Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
tjh.dev
kernel
os
linux
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
18static void bcma_chipco_serial_init(struct bcma_drv_cc *cc);
19
20static inline u32 bcma_cc_write32_masked(struct bcma_drv_cc *cc, u16 offset,
21 u32 mask, u32 value)
22{
23 value &= mask;
24 value |= bcma_cc_read32(cc, offset) & ~mask;
25 bcma_cc_write32(cc, offset, value);
26
27 return value;
28}
29
30u32 bcma_chipco_get_alp_clock(struct bcma_drv_cc *cc)
31{
32 if (cc->capabilities & BCMA_CC_CAP_PMU)
33 return bcma_pmu_get_alp_clock(cc);
34
35 return 20000000;
36}
37EXPORT_SYMBOL_GPL(bcma_chipco_get_alp_clock);
38
39static u32 bcma_chipco_watchdog_get_max_timer(struct bcma_drv_cc *cc)
40{
41 struct bcma_bus *bus = cc->core->bus;
42 u32 nb;
43
44 if (cc->capabilities & BCMA_CC_CAP_PMU) {
45 if (bus->chipinfo.id == BCMA_CHIP_ID_BCM4706)
46 nb = 32;
47 else if (cc->core->id.rev < 26)
48 nb = 16;
49 else
50 nb = (cc->core->id.rev >= 37) ? 32 : 24;
51 } else {
52 nb = 28;
53 }
54 if (nb == 32)
55 return 0xffffffff;
56 else
57 return (1 << nb) - 1;
58}
59
60static u32 bcma_chipco_watchdog_timer_set_wdt(struct bcm47xx_wdt *wdt,
61 u32 ticks)
62{
63 struct bcma_drv_cc *cc = bcm47xx_wdt_get_drvdata(wdt);
64
65 return bcma_chipco_watchdog_timer_set(cc, ticks);
66}
67
68static u32 bcma_chipco_watchdog_timer_set_ms_wdt(struct bcm47xx_wdt *wdt,
69 u32 ms)
70{
71 struct bcma_drv_cc *cc = bcm47xx_wdt_get_drvdata(wdt);
72 u32 ticks;
73
74 ticks = bcma_chipco_watchdog_timer_set(cc, cc->ticks_per_ms * ms);
75 return ticks / cc->ticks_per_ms;
76}
77
78static int bcma_chipco_watchdog_ticks_per_ms(struct bcma_drv_cc *cc)
79{
80 struct bcma_bus *bus = cc->core->bus;
81
82 if (cc->capabilities & BCMA_CC_CAP_PMU) {
83 if (bus->chipinfo.id == BCMA_CHIP_ID_BCM4706)
84 /* 4706 CC and PMU watchdogs are clocked at 1/4 of ALP
85 * clock
86 */
87 return bcma_chipco_get_alp_clock(cc) / 4000;
88 else
89 /* based on 32KHz ILP clock */
90 return 32;
91 } else {
92 return bcma_chipco_get_alp_clock(cc) / 1000;
93 }
94}
95
96int bcma_chipco_watchdog_register(struct bcma_drv_cc *cc)
97{
98 struct bcm47xx_wdt wdt = {};
99 struct platform_device *pdev;
100
101 wdt.driver_data = cc;
102 wdt.timer_set = bcma_chipco_watchdog_timer_set_wdt;
103 wdt.timer_set_ms = bcma_chipco_watchdog_timer_set_ms_wdt;
104 wdt.max_timer_ms =
105 bcma_chipco_watchdog_get_max_timer(cc) / cc->ticks_per_ms;
106
107 pdev = platform_device_register_data(NULL, "bcm47xx-wdt",
