xref: /linux/drivers/usb/c67x00/c67x00-ll-hpi.c (revision ca55b2fef3a9373fcfc30f82fd26bc7fccbda732) 
1 /*
2  * c67x00-ll-hpi.c: Cypress C67X00 USB Low level interface using HPI
3  *
4  * Copyright (C) 2006-2008 Barco N.V.
5  *    Derived from the Cypress cy7c67200/300 ezusb linux driver and
6  *    based on multiple host controller drivers inside the linux kernel.
7  *
8  * This program is free software; you can redistribute it and/or modify
9  * it under the terms of the GNU General Public License as published by
10  * the Free Software Foundation; either version 2 of the License, or
11  * (at your option) any later version.
12  *
13  * This program is distributed in the hope that it will be useful,
14  * but WITHOUT ANY WARRANTY; without even the implied warranty of
15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
16  * GNU General Public License for more details.
17  *
18  * You should have received a copy of the GNU General Public License
19  * along with this program; if not, write to the Free Software
20  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
21  * MA  02110-1301  USA.
22  */
23 
24 #include <asm/byteorder.h>
25 #include <linux/delay.h>
26 #include <linux/io.h>
27 #include <linux/jiffies.h>
28 #include <linux/usb/c67x00.h>
29 #include "c67x00.h"
30 
31 #define COMM_REGS 14
32 
33 struct c67x00_lcp_int_data {
34 	u16 regs[COMM_REGS];
35 };
36 
37 /* -------------------------------------------------------------------------- */
38 /* Interface definitions */
39 
40 #define COMM_ACK			0x0FED
41 #define COMM_NAK			0xDEAD
42 
43 #define COMM_RESET			0xFA50
44 #define COMM_EXEC_INT			0xCE01
45 #define COMM_INT_NUM			0x01C2
46 
47 /* Registers 0 to COMM_REGS-1 */
48 #define COMM_R(x)			(0x01C4 + 2 * (x))
49 
50 #define HUSB_SIE_pCurrentTDPtr(x)	((x) ? 0x01B2 : 0x01B0)
51 #define HUSB_SIE_pTDListDone_Sem(x)	((x) ? 0x01B8 : 0x01B6)
52 #define HUSB_pEOT			0x01B4
53 
54 /* Software interrupts */
55 /* 114, 115: */
56 #define HUSB_SIE_INIT_INT(x)		((x) ? 0x0073 : 0x0072)
57 #define HUSB_RESET_INT			0x0074
58 
59 #define SUSB_INIT_INT			0x0071
60 #define SUSB_INIT_INT_LOC		(SUSB_INIT_INT * 2)
61 
62 /* -----------------------------------------------------------------------
63  * HPI implementation
64  *
65  * The c67x00 chip also support control via SPI or HSS serial
66  * interfaces. However, this driver assumes that register access can
67  * be performed from IRQ context. While this is a safe assumption with
68  * the HPI interface, it is not true for the serial interfaces.
69  */
70 
71 /* HPI registers */
72 #define HPI_DATA	0
73 #define HPI_MAILBOX	1
74 #define HPI_ADDR	2
75 #define HPI_STATUS	3
76 
77 /*
78  * According to CY7C67300 specification (tables 140 and 141) HPI read and
79  * write cycle duration Tcyc must be at least 6T long, where T is 1/48MHz,
80  * which is 125ns.
