dm: pci: Add a uclass for PCI
Add a uclass for PCI controllers and a generic one for PCI devices. Adjust
the 'pci' command and the existing PCI support to work with this new uclass.
Keep most of the compatibility code in a separate file so that it can be
removed one day.
TODO: Add more header file comments to the new parts of pci.h
Signed-off-by: Simon Glass <sjg@chromium.org>
diff --git a/drivers/pci/pci-uclass.c b/drivers/pci/pci-uclass.c
new file mode 100644
index 0000000..d48d865
--- /dev/null
+++ b/drivers/pci/pci-uclass.c
@@ -0,0 +1,639 @@
+/*
+ * 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",
+ .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,
+};