usb/isp1760: Remove unneeded OR map and HcBufferStatus code

Since we always set the OR flag for each transfer, we can just as well set all
these bits to 1 at init and be done with it. Also, HcBufferStatus can be set
at init as per the ISP1761 datasheet page 47 with no loss of performance.

Signed-off-by: Arvid Brodin <arvid.brodin@enea.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

1 files changed, 8 insertions, 55 deletions

diff --git a/drivers/usb/host/isp1760-hcd.c b/drivers/usb/host/isp1760-hcd.c
index 6b2bf4684f45..a5f03cdf9ba5 100644
--- a/drivers/usb/host/isp1760-hcd.c
+++ b/drivers/usb/host/isp1760-hcd.c
@@ -336,10 +336,6 @@ static void isp1760_init_regs(struct usb_hcd *hcd)
         reg_write32(hcd->regs, HC_ATL_PTD_SKIPMAP_REG, NO_TRANSFER_ACTIVE);
         reg_write32(hcd->regs, HC_INT_PTD_SKIPMAP_REG, NO_TRANSFER_ACTIVE);
         reg_write32(hcd->regs, HC_ISO_PTD_SKIPMAP_REG, NO_TRANSFER_ACTIVE);
-
-        reg_write32(hcd->regs, HC_ATL_PTD_DONEMAP_REG, ~NO_TRANSFER_ACTIVE);
-        reg_write32(hcd->regs, HC_INT_PTD_DONEMAP_REG, ~NO_TRANSFER_ACTIVE);
-        reg_write32(hcd->regs, HC_ISO_PTD_DONEMAP_REG, ~NO_TRANSFER_ACTIVE);
 }
 
 static int handshake(struct usb_hcd *hcd, u32 reg,
@@ -516,14 +512,17 @@ static void isp1760_init_maps(struct usb_hcd *hcd)
         reg_write32(hcd->regs, HC_ATL_PTD_LASTPTD_REG, 0x80000000);
         reg_write32(hcd->regs, HC_INT_PTD_LASTPTD_REG, 0x80000000);
         reg_write32(hcd->regs, HC_ISO_PTD_LASTPTD_REG, 0x00000001);
+
+        reg_write32(hcd->regs, HC_BUFFER_STATUS_REG,
+                                                ATL_BUF_FILL | INT_BUF_FILL);
 }
 
 static void isp1760_enable_interrupts(struct usb_hcd *hcd)
 {
         reg_write32(hcd->regs, HC_ATL_IRQ_MASK_AND_REG, 0);
-        reg_write32(hcd->regs, HC_ATL_IRQ_MASK_OR_REG, 0);
+        reg_write32(hcd->regs, HC_ATL_IRQ_MASK_OR_REG, 0xffffffff);
         reg_write32(hcd->regs, HC_INT_IRQ_MASK_AND_REG, 0);
-        reg_write32(hcd->regs, HC_INT_IRQ_MASK_OR_REG, 0);
+        reg_write32(hcd->regs, HC_INT_IRQ_MASK_OR_REG, 0xffffffff);
         reg_write32(hcd->regs, HC_ISO_IRQ_MASK_AND_REG, 0);
         reg_write32(hcd->regs, HC_ISO_IRQ_MASK_OR_REG, 0xffffffff);
         /* step 23 passed */
@@ -835,9 +834,8 @@ static void enqueue_an_ATL_packet(struct usb_hcd *hcd, struct isp1760_qh *qh,
                                   struct isp1760_qtd *qtd)
 {
         struct isp1760_hcd *priv = hcd_to_priv(hcd);
-        u32 skip_map, or_map;
+        u32 skip_map;
         u32 slot;
-        u32 buffstatus;
 
         /*
          * When this function is called from the interrupt handler to enqueue
@@ -854,10 +852,6 @@ static void enqueue_an_ATL_packet(struct usb_hcd *hcd, struct isp1760_qh *qh,
 
         enqueue_one_atl_qtd(hcd, qh, slot, qtd);
 
