xref: /openbmc/linux/drivers/usb/chipidea/ci.h (revision 3e30a927) 
1 // SPDX-License-Identifier: GPL-2.0
2 /*
3  * ci.h - common structures, functions, and macros of the ChipIdea driver
4  *
5  * Copyright (C) 2008 Chipidea - MIPS Technologies, Inc. All rights reserved.
6  *
7  * Author: David Lopo
8  */
9 
10 #ifndef __DRIVERS_USB_CHIPIDEA_CI_H
11 #define __DRIVERS_USB_CHIPIDEA_CI_H
12 
13 #include <linux/list.h>
14 #include <linux/irqreturn.h>
15 #include <linux/usb.h>
16 #include <linux/usb/gadget.h>
17 #include <linux/usb/otg-fsm.h>
18 #include <linux/usb/otg.h>
19 #include <linux/usb/role.h>
20 #include <linux/ulpi/interface.h>
21 
22 /******************************************************************************
23  * DEFINE
24  *****************************************************************************/
25 #define TD_PAGE_COUNT      5
26 #define CI_HDRC_PAGE_SIZE  4096ul /* page size for TD's */
27 #define ENDPT_MAX          32
28 
29 /******************************************************************************
30  * REGISTERS
31  *****************************************************************************/
32 /* Identification Registers */
33 #define ID_ID				0x0
34 #define ID_HWGENERAL			0x4
35 #define ID_HWHOST			0x8
36 #define ID_HWDEVICE			0xc
37 #define ID_HWTXBUF			0x10
38 #define ID_HWRXBUF			0x14
39 #define ID_SBUSCFG			0x90
40 
41 /* register indices */
42 enum ci_hw_regs {
43 	CAP_CAPLENGTH,
44 	CAP_HCCPARAMS,
45 	CAP_DCCPARAMS,
46 	CAP_TESTMODE,
47 	CAP_LAST = CAP_TESTMODE,
48 	OP_USBCMD,
49 	OP_USBSTS,
50 	OP_USBINTR,
51 	OP_DEVICEADDR,
52 	OP_ENDPTLISTADDR,
53 	OP_TTCTRL,
54 	OP_BURSTSIZE,
55 	OP_ULPI_VIEWPORT,
56 	OP_PORTSC,
57 	OP_DEVLC,
58 	OP_OTGSC,
59 	OP_USBMODE,
60 	OP_ENDPTSETUPSTAT,
61 	OP_ENDPTPRIME,
62 	OP_ENDPTFLUSH,
63 	OP_ENDPTSTAT,
64 	OP_ENDPTCOMPLETE,
65 	OP_ENDPTCTRL,
66 	/* endptctrl1..15 follow */
67 	OP_LAST = OP_ENDPTCTRL + ENDPT_MAX / 2,
68 };
69 
70 /******************************************************************************
71  * STRUCTURES
72  *****************************************************************************/
73 /**
74  * struct ci_hw_ep - endpoint representation
75  * @ep: endpoint structure for gadget drivers
76  * @dir: endpoint direction (TX/RX)
77  * @num: endpoint number
78  * @type: endpoint type
79  * @name: string description of the endpoint
80  * @qh: queue head for this endpoint
81  * @wedge: is the endpoint wedged
82  * @ci: pointer to the controller
83  * @lock: pointer to controller's spinlock
84  * @td_pool: pointer to controller's TD pool
85  */
86 struct ci_hw_ep {
87 	struct usb_ep				ep;
88 	u8					dir;
89 	u8					num;
90 	u8					type;
91 	char					name[16];
92 	struct {
93 		struct list_head	queue;
94 		struct ci_hw_qh		*ptr;
95 		dma_addr_t		dma;
96 	}					qh;
97 	int					wedge;
98 
99 	/* global resources */
100 	struct ci_hdrc				*ci;
101 	spinlock_t				*lock;
102 	struct dma_pool				*td_pool;
103 	struct td_node				*pending_td;
104 };
105 
106 enum ci_role {
107 	CI_ROLE_HOST = 0,
108 	CI_ROLE_GADGET,
109 	CI_ROLE_END,
110 };
111 
112 enum ci_revision {
113 	CI_REVISION_1X = 10,	/* Revision 1.x */
114 	CI_REVISION_20 = 20, /* Revision 2.0 */
115 	CI_REVISION_21, /* Revision 2.1 */
116 	CI_REVISION_22, /* Revision 2.2 */
117 	CI_REVISION_23, /* Revision 2.3 */
118 	CI_REVISION_24, /* Revision 2.4 */
119 	CI_REVISION_25, /* Revision 2.5 */
120 	CI_REVISION_25_PLUS, /* Revision above than 2.5 */
121 	CI_REVISION_UNKNOWN = 99, /* Unknown Revision */
