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![Dario Binacchi](/assets/img/avatar_default.png)
The __of_translate_address routine translates an address from the device tree into a CPU physical address. A note in the description of the routine explains that the crossing of any level with since inherited from IBM. This does not happen for Texas Instruments, or at least for the beaglebone device tree. Without this patch, in fact, the translation into physical addresses of the registers contained in the am33xx-clocks.dtsi nodes would not be possible. They all have a parent with #size-cells = <0>. The CONFIG_OF_TRANSLATE_ZERO_SIZE_CELLS symbol makes translation possible even in the case of crossing levels with #size-cells = <0>. The patch acts conservatively on address translation, except for removing a check within the of_translate_one function in the drivers/core/of_addr.c file: + ranges = of_get_property(parent, rprop, &rlen); - if (ranges == NULL && !of_empty_ranges_quirk(parent)) { - debug("no ranges; cannot translate\n"); - return 1; - } if (ranges == NULL || rlen == 0) { offset = of_read_number(addr, na); memset(addr, 0, pna * 4); debug("empty ranges; 1:1 translation\n"); There are two reasons: 1 The function of_empty_ranges_quirk always returns false, invalidating the following if statement in case of null ranges. Therefore one of the two checks is useless. 2 The implementation of the of_translate_one function found in the common/fdt_support.c file has removed this check while keeping the one about the 1:1 translation. The patch adds a test and modifies a check for the correctness of an address in the case of enabling translation also for zero size cells. The added test checks translations of addresses generated by nodes of a device tree similar to those you can find in the files am33xx.dtsi and am33xx-clocks.dtsi for which the patch was created. The patch was also tested on a beaglebone black board. The addresses generated for the registers of the loaded drivers are those specified by the AM335x reference manual. Signed-off-by: Dario Binacchi <dariobin@libero.it> Tested-by: Dario Binacchi <dariobin@libero.it> Reviewed-by: Simon Glass <sjg@chromium.org>
358 lines
9.1 KiB
C
358 lines
9.1 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) && \
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((ns) > 0 || gd_size_cells_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_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 || 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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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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