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treewide: remove redundant IS_ERR() before error code check
[linux/fpc-iii.git] / arch / mips / alchemy / common / usb.c
blob5d618547ebf0155643f7dc5c419a64f8ce88884b
1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3 * USB block power/access management abstraction.
4 *
5 * Au1000+: The OHCI block control register is at the far end of the OHCI memory
6 * area. Au1550 has OHCI on different base address. No need to handle
7 * UDC here.
8 * Au1200: one register to control access and clocks to O/EHCI, UDC and OTG
9 * as well as the PHY for EHCI and UDC.
10 *
11 */
12
13 #include <linux/clk.h>
14 #include <linux/export.h>
15 #include <linux/init.h>
16 #include <linux/io.h>
17 #include <linux/spinlock.h>
18 #include <linux/syscore_ops.h>
19 #include <asm/cpu.h>
20 #include <asm/mach-au1x00/au1000.h>
21
22 /* control register offsets */
23 #define AU1000_OHCICFG 0x7fffc
24 #define AU1550_OHCICFG 0x07ffc
25 #define AU1200_USBCFG 0x04
26
27 /* Au1000 USB block config bits */
28 #define USBHEN_RD (1 << 4) /* OHCI reset-done indicator */
29 #define USBHEN_CE (1 << 3) /* OHCI block clock enable */
30 #define USBHEN_E (1 << 2) /* OHCI block enable */
31 #define USBHEN_C (1 << 1) /* OHCI block coherency bit */
32 #define USBHEN_BE (1 << 0) /* OHCI Big-Endian */
33
34 /* Au1200 USB config bits */
35 #define USBCFG_PFEN (1 << 31) /* prefetch enable (undoc) */
36 #define USBCFG_RDCOMB (1 << 30) /* read combining (undoc) */
37 #define USBCFG_UNKNOWN (5 << 20) /* unknown, leave this way */
38 #define USBCFG_SSD (1 << 23) /* serial short detect en */
39 #define USBCFG_PPE (1 << 19) /* HS PHY PLL */
40 #define USBCFG_UCE (1 << 18) /* UDC clock enable */
41 #define USBCFG_ECE (1 << 17) /* EHCI clock enable */
42 #define USBCFG_OCE (1 << 16) /* OHCI clock enable */
43 #define USBCFG_FLA(x) (((x) & 0x3f) << 8)
44 #define USBCFG_UCAM (1 << 7) /* coherent access (undoc) */
45 #define USBCFG_GME (1 << 6) /* OTG mem access */
46 #define USBCFG_DBE (1 << 5) /* UDC busmaster enable */
47 #define USBCFG_DME (1 << 4) /* UDC mem enable */
48 #define USBCFG_EBE (1 << 3) /* EHCI busmaster enable */
49 #define USBCFG_EME (1 << 2) /* EHCI mem enable */
50 #define USBCFG_OBE (1 << 1) /* OHCI busmaster enable */
51 #define USBCFG_OME (1 << 0) /* OHCI mem enable */
52 #define USBCFG_INIT_AU1200 (USBCFG_PFEN | USBCFG_RDCOMB | USBCFG_UNKNOWN |\
53 USBCFG_SSD | USBCFG_FLA(0x20) | USBCFG_UCAM | \
54 USBCFG_GME | USBCFG_DBE | USBCFG_DME | \
55 USBCFG_EBE | USBCFG_EME | USBCFG_OBE | \
56 USBCFG_OME)
57
58 /* Au1300 USB config registers */
59 #define USB_DWC_CTRL1 0x00
60 #define USB_DWC_CTRL2 0x04
61 #define USB_VBUS_TIMER 0x10
62 #define USB_SBUS_CTRL 0x14
63 #define USB_MSR_ERR 0x18
64 #define USB_DWC_CTRL3 0x1C
65 #define USB_DWC_CTRL4 0x20
66 #define USB_OTG_STATUS 0x28
67 #define USB_DWC_CTRL5 0x2C
68 #define USB_DWC_CTRL6 0x30
69 #define USB_DWC_CTRL7 0x34
70 #define USB_PHY_STATUS 0xC0
71 #define USB_INT_STATUS 0xC4
72 #define USB_INT_ENABLE 0xC8
73
74 #define USB_DWC_CTRL1_OTGD 0x04 /* set to DISable OTG */
