usb: isp1760: Add device controller support

The ISP1761 is a dual-mode host and device controller backward
compatible on the host side with the ISP1760. Add support for the device
controller.

Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Signed-off-by: Felipe Balbi <balbi@ti.com>

drivers/usb/gadget/udc/Kconfig

@@ -109,6 +109,13 @@ config USB_GR_UDC
           Select this to support Aeroflex Gaisler GRUSBDC cores from the GRLIB
 	  VHDL IP core library.
 
+config USB_ISP1761_UDC
+	boolean "NXP ISP1761 USB Device Controller"
+	depends on USB_ISP1760_HCD
+	help
+	   The NXP ISP1761 is a dual-role high-speed USB host and device
+	   controller.
+
 config USB_OMAP
 	tristate "OMAP USB Device Controller"
 	depends on ARCH_OMAP1

drivers/usb/host/Makefile

@@ -6,6 +6,7 @@
 CFLAGS_xhci-trace.o := -I$(src)
 
 isp1760-y := isp1760-core.o isp1760-hcd.o isp1760-if.o
+isp1760-$(CONFIG_USB_ISP1761_UDC) += isp1760-udc.o
 
 fhci-y := fhci-hcd.o fhci-hub.o fhci-q.o
 fhci-y += fhci-mem.o fhci-tds.o fhci-sched.o

drivers/usb/host/isp1760-core.c

@@ -24,9 +24,11 @@
 #include "isp1760-core.h"
 #include "isp1760-hcd.h"
 #include "isp1760-regs.h"
+#include "isp1760-udc.h"
 
 static void isp1760_init_core(struct isp1760_device *isp)
 {
+	u32 otgctrl;
 	u32 hwmode;
 
 	/* Low-level chip reset */
@@ -59,6 +61,17 @@ static void isp1760_init_core(struct isp1760_device *isp)
 	if (isp->devflags & ISP1760_FLAG_INTR_EDGE_TRIG)
 		hwmode |= HW_INTR_EDGE_TRIG;
 
+	/*
+	 * The ISP1761 has a dedicated DC IRQ line but supports sharing the HC
+	 * IRQ line for both the host and device controllers. Hardcode IRQ
+	 * sharing for now and disable the DC interrupts globally to avoid
+	 * spurious interrupts during HCD registration.
+	 */
+	if (isp->devflags & ISP1760_FLAG_ISP1761) {
+		isp1760_write32(isp->regs, DC_MODE, 0);
+		hwmode |= HW_COMN_IRQ;
+	}
+
 	/*
 	 * We have to set this first in case we're in 16-bit mode.
 	 * Write it twice to ensure correct upper bits if switching
@@ -68,18 +81,33 @@ static void isp1760_init_core(struct isp1760_device *isp)
 	isp1760_write32(isp->regs, HC_HW_MODE_CTRL, hwmode);
 
 	/*
-	 * PORT 1 Control register of the ISP1760 is the OTG control register on
+	 * PORT 1 Control register of the ISP1760 is the OTG control register
-	 * ISP1761. Since there is no OTG or device controller support in this
+	 * on ISP1761.
-	 * driver, we use port 1 as a "normal" USB host port on both chips.
+	 *
+	 * TODO: Really support OTG. For now we configure port 1 in device mode
+	 * when OTG is requested.
 	 */
-	isp1760_write32(isp->regs, HC_PORT1_CTRL, PORT1_POWER | PORT1_INIT2);
+	if ((isp->devflags & ISP1760_FLAG_ISP1761) &&
-	usleep_range(10000, 11000);
+	    (isp->devflags & ISP1760_FLAG_OTG_EN))
+		otgctrl = ((HW_DM_PULLDOWN | HW_DP_PULLDOWN) << 16)
+			| HW_OTG_DISABLE;
+	else
+		otgctrl = (HW_SW_SEL_HC_DC << 16)
+			| (HW_VBUS_DRV | HW_SEL_CP_EXT);
+
+	isp1760_write32(isp->regs, HC_PORT1_CTRL, otgctrl);
 
 	dev_info(isp->dev, "bus width: %u, oc: %s\n",
 		 isp->devflags & ISP1760_FLAG_BUS_WIDTH_16 ? 16 : 32,
 		 isp->devflags & ISP1760_FLAG_ANALOG_OC ? "analog" : "digital");
 }
 
