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author | Sebastian Hesselbarth <sebastian.hesselbarth@gmail.com> | 2014-06-24 13:45:34 +0200 |
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committer | Sascha Hauer <s.hauer@pengutronix.de> | 2014-06-25 08:44:49 +0200 |
commit | f2b9c6b6d4e3eeeaa9a657e4a36b10184dabb8b7 (patch) | |
tree | ffaf847c3c7aa9f19c46f0891dd2900ef27d16b1 /drivers/of/address.c | |
parent | 74d2423dbc633cc15099bbbf15c9c03d3f2d59a9 (diff) | |
download | barebox-f2b9c6b6d4e3eeeaa9a657e4a36b10184dabb8b7.tar.gz barebox-f2b9c6b6d4e3eeeaa9a657e4a36b10184dabb8b7.tar.xz |
drivers: of: import PCI bus specific translator
DT PCI address translation needs a special handling. This imports
the corresponding translator into of/address.c but makes it selectable
through Kconfig. Compared to the Linux version, we don't check for
struct device_node's type which does not exist on Barebox but directly
for device_type property set to "pci".
Signed-off-by: Sebastian Hesselbarth <sebastian.hesselbarth@gmail.com>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
Diffstat (limited to 'drivers/of/address.c')
-rw-r--r-- | drivers/of/address.c | 83 |
1 files changed, 83 insertions, 0 deletions
diff --git a/drivers/of/address.c b/drivers/of/address.c index 4cacdb1cf7..b3cbb15453 100644 --- a/drivers/of/address.c +++ b/drivers/of/address.c @@ -108,11 +108,94 @@ static unsigned int of_bus_default_get_flags(const __be32 *addr) return IORESOURCE_MEM; } +#ifdef CONFIG_OF_ADDRESS_PCI +/* + * PCI bus specific translator + */ + +static int of_bus_pci_match(struct device_node *np) +{ + return !of_property_match_string(np, "device_type", "pci"); +} + +static void of_bus_pci_count_cells(struct device_node *np, + int *addrc, int *sizec) +{ + if (addrc) + *addrc = 3; + if (sizec) + *sizec = 2; +} + +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; +} + +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("OF: 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; +} + +static int of_bus_pci_translate(__be32 *addr, u64 offset, int na) +{ + return of_bus_default_translate(addr + 1, offset, na - 1); +} +#endif /* CONFIG_OF_ADDRESS_PCI */ + /* * 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 /* Default */ { .name = "default", |