1 // SPDX-License-Identifier: GPL-2.0-or-later
3  * arch/arm/mach-at91/pm.c
15 #include <linux/suspend.h>
23 #include <asm/suspend.h>
32  * called as part of the generic suspend/resume path.
40 	int (*config_shdwc_ws)(void __iomem *shdwc, u32 *mode, u32 *polarity);
41 	int (*config_pmc_ws)(void __iomem *pmc, u32 mode, u32 polarity);
56 	{ AT91_PM_ULP0_FAST,    "ulp0-fast" },
59 	{ -1, NULL },
106 	{ .compatible = "atmel,sama5d2-gem",		.data = &ws_info[0] },
107 	{ .compatible = "atmel,at91rm9200-rtc",		.data = &ws_info[1] },
108 	{ .compatible = "atmel,sama5d3-udc",		.data = &ws_info[2] },
109 	{ .compatible = "atmel,at91rm9200-ohci",	.data = &ws_info[2] },
110 	{ .compatible = "usb-ohci",			.data = &ws_info[2] },
111 	{ .compatible = "atmel,at91sam9g45-ehci",	.data = &ws_info[2] },
112 	{ .compatible = "usb-ehci",			.data = &ws_info[2] },
113 	{ .compatible = "atmel,sama5d2-sdhci",		.data = &ws_info[3] },
118 	{ .compatible = "atmel,at91sam9x5-rtc",		.data = &ws_info[1] },
119 	{ .compatible = "atmel,at91rm9200-ohci",	.data = &ws_info[2] },
120 	{ .compatible = "usb-ohci",			.data = &ws_info[2] },
121 	{ .compatible = "atmel,at91sam9g45-ehci",	.data = &ws_info[2] },
122 	{ .compatible = "usb-ehci",			.data = &ws_info[2] },
123 	{ .compatible = "atmel,at91sam9260-rtt",	.data = &ws_info[4] },
124 	{ .compatible = "cdns,sam9x60-macb",		.data = &ws_info[5] },
134 	unsigned int mode = 0, polarity = 0, val = 0;  in at91_pm_config_ws()  local
140 		return -EPERM;  in at91_pm_config_ws()
143 		writel(mode, soc_pm.data.pmc + AT91_PMC_FSMR);  in at91_pm_config_ws()
148 		soc_pm.config_shdwc_ws(soc_pm.data.shdwc, &mode, &polarity);  in at91_pm_config_ws()
159 		if (device_may_wakeup(&pdev->dev)) {  in at91_pm_config_ws()
160 			wsi = match->data;  in at91_pm_config_ws()
163 			if (wsi->shdwc_mr_bit && !(val & wsi->shdwc_mr_bit))  in at91_pm_config_ws()
166 			mode |= wsi->pmc_fsmr_bit;  in at91_pm_config_ws()
167 			if (wsi->set_polarity)  in at91_pm_config_ws()
168 				polarity |= wsi->pmc_fsmr_bit;  in at91_pm_config_ws()
172 		put_device(&pdev->dev);  in at91_pm_config_ws()
175 	if (mode) {  in at91_pm_config_ws()
177 			soc_pm.config_pmc_ws(soc_pm.data.pmc, mode, polarity);  in at91_pm_config_ws()
182 	return mode ? 0 : -EPERM;  in at91_pm_config_ws()
185 static int at91_sama5d2_config_shdwc_ws(void __iomem *shdwc, u32 *mode,  in at91_sama5d2_config_shdwc_ws()  argument
192 	*mode |= (val & 0x3ff);  in at91_sama5d2_config_shdwc_ws()
198 static int at91_sama5d2_config_pmc_ws(void __iomem *pmc, u32 mode, u32 polarity)  in at91_sama5d2_config_pmc_ws()  argument
200 	writel(mode, pmc + AT91_PMC_FSMR);  in at91_sama5d2_config_pmc_ws()
206 static int at91_sam9x60_config_pmc_ws(void __iomem *pmc, u32 mode, u32 polarity)  in at91_sam9x60_config_pmc_ws()  argument
208 	writel(mode, pmc + AT91_PMC_FSMR);  in at91_sam9x60_config_pmc_ws()
220 		soc_pm.data.mode = soc_pm.data.suspend_mode;  in at91_pm_begin()
224 		soc_pm.data.mode = soc_pm.data.standby_mode;  in at91_pm_begin()
228 		soc_pm.data.mode = -1;  in at91_pm_begin()
231 	return at91_pm_config_ws(soc_pm.data.mode, true);  in at91_pm_begin()
236  * slow-clock mode.
