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1// SPDX-License-Identifier: GPL-2.0-or-later
2/*
3 * arch/arm/mach-at91/pm.c
4 * AT91 Power Management
5 *
6 * Copyright (C) 2005 David Brownell
7 */
8
9#include <linux/genalloc.h>
10#include <linux/io.h>
11#include <linux/of_address.h>
12#include <linux/of.h>
13#include <linux/of_fdt.h>
14#include <linux/of_platform.h>
15#include <linux/platform_device.h>
16#include <linux/parser.h>
17#include <linux/suspend.h>
18
19#include <linux/clk.h>
20#include <linux/clk/at91_pmc.h>
21#include <linux/platform_data/atmel.h>
22
23#include <asm/cacheflush.h>
24#include <asm/fncpy.h>
25#include <asm/system_misc.h>
26#include <asm/suspend.h>
27
28#include "generic.h"
29#include "pm.h"
30#include "sam_secure.h"
31
32#define BACKUP_DDR_PHY_CALIBRATION (9)
33
34/**
35 * struct at91_pm_bu - AT91 power management backup unit data structure
36 * @suspended: true if suspended to backup mode
37 * @reserved: reserved
38 * @canary: canary data for memory checking after exit from backup mode
39 * @resume: resume API
40 * @ddr_phy_calibration: DDR PHY calibration data: ZQ0CR0, first 8 words
41 * of the memory
42 */
43struct at91_pm_bu {
44 int suspended;
45 unsigned long reserved;
46 phys_addr_t canary;
47 phys_addr_t resume;
48 unsigned long ddr_phy_calibration[BACKUP_DDR_PHY_CALIBRATION];
49};
50
51/**
52 * struct at91_pm_sfrbu_regs - registers mapping for SFRBU
53 * @pswbu: power switch BU control registers
54 */
55struct at91_pm_sfrbu_regs {
56 struct {
57 u32 key;
58 u32 ctrl;
59 u32 state;
60 u32 softsw;
61 } pswbu;
62};
63
64/**
65 * enum at91_pm_eth_clk - Ethernet clock indexes
66 * @AT91_PM_ETH_PCLK: pclk index
67 * @AT91_PM_ETH_HCLK: hclk index
68 * @AT91_PM_ETH_MAX_CLK: max index
69 */
70enum at91_pm_eth_clk {
71 AT91_PM_ETH_PCLK,
72 AT91_PM_ETH_HCLK,
73 AT91_PM_ETH_MAX_CLK,
74};
75
76/**
77 * enum at91_pm_eth - Ethernet controller indexes
78 * @AT91_PM_G_ETH: gigabit Ethernet controller index
79 * @AT91_PM_E_ETH: megabit Ethernet controller index
80 * @AT91_PM_MAX_ETH: max index
81 */
82enum at91_pm_eth {
83 AT91_PM_G_ETH,
84 AT91_PM_E_ETH,
85 AT91_PM_MAX_ETH,
86};
87
88/**
89 * struct at91_pm_quirk_eth - AT91 PM Ethernet quirks
90 * @dev: Ethernet device
91 * @np: Ethernet device node
92 * @clks: Ethernet clocks
93 * @modes: power management mode that this quirk applies to
94 * @dns_modes: do not suspend modes: stop suspending if Ethernet is configured
95 * as wakeup source but buggy and no other wakeup source is
96 * available
97 */
98struct at91_pm_quirk_eth {
99 struct device *dev;
100 struct device_node *np;
101 struct clk_bulk_data clks[AT91_PM_ETH_MAX_CLK];
102 u32 modes;
103 u32 dns_modes;
104};
105
106/**
107 * struct at91_pm_quirks - AT91 PM quirks
108 * @eth: Ethernet quirks
109 */
110struct at91_pm_quirks {
111 struct at91_pm_quirk_eth eth[AT91_PM_MAX_ETH];
112};
113
114/**
115 * struct at91_soc_pm - AT91 SoC power management data structure
116 * @config_shdwc_ws: wakeup sources configuration function for SHDWC
117 * @config_pmc_ws: wakeup srouces configuration function for PMC
118 * @ws_ids: wakup sources of_device_id array
119 * @bu: backup unit mapped data (for backup mode)
120 * @quirks: PM quirks
121 * @data: PM data to be used on last phase of suspend
122 * @sfrbu_regs: SFRBU registers mapping
123 * @memcs: memory chip select
124 */
125struct at91_soc_pm {
126 int (*config_shdwc_ws)(void __iomem *shdwc, u32 *mode, u32 *polarity);
127 int (*config_pmc_ws)(void __iomem *pmc, u32 mode, u32 polarity);
128 const struct of_device_id *ws_ids;
129 struct at91_pm_bu *bu;
130 struct at91_pm_quirks quirks;
131 struct at91_pm_data data;
132 struct at91_pm_sfrbu_regs sfrbu_regs;
133 void *memcs;
134};
135
136/**
137 * enum at91_pm_iomaps - IOs that needs to be mapped for different PM modes
138 * @AT91_PM_IOMAP_SHDWC: SHDWC controller
139 * @AT91_PM_IOMAP_SFRBU: SFRBU controller
140 * @AT91_PM_IOMAP_ETHC: Ethernet controller
141 */
142enum at91_pm_iomaps {
143 AT91_PM_IOMAP_SHDWC,
144 AT91_PM_IOMAP_SFRBU,
145 AT91_PM_IOMAP_ETHC,
146};
147
148#define AT91_PM_IOMAP(name) BIT(AT91_PM_IOMAP_##name)
149
150static struct at91_soc_pm soc_pm = {
151 .data = {
152 .standby_mode = AT91_PM_STANDBY,
153 .suspend_mode = AT91_PM_ULP0,
154 },
155};
156
157static const match_table_t pm_modes __initconst = {
158 { AT91_PM_STANDBY, "standby" },
159 { AT91_PM_ULP0, "ulp0" },
160 { AT91_PM_ULP0_FAST, "ulp0-fast" },
161 { AT91_PM_ULP1, "ulp1" },
162 { AT91_PM_BACKUP, "backup" },
163 { -1, NULL },
164};
165
166#define at91_ramc_read(id, field) \
167 __raw_readl(soc_pm.data.ramc[id] + field)
168
169#define at91_ramc_write(id, field, value) \
170 __raw_writel(value, soc_pm.data.ramc[id] + field)
171
172static int at91_pm_valid_state(suspend_state_t state)
173{
174 switch (state) {
175 case PM_SUSPEND_ON:
176 case PM_SUSPEND_STANDBY:
177 case PM_SUSPEND_MEM:
178 return 1;
179
180 default:
181 return 0;
182 }
183}
184
185static int canary = 0xA5A5A5A5;
186
187struct wakeup_source_info {
188 unsigned int pmc_fsmr_bit;
189 unsigned int shdwc_mr_bit;
190 bool set_polarity;
191};
192
193static const struct wakeup_source_info ws_info[] = {
194 { .pmc_fsmr_bit = AT91_PMC_FSTT(10), .set_polarity = true },
195 { .pmc_fsmr_bit = AT91_PMC_RTCAL, .shdwc_mr_bit = BIT(17) },
196 { .pmc_fsmr_bit = AT91_PMC_USBAL },
197 { .pmc_fsmr_bit = AT91_PMC_SDMMC_CD },
198 { .pmc_fsmr_bit = AT91_PMC_RTTAL },
199 { .pmc_fsmr_bit = AT91_PMC_RXLP_MCE },
200};
201
202static const struct of_device_id sama5d2_ws_ids[] = {
203 { .compatible = "atmel,sama5d2-gem", .data = &ws_info[0] },
204 { .compatible = "atmel,sama5d2-rtc", .data = &ws_info[1] },
205 { .compatible = "atmel,sama5d3-udc", .data = &ws_info[2] },
206 { .compatible = "atmel,at91rm9200-ohci", .data = &ws_info[2] },
207 { .compatible = "usb-ohci", .data = &ws_info[2] },
208 { .compatible = "atmel,at91sam9g45-ehci", .data = &ws_info[2] },
209 { .compatible = "usb-ehci", .data = &ws_info[2] },
210 { .compatible = "atmel,sama5d2-sdhci", .data = &ws_info[3] },
211 { /* sentinel */ }
212};
213
214static const struct of_device_id sam9x60_ws_ids[] = {
215 { .compatible = "microchip,sam9x60-rtc", .data = &ws_info[1] },
216 { .compatible = "atmel,at91rm9200-ohci", .data = &ws_info[2] },
217 { .compatible = "usb-ohci", .data = &ws_info[2] },
218 { .compatible = "atmel,at91sam9g45-ehci", .data = &ws_info[2] },
219 { .compatible = "usb-ehci", .data = &ws_info[2] },
220 { .compatible = "microchip,sam9x60-rtt", .data = &ws_info[4] },
221 { .compatible = "cdns,sam9x60-macb", .data = &ws_info[5] },
222 { /* sentinel */ }
223};
224
225static const struct of_device_id sama7g5_ws_ids[] = {
226 { .compatible = "microchip,sama7g5-rtc", .data = &ws_info[1] },
227 { .compatible = "microchip,sama7g5-ohci", .data = &ws_info[2] },
228 { .compatible = "usb-ohci", .data = &ws_info[2] },
229 { .compatible = "atmel,at91sam9g45-ehci", .data = &ws_info[2] },
230 { .compatible = "usb-ehci", .data = &ws_info[2] },
231 { .compatible = "microchip,sama7g5-sdhci", .data = &ws_info[3] },
232 { .compatible = "microchip,sama7g5-rtt", .data = &ws_info[4] },
233 { /* sentinel */ }
234};
235
236static const struct of_device_id sam9x7_ws_ids[] = {
237 { .compatible = "microchip,sam9x7-rtc", .data = &ws_info[1] },
238 { .compatible = "microchip,sam9x7-rtt", .data = &ws_info[4] },
239 { .compatible = "microchip,sam9x7-gem", .data = &ws_info[5] },
240 { /* sentinel */ }
241};
242
243static int at91_pm_config_ws(unsigned int pm_mode, bool set)
244{
