/*
 * URB OHCI HCD (Host Controller Driver) for USB.
 *
 * (C) Copyright 1999 Roman Weissgaerber <weissg@vienna.at>
 * (C) Copyright 2000-2001 David Brownell <dbrownell@users.sourceforge.net>
 *
 * usb-ohci.h
 */


static int cc_to_error[16] = {

/* mapping of the OHCI CC status to error codes */
	/* No  Error  */	0,
	/* CRC Error  */	USB_ST_CRC_ERR,
	/* Bit Stuff  */	USB_ST_BIT_ERR,
	/* Data Togg  */	USB_ST_CRC_ERR,
	/* Stall      */	USB_ST_STALLED,
	/* DevNotResp */	-1,
	/* PIDCheck   */	USB_ST_BIT_ERR,
	/* UnExpPID   */	USB_ST_BIT_ERR,
	/* DataOver   */	USB_ST_BUF_ERR,
	/* DataUnder  */	USB_ST_BUF_ERR,
	/* reservd    */	-1,
	/* reservd    */	-1,
	/* BufferOver */	USB_ST_BUF_ERR,
	/* BuffUnder  */	USB_ST_BUF_ERR,
	/* Not Access */	-1,
	/* Not Access */	-1
};

/* ED States */

#define ED_NEW		0x00
#define ED_UNLINK	0x01
#define ED_OPER		0x02
#define ED_DEL		0x04
#define ED_URB_DEL	0x08

/* usb_ohci_ed */
struct ed {
	__u32 hwINFO;
	__u32 hwTailP;
	__u32 hwHeadP;
	__u32 hwNextED;

	struct ed *ed_prev;
	__u8 int_period;
	__u8 int_branch;
	__u8 int_load;
	__u8 int_interval;
	__u8 state;
	__u8 type;
	__u16 last_iso;
	struct ed *ed_rm_list;

	struct usb_device *usb_dev;
	__u32 unused[3];
} __attribute((aligned(16)));
typedef struct ed ed_t;


/* TD info field */
#define TD_CC			0xf0000000
#define TD_CC_GET(td_p)		((td_p >>28) & 0x0f)
#define TD_CC_SET(td_p, cc)	(td_p) = ((td_p) & 0x0fffffff) | (((cc) & 0x0f) << 28)
#define TD_EC			0x0C000000
#define TD_T			0x03000000
#define TD_T_DATA0		0x02000000
#define TD_T_DATA1		0x03000000
#define TD_T_TOGGLE		0x00000000
#define TD_R			0x00040000
#define TD_DI			0x00E00000
#define TD_DI_SET(X)		(((X) & 0x07)<< 21)
#define TD_DP			0x00180000
#define TD_DP_SETUP		0x00000000
#define TD_DP_IN		0x00100000
#define TD_DP_OUT		0x00080000

#define TD_ISO			0x00010000
#define TD_DEL			0x00020000

/* CC Codes */
#define TD_CC_NOERROR		0x00
#define TD_CC_CRC		0x01
#define TD_CC_BITSTUFFING	0x02
#define TD_CC_DATATOGGLEM	0x03
#define TD_CC_STALL		0x04
#define TD_DEVNOTRESP		0x05
#define TD_PIDCHECKFAIL	0x06
#define TD_UNEXPECTEDPID	0x07
#define TD_DATAOVERRUN		0x08
#define TD_DATAUNDERRUN	0x09
#define TD_BUFFEROVERRUN	0x0C
#define TD_BUFFERUNDERRUN	0x0D
#define TD_NOTACCESSED		0x0F


#define MAXPSW 1

struct td {
	__u32 hwINFO;
	__u32 hwCBP;		/* Current Buffer Pointer */
	__u32 hwNextTD;		/* Next TD Pointer */
	__u32 hwBE;		/* Memory Buffer End Pointer */

	__u16 hwPSW[MAXPSW];
	__u8 unused;
	__u8 index;
	struct ed *ed;
	struct td *next_dl_td;
	struct usb_device *usb_dev;
	int transfer_len;
	__u32 data;

	__u32 unused2[2];
} __attribute((aligned(32)));
typedef struct td td_t;

#define OHCI_ED_SKIP	(1 << 14)

/*
 * The HCCA (Host Controller Communications Area) is a 256 byte
 * structure defined in the OHCI spec. that the host controller is
 * told the base address of.  It must be 256-byte aligned.
 */

#define NUM_INTS 32	/* part of the OHCI standard */
struct ohci_hcca {
	__u32	int_table[NUM_INTS];	/* Interrupt ED table */
	__u16	frame_no;		/* current frame number */
	__u16	pad1;			/* set to 0 on each frame_no change */
	__u32	done_head;		/* info returned for an interrupt */
	u8		reserved_for_hc[116];
} __attribute((aligned(256)));


/*
 * Maximum number of root hub ports.
 */
#define MAX_ROOT_PORTS	15	/* maximum OHCI root hub ports */