122 };
123 
124 /**
125  * struct ci_role_driver - host/gadget role driver
126  * @start: start this role
127  * @stop: stop this role
128  * @irq: irq handler for this role
129  * @name: role name string (host/gadget)
130  */
131 struct ci_role_driver {
132 	int		(*start)(struct ci_hdrc *);
133 	void		(*stop)(struct ci_hdrc *);
134 	irqreturn_t	(*irq)(struct ci_hdrc *);
135 	const char	*name;
136 };
137 
138 /**
139  * struct hw_bank - hardware register mapping representation
140  * @lpm: set if the device is LPM capable
141  * @phys: physical address of the controller's registers
142  * @abs: absolute address of the beginning of register window
143  * @cap: capability registers
144  * @op: operational registers
145  * @size: size of the register window
146  * @regmap: register lookup table
147  */
148 struct hw_bank {
149 	unsigned	lpm;
150 	resource_size_t	phys;
151 	void __iomem	*abs;
152 	void __iomem	*cap;
153 	void __iomem	*op;
154 	size_t		size;
155 	void __iomem	*regmap[OP_LAST + 1];
156 };
157 
158 /**
159  * struct ci_hdrc - chipidea device representation
160  * @dev: pointer to parent device
161  * @lock: access synchronization
162  * @hw_bank: hardware register mapping
163  * @irq: IRQ number
164  * @roles: array of supported roles for this controller
165  * @role: current role
166  * @is_otg: if the device is otg-capable
167  * @fsm: otg finite state machine
168  * @otg_fsm_hrtimer: hrtimer for otg fsm timers
169  * @hr_timeouts: time out list for active otg fsm timers
170  * @enabled_otg_timer_bits: bits of enabled otg timers
171  * @next_otg_timer: next nearest enabled timer to be expired
172  * @work: work for role changing
173  * @wq: workqueue thread
174  * @qh_pool: allocation pool for queue heads
175  * @td_pool: allocation pool for transfer descriptors
176  * @gadget: device side representation for peripheral controller
177  * @driver: gadget driver
178  * @resume_state: save the state of gadget suspend from
179  * @hw_ep_max: total number of endpoints supported by hardware
180  * @ci_hw_ep: array of endpoints
181  * @ep0_dir: ep0 direction
182  * @ep0out: pointer to ep0 OUT endpoint
183  * @ep0in: pointer to ep0 IN endpoint
184  * @status: ep0 status request
185  * @setaddr: if we should set the address on status completion
186  * @address: usb address received from the host
187  * @remote_wakeup: host-enabled remote wakeup
188  * @suspended: suspended by host
189  * @test_mode: the selected test mode
190  * @platdata: platform specific information supplied by parent device
191  * @vbus_active: is VBUS active
192  * @ulpi: pointer to ULPI device, if any
193  * @ulpi_ops: ULPI read/write ops for this device
194  * @phy: pointer to PHY, if any
195  * @usb_phy: pointer to USB PHY, if any and if using the USB PHY framework
196  * @hcd: pointer to usb_hcd for ehci host driver
197  * @debugfs: root dentry for this controller in debugfs
198  * @id_event: indicates there is an id event, and handled at ci_otg_work
199  * @b_sess_valid_event: indicates there is a vbus event, and handled
200  * at ci_otg_work
201  * @imx28_write_fix: Freescale imx28 needs swp instruction for writing
202  * @supports_runtime_pm: if runtime pm is supported
203  * @in_lpm: if the core in low power mode
204  * @wakeup_int: if wakeup interrupt occur
205  * @rev: The revision number for controller
206  */
207 struct ci_hdrc {
208 	struct device			*dev;
209 	spinlock_t			lock;
210 	struct hw_bank			hw_bank;
211 	int				irq;
