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/* SPDX-License-Identifier: GPL-2.0 */
#ifndef __PMAC_PFUNC_H__
#define __PMAC_PFUNC_H__
#include <linux/types.h>
#include <linux/list.h>
/* Flags in command lists */
#define PMF_FLAGS_ON_INIT 0x80000000u
#define PMF_FLGAS_ON_TERM 0x40000000u
#define PMF_FLAGS_ON_SLEEP 0x20000000u
#define PMF_FLAGS_ON_WAKE 0x10000000u
#define PMF_FLAGS_ON_DEMAND 0x08000000u
#define PMF_FLAGS_INT_GEN 0x04000000u
#define PMF_FLAGS_HIGH_SPEED 0x02000000u
#define PMF_FLAGS_LOW_SPEED 0x01000000u
#define PMF_FLAGS_SIDE_EFFECTS 0x00800000u
/*
* Arguments to a platform function call.
*
* NOTE: By convention, pointer arguments point to an u32
*/
struct pmf_args {
union {
u32 v;
u32 *p;
} u[4];
unsigned int count;
};
/*
* A driver capable of interpreting commands provides a handlers
* structure filled with whatever handlers are implemented by this
* driver. Non implemented handlers are left NULL.
*
* PMF_STD_ARGS are the same arguments that are passed to the parser
* and that gets passed back to the various handlers.
*
* Interpreting a given function always start with a begin() call which
* returns an instance data to be passed around subsequent calls, and
* ends with an end() call. This allows the low level driver to implement
* locking policy or per-function instance data.
*
* For interrupt capable functions, irq_enable() is called when a client
* registers, and irq_disable() is called when the last client unregisters
* Note that irq_enable & irq_disable are called within a semaphore held
* by the core, thus you should not try to register yourself to some other
* pmf interrupt during those calls.
*/
#define PMF_STD_ARGS struct pmf_function *func, void *instdata, \
struct pmf_args *args
struct pmf_function;
struct pmf_handlers {
void * (*begin)(struct pmf_function *func, struct pmf_args *args);
void (*end)(struct pmf_function *func, void *instdata);
int (*irq_enable)(struct pmf_function *func);
int (*irq_disable)(struct pmf_function *func);
int (*write_gpio)(PMF_STD_ARGS, u8 value, u8 mask);
int (*read_gpio)(PMF_STD_ARGS, u8 mask, int rshift, u8 xor);
int (*write_reg32)(PMF_STD_ARGS, u32 offset, u32 value, u32 mask);
int (*read_reg32)(PMF_STD_ARGS, u32 offset);
int (*write_reg16)(PMF_STD_ARGS, u32 offset, u16 value, u16 mask);
int (*read_reg16)(PMF_STD_ARGS, u32 offset);
int (*write_reg8)(PMF_STD_ARGS, u32 offset, u8 value, u8 mask);
int (*read_reg8)(PMF_STD_ARGS, u32 offset);
int (*delay)(PMF_STD_ARGS, u32 duration);
int (*wait_reg32)(PMF_STD_ARGS, u32 offset, u32 value, u32 mask);
int (*wait_reg16)(PMF_STD_ARGS, u32 offset, u16 value, u16 mask);
int (*wait_reg8)(PMF_STD_ARGS, u32 offset, u8 value, u8 mask);
int (*read_i2c)(PMF_STD_ARGS, u32 len);
int (*write_i2c)(PMF_STD_ARGS, u32 len, const u8 *data);
int (*rmw_i2c)(PMF_STD_ARGS, u32 masklen, u32 valuelen, u32 totallen,
const u8 *maskdata, const u8 *valuedata);
int (*read_cfg)(PMF_STD_ARGS, u32 offset, u32 len);
int (*write_cfg)(PMF_STD_ARGS, u32 offset, u32 len, const u8 *data);
int (*rmw_cfg)(PMF_STD_ARGS, u32 offset, u32 masklen, u32 valuelen,
u32 totallen, const u8 *maskdata, const u8 *valuedata);
int (*read_i2c_sub)(PMF_STD_ARGS, u8 subaddr, u32 len);
int (*write_i2c_sub)(PMF_STD_ARGS, u8 subaddr, u32 len, const u8 *data);
int (*set_i2c_mode)(PMF_STD_ARGS, int mode);
int (*rmw_i2c_sub)(PMF_STD_ARGS, u8 subaddr, u32 masklen, u32 valuelen,
u32 totallen, const u8 *maskdata,
const u8 *valuedata);
int (*read_reg32_msrx)(PMF_STD_ARGS, u32 offset, u32 mask, u32 shift,
u32 xor);
int (*read_reg16_msrx)(PMF_STD_ARGS, u32 offset, u32 mask, u32 shift,
u32 xor);
int (*read_reg8_msrx)(PMF_STD_ARGS, u32 offset, u32 mask, u32 shift,
u32 xor);
int (*write_reg32_slm)(PMF_STD_ARGS, u32 offset, u32 shift, u32 mask);
int (*write_reg16_slm)(PMF_STD_ARGS, u32 offset, u32 shift, u32 mask);
int (*write_reg8_slm)(PMF_STD_ARGS, u32 offset, u32 shift, u32 mask);
int (*mask_and_compare)(PMF_STD_ARGS, u32 len, const u8 *maskdata,
const u8 *valuedata);
struct module *owner;