75 #define USB_DWC_CTRL1_HSTRS 0x02 /* set to ENable EHCI */
76 #define USB_DWC_CTRL1_DCRS 0x01 /* set to ENable UDC */
77
78 #define USB_DWC_CTRL2_PHY1RS 0x04 /* set to enable PHY1 */
79 #define USB_DWC_CTRL2_PHY0RS 0x02 /* set to enable PHY0 */
80 #define USB_DWC_CTRL2_PHYRS 0x01 /* set to enable PHY */
81
82 #define USB_DWC_CTRL3_OHCI1_CKEN (1 << 19)
83 #define USB_DWC_CTRL3_OHCI0_CKEN (1 << 18)
84 #define USB_DWC_CTRL3_EHCI0_CKEN (1 << 17)
85 #define USB_DWC_CTRL3_OTG0_CKEN (1 << 16)
86
87 #define USB_SBUS_CTRL_SBCA 0x04 /* coherent access */
88
89 #define USB_INTEN_FORCE 0x20
90 #define USB_INTEN_PHY 0x10
91 #define USB_INTEN_UDC 0x08
92 #define USB_INTEN_EHCI 0x04
93 #define USB_INTEN_OHCI1 0x02
94 #define USB_INTEN_OHCI0 0x01
95
96 static DEFINE_SPINLOCK(alchemy_usb_lock);
97
98 static inline void __au1300_usb_phyctl(void __iomem *base, int enable)
99 {
100 unsigned long r, s;
101
102 r = __raw_readl(base + USB_DWC_CTRL2);
103 s = __raw_readl(base + USB_DWC_CTRL3);
104
105 s &= USB_DWC_CTRL3_OHCI1_CKEN | USB_DWC_CTRL3_OHCI0_CKEN |
106 USB_DWC_CTRL3_EHCI0_CKEN | USB_DWC_CTRL3_OTG0_CKEN;
107
108 if (enable) {
109 /* simply enable all PHYs */
110 r |= USB_DWC_CTRL2_PHY1RS | USB_DWC_CTRL2_PHY0RS |
111 USB_DWC_CTRL2_PHYRS;
112 __raw_writel(r, base + USB_DWC_CTRL2);
113 wmb();
114 } else if (!s) {
115 /* no USB block active, do disable all PHYs */
116 r &= ~(USB_DWC_CTRL2_PHY1RS | USB_DWC_CTRL2_PHY0RS |
117 USB_DWC_CTRL2_PHYRS);
118 __raw_writel(r, base + USB_DWC_CTRL2);
119 wmb();
120 }
121 }
122
123 static inline void __au1300_ohci_control(void __iomem *base, int enable, int id)
124 {
125 unsigned long r;
126
127 if (enable) {
128 __raw_writel(1, base + USB_DWC_CTRL7); /* start OHCI clock */
129 wmb();
130
131 r = __raw_readl(base + USB_DWC_CTRL3); /* enable OHCI block */
132 r |= (id == 0) ? USB_DWC_CTRL3_OHCI0_CKEN
133 : USB_DWC_CTRL3_OHCI1_CKEN;
134 __raw_writel(r, base + USB_DWC_CTRL3);
135 wmb();
136
137 __au1300_usb_phyctl(base, enable); /* power up the PHYs */
138
139 r = __raw_readl(base + USB_INT_ENABLE);
140 r |= (id == 0) ? USB_INTEN_OHCI0 : USB_INTEN_OHCI1;
141 __raw_writel(r, base + USB_INT_ENABLE);
142 wmb();
143
144 /* reset the OHCI start clock bit */
145 __raw_writel(0, base + USB_DWC_CTRL7);
146 wmb();
147 } else {
148 r = __raw_readl(base + USB_INT_ENABLE);
149 r &= ~((id == 0) ? USB_INTEN_OHCI0 : USB_INTEN_OHCI1);
150 __raw_writel(r, base + USB_INT_ENABLE);
151 wmb();
152
153 r = __raw_readl(base + USB_DWC_CTRL3);
154 r &= ~((id == 0) ? USB_DWC_CTRL3_OHCI0_CKEN
155 : USB_DWC_CTRL3_OHCI1_CKEN);
156 __raw_writel(r, base + USB_DWC_CTRL3);
157 wmb();
158
159 __au1300_usb_phyctl(base, enable);
160 }
161 }
162
163 static inline void __au1300_ehci_control(void __iomem *base, int enable)
164 {
165 unsigned long r;
166
167 if (enable) {
168 r = __raw_readl(base + USB_DWC_CTRL3);
169 r |= USB_DWC_CTRL3_EHCI0_CKEN;
170 __raw_writel(r, base + USB_DWC_CTRL3);
171 wmb();
172
173 r = __raw_readl(base + USB_DWC_CTRL1);
174 r |= USB_DWC_CTRL1_HSTRS;
175 __raw_writel(r, base + USB_DWC_CTRL1);
176 wmb();
177
178 __au1300_usb_phyctl(base, enable);
179
