1 // SPDX-License-Identifier: GPL-2.0-or-later
3  * arch/arm/mach-at91/pm.c
35  * struct at91_pm_bu - AT91 power management backup unit data structure
52  * struct at91_pm_sfrbu_regs - registers mapping for SFRBU
65  * enum at91_pm_eth_clk - Ethernet clock indexes
77  * enum at91_pm_eth - Ethernet controller indexes
89  * struct at91_pm_quirk_eth - AT91 PM Ethernet quirks
107  * struct at91_pm_quirks - AT91 PM quirks
115  * struct at91_soc_pm - AT91 SoC power management data structure
137  * enum at91_pm_iomaps - IOs that needs to be mapped for different PM modes
160 	{ AT91_PM_ULP0_FAST,    "ulp0-fast" },
163 	{ -1, NULL },
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] },
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] },
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] },
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] },
255 		return -EPERM;  in at91_pm_config_ws()
274 		if (device_may_wakeup(&pdev->dev)) {  in at91_pm_config_ws()
275 			wsi = match->data;  in at91_pm_config_ws()
278 			if (wsi->shdwc_mr_bit && !(val & wsi->shdwc_mr_bit))  in at91_pm_config_ws()
281 			mode |= wsi->pmc_fsmr_bit;  in at91_pm_config_ws()
282 			if (wsi->set_polarity)  in at91_pm_config_ws()
283 				polarity |= wsi->pmc_fsmr_bit;  in at91_pm_config_ws()
287 		put_device(&pdev->dev);  in at91_pm_config_ws()
297 	return mode ? 0 : -EPERM;  in at91_pm_config_ws()
333 	if (!eth->np)  in at91_pm_eth_quirk_is_valid()
337 	if (!(eth->modes & BIT(soc_pm.data.mode)))  in at91_pm_eth_quirk_is_valid()
340 	if (!eth->dev) {  in at91_pm_eth_quirk_is_valid()
342 		pdev = of_find_device_by_node(eth->np);  in at91_pm_eth_quirk_is_valid()
345 		/* put_device(eth->dev) is called at the end of suspend. */  in at91_pm_eth_quirk_is_valid()
346 		eth->dev = &pdev->dev;  in at91_pm_eth_quirk_is_valid()
350 	if (!device_may_wakeup(eth->dev))  in at91_pm_eth_quirk_is_valid()
383 		if (suspend && eth->dns_modes & BIT(soc_pm.data.mode)) {  in at91_pm_config_quirks()
389 				if (ws->dev == eth->dev)  in at91_pm_config_quirks()
404 				ret = -EPERM;  in at91_pm_config_quirks()
405 				put_device(eth->dev);  in at91_pm_config_quirks()
406 				eth->dev = NULL;  in at91_pm_config_quirks()
408 				i--;  in at91_pm_config_quirks()
414 			clk_bulk_disable_unprepare(AT91_PM_ETH_MAX_CLK, eth->clks);  in at91_pm_config_quirks()
417 						      eth->clks);  in at91_pm_config_quirks()
421 			 * Release the reference to eth->dev taken in  in at91_pm_config_quirks()
424 			put_device(eth->dev);  in at91_pm_config_quirks()
425 			eth->dev = NULL;  in at91_pm_config_quirks()
437 	for (j = i; j >= 0; j--) {  in at91_pm_config_quirks()
443 			tmp = clk_bulk_prepare_enable(AT91_PM_ETH_MAX_CLK, eth->clks);  in at91_pm_config_quirks()
451 		 * Release the reference to eth->dev taken in  in at91_pm_config_quirks()
454 		put_device(eth->dev);  in at91_pm_config_quirks()
455 		eth->dev = NULL;  in at91_pm_config_quirks()
478 		soc_pm.data.mode = -1;  in at91_pm_begin()
486 		soc_pm.bu->suspended = 1;  in at91_pm_begin()
488 		soc_pm.bu->suspended = 0;  in at91_pm_begin()
495  * slow-clock mode.
506 		pr_err("AT91: PM - Suspend-to-RAM with USB still active\n");  in at91_pm_verify_clocks()
518 			pr_err("AT91: PM - Suspend-to-RAM with PCK%d src %d\n", i, css);  in at91_pm_verify_clocks()
534  * to add one generic API rather than lots of platform-specific ones.
567 		/* Store pull-down output impedance select. */  in at91_suspend_finish()
569 		soc_pm.bu->ddr_phy_calibration[0] = modified_gray_code[index];  in at91_suspend_finish()
571 		/* Store pull-up output impedance select. */  in at91_suspend_finish()
573 		soc_pm.bu->ddr_phy_calibration[0] |= modified_gray_code[index];  in at91_suspend_finish()
575 		/* Store pull-down on-die termination impedance select. */  in at91_suspend_finish()
577 		soc_pm.bu->ddr_phy_calibration[0] |= modified_gray_code[index];  in at91_suspend_finish()
579 		/* Store pull-up on-die termination impedance select. */  in at91_suspend_finish()
581 		soc_pm.bu->ddr_phy_calibration[0] |= modified_gray_code[index];  in at91_suspend_finish()
589 			soc_pm.bu->ddr_phy_calibration[i] =  in at91_suspend_finish()
590 				*((unsigned int *)soc_pm.memcs + (i - 1));  in at91_suspend_finish()
602  * at91_pm_switch_ba_to_auto() - Configure Backup Unit Power Switch
605  * The Backup Unit Power Switch can be managed either by software or hardware.
