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WIP device tree pci extension

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This commit is contained in:
Travis Geiselbrecht
2024-06-16 22:04:01 -07:00
parent 69b8bccd76
commit ede177c94e
1 changed files with 61 additions and 25 deletions
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86
lib/fdtwalk/fdtwalk.cpp
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@@ -9,18 +9,31 @@
#include <assert.h>
#include <libfdt.h>
#include <lk/bits.h>
#include <lk/cpp.h>
#include <lk/err.h>
#include <lk/trace.h>
#include <stdio.h>
#include <sys/types.h>
#define LOCAL_TRACE 0
#define LOCAL_TRACE 3
namespace {
const int MAX_DEPTH = 16;
status_t read_property_32bit(const void *fdt, int offset, const char *prop_name, uint32_t *property) {
int len;
const void *prop_ptr = fdt_getprop(fdt, offset, prop_name, &len);
LTRACEF_LEVEL(3, "%p, len %d\n", prop_ptr, len);
if (prop_ptr && len == 4) {
*property = fdt32_to_cpu(*(const uint32_t *)prop_ptr);
return NO_ERROR;
}
return ERR_NOT_FOUND;
}
/* read the #address-cells and #size-cells properties at the current node to
* see if there are any overriding sizes at this level. It's okay to not
* find the properties.
@@ -31,18 +44,8 @@ void read_address_size_cells(const void *fdt, int offset, int depth,
DEBUG_ASSERT(depth >= 0 && depth < MAX_DEPTH);
int len;
const void *prop_ptr = fdt_getprop(fdt, offset, "#address-cells", &len);
LTRACEF_LEVEL(3, "%p, len %d\n", prop_ptr, len);
if (prop_ptr && len == 4) {
address_cells[depth] = fdt32_to_cpu(*(const uint32_t *)prop_ptr);
}
prop_ptr = fdt_getprop(fdt, offset, "#size-cells", &len);
LTRACEF_LEVEL(3, "%p, len %d\n", prop_ptr, len);
if (prop_ptr && len == 4) {
size_cells[depth] = fdt32_to_cpu(*(const uint32_t *)prop_ptr);
}
read_property_32bit(fdt, offset, "#address-cells", &address_cells[depth]);
read_property_32bit(fdt, offset, "#size-cells", &size_cells[depth]);
LTRACEF_LEVEL(3, "address-cells %u size-cells %u\n", address_cells[depth], size_cells[depth]);
}
@@ -374,36 +377,69 @@ status_t fdt_walk_find_pcie_info(const void *fdt, struct fdt_walk_pcie_info *inf
/* read 3 64bit values */
uint64_t base1, base2, size;
base1 = fdt64_to_cpu(*(const uint64_t *)prop_ptr);
prop_ptr += 8;
base2 = fdt64_to_cpu(*(const uint64_t *)prop_ptr);
prop_ptr += 8;
size = fdt64_to_cpu(*(const uint64_t *)prop_ptr);
prop_ptr += 8;
if (state.curr_size_cell() == 2) {
base1 = fdt64_to_cpu(*(const uint64_t *)prop_ptr);
prop_ptr += 8;
base2 = fdt64_to_cpu(*(const uint64_t *)prop_ptr);
prop_ptr += 8;
size = fdt64_to_cpu(*(const uint64_t *)prop_ptr);
prop_ptr += 8;
} else if (state.curr_size_cell() == 1) {
base1 = fdt32_to_cpu(*(const uint32_t *)prop_ptr);
prop_ptr += 4;
base2 = fdt32_to_cpu(*(const uint32_t *)prop_ptr);
prop_ptr += 4;
size = fdt32_to_cpu(*(const uint32_t *)prop_ptr);
prop_ptr += 4;
} else {
// Don't know how to handle these, so push the pointer forward
// and skip it for now.
printf("FDT: unhandled #size-cell %u in pci node\n", state.curr_size_cell());
prop_ptr += 3 * (state.curr_size_cell() * 4);
continue;
}
switch (type) {
case 0x1000000: // io range
// from https://elinux.org/Device_Tree_Usage#PCI_Address_Translation
// type word is: npt000ss bbbbbbbb dddddfff rrrrrrrr
// n relocatable region
// p prefetable region
// t aliased address flag
// ss space code
switch (BITS_SHIFT(type, 25, 24)) {
case 0: // config space
break;
case 0x1: // io range
LTRACEF_LEVEL(2, "io range\n");
info[*count].io_base = base1;
info[*count].io_base_mmio = base2;
info[*count].io_len = size;
break;
case 0x2000000: // mmio range
case 0x2: // mmio range
LTRACEF_LEVEL(2, "mmio range\n");
info[*count].mmio_base = base1;
info[*count].mmio_len = size;
break;
case 0x3000000: // mmio range (64bit)
case 0x3: // mmio range (64bit)
LTRACEF_LEVEL(2, "mmio range (64bit)\n");
info[*count].mmio64_base = base1;
info[*count].mmio64_len = size;
break;
default:
LTRACEF_LEVEL(2, "unhandled type %#x\n", type);
}
LTRACEF_LEVEL(2, "base %#llx base2 %#llx size %#llx\n", base1, base2, size);
}
}
// handle interrupt map
uint32_t interrupt_cells = 1;
read_property_32bit(state.fdt, state.offset, "#interrupt-cells", &interrupt_cells);
LTRACEF_LEVEL(2, "#interrupt-cells %u\n", interrupt_cells);
// we can only currently handle this combination
if (state.curr_address_cell() == 3 && interrupt_cells == 1) {
}
(*count)++;