musb_core.h

/*
 * MUSB OTG driver defines
 *
 * Copyright 2005 Mentor Graphics Corporation
 * Copyright (C) 2005-2006 by Texas Instruments
 * Copyright (C) 2006-2007 Nokia Corporation
 *
 * 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.
 *
 * This program is distributed in the hope that it will be useful, but
 * WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
 * 02110-1301 USA
 *
 * THIS SOFTWARE IS PROVIDED "AS IS" AND ANY EXPRESS OR IMPLIED
 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.  IN
 * NO EVENT SHALL THE AUTHORS BE LIABLE FOR ANY DIRECT, INDIRECT,
 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
 * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
 * ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 *
 */

#ifndef __MUSB_CORE_H__
#define __MUSB_CORE_H__

#include <linux/slab.h>
#include <linux/list.h>
#include <linux/interrupt.h>
#include <linux/smp_lock.h>
#include <linux/errno.h>
#include <linux/clk.h>
#include <linux/device.h>
#include <linux/usb/ch9.h>
#include <linux/usb/gadget.h>
#include <linux/usb.h>
#include <linux/usb/otg.h>
#include <linux/usb/musb.h>

struct musb;
struct musb_hw_ep;
struct musb_ep;


#include "musb_debug.h"
#include "musb_dma.h"

#include "musb_io.h"
#include "musb_regs.h"

#include "musb_gadget.h"
#include "../core/hcd.h"
#include "musb_host.h"



#ifdef CONFIG_USB_MUSB_OTG

#define	is_peripheral_enabled(musb)	((musb)->board_mode != MUSB_HOST)
#define	is_host_enabled(musb)		((musb)->board_mode != MUSB_PERIPHERAL)
#define	is_otg_enabled(musb)		((musb)->board_mode == MUSB_OTG)

/* NOTE:  otg and peripheral-only state machines start at B_IDLE.
 * OTG or host-only go to A_IDLE when ID is sensed.
 */
#define is_peripheral_active(m)		(!(m)->is_host)
#define is_host_active(m)		((m)->is_host)

#else
#define	is_peripheral_enabled(musb)	is_peripheral_capable()
#define	is_host_enabled(musb)		is_host_capable()
#define	is_otg_enabled(musb)		0

#define	is_peripheral_active(musb)	is_peripheral_capable()
#define	is_host_active(musb)		is_host_capable()
#endif

#if defined(CONFIG_USB_MUSB_OTG) || defined(CONFIG_USB_MUSB_PERIPHERAL)
/* for some reason, the "select USB_GADGET_MUSB_HDRC" doesn't always
 * override that choice selection (often USB_GADGET_DUMMY_HCD).
 */
#ifndef CONFIG_USB_GADGET_MUSB_HDRC
#error bogus Kconfig output ... select CONFIG_USB_GADGET_MUSB_HDRC
#endif
#endif	/* need MUSB gadget selection */


#ifdef CONFIG_PROC_FS
#include <linux/fs.h>
#define MUSB_CONFIG_PROC_FS
#endif

/****************************** PERIPHERAL ROLE *****************************/

#ifdef CONFIG_USB_GADGET_MUSB_HDRC

#define	is_peripheral_capable()	(1)

extern irqreturn_t musb_g_ep0_irq(struct musb *);
extern void musb_g_tx(struct musb *, u8);
extern void musb_g_rx(struct musb *, u8);
extern void musb_g_reset(struct musb *);
extern void musb_g_suspend(struct musb *);
extern void musb_g_resume(struct musb *);
extern void musb_g_wakeup(struct musb *);
extern void musb_g_disconnect(struct musb *);

#else

#define	is_peripheral_capable()	(0)

static inline irqreturn_t musb_g_ep0_irq(struct musb *m) { return IRQ_NONE; }
static inline void musb_g_reset(struct musb *m) {}
static inline void musb_g_suspend(struct musb *m) {}
static inline void musb_g_resume(struct musb *m) {}
static inline void musb_g_wakeup(struct musb *m) {}
static inline void musb_g_disconnect(struct musb *m) {}

