summaryrefslogtreecommitdiffstats
path: root/drivers/usb/gadget/udc/net2280.h
blob: 0d32052bf16f90d5e1ace964cedd484c14a6f65d (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
/*
 * NetChip 2280 high/full speed USB device controller.
 * Unlike many such controllers, this one talks PCI.
 */

/*
 * Copyright (C) 2002 NetChip Technology, Inc. (http://www.netchip.com)
 * Copyright (C) 2003 David Brownell
 * Copyright (C) 2014 Ricardo Ribalda - Qtechnology/AS
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 */

#include <linux/usb/net2280.h>
#include <linux/usb/usb338x.h>

/*-------------------------------------------------------------------------*/

#ifdef	__KERNEL__

/* indexed registers [11.10] are accessed indirectly
 * caller must own the device lock.
 */

static inline u32 get_idx_reg(struct net2280_regs __iomem *regs, u32 index)
{
	writel(index, &regs->idxaddr);
	/* NOTE:  synchs device/cpu memory views */
	return readl(&regs->idxdata);
}

static inline void
set_idx_reg(struct net2280_regs __iomem *regs, u32 index, u32 value)
{
	writel(index, &regs->idxaddr);
	writel(value, &regs->idxdata);
	/* posted, may not be visible yet */
}

#endif	/* __KERNEL__ */

#define PCI_VENDOR_ID_PLX_LEGACY 0x17cc

#define PLX_LEGACY		BIT(0)
#define PLX_2280		BIT(1)
#define PLX_SUPERSPEED		BIT(2)

#define REG_DIAG		0x0
#define     RETRY_COUNTER                                       16
#define     FORCE_PCI_SERR                                      11
#define     FORCE_PCI_INTERRUPT                                 10
#define     FORCE_USB_INTERRUPT                                 9
#define     FORCE_CPU_INTERRUPT                                 8
#define     ILLEGAL_BYTE_ENABLES                                5
#define     FAST_TIMES                                          4
#define     FORCE_RECEIVE_ERROR                                 2
#define     FORCE_TRANSMIT_CRC_ERROR                            0
#define REG_FRAME		0x02	/* from last sof */
#define REG_CHIPREV		0x03	/* in bcd */
#define	REG_HS_NAK_RATE		0x0a	/* NAK per N uframes */

#define	CHIPREV_1	0x0100
#define	CHIPREV_1A	0x0110

/* DEFECT 7374 */
#define DEFECT_7374_NUMBEROF_MAX_WAIT_LOOPS         200
#define DEFECT_7374_PROCESSOR_WAIT_TIME             10

/* ep0 max packet size */
#define EP0_SS_MAX_PACKET_SIZE  0x200
#define EP0_HS_MAX_PACKET_SIZE  0x40
#ifdef	__KERNEL__

/*-------------------------------------------------------------------------*/

/* [8.3] for scatter/gather i/o
 * use struct net2280_dma_regs bitfields
 */
struct net2280_dma {
	__le32		dmacount;
	__le32		dmaaddr;		/* the buffer */
	__le32		dmadesc;		/* next dma descriptor */
	__le32		_reserved;
} __aligned(16);

/*-------------------------------------------------------------------------*/

/* DRIVER DATA STRUCTURES and UTILITIES */

struct net2280_ep {
	struct usb_ep				ep;
	struct net2280_ep_regs __iomem *cfg;
	struct net2280_ep_regs			__iomem *regs;
	struct net2280_dma_regs			__iomem *dma;
	struct net2280_dma			*dummy;
	dma_addr_t				td_dma;	/* of dummy */
	struct net2280				*dev;
	unsigned long				irqs;

	/* analogous to a host-side qh */
	struct list_head			queue;
	const struct usb_endpoint_descriptor	*desc;
	unsigned				num : 8,
						fifo_size : 12,
						in_fifo_validate : 1,
						out_overflow : 1,
						stopped : 1,
						wedged : 1,
						is_in : 1,
						is_iso : 1,
						responded : 1;
};

static inline void allow_status(struct net2280_ep *ep)
{
	/* ep0 only */
	writel(BIT(CLEAR_CONTROL_STATUS_PHASE_HANDSHAKE) |
		BIT(CLEAR_NAK_OUT_PACKETS) |
		BIT(CLEAR_NAK_OUT_PACKETS_MODE),
		&ep->regs->ep_rsp);
	ep->stopped = 1;
}

static inline void allow_status_338x(struct net2280_ep *ep)
{
	/*
	 * Control Status Phase Handshake was set by the chip when the setup
	 * packet arrived. While set, the chip automatically NAKs the host's
	 * Status Phase tokens.
	 */
	writel(BIT(CLEAR_CONTROL_STATUS_PHASE_HANDSHAKE), &ep->regs->ep_rsp);

	ep->stopped = 1;

