forked from ~ljy/RK356X_SDK_RELEASE
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hc
2023-12-09 95099d4622f8cb224d94e314c7a8e0df60b13f87 
 kernel/drivers/soc/ti/pm33xx.c
....@@ -6,6 +6,7 @@
66  *	Vaibhav Bedia, Dave Gerlach
77  */
88 
9
+#include <linux/clk.h>
910 #include <linux/cpu.h>
1011 #include <linux/err.h>
1112 #include <linux/genalloc.h>
....@@ -13,9 +14,13 @@
1314 #include <linux/init.h>
1415 #include <linux/io.h>
1516 #include <linux/module.h>
17
+#include <linux/nvmem-consumer.h>
1618 #include <linux/of.h>
19
+#include <linux/of_address.h>
1720 #include <linux/platform_data/pm33xx.h>
1821 #include <linux/platform_device.h>
22
+#include <linux/rtc.h>
23
+#include <linux/rtc/rtc-omap.h>
1924 #include <linux/sizes.h>
2025 #include <linux/sram.h>
2126 #include <linux/suspend.h>
....@@ -29,11 +34,24 @@
2934 #define AMX3_PM_SRAM_SYMBOL_OFFSET(sym) ((unsigned long)(sym) - \
3035 					 (unsigned long)pm_sram->do_wfi)
3136 
37
+#define RTC_SCRATCH_RESUME_REG	0
38
+#define RTC_SCRATCH_MAGIC_REG	1
39
+#define RTC_REG_BOOT_MAGIC	0x8cd0 /* RTC */
40
+#define GIC_INT_SET_PENDING_BASE 0x200
41
+#define AM43XX_GIC_DIST_BASE	0x48241000
42
+
43
+static void __iomem *rtc_base_virt;
44
+static struct clk *rtc_fck;
45
+static u32 rtc_magic_val;
46
+
3247 static int (*am33xx_do_wfi_sram)(unsigned long unused);
3348 static phys_addr_t am33xx_do_wfi_sram_phys;
3449 
3550 static struct gen_pool *sram_pool, *sram_pool_data;
3651 static unsigned long ocmcram_location, ocmcram_location_data;
52
+
53
+static struct rtc_device *omap_rtc;
54
+static void __iomem *gic_dist_base;
3755 
3856 static struct am33xx_pm_platform_data *pm_ops;
3957 static struct am33xx_pm_sram_addr *pm_sram;
....@@ -41,7 +59,23 @@
4159 static struct device *pm33xx_dev;
4260 static struct wkup_m3_ipc *m3_ipc;
4361 
62
+#ifdef CONFIG_SUSPEND
63
+static int rtc_only_idle;
64
+static int retrigger_irq;
4465 static unsigned long suspend_wfi_flags;
66
+
67
+static struct wkup_m3_wakeup_src wakeup_src = {.irq_nr = 0,
68
+	.src = "Unknown",
69
+};
70
+
71
+static struct wkup_m3_wakeup_src rtc_alarm_wakeup = {
72
+	.irq_nr = 108, .src = "RTC Alarm",
73
+};
74
+
75
+static struct wkup_m3_wakeup_src rtc_ext_wakeup = {
76
+	.irq_nr = 0, .src = "Ext wakeup",
77
+};
78
+#endif
4579 
4680 static u32 sram_suspend_address(unsigned long addr)
4781 {
....@@ -49,13 +83,140 @@
4983 		AMX3_PM_SRAM_SYMBOL_OFFSET(addr));
5084 }
5185 
86
+static int am33xx_push_sram_idle(void)
87
+{
88
+	struct am33xx_pm_ro_sram_data ro_sram_data;
89
+	int ret;
90
+	u32 table_addr, ro_data_addr;
91
+	void *copy_addr;
92
+
93
+	ro_sram_data.amx3_pm_sram_data_virt = ocmcram_location_data;
94
+	ro_sram_data.amx3_pm_sram_data_phys =
