[PATCH v3 01/10] OF: import address related functions from Linux OF API
Sebastian Hesselbarth
sebastian.hesselbarth at gmail.com
Tue Jul 2 14:14:30 EDT 2013
This imports drivers/of/address.c from Linux with some minor modifications.
of_translate_address is not yet enabled and PCI and ISA related bus translations
have not been imported. Also, a corresponding include header is created with
prototypes and non-OF function stubs.
Signed-off-by: Sebastian Hesselbarth <sebastian.hesselbarth at gmail.com>
---
Cc: barebox at lists.infradead.org
---
drivers/of/Makefile | 2 +-
drivers/of/address.c | 431 ++++++++++++++++++++++++++++++++++++++++++++++++++
include/of_address.h | 64 ++++++++
3 files changed, 496 insertions(+), 1 deletions(-)
create mode 100644 drivers/of/address.c
create mode 100644 include/of_address.h
diff --git a/drivers/of/Makefile b/drivers/of/Makefile
index c81bbec..b8add0b 100644
--- a/drivers/of/Makefile
+++ b/drivers/of/Makefile
@@ -1,4 +1,4 @@
-obj-y += base.o fdt.o
+obj-y += address.o base.o fdt.o
obj-$(CONFIG_OFTREE_MEM_GENERIC) += mem_generic.o
obj-$(CONFIG_GPIOLIB) += gpio.o
obj-y += partition.o
diff --git a/drivers/of/address.c b/drivers/of/address.c
new file mode 100644
index 0000000..3e5387a
--- /dev/null
+++ b/drivers/of/address.c
@@ -0,0 +1,431 @@
+/*
+ * address.c - address related devicetree functions
+ *
+ * Copyright (c) 2012 Sascha Hauer <s.hauer at pengutronix.de>, Pengutronix
+ *
+ * based on Linux devicetree support
+ *
+ * See file CREDITS for list of people who contributed to this
+ * project.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2
+ * as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ */
+#include <common.h>
+#include <of.h>
+#include <of_address.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)
+
+/* Debug utility */
+#ifdef DEBUG
+static void of_dump_addr(const char *s, const __be32 *addr, int na)
+{
+ printk(KERN_DEBUG "%s", s);
+ while (na--)
+ printk(" %08x", be32_to_cpu(*(addr++)));
+ printk("\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)(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);
+};
+
+/*
+ * Default translator (generic bus)
+ */
+
+static void of_bus_default_count_cells(struct device_node *dev,
+ int *addrc, int *sizec)
+{
+ if (addrc)
+ *addrc = of_n_addr_cells(dev);
+ if (sizec)
+ *sizec = of_n_size_cells(dev);
+}
+
+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);
+
+ pr_debug("OF: default map, cp=%llx, s=%llx, da=%llx\n",
+ (unsigned long long)cp, (unsigned long long)s,
+ (unsigned long long)da);
+
+ /*
+ * If the number of address cells is larger than 2 we assume the
+ * mapping doesn't specify a physical address. Rather, the address
+ * specifies an identifier that must match exactly.
+ */
+ if (na > 2 && memcmp(range, addr, na * 4) != 0)
+ return OF_BAD_ADDR;
+
+ 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;
+}
+
+static int of_translate_one(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;
+ unsigned 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 not 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
+ */
+ ranges = of_get_property(parent, rprop, &rlen);
+#if !defined(CONFIG_PPC)
+ if (ranges == NULL) {
+ pr_err("OF: no ranges; cannot translate\n");
+ return 1;
+ }
+#endif /* !defined(CONFIG_PPC) */
+ if (ranges == NULL || rlen == 0) {
+ offset = of_read_number(addr, na);
+ memset(addr, 0, pna * 4);
+ pr_debug("OF: empty ranges; 1:1 translation\n");
+ goto finish;
+ }
+
+ pr_debug("OF: 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) {
+ pr_debug("OF: not found !\n");
+ return 1;
+ }
+ memcpy(addr, ranges + na, 4 * pna);
+
+ finish:
+ of_dump_addr("OF: parent translation for:", addr, pna);
+ pr_debug("OF: 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(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;
+
+ pr_debug("OF: ** translation for device %s **\n", dev->full_name);
+
+ /* Get parent & match bus type */
+ parent = of_get_parent(dev);
+ if (parent == NULL)
+ return OF_BAD_ADDR;
+ bus = of_match_bus(parent);
+
+ /* Count address cells & copy address locally */
+ bus->count_cells(dev, &na, &ns);
+ if (!OF_CHECK_COUNTS(na, ns)) {
+ printk(KERN_ERR "prom_parse: Bad cell count for %s\n",
+ dev->full_name);
+ return OF_BAD_ADDR;
+ }
+ memcpy(addr, in_addr, na * 4);
+
+ pr_debug("OF: bus is %s (na=%d, ns=%d) on %s\n",
+ bus->name, na, ns, parent->full_name);
+ of_dump_addr("OF: translating address:", addr, na);
+
+ /* Translate */
+ for (;;) {
+ /* Switch to parent bus */
+ dev = parent;
+ parent = of_get_parent(dev);
+
+ /* If root, we have finished */
+ if (parent == NULL) {
+ pr_debug("OF: 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)) {
+ printk(KERN_ERR "prom_parse: Bad cell count for %s\n",
+ dev->full_name);
+ break;
+ }
+
