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OMAP3: PM: Added DVFS OPP locking interface for VDD1 and VDD2
[linux-ginger.git] / drivers / ssb / driver_chipcommon.c
blob9681536163caa5bdf7a36fc1dcfff9f8da3a66ec
1 /*
2 * Sonics Silicon Backplane
3 * Broadcom ChipCommon core driver
4 *
5 * Copyright 2005, Broadcom Corporation
6 * Copyright 2006, 2007, Michael Buesch <mb@bu3sch.de>
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 /* chipcommon cores prior to rev6 don't support dynamic clock control */
50 if (ccdev->id.revision < 6)
51 return;
52 /* chipcommon cores rev10 are a whole new ball game */
53 if (ccdev->id.revision >= 10)
54 return;
55 if (!(cc->capabilities & SSB_CHIPCO_CAP_PCTL))
56 return;
57
58 switch (mode) {
59 case SSB_CLKMODE_SLOW:
60 tmp = chipco_read32(cc, SSB_CHIPCO_SLOWCLKCTL);
61 tmp |= SSB_CHIPCO_SLOWCLKCTL_FSLOW;
62 chipco_write32(cc, SSB_CHIPCO_SLOWCLKCTL, tmp);
63 break;
64 case SSB_CLKMODE_FAST:
65 ssb_pci_xtal(bus, SSB_GPIO_XTAL, 1); /* Force crystal on */
66 tmp = chipco_read32(cc, SSB_CHIPCO_SLOWCLKCTL);
67 tmp &= ~SSB_CHIPCO_SLOWCLKCTL_FSLOW;
68 tmp |= SSB_CHIPCO_SLOWCLKCTL_IPLL;
69 chipco_write32(cc, SSB_CHIPCO_SLOWCLKCTL, tmp);
70 break;
71 case SSB_CLKMODE_DYNAMIC:
72 tmp = chipco_read32(cc, SSB_CHIPCO_SLOWCLKCTL);
73 tmp &= ~SSB_CHIPCO_SLOWCLKCTL_FSLOW;
74 tmp &= ~SSB_CHIPCO_SLOWCLKCTL_IPLL;
75 tmp &= ~SSB_CHIPCO_SLOWCLKCTL_ENXTAL;
76 if ((tmp & SSB_CHIPCO_SLOWCLKCTL_SRC) != SSB_CHIPCO_SLOWCLKCTL_SRC_XTAL)
77 tmp |= SSB_CHIPCO_SLOWCLKCTL_ENXTAL;
78 chipco_write32(cc, SSB_CHIPCO_SLOWCLKCTL, tmp);
79
80 /* for dynamic control, we have to release our xtal_pu "force on" */
81 if (tmp & SSB_CHIPCO_SLOWCLKCTL_ENXTAL)
82 ssb_pci_xtal(bus, SSB_GPIO_XTAL, 0);
83 break;
84 default:
85 SSB_WARN_ON(1);
86 }
87 }
88
89 /* Get the Slow Clock Source */
90 static enum ssb_clksrc chipco_pctl_get_slowclksrc(struct ssb_chipcommon *cc)
91 {
92 struct ssb_bus *bus = cc->dev->bus;
93 u32 uninitialized_var(tmp);
94
95 if (cc->dev->id.revision < 6) {
96 if (bus->bustype == SSB_BUSTYPE_SSB ||
97 bus->bustype == SSB_BUSTYPE_PCMCIA)
98 return SSB_CHIPCO_CLKSRC_XTALOS;
99 if (bus->bustype == SSB_BUSTYPE_PCI) {
100 pci_read_config_dword(bus->host_pci, SSB_GPIO_OUT, &tmp);
101 if (tmp & 0x10)
102 return SSB_CHIPCO_CLKSRC_PCI;
103 return SSB_CHIPCO_CLKSRC_XTALOS;
104 }
105 }
106 if (cc->dev->id.revision < 10) {
107 tmp = chipco_read32(cc, SSB_CHIPCO_SLOWCLKCTL);
108 tmp &= 0x7;
109 if (tmp == 0)
110 return SSB_CHIPCO_CLKSRC_LOPWROS;
111 if (tmp == 1)
112 return SSB_CHIPCO_CLKSRC_XTALOS;
113 if (tmp == 2)
114 return SSB_CHIPCO_CLKSRC_PCI;
115 }
116
117 return SSB_CHIPCO_CLKSRC_XTALOS;
118 }
119
120 /* Get maximum or minimum (depending on get_max flag) slowclock frequency. */
