[adm5120] more USB driver fixes [http://openwrt.pastebin.ca/768610 bootlog :)]

git-svn-id: svn://svn.openwrt.org/openwrt/trunk@9530 3c298f89-4303-0410-b956-a3cf2f4a3e73

6 files changed, 223 insertions, 156 deletions

diff --git a/target/linux/adm5120/files/drivers/usb/host/adm5120-dbg.c b/target/linux/adm5120/files/drivers/usb/host/adm5120-dbg.c
index 7a0c73cc5..26d0b219d 100644
--- a/target/linux/adm5120/files/drivers/usb/host/adm5120-dbg.c
+++ b/target/linux/adm5120/files/drivers/usb/host/adm5120-dbg.c
@@ -243,7 +243,7 @@ admhc_dump_roothub(
 {
 	u32			temp, i;
 
-	temp = admhc_get_rhdesc(ahcd);
+	temp = admhc_read_rhdesc(ahcd);
 	if (temp == ~(u32)0)
 		return;
 
@@ -267,7 +267,7 @@ admhc_dump_roothub(
 	}
 
 	for (i = 0; i < ahcd->num_ports; i++) {
-		temp = admhc_get_portstatus(ahcd, i);
+		temp = admhc_read_portstatus(ahcd, i);
 		dbg_port_sw(ahcd, i, temp, next, size);
 	}
 }
diff --git a/target/linux/adm5120/files/drivers/usb/host/adm5120-drv.c b/target/linux/adm5120/files/drivers/usb/host/adm5120-drv.c
index 60f955279..67c771ca4 100644
--- a/target/linux/adm5120/files/drivers/usb/host/adm5120-drv.c
+++ b/target/linux/adm5120/files/drivers/usb/host/adm5120-drv.c
@@ -22,7 +22,7 @@
 #include <linux/signal.h>
 
 #include <asm/bootinfo.h>
-#include <asm/mach-adm5120/adm5120_defs.h>
+#include <adm5120_defs.h>
 
 #ifdef DEBUG
 #define HCD_DBG(f, a...)	printk(KERN_DEBUG "%s: " f, hcd_name, ## a)
diff --git a/target/linux/adm5120/files/drivers/usb/host/adm5120-hcd.c b/target/linux/adm5120/files/drivers/usb/host/adm5120-hcd.c
index 4dfd1f4fe..14fd0f96f 100644
--- a/target/linux/adm5120/files/drivers/usb/host/adm5120-hcd.c
+++ b/target/linux/adm5120/files/drivers/usb/host/adm5120-hcd.c
@@ -45,13 +45,14 @@
 #include "../core/hcd.h"
 #include "../core/hub.h"
 
-#define DRIVER_VERSION	"v0.03"
+#define DRIVER_VERSION	"v0.04"
 #define DRIVER_AUTHOR	"Gabor Juhos <juhosg at openwrt.org>"
 #define DRIVER_DESC	"ADMtek USB 1.1 Host Controller Driver"
 
 /*-------------------------------------------------------------------------*/
 
 #define ADMHC_VERBOSE_DEBUG	/* not always helpful */
+#define ADMHC_POLL_RH
 #undef ADMHC_LOCK_DMA
 
 /* For initializing controller (mask in an HCFS mode too) */
@@ -349,7 +350,7 @@ static int admhc_get_frame_number(struct usb_hcd *hcd)
 static void admhc_usb_reset(struct admhcd *ahcd)
 {
 	ahcd->host_control = ADMHC_BUSS_RESET;
-	admhc_writel(ahcd, ahcd->host_control ,&ahcd->regs->host_control);
+	admhc_writel(ahcd, ahcd->host_control, &ahcd->regs->host_control);
 }
 
 /* admhc_shutdown forcibly disables IRQs and DMA, helping kexec and
@@ -466,7 +467,7 @@ static int admhc_init(struct admhcd *ahcd)
 
