^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2) * PXA250/210 Power Management Routines
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4) * Original code for the SA11x0:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 5) * Copyright (c) 2001 Cliff Brake <cbrake@accelent.com>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 6) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 7) * Modified for the PXA250 by Nicolas Pitre:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 8) * Copyright (c) 2002 Monta Vista Software, Inc.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 9) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 10) * This program is free software; you can redistribute it and/or
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 11) * modify it under the terms of the GNU General Public License.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 12) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 13) #include <linux/init.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 14) #include <linux/module.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 15) #include <linux/suspend.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 16) #include <linux/errno.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 17) #include <linux/slab.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 18)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 19) #include "pm.h"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 20)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 21) struct pxa_cpu_pm_fns *pxa_cpu_pm_fns;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 22) static unsigned long *sleep_save;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 23)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 24) int pxa_pm_enter(suspend_state_t state)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 25) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 26) unsigned long sleep_save_checksum = 0, checksum = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 27) int i;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 28)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 29) #ifdef CONFIG_IWMMXT
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 30) /* force any iWMMXt context to ram **/
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 31) if (elf_hwcap & HWCAP_IWMMXT)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 32) iwmmxt_task_disable(NULL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 33) #endif
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 34)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 35) /* skip registers saving for standby */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 36) if (state != PM_SUSPEND_STANDBY && pxa_cpu_pm_fns->save) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 37) pxa_cpu_pm_fns->save(sleep_save);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 38) /* before sleeping, calculate and save a checksum */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 39) for (i = 0; i < pxa_cpu_pm_fns->save_count - 1; i++)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 40) sleep_save_checksum += sleep_save[i];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 41) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 42)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 43) /* *** go zzz *** */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 44) pxa_cpu_pm_fns->enter(state);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 45)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 46) if (state != PM_SUSPEND_STANDBY && pxa_cpu_pm_fns->restore) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 47) /* after sleeping, validate the checksum */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 48) for (i = 0; i < pxa_cpu_pm_fns->save_count - 1; i++)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 49) checksum += sleep_save[i];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 50)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 51) /* if invalid, display message and wait for a hardware reset */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 52) if (checksum != sleep_save_checksum) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 53)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 54) lubbock_set_hexled(0xbadbadc5);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 55)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 56) while (1)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 57) pxa_cpu_pm_fns->enter(state);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 58) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 59) pxa_cpu_pm_fns->restore(sleep_save);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 60) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 61)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 62) pr_debug("*** made it back from resume\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 63)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 64) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 65) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 66)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 67) EXPORT_SYMBOL_GPL(pxa_pm_enter);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 68)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 69) static int pxa_pm_valid(suspend_state_t state)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 70) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 71) if (pxa_cpu_pm_fns)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 72) return pxa_cpu_pm_fns->valid(state);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 73)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 74) return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 75) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 76)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 77) int pxa_pm_prepare(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 78) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 79) int ret = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 80)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 81) if (pxa_cpu_pm_fns && pxa_cpu_pm_fns->prepare)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 82) ret = pxa_cpu_pm_fns->prepare();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 83)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 84) return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 85) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 86)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 87) void pxa_pm_finish(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 88) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 89) if (pxa_cpu_pm_fns && pxa_cpu_pm_fns->finish)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 90) pxa_cpu_pm_fns->finish();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 91) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 92)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 93) static const struct platform_suspend_ops pxa_pm_ops = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 94) .valid = pxa_pm_valid,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 95) .enter = pxa_pm_enter,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 96) .prepare = pxa_pm_prepare,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 97) .finish = pxa_pm_finish,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 98) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 99)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 100) static int __init pxa_pm_init(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 101) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 102) if (!pxa_cpu_pm_fns) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 103) printk(KERN_ERR "no valid pxa_cpu_pm_fns defined\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 104) return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 105) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 106)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 107) sleep_save = kmalloc_array(pxa_cpu_pm_fns->save_count,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 108) sizeof(*sleep_save),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 109) GFP_KERNEL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 110) if (!sleep_save)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 111) return -ENOMEM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 112)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 113) suspend_set_ops(&pxa_pm_ops);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 114) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 115) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 116)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 117) device_initcall(pxa_pm_init);
Orange Pi5 kernel
Deprecated Linux kernel 5.10.110 for OrangePi 5/5B/5+ boards
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