usb: gadget: atmel_usba: Cache INT_ENB register value

Cache INT_ENB register value in order to avoid uncached iomem access, and
thus improve access time to INT_ENB value.

Acked-by: Alexandre Belloni <alexandre.belloni@free-electrons.com>
Signed-off-by: Boris Brezillon <boris.brezillon@free-electrons.com>
Signed-off-by: Felipe Balbi <balbi@ti.com>

2 files changed, 30 insertions, 24 deletions

diff --git a/drivers/usb/gadget/udc/atmel_usba_udc.c b/drivers/usb/gadget/udc/atmel_usba_udc.c
index bc3a53264c43..6dfe17b583fb 100644
--- a/drivers/usb/gadget/udc/atmel_usba_udc.c
+++ b/drivers/usb/gadget/udc/atmel_usba_udc.c
@@ -316,6 +316,17 @@ static inline void usba_cleanup_debugfs(struct usba_udc *udc)
 }
 #endif
 
+static inline u32 usba_int_enb_get(struct usba_udc *udc)
+{
+        return udc->int_enb_cache;
+}
+
+static inline void usba_int_enb_set(struct usba_udc *udc, u32 val)
+{
+        usba_writel(udc, INT_ENB, val);
+        udc->int_enb_cache = val;
+}
+
 static int vbus_is_present(struct usba_udc *udc)
 {
         if (gpio_is_valid(udc->vbus_pin))
@@ -597,16 +608,14 @@ usba_ep_enable(struct usb_ep *_ep, const struct usb_endpoint_descriptor *desc)
         if (ep->can_dma) {
                 u32 ctrl;
 
-                usba_writel(udc, INT_ENB,
-                                (usba_readl(udc, INT_ENB)
-                                        | USBA_BF(EPT_INT, 1 << ep->index)
-                                        | USBA_BF(DMA_INT, 1 << ep->index)));
+                usba_int_enb_set(udc, usba_int_enb_get(udc) |
+                                      USBA_BF(EPT_INT, 1 << ep->index) |
+                                      USBA_BF(DMA_INT, 1 << ep->index));
                 ctrl = USBA_AUTO_VALID | USBA_INTDIS_DMA;
                 usba_ep_writel(ep, CTL_ENB, ctrl);
         } else {
-                usba_writel(udc, INT_ENB,
-                                (usba_readl(udc, INT_ENB)
-                                        | USBA_BF(EPT_INT, 1 << ep->index)));
+                usba_int_enb_set(udc, usba_int_enb_get(udc) |
+                                      USBA_BF(EPT_INT, 1 << ep->index));
         }
 
         spin_unlock_irqrestore(&udc->lock, flags);
@@ -614,7 +623,7 @@ usba_ep_enable(struct usb_ep *_ep, const struct usb_endpoint_descriptor *desc)
         DBG(DBG_HW, "EPT_CFG%d after init: %#08lx\n", ep->index,
                         (unsigned long)usba_ep_readl(ep, CFG));
         DBG(DBG_HW, "INT_ENB after init: %#08lx\n",
-                        (unsigned long)usba_readl(udc, INT_ENB));
+                        (unsigned long)usba_int_enb_get(udc));
 
         return 0;
 }
@@ -650,9 +659,8 @@ static int usba_ep_disable(struct usb_ep *_ep)
                 usba_dma_readl(ep, STATUS);
         }
         usba_ep_writel(ep, CTL_DIS, USBA_EPT_ENABLE);
-        usba_writel(udc, INT_ENB,
-                        usba_readl(udc, INT_ENB)
-                        & ~USBA_BF(EPT_INT, 1 << ep->index));
+        usba_int_enb_set(udc, usba_int_enb_get(udc) &
+                              ~USBA_BF(EPT_INT, 1 << ep->index));
 
         request_complete_list(ep, &req_list, -ESHUTDOWN);
 
@@ -1606,20 +1614,20 @@ static void usba_dma_irq(struct usba_udc *udc, struct usba_ep *ep)
 static irqreturn_t usba_udc_irq(int irq, void *devid)
 {
         struct usba_udc *udc = devid;
-        u32 status;
+        u32 status, int_enb;
         u32 dma_status;
         u32 ep_status;
 
         spin_lock(&udc->lock);
 