-        or_map = reg_read32(hcd->regs, HC_ATL_IRQ_MASK_OR_REG);
-        or_map |= (1 << slot);
-        reg_write32(hcd->regs, HC_ATL_IRQ_MASK_OR_REG, or_map);
-
         skip_map &= ~(1 << slot);
         reg_write32(hcd->regs, HC_ATL_PTD_SKIPMAP_REG, skip_map);
 
@@ -865,18 +859,13 @@ static void enqueue_an_ATL_packet(struct usb_hcd *hcd, struct isp1760_qh *qh,
         if (priv->atl_queued == 2)
                 reg_write32(hcd->regs, HC_INTERRUPT_ENABLE,
                                 INTERRUPT_ENABLE_SOT_MASK);
-
-        buffstatus = reg_read32(hcd->regs, HC_BUFFER_STATUS_REG);
-        buffstatus |= ATL_BUFFER;
-        reg_write32(hcd->regs, HC_BUFFER_STATUS_REG, buffstatus);
 }
 
 static void enqueue_an_INT_packet(struct usb_hcd *hcd, struct isp1760_qh *qh,
                                   struct isp1760_qtd *qtd)
 {
-        u32 skip_map, or_map;
+        u32 skip_map;
         u32 slot;
-        u32 buffstatus;
 
         /*
          * When this function is called from the interrupt handler to enqueue
@@ -893,16 +882,8 @@ static void enqueue_an_INT_packet(struct usb_hcd *hcd, struct isp1760_qh *qh,
 
         enqueue_one_int_qtd(hcd, qh, slot, qtd);
 
-        or_map = reg_read32(hcd->regs, HC_INT_IRQ_MASK_OR_REG);
-        or_map |= (1 << slot);
-        reg_write32(hcd->regs, HC_INT_IRQ_MASK_OR_REG, or_map);
-
         skip_map &= ~(1 << slot);
         reg_write32(hcd->regs, HC_INT_PTD_SKIPMAP_REG, skip_map);
-
-        buffstatus = reg_read32(hcd->regs, HC_BUFFER_STATUS_REG);
-        buffstatus |= INT_BUFFER;
-        reg_write32(hcd->regs, HC_BUFFER_STATUS_REG, buffstatus);
 }
 
 static void isp1760_urb_done(struct usb_hcd *hcd, struct urb *urb)
@@ -994,7 +975,6 @@ static void do_atl_int(struct usb_hcd *hcd)
         struct urb *urb;
         u32 slot;
         u32 length;
-        u32 or_map;
         u32 status = -EINVAL;
         int error;
         struct isp1760_qtd *qtd;
@@ -1005,10 +985,6 @@ static void do_atl_int(struct usb_hcd *hcd)
         done_map = reg_read32(hcd->regs, HC_ATL_PTD_DONEMAP_REG);
         skip_map = reg_read32(hcd->regs, HC_ATL_PTD_SKIPMAP_REG);
 
-        or_map = reg_read32(hcd->regs, HC_ATL_IRQ_MASK_OR_REG);
-        or_map &= ~done_map;
-        reg_write32(hcd->regs, HC_ATL_IRQ_MASK_OR_REG, or_map);
-
         while (done_map) {
                 status = 0;
                 priv->atl_queued--;
@@ -1048,8 +1024,6 @@ static void do_atl_int(struct usb_hcd *hcd)
                 }
 
                 if (!nakcount && (ptd.dw3 & DW3_QTD_ACTIVE)) {
-                        u32 buffstatus;
-
                         /*
                          * NAKs are handled in HW by the chip. Usually if the
                          * device is not able to send data fast enough.
@@ -1068,9 +1042,6 @@ static void do_atl_int(struct usb_hcd *hcd)
                          * unskipped once it gets written to the HW.
                          */
                         skip_map &= ~(1 << slot);
-                        or_map = reg_read32(hcd->regs, HC_ATL_IRQ_MASK_OR_REG);
-                        or_map |= 1 << slot;
-                        reg_write32(hcd->regs, HC_ATL_IRQ_MASK_OR_REG, or_map);
 