245 const struct wakeup_source_info *wsi;
246 const struct of_device_id *match;
247 struct platform_device *pdev;
248 struct device_node *np;
249 unsigned int mode = 0, polarity = 0, val = 0;
250
251 if (pm_mode != AT91_PM_ULP1)
252 return 0;
253
254 if (!soc_pm.data.pmc || !soc_pm.data.shdwc || !soc_pm.ws_ids)
255 return -EPERM;
256
257 if (!set) {
258 writel(mode, soc_pm.data.pmc + AT91_PMC_FSMR);
259 return 0;
260 }
261
262 if (soc_pm.config_shdwc_ws)
263 soc_pm.config_shdwc_ws(soc_pm.data.shdwc, &mode, &polarity);
264
265 /* SHDWC.MR */
266 val = readl(soc_pm.data.shdwc + 0x04);
267
268 /* Loop through defined wakeup sources. */
269 for_each_matching_node_and_match(np, soc_pm.ws_ids, &match) {
270 pdev = of_find_device_by_node(np);
271 if (!pdev)
272 continue;
273
274 if (device_may_wakeup(&pdev->dev)) {
275 wsi = match->data;
276
277 /* Check if enabled on SHDWC. */
278 if (wsi->shdwc_mr_bit && !(val & wsi->shdwc_mr_bit))
279 goto put_device;
280
281 mode |= wsi->pmc_fsmr_bit;
282 if (wsi->set_polarity)
283 polarity |= wsi->pmc_fsmr_bit;
284 }
285
286put_device:
287 put_device(&pdev->dev);
288 }
289
290 if (mode) {
291 if (soc_pm.config_pmc_ws)
292 soc_pm.config_pmc_ws(soc_pm.data.pmc, mode, polarity);
293 } else {
294 pr_err("AT91: PM: no ULP1 wakeup sources found!");
295 }
296
297 return mode ? 0 : -EPERM;
298}
299
300static int at91_sama5d2_config_shdwc_ws(void __iomem *shdwc, u32 *mode,
301 u32 *polarity)
302{
303 u32 val;
304
305 /* SHDWC.WUIR */
306 val = readl(shdwc + 0x0c);
307 *mode |= (val & 0x3ff);
308 *polarity |= ((val >> 16) & 0x3ff);
309
310 return 0;
311}
312
313static int at91_sama5d2_config_pmc_ws(void __iomem *pmc, u32 mode, u32 polarity)
314{
315 writel(mode, pmc + AT91_PMC_FSMR);
316 writel(polarity, pmc + AT91_PMC_FSPR);
317
318 return 0;
319}
320
321static int at91_sam9x60_config_pmc_ws(void __iomem *pmc, u32 mode, u32 polarity)
322{
323 writel(mode, pmc + AT91_PMC_FSMR);
324
325 return 0;
326}
327
328static bool at91_pm_eth_quirk_is_valid(struct at91_pm_quirk_eth *eth)
329{
330 struct platform_device *pdev;
331
332 /* Interface NA in DT. */
333 if (!eth->np)
334 return false;
335
336 /* No quirks for this interface and current suspend mode. */
337 if (!(eth->modes & BIT(soc_pm.data.mode)))
338 return false;
339
340 if (!eth->dev) {
341 /* Driver not probed. */
342 pdev = of_find_device_by_node(eth->np);
343 if (!pdev)
344 return false;
345 /* put_device(eth->dev) is called at the end of suspend. */
346 eth->dev = &pdev->dev;
347 }
348
349 /* No quirks if device isn't a wakeup source. */
350 if (!device_may_wakeup(eth->dev))
351 return false;
352
353 return true;
354}
355
356static int at91_pm_config_quirks(bool suspend)
357{
358 struct at91_pm_quirk_eth *eth;
359 int i, j, ret, tmp;
360
361 /*
362 * Ethernet IPs who's device_node pointers are stored into
363 * soc_pm.quirks.eth[].np cannot handle WoL packets while in ULP0, ULP1
364 * or both due to a hardware bug. If they receive WoL packets while in
365 * ULP0 or ULP1 IPs could stop working or the whole system could stop
366 * working. We cannot handle this scenario in the ethernet driver itself
367 * as the driver is common to multiple vendors and also we only know
368 * here, in this file, if we suspend to ULP0 or ULP1 mode. Thus handle
369 * these scenarios here, as quirks.
370 */
371 for (i = 0; i < AT91_PM_MAX_ETH; i++) {
372 eth = &soc_pm.quirks.eth[i];
373
374 if (!at91_pm_eth_quirk_is_valid(eth))
375 continue;
376
377 /*
378 * For modes in dns_modes mask the system blocks if quirk is not
379 * applied but if applied the interface doesn't act at WoL
380 * events. Thus take care to avoid suspending if this interface
381 * is the only configured wakeup source.
382 */
383 if (suspend && eth->dns_modes & BIT(soc_pm.data.mode)) {
384 int ws_count = 0;
385#ifdef CONFIG_PM_SLEEP
386 struct wakeup_source *ws;
387
388 for_each_wakeup_source(ws) {
389 if (ws->dev == eth->dev)
390 continue;
391
392 ws_count++;
393 break;
394 }
395#endif
396
397 /*
398 * Checking !ws is good for all platforms with issues
399 * even when both G_ETH and E_ETH are available as dns_modes
400 * is populated only on G_ETH interface.
401 */
402 if (!ws_count) {
403 pr_err("AT91: PM: Ethernet cannot resume from WoL!");
404 ret = -EPERM;
405 put_device(eth->dev);
406 eth->dev = NULL;
407 /* No need to revert clock settings for this eth. */
408 i--;
409 goto clk_unconfigure;
410 }
411 }
412
413 if (suspend) {
414 clk_bulk_disable_unprepare(AT91_PM_ETH_MAX_CLK, eth->clks);
415 } else {
416 ret = clk_bulk_prepare_enable(AT91_PM_ETH_MAX_CLK,
417 eth->clks);
418 if (ret)
419 goto clk_unconfigure;
420 /*
421 * Release the reference to eth->dev taken in
422 * at91_pm_eth_quirk_is_valid().
423 */
424 put_device(eth->dev);
425 eth->dev = NULL;
426 }
427 }
428
429 return 0;
430
431clk_unconfigure:
432 /*
433 * In case of resume we reach this point if clk_prepare_enable() failed.
434 * we don't want to revert the previous clk_prepare_enable() for the
435 * other IP.
436 */
437 for (j = i; j >= 0; j--) {
438 eth = &soc_pm.quirks.eth[j];
439 if (suspend) {
440 if (!at91_pm_eth_quirk_is_valid(eth))
441 continue;
442
443 tmp = clk_bulk_prepare_enable(AT91_PM_ETH_MAX_CLK, eth->clks);
444 if (tmp) {
445 pr_err("AT91: PM: failed to enable %s clocks\n",
446 j == AT91_PM_G_ETH ? "geth" : "eth");
447 }
448 }
449
450 /*
451 * Release the reference to eth->dev taken in
452 * at91_pm_eth_quirk_is_valid().
453 */
454 put_device(eth->dev);
455 eth->dev = NULL;
456 }
457
458 return ret;
459}
460
461/*
462 * Called after processes are frozen, but before we shutdown devices.
463 */
464static int at91_pm_begin(suspend_state_t state)
465{
466 int ret;
467
468 switch (state) {
469 case PM_SUSPEND_MEM:
470 soc_pm.data.mode = soc_pm.data.suspend_mode;
471 break;
472
473 case PM_SUSPEND_STANDBY:
474 soc_pm.data.mode = soc_pm.data.standby_mode;
475 break;
476
477 default:
478 soc_pm.data.mode = -1;
479 }
480
481 ret = at91_pm_config_ws(soc_pm.data.mode, true);
482 if (ret)
483 return ret;
484
485 if (soc_pm.data.mode == AT91_PM_BACKUP)
486 soc_pm.bu->suspended = 1;
487 else if (soc_pm.bu)
488 soc_pm.bu->suspended = 0;
489
490 return 0;
491}
492
493/*
494 * Verify that all the clocks are correct before entering
495 * slow-clock mode.
496 */
497static int at91_pm_verify_clocks(void)
498{
499 unsigned long scsr;
500 int i;
501
502 scsr = readl(soc_pm.data.pmc + AT91_PMC_SCSR);
503
504 /* USB must not be using PLLB */
505 if ((scsr & soc_pm.data.uhp_udp_mask) != 0) {
506 pr_err("AT91: PM - Suspend-to-RAM with USB still active\n");
507 return 0;
508 }
509
510 /* PCK0..PCK3 must be disabled, or configured to use clk32k */
511 for (i = 0; i < 4; i++) {
512 u32 css;
513
514 if ((scsr & (AT91_PMC_PCK0 << i)) == 0)
515 continue;
516 css = readl(soc_pm.data.pmc + AT91_PMC_PCKR(i)) & AT91_PMC_CSS;
517 if (css != AT91_PMC_CSS_SLOW) {
518 pr_err("AT91: PM - Suspend-to-RAM with PCK%d src %d\n", i, css);
519 return 0;
520 }
521 }
522
523 return 1;
524}
525
526/*
527 * Call this from platform driver suspend() to see how deeply to suspend.
528 * For example, some controllers (like OHCI) need one of the PLL clocks
529 * in order to act as a wakeup source, and those are not available when
530 * going into slow clock mode.
531 *
532 * REVISIT: generalize as clk_will_be_available(clk)? Other platforms have
533 * the very same problem (but not using at91 main_clk), and it'd be better
534 * to add one generic API rather than lots of platform-specific ones.