81  */
82 #define HPI_T_CYC_NS	125
83 
84 static inline u16 hpi_read_reg(struct c67x00_device *dev, int reg)
85 {
86 	ndelay(HPI_T_CYC_NS);
87 	return __raw_readw(dev->hpi.base + reg * dev->hpi.regstep);
88 }
89 
90 static inline void hpi_write_reg(struct c67x00_device *dev, int reg, u16 value)
91 {
92 	ndelay(HPI_T_CYC_NS);
93 	__raw_writew(value, dev->hpi.base + reg * dev->hpi.regstep);
94 }
95 
96 static inline u16 hpi_read_word_nolock(struct c67x00_device *dev, u16 reg)
97 {
98 	hpi_write_reg(dev, HPI_ADDR, reg);
99 	return hpi_read_reg(dev, HPI_DATA);
100 }
101 
102 static u16 hpi_read_word(struct c67x00_device *dev, u16 reg)
103 {
104 	u16 value;
105 	unsigned long flags;
106 
107 	spin_lock_irqsave(&dev->hpi.lock, flags);
108 	value = hpi_read_word_nolock(dev, reg);
109 	spin_unlock_irqrestore(&dev->hpi.lock, flags);
110 
111 	return value;
112 }
113 
114 static void hpi_write_word_nolock(struct c67x00_device *dev, u16 reg, u16 value)
115 {
116 	hpi_write_reg(dev, HPI_ADDR, reg);
117 	hpi_write_reg(dev, HPI_DATA, value);
118 }
119 
120 static void hpi_write_word(struct c67x00_device *dev, u16 reg, u16 value)
121 {
122 	unsigned long flags;
123 
124 	spin_lock_irqsave(&dev->hpi.lock, flags);
125 	hpi_write_word_nolock(dev, reg, value);
126 	spin_unlock_irqrestore(&dev->hpi.lock, flags);
127 }
128 
129 /*
130  * Only data is little endian, addr has cpu endianess
131  */
132 static void hpi_write_words_le16(struct c67x00_device *dev, u16 addr,
133 				 __le16 *data, u16 count)
134 {
135 	unsigned long flags;
136 	int i;
137 
138 	spin_lock_irqsave(&dev->hpi.lock, flags);
139 
140 	hpi_write_reg(dev, HPI_ADDR, addr);
141 	for (i = 0; i < count; i++)
142 		hpi_write_reg(dev, HPI_DATA, le16_to_cpu(*data++));
143 
144 	spin_unlock_irqrestore(&dev->hpi.lock, flags);
145 }
146 
147 /*
148  * Only data is little endian, addr has cpu endianess
149  */
150 static void hpi_read_words_le16(struct c67x00_device *dev, u16 addr,
151 				__le16 *data, u16 count)
152 {
153 	unsigned long flags;
154 	int i;
155 
156 	spin_lock_irqsave(&dev->hpi.lock, flags);
157 	hpi_write_reg(dev, HPI_ADDR, addr);
158 	for (i = 0; i < count; i++)
159 		*data++ = cpu_to_le16(hpi_read_reg(dev, HPI_DATA));
160 
161 	spin_unlock_irqrestore(&dev->hpi.lock, flags);
162 }
163 
164 static void hpi_set_bits(struct c67x00_device *dev, u16 reg, u16 mask)
165 {
166 	u16 value;
167 	unsigned long flags;
168 
169 	spin_lock_irqsave(&dev->hpi.lock, flags);
170 	value = hpi_read_word_nolock(dev, reg);
171 	hpi_write_word_nolock(dev, reg, value | mask);
172 	spin_unlock_irqrestore(&dev->hpi.lock, flags);
173 }
174 
175 static void hpi_clear_bits(struct c67x00_device *dev, u16 reg, u16 mask)
176 {
177 	u16 value;
178 	unsigned long flags;
179 
180 	spin_lock_irqsave(&dev->hpi.lock, flags);
181 	value = hpi_read_word_nolock(dev, reg);
182 	hpi_write_word_nolock(dev, reg, value & ~mask);
