USB: Implement support for EHCI with big endian MMIO

This patch implements supports for EHCI controllers whose MMIO
registers are big endian and enables that functionality for
the Toshiba SCC chip. It does _not_ add support for big endian
in-memory data structures as this is not needed for that chip
and I hope it will never be.

The guts of the patch are to convert readl(...) to
ehci_readl(ehci, ...) and similarly for register writes.

Signed-off-by: Kou Ishizaki <kou.ishizaki@toshiba.co.jp>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Acked-by: Geoff Levand <geoffrey.levand@am.sony.com>
Acked-by: David Brownell <dbrownell@users.sourceforge.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

9 files changed, 213 insertions, 142 deletions

diff --git a/drivers/usb/host/Kconfig b/drivers/usb/host/Kconfig
index faabce8bf39f..832599852106 100644
--- a/drivers/usb/host/Kconfig
+++ b/drivers/usb/host/Kconfig
@@ -67,6 +67,11 @@ config USB_EHCI_TT_NEWSCHED
 
           If unsure, say N.
 
+config USB_EHCI_BIG_ENDIAN_MMIO
+        bool
+        depends on USB_EHCI_HCD
+        default n
+
 config USB_ISP116X_HCD
         tristate "ISP116X HCD support"
         depends on USB
diff --git a/drivers/usb/host/ehci-dbg.c b/drivers/usb/host/ehci-dbg.c
index 56349d21e6ea..246afea9e83b 100644
--- a/drivers/usb/host/ehci-dbg.c
+++ b/drivers/usb/host/ehci-dbg.c
@@ -43,7 +43,7 @@
  */
 static void dbg_hcs_params (struct ehci_hcd *ehci, char *label)
 {
-        u32     params = readl (&ehci->caps->hcs_params);
+        u32     params = ehci_readl(ehci, &ehci->caps->hcs_params);
 
         ehci_dbg (ehci,
                 "%s hcs_params 0x%x dbg=%d%s cc=%d pcc=%d%s%s ports=%d\n",
@@ -87,7 +87,7 @@ static inline void dbg_hcs_params (struct ehci_hcd *ehci, char *label) {}
  * */
 static void dbg_hcc_params (struct ehci_hcd *ehci, char *label)
 {
-        u32     params = readl (&ehci->caps->hcc_params);
+        u32     params = ehci_readl(ehci, &ehci->caps->hcc_params);
 
         if (HCC_ISOC_CACHE (params)) {
                 ehci_dbg (ehci,
@@ -653,7 +653,7 @@ show_registers (struct class_device *class_dev, char *buf)
         }
 
         /* Capability Registers */
-        i = HC_VERSION(readl (&ehci->caps->hc_capbase));
+        i = HC_VERSION(ehci_readl(ehci, &ehci->caps->hc_capbase));
         temp = scnprintf (next, size,
                 "bus %s, device %s (driver " DRIVER_VERSION ")\n"
                 "%s\n"
@@ -673,7 +673,7 @@ show_registers (struct class_device *class_dev, char *buf)
                 unsigned        count = 256/4;
 
                 pdev = to_pci_dev(ehci_to_hcd(ehci)->self.controller);
-                offset = HCC_EXT_CAPS (readl (&ehci->caps->hcc_params));
+                offset = HCC_EXT_CAPS (ehci_readl(ehci, &ehci->caps->hcc_params));
                 while (offset && count--) {
                         pci_read_config_dword (pdev, offset, &cap);
                         switch (cap & 0xff) {
@@ -704,50 +704,50 @@ show_registers (struct class_device *class_dev, char *buf)
 #endif
 
         // FIXME interpret both types of params
-        i = readl (&ehci->caps->hcs_params);
+        i = ehci_readl(ehci, &ehci->caps->hcs_params);
         temp = scnprintf (next, size, "structural params 0x%08x\n", i);
         size -= temp;
         next += temp;
 
-        i = readl (&ehci->caps->hcc_params);
+        i = ehci_readl(ehci, &ehci->caps->hcc_params);
         temp = scnprintf (next, size, "capability params 0x%08x\n", i);
         size -= temp;
         next += temp;
 
         /* Operational Registers */
         temp = dbg_status_buf (scratch, sizeof scratch, label,
-                        readl (&ehci->regs->status));
+                        ehci_readl(ehci, &ehci->regs->status));
         temp = scnprintf (next, size, fmt, temp, scratch);
         size -= temp;
         next += temp;
 
         temp = dbg_command_buf (scratch, sizeof scratch, label,
-                        readl (&ehci->regs->command));
+                        ehci_readl(ehci, &ehci->regs->command));
         temp = scnprintf (next, size, fmt, temp, scratch);
         size -= temp;
         next += temp;
 
         temp = dbg_intr_buf (scratch, sizeof scratch, label,
-                        readl (&ehci->regs->intr_enable));
+                        ehci_readl(ehci, &ehci->regs->intr_enable));
         temp = scnprintf (next, size, fmt, temp, scratch);
         size -= temp;
         next += temp;
 
         temp = scnprintf (next, size, "uframe %04x\n",
-                        readl (&ehci->regs->frame_index));
+                        ehci_readl(ehci, &ehci->regs->frame_index));
         size -= temp;
         next += temp;
 
         for (i = 1; i <= HCS_N_PORTS (ehci->hcs_params); i++) {
                 temp = dbg_port_buf (scratch, sizeof scratch, label, i,
-                                readl (&ehci->regs->port_status [i - 1]));
+                                ehci_readl(ehci, &ehci->regs->port_status [i - 1]));
                 temp = scnprintf (next, size, fmt, temp, scratch);
                 size -= temp;
                 next += temp;
                 if (i == HCS_DEBUG_PORT(ehci->hcs_params) && ehci->debug) {
                         temp = scnprintf (next, size,
                                         "    debug control %08x\n",
-                                        readl (&ehci->debug->control));
+                                        ehci_readl(ehci, &ehci->debug->control));
                         size -= temp;
                         next += temp;
                 }
diff --git a/drivers/usb/host/ehci-fsl.c b/drivers/usb/host/ehci-fsl.c
index 1a915e982c1c..a52480505f78 100644
--- a/drivers/usb/host/ehci-fsl.c
+++ b/drivers/usb/host/ehci-fsl.c
@@ -177,7 +177,7 @@ static void mpc83xx_setup_phy(struct ehci_hcd *ehci,
         case FSL_USB2_PHY_NONE:
                 break;
         }
-        writel(portsc, &ehci->regs->port_status[port_offset]);
+        ehci_writel(ehci, portsc, &ehci->regs->port_status[port_offset]);
 }
 
 static void mpc83xx_usb_setup(struct usb_hcd *hcd)
@@ -214,7 +214,7 @@ static void mpc83xx_usb_setup(struct usb_hcd *hcd)
         }
 