535 */
536int at91_suspend_entering_slow_clock(void)
537{
538 return (soc_pm.data.mode >= AT91_PM_ULP0);
539}
540EXPORT_SYMBOL(at91_suspend_entering_slow_clock);
541
542static void (*at91_suspend_sram_fn)(struct at91_pm_data *);
543extern void at91_pm_suspend_in_sram(struct at91_pm_data *pm_data);
544extern u32 at91_pm_suspend_in_sram_sz;
545
546static int at91_suspend_finish(unsigned long val)
547{
548 unsigned char modified_gray_code[] = {
549 0x00, 0x01, 0x02, 0x03, 0x06, 0x07, 0x04, 0x05, 0x0c, 0x0d,
550 0x0e, 0x0f, 0x0a, 0x0b, 0x08, 0x09, 0x18, 0x19, 0x1a, 0x1b,
551 0x1e, 0x1f, 0x1c, 0x1d, 0x14, 0x15, 0x16, 0x17, 0x12, 0x13,
552 0x10, 0x11,
553 };
554 unsigned int tmp, index;
555 int i;
556
557 if (soc_pm.data.mode == AT91_PM_BACKUP && soc_pm.data.ramc_phy) {
558 /*
559 * Bootloader will perform DDR recalibration and will try to
560 * restore the ZQ0SR0 with the value saved here. But the
561 * calibration is buggy and restoring some values from ZQ0SR0
562 * is forbidden and risky thus we need to provide processed
563 * values for these (modified gray code values).
564 */
565 tmp = readl(soc_pm.data.ramc_phy + DDR3PHY_ZQ0SR0);
566
567 /* Store pull-down output impedance select. */
568 index = (tmp >> DDR3PHY_ZQ0SR0_PDO_OFF) & 0x1f;
569 soc_pm.bu->ddr_phy_calibration[0] = modified_gray_code[index];
570
571 /* Store pull-up output impedance select. */
572 index = (tmp >> DDR3PHY_ZQ0SR0_PUO_OFF) & 0x1f;
573 soc_pm.bu->ddr_phy_calibration[0] |= modified_gray_code[index];
574
575 /* Store pull-down on-die termination impedance select. */
576 index = (tmp >> DDR3PHY_ZQ0SR0_PDODT_OFF) & 0x1f;
577 soc_pm.bu->ddr_phy_calibration[0] |= modified_gray_code[index];
578
579 /* Store pull-up on-die termination impedance select. */
580 index = (tmp >> DDR3PHY_ZQ0SRO_PUODT_OFF) & 0x1f;
581 soc_pm.bu->ddr_phy_calibration[0] |= modified_gray_code[index];
582
583 /*
584 * The 1st 8 words of memory might get corrupted in the process
585 * of DDR PHY recalibration; it is saved here in securam and it
586 * will be restored later, after recalibration, by bootloader
587 */
588 for (i = 1; i < BACKUP_DDR_PHY_CALIBRATION; i++)
589 soc_pm.bu->ddr_phy_calibration[i] =
590 *((unsigned int *)soc_pm.memcs + (i - 1));
591 }
592
593 flush_cache_all();
594 outer_disable();
595
596 at91_suspend_sram_fn(&soc_pm.data);
597
598 return 0;
599}
600
601/**
602 * at91_pm_switch_ba_to_auto() - Configure Backup Unit Power Switch
603 * to automatic/hardware mode.
604 *
605 * The Backup Unit Power Switch can be managed either by software or hardware.
606 * Enabling hardware mode allows the automatic transition of power between
607 * VDDANA (or VDDIN33) and VDDBU (or VBAT, respectively), based on the
608 * availability of these power sources.
609 *
610 * If the Backup Unit Power Switch is already in automatic mode, no action is
611 * required. If it is in software-controlled mode, it is switched to automatic
612 * mode to enhance safety and eliminate the need for toggling between power
613 * sources.
614 */
615static void at91_pm_switch_ba_to_auto(void)
616{
617 unsigned int offset = offsetof(struct at91_pm_sfrbu_regs, pswbu);
618 unsigned int val;
619
620 /* Just for safety. */
621 if (!soc_pm.data.sfrbu)
622 return;
623
624 val = readl(soc_pm.data.sfrbu + offset);
625
626 /* Already on auto/hardware. */
627 if (!(val & soc_pm.sfrbu_regs.pswbu.ctrl))
628 return;
629
630 val &= ~soc_pm.sfrbu_regs.pswbu.ctrl;
631 val |= soc_pm.sfrbu_regs.pswbu.key;
632 writel(val, soc_pm.data.sfrbu + offset);
633}
634
635static void at91_pm_suspend(suspend_state_t state)
636{
637 if (soc_pm.data.mode == AT91_PM_BACKUP) {
638 at91_pm_switch_ba_to_auto();
639
640 cpu_suspend(0, at91_suspend_finish);
641
642 /* The SRAM is lost between suspend cycles */
643 at91_suspend_sram_fn = fncpy(at91_suspend_sram_fn,
644 &at91_pm_suspend_in_sram,
645 at91_pm_suspend_in_sram_sz);
646 } else {
647 at91_suspend_finish(0);
648 }
649
650 outer_resume();
651}
652
653/*
654 * STANDBY mode has *all* drivers suspended; ignores irqs not marked as 'wakeup'
655 * event sources; and reduces DRAM power. But otherwise it's identical to
656 * PM_SUSPEND_ON: cpu idle, and nothing fancy done with main or cpu clocks.
657 *
658 * AT91_PM_ULP0 is like STANDBY plus slow clock mode, so drivers must
659 * suspend more deeply, the master clock switches to the clk32k and turns off
660 * the main oscillator
661 *
662 * AT91_PM_BACKUP turns off the whole SoC after placing the DDR in self refresh
663 */
664static int at91_pm_enter(suspend_state_t state)
665{
666 int ret;
667
668 ret = at91_pm_config_quirks(true);
669 if (ret)
670 return ret;
671
672 switch (state) {
673 case PM_SUSPEND_MEM:
674 case PM_SUSPEND_STANDBY:
675 /*
676 * Ensure that clocks are in a valid state.
677 */
678 if (soc_pm.data.mode >= AT91_PM_ULP0 &&
679 !at91_pm_verify_clocks())
680 goto error;
681
682 at91_pm_suspend(state);
683
684 break;
685
686 case PM_SUSPEND_ON:
687 cpu_do_idle();
688 break;
689
690 default:
691 pr_debug("AT91: PM - bogus suspend state %d\n", state);
692 goto error;
693 }
694
695error:
696 at91_pm_config_quirks(false);
697 return 0;
698}
699
700/*
701 * Called right prior to thawing processes.
702 */
703static void at91_pm_end(void)
704{
705 at91_pm_config_ws(soc_pm.data.mode, false);
706}
707
708
709static const struct platform_suspend_ops at91_pm_ops = {
710 .valid = at91_pm_valid_state,
711 .begin = at91_pm_begin,
712 .enter = at91_pm_enter,
713 .end = at91_pm_end,
714};
715
716static struct platform_device at91_cpuidle_device = {
717 .name = "cpuidle-at91",
718};
719
720/*
721 * The AT91RM9200 goes into self-refresh mode with this command, and will
722 * terminate self-refresh automatically on the next SDRAM access.
723 *
724 * Self-refresh mode is exited as soon as a memory access is made, but we don't
725 * know for sure when that happens. However, we need to restore the low-power
726 * mode if it was enabled before going idle. Restoring low-power mode while
727 * still in self-refresh is "not recommended", but seems to work.
728 */
729static void at91rm9200_standby(void)
730{
731 asm volatile(
732 "b 1f\n\t"
733 ".align 5\n\t"
734 "1: mcr p15, 0, %0, c7, c10, 4\n\t"
735 " str %2, [%1, %3]\n\t"
736 " mcr p15, 0, %0, c7, c0, 4\n\t"
737 :
738 : "r" (0), "r" (soc_pm.data.ramc[0]),
739 "r" (1), "r" (AT91_MC_SDRAMC_SRR));
740}
741
742/* We manage both DDRAM/SDRAM controllers, we need more than one value to
743 * remember.
744 */
745static void at91_ddr_standby(void)
746{
747 /* Those two values allow us to delay self-refresh activation
748 * to the maximum. */
749 u32 lpr0, lpr1 = 0;
750 u32 mdr, saved_mdr0, saved_mdr1 = 0;
751 u32 saved_lpr0, saved_lpr1 = 0;
752
753 /* LPDDR1 --> force DDR2 mode during self-refresh */
754 saved_mdr0 = at91_ramc_read(0, AT91_DDRSDRC_MDR);
755 if ((saved_mdr0 & AT91_DDRSDRC_MD) == AT91_DDRSDRC_MD_LOW_POWER_DDR) {
756 mdr = saved_mdr0 & ~AT91_DDRSDRC_MD;
757 mdr |= AT91_DDRSDRC_MD_DDR2;
758 at91_ramc_write(0, AT91_DDRSDRC_MDR, mdr);
759 }
760
761 if (soc_pm.data.ramc[1]) {
762 saved_lpr1 = at91_ramc_read(1, AT91_DDRSDRC_LPR);
763 lpr1 = saved_lpr1 & ~AT91_DDRSDRC_LPCB;
764 lpr1 |= AT91_DDRSDRC_LPCB_SELF_REFRESH;
765 saved_mdr1 = at91_ramc_read(1, AT91_DDRSDRC_MDR);
766 if ((saved_mdr1 & AT91_DDRSDRC_MD) == AT91_DDRSDRC_MD_LOW_POWER_DDR) {
767 mdr = saved_mdr1 & ~AT91_DDRSDRC_MD;
768 mdr |= AT91_DDRSDRC_MD_DDR2;
769 at91_ramc_write(1, AT91_DDRSDRC_MDR, mdr);
770 }
771 }
772
773 saved_lpr0 = at91_ramc_read(0, AT91_DDRSDRC_LPR);
774 lpr0 = saved_lpr0 & ~AT91_DDRSDRC_LPCB;
775 lpr0 |= AT91_DDRSDRC_LPCB_SELF_REFRESH;
776
777 /* self-refresh mode now */
778 at91_ramc_write(0, AT91_DDRSDRC_LPR, lpr0);
779 if (soc_pm.data.ramc[1])
780 at91_ramc_write(1, AT91_DDRSDRC_LPR, lpr1);
781
782 cpu_do_idle();
783
784 at91_ramc_write(0, AT91_DDRSDRC_MDR, saved_mdr0);
785 at91_ramc_write(0, AT91_DDRSDRC_LPR, saved_lpr0);
786 if (soc_pm.data.ramc[1]) {
787 at91_ramc_write(0, AT91_DDRSDRC_MDR, saved_mdr1);
788 at91_ramc_write(1, AT91_DDRSDRC_LPR, saved_lpr1);
789 }
790}
791
792static void sama5d3_ddr_standby(void)
793{
794 u32 lpr0;
795 u32 saved_lpr0;
796
797 saved_lpr0 = at91_ramc_read(0, AT91_DDRSDRC_LPR);
798 lpr0 = saved_lpr0 & ~AT91_DDRSDRC_LPCB;
799 lpr0 |= AT91_DDRSDRC_LPCB_POWER_DOWN;
800
801 at91_ramc_write(0, AT91_DDRSDRC_LPR, lpr0);
802
803 cpu_do_idle();
804
805 at91_ramc_write(0, AT91_DDRSDRC_LPR, saved_lpr0);
806}
807
808/* We manage both DDRAM/SDRAM controllers, we need more than one value to
809 * remember.
