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f226041424
Some boards like the AM335x EVM-SK and AM437x GP EVM provide software control via a GPIO pin to toggle the DDR VTT regulator to reduce power consumption in low power states. The VTT regulator should be disabled after enabling self-refresh on suspend, and should be enabled before disabling self-refresh on resume. This is to allow proper self-refresh entry/exit commands to be transmitted to the memory. The "ti,vtt-gpio-pin" device tree property in the wkup_m3_ipc node specifies which GPIO pin to use. This property is communicated to the Wakeup Cortex M3 co-processor where the actual toggling of the GPIO pin happens in CM3 firmware [1]. Please note that the GPIO pin must be on the GPIO0 module as that module is in the wakeup power domain. [1] https://git.ti.com/cgit/processor-firmware/ti-amx3-cm3-pm-firmware/tree/src/pm_services/ddr.c?h=08.02.00.006#n190 Signed-off-by: Dave Gerlach <d-gerlach@ti.com> Signed-off-by: Keerthy <j-keerthy@ti.com> [dfustini: remove the unnecessary "ti,needs-vtt-toggle" property] Signed-off-by: Drew Fustini <dfustini@baylibre.com> Signed-off-by: Nishanth Menon <nm@ti.com> Link: https://lore.kernel.org/r/20220409211215.2529387-3-dfustini@baylibre.com
65 lines
1.8 KiB
C
65 lines
1.8 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 state;
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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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};
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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_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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