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fdt: Add several apis to decode pci device node
This commit adds several APIs to decode PCI device node according to the Open Firmware PCI bus bindings, including: - fdtdec_get_pci_addr() for encoded pci address - fdtdec_get_pci_vendev() for vendor id and device id - fdtdec_get_pci_bdf() for pci device bdf triplet - fdtdec_get_pci_bar32() for pci device register bar Signed-off-by: Bin Meng <bmeng.cn@gmail.com> Acked-by: Simon Glass <sjg@chromium.org> Signed-off-by: Simon Glass <sjg@chromium.org> (Include <pci.h> in fdtdec.h and adjust tegra to fix build error)
This commit is contained in:
Bin Meng
Simon Glass
parent
949dbc12db
commit
a62e84d7b1
@ -458,6 +458,7 @@ static int tegra_pcie_parse_port_info(const void *fdt, int node,
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unsigned int *index,
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unsigned int *lanes)
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{
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struct fdt_pci_addr addr;
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pci_dev_t bdf;
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int err;
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@ -469,7 +470,7 @@ static int tegra_pcie_parse_port_info(const void *fdt, int node,
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*lanes = err;
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err = fdtdec_pci_get_bdf(fdt, node, &bdf);
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err = fdtdec_get_pci_bdf(fdt, node, &addr, &bdf);
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if (err < 0) {
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error("failed to parse \"reg\" property");
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return err;
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109
include/fdtdec.h
109
include/fdtdec.h
@ -15,6 +15,7 @@
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*/
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#include <libfdt.h>
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#include <pci.h>
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/*
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* A typedef for a physical address. Note that fdt data is always big
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@ -50,6 +51,49 @@ struct fdt_resource {
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fdt_addr_t end;
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};
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enum fdt_pci_space {
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FDT_PCI_SPACE_CONFIG = 0,
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FDT_PCI_SPACE_IO = 0x01000000,
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FDT_PCI_SPACE_MEM32 = 0x02000000,
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FDT_PCI_SPACE_MEM64 = 0x03000000,
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FDT_PCI_SPACE_MEM32_PREF = 0x42000000,
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FDT_PCI_SPACE_MEM64_PREF = 0x43000000,
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};
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#define FDT_PCI_ADDR_CELLS 3
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#define FDT_PCI_SIZE_CELLS 2
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#define FDT_PCI_REG_SIZE \
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((FDT_PCI_ADDR_CELLS + FDT_PCI_SIZE_CELLS) * sizeof(u32))
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/*
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* The Open Firmware spec defines PCI physical address as follows:
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*
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* bits# 31 .... 24 23 .... 16 15 .... 08 07 .... 00
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*
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* phys.hi cell: npt000ss bbbbbbbb dddddfff rrrrrrrr
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* phys.mid cell: hhhhhhhh hhhhhhhh hhhhhhhh hhhhhhhh
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* phys.lo cell: llllllll llllllll llllllll llllllll
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*
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* where:
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*
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* n: is 0 if the address is relocatable, 1 otherwise
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* p: is 1 if addressable region is prefetchable, 0 otherwise
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* t: is 1 if the address is aliased (for non-relocatable I/O) below 1MB
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* (for Memory), or below 64KB (for relocatable I/O)
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* ss: is the space code, denoting the address space
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* bbbbbbbb: is the 8-bit Bus Number
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* ddddd: is the 5-bit Device Number
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* fff: is the 3-bit Function Number
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* rrrrrrrr: is the 8-bit Register Number
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* hhhhhhhh: is a 32-bit unsigned number
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* llllllll: is a 32-bit unsigned number
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*/
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struct fdt_pci_addr {
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u32 phys_hi;
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u32 phys_mid;
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u32 phys_lo;
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};
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/**
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* Compute the size of a resource.
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*
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@ -257,6 +301,60 @@ fdt_addr_t fdtdec_get_addr(const void *blob, int node,
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fdt_addr_t fdtdec_get_addr_size(const void *blob, int node,
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const char *prop_name, fdt_size_t *sizep);
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/**
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* Look at an address property in a node and return the pci address which
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* corresponds to the given type in the form of fdt_pci_addr.
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* The property must hold one fdt_pci_addr with a lengh.