         /* put controller in host mode. */
-        writel(0x00000003, non_ehci + FSL_SOC_USB_USBMODE);
+        ehci_writel(ehci, 0x00000003, non_ehci + FSL_SOC_USB_USBMODE);
         out_be32(non_ehci + FSL_SOC_USB_PRICTRL, 0x0000000c);
         out_be32(non_ehci + FSL_SOC_USB_AGECNTTHRSH, 0x00000040);
         out_be32(non_ehci + FSL_SOC_USB_SICTRL, 0x00000001);
@@ -238,12 +238,12 @@ static int ehci_fsl_setup(struct usb_hcd *hcd)
         /* EHCI registers start at offset 0x100 */
         ehci->caps = hcd->regs + 0x100;
         ehci->regs = hcd->regs + 0x100 +
-            HC_LENGTH(readl(&ehci->caps->hc_capbase));
+            HC_LENGTH(ehci_readl(ehci, &ehci->caps->hc_capbase));
         dbg_hcs_params(ehci, "reset");
         dbg_hcc_params(ehci, "reset");
 
         /* cache this readonly data; minimize chip reads */
-        ehci->hcs_params = readl(&ehci->caps->hcs_params);
+        ehci->hcs_params = ehci_readl(ehci, &ehci->caps->hcs_params);
 
         retval = ehci_halt(ehci);
         if (retval)
diff --git a/drivers/usb/host/ehci-hcd.c b/drivers/usb/host/ehci-hcd.c
index 025d33313681..03d567e4d00a 100644
--- a/drivers/usb/host/ehci-hcd.c
+++ b/drivers/usb/host/ehci-hcd.c
@@ -157,12 +157,13 @@ MODULE_PARM_DESC (ignore_oc, "ignore bogus hardware overcurrent indications");
  * before driver shutdown. But it also seems to be caused by bugs in cardbus
  * bridge shutdown:  shutting down the bridge before the devices using it.
  */
-static int handshake (void __iomem *ptr, u32 mask, u32 done, int usec)
+static int handshake (struct ehci_hcd *ehci, void __iomem *ptr,
+                      u32 mask, u32 done, int usec)
 {
         u32     result;
 
         do {
-                result = readl (ptr);
+                result = ehci_readl(ehci, ptr);
                 if (result == ~(u32)0)          /* card removed */
                         return -ENODEV;
                 result &= mask;
@@ -177,18 +178,19 @@ static int handshake (void __iomem *ptr, u32 mask, u32 done, int usec)
 /* force HC to halt state from unknown (EHCI spec section 2.3) */
 static int ehci_halt (struct ehci_hcd *ehci)
 {
-        u32     temp = readl (&ehci->regs->status);
+        u32     temp = ehci_readl(ehci, &ehci->regs->status);
 
         /* disable any irqs left enabled by previous code */
-        writel (0, &ehci->regs->intr_enable);
+        ehci_writel(ehci, 0, &ehci->regs->intr_enable);
 
         if ((temp & STS_HALT) != 0)
                 return 0;
 
-        temp = readl (&ehci->regs->command);
+        temp = ehci_readl(ehci, &ehci->regs->command);
         temp &= ~CMD_RUN;
-        writel (temp, &ehci->regs->command);
-        return handshake (&ehci->regs->status, STS_HALT, STS_HALT, 16 * 125);
+        ehci_writel(ehci, temp, &ehci->regs->command);
+        return handshake (ehci, &ehci->regs->status,
+                          STS_HALT, STS_HALT, 16 * 125);
 }
 
 /* put TDI/ARC silicon into EHCI mode */
@@ -198,23 +200,24 @@ static void tdi_reset (struct ehci_hcd *ehci)
         u32             tmp;
 
         reg_ptr = (u32 __iomem *)(((u8 __iomem *)ehci->regs) + 0x68);
-        tmp = readl (reg_ptr);
+        tmp = ehci_readl(ehci, reg_ptr);
         tmp |= 0x3;
-        writel (tmp, reg_ptr);
+        ehci_writel(ehci, tmp, reg_ptr);
 }
 
 /* reset a non-running (STS_HALT == 1) controller */
 static int ehci_reset (struct ehci_hcd *ehci)
 {
         int     retval;
-        u32     command = readl (&ehci->regs->command);
+        u32     command = ehci_readl(ehci, &ehci->regs->command);
 
         command |= CMD_RESET;
         dbg_cmd (ehci, "reset", command);
-        writel (command, &ehci->regs->command);
+        ehci_writel(ehci, command, &ehci->regs->command);
         ehci_to_hcd(ehci)->state = HC_STATE_HALT;
         ehci->next_statechange = jiffies;
-        retval = handshake (&ehci->regs->command, CMD_RESET, 0, 250 * 1000);
+        retval = handshake (ehci, &ehci->regs->command,
+                            CMD_RESET, 0, 250 * 1000);
 
         if (retval)
                 return retval;
@@ -236,21 +239,21 @@ static void ehci_quiesce (struct ehci_hcd *ehci)
 #endif
 
         /* wait for any schedule enables/disables to take effect */
-        temp = readl (&ehci->regs->command) << 10;
+        temp = ehci_readl(ehci, &ehci->regs->command) << 10;
         temp &= STS_ASS | STS_PSS;
-        if (handshake (&ehci->regs->status, STS_ASS | STS_PSS,
+        if (handshake (ehci, &ehci->regs->status, STS_ASS | STS_PSS,
                                 temp, 16 * 125) != 0) {
                 ehci_to_hcd(ehci)->state = HC_STATE_HALT;
                 return;
         }
 
         /* then disable anything that's still active */
-        temp = readl (&ehci->regs->command);
+        temp = ehci_readl(ehci, &ehci->regs->command);
         temp &= ~(CMD_ASE | CMD_IAAD | CMD_PSE);
-        writel (temp, &ehci->regs->command);
+        ehci_writel(ehci, temp, &ehci->regs->command);
 
