1 // SPDX-License-Identifier: GPL-2.0
3  * AM33XX Power Management Routines
5  * Copyright (C) 2012-2018 Texas Instruments Incorporated - http://www.ti.com/
17 #include <linux/nvmem-consumer.h>
24 #include <linux/rtc/rtc-omap.h>
28 #include <linux/ti-emif-sram.h>
31 #include <asm/proc-fns.h>
35 #define AMX3_PM_SRAM_SYMBOL_OFFSET(sym) ((unsigned long)(sym) - \
36 					 (unsigned long)pm_sram->do_wfi)
104 					    pm_sram->do_wfi,  in am33xx_push_sram_idle()
105 					    *pm_sram->do_wfi_sz);  in am33xx_push_sram_idle()
110 		return -ENODEV;  in am33xx_push_sram_idle()
114 		sram_suspend_address((unsigned long)pm_sram->emif_sram_table);  in am33xx_push_sram_idle()
119 		return -EPROBE_DEFER;  in am33xx_push_sram_idle()
123 		sram_suspend_address((unsigned long)pm_sram->ro_sram_data);  in am33xx_push_sram_idle()
131 		return -ENODEV;  in am33xx_push_sram_idle()
143 		m3_ipc->ops->prepare_low_power(m3_ipc, WKUP_M3_IDLE);  in am33xx_do_sram_idle()
145 	return pm_ops->cpu_suspend(am33xx_do_wfi_sram, wfi_flags);  in am33xx_do_sram_idle()
153 		return -ENOMEM;  in am43xx_map_gic()
177 	omap_rtc_power_off_program(&omap_rtc->dev);  in am33xx_rtc_only_idle()
183  * Note that the RTC module clock must be re-enabled only for rtc+ddr suspend.
193 	    pm_ops->check_off_mode_enable()) {  in am33xx_pm_suspend()
200 		pm_ops->save_context();  in am33xx_pm_suspend()
203 		ret = pm_ops->soc_suspend(suspend_state, am33xx_rtc_only_idle,  in am33xx_pm_suspend()
207 		dev_info(pm33xx_dev, "Entering RTC Only mode with DDR in self-refresh\n");  in am33xx_pm_suspend()
211 			pm_ops->restore_context();  in am33xx_pm_suspend()
212 			m3_ipc->ops->set_rtc_only(m3_ipc);  in am33xx_pm_suspend()
216 		ret = pm_ops->soc_suspend(suspend_state, am33xx_do_wfi_sram,  in am33xx_pm_suspend()
223 		i = m3_ipc->ops->request_pm_status(m3_ipc);  in am33xx_pm_suspend()
233 			ret = -1;  in am33xx_pm_suspend()
238 			ret = -1;  in am33xx_pm_suspend()
244 			pr_info("PM: Wakeup source %s\n", wakeup_src.src);  in am33xx_pm_suspend()
246 			pr_info("PM: Wakeup source %s\n",  in am33xx_pm_suspend()
247 				m3_ipc->ops->request_wake_src(m3_ipc));  in am33xx_pm_suspend()
251 	if (suspend_state == PM_SUSPEND_MEM && pm_ops->check_off_mode_enable())  in am33xx_pm_suspend()
267 		ret = -EINVAL;  in am33xx_pm_enter()
275 	int ret = -EINVAL;  in am33xx_pm_begin()
278 	if (state == PM_SUSPEND_MEM && pm_ops->check_off_mode_enable()) {  in am33xx_pm_begin()
279 		nvmem = devm_nvmem_device_get(&omap_rtc->dev,  in am33xx_pm_begin()
289 	pm_ops->begin_suspend();  in am33xx_pm_begin()
293 		ret = m3_ipc->ops->prepare_low_power(m3_ipc, WKUP_M3_DEEPSLEEP);  in am33xx_pm_begin()
296 		ret = m3_ipc->ops->prepare_low_power(m3_ipc, WKUP_M3_STANDBY);  in am33xx_pm_begin()
308 	nvmem = devm_nvmem_device_get(&omap_rtc->dev, "omap_rtc_scratch0");  in am33xx_pm_end()
