drivers/usb/chipidea/ci.h - kernel/lockdown - Git at Google

 /*
  * ci.h - common structures, functions, and macros of the ChipIdea driver
  *
  * Copyright (C) 2008 Chipidea - MIPS Technologies, Inc. All rights reserved.
  *
  * Author: David Lopo
  *
  * 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 __DRIVERS_USB_CHIPIDEA_CI_H
 #define __DRIVERS_USB_CHIPIDEA_CI_H

 #include <linux/list.h>
 #include <linux/irqreturn.h>
 #include <linux/usb.h>
 #include <linux/usb/gadget.h>

 /******************************************************************************
  * DEFINE
  *****************************************************************************/
 #define TD_PAGE_COUNT      5
 #define CI_HDRC_PAGE_SIZE  4096ul /* page size for TD's */
 #define ENDPT_MAX          32

 /******************************************************************************
  * REGISTERS
  *****************************************************************************/
 /* register indices */
 enum ci_hw_regs {
 	CAP_CAPLENGTH,
 	CAP_HCCPARAMS,
 	CAP_DCCPARAMS,
 	CAP_TESTMODE,
 	CAP_LAST = CAP_TESTMODE,
 	OP_USBCMD,
 	OP_USBSTS,
 	OP_USBINTR,
 	OP_DEVICEADDR,
 	OP_ENDPTLISTADDR,
 	OP_PORTSC,
 	OP_DEVLC,
 	OP_OTGSC,
 	OP_USBMODE,
 	OP_ENDPTSETUPSTAT,
 	OP_ENDPTPRIME,
 	OP_ENDPTFLUSH,
 	OP_ENDPTSTAT,
 	OP_ENDPTCOMPLETE,
 	OP_ENDPTCTRL,
 	/* endptctrl1..15 follow */
 	OP_LAST = OP_ENDPTCTRL + ENDPT_MAX / 2,
 };

 /******************************************************************************
  * STRUCTURES
  *****************************************************************************/
 /**
  * struct ci_hw_ep - endpoint representation
  * @ep: endpoint structure for gadget drivers
  * @dir: endpoint direction (TX/RX)
  * @num: endpoint number
  * @type: endpoint type
  * @name: string description of the endpoint
  * @qh: queue head for this endpoint
  * @wedge: is the endpoint wedged
  * @ci: pointer to the controller
  * @lock: pointer to controller's spinlock
  * @td_pool: pointer to controller's TD pool
  */
 struct ci_hw_ep {
 	struct usb_ep				ep;
 	u8					dir;
 	u8					num;
 	u8					type;
 	char					name[16];
 	struct {
 		struct list_head	queue;
 		struct ci_hw_qh		*ptr;
 		dma_addr_t		dma;
 	}					qh;
 	int					wedge;

 	/* global resources */
 	struct ci_hdrc				*ci;
 	spinlock_t				*lock;
 	struct dma_pool				*td_pool;
 	struct td_node				*pending_td;
 };

 enum ci_role {
 	CI_ROLE_HOST = 0,
 	CI_ROLE_GADGET,
 	CI_ROLE_END,
 };

 /**
  * struct ci_role_driver - host/gadget role driver
  * start: start this role
  * stop: stop this role
  * irq: irq handler for this role
  * name: role name string (host/gadget)
  */
 struct ci_role_driver {
 	int		(*start)(struct ci_hdrc *);
 	void		(*stop)(struct ci_hdrc *);
 	irqreturn_t	(*irq)(struct ci_hdrc *);
 	const char	*name;
 };

 /**
  * struct hw_bank - hardware register mapping representation
  * @lpm: set if the device is LPM capable
  * @phys: physical address of the controller's registers
  * @abs: absolute address of the beginning of register window
  * @cap: capability registers
  * @op: operational registers
  * @size: size of the register window
  * @regmap: register lookup table
  */
 struct hw_bank {
 	unsigned	lpm;
 	resource_size_t	phys;
 	void __iomem	*abs;
 	void __iomem	*cap;
 	void __iomem	*op;
 	size_t		size;
 	void __iomem	*regmap[OP_LAST + 1];
 };

