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 * This program is distributed in the hope that it will be useful,
16 * but WITHOUT ANY WARRANTY; without even the implied warranty of
17 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
18 * GNU General Public License for more details.
19 *
20 * You should have received a copy of the GNU General Public License
21 * along with this program; if not, write to the Free Software
22 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
23 */
24
25 #include <linux/usb/net2280.h>
26
27 /*-------------------------------------------------------------------------*/
28
29 #ifdef __KERNEL__
30
31 /* indexed registers [11.10] are accessed indirectly
32 * caller must own the device lock.
33 */
34
35 static inline u32
36 get_idx_reg (struct net2280_regs __iomem *regs, u32 index)
37 {
38 writel (index, ®s->idxaddr);
39 /* NOTE: synchs device/cpu memory views */
40 return readl (®s->idxdata);
41 }
42
43 static inline void
44 set_idx_reg (struct net2280_regs __iomem *regs, u32 index, u32 value)
45 {
46 writel (index, ®s->idxaddr);
47 writel (value, ®s->idxdata);
48 /* posted, may not be visible yet */
49 }
50
51 #endif /* __KERNEL__ */
52
53
54 #define REG_DIAG 0x0
55 #define RETRY_COUNTER 16
56 #define FORCE_PCI_SERR 11
57 #define FORCE_PCI_INTERRUPT 10
58 #define FORCE_USB_INTERRUPT 9
59 #define FORCE_CPU_INTERRUPT 8
60 #define ILLEGAL_BYTE_ENABLES 5
61 #define FAST_TIMES 4
62 #define FORCE_RECEIVE_ERROR 2
63 #define FORCE_TRANSMIT_CRC_ERROR 0
64 #define REG_FRAME 0x02 /* from last sof */
65 #define REG_CHIPREV 0x03 /* in bcd */
66 #define REG_HS_NAK_RATE 0x0a /* NAK per N uframes */
67
68 #define CHIPREV_1 0x0100
69 #define CHIPREV_1A 0x0110
70
71 #ifdef __KERNEL__
72
73 /* ep a-f highspeed and fullspeed maxpacket, addresses
74 * computed from ep->num
75 */
76 #define REG_EP_MAXPKT(dev,num) (((num) + 1) * 0x10 + \
77 (((dev)->gadget.speed == USB_SPEED_HIGH) ? 0 : 1))
78
79 /*-------------------------------------------------------------------------*/
80
81 /* [8.3] for scatter/gather i/o
82 * use struct net2280_dma_regs bitfields
83 */
84 struct net2280_dma {
85 __le32 dmacount;
86 __le32 dmaaddr; /* the buffer */
87 __le32 dmadesc; /* next dma descriptor */
88 __le32 _reserved;
89 } __attribute__ ((aligned (16)));
90
91 /*-------------------------------------------------------------------------*/
92
93 /* DRIVER DATA STRUCTURES and UTILITIES */
94
95 struct net2280_ep {
96 struct usb_ep ep;
97 struct net2280_ep_regs __iomem *regs;
98 struct net2280_dma_regs __iomem *dma;
99 struct net2280_dma *dummy;
100 dma_addr_t td_dma; /* of dummy */
101 struct net2280 *dev;
102 unsigned long irqs;
103
104 /* analogous to a host-side qh */
105 struct list_head queue;
106 const struct usb_endpoint_descriptor *desc;
107 unsigned num : 8,
108 fifo_size : 12,
109 in_fifo_validate : 1,
110 out_overflow : 1,
111 stopped : 1,
112 wedged : 1,
113 is_in : 1,
114 is_iso : 1,
115 responded : 1;
116 };
117
118 static inline void allow_status (struct net2280_ep *ep)
119 {
120 /* ep0 only */
121 writel ( (1 << CLEAR_CONTROL_STATUS_PHASE_HANDSHAKE)
122 | (1 << CLEAR_NAK_OUT_PACKETS)
123 | (1 << CLEAR_NAK_OUT_PACKETS_MODE)
124 , &ep->regs->ep_rsp);
125 ep->stopped = 1;
126 }
127
128 /* count (<= 4) bytes in the next fifo write will be valid */
129 static inline void set_fifo_bytecount (struct net2280_ep *ep, unsigned count)
130 {
131 writeb (count, 2 + (u8 __iomem *) &ep->regs->ep_cfg);
132 }
133
134 struct net2280_request {
135 struct usb_request req;
136 struct net2280_dma *td;
137 dma_addr_t td_dma;
138 struct list_head queue;
139 unsigned mapped : 1,
140 valid : 1;
141 };
142
143 struct net2280 {
144 /* each pci device provides one gadget, several endpoints */
145 struct usb_gadget gadget;
146 spinlock_t lock;
147 struct net2280_ep ep [7];
148 struct usb_gadget_driver *driver;
149 unsigned enabled : 1,
150 protocol_stall : 1,
151 softconnect : 1,
152 got_irq : 1,
153 region : 1;
154 u16 chiprev;
155
156 /* pci state used to access those endpoints */
157 struct pci_dev *pdev;
158 struct net2280_regs __iomem *regs;
159 struct net2280_usb_regs __iomem *usb;
160 struct net2280_pci_regs __iomem *pci;
161 struct net2280_dma_regs __iomem *dma;
162 struct net2280_dep_regs __iomem *dep;
163 struct net2280_ep_regs __iomem *epregs;
164
165 struct pci_pool *requests;
166 // statistics...