 	/* Read the number of ports unless overridden */
 	if (ahcd->num_ports == 0)
-		ahcd->num_ports = admhc_get_rhdesc(ahcd) & ADMHC_RH_NUMP;
+		ahcd->num_ports = admhc_read_rhdesc(ahcd) & ADMHC_RH_NUMP;
 
 	ret = admhc_mem_init(ahcd);
 	if (ret)
@@ -531,18 +532,16 @@ static int admhc_run(struct admhcd *ahcd)
 	admhc_writel(ahcd, ahcd->host_control, &ahcd->regs->host_control);
 
 	msleep(temp);
-	temp = admhc_get_rhdesc(ahcd);
+	temp = admhc_read_rhdesc(ahcd);
 	if (!(temp & ADMHC_RH_NPS)) {
 		/* power down each port */
 		for (temp = 0; temp < ahcd->num_ports; temp++)
-			admhc_writel(ahcd, ADMHC_PS_CPP,
-				&ahcd->regs->portstatus[temp]);
+			admhc_write_portstatus(ahcd, temp, ADMHC_PS_CPP);
 	}
 
 	/* 2msec timelimit here means no irqs/preempt */
 	spin_lock_irq(&ahcd->lock);
 
-retry:
 	admhc_writel(ahcd, ADMHC_CTRL_SR,  &ahcd->regs->gencontrol);
 	temp = 30;	/* ... allow extra time */
 	while ((admhc_readl(ahcd, &ahcd->regs->gencontrol) & ADMHC_CTRL_SR) != 0) {
@@ -615,25 +614,23 @@ static irqreturn_t admhc_irq(struct usb_hcd *hcd)
  	u32 ints;
 
 	ints = admhc_readl(ahcd, &regs->int_status);
-	if ((ints & ADMHC_INTR_INTA) == 0) {
+	if (!(ints & ADMHC_INTR_INTA))
 		/* no unmasked interrupt status is set */
 		return IRQ_NONE;
-	}
 
 	ints &= admhc_readl(ahcd, &regs->int_enable);
+	if (!ints)
+		return IRQ_NONE;
 
 	if (ints & ADMHC_INTR_FATI) {
-		/* e.g. due to PCI Master/Target Abort */
 		admhc_disable(ahcd);
 		admhc_err(ahcd, "Fatal Error, controller disabled\n");
-		admhc_dump(ahcd, 1);
 		admhc_usb_reset(ahcd);
 	}
 
 	if (ints & ADMHC_INTR_BABI) {
-		admhc_intr_disable(ahcd, ADMHC_INTR_MIE);
-		admhc_err(ahcd, "Babble Detected\n");
 		admhc_disable(ahcd);
+		admhc_err(ahcd, "Babble Detected\n");
 		admhc_usb_reset(ahcd);
 	}
 
@@ -711,7 +708,7 @@ static void admhc_stop(struct usb_hcd *hcd)
 	flush_scheduled_work();
 
 	admhc_usb_reset(ahcd);
-	admhc_intr_disable(ahcd, ADMHC_INTR_MIE);
+	admhc_intr_disable(ahcd, ~0);
 