+void isp1760_set_pullup(struct isp1760_device *isp, bool enable)
+{
+	isp1760_write32(isp->regs, HW_OTG_CTRL_SET,
+			enable ? HW_DP_PULLUP : HW_DP_PULLUP << 16);
+}
+
 int isp1760_register(struct resource *mem, int irq, unsigned long irqflags,
 		     struct device *dev, unsigned int devflags)
 {
@@ -114,6 +142,15 @@ int isp1760_register(struct resource *mem, int irq, unsigned long irqflags,
 	if (ret < 0)
 		return ret;
 
+	if (devflags & ISP1760_FLAG_ISP1761) {
+		ret = isp1760_udc_register(isp, irq, irqflags | IRQF_SHARED |
+					   IRQF_DISABLED);
+		if (ret < 0) {
+			isp1760_hcd_unregister(&isp->hcd);
+			return ret;
+		}
+	}
+
 	dev_set_drvdata(dev, isp);
 
 	return 0;
@@ -123,6 +160,9 @@ void isp1760_unregister(struct device *dev)
 {
 	struct isp1760_device *isp = dev_get_drvdata(dev);
 
+	if (isp->devflags & ISP1760_FLAG_ISP1761)
+		isp1760_udc_unregister(isp);
+
 	isp1760_hcd_unregister(&isp->hcd);
 }
 

drivers/usb/host/isp1760-core.h

@@ -19,6 +19,7 @@
 #include <linux/ioport.h>
 
 #include "isp1760-hcd.h"
+#include "isp1760-udc.h"
 
 struct device;
 struct gpio_desc;
@@ -45,12 +46,15 @@ struct isp1760_device {
 	struct gpio_desc *rst_gpio;
 
 	struct isp1760_hcd hcd;
+	struct isp1760_udc udc;
 };
 
 int isp1760_register(struct resource *mem, int irq, unsigned long irqflags,
 		     struct device *dev, unsigned int devflags);
 void isp1760_unregister(struct device *dev);
 
+void isp1760_set_pullup(struct isp1760_device *isp, bool enable);
+
 static inline u32 isp1760_read32(void __iomem *base, u32 reg)
 {
 	return readl(base + reg);

drivers/usb/host/isp1760-regs.h

@@ -16,6 +16,10 @@
 #ifndef _ISP1760_REGS_H_
 #define _ISP1760_REGS_H_
 
+/* -----------------------------------------------------------------------------
+ * Host Controller
+ */
+
 /* EHCI capability registers */
 #define HC_CAPLENGTH		0x000
 #define HC_LENGTH(p)		(((p) >> 00) & 0x00ff)	/* bits 7:0 */
@@ -70,6 +74,9 @@
 #define HC_HW_MODE_CTRL		0x300
 #define ALL_ATX_RESET		(1 << 31)
 #define HW_ANA_DIGI_OC		(1 << 15)
+#define HW_DEV_DMA		(1 << 11)
+#define HW_COMN_IRQ		(1 << 10)
+#define HW_COMN_DMA		(1 << 9)
 #define HW_DATA_BUS_32BIT	(1 << 8)
 #define HW_DACK_POL_HIGH	(1 << 6)
 #define HW_DREQ_POL_HIGH	(1 << 5)
@@ -98,6 +105,17 @@
 #define PORT1_INIT2		(1 << 23)
 #define HW_OTG_CTRL_SET		0x374
 #define HW_OTG_CTRL_CLR		0x376
+#define HW_OTG_DISABLE		(1 << 10)
+#define HW_OTG_SE0_EN		(1 << 9)
+#define HW_BDIS_ACON_EN		(1 << 8)
+#define HW_SW_SEL_HC_DC		(1 << 7)
+#define HW_VBUS_CHRG		(1 << 6)
+#define HW_VBUS_DISCHRG		(1 << 5)
+#define HW_VBUS_DRV		(1 << 4)
+#define HW_SEL_CP_EXT		(1 << 3)
+#define HW_DM_PULLDOWN		(1 << 2)
+#define HW_DP_PULLDOWN		(1 << 1)
+#define HW_DP_PULLUP		(1 << 0)
 