};
/*
* Drivers who expose platform functions register at init time, this
* causes the platform functions for that device node to be parsed in
* advance and associated with the device. The data structures are
* partially public so a driver can walk the list of platform functions
* and eventually inspect the flags
*/
struct pmf_device;
struct pmf_function {
/* All functions for a given driver are linked */
struct list_head link;
/* Function node & driver data */
struct device_node *node;
void *driver_data;
/* For internal use by core */
struct pmf_device *dev;
/* The name is the "xxx" in "platform-do-xxx", this is how
* platform functions are identified by this code. Some functions
* only operate for a given target, in which case the phandle is
* here (or 0 if the filter doesn't apply)
*/
const char *name;
u32 phandle;
/* The flags for that function. You can have several functions
* with the same name and different flag
*/
u32 flags;
/* The actual tokenized function blob */
const void *data;
unsigned int length;
/* Interrupt clients */
struct list_head irq_clients;
/* Refcounting */
struct kref ref;
};
/*
* For platform functions that are interrupts, one can register
* irq_client structures. You canNOT use the same structure twice
* as it contains a link member. Also, the callback is called with
* a spinlock held, you must not call back into any of the pmf_* functions
* from within that callback
*/
struct pmf_irq_client {
void (*handler)(void *data);
void *data;
struct module *owner;
struct list_head link;
struct pmf_function *func;
};
/*
* Register/Unregister a function-capable driver and its handlers
*/
extern int pmf_register_driver(struct device_node *np,
struct pmf_handlers *handlers,
void *driverdata);
extern void pmf_unregister_driver(struct device_node *np);
/*
* Register/Unregister interrupt clients
*/
extern int pmf_register_irq_client(struct device_node *np,
const char *name,
struct pmf_irq_client *client);
extern void pmf_unregister_irq_client(struct pmf_irq_client *client);
/*
* Called by the handlers when an irq happens
*/
extern void pmf_do_irq(struct pmf_function *func);
/*
* Low level call to platform functions.
*
* The phandle can filter on the target object for functions that have
* multiple targets, the flags allow you to restrict the call to a given
* combination of flags.
*
* The args array contains as many arguments as is required by the function,
* this is dependent on the function you are calling, unfortunately Apple
* mechanism provides no way to encode that so you have to get it right at
* the call site. Some functions require no args, in which case, you can
* pass NULL.
*
* You can also pass NULL to the name. This will match any function that has
* the appropriate combination of flags & phandle or you can pass 0 to the
* phandle to match any
*/
extern int pmf_do_functions(struct device_node *np, const char *name,
u32 phandle, u32 flags, struct pmf_args *args);
/*
* High level call to a platform function.
*
* This one looks for the platform-xxx first so you should call it to the
* actual target if any. It will fallback to platform-do-xxx if it can't
* find one. It will also exclusively target functions that have
* the "OnDemand" flag.
*/
extern int pmf_call_function(struct device_node *target, const char *name,
struct pmf_args *args);
/*
* For low latency interrupt usage, you can lookup for on-demand functions
* using the functions below
*/
extern struct pmf_function *pmf_find_function(struct device_node *target,
const char *name);
extern struct pmf_function * pmf_get_function(struct pmf_function *func);
extern void pmf_put_function(struct pmf_function *func);
extern int pmf_call_one(struct pmf_function *func, struct pmf_args *args);
int pmac_pfunc_base_install(void);
/* Suspend/resume code called by via-pmu directly for now */
extern void pmac_pfunc_base_suspend(void);
extern void pmac_pfunc_base_resume(void);
#endif /* __PMAC_PFUNC_H__ */
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