[PATCH] lh7a404 USB host against 2.6.7-rc2

Support for the Sharp LH7A404 OHCI, another non-PCI implementation.
This uses a platform_device and a workaround for a register read
problem.
Signed-off-by: Marc Singer <elf@buici.com>
Signed-off-by: David Brownell <dbrownell@users.sourceforge.net>
Signed-off-by: Greg Kroah-Hartman <greg@kroah.com>

drivers/usb/Kconfig

@@ -7,7 +7,7 @@ menu "USB support"
 # ARM SA1111 chips have a non-PCI based "OHCI-compatible" USB host interface.
 config USB
 	tristate "Support for Host-side USB"
-	depends on PCI || SA1111 || ARCH_OMAP1510 || ARCH_OMAP1610
+	depends on PCI || SA1111 || ARCH_OMAP1510 || ARCH_OMAP1610 || ARCH_LH7A404
 	---help---
 	  Universal Serial Bus (USB) is a specification for a serial bus
 	  subsystem which offers higher speeds and more features than the

drivers/usb/host/ohci-dbg.c

@@ -134,13 +134,13 @@ ohci_dump_status (struct ohci_hcd *controller, char **next, unsigned *size)
 	struct ohci_regs	*regs = controller->regs;
 	u32			temp;
 
-	temp = readl (&regs->revision) & 0xff;
+	temp = ohci_readl (&regs->revision) & 0xff;
 	ohci_dbg_sw (controller, next, size,
 		"OHCI %d.%d, %s legacy support registers\n",
 		0x03 & (temp >> 4), (temp & 0x0f),
 		(temp & 0x10) ? "with" : "NO");
 
-	temp = readl (&regs->control);
+	temp = ohci_readl (&regs->control);
 	ohci_dbg_sw (controller, next, size,
 		"control 0x%03x%s%s%s HCFS=%s%s%s%s%s CBSR=%d\n",
 		temp,
@@ -155,7 +155,7 @@ ohci_dump_status (struct ohci_hcd *controller, char **next, unsigned *size)
 		temp & OHCI_CTRL_CBSR
 		);
 
-	temp = readl (&regs->cmdstatus);
+	temp = ohci_readl (&regs->cmdstatus);
 	ohci_dbg_sw (controller, next, size,
 		"cmdstatus 0x%05x SOC=%d%s%s%s%s\n", temp,
 		(temp & OHCI_SOC) >> 16,
@@ -166,26 +166,26 @@ ohci_dump_status (struct ohci_hcd *controller, char **next, unsigned *size)
 		);
 
 	ohci_dump_intr_mask (controller, "intrstatus",
-			readl (&regs->intrstatus), next, size);
+			ohci_readl (&regs->intrstatus), next, size);
 	ohci_dump_intr_mask (controller, "intrenable",
-			readl (&regs->intrenable), next, size);
+			ohci_readl (&regs->intrenable), next, size);
 	// intrdisable always same as intrenable
 
 	maybe_print_eds (controller, "ed_periodcurrent",
-			readl (&regs->ed_periodcurrent), next, size);
+			ohci_readl (&regs->ed_periodcurrent), next, size);
 
 	maybe_print_eds (controller, "ed_controlhead",
-			readl (&regs->ed_controlhead), next, size);
+			ohci_readl (&regs->ed_controlhead), next, size);
 	maybe_print_eds (controller, "ed_controlcurrent",
-			readl (&regs->ed_controlcurrent), next, size);
+			ohci_readl (&regs->ed_controlcurrent), next, size);
 
 	maybe_print_eds (controller, "ed_bulkhead",
-			readl (&regs->ed_bulkhead), next, size);
+			ohci_readl (&regs->ed_bulkhead), next, size);
 	maybe_print_eds (controller, "ed_bulkcurrent",
-			readl (&regs->ed_bulkcurrent), next, size);
+			ohci_readl (&regs->ed_bulkcurrent), next, size);
 
 	maybe_print_eds (controller, "donehead",
-			readl (&regs->donehead), next, size);
+			ohci_readl (&regs->donehead), next, size);
 }
 
 #define dbg_port_sw(hc,num,value,next,size) \
@@ -637,7 +637,7 @@ show_registers (struct class_device *class_dev, char *buf)
 			"hcca frame 0x%04x\n", OHCI_FRAME_NO(ohci->hcca));
 
 	/* other registers mostly affect frame timings */
-	rdata = readl (&regs->fminterval);
+	rdata = ohci_readl (&regs->fminterval);
 	temp = scnprintf (next, size,
 			"fmintvl 0x%08x %sFSMPS=0x%04x FI=0x%04x\n",
 			rdata, (rdata >> 31) ? " FIT" : "",
@@ -645,20 +645,20 @@ show_registers (struct class_device *class_dev, char *buf)
 	size -= temp;
 	next += temp;
 