121 static int chipco_pctl_clockfreqlimit(struct ssb_chipcommon *cc, int get_max)
122 {
123 int uninitialized_var(limit);
124 enum ssb_clksrc clocksrc;
125 int divisor = 1;
126 u32 tmp;
127
128 clocksrc = chipco_pctl_get_slowclksrc(cc);
129 if (cc->dev->id.revision < 6) {
130 switch (clocksrc) {
131 case SSB_CHIPCO_CLKSRC_PCI:
132 divisor = 64;
133 break;
134 case SSB_CHIPCO_CLKSRC_XTALOS:
135 divisor = 32;
136 break;
137 default:
138 SSB_WARN_ON(1);
139 }
140 } else if (cc->dev->id.revision < 10) {
141 switch (clocksrc) {
142 case SSB_CHIPCO_CLKSRC_LOPWROS:
143 break;
144 case SSB_CHIPCO_CLKSRC_XTALOS:
145 case SSB_CHIPCO_CLKSRC_PCI:
146 tmp = chipco_read32(cc, SSB_CHIPCO_SLOWCLKCTL);
147 divisor = (tmp >> 16) + 1;
148 divisor *= 4;
149 break;
150 }
151 } else {
152 tmp = chipco_read32(cc, SSB_CHIPCO_SYSCLKCTL);
153 divisor = (tmp >> 16) + 1;
154 divisor *= 4;
155 }
156
157 switch (clocksrc) {
158 case SSB_CHIPCO_CLKSRC_LOPWROS:
159 if (get_max)
160 limit = 43000;
161 else
162 limit = 25000;
163 break;
164 case SSB_CHIPCO_CLKSRC_XTALOS:
165 if (get_max)
166 limit = 20200000;
167 else
168 limit = 19800000;
169 break;
170 case SSB_CHIPCO_CLKSRC_PCI:
171 if (get_max)
172 limit = 34000000;
173 else
174 limit = 25000000;
175 break;
176 }
177 limit /= divisor;
178
179 return limit;
180 }
181
182 static void chipco_powercontrol_init(struct ssb_chipcommon *cc)
183 {
184 struct ssb_bus *bus = cc->dev->bus;
185
186 if (bus->chip_id == 0x4321) {
187 if (bus->chip_rev == 0)
188 chipco_write32(cc, SSB_CHIPCO_CHIPCTL, 0x3A4);
189 else if (bus->chip_rev == 1)
190 chipco_write32(cc, SSB_CHIPCO_CHIPCTL, 0xA4);
191 }
192
193 if (!(cc->capabilities & SSB_CHIPCO_CAP_PCTL))
194 return;
195
196 if (cc->dev->id.revision >= 10) {
197 /* Set Idle Power clock rate to 1Mhz */
198 chipco_write32(cc, SSB_CHIPCO_SYSCLKCTL,
199 (chipco_read32(cc, SSB_CHIPCO_SYSCLKCTL) &
200 0x0000FFFF) | 0x00040000);
201 } else {
202 int maxfreq;
203
204 maxfreq = chipco_pctl_clockfreqlimit(cc, 1);
205 chipco_write32(cc, SSB_CHIPCO_PLLONDELAY,
206 (maxfreq * 150 + 999999) / 1000000);
207 chipco_write32(cc, SSB_CHIPCO_FREFSELDELAY,
208 (maxfreq * 15 + 999999) / 1000000);
209 }
210 }
211
212 static void calc_fast_powerup_delay(struct ssb_chipcommon *cc)
213 {
214 struct ssb_bus *bus = cc->dev->bus;
215 int minfreq;
216 unsigned int tmp;
217 u32 pll_on_delay;
218
219 if (bus->bustype != SSB_BUSTYPE_PCI)
220 return;
221 if (!(cc->capabilities & SSB_CHIPCO_CAP_PCTL))
222 return;
223
224 minfreq = chipco_pctl_clockfreqlimit(cc, 0);
225 pll_on_delay = chipco_read32(cc, SSB_CHIPCO_PLLONDELAY);
226 tmp = (((pll_on_delay + 2) * 1000000) + (minfreq - 1)) / minfreq;
227 SSB_WARN_ON(tmp & ~0xFFFF);
228
229 cc->fast_pwrup_delay = tmp;