183 	spin_unlock_irqrestore(&dev->hpi.lock, flags);
184 }
185 
186 static u16 hpi_recv_mbox(struct c67x00_device *dev)
187 {
188 	u16 value;
189 	unsigned long flags;
190 
191 	spin_lock_irqsave(&dev->hpi.lock, flags);
192 	value = hpi_read_reg(dev, HPI_MAILBOX);
193 	spin_unlock_irqrestore(&dev->hpi.lock, flags);
194 
195 	return value;
196 }
197 
198 static u16 hpi_send_mbox(struct c67x00_device *dev, u16 value)
199 {
200 	unsigned long flags;
201 
202 	spin_lock_irqsave(&dev->hpi.lock, flags);
203 	hpi_write_reg(dev, HPI_MAILBOX, value);
204 	spin_unlock_irqrestore(&dev->hpi.lock, flags);
205 
206 	return value;
207 }
208 
209 u16 c67x00_ll_hpi_status(struct c67x00_device *dev)
210 {
211 	u16 value;
212 	unsigned long flags;
213 
214 	spin_lock_irqsave(&dev->hpi.lock, flags);
215 	value = hpi_read_reg(dev, HPI_STATUS);
216 	spin_unlock_irqrestore(&dev->hpi.lock, flags);
217 
218 	return value;
219 }
220 
221 void c67x00_ll_hpi_reg_init(struct c67x00_device *dev)
222 {
223 	int i;
224 
225 	hpi_recv_mbox(dev);
226 	c67x00_ll_hpi_status(dev);
227 	hpi_write_word(dev, HPI_IRQ_ROUTING_REG, 0);
228 
229 	for (i = 0; i < C67X00_SIES; i++) {
230 		hpi_write_word(dev, SIEMSG_REG(i), 0);
231 		hpi_read_word(dev, SIEMSG_REG(i));
232 	}
233 }
234 
235 void c67x00_ll_hpi_enable_sofeop(struct c67x00_sie *sie)
236 {
237 	hpi_set_bits(sie->dev, HPI_IRQ_ROUTING_REG,
238 		     SOFEOP_TO_HPI_EN(sie->sie_num));
239 }
240 
241 void c67x00_ll_hpi_disable_sofeop(struct c67x00_sie *sie)
242 {
243 	hpi_clear_bits(sie->dev, HPI_IRQ_ROUTING_REG,
244 		       SOFEOP_TO_HPI_EN(sie->sie_num));
245 }
246 
247 /* -------------------------------------------------------------------------- */
248 /* Transactions */
249 
250 static inline int ll_recv_msg(struct c67x00_device *dev)
251 {
252 	u16 res;
253 
254 	res = wait_for_completion_timeout(&dev->hpi.lcp.msg_received, 5 * HZ);
255 	WARN_ON(!res);
256 
257 	return (res == 0) ? -EIO : 0;
258 }
259 
260 /* -------------------------------------------------------------------------- */
261 /* General functions */
262 
263 u16 c67x00_ll_fetch_siemsg(struct c67x00_device *dev, int sie_num)
264 {
265 	u16 val;
266 
267 	val = hpi_read_word(dev, SIEMSG_REG(sie_num));
268 	/* clear register to allow next message */
269 	hpi_write_word(dev, SIEMSG_REG(sie_num), 0);
270 
271 	return val;
272 }
273 
274 u16 c67x00_ll_get_usb_ctl(struct c67x00_sie *sie)
275 {
276 	return hpi_read_word(sie->dev, USB_CTL_REG(sie->sie_num));
277 }
278 
279 /**
280  * c67x00_ll_usb_clear_status - clear the USB status bits
281  */
282 void c67x00_ll_usb_clear_status(struct c67x00_sie *sie, u16 bits)
283 {
284 	hpi_write_word(sie->dev, USB_STAT_REG(sie->sie_num), bits);
285 }
286 
287 u16 c67x00_ll_usb_get_status(struct c67x00_sie *sie)
288 {
289 	return hpi_read_word(sie->dev, USB_STAT_REG(sie->sie_num));
290 }
291 
292 /* -------------------------------------------------------------------------- */