                         ptd.dw0 |= PTD_VALID;
                         ptd_write(hcd->regs, ATL_PTD_OFFSET, slot, &ptd);
@@ -1079,12 +1050,6 @@ static void do_atl_int(struct usb_hcd *hcd)
                         if (priv->atl_queued == 2)
                                 reg_write32(hcd->regs, HC_INTERRUPT_ENABLE,
                                                 INTERRUPT_ENABLE_SOT_MASK);
-
-                        buffstatus = reg_read32(hcd->regs,
-                                                        HC_BUFFER_STATUS_REG);
-                        buffstatus |= ATL_BUFFER;
-                        reg_write32(hcd->regs, HC_BUFFER_STATUS_REG,
-                                                                buffstatus);
                         continue;
                 }
 
@@ -1191,7 +1156,6 @@ static void do_intl_int(struct usb_hcd *hcd)
         struct ptd ptd;
         struct urb *urb;
         u32 length;
-        u32 or_map;
         int error;
         u32 slot;
         struct isp1760_qtd *qtd;
@@ -1200,10 +1164,6 @@ static void do_intl_int(struct usb_hcd *hcd)
         done_map = reg_read32(hcd->regs, HC_INT_PTD_DONEMAP_REG);
         skip_map = reg_read32(hcd->regs, HC_INT_PTD_SKIPMAP_REG);
 
-        or_map = reg_read32(hcd->regs, HC_INT_IRQ_MASK_OR_REG);
-        or_map &= ~done_map;
-        reg_write32(hcd->regs, HC_INT_IRQ_MASK_OR_REG, or_map);
-
         while (done_map) {
                 slot = __ffs(done_map);
                 done_map &= ~(1 << slot);
@@ -1503,7 +1463,7 @@ static int isp1760_urb_dequeue(struct usb_hcd *hcd, struct urb *urb, int status)
         struct isp1760_hcd *priv = hcd_to_priv(hcd);
         struct inter_packet_info *ints;
         u32 i;
-        u32 reg_base, or_reg, skip_reg;
+        u32 reg_base, skip_reg;
         unsigned long flags;
         struct ptd ptd;
         packet_enqueue *pe;
@@ -1516,7 +1476,6 @@ static int isp1760_urb_dequeue(struct usb_hcd *hcd, struct urb *urb, int status)
         case PIPE_INTERRUPT:
                 ints = priv->int_ints;
                 reg_base = INT_PTD_OFFSET;
-                or_reg = HC_INT_IRQ_MASK_OR_REG;
                 skip_reg = HC_INT_PTD_SKIPMAP_REG;
                 pe = enqueue_an_INT_packet;
                 break;
@@ -1524,7 +1483,6 @@ static int isp1760_urb_dequeue(struct usb_hcd *hcd, struct urb *urb, int status)
         default:
                 ints = priv->atl_ints;
                 reg_base = ATL_PTD_OFFSET;
-                or_reg = HC_ATL_IRQ_MASK_OR_REG;
                 skip_reg = HC_ATL_PTD_SKIPMAP_REG;
                 pe =  enqueue_an_ATL_packet;
                 break;
@@ -1540,7 +1498,6 @@ static int isp1760_urb_dequeue(struct usb_hcd *hcd, struct urb *urb, int status)
 
                 if (ints[i].qtd->urb == urb) {
                         u32 skip_map;
-                        u32 or_map;
                         struct isp1760_qtd *qtd;
                         struct isp1760_qh *qh;
 
@@ -1548,10 +1505,6 @@ static int isp1760_urb_dequeue(struct usb_hcd *hcd, struct urb *urb, int status)
                         skip_map |= 1 << i;
                         reg_write32(hcd->regs, skip_reg, skip_map);
 
-                        or_map = reg_read32(hcd->regs, or_reg);
-                        or_map &= ~(1 << i);
-                        reg_write32(hcd->regs, or_reg, or_map);
-
                         ptd_write(hcd->regs, reg_base, i, &ptd);
 
                         qtd = ints[i].qtd;