230 }
231
232 void ssb_chipcommon_init(struct ssb_chipcommon *cc)
233 {
234 if (!cc->dev)
235 return; /* We don't have a ChipCommon */
236 ssb_pmu_init(cc);
237 chipco_powercontrol_init(cc);
238 ssb_chipco_set_clockmode(cc, SSB_CLKMODE_FAST);
239 calc_fast_powerup_delay(cc);
240 }
241
242 void ssb_chipco_suspend(struct ssb_chipcommon *cc)
243 {
244 if (!cc->dev)
245 return;
246 ssb_chipco_set_clockmode(cc, SSB_CLKMODE_SLOW);
247 }
248
249 void ssb_chipco_resume(struct ssb_chipcommon *cc)
250 {
251 if (!cc->dev)
252 return;
253 chipco_powercontrol_init(cc);
254 ssb_chipco_set_clockmode(cc, SSB_CLKMODE_FAST);
255 }
256
257 /* Get the processor clock */
258 void ssb_chipco_get_clockcpu(struct ssb_chipcommon *cc,
259 u32 *plltype, u32 *n, u32 *m)
260 {
261 *n = chipco_read32(cc, SSB_CHIPCO_CLOCK_N);
262 *plltype = (cc->capabilities & SSB_CHIPCO_CAP_PLLT);
263 switch (*plltype) {
264 case SSB_PLLTYPE_2:
265 case SSB_PLLTYPE_4:
266 case SSB_PLLTYPE_6:
267 case SSB_PLLTYPE_7:
268 *m = chipco_read32(cc, SSB_CHIPCO_CLOCK_MIPS);
269 break;
270 case SSB_PLLTYPE_3:
271 /* 5350 uses m2 to control mips */
272 *m = chipco_read32(cc, SSB_CHIPCO_CLOCK_M2);
273 break;
274 default:
275 *m = chipco_read32(cc, SSB_CHIPCO_CLOCK_SB);
276 break;
277 }
278 }
279
280 /* Get the bus clock */
281 void ssb_chipco_get_clockcontrol(struct ssb_chipcommon *cc,
282 u32 *plltype, u32 *n, u32 *m)
283 {
284 *n = chipco_read32(cc, SSB_CHIPCO_CLOCK_N);
285 *plltype = (cc->capabilities & SSB_CHIPCO_CAP_PLLT);
286 switch (*plltype) {
287 case SSB_PLLTYPE_6: /* 100/200 or 120/240 only */
288 *m = chipco_read32(cc, SSB_CHIPCO_CLOCK_MIPS);
289 break;
290 case SSB_PLLTYPE_3: /* 25Mhz, 2 dividers */
291 if (cc->dev->bus->chip_id != 0x5365) {
292 *m = chipco_read32(cc, SSB_CHIPCO_CLOCK_M2);
293 break;
294 }
295 /* Fallthough */
296 default:
297 *m = chipco_read32(cc, SSB_CHIPCO_CLOCK_SB);
298 }
299 }
300
301 void ssb_chipco_timing_init(struct ssb_chipcommon *cc,
302 unsigned long ns)
303 {
304 struct ssb_device *dev = cc->dev;
305 struct ssb_bus *bus = dev->bus;
306 u32 tmp;
307
308 /* set register for external IO to control LED. */
309 chipco_write32(cc, SSB_CHIPCO_PROG_CFG, 0x11);
310 tmp = DIV_ROUND_UP(10, ns) << SSB_PROG_WCNT_3_SHIFT; /* Waitcount-3 = 10ns */
311 tmp |= DIV_ROUND_UP(40, ns) << SSB_PROG_WCNT_1_SHIFT; /* Waitcount-1 = 40ns */
312 tmp |= DIV_ROUND_UP(240, ns); /* Waitcount-0 = 240ns */
313 chipco_write32(cc, SSB_CHIPCO_PROG_WAITCNT, tmp); /* 0x01020a0c for a 100Mhz clock */
314
315 /* Set timing for the flash */
316 tmp = DIV_ROUND_UP(10, ns) << SSB_FLASH_WCNT_3_SHIFT; /* Waitcount-3 = 10nS */
317 tmp |= DIV_ROUND_UP(10, ns) << SSB_FLASH_WCNT_1_SHIFT; /* Waitcount-1 = 10nS */
318 tmp |= DIV_ROUND_UP(120, ns); /* Waitcount-0 = 120nS */
