u-boot/drivers/pci/pci-uclass.c
Simon Glass 2bb02e4fe2 dm: pci: Allow PCI bus numbering aliases
Commit 9cc36a2 'dm: core: Add a flag to control sequence numbering' changed
the default uclass behaviour to not support bus numbering. This is incorrect
for PCI and that commit should have enabled the flag for PCI.

Enable it so that PCI buses can be found and the 'pci' command works again.
Also add a test for this.

Signed-off-by: Simon Glass <sjg@chromium.org>
2015-06-04 03:34:47 -06:00

640 lines
14 KiB
C

/*
* Copyright (c) 2014 Google, Inc
* Written by Simon Glass <sjg@chromium.org>
*
* SPDX-License-Identifier: GPL-2.0+
*/
#include <common.h>
#include <dm.h>
#include <errno.h>
#include <fdtdec.h>
#include <inttypes.h>
#include <pci.h>
#include <dm/lists.h>
#include <dm/root.h>
#include <dm/device-internal.h>
DECLARE_GLOBAL_DATA_PTR;
struct pci_controller *pci_bus_to_hose(int busnum)
{
struct udevice *bus;
int ret;
ret = uclass_get_device_by_seq(UCLASS_PCI, busnum, &bus);
if (ret) {
debug("%s: Cannot get bus %d: ret=%d\n", __func__, busnum, ret);
return NULL;
}
return dev_get_uclass_priv(bus);
}
/**
* pci_get_bus_max() - returns the bus number of the last active bus
*
* @return last bus number, or -1 if no active buses
*/
static int pci_get_bus_max(void)
{
struct udevice *bus;
struct uclass *uc;
int ret = -1;
ret = uclass_get(UCLASS_PCI, &uc);
uclass_foreach_dev(bus, uc) {
if (bus->seq > ret)
ret = bus->seq;
}
debug("%s: ret=%d\n", __func__, ret);
return ret;
}
int pci_last_busno(void)
{
struct pci_controller *hose;
struct udevice *bus;
struct uclass *uc;
int ret;
debug("pci_last_busno\n");
ret = uclass_get(UCLASS_PCI, &uc);
if (ret || list_empty(&uc->dev_head))
return -1;
/* Probe the last bus */
bus = list_entry(uc->dev_head.prev, struct udevice, uclass_node);
debug("bus = %p, %s\n", bus, bus->name);
assert(bus);
ret = device_probe(bus);
if (ret)
return ret;
/* If that bus has bridges, we may have new buses now. Get the last */
bus = list_entry(uc->dev_head.prev, struct udevice, uclass_node);
hose = dev_get_uclass_priv(bus);
debug("bus = %s, hose = %p\n", bus->name, hose);
return hose->last_busno;
}
int pci_get_ff(enum pci_size_t size)
{
switch (size) {
case PCI_SIZE_8:
return 0xff;
case PCI_SIZE_16:
return 0xffff;
default:
return 0xffffffff;
}
}
int pci_bus_find_devfn(struct udevice *bus, pci_dev_t find_devfn,
struct udevice **devp)
{
struct udevice *dev;
for (device_find_first_child(bus, &dev);
dev;
device_find_next_child(&dev)) {
struct pci_child_platdata *pplat;
pplat = dev_get_parent_platdata(dev);
if (pplat && pplat->devfn == find_devfn) {
*devp = dev;
return 0;
}
}
return -ENODEV;
}
int pci_bus_find_bdf(pci_dev_t bdf, struct udevice **devp)
{
struct udevice *bus;
int ret;
ret = uclass_get_device_by_seq(UCLASS_PCI, PCI_BUS(bdf), &bus);
if (ret)
return ret;
return pci_bus_find_devfn(bus, PCI_MASK_BUS(bdf), devp);
}
static int pci_device_matches_ids(struct udevice *dev,
struct pci_device_id *ids)
{
struct pci_child_platdata *pplat;
int i;
pplat = dev_get_parent_platdata(dev);
if (!pplat)
return -EINVAL;
for (i = 0; ids[i].vendor != 0; i++) {
if (pplat->vendor == ids[i].vendor &&
pplat->device == ids[i].device)
return i;
}
return -EINVAL;
}
int pci_bus_find_devices(struct udevice *bus, struct pci_device_id *ids,
int *indexp, struct udevice **devp)
{
struct udevice *dev;
/* Scan all devices on this bus */
for (device_find_first_child(bus, &dev);
dev;
device_find_next_child(&dev)) {
if (pci_device_matches_ids(dev, ids) >= 0) {
if ((*indexp)-- <= 0) {
*devp = dev;
return 0;
}
}
}
return -ENODEV;
}
int pci_find_device_id(struct pci_device_id *ids, int index,