180 r = __raw_readl(base + USB_INT_ENABLE);
181 r |= USB_INTEN_EHCI;
182 __raw_writel(r, base + USB_INT_ENABLE);
183 wmb();
184 } else {
185 r = __raw_readl(base + USB_INT_ENABLE);
186 r &= ~USB_INTEN_EHCI;
187 __raw_writel(r, base + USB_INT_ENABLE);
188 wmb();
189
190 r = __raw_readl(base + USB_DWC_CTRL1);
191 r &= ~USB_DWC_CTRL1_HSTRS;
192 __raw_writel(r, base + USB_DWC_CTRL1);
193 wmb();
194
195 r = __raw_readl(base + USB_DWC_CTRL3);
196 r &= ~USB_DWC_CTRL3_EHCI0_CKEN;
197 __raw_writel(r, base + USB_DWC_CTRL3);
198 wmb();
199
200 __au1300_usb_phyctl(base, enable);
201 }
202 }
203
204 static inline void __au1300_udc_control(void __iomem *base, int enable)
205 {
206 unsigned long r;
207
208 if (enable) {
209 r = __raw_readl(base + USB_DWC_CTRL1);
210 r |= USB_DWC_CTRL1_DCRS;
211 __raw_writel(r, base + USB_DWC_CTRL1);
212 wmb();
213
214 __au1300_usb_phyctl(base, enable);
215
216 r = __raw_readl(base + USB_INT_ENABLE);
217 r |= USB_INTEN_UDC;
218 __raw_writel(r, base + USB_INT_ENABLE);
219 wmb();
220 } else {
221 r = __raw_readl(base + USB_INT_ENABLE);
222 r &= ~USB_INTEN_UDC;
223 __raw_writel(r, base + USB_INT_ENABLE);
224 wmb();
225
226 r = __raw_readl(base + USB_DWC_CTRL1);
227 r &= ~USB_DWC_CTRL1_DCRS;
228 __raw_writel(r, base + USB_DWC_CTRL1);
229 wmb();
230
231 __au1300_usb_phyctl(base, enable);
232 }
233 }
234
235 static inline void __au1300_otg_control(void __iomem *base, int enable)
236 {
237 unsigned long r;
238 if (enable) {
239 r = __raw_readl(base + USB_DWC_CTRL3);
240 r |= USB_DWC_CTRL3_OTG0_CKEN;
241 __raw_writel(r, base + USB_DWC_CTRL3);
242 wmb();
243
244 r = __raw_readl(base + USB_DWC_CTRL1);
245 r &= ~USB_DWC_CTRL1_OTGD;
246 __raw_writel(r, base + USB_DWC_CTRL1);
247 wmb();
248
249 __au1300_usb_phyctl(base, enable);
250 } else {
251 r = __raw_readl(base + USB_DWC_CTRL1);
252 r |= USB_DWC_CTRL1_OTGD;
253 __raw_writel(r, base + USB_DWC_CTRL1);
254 wmb();
255
256 r = __raw_readl(base + USB_DWC_CTRL3);
257 r &= ~USB_DWC_CTRL3_OTG0_CKEN;
258 __raw_writel(r, base + USB_DWC_CTRL3);
259 wmb();
260
261 __au1300_usb_phyctl(base, enable);
262 }
263 }
264
265 static inline int au1300_usb_control(int block, int enable)
266 {
267 void __iomem *base =
268 (void __iomem *)KSEG1ADDR(AU1300_USB_CTL_PHYS_ADDR);
269 int ret = 0;
270
271 switch (block) {
272 case ALCHEMY_USB_OHCI0:
273 __au1300_ohci_control(base, enable, 0);
274 break;
275 case ALCHEMY_USB_OHCI1:
276 __au1300_ohci_control(base, enable, 1);
277 break;
278 case ALCHEMY_USB_EHCI0:
279 __au1300_ehci_control(base, enable);
280 break;
281 case ALCHEMY_USB_UDC0:
282 __au1300_udc_control(base, enable);
283 break;
284 case ALCHEMY_USB_OTG0:
285 __au1300_otg_control(base, enable);
286 break;
287 default:
288 ret = -ENODEV;
289 }
290 return ret;
291 }
292
293 static inline void au1300_usb_init(void)
294 {
295 void __iomem *base =
296 (void __iomem *)KSEG1ADDR(AU1300_USB_CTL_PHYS_ADDR);
297
298 /* set some sane defaults. Note: we don't fiddle with DWC_CTRL4
299 * here at all: Port 2 routing (EHCI or UDC) must be set either
300 * by boot firmware or platform init code; I can't autodetect
301 * a sane setting.