 	free_irq(hcd->irq, hcd);
 	hcd->irq = -1;
diff --git a/target/linux/adm5120/files/drivers/usb/host/adm5120-hub.c b/target/linux/adm5120/files/drivers/usb/host/adm5120-hub.c
index 48e61e988..f8bda82e0 100644
--- a/target/linux/adm5120/files/drivers/usb/host/adm5120-hub.c
+++ b/target/linux/adm5120/files/drivers/usb/host/adm5120-hub.c
@@ -17,42 +17,42 @@
 	admhc_dbg(hc, \
 		"%s port%d " \
 		"= 0x%08x%s%s%s%s%s%s%s%s%s%s%s%s\n", \
-		label, num, temp, \
-		(temp & ADMHC_PS_PRSC) ? " PRSC" : "", \
-		(temp & ADMHC_PS_OCIC) ? " OCIC" : "", \
-		(temp & ADMHC_PS_PSSC) ? " PSSC" : "", \
-		(temp & ADMHC_PS_PESC) ? " PESC" : "", \
-		(temp & ADMHC_PS_CSC) ? " CSC" : "", \
+		label, num, value, \
+		(value & ADMHC_PS_PRSC) ? " PRSC" : "", \
+		(value & ADMHC_PS_OCIC) ? " OCIC" : "", \
+		(value & ADMHC_PS_PSSC) ? " PSSC" : "", \
+		(value & ADMHC_PS_PESC) ? " PESC" : "", \
+		(value & ADMHC_PS_CSC) ? " CSC" : "", \
 		\
-		(temp & ADMHC_PS_LSDA) ? " LSDA" : "", \
-		(temp & ADMHC_PS_PPS) ? " PPS" : "", \
-		(temp & ADMHC_PS_PRS) ? " PRS" : "", \
-		(temp & ADMHC_PS_POCI) ? " POCI" : "", \
-		(temp & ADMHC_PS_PSS) ? " PSS" : "", \
+		(value & ADMHC_PS_LSDA) ? " LSDA" : "", \
+		(value & ADMHC_PS_PPS) ? " PPS" : "", \
+		(value & ADMHC_PS_PRS) ? " PRS" : "", \
+		(value & ADMHC_PS_POCI) ? " POCI" : "", \
+		(value & ADMHC_PS_PSS) ? " PSS" : "", \
 		\
-		(temp & ADMHC_PS_PES) ? " PES" : "", \
-		(temp & ADMHC_PS_CCS) ? " CCS" : "" \
+		(value & ADMHC_PS_PES) ? " PES" : "", \
+		(value & ADMHC_PS_CCS) ? " CCS" : "" \
 		);
 
 #define dbg_port_write(hc,label,num,value) \
 	admhc_dbg(hc, \
 		"%s port%d " \
 		"= 0x%08x%s%s%s%s%s%s%s%s%s%s%s%s\n", \
-		label, num, temp, \
-		(temp & ADMHC_PS_PRSC) ? " PRSC" : "", \
-		(temp & ADMHC_PS_OCIC) ? " OCIC" : "", \
-		(temp & ADMHC_PS_PSSC) ? " PSSC" : "", \
-		(temp & ADMHC_PS_PESC) ? " PESC" : "", \
-		(temp & ADMHC_PS_CSC) ? " CSC" : "", \
+		label, num, value, \
+		(value & ADMHC_PS_PRSC) ? " PRSC" : "", \
+		(value & ADMHC_PS_OCIC) ? " OCIC" : "", \
+		(value & ADMHC_PS_PSSC) ? " PSSC" : "", \
+		(value & ADMHC_PS_PESC) ? " PESC" : "", \
+		(value & ADMHC_PS_CSC) ? " CSC" : "", \
 		\
-		(temp & ADMHC_PS_CPP) ? " CPP" : "", \
-		(temp & ADMHC_PS_SPP) ? " SPP" : "", \
-		(temp & ADMHC_PS_SPR) ? " SPR" : "", \
-		(temp & ADMHC_PS_CPS) ? " CPS" : "", \
-		(temp & ADMHC_PS_SPS) ? " SPS" : "", \
+		(value & ADMHC_PS_CPP) ? " CPP" : "", \
+		(value & ADMHC_PS_SPP) ? " SPP" : "", \
+		(value & ADMHC_PS_SPR) ? " SPR" : "", \
+		(value & ADMHC_PS_CPS) ? " CPS" : "", \
+		(value & ADMHC_PS_SPS) ? " SPS" : "", \
 		\
-		(temp & ADMHC_PS_SPE) ? " SPE" : "", \
-		(temp & ADMHC_PS_CPE) ? " CPE" : "" \
+		(value & ADMHC_PS_SPE) ? " SPE" : "", \
+		(value & ADMHC_PS_CPE) ? " CPE" : "" \
 		);
 
 /*-------------------------------------------------------------------------*/
@@ -87,7 +87,7 @@ admhc_hub_status_data(struct usb_hcd *hcd, char *buf)
 		goto done;
 
 	/* init status */
-	status = admhc_get_rhdesc(ahcd);
+	status = admhc_read_rhdesc(ahcd);
 	if (status & (ADMHC_RH_LPSC | ADMHC_RH_OCIC))
 		buf [0] = changed = 1;
 	else
@@ -99,7 +99,7 @@ admhc_hub_status_data(struct usb_hcd *hcd, char *buf)
 