#endif

/****************************** HOST ROLE ***********************************/

#ifdef CONFIG_USB_MUSB_HDRC_HCD

#define	is_host_capable()	(1)

extern irqreturn_t musb_h_ep0_irq(struct musb *);
extern void musb_host_tx(struct musb *, u8);
extern void musb_host_rx(struct musb *, u8);

#else

#define	is_host_capable()	(0)

static inline irqreturn_t musb_h_ep0_irq(struct musb *m) { return IRQ_NONE; }
static inline void musb_host_tx(struct musb *m, u8 e) {}
static inline void musb_host_rx(struct musb *m, u8 e) {}

#endif


/****************************** CONSTANTS ********************************/

#ifndef MUSB_C_NUM_EPS
#define MUSB_C_NUM_EPS ((u8)16)
#endif

#ifndef MUSB_MAX_END0_PACKET
#define MUSB_MAX_END0_PACKET ((u16)MUSB_EP0_FIFOSIZE)
#endif

/* host side ep0 states */
enum musb_h_ep0_state {
	MUSB_EP0_IDLE,
	MUSB_EP0_START,			/* expect ack of setup */
	MUSB_EP0_IN,			/* expect IN DATA */
	MUSB_EP0_OUT,			/* expect ack of OUT DATA */
	MUSB_EP0_STATUS,		/* expect ack of STATUS */
} __attribute__ ((packed));

/* peripheral side ep0 states */
enum musb_g_ep0_state {
	MUSB_EP0_STAGE_SETUP,		/* idle, waiting for setup */
	MUSB_EP0_STAGE_TX,		/* IN data */
	MUSB_EP0_STAGE_RX,		/* OUT data */
	MUSB_EP0_STAGE_STATUSIN,	/* (after OUT data) */
	MUSB_EP0_STAGE_STATUSOUT,	/* (after IN data) */
	MUSB_EP0_STAGE_ACKWAIT,		/* after zlp, before statusin */
} __attribute__ ((packed));

/* OTG protocol constants */
#define OTG_TIME_A_WAIT_VRISE	100		/* msec (max) */
#define OTG_TIME_A_WAIT_BCON	0		/* 0=infinite; min 1000 msec */
#define OTG_TIME_A_IDLE_BDIS	200		/* msec (min) */

/*************************** REGISTER ACCESS ********************************/

/* Endpoint registers (other than dynfifo setup) can be accessed either
 * directly with the "flat" model, or after setting up an index register.
 */

#if defined(CONFIG_ARCH_DAVINCI) || defined(CONFIG_ARCH_OMAP2430) \
		|| defined(CONFIG_ARCH_OMAP3430)
/* REVISIT indexed access seemed to
 * misbehave (on DaVinci) for at least peripheral IN ...
 */
#define	MUSB_FLAT_REG
#endif

/* TUSB mapping: "flat" plus ep0 special cases */
#if	defined(CONFIG_USB_TUSB6010)
#define musb_ep_select(_mbase, _epnum) \
	musb_writeb((_mbase), MUSB_INDEX, (_epnum))
#define	MUSB_EP_OFFSET			MUSB_TUSB_OFFSET

/* "flat" mapping: each endpoint has its own i/o address */
#elif	defined(MUSB_FLAT_REG)
#define musb_ep_select(_mbase, _epnum)	(((void)(_mbase)), ((void)(_epnum)))
#define	MUSB_EP_OFFSET			MUSB_FLAT_OFFSET

/* "indexed" mapping: INDEX register controls register bank select */
#else
#define musb_ep_select(_mbase, _epnum) \
	musb_writeb((_mbase), MUSB_INDEX, (_epnum))
#define	MUSB_EP_OFFSET			MUSB_INDEXED_OFFSET
#endif

/****************************** FUNCTIONS ********************************/

#define MUSB_HST_MODE(_musb)\
	{ (_musb)->is_host = true; }
#define MUSB_DEV_MODE(_musb) \
	{ (_musb)->is_host = false; }

#define test_devctl_hst_mode(_x) \
	(musb_readb((_x)->mregs, MUSB_DEVCTL)&MUSB_DEVCTL_HM)