810 */
811static void at91sam9_sdram_standby(void)
812{
813 u32 lpr0, lpr1 = 0;
814 u32 saved_lpr0, saved_lpr1 = 0;
815
816 if (soc_pm.data.ramc[1]) {
817 saved_lpr1 = at91_ramc_read(1, AT91_SDRAMC_LPR);
818 lpr1 = saved_lpr1 & ~AT91_SDRAMC_LPCB;
819 lpr1 |= AT91_SDRAMC_LPCB_SELF_REFRESH;
820 }
821
822 saved_lpr0 = at91_ramc_read(0, AT91_SDRAMC_LPR);
823 lpr0 = saved_lpr0 & ~AT91_SDRAMC_LPCB;
824 lpr0 |= AT91_SDRAMC_LPCB_SELF_REFRESH;
825
826 /* self-refresh mode now */
827 at91_ramc_write(0, AT91_SDRAMC_LPR, lpr0);
828 if (soc_pm.data.ramc[1])
829 at91_ramc_write(1, AT91_SDRAMC_LPR, lpr1);
830
831 cpu_do_idle();
832
833 at91_ramc_write(0, AT91_SDRAMC_LPR, saved_lpr0);
834 if (soc_pm.data.ramc[1])
835 at91_ramc_write(1, AT91_SDRAMC_LPR, saved_lpr1);
836}
837
838static void sama7g5_standby(void)
839{
840 int pwrtmg, ratio;
841
842 pwrtmg = readl(soc_pm.data.ramc[0] + UDDRC_PWRCTL);
843 ratio = readl(soc_pm.data.pmc + AT91_PMC_RATIO);
844
845 /*
846 * Place RAM into self-refresh after a maximum idle clocks. The maximum
847 * idle clocks is configured by bootloader in
848 * UDDRC_PWRMGT.SELFREF_TO_X32.
849 */
850 writel(pwrtmg | UDDRC_PWRCTL_SELFREF_EN,
851 soc_pm.data.ramc[0] + UDDRC_PWRCTL);
852 /* Divide CPU clock by 16. */
853 writel(ratio & ~AT91_PMC_RATIO_RATIO, soc_pm.data.pmc + AT91_PMC_RATIO);
854
855 cpu_do_idle();
856
857 /* Restore previous configuration. */
858 writel(ratio, soc_pm.data.pmc + AT91_PMC_RATIO);
859 writel(pwrtmg, soc_pm.data.ramc[0] + UDDRC_PWRCTL);
860}
861
862struct ramc_info {
863 void (*idle)(void);
864 unsigned int memctrl;
865};
866
867static const struct ramc_info ramc_infos[] __initconst = {
868 { .idle = at91rm9200_standby, .memctrl = AT91_MEMCTRL_MC},
869 { .idle = at91sam9_sdram_standby, .memctrl = AT91_MEMCTRL_SDRAMC},
870 { .idle = at91_ddr_standby, .memctrl = AT91_MEMCTRL_DDRSDR},
871 { .idle = sama5d3_ddr_standby, .memctrl = AT91_MEMCTRL_DDRSDR},
872 { .idle = sama7g5_standby, },
873};
874
875static const struct of_device_id ramc_ids[] __initconst = {
876 { .compatible = "atmel,at91rm9200-sdramc", .data = &ramc_infos[0] },
877 { .compatible = "atmel,at91sam9260-sdramc", .data = &ramc_infos[1] },
878 { .compatible = "atmel,at91sam9g45-ddramc", .data = &ramc_infos[2] },
879 { .compatible = "atmel,sama5d3-ddramc", .data = &ramc_infos[3] },
880 { .compatible = "microchip,sama7g5-uddrc", .data = &ramc_infos[4], },
881 { /*sentinel*/ }
882};
883
884static const struct of_device_id ramc_phy_ids[] __initconst = {
885 { .compatible = "microchip,sama7g5-ddr3phy", },
886 { /* Sentinel. */ },
887};
888
889static __init int at91_dt_ramc(bool phy_mandatory)
890{
891 struct device_node *np;
892 const struct of_device_id *of_id;
893 int idx = 0;
894 void *standby = NULL;
895 const struct ramc_info *ramc;
896 int ret;
897
898 for_each_matching_node_and_match(np, ramc_ids, &of_id) {
899 soc_pm.data.ramc[idx] = of_iomap(np, 0);
900 if (!soc_pm.data.ramc[idx]) {
901 pr_err("unable to map ramc[%d] cpu registers\n", idx);
902 ret = -ENOMEM;
903 of_node_put(np);
904 goto unmap_ramc;
905 }
906
907 ramc = of_id->data;
908 if (ramc) {
909 if (!standby)
910 standby = ramc->idle;
911 soc_pm.data.memctrl = ramc->memctrl;
912 }
913
914 idx++;
915 }
916
917 if (!idx) {
918 pr_err("unable to find compatible ram controller node in dtb\n");
919 ret = -ENODEV;
920 goto unmap_ramc;
921 }
922
923 /* Lookup for DDR PHY node, if any. */
924 for_each_matching_node_and_match(np, ramc_phy_ids, &of_id) {
925 soc_pm.data.ramc_phy = of_iomap(np, 0);
926 if (!soc_pm.data.ramc_phy) {
927 pr_err("unable to map ramc phy cpu registers\n");
928 ret = -ENOMEM;
929 of_node_put(np);
930 goto unmap_ramc;
931 }
932 }
933
934 if (phy_mandatory && !soc_pm.data.ramc_phy) {
935 pr_err("DDR PHY is mandatory!\n");
936 ret = -ENODEV;
937 goto unmap_ramc;
938 }
939
940 if (!standby) {
941 pr_warn("ramc no standby function available\n");
942 return 0;
943 }
944
945 at91_cpuidle_device.dev.platform_data = standby;
946
947 return 0;
948
949unmap_ramc:
950 while (idx)
951 iounmap(soc_pm.data.ramc[--idx]);
952
953 return ret;
954}
955
956static void at91rm9200_idle(void)
957{
958 /*
959 * Disable the processor clock. The processor will be automatically
960 * re-enabled by an interrupt or by a reset.
