Hi,
On 16-02-18 14:53, Andy Shevchenko wrote:
On Fri, Feb 16, 2018 at 12:47 PM, Hans de Goede <hdegoede@xxxxxxxxxx> wrote:
The xHCI controller on various Intel SoCs has an extended cap mmio-range
which contains registers to control the muxing to the xHCI (host mode)
or the dwc3 (device mode) and vbus-detection for the otg usb-phy.
Having a role-sw driver included in the xhci code (under drivers/usb/host)
is not desirable. So this commit adds a simple handler for this extended
capability, which creates a platform device with the caps mmio region as
resource, this allows us to write a separate platform role-sw driver for
the role-switch.
Note this commit adds a call to the new xhci_ext_cap_init() function
to xhci_pci_probe(), it is added here because xhci_ext_cap_init() must
be called only once. If in the future we also want to handle ext-caps
on non pci xHCI HCDs from xhci_ext_cap_init() a call to it should also
be added to other bus probe paths.
SPDX?
Ack, fixed for v2.
+/*
+ * XHCI extended capability handling
+ *
+ * Copyright (c) 2017 Hans de Goede <hdegoede@xxxxxxxxxx>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+ pdev = platform_device_alloc("intel_xhci_usb_sw", PLATFORM_DEVID_NONE);
Perhaps,
#define USB_SW_DRV_NAME "..."
Ack, fixed for v2.
+ if (!pdev) {
+ xhci_err(xhci, "couldn't allocate intel_xhci_usb_sw pdev\n");
...and re-use it everywhere here.
pdev -> platform device.
+ return -ENOMEM;
+ }
+
+ res.start = hcd->rsrc_start + cap_offset;
+ res.end = res.start + 0x3ff;
Is this magic always the same? Where its value comes from?
At least define with comment.
Ack, I've added a USB_SW_RESOURCE_SIZE #define for this for v2.
+int xhci_ext_cap_init(struct xhci_hcd *xhci)
+{
+ void __iomem *base = &xhci->cap_regs->hc_capbase;
+ u32 cap_offset, val;
+ int ret;
+
+ cap_offset = xhci_find_next_ext_cap(base, 0, 0);
+
+ while (cap_offset) {
+ val = readl(base + cap_offset);
+
+ switch (XHCI_EXT_CAPS_ID(val)) {
+ case XHCI_EXT_CAPS_VENDOR_INTEL:
+ if (xhci->quirks & XHCI_INTEL_USB_ROLE_SW) {
+ ret = xhci_create_intel_xhci_sw_pdev(
+ xhci, cap_offset);
Can we leave xhci on previous line?
Fixed for v2.
+ if (ret)
+ return ret;
+ }
+ break;
+ }
+ cap_offset = xhci_find_next_ext_cap(base, cap_offset, 0);
+ }
+
+ return 0;
+}
Regards,
Hans
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