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Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/dtor/input
[linux-btrfs-devel.git] / drivers / ssb / driver_chipcommon.c
blob5d9c97c24797200c3b69634ff29f75271977d1b4
1 /*
2 * Sonics Silicon Backplane
3 * Broadcom ChipCommon core driver
4 *
5 * Copyright 2005, Broadcom Corporation
6 * Copyright 2006, 2007, Michael Buesch <m@bues.ch>
7 *
8 * Licensed under the GNU/GPL. See COPYING for details.
9 */
10
11 #include <linux/ssb/ssb.h>
12 #include <linux/ssb/ssb_regs.h>
13 #include <linux/pci.h>
14
15 #include "ssb_private.h"
16
17
18 /* Clock sources */
19 enum ssb_clksrc {
20 /* PCI clock */
21 SSB_CHIPCO_CLKSRC_PCI,
22 /* Crystal slow clock oscillator */
23 SSB_CHIPCO_CLKSRC_XTALOS,
24 /* Low power oscillator */
25 SSB_CHIPCO_CLKSRC_LOPWROS,
26 };
27
28
29 static inline u32 chipco_write32_masked(struct ssb_chipcommon *cc, u16 offset,
30 u32 mask, u32 value)
31 {
32 value &= mask;
33 value |= chipco_read32(cc, offset) & ~mask;
34 chipco_write32(cc, offset, value);
35
36 return value;
37 }
38
39 void ssb_chipco_set_clockmode(struct ssb_chipcommon *cc,
40 enum ssb_clkmode mode)
41 {
42 struct ssb_device *ccdev = cc->dev;
43 struct ssb_bus *bus;
44 u32 tmp;
45
46 if (!ccdev)
47 return;
48 bus = ccdev->bus;
49
50 /* We support SLOW only on 6..9 */
51 if (ccdev->id.revision >= 10 && mode == SSB_CLKMODE_SLOW)
52 mode = SSB_CLKMODE_DYNAMIC;
53
54 if (cc->capabilities & SSB_CHIPCO_CAP_PMU)
55 return; /* PMU controls clockmode, separated function needed */
56 SSB_WARN_ON(ccdev->id.revision >= 20);
57
58 /* chipcommon cores prior to rev6 don't support dynamic clock control */
59 if (ccdev->id.revision < 6)
60 return;
61
62 /* ChipCommon cores rev10+ need testing */
63 if (ccdev->id.revision >= 10)
64 return;
65
66 if (!(cc->capabilities & SSB_CHIPCO_CAP_PCTL))
67 return;
68
69 switch (mode) {
70 case SSB_CLKMODE_SLOW: /* For revs 6..9 only */
71 tmp = chipco_read32(cc, SSB_CHIPCO_SLOWCLKCTL);
72 tmp |= SSB_CHIPCO_SLOWCLKCTL_FSLOW;
73 chipco_write32(cc, SSB_CHIPCO_SLOWCLKCTL, tmp);
74 break;
75 case SSB_CLKMODE_FAST:
76 if (ccdev->id.revision < 10) {
77 ssb_pci_xtal(bus, SSB_GPIO_XTAL, 1); /* Force crystal on */
78 tmp = chipco_read32(cc, SSB_CHIPCO_SLOWCLKCTL);
79 tmp &= ~SSB_CHIPCO_SLOWCLKCTL_FSLOW;
80 tmp |= SSB_CHIPCO_SLOWCLKCTL_IPLL;
81 chipco_write32(cc, SSB_CHIPCO_SLOWCLKCTL, tmp);
82 } else {
83 chipco_write32(cc, SSB_CHIPCO_SYSCLKCTL,
84 (chipco_read32(cc, SSB_CHIPCO_SYSCLKCTL) |
85 SSB_CHIPCO_SYSCLKCTL_FORCEHT));
86 /* udelay(150); TODO: not available in early init */
87 }
88 break;
89 case SSB_CLKMODE_DYNAMIC:
90 if (ccdev->id.revision < 10) {
91 tmp = chipco_read32(cc, SSB_CHIPCO_SLOWCLKCTL);
