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OMAPDSS: VENC: fix NULL pointer dereference in DSS2 VENC sysfs debug attr on OMAP4
[zen-stable.git] / drivers / ssb / driver_chipcommon.c
blobe9d2ca11283b3e60fd8d63a31bf59b739135739e
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/export.h>
14 #include <linux/pci.h>
15
16 #include "ssb_private.h"
17
18
19 /* Clock sources */
20 enum ssb_clksrc {
21 /* PCI clock */
22 SSB_CHIPCO_CLKSRC_PCI,
23 /* Crystal slow clock oscillator */
24 SSB_CHIPCO_CLKSRC_XTALOS,
25 /* Low power oscillator */
26 SSB_CHIPCO_CLKSRC_LOPWROS,
27 };
28
29
30 static inline u32 chipco_write32_masked(struct ssb_chipcommon *cc, u16 offset,
31 u32 mask, u32 value)
32 {
33 value &= mask;
34 value |= chipco_read32(cc, offset) & ~mask;
35 chipco_write32(cc, offset, value);
36
37 return value;
38 }
39
40 void ssb_chipco_set_clockmode(struct ssb_chipcommon *cc,
41 enum ssb_clkmode mode)
42 {
43 struct ssb_device *ccdev = cc->dev;
44 struct ssb_bus *bus;
45 u32 tmp;
46
47 if (!ccdev)
48 return;
49 bus = ccdev->bus;
50
51 /* We support SLOW only on 6..9 */
52 if (ccdev->id.revision >= 10 && mode == SSB_CLKMODE_SLOW)
53 mode = SSB_CLKMODE_DYNAMIC;
54
55 if (cc->capabilities & SSB_CHIPCO_CAP_PMU)
56 return; /* PMU controls clockmode, separated function needed */
57 SSB_WARN_ON(ccdev->id.revision >= 20);
58
59 /* chipcommon cores prior to rev6 don't support dynamic clock control */
60 if (ccdev->id.revision < 6)
61 return;
62
63 /* ChipCommon cores rev10+ need testing */
64 if (ccdev->id.revision >= 10)
65 return;
66
67 if (!(cc->capabilities & SSB_CHIPCO_CAP_PCTL))
68 return;
69
70 switch (mode) {
71 case SSB_CLKMODE_SLOW: /* For revs 6..9 only */
72 tmp = chipco_read32(cc, SSB_CHIPCO_SLOWCLKCTL);
73 tmp |= SSB_CHIPCO_SLOWCLKCTL_FSLOW;
74 chipco_write32(cc, SSB_CHIPCO_SLOWCLKCTL, tmp);
75 break;
76 case SSB_CLKMODE_FAST:
77 if (ccdev->id.revision < 10) {
78 ssb_pci_xtal(bus, SSB_GPIO_XTAL, 1); /* Force crystal on */
79 tmp = chipco_read32(cc, SSB_CHIPCO_SLOWCLKCTL);
80 tmp &= ~SSB_CHIPCO_SLOWCLKCTL_FSLOW;
81 tmp |= SSB_CHIPCO_SLOWCLKCTL_IPLL;
82 chipco_write32(cc, SSB_CHIPCO_SLOWCLKCTL, tmp);
83 } else {
84 chipco_write32(cc, SSB_CHIPCO_SYSCLKCTL,
85 (chipco_read32(cc, SSB_CHIPCO_SYSCLKCTL) |
86 SSB_CHIPCO_SYSCLKCTL_FORCEHT));
87 /* udelay(150); TODO: not available in early init */
88 }
89 break;
90 case SSB_CLKMODE_DYNAMIC:
91 if (ccdev->id.revision < 10) {
92 tmp = chipco_read32(cc, SSB_CHIPCO_SLOWCLKCTL);
93 tmp &= ~SSB_CHIPCO_SLOWCLKCTL_FSLOW;
94 tmp &= ~SSB_CHIPCO_SLOWCLKCTL_IPLL;
95 tmp &= ~SSB_CHIPCO_SLOWCLKCTL_ENXTAL;
96 if ((tmp & SSB_CHIPCO_SLOWCLKCTL_SRC) !=
