summaryrefslogtreecommitdiffstats
path: root/drivers/usb/mtu3/mtu3.h
blob: 2cd00a24afd975ab610d046ba2fc4785b63e6d36 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
// SPDX-License-Identifier: GPL-2.0
/*
 * mtu3.h - MediaTek USB3 DRD header
 *
 * Copyright (C) 2016 MediaTek Inc.
 *
 * Author: Chunfeng Yun <chunfeng.yun@mediatek.com>
 */

#ifndef __MTU3_H__
#define __MTU3_H__

#include <linux/device.h>
#include <linux/dmapool.h>
#include <linux/extcon.h>
#include <linux/interrupt.h>
#include <linux/list.h>
#include <linux/phy/phy.h>
#include <linux/regulator/consumer.h>
#include <linux/usb.h>
#include <linux/usb/ch9.h>
#include <linux/usb/gadget.h>
#include <linux/usb/otg.h>

struct mtu3;
struct mtu3_ep;
struct mtu3_request;

#include "mtu3_hw_regs.h"
#include "mtu3_qmu.h"

#define	MU3D_EP_TXCR0(epnum)	(U3D_TX1CSR0 + (((epnum) - 1) * 0x10))
#define	MU3D_EP_TXCR1(epnum)	(U3D_TX1CSR1 + (((epnum) - 1) * 0x10))
#define	MU3D_EP_TXCR2(epnum)	(U3D_TX1CSR2 + (((epnum) - 1) * 0x10))

#define	MU3D_EP_RXCR0(epnum)	(U3D_RX1CSR0 + (((epnum) - 1) * 0x10))
#define	MU3D_EP_RXCR1(epnum)	(U3D_RX1CSR1 + (((epnum) - 1) * 0x10))
#define	MU3D_EP_RXCR2(epnum)	(U3D_RX1CSR2 + (((epnum) - 1) * 0x10))

#define USB_QMU_TQHIAR(epnum)	(U3D_TXQHIAR1 + (((epnum) - 1) * 0x4))
#define USB_QMU_RQHIAR(epnum)	(U3D_RXQHIAR1 + (((epnum) - 1) * 0x4))

#define USB_QMU_RQCSR(epnum)	(U3D_RXQCSR1 + (((epnum) - 1) * 0x10))
#define USB_QMU_RQSAR(epnum)	(U3D_RXQSAR1 + (((epnum) - 1) * 0x10))
#define USB_QMU_RQCPR(epnum)	(U3D_RXQCPR1 + (((epnum) - 1) * 0x10))

#define USB_QMU_TQCSR(epnum)	(U3D_TXQCSR1 + (((epnum) - 1) * 0x10))
#define USB_QMU_TQSAR(epnum)	(U3D_TXQSAR1 + (((epnum) - 1) * 0x10))
#define USB_QMU_TQCPR(epnum)	(U3D_TXQCPR1 + (((epnum) - 1) * 0x10))

#define SSUSB_U3_CTRL(p)	(U3D_SSUSB_U3_CTRL_0P + ((p) * 0x08))
#define SSUSB_U2_CTRL(p)	(U3D_SSUSB_U2_CTRL_0P + ((p) * 0x08))

#define MTU3_DRIVER_NAME	"mtu3"
#define	DMA_ADDR_INVALID	(~(dma_addr_t)0)

#define MTU3_EP_ENABLED		BIT(0)
#define MTU3_EP_STALL		BIT(1)
#define MTU3_EP_WEDGE		BIT(2)
#define MTU3_EP_BUSY		BIT(3)

#define MTU3_U3_IP_SLOT_DEFAULT 2
#define MTU3_U2_IP_SLOT_DEFAULT 1

/**
 * Normally the device works on HS or SS, to simplify fifo management,
 * devide fifo into some 512B parts, use bitmap to manage it; And
 * 128 bits size of bitmap is large enough, that means it can manage
 * up to 64KB fifo size.
 * NOTE: MTU3_EP_FIFO_UNIT should be power of two
 */
#define MTU3_EP_FIFO_UNIT		(1 << 9)
#define MTU3_FIFO_BIT_SIZE		128
#define MTU3_U2_IP_EP0_FIFO_SIZE	64

/**
 * Maximum size of ep0 response buffer for ch9 requests,
 * the SET_SEL request uses 6 so far, and GET_STATUS is 2
 */
#define EP0_RESPONSE_BUF  6

