1 /*
2 * Broadcom specific AMBA
3 * ChipCommon core driver
4 *
5 * Copyright 2005, Broadcom Corporation
6 * Copyright 2006, 2007, Michael Buesch <m@bues.ch>
7 * Copyright 2012, Hauke Mehrtens <hauke@hauke-m.de>
8 *
9 * Licensed under the GNU/GPL. See COPYING for details.
10 */
11
12 #include "bcma_private.h"
13 #include <linux/bcm47xx_wdt.h>
14 #include <linux/export.h>
15 #include <linux/platform_device.h>
16 #include <linux/bcma/bcma.h>
17
bcma_cc_write32_masked(struct bcma_drv_cc * cc,u16 offset,u32 mask,u32 value)18 static inline u32 bcma_cc_write32_masked(struct bcma_drv_cc *cc, u16 offset,
19 u32 mask, u32 value)
20 {
21 value &= mask;
22 value |= bcma_cc_read32(cc, offset) & ~mask;
23 bcma_cc_write32(cc, offset, value);
24
25 return value;
26 }
27
bcma_chipco_get_alp_clock(struct bcma_drv_cc * cc)28 u32 bcma_chipco_get_alp_clock(struct bcma_drv_cc *cc)
29 {
30 if (cc->capabilities & BCMA_CC_CAP_PMU)
31 return bcma_pmu_get_alp_clock(cc);
32
33 return 20000000;
34 }
35 EXPORT_SYMBOL_GPL(bcma_chipco_get_alp_clock);
36
bcma_core_cc_has_pmu_watchdog(struct bcma_drv_cc * cc)37 static bool bcma_core_cc_has_pmu_watchdog(struct bcma_drv_cc *cc)
38 {
39 struct bcma_bus *bus = cc->core->bus;
40
41 if (cc->capabilities & BCMA_CC_CAP_PMU) {
42 if (bus->chipinfo.id == BCMA_CHIP_ID_BCM53573) {
43 WARN(bus->chipinfo.rev <= 1, "No watchdog available\n");
44 /* 53573B0 and 53573B1 have bugged PMU watchdog. It can
45 * be enabled but timer can't be bumped. Use CC one
46 * instead.
47 */
48 return false;
49 }
50 return true;
51 } else {
52 return false;
53 }
54 }
55
bcma_chipco_watchdog_get_max_timer(struct bcma_drv_cc * cc)56 static u32 bcma_chipco_watchdog_get_max_timer(struct bcma_drv_cc *cc)
57 {
58 struct bcma_bus *bus = cc->core->bus;
59 u32 nb;
60
61 if (bcma_core_cc_has_pmu_watchdog(cc)) {
62 if (bus->chipinfo.id == BCMA_CHIP_ID_BCM4706)
63 nb = 32;
64 else if (cc->core->id.rev < 26)
65 nb = 16;
66 else
67 nb = (cc->core->id.rev >= 37) ? 32 : 24;
68 } else {
69 nb = 28;
70 }
71 if (nb == 32)
72 return 0xffffffff;
73 else
74 return (1 << nb) - 1;
75 }
76
bcma_chipco_watchdog_timer_set_wdt(struct bcm47xx_wdt * wdt,u32 ticks)77 static u32 bcma_chipco_watchdog_timer_set_wdt(struct bcm47xx_wdt *wdt,
78 u32 ticks)
79 {
80 struct bcma_drv_cc *cc = bcm47xx_wdt_get_drvdata(wdt);
81
82 return bcma_chipco_watchdog_timer_set(cc, ticks);
83 }
84
bcma_chipco_watchdog_timer_set_ms_wdt(struct bcm47xx_wdt * wdt,u32 ms)85 static u32 bcma_chipco_watchdog_timer_set_ms_wdt(struct bcm47xx_wdt *wdt,
86 u32 ms)
87 {
88 struct bcma_drv_cc *cc = bcm47xx_wdt_get_drvdata(wdt);