-	rdata = readl (&regs->fmremaining);
+	rdata = ohci_readl (&regs->fmremaining);
 	temp = scnprintf (next, size, "fmremaining 0x%08x %sFR=0x%04x\n",
 			rdata, (rdata >> 31) ? " FRT" : "",
 			rdata & 0x3fff);
 	size -= temp;
 	next += temp;
 
-	rdata = readl (&regs->periodicstart);
+	rdata = ohci_readl (&regs->periodicstart);
 	temp = scnprintf (next, size, "periodicstart 0x%04x\n",
 			rdata & 0x3fff);
 	size -= temp;
 	next += temp;
 
-	rdata = readl (&regs->lsthresh);
+	rdata = ohci_readl (&regs->lsthresh);
 	temp = scnprintf (next, size, "lsthresh 0x%04x\n",
 			rdata & 0x3fff);
 	size -= temp;

drivers/usb/host/ohci-hcd.c

@@ -17,6 +17,7 @@
  *
  * History:
  * 
+ * 2004/03/24 LH7A404 support (Durgesh Pattamatta & Marc Singer)
  * 2004/02/04 use generic dma_* functions instead of pci_* (dsaxena@plexity.net)
  * 2003/02/24 show registers in sysfs (Kevin Brosius)
  *
@@ -393,7 +394,7 @@ static int hc_reset (struct ohci_hcd *ohci)
 
 	/* boot firmware should have set this up (5.1.1.3.1) */
 	if (!ohci->fminterval) {
-		temp = readl (&ohci->regs->fminterval);
+		temp = ohci_readl (&ohci->regs->fminterval);
 		if (temp & 0x3fff0000)
 			ohci->fminterval = temp;
 		else
@@ -405,7 +406,7 @@ static int hc_reset (struct ohci_hcd *ohci)
 	 * On PA-RISC, PDC can leave IR set incorrectly; ignore it there.
 	 */
 #ifndef __hppa__
-	if (readl (&ohci->regs->control) & OHCI_CTRL_IR) {
+	if (ohci_readl (&ohci->regs->control) & OHCI_CTRL_IR) {
 		ohci_dbg (ohci, "USB HC TakeOver from BIOS/SMM\n");
 
 		/* this timeout is arbitrary.  we make it long, so systems
@@ -416,7 +417,7 @@ static int hc_reset (struct ohci_hcd *ohci)
 
 		writel (OHCI_INTR_OC, &ohci->regs->intrenable);
 		writel (OHCI_OCR, &ohci->regs->cmdstatus);
-		while (readl (&ohci->regs->control) & OHCI_CTRL_IR) {
+		while (ohci_readl (&ohci->regs->control) & OHCI_CTRL_IR) {
 			msleep (10);
 			if (--temp == 0) {
 				ohci_err (ohci, "USB HC TakeOver failed!\n");
@@ -430,13 +431,13 @@ static int hc_reset (struct ohci_hcd *ohci)
 	writel (OHCI_INTR_MIE, &ohci->regs->intrdisable);
 
 	ohci_dbg (ohci, "reset, control = 0x%x\n",
-		readl (&ohci->regs->control));
+		  ohci_readl (&ohci->regs->control));
 
   	/* Reset USB (needed by some controllers); RemoteWakeupConnected
 	 * saved if boot firmware (BIOS/SMM/...) told us it's connected
 	 * (for OHCI integrated on mainboard, it normally is)
 	 */
-	ohci->hc_control = readl (&ohci->regs->control);
+	ohci->hc_control = ohci_readl (&ohci->regs->control);
 	ohci->hc_control &= OHCI_CTRL_RWC;	/* hcfs 0 = RESET */
 	if (ohci->hc_control)
 		ohci->hcd.can_wakeup = 1;
@@ -450,13 +451,13 @@ static int hc_reset (struct ohci_hcd *ohci)
 				&ohci->regs->roothub.portstatus [temp]);
 	}
 	// flush those pci writes
-	(void) readl (&ohci->regs->control);
+	(void) ohci_readl (&ohci->regs->control);
 	msleep (50);
 