	/* TD 9.9 Halt Endpoint test.  TD 9.22 set feature test. */
	ep->responded = 0;
}

struct net2280_request {
	struct usb_request		req;
	struct net2280_dma		*td;
	dma_addr_t			td_dma;
	struct list_head		queue;
	unsigned			mapped : 1,
					valid : 1;
};

struct net2280 {
	/* each pci device provides one gadget, several endpoints */
	struct usb_gadget		gadget;
	spinlock_t			lock;
	struct net2280_ep		ep[9];
	struct usb_gadget_driver	*driver;
	unsigned			enabled : 1,
					protocol_stall : 1,
					softconnect : 1,
					got_irq : 1,
					region:1,
					u1_enable:1,
					u2_enable:1,
					ltm_enable:1,
					wakeup_enable:1,
					addressed_state:1,
					bug7734_patched:1;
	u16				chiprev;
	int enhanced_mode;
	int n_ep;
	kernel_ulong_t			quirks;


	/* pci state used to access those endpoints */
	struct pci_dev			*pdev;
	struct net2280_regs		__iomem *regs;
	struct net2280_usb_regs		__iomem *usb;
	struct usb338x_usb_ext_regs	__iomem *usb_ext;
	struct net2280_pci_regs		__iomem *pci;
	struct net2280_dma_regs		__iomem *dma;
	struct net2280_dep_regs		__iomem *dep;
	struct net2280_ep_regs		__iomem *epregs;
	struct usb338x_ll_regs		__iomem *llregs;
	struct usb338x_ll_lfps_regs	__iomem *ll_lfps_regs;
	struct usb338x_ll_tsn_regs	__iomem *ll_tsn_regs;
	struct usb338x_ll_chi_regs	__iomem *ll_chicken_reg;
	struct usb338x_pl_regs		__iomem *plregs;

	struct pci_pool			*requests;
	/* statistics...*/
};

static inline void set_halt(struct net2280_ep *ep)
{
	/* ep0 and bulk/intr endpoints */
	writel(BIT(CLEAR_CONTROL_STATUS_PHASE_HANDSHAKE) |
		/* set NAK_OUT for erratum 0114 */
		((ep->dev->chiprev == CHIPREV_1) << SET_NAK_OUT_PACKETS) |
		BIT(SET_ENDPOINT_HALT),
		&ep->regs->ep_rsp);
}

static inline void clear_halt(struct net2280_ep *ep)
{
	/* ep0 and bulk/intr endpoints */
	writel(BIT(CLEAR_ENDPOINT_HALT) |
		BIT(CLEAR_ENDPOINT_TOGGLE) |
		    /*
		     * unless the gadget driver left a short packet in the
		     * fifo, this reverses the erratum 0114 workaround.
		     */
		((ep->dev->chiprev == CHIPREV_1) << CLEAR_NAK_OUT_PACKETS),
		&ep->regs->ep_rsp);
}

/*
 * FSM value for Defect 7374 (U1U2 Test) is managed in
 * chip's SCRATCH register:
 */
#define DEFECT7374_FSM_FIELD    28

/* Waiting for Control Read:
 *  - A transition to this state indicates a fresh USB connection,
 *    before the first Setup Packet. The connection speed is not
 *    known. Firmware is waiting for the first Control Read.
 *  - Starting state: This state can be thought of as the FSM's typical
 *    starting state.
 *  - Tip: Upon the first SS Control Read the FSM never
 *    returns to this state.
 */
#define DEFECT7374_FSM_WAITING_FOR_CONTROL_READ BIT(DEFECT7374_FSM_FIELD)

/* Non-SS Control Read:
 *  - A transition to this state indicates detection of the first HS
 *    or FS Control Read.
 *  - Tip: Upon the first SS Control Read the FSM never
 *    returns to this state.
 */
#define	DEFECT7374_FSM_NON_SS_CONTROL_READ (2 << DEFECT7374_FSM_FIELD)

/* SS Control Read:
 *  - A transition to this state indicates detection of the
 *    first SS Control Read.
 *  - This state indicates workaround completion. Workarounds no longer
 *    need to be applied (as long as the chip remains powered up).
 *  - Tip: Once in this state the FSM state does not change (until
 *    the chip's power is lost and restored).
 *  - This can be thought of as the final state of the FSM;
 *    the FSM 'locks-up' in this state until the chip loses power.
 */
#define DEFECT7374_FSM_SS_CONTROL_READ (3 << DEFECT7374_FSM_FIELD)

#ifdef USE_RDK_LEDS

static inline void net2280_led_init(struct net2280 *dev)
{
	/* LED3 (green) is on during USB activity. note erratum 0113. */
	writel(BIT(GPIO3_LED_SELECT) |
		BIT(GPIO3_OUTPUT_ENABLE) |
		BIT(GPIO2_OUTPUT_ENABLE) |
		BIT(GPIO1_OUTPUT_ENABLE) |
		BIT(GPIO0_OUTPUT_ENABLE),
		&dev->regs->gpioctl);
}

