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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 * @debugfs: root dentry for this controller in debugfs
199 * @id_event: indicates there is an id event, and handled at ci_otg_work
200 * @b_sess_valid_event: indicates there is a vbus event, and handled
201 * at ci_otg_work
202 * @imx28_write_fix: Freescale imx28 needs swp instruction for writing
203 * @supports_runtime_pm: if runtime pm is supported
204 * @in_lpm: if the core in low power mode
205 * @wakeup_int: if wakeup interrupt occur
206 * @rev: The revision number for controller
207 */
208struct ci_hdrc {
209 struct device *dev;
210 spinlock_t lock;
211 struct hw_bank hw_bank;
212 int irq;
213 struct ci_role_driver *roles[CI_ROLE_END];
214 enum ci_role role;
215 bool is_otg;
216 struct usb_otg otg;
217 struct otg_fsm fsm;
218 struct hrtimer otg_fsm_hrtimer;
219 ktime_t hr_timeouts[NUM_OTG_FSM_TIMERS];
220 unsigned enabled_otg_timer_bits;
221 enum otg_fsm_timer next_otg_timer;
222 struct usb_role_switch *role_switch;
223 struct work_struct work;
224 struct workqueue_struct *wq;
225
226 struct dma_pool *qh_pool;
227 struct dma_pool *td_pool;
228
229 struct usb_gadget gadget;
230 struct usb_gadget_driver *driver;
231 enum usb_device_state resume_state;
232 unsigned hw_ep_max;
233 struct ci_hw_ep ci_hw_ep[ENDPT_MAX];
234 u32 ep0_dir;
235 struct ci_hw_ep *ep0out, *ep0in;
236
237 struct usb_request *status;
238 bool setaddr;
239 u8 address;
240 u8 remote_wakeup;
241 u8 suspended;
242 u8 test_mode;
243
244 struct ci_hdrc_platform_data *platdata;
245 int vbus_active;
246 struct ulpi *ulpi;
247 struct ulpi_ops ulpi_ops;
248 struct phy *phy;
249 /* old usb_phy interface */
250 struct usb_phy *usb_phy;
251 struct usb_hcd *hcd;
252 struct dentry *debugfs;
253 bool id_event;
254 bool b_sess_valid_event;
255 bool imx28_write_fix;
256 bool supports_runtime_pm;
257 bool in_lpm;
258 bool wakeup_int;
259 enum ci_revision rev;
260};
261
262static inline struct ci_role_driver *ci_role(struct ci_hdrc *ci)
263{
264 BUG_ON(ci->role >= CI_ROLE_END || !ci->roles[ci->role]);
265 return ci->roles[ci->role];
266}
267
268static inline int ci_role_start(struct ci_hdrc *ci, enum ci_role role)
269{
270 int ret;
271
272 if (role >= CI_ROLE_END)
273 return -EINVAL;
274
275 if (!ci->roles[role])
276 return -ENXIO;
277
278 ret = ci->roles[role]->start(ci);
279 if (!ret)
280 ci->role = role;
281 return ret;
282}
283
284static inline void ci_role_stop(struct ci_hdrc *ci)
285{
286 enum ci_role role = ci->role;
287
288 if (role == CI_ROLE_END)
289 return;
290
291 ci->role = CI_ROLE_END;
292
293 ci->roles[role]->stop(ci);
294}
295
296static inline enum usb_role ci_role_to_usb_role(struct ci_hdrc *ci)
297{
298 if (ci->role == CI_ROLE_HOST)
299 return USB_ROLE_HOST;
300 else if (ci->role == CI_ROLE_GADGET && ci->vbus_active)
301 return USB_ROLE_DEVICE;
302 else
303 return USB_ROLE_NONE;
304}
305
306static inline enum ci_role usb_role_to_ci_role(enum usb_role role)
307{
308 if (role == USB_ROLE_HOST)
309 return CI_ROLE_HOST;
310 else if (role == USB_ROLE_DEVICE)
311 return CI_ROLE_GADGET;
312 else
313 return CI_ROLE_END;
314}
315
316/**
317 * hw_read_id_reg: reads from a identification register
318 * @ci: the controller
319 * @offset: offset from the beginning of identification registers region
320 * @mask: bitfield mask
321 *
322 * This function returns register contents
323 */
324static inline u32 hw_read_id_reg(struct ci_hdrc *ci, u32 offset, u32 mask)
325{
326 return ioread32(ci->hw_bank.abs + offset) & mask;
327}
328
329/**
330 * hw_write_id_reg: writes to a identification register
331 * @ci: the controller
