atmel_usba_udc: Add support for AT91CAP9 UDPHS

This patch is part of the series adding support for the USB High
Speed Device Port on the AT91CAP9 system on chip. The AT91CAP9
uses the same UDPHS IP as the AVR32 and the AT91SAM9RL.

The only differences between the AVR32 and the AT91 version of the
device are in the enable/disable and suspend/wakeup sequences: the
AT91 version needs to toggle the USB bias and pulldown explicitly.

Signed-off-by: Stelian Pop <stelian@popies.net>
Acked-by: Andrew Victor <linux@maxim.org.za>
Acked-by: David Brownell <dbrownell@users.sourceforge.net>
Signed-off-by: Haavard Skinnemoen <haavard.skinnemoen@atmel.com>

3 files changed, 46 insertions, 8 deletions

diff --git a/drivers/usb/gadget/Kconfig b/drivers/usb/gadget/Kconfig
index 6f45dd669b33..d681bb27fa58 100644
--- a/drivers/usb/gadget/Kconfig
+++ b/drivers/usb/gadget/Kconfig
@@ -118,10 +118,10 @@ config USB_AMD5536UDC
 config USB_GADGET_ATMEL_USBA
 	boolean "Atmel USBA"
 	select USB_GADGET_DUALSPEED
-	depends on AVR32
+	depends on AVR32 || ARCH_AT91CAP9
 	help
 	  USBA is the integrated high-speed USB Device controller on
-	  the AT32AP700x processors from Atmel.
+	  the AT32AP700x and AT91CAP9 processors from Atmel.
 
 config USB_ATMEL_USBA
 	tristate
diff --git a/drivers/usb/gadget/atmel_usba_udc.c b/drivers/usb/gadget/atmel_usba_udc.c
index ddb7301a0138..c9a3c2a462c4 100644
--- a/drivers/usb/gadget/atmel_usba_udc.c
+++ b/drivers/usb/gadget/atmel_usba_udc.c
@@ -326,6 +326,28 @@ static int vbus_is_present(struct usba_udc *udc)
 	return 1;
 }
 
+#if defined(CONFIG_AVR32)
+
+static void toggle_bias(int is_on)
+{
+}
+
+#elif defined(CONFIG_ARCH_AT91)
+
+#include <asm/arch/at91_pmc.h>
+
+static void toggle_bias(int is_on)
+{
+	unsigned int uckr = at91_sys_read(AT91_CKGR_UCKR);
+
+	if (is_on)
+		at91_sys_write(AT91_CKGR_UCKR, uckr | AT91_PMC_BIASEN);
+	else
+		at91_sys_write(AT91_CKGR_UCKR, uckr & ~(AT91_PMC_BIASEN));
+}
+
+#endif /* CONFIG_ARCH_AT91 */
+
 static void next_fifo_transaction(struct usba_ep *ep, struct usba_request *req)
 {
 	unsigned int transaction_len;
@@ -1457,7 +1479,7 @@ restart:
 		DBG(DBG_HW, "Packet length: %u\n", pkt_len);
 		if (pkt_len != sizeof(crq)) {
 			pr_warning("udc: Invalid packet length %u "
-				"(expected %lu)\n", pkt_len, sizeof(crq));
+				"(expected %zu)\n", pkt_len, sizeof(crq));
 			set_protocol_stall(udc, ep);
 			return;
 		}
@@ -1615,6 +1637,7 @@ static irqreturn_t usba_udc_irq(int irq, void *devid)
 	DBG(DBG_INT, "irq, status=%#08x\n", status);
 
 	if (status & USBA_DET_SUSPEND) {
+		toggle_bias(0);
 		usba_writel(udc, INT_CLR, USBA_DET_SUSPEND);
 		DBG(DBG_BUS, "Suspend detected\n");
 		if (udc->gadget.speed != USB_SPEED_UNKNOWN
@@ -1626,6 +1649,7 @@ static irqreturn_t usba_udc_irq(int irq, void *devid)
 	}
 
