Add functions to access addresses in the device tree. These are brought in from Linux 4.10. Also fix up the header guard for fdtaddr.h to avoid confusion. Signed-off-by: Simon Glass <sjg@chromium.org>master
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9e51204527
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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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* SPDX-License-Identifier: GPL-2.0+ |
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*/ |
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#include <common.h> |
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#include <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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static void dev_count_cells(const struct device_node *np, int *nap, int *nsp) |
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{ |
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of_bus_default_count_cells(np, nap, nsp); |
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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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dev_count_cells(dev, &na, &ns); |
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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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ranges = of_get_property(parent, rprop, &rlen); |
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if (ranges == NULL && !of_empty_ranges_quirk(parent)) { |
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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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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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} |
@ -0,0 +1,64 @@ |
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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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* SPDX-License-Identifier: GPL-2.0+ |
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*/ |
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#ifndef _DM_OF_ADDR_H |
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#define _DM_OF_ADDR_H |
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/**
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* of_translate_address() - translate a device-tree address to a CPU address |
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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 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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* @np: node to check |
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* @in_addr: pointer to input address |
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* @return translated address or OF_BAD_ADDR on error |
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*/ |
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u64 of_translate_address(const struct device_node *no, const __be32 *in_addr); |
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/**
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* of_get_address() - obtain an address from a node |
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* |
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* Extract an address from a node, returns the region size and the address |
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* space flags too. The PCI version uses a BAR number instead of an absolute |
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* index. |
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* |
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* @np: Node to check |
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* @index: Index of address to read (0 = first) |
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* @size: place to put size on success |
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* @flags: place to put flags on success |
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* @return pointer to address which can be read |
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*/ |
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const __be32 *of_get_address(const struct device_node *no, int index, |
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u64 *size, unsigned int *flags); |
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struct resource; |
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/**
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* of_address_to_resource() - translate device tree address to resource |
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* |
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* Note that if your address is a PIO address, the conversion will fail if |
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* the physical address can't be internally converted to an IO token with |
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* pci_address_to_pio(), that is because it's either called to early or it |
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* can't be matched to any host bridge IO space |
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* |
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* @np: node to check |
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* @index: index of address to read (0 = first) |
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* @r: place to put resource information |
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* @return 0 if OK, -ve on error |
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*/ |
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int of_address_to_resource(const struct device_node *no, int index, |
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struct resource *r); |
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#endif |
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