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1/*
2 * NetChip 2280 high/full speed USB device controller.
3 * Unlike many such controllers, this one talks PCI.
4 */
5
6/*
7 * Copyright (C) 2002 NetChip Technology, Inc. (http://www.netchip.com)
8 * Copyright (C) 2003 David Brownell
9 *
10 * This program is free software; you can redistribute it and/or modify
11 * it under the terms of the GNU General Public License as published by
12 * the Free Software Foundation; either version 2 of the License, or
13 * (at your option) any later version.
14 */
15
16#include <linux/usb/net2280.h>
17
18/*-------------------------------------------------------------------------*/
19
20#ifdef __KERNEL__
21
22/* indexed registers [11.10] are accessed indirectly
23 * caller must own the device lock.
24 */
25
26static inline u32
27get_idx_reg (struct net2280_regs __iomem *regs, u32 index)
28{
29 writel (index, ®s->idxaddr);
30 /* NOTE: synchs device/cpu memory views */
31 return readl (®s->idxdata);
32}
33
34static inline void
35set_idx_reg (struct net2280_regs __iomem *regs, u32 index, u32 value)
36{
37 writel (index, ®s->idxaddr);
38 writel (value, ®s->idxdata);
39 /* posted, may not be visible yet */
40}
41
42#endif /* __KERNEL__ */
43
44
45#define REG_DIAG 0x0
46#define RETRY_COUNTER 16
47#define FORCE_PCI_SERR 11
48#define FORCE_PCI_INTERRUPT 10
49#define FORCE_USB_INTERRUPT 9
50#define FORCE_CPU_INTERRUPT 8
51#define ILLEGAL_BYTE_ENABLES 5
52#define FAST_TIMES 4
53#define FORCE_RECEIVE_ERROR 2
54#define FORCE_TRANSMIT_CRC_ERROR 0
55#define REG_FRAME 0x02 /* from last sof */
56#define REG_CHIPREV 0x03 /* in bcd */
57#define REG_HS_NAK_RATE 0x0a /* NAK per N uframes */
58
59#define CHIPREV_1 0x0100
60#define CHIPREV_1A 0x0110
61
62#ifdef __KERNEL__
63
64/* ep a-f highspeed and fullspeed maxpacket, addresses
65 * computed from ep->num
66 */
67#define REG_EP_MAXPKT(dev,num) (((num) + 1) * 0x10 + \
68 (((dev)->gadget.speed == USB_SPEED_HIGH) ? 0 : 1))
69
70/*-------------------------------------------------------------------------*/
71
72/* [8.3] for scatter/gather i/o
73 * use struct net2280_dma_regs bitfields
74 */
75struct net2280_dma {
76 __le32 dmacount;
77 __le32 dmaaddr; /* the buffer */
78 __le32 dmadesc; /* next dma descriptor */
79 __le32 _reserved;
80} __attribute__ ((aligned (16)));
81
82/*-------------------------------------------------------------------------*/
83
84/* DRIVER DATA STRUCTURES and UTILITIES */
85
86struct net2280_ep {
87 struct usb_ep ep;
88 struct net2280_ep_regs __iomem *regs;
89 struct net2280_dma_regs __iomem *dma;
90 struct net2280_dma *dummy;
91 dma_addr_t td_dma; /* of dummy */
92 struct net2280 *dev;
93 unsigned long irqs;
94
95 /* analogous to a host-side qh */
96 struct list_head queue;
97 const struct usb_endpoint_descriptor *desc;
98 unsigned num : 8,
99 fifo_size : 12,
100 in_fifo_validate : 1,
101 out_overflow : 1,
102 stopped : 1,
103 wedged : 1,
104 is_in : 1,
105 is_iso : 1,
106 responded : 1;
107};
108
109static inline void allow_status (struct net2280_ep *ep)
110{
111 /* ep0 only */
112 writel ( (1 << CLEAR_CONTROL_STATUS_PHASE_HANDSHAKE)
113 | (1 << CLEAR_NAK_OUT_PACKETS)
114 | (1 << CLEAR_NAK_OUT_PACKETS_MODE)
115 , &ep->regs->ep_rsp);
116 ep->stopped = 1;
117}
118
119/* count (<= 4) bytes in the next fifo write will be valid */
120static inline void set_fifo_bytecount (struct net2280_ep *ep, unsigned count)
121{
122 writeb (count, 2 + (u8 __iomem *) &ep->regs->ep_cfg);
123}
124
125struct net2280_request {
126 struct usb_request req;
127 struct net2280_dma *td;
128 dma_addr_t td_dma;
129 struct list_head queue;
130 unsigned mapped : 1,
131 valid : 1;
132};
133
134struct net2280 {
135 /* each pci device provides one gadget, several endpoints */
136 struct usb_gadget gadget;
137 spinlock_t lock;
138 struct net2280_ep ep [7];
139 struct usb_gadget_driver *driver;
140 unsigned enabled : 1,
141 protocol_stall : 1,
142 softconnect : 1,
143 got_irq : 1,
144 region : 1;
145 u16 chiprev;
146
147 /* pci state used to access those endpoints */
148 struct pci_dev *pdev;
149 struct net2280_regs __iomem *regs;
150 struct net2280_usb_regs __iomem *usb;
151 struct net2280_pci_regs __iomem *pci;
152 struct net2280_dma_regs __iomem *dma;
153 struct net2280_dep_regs __iomem *dep;
154 struct net2280_ep_regs __iomem *epregs;
155
156 struct pci_pool *requests;
157 // statistics...