 	/* HC Reset requires max 10 us delay */
 	writel (OHCI_HCR,  &ohci->regs->cmdstatus);
 	temp = 30;	/* ... allow extra time */
-	while ((readl (&ohci->regs->cmdstatus) & OHCI_HCR) != 0) {
+	while ((ohci_readl (&ohci->regs->cmdstatus) & OHCI_HCR) != 0) {
 		if (--temp == 0) {
 			ohci_err (ohci, "USB HC reset timed out!\n");
 			return -1;
@@ -473,7 +474,7 @@ static int hc_reset (struct ohci_hcd *ohci)
 	 */
 	writel (ohci->hc_control, &ohci->regs->control);
 	// flush those pci writes
-	(void) readl (&ohci->regs->control);
+	(void) ohci_readl (&ohci->regs->control);
 
 	return 0;
 }
@@ -505,8 +506,8 @@ static int hc_start (struct ohci_hcd *ohci)
 	/* some OHCI implementations are finicky about how they init.
 	 * bogus values here mean not even enumeration could work.
 	 */
-	if ((readl (&ohci->regs->fminterval) & 0x3fff0000) == 0
-			|| !readl (&ohci->regs->periodicstart)) {
+	if ((ohci_readl (&ohci->regs->fminterval) & 0x3fff0000) == 0
+			|| !ohci_readl (&ohci->regs->periodicstart)) {
 		ohci_err (ohci, "init err\n");
 		return -EOVERFLOW;
 	}
@@ -548,7 +549,7 @@ static int hc_start (struct ohci_hcd *ohci)
 	writel (RH_HS_LPSC, &ohci->regs->roothub.status);
 	writel (power_switching ? RH_B_PPCM : 0, &ohci->regs->roothub.b);
 	// flush those pci writes
-	(void) readl (&ohci->regs->control);
+	(void) ohci_readl (&ohci->regs->control);
 
 	// POTPGT delay is bits 24-31, in 2 ms units.
 	mdelay ((roothub_a (ohci) >> 23) & 0x1fe);
@@ -592,19 +593,20 @@ static irqreturn_t ohci_irq (struct usb_hcd *hcd, struct pt_regs *ptregs)
 	struct ohci_regs	*regs = ohci->regs;
  	int			ints; 
 
-	/* we can eliminate a (slow) readl() if _only_ WDH caused this irq */
+	/* we can eliminate a (slow) ohci_readl()
+	   if _only_ WDH caused this irq */
 	if ((ohci->hcca->done_head != 0)
 			&& ! (le32_to_cpup (&ohci->hcca->done_head) & 0x01)) {
 		ints =  OHCI_INTR_WDH;
 
 	/* cardbus/... hardware gone before remove() */
-	} else if ((ints = readl (&regs->intrstatus)) == ~(u32)0) {
+	} else if ((ints = ohci_readl (&regs->intrstatus)) == ~(u32)0) {
 		disable (ohci);
 		ohci_dbg (ohci, "device removed!\n");
 		return IRQ_HANDLED;
 
 	/* interrupt for some other device? */
-	} else if ((ints &= readl (&regs->intrenable)) == 0) {
+	} else if ((ints &= ohci_readl (&regs->intrenable)) == 0) {
 		return IRQ_NONE;
 	} 
 
@@ -650,7 +652,7 @@ static irqreturn_t ohci_irq (struct usb_hcd *hcd, struct pt_regs *ptregs)
 		writel (ints, &regs->intrstatus);
 		writel (OHCI_INTR_MIE, &regs->intrenable);	
 		// flush those pci writes
-		(void) readl (&ohci->regs->control);
+		(void) ohci_readl (&ohci->regs->control);
 	}
 
 	return IRQ_HANDLED;
@@ -798,6 +800,14 @@ MODULE_LICENSE ("GPL");
 #include "ohci-omap.c"
 #endif
 
-#if !(defined(CONFIG_PCI) || defined(CONFIG_SA1111) || defined(CONFIG_ARCH_OMAP))
+#ifdef CONFIG_ARCH_LH7A404
+#include "ohci-lh7a404.c"
+#endif
+
+#if !(defined(CONFIG_PCI) \
+      || defined(CONFIG_SA1111) \
+      || defined(CONFIG_ARCH_OMAP) \
+      || defined (CONFIG_ARCH_LH7A404) \
+	)
 #error "missing bus glue for ohci-hcd"
 #endif

drivers/usb/host/ohci-hub.c

@@ -20,20 +20,20 @@
  * till some bits (mostly reserved) are clear; ok for all revs.
  */
 #define read_roothub(hc, register, mask) ({ \
-	u32 temp = readl (&hc->regs->roothub.register); \
+	u32 temp = ohci_readl (&hc->regs->roothub.register); \
 	if (temp == -1) \
 		disable (hc); \
 	else if (hc->flags & OHCI_QUIRK_AMD756) \
 		while (temp & mask) \
-			temp = readl (&hc->regs->roothub.register); \
+			temp = ohci_readl (&hc->regs->roothub.register); \
 	temp; })
 
 static u32 roothub_a (struct ohci_hcd *hc)
 	{ return read_roothub (hc, a, 0xfc0fe000); }
 static inline u32 roothub_b (struct ohci_hcd *hc)
-	{ return readl (&hc->regs->roothub.b); }
+	{ return ohci_readl (&hc->regs->roothub.b); }
 static inline u32 roothub_status (struct ohci_hcd *hc)
-	{ return readl (&hc->regs->roothub.status); }
+	{ return ohci_readl (&hc->regs->roothub.status); }
 static u32 roothub_portstatus (struct ohci_hcd *hc, int i)
 	{ return read_roothub (hc, portstatus [i], 0xffe0fce0); }
 