#define MUSB_MODE(musb) ((musb)->is_host ? "Host" : "Peripheral")

/******************************** TYPES *************************************/

/*
 * struct musb_hw_ep - endpoint hardware (bidirectional)
 *
 * Ordered slightly for better cacheline locality.
 */
struct musb_hw_ep {
	struct musb		*musb;
	void __iomem		*fifo;
	void __iomem		*regs;

#ifdef CONFIG_USB_TUSB6010
	void __iomem		*conf;
#endif

	/* index in musb->endpoints[]  */
	u8			epnum;

	/* hardware configuration, possibly dynamic */
	bool			is_shared_fifo;
	bool			tx_double_buffered;
	bool			rx_double_buffered;
	u16			max_packet_sz_tx;
	u16			max_packet_sz_rx;

	struct dma_channel	*tx_channel;
	struct dma_channel	*rx_channel;

#ifdef CONFIG_USB_TUSB6010
	/* TUSB has "asynchronous" and "synchronous" dma modes */
	dma_addr_t		fifo_async;
	dma_addr_t		fifo_sync;
	void __iomem		*fifo_sync_va;
#endif

#ifdef CONFIG_USB_MUSB_HDRC_HCD
	void __iomem		*target_regs;

	/* currently scheduled peripheral endpoint */
	struct musb_qh		*in_qh;
	struct musb_qh		*out_qh;

	u8			rx_reinit;
	u8			tx_reinit;
#endif

#ifdef CONFIG_USB_GADGET_MUSB_HDRC
	/* peripheral side */
	struct musb_ep		ep_in;			/* TX */
	struct musb_ep		ep_out;			/* RX */
#endif
};

static inline struct usb_request *next_in_request(struct musb_hw_ep *hw_ep)
{
#ifdef CONFIG_USB_GADGET_MUSB_HDRC
	return next_request(&hw_ep->ep_in);
#else
	return NULL;
#endif
}

static inline struct usb_request *next_out_request(struct musb_hw_ep *hw_ep)
{
#ifdef CONFIG_USB_GADGET_MUSB_HDRC
	return next_request(&hw_ep->ep_out);
#else
	return NULL;
#endif
}

/*
 * struct musb - Driver instance data.
 */
struct musb {
	/* device lock */
	spinlock_t		lock;
	struct clk		*clock;
	irqreturn_t		(*isr)(int, void *);
	struct work_struct	irq_work;

/* this hub status bit is reserved by USB 2.0 and not seen by usbcore */
#define MUSB_PORT_STAT_RESUME	(1 << 31)

	u32			port1_status;

#ifdef CONFIG_USB_MUSB_HDRC_HCD
	unsigned long		rh_timer;

	enum musb_h_ep0_state	ep0_stage;

	/* bulk traffic normally dedicates endpoint hardware, and each
	 * direction has its own ring of host side endpoints.
	 * we try to progress the transfer at the head of each endpoint's
	 * queue until it completes or NAKs too much; then we try the next
	 * endpoint.
	 */
	struct musb_hw_ep	*bulk_ep;

	struct list_head	control;	/* of musb_qh */
	struct list_head	in_bulk;	/* of musb_qh */
	struct list_head	out_bulk;	/* of musb_qh */
	struct musb_qh		*periodic[32];	/* tree of interrupt+iso */
#endif

	/* called with IRQs blocked; ON/nonzero implies starting a session,
	 * and waiting at least a_wait_vrise_tmout.
	 */
	void			(*board_set_vbus)(struct musb *, int is_on);

	struct dma_controller	*dma_controller;

	struct device		*controller;
	void __iomem		*ctrl_base;
	void __iomem		*mregs;

#ifdef CONFIG_USB_TUSB6010
	dma_addr_t		async;
	dma_addr_t		sync;
	void __iomem		*sync_va;
#endif