97 SSB_CHIPCO_SLOWCLKCTL_SRC_XTAL)
98 tmp |= SSB_CHIPCO_SLOWCLKCTL_ENXTAL;
99 chipco_write32(cc, SSB_CHIPCO_SLOWCLKCTL, tmp);
100
101 /* For dynamic control, we have to release our xtal_pu
102 * "force on" */
103 if (tmp & SSB_CHIPCO_SLOWCLKCTL_ENXTAL)
104 ssb_pci_xtal(bus, SSB_GPIO_XTAL, 0);
105 } else {
106 chipco_write32(cc, SSB_CHIPCO_SYSCLKCTL,
107 (chipco_read32(cc, SSB_CHIPCO_SYSCLKCTL) &
108 ~SSB_CHIPCO_SYSCLKCTL_FORCEHT));
109 }
110 break;
111 default:
112 SSB_WARN_ON(1);
113 }
114 }
115
116 /* Get the Slow Clock Source */
117 static enum ssb_clksrc chipco_pctl_get_slowclksrc(struct ssb_chipcommon *cc)
118 {
119 struct ssb_bus *bus = cc->dev->bus;
120 u32 uninitialized_var(tmp);
121
122 if (cc->dev->id.revision < 6) {
123 if (bus->bustype == SSB_BUSTYPE_SSB ||
124 bus->bustype == SSB_BUSTYPE_PCMCIA)
125 return SSB_CHIPCO_CLKSRC_XTALOS;
126 if (bus->bustype == SSB_BUSTYPE_PCI) {
127 pci_read_config_dword(bus->host_pci, SSB_GPIO_OUT, &tmp);
128 if (tmp & 0x10)
129 return SSB_CHIPCO_CLKSRC_PCI;
130 return SSB_CHIPCO_CLKSRC_XTALOS;
131 }
132 }
133 if (cc->dev->id.revision < 10) {
134 tmp = chipco_read32(cc, SSB_CHIPCO_SLOWCLKCTL);
135 tmp &= 0x7;
136 if (tmp == 0)
137 return SSB_CHIPCO_CLKSRC_LOPWROS;
138 if (tmp == 1)
139 return SSB_CHIPCO_CLKSRC_XTALOS;
140 if (tmp == 2)
141 return SSB_CHIPCO_CLKSRC_PCI;
142 }
143
144 return SSB_CHIPCO_CLKSRC_XTALOS;
145 }
146
147 /* Get maximum or minimum (depending on get_max flag) slowclock frequency. */
148 static int chipco_pctl_clockfreqlimit(struct ssb_chipcommon *cc, int get_max)
149 {
150 int uninitialized_var(limit);
151 enum ssb_clksrc clocksrc;
152 int divisor = 1;
153 u32 tmp;
154
155 clocksrc = chipco_pctl_get_slowclksrc(cc);
156 if (cc->dev->id.revision < 6) {
157 switch (clocksrc) {
158 case SSB_CHIPCO_CLKSRC_PCI:
159 divisor = 64;
160 break;
161 case SSB_CHIPCO_CLKSRC_XTALOS:
162 divisor = 32;
163 break;
164 default:
165 SSB_WARN_ON(1);
166 }
167 } else if (cc->dev->id.revision < 10) {
168 switch (clocksrc) {
169 case SSB_CHIPCO_CLKSRC_LOPWROS:
170 break;
171 case SSB_CHIPCO_CLKSRC_XTALOS:
172 case SSB_CHIPCO_CLKSRC_PCI:
173 tmp = chipco_read32(cc, SSB_CHIPCO_SLOWCLKCTL);
174 divisor = (tmp >> 16) + 1;
175 divisor *= 4;
176 break;
177 }
178 } else {
179 tmp = chipco_read32(cc, SSB_CHIPCO_SYSCLKCTL);
180 divisor = (tmp >> 16) + 1;
181 divisor *= 4;
182 }
183
184 switch (clocksrc) {
185 case SSB_CHIPCO_CLKSRC_LOPWROS:
186 if (get_max)
187 limit = 43000;
188 else
189 limit = 25000;
190 break;
191 case SSB_CHIPCO_CLKSRC_XTALOS:
192 if (get_max)
193 limit = 20200000;
194 else
195 limit = 19800000;
196 break;
197 case SSB_CHIPCO_CLKSRC_PCI:
198 if (get_max)
