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Fri, 08 May 2026 07:39:40 -0700 (PDT) From: Jihong Min To: Greg Kroah-Hartman , Mathias Nyman Cc: Guenter Roeck , Jonathan Corbet , Shuah Khan , Mario Limonciello , Basavaraj Natikar , linux-usb@vger.kernel.org, linux-hwmon@vger.kernel.org, linux-doc@vger.kernel.org, linux-pci@vger.kernel.org, linux-kernel@vger.kernel.org, Jihong Min Subject: [PATCH v4 1/2] usb: xhci-pci: add AMD Promontory 21 PCI glue Date: Fri, 8 May 2026 23:39:09 +0900 Message-ID: <20260508143910.14673-2-hurryman2212@gmail.com> X-Mailer: git-send-email 2.53.0 In-Reply-To: <20260508143910.14673-1-hurryman2212@gmail.com> References: <20260508143910.14673-1-hurryman2212@gmail.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit AMD Promontory 21 (PROM21) xHCI controllers use generic xHCI operation, but the PCI function also exposes optional controller-specific sensor functionality. Add a small PROM21 PCI glue driver for AMD 1022:43fd controllers. The driver delegates USB host operation to the common xhci-pci core and creates a "hwmon" auxiliary device for optional child drivers. Failure to create the auxiliary device is logged but does not fail the xHCI probe, since the auxiliary device is only needed for sensor support. Keep the PROM21 PCI glue built-in only when enabled because it owns the PCI binding for PROM21 xHCI controllers and must be available whenever the common built-in xhci-pci driver hands those controllers off. This avoids an early boot case where generic xhci-pci rejects a PROM21 controller but a modular xhci-pci-prom21 driver is not available in the initramfs, leaving USB devices behind that controller unavailable. Assisted-by: Codex:gpt-5.5 Signed-off-by: Jihong Min --- drivers/usb/host/Kconfig | 18 +++++ drivers/usb/host/Makefile | 1 + drivers/usb/host/xhci-pci-prom21.c | 111 +++++++++++++++++++++++++++++ drivers/usb/host/xhci-pci.c | 11 +++ 4 files changed, 141 insertions(+) create mode 100644 drivers/usb/host/xhci-pci-prom21.c diff --git a/drivers/usb/host/Kconfig b/drivers/usb/host/Kconfig index 0a277a07cf70..74eedef1440d 100644 --- a/drivers/usb/host/Kconfig +++ b/drivers/usb/host/Kconfig @@ -42,6 +42,24 @@ config USB_XHCI_PCI depends on USB_PCI default y +config USB_XHCI_PCI_PROM21 + bool "AMD Promontory 21 xHCI PCI support" + depends on USB_XHCI_PCI=y + select AUXILIARY_BUS + help + Say 'Y' to enable support for the AMD Promontory 21 xHCI PCI + controller with optional sensor support. This driver does not add + PROM21-specific USB or xHCI operation. It binds PROM21 xHCI PCI + functions, delegates USB host operation to the common xHCI PCI core, + and creates auxiliary devices for optional sensor drivers. + + This driver is built-in only because it owns the PCI binding for + PROM21 xHCI controllers when enabled and must be available whenever + the common xHCI PCI driver is available. The optional sensor driver + can still be built as a module. + + If unsure, say 'N'. + config USB_XHCI_PCI_RENESAS tristate "Support for additional Renesas xHCI controller with firmware" depends on USB_XHCI_PCI diff --git a/drivers/usb/host/Makefile b/drivers/usb/host/Makefile index a07e7ba9cd53..174580c1281a 100644 --- a/drivers/usb/host/Makefile +++ b/drivers/usb/host/Makefile @@ -71,6 +71,7 @@ obj-$(CONFIG_USB_UHCI_HCD) += uhci-hcd.o obj-$(CONFIG_USB_FHCI_HCD) += fhci.o obj-$(CONFIG_USB_XHCI_HCD) += xhci-hcd.o obj-$(CONFIG_USB_XHCI_PCI) += xhci-pci.o +obj-$(CONFIG_USB_XHCI_PCI_PROM21) += xhci-pci-prom21.o obj-$(CONFIG_USB_XHCI_PCI_RENESAS) += xhci-pci-renesas.o obj-$(CONFIG_USB_XHCI_PLATFORM) += xhci-plat-hcd.o obj-$(CONFIG_USB_XHCI_HISTB) += xhci-histb.o diff --git a/drivers/usb/host/xhci-pci-prom21.c b/drivers/usb/host/xhci-pci-prom21.c new file mode 100644 index 