struct udevice **devp)
{
struct udevice *bus;
/* Scan all known buses */
for (uclass_first_device(UCLASS_PCI, &bus);
bus;
uclass_next_device(&bus)) {
if (!pci_bus_find_devices(bus, ids, &index, devp))
return 0;
}
*devp = NULL;
return -ENODEV;
}
int pci_bus_write_config(struct udevice *bus, pci_dev_t bdf, int offset,
unsigned long value, enum pci_size_t size)
{
struct dm_pci_ops *ops;
ops = pci_get_ops(bus);
if (!ops->write_config)
return -ENOSYS;
return ops->write_config(bus, bdf, offset, value, size);
}
int pci_write_config(pci_dev_t bdf, int offset, unsigned long value,
enum pci_size_t size)
{
struct udevice *bus;
int ret;
ret = uclass_get_device_by_seq(UCLASS_PCI, PCI_BUS(bdf), &bus);
if (ret)
return ret;
return pci_bus_write_config(bus, PCI_MASK_BUS(bdf), offset, value,
size);
}
int pci_write_config32(pci_dev_t bdf, int offset, u32 value)
{
return pci_write_config(bdf, offset, value, PCI_SIZE_32);
}
int pci_write_config16(pci_dev_t bdf, int offset, u16 value)
{
return pci_write_config(bdf, offset, value, PCI_SIZE_16);
}
int pci_write_config8(pci_dev_t bdf, int offset, u8 value)
{
return pci_write_config(bdf, offset, value, PCI_SIZE_8);
}
int pci_bus_read_config(struct udevice *bus, pci_dev_t bdf, int offset,
unsigned long *valuep, enum pci_size_t size)
{
struct dm_pci_ops *ops;
ops = pci_get_ops(bus);
if (!ops->read_config)
return -ENOSYS;
return ops->read_config(bus, bdf, offset, valuep, size);
}
int pci_read_config(pci_dev_t bdf, int offset, unsigned long *valuep,
enum pci_size_t size)
{
struct udevice *bus;
int ret;
ret = uclass_get_device_by_seq(UCLASS_PCI, PCI_BUS(bdf), &bus);
if (ret)
return ret;
return pci_bus_read_config(bus, PCI_MASK_BUS(bdf), offset, valuep,
size);
}
int pci_read_config32(pci_dev_t bdf, int offset, u32 *valuep)
{
unsigned long value;
int ret;
ret = pci_read_config(bdf, offset, &value, PCI_SIZE_32);
if (ret)
return ret;
*valuep = value;
return 0;
}
int pci_read_config16(pci_dev_t bdf, int offset, u16 *valuep)
{
unsigned long value;
int ret;
ret = pci_read_config(bdf, offset, &value, PCI_SIZE_16);
if (ret)
return ret;
*valuep = value;
return 0;
}
int pci_read_config8(pci_dev_t bdf, int offset, u8 *valuep)
{
unsigned long value;
int ret;
ret = pci_read_config(bdf, offset, &value, PCI_SIZE_8);
if (ret)
return ret;
*valuep = value;
return 0;
}
int pci_auto_config_devices(struct udevice *bus)
{
struct pci_controller *hose = bus->uclass_priv;
unsigned int sub_bus;
struct udevice *dev;
int ret;
sub_bus = bus->seq;
debug("%s: start\n", __func__);
pciauto_config_init(hose);
for (ret = device_find_first_child(bus, &dev);
!ret && dev;
ret = device_find_next_child(&dev)) {
struct pci_child_platdata *pplat;
pplat = dev_get_parent_platdata(dev);
unsigned int max_bus;
pci_dev_t bdf;
bdf = PCI_ADD_BUS(bus->seq, pplat->devfn);
debug("%s: device %s\n", __func__, dev->name);
max_bus = pciauto_config_device(hose, bdf);
sub_bus = max(sub_bus, max_bus);
}
debug("%s: done\n", __func__);
return sub_bus;
}
int dm_pci_hose_probe_bus(struct pci_controller *hose, pci_dev_t bdf)
{
struct udevice *parent, *bus;
int sub_bus;
int ret;
debug("%s\n", __func__);
parent = hose->bus;
/* Find the bus within the parent */
ret = pci_bus_find_devfn(parent, bdf, &bus);
if (ret) {
debug("%s: Cannot find device %x on bus %s: %d\n", __func__,
bdf, parent->name, ret);
return ret;
}
sub_bus = pci_get_bus_max() + 1;
debug("%s: bus = %d/%s\n", __func__, sub_bus, bus->name);
pciauto_prescan_setup_bridge(hose, bdf, bus->seq);
ret = device_probe(bus);
if (ret) {
debug("%s: Cannot probe bus bus %s: %d\n", __func__, bus->name,
ret);
return ret;
}