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*
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* @param blob FDT blob
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* @param node node to examine
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* @param type pci address type (FDT_PCI_SPACE_xxx)
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* @param prop_name name of property to find
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* @param addr returns pci address in the form of fdt_pci_addr
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* @return 0 if ok, negative on error
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*/
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int fdtdec_get_pci_addr(const void *blob, int node, enum fdt_pci_space type,
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const char *prop_name, struct fdt_pci_addr *addr);
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/**
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* Look at the compatible property of a device node that represents a PCI
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* device and extract pci vendor id and device id from it.
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*
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* @param blob FDT blob
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* @param node node to examine
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* @param vendor vendor id of the pci device
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* @param device device id of the pci device
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* @return 0 if ok, negative on error
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*/
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int fdtdec_get_pci_vendev(const void *blob, int node,
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u16 *vendor, u16 *device);
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/**
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* Look at the pci address of a device node that represents a PCI device
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* and parse the bus, device and function number from it.
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*
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* @param blob FDT blob
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* @param node node to examine
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* @param addr pci address in the form of fdt_pci_addr
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* @param bdf returns bus, device, function triplet
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* @return 0 if ok, negative on error
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*/
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int fdtdec_get_pci_bdf(const void *blob, int node,
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struct fdt_pci_addr *addr, pci_dev_t *bdf);
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/**
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* Look at the pci address of a device node that represents a PCI device
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* and return base address of the pci device's registers.
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*
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* @param blob FDT blob
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* @param node node to examine
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* @param addr pci address in the form of fdt_pci_addr
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* @param bar returns base address of the pci device's registers
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* @return 0 if ok, negative on error
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*/
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int fdtdec_get_pci_bar32(const void *blob, int node,
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struct fdt_pci_addr *addr, u32 *bar);
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/**
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* Look up a 32-bit integer property in a node and return it. The property
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* must have at least 4 bytes of data. The value of the first cell is
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@ -682,17 +780,6 @@ int fdt_get_named_resource(const void *fdt, int node, const char *property,
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const char *prop_names, const char *name,
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struct fdt_resource *res);
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/**
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* Look at the reg property of a device node that represents a PCI device
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* and parse the bus, device and function number from it.
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*
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* @param fdt FDT blob
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* @param node node to examine
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* @param bdf returns bus, device, function triplet
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* @return 0 if ok, negative on error
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*/
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int fdtdec_pci_get_bdf(const void *fdt, int node, int *bdf);
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/**
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* Decode a named region within a memory bank of a given type.
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*
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171
lib/fdtdec.c
171
lib/fdtdec.c
@ -126,6 +126,163 @@ fdt_addr_t fdtdec_get_addr(const void *blob, int node,
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return fdtdec_get_addr_size(blob, node, prop_name, NULL);
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}
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#ifdef CONFIG_PCI
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int fdtdec_get_pci_addr(const void *blob, int node, enum fdt_pci_space type,
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const char *prop_name, struct fdt_pci_addr *addr)
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{
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const u32 *cell;
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int len;
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int ret = -ENOENT;
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debug("%s: %s: ", __func__, prop_name);
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/*
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* If we follow the pci bus bindings strictly, we should check
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* the value of the node's parent node's #address-cells and
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* #size-cells. They need to be 3 and 2 accordingly. However,
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* for simplicity we skip the check here.
