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>
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@ -15,6 +15,9 @@ config OFDEVICE
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select DTC
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bool "Enable probing of devices from the devicetree"
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config OF_ADDRESS_PCI
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bool
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config OF_NET
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depends on NET
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def_bool y
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@ -108,11 +108,94 @@ static unsigned int of_bus_default_get_flags(const __be32 *addr)
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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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/*
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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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