199 limit = 34000000;
200 else
201 limit = 25000000;
202 break;
203 }
204 limit /= divisor;
205
206 return limit;
207 }
208
209 static void chipco_powercontrol_init(struct ssb_chipcommon *cc)
210 {
211 struct ssb_bus *bus = cc->dev->bus;
212
213 if (bus->chip_id == 0x4321) {
214 if (bus->chip_rev == 0)
215 chipco_write32(cc, SSB_CHIPCO_CHIPCTL, 0x3A4);
216 else if (bus->chip_rev == 1)
217 chipco_write32(cc, SSB_CHIPCO_CHIPCTL, 0xA4);
218 }
219
220 if (!(cc->capabilities & SSB_CHIPCO_CAP_PCTL))
221 return;
222
223 if (cc->dev->id.revision >= 10) {
224 /* Set Idle Power clock rate to 1Mhz */
225 chipco_write32(cc, SSB_CHIPCO_SYSCLKCTL,
226 (chipco_read32(cc, SSB_CHIPCO_SYSCLKCTL) &
227 0x0000FFFF) | 0x00040000);
228 } else {
229 int maxfreq;
230
231 maxfreq = chipco_pctl_clockfreqlimit(cc, 1);
232 chipco_write32(cc, SSB_CHIPCO_PLLONDELAY,
233 (maxfreq * 150 + 999999) / 1000000);
234 chipco_write32(cc, SSB_CHIPCO_FREFSELDELAY,
235 (maxfreq * 15 + 999999) / 1000000);
236 }
237 }
238
239 /* http://bcm-v4.sipsolutions.net/802.11/PmuFastPwrupDelay */
240 static u16 pmu_fast_powerup_delay(struct ssb_chipcommon *cc)
241 {
242 struct ssb_bus *bus = cc->dev->bus;
243
244 switch (bus->chip_id) {
245 case 0x4312:
246 case 0x4322:
247 case 0x4328:
248 return 7000;
249 case 0x4325:
250 /* TODO: */
251 default:
252 return 15000;
253 }
254 }
255
256 /* http://bcm-v4.sipsolutions.net/802.11/ClkctlFastPwrupDelay */
257 static void calc_fast_powerup_delay(struct ssb_chipcommon *cc)
258 {
259 struct ssb_bus *bus = cc->dev->bus;
260 int minfreq;
261 unsigned int tmp;
262 u32 pll_on_delay;
263
264 if (bus->bustype != SSB_BUSTYPE_PCI)
265 return;
266
267 if (cc->capabilities & SSB_CHIPCO_CAP_PMU) {
268 cc->fast_pwrup_delay = pmu_fast_powerup_delay(cc);
269 return;
270 }
271
272 if (!(cc->capabilities & SSB_CHIPCO_CAP_PCTL))
273 return;
274
275 minfreq = chipco_pctl_clockfreqlimit(cc, 0);
276 pll_on_delay = chipco_read32(cc, SSB_CHIPCO_PLLONDELAY);
277 tmp = (((pll_on_delay + 2) * 1000000) + (minfreq - 1)) / minfreq;
278 SSB_WARN_ON(tmp & ~0xFFFF);
279
280 cc->fast_pwrup_delay = tmp;
281 }
282
283 void ssb_chipcommon_init(struct ssb_chipcommon *cc)
284 {
285 if (!cc->dev)
286 return; /* We don't have a ChipCommon */
287 if (cc->dev->id.revision >= 11)
288 cc->status = chipco_read32(cc, SSB_CHIPCO_CHIPSTAT);
289 ssb_dprintk(KERN_INFO PFX "chipcommon status is 0x%x\n", cc->status);
290
291 if (cc->dev->id.revision >= 20) {
292 chipco_write32(cc, SSB_CHIPCO_GPIOPULLUP, 0);
293 chipco_write32(cc, SSB_CHIPCO_GPIOPULLDOWN, 0);
294 }
295
296 ssb_pmu_init(cc);
297 chipco_powercontrol_init(cc);
298 ssb_chipco_set_clockmode(cc, SSB_CLKMODE_FAST);
