cregit-Linux how code gets into the kernel

Release 4.14 drivers/of/address.c

Directory: drivers/of

#define pr_fmt(fmt)	"OF: " fmt

#include <linux/device.h>
#include <linux/io.h>
#include <linux/ioport.h>
#include <linux/module.h>
#include <linux/of_address.h>
#include <linux/pci.h>
#include <linux/pci_regs.h>
#include <linux/sizes.h>
#include <linux/slab.h>
#include <linux/string.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);
static int __of_address_to_resource(struct device_node *dev,
		const __be32 *addrp, u64 size, unsigned int flags,
		const char *name, struct resource *r);

/* Debug utility */
#ifdef DEBUG

static void of_dump_addr(const char *s, const __be32 *addr, int na) { pr_debug("%s", s); while (na--) pr_cont(" %08x", be32_to_cpu(*(addr++))); pr_cont("\n"); }

Contributors

PersonTokensPropCommitsCommitProp
Grant C. Likely4692.00%250.00%
Rob Herring36.00%125.00%
Sebastian Andrzej Siewior12.00%125.00%
Total50100.00%4100.00%

#else
static void of_dump_addr(const char *s, const __be32 *addr, int na) { }

Contributors

PersonTokensPropCommitsCommitProp
Grant C. Likely1794.44%150.00%
Sebastian Andrzej Siewior15.56%150.00%
Total18100.00%2100.00%

#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); }

Contributors

PersonTokensPropCommitsCommitProp
Grant C. Likely43100.00%1100.00%
Total43100.00%1100.00%


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("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; }

Contributors

PersonTokensPropCommitsCommitProp
Grant C. Likely10797.27%125.00%
Kim Phillips10.91%125.00%
Rob Herring10.91%125.00%
Sebastian Andrzej Siewior10.91%125.00%
Total110100.00%4100.00%


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; }

Contributors

PersonTokensPropCommitsCommitProp
Grant C. Likely7798.72%266.67%
Kim Phillips11.28%133.33%
Total78100.00%3100.00%


static unsigned int of_bus_default_get_flags(const __be32 *addr) { return IORESOURCE_MEM; }

Contributors

PersonTokensPropCommitsCommitProp
Grant C. Likely1493.33%150.00%
Sebastian Andrzej Siewior16.67%150.00%
Total15100.00%2100.00%

#ifdef CONFIG_OF_ADDRESS_PCI /* * PCI bus specific translator */
static int of_bus_pci_match(struct device_node *np) { /* * "pciex" is PCI Express * "vci" is for the /chaos bridge on 1st-gen PCI powermacs * "ht" is hypertransport */ return !strcmp(np->type, "pci") || !strcmp(np->type, "pciex") || !strcmp(np->type, "vci") || !strcmp(np->type, "ht"); }

Contributors

PersonTokensPropCommitsCommitProp
Grant C. Likely3260.38%133.33%
Kleber Sacilotto de Souza1120.75%133.33%
Benjamin Herrenschmidt1018.87%133.33%
Total53100.00%3100.00%


static void of_bus_pci_count_cells(struct device_node *np, int *addrc, int *sizec) { if (addrc) *addrc = 3; if (sizec) *sizec = 2; }

Contributors

PersonTokensPropCommitsCommitProp
Grant C. Likely37100.00%1100.00%
Total37100.00%1100.00%


static unsigned int of_bus_pci_get_flags(const __be32 *addr) { unsigned int flags = 0; u32 w = be32_to_cpup(addr); switch((w >> 24) & 0x03) { case 0x01: flags |= IORESOURCE_IO; break; case 0x02: /* 32 bits */ case 0x03: /* 64 bits */ flags |= IORESOURCE_MEM; break; } if (w & 0x40000000) flags |= IORESOURCE_PREFETCH; return flags; }

