drivers/cpuidle/cpuidle-ux500.c

1 // SPDX-License-Identifier: GPL-2.0-only
5  * Based on the work of Rickard Andersson <rickard.andersson@stericsson.com>
14 #include <linux/mfd/dbx500-prcmu.h>
15 #include <linux/platform_data/arm-ux500-pm.h>
31 		/* With this lock, we prevent the other cpu to exit and enter  in ux500_enter_idle()
32 		 * this function again and become the master */  in ux500_enter_idle()
36 		/* decouple the gic from the A9 cores */  in ux500_enter_idle()
42 		/* If an error occur, we will have to recouple the gic  in ux500_enter_idle()
46 		/* At this state, as the gic is decoupled, if the other  in ux500_enter_idle()
47 		 * cpu is in WFI, we have the guarantee it won't be wake  in ux500_enter_idle()
48 		 * up, so we can safely go to retention */  in ux500_enter_idle()
52 		/* The prcmu will be in charge of watching the interrupts  in ux500_enter_idle()
53 		 * and wake up the cpus */  in ux500_enter_idle()
57 		/* Check in the meantime an interrupt did  in ux500_enter_idle()
58 		 * not occur on the gic ... */  in ux500_enter_idle()
62 		/* ... and the prcmu */  in ux500_enter_idle()
66 		/* Go to the retention state, the prcmu will wait for the  in ux500_enter_idle()
67 		 * cpu to go WFI and this is what happens after exiting this  in ux500_enter_idle()
72 		/* When we switch to retention, the prcmu is in charge  in ux500_enter_idle()
73 		 * of recoupling the gic automatically */  in ux500_enter_idle()
120 		.name = "db8500-cpuidle",