302 */
303 __raw_writel(0, base + USB_INT_ENABLE); /* disable all USB irqs */
304 wmb();
305 __raw_writel(0, base + USB_DWC_CTRL3); /* disable all clocks */
306 wmb();
307 __raw_writel(~0, base + USB_MSR_ERR); /* clear all errors */
308 wmb();
309 __raw_writel(~0, base + USB_INT_STATUS); /* clear int status */
310 wmb();
311 /* set coherent access bit */
312 __raw_writel(USB_SBUS_CTRL_SBCA, base + USB_SBUS_CTRL);
313 wmb();
314 }
315
316 static inline void __au1200_ohci_control(void __iomem *base, int enable)
317 {
318 unsigned long r = __raw_readl(base + AU1200_USBCFG);
319 if (enable) {
320 __raw_writel(r | USBCFG_OCE, base + AU1200_USBCFG);
321 wmb();
322 udelay(2000);
323 } else {
324 __raw_writel(r & ~USBCFG_OCE, base + AU1200_USBCFG);
325 wmb();
326 udelay(1000);
327 }
328 }
329
330 static inline void __au1200_ehci_control(void __iomem *base, int enable)
331 {
332 unsigned long r = __raw_readl(base + AU1200_USBCFG);
333 if (enable) {
334 __raw_writel(r | USBCFG_ECE | USBCFG_PPE, base + AU1200_USBCFG);
335 wmb();
336 udelay(1000);
337 } else {
338 if (!(r & USBCFG_UCE)) /* UDC also off? */
339 r &= ~USBCFG_PPE; /* yes: disable HS PHY PLL */
340 __raw_writel(r & ~USBCFG_ECE, base + AU1200_USBCFG);
341 wmb();
342 udelay(1000);
343 }
344 }
345
346 static inline void __au1200_udc_control(void __iomem *base, int enable)
347 {
348 unsigned long r = __raw_readl(base + AU1200_USBCFG);
349 if (enable) {
350 __raw_writel(r | USBCFG_UCE | USBCFG_PPE, base + AU1200_USBCFG);
351 wmb();
352 } else {
353 if (!(r & USBCFG_ECE)) /* EHCI also off? */
354 r &= ~USBCFG_PPE; /* yes: disable HS PHY PLL */
355 __raw_writel(r & ~USBCFG_UCE, base + AU1200_USBCFG);
356 wmb();
357 }
358 }
359
360 static inline int au1200_usb_control(int block, int enable)
361 {
362 void __iomem *base =
363 (void __iomem *)KSEG1ADDR(AU1200_USB_CTL_PHYS_ADDR);
364
365 switch (block) {
366 case ALCHEMY_USB_OHCI0:
367 __au1200_ohci_control(base, enable);
368 break;
369 case ALCHEMY_USB_UDC0:
370 __au1200_udc_control(base, enable);
371 break;
372 case ALCHEMY_USB_EHCI0:
373 __au1200_ehci_control(base, enable);
374 break;
375 default:
376 return -ENODEV;
377 }
378 return 0;
379 }
380
381
382 /* initialize USB block(s) to a known working state */
383 static inline void au1200_usb_init(void)
384 {
385 void __iomem *base =
386 (void __iomem *)KSEG1ADDR(AU1200_USB_CTL_PHYS_ADDR);
387 __raw_writel(USBCFG_INIT_AU1200, base + AU1200_USBCFG);
388 wmb();
389 udelay(1000);
390 }
391
392 static inline int au1000_usb_init(unsigned long rb, int reg)
393 {
394 void __iomem *base = (void __iomem *)KSEG1ADDR(rb + reg);
395 unsigned long r = __raw_readl(base);
396 struct clk *c;
397
398 /* 48MHz check. Don't init if no one can provide it */
399 c = clk_get(NULL, "usbh_clk");
