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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>
This commit is contained in:
Sebastian Hesselbarth 2014-06-24 13:45:34 +02:00 committed by Sascha Hauer
parent 74d2423dbc
commit f2b9c6b6d4
2 changed files with 86 additions and 0 deletions
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3
drivers/of/Kconfig
View File

@ -15,6 +15,9 @@ config OFDEVICE
select DTC
bool "Enable probing of devices from the devicetree"
config OF_ADDRESS_PCI
bool
config OF_NET
depends on NET
def_bool y

83
drivers/of/address.c
View File

@ -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",