	/* passed down from chip/board specific irq handlers */
	u8			int_usb;
	u16			int_rx;
	u16			int_tx;

	struct otg_transceiver	xceiv;

	int nIrq;
	unsigned		irq_wake:1;

	struct musb_hw_ep	 endpoints[MUSB_C_NUM_EPS];
#define control_ep		endpoints

#define VBUSERR_RETRY_COUNT	3
	u16			vbuserr_retry;
	u16 epmask;
	u8 nr_endpoints;

	u8 board_mode;		/* enum musb_mode */
	int			(*board_set_power)(int state);

	int			(*set_clock)(struct clk *clk, int is_active);

	u8			min_power;	/* vbus for periph, in mA/2 */

	bool			is_host;

	int			a_wait_bcon;	/* VBUS timeout in msecs */
	unsigned long		idle_timeout;	/* Next timeout in jiffies */

	/* active means connected and not suspended */
	unsigned		is_active:1;

	unsigned is_multipoint:1;
	unsigned ignore_disconnect:1;	/* during bus resets */

#ifdef C_MP_TX
	unsigned bulk_split:1;
#define	can_bulk_split(musb,type) \
		(((type) == USB_ENDPOINT_XFER_BULK) && (musb)->bulk_split)
#else
#define	can_bulk_split(musb, type)	0
#endif

#ifdef C_MP_RX
	unsigned bulk_combine:1;
#define	can_bulk_combine(musb,type) \
		(((type) == USB_ENDPOINT_XFER_BULK) && (musb)->bulk_combine)
#else
#define	can_bulk_combine(musb, type)	0
#endif

#ifdef CONFIG_USB_GADGET_MUSB_HDRC
	/* is_suspended means USB B_PERIPHERAL suspend */
	unsigned		is_suspended:1;

	/* may_wakeup means remote wakeup is enabled */
	unsigned		may_wakeup:1;

	/* is_self_powered is reported in device status and the
	 * config descriptor.  is_bus_powered means B_PERIPHERAL
	 * draws some VBUS current; both can be true.
	 */
	unsigned		is_self_powered:1;
	unsigned		is_bus_powered:1;

	unsigned		set_address:1;
	unsigned		test_mode:1;
	unsigned		softconnect:1;

	u8			address;
	u8			test_mode_nr;
	u16			ackpend;		/* ep0 */
	enum musb_g_ep0_state	ep0_state;
	struct usb_gadget	g;			/* the gadget */
	struct usb_gadget_driver *gadget_driver;	/* its driver */
#endif

	struct musb_hdrc_config	*config;

#ifdef MUSB_CONFIG_PROC_FS
	struct proc_dir_entry *proc_entry;
#endif
};

static inline void musb_set_vbus(struct musb *musb, int is_on)
{
	musb->board_set_vbus(musb, is_on);
}

#ifdef CONFIG_USB_GADGET_MUSB_HDRC
static inline struct musb *gadget_to_musb(struct usb_gadget *g)
{
	return container_of(g, struct musb, g);
}
#endif


/***************************** Glue it together *****************************/

extern const char musb_driver_name[];

extern void musb_start(struct musb *musb);
extern void musb_stop(struct musb *musb);

extern void musb_write_fifo(struct musb_hw_ep *ep, u16 len, const u8 *src);
extern void musb_read_fifo(struct musb_hw_ep *ep, u16 len, u8 *dst);

extern void musb_load_testpacket(struct musb *);

extern irqreturn_t musb_interrupt(struct musb *);

extern void musb_platform_enable(struct musb *musb);
extern void musb_platform_disable(struct musb *musb);

extern void musb_hnp_stop(struct musb *musb);

extern int musb_platform_set_mode(struct musb *musb, u8 musb_mode);

#if defined(CONFIG_USB_TUSB6010) || \
	defined(CONFIG_ARCH_OMAP2430) || defined(CONFIG_ARCH_OMAP34XX)
extern void musb_platform_try_idle(struct musb *musb, unsigned long timeout);
#else
#define musb_platform_try_idle(x, y)		do {} while (0)
#endif

#ifdef CONFIG_USB_TUSB6010
extern int musb_platform_get_vbus_status(struct musb *musb);
#else
#define musb_platform_get_vbus_status(x)	0
#endif

extern int __init musb_platform_init(struct musb *musb);
extern int musb_platform_exit(struct musb *musb);

#endif	/* __MUSB_CORE_H__ */