Contributors

PersonTokensPropCommitsCommitProp
Grant C. Likely6894.44%150.00%
Sebastian Andrzej Siewior45.56%150.00%
Total72100.00%2100.00%


static u64 of_bus_pci_map(__be32 *addr, const __be32 *range, int na, int ns, int pna) { u64 cp, s, da; unsigned int af, rf; af = of_bus_pci_get_flags(addr); rf = of_bus_pci_get_flags(range); /* Check address type match */ if ((af ^ rf) & (IORESOURCE_MEM | IORESOURCE_IO)) return OF_BAD_ADDR; /* Read address values, skipping high cell */ cp = of_read_number(range + 1, na - 1); s = of_read_number(range + na + pna, ns); da = of_read_number(addr + 1, na - 1); pr_debug("PCI 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; }

Contributors

PersonTokensPropCommitsCommitProp
Grant C. Likely15498.09%125.00%
Sebastian Andrzej Siewior10.64%125.00%
Rob Herring10.64%125.00%
Kim Phillips10.64%125.00%
Total157100.00%4100.00%


static int of_bus_pci_translate(__be32 *addr, u64 offset, int na) { return of_bus_default_translate(addr + 1, offset, na - 1); }

Contributors

PersonTokensPropCommitsCommitProp
Grant C. Likely2996.67%150.00%
Kim Phillips13.33%150.00%
Total30100.00%2100.00%

#endif /* CONFIG_OF_ADDRESS_PCI */ #ifdef CONFIG_PCI
const __be32 *of_get_pci_address(struct device_node *dev, int bar_no, 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); if (strcmp(bus->name, "pci")) { of_node_put(parent); return NULL; } 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, bus->addresses, &psize); if (prop == NULL) return NULL; psize /= 4; onesize = na + ns; for (i = 0; psize >= onesize; psize -= onesize, prop += onesize, i++) { u32 val = be32_to_cpu(prop[0]); if ((val & 0xff) == ((bar_no * 4) + PCI_BASE_ADDRESS_0)) { if (size) *size = of_read_number(prop + na, ns); if (flags) *flags = bus->get_flags(prop); return prop; } } return NULL; }

Contributors

PersonTokensPropCommitsCommitProp
Grant C. Likely24798.80%240.00%
Sebastian Andrzej Siewior10.40%120.00%
Stephen Warren10.40%120.00%
Jeremy Kerr10.40%120.00%
Total250100.00%5100.00%

EXPORT_SYMBOL(of_get_pci_address);
int of_pci_address_to_resource(struct device_node *dev, int bar, struct resource *r) { const __be32 *addrp; u64 size; unsigned int flags; addrp = of_get_pci_address(dev, bar, &size, &flags); if (addrp == NULL) return -EINVAL; return __of_address_to_resource(dev, addrp, size, flags, NULL, r); }

Contributors

PersonTokensPropCommitsCommitProp
Grant C. Likely6895.77%133.33%
Benoît Cousson22.82%133.33%
Sebastian Andrzej Siewior11.41%133.33%
Total71100.00%3100.00%

EXPORT_SYMBOL_GPL(of_pci_address_to_resource);
int of_pci_range_parser_init(struct of_pci_range_parser *parser, struct device_node *node) { const int na = 3, ns = 2; int rlen; parser->node = node; parser->pna = of_n_addr_cells(node); parser->np = parser->pna + na + ns; parser->range = of_get_property(node, "ranges", &rlen); if (parser->range == NULL) return -ENOENT; parser->end = parser->range + rlen / sizeof(__be32); return 0; }

Contributors

PersonTokensPropCommitsCommitProp
Andrew Murray99100.00%1100.00%
Total99100.00%1100.00%

