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XHCI perform init sequence
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This commit is contained in:
Kamil Kowalczyk
2026-03-22 18:39:53 +01:00
parent 08e99e6378
commit 5cdeb87393
1 changed files with 36 additions and 0 deletions
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36
kernel/device/xhci.c
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@@ -9,6 +9,11 @@
#include <proc/reschedule.h>
#include <proc/suspension_q.h>
#include <sys/debug.h>
#include <sys/spin_lock.h>
/* REF:
* https://www.intel.com/content/dam/www/public/us/en/documents/technical-specifications/extensible-host-controler-interface-usb-xhci.pdf
*/
/* clang-format off */
@@ -97,6 +102,37 @@ DEFINE_DEVICE_INIT (xhci_init) {
uint32_t dboff = xhci_read32 (xhci->xhci_mmio_base, XHCI_DBOFF);
xhci->xhci_doorbell_base = xhci->xhci_mmio_base + dboff;
DEBUG ("starting init sequence\n");
/* assert CNR is 0 */
while (xhci_read32 (xhci->xhci_oper_base, XHCI_USBSTS) & (1 << 11))
spin_lock_relax ();
/* STOP */
uint32_t usbcmd = xhci_read32 (xhci->xhci_oper_base, XHCI_USBCMD);
xhci_write32 (xhci->xhci_oper_base, XHCI_USBCMD, usbcmd & ~0x01);
/* wait for HCH bit */
int timeout = 100000;
while (!(xhci_read32 (xhci->xhci_oper_base, XHCI_USBSTS) & (1 << 12))) {
if (--timeout == 0)
break;
spin_lock_relax ();
}
/* RESET */
xhci_write32 (xhci->xhci_oper_base, XHCI_USBCMD, (1 << 1));
while (xhci_read32 (xhci->xhci_oper_base, XHCI_USBCMD) & (1 << 1))
spin_lock_relax ();
/* Stall while controller not ready */
while (xhci_read32 (xhci->xhci_oper_base, XHCI_USBSTS) & (1 << 11))
spin_lock_relax ();
DEBUG ("XHCI init done\n");
return true;
}