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Merge branch 'for-4.20/apple' into for-linus
[linux-2.6-block.git] / drivers / soc / bcm / brcmstb / pm / pm-arm.c
CommitLineData
0b741b82
BN		 1/*
2 * ARM-specific support for Broadcom STB S2/S3/S5 power management
3 *
4 * S2: clock gate CPUs and as many peripherals as possible
5 * S3: power off all of the chip except the Always ON (AON) island; keep DDR is
6 * self-refresh
7 * S5: (a.k.a. S3 cold boot) much like S3, except DDR is powered down, so we
8 * treat this mode like a soft power-off, with wakeup allowed from AON
9 *
10 * Copyright © 2014-2017 Broadcom
11 *
12 * This program is free software; you can redistribute it and/or modify
13 * it under the terms of the GNU General Public License version 2 as
14 * published by the Free Software Foundation.
15 *
16 * This program is distributed in the hope that it will be useful,
17 * but WITHOUT ANY WARRANTY; without even the implied warranty of
18 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
19 * GNU General Public License for more details.
20 */
21
22#define pr_fmt(fmt) "brcmstb-pm: " fmt
23
24#include <linux/bitops.h>
25#include <linux/compiler.h>
26#include <linux/delay.h>
27#include <linux/dma-mapping.h>
28#include <linux/err.h>
29#include <linux/init.h>
30#include <linux/io.h>
31#include <linux/ioport.h>
32#include <linux/kconfig.h>
33#include <linux/kernel.h>
34#include <linux/memblock.h>
35#include <linux/module.h>
36#include <linux/notifier.h>
37#include <linux/of.h>
38#include <linux/of_address.h>
39#include <linux/platform_device.h>
40#include <linux/pm.h>
41#include <linux/printk.h>
42#include <linux/proc_fs.h>
43#include <linux/sizes.h>
44#include <linux/slab.h>
45#include <linux/sort.h>
46#include <linux/suspend.h>
47#include <linux/types.h>
48#include <linux/uaccess.h>
49#include <linux/soc/brcmstb/brcmstb.h>
50
51#include <asm/fncpy.h>
52#include <asm/setup.h>
53#include <asm/suspend.h>
54
55#include "pm.h"
56#include "aon_defs.h"
57
58#define SHIMPHY_DDR_PAD_CNTRL 0x8c
59
60/* Method #0 */
61#define SHIMPHY_PAD_PLL_SEQUENCE BIT(8)
62#define SHIMPHY_PAD_GATE_PLL_S3 BIT(9)
63
64/* Method #1 */
65#define PWRDWN_SEQ_NO_SEQUENCING 0
66#define PWRDWN_SEQ_HOLD_CHANNEL 1
67#define PWRDWN_SEQ_RESET_PLL 2
68#define PWRDWN_SEQ_POWERDOWN_PLL 3
69
70#define SHIMPHY_PAD_S3_PWRDWN_SEQ_MASK 0x00f00000
71#define SHIMPHY_PAD_S3_PWRDWN_SEQ_SHIFT 20
72
73#define DDR_FORCE_CKE_RST_N BIT(3)
74#define DDR_PHY_RST_N BIT(2)
75#define DDR_PHY_CKE BIT(1)
76
77#define DDR_PHY_NO_CHANNEL 0xffffffff
78
79#define MAX_NUM_MEMC 3
80
81struct brcmstb_memc {
82 void __iomem *ddr_phy_base;
83 void __iomem *ddr_shimphy_base;
84 void __iomem *ddr_ctrl;
85};
86
87struct brcmstb_pm_control {
88 void __iomem *aon_ctrl_base;
89 void __iomem *aon_sram;
90 struct brcmstb_memc memcs[MAX_NUM_MEMC];
91
92 void __iomem *boot_sram;
93 size_t boot_sram_len;
94