89 u32 ticks;
90
91 ticks = bcma_chipco_watchdog_timer_set(cc, cc->ticks_per_ms * ms);
92 return ticks / cc->ticks_per_ms;
93 }
94
bcma_chipco_watchdog_ticks_per_ms(struct bcma_drv_cc * cc)95 static int bcma_chipco_watchdog_ticks_per_ms(struct bcma_drv_cc *cc)
96 {
97 struct bcma_bus *bus = cc->core->bus;
98
99 if (cc->capabilities & BCMA_CC_CAP_PMU) {
100 if (bus->chipinfo.id == BCMA_CHIP_ID_BCM4706)
101 /* 4706 CC and PMU watchdogs are clocked at 1/4 of ALP
102 * clock
103 */
104 return bcma_chipco_get_alp_clock(cc) / 4000;
105 else
106 /* based on 32KHz ILP clock */
107 return 32;
108 } else {
109 return bcma_chipco_get_alp_clock(cc) / 1000;
110 }
111 }
112
bcma_chipco_watchdog_register(struct bcma_drv_cc * cc)113 int bcma_chipco_watchdog_register(struct bcma_drv_cc *cc)
114 {
115 struct bcma_bus *bus = cc->core->bus;
116 struct bcm47xx_wdt wdt = {};
117 struct platform_device *pdev;
118
119 if (bus->chipinfo.id == BCMA_CHIP_ID_BCM53573 &&
120 bus->chipinfo.rev <= 1) {
121 pr_debug("No watchdog on 53573A0 / 53573A1\n");
122 return 0;
123 }
124
125 wdt.driver_data = cc;
126 wdt.timer_set = bcma_chipco_watchdog_timer_set_wdt;
127 wdt.timer_set_ms = bcma_chipco_watchdog_timer_set_ms_wdt;
128 wdt.max_timer_ms =
129 bcma_chipco_watchdog_get_max_timer(cc) / cc->ticks_per_ms;
130
131 pdev = platform_device_register_data(NULL, "bcm47xx-wdt",
132 bus->num, &wdt,
133 sizeof(wdt));
134 if (IS_ERR(pdev))
135 return PTR_ERR(pdev);
136
137 cc->watchdog = pdev;
138
139 return 0;
140 }
141
bcma_core_chipcommon_flash_detect(struct bcma_drv_cc * cc)142 static void bcma_core_chipcommon_flash_detect(struct bcma_drv_cc *cc)
143 {
144 struct bcma_bus *bus = cc->core->bus;
145
146 switch (cc->capabilities & BCMA_CC_CAP_FLASHT) {
147 case BCMA_CC_FLASHT_STSER:
148 case BCMA_CC_FLASHT_ATSER:
149 bcma_debug(bus, "Found serial flash\n");
150 bcma_sflash_init(cc);
151 break;
152 case BCMA_CC_FLASHT_PARA:
153 bcma_debug(bus, "Found parallel flash\n");
154 bcma_pflash_init(cc);
155 break;
156 default:
157 bcma_err(bus, "Flash type not supported\n");
158 }
159
160 if (cc->core->id.rev == 38 ||
161 bus->chipinfo.id == BCMA_CHIP_ID_BCM4706) {
162 if (cc->capabilities & BCMA_CC_CAP_NFLASH) {
163 bcma_debug(bus, "Found NAND flash\n");
164 bcma_nflash_init(cc);
165 }
166 }
167 }
168
bcma_core_chipcommon_early_init(struct bcma_drv_cc * cc)169 void bcma_core_chipcommon_early_init(struct bcma_drv_cc *cc)
170 {
171 struct bcma_bus *bus = cc->core->bus;
172
173 if (cc->early_setup_done)
174 return;
175
176 spin_lock_init(&cc->gpio_lock);
177
178 if (cc->core->id.rev >= 11)
