dma-ranges', then a missing one is an error */
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if (found_dma_ranges && !ranges) {
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ret = -EINVAL;
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goto out;
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}
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if (ranges)
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found_dma_ranges = true;
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parent = of_get_parent(dev);
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of_node_put(dev);
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dev = parent;
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}
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if (!dev || !ranges) {
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debug("no dma-ranges found for node %s\n",
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of_node_full_name(dev));
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ret = -ENOENT;
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goto out;
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}
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/* switch to that node */
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parent = of_get_parent(dev);
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if (!parent) {
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printf("Found dma-ranges in root node, shouldn't happen\n");
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ret = -EINVAL;
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goto out;
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}
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/* Get the address sizes both for the bus and its parent */
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bus_node = of_match_bus((struct device_node*)dev);
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bus_node->count_cells(dev, &na, &ns);
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if (!OF_CHECK_COUNTS(na, ns)) {
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printf("Bad cell count for %s\n", of_node_full_name(dev));
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ret = -EINVAL;
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goto out_parent;
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}
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bus_node = of_match_bus(parent);
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bus_node->count_cells(parent, &pna, &pns);
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if (!OF_CHECK_COUNTS(pna, pns)) {
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printf("Bad cell count for %s\n", of_node_full_name(parent));
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ret = -EINVAL;
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goto out_parent;
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}
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*bus = of_read_number(ranges, na);
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*cpu = of_translate_dma_address(dev, ranges + na);
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*size = of_read_number(ranges + na + pna, ns);
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out_parent:
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of_node_put(parent);
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out:
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of_node_put(dev);
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return ret;
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}
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static int __of_address_to_resource(const struct device_node *dev,
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const __be32 *addrp, u64 size, unsigned int flags,
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const char *name, struct resource *r)
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{
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u64 taddr;
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if ((flags & (IORESOURCE_IO | IORESOURCE_MEM)) == 0)
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return -EINVAL;
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taddr = of_translate_address(dev, addrp);
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if (taddr == OF_BAD_ADDR)
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return -EINVAL;
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memset(r, 0, sizeof(struct resource));
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r->start = taddr;
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r->end = taddr + size - 1;
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r->flags = flags;
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r->name = name ? name : dev->full_name;
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return 0;
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}
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int of_address_to_resource(const struct device_node *dev, int index,
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struct resource *r)
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{
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const __be32 *addrp;
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u64 size;
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unsigned int flags;
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const char *name = NULL;
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addrp = of_get_address(dev, index, &size, &flags);
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if (addrp == NULL)
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return -EINVAL;
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/* Get optional "reg-names" property to add a name to a resource */
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of_property_read_string_index(dev, "reg-names", index, &name);
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return __of_address_to_resource(dev, addrp, size, flags, name, r);
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}
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