95 bool support_warm_boot;
96 size_t pll_status_offset;
97 int num_memc;
98
99 struct brcmstb_s3_params *s3_params;
100 dma_addr_t s3_params_pa;
101 int s3entry_method;
102 u32 warm_boot_offset;
103 u32 phy_a_standby_ctrl_offs;
104 u32 phy_b_standby_ctrl_offs;
105 bool needs_ddr_pad;
106 struct platform_device *pdev;
107};
108
109enum bsp_initiate_command {
110 BSP_CLOCK_STOP = 0x00,
111 BSP_GEN_RANDOM_KEY = 0x4A,
112 BSP_RESTORE_RANDOM_KEY = 0x55,
113 BSP_GEN_FIXED_KEY = 0x63,
114};
115
116#define PM_INITIATE 0x01
117#define PM_INITIATE_SUCCESS 0x00
118#define PM_INITIATE_FAIL 0xfe
119
120static struct brcmstb_pm_control ctrl;
121
122static int (*brcmstb_pm_do_s2_sram)(void __iomem *aon_ctrl_base,
123 void __iomem *ddr_phy_pll_status);
124
125static int brcmstb_init_sram(struct device_node *dn)
126{
127 void __iomem *sram;
128 struct resource res;
129 int ret;
130
131 ret = of_address_to_resource(dn, 0, &res);
132 if (ret)
133 return ret;
134
135 /* Uncached, executable remapping of SRAM */
136 sram = __arm_ioremap_exec(res.start, resource_size(&res), false);
137 if (!sram)
138 return -ENOMEM;
139
140 ctrl.boot_sram = sram;
141 ctrl.boot_sram_len = resource_size(&res);
142
143 return 0;
144}
145
146static const struct of_device_id sram_dt_ids[] = {
147 { .compatible = "mmio-sram" },
148 { /* sentinel */ }
149};
150
151static int do_bsp_initiate_command(enum bsp_initiate_command cmd)
152{
153 void __iomem *base = ctrl.aon_ctrl_base;
154 int ret;
155 int timeo = 1000 * 1000; /* 1 second */
156
157 writel_relaxed(0, base + AON_CTRL_PM_INITIATE);
158 (void)readl_relaxed(base + AON_CTRL_PM_INITIATE);
159
160 /* Go! */
161 writel_relaxed((cmd << 1) | PM_INITIATE, base + AON_CTRL_PM_INITIATE);
162
163 /*
164 * If firmware doesn't support the 'ack', then just assume it's done
165 * after 10ms. Note that this only works for command 0, BSP_CLOCK_STOP
166 */
167 if (of_machine_is_compatible("brcm,bcm74371a0")) {
168 (void)readl_relaxed(base + AON_CTRL_PM_INITIATE);
169 mdelay(10);
170 return 0;
171 }
172
173 for (;;) {
174 ret = readl_relaxed(base + AON_CTRL_PM_INITIATE);
175 if (!(ret & PM_INITIATE))
176 break;
177 if (timeo <= 0) {
178 pr_err("error: timeout waiting for BSP (%x)\n", ret);
179 break;
180 }
181 timeo -= 50;
182 udelay(50);
183 }
184
185 return (ret & 0xff) != PM_INITIATE_SUCCESS;
186}
187
188static int brcmstb_pm_handshake(void)
189{
190 void __iomem *base = ctrl.aon_ctrl_base;
191 u32 tmp;
192 int ret;
193
194 /* BSP power handshake, v1 */
195 tmp = readl_relaxed(base + AON_CTRL_HOST_MISC_CMDS);
196 tmp &= ~1UL;
197 writel_relaxed(tmp, base + AON_CTRL_HOST_MISC_CMDS);
198 (void)readl_relaxed(base + AON_CTRL_HOST_MISC_CMDS);
199
200 ret = do_bsp_initiate_command(BSP_CLOCK_STOP);
201 if (ret)
202 pr_err("BSP handshake failed\n");
203
204 /*
205 * HACK: BSP may have internal race on the CLOCK_STOP command.
206 * Avoid touching the BSP for a few milliseconds.
