UHCI: Add macros for computing DMA values

This patch (as855) adds some convenience macros to uhci-hcd, to help
simplify the code for computing hardware DMA pointers.

Signed-off-by: Alan Stern <stern@rowland.harvard.edu>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

diff --git a/drivers/usb/host/uhci-debug.c b/drivers/usb/host/uhci-debug.c
index 5d6c06b..a067713 100644 (file)
--- a/drivers/usb/host/uhci-debug.c
+++ b/drivers/usb/host/uhci-debug.c
@@ -196,7 +196,7 @@ static int uhci_show_qh(struct uhci_qh *qh, char *buf, int len, int space)
                struct uhci_td *td = list_entry(urbp->td_list.next,
                                struct uhci_td, list);
 
-               if (cpu_to_le32(td->dma_handle) != (element & ~UHCI_PTR_BITS))
+               if (element != LINK_TO_TD(td))
                        out += sprintf(out, "%*s Element != First TD\n",
                                        space, "");
                i = nurbs = 0;
@@ -393,7 +393,7 @@ static int uhci_sprint_schedule(struct uhci_hcd *uhci, char *buf, int len)
                do {
                        td = list_entry(tmp, struct uhci_td, fl_list);
                        tmp = tmp->next;
-                       if (cpu_to_le32(td->dma_handle) != link) {
+                       if (link != LINK_TO_TD(td)) {
                                if (nframes > 0)
                                        out += sprintf(out, "    link does "
                                                "not match list entry!\n");
@@ -440,7 +440,7 @@ check_link:
                        if (qh->link != UHCI_PTR_TERM)
                                out += sprintf(out, "    bandwidth reclamation on!\n");
 
-                       if (qh_element(qh) != cpu_to_le32(uhci->term_td->dma_handle))
+                       if (qh_element(qh) != LINK_TO_TD(uhci->term_td))
                                out += sprintf(out, "    skel_term_qh element is not set to term_td!\n");
 
                        continue;
@@ -461,8 +461,7 @@ check_link:
                        out += sprintf(out, "    Skipped %d QHs\n", cnt);
 
                if (i > 1 && i < UHCI_NUM_SKELQH - 1) {
-                       if (qh->link !=
-                           (cpu_to_le32(uhci->skelqh[j]->dma_handle) | UHCI_PTR_QH))
+                       if (qh->link != LINK_TO_QH(uhci->skelqh[j]))
                                out += sprintf(out, "    last QH not linked to next skeleton!\n");
                }
        }

diff --git a/drivers/usb/host/uhci-hcd.c b/drivers/usb/host/uhci-hcd.c
index ded4df3..1f0833a 100644 (file)
--- a/drivers/usb/host/uhci-hcd.c
+++ b/drivers/usb/host/uhci-hcd.c
@@ -116,7 +116,7 @@ static __le32 uhci_frame_skel_link(struct uhci_hcd *uhci, int frame)
        skelnum = 8 - (int) __ffs(frame | UHCI_NUMFRAMES);
        if (skelnum <= 1)
                skelnum = 9;
-       return UHCI_PTR_QH | cpu_to_le32(uhci->skelqh[skelnum]->dma_handle);
+       return LINK_TO_QH(uhci->skelqh[skelnum]);
 }
 
 #include "uhci-debug.c"
@@ -635,25 +635,21 @@ static int uhci_start(struct usb_hcd *hcd)
                        uhci->skel_int16_qh->link =
                        uhci->skel_int8_qh->link =
                        uhci->skel_int4_qh->link =
-                       uhci->skel_int2_qh->link = UHCI_PTR_QH |
-                       cpu_to_le32(uhci->skel_int1_qh->dma_handle);
-
-       uhci->skel_int1_qh->link = UHCI_PTR_QH |
-                       cpu_to_le32(uhci->skel_ls_control_qh->dma_handle);
-       uhci->skel_ls_control_qh->link = UHCI_PTR_QH |
-                       cpu_to_le32(uhci->skel_fs_control_qh->dma_handle);
-       uhci->skel_fs_control_qh->link = UHCI_PTR_QH |
-                       cpu_to_le32(uhci->skel_bulk_qh->dma_handle);
-       uhci->skel_bulk_qh->link = UHCI_PTR_QH |
-                       cpu_to_le32(uhci->skel_term_qh->dma_handle);
+                       uhci->skel_int2_qh->link = LINK_TO_QH(
+                               uhci->skel_int1_qh);
+
+       uhci->skel_int1_qh->link = LINK_TO_QH(uhci->skel_ls_control_qh);
+       uhci->skel_ls_control_qh->link = LINK_TO_QH(uhci->skel_fs_control_qh);
+       uhci->skel_fs_control_qh->link = LINK_TO_QH(uhci->skel_bulk_qh);
+       uhci->skel_bulk_qh->link = LINK_TO_QH(uhci->skel_term_qh);
 