 /**
  * struct ci_hdrc - chipidea device representation
  * @dev: pointer to parent device
  * @lock: access synchronization
  * @hw_bank: hardware register mapping
  * @irq: IRQ number
  * @roles: array of supported roles for this controller
  * @role: current role
  * @is_otg: if the device is otg-capable
  * @work: work for role changing
  * @wq: workqueue thread
  * @qh_pool: allocation pool for queue heads
  * @td_pool: allocation pool for transfer descriptors
  * @gadget: device side representation for peripheral controller
  * @driver: gadget driver
  * @hw_ep_max: total number of endpoints supported by hardware
  * @ci_hw_ep: array of endpoints
  * @ep0_dir: ep0 direction
  * @ep0out: pointer to ep0 OUT endpoint
  * @ep0in: pointer to ep0 IN endpoint
  * @status: ep0 status request
  * @setaddr: if we should set the address on status completion
  * @address: usb address received from the host
  * @remote_wakeup: host-enabled remote wakeup
  * @suspended: suspended by host
  * @test_mode: the selected test mode
  * @platdata: platform specific information supplied by parent device
  * @vbus_active: is VBUS active
  * @transceiver: pointer to USB PHY, if any
  * @hcd: pointer to usb_hcd for ehci host driver
  * @debugfs: root dentry for this controller in debugfs
  * @id_event: indicates there is an id event, and handled at ci_otg_work
  * @b_sess_valid_event: indicates there is a vbus event, and handled
  * at ci_otg_work
  * @imx28_write_fix: Freescale imx28 needs swp instruction for writing
  */
 struct ci_hdrc {
 	struct device			*dev;
 	spinlock_t			lock;
 	struct hw_bank			hw_bank;
 	int				irq;
 	struct ci_role_driver		*roles[CI_ROLE_END];
 	enum ci_role			role;
 	bool				is_otg;
 	struct work_struct		work;
 	struct workqueue_struct		*wq;

 	struct dma_pool			*qh_pool;
 	struct dma_pool			*td_pool;

 	struct usb_gadget		gadget;
 	struct usb_gadget_driver	*driver;
 	unsigned			hw_ep_max;
 	struct ci_hw_ep			ci_hw_ep[ENDPT_MAX];
 	u32				ep0_dir;
 	struct ci_hw_ep			*ep0out, *ep0in;

 	struct usb_request		*status;
 	bool				setaddr;
 	u8				address;
 	u8				remote_wakeup;
 	u8				suspended;
 	u8				test_mode;

 	struct ci_hdrc_platform_data	*platdata;
 	int				vbus_active;
 	/* FIXME: some day, we'll not use global phy */
 	bool				global_phy;
 	struct usb_phy			*transceiver;
 	struct usb_hcd			*hcd;
 	struct dentry			*debugfs;
 	bool				id_event;
 	bool				b_sess_valid_event;
 	bool				imx28_write_fix;
 };

 static inline struct ci_role_driver *ci_role(struct ci_hdrc *ci)
 {
 	BUG_ON(ci->role >= CI_ROLE_END || !ci->roles[ci->role]);
 	return ci->roles[ci->role];
 }

 static inline int ci_role_start(struct ci_hdrc *ci, enum ci_role role)
 {
 	int ret;

 	if (role >= CI_ROLE_END)
 		return -EINVAL;

 	if (!ci->roles[role])
 		return -ENXIO;

 	ret = ci->roles[role]->start(ci);
 	if (!ret)
 		ci->role = role;
 	return ret;
 }

 static inline void ci_role_stop(struct ci_hdrc *ci)
 {
 	enum ci_role role = ci->role;

 	if (role == CI_ROLE_END)
 		return;

 	ci->role = CI_ROLE_END;

 	ci->roles[role]->stop(ci);
 }

 /**
  * hw_read: reads from a hw register
  * @reg:  register index
  * @mask: bitfield mask
  *
  * This function returns register contents
  */
 static inline u32 hw_read(struct ci_hdrc *ci, enum ci_hw_regs reg, u32 mask)
 {
 	return ioread32(ci->hw_bank.regmap[reg]) & mask;
 }