207 */
208 mdelay(3);
209
210 return ret;
211}
212
213static inline void shimphy_set(u32 value, u32 mask)
214{
215 int i;
216
217 if (!ctrl.needs_ddr_pad)
218 return;
219
220 for (i = 0; i < ctrl.num_memc; i++) {
221 u32 tmp;
222
223 tmp = readl_relaxed(ctrl.memcs[i].ddr_shimphy_base +
224 SHIMPHY_DDR_PAD_CNTRL);
225 tmp = value | (tmp & mask);
226 writel_relaxed(tmp, ctrl.memcs[i].ddr_shimphy_base +
227 SHIMPHY_DDR_PAD_CNTRL);
228 }
229 wmb(); /* Complete sequence in order. */
230}
231
232static inline void ddr_ctrl_set(bool warmboot)
233{
234 int i;
235
236 for (i = 0; i < ctrl.num_memc; i++) {
237 u32 tmp;
238
239 tmp = readl_relaxed(ctrl.memcs[i].ddr_ctrl +
240 ctrl.warm_boot_offset);
241 if (warmboot)
242 tmp |= 1;
243 else
244 tmp &= ~1; /* Cold boot */
245 writel_relaxed(tmp, ctrl.memcs[i].ddr_ctrl +
246 ctrl.warm_boot_offset);
247 }
248 /* Complete sequence in order */
249 wmb();
250}
251
252static inline void s3entry_method0(void)
253{
254 shimphy_set(SHIMPHY_PAD_GATE_PLL_S3 | SHIMPHY_PAD_PLL_SEQUENCE,
255 0xffffffff);
256}
257
258static inline void s3entry_method1(void)
259{
260 /*
261 * S3 Entry Sequence
262 * -----------------
263 * Step 1: SHIMPHY_ADDR_CNTL_0_DDR_PAD_CNTRL [ S3_PWRDWN_SEQ ] = 3
264 * Step 2: MEMC_DDR_0_WARM_BOOT [ WARM_BOOT ] = 1
265 */
266 shimphy_set((PWRDWN_SEQ_POWERDOWN_PLL <<
267 SHIMPHY_PAD_S3_PWRDWN_SEQ_SHIFT),
268 ~SHIMPHY_PAD_S3_PWRDWN_SEQ_MASK);
269
270 ddr_ctrl_set(true);
271}
272
273static inline void s5entry_method1(void)
274{
275 int i;
276
277 /*
278 * S5 Entry Sequence
279 * -----------------
280 * Step 1: SHIMPHY_ADDR_CNTL_0_DDR_PAD_CNTRL [ S3_PWRDWN_SEQ ] = 3
281 * Step 2: MEMC_DDR_0_WARM_BOOT [ WARM_BOOT ] = 0
282 * Step 3: DDR_PHY_CONTROL_REGS_[AB]_0_STANDBY_CONTROL[ CKE ] = 0
283 * DDR_PHY_CONTROL_REGS_[AB]_0_STANDBY_CONTROL[ RST_N ] = 0
284 */
285 shimphy_set((PWRDWN_SEQ_POWERDOWN_PLL <<
286 SHIMPHY_PAD_S3_PWRDWN_SEQ_SHIFT),
287 ~SHIMPHY_PAD_S3_PWRDWN_SEQ_MASK);
288
289 ddr_ctrl_set(false);
290
291 for (i = 0; i < ctrl.num_memc; i++) {
292 u32 tmp;
293
294 /* Step 3: Channel A (RST_N = CKE = 0) */
295 tmp = readl_relaxed(ctrl.memcs[i].ddr_phy_base +
296 ctrl.phy_a_standby_ctrl_offs);
297 tmp &= ~(DDR_PHY_RST_N | DDR_PHY_RST_N);
298 writel_relaxed(tmp, ctrl.memcs[i].ddr_phy_base +
299 ctrl.phy_a_standby_ctrl_offs);
300
301 /* Step 3: Channel B? */
302 if (ctrl.phy_b_standby_ctrl_offs != DDR_PHY_NO_CHANNEL) {
303 tmp = readl_relaxed(ctrl.memcs[i].ddr_phy_base +
304 ctrl.phy_b_standby_ctrl_offs);
305 tmp &= ~(DDR_PHY_RST_N | DDR_PHY_RST_N);
306 writel_relaxed(tmp, ctrl.memcs[i].ddr_phy_base +
307 ctrl.phy_b_standby_ctrl_offs);
308 }
309 }
310 /* Must complete */
311 wmb();
312}
313
314/*
315 * Run a Power Management State Machine (PMSM) shutdown command and put the CPU
316 * into a low-power mode
317 */
318static void brcmstb_do_pmsm_power_down(unsigned long base_cmd, bool onewrite)
319{
320 void __iomem *base = ctrl.aon_ctrl_base;
321