/*
 * This is the structure of the OHCI controller's memory mapped I/O
 * region.  This is Memory Mapped I/O.	You must use the readl() and
 * writel() macros defined in asm/io.h to access these!!
 */
struct ohci_regs {
	/* control and status registers */
	__u32	revision;
	__u32	control;
	__u32	cmdstatus;
	__u32	intrstatus;
	__u32	intrenable;
	__u32	intrdisable;
	/* memory pointers */
	__u32	hcca;
	__u32	ed_periodcurrent;
	__u32	ed_controlhead;
	__u32	ed_controlcurrent;
	__u32	ed_bulkhead;
	__u32	ed_bulkcurrent;
	__u32	donehead;
	/* frame counters */
	__u32	fminterval;
	__u32	fmremaining;
	__u32	fmnumber;
	__u32	periodicstart;
	__u32	lsthresh;
	/* Root hub ports */
	struct	ohci_roothub_regs {
		__u32	a;
		__u32	b;
		__u32	status;
		__u32	portstatus[MAX_ROOT_PORTS];
	} roothub;
} __attribute((aligned(32)));


/* OHCI CONTROL AND STATUS REGISTER MASKS */

/*
 * HcControl (control) register masks
 */
#define OHCI_CTRL_CBSR	(3 << 0)	/* control/bulk service ratio */
#define OHCI_CTRL_PLE	(1 << 2)	/* periodic list enable */
#define OHCI_CTRL_IE	(1 << 3)	/* isochronous enable */
#define OHCI_CTRL_CLE	(1 << 4)	/* control list enable */
#define OHCI_CTRL_BLE	(1 << 5)	/* bulk list enable */
#define OHCI_CTRL_HCFS	(3 << 6)	/* host controller functional state */
#define OHCI_CTRL_IR	(1 << 8)	/* interrupt routing */
#define OHCI_CTRL_RWC	(1 << 9)	/* remote wakeup connected */
#define OHCI_CTRL_RWE	(1 << 10)	/* remote wakeup enable */

/* pre-shifted values for HCFS */
#	define OHCI_USB_RESET	(0 << 6)
#	define OHCI_USB_RESUME	(1 << 6)
#	define OHCI_USB_OPER	(2 << 6)
#	define OHCI_USB_SUSPEND	(3 << 6)

/*
 * HcCommandStatus (cmdstatus) register masks
 */
#define OHCI_HCR	(1 << 0)	/* host controller reset */
#define OHCI_CLF	(1 << 1)	/* control list filled */
#define OHCI_BLF	(1 << 2)	/* bulk list filled */
#define OHCI_OCR	(1 << 3)	/* ownership change request */
#define OHCI_SOC	(3 << 16)	/* scheduling overrun count */

/*
 * masks used with interrupt registers:
 * HcInterruptStatus (intrstatus)
 * HcInterruptEnable (intrenable)
 * HcInterruptDisable (intrdisable)
 */
#define OHCI_INTR_SO	(1 << 0)	/* scheduling overrun */
#define OHCI_INTR_WDH	(1 << 1)	/* writeback of done_head */
#define OHCI_INTR_SF	(1 << 2)	/* start frame */
#define OHCI_INTR_RD	(1 << 3)	/* resume detect */
#define OHCI_INTR_UE	(1 << 4)	/* unrecoverable error */
#define OHCI_INTR_FNO	(1 << 5)	/* frame number overflow */
#define OHCI_INTR_RHSC	(1 << 6)	/* root hub status change */
#define OHCI_INTR_OC	(1 << 30)	/* ownership change */
#define OHCI_INTR_MIE	(1 << 31)	/* master interrupt enable */


/* Virtual Root HUB */
struct virt_root_hub {
	int devnum; /* Address of Root Hub endpoint */
	void *dev;  /* was urb */
	void *int_addr;
	int send;
	int interval;
};

/* USB HUB CONSTANTS (not OHCI-specific; see hub.h) */

/* destination of request */
#define RH_INTERFACE		0x01
#define RH_ENDPOINT		0x02
#define RH_OTHER		0x03

#define RH_CLASS		0x20
#define RH_VENDOR		0x40

/* Requests: bRequest << 8 | bmRequestType */
#define RH_GET_STATUS		0x0080
#define RH_CLEAR_FEATURE	0x0100
#define RH_SET_FEATURE		0x0300
#define RH_SET_ADDRESS		0x0500
#define RH_GET_DESCRIPTOR	0x0680
#define RH_SET_DESCRIPTOR	0x0700
#define RH_GET_CONFIGURATION	0x0880
#define RH_SET_CONFIGURATION	0x0900
#define RH_GET_STATE		0x0280
#define RH_GET_INTERFACE	0x0A80
#define RH_SET_INTERFACE	0x0B00
#define RH_SYNC_FRAME		0x0C80
/* Our Vendor Specific Request */
#define RH_SET_EP		0x2000


/* Hub port features */
#define RH_PORT_CONNECTION	0x00
#define RH_PORT_ENABLE		0x01
#define RH_PORT_SUSPEND		0x02
#define RH_PORT_OVER_CURRENT	0x03
#define RH_PORT_RESET		0x04
#define RH_PORT_POWER		0x08
#define RH_PORT_LOW_SPEED	0x09

