From f5325a0dec76f15ce2d0ba28719cc78710b63574 Mon Sep 17 00:00:00 2001
From: Ian Moffett <ian@osmora.org>
Date: Fri, 5 Apr 2024 20:03:21 -0400
Subject: kernel: xhci: Add xhci_init_evring()

Add event ring init routine

Signed-off-by: Ian Moffett <ian@osmora.org>
---
 sys/dev/usb/xhci.c            | 39 ++++++++++++++++++++++++++++++++++++++-
 sys/include/dev/usb/xhcivar.h |  1 +
 2 files changed, 39 insertions(+), 1 deletion(-)

diff --git a/sys/dev/usb/xhci.c b/sys/dev/usb/xhci.c
index 5659d61..d68eeac 100644
--- a/sys/dev/usb/xhci.c
+++ b/sys/dev/usb/xhci.c
@@ -382,6 +382,43 @@ xhci_alloc_evring(struct xhci_hc *hc)
     return VIRT_TO_PHYS(hc->evring_seg);
 }
 
+/*
+ * Sets up the event ring.
+ */
+static void
+xhci_init_evring(struct xhci_hc *hc)
+{
+    struct xhci_caps *caps = XHCI_CAPS(hc->base);
+    struct xhci_evring_segment *seg;
+    uint64_t *erdp, *erstba;
+    uint32_t *erst_size;
+    void *runtime = XHCI_RTS(hc->base, caps->rtsoff);
+    size_t size;
+
+    size = XHCI_EVRING_LEN * XHCI_TRB_SIZE;
+    seg = dynalloc_memalign(size, 64);
+    memset(seg, 0, size);
+
+    /* Set the size of the event ring segment table */
+    erst_size = XHCI_BASE_OFF(runtime, 0x28);
+    *erst_size = 1;
+
+    /* Setup the event ring segment */
+    memset(seg, 0, size);
+    seg->base = VIRT_TO_PHYS(seg);
+    seg->size = XHCI_EVRING_LEN;
+
+    /* Setup the event ring dequeue pointer */
+    erdp = XHCI_BASE_OFF(runtime, 0x38);
+    *erdp = seg->base;
+
+    /* Point ERSTBA to our event ring segment */
+    erstba = XHCI_BASE_OFF(runtime, 0x30);
+    *erstba = VIRT_TO_PHYS(seg);
+
+    hc->event_ring = PHYS_TO_VIRT(seg->base);
+}
+
 static int
 xhci_init_hc(struct xhci_hc *hc)
 {
@@ -412,8 +449,8 @@ xhci_init_hc(struct xhci_hc *hc)
     /* Allocate resources and tell the HC about them */
     opregs->dcbaa_ptr = xhci_alloc_dcbaa(hc);
     xhci_init_scratchpads(hc);
+    xhci_init_evring(hc);
     opregs->cmd_ring = xhci_alloc_cmdring(hc);
-    xhci_set_erst_base(hc, xhci_alloc_evring(hc));
 
     /* We're ready, start up the HC and ports */
     xhci_start_hc(hc);
diff --git a/sys/include/dev/usb/xhcivar.h b/sys/include/dev/usb/xhcivar.h
index ca9ccd4..71c1f20 100644
--- a/sys/include/dev/usb/xhcivar.h
+++ b/sys/include/dev/usb/xhcivar.h
@@ -100,6 +100,7 @@ struct xhci_hc {
     uint16_t cmd_ptr;   /* Command ring index  */
     uint16_t cmd_count; /* Command ring entry count */
     uint32_t *cmd_ring;
+    uint32_t *event_ring;
     struct xhci_opregs *opregs;
     struct xhci_proto protos[XHCI_MAX_PROTOS];
     struct xhci_evring_segment *evring_seg;
-- 
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