        /* This dummy TD is to work around a bug in Intel PIIX controllers */
        uhci_fill_td(uhci->term_td, 0, uhci_explen(0) |
                (0x7f << TD_TOKEN_DEVADDR_SHIFT) | USB_PID_IN, 0);
-       uhci->term_td->link = cpu_to_le32(uhci->term_td->dma_handle);
+       uhci->term_td->link = LINK_TO_TD(uhci->term_td);
 
        uhci->skel_term_qh->link = UHCI_PTR_TERM;
-       uhci->skel_term_qh->element = cpu_to_le32(uhci->term_td->dma_handle);
+       uhci->skel_term_qh->element = LINK_TO_TD(uhci->term_td);
 
        /*
         * Fill the frame list: make all entries point to the proper

diff --git a/drivers/usb/host/uhci-hcd.h b/drivers/usb/host/uhci-hcd.h
index 74469b5..a8c256b 100644 (file)
--- a/drivers/usb/host/uhci-hcd.h
+++ b/drivers/usb/host/uhci-hcd.h
@@ -129,6 +129,8 @@ struct uhci_qh {
        __le32 element;                 /* Queue element (TD) pointer */
 
        /* Software fields */
+       dma_addr_t dma_handle;
+
        struct list_head node;          /* Node in the list of QHs */
        struct usb_host_endpoint *hep;  /* Endpoint information */
        struct usb_device *udev;
@@ -150,8 +152,6 @@ struct uhci_qh {
        int state;                      /* QH_STATE_xxx; see above */
        int type;                       /* Queue type (control, bulk, etc) */
 
-       dma_addr_t dma_handle;
-
        unsigned int initial_toggle:1;  /* Endpoint's current toggle value */
        unsigned int needs_fixup:1;     /* Must fix the TD toggle values */
        unsigned int is_stopped:1;      /* Queue was stopped by error/unlink */
@@ -171,6 +171,8 @@ static inline __le32 qh_element(struct uhci_qh *qh) {
        return element;
 }
 
+#define LINK_TO_QH(qh)         (UHCI_PTR_QH | cpu_to_le32((qh)->dma_handle))
+
 
 /*
  *     Transfer Descriptors
@@ -264,6 +266,8 @@ static inline u32 td_status(struct uhci_td *td) {
        return le32_to_cpu(status);
 }
 
+#define LINK_TO_TD(td)         (cpu_to_le32((td)->dma_handle))
+
 
 /*
  *     Skeleton Queue Headers

diff --git a/drivers/usb/host/uhci-q.c b/drivers/usb/host/uhci-q.c
index 68e66b3..a0c6bf6 100644 (file)
--- a/drivers/usb/host/uhci-q.c
+++ b/drivers/usb/host/uhci-q.c
@@ -46,8 +46,7 @@ static inline void uhci_clear_next_interrupt(struct uhci_hcd *uhci)
 static void uhci_fsbr_on(struct uhci_hcd *uhci)
 {
        uhci->fsbr_is_on = 1;
-       uhci->skel_term_qh->link = cpu_to_le32(
-                       uhci->skel_fs_control_qh->dma_handle) | UHCI_PTR_QH;
+       uhci->skel_term_qh->link = LINK_TO_QH(uhci->skel_fs_control_qh);
 }
 
 static void uhci_fsbr_off(struct uhci_hcd *uhci)
@@ -158,11 +157,11 @@ static inline void uhci_insert_td_in_frame_list(struct uhci_hcd *uhci,
 
                td->link = ltd->link;
                wmb();
-               ltd->link = cpu_to_le32(td->dma_handle);
+               ltd->link = LINK_TO_TD(td);
        } else {
                td->link = uhci->frame[framenum];
                wmb();
-               uhci->frame[framenum] = cpu_to_le32(td->dma_handle);
+               uhci->frame[framenum] = LINK_TO_TD(td);
                uhci->frame_cpu[framenum] = td;
        }
 }
@@ -184,7 +183,7 @@ static inline void uhci_remove_td_from_frame_list(struct uhci_hcd *uhci,
                        struct uhci_td *ntd;
 