         /* hardware can take 16 microframes to turn off ... */
-        if (handshake (&ehci->regs->status, STS_ASS | STS_PSS,
+        if (handshake (ehci, &ehci->regs->status, STS_ASS | STS_PSS,
                                 0, 16 * 125) != 0) {
                 ehci_to_hcd(ehci)->state = HC_STATE_HALT;
                 return;
@@ -277,11 +280,11 @@ static void ehci_watchdog (unsigned long param)
 
         /* lost IAA irqs wedge things badly; seen with a vt8235 */
         if (ehci->reclaim) {
-                u32             status = readl (&ehci->regs->status);
+                u32             status = ehci_readl(ehci, &ehci->regs->status);
                 if (status & STS_IAA) {
                         ehci_vdbg (ehci, "lost IAA\n");
                         COUNT (ehci->stats.lost_iaa);
-                        writel (STS_IAA, &ehci->regs->status);
+                        ehci_writel(ehci, STS_IAA, &ehci->regs->status);
                         ehci->reclaim_ready = 1;
                 }
         }
@@ -309,7 +312,7 @@ ehci_shutdown (struct usb_hcd *hcd)
         (void) ehci_halt (ehci);
 
         /* make BIOS/etc use companion controller during reboot */
-        writel (0, &ehci->regs->configured_flag);
+        ehci_writel(ehci, 0, &ehci->regs->configured_flag);
 }
 
 static void ehci_port_power (struct ehci_hcd *ehci, int is_on)
@@ -379,11 +382,11 @@ static void ehci_stop (struct usb_hcd *hcd)
                 ehci_quiesce (ehci);
 
         ehci_reset (ehci);
-        writel (0, &ehci->regs->intr_enable);
+        ehci_writel(ehci, 0, &ehci->regs->intr_enable);
         spin_unlock_irq(&ehci->lock);
 
         /* let companion controllers work when we aren't */
-        writel (0, &ehci->regs->configured_flag);
+        ehci_writel(ehci, 0, &ehci->regs->configured_flag);
 
         remove_debug_files (ehci);
 
@@ -402,7 +405,8 @@ static void ehci_stop (struct usb_hcd *hcd)
                 ehci->stats.complete, ehci->stats.unlink);
 #endif
 
-        dbg_status (ehci, "ehci_stop completed", readl (&ehci->regs->status));
+        dbg_status (ehci, "ehci_stop completed",
+                    ehci_readl(ehci, &ehci->regs->status));
 }
 
 /* one-time init, only for memory state */
@@ -428,7 +432,7 @@ static int ehci_init(struct usb_hcd *hcd)
                 return retval;
 
         /* controllers may cache some of the periodic schedule ... */
-        hcc_params = readl(&ehci->caps->hcc_params);
+        hcc_params = ehci_readl(ehci, &ehci->caps->hcc_params);
         if (HCC_ISOC_CACHE(hcc_params))         // full frame cache
                 ehci->i_thresh = 8;
         else                                    // N microframes cached
@@ -501,8 +505,8 @@ static int ehci_run (struct usb_hcd *hcd)
                 ehci_mem_cleanup(ehci);
                 return retval;
         }
-        writel(ehci->periodic_dma, &ehci->regs->frame_list);
-        writel((u32)ehci->async->qh_dma, &ehci->regs->async_next);
+        ehci_writel(ehci, ehci->periodic_dma, &ehci->regs->frame_list);
+        ehci_writel(ehci, (u32)ehci->async->qh_dma, &ehci->regs->async_next);
 
         /*
          * hcc_params controls whether ehci->regs->segment must (!!!)
@@ -516,9 +520,9 @@ static int ehci_run (struct usb_hcd *hcd)
          * Scsi_Host.highmem_io, and so forth.  It's readonly to all
          * host side drivers though.
          */
-        hcc_params = readl(&ehci->caps->hcc_params);
+        hcc_params = ehci_readl(ehci, &ehci->caps->hcc_params);
         if (HCC_64BIT_ADDR(hcc_params)) {
-                writel(0, &ehci->regs->segment);
+                ehci_writel(ehci, 0, &ehci->regs->segment);
 #if 0
 // this is deeply broken on almost all architectures
                 if (!dma_set_mask(hcd->self.controller, DMA_64BIT_MASK))
@@ -531,7 +535,7 @@ static int ehci_run (struct usb_hcd *hcd)
         // root hub will detect new devices (why?); NEC doesn't
         ehci->command &= ~(CMD_LRESET|CMD_IAAD|CMD_PSE|CMD_ASE|CMD_RESET);
         ehci->command |= CMD_RUN;
-        writel (ehci->command, &ehci->regs->command);
+        ehci_writel(ehci, ehci->command, &ehci->regs->command);
         dbg_cmd (ehci, "init", ehci->command);
 
         /*
@@ -541,17 +545,18 @@ static int ehci_run (struct usb_hcd *hcd)
          * and there's no companion controller unless maybe for USB OTG.)
          */
         hcd->state = HC_STATE_RUNNING;
-        writel (FLAG_CF, &ehci->regs->configured_flag);
-        readl (&ehci->regs->command);   /* unblock posted writes */
+        ehci_writel(ehci, FLAG_CF, &ehci->regs->configured_flag);
+        ehci_readl(ehci, &ehci->regs->command); /* unblock posted writes */
 
-        temp = HC_VERSION(readl (&ehci->caps->hc_capbase));
+        temp = HC_VERSION(ehci_readl(ehci, &ehci->caps->hc_capbase));
         ehci_info (ehci,
                 "USB %x.%x started, EHCI %x.%02x, driver %s%s\n",
                 ((ehci->sbrn & 0xf0)>>4), (ehci->sbrn & 0x0f),
                 temp >> 8, temp & 0xff, DRIVER_VERSION,
                 ignore_oc ? ", overcurrent ignored" : "");
 
-        writel (INTR_MASK, &ehci->regs->intr_enable); /* Turn On Interrupts */
+        ehci_writel(ehci, INTR_MASK,
+                    &ehci->regs->intr_enable); /* Turn On Interrupts */
 
         /* GRR this is run-once init(), being done every time the HC starts.
          * So long as they're part of class devices, we can't do it init()
@@ -572,7 +577,7 @@ static irqreturn_t ehci_irq (struct usb_hcd *hcd)
 
         spin_lock (&ehci->lock);
 