95
+		gen_pool_virt_to_phys(sram_pool_data, ocmcram_location_data);
96
+	ro_sram_data.rtc_base_virt = rtc_base_virt;
97
+
98
+	/* Save physical address to calculate resume offset during pm init */
99
+	am33xx_do_wfi_sram_phys = gen_pool_virt_to_phys(sram_pool,
100
+							ocmcram_location);
101
+
102
+	am33xx_do_wfi_sram = sram_exec_copy(sram_pool, (void *)ocmcram_location,
103
+					    pm_sram->do_wfi,
104
+					    *pm_sram->do_wfi_sz);
105
+	if (!am33xx_do_wfi_sram) {
106
+		dev_err(pm33xx_dev,
107
+			"PM: %s: am33xx_do_wfi copy to sram failed\n",
108
+			__func__);
109
+		return -ENODEV;
110
+	}
111
+
112
+	table_addr =
113
+		sram_suspend_address((unsigned long)pm_sram->emif_sram_table);
114
+	ret = ti_emif_copy_pm_function_table(sram_pool, (void *)table_addr);
115
+	if (ret) {
116
+		dev_dbg(pm33xx_dev,
117
+			"PM: %s: EMIF function copy failed\n", __func__);
118
+		return -EPROBE_DEFER;
119
+	}
120
+
121
+	ro_data_addr =
122
+		sram_suspend_address((unsigned long)pm_sram->ro_sram_data);
123
+	copy_addr = sram_exec_copy(sram_pool, (void *)ro_data_addr,
124
+				   &ro_sram_data,
125
+				   sizeof(ro_sram_data));
126
+	if (!copy_addr) {
127
+		dev_err(pm33xx_dev,
128
+			"PM: %s: ro_sram_data copy to sram failed\n",
129
+			__func__);
130
+		return -ENODEV;
131
+	}
132
+
133
+	return 0;
134
+}
135
+
136
+static int am33xx_do_sram_idle(u32 wfi_flags)
137
+{
138
+	int ret = 0;
139
+
140
+	if (!m3_ipc || !pm_ops)
141
+		return 0;
142
+
143
+	if (wfi_flags & WFI_FLAG_WAKE_M3)
144
+		ret = m3_ipc->ops->prepare_low_power(m3_ipc, WKUP_M3_IDLE);
145
+
146
+	return pm_ops->cpu_suspend(am33xx_do_wfi_sram, wfi_flags);
147
+}
148
+
149
+static int __init am43xx_map_gic(void)
150
+{
151
+	gic_dist_base = ioremap(AM43XX_GIC_DIST_BASE, SZ_4K);
152
+
153
+	if (!gic_dist_base)
154
+		return -ENOMEM;
155
+
156
+	return 0;
157
+}
158
+
52159 #ifdef CONFIG_SUSPEND
160
+static struct wkup_m3_wakeup_src rtc_wake_src(void)
161
+{
162
+	u32 i;
163
+
164
+	i = __raw_readl(rtc_base_virt + 0x44) & 0x40;
165
+
166
+	if (i) {
167
+		retrigger_irq = rtc_alarm_wakeup.irq_nr;
168
+		return rtc_alarm_wakeup;
169
+	}
170
+
171
+	retrigger_irq = rtc_ext_wakeup.irq_nr;
172
+
173
+	return rtc_ext_wakeup;
174
+}
175
+
176
+static int am33xx_rtc_only_idle(unsigned long wfi_flags)
177
+{
178
+	omap_rtc_power_off_program(&omap_rtc->dev);
179
+	am33xx_do_wfi_sram(wfi_flags);
180
+	return 0;
181
+}
182
+
183
+/*
184
+ * Note that the RTC module clock must be re-enabled only for rtc+ddr suspend.
185
+ * And looks like the module can stay in SYSC_IDLE_SMART_WKUP mode configured
186
+ * by the interconnect code just fine for both rtc+ddr suspend and retention
187
+ * suspend.