179 cc->status = bcma_cc_read32(cc, BCMA_CC_CHIPSTAT);
180 cc->capabilities = bcma_cc_read32(cc, BCMA_CC_CAP);
181 if (cc->core->id.rev >= 35)
182 cc->capabilities_ext = bcma_cc_read32(cc, BCMA_CC_CAP_EXT);
183
184 if (cc->capabilities & BCMA_CC_CAP_PMU)
185 bcma_pmu_early_init(cc);
186
187 if (bus->hosttype == BCMA_HOSTTYPE_SOC)
188 bcma_core_chipcommon_flash_detect(cc);
189
190 cc->early_setup_done = true;
191 }
192
bcma_core_chipcommon_init(struct bcma_drv_cc * cc)193 void bcma_core_chipcommon_init(struct bcma_drv_cc *cc)
194 {
195 u32 leddc_on = 10;
196 u32 leddc_off = 90;
197
198 if (cc->setup_done)
199 return;
200
201 bcma_core_chipcommon_early_init(cc);
202
203 if (cc->core->id.rev >= 20) {
204 u32 pullup = 0, pulldown = 0;
205
206 if (cc->core->bus->chipinfo.id == BCMA_CHIP_ID_BCM43142) {
207 pullup = 0x402e0;
208 pulldown = 0x20500;
209 }
210
211 bcma_cc_write32(cc, BCMA_CC_GPIOPULLUP, pullup);
212 bcma_cc_write32(cc, BCMA_CC_GPIOPULLDOWN, pulldown);
213 }
214
215 if (cc->capabilities & BCMA_CC_CAP_PMU)
216 bcma_pmu_init(cc);
217 if (cc->capabilities & BCMA_CC_CAP_PCTL)
218 bcma_err(cc->core->bus, "Power control not implemented!\n");
219
220 if (cc->core->id.rev >= 16) {
221 if (cc->core->bus->sprom.leddc_on_time &&
222 cc->core->bus->sprom.leddc_off_time) {
223 leddc_on = cc->core->bus->sprom.leddc_on_time;
224 leddc_off = cc->core->bus->sprom.leddc_off_time;
225 }
226 bcma_cc_write32(cc, BCMA_CC_GPIOTIMER,
227 ((leddc_on << BCMA_CC_GPIOTIMER_ONTIME_SHIFT) |
228 (leddc_off << BCMA_CC_GPIOTIMER_OFFTIME_SHIFT)));
229 }
230 cc->ticks_per_ms = bcma_chipco_watchdog_ticks_per_ms(cc);
231
232 cc->setup_done = true;
233 }
234
235 /* Set chip watchdog reset timer to fire in 'ticks' backplane cycles */
bcma_chipco_watchdog_timer_set(struct bcma_drv_cc * cc,u32 ticks)236 u32 bcma_chipco_watchdog_timer_set(struct bcma_drv_cc *cc, u32 ticks)
237 {
238 u32 maxt;
239
240 maxt = bcma_chipco_watchdog_get_max_timer(cc);
241 if (bcma_core_cc_has_pmu_watchdog(cc)) {
242 if (ticks == 1)
243 ticks = 2;
244 else if (ticks > maxt)
245 ticks = maxt;
246 bcma_pmu_write32(cc, BCMA_CC_PMU_WATCHDOG, ticks);
247 } else {
248 struct bcma_bus *bus = cc->core->bus;
249
250 if (bus->chipinfo.id != BCMA_CHIP_ID_BCM4707 &&
251 bus->chipinfo.id != BCMA_CHIP_ID_BCM47094 &&
252 bus->chipinfo.id != BCMA_CHIP_ID_BCM53018)
253 bcma_core_set_clockmode(cc->core,
254 ticks ? BCMA_CLKMODE_FAST : BCMA_CLKMODE_DYNAMIC);
255
256 if (ticks > maxt)
257 ticks = maxt;
258 /* instant NMI */
259 bcma_cc_write32(cc, BCMA_CC_WATCHDOG, ticks);
260 }
261 return ticks;
262 }
263