293 
294 static int c67x00_comm_exec_int(struct c67x00_device *dev, u16 nr,
295 				struct c67x00_lcp_int_data *data)
296 {
297 	int i, rc;
298 
299 	mutex_lock(&dev->hpi.lcp.mutex);
300 	hpi_write_word(dev, COMM_INT_NUM, nr);
301 	for (i = 0; i < COMM_REGS; i++)
302 		hpi_write_word(dev, COMM_R(i), data->regs[i]);
303 	hpi_send_mbox(dev, COMM_EXEC_INT);
304 	rc = ll_recv_msg(dev);
305 	mutex_unlock(&dev->hpi.lcp.mutex);
306 
307 	return rc;
308 }
309 
310 /* -------------------------------------------------------------------------- */
311 /* Host specific functions */
312 
313 void c67x00_ll_set_husb_eot(struct c67x00_device *dev, u16 value)
314 {
315 	mutex_lock(&dev->hpi.lcp.mutex);
316 	hpi_write_word(dev, HUSB_pEOT, value);
317 	mutex_unlock(&dev->hpi.lcp.mutex);
318 }
319 
320 static inline void c67x00_ll_husb_sie_init(struct c67x00_sie *sie)
321 {
322 	struct c67x00_device *dev = sie->dev;
323 	struct c67x00_lcp_int_data data;
324 	int rc;
325 
326 	rc = c67x00_comm_exec_int(dev, HUSB_SIE_INIT_INT(sie->sie_num), &data);
327 	BUG_ON(rc); /* No return path for error code; crash spectacularly */
328 }
329 
330 void c67x00_ll_husb_reset(struct c67x00_sie *sie, int port)
331 {
332 	struct c67x00_device *dev = sie->dev;
333 	struct c67x00_lcp_int_data data;
334 	int rc;
335 
336 	data.regs[0] = 50;	/* Reset USB port for 50ms */
337 	data.regs[1] = port | (sie->sie_num << 1);
338 	rc = c67x00_comm_exec_int(dev, HUSB_RESET_INT, &data);
339 	BUG_ON(rc); /* No return path for error code; crash spectacularly */
340 }
341 
342 void c67x00_ll_husb_set_current_td(struct c67x00_sie *sie, u16 addr)
343 {
344 	hpi_write_word(sie->dev, HUSB_SIE_pCurrentTDPtr(sie->sie_num), addr);
345 }
346 
347 u16 c67x00_ll_husb_get_current_td(struct c67x00_sie *sie)
348 {
349 	return hpi_read_word(sie->dev, HUSB_SIE_pCurrentTDPtr(sie->sie_num));
350 }
351 
352 u16 c67x00_ll_husb_get_frame(struct c67x00_sie *sie)
353 {
354 	return hpi_read_word(sie->dev, HOST_FRAME_REG(sie->sie_num));
355 }
356 
357 void c67x00_ll_husb_init_host_port(struct c67x00_sie *sie)
358 {
359 	/* Set port into host mode */
360 	hpi_set_bits(sie->dev, USB_CTL_REG(sie->sie_num), HOST_MODE);
361 	c67x00_ll_husb_sie_init(sie);
362 	/* Clear interrupts */
363 	c67x00_ll_usb_clear_status(sie, HOST_STAT_MASK);
364 	/* Check */
365 	if (!(hpi_read_word(sie->dev, USB_CTL_REG(sie->sie_num)) & HOST_MODE))
366 		dev_warn(sie_dev(sie),
367 			 "SIE %d not set to host mode\n", sie->sie_num);
368 }
369 
370 void c67x00_ll_husb_reset_port(struct c67x00_sie *sie, int port)
371 {
372 	/* Clear connect change */
373 	c67x00_ll_usb_clear_status(sie, PORT_CONNECT_CHANGE(port));
374 
375 	/* Enable interrupts */
376 	hpi_set_bits(sie->dev, HPI_IRQ_ROUTING_REG,
377 		     SOFEOP_TO_CPU_EN(sie->sie_num));
378 	hpi_set_bits(sie->dev, HOST_IRQ_EN_REG(sie->sie_num),