000000000000..7354a898732e --- /dev/null +++ b/drivers/usb/host/xhci-pci-prom21.c @@ -0,0 +1,111 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * AMD Promontory 21 xHCI host controller PCI Bus Glue. + * + * This does not add any PROM21-specific USB or xHCI operation. It exists only + * to publish an auxiliary device for integrated temperature sensor support. + * + * Copyright (C) 2026 Jihong Min + */ + +#include +#include +#include +#include +#include +#include +#include +#include + +#include "xhci-pci.h" + +struct prom21_xhci_auxdev { + struct auxiliary_device *auxdev; +}; + +static void prom21_xhci_auxdev_release(struct device *dev, void *res) +{ + struct prom21_xhci_auxdev *prom21_auxdev = res; + + auxiliary_device_destroy(prom21_auxdev->auxdev); +} + +static int prom21_xhci_create_auxdev(struct pci_dev *pdev) +{ + struct prom21_xhci_auxdev *prom21_auxdev; + + prom21_auxdev = devres_alloc(prom21_xhci_auxdev_release, + sizeof(*prom21_auxdev), GFP_KERNEL); + if (!prom21_auxdev) + return -ENOMEM; + + prom21_auxdev->auxdev = + auxiliary_device_create(&pdev->dev, KBUILD_MODNAME, "hwmon", + NULL, (pci_domain_nr(pdev->bus) << 16) | + pci_dev_id(pdev)); + if (!prom21_auxdev->auxdev) { + devres_free(prom21_auxdev); + return -ENOMEM; + } + + devres_add(&pdev->dev, prom21_auxdev); + return 0; +} + +static void prom21_xhci_destroy_auxdev(struct pci_dev *pdev) +{ + devres_release(&pdev->dev, prom21_xhci_auxdev_release, NULL, NULL); +} + +static int prom21_xhci_probe(struct pci_dev *dev, + const struct pci_device_id *id) +{ + int retval; + + retval = xhci_pci_common_probe(dev, id); + if (retval) + return retval; + + retval = prom21_xhci_create_auxdev(dev); + if (retval) { + /* + * The auxiliary device only provides optional temperature sensor + * support. Keep the xHCI controller usable if it fails. + */ + dev_err(&dev->dev, + "failed to create PROM21 hwmon auxiliary device: %d\n", + retval); + } + + return 0; +} + +static void prom21_xhci_remove(struct pci_dev *dev) +{ + prom21_xhci_destroy_auxdev(dev); + xhci_pci_remove(dev); +} + +static const struct pci_device_id pci_ids[] = { + { PCI_DEVICE(PCI_VENDOR_ID_AMD, 0x43fd) }, /* PROM21 xHCI */ + { /* end: all zeroes */ } +}; +MODULE_DEVICE_TABLE(pci, pci_ids); + +static struct pci_driver prom21_xhci_driver = { + .name = "xhci-pci-prom21", + .id_table = pci_ids, + + .probe = prom21_xhci_probe, + .remove = prom21_xhci_remove, + + .shutdown = usb_hcd_pci_shutdown, + .driver = { + .pm = pm_ptr(&usb_hcd_pci_pm_ops), + }, +}; +module_pci_driver(prom21_xhci_driver); + +MODULE_DESCRIPTION("AMD Promontory 21 xHCI PCI Host Controller Driver"); +MODULE_IMPORT_NS("xhci"); +MODULE_LICENSE("GPL"); diff --git a/drivers/usb/host/xhci-pci.c b/drivers/usb/host/xhci-pci.c index 585b2f3117b0..5db427ad0422 100644 --- a/drivers/usb/host/xhci-pci.c +++ b/drivers/usb/host/xhci-pci.c @@ -84,6 +84,7 @@ #define PCI_DEVICE_ID_AMD_PROMONTORYA_3 0x43ba #define PCI_DEVICE_ID_AMD_PROMONTORYA_2 0x43bb #define PCI_DEVICE_ID_AMD_PROMONTORYA_1 0x43bc +#define PCI_DEVICE_ID_AMD_PROM21_XHCI 0x43fd #define PCI_DEVICE_ID_ATI_NAVI10_7316_XHCI 0x7316 @@ -696,12 +697,22 @@ static const struct pci_device_id pci_ids_renesas[] = { { /* end: all zeroes */ } }; +/* handled by xhci-pci-prom21 if enabled */ +static const struct pci_device_id pci_ids_prom21[] = { + { PCI_DEVICE(PCI_VENDOR_ID_AMD, PCI_DEVICE_ID_AMD_PROM21_XHCI) }, + { /* end: all zeroes */ } +}; + static int xhci_pci_probe(struct pci_dev *dev, const struct pci_device_id *id) { if (IS_ENABLED(CONFIG_USB_XHCI_PCI_RENESAS) && pci_match_id(pci_ids_renesas, dev)) return -ENODEV; + if (IS_ENABLED(CONFIG_USB_XHCI_PCI_PROM21) && + pci_match_id(pci_ids_prom21, dev)) + return -ENODEV; + return xhci_pci_common_probe(dev, id); } -- 2.53.0