 	/* look at each port */
 	for (i = 0; i < ahcd->num_ports; i++) {
-		status = admhc_get_portstatus(ahcd, i);
+		status = admhc_read_portstatus(ahcd, i);
 
 		/* can't autostop if ports are connected */
 		any_connected |= (status & ADMHC_PS_CCS);
@@ -125,15 +125,15 @@ done:
 
 /*-------------------------------------------------------------------------*/
 
-static void admhc_hub_descriptor(struct admhcd *ahcd,
-		struct usb_hub_descriptor *desc)
+static int admhc_get_hub_descriptor(struct admhcd *ahcd, char *buf)
 {
-	u32		rh = admhc_get_rhdesc(ahcd);
-	u16		temp;
+	struct usb_hub_descriptor *desc = (struct usb_hub_descriptor *)buf;
+	u32 rh = admhc_read_rhdesc(ahcd);
+	u16 temp;
 
 	desc->bDescriptorType = USB_DT_HUB;	/* Hub-descriptor */
 	desc->bPwrOn2PwrGood = ADMHC_POTPGT/2;	/* use default value */
-	desc->bHubContrCurrent = 0x00;	/* 0mA */
+	desc->bHubContrCurrent = 0x00;		/* 0mA */
 
 	desc->bNbrPorts = ahcd->num_ports;
 	temp = 1 + (ahcd->num_ports / 8);
@@ -152,8 +152,58 @@ static void admhc_hub_descriptor(struct admhcd *ahcd,
 	desc->wHubCharacteristics = (__force __u16)cpu_to_hc16(ahcd, temp);
 
 	/* two bitmaps:  ports removable, and usb 1.0 legacy PortPwrCtrlMask */
-	desc->bitmap [0] = 0;
-	desc->bitmap [0] = ~0;
+	desc->bitmap[0] = 0;
+	desc->bitmap[0] = ~0;
+
+	return 0;
+}
+
+static int admhc_get_hub_status(struct admhcd *ahcd, char *buf)
+{
+	struct usb_hub_status *hs = (struct usb_hub_status *)buf;
+	u32 t = admhc_read_rhdesc(ahcd);
+	u16 status, change;
+
+	status = 0;
+	status |= (t & ADMHC_RH_LPS) ? HUB_STATUS_LOCAL_POWER : 0;
+	status |= (t & ADMHC_RH_OCI) ? HUB_STATUS_OVERCURRENT : 0;
+
+	change = 0;
+	change |= (t & ADMHC_RH_LPSC) ? HUB_CHANGE_LOCAL_POWER : 0;
+	change |= (t & ADMHC_RH_OCIC) ? HUB_CHANGE_OVERCURRENT : 0;
+
+	hs->wHubStatus = (__force __u16)cpu_to_hc16(ahcd, status);
+	hs->wHubChange = (__force __u16)cpu_to_hc16(ahcd, change);
+
+	return 0;
+}
+
+static int admhc_get_port_status(struct admhcd *ahcd, unsigned port, char *buf)
+{
+	struct usb_port_status *ps = (struct usb_port_status *)buf;
+	u32 t = admhc_read_portstatus(ahcd, port);
+	u16 status, change;
+
+	status = 0;
+	status |= (t & ADMHC_PS_CCS) ? USB_PORT_STAT_CONNECTION : 0;
+	status |= (t & ADMHC_PS_PES) ? USB_PORT_STAT_ENABLE : 0;
+	status |= (t & ADMHC_PS_PSS) ? USB_PORT_STAT_SUSPEND : 0;
+	status |= (t & ADMHC_PS_POCI) ? USB_PORT_STAT_OVERCURRENT : 0;
+	status |= (t & ADMHC_PS_PRS) ? USB_PORT_STAT_RESET : 0;
+	status |= (t & ADMHC_PS_PPS) ? USB_PORT_STAT_POWER : 0;
+	status |= (t & ADMHC_PS_LSDA) ? USB_PORT_STAT_LOW_SPEED : 0;
+
+	change = 0;
+	change |= (t & ADMHC_PS_CSC) ? USB_PORT_STAT_C_CONNECTION : 0;
+	change |= (t & ADMHC_PS_PESC) ? USB_PORT_STAT_C_ENABLE : 0;
+	change |= (t & ADMHC_PS_PSSC) ? USB_PORT_STAT_C_SUSPEND : 0;
+	change |= (t & ADMHC_PS_OCIC) ? USB_PORT_STAT_C_OVERCURRENT : 0;
+	change |= (t & ADMHC_PS_PRSC) ? USB_PORT_STAT_C_RESET : 0;
+
+	ps->wPortStatus = (__force __u16)cpu_to_hc16(ahcd, status);
+	ps->wPortChange = (__force __u16)cpu_to_hc16(ahcd, change);
+
+	return 0;
 }
 