400 if (IS_ERR(c))
401 return -ENODEV;
402 if (clk_round_rate(c, 48000000) != 48000000) {
403 clk_put(c);
404 return -ENODEV;
405 }
406 if (clk_set_rate(c, 48000000)) {
407 clk_put(c);
408 return -ENODEV;
409 }
410 clk_put(c);
411
412 #if defined(__BIG_ENDIAN)
413 r |= USBHEN_BE;
414 #endif
415 r |= USBHEN_C;
416
417 __raw_writel(r, base);
418 wmb();
419 udelay(1000);
420
421 return 0;
422 }
423
424
425 static inline void __au1xx0_ohci_control(int enable, unsigned long rb, int creg)
426 {
427 void __iomem *base = (void __iomem *)KSEG1ADDR(rb);
428 unsigned long r = __raw_readl(base + creg);
429 struct clk *c = clk_get(NULL, "usbh_clk");
430
431 if (IS_ERR(c))
432 return;
433
434 if (enable) {
435 if (clk_prepare_enable(c))
436 goto out;
437
438 __raw_writel(r | USBHEN_CE, base + creg);
439 wmb();
440 udelay(1000);
441 __raw_writel(r | USBHEN_CE | USBHEN_E, base + creg);
442 wmb();
443 udelay(1000);
444
445 /* wait for reset complete (read reg twice: au1500 erratum) */
446 while (__raw_readl(base + creg),
447 !(__raw_readl(base + creg) & USBHEN_RD))
448 udelay(1000);
449 } else {
450 __raw_writel(r & ~(USBHEN_CE | USBHEN_E), base + creg);
451 wmb();
452 clk_disable_unprepare(c);
453 }
454 out:
455 clk_put(c);
456 }
457
458 static inline int au1000_usb_control(int block, int enable, unsigned long rb,
459 int creg)
460 {
461 int ret = 0;
462
463 switch (block) {
464 case ALCHEMY_USB_OHCI0:
465 __au1xx0_ohci_control(enable, rb, creg);
466 break;
467 default:
468 ret = -ENODEV;
469 }
470 return ret;
471 }
472
473 /*
474 * alchemy_usb_control - control Alchemy on-chip USB blocks
475 * @block: USB block to target
476 * @enable: set 1 to enable a block, 0 to disable
477 */
478 int alchemy_usb_control(int block, int enable)
479 {
480 unsigned long flags;
481 int ret;
482
483 spin_lock_irqsave(&alchemy_usb_lock, flags);
484 switch (alchemy_get_cputype()) {
485 case ALCHEMY_CPU_AU1000:
486 case ALCHEMY_CPU_AU1500:
487 case ALCHEMY_CPU_AU1100:
488 ret = au1000_usb_control(block, enable,
489 AU1000_USB_OHCI_PHYS_ADDR, AU1000_OHCICFG);
490 break;
491 case ALCHEMY_CPU_AU1550:
492 ret = au1000_usb_control(block, enable,
493 AU1550_USB_OHCI_PHYS_ADDR, AU1550_OHCICFG);
494 break;
495 case ALCHEMY_CPU_AU1200:
496 ret = au1200_usb_control(block, enable);
497 break;
498 case ALCHEMY_CPU_AU1300:
499 ret = au1300_usb_control(block, enable);
500 break;
501 default:
502 ret = -ENODEV;
503 }
504 spin_unlock_irqrestore(&alchemy_usb_lock, flags);
505 return ret;
506 }
507 EXPORT_SYMBOL_GPL(alchemy_usb_control);
508
509
510 static unsigned long alchemy_usb_pmdata[2];
511
512 static void au1000_usb_pm(unsigned long br, int creg, int susp)
513 {
514 void __iomem *base = (void __iomem *)KSEG1ADDR(br);
515
516 if (susp) {
517 alchemy_usb_pmdata[0] = __raw_readl(base + creg);