108 cc->core->bus->num, &wdt,
109 sizeof(wdt));
110 if (IS_ERR(pdev))
111 return PTR_ERR(pdev);
112
113 cc->watchdog = pdev;
114
115 return 0;
116}
117
118static void bcma_core_chipcommon_flash_detect(struct bcma_drv_cc *cc)
119{
120 struct bcma_bus *bus = cc->core->bus;
121
122 switch (cc->capabilities & BCMA_CC_CAP_FLASHT) {
123 case BCMA_CC_FLASHT_STSER:
124 case BCMA_CC_FLASHT_ATSER:
125 bcma_debug(bus, "Found serial flash\n");
126 bcma_sflash_init(cc);
127 break;
128 case BCMA_CC_FLASHT_PARA:
129 bcma_debug(bus, "Found parallel flash\n");
130 bcma_pflash_init(cc);
131 break;
132 default:
133 bcma_err(bus, "Flash type not supported\n");
134 }
135
136 if (cc->core->id.rev == 38 ||
137 bus->chipinfo.id == BCMA_CHIP_ID_BCM4706) {
138 if (cc->capabilities & BCMA_CC_CAP_NFLASH) {
139 bcma_debug(bus, "Found NAND flash\n");
140 bcma_nflash_init(cc);
141 }
142 }
143}
144
145void bcma_core_chipcommon_early_init(struct bcma_drv_cc *cc)
146{
147 struct bcma_bus *bus = cc->core->bus;
148
149 if (cc->early_setup_done)
150 return;
151
152 spin_lock_init(&cc->gpio_lock);
153
154 if (cc->core->id.rev >= 11)
155 cc->status = bcma_cc_read32(cc, BCMA_CC_CHIPSTAT);
156 cc->capabilities = bcma_cc_read32(cc, BCMA_CC_CAP);
157 if (cc->core->id.rev >= 35)
158 cc->capabilities_ext = bcma_cc_read32(cc, BCMA_CC_CAP_EXT);
159
160 if (cc->capabilities & BCMA_CC_CAP_PMU)
161 bcma_pmu_early_init(cc);
162
163 if (IS_BUILTIN(CONFIG_BCM47XX) && bus->hosttype == BCMA_HOSTTYPE_SOC)
164 bcma_chipco_serial_init(cc);
165
166 if (bus->hosttype == BCMA_HOSTTYPE_SOC)
167 bcma_core_chipcommon_flash_detect(cc);
168
169 cc->early_setup_done = true;
170}
171
172void bcma_core_chipcommon_init(struct bcma_drv_cc *cc)
173{
174 u32 leddc_on = 10;
175 u32 leddc_off = 90;
176
177 if (cc->setup_done)
178 return;
179
180 bcma_core_chipcommon_early_init(cc);
181
182 if (cc->core->id.rev >= 20) {
183 u32 pullup = 0, pulldown = 0;
184
185 if (cc->core->bus->chipinfo.id == BCMA_CHIP_ID_BCM43142) {
186 pullup = 0x402e0;
187 pulldown = 0x20500;
188 }
189
190 bcma_cc_write32(cc, BCMA_CC_GPIOPULLUP, pullup);
191 bcma_cc_write32(cc, BCMA_CC_GPIOPULLDOWN, pulldown);
192 }
193
194 if (cc->capabilities & BCMA_CC_CAP_PMU)
195 bcma_pmu_init(cc);
196 if (cc->capabilities & BCMA_CC_CAP_PCTL)
197 bcma_err(cc->core->bus, "Power control not implemented!\n");
198
199 if (cc->core->id.rev >= 16) {
200 if (cc->core->bus->sprom.leddc_on_time &&
201 cc->core->bus->sprom.leddc_off_time) {