 /*-------------------------------------------------------------------------*/
@@ -170,12 +220,12 @@ static int admhc_start_port_reset(struct usb_hcd *hcd, unsigned port)
 	port--;
 
 	/* start port reset before HNP protocol times out */
-	status = admhc_readl(ahcd, &ahcd->regs->portstatus[port]);
+	status = admhc_read_portstatus(ahcd, port);
 	if (!(status & ADMHC_PS_CCS))
 		return -ENODEV;
 
 	/* khubd will finish the reset later */
-	admhc_writel(ahcd, ADMHC_PS_PRS, &ahcd->regs->portstatus[port]);
+	admhc_write_portstatus(ahcd, port, ADMHC_PS_PRS);
 	return 0;
 }
 
@@ -208,91 +258,107 @@ static void start_hnp(struct admhcd *ahcd);
 #define tick_before(t1,t2) ((s16)(((s16)(t1))-((s16)(t2))) < 0)
 
 /* called from some task, normally khubd */
-static inline int root_port_reset(struct admhcd *ahcd, unsigned port)
+static inline int admhc_port_reset(struct admhcd *ahcd, unsigned port)
 {
-#if 0
-	/* FIXME: revert to this when frame numbers are updated */
-	__hc32 __iomem *portstat = &ahcd->regs->portstatus[port];
-	u32	temp;
-	u16	now = admhc_readl(ahcd, &ahcd->regs->fmnumber);
-	u16	reset_done = now + PORT_RESET_MSEC;
-
-	/* build a "continuous enough" reset signal, with up to
-	 * 3msec gap between pulses.  scheduler HZ==100 must work;
-	 * this might need to be deadline-scheduled.
-	 */
+	u32 t;
+	int c;
+
+	admhc_vdbg(ahcd, "reset port%d\n", port);
+
+	t = admhc_read_portstatus(ahcd, port);
+	if (!(t & ADMHC_PS_CCS))
+		return -ENODEV;
+
+	if ((t & ADMHC_PS_PRS))
+		return 0;
+
+	admhc_write_portstatus(ahcd, port, ADMHC_PS_PRS);
+	c = 0;
 	do {
-		/* spin until any current reset finishes */
-		for (;;) {
-			temp = admhc_readl(ahcd, portstat);
-			/* handle e.g. CardBus eject */
-			if (temp == ~(u32)0)
-				return -ESHUTDOWN;
-			if (!(temp & ADMHC_PS_PRS))
-				break;
-			udelay (500);
+		t = admhc_read_portstatus(ahcd, port);
+		if (t & ADMHC_PS_PRSC)
+			break;
+
+		if (++c > 20) {
+			admhc_err(ahcd, "port%d reset timed out\n",port);
+			return -EPIPE;
 		}
 