 #ifdef CONFIG_SOC_IMX28
 static inline void imx28_ci_writel(u32 val, volatile void __iomem *addr)
 {
 	__asm__ ("swp %0, %0, [%1]" : : "r"(val), "r"(addr));
 }
 #else
 static inline void imx28_ci_writel(u32 val, volatile void __iomem *addr)
 {
 }
 #endif

 static inline void __hw_write(struct ci_hdrc *ci, u32 val,
 		void __iomem *addr)
 {
 	if (ci->imx28_write_fix)
 		imx28_ci_writel(val, addr);
 	else
 		iowrite32(val, addr);
 }

 /**
  * hw_write: writes to a hw register
  * @reg:  register index
  * @mask: bitfield mask
  * @data: new value
  */
 static inline void hw_write(struct ci_hdrc *ci, enum ci_hw_regs reg,
 			    u32 mask, u32 data)
 {
 	if (~mask)
 		data = (ioread32(ci->hw_bank.regmap[reg]) & ~mask)
 			| (data & mask);

 	__hw_write(ci, data, ci->hw_bank.regmap[reg]);
 }

 /**
  * hw_test_and_clear: tests & clears a hw register
  * @reg:  register index
  * @mask: bitfield mask
  *
  * This function returns register contents
  */
 static inline u32 hw_test_and_clear(struct ci_hdrc *ci, enum ci_hw_regs reg,
 				    u32 mask)
 {
 	u32 val = ioread32(ci->hw_bank.regmap[reg]) & mask;

 	__hw_write(ci, val, ci->hw_bank.regmap[reg]);
 	return val;
 }

 /**
  * hw_test_and_write: tests & writes a hw register
  * @reg:  register index
  * @mask: bitfield mask
  * @data: new value
  *
  * This function returns register contents
  */
 static inline u32 hw_test_and_write(struct ci_hdrc *ci, enum ci_hw_regs reg,
 				    u32 mask, u32 data)
 {
 	u32 val = hw_read(ci, reg, ~0);

 	hw_write(ci, reg, mask, data);
 	return (val & mask) >> __ffs(mask);
 }

 int hw_device_reset(struct ci_hdrc *ci, u32 mode);

 int hw_port_test_set(struct ci_hdrc *ci, u8 mode);

 u8 hw_port_test_get(struct ci_hdrc *ci);

 int hw_wait_reg(struct ci_hdrc *ci, enum ci_hw_regs reg, u32 mask,
 				u32 value, unsigned int timeout_ms);

 #endif	/* __DRIVERS_USB_CHIPIDEA_CI_H */
	/*
	* ci.h - common structures, functions, and macros of the ChipIdea driver
	*
	* Copyright (C) 2008 Chipidea - MIPS Technologies, Inc. All rights reserved.
	*
	* Author: David Lopo
	*
	* 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 __DRIVERS_USB_CHIPIDEA_CI_H
	#define __DRIVERS_USB_CHIPIDEA_CI_H

	#include <linux/list.h>
	#include <linux/irqreturn.h>
	#include <linux/usb.h>
	#include <linux/usb/gadget.h>

	/******************************************************************************
	* DEFINE
	*****************************************************************************/
	#define TD_PAGE_COUNT 5
	#define CI_HDRC_PAGE_SIZE 4096ul /* page size for TD's */
	#define ENDPT_MAX 32

	/******************************************************************************
	* REGISTERS
	*****************************************************************************/
	/* register indices */
	enum ci_hw_regs {
	CAP_CAPLENGTH,
	CAP_HCCPARAMS,
	CAP_DCCPARAMS,
	CAP_TESTMODE,
	CAP_LAST = CAP_TESTMODE,
	OP_USBCMD,
	OP_USBSTS,
	OP_USBINTR,
	OP_DEVICEADDR,
	OP_ENDPTLISTADDR,
	OP_PORTSC,
	OP_DEVLC,
	OP_OTGSC,
	OP_USBMODE,
	OP_ENDPTSETUPSTAT,
	OP_ENDPTPRIME,
	OP_ENDPTFLUSH,
	OP_ENDPTSTAT,
	OP_ENDPTCOMPLETE,
	OP_ENDPTCTRL,
	/* endptctrl1..15 follow */
	OP_LAST = OP_ENDPTCTRL + ENDPT_MAX / 2,
	};