319 if ((bus->chip_id == 0x5365) ||
320 (dev->id.revision < 9))
321 chipco_write32(cc, SSB_CHIPCO_FLASH_WAITCNT, tmp);
322 if ((bus->chip_id == 0x5365) ||
323 (dev->id.revision < 9) ||
324 ((bus->chip_id == 0x5350) && (bus->chip_rev == 0)))
325 chipco_write32(cc, SSB_CHIPCO_PCMCIA_MEMWAIT, tmp);
326
327 if (bus->chip_id == 0x5350) {
328 /* Enable EXTIF */
329 tmp = DIV_ROUND_UP(10, ns) << SSB_PROG_WCNT_3_SHIFT; /* Waitcount-3 = 10ns */
330 tmp |= DIV_ROUND_UP(20, ns) << SSB_PROG_WCNT_2_SHIFT; /* Waitcount-2 = 20ns */
331 tmp |= DIV_ROUND_UP(100, ns) << SSB_PROG_WCNT_1_SHIFT; /* Waitcount-1 = 100ns */
332 tmp |= DIV_ROUND_UP(120, ns); /* Waitcount-0 = 120ns */
333 chipco_write32(cc, SSB_CHIPCO_PROG_WAITCNT, tmp); /* 0x01020a0c for a 100Mhz clock */
334 }
335 }
336
337 /* Set chip watchdog reset timer to fire in 'ticks' backplane cycles */
338 void ssb_chipco_watchdog_timer_set(struct ssb_chipcommon *cc, u32 ticks)
339 {
340 /* instant NMI */
341 chipco_write32(cc, SSB_CHIPCO_WATCHDOG, ticks);
342 }
343
344 void ssb_chipco_irq_mask(struct ssb_chipcommon *cc, u32 mask, u32 value)
345 {
346 chipco_write32_masked(cc, SSB_CHIPCO_IRQMASK, mask, value);
347 }
348
349 u32 ssb_chipco_irq_status(struct ssb_chipcommon *cc, u32 mask)
350 {
351 return chipco_read32(cc, SSB_CHIPCO_IRQSTAT) & mask;
352 }
353
354 u32 ssb_chipco_gpio_in(struct ssb_chipcommon *cc, u32 mask)
355 {
356 return chipco_read32(cc, SSB_CHIPCO_GPIOIN) & mask;
357 }
358
359 u32 ssb_chipco_gpio_out(struct ssb_chipcommon *cc, u32 mask, u32 value)
360 {
361 return chipco_write32_masked(cc, SSB_CHIPCO_GPIOOUT, mask, value);
362 }
363
364 u32 ssb_chipco_gpio_outen(struct ssb_chipcommon *cc, u32 mask, u32 value)
365 {
366 return chipco_write32_masked(cc, SSB_CHIPCO_GPIOOUTEN, mask, value);
367 }
368
369 u32 ssb_chipco_gpio_control(struct ssb_chipcommon *cc, u32 mask, u32 value)
370 {
371 return chipco_write32_masked(cc, SSB_CHIPCO_GPIOCTL, mask, value);
372 }
373
374 u32 ssb_chipco_gpio_intmask(struct ssb_chipcommon *cc, u32 mask, u32 value)
375 {
376 return chipco_write32_masked(cc, SSB_CHIPCO_GPIOIRQ, mask, value);
377 }
378
379 u32 ssb_chipco_gpio_polarity(struct ssb_chipcommon *cc, u32 mask, u32 value)
380 {
381 return chipco_write32_masked(cc, SSB_CHIPCO_GPIOPOL, mask, value);
382 }
383
384 #ifdef CONFIG_SSB_SERIAL
385 int ssb_chipco_serial_init(struct ssb_chipcommon *cc,
386 struct ssb_serial_port *ports)
387 {
388 struct ssb_bus *bus = cc->dev->bus;
389 int nr_ports = 0;
390 u32 plltype;
391 unsigned int irq;
392 u32 baud_base, div;
393 u32 i, n;
394 unsigned int ccrev = cc->dev->id.revision;
395
396 plltype = (cc->capabilities & SSB_CHIPCO_CAP_PLLT);
397 irq = ssb_mips_irq(cc->dev);
398