-        status = readl (&ehci->regs->status);
+        status = ehci_readl(ehci, &ehci->regs->status);
 
         /* e.g. cardbus physical eject */
         if (status == ~(u32) 0) {
@@ -587,8 +592,8 @@ static irqreturn_t ehci_irq (struct usb_hcd *hcd)
         }
 
         /* clear (just) interrupts */
-        writel (status, &ehci->regs->status);
-        readl (&ehci->regs->command);   /* unblock posted write */
+        ehci_writel(ehci, status, &ehci->regs->status);
+        ehci_readl(ehci, &ehci->regs->command); /* unblock posted write */
         bh = 0;
 
 #ifdef  EHCI_VERBOSE_DEBUG
@@ -619,11 +624,12 @@ static irqreturn_t ehci_irq (struct usb_hcd *hcd)
                 unsigned        i = HCS_N_PORTS (ehci->hcs_params);
 
                 /* resume root hub? */
-                if (!(readl(&ehci->regs->command) & CMD_RUN))
+                if (!(ehci_readl(ehci, &ehci->regs->command) & CMD_RUN))
                         usb_hcd_resume_root_hub(hcd);
 
                 while (i--) {
-                        int pstatus = readl (&ehci->regs->port_status [i]);
+                        int pstatus = ehci_readl(ehci,
+                                                 &ehci->regs->port_status [i]);
 
                         if (pstatus & PORT_OWNER)
                                 continue;
@@ -643,14 +649,15 @@ static irqreturn_t ehci_irq (struct usb_hcd *hcd)
         /* PCI errors [4.15.2.4] */
         if (unlikely ((status & STS_FATAL) != 0)) {
                 /* bogus "fatal" IRQs appear on some chips... why?  */
-                status = readl (&ehci->regs->status);
-                dbg_cmd (ehci, "fatal", readl (&ehci->regs->command));
+                status = ehci_readl(ehci, &ehci->regs->status);
+                dbg_cmd (ehci, "fatal", ehci_readl(ehci,
+                                                   &ehci->regs->command));
                 dbg_status (ehci, "fatal", status);
                 if (status & STS_HALT) {
                         ehci_err (ehci, "fatal error\n");
 dead:
                         ehci_reset (ehci);
-                        writel (0, &ehci->regs->configured_flag);
+                        ehci_writel(ehci, 0, &ehci->regs->configured_flag);
                         /* generic layer kills/unlinks all urbs, then
                          * uses ehci_stop to clean up the rest
                          */
@@ -873,7 +880,8 @@ done:
 static int ehci_get_frame (struct usb_hcd *hcd)
 {
         struct ehci_hcd         *ehci = hcd_to_ehci (hcd);
-        return (readl (&ehci->regs->frame_index) >> 3) % ehci->periodic_size;
+        return (ehci_readl(ehci, &ehci->regs->frame_index) >> 3) %
+                ehci->periodic_size;
 }
 
 /*-------------------------------------------------------------------------*/
diff --git a/drivers/usb/host/ehci-hub.c b/drivers/usb/host/ehci-hub.c
index bfe5f307cba6..df00fcbadfbc 100644
--- a/drivers/usb/host/ehci-hub.c
+++ b/drivers/usb/host/ehci-hub.c
@@ -47,7 +47,7 @@ static int ehci_bus_suspend (struct usb_hcd *hcd)
                 ehci_quiesce (ehci);
                 hcd->state = HC_STATE_QUIESCING;
         }
-        ehci->command = readl (&ehci->regs->command);
+        ehci->command = ehci_readl(ehci, &ehci->regs->command);
         if (ehci->reclaim)
                 ehci->reclaim_ready = 1;
         ehci_work(ehci);
@@ -60,7 +60,7 @@ static int ehci_bus_suspend (struct usb_hcd *hcd)
         ehci->bus_suspended = 0;
         while (port--) {
                 u32 __iomem     *reg = &ehci->regs->port_status [port];
-                u32             t1 = readl (reg) & ~PORT_RWC_BITS;
+                u32             t1 = ehci_readl(ehci, reg) & ~PORT_RWC_BITS;
                 u32             t2 = t1;
 
                 /* keep track of which ports we suspend */
@@ -79,7 +79,7 @@ static int ehci_bus_suspend (struct usb_hcd *hcd)
                 if (t1 != t2) {
                         ehci_vdbg (ehci, "port %d, %08x -> %08x\n",
                                 port + 1, t1, t2);
-                        writel (t2, reg);
+                        ehci_writel(ehci, t2, reg);
                 }
         }
 
@@ -92,8 +92,8 @@ static int ehci_bus_suspend (struct usb_hcd *hcd)
         mask = INTR_MASK;
         if (!device_may_wakeup(&hcd->self.root_hub->dev))
                 mask &= ~STS_PCD;
-        writel(mask, &ehci->regs->intr_enable);
-        readl(&ehci->regs->intr_enable);
+        ehci_writel(ehci, mask, &ehci->regs->intr_enable);
+        ehci_readl(ehci, &ehci->regs->intr_enable);
 
         ehci->next_statechange = jiffies + msecs_to_jiffies(10);
         spin_unlock_irq (&ehci->lock);
@@ -118,26 +118,26 @@ static int ehci_bus_resume (struct usb_hcd *hcd)
          * the last user of the controller, not reset/pm hardware keeping
          * state we gave to it.
          */
-        temp = readl(&ehci->regs->intr_enable);
+        temp = ehci_readl(ehci, &ehci->regs->intr_enable);
         ehci_dbg(ehci, "resume root hub%s\n", temp ? "" : " after power loss");
 
         /* at least some APM implementations will try to deliver
          * IRQs right away, so delay them until we're ready.
          */
-        writel(0, &ehci->regs->intr_enable);
+        ehci_writel(ehci, 0, &ehci->regs->intr_enable);
 
         /* re-init operational registers */
-        writel(0, &ehci->regs->segment);
-        writel(ehci->periodic_dma, &ehci->regs->frame_list);
-        writel((u32) ehci->async->qh_dma, &ehci->regs->async_next);
+        ehci_writel(ehci, 0, &ehci->regs->segment);
+        ehci_writel(ehci, ehci->periodic_dma, &ehci->regs->frame_list);
+        ehci_writel(ehci, (u32) ehci->async->qh_dma, &ehci->regs->async_next);
 