322 if ((ctrl.s3entry_method == 1) && (base_cmd == PM_COLD_CONFIG))
323 s5entry_method1();
324
325 /* pm_start_pwrdn transition 0->1 */
326 writel_relaxed(base_cmd, base + AON_CTRL_PM_CTRL);
327
328 if (!onewrite) {
329 (void)readl_relaxed(base + AON_CTRL_PM_CTRL);
330
331 writel_relaxed(base_cmd | PM_PWR_DOWN, base + AON_CTRL_PM_CTRL);
332 (void)readl_relaxed(base + AON_CTRL_PM_CTRL);
333 }
334 wfi();
335}
336
337/* Support S5 cold boot out of "poweroff" */
338static void brcmstb_pm_poweroff(void)
339{
340 brcmstb_pm_handshake();
341
342 /* Clear magic S3 warm-boot value */
343 writel_relaxed(0, ctrl.aon_sram + AON_REG_MAGIC_FLAGS);
344 (void)readl_relaxed(ctrl.aon_sram + AON_REG_MAGIC_FLAGS);
345
346 /* Skip wait-for-interrupt signal; just use a countdown */
347 writel_relaxed(0x10, ctrl.aon_ctrl_base + AON_CTRL_PM_CPU_WAIT_COUNT);
348 (void)readl_relaxed(ctrl.aon_ctrl_base + AON_CTRL_PM_CPU_WAIT_COUNT);
349
350 if (ctrl.s3entry_method == 1) {
351 shimphy_set((PWRDWN_SEQ_POWERDOWN_PLL <<
352 SHIMPHY_PAD_S3_PWRDWN_SEQ_SHIFT),
353 ~SHIMPHY_PAD_S3_PWRDWN_SEQ_MASK);
354 ddr_ctrl_set(false);
355 brcmstb_do_pmsm_power_down(M1_PM_COLD_CONFIG, true);
356 return; /* We should never actually get here */
357 }
358
359 brcmstb_do_pmsm_power_down(PM_COLD_CONFIG, false);
360}
361
362static void *brcmstb_pm_copy_to_sram(void *fn, size_t len)
363{
364 unsigned int size = ALIGN(len, FNCPY_ALIGN);
365
366 if (ctrl.boot_sram_len < size) {
367 pr_err("standby code will not fit in SRAM\n");
368 return NULL;
369 }
370
371 return fncpy(ctrl.boot_sram, fn, size);
372}
373
374/*
375 * S2 suspend/resume picks up where we left off, so we must execute carefully
376 * from SRAM, in order to allow DDR to come back up safely before we continue.
377 */
378static int brcmstb_pm_s2(void)
379{
380 /* A previous S3 can set a value hazardous to S2, so make sure. */
381 if (ctrl.s3entry_method == 1) {
382 shimphy_set((PWRDWN_SEQ_NO_SEQUENCING <<
383 SHIMPHY_PAD_S3_PWRDWN_SEQ_SHIFT),
384 ~SHIMPHY_PAD_S3_PWRDWN_SEQ_MASK);
385 ddr_ctrl_set(false);
386 }
387
388 brcmstb_pm_do_s2_sram = brcmstb_pm_copy_to_sram(&brcmstb_pm_do_s2,
389 brcmstb_pm_do_s2_sz);
390 if (!brcmstb_pm_do_s2_sram)
391 return -EINVAL;
392
393 return brcmstb_pm_do_s2_sram(ctrl.aon_ctrl_base,
394 ctrl.memcs[0].ddr_phy_base +
395 ctrl.pll_status_offset);
396}
397
398/*
399 * This function is called on a new stack, so don't allow inlining (which will
400 * generate stack references on the old stack). It cannot be made static because
401 * it is referenced from brcmstb_pm_s3()
402 */
403noinline int brcmstb_pm_s3_finish(void)
404{
405 struct brcmstb_s3_params *params = ctrl.s3_params;
406 dma_addr_t params_pa = ctrl.s3_params_pa;
407 phys_addr_t reentry = virt_to_phys(&cpu_resume);
408 enum bsp_initiate_command cmd;
409 u32 flags;
410
411 /*
412 * Clear parameter structure, but not DTU area, which has already been
413 * filled in. We know DTU is a the end, so we can just subtract its
414 * size.