if (sub_bus != bus->seq) {
printf("%s: Internal error, bus '%s' got seq %d, expected %d\n",
__func__, bus->name, bus->seq, sub_bus);
return -EPIPE;
}
sub_bus = pci_get_bus_max();
pciauto_postscan_setup_bridge(hose, bdf, sub_bus);
return sub_bus;
}
int pci_bind_bus_devices(struct udevice *bus)
{
ulong vendor, device;
ulong header_type;
pci_dev_t devfn, end;
bool found_multi;
int ret;
found_multi = false;
end = PCI_DEVFN(PCI_MAX_PCI_DEVICES - 1, PCI_MAX_PCI_FUNCTIONS - 1);
for (devfn = PCI_DEVFN(0, 0); devfn < end; devfn += PCI_DEVFN(0, 1)) {
struct pci_child_platdata *pplat;
struct udevice *dev;
ulong class;
if (PCI_FUNC(devfn) && !found_multi)
continue;
/* Check only the first access, we don't expect problems */
ret = pci_bus_read_config(bus, devfn, PCI_HEADER_TYPE,
&header_type, PCI_SIZE_8);
if (ret)
goto error;
pci_bus_read_config(bus, devfn, PCI_VENDOR_ID, &vendor,
PCI_SIZE_16);
if (vendor == 0xffff || vendor == 0x0000)
continue;
if (!PCI_FUNC(devfn))
found_multi = header_type & 0x80;
debug("%s: bus %d/%s: found device %x, function %d\n", __func__,
bus->seq, bus->name, PCI_DEV(devfn), PCI_FUNC(devfn));
pci_bus_read_config(bus, devfn, PCI_DEVICE_ID, &device,
PCI_SIZE_16);
pci_bus_read_config(bus, devfn, PCI_CLASS_DEVICE, &class,
PCI_SIZE_16);
/* Find this device in the device tree */
ret = pci_bus_find_devfn(bus, devfn, &dev);
/* If nothing in the device tree, bind a generic device */
if (ret == -ENODEV) {
char name[30], *str;
const char *drv;
sprintf(name, "pci_%x:%x.%x", bus->seq,
PCI_DEV(devfn), PCI_FUNC(devfn));
str = strdup(name);
if (!str)
return -ENOMEM;
drv = class == PCI_CLASS_BRIDGE_PCI ?
"pci_bridge_drv" : "pci_generic_drv";
ret = device_bind_driver(bus, drv, str, &dev);
}
if (ret)
return ret;
/* Update the platform data */
pplat = dev_get_parent_platdata(dev);
pplat->devfn = devfn;
pplat->vendor = vendor;
pplat->device = device;
pplat->class = class;
}
return 0;
error:
printf("Cannot read bus configuration: %d\n", ret);
return ret;
}
static int pci_uclass_post_bind(struct udevice *bus)
{
/*
* Scan the device tree for devices. This does not probe the PCI bus,
* as this is not permitted while binding. It just finds devices
* mentioned in the device tree.
*
* Before relocation, only bind devices marked for pre-relocation
* use.
*/
return dm_scan_fdt_node(bus, gd->fdt_blob, bus->of_offset,
gd->flags & GD_FLG_RELOC ? false : true);
}
static int decode_regions(struct pci_controller *hose, const void *blob,
int parent_node, int node)
{
int pci_addr_cells, addr_cells, size_cells;
int cells_per_record;
const u32 *prop;
int len;
int i;
prop = fdt_getprop(blob, node, "ranges", &len);
if (!prop)
return -EINVAL;
pci_addr_cells = fdt_address_cells(blob, node);
addr_cells = fdt_address_cells(blob, parent_node);
size_cells = fdt_size_cells(blob, node);
/* PCI addresses are always 3-cells */
len /= sizeof(u32);
cells_per_record = pci_addr_cells + addr_cells + size_cells;
hose->region_count = 0;
debug("%s: len=%d, cells_per_record=%d\n", __func__, len,
cells_per_record);
for (i = 0; i < MAX_PCI_REGIONS; i++, len -= cells_per_record) {
u64 pci_addr, addr, size;
int space_code;
u32 flags;
int type;
if (len < cells_per_record)
break;
flags = fdt32_to_cpu(prop[0]);
space_code = (flags >> 24) & 3;
pci_addr = fdtdec_get_number(prop + 1, 2);
prop += pci_addr_cells;
addr = fdtdec_get_number(prop, addr_cells);
prop += addr_cells;
size = fdtdec_get_number(prop, size_cells);
prop += size_cells;
debug("%s: region %d, pci_addr=%" PRIx64 ", addr=%" PRIx64
", size=%" PRIx64 ", space_code=%d\n", __func__,
hose->region_count, pci_addr, addr, size, space_code);
