[PATCH v5 12/18] hw/usb/hcd-ehci: Implement 64-bit qTD descriptor addressing

[Jamin Lin <jamin_lin@aspeedtech.com>]

EHCI supports 64-bit addressing when the 64-bit Addressing Capability
bit in HCCPARAMS is set. In that mode, the CTRLDSSEGMENT register
provides the upper 32 bits that are concatenated with 32-bit link
pointer values to form 64-bit control data structure addresses
(EHCI 1.0, section 2.3.5 and Appendix B).

qTD link pointers (current_qtd/next_qtd/altnext_qtd and qTD.next)
are stored as 32-bit values in the data structures and must be
expanded to full 64-bit descriptor addresses when 64-bit mode is
enabled. Update the qTD traversal paths to use ehci_get_desc_addr()
when following link pointers.

Appendix B also defines high dword fields for qTD buffer pointers.
Add bufptr_hi[5] to EHCIqtd and extend qTD fetch and QH overlay
handling to load and propagate the high buffer pointer fields.

When 64-bit capability is disabled, descriptor and buffer addresses
remain 32-bit and existing behaviour is unchanged.

Signed-off-by: Jamin Lin <jamin_lin@aspeedtech.com>
Reviewed-by: Philippe Mathieu-Daudé <philmd@linaro.org>
---
 hw/usb/hcd-ehci.h |  1 +
 hw/usb/hcd-ehci.c | 19 ++++++++++++-------
 2 files changed, 13 insertions(+), 7 deletions(-)

diff --git a/hw/usb/hcd-ehci.h b/hw/usb/hcd-ehci.h
index 3428839ec6..fc66aacd9f 100644
--- a/hw/usb/hcd-ehci.h
+++ b/hw/usb/hcd-ehci.h
@@ -139,6 +139,7 @@ typedef struct EHCIqtd {
     uint32_t bufptr[5];               /* Standard buffer pointer */
 #define QTD_BUFPTR_MASK               0xfffff000
 #define QTD_BUFPTR_SH                 12
+    uint32_t bufptr_hi[5];
 } EHCIqtd;
 
 /* QH overlay: altnext_qtd, token, bufptr[5], bufptr_hi[5] */
diff --git a/hw/usb/hcd-ehci.c b/hw/usb/hcd-ehci.c
index 5ffd4c9885..e82e0f625c 100644
--- a/hw/usb/hcd-ehci.c
+++ b/hw/usb/hcd-ehci.c
@@ -472,7 +472,8 @@ static bool ehci_verify_qtd(EHCIPacket *p, EHCIqtd *qtd)
             (p->qtd.next != qtd->next)) ||
         (!NLPTR_TBIT(p->qtd.altnext) && (p->qtd.altnext != qtd->altnext)) ||
         p->qtd.token != qtd->token ||
-        p->qtd.bufptr[0] != qtd->bufptr[0]) {
+        p->qtd.bufptr[0] != qtd->bufptr[0] ||
+        p->qtd.bufptr_hi[0] != qtd->bufptr_hi[0]) {
         return false;
     } else {
         return true;
@@ -1200,6 +1201,7 @@ static int ehci_qh_do_overlay(EHCIQueue *q)
 
     for (i = 0; i < 5; i++) {
         q->qh.bufptr[i] = p->qtd.bufptr[i];
+        q->qh.bufptr_hi[i] = p->qtd.bufptr_hi[i];
     }
 
     if (!(q->qh.epchar & QH_EPCHAR_DTC)) {
@@ -1233,7 +1235,8 @@ static int ehci_init_transfer(EHCIPacket *p)
             return -1;
         }
 
-        page  = p->qtd.bufptr[cpage] & QTD_BUFPTR_MASK;
+        page = ehci_get_buf_addr(p->queue->ehci, p->qtd.bufptr_hi[cpage],
+                                 p->qtd.bufptr[cpage], QTD_BUFPTR_MASK);
         page += offset;
         plen  = bytes;
         if (plen > 4096 - offset) {
@@ -1727,7 +1730,7 @@ static EHCIQueue *ehci_state_fetchqh(EHCIState *ehci, int async)
     } else if ((q->qh.token & QTD_TOKEN_ACTIVE) &&
                (NLPTR_TBIT(q->qh.current_qtd) == 0) &&
                (q->qh.current_qtd != 0)) {
-        q->qtdaddr = q->qh.current_qtd;
+        q->qtdaddr = ehci_get_desc_addr(ehci, q->qh.current_qtd);
         ehci_set_state(ehci, async, EST_FETCHQTD);
 
     } else {
@@ -1805,14 +1808,14 @@ static int ehci_state_advqueue(EHCIQueue *q)
      */
     if (((q->qh.token & QTD_TOKEN_TBYTES_MASK) != 0) &&
         (NLPTR_TBIT(q->qh.altnext_qtd) == 0)) {
-        q->qtdaddr = q->qh.altnext_qtd;
+        q->qtdaddr = ehci_get_desc_addr(q->ehci, q->qh.altnext_qtd);
         ehci_set_state(q->ehci, q->async, EST_FETCHQTD);
 
     /*
      *  next qTD is valid
      */
     } else if (NLPTR_TBIT(q->qh.next_qtd) == 0) {
-        q->qtdaddr = q->qh.next_qtd;
+        q->qtdaddr = ehci_get_desc_addr(q->ehci, q->qh.next_qtd);
         ehci_set_state(q->ehci, q->async, EST_FETCHQTD);
 
     /*
@@ -1841,7 +1844,9 @@ static int ehci_state_fetchqtd(EHCIQueue *q)
     if (get_dwords(q->ehci, addr +  0, &qtd.next,    1) < 0 ||
         get_dwords(q->ehci, addr +  4, &qtd.altnext, 1) < 0 ||
         get_dwords(q->ehci, addr + 12, qtd.bufptr,
-                   ARRAY_SIZE(qtd.bufptr)) < 0) {
+                   ARRAY_SIZE(qtd.bufptr)) < 0 ||
+        get_dwords(q->ehci, addr + 32, qtd.bufptr_hi,
+                   ARRAY_SIZE(qtd.bufptr_hi)) < 0) {
         return 0;
     }
     ehci_trace_qtd(q, NLPTR_GET(q->qtdaddr), &qtd);
@@ -1922,7 +1927,7 @@ static int ehci_fill_queue(EHCIPacket *p)
         if (NLPTR_TBIT(qtd.next) != 0) {
             break;
         }
-        qtdaddr = qtd.next;
+        qtdaddr = ehci_get_desc_addr(q->ehci, qtd.next);
         /*
          * Detect circular td lists, Windows creates these, counting on the
          * active bit going low after execution to make the queue stop.
-- 
2.43.0