-		if (!(temp & ADMHC_PS_CCS))
-			break;
-		if (temp & ADMHC_PS_PRSC)
-			admhc_writel(ahcd, ADMHC_PS_PRSC, portstat);
-
-		/* start the next reset, sleep till it's probably done */
-		admhc_writel(ahcd, ADMHC_PS_PRS, portstat);
-		msleep(PORT_RESET_HW_MSEC);
-		now = admhc_readl(ahcd, &ahcd->regs->fmnumber);
-	} while (tick_before(now, reset_done));
-	/* caller synchronizes using PRSC */
-#else
-	__hc32 __iomem *portstat = &ahcd->regs->portstatus[port];
-	u32	temp;
-	unsigned long	reset_done = jiffies + msecs_to_jiffies(PORT_RESET_MSEC);
-
-	/* build a "continuous enough" reset signal, with up to
-	 * 3msec gap between pulses.  scheduler HZ==100 must work;
-	 * this might need to be deadline-scheduled.
-	 */
+		mdelay(PORT_RESET_HW_MSEC);
+	} while (1);
+	admhc_vdbg(ahcd, "port%d reset completed within %dms\n", port,
+			c * PORT_RESET_HW_MSEC);
+
+	t = admhc_read_portstatus(ahcd, port);
+	if (!(t & ADMHC_PS_CCS)) {
+		admhc_err(ahcd, "port%d is not connected after reset\n",port);
+		return -ENODEV;
+	}
+
+	admhc_write_portstatus(ahcd, port, ADMHC_PS_SPE);
+	c = 0;
 	do {
-		/* spin until any current reset finishes */
-		for (;;) {
-			temp = admhc_readl(ahcd, portstat);
-			/* handle e.g. CardBus eject */
-			if (temp == ~(u32)0)
-				return -ESHUTDOWN;
-			if (!(temp & ADMHC_PS_PRS))
-				break;
-			udelay (500);
+		t = admhc_read_portstatus(ahcd, port);
+		if (t & ADMHC_PS_PESC)
+			break;
+
+		if (++c > 20) {
+			admhc_err(ahcd, "port%d enable timed out\n",port);
+			return -EPIPE;
 		}
 
-		if (!(temp & ADMHC_PS_CCS))
-			break;
+		mdelay(PORT_RESET_HW_MSEC);
+	} while (1);
+	admhc_vdbg(ahcd, "port%d enable completed within %dms\n", port,
+			c * PORT_RESET_HW_MSEC);
 
-		if (temp & ADMHC_PS_PRSC)
-			admhc_writel(ahcd, ADMHC_PS_PRSC, portstat);
+	admhc_write_portstatus(ahcd, port, ADMHC_PS_CSC);
+
+	return 0;
+}
 
-		/* start the next reset, sleep till it's probably done */
-		admhc_writel(ahcd, ADMHC_PS_PRS, portstat);
-		msleep(PORT_RESET_HW_MSEC);
-	} while (time_before(jiffies, reset_done));
+static inline int admhc_port_enable(struct admhcd *ahcd, unsigned port)
+{
+	u32 t;
+
+	admhc_vdbg(ahcd, "enable port%d\n", port);
+	t = admhc_read_portstatus(ahcd, port);
+	if (!(t & ADMHC_PS_CCS))
+		return -ENODEV;
+
+	admhc_write_portstatus(ahcd, port, ADMHC_PS_SPE);
 
-	admhc_writel(ahcd, ADMHC_PS_SPE | ADMHC_PS_CSC, portstat);
-	msleep(100);
-#endif
 	return 0;
 }
 
-static int admhc_hub_control (
-	struct usb_hcd	*hcd,
-	u16		typeReq,
-	u16		wValue,
-	u16		wIndex,
-	char		*buf,
-	u16		wLength
-) {
+static inline int admhc_port_disable(struct admhcd *ahcd, unsigned port)
+{
+	u32 t;
+
+	admhc_vdbg(ahcd, "disable port%d\n", port);
+	t = admhc_read_portstatus(ahcd, port);
+	if (!(t & ADMHC_PS_CCS))
+		return -ENODEV;
+
+	admhc_write_portstatus(ahcd, ADMHC_PS_CPE, port);
+
+	return 0;
+}
+
+static inline int admhc_port_write(struct admhcd *ahcd, unsigned port,
+		u32 val)
+{
+	dbg_port_write(ahcd, "write", port, val);
+	admhc_write_portstatus(ahcd, port, val);
+
+	return 0;
+}
+
+static int admhc_hub_control(struct usb_hcd *hcd, u16 typeReq, u16 wValue,
+		u16 wIndex, char *buf, u16 wLength)
+{
 	struct admhcd	*ahcd = hcd_to_admhcd(hcd);
-	int		ports = hcd_to_bus (hcd)->root_hub->maxchild;
-	u32		temp;
+	int		ports = hcd_to_bus(hcd)->root_hub->maxchild;
 	int		ret = 0;
 
