1 // SPDX-License-Identifier: GPL-2.0
3 * XHCI extended capability handling
5 * Copyright (c) 2017 Hans de Goede <hdegoede@redhat.com>
8 #include <linux/platform_device.h>
9 #include <linux/property.h>
10 #include <linux/pci.h>
13 #define USB_SW_DRV_NAME "intel_xhci_usb_sw"
14 #define USB_SW_RESOURCE_SIZE 0x400
16 #define PCI_DEVICE_ID_INTEL_CHERRYVIEW_XHCI 0x22b5
18 static const struct property_entry role_switch_props
[] = {
19 PROPERTY_ENTRY_BOOL("sw_switch_disable"),
23 static void xhci_intel_unregister_pdev(void *arg
)
25 platform_device_unregister(arg
);
28 static int xhci_create_intel_xhci_sw_pdev(struct xhci_hcd
*xhci
, u32 cap_offset
)
30 struct usb_hcd
*hcd
= xhci_to_hcd(xhci
);
31 struct device
*dev
= hcd
->self
.controller
;
32 struct platform_device
*pdev
;
33 struct pci_dev
*pci
= to_pci_dev(dev
);
34 struct resource res
= { 0, };
37 pdev
= platform_device_alloc(USB_SW_DRV_NAME
, PLATFORM_DEVID_NONE
);
39 xhci_err(xhci
, "couldn't allocate %s platform device\n",
44 res
.start
= hcd
->rsrc_start
+ cap_offset
;
45 res
.end
= res
.start
+ USB_SW_RESOURCE_SIZE
- 1;
46 res
.name
= USB_SW_DRV_NAME
;
47 res
.flags
= IORESOURCE_MEM
;
49 ret
= platform_device_add_resources(pdev
, &res
, 1);
51 dev_err(dev
, "couldn't add resources to intel_xhci_usb_sw pdev\n");
52 platform_device_put(pdev
);
56 if (pci
->device
== PCI_DEVICE_ID_INTEL_CHERRYVIEW_XHCI
) {
57 ret
= device_create_managed_software_node(&pdev
->dev
, role_switch_props
,
60 dev_err(dev
, "failed to register device properties\n");
61 platform_device_put(pdev
);
66 pdev
->dev
.parent
= dev
;
68 ret
= platform_device_add(pdev
);
70 dev_err(dev
, "couldn't register intel_xhci_usb_sw pdev\n");
71 platform_device_put(pdev
);
75 ret
= devm_add_action_or_reset(dev
, xhci_intel_unregister_pdev
, pdev
);
77 dev_err(dev
, "couldn't add unregister action for intel_xhci_usb_sw pdev\n");
84 int xhci_ext_cap_init(struct xhci_hcd
*xhci
)
86 void __iomem
*base
= &xhci
->cap_regs
->hc_capbase
;
90 offset
= xhci_find_next_ext_cap(base
, 0, 0);
93 val
= readl(base
+ offset
);
95 switch (XHCI_EXT_CAPS_ID(val
)) {
96 case XHCI_EXT_CAPS_VENDOR_INTEL
:
97 if (xhci
->quirks
& XHCI_INTEL_USB_ROLE_SW
) {
98 ret
= xhci_create_intel_xhci_sw_pdev(xhci
,
105 offset
= xhci_find_next_ext_cap(base
, offset
, 0);
110 EXPORT_SYMBOL_GPL(xhci_ext_cap_init
);