299 calc_fast_powerup_delay(cc);
300 }
301
302 void ssb_chipco_suspend(struct ssb_chipcommon *cc)
303 {
304 if (!cc->dev)
305 return;
306 ssb_chipco_set_clockmode(cc, SSB_CLKMODE_SLOW);
307 }
308
309 void ssb_chipco_resume(struct ssb_chipcommon *cc)
310 {
311 if (!cc->dev)
312 return;
313 chipco_powercontrol_init(cc);
314 ssb_chipco_set_clockmode(cc, SSB_CLKMODE_FAST);
315 }
316
317 /* Get the processor clock */
318 void ssb_chipco_get_clockcpu(struct ssb_chipcommon *cc,
319 u32 *plltype, u32 *n, u32 *m)
320 {
321 *n = chipco_read32(cc, SSB_CHIPCO_CLOCK_N);
322 *plltype = (cc->capabilities & SSB_CHIPCO_CAP_PLLT);
323 switch (*plltype) {
324 case SSB_PLLTYPE_2:
325 case SSB_PLLTYPE_4:
326 case SSB_PLLTYPE_6:
327 case SSB_PLLTYPE_7:
328 *m = chipco_read32(cc, SSB_CHIPCO_CLOCK_MIPS);
329 break;
330 case SSB_PLLTYPE_3:
331 /* 5350 uses m2 to control mips */
332 *m = chipco_read32(cc, SSB_CHIPCO_CLOCK_M2);
333 break;
334 default:
335 *m = chipco_read32(cc, SSB_CHIPCO_CLOCK_SB);
336 break;
337 }
338 }
339
340 /* Get the bus clock */
341 void ssb_chipco_get_clockcontrol(struct ssb_chipcommon *cc,
342 u32 *plltype, u32 *n, u32 *m)
343 {
344 *n = chipco_read32(cc, SSB_CHIPCO_CLOCK_N);
345 *plltype = (cc->capabilities & SSB_CHIPCO_CAP_PLLT);
346 switch (*plltype) {
347 case SSB_PLLTYPE_6: /* 100/200 or 120/240 only */
348 *m = chipco_read32(cc, SSB_CHIPCO_CLOCK_MIPS);
349 break;
350 case SSB_PLLTYPE_3: /* 25Mhz, 2 dividers */
351 if (cc->dev->bus->chip_id != 0x5365) {
352 *m = chipco_read32(cc, SSB_CHIPCO_CLOCK_M2);
353 break;
354 }
355 /* Fallthough */
356 default:
357 *m = chipco_read32(cc, SSB_CHIPCO_CLOCK_SB);
358 }
359 }
360
361 void ssb_chipco_timing_init(struct ssb_chipcommon *cc,
362 unsigned long ns)
363 {
364 struct ssb_device *dev = cc->dev;
365 struct ssb_bus *bus = dev->bus;
366 u32 tmp;
367
368 /* set register for external IO to control LED. */
369 chipco_write32(cc, SSB_CHIPCO_PROG_CFG, 0x11);
370 tmp = DIV_ROUND_UP(10, ns) << SSB_PROG_WCNT_3_SHIFT; /* Waitcount-3 = 10ns */
371 tmp |= DIV_ROUND_UP(40, ns) << SSB_PROG_WCNT_1_SHIFT; /* Waitcount-1 = 40ns */
372 tmp |= DIV_ROUND_UP(240, ns); /* Waitcount-0 = 240ns */
373 chipco_write32(cc, SSB_CHIPCO_PROG_WAITCNT, tmp); /* 0x01020a0c for a 100Mhz clock */
374
375 /* Set timing for the flash */
376 tmp = DIV_ROUND_UP(10, ns) << SSB_FLASH_WCNT_3_SHIFT; /* Waitcount-3 = 10nS */
377 tmp |= DIV_ROUND_UP(10, ns) << SSB_FLASH_WCNT_1_SHIFT; /* Waitcount-1 = 10nS */
378 tmp |= DIV_ROUND_UP(120, ns); /* Waitcount-0 = 120nS */
379 if ((bus->chip_id == 0x5365) ||
380 (dev->id.revision < 9))
381 chipco_write32(cc, SSB_CHIPCO_FLASH_WAITCNT, tmp);
