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// SPDX-License-Identifier: GPL-2.0
* ci.h - common structures, functions, and macros of the ChipIdea driver
* Copyright (C) 2008 Chipidea - MIPS Technologies, Inc. All rights reserved.
* Author: David Lopo
#include <linux/list.h>
#include <linux/irqreturn.h>
#include <linux/usb.h>
#include <linux/usb/gadget.h>
#include <linux/usb/otg-fsm.h>
#include <linux/usb/otg.h>
#include <linux/usb/role.h>
#include <linux/ulpi/interface.h>
#define TD_PAGE_COUNT 5
#define CI_HDRC_PAGE_SIZE 4096ul /* page size for TD's */
#define ENDPT_MAX 32
/* Identification Registers */
#define ID_ID 0x0
#define ID_HWGENERAL 0x4
#define ID_HWHOST 0x8
#define ID_HWDEVICE 0xc
#define ID_HWTXBUF 0x10
#define ID_HWRXBUF 0x14
#define ID_SBUSCFG 0x90
/* register indices */
enum ci_hw_regs {
/* endptctrl1..15 follow */
* 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 {
enum ci_revision {
CI_REVISION_1X = 10, /* Revision 1.x */
CI_REVISION_20 = 20, /* Revision 2.0 */
CI_REVISION_21, /* Revision 2.1 */
CI_REVISION_22, /* Revision 2.2 */
CI_REVISION_23, /* Revision 2.3 */
CI_REVISION_24, /* Revision 2.4 */
CI_REVISION_25, /* Revision 2.5 */
CI_REVISION_25_PLUS, /* Revision above than 2.5 */
CI_REVISION_UNKNOWN = 99, /* Unknown Revision */
* 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
* @fsm: otg finite state machine
* @otg_fsm_hrtimer: hrtimer for otg fsm timers
* @hr_timeouts: time out list for active otg fsm timers
* @enabled_otg_timer_bits: bits of enabled otg timers
* @next_otg_timer: next nearest enabled timer to be expired
* @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
* @resume_state: save the state of gadget suspend from
* @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
* @ulpi: pointer to ULPI device, if any
* @ulpi_ops: ULPI read/write ops for this device
* @phy: pointer to PHY, if any
* @usb_phy: pointer to USB PHY, if any and if using the USB PHY framework
* @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
* @supports_runtime_pm: if runtime pm is supported
* @in_lpm: if the core in low power mode
* @wakeup_int: if wakeup interrupt occur
* @rev: The revision number for controller
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 usb_otg otg;
struct otg_fsm fsm;
struct hrtimer otg_fsm_hrtimer;
ktime_t hr_timeouts[NUM_OTG_FSM_TIMERS];
unsigned enabled_otg_timer_bits;
enum otg_fsm_timer next_otg_timer;
struct usb_role_switch *role_switch;
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;
enum usb_device_state resume_state;
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;
struct ulpi *ulpi;
struct ulpi_ops ulpi_ops;
struct phy *phy;
/* old usb_phy interface */
struct usb_phy *usb_phy;
struct usb_hcd *hcd;
struct dentry *debugfs;
bool id_event;
bool b_sess_valid_event;
bool imx28_write_fix;
bool supports_runtime_pm;
bool in_lpm;
bool wakeup_int;
enum ci_revision rev;
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)
ci->role = CI_ROLE_END;
static inline enum usb_role ci_role_to_usb_role(struct ci_hdrc *ci)
if (ci->role == CI_ROLE_HOST)
else if (ci->role == CI_ROLE_GADGET && ci->vbus_active)
* hw_read_id_reg: reads from a identification register
* @ci: the controller
* @offset: offset from the beginning of identification registers region
* @mask: bitfield mask
* This function returns register contents
static inline u32 hw_read_id_reg(struct ci_hdrc *ci, u32 offset, u32 mask)
return ioread32(ci->hw_bank.abs + offset) & mask;
* hw_write_id_reg: writes to a identification register
* @ci: the controller
* @offset: offset from the beginning of identification registers region
* @mask: bitfield mask
* @data: new value
static inline void hw_write_id_reg(struct ci_hdrc *ci, u32 offset,
u32 mask, u32 data)
if (~mask)
data = (ioread32(ci->hw_bank.abs + offset) & ~mask)
| (data & mask);
iowrite32(data, ci->hw_bank.abs + offset);
* hw_read: reads from a hw register
* @ci: the controller
* @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;
static inline void imx28_ci_writel(u32 val, volatile void __iomem *addr)
__asm__ ("swp %0, %0, [%1]" : : "r"(val), "r"(addr));
static inline void imx28_ci_writel(u32 val, volatile void __iomem *addr)
static inline void __hw_write(struct ci_hdrc *ci, u32 val,
void __iomem *addr)
if (ci->imx28_write_fix)
imx28_ci_writel(val, addr);
iowrite32(val, addr);
* hw_write: writes to a hw register
* @ci: the controller
* @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
* @ci: the controller
* @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
* @ci: the controller
* @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);
* ci_otg_is_fsm_mode: runtime check if otg controller
* is in otg fsm mode.
* @ci: chipidea device
static inline bool ci_otg_is_fsm_mode(struct ci_hdrc *ci)
struct usb_otg_caps *otg_caps = &ci->platdata->ci_otg_caps;
return ci->is_otg && ci->roles[CI_ROLE_HOST] &&
ci->roles[CI_ROLE_GADGET] && (otg_caps->srp_support ||
otg_caps->hnp_support || otg_caps->adp_support);
return false;
int ci_ulpi_init(struct ci_hdrc *ci);
void ci_ulpi_exit(struct ci_hdrc *ci);
int ci_ulpi_resume(struct ci_hdrc *ci);
u32 hw_read_intr_enable(struct ci_hdrc *ci);
u32 hw_read_intr_status(struct ci_hdrc *ci);
int hw_device_reset(struct ci_hdrc *ci);
int hw_port_test_set(struct ci_hdrc *ci, u8 mode);
u8 hw_port_test_get(struct ci_hdrc *ci);
void hw_phymode_configure(struct ci_hdrc *ci);
void ci_platform_configure(struct ci_hdrc *ci);
void dbg_create_files(struct ci_hdrc *ci);
void dbg_remove_files(struct ci_hdrc *ci);