188
+ */
53189 static int am33xx_pm_suspend(suspend_state_t suspend_state)
54190 {
55191 	int i, ret = 0;
56192 
57
-	ret = pm_ops->soc_suspend((unsigned long)suspend_state,
58
-				  am33xx_do_wfi_sram, suspend_wfi_flags);
193
+	if (suspend_state == PM_SUSPEND_MEM &&
194
+	    pm_ops->check_off_mode_enable()) {
195
+		ret = clk_prepare_enable(rtc_fck);
196
+		if (ret) {
197
+			dev_err(pm33xx_dev, "Failed to enable clock: %i\n", ret);
198
+			return ret;
199
+		}
200
+
201
+		pm_ops->save_context();
202
+		suspend_wfi_flags |= WFI_FLAG_RTC_ONLY;
203
+		clk_save_context();
204
+		ret = pm_ops->soc_suspend(suspend_state, am33xx_rtc_only_idle,
205
+					  suspend_wfi_flags);
206
+
207
+		suspend_wfi_flags &= ~WFI_FLAG_RTC_ONLY;
208
+		dev_info(pm33xx_dev, "Entering RTC Only mode with DDR in self-refresh\n");
209
+
210
+		if (!ret) {
211
+			clk_restore_context();
212
+			pm_ops->restore_context();
213
+			m3_ipc->ops->set_rtc_only(m3_ipc);
214
+			am33xx_push_sram_idle();
215
+		}
216
+	} else {
217
+		ret = pm_ops->soc_suspend(suspend_state, am33xx_do_wfi_sram,
218
+					  suspend_wfi_flags);
219
+	}
59220 
60221 	if (ret) {
61222 		dev_err(pm33xx_dev, "PM: Kernel suspend failure\n");
....@@ -77,7 +238,19 @@
77238 				"PM: CM3 returned unknown result = %d\n", i);
78239 			ret = -1;
79240 		}
241
+
242
+		/* print the wakeup reason */
243
+		if (rtc_only_idle) {
244
+			wakeup_src = rtc_wake_src();
245
+			pr_info("PM: Wakeup source %s\n", wakeup_src.src);
246
+		} else {
247
+			pr_info("PM: Wakeup source %s\n",
248
+				m3_ipc->ops->request_wake_src(m3_ipc));
249
+		}
80250 	}
251
+
252
+	if (suspend_state == PM_SUSPEND_MEM && pm_ops->check_off_mode_enable())
253
+		clk_disable_unprepare(rtc_fck);
81254 
82255 	return ret;
83256 }
....@@ -101,6 +274,20 @@
101274 static int am33xx_pm_begin(suspend_state_t state)
102275 {
103276 	int ret = -EINVAL;
277
+	struct nvmem_device *nvmem;
278
+
279
+	if (state == PM_SUSPEND_MEM && pm_ops->check_off_mode_enable()) {
280
+		nvmem = devm_nvmem_device_get(&omap_rtc->dev,
281
+					      "omap_rtc_scratch0");
282
+		if (!IS_ERR(nvmem))
283
+			nvmem_device_write(nvmem, RTC_SCRATCH_MAGIC_REG * 4, 4,
284
+					   (void *)&rtc_magic_val);
285
+		rtc_only_idle = 1;
286
+	} else {
287
+		rtc_only_idle = 0;
288
+	}
289
+
290
+	pm_ops->begin_suspend();
104291 
105292 	switch (state) {
106293 	case PM_SUSPEND_MEM:
....@@ -116,7 +303,35 @@
116303 
117304 static void am33xx_pm_end(void)
118305 {
306
+	u32 val = 0;
307
+	struct nvmem_device *nvmem;
308
+
309
+	nvmem = devm_nvmem_device_get(&omap_rtc->dev, "omap_rtc_scratch0");
310
+	if (IS_ERR(nvmem))
311
+		return;
312
+
119313 	m3_ipc->ops->finish_low_power(m3_ipc);
314
+	if (rtc_only_idle) {
315
+		if (retrigger_irq) {
316
+			/*
317
+			 * 32 bits of Interrupt Set-Pending correspond to 32
318
+			 * 32 interrupts. Compute the bit offset of the
319
+			 * Interrupt and set that particular bit
320
+			 * Compute the register offset by dividing interrupt
321