247 		pr_err("AT91: PM - Suspend-to-RAM with USB still active\n");  in at91_pm_verify_clocks()
259 			pr_err("AT91: PM - Suspend-to-RAM with PCK%d src %d\n", i, css);  in at91_pm_verify_clocks()
268  * Call this from platform driver suspend() to see how deeply to suspend.
271  * going into slow clock mode.
275  * to add one generic API rather than lots of platform-specific ones.
279 	return (soc_pm.data.mode >= AT91_PM_ULP0);  in at91_suspend_entering_slow_clock()
299 	if (soc_pm.data.mode == AT91_PM_BACKUP) {  in at91_pm_suspend()
300 		pm_bu->suspended = 1;  in at91_pm_suspend()
304 		/* The SRAM is lost between suspend cycles */  in at91_pm_suspend()
316  * STANDBY mode has *all* drivers suspended; ignores irqs not marked as 'wakeup'
320  * AT91_PM_ULP0 is like STANDBY plus slow clock mode, so drivers must
321  * suspend more deeply, the master clock switches to the clk32k and turns off
338 		if (soc_pm.data.mode >= AT91_PM_ULP0 &&  in at91_pm_enter()
351 		pr_debug("AT91: PM - bogus suspend state %d\n", state);  in at91_pm_enter()
367 	at91_pm_config_ws(soc_pm.data.mode, false);  in at91_pm_end()
379 	.name = "cpuidle-at91",
383  * The AT91RM9200 goes into self-refresh mode with this command, and will
384  * terminate self-refresh automatically on the next SDRAM access.
386  * Self-refresh mode is exited as soon as a memory access is made, but we don't
387  * know for sure when that happens. However, we need to restore the low-power
388  * mode if it was enabled before going idle. Restoring low-power mode while
389  * still in self-refresh is "not recommended", but seems to work.
409 	/* Those two values allow us to delay self-refresh activation  in at91_ddr_standby()
415 	/* LPDDR1 --> force DDR2 mode during self-refresh */  in at91_ddr_standby()
439 	/* self-refresh mode now */  in at91_ddr_standby()
488 	/* self-refresh mode now */  in at91sam9_sdram_standby()
513 	{ .compatible = "atmel,at91rm9200-sdramc", .data = &ramc_infos[0] },
514 	{ .compatible = "atmel,at91sam9260-sdramc", .data = &ramc_infos[1] },
515 	{ .compatible = "atmel,at91sam9g45-ddramc", .data = &ramc_infos[2] },
516 	{ .compatible = "atmel,sama5d3-ddramc", .data = &ramc_infos[3] },
533 		ramc = of_id->data;  in at91_dt_ramc()
535 			standby = ramc->idle;  in at91_dt_ramc()
536 		soc_pm.data.memctrl = ramc->memctrl;  in at91_dt_ramc()
556 	 * re-enabled by an interrupt or by a reset.  in at91rm9200_idle()
575 	for_each_compatible_node(node, NULL, "mmio-sram") {  in at91_pm_sram_init()
588 	sram_pool = gen_pool_get(&pdev->dev, NULL);  in at91_pm_sram_init()
608 	/* Copy the pm suspend handler to SRAM */  in at91_pm_sram_init()
614 	put_device(&pdev->dev);  in at91_pm_sram_init()
629 	int ret = -ENODEV;  in at91_pm_backup_init()
632 		return -EPERM;  in at91_pm_backup_init()
637 	np = of_find_compatible_node(NULL, NULL, "atmel,sama5d2-sfrbu");  in at91_pm_backup_init()
646 	np = of_find_compatible_node(NULL, NULL, "atmel,sama5d2-securam");  in at91_pm_backup_init()
657 	sram_pool = gen_pool_get(&pdev->dev, NULL);  in at91_pm_backup_init()