 /* Interrupt Register */
 #define HC_INTERRUPT_REG	0x310
@@ -117,4 +135,96 @@
 #define HC_INT_IRQ_MASK_AND_REG	0x328
 #define HC_ATL_IRQ_MASK_AND_REG	0x32c
 
+/* -----------------------------------------------------------------------------
+ * Peripheral Controller
+ */
+
+/* Initialization Registers */
+#define DC_ADDRESS			0x0200
+#define DC_DEVEN			(1 << 7)
+
+#define DC_MODE				0x020c
+#define DC_DMACLKON			(1 << 9)
+#define DC_VBUSSTAT			(1 << 8)
+#define DC_CLKAON			(1 << 7)
+#define DC_SNDRSU			(1 << 6)
+#define DC_GOSUSP			(1 << 5)
+#define DC_SFRESET			(1 << 4)
+#define DC_GLINTENA			(1 << 3)
+#define DC_WKUPCS			(1 << 2)
+
+#define DC_INTCONF			0x0210
+#define DC_CDBGMOD_ACK_NAK		(0 << 6)
+#define DC_CDBGMOD_ACK			(1 << 6)
+#define DC_CDBGMOD_ACK_1NAK		(2 << 6)
+#define DC_DDBGMODIN_ACK_NAK		(0 << 4)
+#define DC_DDBGMODIN_ACK		(1 << 4)
+#define DC_DDBGMODIN_ACK_1NAK		(2 << 4)
+#define DC_DDBGMODOUT_ACK_NYET_NAK	(0 << 2)
+#define DC_DDBGMODOUT_ACK_NYET		(1 << 2)
+#define DC_DDBGMODOUT_ACK_NYET_1NAK	(2 << 2)
+#define DC_INTLVL			(1 << 1)
+#define DC_INTPOL			(1 << 0)
+
+#define DC_DEBUG			0x0212
+#define DC_INTENABLE			0x0214
+#define DC_IEPTX(n)			(1 << (11 + 2 * (n)))
+#define DC_IEPRX(n)			(1 << (10 + 2 * (n)))
+#define DC_IEPRXTX(n)			(3 << (10 + 2 * (n)))
+#define DC_IEP0SETUP			(1 << 8)
+#define DC_IEVBUS			(1 << 7)
+#define DC_IEDMA			(1 << 6)
+#define DC_IEHS_STA			(1 << 5)
+#define DC_IERESM			(1 << 4)
+#define DC_IESUSP			(1 << 3)
+#define DC_IEPSOF			(1 << 2)
+#define DC_IESOF			(1 << 1)
+#define DC_IEBRST			(1 << 0)
+
+/* Data Flow Registers */
+#define DC_EPINDEX			0x022c
+#define DC_EP0SETUP			(1 << 5)
+#define DC_ENDPIDX(n)			((n) << 1)
+#define DC_EPDIR			(1 << 0)
+
+#define DC_CTRLFUNC			0x0228
+#define DC_CLBUF			(1 << 4)
+#define DC_VENDP			(1 << 3)
+#define DC_DSEN				(1 << 2)
+#define DC_STATUS			(1 << 1)
+#define DC_STALL			(1 << 0)
+
+#define DC_DATAPORT			0x0220
+#define DC_BUFLEN			0x021c
+#define DC_DATACOUNT_MASK		0xffff
+#define DC_BUFSTAT			0x021e
+#define DC_EPMAXPKTSZ			0x0204
+
+#define DC_EPTYPE			0x0208
+#define DC_NOEMPKT			(1 << 4)
+#define DC_EPENABLE			(1 << 3)
+#define DC_DBLBUF			(1 << 2)
+#define DC_ENDPTYP_ISOC			(1 << 0)
+#define DC_ENDPTYP_BULK			(2 << 0)
+#define DC_ENDPTYP_INTERRUPT		(3 << 0)
+
+/* DMA Registers */
+#define DC_DMACMD			0x0230
+#define DC_DMATXCOUNT			0x0234
+#define DC_DMACONF			0x0238
+#define DC_DMAHW			0x023c
+#define DC_DMAINTREASON			0x0250
+#define DC_DMAINTEN			0x0254
+#define DC_DMAEP			0x0258
+#define DC_DMABURSTCOUNT		0x0264
+
+/* General Registers */
+#define DC_INTERRUPT			0x0218
+#define DC_CHIPID			0x0270
+#define DC_FRAMENUM			0x0274
+#define DC_SCRATCH			0x0278
+#define DC_UNLOCKDEV			0x027c
+#define DC_INTPULSEWIDTH		0x0280
+#define DC_TESTMODE			0x0284
+
 #endif