212 	struct ci_role_driver		*roles[CI_ROLE_END];
213 	enum ci_role			role;
214 	bool				is_otg;
215 	struct usb_otg			otg;
216 	struct otg_fsm			fsm;
217 	struct hrtimer			otg_fsm_hrtimer;
218 	ktime_t				hr_timeouts[NUM_OTG_FSM_TIMERS];
219 	unsigned			enabled_otg_timer_bits;
220 	enum otg_fsm_timer		next_otg_timer;
221 	struct usb_role_switch		*role_switch;
222 	struct work_struct		work;
223 	struct workqueue_struct		*wq;
224 
225 	struct dma_pool			*qh_pool;
226 	struct dma_pool			*td_pool;
227 
228 	struct usb_gadget		gadget;
229 	struct usb_gadget_driver	*driver;
230 	enum usb_device_state		resume_state;
231 	unsigned			hw_ep_max;
232 	struct ci_hw_ep			ci_hw_ep[ENDPT_MAX];
233 	u32				ep0_dir;
234 	struct ci_hw_ep			*ep0out, *ep0in;
235 
236 	struct usb_request		*status;
237 	bool				setaddr;
238 	u8				address;
239 	u8				remote_wakeup;
240 	u8				suspended;
241 	u8				test_mode;
242 
243 	struct ci_hdrc_platform_data	*platdata;
244 	int				vbus_active;
245 	struct ulpi			*ulpi;
246 	struct ulpi_ops 		ulpi_ops;
247 	struct phy			*phy;
248 	/* old usb_phy interface */
249 	struct usb_phy			*usb_phy;
250 	struct usb_hcd			*hcd;
251 	struct dentry			*debugfs;
252 	bool				id_event;
253 	bool				b_sess_valid_event;
254 	bool				imx28_write_fix;
255 	bool				supports_runtime_pm;
256 	bool				in_lpm;
257 	bool				wakeup_int;
258 	enum ci_revision		rev;
259 };
260 
261 static inline struct ci_role_driver *ci_role(struct ci_hdrc *ci)
262 {
263 	BUG_ON(ci->role >= CI_ROLE_END || !ci->roles[ci->role]);
264 	return ci->roles[ci->role];
265 }
266 
267 static inline int ci_role_start(struct ci_hdrc *ci, enum ci_role role)
268 {
269 	int ret;
270 
271 	if (role >= CI_ROLE_END)
272 		return -EINVAL;
273 
274 	if (!ci->roles[role])
275 		return -ENXIO;
276 
277 	ret = ci->roles[role]->start(ci);
278 	if (!ret)
279 		ci->role = role;
280 	return ret;
281 }
282 
283 static inline void ci_role_stop(struct ci_hdrc *ci)
284 {
285 	enum ci_role role = ci->role;
286 
287 	if (role == CI_ROLE_END)
288 		return;
289 
290 	ci->role = CI_ROLE_END;
291 
292 	ci->roles[role]->stop(ci);
293 }
294 
295 static inline enum usb_role ci_role_to_usb_role(struct ci_hdrc *ci)
296 {
297 	if (ci->role == CI_ROLE_HOST)
298 		return USB_ROLE_HOST;
299 	else if (ci->role == CI_ROLE_GADGET && ci->vbus_active)
300 		return USB_ROLE_DEVICE;
301 	else
302 		return USB_ROLE_NONE;
303 }
304 
305 static inline enum ci_role usb_role_to_ci_role(enum usb_role role)
306 {
307 	if (role == USB_ROLE_HOST)
308 		return CI_ROLE_HOST;
309 	else if (role == USB_ROLE_DEVICE)
310 		return CI_ROLE_GADGET;
311 	else
312 		return CI_ROLE_END;
313 }
314 
315 /**
316  * hw_read_id_reg: reads from a identification register
317  * @ci: the controller
318  * @offset: offset from the beginning of identification registers region
319  * @mask: bitfield mask
320  *
321  * This function returns register contents
322  */
323 static inline u32 hw_read_id_reg(struct ci_hdrc *ci, u32 offset, u32 mask)
324 {
325 	return ioread32(ci->hw_bank.abs + offset) & mask;
326 }
327 
328 /**
329  * hw_write_id_reg: writes to a identification register
330  * @ci: the controller
331  * @offset: offset from the beginning of identification registers region
332  * @mask: bitfield mask
333  * @data: new value
334  */
335 static inline void hw_write_id_reg(struct ci_hdrc *ci, u32 offset,
336 			    u32 mask, u32 data)
337 {
338 	if (~mask)
339 		data = (ioread32(ci->hw_bank.abs + offset) & ~mask)
340 			| (data & mask);