312 	m3_ipc->ops->finish_low_power(m3_ipc);  in am33xx_pm_end()
316 			 * 32 bits of Interrupt Set-Pending correspond to 32  in am33xx_pm_end()
333 	pm_ops->finish_suspend();  in am33xx_pm_end()
365 	m3_ipc->ops->set_mem_type(m3_ipc, temp);  in am33xx_pm_set_ipc_ops()
369 			 *pm_sram->resume_offset + 0x4;  in am33xx_pm_set_ipc_ops()
371 	m3_ipc->ops->set_resume_address(m3_ipc, (void *)resume_address);  in am33xx_pm_set_ipc_ops()
376 	gen_pool_free(sram_pool, ocmcram_location, *pm_sram->do_wfi_sz);  in am33xx_pm_free_sram()
382  * Push the minimal suspend-resume code to SRAM
389 	np = of_find_compatible_node(NULL, NULL, "ti,omap3-mpu");  in am33xx_pm_alloc_sram()
391 		np = of_find_compatible_node(NULL, NULL, "ti,omap4-mpu");  in am33xx_pm_alloc_sram()
395 			return -ENODEV;  in am33xx_pm_alloc_sram()
399 	sram_pool = of_gen_pool_get(np, "pm-sram", 0);  in am33xx_pm_alloc_sram()
403 		ret = -ENODEV;  in am33xx_pm_alloc_sram()
407 	sram_pool_data = of_gen_pool_get(np, "pm-sram", 1);  in am33xx_pm_alloc_sram()
411 		ret = -ENODEV;  in am33xx_pm_alloc_sram()
415 	ocmcram_location = gen_pool_alloc(sram_pool, *pm_sram->do_wfi_sz);  in am33xx_pm_alloc_sram()
419 		ret = -ENOMEM;  in am33xx_pm_alloc_sram()
427 		gen_pool_free(sram_pool, ocmcram_location, *pm_sram->do_wfi_sz);  in am33xx_pm_alloc_sram()
428 		ret = -ENOMEM;  in am33xx_pm_alloc_sram()
447 		rtc_fck = of_clk_get_by_name(np->parent, "fck");  in am33xx_pm_rtc_setup()
454 			error = -ENODEV;  in am33xx_pm_rtc_setup()
461 			error = -EPROBE_DEFER;  in am33xx_pm_rtc_setup()
465 		nvmem = devm_nvmem_device_get(&omap_rtc->dev,  in am33xx_pm_rtc_setup()
471 				pr_warn("PM: bootloader does not support rtc-only!\n");  in am33xx_pm_rtc_setup()
475 			val = pm_sram->resume_address;  in am33xx_pm_rtc_setup()
480 		pr_warn("PM: no-rtc available, rtc-only mode disabled.\n");  in am33xx_pm_rtc_setup()
495 	struct device *dev = &pdev->dev;  in am33xx_pm_probe()
500 		return -ENODEV;  in am33xx_pm_probe()
502 	pm_ops = dev->platform_data;  in am33xx_pm_probe()
505 		return -ENODEV;  in am33xx_pm_probe()
514 	pm_sram = pm_ops->get_sram_addrs();  in am33xx_pm_probe()
517 		return -ENODEV;  in am33xx_pm_probe()
523 		return -EPROBE_DEFER;  in am33xx_pm_probe()
547 	 * the DDR in self-refresh, we want to save the context  in am33xx_pm_probe()
548 	 * of the EMIF, and we want the wkup_m3 to handle low-power  in am33xx_pm_probe()
562 	ret = pm_ops->init(am33xx_do_sram_idle);  in am33xx_pm_probe()
565 		ret = -ENODEV;  in am33xx_pm_probe()
588 	pm_runtime_put_sync(&pdev->dev);  in am33xx_pm_remove()
589 	pm_runtime_disable(&pdev->dev);  in am33xx_pm_remove()
590 	if (pm_ops->deinit)  in am33xx_pm_remove()
591 		pm_ops->deinit();  in am33xx_pm_remove()
611 MODULE_DESCRIPTION("am33xx power management driver");