@@ -83,14 +83,14 @@ static int ohci_hub_suspend (struct usb_hcd *hcd)
 
 	spin_lock_irq (&ohci->lock);
 
-	ohci->hc_control = readl (&ohci->regs->control);
+	ohci->hc_control = ohci_readl (&ohci->regs->control);
 	switch (ohci->hc_control & OHCI_CTRL_HCFS) {
 	case OHCI_USB_RESUME:
 		ohci_dbg (ohci, "resume/suspend?\n");
 		ohci->hc_control &= ~OHCI_CTRL_HCFS;
 		ohci->hc_control |= OHCI_USB_RESET;
 		writel (ohci->hc_control, &ohci->regs->control);
-		(void) readl (&ohci->regs->control);
+		(void) ohci_readl (&ohci->regs->control);
 		/* FALL THROUGH */
 	case OHCI_USB_RESET:
 		status = -EBUSY;
@@ -109,7 +109,7 @@ static int ohci_hub_suspend (struct usb_hcd *hcd)
 
 		ohci->hc_control &= ~OHCI_SCHED_ENABLES;
 		writel (ohci->hc_control, &ohci->regs->control);
-		ohci->hc_control = readl (&ohci->regs->control);
+		ohci->hc_control = ohci_readl (&ohci->regs->control);
 		writel (OHCI_INTR_SF, &ohci->regs->intrstatus);
 
 		/* sched disables take effect on the next frame,
@@ -120,7 +120,7 @@ static int ohci_hub_suspend (struct usb_hcd *hcd)
 		while (limit > 0) {
 			udelay (250);
 			limit =- 250;
-			if (readl (&ohci->regs->intrstatus) & OHCI_INTR_SF)
+			if (ohci_readl (&ohci->regs->intrstatus) & OHCI_INTR_SF)
 				break;
 		}
 		dl_done_list (ohci, 0);
@@ -128,7 +128,7 @@ static int ohci_hub_suspend (struct usb_hcd *hcd)
 	}
 	dl_done_list (ohci, 0);
 	finish_unlinks (ohci, OHCI_FRAME_NO(ohci->hcca), 0);
-	writel (readl (&ohci->regs->intrstatus), &ohci->regs->intrstatus);
+	writel (ohci_readl (&ohci->regs->intrstatus), &ohci->regs->intrstatus);
 
 	/* maybe resume can wake root hub */
 	if (ohci->hcd.remote_wakeup)
@@ -140,7 +140,7 @@ static int ohci_hub_suspend (struct usb_hcd *hcd)
 	ohci->hc_control &= ~OHCI_CTRL_HCFS;
 	ohci->hc_control |= OHCI_USB_SUSPEND;
 	writel (ohci->hc_control, &ohci->regs->control);
-	(void) readl (&ohci->regs->control);
+	(void) ohci_readl (&ohci->regs->control);
 
 	/* no resumes until devices finish suspending */
 	ohci->next_statechange = jiffies + msecs_to_jiffies (5);
@@ -179,13 +179,13 @@ static int ohci_hub_resume (struct usb_hcd *hcd)
 		return -EAGAIN;
 
 	spin_lock_irq (&ohci->lock);
-	ohci->hc_control = readl (&ohci->regs->control);
+	ohci->hc_control = ohci_readl (&ohci->regs->control);
 	switch (ohci->hc_control & OHCI_CTRL_HCFS) {
 	case OHCI_USB_SUSPEND:
 		ohci->hc_control &= ~(OHCI_CTRL_HCFS|OHCI_SCHED_ENABLES);
 		ohci->hc_control |= OHCI_USB_RESUME;
 		writel (ohci->hc_control, &ohci->regs->control);
-		(void) readl (&ohci->regs->control);
+		(void) ohci_readl (&ohci->regs->control);
 		ohci_dbg (ohci, "resume root hub\n");
 		break;
 	case OHCI_USB_RESUME:
@@ -210,7 +210,7 @@ static int ohci_hub_resume (struct usb_hcd *hcd)
 	temp = roothub_a (ohci) & RH_A_NDP;
 	enables = 0;
 	while (temp--) {
-		u32 stat = readl (&ohci->regs->roothub.portstatus [temp]);
+		u32 stat = ohci_readl (&ohci->regs->roothub.portstatus [temp]);
 
 		/* force global, not selective, resume */
 		if (!(stat & RH_PS_PSS))
@@ -222,7 +222,7 @@ static int ohci_hub_resume (struct usb_hcd *hcd)
 	ohci->hcd.state = USB_STATE_RESUMING;
 	mdelay (20 /* usb 11.5.1.10 */ + 15);
 