         /* restore CMD_RUN, framelist size, and irq threshold */
-        writel (ehci->command, &ehci->regs->command);
+        ehci_writel(ehci, ehci->command, &ehci->regs->command);
 
         /* manually resume the ports we suspended during bus_suspend() */
         i = HCS_N_PORTS (ehci->hcs_params);
         while (i--) {
-                temp = readl (&ehci->regs->port_status [i]);
+                temp = ehci_readl(ehci, &ehci->regs->port_status [i]);
                 temp &= ~(PORT_RWC_BITS
                         | PORT_WKOC_E | PORT_WKDISC_E | PORT_WKCONN_E);
                 if (test_bit(i, &ehci->bus_suspended) &&
@@ -145,20 +145,20 @@ static int ehci_bus_resume (struct usb_hcd *hcd)
                         ehci->reset_done [i] = jiffies + msecs_to_jiffies (20);
                         temp |= PORT_RESUME;
                 }
-                writel (temp, &ehci->regs->port_status [i]);
+                ehci_writel(ehci, temp, &ehci->regs->port_status [i]);
         }
         i = HCS_N_PORTS (ehci->hcs_params);
         mdelay (20);
         while (i--) {
-                temp = readl (&ehci->regs->port_status [i]);
+                temp = ehci_readl(ehci, &ehci->regs->port_status [i]);
                 if (test_bit(i, &ehci->bus_suspended) &&
                                 (temp & PORT_SUSPEND)) {
                         temp &= ~(PORT_RWC_BITS | PORT_RESUME);
-                        writel (temp, &ehci->regs->port_status [i]);
+                        ehci_writel(ehci, temp, &ehci->regs->port_status [i]);
                         ehci_vdbg (ehci, "resumed port %d\n", i + 1);
                 }
         }
-        (void) readl (&ehci->regs->command);
+        (void) ehci_readl(ehci, &ehci->regs->command);
 
         /* maybe re-activate the schedule(s) */
         temp = 0;
@@ -168,14 +168,14 @@ static int ehci_bus_resume (struct usb_hcd *hcd)
                 temp |= CMD_PSE;
         if (temp) {
                 ehci->command |= temp;
-                writel (ehci->command, &ehci->regs->command);
+                ehci_writel(ehci, ehci->command, &ehci->regs->command);
         }
 
         ehci->next_statechange = jiffies + msecs_to_jiffies(5);
         hcd->state = HC_STATE_RUNNING;
 
         /* Now we can safely re-enable irqs */
-        writel(INTR_MASK, &ehci->regs->intr_enable);
+        ehci_writel(ehci, INTR_MASK, &ehci->regs->intr_enable);
 
         spin_unlock_irq (&ehci->lock);
         return 0;
@@ -217,7 +217,8 @@ static int check_reset_complete (
                 // what happens if HCS_N_CC(params) == 0 ?
                 port_status |= PORT_OWNER;
                 port_status &= ~PORT_RWC_BITS;
-                writel (port_status, &ehci->regs->port_status [index]);
+                ehci_writel(ehci, port_status,
+                            &ehci->regs->port_status [index]);
 
         } else
                 ehci_dbg (ehci, "port %d high speed\n", index + 1);
@@ -268,13 +269,14 @@ ehci_hub_status_data (struct usb_hcd *hcd, char *buf)
         /* port N changes (bit N)? */
         spin_lock_irqsave (&ehci->lock, flags);
         for (i = 0; i < ports; i++) {
-                temp = readl (&ehci->regs->port_status [i]);
+                temp = ehci_readl(ehci, &ehci->regs->port_status [i]);
                 if (temp & PORT_OWNER) {
                         /* don't report this in GetPortStatus */
                         if (temp & PORT_CSC) {
                                 temp &= ~PORT_RWC_BITS;
                                 temp |= PORT_CSC;
-                                writel (temp, &ehci->regs->port_status [i]);
+                                ehci_writel(ehci, temp,
+                                            &ehci->regs->port_status [i]);
                         }
                         continue;
                 }
@@ -373,18 +375,18 @@ static int ehci_hub_control (
                 if (!wIndex || wIndex > ports)
                         goto error;
                 wIndex--;
-                temp = readl (&ehci->regs->port_status [wIndex]);
+                temp = ehci_readl(ehci, &ehci->regs->port_status [wIndex]);
                 if (temp & PORT_OWNER)
                         break;
 
                 switch (wValue) {
                 case USB_PORT_FEAT_ENABLE:
-                        writel (temp & ~PORT_PE,
-                                &ehci->regs->port_status [wIndex]);
+                        ehci_writel(ehci, temp & ~PORT_PE,
+                                    &ehci->regs->port_status [wIndex]);
                         break;
                 case USB_PORT_FEAT_C_ENABLE:
-                        writel((temp & ~PORT_RWC_BITS) | PORT_PEC,
-                                &ehci->regs->port_status [wIndex]);
+                        ehci_writel(ehci, (temp & ~PORT_RWC_BITS) | PORT_PEC,
+                                    &ehci->regs->port_status [wIndex]);
                         break;
                 case USB_PORT_FEAT_SUSPEND:
                         if (temp & PORT_RESET)
@@ -396,8 +398,8 @@ static int ehci_hub_control (
                                         goto error;
                                 /* resume signaling for 20 msec */
                                 temp &= ~(PORT_RWC_BITS | PORT_WAKE_BITS);
-                                writel (temp | PORT_RESUME,
-                                        &ehci->regs->port_status [wIndex]);
+                                ehci_writel(ehci, temp | PORT_RESUME,
+                                            &ehci->regs->port_status [wIndex]);
                                 ehci->reset_done [wIndex] = jiffies
                                                 + msecs_to_jiffies (20);
                         }
@@ -407,16 +409,17 @@ static int ehci_hub_control (
                         break;
                 case USB_PORT_FEAT_POWER:
                         if (HCS_PPC (ehci->hcs_params))
-                                writel (temp & ~(PORT_RWC_BITS | PORT_POWER),
-                                        &ehci->regs->port_status [wIndex]);
+                                ehci_writel(ehci,
+                                          temp & ~(PORT_RWC_BITS | PORT_POWER),
+                                          &ehci->regs->port_status [wIndex]);
                         break;
                 case USB_PORT_FEAT_C_CONNECTION:
-                        writel((temp & ~PORT_RWC_BITS) | PORT_CSC,
-                                &ehci->regs->port_status [wIndex]);
+                        ehci_writel(ehci, (temp & ~PORT_RWC_BITS) | PORT_CSC,
+                                    &ehci->regs->port_status [wIndex]);
                         break;
                 case USB_PORT_FEAT_C_OVER_CURRENT:
-                        writel((temp & ~PORT_RWC_BITS) | PORT_OCC,
-                                &ehci->regs->port_status [wIndex]);
+                        ehci_writel(ehci, (temp & ~PORT_RWC_BITS) | PORT_OCC,
+                                    &ehci->regs->port_status [wIndex]);
                         break;
                 case USB_PORT_FEAT_C_RESET:
                         /* GetPortStatus clears reset */
@@ -424,7 +427,7 @@ static int ehci_hub_control (
                 default:
                         goto error;
                 }
-                readl (&ehci->regs->command);   /* unblock posted write */
+                ehci_readl(ehci, &ehci->regs->command); /* unblock posted write */
                 break;
         case GetHubDescriptor:
                 ehci_hub_descriptor (ehci, (struct usb_hub_descriptor *)
@@ -440,7 +443,7 @@ static int ehci_hub_control (
                         goto error;
                 wIndex--;
                 status = 0;
-                temp = readl (&ehci->regs->port_status [wIndex]);
+                temp = ehci_readl(ehci, &ehci->regs->port_status [wIndex]);
 
