arch/powerpc/include/asm/rtas.h

#ifndef _POWERPC_RTAS_H
#define _POWERPC_RTAS_H
#ifdef __KERNEL__

#include <linux/spinlock.h>
#include <asm/page.h>

/*
 * Definitions for talking to the RTAS on CHRP machines.
 *
 * Copyright (C) 2001 Peter Bergner
 * Copyright (C) 2001 PPC 64 Team, IBM Corp
 *
 * 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; either version
 * 2 of the License, or (at your option) any later version.
 */

#define RTAS_UNKNOWN_SERVICE (-1)
#define RTAS_INSTANTIATE_MAX (1ULL<<30) /* Don't instantiate rtas at/above this value */

/* Buffer size for ppc_rtas system call. */
#define RTAS_RMOBUF_MAX (64 * 1024)

/* RTAS return status codes */
#define RTAS_NOT_SUSPENDABLE	-9004
#define RTAS_BUSY		-2    /* RTAS Busy */
#define RTAS_EXTENDED_DELAY_MIN	9900
#define RTAS_EXTENDED_DELAY_MAX	9905

/*
 * In general to call RTAS use rtas_token("string") to lookup
 * an RTAS token for the given string (e.g. "event-scan").
 * To actually perform the call use
 *    ret = rtas_call(token, n_in, n_out, ...)
 * Where n_in is the number of input parameters and
 *       n_out is the number of output parameters
 *
 * If the "string" is invalid on this system, RTAS_UNKNOWN_SERVICE
 * will be returned as a token.  rtas_call() does look for this
 * token and error out gracefully so rtas_call(rtas_token("str"), ...)
 * may be safely used for one-shot calls to RTAS.
 *
 */

typedef u32 rtas_arg_t;

struct rtas_args {
	u32 token;
	u32 nargs;
	u32 nret; 
	rtas_arg_t args[16];
	rtas_arg_t *rets;     /* Pointer to return values in args[]. */
};  

struct rtas_t {
	unsigned long entry;		/* physical address pointer */
	unsigned long base;		/* physical address pointer */
	unsigned long size;
	spinlock_t lock;
	struct rtas_args args;
	struct device_node *dev;	/* virtual address pointer */
};

/* RTAS event classes */
#define RTAS_INTERNAL_ERROR		0x80000000 /* set bit 0 */
#define RTAS_EPOW_WARNING		0x40000000 /* set bit 1 */
#define RTAS_POWERMGM_EVENTS		0x20000000 /* set bit 2 */
#define RTAS_HOTPLUG_EVENTS		0x10000000 /* set bit 3 */
#define RTAS_EVENT_SCAN_ALL_EVENTS	0xf0000000

/* RTAS event severity */
#define RTAS_SEVERITY_FATAL		0x5
#define RTAS_SEVERITY_ERROR		0x4
#define RTAS_SEVERITY_ERROR_SYNC	0x3
#define RTAS_SEVERITY_WARNING		0x2
#define RTAS_SEVERITY_EVENT		0x1
#define RTAS_SEVERITY_NO_ERROR		0x0

/* RTAS event disposition */
#define RTAS_DISP_FULLY_RECOVERED	0x0
#define RTAS_DISP_LIMITED_RECOVERY	0x1
#define RTAS_DISP_NOT_RECOVERED		0x2

/* RTAS event initiator */
#define RTAS_INITIATOR_UNKNOWN		0x0
#define RTAS_INITIATOR_CPU		0x1
#define RTAS_INITIATOR_PCI		0x2
#define RTAS_INITIATOR_ISA		0x3
#define RTAS_INITIATOR_MEMORY		0x4
#define RTAS_INITIATOR_POWERMGM		0x5

/* RTAS event target */
#define RTAS_TARGET_UNKNOWN		0x0
#define RTAS_TARGET_CPU			0x1
#define RTAS_TARGET_PCI			0x2
#define RTAS_TARGET_ISA			0x3
#define RTAS_TARGET_MEMORY		0x4
#define RTAS_TARGET_POWERMGM		0x5

/* RTAS event type */
#define RTAS_TYPE_RETRY			0x01
#define RTAS_TYPE_TCE_ERR		0x02
#define RTAS_TYPE_INTERN_DEV_FAIL	0x03
#define RTAS_TYPE_TIMEOUT		0x04
#define RTAS_TYPE_DATA_PARITY		0x05
#define RTAS_TYPE_ADDR_PARITY		0x06
#define RTAS_TYPE_CACHE_PARITY		0x07
#define RTAS_TYPE_ADDR_INVALID		0x08
#define RTAS_TYPE_ECC_UNCORR		0x09
#define RTAS_TYPE_ECC_CORR		0x0a
#define RTAS_TYPE_EPOW			0x40
#define RTAS_TYPE_PLATFORM		0xE0
#define RTAS_TYPE_IO			0xE1
#define RTAS_TYPE_INFO			0xE2
#define RTAS_TYPE_DEALLOC		0xE3
#define RTAS_TYPE_DUMP			0xE4
/* I don't add PowerMGM events right now, this is a different topic */ 
#define RTAS_TYPE_PMGM_POWER_SW_ON	0x60
#define RTAS_TYPE_PMGM_POWER_SW_OFF	0x61
#define RTAS_TYPE_PMGM_LID_OPEN		0x62
#define RTAS_TYPE_PMGM_LID_CLOSE	0x63
#define RTAS_TYPE_PMGM_SLEEP_BTN	0x64
#define RTAS_TYPE_PMGM_WAKE_BTN		0x65
#define RTAS_TYPE_PMGM_BATTERY_WARN	0x66
#define RTAS_TYPE_PMGM_BATTERY_CRIT	0x67
#define RTAS_TYPE_PMGM_SWITCH_TO_BAT	0x68
#define RTAS_TYPE_PMGM_SWITCH_TO_AC	0x69
#define RTAS_TYPE_PMGM_KBD_OR_MOUSE	0x6a
#define RTAS_TYPE_PMGM_ENCLOS_OPEN	0x6b
#define RTAS_TYPE_PMGM_ENCLOS_CLOSED	0x6c
#define RTAS_TYPE_PMGM_RING_INDICATE	0x6d
#define RTAS_TYPE_PMGM_LAN_ATTENTION	0x6e
#define RTAS_TYPE_PMGM_TIME_ALARM	0x6f
#define RTAS_TYPE_PMGM_CONFIG_CHANGE	0x70
#define RTAS_TYPE_PMGM_SERVICE_PROC	0x71

