1 // SPDX-License-Identifier: GPL-2.0-or-later
3  * arch/arm/mach-at91/pm.c
16 #include <linux/suspend.h>
26 #include <asm/suspend.h>
34  * struct at91_pm_bu - AT91 power management backup unit data structure
35  * @suspended: true if suspended to backup mode
37  * @canary: canary data for memory checking after exit from backup mode
64  * struct at91_soc_pm - AT91 SoC power management data structure
68  * @data: PM data to be used on last phase of suspend
70  * @bu: backup unit mapped data (for backup mode)
74 	int (*config_shdwc_ws)(void __iomem *shdwc, u32 *mode, u32 *polarity);
75 	int (*config_pmc_ws)(void __iomem *pmc, u32 mode, u32 polarity);
105 	{ AT91_PM_ULP0_FAST,    "ulp0-fast" },
108 	{ -1, NULL },
148 	{ .compatible = "atmel,sama5d2-gem",		.data = &ws_info[0] },
149 	{ .compatible = "atmel,at91rm9200-rtc",		.data = &ws_info[1] },
150 	{ .compatible = "atmel,sama5d3-udc",		.data = &ws_info[2] },
151 	{ .compatible = "atmel,at91rm9200-ohci",	.data = &ws_info[2] },
152 	{ .compatible = "usb-ohci",			.data = &ws_info[2] },
153 	{ .compatible = "atmel,at91sam9g45-ehci",	.data = &ws_info[2] },
154 	{ .compatible = "usb-ehci",			.data = &ws_info[2] },
155 	{ .compatible = "atmel,sama5d2-sdhci",		.data = &ws_info[3] },
160 	{ .compatible = "atmel,at91sam9x5-rtc",		.data = &ws_info[1] },
161 	{ .compatible = "atmel,at91rm9200-ohci",	.data = &ws_info[2] },
162 	{ .compatible = "usb-ohci",			.data = &ws_info[2] },
163 	{ .compatible = "atmel,at91sam9g45-ehci",	.data = &ws_info[2] },
164 	{ .compatible = "usb-ehci",			.data = &ws_info[2] },
165 	{ .compatible = "atmel,at91sam9260-rtt",	.data = &ws_info[4] },
166 	{ .compatible = "cdns,sam9x60-macb",		.data = &ws_info[5] },
171 	{ .compatible = "atmel,at91sam9x5-rtc",		.data = &ws_info[1] },
172 	{ .compatible = "microchip,sama7g5-ohci",	.data = &ws_info[2] },
173 	{ .compatible = "usb-ohci",			.data = &ws_info[2] },
174 	{ .compatible = "atmel,at91sam9g45-ehci",	.data = &ws_info[2] },
175 	{ .compatible = "usb-ehci",			.data = &ws_info[2] },
176 	{ .compatible = "microchip,sama7g5-sdhci",	.data = &ws_info[3] },
177 	{ .compatible = "atmel,at91sam9260-rtt",	.data = &ws_info[4] },
187 	unsigned int mode = 0, polarity = 0, val = 0;  in at91_pm_config_ws()  local
193 		return -EPERM;  in at91_pm_config_ws()
196 		writel(mode, soc_pm.data.pmc + AT91_PMC_FSMR);  in at91_pm_config_ws()
201 		soc_pm.config_shdwc_ws(soc_pm.data.shdwc, &mode, &polarity);  in at91_pm_config_ws()
212 		if (device_may_wakeup(&pdev->dev)) {  in at91_pm_config_ws()
213 			wsi = match->data;  in at91_pm_config_ws()
216 			if (wsi->shdwc_mr_bit && !(val & wsi->shdwc_mr_bit))  in at91_pm_config_ws()
219 			mode |= wsi->pmc_fsmr_bit;  in at91_pm_config_ws()
220 			if (wsi->set_polarity)  in at91_pm_config_ws()
221 				polarity |= wsi->pmc_fsmr_bit;  in at91_pm_config_ws()
225 		put_device(&pdev->dev);  in at91_pm_config_ws()
228 	if (mode) {  in at91_pm_config_ws()
230 			soc_pm.config_pmc_ws(soc_pm.data.pmc, mode, polarity);  in at91_pm_config_ws()
