2 files changed, 40 insertions, 2 deletions

diff --git a/arch/arm/plat-samsung/include/plat/regs-usb-hsotg.h b/arch/arm/plat-samsung/include/plat/regs-usb-hsotg.h
index 8d18d9d4d148..dc90f5ede88f 100644
--- a/arch/arm/plat-samsung/include/plat/regs-usb-hsotg.h
+++ b/arch/arm/plat-samsung/include/plat/regs-usb-hsotg.h
@@ -226,6 +226,7 @@
 
 #define S3C_DIEPMSK                             S3C_HSOTG_REG(0x810)
 
+#define S3C_DIEPMSK_TxFIFOEmpty                 (1 << 7)
 #define S3C_DIEPMSK_INEPNakEffMsk               (1 << 6)
 #define S3C_DIEPMSK_INTknEPMisMsk               (1 << 5)
 #define S3C_DIEPMSK_INTknTXFEmpMsk              (1 << 4)
@@ -371,6 +372,7 @@
 
 #define S3C_DIEPDMA(_a)                         S3C_HSOTG_REG(0x914 + ((_a) * 0x20))
 #define S3C_DOEPDMA(_a)                         S3C_HSOTG_REG(0xB14 + ((_a) * 0x20))
+#define S3C_DTXFSTS(_a)                         S3C_HSOTG_REG(0x918 + ((_a) * 0x20))
 
 #define S3C_EPFIFO(_a)                          S3C_HSOTG_REG(0x1000 + ((_a) * 0x1000))
 
diff --git a/drivers/usb/gadget/s3c-hsotg.c b/drivers/usb/gadget/s3c-hsotg.c
index 9d32c9ff737d..4196e376a346 100644
--- a/drivers/usb/gadget/s3c-hsotg.c
+++ b/drivers/usb/gadget/s3c-hsotg.c
@@ -12,6 +12,8 @@
  * published by the Free Software Foundation.
 */
 
+#define DEBUG
+
 #include <linux/kernel.h>
 #include <linux/module.h>
 #include <linux/spinlock.h>
@@ -130,6 +132,7 @@ struct s3c_hsotg_ep {
  * @regs: The memory area mapped for accessing registers.
  * @regs_res: The resource that was allocated when claiming register space.
  * @irq: The IRQ number we are using
+ * @dedicated_fifos: Set if the hardware has dedicated IN-EP fifos.
  * @debug_root: root directrory for debugfs.
  * @debug_file: main status file for debugfs.
  * @debug_fifo: FIFO status file for debugfs.
@@ -148,6 +151,8 @@ struct s3c_hsotg {
         struct resource         *regs_res;
         int                     irq;
 
+        unsigned int            dedicated_fifos:1;
+
         struct dentry           *debug_root;
         struct dentry           *debug_file;
         struct dentry           *debug_fifo;
@@ -466,7 +471,7 @@ static int s3c_hsotg_write_fifo(struct s3c_hsotg *hsotg,
         if (to_write == 0)
                 return 0;
 
-        if (periodic) {
+        if (periodic && !hsotg->dedicated_fifos) {
                 u32 epsize = readl(hsotg->regs + S3C_DIEPTSIZ(hs_ep->index));
                 int size_left;
                 int size_done;
@@ -504,6 +509,11 @@ static int s3c_hsotg_write_fifo(struct s3c_hsotg *hsotg,
                         s3c_hsotg_en_gsint(hsotg, S3C_GINTSTS_PTxFEmp);
                         return -ENOSPC;
                 }
+        } else if (hsotg->dedicated_fifos && hs_ep->index != 0) {
+                can_write = readl(hsotg->regs + S3C_DTXFSTS(hs_ep->index));
+
+                can_write &= 0xffff;
+                can_write *= 4;
         } else {
                 if (S3C_GNPTXSTS_NPTxQSpcAvail_GET(gnptxsts) == 0) {
                         dev_dbg(hsotg->dev,
@@ -1829,6 +1839,15 @@ static void s3c_hsotg_epint(struct s3c_hsotg *hsotg, unsigned int idx,
                                  __func__, idx);
                         clear |= S3C_DIEPMSK_INTknEPMisMsk;
                 }
+
+                /* FIFO has space or is empty (see GAHBCFG) */
+                if (hsotg->dedicated_fifos &&
+                    ints & S3C_DIEPMSK_TxFIFOEmpty) {
+                        dev_dbg(hsotg->dev, "%s: ep%d: TxFIFOEmpty\n",
+                                __func__, idx);
+                        s3c_hsotg_trytx(hsotg, hs_ep);
+                        clear |= S3C_DIEPMSK_TxFIFOEmpty;
+                }
         }
 
         writel(clear, hsotg->regs + epint_reg);
@@ -2280,6 +2299,12 @@ static int s3c_hsotg_ep_enable(struct usb_ep *ep,
                 break;
         }
 
+        /* if the hardware has dedicated fifos, we must give each IN EP
+         * a unique tx-fifo even if it is non-periodic.
+         */
+        if (dir_in && hsotg->dedicated_fifos)
+                epctrl |= S3C_DxEPCTL_TxFNum(index);
+
         /* for non control endpoints, set PID to D0 */
         if (index)
                 epctrl |= S3C_DxEPCTL_SetD0PID;
@@ -2569,7 +2594,8 @@ int usb_gadget_register_driver(struct usb_gadget_driver *driver)
 
         writel(S3C_DIEPMSK_TimeOUTMsk | S3C_DIEPMSK_AHBErrMsk |
                S3C_DIEPMSK_INTknEPMisMsk |
-               S3C_DIEPMSK_EPDisbldMsk | S3C_DIEPMSK_XferComplMsk,
+               S3C_DIEPMSK_EPDisbldMsk | S3C_DIEPMSK_XferComplMsk |
+               ((hsotg->dedicated_fifos) ? S3C_DIEPMSK_TxFIFOEmpty : 0),
                hsotg->regs + S3C_DIEPMSK);
 
         /* don't need XferCompl, we get that from RXFIFO in slave mode. In
@@ -2778,6 +2804,8 @@ static void s3c_hsotg_otgreset(struct s3c_hsotg *hsotg)
 
 static void s3c_hsotg_init(struct s3c_hsotg *hsotg)
 {
+        u32 cfg4;
+
         /* unmask subset of endpoint interrupts */
 
         writel(S3C_DIEPMSK_TimeOUTMsk | S3C_DIEPMSK_AHBErrMsk |
@@ -2813,6 +2841,14 @@ static void s3c_hsotg_init(struct s3c_hsotg *hsotg)
 
         writel(using_dma(hsotg) ? S3C_GAHBCFG_DMAEn : 0x0,
                hsotg->regs + S3C_GAHBCFG);
+
+        /* check hardware configuration */
+
+        cfg4 = readl(hsotg->regs + 0x50);
+        hsotg->dedicated_fifos = (cfg4 >> 25) & 1;
+
+        dev_info(hsotg->dev, "%s fifos\n",
+                 hsotg->dedicated_fifos ? "dedicated" : "shared");
 }
 
 static void s3c_hsotg_dump(struct s3c_hsotg *hsotg)