/* device operated link and speed got from DEVICE_CONF register */
enum mtu3_speed {
	MTU3_SPEED_INACTIVE = 0,
	MTU3_SPEED_FULL = 1,
	MTU3_SPEED_HIGH = 3,
	MTU3_SPEED_SUPER = 4,
	MTU3_SPEED_SUPER_PLUS = 5,
};

/**
 * @MU3D_EP0_STATE_SETUP: waits for SETUP or received a SETUP
 *		without data stage.
 * @MU3D_EP0_STATE_TX: IN data stage
 * @MU3D_EP0_STATE_RX: OUT data stage
 * @MU3D_EP0_STATE_TX_END: the last IN data is transferred, and
 *		waits for its completion interrupt
 * @MU3D_EP0_STATE_STALL: ep0 is in stall status, will be auto-cleared
 *		after receives a SETUP.
 */
enum mtu3_g_ep0_state {
	MU3D_EP0_STATE_SETUP = 1,
	MU3D_EP0_STATE_TX,
	MU3D_EP0_STATE_RX,
	MU3D_EP0_STATE_TX_END,
	MU3D_EP0_STATE_STALL,
};

/**
 * MTU3_DR_FORCE_NONE: automatically switch host and periperal mode
 *		by IDPIN signal.
 * MTU3_DR_FORCE_HOST: force to enter host mode and override OTG
 *		IDPIN signal.
 * MTU3_DR_FORCE_DEVICE: force to enter peripheral mode.
 */
enum mtu3_dr_force_mode {
	MTU3_DR_FORCE_NONE = 0,
	MTU3_DR_FORCE_HOST,
	MTU3_DR_FORCE_DEVICE,
};

/**
 * @base: the base address of fifo
 * @limit: the bitmap size in bits
 * @bitmap: fifo bitmap in unit of @MTU3_EP_FIFO_UNIT
 */
struct mtu3_fifo_info {
	u32 base;
	u32 limit;
	DECLARE_BITMAP(bitmap, MTU3_FIFO_BIT_SIZE);
};

/**
 * General Purpose Descriptor (GPD):
 *	The format of TX GPD is a little different from RX one.
 *	And the size of GPD is 16 bytes.
 *
 * @flag:
 *	bit0: Hardware Own (HWO)
 *	bit1: Buffer Descriptor Present (BDP), always 0, BD is not supported
 *	bit2: Bypass (BPS), 1: HW skips this GPD if HWO = 1
 *	bit7: Interrupt On Completion (IOC)
 * @chksum: This is used to validate the contents of this GPD;
 *	If TXQ_CS_EN / RXQ_CS_EN bit is set, an interrupt is issued
 *	when checksum validation fails;
 *	Checksum value is calculated over the 16 bytes of the GPD by default;
 * @data_buf_len (RX ONLY): This value indicates the length of
 *	the assigned data buffer
 * @tx_ext_addr (TX ONLY): [3:0] are 4 extension bits of @buffer,
 *	[7:4] are 4 extension bits of @next_gpd
 * @next_gpd: Physical address of the next GPD
 * @buffer: Physical address of the data buffer
 * @buf_len:
 *	(TX): This value indicates the length of the assigned data buffer
 *	(RX): The total length of data received
 * @ext_len: reserved
 * @rx_ext_addr(RX ONLY): [3:0] are 4 extension bits of @buffer,
 *	[7:4] are 4 extension bits of @next_gpd
 * @ext_flag:
 *	bit5 (TX ONLY): Zero Length Packet (ZLP),
 */
struct qmu_gpd {
	__u8 flag;
	__u8 chksum;
	union {
		__le16 data_buf_len;
		__le16 tx_ext_addr;
	};
	__le32 next_gpd;
	__le32 buffer;
	__le16 buf_len;
	union {
		__u8 ext_len;
		__u8 rx_ext_addr;
	};
	__u8 ext_flag;
} __packed;

/**
* dma: physical base address of GPD segment
* start: virtual base address of GPD segment
* end: the last GPD element
* enqueue: the first empty GPD to use
* dequeue: the first completed GPD serviced by ISR
* NOTE: the size of GPD ring should be >= 2
*/
struct mtu3_gpd_ring {
	dma_addr_t dma;
	struct qmu_gpd *start;
	struct qmu_gpd *end;
	struct qmu_gpd *enqueue;
	struct qmu_gpd *dequeue;
};

