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2a21f9e6d9
Add a debugfs option to allow configurable halting of the wkup_m3 during suspend at the last possible point before low power mode entry. This condition can only be resolved through JTAG and advancing beyond the while loop in a8_lp_ds0_handler [1]. Although this hangs the system it forces the system to remain active once it has been entirely configured for low power mode entry, allowing for register inspection through JTAG to help in debugging transition errors. Halt mode can be set using the enable_off_mode entry under wkup_m3_ipc in the debugfs. [1] https://git.ti.com/cgit/processor-firmware/ti-amx3-cm3-pm-firmware/tree/src/pm_services/pm_handlers.c?h=08.02.00.006#n141 Suggested-by: Brad Griffis <bgriffis@ti.com> Signed-off-by: Dave Gerlach <d-gerlach@ti.com> [dfustini: add link for a8_lp_ds0_handler() in ti-amx3-cm3-pm-firmware] Signed-off-by: Drew Fustini <dfustini@baylibre.com> Signed-off-by: Nishanth Menon <nm@ti.com> Link: https://lore.kernel.org/r/20220502033211.1383158-1-dfustini@baylibre.com
77 lines
2 KiB
C
77 lines
2 KiB
C
/*
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* TI Wakeup M3 for AMx3 SoCs Power Management Routines
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*
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* Copyright (C) 2015 Texas Instruments Incorporated - https://www.ti.com/
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* Dave Gerlach <d-gerlach@ti.com>
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License as
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* published by the Free Software Foundation version 2.
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*
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* This program is distributed "as is" WITHOUT ANY WARRANTY of any
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* kind, whether express or implied; without even the implied warranty
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* of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*/
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#ifndef _LINUX_WKUP_M3_IPC_H
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#define _LINUX_WKUP_M3_IPC_H
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#define WKUP_M3_DEEPSLEEP 1
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#define WKUP_M3_STANDBY 2
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#define WKUP_M3_IDLE 3
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#include <linux/mailbox_client.h>
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struct wkup_m3_ipc_ops;
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struct wkup_m3_ipc {
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struct rproc *rproc;
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void __iomem *ipc_mem_base;
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struct device *dev;
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int mem_type;
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unsigned long resume_addr;
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int vtt_conf;
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int isolation_conf;
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int state;
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u32 halt;
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unsigned long volt_scale_offsets;
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const char *sd_fw_name;
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struct completion sync_complete;
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struct mbox_client mbox_client;
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struct mbox_chan *mbox;
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struct wkup_m3_ipc_ops *ops;
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int is_rtc_only;
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struct dentry *dbg_path;
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};
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struct wkup_m3_wakeup_src {
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int irq_nr;
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char src[10];
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};
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struct wkup_m3_scale_data_header {
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u16 magic;
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u8 sleep_offset;
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u8 wake_offset;
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} __packed;
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struct wkup_m3_ipc_ops {
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void (*set_mem_type)(struct wkup_m3_ipc *m3_ipc, int mem_type);
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void (*set_resume_address)(struct wkup_m3_ipc *m3_ipc, void *addr);
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int (*prepare_low_power)(struct wkup_m3_ipc *m3_ipc, int state);
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int (*finish_low_power)(struct wkup_m3_ipc *m3_ipc);
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int (*request_pm_status)(struct wkup_m3_ipc *m3_ipc);
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const char *(*request_wake_src)(struct wkup_m3_ipc *m3_ipc);
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void (*set_rtc_only)(struct wkup_m3_ipc *m3_ipc);
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};
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struct wkup_m3_ipc *wkup_m3_ipc_get(void);
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void wkup_m3_ipc_put(struct wkup_m3_ipc *m3_ipc);
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void wkup_m3_set_rtc_only_mode(void);
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#endif /* _LINUX_WKUP_M3_IPC_H */
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