 	if (unlikely(!test_bit(HCD_FLAG_HW_ACCESSIBLE, &hcd->flags)))
@@ -319,55 +385,50 @@ static int admhc_hub_control (
 
 		switch (wValue) {
 		case USB_PORT_FEAT_ENABLE:
-			temp = ADMHC_PS_CPE;
+			ret = admhc_port_disable(ahcd, wIndex);
 			break;
 		case USB_PORT_FEAT_SUSPEND:
-			temp = ADMHC_PS_CPS;
+			ret = admhc_port_write(ahcd, wIndex, ADMHC_PS_CPS);
 			break;
 		case USB_PORT_FEAT_POWER:
-			temp = ADMHC_PS_CPP;
+			ret = admhc_port_write(ahcd, wIndex, ADMHC_PS_CPP);
 			break;
 		case USB_PORT_FEAT_C_CONNECTION:
-			temp = ADMHC_PS_CSC;
+			ret = admhc_port_write(ahcd, wIndex, ADMHC_PS_CSC);
 			break;
 		case USB_PORT_FEAT_C_ENABLE:
-			temp = ADMHC_PS_PESC;
+			ret = admhc_port_write(ahcd, wIndex, ADMHC_PS_PESC);
 			break;
 		case USB_PORT_FEAT_C_SUSPEND:
-			temp = ADMHC_PS_PSSC;
+			ret = admhc_port_write(ahcd, wIndex, ADMHC_PS_PSSC);
 			break;
 		case USB_PORT_FEAT_C_OVER_CURRENT:
-			temp = ADMHC_PS_OCIC;
+			ret = admhc_port_write(ahcd, wIndex, ADMHC_PS_OCIC);
 			break;
 		case USB_PORT_FEAT_C_RESET:
-			temp = ADMHC_PS_PRSC;
+			ret = admhc_port_write(ahcd, wIndex, ADMHC_PS_PRSC);
 			break;
 		default:
 			goto error;
 		}
-		admhc_writel(ahcd, temp, &ahcd->regs->portstatus[wIndex]);
 		break;
 	case GetHubDescriptor:
-		admhc_hub_descriptor(ahcd, (struct usb_hub_descriptor *) buf);
+		ret = admhc_get_hub_descriptor(ahcd, buf);
 		break;
 	case GetHubStatus:
-		temp = admhc_get_rhdesc(ahcd);
-		temp &= ~(ADMHC_RH_CRWE | ADMHC_RH_DRWE);
-		put_unaligned(cpu_to_le32 (temp), (__le32 *) buf);
+		ret = admhc_get_hub_status(ahcd, buf);
 		break;
 	case GetPortStatus:
 		if (!wIndex || wIndex > ports)
 			goto error;
 		wIndex--;
-		temp = admhc_get_portstatus(ahcd, wIndex);
-		put_unaligned(cpu_to_le32 (temp), (__le32 *) buf);
 
-		dbg_port(ahcd, "GetPortStatus", wIndex, temp);
+		ret = admhc_get_port_status(ahcd, wIndex, buf);
 		break;
 	case SetHubFeature:
 		switch (wValue) {
 		case C_HUB_OVER_CURRENT:
-			// FIXME:  this can be cleared, yes?
+			/* FIXME:  this can be cleared, yes? */
 		case C_HUB_LOCAL_POWER:
 			break;
 		default:
@@ -381,8 +442,10 @@ static int admhc_hub_control (
 