-	temp = readl (&ohci->regs->control);
+	temp = ohci_readl (&ohci->regs->control);
 	temp &= OHCI_CTRL_HCFS;
 	if (temp != OHCI_USB_RESUME) {
 		ohci_err (ohci, "controller won't resume\n");
@@ -243,11 +243,11 @@ static int ohci_hub_resume (struct usb_hcd *hcd)
 	writel (OHCI_INTR_INIT, &ohci->regs->intrenable);
 	if (ohci->ed_rm_list)
 		writel (OHCI_INTR_SF, &ohci->regs->intrenable);
-	writel (readl (&ohci->regs->intrstatus), &ohci->regs->intrstatus);
+	writel (ohci_readl (&ohci->regs->intrstatus), &ohci->regs->intrstatus);
 
 	/* Then re-enable operations */
 	writel (OHCI_USB_OPER, &ohci->regs->control);
-	(void) readl (&ohci->regs->control);
+	(void) ohci_readl (&ohci->regs->control);
 	msleep (3);
 
 	temp = OHCI_CONTROL_INIT | OHCI_USB_OPER;
@@ -255,7 +255,7 @@ static int ohci_hub_resume (struct usb_hcd *hcd)
 		temp |= OHCI_CTRL_RWC;
 	ohci->hc_control = temp;
 	writel (temp, &ohci->regs->control);
-	(void) readl (&ohci->regs->control);
+	(void) ohci_readl (&ohci->regs->control);
 
 	/* TRSMRCY */
 	msleep (10);
@@ -290,7 +290,7 @@ static int ohci_hub_resume (struct usb_hcd *hcd)
 		writel (ohci->hc_control, &ohci->regs->control);
 		if (temp)
 			writel (status, &ohci->regs->cmdstatus);
-		(void) readl (&ohci->regs->control);
+		(void) ohci_readl (&ohci->regs->control);
 	}
 
 	ohci->hcd.state = USB_STATE_RUNNING;
@@ -332,7 +332,7 @@ ohci_hub_status_data (struct usb_hcd *hcd, char *buf)
 		if (!HCD_IS_RUNNING(ohci->hcd.state))
 			return -ESHUTDOWN;
 		ohci_err (ohci, "bogus NDP=%d, rereads as NDP=%d\n",
-			ports, readl (&ohci->regs->roothub.a) & RH_A_NDP);
+			ports, ohci_readl (&ohci->regs->roothub.a) & RH_A_NDP);
 		/* retry later; "should not happen" */
 		return 0;
 	}
@@ -496,7 +496,7 @@ static int ohci_hub_control (
 			goto error;
 		}
 		writel (temp, &ohci->regs->roothub.portstatus [wIndex]);
-		// readl (&ohci->regs->roothub.portstatus [wIndex]);
+		// ohci_readl (&ohci->regs->roothub.portstatus [wIndex]);
 		break;
 	case GetHubDescriptor:
 		ohci_hub_descriptor (ohci, (struct usb_hub_descriptor *) buf);
@@ -541,7 +541,7 @@ static int ohci_hub_control (
 				&ohci->regs->roothub.portstatus [wIndex]);
 			break;
 		case USB_PORT_FEAT_RESET:
-			temp = readl (&ohci->regs->roothub.portstatus [wIndex]);
+			temp = ohci_readl (&ohci->regs->roothub.portstatus [wIndex]);
 			if (temp & RH_PS_CCS)
 				writel (RH_PS_PRS,
 				    &ohci->regs->roothub.portstatus [wIndex]);

drivers/usb/host/ohci-q.c

@@ -321,7 +321,7 @@ static void ed_deschedule (struct ohci_hcd *ohci, struct ed *ed)
 			if (!ed->hwNextED) {
 				ohci->hc_control &= ~OHCI_CTRL_CLE;
 				writel (ohci->hc_control, &ohci->regs->control);
-				// a readl() later syncs CLE with the HC
+				// a ohci_readl() later syncs CLE with the HC
 			} else
 				writel (le32_to_cpup (&ed->hwNextED),
 					&ohci->regs->ed_controlhead);
@@ -345,7 +345,7 @@ static void ed_deschedule (struct ohci_hcd *ohci, struct ed *ed)
 			if (!ed->hwNextED) {
 				ohci->hc_control &= ~OHCI_CTRL_BLE;
 				writel (ohci->hc_control, &ohci->regs->control);
-				// a readl() later syncs BLE with the HC
+				// a ohci_readl() later syncs BLE with the HC
 			} else
 				writel (le32_to_cpup (&ed->hwNextED),
 					&ohci->regs->ed_bulkhead);
@@ -481,7 +481,7 @@ static void start_ed_unlink (struct ohci_hcd *ohci, struct ed *ed)
 	writel (OHCI_INTR_SF, &ohci->regs->intrstatus);
 	writel (OHCI_INTR_SF, &ohci->regs->intrenable);
 	// flush those writes, and get latest HCCA contents
-	(void) readl (&ohci->regs->control);
+	(void) ohci_readl (&ohci->regs->control);
 