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*/
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cell = fdt_getprop(blob, node, prop_name, &len);
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if (!cell)
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goto fail;
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if ((len % FDT_PCI_REG_SIZE) == 0) {
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int num = len / FDT_PCI_REG_SIZE;
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int i;
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for (i = 0; i < num; i++) {
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debug("pci address #%d: %08lx %08lx %08lx\n", i,
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(ulong)fdt_addr_to_cpu(cell[0]),
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(ulong)fdt_addr_to_cpu(cell[1]),
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(ulong)fdt_addr_to_cpu(cell[2]));
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if ((fdt_addr_to_cpu(*cell) & type) == type) {
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addr->phys_hi = fdt_addr_to_cpu(cell[0]);
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addr->phys_mid = fdt_addr_to_cpu(cell[1]);
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addr->phys_lo = fdt_addr_to_cpu(cell[2]);
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break;
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} else {
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cell += (FDT_PCI_ADDR_CELLS +
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FDT_PCI_SIZE_CELLS);
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}
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}
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if (i == num)
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goto fail;
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return 0;
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} else {
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ret = -EINVAL;
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}
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fail:
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debug("(not found)\n");
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return ret;
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}
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int fdtdec_get_pci_vendev(const void *blob, int node, u16 *vendor, u16 *device)
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{
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const char *list, *end;
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int len;
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list = fdt_getprop(blob, node, "compatible", &len);
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if (!list)
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return -ENOENT;
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end = list + len;
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while (list < end) {
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char *s;
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len = strlen(list);
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if (len >= strlen("pciVVVV,DDDD")) {
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s = strstr(list, "pci");
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/*
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* check if the string is something like pciVVVV,DDDD.RR
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* or just pciVVVV,DDDD
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*/
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if (s && s[7] == ',' &&
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(s[12] == '.' || s[12] == 0)) {
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s += 3;
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*vendor = simple_strtol(s, NULL, 16);
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s += 5;
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*device = simple_strtol(s, NULL, 16);
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return 0;
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}
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} else {
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list += (len + 1);
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}
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}
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return -ENOENT;
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}
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int fdtdec_get_pci_bdf(const void *blob, int node,
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struct fdt_pci_addr *addr, pci_dev_t *bdf)
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{
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u16 dt_vendor, dt_device, vendor, device;
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int ret;
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/* get vendor id & device id from the compatible string */
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ret = fdtdec_get_pci_vendev(blob, node, &dt_vendor, &dt_device);
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if (ret)
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return ret;
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/* extract the bdf from fdt_pci_addr */
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*bdf = addr->phys_hi & 0xffff00;
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/* read vendor id & device id based on bdf */
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pci_read_config_word(*bdf, PCI_VENDOR_ID, &vendor);
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pci_read_config_word(*bdf, PCI_DEVICE_ID, &device);
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/*
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* Note there are two places in the device tree to fully describe
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* a pci device: one is via compatible string with a format of
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* "pciVVVV,DDDD" and the other one is the bdf numbers encoded in
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* the device node's reg address property. We read the vendor id
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* and device id based on bdf and compare the values with the
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* "VVVV,DDDD". If they are the same, then we are good to use bdf
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* to read device's bar. But if they are different, we have to rely
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* on the vendor id and device id extracted from the compatible
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* string and locate the real bdf by pci_find_device(). This is
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* because normally we may only know device's device number and
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* function number when writing device tree. The bus number is
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* dynamically assigned during the pci enumeration process.
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*/
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if ((dt_vendor != vendor) || (dt_device != device)) {
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*bdf = pci_find_device(dt_vendor, dt_device, 0);
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if (*bdf == -1)
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return -ENODEV;
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}
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return 0;
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}
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int fdtdec_get_pci_bar32(const void *blob, int node,
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struct fdt_pci_addr *addr, u32 *bar)
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{
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pci_dev_t bdf;
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int barnum;
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int ret;
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/* get pci devices's bdf */
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ret = fdtdec_get_pci_bdf(blob, node, addr, &bdf);
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if (ret)
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return ret;
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/* extract the bar number from fdt_pci_addr */
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barnum = addr->phys_hi & 0xff;
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if ((barnum < PCI_BASE_ADDRESS_0) || (barnum > PCI_CARDBUS_CIS))
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return -EINVAL;
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barnum = (barnum - PCI_BASE_ADDRESS_0) / 4;
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*bar = pci_read_bar32(pci_bus_to_hose(PCI_BUS(bdf)), bdf, barnum);
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return 0;
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}
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#endif
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uint64_t fdtdec_get_uint64(const void *blob, int node, const char *prop_name,
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uint64_t default_val)
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{
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@ -795,20 +952,6 @@ int fdt_get_named_resource(const void *fdt, int node, const char *property,
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return fdt_get_resource(fdt, node, property, index, res);
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}
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int fdtdec_pci_get_bdf(const void *fdt, int node, int *bdf)
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{
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const fdt32_t *prop;
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int len;
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prop = fdt_getprop(fdt, node, "reg", &len);
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if (!prop)
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return len;
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*bdf = fdt32_to_cpu(*prop) & 0xffffff;
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return 0;
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}
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int fdtdec_decode_memory_region(const void *blob, int config_node,
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const char *mem_type, const char *suffix,
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fdt_addr_t *basep, fdt_size_t *sizep)
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