	/******************************************************************************
	* STRUCTURES
	*****************************************************************************/
	/**
	* struct ci_hw_ep - endpoint representation
	* @ep: endpoint structure for gadget drivers
	* @dir: endpoint direction (TX/RX)
	* @num: endpoint number
	* @type: endpoint type
	* @name: string description of the endpoint
	* @qh: queue head for this endpoint
	* @wedge: is the endpoint wedged
	* @ci: pointer to the controller
	* @lock: pointer to controller's spinlock
	* @td_pool: pointer to controller's TD pool
	*/
	struct ci_hw_ep {
	struct usb_ep ep;
	u8 dir;
	u8 num;
	u8 type;
	char name[16];
	struct {
	struct list_head queue;
	struct ci_hw_qh *ptr;
	dma_addr_t dma;
	} qh;
	int wedge;

	/* global resources */
	struct ci_hdrc *ci;
	spinlock_t *lock;
	struct dma_pool *td_pool;
	struct td_node *pending_td;
	};

	enum ci_role {
	CI_ROLE_HOST = 0,
	CI_ROLE_GADGET,
	CI_ROLE_END,
	};

	/**
	* struct ci_role_driver - host/gadget role driver
	* start: start this role
	* stop: stop this role
	* irq: irq handler for this role
	* name: role name string (host/gadget)
	*/
	struct ci_role_driver {
	int (start)(struct ci_hdrc );
	void (stop)(struct ci_hdrc );
	irqreturn_t (irq)(struct ci_hdrc );
	const char *name;
	};

	/**
	* struct hw_bank - hardware register mapping representation
	* @lpm: set if the device is LPM capable
	* @phys: physical address of the controller's registers
	* @abs: absolute address of the beginning of register window
	* @cap: capability registers
	* @op: operational registers
	* @size: size of the register window
	* @regmap: register lookup table
	*/
	struct hw_bank {
	unsigned lpm;
	resource_size_t phys;
	void __iomem *abs;
	void __iomem *cap;
	void __iomem *op;
	size_t size;
	void __iomem *regmap[OP_LAST + 1];
	};

	/**
	* struct ci_hdrc - chipidea device representation
	* @dev: pointer to parent device
	* @lock: access synchronization
	* @hw_bank: hardware register mapping
	* @irq: IRQ number
	* @roles: array of supported roles for this controller
	* @role: current role
	* @is_otg: if the device is otg-capable
	* @work: work for role changing
	* @wq: workqueue thread
	* @qh_pool: allocation pool for queue heads
	* @td_pool: allocation pool for transfer descriptors
	* @gadget: device side representation for peripheral controller
	* @driver: gadget driver
	* @hw_ep_max: total number of endpoints supported by hardware
	* @ci_hw_ep: array of endpoints
	* @ep0_dir: ep0 direction
	* @ep0out: pointer to ep0 OUT endpoint
	* @ep0in: pointer to ep0 IN endpoint
	* @status: ep0 status request
	* @setaddr: if we should set the address on status completion
	* @address: usb address received from the host
	* @remote_wakeup: host-enabled remote wakeup
	* @suspended: suspended by host
	* @test_mode: the selected test mode
	* @platdata: platform specific information supplied by parent device
	* @vbus_active: is VBUS active
	* @transceiver: pointer to USB PHY, if any
	* @hcd: pointer to usb_hcd for ehci host driver
	* @debugfs: root dentry for this controller in debugfs
	* @id_event: indicates there is an id event, and handled at ci_otg_work
	* @b_sess_valid_event: indicates there is a vbus event, and handled
	* at ci_otg_work
	* @imx28_write_fix: Freescale imx28 needs swp instruction for writing
	*/
	struct ci_hdrc {
	struct device *dev;
	spinlock_t lock;
	struct hw_bank hw_bank;
	int irq;
	struct ci_role_driver *roles[CI_ROLE_END];
	enum ci_role role;
	bool is_otg;
	struct work_struct work;
	struct workqueue_struct *wq;

	struct dma_pool *qh_pool;
	struct dma_pool *td_pool;

	struct usb_gadget gadget;
	struct usb_gadget_driver *driver;
	unsigned hw_ep_max;
	struct ci_hw_ep ci_hw_ep[ENDPT_MAX];
	u32 ep0_dir;
	struct ci_hw_ep ep0out, ep0in;