235 	return mode ? 0 : -EPERM;  in at91_pm_config_ws()
238 static int at91_sama5d2_config_shdwc_ws(void __iomem *shdwc, u32 *mode,  in at91_sama5d2_config_shdwc_ws()  argument
245 	*mode |= (val & 0x3ff);  in at91_sama5d2_config_shdwc_ws()
251 static int at91_sama5d2_config_pmc_ws(void __iomem *pmc, u32 mode, u32 polarity)  in at91_sama5d2_config_pmc_ws()  argument
253 	writel(mode, pmc + AT91_PMC_FSMR);  in at91_sama5d2_config_pmc_ws()
259 static int at91_sam9x60_config_pmc_ws(void __iomem *pmc, u32 mode, u32 polarity)  in at91_sam9x60_config_pmc_ws()  argument
261 	writel(mode, pmc + AT91_PMC_FSMR);  in at91_sam9x60_config_pmc_ws()
275 		soc_pm.data.mode = soc_pm.data.suspend_mode;  in at91_pm_begin()
279 		soc_pm.data.mode = soc_pm.data.standby_mode;  in at91_pm_begin()
283 		soc_pm.data.mode = -1;  in at91_pm_begin()
286 	ret = at91_pm_config_ws(soc_pm.data.mode, true);  in at91_pm_begin()
290 	if (soc_pm.data.mode == AT91_PM_BACKUP)  in at91_pm_begin()
291 		soc_pm.bu->suspended = 1;  in at91_pm_begin()
293 		soc_pm.bu->suspended = 0;  in at91_pm_begin()
300  * slow-clock mode.
311 		pr_err("AT91: PM - Suspend-to-RAM with USB still active\n");  in at91_pm_verify_clocks()
323 			pr_err("AT91: PM - Suspend-to-RAM with PCK%d src %d\n", i, css);  in at91_pm_verify_clocks()
332  * Call this from platform driver suspend() to see how deeply to suspend.
335  * going into slow clock mode.
339  * to add one generic API rather than lots of platform-specific ones.
343 	return (soc_pm.data.mode >= AT91_PM_ULP0);  in at91_suspend_entering_slow_clock()
355 	if (soc_pm.data.mode == AT91_PM_BACKUP && soc_pm.data.ramc_phy) {  in at91_suspend_finish()
362 			soc_pm.bu->ddr_phy_calibration[i] =  in at91_suspend_finish()
363 				*((unsigned int *)soc_pm.memcs + (i - 1));  in at91_suspend_finish()
401 	if (soc_pm.data.mode == AT91_PM_BACKUP) {  in at91_pm_suspend()
406 		/* The SRAM is lost between suspend cycles */  in at91_pm_suspend()
418  * STANDBY mode has *all* drivers suspended; ignores irqs not marked as 'wakeup'
422  * AT91_PM_ULP0 is like STANDBY plus slow clock mode, so drivers must
423  * suspend more deeply, the master clock switches to the clk32k and turns off
435 	 * called as part of the generic suspend/resume path.  in at91_pm_enter()
446 		if (soc_pm.data.mode >= AT91_PM_ULP0 &&  in at91_pm_enter()
459 		pr_debug("AT91: PM - bogus suspend state %d\n", state);  in at91_pm_enter()
475 	at91_pm_config_ws(soc_pm.data.mode, false);  in at91_pm_end()
487 	.name = "cpuidle-at91",
491  * The AT91RM9200 goes into self-refresh mode with this command, and will
492  * terminate self-refresh automatically on the next SDRAM access.
494  * Self-refresh mode is exited as soon as a memory access is made, but we don't
495  * know for sure when that happens. However, we need to restore the low-power
496  * mode if it was enabled before going idle. Restoring low-power mode while
497  * still in self-refresh is "not recommended", but seems to work.