-        status = usba_readl(udc, INT_STA) & usba_readl(udc, INT_ENB);
+        int_enb = usba_int_enb_get(udc);
+        status = usba_readl(udc, INT_STA) & int_enb;
         DBG(DBG_INT, "irq, status=%#08x\n", status);
 
         if (status & USBA_DET_SUSPEND) {
                 toggle_bias(udc, 0);
                 usba_writel(udc, INT_CLR, USBA_DET_SUSPEND);
-                usba_writel(udc, INT_ENB,
-                            usba_readl(udc, INT_ENB) | USBA_WAKE_UP);
+                usba_int_enb_set(udc, int_enb | USBA_WAKE_UP);
                 udc->bias_pulse_needed = true;
                 DBG(DBG_BUS, "Suspend detected\n");
                 if (udc->gadget.speed != USB_SPEED_UNKNOWN
@@ -1633,8 +1641,7 @@ static irqreturn_t usba_udc_irq(int irq, void *devid)
         if (status & USBA_WAKE_UP) {
                 toggle_bias(udc, 1);
                 usba_writel(udc, INT_CLR, USBA_WAKE_UP);
-                usba_writel(udc, INT_ENB,
-                            usba_readl(udc, INT_ENB) & ~USBA_WAKE_UP);
+                usba_int_enb_set(udc, int_enb & ~USBA_WAKE_UP);
                 DBG(DBG_BUS, "Wake Up CPU detected\n");
         }
 
@@ -1702,11 +1709,8 @@ static irqreturn_t usba_udc_irq(int irq, void *devid)
                                 | USBA_BF(BK_NUMBER, USBA_BK_NUMBER_ONE)));
                 usba_ep_writel(ep0, CTL_ENB,
                                 USBA_EPT_ENABLE | USBA_RX_SETUP);
-                usba_writel(udc, INT_ENB,
-                                (usba_readl(udc, INT_ENB)
-                                | USBA_BF(EPT_INT, 1)
-                                | USBA_DET_SUSPEND
-                                | USBA_END_OF_RESUME));
+                usba_int_enb_set(udc, int_enb | USBA_BF(EPT_INT, 1) |
+                                      USBA_DET_SUSPEND | USBA_END_OF_RESUME);
 
                 /*
                  * Unclear why we hit this irregularly, e.g. in usbtest,
@@ -1741,7 +1745,7 @@ static irqreturn_t usba_vbus_irq(int irq, void *devid)
                 if (vbus) {
                         toggle_bias(udc, 1);
                         usba_writel(udc, CTRL, USBA_ENABLE_MASK);
-                        usba_writel(udc, INT_ENB, USBA_END_OF_RESET);
+                        usba_int_enb_set(udc, USBA_END_OF_RESET);
                 } else {
                         udc->gadget.speed = USB_SPEED_UNKNOWN;
                         reset_all_endpoints(udc);
@@ -1793,7 +1797,7 @@ static int atmel_usba_start(struct usb_gadget *gadget,
         if (vbus_is_present(udc) && udc->vbus_prev == 0) {
                 toggle_bias(udc, 1);
                 usba_writel(udc, CTRL, USBA_ENABLE_MASK);
-                usba_writel(udc, INT_ENB, USBA_END_OF_RESET);
+                usba_int_enb_set(udc, USBA_END_OF_RESET);
         }
         spin_unlock_irqrestore(&udc->lock, flags);
 
diff --git a/drivers/usb/gadget/udc/atmel_usba_udc.h b/drivers/usb/gadget/udc/atmel_usba_udc.h
index 72b3537f56ce..497cd18836f3 100644
--- a/drivers/usb/gadget/udc/atmel_usba_udc.h
+++ b/drivers/usb/gadget/udc/atmel_usba_udc.h
@@ -334,6 +334,8 @@ struct usba_udc {
         u16 test_mode;
         int vbus_prev;
 
+        u32 int_enb_cache;
+
 #ifdef CONFIG_USB_GADGET_DEBUG_FS
         struct dentry *debugfs_root;
         struct dentry *debugfs_regs;