379 		     SOF_EOP_IRQ_EN | DONE_IRQ_EN);
380 
381 	/* Enable pull down transistors */
382 	hpi_set_bits(sie->dev, USB_CTL_REG(sie->sie_num), PORT_RES_EN(port));
383 }
384 
385 /* -------------------------------------------------------------------------- */
386 
387 void c67x00_ll_irq(struct c67x00_device *dev, u16 int_status)
388 {
389 	if ((int_status & MBX_OUT_FLG) == 0)
390 		return;
391 
392 	dev->hpi.lcp.last_msg = hpi_recv_mbox(dev);
393 	complete(&dev->hpi.lcp.msg_received);
394 }
395 
396 /* -------------------------------------------------------------------------- */
397 
398 int c67x00_ll_reset(struct c67x00_device *dev)
399 {
400 	int rc;
401 
402 	mutex_lock(&dev->hpi.lcp.mutex);
403 	hpi_send_mbox(dev, COMM_RESET);
404 	rc = ll_recv_msg(dev);
405 	mutex_unlock(&dev->hpi.lcp.mutex);
406 
407 	return rc;
408 }
409 
410 /* -------------------------------------------------------------------------- */
411 
412 /**
413  * c67x00_ll_write_mem_le16 - write into c67x00 memory
414  * Only data is little endian, addr has cpu endianess.
415  */
416 void c67x00_ll_write_mem_le16(struct c67x00_device *dev, u16 addr,
417 			      void *data, int len)
418 {
419 	u8 *buf = data;
420 
421 	/* Sanity check */
422 	if (addr + len > 0xffff) {
423 		dev_err(&dev->pdev->dev,
424 			"Trying to write beyond writable region!\n");
425 		return;
426 	}
427 
428 	if (addr & 0x01) {
429 		/* unaligned access */
430 		u16 tmp;
431 		tmp = hpi_read_word(dev, addr - 1);
432 		tmp = (tmp & 0x00ff) | (*buf++ << 8);
433 		hpi_write_word(dev, addr - 1, tmp);
434 		addr++;
435 		len--;
436 	}
437 
438 	hpi_write_words_le16(dev, addr, (__le16 *)buf, len / 2);
439 	buf += len & ~0x01;
440 	addr += len & ~0x01;
441 	len &= 0x01;
442 
443 	if (len) {
444 		u16 tmp;
445 		tmp = hpi_read_word(dev, addr);
446 		tmp = (tmp & 0xff00) | *buf;
447 		hpi_write_word(dev, addr, tmp);
448 	}
449 }
450 
451 /**
452  * c67x00_ll_read_mem_le16 - read from c67x00 memory
453  * Only data is little endian, addr has cpu endianess.
454  */
455 void c67x00_ll_read_mem_le16(struct c67x00_device *dev, u16 addr,
456 			     void *data, int len)
457 {
458 	u8 *buf = data;
459 
460 	if (addr & 0x01) {
461 		/* unaligned access */
462 		u16 tmp;
463 		tmp = hpi_read_word(dev, addr - 1);
464 		*buf++ = (tmp >> 8) & 0x00ff;
465 		addr++;
466 		len--;
467 	}
468 
469 	hpi_read_words_le16(dev, addr, (__le16 *)buf, len / 2);
470 	buf += len & ~0x01;
471 	addr += len & ~0x01;
472 	len &= 0x01;
473 
474 	if (len) {
475 		u16 tmp;
476 		tmp = hpi_read_word(dev, addr);
477 		*buf = tmp & 0x00ff;
478 	}
479 }
480 
481 /* -------------------------------------------------------------------------- */
482 
483 void c67x00_ll_init(struct c67x00_device *dev)
484 {
485 	mutex_init(&dev->hpi.lcp.mutex);
486 	init_completion(&dev->hpi.lcp.msg_received);
487 }
488 
489 void c67x00_ll_release(struct c67x00_device *dev)
490 {
491 }
492