u-boot/drivers/core/of_addr.c

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