415 */
416 memset(params, 0, sizeof(*params) - sizeof(params->dtu));
417
418 flags = readl_relaxed(ctrl.aon_sram + AON_REG_MAGIC_FLAGS);
419
420 flags &= S3_BOOTLOADER_RESERVED;
421 flags |= S3_FLAG_NO_MEM_VERIFY;
422 flags |= S3_FLAG_LOAD_RANDKEY;
423
424 /* Load random / fixed key */
425 if (flags & S3_FLAG_LOAD_RANDKEY)
426 cmd = BSP_GEN_RANDOM_KEY;
427 else
428 cmd = BSP_GEN_FIXED_KEY;
429 if (do_bsp_initiate_command(cmd)) {
430 pr_info("key loading failed\n");
431 return -EIO;
432 }
433
434 params->magic = BRCMSTB_S3_MAGIC;
435 params->reentry = reentry;
436
437 /* No more writes to DRAM */
438 flush_cache_all();
439
440 flags |= BRCMSTB_S3_MAGIC_SHORT;
441
442 writel_relaxed(flags, ctrl.aon_sram + AON_REG_MAGIC_FLAGS);
443 writel_relaxed(lower_32_bits(params_pa),
444 ctrl.aon_sram + AON_REG_CONTROL_LOW);
445 writel_relaxed(upper_32_bits(params_pa),
446 ctrl.aon_sram + AON_REG_CONTROL_HIGH);
447
448 switch (ctrl.s3entry_method) {
449 case 0:
450 s3entry_method0();
451 brcmstb_do_pmsm_power_down(PM_WARM_CONFIG, false);
452 break;
453 case 1:
454 s3entry_method1();
455 brcmstb_do_pmsm_power_down(M1_PM_WARM_CONFIG, true);
456 break;
457 default:
458 return -EINVAL;
459 }
460
461 /* Must have been interrupted from wfi()? */
462 return -EINTR;
463}
464
465static int brcmstb_pm_do_s3(unsigned long sp)
466{
467 unsigned long save_sp;
468 int ret;
469
470 asm volatile (
471 "mov %[save], sp\n"
472 "mov sp, %[new]\n"
473 "bl brcmstb_pm_s3_finish\n"
474 "mov %[ret], r0\n"
475 "mov %[new], sp\n"
476 "mov sp, %[save]\n"
477 : [save] "=&r" (save_sp), [ret] "=&r" (ret)
478 : [new] "r" (sp)
479 );
480
481 return ret;
482}
483
484static int brcmstb_pm_s3(void)
485{
486 void __iomem *sp = ctrl.boot_sram + ctrl.boot_sram_len;
487
488 return cpu_suspend((unsigned long)sp, brcmstb_pm_do_s3);
489}
490
491static int brcmstb_pm_standby(bool deep_standby)
492{
493 int ret;
494
495 if (brcmstb_pm_handshake())
496 return -EIO;
497
498 if (deep_standby)
499 ret = brcmstb_pm_s3();
500 else
501 ret = brcmstb_pm_s2();
502 if (ret)
503 pr_err("%s: standby failed\n", __func__);
504
505 return ret;
506}
507
508static int brcmstb_pm_enter(suspend_state_t state)
509{
510 int ret = -EINVAL;
511
512 switch (state) {
513 case PM_SUSPEND_STANDBY:
514 ret = brcmstb_pm_standby(false);
515 break;
516 case PM_SUSPEND_MEM:
517 ret = brcmstb_pm_standby(true);
518 break;
519 }
520
521 return ret;
522}
523
524static int brcmstb_pm_valid(suspend_state_t state)
525{
526 switch (state) {
527 case PM_SUSPEND_STANDBY:
528 return true;
529 case PM_SUSPEND_MEM:
530 return ctrl.support_warm_boot;
531 default:
532 return false;
533 }
534}
535