/**
* @vbus: vbus 5V used by host mode
* @edev: external connector used to detect vbus and iddig changes
* @vbus_nb: notifier for vbus detection
* @vbus_nb: notifier for iddig(idpin) detection
* @extcon_reg_dwork: delay work for extcon notifier register, waiting for
*		xHCI driver initialization, it's necessary for system bootup
*		as device.
* @is_u3_drd: whether port0 supports usb3.0 dual-role device or not
* @manual_drd_enabled: it's true when supports dual-role device by debugfs
*		to switch host/device modes depending on user input.
*/
struct otg_switch_mtk {
	struct regulator *vbus;
	struct extcon_dev *edev;
	struct notifier_block vbus_nb;
	struct notifier_block id_nb;
	struct delayed_work extcon_reg_dwork;
	bool is_u3_drd;
	bool manual_drd_enabled;
};

/**
 * @mac_base: register base address of device MAC, exclude xHCI's
 * @ippc_base: register base address of IP Power and Clock interface (IPPC)
 * @vusb33: usb3.3V shared by device/host IP
 * @sys_clk: system clock of mtu3, shared by device/host IP
 * @ref_clk: reference clock
 * @mcu_clk: mcu_bus_ck clock for AHB bus etc
 * @dma_clk: dma_bus_ck clock for AXI bus etc
 * @dr_mode: works in which mode:
 *		host only, device only or dual-role mode
 * @u2_ports: number of usb2.0 host ports
 * @u3_ports: number of usb3.0 host ports
 * @u3p_dis_msk: mask of disabling usb3 ports, for example, bit0==1 to
 *		disable u3port0, bit1==1 to disable u3port1,... etc
 * @dbgfs_root: only used when supports manual dual-role switch via debugfs
 * @uwk_en: it's true when supports remote wakeup in host mode
 * @uwk: syscon including usb wakeup glue layer between SSUSB IP and SPM
 * @uwk_reg_base: the base address of the wakeup glue layer in @uwk
 * @uwk_vers: the version of the wakeup glue layer
 */
struct ssusb_mtk {
	struct device *dev;
	struct mtu3 *u3d;
	void __iomem *mac_base;
	void __iomem *ippc_base;
	struct phy **phys;
	int num_phys;
	/* common power & clock */
	struct regulator *vusb33;
	struct clk *sys_clk;
	struct clk *ref_clk;
	struct clk *mcu_clk;
	struct clk *dma_clk;
	/* otg */
	struct otg_switch_mtk otg_switch;
	enum usb_dr_mode dr_mode;
	bool is_host;
	int u2_ports;
	int u3_ports;
	int u3p_dis_msk;
	struct dentry *dbgfs_root;
	/* usb wakeup for host mode */
	bool uwk_en;
	struct regmap *uwk;
	u32 uwk_reg_base;
	u32 uwk_vers;
};

/**
 * @fifo_size: it is (@slot + 1) * @fifo_seg_size
 * @fifo_seg_size: it is roundup_pow_of_two(@maxp)
 */
struct mtu3_ep {
	struct usb_ep ep;
	char name[12];
	struct mtu3 *mtu;
	u8 epnum;
	u8 type;
	u8 is_in;
	u16 maxp;
	int slot;
	u32 fifo_size;
	u32 fifo_addr;
	u32 fifo_seg_size;
	struct mtu3_fifo_info *fifo;

	struct list_head req_list;
	struct mtu3_gpd_ring gpd_ring;
	const struct usb_ss_ep_comp_descriptor *comp_desc;
	const struct usb_endpoint_descriptor *desc;

	int flags;
	u8 wedged;
	u8 busy;
};

struct mtu3_request {
	struct usb_request request;
	struct list_head list;
	struct mtu3_ep *mep;
	struct mtu3 *mtu;
	struct qmu_gpd *gpd;
	int epnum;
};

static inline struct ssusb_mtk *dev_to_ssusb(struct device *dev)
{
	return dev_get_drvdata(dev);
}