167 };
168
169 static inline void set_halt (struct net2280_ep *ep)
170 {
171 /* ep0 and bulk/intr endpoints */
172 writel ( (1 << CLEAR_CONTROL_STATUS_PHASE_HANDSHAKE)
173 /* set NAK_OUT for erratum 0114 */
174 | ((ep->dev->chiprev == CHIPREV_1) << SET_NAK_OUT_PACKETS)
175 | (1 << SET_ENDPOINT_HALT)
176 , &ep->regs->ep_rsp);
177 }
178
179 static inline void clear_halt (struct net2280_ep *ep)
180 {
181 /* ep0 and bulk/intr endpoints */
182 writel ( (1 << CLEAR_ENDPOINT_HALT)
183 | (1 << CLEAR_ENDPOINT_TOGGLE)
184 /* unless the gadget driver left a short packet in the
185 * fifo, this reverses the erratum 0114 workaround.
186 */
187 | ((ep->dev->chiprev == CHIPREV_1) << CLEAR_NAK_OUT_PACKETS)
188 , &ep->regs->ep_rsp);
189 }
190
191 #ifdef USE_RDK_LEDS
192
193 static inline void net2280_led_init (struct net2280 *dev)
194 {
195 /* LED3 (green) is on during USB activity. note erratum 0113. */
196 writel ((1 << GPIO3_LED_SELECT)
197 | (1 << GPIO3_OUTPUT_ENABLE)
198 | (1 << GPIO2_OUTPUT_ENABLE)
199 | (1 << GPIO1_OUTPUT_ENABLE)
200 | (1 << GPIO0_OUTPUT_ENABLE)
201 , &dev->regs->gpioctl);
202 }
203
204 /* indicate speed with bi-color LED 0/1 */
205 static inline
206 void net2280_led_speed (struct net2280 *dev, enum usb_device_speed speed)
207 {
208 u32 val = readl (&dev->regs->gpioctl);
209 switch (speed) {
210 case USB_SPEED_HIGH: /* green */
211 val &= ~(1 << GPIO0_DATA);
212 val |= (1 << GPIO1_DATA);
213 break;
214 case USB_SPEED_FULL: /* red */
215 val &= ~(1 << GPIO1_DATA);
216 val |= (1 << GPIO0_DATA);
217 break;
218 default: /* (off/black) */
219 val &= ~((1 << GPIO1_DATA) | (1 << GPIO0_DATA));
220 break;
221 }
222 writel (val, &dev->regs->gpioctl);
223 }
224
225 /* indicate power with LED 2 */
226 static inline void net2280_led_active (struct net2280 *dev, int is_active)
227 {
228 u32 val = readl (&dev->regs->gpioctl);
229
230 // FIXME this LED never seems to turn on.
231 if (is_active)
232 val |= GPIO2_DATA;
233 else
234 val &= ~GPIO2_DATA;
235 writel (val, &dev->regs->gpioctl);
236 }
237 static inline void net2280_led_shutdown (struct net2280 *dev)
238 {
239 /* turn off all four GPIO*_DATA bits */
240 writel (readl (&dev->regs->gpioctl) & ~0x0f,
241 &dev->regs->gpioctl);
242 }
243
244 #else
245
246 #define net2280_led_init(dev) do { } while (0)
247 #define net2280_led_speed(dev, speed) do { } while (0)
248 #define net2280_led_shutdown(dev) do { } while (0)
249
250 #endif
251
252 /*-------------------------------------------------------------------------*/
253
254 #define xprintk(dev,level,fmt,args...) \
255 printk(level "%s %s: " fmt , driver_name , \
256 pci_name(dev->pdev) , ## args)
257
258 #ifdef DEBUG
259 #undef DEBUG
260 #define DEBUG(dev,fmt,args...) \
261 xprintk(dev , KERN_DEBUG , fmt , ## args)
262 #else
263 #define DEBUG(dev,fmt,args...) \
264 do { } while (0)
265 #endif /* DEBUG */
266
267 #ifdef VERBOSE
268 #define VDEBUG DEBUG
269 #else
270 #define VDEBUG(dev,fmt,args...) \
271 do { } while (0)
272 #endif /* VERBOSE */
273
274 #define ERROR(dev,fmt,args...) \
275 xprintk(dev , KERN_ERR , fmt , ## args)
276 #define WARNING(dev,fmt,args...) \
277 xprintk(dev , KERN_WARNING , fmt , ## args)
278 #define INFO(dev,fmt,args...) \
279 xprintk(dev , KERN_INFO , fmt , ## args)
280
281 /*-------------------------------------------------------------------------*/
282
283 static inline void start_out_naking (struct net2280_ep *ep)
284 {
285 /* NOTE: hardware races lurk here, and PING protocol issues */
286 writel ((1 << SET_NAK_OUT_PACKETS), &ep->regs->ep_rsp);
287 /* synch with device */
288 readl (&ep->regs->ep_rsp);
289 }
290
291 #ifdef DEBUG
292 static inline void assert_out_naking (struct net2280_ep *ep, const char *where)
293 {
294 u32 tmp = readl (&ep->regs->ep_stat);
295
296 if ((tmp & (1 << NAK_OUT_PACKETS)) == 0) {
297 DEBUG (ep->dev, "%s %s %08x !NAK\n",
298 ep->ep.name, where, tmp);
299 writel ((1 << SET_NAK_OUT_PACKETS),
300 &ep->regs->ep_rsp);
301 }
302 }
303 #define ASSERT_OUT_NAKING(ep) assert_out_naking(ep,__func__)
304 #else
305 #define ASSERT_OUT_NAKING(ep) do {} while (0)
306 #endif
307
308 static inline void stop_out_naking (struct net2280_ep *ep)
309 {
310 u32 tmp;
311
312 tmp = readl (&ep->regs->ep_stat);
313 if ((tmp & (1 << NAK_OUT_PACKETS)) != 0)
314 writel ((1 << CLEAR_NAK_OUT_PACKETS), &ep->regs->ep_rsp);
315 }
316
317 #endif /* __KERNEL__ */
318
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