Signed-off-by: Lucas Stach <dev@lynxeye.de> Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
589 lines
15 KiB
C
589 lines
15 KiB
C
/*
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* address.c - address related devicetree functions
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*
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* Copyright (c) 2012 Sascha Hauer <s.hauer@pengutronix.de>, Pengutronix
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*
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* based on Linux devicetree support
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*
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* See file CREDITS for list of people who contributed to this
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* project.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2
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* as published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*/
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#include <common.h>
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#include <of.h>
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#include <of_address.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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/* 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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printk(KERN_DEBUG "%s", s);
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while (na--)
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printk(" %08x", be32_to_cpu(*(addr++)));
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printk("\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)(struct device_node *child,
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int *addrc, int *sizec);
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u64 (*map)(__be32 *addr, const __be32 *range,
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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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/*
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* Default translator (generic bus)
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*/
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static void of_bus_default_count_cells(struct device_node *dev,
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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(dev);
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if (sizec)
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*sizec = of_n_size_cells(dev);
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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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pr_debug("OF: 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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/*
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* If the number of address cells is larger than 2 we assume the
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* mapping doesn't specify a physical address. Rather, the address
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* specifies an identifier that must match exactly.
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*/
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if (na > 2 && memcmp(range, addr, na * 4) != 0)
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return OF_BAD_ADDR;
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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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#ifdef CONFIG_OF_ADDRESS_PCI
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/*
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* PCI bus specific translator
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*/
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static int of_bus_pci_match(struct device_node *np)
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{
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return !of_property_match_string(np, "device_type", "pci");
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}
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static void of_bus_pci_count_cells(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 = 3;
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if (sizec)
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*sizec = 2;
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}
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static unsigned int of_bus_pci_get_flags(const __be32 *addr)
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{
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unsigned int flags = 0;
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u32 w = be32_to_cpup(addr);
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switch ((w >> 24) & 0x03) {
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case 0x01:
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flags |= IORESOURCE_IO;
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break;
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case 0x02: /* 32 bits */
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case 0x03: /* 64 bits */
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flags |= IORESOURCE_MEM;
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break;
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}
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if (w & 0x40000000)
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flags |= IORESOURCE_PREFETCH;
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return flags;
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}
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static u64 of_bus_pci_map(__be32 *addr, const __be32 *range, int na, int ns,
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int pna)
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{
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u64 cp, s, da;
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unsigned int af, rf;
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af = of_bus_pci_get_flags(addr);
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rf = of_bus_pci_get_flags(range);
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/* Check address type match */
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if ((af ^ rf) & (IORESOURCE_MEM | IORESOURCE_IO))
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return OF_BAD_ADDR;
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/* Read address values, skipping high cell */
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cp = of_read_number(range + 1, na - 1);
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s = of_read_number(range + na + pna, ns);
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da = of_read_number(addr + 1, na - 1);
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pr_debug("OF: PCI 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_pci_translate(__be32 *addr, u64 offset, int na)
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{
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return of_bus_default_translate(addr + 1, offset, na - 1);
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}
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#endif /* CONFIG_OF_ADDRESS_PCI */
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#ifdef CONFIG_OF_PCI
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int of_pci_range_parser_init(struct of_pci_range_parser *parser,
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struct device_node *node)
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{
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const int na = 3, ns = 2;
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int rlen;
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parser->node = node;
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parser->pna = of_n_addr_cells(node);
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parser->np = parser->pna + na + ns;
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parser->range = of_get_property(node, "ranges", &rlen);
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if (parser->range == NULL)
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return -ENOENT;
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parser->end = parser->range + rlen / sizeof(__be32);
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return 0;
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}
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EXPORT_SYMBOL_GPL(of_pci_range_parser_init);
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struct of_pci_range *of_pci_range_parser_one(struct of_pci_range_parser *parser,
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struct of_pci_range *range)
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{
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const int na = 3, ns = 2;
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if (!range)
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return NULL;
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if (!parser->range || parser->range + parser->np > parser->end)
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return NULL;
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range->pci_space = parser->range[0];
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range->flags = of_bus_pci_get_flags(parser->range);
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range->pci_addr = of_read_number(parser->range + 1, ns);
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range->cpu_addr = of_translate_address(parser->node,