202 leddc_on = cc->core->bus->sprom.leddc_on_time;
203 leddc_off = cc->core->bus->sprom.leddc_off_time;
204 }
205 bcma_cc_write32(cc, BCMA_CC_GPIOTIMER,
206 ((leddc_on << BCMA_CC_GPIOTIMER_ONTIME_SHIFT) |
207 (leddc_off << BCMA_CC_GPIOTIMER_OFFTIME_SHIFT)));
208 }
209 cc->ticks_per_ms = bcma_chipco_watchdog_ticks_per_ms(cc);
210
211 cc->setup_done = true;
212}
213
214/* Set chip watchdog reset timer to fire in 'ticks' backplane cycles */
215u32 bcma_chipco_watchdog_timer_set(struct bcma_drv_cc *cc, u32 ticks)
216{
217 u32 maxt;
218
219 maxt = bcma_chipco_watchdog_get_max_timer(cc);
220 if (cc->capabilities & BCMA_CC_CAP_PMU) {
221 if (ticks == 1)
222 ticks = 2;
223 else if (ticks > maxt)
224 ticks = maxt;
225 bcma_pmu_write32(cc, BCMA_CC_PMU_WATCHDOG, ticks);
226 } else {
227 struct bcma_bus *bus = cc->core->bus;
228
229 if (bus->chipinfo.id != BCMA_CHIP_ID_BCM4707 &&
230 bus->chipinfo.id != BCMA_CHIP_ID_BCM47094 &&
231 bus->chipinfo.id != BCMA_CHIP_ID_BCM53018)
232 bcma_core_set_clockmode(cc->core,
233 ticks ? BCMA_CLKMODE_FAST : BCMA_CLKMODE_DYNAMIC);
234
235 if (ticks > maxt)
236 ticks = maxt;
237 /* instant NMI */
238 bcma_cc_write32(cc, BCMA_CC_WATCHDOG, ticks);
239 }
240 return ticks;
241}
242
243void bcma_chipco_irq_mask(struct bcma_drv_cc *cc, u32 mask, u32 value)
244{
245 bcma_cc_write32_masked(cc, BCMA_CC_IRQMASK, mask, value);
246}
247
248u32 bcma_chipco_irq_status(struct bcma_drv_cc *cc, u32 mask)
249{
250 return bcma_cc_read32(cc, BCMA_CC_IRQSTAT) & mask;
251}
252
253u32 bcma_chipco_gpio_in(struct bcma_drv_cc *cc, u32 mask)
254{
255 return bcma_cc_read32(cc, BCMA_CC_GPIOIN) & mask;
256}
257
258u32 bcma_chipco_gpio_out(struct bcma_drv_cc *cc, u32 mask, u32 value)
259{
260 unsigned long flags;
261 u32 res;
262
263 spin_lock_irqsave(&cc->gpio_lock, flags);
264 res = bcma_cc_write32_masked(cc, BCMA_CC_GPIOOUT, mask, value);
265 spin_unlock_irqrestore(&cc->gpio_lock, flags);
266
267 return res;
268}
269EXPORT_SYMBOL_GPL(bcma_chipco_gpio_out);
270
271u32 bcma_chipco_gpio_outen(struct bcma_drv_cc *cc, u32 mask, u32 value)
272{
273 unsigned long flags;
274 u32 res;
275
276 spin_lock_irqsave(&cc->gpio_lock, flags);
277 res = bcma_cc_write32_masked(cc, BCMA_CC_GPIOOUTEN, mask, value);
278 spin_unlock_irqrestore(&cc->gpio_lock, flags);
279
280 return res;
281}
282EXPORT_SYMBOL_GPL(bcma_chipco_gpio_outen);
283
284/*
285 * If the bit is set to 0, chipcommon controlls this GPIO,
286 * if the bit is set to 1, it is used by some part of the chip and not our code.