536static const struct platform_suspend_ops brcmstb_pm_ops = {
537 .enter = brcmstb_pm_enter,
538 .valid = brcmstb_pm_valid,
539};
540
541static const struct of_device_id aon_ctrl_dt_ids[] = {
542 { .compatible = "brcm,brcmstb-aon-ctrl" },
543 {}
544};
545
546struct ddr_phy_ofdata {
547 bool supports_warm_boot;
548 size_t pll_status_offset;
549 int s3entry_method;
550 u32 warm_boot_offset;
551 u32 phy_a_standby_ctrl_offs;
552 u32 phy_b_standby_ctrl_offs;
553};
554
555static struct ddr_phy_ofdata ddr_phy_71_1 = {
556 .supports_warm_boot = true,
557 .pll_status_offset = 0x0c,
558 .s3entry_method = 1,
559 .warm_boot_offset = 0x2c,
560 .phy_a_standby_ctrl_offs = 0x198,
561 .phy_b_standby_ctrl_offs = DDR_PHY_NO_CHANNEL
562};
563
564static struct ddr_phy_ofdata ddr_phy_72_0 = {
565 .supports_warm_boot = true,
566 .pll_status_offset = 0x10,
567 .s3entry_method = 1,
568 .warm_boot_offset = 0x40,
569 .phy_a_standby_ctrl_offs = 0x2a4,
570 .phy_b_standby_ctrl_offs = 0x8a4
571};
572
573static struct ddr_phy_ofdata ddr_phy_225_1 = {
574 .supports_warm_boot = false,
575 .pll_status_offset = 0x4,
576 .s3entry_method = 0
577};
578
579static struct ddr_phy_ofdata ddr_phy_240_1 = {
580 .supports_warm_boot = true,
581 .pll_status_offset = 0x4,
582 .s3entry_method = 0
583};
584
585static const struct of_device_id ddr_phy_dt_ids[] = {
586 {
587 .compatible = "brcm,brcmstb-ddr-phy-v71.1",
588 .data = &ddr_phy_71_1,
589 },
590 {
591 .compatible = "brcm,brcmstb-ddr-phy-v72.0",
592 .data = &ddr_phy_72_0,
593 },
594 {
595 .compatible = "brcm,brcmstb-ddr-phy-v225.1",
596 .data = &ddr_phy_225_1,
597 },
598 {
599 .compatible = "brcm,brcmstb-ddr-phy-v240.1",
600 .data = &ddr_phy_240_1,
601 },
602 {
603 /* Same as v240.1, for the registers we care about */
604 .compatible = "brcm,brcmstb-ddr-phy-v240.2",
605 .data = &ddr_phy_240_1,
606 },
607 {}
608};
609
610struct ddr_seq_ofdata {
611 bool needs_ddr_pad;
612 u32 warm_boot_offset;
613};
614
615static const struct ddr_seq_ofdata ddr_seq_b22 = {
616 .needs_ddr_pad = false,
617 .warm_boot_offset = 0x2c,
618};
619
620static const struct ddr_seq_ofdata ddr_seq = {
621 .needs_ddr_pad = true,
622};
623
624static const struct of_device_id ddr_shimphy_dt_ids[] = {
625 { .compatible = "brcm,brcmstb-ddr-shimphy-v1.0" },
626 {}
627};
628
629static const struct of_device_id brcmstb_memc_of_match[] = {
a334e45d
FF		 630 {
631 .compatible = "brcm,brcmstb-memc-ddr-rev-b.2.1",
632 .data = &ddr_seq,
633 },
0b741b82
BN		 634 {
635 .compatible = "brcm,brcmstb-memc-ddr-rev-b.2.2",
636 .data = &ddr_seq_b22,
637 },
a334e45d
FF		 638 {
639 .compatible = "brcm,brcmstb-memc-ddr-rev-b.2.3",
640 .data = &ddr_seq_b22,
641 },