92 tmp &= ~SSB_CHIPCO_SLOWCLKCTL_FSLOW;
93 tmp &= ~SSB_CHIPCO_SLOWCLKCTL_IPLL;
94 tmp &= ~SSB_CHIPCO_SLOWCLKCTL_ENXTAL;
95 if ((tmp & SSB_CHIPCO_SLOWCLKCTL_SRC) !=
96 SSB_CHIPCO_SLOWCLKCTL_SRC_XTAL)
97 tmp |= SSB_CHIPCO_SLOWCLKCTL_ENXTAL;
98 chipco_write32(cc, SSB_CHIPCO_SLOWCLKCTL, tmp);
99
100 /* For dynamic control, we have to release our xtal_pu
101 * "force on" */
102 if (tmp & SSB_CHIPCO_SLOWCLKCTL_ENXTAL)
103 ssb_pci_xtal(bus, SSB_GPIO_XTAL, 0);
104 } else {
105 chipco_write32(cc, SSB_CHIPCO_SYSCLKCTL,
106 (chipco_read32(cc, SSB_CHIPCO_SYSCLKCTL) &
107 ~SSB_CHIPCO_SYSCLKCTL_FORCEHT));
108 }
109 break;
110 default:
111 SSB_WARN_ON(1);
112 }
113 }
114
115 /* Get the Slow Clock Source */
116 static enum ssb_clksrc chipco_pctl_get_slowclksrc(struct ssb_chipcommon *cc)
117 {
118 struct ssb_bus *bus = cc->dev->bus;
119 u32 uninitialized_var(tmp);
120
121 if (cc->dev->id.revision < 6) {
122 if (bus->bustype == SSB_BUSTYPE_SSB ||
123 bus->bustype == SSB_BUSTYPE_PCMCIA)
124 return SSB_CHIPCO_CLKSRC_XTALOS;
125 if (bus->bustype == SSB_BUSTYPE_PCI) {
126 pci_read_config_dword(bus->host_pci, SSB_GPIO_OUT, &tmp);
127 if (tmp & 0x10)
128 return SSB_CHIPCO_CLKSRC_PCI;
129 return SSB_CHIPCO_CLKSRC_XTALOS;
130 }
131 }
132 if (cc->dev->id.revision < 10) {
133 tmp = chipco_read32(cc, SSB_CHIPCO_SLOWCLKCTL);
134 tmp &= 0x7;
135 if (tmp == 0)
136 return SSB_CHIPCO_CLKSRC_LOPWROS;
137 if (tmp == 1)
138 return SSB_CHIPCO_CLKSRC_XTALOS;
139 if (tmp == 2)
140 return SSB_CHIPCO_CLKSRC_PCI;
141 }
142
143 return SSB_CHIPCO_CLKSRC_XTALOS;
144 }
145
146 /* Get maximum or minimum (depending on get_max flag) slowclock frequency. */
147 static int chipco_pctl_clockfreqlimit(struct ssb_chipcommon *cc, int get_max)
148 {
149 int uninitialized_var(limit);
150 enum ssb_clksrc clocksrc;
151 int divisor = 1;
152 u32 tmp;
153
154 clocksrc = chipco_pctl_get_slowclksrc(cc);
155 if (cc->dev->id.revision < 6) {
156 switch (clocksrc) {
157 case SSB_CHIPCO_CLKSRC_PCI:
158 divisor = 64;
159 break;
160 case SSB_CHIPCO_CLKSRC_XTALOS:
161 divisor = 32;
162 break;
163 default:
164 SSB_WARN_ON(1);
165 }
166 } else if (cc->dev->id.revision < 10) {
167 switch (clocksrc) {
168 case SSB_CHIPCO_CLKSRC_LOPWROS:
169 break;
170 case SSB_CHIPCO_CLKSRC_XTALOS:
171 case SSB_CHIPCO_CLKSRC_PCI:
172 tmp = chipco_read32(cc, SSB_CHIPCO_SLOWCLKCTL);
173 divisor = (tmp >> 16) + 1;
174 divisor *= 4;
175 break;
176 }
177 } else {
178 tmp = chipco_read32(cc, SSB_CHIPCO_SYSCLKCTL);
179 divisor = (tmp >> 16) + 1;
180 divisor *= 4;
181 }
182
183 switch (clocksrc) {
184 case SSB_CHIPCO_CLKSRC_LOPWROS:
185 if (get_max)
186 limit = 43000;
187 else
188 limit = 25000;
189 break;
190 case SSB_CHIPCO_CLKSRC_XTALOS:
191 if (get_max)
192 limit = 20200000;
193 else
194 limit = 19800000;
195 break;
196 case SSB_CHIPCO_CLKSRC_PCI:
197 if (get_max)
198 limit = 34000000;
199 else
200 limit = 25000000;
201 break;
202 }
203 limit /= divisor;
204
205 return limit;
206 }
207
208 static void chipco_powercontrol_init(struct ssb_chipcommon *cc)
209 {
210 struct ssb_bus *bus = cc->dev->bus;
211
212 if (bus->chip_id == 0x4321) {
213 if (bus->chip_rev == 0)
214 chipco_write32(cc, SSB_CHIPCO_CHIPCTL, 0x3A4);
215 else if (bus->chip_rev == 1)
216 chipco_write32(cc, SSB_CHIPCO_CHIPCTL, 0xA4);
217 }
218
219 if (!(cc->capabilities & SSB_CHIPCO_CAP_PCTL))
220 return;
221
222 if (cc->dev->id.revision >= 10) {
223 /* Set Idle Power clock rate to 1Mhz */
224 chipco_write32(cc, SSB_CHIPCO_SYSCLKCTL,
225 (chipco_read32(cc, SSB_CHIPCO_SYSCLKCTL) &
226 0x0000FFFF) | 0x00040000);
227 } else {
228 int maxfreq;
229
230 maxfreq = chipco_pctl_clockfreqlimit(cc, 1);
231 chipco_write32(cc, SSB_CHIPCO_PLLONDELAY,
232 (maxfreq * 150 + 999999) / 1000000);
233 chipco_write32(cc, SSB_CHIPCO_FREFSELDELAY,
234 (maxfreq * 15 + 999999) / 1000000);
235 }
236 }
237
238 /* http://bcm-v4.sipsolutions.net/802.11/PmuFastPwrupDelay */
239 static u16 pmu_fast_powerup_delay(struct ssb_chipcommon *cc)
240 {
241 struct ssb_bus *bus = cc->dev->bus;
242
243 switch (bus->chip_id) {
244 case 0x4312:
245 case 0x4322:
246 case 0x4328:
247 return 7000;
248 case 0x4325:
249 /* TODO: */
250 default:
251 return 15000;
252 }
253 }
254
255 /* http://bcm-v4.sipsolutions.net/802.11/ClkctlFastPwrupDelay */
256 static void calc_fast_powerup_delay(struct ssb_chipcommon *cc)
257 {
258 struct ssb_bus *bus = cc->dev->bus;
259 int minfreq;
260 unsigned int tmp;
261 u32 pll_on_delay;
262
263 if (bus->bustype != SSB_BUSTYPE_PCI)
264 return;
265
266 if (cc->capabilities & SSB_CHIPCO_CAP_PMU) {
267 cc->fast_pwrup_delay = pmu_fast_powerup_delay(cc);
268 return;
269 }
270
271 if (!(cc->capabilities & SSB_CHIPCO_CAP_PCTL))
272 return;
273
274 minfreq = chipco_pctl_clockfreqlimit(cc, 0);
275 pll_on_delay = chipco_read32(cc, SSB_CHIPCO_PLLONDELAY);
276 tmp = (((pll_on_delay + 2) * 1000000) + (minfreq - 1)) / minfreq;
277 SSB_WARN_ON(tmp & ~0xFFFF);
278
279 cc->fast_pwrup_delay = tmp;
280 }
281
282 void ssb_chipcommon_init(struct ssb_chipcommon *cc)
283 {
284 if (!cc->dev)
285 return; /* We don't have a ChipCommon */
286 if (cc->dev->id.revision >= 11)
287 cc->status = chipco_read32(cc, SSB_CHIPCO_CHIPSTAT);
288 ssb_dprintk(KERN_INFO PFX "chipcommon status is 0x%x\n", cc->status);
289
290 if (cc->dev->id.revision >= 20) {
291 chipco_write32(cc, SSB_CHIPCO_GPIOPULLUP, 0);
292 chipco_write32(cc, SSB_CHIPCO_GPIOPULLDOWN, 0);
293 }
294
295 ssb_pmu_init(cc);