666 		ret = -ENOMEM;  in at91_pm_backup_init()
670 	pm_bu->suspended = 0;  in at91_pm_backup_init()
671 	pm_bu->canary = __pa_symbol(&canary);  in at91_pm_backup_init()
672 	pm_bu->resume = __pa_symbol(cpu_resume);  in at91_pm_backup_init()
677 	put_device(&pdev->dev);  in at91_pm_backup_init()
696 	{ .compatible = "atmel,sama5d2-shdwc" },
697 	{ .compatible = "microchip,sam9x60-shdwc" },
773 	{ .compatible = "atmel,at91rm9200-pmc", .data = &pmc_infos[0] },
774 	{ .compatible = "atmel,at91sam9260-pmc", .data = &pmc_infos[1] },
775 	{ .compatible = "atmel,at91sam9261-pmc", .data = &pmc_infos[1] },
776 	{ .compatible = "atmel,at91sam9263-pmc", .data = &pmc_infos[1] },
777 	{ .compatible = "atmel,at91sam9g45-pmc", .data = &pmc_infos[2] },
778 	{ .compatible = "atmel,at91sam9n12-pmc", .data = &pmc_infos[1] },
779 	{ .compatible = "atmel,at91sam9rl-pmc", .data = &pmc_infos[3] },
780 	{ .compatible = "atmel,at91sam9x5-pmc", .data = &pmc_infos[1] },
781 	{ .compatible = "atmel,sama5d3-pmc", .data = &pmc_infos[1] },
782 	{ .compatible = "atmel,sama5d4-pmc", .data = &pmc_infos[1] },
783 	{ .compatible = "atmel,sama5d2-pmc", .data = &pmc_infos[1] },
784 	{ .compatible = "microchip,sam9x60-pmc", .data = &pmc_infos[4] },
790 	u8 i, standby = 0, suspend = 0;  in at91_pm_modes_validate()  local
791 	int mode;  in at91_pm_modes_validate()  local
794 		if (standby && suspend)  in at91_pm_modes_validate()
802 		if (modes[i] == soc_pm.data.suspend_mode && !suspend) {  in at91_pm_modes_validate()
803 			suspend = 1;  in at91_pm_modes_validate()
810 			mode = AT91_PM_ULP0;  in at91_pm_modes_validate()
812 			mode = AT91_PM_STANDBY;  in at91_pm_modes_validate()
814 		pr_warn("AT91: PM: %s mode not supported! Using %s.\n",  in at91_pm_modes_validate()
816 			pm_modes[mode].pattern);  in at91_pm_modes_validate()
817 		soc_pm.data.standby_mode = mode;  in at91_pm_modes_validate()
820 	if (!suspend) {  in at91_pm_modes_validate()
822 			mode = AT91_PM_STANDBY;  in at91_pm_modes_validate()
824 			mode = AT91_PM_ULP0;  in at91_pm_modes_validate()
826 		pr_warn("AT91: PM: %s mode not supported! Using %s.\n",  in at91_pm_modes_validate()
828 			pm_modes[mode].pattern);  in at91_pm_modes_validate()
829 		soc_pm.data.suspend_mode = mode;  in at91_pm_modes_validate()
850 	pmc = of_id->data;  in at91_pm_init()
851 	soc_pm.data.uhp_udp_mask = pmc->uhp_udp_mask;  in at91_pm_init()
852 	soc_pm.data.pmc_mckr_offset = pmc->mckr;  in at91_pm_init()
853 	soc_pm.data.pmc_version = pmc->version;  in at91_pm_init()
862 		pr_info("AT91: PM: standby: %s, suspend: %s\n",  in at91_pm_init()
876 	 * Force STANDBY and ULP0 mode to avoid calling  in at91rm9200_pm_init()
886 	 * AT91RM9200 SDRAM low-power mode cannot be used with self-refresh.  in at91rm9200_pm_init()
917 	 * Force STANDBY and ULP0 mode to avoid calling  in at91sam9_pm_init()
966 	int standby, suspend;  in at91_pm_modes_select()  local
976 	suspend = match_token(str, pm_modes, args);  in at91_pm_modes_select()
977 	if (suspend < 0)  in at91_pm_modes_select()
981 	soc_pm.data.suspend_mode = suspend;  in at91_pm_modes_select()