EXPORT_SYMBOL_GPL(of_pci_range_parser_init);
struct of_pci_range *of_pci_range_parser_one(struct of_pci_range_parser *parser, struct of_pci_range *range) { const int na = 3, ns = 2; if (!range) return NULL; if (!parser->range || parser->range + parser->np > parser->end) return NULL; range->pci_space = be32_to_cpup(parser->range); range->flags = of_bus_pci_get_flags(parser->range); range->pci_addr = of_read_number(parser->range + 1, ns); range->cpu_addr = of_translate_address(parser->node, parser->range + na); range->size = of_read_number(parser->range + parser->pna + na, ns); parser->range += parser->np; /* Now consume following elements while they are contiguous */ while (parser->range + parser->np <= parser->end) { u32 flags; u64 pci_addr, cpu_addr, size; flags = of_bus_pci_get_flags(parser->range); pci_addr = of_read_number(parser->range + 1, ns); cpu_addr = of_translate_address(parser->node, parser->range + na); size = of_read_number(parser->range + parser->pna + na, ns); if (flags != range->flags) break; if (pci_addr != range->pci_addr + range->size || cpu_addr != range->cpu_addr + range->size) break; range->size += size; parser->range += parser->np; } return range; }

Contributors

PersonTokensPropCommitsCommitProp
Andrew Murray26598.88%150.00%
Rob Herring31.12%150.00%
Total268100.00%2100.00%

EXPORT_SYMBOL_GPL(of_pci_range_parser_one); /* * of_pci_range_to_resource - Create a resource from an of_pci_range * @range: the PCI range that describes the resource * @np: device node where the range belongs to * @res: pointer to a valid resource that will be updated to * reflect the values contained in the range. * * Returns EINVAL if the range cannot be converted to resource. * * Note that if the range is an IO range, the resource will be converted * using pci_address_to_pio() which can fail if it is called too early or * if the range cannot be matched to any host bridge IO space (our case here). * To guard against that we try to register the IO range first. * If that fails we know that pci_address_to_pio() will do too. */
int of_pci_range_to_resource(struct of_pci_range *range, struct device_node *np, struct resource *res) { int err; res->flags = range->flags; res->parent = res->child = res->sibling = NULL; res->name = np->full_name; if (res->flags & IORESOURCE_IO) { unsigned long port; err = pci_register_io_range(range->cpu_addr, range->size); if (err) goto invalid_range; port = pci_address_to_pio(range->cpu_addr); if (port == (unsigned long)-1) { err = -EINVAL; goto invalid_range; } res->start = port; } else { if ((sizeof(resource_size_t) < 8) && upper_32_bits(range->cpu_addr)) { err = -EINVAL; goto invalid_range; } res->start = range->cpu_addr; } res->end = res->start + range->size - 1; return 0; invalid_range: res->start = (resource_size_t)OF_BAD_ADDR; res->end = (resource_size_t)OF_BAD_ADDR; return err; }

Contributors

PersonTokensPropCommitsCommitProp
Liviu Dudau17486.14%266.67%
Pavel Fedin2813.86%133.33%
Total202100.00%3100.00%

#endif /* CONFIG_PCI */ /* * ISA bus specific translator */
static int of_bus_isa_match(struct device_node *np) { return !strcmp(np->name, "isa"); }

Contributors

PersonTokensPropCommitsCommitProp
Grant C. Likely22100.00%1100.00%
Total22100.00%1100.00%


static void of_bus_isa_count_cells(struct device_node *child, int *addrc, int *sizec) { if (addrc) *addrc = 2; if (sizec) *sizec = 1; }

Contributors

PersonTokensPropCommitsCommitProp
Grant C. Likely37100.00%1100.00%
Total37100.00%1100.00%


static u64 of_bus_isa_map(__be32 *addr, const __be32 *range, int na, int ns, int pna) { u64 cp, s, da; /* Check address type match */ if ((addr[0] ^ range[0]) & cpu_to_be32(1)) return OF_BAD_ADDR; /* Read address values, skipping high cell */ cp = of_read_number(range + 1, na - 1); s = of_read_number(range + na + pna, ns); da = of_read_number(addr + 1, na - 1); pr_debug("ISA 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; }