611  * required. If it is in software-controlled mode, it is switched to automatic
691 		pr_debug("AT91: PM - bogus suspend state %d\n", state);  in at91_pm_enter()
717 	.name = "cpuidle-at91",
721  * The AT91RM9200 goes into self-refresh mode with this command, and will
722  * terminate self-refresh automatically on the next SDRAM access.
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.
747 	/* Those two values allow us to delay self-refresh activation  in at91_ddr_standby()
753 	/* LPDDR1 --> force DDR2 mode during self-refresh */  in at91_ddr_standby()
777 	/* self-refresh mode now */  in at91_ddr_standby()
826 	/* self-refresh mode now */  in at91sam9_sdram_standby()
846 	 * Place RAM into self-refresh after a maximum idle clocks. The maximum  in sama7g5_standby()
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], },
885 	{ .compatible = "microchip,sama7g5-ddr3phy", },
902 			ret = -ENOMEM;  in at91_dt_ramc()
907 		ramc = of_id->data;  in at91_dt_ramc()
910 				standby = ramc->idle;  in at91_dt_ramc()
911 			soc_pm.data.memctrl = ramc->memctrl;  in at91_dt_ramc()
919 		ret = -ENODEV;  in at91_dt_ramc()
928 			ret = -ENOMEM;  in at91_dt_ramc()
936 		ret = -ENODEV;  in at91_dt_ramc()
951 		iounmap(soc_pm.data.ramc[--idx]);  in at91_dt_ramc()
960 	 * re-enabled by an interrupt or by a reset.  in at91rm9200_idle()
979 	for_each_compatible_node(node, NULL, "mmio-sram") {  in at91_pm_sram_init()
992 	sram_pool = gen_pool_get(&pdev->dev, NULL);  in at91_pm_sram_init()
1018 	put_device(&pdev->dev);  in at91_pm_sram_init()
1061 	int ret = -ENODEV, located = 0;  in at91_pm_backup_init()
1065 		return -EPERM;  in at91_pm_backup_init()
1070 	np = of_find_compatible_node(NULL, NULL, "atmel,sama5d2-securam");  in at91_pm_backup_init()
1081 	sram_pool = gen_pool_get(&pdev->dev, NULL);  in at91_pm_backup_init()
1090 		ret = -ENOMEM;  in at91_pm_backup_init()
1094 	soc_pm.bu->suspended = 0;  in at91_pm_backup_init()
1095 	soc_pm.bu->canary = __pa_symbol(&canary);  in at91_pm_backup_init()
1096 	soc_pm.bu->resume = __pa_symbol(cpu_resume);  in at91_pm_backup_init()
1106 	put_device(&pdev->dev);  in at91_pm_backup_init()
1132 		soc_pm.data.mode = -1;  in at91_pm_secure_init()
1143 	{ .compatible = "atmel,sama5d2-shdwc" },
1144 	{ .compatible = "microchip,sam9x60-shdwc" },
1145 	{ .compatible = "microchip,sama7g5-shdwc" },
1150 	{ .compatible = "atmel,sama5d3-gem" },
1151 	{ .compatible = "atmel,sama5d2-gem" },
1152 	{ .compatible = "atmel,sama5d29-gem" },
1153 	{ .compatible = "microchip,sama7g5-gem" },
1158 	{ .compatible = "atmel,sama5d3-macb" },
1159 	{ .compatible = "microchip,sama7g5-emac" },
1265 		np = of_find_compatible_node(NULL, NULL, "atmel,sama5d2-sfrbu");  in at91_pm_modes_init()
1288 			gmac->np = np;  in at91_pm_modes_init()
1289 			at91_pm_get_eth_clks(np, gmac->clks);  in at91_pm_modes_init()
1294 			if (at91_pm_eth_clks_empty(gmac->clks))  in at91_pm_modes_init()
1298 			emac->np = np;  in at91_pm_modes_init()
1299 			ret = at91_pm_get_eth_clks(np, emac->clks);  in at91_pm_modes_init()
1300 			if (ret && at91_pm_eth_clks_empty(gmac->clks)) {  in at91_pm_modes_init()
1301 				of_node_put(gmac->np);  in at91_pm_modes_init()
1302 				of_node_put(emac->np);  in at91_pm_modes_init()
1303 				gmac->np = NULL;  in at91_pm_modes_init()
1304 				emac->np = NULL;  in at91_pm_modes_init()
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] },
1447 	pmc = of_id->data;  in at91_pm_init()
1448 	soc_pm.data.uhp_udp_mask = pmc->uhp_udp_mask;  in at91_pm_init()
1449 	soc_pm.data.pmc_mckr_offset = pmc->mckr;  in at91_pm_init()
1450 	soc_pm.data.pmc_version = pmc->version;  in at91_pm_init()
1487 	 * AT91RM9200 SDRAM low-power mode cannot be used with self-refresh.  in at91rm9200_pm_init()