399 if (plltype == SSB_PLLTYPE_1) {
400 /* PLL clock */
401 baud_base = ssb_calc_clock_rate(plltype,
402 chipco_read32(cc, SSB_CHIPCO_CLOCK_N),
403 chipco_read32(cc, SSB_CHIPCO_CLOCK_M2));
404 div = 1;
405 } else {
406 if (ccrev == 20) {
407 /* BCM5354 uses constant 25MHz clock */
408 baud_base = 25000000;
409 div = 48;
410 /* Set the override bit so we don't divide it */
411 chipco_write32(cc, SSB_CHIPCO_CORECTL,
412 chipco_read32(cc, SSB_CHIPCO_CORECTL)
413 | SSB_CHIPCO_CORECTL_UARTCLK0);
414 } else if ((ccrev >= 11) && (ccrev != 15)) {
415 /* Fixed ALP clock */
416 baud_base = 20000000;
417 if (cc->capabilities & SSB_CHIPCO_CAP_PMU) {
418 /* FIXME: baud_base is different for devices with a PMU */
419 SSB_WARN_ON(1);
420 }
421 div = 1;
422 if (ccrev >= 21) {
423 /* Turn off UART clock before switching clocksource. */
424 chipco_write32(cc, SSB_CHIPCO_CORECTL,
425 chipco_read32(cc, SSB_CHIPCO_CORECTL)
426 & ~SSB_CHIPCO_CORECTL_UARTCLKEN);
427 }
428 /* Set the override bit so we don't divide it */
429 chipco_write32(cc, SSB_CHIPCO_CORECTL,
430 chipco_read32(cc, SSB_CHIPCO_CORECTL)
431 | SSB_CHIPCO_CORECTL_UARTCLK0);
432 if (ccrev >= 21) {
433 /* Re-enable the UART clock. */
434 chipco_write32(cc, SSB_CHIPCO_CORECTL,
435 chipco_read32(cc, SSB_CHIPCO_CORECTL)
436 | SSB_CHIPCO_CORECTL_UARTCLKEN);
437 }
438 } else if (ccrev >= 3) {
439 /* Internal backplane clock */
440 baud_base = ssb_clockspeed(bus);
441 div = chipco_read32(cc, SSB_CHIPCO_CLKDIV)
442 & SSB_CHIPCO_CLKDIV_UART;
443 } else {
444 /* Fixed internal backplane clock */
445 baud_base = 88000000;
446 div = 48;
447 }
448
449 /* Clock source depends on strapping if UartClkOverride is unset */
450 if ((ccrev > 0) &&
451 !(chipco_read32(cc, SSB_CHIPCO_CORECTL) & SSB_CHIPCO_CORECTL_UARTCLK0)) {
452 if ((cc->capabilities & SSB_CHIPCO_CAP_UARTCLK) ==
453 SSB_CHIPCO_CAP_UARTCLK_INT) {
454 /* Internal divided backplane clock */
455 baud_base /= div;
456 } else {
457 /* Assume external clock of 1.8432 MHz */
458 baud_base = 1843200;
459 }
460 }
461 }
462
463 /* Determine the registers of the UARTs */
464 n = (cc->capabilities & SSB_CHIPCO_CAP_NRUART);
465 for (i = 0; i < n; i++) {
466 void __iomem *cc_mmio;
467 void __iomem *uart_regs;
468
469 cc_mmio = cc->dev->bus->mmio + (cc->dev->core_index * SSB_CORE_SIZE);
470 uart_regs = cc_mmio + SSB_CHIPCO_UART0_DATA;
471 /* Offset changed at after rev 0 */
472 if (ccrev == 0)
473 uart_regs += (i * 8);
474 else
475 uart_regs += (i * 256);
476
477 nr_ports++;
478 ports[i].regs = uart_regs;
479 ports[i].irq = irq;
480 ports[i].baud_base = baud_base;
481 ports[i].reg_shift = 0;
482 }
483
484 return nr_ports;
485 }
486 #endif /* CONFIG_SSB_SERIAL */
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