 	if (status & USBA_WAKE_UP) {
+		toggle_bias(1);
 		usba_writel(udc, INT_CLR, USBA_WAKE_UP);
 		DBG(DBG_BUS, "Wake Up CPU detected\n");
 	}
@@ -1719,12 +1743,14 @@ static irqreturn_t usba_vbus_irq(int irq, void *devid)
 	vbus = gpio_get_value(udc->vbus_pin);
 	if (vbus != udc->vbus_prev) {
 		if (vbus) {
-			usba_writel(udc, CTRL, USBA_EN_USBA);
+			toggle_bias(1);
+			usba_writel(udc, CTRL, USBA_ENABLE_MASK);
 			usba_writel(udc, INT_ENB, USBA_END_OF_RESET);
 		} else {
 			udc->gadget.speed = USB_SPEED_UNKNOWN;
 			reset_all_endpoints(udc);
-			usba_writel(udc, CTRL, 0);
+			toggle_bias(0);
+			usba_writel(udc, CTRL, USBA_DISABLE_MASK);
 			spin_unlock(&udc->lock);
 			udc->driver->disconnect(&udc->gadget);
 			spin_lock(&udc->lock);
@@ -1777,7 +1803,8 @@ int usb_gadget_register_driver(struct usb_gadget_driver *driver)
 	/* If Vbus is present, enable the controller and wait for reset */
 	spin_lock_irqsave(&udc->lock, flags);
 	if (vbus_is_present(udc) && udc->vbus_prev == 0) {
-		usba_writel(udc, CTRL, USBA_EN_USBA);
+		toggle_bias(1);
+		usba_writel(udc, CTRL, USBA_ENABLE_MASK);
 		usba_writel(udc, INT_ENB, USBA_END_OF_RESET);
 	}
 	spin_unlock_irqrestore(&udc->lock, flags);
@@ -1810,7 +1837,8 @@ int usb_gadget_unregister_driver(struct usb_gadget_driver *driver)
 	spin_unlock_irqrestore(&udc->lock, flags);
 
 	/* This will also disable the DP pullup */
-	usba_writel(udc, CTRL, 0);
+	toggle_bias(0);
+	usba_writel(udc, CTRL, USBA_DISABLE_MASK);
 
 	driver->unbind(&udc->gadget);
 	udc->gadget.dev.driver = NULL;
@@ -1880,7 +1908,8 @@ static int __init usba_udc_probe(struct platform_device *pdev)
 
 	/* Make sure we start from a clean slate */
 	clk_enable(pclk);
-	usba_writel(udc, CTRL, 0);
+	toggle_bias(0);
+	usba_writel(udc, CTRL, USBA_DISABLE_MASK);
 	clk_disable(pclk);
 
 	usba_ep = kmalloc(sizeof(struct usba_ep) * pdata->num_ep,
diff --git a/drivers/usb/gadget/atmel_usba_udc.h b/drivers/usb/gadget/atmel_usba_udc.h
index 08bf6f9aaf7e..f7baea307f0d 100644
--- a/drivers/usb/gadget/atmel_usba_udc.h
+++ b/drivers/usb/gadget/atmel_usba_udc.h
@@ -41,6 +41,15 @@
 #define USBA_EN_USBA				(1 <<  8)
 #define USBA_DETACH				(1 <<  9)
 #define USBA_REMOTE_WAKE_UP			(1 << 10)
+#define USBA_PULLD_DIS				(1 << 11)
+
+#if defined(CONFIG_AVR32)
+#define USBA_ENABLE_MASK			USBA_EN_USBA
+#define USBA_DISABLE_MASK			0
+#elif defined(CONFIG_ARCH_AT91)
+#define USBA_ENABLE_MASK			(USBA_EN_USBA | USBA_PULLD_DIS)
+#define USBA_DISABLE_MASK			USBA_DETACH
+#endif /* CONFIG_ARCH_AT91 */
 
 /* Bitfields in FNUM */
 #define USBA_MICRO_FRAME_NUM_OFFSET		0