296 chipco_powercontrol_init(cc);
297 ssb_chipco_set_clockmode(cc, SSB_CLKMODE_FAST);
298 calc_fast_powerup_delay(cc);
299 }
300
301 void ssb_chipco_suspend(struct ssb_chipcommon *cc)
302 {
303 if (!cc->dev)
304 return;
305 ssb_chipco_set_clockmode(cc, SSB_CLKMODE_SLOW);
306 }
307
308 void ssb_chipco_resume(struct ssb_chipcommon *cc)
309 {
310 if (!cc->dev)
311 return;
312 chipco_powercontrol_init(cc);
313 ssb_chipco_set_clockmode(cc, SSB_CLKMODE_FAST);
314 }
315
316 /* Get the processor clock */
317 void ssb_chipco_get_clockcpu(struct ssb_chipcommon *cc,
318 u32 *plltype, u32 *n, u32 *m)
319 {
320 *n = chipco_read32(cc, SSB_CHIPCO_CLOCK_N);
321 *plltype = (cc->capabilities & SSB_CHIPCO_CAP_PLLT);
322 switch (*plltype) {
323 case SSB_PLLTYPE_2:
324 case SSB_PLLTYPE_4:
325 case SSB_PLLTYPE_6:
326 case SSB_PLLTYPE_7:
327 *m = chipco_read32(cc, SSB_CHIPCO_CLOCK_MIPS);
328 break;
329 case SSB_PLLTYPE_3:
330 /* 5350 uses m2 to control mips */
331 *m = chipco_read32(cc, SSB_CHIPCO_CLOCK_M2);
332 break;
333 default:
334 *m = chipco_read32(cc, SSB_CHIPCO_CLOCK_SB);
335 break;
336 }
337 }
338
339 /* Get the bus clock */
340 void ssb_chipco_get_clockcontrol(struct ssb_chipcommon *cc,
341 u32 *plltype, u32 *n, u32 *m)
342 {
343 *n = chipco_read32(cc, SSB_CHIPCO_CLOCK_N);
344 *plltype = (cc->capabilities & SSB_CHIPCO_CAP_PLLT);
345 switch (*plltype) {
346 case SSB_PLLTYPE_6: /* 100/200 or 120/240 only */
347 *m = chipco_read32(cc, SSB_CHIPCO_CLOCK_MIPS);
348 break;
349 case SSB_PLLTYPE_3: /* 25Mhz, 2 dividers */
350 if (cc->dev->bus->chip_id != 0x5365) {
351 *m = chipco_read32(cc, SSB_CHIPCO_CLOCK_M2);
352 break;
353 }
354 /* Fallthough */
355 default:
356 *m = chipco_read32(cc, SSB_CHIPCO_CLOCK_SB);
357 }
358 }
359
360 void ssb_chipco_timing_init(struct ssb_chipcommon *cc,
361 unsigned long ns)
362 {
363 struct ssb_device *dev = cc->dev;
364 struct ssb_bus *bus = dev->bus;
365 u32 tmp;
366
367 /* set register for external IO to control LED. */
368 chipco_write32(cc, SSB_CHIPCO_PROG_CFG, 0x11);
369 tmp = DIV_ROUND_UP(10, ns) << SSB_PROG_WCNT_3_SHIFT; /* Waitcount-3 = 10ns */
370 tmp |= DIV_ROUND_UP(40, ns) << SSB_PROG_WCNT_1_SHIFT; /* Waitcount-1 = 40ns */
371 tmp |= DIV_ROUND_UP(240, ns); /* Waitcount-0 = 240ns */
372 chipco_write32(cc, SSB_CHIPCO_PROG_WAITCNT, tmp); /* 0x01020a0c for a 100Mhz clock */
373
374 /* Set timing for the flash */
375 tmp = DIV_ROUND_UP(10, ns) << SSB_FLASH_WCNT_3_SHIFT; /* Waitcount-3 = 10nS */
376 tmp |= DIV_ROUND_UP(10, ns) << SSB_FLASH_WCNT_1_SHIFT; /* Waitcount-1 = 10nS */
377 tmp |= DIV_ROUND_UP(120, ns); /* Waitcount-0 = 120nS */
378 if ((bus->chip_id == 0x5365) ||
379 (dev->id.revision < 9))
