1 // SPDX-License-Identifier: GPL-2.0-only
4  * Copyright:	(C) 2012-2013  Linaro Limited
17 #include <linux/irqchip/arm-gic.h>
20 #include <asm/proc-fns.h>
25 #include <linux/arm-cci.h>
31 #define RESET_A15_NCORERESET(cpu)	(1 << (2 + (cpu)))  argument
32 #define RESET_A7_NCORERESET(cpu)	(1 << (16 + (cpu)))  argument
46 static int tc2_pm_cpu_powerup(unsigned int cpu, unsigned int cluster)  in tc2_pm_cpu_powerup()  argument
48 	pr_debug("%s: cpu %u cluster %u\n", __func__, cpu, cluster);  in tc2_pm_cpu_powerup()
49 	if (cluster >= TC2_CLUSTERS || cpu >= tc2_nr_cpus[cluster])  in tc2_pm_cpu_powerup()
50 		return -EINVAL;  in tc2_pm_cpu_powerup()
51 	ve_spc_set_resume_addr(cluster, cpu,  in tc2_pm_cpu_powerup()
53 	ve_spc_cpu_wakeup_irq(cluster, cpu, true);  in tc2_pm_cpu_powerup()
61 		return -EINVAL;  in tc2_pm_cluster_powerup()
66 static void tc2_pm_cpu_powerdown_prepare(unsigned int cpu, unsigned int cluster)  in tc2_pm_cpu_powerdown_prepare()  argument
68 	pr_debug("%s: cpu %u cluster %u\n", __func__, cpu, cluster);  in tc2_pm_cpu_powerdown_prepare()
69 	BUG_ON(cluster >= TC2_CLUSTERS || cpu >= TC2_MAX_CPUS_PER_CLUSTER);  in tc2_pm_cpu_powerdown_prepare()
70 	ve_spc_cpu_wakeup_irq(cluster, cpu, true);  in tc2_pm_cpu_powerdown_prepare()
72 	 * If the CPU is committed to power down, make sure  in tc2_pm_cpu_powerdown_prepare()
73 	 * the power controller will be in charge of waking it  in tc2_pm_cpu_powerdown_prepare()
74 	 * up upon IRQ, ie IRQ lines are cut from GIC CPU IF  in tc2_pm_cpu_powerdown_prepare()
75 	 * to the CPU by disabling the GIC CPU IF to prevent wfi  in tc2_pm_cpu_powerdown_prepare()
76 	 * from completing execution behind power controller back  in tc2_pm_cpu_powerdown_prepare()
98 		 * On the Cortex-A15 we need to disable  in tc2_pm_cluster_cache_disable()
112 static int tc2_core_in_reset(unsigned int cpu, unsigned int cluster)  in tc2_core_in_reset()  argument
115 		  RESET_A7_NCORERESET(cpu)  in tc2_core_in_reset()
116 		: RESET_A15_NCORERESET(cpu);  in tc2_core_in_reset()
124 static int tc2_pm_wait_for_powerdown(unsigned int cpu, unsigned int cluster)  in tc2_pm_wait_for_powerdown()  argument
128 	pr_debug("%s: cpu %u cluster %u\n", __func__, cpu, cluster);  in tc2_pm_wait_for_powerdown()
129 	BUG_ON(cluster >= TC2_CLUSTERS || cpu >= TC2_MAX_CPUS_PER_CLUSTER);  in tc2_pm_wait_for_powerdown()
132 		pr_debug("%s(cpu=%u, cluster=%u): RESET_CTRL = 0x%08X\n",  in tc2_pm_wait_for_powerdown()
133 			 __func__, cpu, cluster,  in tc2_pm_wait_for_powerdown()
137 		 * We need the CPU to reach WFI, but the power  in tc2_pm_wait_for_powerdown()
138 		 * controller may put the cluster in reset and  in tc2_pm_wait_for_powerdown()
139 		 * power it off as soon as that happens, before  in tc2_pm_wait_for_powerdown()
144 		if (tc2_core_in_reset(cpu, cluster) ||  in tc2_pm_wait_for_powerdown()
145 		    ve_spc_cpu_in_wfi(cpu, cluster))  in tc2_pm_wait_for_powerdown()
146 			return 0; /* success: the CPU is halted */  in tc2_pm_wait_for_powerdown()
152 	return -ETIMEDOUT; /* timeout */  in tc2_pm_wait_for_powerdown()
155 static void tc2_pm_cpu_suspend_prepare(unsigned int cpu, unsigned int cluster)  in tc2_pm_cpu_suspend_prepare()  argument
157 	ve_spc_set_resume_addr(cluster, cpu, __pa_symbol(mcpm_entry_point));  in tc2_pm_cpu_suspend_prepare()
160 static void tc2_pm_cpu_is_up(unsigned int cpu, unsigned int cluster)  in tc2_pm_cpu_is_up()  argument
162 	pr_debug("%s: cpu %u cluster %u\n", __func__, cpu, cluster);  in tc2_pm_cpu_is_up()
163 	BUG_ON(cluster >= TC2_CLUSTERS || cpu >= TC2_MAX_CPUS_PER_CLUSTER);  in tc2_pm_cpu_is_up()
164 	ve_spc_cpu_wakeup_irq(cluster, cpu, false);  in tc2_pm_cpu_is_up()
165 	ve_spc_set_resume_addr(cluster, cpu, 0);  in tc2_pm_cpu_is_up()
190  * Enable cluster-level coherency, in preparation for turning on the MMU.
202 	unsigned int mpidr, cpu, cluster;  in tc2_pm_init()  local
208 	 * The power management-related features are hidden behind  in tc2_pm_init()
213 			"arm,vexpress-scc,v2p-ca15_a7");  in tc2_pm_init()
216 		return -ENODEV;  in tc2_pm_init()
221 		return -EINVAL;  in tc2_pm_init()
231 	 * with the SPC (power controller). We need to be able to  in tc2_pm_init()
232 	 * drive it very early in the boot process to power up  in tc2_pm_init()
240 		return -ENODEV;  in tc2_pm_init()
243 	cpu = MPIDR_AFFINITY_LEVEL(mpidr, 0);  in tc2_pm_init()
245 	pr_debug("%s: cpu %u cluster %u\n", __func__, cpu, cluster);  in tc2_pm_init()
246 	if (cluster >= TC2_CLUSTERS || cpu >= tc2_nr_cpus[cluster]) {  in tc2_pm_init()
247 		pr_err("%s: boot CPU is out of bound!\n", __func__);  in tc2_pm_init()
248 		return -EINVAL;  in tc2_pm_init()
256 		pr_info("TC2 power management initialized\n");  in tc2_pm_init()