                 // wPortChange bits
                 if (temp & PORT_CSC)
@@ -458,12 +461,14 @@ static int ehci_hub_control (
                         ehci->reset_done [wIndex] = 0;
 
                         /* stop resume signaling */
-                        temp = readl (&ehci->regs->port_status [wIndex]);
-                        writel (temp & ~(PORT_RWC_BITS | PORT_RESUME),
-                                &ehci->regs->port_status [wIndex]);
-                        retval = handshake (
-                                        &ehci->regs->port_status [wIndex],
-                                        PORT_RESUME, 0, 2000 /* 2msec */);
+                        temp = ehci_readl(ehci,
+                                          &ehci->regs->port_status [wIndex]);
+                        ehci_writel(ehci,
+                                    temp & ~(PORT_RWC_BITS | PORT_RESUME),
+                                    &ehci->regs->port_status [wIndex]);
+                        retval = handshake(ehci,
+                                           &ehci->regs->port_status [wIndex],
+                                           PORT_RESUME, 0, 2000 /* 2msec */);
                         if (retval != 0) {
                                 ehci_err (ehci, "port %d resume error %d\n",
                                         wIndex + 1, retval);
@@ -480,13 +485,13 @@ static int ehci_hub_control (
                         ehci->reset_done [wIndex] = 0;
 
                         /* force reset to complete */
-                        writel (temp & ~(PORT_RWC_BITS | PORT_RESET),
-                                        &ehci->regs->port_status [wIndex]);
+                        ehci_writel(ehci, temp & ~(PORT_RWC_BITS | PORT_RESET),
+                                    &ehci->regs->port_status [wIndex]);
                         /* REVISIT:  some hardware needs 550+ usec to clear
                          * this bit; seems too long to spin routinely...
                          */
-                        retval = handshake (
-                                        &ehci->regs->port_status [wIndex],
+                        retval = handshake(ehci,
+                                           &ehci->regs->port_status [wIndex],
                                         PORT_RESET, 0, 750);
                         if (retval != 0) {
                                 ehci_err (ehci, "port %d reset error %d\n",
@@ -496,7 +501,8 @@ static int ehci_hub_control (
 
                         /* see what we found out */
                         temp = check_reset_complete (ehci, wIndex,
-                                readl (&ehci->regs->port_status [wIndex]));
+                                ehci_readl(ehci,
+                                           &ehci->regs->port_status [wIndex]));
                 }
 
                 // don't show wPortStatus if it's owned by a companion hc
@@ -541,7 +547,7 @@ static int ehci_hub_control (
                 if (!wIndex || wIndex > ports)
                         goto error;
                 wIndex--;
-                temp = readl (&ehci->regs->port_status [wIndex]);
+                temp = ehci_readl(ehci, &ehci->regs->port_status [wIndex]);
                 if (temp & PORT_OWNER)
                         break;
 
@@ -555,13 +561,13 @@ static int ehci_hub_control (
                                 goto error;
                         if (device_may_wakeup(&hcd->self.root_hub->dev))
                                 temp |= PORT_WAKE_BITS;
-                        writel (temp | PORT_SUSPEND,
-                                &ehci->regs->port_status [wIndex]);
+                        ehci_writel(ehci, temp | PORT_SUSPEND,
+                                    &ehci->regs->port_status [wIndex]);
                         break;
                 case USB_PORT_FEAT_POWER:
                         if (HCS_PPC (ehci->hcs_params))
-                                writel (temp | PORT_POWER,
-                                        &ehci->regs->port_status [wIndex]);
+                                ehci_writel(ehci, temp | PORT_POWER,
+                                            &ehci->regs->port_status [wIndex]);
                         break;
                 case USB_PORT_FEAT_RESET:
                         if (temp & PORT_RESUME)
@@ -589,7 +595,8 @@ static int ehci_hub_control (
                                 ehci->reset_done [wIndex] = jiffies
                                                 + msecs_to_jiffies (50);
                         }
-                        writel (temp, &ehci->regs->port_status [wIndex]);
+                        ehci_writel(ehci, temp,
+                                    &ehci->regs->port_status [wIndex]);
                         break;
 
                 /* For downstream facing ports (these):  one hub port is put
@@ -604,13 +611,14 @@ static int ehci_hub_control (
                         ehci_quiesce(ehci);
                         ehci_halt(ehci);
                         temp |= selector << 16;
-                        writel (temp, &ehci->regs->port_status [wIndex]);
+                        ehci_writel(ehci, temp,
+                                    &ehci->regs->port_status [wIndex]);
                         break;
 
                 default:
                         goto error;
                 }
-                readl (&ehci->regs->command);   /* unblock posted writes */
+                ehci_readl(ehci, &ehci->regs->command); /* unblock posted writes */
                 break;
 
         default:
diff --git a/drivers/usb/host/ehci-pci.c b/drivers/usb/host/ehci-pci.c
index 4bc7970ba3ef..12edc723ec73 100644
--- a/drivers/usb/host/ehci-pci.c
+++ b/drivers/usb/host/ehci-pci.c
@@ -38,7 +38,7 @@ static int ehci_pci_reinit(struct ehci_hcd *ehci, struct pci_dev *pdev)
                 if ((temp & (3 << 13)) == (1 << 13)) {
                         temp &= 0x1fff;
                         ehci->debug = ehci_to_hcd(ehci)->regs + temp;
-                        temp = readl(&ehci->debug->control);
+                        temp = ehci_readl(ehci, &ehci->debug->control);
                         ehci_info(ehci, "debug port %d%s\n",
                                 HCS_DEBUG_PORT(ehci->hcs_params),
                                 (temp & DBGP_ENABLED)
@@ -71,8 +71,24 @@ static int ehci_pci_setup(struct usb_hcd *hcd)
         u32                     temp;
         int                     retval;
 