380 chipco_write32(cc, SSB_CHIPCO_FLASH_WAITCNT, tmp);
381 if ((bus->chip_id == 0x5365) ||
382 (dev->id.revision < 9) ||
383 ((bus->chip_id == 0x5350) && (bus->chip_rev == 0)))
384 chipco_write32(cc, SSB_CHIPCO_PCMCIA_MEMWAIT, tmp);
385
386 if (bus->chip_id == 0x5350) {
387 /* Enable EXTIF */
388 tmp = DIV_ROUND_UP(10, ns) << SSB_PROG_WCNT_3_SHIFT; /* Waitcount-3 = 10ns */
389 tmp |= DIV_ROUND_UP(20, ns) << SSB_PROG_WCNT_2_SHIFT; /* Waitcount-2 = 20ns */
390 tmp |= DIV_ROUND_UP(100, ns) << SSB_PROG_WCNT_1_SHIFT; /* Waitcount-1 = 100ns */
391 tmp |= DIV_ROUND_UP(120, ns); /* Waitcount-0 = 120ns */
392 chipco_write32(cc, SSB_CHIPCO_PROG_WAITCNT, tmp); /* 0x01020a0c for a 100Mhz clock */
393 }
394 }
395
396 /* Set chip watchdog reset timer to fire in 'ticks' backplane cycles */
397 void ssb_chipco_watchdog_timer_set(struct ssb_chipcommon *cc, u32 ticks)
398 {
399 /* instant NMI */
400 chipco_write32(cc, SSB_CHIPCO_WATCHDOG, ticks);
401 }
402
403 void ssb_chipco_irq_mask(struct ssb_chipcommon *cc, u32 mask, u32 value)
404 {
405 chipco_write32_masked(cc, SSB_CHIPCO_IRQMASK, mask, value);
406 }
407
408 u32 ssb_chipco_irq_status(struct ssb_chipcommon *cc, u32 mask)
409 {
410 return chipco_read32(cc, SSB_CHIPCO_IRQSTAT) & mask;
411 }
412
413 u32 ssb_chipco_gpio_in(struct ssb_chipcommon *cc, u32 mask)
414 {
415 return chipco_read32(cc, SSB_CHIPCO_GPIOIN) & mask;
416 }
417
418 u32 ssb_chipco_gpio_out(struct ssb_chipcommon *cc, u32 mask, u32 value)
419 {
420 return chipco_write32_masked(cc, SSB_CHIPCO_GPIOOUT, mask, value);
421 }
422
423 u32 ssb_chipco_gpio_outen(struct ssb_chipcommon *cc, u32 mask, u32 value)
424 {
425 return chipco_write32_masked(cc, SSB_CHIPCO_GPIOOUTEN, mask, value);
426 }
427
428 u32 ssb_chipco_gpio_control(struct ssb_chipcommon *cc, u32 mask, u32 value)
429 {
430 return chipco_write32_masked(cc, SSB_CHIPCO_GPIOCTL, mask, value);
431 }
432 EXPORT_SYMBOL(ssb_chipco_gpio_control);
433
434 u32 ssb_chipco_gpio_intmask(struct ssb_chipcommon *cc, u32 mask, u32 value)
435 {
436 return chipco_write32_masked(cc, SSB_CHIPCO_GPIOIRQ, mask, value);
437 }
438
439 u32 ssb_chipco_gpio_polarity(struct ssb_chipcommon *cc, u32 mask, u32 value)
440 {
441 return chipco_write32_masked(cc, SSB_CHIPCO_GPIOPOL, mask, value);
442 }
443
444 #ifdef CONFIG_SSB_SERIAL
445 int ssb_chipco_serial_init(struct ssb_chipcommon *cc,
446 struct ssb_serial_port *ports)
447 {
448 struct ssb_bus *bus = cc->dev->bus;
449 int nr_ports = 0;
450 u32 plltype;
451 unsigned int irq;
452 u32 baud_base, div;
453 u32 i, n;
454 unsigned int ccrev = cc->dev->id.revision;
455
456 plltype = (cc->capabilities & SSB_CHIPCO_CAP_PLLT);
457 irq = ssb_mips_irq(cc->dev);
458
459 if (plltype == SSB_PLLTYPE_1) {