77d89963
DB		 642 {
643 .compatible = "brcm,brcmstb-memc-ddr-rev-b.3.0",
644 .data = &ddr_seq_b22,
645 },
a334e45d
FF		 646 {
647 .compatible = "brcm,brcmstb-memc-ddr-rev-b.3.1",
648 .data = &ddr_seq_b22,
649 },
0b741b82
BN		 650 {
651 .compatible = "brcm,brcmstb-memc-ddr",
652 .data = &ddr_seq,
653 },
654 {},
655};
656
657static void __iomem *brcmstb_ioremap_match(const struct of_device_id *matches,
658 int index, const void **ofdata)
659{
660 struct device_node *dn;
661 const struct of_device_id *match;
662
663 dn = of_find_matching_node_and_match(NULL, matches, &match);
664 if (!dn)
665 return ERR_PTR(-EINVAL);
666
667 if (ofdata)
668 *ofdata = match->data;
669
670 return of_io_request_and_map(dn, index, dn->full_name);
671}
672
673static int brcmstb_pm_panic_notify(struct notifier_block *nb,
674 unsigned long action, void *data)
675{
676 writel_relaxed(BRCMSTB_PANIC_MAGIC, ctrl.aon_sram + AON_REG_PANIC);
677
678 return NOTIFY_DONE;
679}
680
681static struct notifier_block brcmstb_pm_panic_nb = {
682 .notifier_call = brcmstb_pm_panic_notify,
683};
684
685static int brcmstb_pm_probe(struct platform_device *pdev)
686{
687 const struct ddr_phy_ofdata *ddr_phy_data;
688 const struct ddr_seq_ofdata *ddr_seq_data;
689 const struct of_device_id *of_id = NULL;
690 struct device_node *dn;
691 void __iomem *base;
692 int ret, i;
693
694 /* AON ctrl registers */
695 base = brcmstb_ioremap_match(aon_ctrl_dt_ids, 0, NULL);
696 if (IS_ERR(base)) {
697 pr_err("error mapping AON_CTRL\n");
698 return PTR_ERR(base);
699 }
700 ctrl.aon_ctrl_base = base;
701
702 /* AON SRAM registers */
703 base = brcmstb_ioremap_match(aon_ctrl_dt_ids, 1, NULL);
704 if (IS_ERR(base)) {
705 /* Assume standard offset */
706 ctrl.aon_sram = ctrl.aon_ctrl_base +
707 AON_CTRL_SYSTEM_DATA_RAM_OFS;
708 } else {
709 ctrl.aon_sram = base;
710 }
711
712 writel_relaxed(0, ctrl.aon_sram + AON_REG_PANIC);
713
714 /* DDR PHY registers */
715 base = brcmstb_ioremap_match(ddr_phy_dt_ids, 0,
716 (const void **)&ddr_phy_data);
717 if (IS_ERR(base)) {
718 pr_err("error mapping DDR PHY\n");
719 return PTR_ERR(base);
720 }
721 ctrl.support_warm_boot = ddr_phy_data->supports_warm_boot;
722 ctrl.pll_status_offset = ddr_phy_data->pll_status_offset;
723 /* Only need DDR PHY 0 for now? */
724 ctrl.memcs[0].ddr_phy_base = base;
725 ctrl.s3entry_method = ddr_phy_data->s3entry_method;
726 ctrl.phy_a_standby_ctrl_offs = ddr_phy_data->phy_a_standby_ctrl_offs;
727 ctrl.phy_b_standby_ctrl_offs = ddr_phy_data->phy_b_standby_ctrl_offs;
728 /*
729 * Slightly grosss to use the phy ver to get a memc,
730 * offset but that is the only versioned things so far
731 * we can test for.
