Orange Pi5 kernel

^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  1) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  2)  * based on arch/arm/mach-kirkwood/cpuidle.c
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  3)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  4)  * CPU idle support for AT91 SoC
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  5)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  6)  * This file is licensed under the terms of the GNU General Public
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  7)  * License version 2.  This program is licensed "as is" without any
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  8)  * warranty of any kind, whether express or implied.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  9)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 10)  * The cpu idle uses wait-for-interrupt and RAM self refresh in order
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 11)  * to implement two idle states -
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 12)  * #1 wait-for-interrupt
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 13)  * #2 wait-for-interrupt and RAM self refresh
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 14)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 15) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 16) #include <linux/kernel.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 17) #include <linux/init.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 18) #include <linux/platform_device.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 19) #include <linux/cpuidle.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 20) #include <linux/io.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 21) #include <linux/export.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 22) #include <asm/cpuidle.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 23) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 24) #define AT91_MAX_STATES	2
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 25) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 26) static void (*at91_standby)(void);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 27) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 28) /* Actual code that puts the SoC in different idle states */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 29) static int at91_enter_idle(struct cpuidle_device *dev,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 30) 			struct cpuidle_driver *drv,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 31) 			       int index)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 32) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 33) 	at91_standby();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 34) 	return index;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 35) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 36) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 37) static struct cpuidle_driver at91_idle_driver = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 38) 	.name			= "at91_idle",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 39) 	.owner			= THIS_MODULE,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 40) 	.states[0]		= ARM_CPUIDLE_WFI_STATE,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 41) 	.states[1]		= {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 42) 		.enter			= at91_enter_idle,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 43) 		.exit_latency		= 10,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 44) 		.target_residency	= 10000,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 45) 		.name			= "RAM_SR",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 46) 		.desc			= "WFI and DDR Self Refresh",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 47) 	},
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 48) 	.state_count = AT91_MAX_STATES,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 49) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 50) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 51) /* Initialize CPU idle by registering the idle states */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 52) static int at91_cpuidle_probe(struct platform_device *dev)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 53) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 54) 	at91_standby = (void *)(dev->dev.platform_data);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 55) 	
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 56) 	return cpuidle_register(&at91_idle_driver, NULL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 57) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 58) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 59) static struct platform_driver at91_cpuidle_driver = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 60) 	.driver = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 61) 		.name = "cpuidle-at91",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 62) 	},
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 63) 	.probe = at91_cpuidle_probe,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 64) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 65) builtin_platform_driver(at91_cpuidle_driver);