341 
342 	iowrite32(data, ci->hw_bank.abs + offset);
343 }
344 
345 /**
346  * hw_read: reads from a hw register
347  * @ci: the controller
348  * @reg:  register index
349  * @mask: bitfield mask
350  *
351  * This function returns register contents
352  */
353 static inline u32 hw_read(struct ci_hdrc *ci, enum ci_hw_regs reg, u32 mask)
354 {
355 	return ioread32(ci->hw_bank.regmap[reg]) & mask;
356 }
357 
358 #ifdef CONFIG_SOC_IMX28
359 static inline void imx28_ci_writel(u32 val, volatile void __iomem *addr)
360 {
361 	__asm__ ("swp %0, %0, [%1]" : : "r"(val), "r"(addr));
362 }
363 #else
364 static inline void imx28_ci_writel(u32 val, volatile void __iomem *addr)
365 {
366 }
367 #endif
368 
369 static inline void __hw_write(struct ci_hdrc *ci, u32 val,
370 		void __iomem *addr)
371 {
372 	if (ci->imx28_write_fix)
373 		imx28_ci_writel(val, addr);
374 	else
375 		iowrite32(val, addr);
376 }
377 
378 /**
379  * hw_write: writes to a hw register
380  * @ci: the controller
381  * @reg:  register index
382  * @mask: bitfield mask
383  * @data: new value
384  */
385 static inline void hw_write(struct ci_hdrc *ci, enum ci_hw_regs reg,
386 			    u32 mask, u32 data)
387 {
388 	if (~mask)
389 		data = (ioread32(ci->hw_bank.regmap[reg]) & ~mask)
390 			| (data & mask);
391 
392 	__hw_write(ci, data, ci->hw_bank.regmap[reg]);
393 }
394 
395 /**
396  * hw_test_and_clear: tests & clears a hw register
397  * @ci: the controller
398  * @reg:  register index
399  * @mask: bitfield mask
400  *
401  * This function returns register contents
402  */
403 static inline u32 hw_test_and_clear(struct ci_hdrc *ci, enum ci_hw_regs reg,
404 				    u32 mask)
405 {
406 	u32 val = ioread32(ci->hw_bank.regmap[reg]) & mask;
407 
408 	__hw_write(ci, val, ci->hw_bank.regmap[reg]);
409 	return val;
410 }
411 
412 /**
413  * hw_test_and_write: tests & writes a hw register
414  * @ci: the controller
415  * @reg:  register index
416  * @mask: bitfield mask
417  * @data: new value
418  *
419  * This function returns register contents
420  */
421 static inline u32 hw_test_and_write(struct ci_hdrc *ci, enum ci_hw_regs reg,
422 				    u32 mask, u32 data)
423 {
424 	u32 val = hw_read(ci, reg, ~0);
425 
426 	hw_write(ci, reg, mask, data);
427 	return (val & mask) >> __ffs(mask);
428 }
429 
430 /**
431  * ci_otg_is_fsm_mode: runtime check if otg controller
432  * is in otg fsm mode.
433  *
434  * @ci: chipidea device
435  */
436 static inline bool ci_otg_is_fsm_mode(struct ci_hdrc *ci)
437 {
438 #ifdef CONFIG_USB_OTG_FSM
439 	struct usb_otg_caps *otg_caps = &ci->platdata->ci_otg_caps;
440 
441 	return ci->is_otg && ci->roles[CI_ROLE_HOST] &&
442 		ci->roles[CI_ROLE_GADGET] && (otg_caps->srp_support ||
443 		otg_caps->hnp_support || otg_caps->adp_support);
444 #else
445 	return false;
446 #endif
447 }
448 
449 int ci_ulpi_init(struct ci_hdrc *ci);
450 void ci_ulpi_exit(struct ci_hdrc *ci);
451 int ci_ulpi_resume(struct ci_hdrc *ci);
452 
453 u32 hw_read_intr_enable(struct ci_hdrc *ci);
454 
455 u32 hw_read_intr_status(struct ci_hdrc *ci);
456 
457 int hw_device_reset(struct ci_hdrc *ci);
458 
459 int hw_port_test_set(struct ci_hdrc *ci, u8 mode);
460 
461 u8 hw_port_test_get(struct ci_hdrc *ci);
462 
463 void hw_phymode_configure(struct ci_hdrc *ci);
464 
465 void ci_platform_configure(struct ci_hdrc *ci);
466 
467 void dbg_create_files(struct ci_hdrc *ci);
468 
469 void dbg_remove_files(struct ci_hdrc *ci);
470 #endif	/* __DRIVERS_USB_CHIPIDEA_CI_H */
471