517 	/* Those two values allow us to delay self-refresh activation  in at91_ddr_standby()
523 	/* LPDDR1 --> force DDR2 mode during self-refresh */  in at91_ddr_standby()
547 	/* self-refresh mode now */  in at91_ddr_standby()
596 	/* self-refresh mode now */  in at91sam9_sdram_standby()
621 	{ .compatible = "atmel,at91rm9200-sdramc", .data = &ramc_infos[0] },
622 	{ .compatible = "atmel,at91sam9260-sdramc", .data = &ramc_infos[1] },
623 	{ .compatible = "atmel,at91sam9g45-ddramc", .data = &ramc_infos[2] },
624 	{ .compatible = "atmel,sama5d3-ddramc", .data = &ramc_infos[3] },
625 	{ .compatible = "microchip,sama7g5-uddrc", },
630 	{ .compatible = "microchip,sama7g5-ddr3phy", },
647 			ret = -ENOMEM;  in at91_dt_ramc()
651 		ramc = of_id->data;  in at91_dt_ramc()
654 				standby = ramc->idle;  in at91_dt_ramc()
655 			soc_pm.data.memctrl = ramc->memctrl;  in at91_dt_ramc()
663 		ret = -ENODEV;  in at91_dt_ramc()
672 			ret = -ENOMEM;  in at91_dt_ramc()
679 		ret = -ENODEV;  in at91_dt_ramc()
694 		iounmap(soc_pm.data.ramc[--idx]);  in at91_dt_ramc()
703 	 * re-enabled by an interrupt or by a reset.  in at91rm9200_idle()
722 	for_each_compatible_node(node, NULL, "mmio-sram") {  in at91_pm_sram_init()
735 	sram_pool = gen_pool_get(&pdev->dev, NULL);  in at91_pm_sram_init()
755 	/* Copy the pm suspend handler to SRAM */  in at91_pm_sram_init()
761 	put_device(&pdev->dev);  in at91_pm_sram_init()
804 	int ret = -ENODEV, located = 0;  in at91_pm_backup_init()
808 		return -EPERM;  in at91_pm_backup_init()
813 	np = of_find_compatible_node(NULL, NULL, "atmel,sama5d2-securam");  in at91_pm_backup_init()
824 	sram_pool = gen_pool_get(&pdev->dev, NULL);  in at91_pm_backup_init()
833 		ret = -ENOMEM;  in at91_pm_backup_init()
837 	soc_pm.bu->suspended = 0;  in at91_pm_backup_init()
838 	soc_pm.bu->canary = __pa_symbol(&canary);  in at91_pm_backup_init()
839 	soc_pm.bu->resume = __pa_symbol(cpu_resume);  in at91_pm_backup_init()
846 		soc_pm.bu->ddr_phy_calibration[0] = readl(soc_pm.data.ramc_phy +  in at91_pm_backup_init()
853 	put_device(&pdev->dev);  in at91_pm_backup_init()
858 	{ .compatible = "atmel,sama5d2-shdwc" },
859 	{ .compatible = "microchip,sam9x60-shdwc" },
860 	{ .compatible = "microchip,sama7g5-shdwc" },
867 	int ret, mode;  in at91_pm_modes_init()  local
885 				mode = AT91_PM_ULP0;  in at91_pm_modes_init()
887 				mode = AT91_PM_STANDBY;  in at91_pm_modes_init()
890 				soc_pm.data.standby_mode = mode;  in at91_pm_modes_init()
892 				soc_pm.data.suspend_mode = mode;  in at91_pm_modes_init()
901 		np = of_find_compatible_node(NULL, NULL, "atmel,sama5d2-sfrbu");  in at91_pm_modes_init()
911 				mode = AT91_PM_ULP0;  in at91_pm_modes_init()
913 				mode = AT91_PM_STANDBY;  in at91_pm_modes_init()
916 				soc_pm.data.standby_mode = mode;  in at91_pm_modes_init()
