arm/mach-exynos/platsmp.c

1 // SPDX-License-Identifier: GPL-2.0
2 // Copyright (c) 2010-2011 Samsung Electronics Co., Ltd.
5 // Cloned from linux/arch/arm/mach-vexpress/platsmp.c
17 #include <linux/soc/samsung/exynos-regs-pmu.h>
29 /* XXX exynos_pen_release is cargo culted code - DO NOT COPY XXX */
30 volatile int exynos_pen_release = -1;
70 		 * having been woken up - this shouldn't happen  in platform_do_lowpower()
72 		 * Just note it happening - when we're woken, we can report  in platform_do_lowpower()
81  * exynos_cpu_power_down() - power down the specified cpu
82  * @cpu: the cpu to power down
84  * Power down the specified cpu. The sequence must be finished by a
93 		 * Bypass power down for CPU0 during suspend. Check for  in exynos_cpu_power_down()
109  * exynos_cpu_power_up() - power up the specified cpu
110  * @cpu: the cpu to power up
112  * Power up the specified cpu
126  * exynos_cpu_power_state() - returns the power state of the cpu
127  * @cpu: the cpu to retrieve the power state from
136  * exynos_cluster_power_down() - power down the specified cluster
137  * @cluster: the cluster to power down
145  * exynos_cluster_power_up() - power up the specified cluster
146  * @cluster: the cluster to power up
155  * exynos_cluster_power_state() - returns the power state of the cluster
156  * @cluster: the cluster to retrieve the power state from
166  * exynos_scu_enable() - enables SCU for Cortex-A9 based system
174 		np = of_find_compatible_node(NULL, NULL, "arm,cortex-a9-scu");  in exynos_scu_enable()
198 		return IOMEM_ERR_PTR(-ENODEV);  in cpu_boot_reg()
207  * Set wake up by local power mode and execute software reset for given core.
220 		timeout--;  in exynos_core_restart()
237  * XXX CARGO CULTED CODE - DO NOT COPY XXX
258 	exynos_write_pen_release(-1);  in exynos_secondary_init()
276 	if (ret && ret != -ENOSYS)  in exynos_set_boot_addr()
278 	if (ret == -ENOSYS) {  in exynos_set_boot_addr()
301 	if (ret && ret != -ENOSYS)  in exynos_get_boot_addr()
303 	if (ret == -ENOSYS) {  in exynos_get_boot_addr()
322 	int ret = -ENOSYS;  in exynos_boot_secondary()
332 	 * the holding pen - release it, then wait for it to flag  in exynos_boot_secondary()
349 			timeout--;  in exynos_boot_secondary()
354 			printk(KERN_ERR "cpu1 power enable failed");  in exynos_boot_secondary()
356 			return -ETIMEDOUT;  in exynos_boot_secondary()
387 		if (exynos_pen_release == -1)  in exynos_boot_secondary()
393 	if (exynos_pen_release != -1)  in exynos_boot_secondary()
394 		ret = -ETIMEDOUT;  in exynos_boot_secondary()
403 	return exynos_pen_release != -1 ? ret : 0;  in exynos_boot_secondary()
418  * platform-specific code to shutdown a CPU