+        switch (pdev->vendor) {
+        case PCI_VENDOR_ID_TOSHIBA_2:
+                /* celleb's companion chip */
+                if (pdev->device == 0x01b5) {
+#ifdef CONFIG_USB_EHCI_BIG_ENDIAN_MMIO
+                        ehci->big_endian_mmio = 1;
+#else
+                        ehci_warn(ehci,
+                                  "unsupported big endian Toshiba quirk\n");
+#endif
+                }
+                break;
+        }
+
         ehci->caps = hcd->regs;
-        ehci->regs = hcd->regs + HC_LENGTH(readl(&ehci->caps->hc_capbase));
+        ehci->regs = hcd->regs +
+                HC_LENGTH(ehci_readl(ehci, &ehci->caps->hc_capbase));
+
         dbg_hcs_params(ehci, "reset");
         dbg_hcc_params(ehci, "reset");
 
@@ -101,7 +117,7 @@ static int ehci_pci_setup(struct usb_hcd *hcd)
         }
 
         /* cache this readonly data; minimize chip reads */
-        ehci->hcs_params = readl(&ehci->caps->hcs_params);
+        ehci->hcs_params = ehci_readl(ehci, &ehci->caps->hcs_params);
 
         retval = ehci_halt(ehci);
         if (retval)
@@ -235,8 +251,8 @@ static int ehci_pci_suspend(struct usb_hcd *hcd, pm_message_t message)
                 rc = -EINVAL;
                 goto bail;
         }
-        writel (0, &ehci->regs->intr_enable);
-        (void)readl(&ehci->regs->intr_enable);
+        ehci_writel(ehci, 0, &ehci->regs->intr_enable);
+        (void)ehci_readl(ehci, &ehci->regs->intr_enable);
 
         /* make sure snapshot being resumed re-enumerates everything */
         if (message.event == PM_EVENT_PRETHAW) {
@@ -270,13 +286,13 @@ static int ehci_pci_resume(struct usb_hcd *hcd)
         /* If CF is still set, we maintained PCI Vaux power.
          * Just undo the effect of ehci_pci_suspend().
          */
-        if (readl(&ehci->regs->configured_flag) == FLAG_CF) {
+        if (ehci_readl(ehci, &ehci->regs->configured_flag) == FLAG_CF) {
                 int     mask = INTR_MASK;
 
                 if (!device_may_wakeup(&hcd->self.root_hub->dev))
                         mask &= ~STS_PCD;
-                writel(mask, &ehci->regs->intr_enable);
-                readl(&ehci->regs->intr_enable);
+                ehci_writel(ehci, mask, &ehci->regs->intr_enable);
+                ehci_readl(ehci, &ehci->regs->intr_enable);
                 return 0;
         }
 
@@ -300,9 +316,9 @@ static int ehci_pci_resume(struct usb_hcd *hcd)
         /* here we "know" root ports should always stay powered */
         ehci_port_power(ehci, 1);
 
-        writel(ehci->command, &ehci->regs->command);
-        writel(FLAG_CF, &ehci->regs->configured_flag);
-        readl(&ehci->regs->command);    /* unblock posted writes */
+        ehci_writel(ehci, ehci->command, &ehci->regs->command);
+        ehci_writel(ehci, FLAG_CF, &ehci->regs->configured_flag);
+        ehci_readl(ehci, &ehci->regs->command); /* unblock posted writes */
 
         hcd->state = HC_STATE_SUSPENDED;
         return 0;
diff --git a/drivers/usb/host/ehci-q.c b/drivers/usb/host/ehci-q.c
index 62e46dc60e86..e7fbbd00e7cd 100644
--- a/drivers/usb/host/ehci-q.c
+++ b/drivers/usb/host/ehci-q.c
@@ -789,13 +789,14 @@ static void qh_link_async (struct ehci_hcd *ehci, struct ehci_qh *qh)
         head = ehci->async;
         timer_action_done (ehci, TIMER_ASYNC_OFF);
         if (!head->qh_next.qh) {
-                u32     cmd = readl (&ehci->regs->command);
+                u32     cmd = ehci_readl(ehci, &ehci->regs->command);
 
                 if (!(cmd & CMD_ASE)) {
                         /* in case a clear of CMD_ASE didn't take yet */
-                        (void) handshake (&ehci->regs->status, STS_ASS, 0, 150);
+                        (void)handshake(ehci, &ehci->regs->status,
+                                        STS_ASS, 0, 150);
                         cmd |= CMD_ASE | CMD_RUN;
-                        writel (cmd, &ehci->regs->command);
+                        ehci_writel(ehci, cmd, &ehci->regs->command);
                         ehci_to_hcd(ehci)->state = HC_STATE_RUNNING;
                         /* posted write need not be known to HC yet ... */
                 }
@@ -1007,7 +1008,7 @@ static void end_unlink_async (struct ehci_hcd *ehci)
 
 static void start_unlink_async (struct ehci_hcd *ehci, struct ehci_qh *qh)
 {
-        int             cmd = readl (&ehci->regs->command);
+        int             cmd = ehci_readl(ehci, &ehci->regs->command);
         struct ehci_qh  *prev;
 