961 */
962 writel(AT91_PMC_PCK, soc_pm.data.pmc + AT91_PMC_SCDR);
963}
964
965static void at91sam9_idle(void)
966{
967 writel(AT91_PMC_PCK, soc_pm.data.pmc + AT91_PMC_SCDR);
968 cpu_do_idle();
969}
970
971static void __init at91_pm_sram_init(void)
972{
973 struct gen_pool *sram_pool;
974 phys_addr_t sram_pbase;
975 unsigned long sram_base;
976 struct device_node *node;
977 struct platform_device *pdev = NULL;
978
979 for_each_compatible_node(node, NULL, "mmio-sram") {
980 pdev = of_find_device_by_node(node);
981 if (pdev) {
982 of_node_put(node);
983 break;
984 }
985 }
986
987 if (!pdev) {
988 pr_warn("%s: failed to find sram device!\n", __func__);
989 return;
990 }
991
992 sram_pool = gen_pool_get(&pdev->dev, NULL);
993 if (!sram_pool) {
994 pr_warn("%s: sram pool unavailable!\n", __func__);
995 goto out_put_device;
996 }
997
998 sram_base = gen_pool_alloc(sram_pool, at91_pm_suspend_in_sram_sz);
999 if (!sram_base) {
1000 pr_warn("%s: unable to alloc sram!\n", __func__);
1001 goto out_put_device;
1002 }
1003
1004 sram_pbase = gen_pool_virt_to_phys(sram_pool, sram_base);
1005 at91_suspend_sram_fn = __arm_ioremap_exec(sram_pbase,
1006 at91_pm_suspend_in_sram_sz, false);
1007 if (!at91_suspend_sram_fn) {
1008 pr_warn("SRAM: Could not map\n");
1009 goto out_put_device;
1010 }
1011
1012 /* Copy the pm suspend handler to SRAM */
1013 at91_suspend_sram_fn = fncpy(at91_suspend_sram_fn,
1014 &at91_pm_suspend_in_sram, at91_pm_suspend_in_sram_sz);
1015 return;
1016
1017out_put_device:
1018 put_device(&pdev->dev);
1019 return;
1020}
1021
1022static bool __init at91_is_pm_mode_active(int pm_mode)
1023{
1024 return (soc_pm.data.standby_mode == pm_mode ||
1025 soc_pm.data.suspend_mode == pm_mode);
1026}
1027
1028static int __init at91_pm_backup_scan_memcs(unsigned long node,
1029 const char *uname, int depth,
1030 void *data)
1031{
1032 const char *type;
1033 const __be32 *reg;
1034 int *located = data;
1035 int size;
1036
1037 /* Memory node already located. */
1038 if (*located)
1039 return 0;
1040
1041 type = of_get_flat_dt_prop(node, "device_type", NULL);
1042
1043 /* We are scanning "memory" nodes only. */
1044 if (!type || strcmp(type, "memory"))
1045 return 0;
1046
1047 reg = of_get_flat_dt_prop(node, "reg", &size);
1048 if (reg) {
1049 soc_pm.memcs = __va((phys_addr_t)be32_to_cpu(*reg));
1050 *located = 1;
1051 }
1052
1053 return 0;
1054}
1055
1056static int __init at91_pm_backup_init(void)
1057{
1058 struct gen_pool *sram_pool;
1059 struct device_node *np;
1060 struct platform_device *pdev;
1061 int ret = -ENODEV, located = 0;
1062
1063 if (!IS_ENABLED(CONFIG_SOC_SAMA5D2) &&
1064 !IS_ENABLED(CONFIG_SOC_SAMA7G5))
1065 return -EPERM;
1066
1067 if (!at91_is_pm_mode_active(AT91_PM_BACKUP))
1068 return 0;
1069
1070 np = of_find_compatible_node(NULL, NULL, "atmel,sama5d2-securam");
1071 if (!np)
1072 return ret;
1073
1074 pdev = of_find_device_by_node(np);
1075 of_node_put(np);
1076 if (!pdev) {
1077 pr_warn("%s: failed to find securam device!\n", __func__);
1078 return ret;
1079 }
1080
1081 sram_pool = gen_pool_get(&pdev->dev, NULL);
1082 if (!sram_pool) {
1083 pr_warn("%s: securam pool unavailable!\n", __func__);
1084 goto securam_fail;
1085 }
1086
1087 soc_pm.bu = (void *)gen_pool_alloc(sram_pool, sizeof(struct at91_pm_bu));
1088 if (!soc_pm.bu) {
1089 pr_warn("%s: unable to alloc securam!\n", __func__);
1090 ret = -ENOMEM;
1091 goto securam_fail;
1092 }
1093
1094 soc_pm.bu->suspended = 0;
1095 soc_pm.bu->canary = __pa_symbol(&canary);
1096 soc_pm.bu->resume = __pa_symbol(cpu_resume);
1097 if (soc_pm.data.ramc_phy) {
1098 of_scan_flat_dt(at91_pm_backup_scan_memcs, &located);
1099 if (!located)
1100 goto securam_fail;
1101 }
1102
1103 return 0;
1104
1105securam_fail:
1106 put_device(&pdev->dev);
1107 return ret;
1108}
1109
1110static void __init at91_pm_secure_init(void)
1111{
1112 int suspend_mode;
1113 struct arm_smccc_res res;
1114
1115 suspend_mode = soc_pm.data.suspend_mode;
1116
1117 res = sam_smccc_call(SAMA5_SMC_SIP_SET_SUSPEND_MODE,
1118 suspend_mode, 0);
1119 if (res.a0 == 0) {
1120 pr_info("AT91: Secure PM: suspend mode set to %s\n",
1121 pm_modes[suspend_mode].pattern);
1122 soc_pm.data.mode = suspend_mode;
1123 return;
1124 }
1125
1126 pr_warn("AT91: Secure PM: %s mode not supported !\n",
1127 pm_modes[suspend_mode].pattern);
1128
1129 res = sam_smccc_call(SAMA5_SMC_SIP_GET_SUSPEND_MODE, 0, 0);
1130 if (res.a0 == 0) {
1131 pr_warn("AT91: Secure PM: failed to get default mode\n");
1132 soc_pm.data.mode = -1;
1133 return;
1134 }
1135
1136 pr_info("AT91: Secure PM: using default suspend mode %s\n",
1137 pm_modes[suspend_mode].pattern);
1138
1139 soc_pm.data.suspend_mode = res.a1;
1140 soc_pm.data.mode = soc_pm.data.suspend_mode;
1141}
1142static const struct of_device_id atmel_shdwc_ids[] = {
1143 { .compatible = "atmel,sama5d2-shdwc" },
1144 { .compatible = "microchip,sam9x60-shdwc" },
1145 { .compatible = "microchip,sama7g5-shdwc" },
1146 { /* sentinel. */ }
1147};
1148
1149static const struct of_device_id gmac_ids[] __initconst = {
1150 { .compatible = "atmel,sama5d3-gem" },
1151 { .compatible = "atmel,sama5d2-gem" },
1152 { .compatible = "atmel,sama5d29-gem" },
1153 { .compatible = "microchip,sama7g5-gem" },
1154 { },
1155};
1156
1157static const struct of_device_id emac_ids[] __initconst = {
1158 { .compatible = "atmel,sama5d3-macb" },
1159 { .compatible = "microchip,sama7g5-emac" },
1160 { },
1161};
1162
1163/*
1164 * Replaces _mode_to_replace with a supported mode that doesn't depend
1165 * on controller pointed by _map_bitmask
1166 * @_maps: u32 array containing AT91_PM_IOMAP() flags and indexed by AT91
1167 * PM mode
1168 * @_map_bitmask: AT91_PM_IOMAP() bitmask; if _mode_to_replace depends on
1169 * controller represented by _map_bitmask, _mode_to_replace needs to be
1170 * updated
1171 * @_mode_to_replace: standby_mode or suspend_mode that need to be
1172 * updated
1173 * @_mode_to_check: standby_mode or suspend_mode; this is needed here
1174 * to avoid having standby_mode and suspend_mode set with the same AT91
1175 * PM mode
1176 */
1177#define AT91_PM_REPLACE_MODE(_maps, _map_bitmask, _mode_to_replace, \
1178 _mode_to_check) \
1179 do { \
1180 if (((_maps)[(_mode_to_replace)]) & (_map_bitmask)) { \
1181 int _mode_to_use, _mode_complementary; \
1182 /* Use ULP0 if it doesn't need _map_bitmask. */ \
1183 if (!((_maps)[AT91_PM_ULP0] & (_map_bitmask))) {\
1184 _mode_to_use = AT91_PM_ULP0; \
1185 _mode_complementary = AT91_PM_STANDBY; \
1186 } else { \
1187 _mode_to_use = AT91_PM_STANDBY; \
1188 _mode_complementary = AT91_PM_STANDBY; \
1189 } \
1190 \
1191 if ((_mode_to_check) != _mode_to_use) \
1192 (_mode_to_replace) = _mode_to_use; \
1193 else \
1194 (_mode_to_replace) = _mode_complementary;\
1195 } \
1196 } while (0)
1197
1198/*
1199 * Replaces standby and suspend modes with default supported modes:
1200 * ULP0 and STANDBY.
1201 * @_maps: u32 array indexed by AT91 PM mode containing AT91_PM_IOMAP()
1202 * flags
1203 * @_map: controller specific name; standby and suspend mode need to be
1204 * replaced in order to not depend on this controller
1205 */
1206#define AT91_PM_REPLACE_MODES(_maps, _map) \
1207 do { \
1208 AT91_PM_REPLACE_MODE((_maps), BIT(AT91_PM_IOMAP_##_map),\
1209 (soc_pm.data.standby_mode), \
1210 (soc_pm.data.suspend_mode)); \
1211 AT91_PM_REPLACE_MODE((_maps), BIT(AT91_PM_IOMAP_##_map),\
1212 (soc_pm.data.suspend_mode), \
1213 (soc_pm.data.standby_mode)); \
1214 } while (0)
1215
1216static int __init at91_pm_get_eth_clks(struct device_node *np,
1217 struct clk_bulk_data *clks)
1218{
1219 clks[AT91_PM_ETH_PCLK].clk = of_clk_get_by_name(np, "pclk");
1220 if (IS_ERR(clks[AT91_PM_ETH_PCLK].clk))
1221 return PTR_ERR(clks[AT91_PM_ETH_PCLK].clk);
1222
1223 clks[AT91_PM_ETH_HCLK].clk = of_clk_get_by_name(np, "hclk");
1224 if (IS_ERR(clks[AT91_PM_ETH_HCLK].clk))