bcma_chipco_irq_mask(struct bcma_drv_cc * cc,u32 mask,u32 value)264 void bcma_chipco_irq_mask(struct bcma_drv_cc *cc, u32 mask, u32 value)
265 {
266 bcma_cc_write32_masked(cc, BCMA_CC_IRQMASK, mask, value);
267 }
268
bcma_chipco_irq_status(struct bcma_drv_cc * cc,u32 mask)269 u32 bcma_chipco_irq_status(struct bcma_drv_cc *cc, u32 mask)
270 {
271 return bcma_cc_read32(cc, BCMA_CC_IRQSTAT) & mask;
272 }
273
bcma_chipco_gpio_in(struct bcma_drv_cc * cc,u32 mask)274 u32 bcma_chipco_gpio_in(struct bcma_drv_cc *cc, u32 mask)
275 {
276 return bcma_cc_read32(cc, BCMA_CC_GPIOIN) & mask;
277 }
278
bcma_chipco_gpio_out(struct bcma_drv_cc * cc,u32 mask,u32 value)279 u32 bcma_chipco_gpio_out(struct bcma_drv_cc *cc, u32 mask, u32 value)
280 {
281 unsigned long flags;
282 u32 res;
283
284 spin_lock_irqsave(&cc->gpio_lock, flags);
285 res = bcma_cc_write32_masked(cc, BCMA_CC_GPIOOUT, mask, value);
286 spin_unlock_irqrestore(&cc->gpio_lock, flags);
287
288 return res;
289 }
290 EXPORT_SYMBOL_GPL(bcma_chipco_gpio_out);
291
bcma_chipco_gpio_outen(struct bcma_drv_cc * cc,u32 mask,u32 value)292 u32 bcma_chipco_gpio_outen(struct bcma_drv_cc *cc, u32 mask, u32 value)
293 {
294 unsigned long flags;
295 u32 res;
296
297 spin_lock_irqsave(&cc->gpio_lock, flags);
298 res = bcma_cc_write32_masked(cc, BCMA_CC_GPIOOUTEN, mask, value);
299 spin_unlock_irqrestore(&cc->gpio_lock, flags);
300
301 return res;
302 }
303 EXPORT_SYMBOL_GPL(bcma_chipco_gpio_outen);
304
305 /*
306 * If the bit is set to 0, chipcommon controls this GPIO,
307 * if the bit is set to 1, it is used by some part of the chip and not our code.
308 */
bcma_chipco_gpio_control(struct bcma_drv_cc * cc,u32 mask,u32 value)309 u32 bcma_chipco_gpio_control(struct bcma_drv_cc *cc, u32 mask, u32 value)
310 {
311 unsigned long flags;
312 u32 res;
313
314 spin_lock_irqsave(&cc->gpio_lock, flags);
315 res = bcma_cc_write32_masked(cc, BCMA_CC_GPIOCTL, mask, value);
316 spin_unlock_irqrestore(&cc->gpio_lock, flags);
317
318 return res;
319 }
320 EXPORT_SYMBOL_GPL(bcma_chipco_gpio_control);
321
bcma_chipco_gpio_intmask(struct bcma_drv_cc * cc,u32 mask,u32 value)322 u32 bcma_chipco_gpio_intmask(struct bcma_drv_cc *cc, u32 mask, u32 value)
323 {
324 unsigned long flags;
325 u32 res;
326
327 spin_lock_irqsave(&cc->gpio_lock, flags);
328 res = bcma_cc_write32_masked(cc, BCMA_CC_GPIOIRQ, mask, value);
329 spin_unlock_irqrestore(&cc->gpio_lock, flags);
330
331 return res;
332 }
333
bcma_chipco_gpio_polarity(struct bcma_drv_cc * cc,u32 mask,u32 value)334 u32 bcma_chipco_gpio_polarity(struct bcma_drv_cc *cc, u32 mask, u32 value)
335 {
336 unsigned long flags;