#define RH_C_PORT_CONNECTION	0x10
#define RH_C_PORT_ENABLE	0x11
#define RH_C_PORT_SUSPEND	0x12
#define RH_C_PORT_OVER_CURRENT	0x13
#define RH_C_PORT_RESET		0x14

/* Hub features */
#define RH_C_HUB_LOCAL_POWER	0x00
#define RH_C_HUB_OVER_CURRENT	0x01

#define RH_DEVICE_REMOTE_WAKEUP 0x00
#define RH_ENDPOINT_STALL	0x01

#define RH_ACK			0x01
#define RH_REQ_ERR		-1
#define RH_NACK			   0x00


/* OHCI ROOT HUB REGISTER MASKS */

/* roothub.portstatus [i] bits */
#define RH_PS_CCS		0x00000001	/* current connect status */
#define RH_PS_PES		0x00000002	/* port enable status*/
#define RH_PS_PSS		0x00000004	/* port suspend status */
#define RH_PS_POCI		0x00000008	/* port over current indicator */
#define RH_PS_PRS		0x00000010	/* port reset status */
#define RH_PS_PPS		0x00000100	/* port power status */
#define RH_PS_LSDA		0x00000200	/* low speed device attached */
#define RH_PS_CSC		0x00010000	/* connect status change */
#define RH_PS_PESC		0x00020000	/* port enable status change */
#define RH_PS_PSSC		0x00040000	/* port suspend status change */
#define RH_PS_OCIC		0x00080000	/* over current indicator change */
#define RH_PS_PRSC		0x00100000	/* port reset status change */

/* roothub.status bits */
#define RH_HS_LPS		0x00000001	/* local power status */
#define RH_HS_OCI		0x00000002	/* over current indicator */
#define RH_HS_DRWE		0x00008000	/* device remote wakeup enable */
#define RH_HS_LPSC		0x00010000	/* local power status change */
#define RH_HS_OCIC		0x00020000	/* over current indicator change */
#define RH_HS_CRWE		0x80000000	/* clear remote wakeup enable */

/* roothub.b masks */
#define RH_B_DR			0x0000ffff	/* device removable flags */
#define RH_B_PPCM		0xffff0000	/* port power control mask */

/* roothub.a masks */
#define	RH_A_NDP		(0xff << 0)	/* number of downstream ports */
#define	RH_A_PSM		(1 << 8)	/* power switching mode */
#define	RH_A_NPS		(1 << 9)	/* no power switching */
#define	RH_A_DT			(1 << 10)	/* device type (mbz) */
#define	RH_A_OCPM		(1 << 11)	/* over current protection mode */
#define	RH_A_NOCP		(1 << 12)	/* no over current protection */
#define	RH_A_POTPGT		(0xff << 24)	/* power on to power good time */

/* urb */
#define N_URB_TD 48
typedef struct
{
	ed_t *ed;
	__u16 length;		/* number of tds associated with this request */
	__u16 td_cnt;		/* number of tds already serviced */
	int   state;
	unsigned long pipe;
	int actual_length;
	td_t *td[N_URB_TD];	/* list pointer to all corresponding TDs associated with this request */
} urb_priv_t;
#define URB_DEL 1

/*
 * This is the full ohci controller description
 *
 * Note how the "proper" USB information is just
 * a subset of what the full implementation needs. (Linus)
 */


typedef struct ohci {
	struct ohci_hcca *hcca;		/* hcca */
	/*dma_addr_t hcca_dma;*/

	int irq;
	int disabled;			/* e.g. got a UE, we're hung */
	int sleeping;
	unsigned long flags;		/* for HC bugs */

	struct ohci_regs *regs;		/* OHCI controller's memory */

	ed_t *ed_rm_list[2];		/* lists of all endpoints to be removed */
	ed_t *ed_bulktail;		/* last endpoint of bulk list */
	ed_t *ed_controltail;		/* last endpoint of control list */
	int intrstatus;
	__u32 hc_control;		/* copy of the hc control reg */
	struct usb_device *dev[32];
	struct virt_root_hub rh;

	const char	*slot_name;
} ohci_t;

#define NUM_EDS 8		/* num of preallocated endpoint descriptors */

struct ohci_device {
	ed_t	ed[NUM_EDS];
	int ed_cnt;
};

/* hcd */
/* endpoint */
static int ep_link(ohci_t * ohci, ed_t * ed);
static int ep_unlink(ohci_t * ohci, ed_t * ed);
static ed_t * ep_add_ed(struct usb_device * usb_dev, unsigned long pipe);

/*-------------------------------------------------------------------------*/

/* we need more TDs than EDs */
#define NUM_TD 64

/* +1 so we can align the storage */
td_t gtd[NUM_TD+1];
/* pointers to aligned storage */
td_t *ptd;

/* TDs ... */
static inline struct td *
td_alloc (struct usb_device *usb_dev)
{
	int i;
	struct td	*td;

	td = NULL;
	for (i = 0; i < NUM_TD; i++) {
		if (ptd[i].usb_dev == NULL) {
			td = &ptd[i];
			td->usb_dev = usb_dev;
			break;
		}
	}
	return td;
}

static inline void
ed_free (struct ed *ed)
{
	ed->usb_dev = NULL;
}