Contributors

PersonTokensPropCommitsCommitProp
Grant C. Likely13595.07%125.00%
Sebastian Andrzej Siewior53.52%125.00%
Kim Phillips10.70%125.00%
Rob Herring10.70%125.00%
Total142100.00%4100.00%


static int of_bus_isa_translate(__be32 *addr, u64 offset, int na) { return of_bus_default_translate(addr + 1, offset, na - 1); }

Contributors

PersonTokensPropCommitsCommitProp
Grant C. Likely2996.67%150.00%
Kim Phillips13.33%150.00%
Total30100.00%2100.00%


static unsigned int of_bus_isa_get_flags(const __be32 *addr) { unsigned int flags = 0; u32 w = be32_to_cpup(addr); if (w & 1) flags |= IORESOURCE_IO; else flags |= IORESOURCE_MEM; return flags; }

Contributors

PersonTokensPropCommitsCommitProp
Grant C. Likely4090.91%150.00%
Sebastian Andrzej Siewior49.09%150.00%
Total44100.00%2100.00%

/* * Array of bus specific translators */ static struct of_bus of_busses[] = { #ifdef CONFIG_OF_ADDRESS_PCI /* PCI */ { .name = "pci", .addresses = "assigned-addresses", .match = of_bus_pci_match, .count_cells = of_bus_pci_count_cells, .map = of_bus_pci_map, .translate = of_bus_pci_translate, .get_flags = of_bus_pci_get_flags, }, #endif /* CONFIG_OF_ADDRESS_PCI */ /* ISA */ { .name = "isa", .addresses = "reg", .match = of_bus_isa_match, .count_cells = of_bus_isa_count_cells, .map = of_bus_isa_map, .translate = of_bus_isa_translate, .get_flags = of_bus_isa_get_flags, }, /* 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; }

Contributors

PersonTokensPropCommitsCommitProp
Grant C. Likely65100.00%1100.00%
Total65100.00%1100.00%


static int of_empty_ranges_quirk(struct device_node *np) { if (IS_ENABLED(CONFIG_PPC)) { /* To save cycles, we cache the result for global "Mac" setting */ static int quirk_state = -1; /* PA-SEMI sdc DT bug */ if (of_device_is_compatible(np, "1682m-sdc")) return true; /* Make quirk cached */ if (quirk_state < 0) quirk_state = of_machine_is_compatible("Power Macintosh") || of_machine_is_compatible("MacRISC"); return quirk_state; } return false; }

Contributors

PersonTokensPropCommitsCommitProp
Benjamin Herrenschmidt66100.00%2100.00%
Total66100.00%2100.00%


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 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 (ranges == NULL && !of_empty_ranges_quirk(parent)) { pr_debug("no ranges; cannot translate\n"); return 1; } if (ranges == NULL || rlen == 0) { offset = of_read_number(addr, na); memset(addr, 0, pna * 4); pr_debug("empty ranges; 1:1 translation\n"); goto finish; } pr_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) { pr_debug("not found !\n"); return 1; } memcpy(addr, ranges + na, 4 * pna); finish: of_dump_addr("parent translation for:", addr, pna); pr_debug("with offset: %llx\n", (unsigned long long)offset); /* Translate it into parent bus space */ return pbus->translate(addr, offset, pna); }

Contributors

PersonTokensPropCommitsCommitProp
Grant C. Likely23993.73%222.22%
Benjamin Herrenschmidt72.75%333.33%
Rob Herring62.35%111.11%
Masahiro Yamada10.39%111.11%
Kim Phillips10.39%111.11%
Sebastian Andrzej Siewior10.39%111.11%
Total255100.00%9100.00%

/* * 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("** translation for device %pOF **\n", dev); /* Increase refcount at current level */ 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)) { pr_debug("Bad cell count for %pOF\n", dev); goto bail; } memcpy(addr, in_addr, na * 4); pr_debug("bus is %s (na=%d, ns=%d) on %pOF\n", bus->name, na, ns, 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) { pr_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)) { pr_err("Bad cell count for %pOF\n", dev); break; } pr_debug("parent bus is %s (na=%d, ns=%d) on %pOF\n", pbus->name, pna, pns, 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; }