158};
159
160static inline void set_halt (struct net2280_ep *ep)
161{
162 /* ep0 and bulk/intr endpoints */
163 writel ( (1 << CLEAR_CONTROL_STATUS_PHASE_HANDSHAKE)
164 /* set NAK_OUT for erratum 0114 */
165 | ((ep->dev->chiprev == CHIPREV_1) << SET_NAK_OUT_PACKETS)
166 | (1 << SET_ENDPOINT_HALT)
167 , &ep->regs->ep_rsp);
168}
169
170static inline void clear_halt (struct net2280_ep *ep)
171{
172 /* ep0 and bulk/intr endpoints */
173 writel ( (1 << CLEAR_ENDPOINT_HALT)
174 | (1 << CLEAR_ENDPOINT_TOGGLE)
175 /* unless the gadget driver left a short packet in the
176 * fifo, this reverses the erratum 0114 workaround.
177 */
178 | ((ep->dev->chiprev == CHIPREV_1) << CLEAR_NAK_OUT_PACKETS)
179 , &ep->regs->ep_rsp);
180}
181
182#ifdef USE_RDK_LEDS
183
184static inline void net2280_led_init (struct net2280 *dev)
185{
186 /* LED3 (green) is on during USB activity. note erratum 0113. */
187 writel ((1 << GPIO3_LED_SELECT)
188 | (1 << GPIO3_OUTPUT_ENABLE)
189 | (1 << GPIO2_OUTPUT_ENABLE)
190 | (1 << GPIO1_OUTPUT_ENABLE)
191 | (1 << GPIO0_OUTPUT_ENABLE)
192 , &dev->regs->gpioctl);
193}
194
195/* indicate speed with bi-color LED 0/1 */
196static inline
197void net2280_led_speed (struct net2280 *dev, enum usb_device_speed speed)
198{
199 u32 val = readl (&dev->regs->gpioctl);
200 switch (speed) {
201 case USB_SPEED_HIGH: /* green */
202 val &= ~(1 << GPIO0_DATA);
203 val |= (1 << GPIO1_DATA);
204 break;
205 case USB_SPEED_FULL: /* red */
206 val &= ~(1 << GPIO1_DATA);
207 val |= (1 << GPIO0_DATA);
208 break;
209 default: /* (off/black) */
210 val &= ~((1 << GPIO1_DATA) | (1 << GPIO0_DATA));
211 break;
212 }
213 writel (val, &dev->regs->gpioctl);
214}
215
216/* indicate power with LED 2 */
217static inline void net2280_led_active (struct net2280 *dev, int is_active)
218{
219 u32 val = readl (&dev->regs->gpioctl);
220
221 // FIXME this LED never seems to turn on.
222 if (is_active)
223 val |= GPIO2_DATA;
224 else
225 val &= ~GPIO2_DATA;
226 writel (val, &dev->regs->gpioctl);
227}
228static inline void net2280_led_shutdown (struct net2280 *dev)
229{
230 /* turn off all four GPIO*_DATA bits */
231 writel (readl (&dev->regs->gpioctl) & ~0x0f,
232 &dev->regs->gpioctl);
233}
234
235#else
236
237#define net2280_led_init(dev) do { } while (0)
238#define net2280_led_speed(dev, speed) do { } while (0)
239#define net2280_led_shutdown(dev) do { } while (0)
240
241#endif
242
243/*-------------------------------------------------------------------------*/
244
245#define xprintk(dev,level,fmt,args...) \
246 printk(level "%s %s: " fmt , driver_name , \
247 pci_name(dev->pdev) , ## args)
248
249#ifdef DEBUG
250#undef DEBUG
251#define DEBUG(dev,fmt,args...) \
252 xprintk(dev , KERN_DEBUG , fmt , ## args)
253#else
254#define DEBUG(dev,fmt,args...) \
255 do { } while (0)
256#endif /* DEBUG */
257
258#ifdef VERBOSE
259#define VDEBUG DEBUG
260#else
261#define VDEBUG(dev,fmt,args...) \
262 do { } while (0)
263#endif /* VERBOSE */
264
265#define ERROR(dev,fmt,args...) \
266 xprintk(dev , KERN_ERR , fmt , ## args)
267#define WARNING(dev,fmt,args...) \
268 xprintk(dev , KERN_WARNING , fmt , ## args)
269#define INFO(dev,fmt,args...) \
270 xprintk(dev , KERN_INFO , fmt , ## args)
271
272/*-------------------------------------------------------------------------*/
273
274static inline void start_out_naking (struct net2280_ep *ep)
275{
276 /* NOTE: hardware races lurk here, and PING protocol issues */
277 writel ((1 << SET_NAK_OUT_PACKETS), &ep->regs->ep_rsp);
278 /* synch with device */
279 readl (&ep->regs->ep_rsp);
280}
281
282#ifdef DEBUG
283static inline void assert_out_naking (struct net2280_ep *ep, const char *where)
284{
285 u32 tmp = readl (&ep->regs->ep_stat);
286
287 if ((tmp & (1 << NAK_OUT_PACKETS)) == 0) {
288 DEBUG (ep->dev, "%s %s %08x !NAK\n",
289 ep->ep.name, where, tmp);
290 writel ((1 << SET_NAK_OUT_PACKETS),
291 &ep->regs->ep_rsp);
292 }
293}
294#define ASSERT_OUT_NAKING(ep) assert_out_naking(ep,__func__)
295#else
296#define ASSERT_OUT_NAKING(ep) do {} while (0)
297#endif
298
299static inline void stop_out_naking (struct net2280_ep *ep)
300{
301 u32 tmp;
302
303 tmp = readl (&ep->regs->ep_stat);
304 if ((tmp & (1 << NAK_OUT_PACKETS)) != 0)
305 writel ((1 << CLEAR_NAK_OUT_PACKETS), &ep->regs->ep_rsp);
306}
307
308#endif /* __KERNEL__ */