if (space_code & 2) {
type = flags & (1U << 30) ? PCI_REGION_PREFETCH :
PCI_REGION_MEM;
} else if (space_code & 1) {
type = PCI_REGION_IO;
} else {
continue;
}
debug(" - type=%d\n", type);
pci_set_region(hose->regions + hose->region_count++, pci_addr,
addr, size, type);
}
/* Add a region for our local memory */
pci_set_region(hose->regions + hose->region_count++, 0, 0,
gd->ram_size, PCI_REGION_MEM | PCI_REGION_SYS_MEMORY);
return 0;
}
static int pci_uclass_pre_probe(struct udevice *bus)
{
struct pci_controller *hose;
int ret;
debug("%s, bus=%d/%s, parent=%s\n", __func__, bus->seq, bus->name,
bus->parent->name);
hose = bus->uclass_priv;
/* For bridges, use the top-level PCI controller */
if (device_get_uclass_id(bus->parent) == UCLASS_ROOT) {
hose->ctlr = bus;
ret = decode_regions(hose, gd->fdt_blob, bus->parent->of_offset,
bus->of_offset);
if (ret) {
debug("%s: Cannot decode regions\n", __func__);
return ret;
}
} else {
struct pci_controller *parent_hose;
parent_hose = dev_get_uclass_priv(bus->parent);
hose->ctlr = parent_hose->bus;
}
hose->bus = bus;
hose->first_busno = bus->seq;
hose->last_busno = bus->seq;
return 0;
}
static int pci_uclass_post_probe(struct udevice *bus)
{
int ret;
/* Don't scan buses before relocation */
if (!(gd->flags & GD_FLG_RELOC))
return 0;
debug("%s: probing bus %d\n", __func__, bus->seq);
ret = pci_bind_bus_devices(bus);
if (ret)
return ret;
#ifdef CONFIG_PCI_PNP
ret = pci_auto_config_devices(bus);
#endif
return ret < 0 ? ret : 0;
}
static int pci_uclass_child_post_bind(struct udevice *dev)
{
struct pci_child_platdata *pplat;
struct fdt_pci_addr addr;
int ret;
if (dev->of_offset == -1)
return 0;
/*
* We could read vendor, device, class if available. But for now we
* just check the address.
*/
pplat = dev_get_parent_platdata(dev);
ret = fdtdec_get_pci_addr(gd->fdt_blob, dev->of_offset,
FDT_PCI_SPACE_CONFIG, "reg", &addr);
if (ret) {
if (ret != -ENOENT)
return -EINVAL;
} else {
/* extract the bdf from fdt_pci_addr */
pplat->devfn = addr.phys_hi & 0xffff00;
}
return 0;
}
int pci_bridge_read_config(struct udevice *bus, pci_dev_t devfn, uint offset,
ulong *valuep, enum pci_size_t size)
{
struct pci_controller *hose = bus->uclass_priv;
pci_dev_t bdf = PCI_ADD_BUS(bus->seq, devfn);
return pci_bus_read_config(hose->ctlr, bdf, offset, valuep, size);
}
int pci_bridge_write_config(struct udevice *bus, pci_dev_t devfn, uint offset,
ulong value, enum pci_size_t size)
{
struct pci_controller *hose = bus->uclass_priv;
pci_dev_t bdf = PCI_ADD_BUS(bus->seq, devfn);
return pci_bus_write_config(hose->ctlr, bdf, offset, value, size);
}
UCLASS_DRIVER(pci) = {
.id = UCLASS_PCI,
.name = "pci",
.flags = DM_UC_FLAG_SEQ_ALIAS,
.post_bind = pci_uclass_post_bind,
.pre_probe = pci_uclass_pre_probe,
.post_probe = pci_uclass_post_probe,
.child_post_bind = pci_uclass_child_post_bind,
.per_device_auto_alloc_size = sizeof(struct pci_controller),
.per_child_platdata_auto_alloc_size =
sizeof(struct pci_child_platdata),
};
static const struct dm_pci_ops pci_bridge_ops = {
.read_config = pci_bridge_read_config,
.write_config = pci_bridge_write_config,
};
static const struct udevice_id pci_bridge_ids[] = {
{ .compatible = "pci-bridge" },
{ }
};
U_BOOT_DRIVER(pci_bridge_drv) = {
.name = "pci_bridge_drv",
.id = UCLASS_PCI,
.of_match = pci_bridge_ids,
.ops = &pci_bridge_ops,
};
UCLASS_DRIVER(pci_generic) = {
.id = UCLASS_PCI_GENERIC,
.name = "pci_generic",
};
static const struct udevice_id pci_generic_ids[] = {
{ .compatible = "pci-generic" },
{ }
};
U_BOOT_DRIVER(pci_generic_drv) = {
.name = "pci_generic_drv",
.id = UCLASS_PCI_GENERIC,
.of_match = pci_generic_ids,
};