drivers/usb/host/isp1760-udc.h

@@ -0,0 +1,106 @@
+/*
+ * Driver for the NXP ISP1761 device controller
+ *
+ * Copyright 2014 Ideas on Board Oy
+ *
+ * Contacts:
+ *	Laurent Pinchart <laurent.pinchart@ideasonboard.com>
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * version 2 as published by the Free Software Foundation.
+ */
+
+#ifndef _ISP1760_UDC_H_
+#define _ISP1760_UDC_H_
+
+#include <linux/ioport.h>
+#include <linux/list.h>
+#include <linux/spinlock.h>
+#include <linux/timer.h>
+#include <linux/usb/gadget.h>
+
+struct isp1760_device;
+struct isp1760_udc;
+
+enum isp1760_ctrl_state {
+	ISP1760_CTRL_SETUP,		/* Waiting for a SETUP transaction */
+	ISP1760_CTRL_DATA_IN,		/* Setup received, data IN stage */
+	ISP1760_CTRL_DATA_OUT,		/* Setup received, data OUT stage */
+	ISP1760_CTRL_STATUS,		/* 0-length request in status stage */
+};
+
+struct isp1760_ep {
+	struct isp1760_udc *udc;
+	struct usb_ep ep;
+
+	struct list_head queue;
+
+	unsigned int addr;
+	unsigned int maxpacket;
+	char name[7];
+
+	const struct usb_endpoint_descriptor *desc;
+
+	bool rx_pending;
+	bool halted;
+	bool wedged;
+};
+
+/**
+ * struct isp1760_udc - UDC state information
+ * irq: IRQ number
+ * irqname: IRQ name (as passed to request_irq)
+ * regs: Base address of the UDC registers
+ * driver: Gadget driver
+ * gadget: Gadget device
+ * lock: Protects driver, vbus_timer, ep, ep0_*, DC_EPINDEX register
+ * ep: Array of endpoints
+ * ep0_state: Control request state for endpoint 0
+ * ep0_dir: Direction of the current control request
+ * ep0_length: Length of the current control request
+ * connected: Tracks gadget driver bus connection state
+ */
+struct isp1760_udc {
+#if CONFIG_USB_ISP1761_UDC
+	struct isp1760_device *isp;
+
+	int irq;
+	char *irqname;
+	void __iomem *regs;
+
+	struct usb_gadget_driver *driver;
+	struct usb_gadget gadget;
+
+	spinlock_t lock;
+	struct timer_list vbus_timer;
+
+	struct isp1760_ep ep[15];
+
+	enum isp1760_ctrl_state ep0_state;
+	u8 ep0_dir;
+	u16 ep0_length;
+
+	bool connected;
+
+	unsigned int devstatus;
+#endif
+};
+
+#if CONFIG_USB_ISP1761_UDC
+int isp1760_udc_register(struct isp1760_device *isp, int irq,
+			 unsigned long irqflags);
+void isp1760_udc_unregister(struct isp1760_device *isp);
+#else
+static inline int isp1760_udc_register(struct isp1760_device *isp, int irq,
+				       unsigned long irqflags)
+{
+	return 0;
+}
+
+static inline void isp1760_udc_unregister(struct isp1760_device *isp)
+{
+}
+#endif
+
+#endif