 	/* SF interrupt might get delayed; record the frame counter value that
 	 * indicates when the HC isn't looking at it, so concurrent unlinks

drivers/usb/host/ohci.h

@@ -429,3 +429,22 @@ static inline void periodic_reinit (struct ohci_hcd *ohci)
 #	define ohci_vdbg(ohci, fmt, args...) do { } while (0)
 #endif
 
+#ifdef CONFIG_ARCH_LH7A404
+	/* Marc Singer: at the time this code was written, the LH7A404
+	 * had a problem reading the USB host registers.  This
+	 * implementation of the ohci_readl function performs the read
+	 * twice as a work-around.
+	 */
+static inline unsigned int ohci_readl (void* regs)
+{
+	*(volatile unsigned int*) regs;
+	return *(volatile unsigned int*) regs;
+}
+#else
+	/* Standard version of ohci_readl uses standard, platform
+	 * specific implementation. */
+static inline unsigned int ohci_readl (void* regs)
+{
+	return readl (regs);
+}
+#endif

usb/host/ohci-lh7a404.c

+/*
+ * OHCI HCD (Host Controller Driver) for USB.
+ *
+ * (C) Copyright 1999 Roman Weissgaerber <weissg@vienna.at>
+ * (C) Copyright 2000-2002 David Brownell <dbrownell@users.sourceforge.net>
+ * (C) Copyright 2002 Hewlett-Packard Company
+ *
+ * Bus Glue for Sharp LH7A404
+ *
+ * Written by Christopher Hoover <ch@hpl.hp.com>
+ * Based on fragments of previous driver by Rusell King et al.
+ *
+ * Modified for LH7A404 from ohci-sa1111.c
+ *  by Durgesh Pattamatta <pattamattad@sharpsec.com>
+ *
+ * This file is licenced under the GPL.
+ */
+
+#include <asm/hardware.h>
+#include <asm/mach-types.h>
+#include <asm/arch/hardware.h>
+
+
+extern int usb_disabled(void);
+
+/*-------------------------------------------------------------------------*/
+
+static void lh7a404_start_hc(struct platform_device *dev)
+{
+	printk(KERN_DEBUG __FILE__
+	       ": starting LH7A404 OHCI USB Controller\n");
+
+	/*
+	 * Now, carefully enable the USB clock, and take
+	 * the USB host controller out of reset.
+	 */
+	CSC_PWRCNT |= CSC_PWRCNT_USBH_EN; /* Enable clock */
+	udelay(1000);
+	USBH_CMDSTATUS = OHCI_HCR;
+	
+	printk(KERN_DEBUG __FILE__
+		   ": Clock to USB host has been enabled \n");
+}
+
+static void lh7a404_stop_hc(struct platform_device *dev)
+{
+	printk(KERN_DEBUG __FILE__
+	       ": stopping LH7A404 OHCI USB Controller\n");
+
+	CSC_PWRCNT &= ~CSC_PWRCNT_USBH_EN; /* Disable clock */
+}
+
+
+/*-------------------------------------------------------------------------*/
+
+
+static irqreturn_t usb_hcd_lh7a404_hcim_irq (int irq, void *__hcd,
+					     struct pt_regs * r)
+{
+	struct usb_hcd *hcd = __hcd;
+
+	return usb_hcd_irq(irq, hcd, r);
+}
+
+/*-------------------------------------------------------------------------*/
+
+void usb_hcd_lh7a404_remove (struct usb_hcd *, struct platform_device *);
+
+/* configure so an HC device and id are always provided */
+/* always called with process context; sleeping is OK */
+
+
+/**
+ * usb_hcd_lh7a404_probe - initialize LH7A404-based HCDs
+ * Context: !in_interrupt()
+ *
+ * Allocates basic resources for this USB host controller, and
+ * then invokes the start() method for the HCD associated with it
+ * through the hotplug entry's driver_data.
+ *
+ */
+int usb_hcd_lh7a404_probe (const struct hc_driver *driver,
+			  struct usb_hcd **hcd_out,
+			  struct platform_device *dev)
+{
+	int retval;
+	struct usb_hcd *hcd = 0;
+
+	unsigned int *addr = NULL;
+
+	if (!request_mem_region(dev->resource[0].start,
+				dev->resource[0].end