518 /* There appears to be some undocumented reset register.... */
519 __raw_writel(0, base + 0x04);
520 wmb();
521 __raw_writel(0, base + creg);
522 wmb();
523 } else {
524 __raw_writel(alchemy_usb_pmdata[0], base + creg);
525 wmb();
526 }
527 }
528
529 static void au1200_usb_pm(int susp)
530 {
531 void __iomem *base =
532 (void __iomem *)KSEG1ADDR(AU1200_USB_OTG_PHYS_ADDR);
533 if (susp) {
534 /* save OTG_CAP/MUX registers which indicate port routing */
535 /* FIXME: write an OTG driver to do that */
536 alchemy_usb_pmdata[0] = __raw_readl(base + 0x00);
537 alchemy_usb_pmdata[1] = __raw_readl(base + 0x04);
538 } else {
539 /* restore access to all MMIO areas */
540 au1200_usb_init();
541
542 /* restore OTG_CAP/MUX registers */
543 __raw_writel(alchemy_usb_pmdata[0], base + 0x00);
544 __raw_writel(alchemy_usb_pmdata[1], base + 0x04);
545 wmb();
546 }
547 }
548
549 static void au1300_usb_pm(int susp)
550 {
551 void __iomem *base =
552 (void __iomem *)KSEG1ADDR(AU1300_USB_CTL_PHYS_ADDR);
553 /* remember Port2 routing */
554 if (susp) {
555 alchemy_usb_pmdata[0] = __raw_readl(base + USB_DWC_CTRL4);
556 } else {
557 au1300_usb_init();
558 __raw_writel(alchemy_usb_pmdata[0], base + USB_DWC_CTRL4);
559 wmb();
560 }
561 }
562
563 static void alchemy_usb_pm(int susp)
564 {
565 switch (alchemy_get_cputype()) {
566 case ALCHEMY_CPU_AU1000:
567 case ALCHEMY_CPU_AU1500:
568 case ALCHEMY_CPU_AU1100:
569 au1000_usb_pm(AU1000_USB_OHCI_PHYS_ADDR, AU1000_OHCICFG, susp);
570 break;
571 case ALCHEMY_CPU_AU1550:
572 au1000_usb_pm(AU1550_USB_OHCI_PHYS_ADDR, AU1550_OHCICFG, susp);
573 break;
574 case ALCHEMY_CPU_AU1200:
575 au1200_usb_pm(susp);
576 break;
577 case ALCHEMY_CPU_AU1300:
578 au1300_usb_pm(susp);
579 break;
580 }
581 }
582
583 static int alchemy_usb_suspend(void)
584 {
585 alchemy_usb_pm(1);
586 return 0;
587 }
588
589 static void alchemy_usb_resume(void)
590 {
591 alchemy_usb_pm(0);
592 }
593
594 static struct syscore_ops alchemy_usb_pm_ops = {
595 .suspend = alchemy_usb_suspend,
596 .resume = alchemy_usb_resume,
597 };
598
599 static int __init alchemy_usb_init(void)
600 {
601 int ret = 0;
602
603 switch (alchemy_get_cputype()) {
604 case ALCHEMY_CPU_AU1000:
605 case ALCHEMY_CPU_AU1500:
606 case ALCHEMY_CPU_AU1100:
607 ret = au1000_usb_init(AU1000_USB_OHCI_PHYS_ADDR,
608 AU1000_OHCICFG);
609 break;
610 case ALCHEMY_CPU_AU1550:
611 ret = au1000_usb_init(AU1550_USB_OHCI_PHYS_ADDR,
612 AU1550_OHCICFG);
613 break;
614 case ALCHEMY_CPU_AU1200:
615 au1200_usb_init();
616 break;
617 case ALCHEMY_CPU_AU1300:
618 au1300_usb_init();
619 break;
620 }
621
622 if (!ret)
623 register_syscore_ops(&alchemy_usb_pm_ops);
624
625 return ret;
626 }
627 arch_initcall(alchemy_usb_init);
Linux with added FPC-III support