1225 return PTR_ERR(clks[AT91_PM_ETH_HCLK].clk);
1226
1227 return 0;
1228}
1229
1230static int __init at91_pm_eth_clks_empty(struct clk_bulk_data *clks)
1231{
1232 return IS_ERR(clks[AT91_PM_ETH_PCLK].clk) ||
1233 IS_ERR(clks[AT91_PM_ETH_HCLK].clk);
1234}
1235
1236static void __init at91_pm_modes_init(const u32 *maps, int len)
1237{
1238 struct at91_pm_quirk_eth *gmac = &soc_pm.quirks.eth[AT91_PM_G_ETH];
1239 struct at91_pm_quirk_eth *emac = &soc_pm.quirks.eth[AT91_PM_E_ETH];
1240 struct device_node *np;
1241 int ret;
1242
1243 ret = at91_pm_backup_init();
1244 if (ret) {
1245 if (soc_pm.data.standby_mode == AT91_PM_BACKUP)
1246 soc_pm.data.standby_mode = AT91_PM_ULP0;
1247 if (soc_pm.data.suspend_mode == AT91_PM_BACKUP)
1248 soc_pm.data.suspend_mode = AT91_PM_ULP0;
1249 }
1250
1251 if (maps[soc_pm.data.standby_mode] & AT91_PM_IOMAP(SHDWC) ||
1252 maps[soc_pm.data.suspend_mode] & AT91_PM_IOMAP(SHDWC)) {
1253 np = of_find_matching_node(NULL, atmel_shdwc_ids);
1254 if (!np) {
1255 pr_warn("%s: failed to find shdwc!\n", __func__);
1256 AT91_PM_REPLACE_MODES(maps, SHDWC);
1257 } else {
1258 soc_pm.data.shdwc = of_iomap(np, 0);
1259 of_node_put(np);
1260 }
1261 }
1262
1263 if (maps[soc_pm.data.standby_mode] & AT91_PM_IOMAP(SFRBU) ||
1264 maps[soc_pm.data.suspend_mode] & AT91_PM_IOMAP(SFRBU)) {
1265 np = of_find_compatible_node(NULL, NULL, "atmel,sama5d2-sfrbu");
1266 if (!np) {
1267 pr_warn("%s: failed to find sfrbu!\n", __func__);
1268 AT91_PM_REPLACE_MODES(maps, SFRBU);
1269 } else {
1270 soc_pm.data.sfrbu = of_iomap(np, 0);
1271 of_node_put(np);
1272 }
1273 }
1274
1275 if ((at91_is_pm_mode_active(AT91_PM_ULP1) ||
1276 at91_is_pm_mode_active(AT91_PM_ULP0) ||
1277 at91_is_pm_mode_active(AT91_PM_ULP0_FAST)) &&
1278 (maps[soc_pm.data.standby_mode] & AT91_PM_IOMAP(ETHC) ||
1279 maps[soc_pm.data.suspend_mode] & AT91_PM_IOMAP(ETHC))) {
1280 np = of_find_matching_node(NULL, gmac_ids);
1281 if (!np) {
1282 np = of_find_matching_node(NULL, emac_ids);
1283 if (np)
1284 goto get_emac_clks;
1285 AT91_PM_REPLACE_MODES(maps, ETHC);
1286 goto unmap_unused_nodes;
1287 } else {
1288 gmac->np = np;
1289 at91_pm_get_eth_clks(np, gmac->clks);
1290 }
1291
1292 np = of_find_matching_node(NULL, emac_ids);
1293 if (!np) {
1294 if (at91_pm_eth_clks_empty(gmac->clks))
1295 AT91_PM_REPLACE_MODES(maps, ETHC);
1296 } else {
1297get_emac_clks:
1298 emac->np = np;
1299 ret = at91_pm_get_eth_clks(np, emac->clks);
1300 if (ret && at91_pm_eth_clks_empty(gmac->clks)) {
1301 of_node_put(gmac->np);
1302 of_node_put(emac->np);
1303 gmac->np = NULL;
1304 emac->np = NULL;
1305 }
1306 }
1307 }
1308
1309unmap_unused_nodes:
1310 /* Unmap all unnecessary. */
1311 if (soc_pm.data.shdwc &&
1312 !(maps[soc_pm.data.standby_mode] & AT91_PM_IOMAP(SHDWC) ||
1313 maps[soc_pm.data.suspend_mode] & AT91_PM_IOMAP(SHDWC))) {
1314 iounmap(soc_pm.data.shdwc);
1315 soc_pm.data.shdwc = NULL;
1316 }
1317
1318 if (soc_pm.data.sfrbu &&
1319 !(maps[soc_pm.data.standby_mode] & AT91_PM_IOMAP(SFRBU) ||
1320 maps[soc_pm.data.suspend_mode] & AT91_PM_IOMAP(SFRBU))) {
1321 iounmap(soc_pm.data.sfrbu);
1322 soc_pm.data.sfrbu = NULL;
1323 }
1324
1325 return;
1326}
1327
1328struct pmc_info {
1329 unsigned long uhp_udp_mask;
1330 unsigned long mckr;
1331 unsigned long version;
1332};
1333
1334static const struct pmc_info pmc_infos[] __initconst = {
1335 {
1336 .uhp_udp_mask = AT91RM9200_PMC_UHP | AT91RM9200_PMC_UDP,
1337 .mckr = 0x30,
1338 .version = AT91_PMC_V1,
1339 },
1340
1341 {
1342 .uhp_udp_mask = AT91SAM926x_PMC_UHP | AT91SAM926x_PMC_UDP,
1343 .mckr = 0x30,
1344 .version = AT91_PMC_V1,
1345 },
1346 {
1347 .uhp_udp_mask = AT91SAM926x_PMC_UHP,
1348 .mckr = 0x30,
1349 .version = AT91_PMC_V1,
1350 },
1351 { .uhp_udp_mask = 0,
1352 .mckr = 0x30,
1353 .version = AT91_PMC_V1,
1354 },
1355 {
1356 .uhp_udp_mask = AT91SAM926x_PMC_UHP | AT91SAM926x_PMC_UDP,
1357 .mckr = 0x28,
1358 .version = AT91_PMC_V2,
1359 },
1360 {
1361 .mckr = 0x28,
1362 .version = AT91_PMC_V2,
1363 },
1364
1365};
1366
1367static const struct of_device_id atmel_pmc_ids[] __initconst = {
1368 { .compatible = "atmel,at91rm9200-pmc", .data = &pmc_infos[0] },
1369 { .compatible = "atmel,at91sam9260-pmc", .data = &pmc_infos[1] },
1370 { .compatible = "atmel,at91sam9261-pmc", .data = &pmc_infos[1] },
1371 { .compatible = "atmel,at91sam9263-pmc", .data = &pmc_infos[1] },
1372 { .compatible = "atmel,at91sam9g45-pmc", .data = &pmc_infos[2] },
1373 { .compatible = "atmel,at91sam9n12-pmc", .data = &pmc_infos[1] },
1374 { .compatible = "atmel,at91sam9rl-pmc", .data = &pmc_infos[3] },
1375 { .compatible = "atmel,at91sam9x5-pmc", .data = &pmc_infos[1] },
1376 { .compatible = "atmel,sama5d3-pmc", .data = &pmc_infos[1] },
1377 { .compatible = "atmel,sama5d4-pmc", .data = &pmc_infos[1] },
1378 { .compatible = "atmel,sama5d2-pmc", .data = &pmc_infos[1] },
1379 { .compatible = "microchip,sam9x60-pmc", .data = &pmc_infos[4] },
1380 { .compatible = "microchip,sam9x7-pmc", .data = &pmc_infos[4] },
1381 { .compatible = "microchip,sama7g5-pmc", .data = &pmc_infos[5] },
1382 { /* sentinel */ },
1383};
1384
1385static void __init at91_pm_modes_validate(const int *modes, int len)
1386{
1387 u8 i, standby = 0, suspend = 0;
1388 int mode;
1389
1390 for (i = 0; i < len; i++) {
1391 if (standby && suspend)
1392 break;
1393
1394 if (modes[i] == soc_pm.data.standby_mode && !standby) {
1395 standby = 1;
1396 continue;
1397 }
1398
1399 if (modes[i] == soc_pm.data.suspend_mode && !suspend) {
1400 suspend = 1;
1401 continue;
1402 }
1403 }
1404
1405 if (!standby) {
1406 if (soc_pm.data.suspend_mode == AT91_PM_STANDBY)
1407 mode = AT91_PM_ULP0;
1408 else
1409 mode = AT91_PM_STANDBY;
1410
1411 pr_warn("AT91: PM: %s mode not supported! Using %s.\n",
1412 pm_modes[soc_pm.data.standby_mode].pattern,
1413 pm_modes[mode].pattern);
1414 soc_pm.data.standby_mode = mode;
1415 }
1416
1417 if (!suspend) {
1418 if (soc_pm.data.standby_mode == AT91_PM_ULP0)
1419 mode = AT91_PM_STANDBY;
1420 else
1421 mode = AT91_PM_ULP0;
1422
1423 pr_warn("AT91: PM: %s mode not supported! Using %s.\n",
1424 pm_modes[soc_pm.data.suspend_mode].pattern,
1425 pm_modes[mode].pattern);
1426 soc_pm.data.suspend_mode = mode;
1427 }
1428}
1429
1430static void __init at91_pm_init(void (*pm_idle)(void))
1431{
1432 struct device_node *pmc_np;
1433 const struct of_device_id *of_id;
1434 const struct pmc_info *pmc;
1435
1436 if (at91_cpuidle_device.dev.platform_data)
1437 platform_device_register(&at91_cpuidle_device);
1438
1439 pmc_np = of_find_matching_node_and_match(NULL, atmel_pmc_ids, &of_id);
1440 soc_pm.data.pmc = of_iomap(pmc_np, 0);
1441 of_node_put(pmc_np);
1442 if (!soc_pm.data.pmc) {
1443 pr_err("AT91: PM not supported, PMC not found\n");
1444 return;
1445 }
1446
1447 pmc = of_id->data;
1448 soc_pm.data.uhp_udp_mask = pmc->uhp_udp_mask;
1449 soc_pm.data.pmc_mckr_offset = pmc->mckr;
1450 soc_pm.data.pmc_version = pmc->version;
1451
1452 if (pm_idle)
1453 arm_pm_idle = pm_idle;
1454
1455 at91_pm_sram_init();
1456
1457 if (at91_suspend_sram_fn) {
1458 suspend_set_ops(&at91_pm_ops);
1459 pr_info("AT91: PM: standby: %s, suspend: %s\n",
1460 pm_modes[soc_pm.data.standby_mode].pattern,
1461 pm_modes[soc_pm.data.suspend_mode].pattern);
1462 } else {
1463 pr_info("AT91: PM not supported, due to no SRAM allocated\n");
1464 }
1465}
1466
1467void __init at91rm9200_pm_init(void)
1468{
1469 int ret;
1470
1471 if (!IS_ENABLED(CONFIG_SOC_AT91RM9200))
1472 return;
1473
1474 /*
1475 * Force STANDBY and ULP0 mode to avoid calling
1476 * at91_pm_modes_validate() which may increase booting time.
1477 * Platform supports anyway only STANDBY and ULP0 modes.
1478 */
1479 soc_pm.data.standby_mode = AT91_PM_STANDBY;
1480 soc_pm.data.suspend_mode = AT91_PM_ULP0;
1481
1482 ret = at91_dt_ramc(false);
1483 if (ret)
1484 return;
1485
1486 /*
1487 * AT91RM9200 SDRAM low-power mode cannot be used with self-refresh.