287 */
288u32 bcma_chipco_gpio_control(struct bcma_drv_cc *cc, u32 mask, u32 value)
289{
290 unsigned long flags;
291 u32 res;
292
293 spin_lock_irqsave(&cc->gpio_lock, flags);
294 res = bcma_cc_write32_masked(cc, BCMA_CC_GPIOCTL, mask, value);
295 spin_unlock_irqrestore(&cc->gpio_lock, flags);
296
297 return res;
298}
299EXPORT_SYMBOL_GPL(bcma_chipco_gpio_control);
300
301u32 bcma_chipco_gpio_intmask(struct bcma_drv_cc *cc, u32 mask, u32 value)
302{
303 unsigned long flags;
304 u32 res;
305
306 spin_lock_irqsave(&cc->gpio_lock, flags);
307 res = bcma_cc_write32_masked(cc, BCMA_CC_GPIOIRQ, mask, value);
308 spin_unlock_irqrestore(&cc->gpio_lock, flags);
309
310 return res;
311}
312
313u32 bcma_chipco_gpio_polarity(struct bcma_drv_cc *cc, u32 mask, u32 value)
314{
315 unsigned long flags;
316 u32 res;
317
318 spin_lock_irqsave(&cc->gpio_lock, flags);
319 res = bcma_cc_write32_masked(cc, BCMA_CC_GPIOPOL, mask, value);
320 spin_unlock_irqrestore(&cc->gpio_lock, flags);
321
322 return res;
323}
324
325u32 bcma_chipco_gpio_pullup(struct bcma_drv_cc *cc, u32 mask, u32 value)
326{
327 unsigned long flags;
328 u32 res;
329
330 if (cc->core->id.rev < 20)
331 return 0;
332
333 spin_lock_irqsave(&cc->gpio_lock, flags);
334 res = bcma_cc_write32_masked(cc, BCMA_CC_GPIOPULLUP, mask, value);
335 spin_unlock_irqrestore(&cc->gpio_lock, flags);
336
337 return res;
338}
339
340u32 bcma_chipco_gpio_pulldown(struct bcma_drv_cc *cc, u32 mask, u32 value)
341{
342 unsigned long flags;
343 u32 res;
344
345 if (cc->core->id.rev < 20)
346 return 0;
347
348 spin_lock_irqsave(&cc->gpio_lock, flags);
349 res = bcma_cc_write32_masked(cc, BCMA_CC_GPIOPULLDOWN, mask, value);
350 spin_unlock_irqrestore(&cc->gpio_lock, flags);
351
352 return res;
353}
354
355static void bcma_chipco_serial_init(struct bcma_drv_cc *cc)
356{
357#if IS_BUILTIN(CONFIG_BCM47XX)
358 unsigned int irq;
359 u32 baud_base;
360 u32 i;
361 unsigned int ccrev = cc->core->id.rev;
362 struct bcma_serial_port *ports = cc->serial_ports;
363
364 if (ccrev >= 11 && ccrev != 15) {
365 baud_base = bcma_chipco_get_alp_clock(cc);
366 if (ccrev >= 21) {
367 /* Turn off UART clock before switching clocksource. */
368 bcma_cc_write32(cc, BCMA_CC_CORECTL,
369 bcma_cc_read32(cc, BCMA_CC_CORECTL)
370 & ~BCMA_CC_CORECTL_UARTCLKEN);
371 }
372 /* Set the override bit so we don't divide it */
373 bcma_cc_write32(cc, BCMA_CC_CORECTL,
374 bcma_cc_read32(cc, BCMA_CC_CORECTL)
375 | BCMA_CC_CORECTL_UARTCLK0);
376 if (ccrev >= 21) {
377 /* Re-enable the UART clock. */
378 bcma_cc_write32(cc, BCMA_CC_CORECTL,
379 bcma_cc_read32(cc, BCMA_CC_CORECTL)
380 | BCMA_CC_CORECTL_UARTCLKEN);
381 }
382 } else {
383 bcma_err(cc->core->bus, "serial not supported on this device ccrev: 0x%x\n",
384 ccrev);
385 return;
386 }
387
388 irq = bcma_core_irq(cc->core, 0);
389
390 /* Determine the registers of the UARTs */
391 cc->nr_serial_ports = (cc->capabilities & BCMA_CC_CAP_NRUART);
392 for (i = 0; i < cc->nr_serial_ports; i++) {
393 ports[i].regs = cc->core->io_addr + BCMA_CC_UART0_DATA +
394 (i * 256);
395 ports[i].irq = irq;
396 ports[i].baud_base = baud_base;
397 ports[i].reg_shift = 0;
398 }
399#endif /* CONFIG_BCM47XX */
400}