337 u32 res;
338
339 spin_lock_irqsave(&cc->gpio_lock, flags);
340 res = bcma_cc_write32_masked(cc, BCMA_CC_GPIOPOL, mask, value);
341 spin_unlock_irqrestore(&cc->gpio_lock, flags);
342
343 return res;
344 }
345
bcma_chipco_gpio_pullup(struct bcma_drv_cc * cc,u32 mask,u32 value)346 u32 bcma_chipco_gpio_pullup(struct bcma_drv_cc *cc, u32 mask, u32 value)
347 {
348 unsigned long flags;
349 u32 res;
350
351 if (cc->core->id.rev < 20)
352 return 0;
353
354 spin_lock_irqsave(&cc->gpio_lock, flags);
355 res = bcma_cc_write32_masked(cc, BCMA_CC_GPIOPULLUP, mask, value);
356 spin_unlock_irqrestore(&cc->gpio_lock, flags);
357
358 return res;
359 }
360
bcma_chipco_gpio_pulldown(struct bcma_drv_cc * cc,u32 mask,u32 value)361 u32 bcma_chipco_gpio_pulldown(struct bcma_drv_cc *cc, u32 mask, u32 value)
362 {
363 unsigned long flags;
364 u32 res;
365
366 if (cc->core->id.rev < 20)
367 return 0;
368
369 spin_lock_irqsave(&cc->gpio_lock, flags);
370 res = bcma_cc_write32_masked(cc, BCMA_CC_GPIOPULLDOWN, mask, value);
371 spin_unlock_irqrestore(&cc->gpio_lock, flags);
372
373 return res;
374 }
375
376 #ifdef CONFIG_BCMA_DRIVER_MIPS
bcma_chipco_serial_init(struct bcma_drv_cc * cc)377 void bcma_chipco_serial_init(struct bcma_drv_cc *cc)
378 {
379 unsigned int irq;
380 u32 baud_base;
381 u32 i;
382 unsigned int ccrev = cc->core->id.rev;
383 struct bcma_serial_port *ports = cc->serial_ports;
384
385 if (ccrev >= 11 && ccrev != 15) {
386 baud_base = bcma_chipco_get_alp_clock(cc);
387 if (ccrev >= 21) {
388 /* Turn off UART clock before switching clocksource. */
389 bcma_cc_write32(cc, BCMA_CC_CORECTL,
390 bcma_cc_read32(cc, BCMA_CC_CORECTL)
391 & ~BCMA_CC_CORECTL_UARTCLKEN);
392 }
393 /* Set the override bit so we don't divide it */
394 bcma_cc_write32(cc, BCMA_CC_CORECTL,
395 bcma_cc_read32(cc, BCMA_CC_CORECTL)
396 | BCMA_CC_CORECTL_UARTCLK0);
397 if (ccrev >= 21) {
398 /* Re-enable the UART clock. */
399 bcma_cc_write32(cc, BCMA_CC_CORECTL,
400 bcma_cc_read32(cc, BCMA_CC_CORECTL)
401 | BCMA_CC_CORECTL_UARTCLKEN);
402 }
403 } else {
404 bcma_err(cc->core->bus, "serial not supported on this device ccrev: 0x%x\n",
405 ccrev);
406 return;
407 }
408
409 irq = bcma_core_irq(cc->core, 0);
410
411 /* Determine the registers of the UARTs */
412 cc->nr_serial_ports = (cc->capabilities & BCMA_CC_CAP_NRUART);
413 for (i = 0; i < cc->nr_serial_ports; i++) {
414 ports[i].regs = cc->core->io_addr + BCMA_CC_UART0_DATA +
415 (i * 256);
416 ports[i].irq = irq;
417 ports[i].baud_base = baud_base;
418 ports[i].reg_shift = 0;
419 }
420 }
421 #endif /* CONFIG_BCMA_DRIVER_MIPS */
422