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