+				- dev->resource[0].start + 1, hcd_name)) {
+		pr_debug("request_mem_region failed");
+		return -EBUSY;
+	}
+	
+	
+	lh7a404_start_hc(dev);
+	
+	addr = ioremap(dev->resource[0].start,
+		       dev->resource[0].end
+		       - dev->resource[0].start + 1);
+	if (!addr) {
+		pr_debug("ioremap failed");
+		retval = -ENOMEM;
+		goto err1;
+	}
+	
+
+	hcd = driver->hcd_alloc ();
+	if (hcd == NULL){
+		pr_debug ("hcd_alloc failed");
+		retval = -ENOMEM;
+		goto err1;
+	}
+
+	if(dev->resource[1].flags != IORESOURCE_IRQ){
+		pr_debug ("resource[1] is not IORESOURCE_IRQ");
+		retval = -ENOMEM;
+		goto err1;
+	}
+
+	hcd->driver = (struct hc_driver *) driver;
+	hcd->description = driver->description;
+	hcd->irq = dev->resource[1].start;
+	hcd->regs = addr;
+	hcd->self.controller = &dev->dev;
+
+	retval = hcd_buffer_create (hcd);
+	if (retval != 0) {
+		pr_debug ("pool alloc fail");
+		goto err1;
+	}
+
+	retval = request_irq (hcd->irq, usb_hcd_lh7a404_hcim_irq, SA_INTERRUPT,
+			      hcd->description, hcd);
+	if (retval != 0) {
+		pr_debug("request_irq failed");
+		retval = -EBUSY;
+		goto err2;
+	}
+
+	pr_debug ("%s (LH7A404) at 0x%p, irq %d",
+	     hcd->description, hcd->regs, hcd->irq);
+
+	usb_bus_init (&hcd->self);
+	hcd->self.op = &usb_hcd_operations;
+	hcd->self.hcpriv = (void *) hcd;
+	hcd->self.bus_name = "lh7a404";
+	hcd->product_desc = "LH7A404 OHCI";
+
+	INIT_LIST_HEAD (&hcd->dev_list);
+
+	usb_register_bus (&hcd->self);
+
+	if ((retval = driver->start (hcd)) < 0)
+	{
+		usb_hcd_lh7a404_remove(hcd, dev);
+		return retval;
+	}
+
+	*hcd_out = hcd;
+	return 0;
+
+ err2:
+	hcd_buffer_destroy (hcd);
+	if (hcd)
+		driver->hcd_free(hcd);
+ err1:
+	lh7a404_stop_hc(dev);
+	release_mem_region(dev->resource[0].start,
+				dev->resource[0].end
+			   - dev->resource[0].start + 1);
+	return retval;
+}
+
+
+/* may be called without controller electrically present */
+/* may be called with controller, bus, and devices active */
+
+/**
+ * usb_hcd_lh7a404_remove - shutdown processing for LH7A404-based HCDs
+ * @dev: USB Host Controller being removed
+ * Context: !in_interrupt()
+ *
+ * Reverses the effect of usb_hcd_lh7a404_probe(), first invoking
+ * the HCD's stop() method.  It is always called from a thread
+ * context, normally "rmmod", "apmd", or something similar.
+ *
+ */
+void usb_hcd_lh7a404_remove (struct usb_hcd *hcd, struct platform_device *dev)
+{
+	struct usb_device	*hub;
+	void *base;
+
+	pr_debug ("remove: %s, state %x", hcd->self.bus_name, hcd->state);
+
+	if (in_interrupt ())
+		BUG ();
+
+	hub = hcd->self.root_hub;
+	hcd->state = USB_STATE_QUIESCING;
+
+	pr_debug ("%s: roothub graceful disconnect", hcd->self.bus_name);
+	usb_disconnect (&hub);
+
+	hcd->driver->stop (hcd);
+	hcd->state = USB_STATE_HALT;
+
+	free_irq (hcd->irq, hcd);
+	hcd_buffer_destroy (hcd);
+
+	usb_deregister_bus (&hcd->self);
+
+	base = hcd->regs;
+	hcd->driver->hcd_free (hcd);
+
+	lh7a404_stop_hc(dev);
+	release_mem_region(dev->resource[0].start,
+			   dev->resource[0].end
+			   - dev->resource[0].start + 1);
+}
+
+/*-------------------------------------------------------------------------*/
+
+static int __devinit
+ohci_lh7a404_start (struct usb_hcd *hcd)
+{
+	struct ohci_hcd	*ohci = hcd_to_ohci (hcd);
+	int		ret;
+
+	ohci_dbg (ohci, "ohci_lh7a404_start, ohci:%p", ohci);
+			
+	ohci->hcca = dma_alloc_coherent (hcd->self.controller,
+			sizeof *ohci->hcca, &ohci->hcca_dma, 0);