Contributors

PersonTokensPropCommitsCommitProp
Grant C. Likely31595.74%330.00%
Rob Herring92.74%330.00%
Kim Phillips20.61%110.00%
Masahiro Yamada10.30%110.00%
Sebastian Andrzej Siewior10.30%110.00%
Andrew Murray10.30%110.00%
Total329100.00%10100.00%


u64 of_translate_address(struct device_node *dev, const __be32 *in_addr) { return __of_translate_address(dev, in_addr, "ranges"); }

Contributors

PersonTokensPropCommitsCommitProp
Grant C. Likely2496.00%150.00%
Sebastian Andrzej Siewior14.00%150.00%
Total25100.00%2100.00%

EXPORT_SYMBOL(of_translate_address);
u64 of_translate_dma_address(struct device_node *dev, const __be32 *in_addr) { return __of_translate_address(dev, in_addr, "dma-ranges"); }

Contributors

PersonTokensPropCommitsCommitProp
Grant C. Likely2496.00%150.00%
Sebastian Andrzej Siewior14.00%150.00%
Total25100.00%2100.00%

EXPORT_SYMBOL(of_translate_dma_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); of_node_put(parent); 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; }

Contributors

PersonTokensPropCommitsCommitProp
Grant C. Likely20198.53%133.33%
Sebastian Andrzej Siewior20.98%133.33%
Stephen Warren10.49%133.33%
Total204100.00%3100.00%

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; }

Contributors

PersonTokensPropCommitsCommitProp
Grant C. Likely16694.32%360.00%
Benoît Cousson95.11%120.00%
Sebastian Andrzej Siewior10.57%120.00%
Total176100.00%5100.00%

/** * 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 too 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); }

Contributors

PersonTokensPropCommitsCommitProp
Grant C. Likely6874.73%133.33%
Benoît Cousson2224.18%133.33%
Sebastian Andrzej Siewior11.10%133.33%
Total91100.00%3100.00%

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) && res.start == base_address) return dn; dn = of_find_matching_node(dn, matches); } return NULL; }

Contributors

PersonTokensPropCommitsCommitProp
Grant C. Likely7597.40%150.00%
David Daney22.60%150.00%
Total77100.00%2100.00%

/** * 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 ioremap(res.start, resource_size(&res)); }

Contributors

PersonTokensPropCommitsCommitProp
Grant C. Likely4491.67%150.00%
Felipe Balbi48.33%150.00%
Total48100.00%2100.00%

EXPORT_SYMBOL(of_iomap); /* * of_io_request_and_map - Requests a resource and 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 * @name: name of the resource * * Returns a pointer to the requested and mapped memory or an ERR_PTR() encoded * error code on failure. Usage example: * * base = of_io_request_and_map(node, 0, "foo"); * if (IS_ERR(base)) * return PTR_ERR(base); */
void __iomem *of_io_request_and_map(struct device_node *np, int index, const char *name) { struct resource res; void __iomem *mem; if (of_address_to_resource(np, index, &res)) return IOMEM_ERR_PTR(-EINVAL); if (!request_mem_region(res.start, resource_size(&res), name)) return IOMEM_ERR_PTR(-EBUSY); mem = ioremap(res.start, resource_size(&res)); if (!mem) { release_mem_region(res.start, resource_size(&res)); return IOMEM_ERR_PTR(-ENOMEM); } return mem; }

Contributors

PersonTokensPropCommitsCommitProp
Matthias Brugger118100.00%2100.00%
Total118100.00%2100.00%