/* indicate speed with bi-color LED 0/1 */
static inline
void net2280_led_speed(struct net2280 *dev, enum usb_device_speed speed)
{
	u32	val = readl(&dev->regs->gpioctl);
	switch (speed) {
	case USB_SPEED_SUPER:		/* green + red */
		val |= BIT(GPIO0_DATA) | BIT(GPIO1_DATA);
		break;
	case USB_SPEED_HIGH:		/* green */
		val &= ~BIT(GPIO0_DATA);
		val |= BIT(GPIO1_DATA);
		break;
	case USB_SPEED_FULL:		/* red */
		val &= ~BIT(GPIO1_DATA);
		val |= BIT(GPIO0_DATA);
		break;
	default:			/* (off/black) */
		val &= ~(BIT(GPIO1_DATA) | BIT(GPIO0_DATA));
		break;
	}
	writel(val, &dev->regs->gpioctl);
}

/* indicate power with LED 2 */
static inline void net2280_led_active(struct net2280 *dev, int is_active)
{
	u32	val = readl(&dev->regs->gpioctl);

	/* FIXME this LED never seems to turn on.*/
	if (is_active)
		val |= GPIO2_DATA;
	else
		val &= ~GPIO2_DATA;
	writel(val, &dev->regs->gpioctl);
}

static inline void net2280_led_shutdown(struct net2280 *dev)
{
	/* turn off all four GPIO*_DATA bits */
	writel(readl(&dev->regs->gpioctl) & ~0x0f,
			&dev->regs->gpioctl);
}

#else

#define net2280_led_init(dev)		do { } while (0)
#define net2280_led_speed(dev, speed)	do { } while (0)
#define net2280_led_shutdown(dev)	do { } while (0)

#endif

/*-------------------------------------------------------------------------*/

#define ep_dbg(ndev, fmt, args...) \
	dev_dbg((&((ndev)->pdev->dev)), fmt, ##args)

#define ep_vdbg(ndev, fmt, args...) \
	dev_vdbg((&((ndev)->pdev->dev)), fmt, ##args)

#define ep_info(ndev, fmt, args...) \
	dev_info((&((ndev)->pdev->dev)), fmt, ##args)

#define ep_warn(ndev, fmt, args...) \
	dev_warn((&((ndev)->pdev->dev)), fmt, ##args)

#define ep_err(ndev, fmt, args...) \
	dev_err((&((ndev)->pdev->dev)), fmt, ##args)

/*-------------------------------------------------------------------------*/

static inline void set_fifo_bytecount(struct net2280_ep *ep, unsigned count)
{
	if (ep->dev->pdev->vendor == 0x17cc)
		writeb(count, 2 + (u8 __iomem *) &ep->regs->ep_cfg);
	else{
		u32 tmp = readl(&ep->cfg->ep_cfg) &
					(~(0x07 << EP_FIFO_BYTE_COUNT));
		writel(tmp | (count << EP_FIFO_BYTE_COUNT), &ep->cfg->ep_cfg);
	}
}

static inline void start_out_naking(struct net2280_ep *ep)
{
	/* NOTE:  hardware races lurk here, and PING protocol issues */
	writel(BIT(SET_NAK_OUT_PACKETS), &ep->regs->ep_rsp);
	/* synch with device */
	readl(&ep->regs->ep_rsp);
}

static inline void stop_out_naking(struct net2280_ep *ep)
{
	u32	tmp;

	tmp = readl(&ep->regs->ep_stat);
	if ((tmp & BIT(NAK_OUT_PACKETS)) != 0)
		writel(BIT(CLEAR_NAK_OUT_PACKETS), &ep->regs->ep_rsp);
}


static inline void set_max_speed(struct net2280_ep *ep, u32 max)
{
	u32 reg;
	static const u32 ep_enhanced[9] = { 0x10, 0x60, 0x30, 0x80,
					  0x50, 0x20, 0x70, 0x40, 0x90 };

	if (ep->dev->enhanced_mode) {
		reg = ep_enhanced[ep->num];
		switch (ep->dev->gadget.speed) {
		case USB_SPEED_SUPER:
			reg += 2;
			break;
		case USB_SPEED_FULL:
			reg += 1;
			break;
		case USB_SPEED_HIGH:
		default:
			break;
		}
	} else {
		reg = (ep->num + 1) * 0x10;
		if (ep->dev->gadget.speed != USB_SPEED_HIGH)
			reg += 1;
	}

	set_idx_reg(ep->dev->regs, reg, max);
}

#endif	/* __KERNEL__ */