918 				soc_pm.data.suspend_mode = mode;  in at91_pm_modes_init()
983 	{ .compatible = "atmel,at91rm9200-pmc", .data = &pmc_infos[0] },
984 	{ .compatible = "atmel,at91sam9260-pmc", .data = &pmc_infos[1] },
985 	{ .compatible = "atmel,at91sam9261-pmc", .data = &pmc_infos[1] },
986 	{ .compatible = "atmel,at91sam9263-pmc", .data = &pmc_infos[1] },
987 	{ .compatible = "atmel,at91sam9g45-pmc", .data = &pmc_infos[2] },
988 	{ .compatible = "atmel,at91sam9n12-pmc", .data = &pmc_infos[1] },
989 	{ .compatible = "atmel,at91sam9rl-pmc", .data = &pmc_infos[3] },
990 	{ .compatible = "atmel,at91sam9x5-pmc", .data = &pmc_infos[1] },
991 	{ .compatible = "atmel,sama5d3-pmc", .data = &pmc_infos[1] },
992 	{ .compatible = "atmel,sama5d4-pmc", .data = &pmc_infos[1] },
993 	{ .compatible = "atmel,sama5d2-pmc", .data = &pmc_infos[1] },
994 	{ .compatible = "microchip,sam9x60-pmc", .data = &pmc_infos[4] },
995 	{ .compatible = "microchip,sama7g5-pmc", .data = &pmc_infos[5] },
1001 	u8 i, standby = 0, suspend = 0;  in at91_pm_modes_validate()  local
1002 	int mode;  in at91_pm_modes_validate()  local
1005 		if (standby && suspend)  in at91_pm_modes_validate()
1013 		if (modes[i] == soc_pm.data.suspend_mode && !suspend) {  in at91_pm_modes_validate()
1014 			suspend = 1;  in at91_pm_modes_validate()
1021 			mode = AT91_PM_ULP0;  in at91_pm_modes_validate()
1023 			mode = AT91_PM_STANDBY;  in at91_pm_modes_validate()
1025 		pr_warn("AT91: PM: %s mode not supported! Using %s.\n",  in at91_pm_modes_validate()
1027 			pm_modes[mode].pattern);  in at91_pm_modes_validate()
1028 		soc_pm.data.standby_mode = mode;  in at91_pm_modes_validate()
1031 	if (!suspend) {  in at91_pm_modes_validate()
1033 			mode = AT91_PM_STANDBY;  in at91_pm_modes_validate()
1035 			mode = AT91_PM_ULP0;  in at91_pm_modes_validate()
1037 		pr_warn("AT91: PM: %s mode not supported! Using %s.\n",  in at91_pm_modes_validate()
1039 			pm_modes[mode].pattern);  in at91_pm_modes_validate()
1040 		soc_pm.data.suspend_mode = mode;  in at91_pm_modes_validate()
1061 	pmc = of_id->data;  in at91_pm_init()
1062 	soc_pm.data.uhp_udp_mask = pmc->uhp_udp_mask;  in at91_pm_init()
1063 	soc_pm.data.pmc_mckr_offset = pmc->mckr;  in at91_pm_init()
1064 	soc_pm.data.pmc_version = pmc->version;  in at91_pm_init()
1073 		pr_info("AT91: PM: standby: %s, suspend: %s\n",  in at91_pm_init()
1089 	 * Force STANDBY and ULP0 mode to avoid calling  in at91rm9200_pm_init()
1101 	 * AT91RM9200 SDRAM low-power mode cannot be used with self-refresh.  in at91rm9200_pm_init()
1141 	 * Force STANDBY and ULP0 mode to avoid calling  in at91sam9_pm_init()
1246 	int standby, suspend;  in at91_pm_modes_select()  local
1256 	suspend = match_token(str, pm_modes, args);  in at91_pm_modes_select()
1257 	if (suspend < 0)  in at91_pm_modes_select()
1261 	soc_pm.data.suspend_mode = suspend;  in at91_pm_modes_select()