/**
 * struct mtu3 - device driver instance data.
 * @slot: MTU3_U2_IP_SLOT_DEFAULT for U2 IP only,
 *		MTU3_U3_IP_SLOT_DEFAULT for U3 IP
 * @may_wakeup: means device's remote wakeup is enabled
 * @is_self_powered: is reported in device status and the config descriptor
 * @delayed_status: true when function drivers ask for delayed status
 * @ep0_req: dummy request used while handling standard USB requests
 *		for GET_STATUS and SET_SEL
 * @setup_buf: ep0 response buffer for GET_STATUS and SET_SEL requests
 */
struct mtu3 {
	spinlock_t lock;
	struct ssusb_mtk *ssusb;
	struct device *dev;
	void __iomem *mac_base;
	void __iomem *ippc_base;
	int irq;

	struct mtu3_fifo_info tx_fifo;
	struct mtu3_fifo_info rx_fifo;

	struct mtu3_ep *ep_array;
	struct mtu3_ep *in_eps;
	struct mtu3_ep *out_eps;
	struct mtu3_ep *ep0;
	int num_eps;
	int slot;
	int active_ep;

	struct dma_pool	*qmu_gpd_pool;
	enum mtu3_g_ep0_state ep0_state;
	struct usb_gadget g;	/* the gadget */
	struct usb_gadget_driver *gadget_driver;
	struct mtu3_request ep0_req;
	u8 setup_buf[EP0_RESPONSE_BUF];
	u32 max_speed;

	unsigned is_active:1;
	unsigned may_wakeup:1;
	unsigned is_self_powered:1;
	unsigned test_mode:1;
	unsigned softconnect:1;
	unsigned u1_enable:1;
	unsigned u2_enable:1;
	unsigned is_u3_ip:1;
	unsigned delayed_status:1;

	u8 address;
	u8 test_mode_nr;
	u32 hw_version;
};

static inline struct mtu3 *gadget_to_mtu3(struct usb_gadget *g)
{
	return container_of(g, struct mtu3, g);
}

static inline int is_first_entry(const struct list_head *list,
	const struct list_head *head)
{
	return list_is_last(head, list);
}

static inline struct mtu3_request *to_mtu3_request(struct usb_request *req)
{
	return req ? container_of(req, struct mtu3_request, request) : NULL;
}

static inline struct mtu3_ep *to_mtu3_ep(struct usb_ep *ep)
{
	return ep ? container_of(ep, struct mtu3_ep, ep) : NULL;
}

static inline struct mtu3_request *next_request(struct mtu3_ep *mep)
{
	return list_first_entry_or_null(&mep->req_list, struct mtu3_request,
					list);
}

static inline void mtu3_writel(void __iomem *base, u32 offset, u32 data)
{
	writel(data, base + offset);
}

static inline u32 mtu3_readl(void __iomem *base, u32 offset)
{
	return readl(base + offset);
}

static inline void mtu3_setbits(void __iomem *base, u32 offset, u32 bits)
{
	void __iomem *addr = base + offset;
	u32 tmp = readl(addr);

	writel((tmp | (bits)), addr);
}

static inline void mtu3_clrbits(void __iomem *base, u32 offset, u32 bits)
{
	void __iomem *addr = base + offset;
	u32 tmp = readl(addr);

	writel((tmp & ~(bits)), addr);
}

int ssusb_check_clocks(struct ssusb_mtk *ssusb, u32 ex_clks);
struct usb_request *mtu3_alloc_request(struct usb_ep *ep, gfp_t gfp_flags);
void mtu3_free_request(struct usb_ep *ep, struct usb_request *req);
void mtu3_req_complete(struct mtu3_ep *mep,
		struct usb_request *req, int status);

int mtu3_config_ep(struct mtu3 *mtu, struct mtu3_ep *mep,
		int interval, int burst, int mult);
void mtu3_deconfig_ep(struct mtu3 *mtu, struct mtu3_ep *mep);
void mtu3_ep_stall_set(struct mtu3_ep *mep, bool set);
void mtu3_ep0_setup(struct mtu3 *mtu);
void mtu3_start(struct mtu3 *mtu);
void mtu3_stop(struct mtu3 *mtu);
void mtu3_dev_on_off(struct mtu3 *mtu, int is_on);

int mtu3_gadget_setup(struct mtu3 *mtu);
void mtu3_gadget_cleanup(struct mtu3 *mtu);
void mtu3_gadget_reset(struct mtu3 *mtu);
void mtu3_gadget_suspend(struct mtu3 *mtu);
void mtu3_gadget_resume(struct mtu3 *mtu);
void mtu3_gadget_disconnect(struct mtu3 *mtu);

irqreturn_t mtu3_ep0_isr(struct mtu3 *mtu);
extern const struct usb_ep_ops mtu3_ep0_ops;

#endif