732 */
733 ctrl.warm_boot_offset = ddr_phy_data->warm_boot_offset;
734
735 /* DDR SHIM-PHY registers */
736 for_each_matching_node(dn, ddr_shimphy_dt_ids) {
737 i = ctrl.num_memc;
738 if (i >= MAX_NUM_MEMC) {
739 pr_warn("too many MEMCs (max %d)\n", MAX_NUM_MEMC);
740 break;
741 }
742
743 base = of_io_request_and_map(dn, 0, dn->full_name);
744 if (IS_ERR(base)) {
745 if (!ctrl.support_warm_boot)
746 break;
747
748 pr_err("error mapping DDR SHIMPHY %d\n", i);
749 return PTR_ERR(base);
750 }
751 ctrl.memcs[i].ddr_shimphy_base = base;
752 ctrl.num_memc++;
753 }
754
755 /* Sequencer DRAM Param and Control Registers */
756 i = 0;
757 for_each_matching_node(dn, brcmstb_memc_of_match) {
758 base = of_iomap(dn, 0);
759 if (!base) {
760 pr_err("error mapping DDR Sequencer %d\n", i);
761 return -ENOMEM;
762 }
763
764 of_id = of_match_node(brcmstb_memc_of_match, dn);
765 if (!of_id) {
766 iounmap(base);
767 return -EINVAL;
768 }
769
770 ddr_seq_data = of_id->data;
771 ctrl.needs_ddr_pad = ddr_seq_data->needs_ddr_pad;
772 /* Adjust warm boot offset based on the DDR sequencer */
773 if (ddr_seq_data->warm_boot_offset)
774 ctrl.warm_boot_offset = ddr_seq_data->warm_boot_offset;
775
776 ctrl.memcs[i].ddr_ctrl = base;
777 i++;
778 }
779
780 pr_debug("PM: supports warm boot:%d, method:%d, wboffs:%x\n",
781 ctrl.support_warm_boot, ctrl.s3entry_method,
782 ctrl.warm_boot_offset);
783
784 dn = of_find_matching_node(NULL, sram_dt_ids);
785 if (!dn) {
786 pr_err("SRAM not found\n");
787 return -EINVAL;
788 }
789
790 ret = brcmstb_init_sram(dn);
791 if (ret) {
792 pr_err("error setting up SRAM for PM\n");
793 return ret;
794 }
795
796 ctrl.pdev = pdev;
797
798 ctrl.s3_params = kmalloc(sizeof(*ctrl.s3_params), GFP_KERNEL);
799 if (!ctrl.s3_params)
800 return -ENOMEM;
801 ctrl.s3_params_pa = dma_map_single(&pdev->dev, ctrl.s3_params,
802 sizeof(*ctrl.s3_params),
803 DMA_TO_DEVICE);
804 if (dma_mapping_error(&pdev->dev, ctrl.s3_params_pa)) {
805 pr_err("error mapping DMA memory\n");
806 ret = -ENOMEM;
807 goto out;
808 }
809
810 atomic_notifier_chain_register(&panic_notifier_list,
811 &brcmstb_pm_panic_nb);
812
813 pm_power_off = brcmstb_pm_poweroff;
814 suspend_set_ops(&brcmstb_pm_ops);
815
816 return 0;
817
818out:
819 kfree(ctrl.s3_params);
820
821 pr_warn("PM: initialization failed with code %d\n", ret);
822
823 return ret;
824}
825
826static struct platform_driver brcmstb_pm_driver = {
827 .driver = {
828 .name = "brcmstb-pm",
829 .of_match_table = aon_ctrl_dt_ids,
830 },
831};
832
833static int __init brcmstb_pm_init(void)
834{
835 return platform_driver_probe(&brcmstb_pm_driver,
836 brcmstb_pm_probe);
837}
838module_init(brcmstb_pm_init);
Linux 6.x block layer and io_uring tree(s)