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parser->range + na);
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range->size = of_read_number(parser->range + parser->pna + na, ns);
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parser->range += parser->np;
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/* Now consume following elements while they are contiguous */
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while (parser->range + parser->np <= parser->end) {
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u32 flags, pci_space;
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u64 pci_addr, cpu_addr, size;
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pci_space = be32_to_cpup(parser->range);
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flags = of_bus_pci_get_flags(parser->range);
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pci_addr = of_read_number(parser->range + 1, ns);
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cpu_addr = of_translate_address(parser->node,
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parser->range + na);
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size = of_read_number(parser->range + parser->pna + na, ns);
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if (flags != range->flags)
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break;
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if (pci_addr != range->pci_addr + range->size ||
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cpu_addr != range->cpu_addr + range->size)
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break;
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range->size += size;
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parser->range += parser->np;
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}
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return range;
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}
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EXPORT_SYMBOL_GPL(of_pci_range_parser_one);
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#endif /* CONFIG_OF_PCI */
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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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#ifdef CONFIG_OF_ADDRESS_PCI
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/* PCI */
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{
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.name = "pci",
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.addresses = "assigned-addresses",
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.match = of_bus_pci_match,
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.count_cells = of_bus_pci_count_cells,
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.map = of_bus_pci_map,
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.translate = of_bus_pci_translate,
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.get_flags = of_bus_pci_get_flags,
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},
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#endif
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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 int of_translate_one(struct device_node *parent, struct of_bus *bus,
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struct of_bus *pbus, __be32 *addr,
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int na, int ns, int pna, const char *rprop)
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{
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const __be32 *ranges;
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unsigned int rlen;
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int rone;
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u64 offset = OF_BAD_ADDR;
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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 not 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 !defined(CONFIG_PPC)
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if (ranges == NULL) {
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pr_err("OF: no ranges; cannot translate\n");
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return 1;
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}
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#endif /* !defined(CONFIG_PPC) */
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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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pr_debug("OF: empty ranges; 1:1 translation\n");
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goto finish;
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}
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pr_debug("OF: 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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pr_debug("OF: 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("OF: parent translation for:", addr, pna);
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pr_debug("OF: 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(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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pr_debug("OF: ** translation for device %s **\n", dev->full_name);
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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 OF_BAD_ADDR;
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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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printk(KERN_ERR "prom_parse: Bad cell count for %s\n",
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dev->full_name);
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return OF_BAD_ADDR;
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}
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memcpy(addr, in_addr, na * 4);
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pr_debug("OF: bus is %s (na=%d, ns=%d) on %s\n",
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bus->name, na, ns, parent->full_name);
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of_dump_addr("OF: 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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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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pr_debug("OF: 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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printk(KERN_ERR "prom_parse: Bad cell count for %s\n",
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dev->full_name);
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break;
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}
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pr_debug("OF: parent bus is %s (na=%d, ns=%d) on %s\n",
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pbus->name, pna, pns, parent->full_name);
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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("OF: one level translation:", addr, na);
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}
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return result;
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}
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u64 of_translate_address(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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EXPORT_SYMBOL(of_translate_address);
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u64 of_translate_dma_address(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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EXPORT_SYMBOL(of_translate_dma_address);
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bool of_can_translate_address(struct device_node *dev)
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{
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struct device_node *parent;
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struct of_bus *bus;
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int na, ns;
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parent = of_get_parent(dev);
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if (parent == NULL)
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return false;
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bus = of_match_bus(parent);
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bus->count_cells(dev, &na, &ns);
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return OF_CHECK_COUNTS(na, ns);
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}
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EXPORT_SYMBOL(of_can_translate_address);
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const __be32 *of_get_address(struct device_node *dev, int index, u64 *size,
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unsigned int *flags)
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{
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const __be32 *prop;
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unsigned 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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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, bus->addresses, &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_address_to_resource(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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if (flags & IORESOURCE_IO) {
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unsigned long port;
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port = pci_address_to_pio(taddr);
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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);
|