1488 */
1489 at91_ramc_write(0, AT91_MC_SDRAMC_LPR, 0);
1490
1491 at91_pm_init(at91rm9200_idle);
1492}
1493
1494void __init sam9x60_pm_init(void)
1495{
1496 static const int modes[] __initconst = {
1497 AT91_PM_STANDBY, AT91_PM_ULP0, AT91_PM_ULP0_FAST, AT91_PM_ULP1,
1498 };
1499 static const int iomaps[] __initconst = {
1500 [AT91_PM_ULP1] = AT91_PM_IOMAP(SHDWC),
1501 };
1502 int ret;
1503
1504 if (!IS_ENABLED(CONFIG_SOC_SAM9X60))
1505 return;
1506
1507 at91_pm_modes_validate(modes, ARRAY_SIZE(modes));
1508 at91_pm_modes_init(iomaps, ARRAY_SIZE(iomaps));
1509 ret = at91_dt_ramc(false);
1510 if (ret)
1511 return;
1512
1513 at91_pm_init(NULL);
1514
1515 soc_pm.ws_ids = sam9x60_ws_ids;
1516 soc_pm.config_pmc_ws = at91_sam9x60_config_pmc_ws;
1517}
1518
1519void __init sam9x7_pm_init(void)
1520{
1521 static const int modes[] __initconst = {
1522 AT91_PM_STANDBY, AT91_PM_ULP0,
1523 };
1524 int ret;
1525
1526 if (!IS_ENABLED(CONFIG_SOC_SAM9X7))
1527 return;
1528
1529 at91_pm_modes_validate(modes, ARRAY_SIZE(modes));
1530 ret = at91_dt_ramc(false);
1531 if (ret)
1532 return;
1533
1534 at91_pm_init(NULL);
1535
1536 soc_pm.ws_ids = sam9x7_ws_ids;
1537 soc_pm.config_pmc_ws = at91_sam9x60_config_pmc_ws;
1538}
1539
1540void __init at91sam9_pm_init(void)
1541{
1542 int ret;
1543
1544 if (!IS_ENABLED(CONFIG_SOC_AT91SAM9))
1545 return;
1546
1547 /*
1548 * Force STANDBY and ULP0 mode to avoid calling
1549 * at91_pm_modes_validate() which may increase booting time.
1550 * Platform supports anyway only STANDBY and ULP0 modes.
1551 */
1552 soc_pm.data.standby_mode = AT91_PM_STANDBY;
1553 soc_pm.data.suspend_mode = AT91_PM_ULP0;
1554
1555 ret = at91_dt_ramc(false);
1556 if (ret)
1557 return;
1558
1559 at91_pm_init(at91sam9_idle);
1560}
1561
1562void __init sama5_pm_init(void)
1563{
1564 static const int modes[] __initconst = {
1565 AT91_PM_STANDBY, AT91_PM_ULP0, AT91_PM_ULP0_FAST,
1566 };
1567 static const u32 iomaps[] __initconst = {
1568 [AT91_PM_ULP0] = AT91_PM_IOMAP(ETHC),
1569 [AT91_PM_ULP0_FAST] = AT91_PM_IOMAP(ETHC),
1570 };
1571 int ret;
1572
1573 if (!IS_ENABLED(CONFIG_SOC_SAMA5))
1574 return;
1575
1576 at91_pm_modes_validate(modes, ARRAY_SIZE(modes));
1577 at91_pm_modes_init(iomaps, ARRAY_SIZE(iomaps));
1578 ret = at91_dt_ramc(false);
1579 if (ret)
1580 return;
1581
1582 at91_pm_init(NULL);
1583
1584 /* Quirks applies to ULP0, ULP0 fast and ULP1 modes. */
1585 soc_pm.quirks.eth[AT91_PM_G_ETH].modes = BIT(AT91_PM_ULP0) |
1586 BIT(AT91_PM_ULP0_FAST) |
1587 BIT(AT91_PM_ULP1);
1588 /* Do not suspend in ULP0, ULP0 fast if GETH is the only wakeup source. */
1589 soc_pm.quirks.eth[AT91_PM_G_ETH].dns_modes = BIT(AT91_PM_ULP0) |
1590 BIT(AT91_PM_ULP0_FAST);
1591}
1592
1593void __init sama5d2_pm_init(void)
1594{
1595 static const int modes[] __initconst = {
1596 AT91_PM_STANDBY, AT91_PM_ULP0, AT91_PM_ULP0_FAST, AT91_PM_ULP1,
1597 AT91_PM_BACKUP,
1598 };
1599 static const u32 iomaps[] __initconst = {
1600 [AT91_PM_ULP0] = AT91_PM_IOMAP(ETHC),
1601 [AT91_PM_ULP0_FAST] = AT91_PM_IOMAP(ETHC),
1602 [AT91_PM_ULP1] = AT91_PM_IOMAP(SHDWC) |
1603 AT91_PM_IOMAP(ETHC),
1604 [AT91_PM_BACKUP] = AT91_PM_IOMAP(SHDWC) |
1605 AT91_PM_IOMAP(SFRBU),
1606 };
1607 int ret;
1608
1609 if (!IS_ENABLED(CONFIG_SOC_SAMA5D2))
1610 return;
1611
1612 if (IS_ENABLED(CONFIG_ATMEL_SECURE_PM)) {
1613 pr_warn("AT91: Secure PM: ignoring standby mode\n");
1614 at91_pm_secure_init();
1615 return;
1616 }
1617
1618 at91_pm_modes_validate(modes, ARRAY_SIZE(modes));
1619 at91_pm_modes_init(iomaps, ARRAY_SIZE(iomaps));
1620 ret = at91_dt_ramc(false);
1621 if (ret)
1622 return;
1623
1624 at91_pm_init(NULL);
1625
1626 soc_pm.ws_ids = sama5d2_ws_ids;
1627 soc_pm.config_shdwc_ws = at91_sama5d2_config_shdwc_ws;
1628 soc_pm.config_pmc_ws = at91_sama5d2_config_pmc_ws;
1629
1630 soc_pm.sfrbu_regs.pswbu.key = (0x4BD20C << 8);
1631 soc_pm.sfrbu_regs.pswbu.ctrl = BIT(0);
1632 soc_pm.sfrbu_regs.pswbu.softsw = BIT(1);
1633 soc_pm.sfrbu_regs.pswbu.state = BIT(3);
1634
1635 /* Quirk applies to ULP0, ULP0 fast and ULP1 modes. */
1636 soc_pm.quirks.eth[AT91_PM_G_ETH].modes = BIT(AT91_PM_ULP0) |
1637 BIT(AT91_PM_ULP0_FAST) |
1638 BIT(AT91_PM_ULP1);
1639 /*
1640 * Do not suspend in ULP0, ULP0 fast if GETH is the only wakeup
1641 * source.
1642 */
1643 soc_pm.quirks.eth[AT91_PM_G_ETH].dns_modes = BIT(AT91_PM_ULP0) |
1644 BIT(AT91_PM_ULP0_FAST);
1645}
1646
1647void __init sama7_pm_init(void)
1648{
1649 static const int modes[] __initconst = {
1650 AT91_PM_STANDBY, AT91_PM_ULP0, AT91_PM_ULP1, AT91_PM_BACKUP,
1651 };
1652 static const u32 iomaps[] __initconst = {
1653 [AT91_PM_ULP0] = AT91_PM_IOMAP(SFRBU),
1654 [AT91_PM_ULP1] = AT91_PM_IOMAP(SFRBU) |
1655 AT91_PM_IOMAP(SHDWC) |
1656 AT91_PM_IOMAP(ETHC),
1657 [AT91_PM_BACKUP] = AT91_PM_IOMAP(SFRBU) |
1658 AT91_PM_IOMAP(SHDWC),
1659 };
1660 int ret;
1661
1662 if (!IS_ENABLED(CONFIG_SOC_SAMA7))
1663 return;
1664
1665 at91_pm_modes_validate(modes, ARRAY_SIZE(modes));
1666
1667 ret = at91_dt_ramc(true);
1668 if (ret)
1669 return;
1670
1671 at91_pm_modes_init(iomaps, ARRAY_SIZE(iomaps));
1672 at91_pm_init(NULL);
1673
1674 soc_pm.ws_ids = sama7g5_ws_ids;
1675 soc_pm.config_pmc_ws = at91_sam9x60_config_pmc_ws;
1676
1677 soc_pm.sfrbu_regs.pswbu.key = (0x4BD20C << 8);
1678 soc_pm.sfrbu_regs.pswbu.ctrl = BIT(0);
1679 soc_pm.sfrbu_regs.pswbu.softsw = BIT(1);
1680 soc_pm.sfrbu_regs.pswbu.state = BIT(2);
1681
1682 /* Quirks applies to ULP1 for both Ethernet interfaces. */
1683 soc_pm.quirks.eth[AT91_PM_E_ETH].modes = BIT(AT91_PM_ULP1);
1684 soc_pm.quirks.eth[AT91_PM_G_ETH].modes = BIT(AT91_PM_ULP1);
1685}
1686
1687static int __init at91_pm_modes_select(char *str)
1688{
1689 char *s;
1690 substring_t args[MAX_OPT_ARGS];
1691 int standby, suspend;
1692
1693 if (!str)
1694 return 0;
1695
1696 s = strsep(&str, ",");
1697 standby = match_token(s, pm_modes, args);
1698 if (standby < 0)
1699 return 0;
1700
1701 suspend = match_token(str, pm_modes, args);
1702 if (suspend < 0)
1703 return 0;
1704
1705 soc_pm.data.standby_mode = standby;
1706 soc_pm.data.suspend_mode = suspend;
1707
1708 return 0;
1709}
1710early_param("atmel.pm_modes", at91_pm_modes_select);
1/*
2 * arch/arm/mach-at91/pm.c
3 * AT91 Power Management
4 *
5 * Copyright (C) 2005 David Brownell
6 *
7 * This program is free software; you can redistribute it and/or modify
8 * it under the terms of the GNU General Public License as published by
9 * the Free Software Foundation; either version 2 of the License, or
10 * (at your option) any later version.
11 */
12
13#include <linux/suspend.h>
14#include <linux/sched.h>
15#include <linux/proc_fs.h>
16#include <linux/interrupt.h>
17#include <linux/sysfs.h>
18#include <linux/module.h>
19#include <linux/platform_device.h>
20#include <linux/io.h>
21
22#include <asm/irq.h>
23#include <linux/atomic.h>
24#include <asm/mach/time.h>
25#include <asm/mach/irq.h>
26
27#include <mach/at91_pmc.h>
28#include <mach/gpio.h>
29#include <mach/cpu.h>
30
31#include "generic.h"
32#include "pm.h"
33
34/*
35 * Show the reason for the previous system reset.