 #ifdef DEBUG
@@ -1025,7 +1026,8 @@ static void start_unlink_async (struct ehci_hcd *ehci, struct ehci_qh *qh)
                 if (ehci_to_hcd(ehci)->state != HC_STATE_HALT
                                 && !ehci->reclaim) {
                         /* ... and CMD_IAAD clear */
-                        writel (cmd & ~CMD_ASE, &ehci->regs->command);
+                        ehci_writel(ehci, cmd & ~CMD_ASE,
+                                    &ehci->regs->command);
                         wmb ();
                         // handshake later, if we need to
                         timer_action_done (ehci, TIMER_ASYNC_OFF);
@@ -1054,8 +1056,8 @@ static void start_unlink_async (struct ehci_hcd *ehci, struct ehci_qh *qh)
 
         ehci->reclaim_ready = 0;
         cmd |= CMD_IAAD;
-        writel (cmd, &ehci->regs->command);
-        (void) readl (&ehci->regs->command);
+        ehci_writel(ehci, cmd, &ehci->regs->command);
+        (void)ehci_readl(ehci, &ehci->regs->command);
         timer_action (ehci, TIMER_IAA_WATCHDOG);
 }
 
diff --git a/drivers/usb/host/ehci-sched.c b/drivers/usb/host/ehci-sched.c
index 65c402a0fa7a..7b5ae7111f23 100644
--- a/drivers/usb/host/ehci-sched.c
+++ b/drivers/usb/host/ehci-sched.c
@@ -433,20 +433,20 @@ static int enable_periodic (struct ehci_hcd *ehci)
         /* did clearing PSE did take effect yet?
          * takes effect only at frame boundaries...
          */
-        status = handshake (&ehci->regs->status, STS_PSS, 0, 9 * 125);
+        status = handshake(ehci, &ehci->regs->status, STS_PSS, 0, 9 * 125);
         if (status != 0) {
                 ehci_to_hcd(ehci)->state = HC_STATE_HALT;
                 return status;
         }
 
-        cmd = readl (&ehci->regs->command) | CMD_PSE;
-        writel (cmd, &ehci->regs->command);
+        cmd = ehci_readl(ehci, &ehci->regs->command) | CMD_PSE;
+        ehci_writel(ehci, cmd, &ehci->regs->command);
         /* posted write ... PSS happens later */
         ehci_to_hcd(ehci)->state = HC_STATE_RUNNING;
 
         /* make sure ehci_work scans these */
-        ehci->next_uframe = readl (&ehci->regs->frame_index)
-                                % (ehci->periodic_size << 3);
+        ehci->next_uframe = ehci_readl(ehci, &ehci->regs->frame_index)
+                % (ehci->periodic_size << 3);
         return 0;
 }
 
@@ -458,14 +458,14 @@ static int disable_periodic (struct ehci_hcd *ehci)
         /* did setting PSE not take effect yet?
          * takes effect only at frame boundaries...
          */
-        status = handshake (&ehci->regs->status, STS_PSS, STS_PSS, 9 * 125);
+        status = handshake(ehci, &ehci->regs->status, STS_PSS, STS_PSS, 9 * 125);
         if (status != 0) {
                 ehci_to_hcd(ehci)->state = HC_STATE_HALT;
                 return status;
         }
 
-        cmd = readl (&ehci->regs->command) & ~CMD_PSE;
-        writel (cmd, &ehci->regs->command);
+        cmd = ehci_readl(ehci, &ehci->regs->command) & ~CMD_PSE;
+        ehci_writel(ehci, cmd, &ehci->regs->command);
         /* posted write ... */
 
         ehci->next_uframe = -1;
@@ -1336,7 +1336,7 @@ iso_stream_schedule (
                 goto fail;
         }
 
-        now = readl (&ehci->regs->frame_index) % mod;
+        now = ehci_readl(ehci, &ehci->regs->frame_index) % mod;
 
         /* when's the last uframe this urb could start? */
         max = now + mod;
@@ -2088,7 +2088,7 @@ scan_periodic (struct ehci_hcd *ehci)
          */
         now_uframe = ehci->next_uframe;
         if (HC_IS_RUNNING (ehci_to_hcd(ehci)->state))
-                clock = readl (&ehci->regs->frame_index);
+                clock = ehci_readl(ehci, &ehci->regs->frame_index);
         else
                 clock = now_uframe + mod - 1;
         clock %= mod;
@@ -2213,7 +2213,7 @@ restart:
                         if (!HC_IS_RUNNING (ehci_to_hcd(ehci)->state))
                                 break;
                         ehci->next_uframe = now_uframe;
-                        now = readl (&ehci->regs->frame_index) % mod;
+                        now = ehci_readl(ehci, &ehci->regs->frame_index) % mod;
                         if (now_uframe == now)
                                 break;
 
diff --git a/drivers/usb/host/ehci.h b/drivers/usb/host/ehci.h
index 74dbc6c8228f..5f28b74bb8d3 100644
--- a/drivers/usb/host/ehci.h
+++ b/drivers/usb/host/ehci.h
@@ -92,6 +92,7 @@ struct ehci_hcd {			/* one per controller */
         unsigned                is_tdi_rh_tt:1; /* TDI roothub with TT */
         unsigned                no_selective_suspend:1;
         unsigned                has_fsl_port_bug:1; /* FreeScale */
+        unsigned                big_endian_mmio:1;
 
         u8                      sbrn;           /* packed release number */
 
@@ -651,6 +652,37 @@ ehci_port_speed(struct ehci_hcd *ehci, unsigned int portsc)
 #define ehci_has_fsl_portno_bug(e)              (0)
 #endif
 
+/*
+ * While most USB host controllers implement their registers in
+ * little-endian format, a minority (celleb companion chip) implement
+ * them in big endian format.
+ *
+ * This attempts to support either format at compile time without a
+ * runtime penalty, or both formats with the additional overhead
+ * of checking a flag bit.
+ */
+
+#ifdef CONFIG_USB_EHCI_BIG_ENDIAN_MMIO
+#define ehci_big_endian_mmio(e)         ((e)->big_endian_mmio)
+#else
+#define ehci_big_endian_mmio(e)         0
+#endif
+
+static inline unsigned int ehci_readl (const struct ehci_hcd *ehci,
+                                       __u32 __iomem * regs)
+{
+        return ehci_big_endian_mmio(ehci) ?
+                readl_be((__force u32 *)regs) :
+                readl((__force u32 *)regs);
+}
+
+static inline void ehci_writel (const struct ehci_hcd *ehci,
+                                const unsigned int val, __u32 __iomem *regs)
+{
+        ehci_big_endian_mmio(ehci) ?
+                writel_be(val, (__force u32 *)regs) :
+                writel(val, (__force u32 *)regs);
+}
 
 /*-------------------------------------------------------------------------*/