                        ntd = list_entry(td->fl_list.next, struct uhci_td, fl_list);
-                       uhci->frame[td->frame] = cpu_to_le32(ntd->dma_handle);
+                       uhci->frame[td->frame] = LINK_TO_TD(ntd);
                        uhci->frame_cpu[td->frame] = ntd;
                }
        } else {
@@ -421,7 +420,7 @@ static void uhci_activate_qh(struct uhci_hcd *uhci, struct uhci_qh *qh)
                struct uhci_td *td = list_entry(urbp->td_list.next,
                                struct uhci_td, list);
 
-               qh->element = cpu_to_le32(td->dma_handle);
+               qh->element = LINK_TO_TD(td);
        }
 
        /* Treat the queue as if it has just advanced */
@@ -443,7 +442,7 @@ static void uhci_activate_qh(struct uhci_hcd *uhci, struct uhci_qh *qh)
        pqh = list_entry(qh->node.prev, struct uhci_qh, node);
        qh->link = pqh->link;
        wmb();
-       pqh->link = UHCI_PTR_QH | cpu_to_le32(qh->dma_handle);
+       pqh->link = LINK_TO_QH(qh);
 }
 
 /*
@@ -737,7 +736,7 @@ static int uhci_submit_control(struct uhci_hcd *uhci, struct urb *urb,
                td = uhci_alloc_td(uhci);
                if (!td)
                        goto nomem;
-               *plink = cpu_to_le32(td->dma_handle);
+               *plink = LINK_TO_TD(td);
 
                /* Alternate Data0/1 (start with Data1) */
                destination ^= TD_TOKEN_TOGGLE;
@@ -757,7 +756,7 @@ static int uhci_submit_control(struct uhci_hcd *uhci, struct urb *urb,
        td = uhci_alloc_td(uhci);
        if (!td)
                goto nomem;
-       *plink = cpu_to_le32(td->dma_handle);
+       *plink = LINK_TO_TD(td);
 
        /*
         * It's IN if the pipe is an output pipe or we're not expecting
@@ -784,7 +783,7 @@ static int uhci_submit_control(struct uhci_hcd *uhci, struct urb *urb,
        td = uhci_alloc_td(uhci);
        if (!td)
                goto nomem;
-       *plink = cpu_to_le32(td->dma_handle);
+       *plink = LINK_TO_TD(td);
 
        uhci_fill_td(td, 0, USB_PID_OUT | uhci_explen(0), 0);
        wmb();
@@ -860,7 +859,7 @@ static int uhci_submit_common(struct uhci_hcd *uhci, struct urb *urb,
                        td = uhci_alloc_td(uhci);
                        if (!td)
                                goto nomem;
-                       *plink = cpu_to_le32(td->dma_handle);
+                       *plink = LINK_TO_TD(td);
                }
                uhci_add_td_to_urbp(td, urbp);
                uhci_fill_td(td, status,
@@ -888,7 +887,7 @@ static int uhci_submit_common(struct uhci_hcd *uhci, struct urb *urb,
                td = uhci_alloc_td(uhci);
                if (!td)
                        goto nomem;
-               *plink = cpu_to_le32(td->dma_handle);
+               *plink = LINK_TO_TD(td);
 
                uhci_add_td_to_urbp(td, urbp);
                uhci_fill_td(td, status,
@@ -914,7 +913,7 @@ static int uhci_submit_common(struct uhci_hcd *uhci, struct urb *urb,
        td = uhci_alloc_td(uhci);
        if (!td)
                goto nomem;
-       *plink = cpu_to_le32(td->dma_handle);
+       *plink = LINK_TO_TD(td);
 
        uhci_fill_td(td, 0, USB_PID_OUT | uhci_explen(0), 0);
        wmb();
@@ -1005,7 +1004,7 @@ static int uhci_fixup_short_transfer(struct uhci_hcd *uhci,
                 * the queue at the status stage transaction, which is
                 * the last TD. */
                WARN_ON(list_empty(&urbp->td_list));
-               qh->element = cpu_to_le32(td->dma_handle);
+               qh->element = LINK_TO_TD(td);
                tmp = td->list.prev;
                ret = -EINPROGRESS;
 
@@ -1566,8 +1565,7 @@ static int uhci_advance_check(struct uhci_hcd *uhci, struct uhci_qh *qh)
        if (time_after(jiffies, qh->advance_jiffies + QH_WAIT_TIMEOUT)) {
 
                /* Detect the Intel bug and work around it */
-               if (qh->post_td && qh_element(qh) ==
-                               cpu_to_le32(qh->post_td->dma_handle)) {
+               if (qh->post_td && qh_element(qh) == LINK_TO_TD(qh->post_td)) {
                        qh->element = qh->post_td->link;
                        qh->advance_jiffies = jiffies;
                        ret = 1;