	struct usb_request *status;
	bool setaddr;
	u8 address;
	u8 remote_wakeup;
	u8 suspended;
	u8 test_mode;

	struct ci_hdrc_platform_data *platdata;
	int vbus_active;
	/* FIXME: some day, we'll not use global phy */
	bool global_phy;
	struct usb_phy *transceiver;
	struct usb_hcd *hcd;
	struct dentry *debugfs;
	bool id_event;
	bool b_sess_valid_event;
	bool imx28_write_fix;
	};

	static inline struct ci_role_driver ci_role(struct ci_hdrc ci)
	{
	BUG_ON(ci->role >= CI_ROLE_END \|\| !ci->roles[ci->role]);
	return ci->roles[ci->role];
	}

	static inline int ci_role_start(struct ci_hdrc *ci, enum ci_role role)
	{
	int ret;

	if (role >= CI_ROLE_END)
	return -EINVAL;

	if (!ci->roles[role])
	return -ENXIO;

	ret = ci->roles[role]->start(ci);
	if (!ret)
	ci->role = role;
	return ret;
	}

	static inline void ci_role_stop(struct ci_hdrc *ci)
	{
	enum ci_role role = ci->role;

	if (role == CI_ROLE_END)
	return;

	ci->role = CI_ROLE_END;

	ci->roles[role]->stop(ci);
	}

	/**
	* hw_read: reads from a hw register
	* @reg: register index
	* @mask: bitfield mask
	*
	* This function returns register contents
	*/
	static inline u32 hw_read(struct ci_hdrc *ci, enum ci_hw_regs reg, u32 mask)
	{
	return ioread32(ci->hw_bank.regmap[reg]) & mask;
	}

	#ifdef CONFIG_SOC_IMX28
	static inline void imx28_ci_writel(u32 val, volatile void __iomem *addr)
	{
	__asm__ ("swp %0, %0, [%1]" : : "r"(val), "r"(addr));
	}
	#else
	static inline void imx28_ci_writel(u32 val, volatile void __iomem *addr)
	{
	}
	#endif

	static inline void __hw_write(struct ci_hdrc *ci, u32 val,
	void __iomem *addr)
	{
	if (ci->imx28_write_fix)
	imx28_ci_writel(val, addr);
	else
	iowrite32(val, addr);
	}

	/**
	* hw_write: writes to a hw register
	* @reg: register index
	* @mask: bitfield mask
	* @data: new value
	*/
	static inline void hw_write(struct ci_hdrc *ci, enum ci_hw_regs reg,
	u32 mask, u32 data)
	{
	if (~mask)
	data = (ioread32(ci->hw_bank.regmap[reg]) & ~mask)
	\| (data & mask);

	__hw_write(ci, data, ci->hw_bank.regmap[reg]);
	}

	/**
	* hw_test_and_clear: tests & clears a hw register
	* @reg: register index
	* @mask: bitfield mask
	*
	* This function returns register contents
	*/
	static inline u32 hw_test_and_clear(struct ci_hdrc *ci, enum ci_hw_regs reg,
	u32 mask)
	{
	u32 val = ioread32(ci->hw_bank.regmap[reg]) & mask;

	__hw_write(ci, val, ci->hw_bank.regmap[reg]);
	return val;
	}

	/**
	* hw_test_and_write: tests & writes a hw register
	* @reg: register index
	* @mask: bitfield mask
	* @data: new value
	*
	* This function returns register contents
	*/
	static inline u32 hw_test_and_write(struct ci_hdrc *ci, enum ci_hw_regs reg,
	u32 mask, u32 data)
	{
	u32 val = hw_read(ci, reg, ~0);

	hw_write(ci, reg, mask, data);
	return (val & mask) >> __ffs(mask);
	}

	int hw_device_reset(struct ci_hdrc *ci, u32 mode);

	int hw_port_test_set(struct ci_hdrc *ci, u8 mode);

	u8 hw_port_test_get(struct ci_hdrc *ci);

	int hw_wait_reg(struct ci_hdrc *ci, enum ci_hw_regs reg, u32 mask,
	u32 value, unsigned int timeout_ms);

	#endif /* __DRIVERS_USB_CHIPIDEA_CI_H */