+			 * number by 32 and mutiplying by 4
322
+			 */
323
+			writel_relaxed(1 << (retrigger_irq & 31),
324
+				       gic_dist_base + GIC_INT_SET_PENDING_BASE
325
+				       + retrigger_irq / 32 * 4);
326
+		}
327
+
328
+		nvmem_device_write(nvmem, RTC_SCRATCH_MAGIC_REG * 4, 4,
329
+				   (void *)&val);
330
+	}
331
+
332
+	rtc_only_idle = 0;
333
+
334
+	pm_ops->finish_suspend();
120335 }
121336 
122337 static int am33xx_pm_valid(suspend_state_t state)
....@@ -219,54 +434,61 @@
219434 	return ret;
220435 }
221436 
222
-static int am33xx_push_sram_idle(void)
437
+static int am33xx_pm_rtc_setup(void)
223438 {
224
-	struct am33xx_pm_ro_sram_data ro_sram_data;
225
-	int ret;
226
-	u32 table_addr, ro_data_addr;
227
-	void *copy_addr;
439
+	struct device_node *np;
440
+	unsigned long val = 0;
441
+	struct nvmem_device *nvmem;
442
+	int error;
228443 
229
-	ro_sram_data.amx3_pm_sram_data_virt = ocmcram_location_data;
230
-	ro_sram_data.amx3_pm_sram_data_phys =
231
-		gen_pool_virt_to_phys(sram_pool_data, ocmcram_location_data);
232
-	ro_sram_data.rtc_base_virt = pm_ops->get_rtc_base_addr();
444
+	np = of_find_node_by_name(NULL, "rtc");
233445 
234
-	/* Save physical address to calculate resume offset during pm init */
235
-	am33xx_do_wfi_sram_phys = gen_pool_virt_to_phys(sram_pool,
236
-							ocmcram_location);
446
+	if (of_device_is_available(np)) {
447
+		/* RTC interconnect target module clock */
448
+		rtc_fck = of_clk_get_by_name(np->parent, "fck");
449
+		if (IS_ERR(rtc_fck))
450
+			return PTR_ERR(rtc_fck);
237451 
238
-	am33xx_do_wfi_sram = sram_exec_copy(sram_pool, (void *)ocmcram_location,
239
-					    pm_sram->do_wfi,
240
-					    *pm_sram->do_wfi_sz);
241
-	if (!am33xx_do_wfi_sram) {
242
-		dev_err(pm33xx_dev,
243
-			"PM: %s: am33xx_do_wfi copy to sram failed\n",
244
-			__func__);
245
-		return -ENODEV;
246
-	}
452
+		rtc_base_virt = of_iomap(np, 0);
453
+		if (!rtc_base_virt) {
454
+			pr_warn("PM: could not iomap rtc");
455
+			error = -ENODEV;
456
+			goto err_clk_put;
457
+		}
247458 
248
-	table_addr =
249
-		sram_suspend_address((unsigned long)pm_sram->emif_sram_table);
250
-	ret = ti_emif_copy_pm_function_table(sram_pool, (void *)table_addr);
251
-	if (ret) {
252
-		dev_dbg(pm33xx_dev,
253
-			"PM: %s: EMIF function copy failed\n", __func__);
254
-		return -EPROBE_DEFER;
255
-	}
459
+		omap_rtc = rtc_class_open("rtc0");
460
+		if (!omap_rtc) {
461
+			pr_warn("PM: rtc0 not available");
462
+			error = -EPROBE_DEFER;
463
+			goto err_iounmap;
464
+		}
256465 
257
-	ro_data_addr =
258
-		sram_suspend_address((unsigned long)pm_sram->ro_sram_data);
259
-	copy_addr = sram_exec_copy(sram_pool, (void *)ro_data_addr,
260
-				   &ro_sram_data,
261
-				   sizeof(ro_sram_data));
262
-	if (!copy_addr) {
263
-		dev_err(pm33xx_dev,
264
-			"PM: %s: ro_sram_data copy to sram failed\n",
265
-			__func__);
266
-		return -ENODEV;
466
+		nvmem = devm_nvmem_device_get(&omap_rtc->dev,
467
+					      "omap_rtc_scratch0");
468
+		if (!IS_ERR(nvmem)) {
469