36 */
37#if defined(AT91_SHDWC)
38
39#include <mach/at91_rstc.h>
40#include <mach/at91_shdwc.h>
41
42static void __init show_reset_status(void)
43{
44 static char reset[] __initdata = "reset";
45
46 static char general[] __initdata = "general";
47 static char wakeup[] __initdata = "wakeup";
48 static char watchdog[] __initdata = "watchdog";
49 static char software[] __initdata = "software";
50 static char user[] __initdata = "user";
51 static char unknown[] __initdata = "unknown";
52
53 static char signal[] __initdata = "signal";
54 static char rtc[] __initdata = "rtc";
55 static char rtt[] __initdata = "rtt";
56 static char restore[] __initdata = "power-restored";
57
58 char *reason, *r2 = reset;
59 u32 reset_type, wake_type;
60
61 reset_type = at91_sys_read(AT91_RSTC_SR) & AT91_RSTC_RSTTYP;
62 wake_type = at91_sys_read(AT91_SHDW_SR);
63
64 switch (reset_type) {
65 case AT91_RSTC_RSTTYP_GENERAL:
66 reason = general;
67 break;
68 case AT91_RSTC_RSTTYP_WAKEUP:
69 /* board-specific code enabled the wakeup sources */
70 reason = wakeup;
71
72 /* "wakeup signal" */
73 if (wake_type & AT91_SHDW_WAKEUP0)
74 r2 = signal;
75 else {
76 r2 = reason;
77 if (wake_type & AT91_SHDW_RTTWK) /* rtt wakeup */
78 reason = rtt;
79 else if (wake_type & AT91_SHDW_RTCWK) /* rtc wakeup */
80 reason = rtc;
81 else if (wake_type == 0) /* power-restored wakeup */
82 reason = restore;
83 else /* unknown wakeup */
84 reason = unknown;
85 }
86 break;
87 case AT91_RSTC_RSTTYP_WATCHDOG:
88 reason = watchdog;
89 break;
90 case AT91_RSTC_RSTTYP_SOFTWARE:
91 reason = software;
92 break;
93 case AT91_RSTC_RSTTYP_USER:
94 reason = user;
95 break;
96 default:
97 reason = unknown;
98 break;
99 }
100 pr_info("AT91: Starting after %s %s\n", reason, r2);
101}
102#else
103static void __init show_reset_status(void) {}
104#endif
105
106
107static int at91_pm_valid_state(suspend_state_t state)
108{
109 switch (state) {
110 case PM_SUSPEND_ON:
111 case PM_SUSPEND_STANDBY:
112 case PM_SUSPEND_MEM:
113 return 1;
114
115 default:
116 return 0;
117 }
118}
119
120
121static suspend_state_t target_state;
122
123/*
124 * Called after processes are frozen, but before we shutdown devices.
125 */
126static int at91_pm_begin(suspend_state_t state)
127{
128 target_state = state;
129 return 0;
130}
131
132/*
133 * Verify that all the clocks are correct before entering
134 * slow-clock mode.
135 */
136static int at91_pm_verify_clocks(void)
137{
138 unsigned long scsr;
139 int i;
140
141 scsr = at91_sys_read(AT91_PMC_SCSR);
142
143 /* USB must not be using PLLB */
144 if (cpu_is_at91rm9200()) {
145 if ((scsr & (AT91RM9200_PMC_UHP | AT91RM9200_PMC_UDP)) != 0) {
146 pr_err("AT91: PM - Suspend-to-RAM with USB still active\n");
147 return 0;
148 }
149 } else if (cpu_is_at91sam9260() || cpu_is_at91sam9261() || cpu_is_at91sam9263()
150 || cpu_is_at91sam9g20() || cpu_is_at91sam9g10()) {
151 if ((scsr & (AT91SAM926x_PMC_UHP | AT91SAM926x_PMC_UDP)) != 0) {
152 pr_err("AT91: PM - Suspend-to-RAM with USB still active\n");
153 return 0;
154 }
155 } else if (cpu_is_at91cap9()) {
156 if ((scsr & AT91CAP9_PMC_UHP) != 0) {
157 pr_err("AT91: PM - Suspend-to-RAM with USB still active\n");
158 return 0;
159 }
160 }
161
162#ifdef CONFIG_AT91_PROGRAMMABLE_CLOCKS
163 /* PCK0..PCK3 must be disabled, or configured to use clk32k */
164 for (i = 0; i < 4; i++) {
165 u32 css;
166
167 if ((scsr & (AT91_PMC_PCK0 << i)) == 0)
168 continue;
169
170 css = at91_sys_read(AT91_PMC_PCKR(i)) & AT91_PMC_CSS;
171 if (css != AT91_PMC_CSS_SLOW) {
172 pr_err("AT91: PM - Suspend-to-RAM with PCK%d src %d\n", i, css);
173 return 0;
174 }
175 }
176#endif
177
178 return 1;
179}
180
181/*
182 * Call this from platform driver suspend() to see how deeply to suspend.
183 * For example, some controllers (like OHCI) need one of the PLL clocks
184 * in order to act as a wakeup source, and those are not available when
185 * going into slow clock mode.
186 *
187 * REVISIT: generalize as clk_will_be_available(clk)? Other platforms have
188 * the very same problem (but not using at91 main_clk), and it'd be better
189 * to add one generic API rather than lots of platform-specific ones.
190 */
191int at91_suspend_entering_slow_clock(void)
192{
193 return (target_state == PM_SUSPEND_MEM);
194}
195EXPORT_SYMBOL(at91_suspend_entering_slow_clock);
196
197
198static void (*slow_clock)(void);
199
200#ifdef CONFIG_AT91_SLOW_CLOCK
201extern void at91_slow_clock(void);
202extern u32 at91_slow_clock_sz;
203#endif
204
205
206static int at91_pm_enter(suspend_state_t state)
207{
208 u32 saved_lpr;
209 at91_gpio_suspend();
210 at91_irq_suspend();
211
212 pr_debug("AT91: PM - wake mask %08x, pm state %d\n",
213 /* remember all the always-wake irqs */
214 (at91_sys_read(AT91_PMC_PCSR)
215 | (1 << AT91_ID_FIQ)
216 | (1 << AT91_ID_SYS)
217 | (at91_extern_irq))
218 & at91_sys_read(AT91_AIC_IMR),
219 state);
220
221 switch (state) {
222 /*
223 * Suspend-to-RAM is like STANDBY plus slow clock mode, so
224 * drivers must suspend more deeply: only the master clock
225 * controller may be using the main oscillator.
226 */
227 case PM_SUSPEND_MEM:
228 /*
229 * Ensure that clocks are in a valid state.
230 */
231 if (!at91_pm_verify_clocks())
232 goto error;
233
234 /*
235 * Enter slow clock mode by switching over to clk32k and
236 * turning off the main oscillator; reverse on wakeup.
237 */
238 if (slow_clock) {
239#ifdef CONFIG_AT91_SLOW_CLOCK
240 /* copy slow_clock handler to SRAM, and call it */
241 memcpy(slow_clock, at91_slow_clock, at91_slow_clock_sz);
242#endif
243 slow_clock();
244 break;
245 } else {
246 pr_info("AT91: PM - no slow clock mode enabled ...\n");
247 /* FALLTHROUGH leaving master clock alone */
248 }
249
250 /*
251 * STANDBY mode has *all* drivers suspended; ignores irqs not
252 * marked as 'wakeup' event sources; and reduces DRAM power.
253 * But otherwise it's identical to PM_SUSPEND_ON: cpu idle, and
254 * nothing fancy done with main or cpu clocks.
255 */
256 case PM_SUSPEND_STANDBY:
257 /*
258 * NOTE: the Wait-for-Interrupt instruction needs to be
259 * in icache so no SDRAM accesses are needed until the
260 * wakeup IRQ occurs and self-refresh is terminated.
261 * For ARM 926 based chips, this requirement is weaker
262 * as at91sam9 can access a RAM in self-refresh mode.
263 */
264 asm volatile ( "mov r0, #0\n\t"
265 "b 1f\n\t"
266 ".align 5\n\t"
267 "1: mcr p15, 0, r0, c7, c10, 4\n\t"
268 : /* no output */
269 : /* no input */
270 : "r0");
271 saved_lpr = sdram_selfrefresh_enable();
272 wait_for_interrupt_enable();
273 sdram_selfrefresh_disable(saved_lpr);
274 break;
275
276 case PM_SUSPEND_ON:
277 cpu_do_idle();
278 break;
279
280 default:
281 pr_debug("AT91: PM - bogus suspend state %d\n", state);
282 goto error;
283 }
284
285 pr_debug("AT91: PM - wakeup %08x\n",
286 at91_sys_read(AT91_AIC_IPR) & at91_sys_read(AT91_AIC_IMR));
287
288error:
289 target_state = PM_SUSPEND_ON;
290 at91_irq_resume();
291 at91_gpio_resume();
292 return 0;
293}
294
295/*
296 * Called right prior to thawing processes.
297 */
298static void at91_pm_end(void)
299{
300 target_state = PM_SUSPEND_ON;
301}
302
303
304static const struct platform_suspend_ops at91_pm_ops = {
305 .valid = at91_pm_valid_state,
306 .begin = at91_pm_begin,
307 .enter = at91_pm_enter,
308 .end = at91_pm_end,
309};
310
311static int __init at91_pm_init(void)
312{
313#ifdef CONFIG_AT91_SLOW_CLOCK
314 slow_clock = (void *) (AT91_IO_VIRT_BASE - at91_slow_clock_sz);
315#endif
316
317 pr_info("AT91: Power Management%s\n", (slow_clock ? " (with slow clock mode)" : ""));
318
319#ifdef CONFIG_ARCH_AT91RM9200
320 /* AT91RM9200 SDRAM low-power mode cannot be used with self-refresh. */
321 at91_sys_write(AT91_SDRAMC_LPR, 0);
322#endif
323
324 suspend_set_ops(&at91_pm_ops);
325
326 show_reset_status();
327 return 0;
328}
329arch_initcall(at91_pm_init);