460 /* PLL clock */
461 baud_base = ssb_calc_clock_rate(plltype,
462 chipco_read32(cc, SSB_CHIPCO_CLOCK_N),
463 chipco_read32(cc, SSB_CHIPCO_CLOCK_M2));
464 div = 1;
465 } else {
466 if (ccrev == 20) {
467 /* BCM5354 uses constant 25MHz clock */
468 baud_base = 25000000;
469 div = 48;
470 /* Set the override bit so we don't divide it */
471 chipco_write32(cc, SSB_CHIPCO_CORECTL,
472 chipco_read32(cc, SSB_CHIPCO_CORECTL)
473 | SSB_CHIPCO_CORECTL_UARTCLK0);
474 } else if ((ccrev >= 11) && (ccrev != 15)) {
475 /* Fixed ALP clock */
476 baud_base = 20000000;
477 if (cc->capabilities & SSB_CHIPCO_CAP_PMU) {
478 /* FIXME: baud_base is different for devices with a PMU */
479 SSB_WARN_ON(1);
480 }
481 div = 1;
482 if (ccrev >= 21) {
483 /* Turn off UART clock before switching clocksource. */
484 chipco_write32(cc, SSB_CHIPCO_CORECTL,
485 chipco_read32(cc, SSB_CHIPCO_CORECTL)
486 & ~SSB_CHIPCO_CORECTL_UARTCLKEN);
487 }
488 /* Set the override bit so we don't divide it */
489 chipco_write32(cc, SSB_CHIPCO_CORECTL,
490 chipco_read32(cc, SSB_CHIPCO_CORECTL)
491 | SSB_CHIPCO_CORECTL_UARTCLK0);
492 if (ccrev >= 21) {
493 /* Re-enable the UART clock. */
494 chipco_write32(cc, SSB_CHIPCO_CORECTL,
495 chipco_read32(cc, SSB_CHIPCO_CORECTL)
496 | SSB_CHIPCO_CORECTL_UARTCLKEN);
497 }
498 } else if (ccrev >= 3) {
499 /* Internal backplane clock */
500 baud_base = ssb_clockspeed(bus);
501 div = chipco_read32(cc, SSB_CHIPCO_CLKDIV)
502 & SSB_CHIPCO_CLKDIV_UART;
503 } else {
504 /* Fixed internal backplane clock */
505 baud_base = 88000000;
506 div = 48;
507 }
508
509 /* Clock source depends on strapping if UartClkOverride is unset */
510 if ((ccrev > 0) &&
511 !(chipco_read32(cc, SSB_CHIPCO_CORECTL) & SSB_CHIPCO_CORECTL_UARTCLK0)) {
512 if ((cc->capabilities & SSB_CHIPCO_CAP_UARTCLK) ==
513 SSB_CHIPCO_CAP_UARTCLK_INT) {
514 /* Internal divided backplane clock */
515 baud_base /= div;
516 } else {
517 /* Assume external clock of 1.8432 MHz */
518 baud_base = 1843200;
519 }
520 }
521 }
522
523 /* Determine the registers of the UARTs */
524 n = (cc->capabilities & SSB_CHIPCO_CAP_NRUART);
525 for (i = 0; i < n; i++) {
526 void __iomem *cc_mmio;
527 void __iomem *uart_regs;
528
529 cc_mmio = cc->dev->bus->mmio + (cc->dev->core_index * SSB_CORE_SIZE);
530 uart_regs = cc_mmio + SSB_CHIPCO_UART0_DATA;
531 /* Offset changed at after rev 0 */
532 if (ccrev == 0)
533 uart_regs += (i * 8);
534 else
535 uart_regs += (i * 256);
536
537 nr_ports++;
538 ports[i].regs = uart_regs;
539 ports[i].irq = irq;
540 ports[i].baud_base = baud_base;
541 ports[i].reg_shift = 0;
542 }
543
544 return nr_ports;
545 }
546 #endif /* CONFIG_SSB_SERIAL */
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