+	if (!ohci->hcca)
+		return -ENOMEM;
+
+	ohci_dbg (ohci, "ohci_lh7a404_start, ohci->hcca:%p",
+			ohci->hcca);
+
+	memset (ohci->hcca, 0, sizeof (struct ohci_hcca));
+
+	if ((ret = ohci_mem_init (ohci)) < 0) {
+		ohci_stop (hcd);
+		return ret;
+	}
+	ohci->regs = hcd->regs;
+
+	if (hc_reset (ohci) < 0) {
+		ohci_stop (hcd);
+		return -ENODEV;
+	}
+
+	if (hc_start (ohci) < 0) {
+		err ("can't start %s", ohci->hcd.self.bus_name);
+		ohci_stop (hcd);
+		return -EBUSY;
+	}
+	create_debug_files (ohci);
+
+#ifdef	DEBUG
+	ohci_dump (ohci, 1);
+#endif /*DEBUG*/
+	return 0;
+}
+
+/*-------------------------------------------------------------------------*/
+
+static const struct hc_driver ohci_lh7a404_hc_driver = {
+	.description =		hcd_name,
+
+	/*
+	 * generic hardware linkage
+	 */
+	.irq =			ohci_irq,
+	.flags =		HCD_USB11,
+
+	/*
+	 * basic lifecycle operations
+	 */
+	.start =		ohci_lh7a404_start,
+#ifdef	CONFIG_PM
+	/* suspend:		ohci_lh7a404_suspend,  -- tbd */
+	/* resume:		ohci_lh7a404_resume,   -- tbd */
+#endif /*CONFIG_PM*/
+	.stop =			ohci_stop,
+
+	/*
+	 * memory lifecycle (except per-request)
+	 */
+	.hcd_alloc =		ohci_hcd_alloc,
+	.hcd_free =		ohci_hcd_free,
+
+	/*
+	 * managing i/o requests and associated device resources
+	 */
+	.urb_enqueue =		ohci_urb_enqueue,
+	.urb_dequeue =		ohci_urb_dequeue,
+	.endpoint_disable =	ohci_endpoint_disable,
+
+	/*
+	 * scheduling support
+	 */
+	.get_frame_number =	ohci_get_frame,
+
+	/*
+	 * root hub support
+	 */
+	.hub_status_data =	ohci_hub_status_data,
+	.hub_control =		ohci_hub_control,
+};
+
+/*-------------------------------------------------------------------------*/
+
+static int ohci_hcd_lh7a404_drv_probe(struct device *dev)
+{
+	struct platform_device *pdev = to_platform_device(dev);
+	struct usb_hcd *hcd = NULL;
+	int ret;
+
+	pr_debug ("In ohci_hcd_lh7a404_drv_probe");
+
+	if (usb_disabled())
+		return -ENODEV;
+
+	ret = usb_hcd_lh7a404_probe(&ohci_lh7a404_hc_driver, &hcd, pdev);
+
+	if (ret == 0)
+		dev_set_drvdata(dev, hcd);
+
+	return ret;
+}
+
+static int ohci_hcd_lh7a404_drv_remove(struct device *dev)
+{
+	struct platform_device *pdev = to_platform_device(dev);
+	struct usb_hcd *hcd = dev_get_drvdata(dev);
+
+	usb_hcd_lh7a404_remove(hcd, pdev);
+	dev_set_drvdata(dev, NULL);
+	return 0;
+}
+	/*TBD*/
+/*static int ohci_hcd_lh7a404_drv_suspend(struct device *dev)
+{
+	struct platform_device *pdev = to_platform_device(dev);
+	struct usb_hcd *hcd = dev_get_drvdata(dev);
+
+	return 0;
+}
+static int ohci_hcd_lh7a404_drv_resume(struct device *dev)
+{
+	struct platform_device *pdev = to_platform_device(dev);
+	struct usb_hcd *hcd = dev_get_drvdata(dev);
+
+
+	return 0;
+}
+*/
+
+static struct device_driver ohci_hcd_lh7a404_driver = {
+	.name		= "lh7a404-ohci",
+	.bus		= &platform_bus_type,
+	.probe		= ohci_hcd_lh7a404_drv_probe,
+	.remove		= ohci_hcd_lh7a404_drv_remove,
+	/*.suspend	= ohci_hcd_lh7a404_drv_suspend, */
+	/*.resume	= ohci_hcd_lh7a404_drv_resume, */
+};
+
+static int __init ohci_hcd_lh7a404_init (void)
+{
+	pr_debug (DRIVER_INFO " (LH7A404)");
+	pr_debug ("block sizes: ed %d td %d\n",
+		sizeof (struct ed), sizeof (struct td));
+
+	return driver_register(&ohci_hcd_lh7a404_driver);
+}
+
+static void __exit ohci_hcd_lh7a404_cleanup (void)
+{
+	driver_unregister(&ohci_hcd_lh7a404_driver);
+}
+
+module_init (ohci_hcd_lh7a404_init);
+module_exit (ohci_hcd_lh7a404_cleanup);