382 if ((bus->chip_id == 0x5365) ||
383 (dev->id.revision < 9) ||
384 ((bus->chip_id == 0x5350) && (bus->chip_rev == 0)))
385 chipco_write32(cc, SSB_CHIPCO_PCMCIA_MEMWAIT, tmp);
386
387 if (bus->chip_id == 0x5350) {
388 /* Enable EXTIF */
389 tmp = DIV_ROUND_UP(10, ns) << SSB_PROG_WCNT_3_SHIFT; /* Waitcount-3 = 10ns */
390 tmp |= DIV_ROUND_UP(20, ns) << SSB_PROG_WCNT_2_SHIFT; /* Waitcount-2 = 20ns */
391 tmp |= DIV_ROUND_UP(100, ns) << SSB_PROG_WCNT_1_SHIFT; /* Waitcount-1 = 100ns */
392 tmp |= DIV_ROUND_UP(120, ns); /* Waitcount-0 = 120ns */
393 chipco_write32(cc, SSB_CHIPCO_PROG_WAITCNT, tmp); /* 0x01020a0c for a 100Mhz clock */
394 }
395 }
396
397 /* Set chip watchdog reset timer to fire in 'ticks' backplane cycles */
398 void ssb_chipco_watchdog_timer_set(struct ssb_chipcommon *cc, u32 ticks)
399 {
400 /* instant NMI */
401 chipco_write32(cc, SSB_CHIPCO_WATCHDOG, ticks);
402 }
403
404 void ssb_chipco_irq_mask(struct ssb_chipcommon *cc, u32 mask, u32 value)
405 {
406 chipco_write32_masked(cc, SSB_CHIPCO_IRQMASK, mask, value);
407 }
408
409 u32 ssb_chipco_irq_status(struct ssb_chipcommon *cc, u32 mask)
410 {
411 return chipco_read32(cc, SSB_CHIPCO_IRQSTAT) & mask;
412 }
413
414 u32 ssb_chipco_gpio_in(struct ssb_chipcommon *cc, u32 mask)
415 {
416 return chipco_read32(cc, SSB_CHIPCO_GPIOIN) & mask;
417 }
418
419 u32 ssb_chipco_gpio_out(struct ssb_chipcommon *cc, u32 mask, u32 value)
420 {
421 return chipco_write32_masked(cc, SSB_CHIPCO_GPIOOUT, mask, value);
422 }
423
424 u32 ssb_chipco_gpio_outen(struct ssb_chipcommon *cc, u32 mask, u32 value)
425 {
426 return chipco_write32_masked(cc, SSB_CHIPCO_GPIOOUTEN, mask, value);
427 }
428
429 u32 ssb_chipco_gpio_control(struct ssb_chipcommon *cc, u32 mask, u32 value)
430 {
431 return chipco_write32_masked(cc, SSB_CHIPCO_GPIOCTL, mask, value);
432 }
433 EXPORT_SYMBOL(ssb_chipco_gpio_control);
434
435 u32 ssb_chipco_gpio_intmask(struct ssb_chipcommon *cc, u32 mask, u32 value)
436 {
437 return chipco_write32_masked(cc, SSB_CHIPCO_GPIOIRQ, mask, value);
438 }
439
440 u32 ssb_chipco_gpio_polarity(struct ssb_chipcommon *cc, u32 mask, u32 value)
441 {
442 return chipco_write32_masked(cc, SSB_CHIPCO_GPIOPOL, mask, value);
443 }
444
445 #ifdef CONFIG_SSB_SERIAL
446 int ssb_chipco_serial_init(struct ssb_chipcommon *cc,
447 struct ssb_serial_port *ports)
448 {
449 struct ssb_bus *bus = cc->dev->bus;
450 int nr_ports = 0;
451 u32 plltype;
452 unsigned int irq;
453 u32 baud_base, div;
454 u32 i, n;
455 unsigned int ccrev = cc->dev->id.revision;
456
457 plltype = (cc->capabilities & SSB_CHIPCO_CAP_PLLT);
458 irq = ssb_mips_irq(cc->dev);
459
460 if (plltype == SSB_PLLTYPE_1) {