 		switch (wValue) {
 		case USB_PORT_FEAT_ENABLE:
-			admhc_writel(ahcd, ADMHC_PS_SPE,
-				&ahcd->regs->portstatus[wIndex]);
+			ret = admhc_port_enable(ahcd, wIndex);
+			break;
+		case USB_PORT_FEAT_RESET:
+			ret = admhc_port_reset(ahcd, wIndex);
 			break;
 		case USB_PORT_FEAT_SUSPEND:
 #ifdef	CONFIG_USB_OTG
@@ -391,15 +454,10 @@ static int admhc_hub_control (
 				start_hnp(ahcd);
 			else
 #endif
-			admhc_writel(ahcd, ADMHC_PS_SPS,
-				&ahcd->regs->portstatus[wIndex]);
+			ret = admhc_port_write(ahcd, wIndex, ADMHC_PS_SPS);
 			break;
 		case USB_PORT_FEAT_POWER:
-			admhc_writel(ahcd, ADMHC_PS_SPP,
-				&ahcd->regs->portstatus[wIndex]);
-			break;
-		case USB_PORT_FEAT_RESET:
-			ret = root_port_reset(ahcd, wIndex);
+			ret = admhc_port_write(ahcd, wIndex, ADMHC_PS_SPP);
 			break;
 		default:
 			goto error;
@@ -411,6 +469,7 @@ error:
 		/* "protocol stall" on error */
 		ret = -EPIPE;
 	}
+
 	return ret;
 }
 
diff --git a/target/linux/adm5120/files/drivers/usb/host/adm5120-mem.c b/target/linux/adm5120/files/drivers/usb/host/adm5120-mem.c
index fdacf7c11..daf59bc43 100644
--- a/target/linux/adm5120/files/drivers/usb/host/adm5120-mem.c
+++ b/target/linux/adm5120/files/drivers/usb/host/adm5120-mem.c
@@ -147,7 +147,7 @@ static struct urb_priv *urb_priv_alloc(struct admhcd *ahcd, int num_tds,
 	if (!priv)
 		goto err;
 
-	/* allocate the TDs (deferring hash chain updates) */
+	/* allocate the TDs */
 	for (i = 0; i < num_tds; i++) {
 		priv->td[i] = td_alloc(ahcd, mem_flags);
 		if (priv->td[i] == NULL)
diff --git a/target/linux/adm5120/files/drivers/usb/host/adm5120.h b/target/linux/adm5120/files/drivers/usb/host/adm5120.h
index bdfdbc713..f8b576a4c 100644
--- a/target/linux/adm5120/files/drivers/usb/host/adm5120.h
+++ b/target/linux/adm5120/files/drivers/usb/host/adm5120.h
@@ -436,8 +436,13 @@ static inline struct usb_hcd *admhcd_to_hcd(const struct admhcd *ahcd)
 #define STUB_DEBUG_FILES
 #endif	/* DEBUG */
 
-#define admhc_dbg(ahcd, fmt, args...) \
-	printk(KERN_DEBUG "adm5120-hcd: " fmt , ## args )
+#ifdef DEBUG
+#	define admhc_dbg(ahcd, fmt, args...) \
+		printk(KERN_DEBUG "adm5120-hcd: " fmt , ## args )
+#else
+#	define admhc_dbg(ahcd, fmt, args...) do { } while (0)
+#endif
+
 #define admhc_err(ahcd, fmt, args...) \
 	printk(KERN_ERR "adm5120-hcd: " fmt , ## args )
 #define ahcd_info(ahcd, fmt, args...) \
@@ -645,16 +650,22 @@ static inline void periodic_reinit(struct admhcd *ahcd)
 					&ahcd->regs->fminterval);
 }
 
-static inline u32 admhc_get_rhdesc(struct admhcd *ahcd)
+static inline u32 admhc_read_rhdesc(struct admhcd *ahcd)
 {
 	return admhc_readl(ahcd, &ahcd->regs->rhdesc);
 }
 
-static inline u32 admhc_get_portstatus(struct admhcd *ahcd, int port)
+static inline u32 admhc_read_portstatus(struct admhcd *ahcd, int port)
 {
 	return admhc_readl(ahcd, &ahcd->regs->portstatus[port]);
 }
 
+static inline void admhc_write_portstatus(struct admhcd *ahcd, int port,
+		u32 value)
+{
+	admhc_writel(ahcd, value, &ahcd->regs->portstatus[port]);
+}
+
 static inline void roothub_write_status(struct admhcd *ahcd, u32 value)
 {
 	/* FIXME: read-only bits must be masked out */