332 * @offset: offset from the beginning of identification registers region
333 * @mask: bitfield mask
334 * @data: new value
335 */
336static inline void hw_write_id_reg(struct ci_hdrc *ci, u32 offset,
337 u32 mask, u32 data)
338{
339 if (~mask)
340 data = (ioread32(ci->hw_bank.abs + offset) & ~mask)
341 | (data & mask);
342
343 iowrite32(data, ci->hw_bank.abs + offset);
344}
345
346/**
347 * hw_read: reads from a hw register
348 * @ci: the controller
349 * @reg: register index
350 * @mask: bitfield mask
351 *
352 * This function returns register contents
353 */
354static inline u32 hw_read(struct ci_hdrc *ci, enum ci_hw_regs reg, u32 mask)
355{
356 return ioread32(ci->hw_bank.regmap[reg]) & mask;
357}
358
359#ifdef CONFIG_SOC_IMX28
360static inline void imx28_ci_writel(u32 val, volatile void __iomem *addr)
361{
362 __asm__ ("swp %0, %0, [%1]" : : "r"(val), "r"(addr));
363}
364#else
365static inline void imx28_ci_writel(u32 val, volatile void __iomem *addr)
366{
367}
368#endif
369
370static inline void __hw_write(struct ci_hdrc *ci, u32 val,
371 void __iomem *addr)
372{
373 if (ci->imx28_write_fix)
374 imx28_ci_writel(val, addr);
375 else
376 iowrite32(val, addr);
377}
378
379/**
380 * hw_write: writes to a hw register
381 * @ci: the controller
382 * @reg: register index
383 * @mask: bitfield mask
384 * @data: new value
385 */
386static inline void hw_write(struct ci_hdrc *ci, enum ci_hw_regs reg,
387 u32 mask, u32 data)
388{
389 if (~mask)
390 data = (ioread32(ci->hw_bank.regmap[reg]) & ~mask)
391 | (data & mask);
392
393 __hw_write(ci, data, ci->hw_bank.regmap[reg]);
394}
395
396/**
397 * hw_test_and_clear: tests & clears a hw register
398 * @ci: the controller
399 * @reg: register index
400 * @mask: bitfield mask
401 *
402 * This function returns register contents
403 */
404static inline u32 hw_test_and_clear(struct ci_hdrc *ci, enum ci_hw_regs reg,
405 u32 mask)
406{
407 u32 val = ioread32(ci->hw_bank.regmap[reg]) & mask;
408
409 __hw_write(ci, val, ci->hw_bank.regmap[reg]);
410 return val;
411}
412
413/**
414 * hw_test_and_write: tests & writes a hw register
415 * @ci: the controller
416 * @reg: register index
417 * @mask: bitfield mask
418 * @data: new value
419 *
420 * This function returns register contents
421 */
422static inline u32 hw_test_and_write(struct ci_hdrc *ci, enum ci_hw_regs reg,
423 u32 mask, u32 data)
424{
425 u32 val = hw_read(ci, reg, ~0);
426
427 hw_write(ci, reg, mask, data);
428 return (val & mask) >> __ffs(mask);
429}
430
431/**
432 * ci_otg_is_fsm_mode: runtime check if otg controller
433 * is in otg fsm mode.
434 *
435 * @ci: chipidea device
436 */
437static inline bool ci_otg_is_fsm_mode(struct ci_hdrc *ci)
438{
439#ifdef CONFIG_USB_OTG_FSM
440 struct usb_otg_caps *otg_caps = &ci->platdata->ci_otg_caps;
441
442 return ci->is_otg && ci->roles[CI_ROLE_HOST] &&
443 ci->roles[CI_ROLE_GADGET] && (otg_caps->srp_support ||
444 otg_caps->hnp_support || otg_caps->adp_support);
445#else
446 return false;
447#endif
448}
449
450int ci_ulpi_init(struct ci_hdrc *ci);
451void ci_ulpi_exit(struct ci_hdrc *ci);
452int ci_ulpi_resume(struct ci_hdrc *ci);
453
454u32 hw_read_intr_enable(struct ci_hdrc *ci);
455
456u32 hw_read_intr_status(struct ci_hdrc *ci);
457
458int hw_device_reset(struct ci_hdrc *ci);
459
460int hw_port_test_set(struct ci_hdrc *ci, u8 mode);
461
462u8 hw_port_test_get(struct ci_hdrc *ci);
463
464void hw_phymode_configure(struct ci_hdrc *ci);
465
466void ci_platform_configure(struct ci_hdrc *ci);
467
468void dbg_create_files(struct ci_hdrc *ci);
469
470void dbg_remove_files(struct ci_hdrc *ci);
471#endif /* __DRIVERS_USB_CHIPIDEA_CI_H */