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soc: ti: Add wkup_m3_ipc driver

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Introduce a wkup_m3_ipc driver to handle communication between the MPU
and Cortex M3 wkup_m3 present on am335x.

This driver is responsible for actually booting the wkup_m3_rproc and
also handling all IPC which is done using the IPC registers in the control
module, a mailbox, and a separate interrupt back from the wkup_m3. A small
API is exposed for executing specific power commands, which include
configuring for low power mode, request a transition to a low power mode,
and status info on a previous transition.

Signed-off-by: Dave Gerlach <d-gerlach@ti.com>
Signed-off-by: Tony Lindgren <tony@atomide.com>
This commit is contained in:
Dave Gerlach
2015-09-22 19:14:54 -05:00
committed by Tony Lindgren
parent fe9b867d24
commit cdd5de500b
4 changed files with 574 additions and 0 deletions
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55
include/linux/wkup_m3_ipc.h Normal file
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/*
* TI Wakeup M3 for AMx3 SoCs Power Management Routines
*
* Copyright (C) 2015 Texas Instruments Incorporated - http://www.ti.com/
* Dave Gerlach <d-gerlach@ti.com>
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License as
* published by the Free Software Foundation version 2.
*
* This program is distributed "as is" WITHOUT ANY WARRANTY of any
* kind, whether express or implied; without even the implied warranty
* of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*/
#ifndef _LINUX_WKUP_M3_IPC_H
#define _LINUX_WKUP_M3_IPC_H
#define WKUP_M3_DEEPSLEEP 1
#define WKUP_M3_STANDBY 2
#define WKUP_M3_IDLE 3
#include <linux/mailbox_client.h>
struct wkup_m3_ipc_ops;
struct wkup_m3_ipc {
struct rproc *rproc;
void __iomem *ipc_mem_base;
struct device *dev;
int mem_type;
unsigned long resume_addr;
int state;
struct completion sync_complete;
struct mbox_client mbox_client;
struct mbox_chan *mbox;
struct wkup_m3_ipc_ops *ops;
};
struct wkup_m3_ipc_ops {
void (*set_mem_type)(struct wkup_m3_ipc *m3_ipc, int mem_type);
void (*set_resume_address)(struct wkup_m3_ipc *m3_ipc, void *addr);
int (*prepare_low_power)(struct wkup_m3_ipc *m3_ipc, int state);
int (*finish_low_power)(struct wkup_m3_ipc *m3_ipc);
int (*request_pm_status)(struct wkup_m3_ipc *m3_ipc);
};
struct wkup_m3_ipc *wkup_m3_ipc_get(void);
void wkup_m3_ipc_put(struct wkup_m3_ipc *m3_ipc);
#endif /* _LINUX_WKUP_M3_IPC_H */