struct rtas_error_log {
	unsigned long version:8;		/* Architectural version */
	unsigned long severity:3;		/* Severity level of error */
	unsigned long disposition:2;		/* Degree of recovery */
	unsigned long extended:1;		/* extended log present? */
	unsigned long /* reserved */ :2;	/* Reserved for future use */
	unsigned long initiator:4;		/* Initiator of event */
	unsigned long target:4;			/* Target of failed operation */
	unsigned long type:8;			/* General event or error*/
	unsigned long extended_log_length:32;	/* length in bytes */
	unsigned char buffer[1];
};

/*
 * This can be set by the rtas_flash module so that it can get called
 * as the absolutely last thing before the kernel terminates.
 */
extern void (*rtas_flash_term_hook)(int);

extern struct rtas_t rtas;

extern void enter_rtas(unsigned long);
extern int rtas_token(const char *service);
extern int rtas_service_present(const char *service);
extern int rtas_call(int token, int, int, int *, ...);
extern void rtas_restart(char *cmd);
extern void rtas_power_off(void);
extern void rtas_halt(void);
extern void rtas_os_term(char *str);
extern int rtas_get_sensor(int sensor, int index, int *state);
extern int rtas_get_power_level(int powerdomain, int *level);
extern int rtas_set_power_level(int powerdomain, int level, int *setlevel);
extern bool rtas_indicator_present(int token, int *maxindex);
extern int rtas_set_indicator(int indicator, int index, int new_value);
extern int rtas_set_indicator_fast(int indicator, int index, int new_value);
extern void rtas_progress(char *s, unsigned short hex);
extern void rtas_initialize(void);

struct rtc_time;
extern unsigned long rtas_get_boot_time(void);
extern void rtas_get_rtc_time(struct rtc_time *rtc_time);
extern int rtas_set_rtc_time(struct rtc_time *rtc_time);

extern unsigned int rtas_busy_delay_time(int status);
extern unsigned int rtas_busy_delay(int status);

extern int early_init_dt_scan_rtas(unsigned long node,
		const char *uname, int depth, void *data);

extern void pSeries_log_error(char *buf, unsigned int err_type, int fatal);

/* Error types logged.  */
#define ERR_FLAG_ALREADY_LOGGED	0x0
#define ERR_FLAG_BOOT		0x1 	/* log was pulled from NVRAM on boot */
#define ERR_TYPE_RTAS_LOG	0x2	/* from rtas event-scan */
#define ERR_TYPE_KERNEL_PANIC	0x4	/* from panic() */

/* All the types and not flags */
#define ERR_TYPE_MASK	(ERR_TYPE_RTAS_LOG | ERR_TYPE_KERNEL_PANIC)

#define RTAS_DEBUG KERN_DEBUG "RTAS: "
 
#define RTAS_ERROR_LOG_MAX 2048

/*
 * Return the firmware-specified size of the error log buffer
 *  for all rtas calls that require an error buffer argument.
 *  This includes 'check-exception' and 'rtas-last-error'.
 */
extern int rtas_get_error_log_max(void);

/* Event Scan Parameters */
#define EVENT_SCAN_ALL_EVENTS	0xf0000000
#define SURVEILLANCE_TOKEN	9000
#define LOG_NUMBER		64		/* must be a power of two */
#define LOG_NUMBER_MASK		(LOG_NUMBER-1)

/* Some RTAS ops require a data buffer and that buffer must be < 4G.
 * Rather than having a memory allocator, just use this buffer
 * (get the lock first), make the RTAS call.  Copy the data instead
 * of holding the buffer for long.
 */

#define RTAS_DATA_BUF_SIZE 4096
extern spinlock_t rtas_data_buf_lock;
extern char rtas_data_buf[RTAS_DATA_BUF_SIZE];

/* RMO buffer reserved for user-space RTAS use */
extern unsigned long rtas_rmo_buf;

#define GLOBAL_INTERRUPT_QUEUE 9005

/**
 * rtas_config_addr - Format a busno, devfn and reg for RTAS.
 * @busno: The bus number.
 * @devfn: The device and function number as encoded by PCI_DEVFN().
 * @reg: The register number.
 *
 * This function encodes the given busno, devfn and register number as
 * required for RTAS calls that take a "config_addr" parameter.
 * See PAPR requirement 7.3.4-1 for more info.
 */
static inline u32 rtas_config_addr(int busno, int devfn, int reg)
{
	return ((reg & 0xf00) << 20) | ((busno & 0xff) << 16) |
			(devfn << 8) | (reg & 0xff);
}

#endif /* __KERNEL__ */
#endif /* _POWERPC_RTAS_H */