461 /* PLL clock */
462 baud_base = ssb_calc_clock_rate(plltype,
463 chipco_read32(cc, SSB_CHIPCO_CLOCK_N),
464 chipco_read32(cc, SSB_CHIPCO_CLOCK_M2));
465 div = 1;
466 } else {
467 if (ccrev == 20) {
468 /* BCM5354 uses constant 25MHz clock */
469 baud_base = 25000000;
470 div = 48;
471 /* Set the override bit so we don't divide it */
472 chipco_write32(cc, SSB_CHIPCO_CORECTL,
473 chipco_read32(cc, SSB_CHIPCO_CORECTL)
474 | SSB_CHIPCO_CORECTL_UARTCLK0);
475 } else if ((ccrev >= 11) && (ccrev != 15)) {
476 /* Fixed ALP clock */
477 baud_base = 20000000;
478 if (cc->capabilities & SSB_CHIPCO_CAP_PMU) {
479 /* FIXME: baud_base is different for devices with a PMU */
480 SSB_WARN_ON(1);
481 }
482 div = 1;
483 if (ccrev >= 21) {
484 /* Turn off UART clock before switching clocksource. */
485 chipco_write32(cc, SSB_CHIPCO_CORECTL,
486 chipco_read32(cc, SSB_CHIPCO_CORECTL)
487 & ~SSB_CHIPCO_CORECTL_UARTCLKEN);
488 }
489 /* Set the override bit so we don't divide it */
490 chipco_write32(cc, SSB_CHIPCO_CORECTL,
491 chipco_read32(cc, SSB_CHIPCO_CORECTL)
492 | SSB_CHIPCO_CORECTL_UARTCLK0);
493 if (ccrev >= 21) {
494 /* Re-enable the UART clock. */
495 chipco_write32(cc, SSB_CHIPCO_CORECTL,
496 chipco_read32(cc, SSB_CHIPCO_CORECTL)
497 | SSB_CHIPCO_CORECTL_UARTCLKEN);
498 }
499 } else if (ccrev >= 3) {
500 /* Internal backplane clock */
501 baud_base = ssb_clockspeed(bus);
502 div = chipco_read32(cc, SSB_CHIPCO_CLKDIV)
503 & SSB_CHIPCO_CLKDIV_UART;
504 } else {
505 /* Fixed internal backplane clock */
506 baud_base = 88000000;
507 div = 48;
508 }
509
510 /* Clock source depends on strapping if UartClkOverride is unset */
511 if ((ccrev > 0) &&
512 !(chipco_read32(cc, SSB_CHIPCO_CORECTL) & SSB_CHIPCO_CORECTL_UARTCLK0)) {
513 if ((cc->capabilities & SSB_CHIPCO_CAP_UARTCLK) ==
514 SSB_CHIPCO_CAP_UARTCLK_INT) {
515 /* Internal divided backplane clock */
516 baud_base /= div;
517 } else {
518 /* Assume external clock of 1.8432 MHz */
519 baud_base = 1843200;
520 }
521 }
522 }
523
524 /* Determine the registers of the UARTs */
525 n = (cc->capabilities & SSB_CHIPCO_CAP_NRUART);
526 for (i = 0; i < n; i++) {
527 void __iomem *cc_mmio;
528 void __iomem *uart_regs;
529
530 cc_mmio = cc->dev->bus->mmio + (cc->dev->core_index * SSB_CORE_SIZE);
531 uart_regs = cc_mmio + SSB_CHIPCO_UART0_DATA;
532 /* Offset changed at after rev 0 */
533 if (ccrev == 0)
534 uart_regs += (i * 8);
535 else
536 uart_regs += (i * 256);
537
538 nr_ports++;
539 ports[i].regs = uart_regs;
540 ports[i].irq = irq;
541 ports[i].baud_base = baud_base;
542 ports[i].reg_shift = 0;
543 }
544
545 return nr_ports;
546 }
547 #endif /* CONFIG_SSB_SERIAL */