diff options
| -rw-r--r-- | doc/device-tree-bindings/pci/x86-pci.txt | 7 | ||||
| -rw-r--r-- | drivers/pci/pci-uclass.c | 33 | ||||
| -rw-r--r-- | include/dt-bindings/pci/pci.h | 12 | ||||
| -rw-r--r-- | include/pci.h | 1 |
4 files changed, 50 insertions, 3 deletions
diff --git a/doc/device-tree-bindings/pci/x86-pci.txt b/doc/device-tree-bindings/pci/x86-pci.txt index 95e370b3e7..cf4e5ed595 100644 --- a/doc/device-tree-bindings/pci/x86-pci.txt +++ b/doc/device-tree-bindings/pci/x86-pci.txt @@ -20,6 +20,10 @@ For PCI devices the following optional property is available: output to be lost. This should not generally be used in production code, although it is often harmless. +- u-boot,pci-pre-reloc : List of vendor/device IDs to bind before relocation, even + if they are not bridges. This is useful if the device is needed (e.g. a + UART). The format is 0xvvvvdddd where d is the device ID and v is the + vendor ID. Example: @@ -32,7 +36,8 @@ pci { 0x42000000 0x0 0xb0000000 0xb0000000 0 0x10000000 0x01000000 0x0 0x1000 0x1000 0 0xefff>; u-boot,skip-auto-config-until-reloc; - + u-boot,pci-pre-reloc = < + PCI_VENDEV(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_APL_UART2)>; serial: serial@18,2 { reg = <0x0200c210 0 0 0 0>; diff --git a/drivers/pci/pci-uclass.c b/drivers/pci/pci-uclass.c index 67838b94f9..fb12732926 100644 --- a/drivers/pci/pci-uclass.c +++ b/drivers/pci/pci-uclass.c @@ -21,6 +21,7 @@ #if defined(CONFIG_X86) && defined(CONFIG_HAVE_FSP) #include <asm/fsp/fsp_support.h> #endif +#include <dt-bindings/pci/pci.h> #include <linux/delay.h> #include "pci_internal.h" @@ -682,6 +683,34 @@ static bool pci_match_one_id(const struct pci_device_id *id, } /** + * pci_need_device_pre_reloc() - Check if a device should be bound + * + * This checks a list of vendor/device-ID values indicating devices that should + * be bound before relocation. + * + * @bus: Bus to check + * @vendor: Vendor ID to check + * @device: Device ID to check + * @return true if the vendor/device is in the list, false if not + */ +static bool pci_need_device_pre_reloc(struct udevice *bus, uint vendor, + uint device) +{ + u32 vendev; + int index; + + for (index = 0; + !dev_read_u32_index(bus, "u-boot,pci-pre-reloc", index, + &vendev); + index++) { + if (vendev == PCI_VENDEV(vendor, device)) + return true; + } + + return false; +} + +/** * pci_find_and_bind_driver() - Find and bind the right PCI driver * * This only looks at certain fields in the descriptor. @@ -769,7 +798,9 @@ static int pci_find_and_bind_driver(struct udevice *parent, * precious memory space as on some platforms as that space is pretty * limited (ie: using Cache As RAM). */ - if (!(gd->flags & GD_FLG_RELOC) && !bridge) + if (!(gd->flags & GD_FLG_RELOC) && !bridge && + !pci_need_device_pre_reloc(parent, find_id->vendor, + find_id->device)) return log_msg_ret("notbr", -EPERM); /* Bind a generic driver so that the device can be used */ diff --git a/include/dt-bindings/pci/pci.h b/include/dt-bindings/pci/pci.h new file mode 100644 index 0000000000..e7290277b9 --- /dev/null +++ b/include/dt-bindings/pci/pci.h @@ -0,0 +1,12 @@ +/* SPDX-License-Identifier: GPL-2.0+ */ +/* + * This header provides common constants for PCI bindings. + */ + +#ifndef _DT_BINDINGS_PCI_PCI_H +#define _DT_BINDINGS_PCI_PCI_H + +/* Encode a vendor and device ID into a single cell */ +#define PCI_VENDEV(v, d) (((v) << 16) | (d)) + +#endif /* _DT_BINDINGS_PCI_PCI_H */ diff --git a/include/pci.h b/include/pci.h index 9a8ba03c8d..258c8f831c 100644 --- a/include/pci.h +++ b/include/pci.h @@ -578,7 +578,6 @@ typedef int pci_dev_t; #define PCI_MASK_BUS(bdf) ((bdf) & 0xffff) #define PCI_ADD_BUS(bus, devfn) (((bus) << 16) | (devfn)) #define PCI_BDF(b, d, f) ((b) << 16 | PCI_DEVFN(d, f)) -#define PCI_VENDEV(v, d) (((v) << 16) | (d)) #define PCI_ANY_ID (~0) /* Convert from Linux format to U-Boot format */ |