EXPORT_SYMBOL(of_io_request_and_map); /** * of_dma_get_range - Get DMA range info * @np: device node to get DMA range info * @dma_addr: pointer to store initial DMA address of DMA range * @paddr: pointer to store initial CPU address of DMA range * @size: pointer to store size of DMA range * * Look in bottom up direction for the first "dma-ranges" property * and parse it. * dma-ranges format: * DMA addr (dma_addr) : naddr cells * CPU addr (phys_addr_t) : pna cells * size : nsize cells * * It returns -ENODEV if "dma-ranges" property was not found * for this device in DT. */
int of_dma_get_range(struct device_node *np, u64 *dma_addr, u64 *paddr, u64 *size) { struct device_node *node = of_node_get(np); const __be32 *ranges = NULL; int len, naddr, nsize, pna; int ret = 0; u64 dmaaddr; if (!node) return -EINVAL; while (1) { naddr = of_n_addr_cells(node); nsize = of_n_size_cells(node); node = of_get_next_parent(node); if (!node) break; ranges = of_get_property(node, "dma-ranges", &len); /* Ignore empty ranges, they imply no translation required */ if (ranges && len > 0) break; /* * At least empty ranges has to be defined for parent node if * DMA is supported */ if (!ranges) break; } if (!ranges) { pr_debug("no dma-ranges found for node(%pOF)\n", np); ret = -ENODEV; goto out; } len /= sizeof(u32); pna = of_n_addr_cells(node); /* dma-ranges format: * DMA addr : naddr cells * CPU addr : pna cells * size : nsize cells */ dmaaddr = of_read_number(ranges, naddr); *paddr = of_translate_dma_address(np, ranges); if (*paddr == OF_BAD_ADDR) { pr_err("translation of DMA address(%pad) to CPU address failed node(%pOF)\n", dma_addr, np); ret = -EINVAL; goto out; } *dma_addr = dmaaddr; *size = of_read_number(ranges + naddr + pna, nsize); pr_debug("dma_addr(%llx) cpu_addr(%llx) size(%llx)\n", *dma_addr, *paddr, *size); out: of_node_put(node); return ret; }

Contributors

PersonTokensPropCommitsCommitProp
Grygorii Strashko25099.21%150.00%
Rob Herring20.79%150.00%
Total252100.00%2100.00%

EXPORT_SYMBOL_GPL(of_dma_get_range); /** * of_dma_is_coherent - Check if device is coherent * @np: device node * * It returns true if "dma-coherent" property was found * for this device in DT. */
bool of_dma_is_coherent(struct device_node *np) { struct device_node *node = of_node_get(np); while (node) { if (of_property_read_bool(node, "dma-coherent")) { of_node_put(node); return true; } node = of_get_next_parent(node); } of_node_put(node); return false; }

Contributors

PersonTokensPropCommitsCommitProp
Santosh Shilimkar60100.00%1100.00%
Total60100.00%1100.00%

EXPORT_SYMBOL_GPL(of_dma_is_coherent);

Overall Contributors

PersonTokensPropCommitsCommitProp
Grant C. Likely277168.54%921.95%
Andrew Murray3759.28%24.88%
Grygorii Strashko2566.33%12.44%
Liviu Dudau1814.48%37.32%
Matthias Brugger1243.07%24.88%
Benjamin Herrenschmidt832.05%49.76%
Santosh Shilimkar661.63%12.44%
Benoît Cousson380.94%12.44%
Rob Herring330.82%49.76%
Sebastian Andrzej Siewior310.77%12.44%
Pavel Fedin280.69%12.44%
Kim Phillips110.27%12.44%
Kleber Sacilotto de Souza110.27%12.44%
Stephen Warren100.25%12.44%
Gregory CLEMENT90.22%12.44%
Felipe Balbi40.10%12.44%
Tomasz Nowicki30.07%12.44%
Arnd Bergmann30.07%12.44%
Masahiro Yamada20.05%24.88%
David Daney20.05%12.44%
Frank Rowand10.02%12.44%
Jeremy Kerr10.02%12.44%
Total4043100.00%41100.00%
Directory: drivers/of
Information contained on this website is for historical information purposes only and does not indicate or represent copyright ownership.
Created with cregit.