+ pr_debug("OF: parent bus is %s (na=%d, ns=%d) on %s\n",
+ pbus->name, pna, pns, parent->full_name);
+
+ /* 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("OF: one level translation:", addr, na);
+ }
+
+ return result;
+}
+
+u64 of_translate_dma_address(struct device_node *dev, const __be32 *in_addr)
+{
+ return __of_translate_address(dev, in_addr, "dma-ranges");
+}
+EXPORT_SYMBOL(of_translate_dma_address);
+
+bool of_can_translate_address(struct device_node *dev)
+{
+ struct device_node *parent;
+ struct of_bus *bus;
+ int na, ns;
+
+ parent = of_get_parent(dev);
+ if (parent == NULL)
+ return false;
+
+ bus = of_match_bus(parent);
+ bus->count_cells(dev, &na, &ns);
+
+ return OF_CHECK_COUNTS(na, ns);
+}
+EXPORT_SYMBOL(of_can_translate_address);
+
+const __be32 *of_get_address(struct device_node *dev, int index, u64 *size,
+ unsigned int *flags)
+{
+ const __be32 *prop;
+ unsigned 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);
+ if (!OF_CHECK_ADDR_COUNT(na))
+ return NULL;
+
+ /* Get "reg" or "assigned-addresses" property */
+ prop = of_get_property(dev, bus->addresses, &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_address_to_resource(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));
+ if (flags & IORESOURCE_IO) {
+ unsigned long port;
+ port = pci_address_to_pio(taddr);
+ if (port == (unsigned long)-1)
+ return -EINVAL;
+ r->start = port;
+ r->end = port + size - 1;
+ } else {
+ r->start = taddr;
+ r->end = taddr + size - 1;
+ }
+ r->flags = flags;
+ r->name = name ? name : dev->full_name;
+
+ return 0;
+}
+
+/**
+ * of_address_to_resource - Translate device tree address and return as resource
+ *
+ * Note that if your address is a PIO address, the conversion will fail if
+ * the physical address can't be internally converted to an IO token with
+ * pci_address_to_pio(), that is because it's either called to early or it
+ * can't be matched to any host bridge IO space
+ */
+int of_address_to_resource(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);
+}
+EXPORT_SYMBOL_GPL(of_address_to_resource);
+
+struct device_node *of_find_matching_node_by_address(struct device_node *from,
+ const struct of_device_id *matches,
+ u64 base_address)
+{
+ struct device_node *dn = of_find_matching_node(from, matches);
+ struct resource res;
+
+ while (dn) {
+ if (of_address_to_resource(dn, 0, &res))
+ continue;
+ if (res.start == base_address)
+ return dn;
+ dn = of_find_matching_node(dn, matches);
+ }
+
+ return NULL;
+}
+
+/**
+ * of_iomap - Maps the memory mapped IO for a given device_node
+ * @device: the device whose io range will be mapped
+ * @index: index of the io range
+ *
+ * Returns a pointer to the mapped memory
+ */
+void __iomem *of_iomap(struct device_node *np, int index)
+{
+ struct resource res;
+
+ if (of_address_to_resource(np, index, &res))
+ return NULL;
+
+ return IOMEM(res.start);
+}
+EXPORT_SYMBOL(of_iomap);
diff --git a/include/of_address.h b/include/of_address.h
new file mode 100644
index 0000000..a82e2e5
--- /dev/null
+++ b/include/of_address.h
@@ -0,0 +1,64 @@
+#ifndef __OF_ADDRESS_H
+#define __OF_ADDRESS_H
+
+#include <common.h>
+#include <of.h>
+
+#ifndef pci_address_to_pio
+static inline unsigned long pci_address_to_pio(phys_addr_t addr) { return -1; }
+#endif
+
+#ifdef CONFIG_OFTREE
+
+extern u64 of_translate_dma_address(struct device_node *dev,
+ const __be32 *in_addr);
+extern bool of_can_translate_address(struct device_node *dev);
+extern const __be32 *of_get_address(struct device_node *dev, int index,
+ u64 *size, unsigned int *flags);
+extern int of_address_to_resource(struct device_node *dev, int index,
+ struct resource *r);
+extern struct device_node *of_find_matching_node_by_address(
+ struct device_node *from, const struct of_device_id *matches,
+ u64 base_address);
+extern void __iomem *of_iomap(struct device_node *np, int index);
+
+#else /* CONFIG_OFTREE */
+
+static inline u64 of_translate_dma_address(struct device_node *dev,
+ const __be32 *in_addr)
+{
+ return OF_BAD_ADDR;
+}
+
+static inline bool of_can_translate_address(struct device_node *dev)
+{
+ return false;
+}
+
+static inline const __be32 *of_get_address(struct device_node *dev, int index,
+ u64 *size, unsigned int *flags)
+{
+ return 0;
+}
+
+static inline int of_address_to_resource(struct device_node *dev, int index,
+ struct resource *r)
+{
+ return -ENOSYS;
+}
+
+static inline struct device_node *of_find_matching_node_by_address(
+ struct device_node *from, const struct of_device_id *matches,
+ u64 base_address)
+{
+ return NULL;
+}
+
+static inline void __iomem *of_iomap(struct device_node *np, int index)
+{
+ return NULL;
+}
+
+#endif /* CONFIG_OFTREE */
+
+#endif /* __OF_ADDRESS_H */
--
1.7.2.5
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