+			nvmem_device_read(nvmem, RTC_SCRATCH_MAGIC_REG * 4,
470
+					  4, (void *)&rtc_magic_val);
471
+			if ((rtc_magic_val & 0xffff) != RTC_REG_BOOT_MAGIC)
472
+				pr_warn("PM: bootloader does not support rtc-only!\n");
473
+
474
+			nvmem_device_write(nvmem, RTC_SCRATCH_MAGIC_REG * 4,
475
+					   4, (void *)&val);
476
+			val = pm_sram->resume_address;
477
+			nvmem_device_write(nvmem, RTC_SCRATCH_RESUME_REG * 4,
478
+					   4, (void *)&val);
479
+		}
480
+	} else {
481
+		pr_warn("PM: no-rtc available, rtc-only mode disabled.\n");
267482 	}
268483 
269484 	return 0;
485
+
486
+err_iounmap:
487
+	iounmap(rtc_base_virt);
488
+err_clk_put:
489
+	clk_put(rtc_fck);
490
+
491
+	return error;
270492 }
271493 
272494 static int am33xx_pm_probe(struct platform_device *pdev)
....@@ -284,10 +506,22 @@
284506 		return -ENODEV;
285507 	}
286508 
509
+	ret = am43xx_map_gic();
510
+	if (ret) {
511
+		pr_err("PM: Could not ioremap GIC base\n");
512
+		return ret;
513
+	}
514
+
287515 	pm_sram = pm_ops->get_sram_addrs();
288516 	if (!pm_sram) {
289517 		dev_err(dev, "PM: Cannot get PM asm function addresses!!\n");
290518 		return -ENODEV;
519
+	}
520
+
521
+	m3_ipc = wkup_m3_ipc_get();
522
+	if (!m3_ipc) {
523
+		pr_err("PM: Cannot get wkup_m3_ipc handle\n");
524
+		return -EPROBE_DEFER;
291525 	}
292526 
293527 	pm33xx_dev = dev;
....@@ -296,22 +530,18 @@
296530 	if (ret)
297531 		return ret;
298532 
299
-	ret = am33xx_push_sram_idle();
533
+	ret = am33xx_pm_rtc_setup();
300534 	if (ret)
301535 		goto err_free_sram;
302536 
303
-	m3_ipc = wkup_m3_ipc_get();
304
-	if (!m3_ipc) {
305
-		dev_dbg(dev, "PM: Cannot get wkup_m3_ipc handle\n");
306
-		ret = -EPROBE_DEFER;
307
-		goto err_free_sram;
308
-	}
537
+	ret = am33xx_push_sram_idle();
538
+	if (ret)
539
+		goto err_unsetup_rtc;
309540 
310541 	am33xx_pm_set_ipc_ops();
311542 
312543 #ifdef CONFIG_SUSPEND
313544 	suspend_set_ops(&am33xx_pm_ops);
314
-#endif /* CONFIG_SUSPEND */
315545 
316546 	/*
317547 	 * For a system suspend we must flush the caches, we want
....@@ -323,8 +553,9 @@
323553 	suspend_wfi_flags |= WFI_FLAG_SELF_REFRESH;
324554 	suspend_wfi_flags |= WFI_FLAG_SAVE_EMIF;
325555 	suspend_wfi_flags |= WFI_FLAG_WAKE_M3;
556
+#endif /* CONFIG_SUSPEND */
326557 
327
-	ret = pm_ops->init();
558
+	ret = pm_ops->init(am33xx_do_sram_idle);
328559 	if (ret) {
329560 		dev_err(dev, "Unable to call core pm init!\n");
330561 		ret = -ENODEV;
....@@ -335,6 +566,9 @@
335566 
336567 err_put_wkup_m3_ipc:
337568 	wkup_m3_ipc_put(m3_ipc);
569
+err_unsetup_rtc:
570
+	iounmap(rtc_base_virt);
571
+	clk_put(rtc_fck);
338572 err_free_sram:
339573 	am33xx_pm_free_sram();
340574 	pm33xx_dev = NULL;
....@@ -343,9 +577,13 @@
343577 
344578 static int am33xx_pm_remove(struct platform_device *pdev)
345579 {
580
+	if (pm_ops->deinit)
581
+		pm_ops->deinit();
346582 	suspend_set_ops(NULL);
347583 	wkup_m3_ipc_put(m3_ipc);
348584 	am33xx_pm_free_sram();
585
+	iounmap(rtc_base_virt);
586
+	clk_put(rtc_fck);
349587 	return 0;
350588 }
351589