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// SPDX-License-Identifier: GPL-2.0
/*
* Copyright (c) 2011-2017, The Linux Foundation
*/
#ifndef _LINUX_SLIMBUS_H
#define _LINUX_SLIMBUS_H
#include <linux/device.h>
#include <linux/module.h>
#include <linux/completion.h>
#include <linux/mod_devicetable.h>
extern struct bus_type slimbus_bus;
/**
* struct slim_eaddr - Enumeration address for a SLIMbus device
* @instance: Instance value
* @dev_index: Device index
* @prod_code: Product code
* @manf_id: Manufacturer Id for the device
*/
struct slim_eaddr {
u8 instance;
u8 dev_index;
u16 prod_code;
u16 manf_id;
} __packed;
/**
* enum slim_device_status - slim device status
* @SLIM_DEVICE_STATUS_DOWN: Slim device is absent or not reported yet.
* @SLIM_DEVICE_STATUS_UP: Slim device is announced on the bus.
* @SLIM_DEVICE_STATUS_RESERVED: Reserved for future use.
*/
enum slim_device_status {
SLIM_DEVICE_STATUS_DOWN = 0,
SLIM_DEVICE_STATUS_UP,
SLIM_DEVICE_STATUS_RESERVED,
};
struct slim_controller;
/**
* struct slim_device - Slim device handle.
* @dev: Driver model representation of the device.
* @e_addr: Enumeration address of this device.
* @status: slim device status
* @ctrl: slim controller instance.
* @laddr: 1-byte Logical address of this device.
* @is_laddr_valid: indicates if the laddr is valid or not
*
* This is the client/device handle returned when a SLIMbus
* device is registered with a controller.
* Pointer to this structure is used by client-driver as a handle.
*/
struct slim_device {
struct device dev;
struct slim_eaddr e_addr;
struct slim_controller *ctrl;
enum slim_device_status status;
u8 laddr;
bool is_laddr_valid;
};
#define to_slim_device(d) container_of(d, struct slim_device, dev)
/**
* struct slim_driver - SLIMbus 'generic device' (slave) device driver
* (similar to 'spi_device' on SPI)
* @probe: Binds this driver to a SLIMbus device.
* @remove: Unbinds this driver from the SLIMbus device.
* @shutdown: Standard shutdown callback used during powerdown/halt.
* @device_status: This callback is called when
* - The device reports present and gets a laddr assigned
* - The device reports absent, or the bus goes down.
* @driver: SLIMbus device drivers should initialize name and owner field of
* this structure
* @id_table: List of SLIMbus devices supported by this driver
*/
struct slim_driver {
int (*probe)(struct slim_device *sl);
void (*remove)(struct slim_device *sl);
void (*shutdown)(struct slim_device *sl);
int (*device_status)(struct slim_device *sl,
enum slim_device_status s);
struct device_driver driver;
const struct slim_device_id *id_table;
};
#define to_slim_driver(d) container_of(d, struct slim_driver, driver)
/**
* struct slim_val_inf - Slimbus value or information element
* @start_offset: Specifies starting offset in information/value element map
* @rbuf: buffer to read the values
* @wbuf: buffer to write
* @num_bytes: upto 16. This ensures that the message will fit the slicesize
* per SLIMbus spec
* @comp: completion for asynchronous operations, valid only if TID is
* required for transaction, like REQUEST operations.
* Rest of the transactions are synchronous anyway.
*/
struct slim_val_inf {
u16 start_offset;
u8 num_bytes;
u8 *rbuf;
const u8 *wbuf;
struct completion *comp;
};
/*
* use a macro to avoid include chaining to get THIS_MODULE
*/
#define slim_driver_register(drv) \
__slim_driver_register(drv, THIS_MODULE)
int __slim_driver_register(struct slim_driver *drv, struct module *owner);
void slim_driver_unregister(struct slim_driver *drv);
/**
* module_slim_driver() - Helper macro for registering a SLIMbus driver
* @__slim_driver: slimbus_driver struct
*
* Helper macro for SLIMbus drivers which do not do anything special in module
* init/exit. This eliminates a lot of boilerplate. Each module may only
* use this macro once, and calling it replaces module_init() and module_exit()
*/
#define module_slim_driver(__slim_driver) \
module_driver(__slim_driver, slim_driver_register, \
slim_driver_unregister)
static inline void *slim_get_devicedata(const struct slim_device *dev)
{
return dev_get_drvdata(&dev->dev);
}
static inline void slim_set_devicedata(struct slim_device *dev, void *data)
{
dev_set_drvdata(&dev->dev, data);
}
struct slim_device *of_slim_get_device(struct slim_controller *ctrl,
struct device_node *np);
struct slim_device *slim_get_device(struct slim_controller *ctrl,
struct slim_eaddr *e_addr);
int slim_get_logical_addr(struct slim_device *sbdev);
/* Information Element management messages */
#define SLIM_MSG_MC_REQUEST_INFORMATION 0x20
#define SLIM_MSG_MC_REQUEST_CLEAR_INFORMATION 0x21
#define SLIM_MSG_MC_REPLY_INFORMATION 0x24
#define SLIM_MSG_MC_CLEAR_INFORMATION 0x28
#define SLIM_MSG_MC_REPORT_INFORMATION 0x29
/* Value Element management messages */
#define SLIM_MSG_MC_REQUEST_VALUE 0x60
#define SLIM_MSG_MC_REQUEST_CHANGE_VALUE 0x61
#define SLIM_MSG_MC_REPLY_VALUE 0x64
#define SLIM_MSG_MC_CHANGE_VALUE 0x68
int slim_xfer_msg(struct slim_device *sbdev, struct slim_val_inf *msg,
u8 mc);
int slim_readb(struct slim_device *sdev, u32 addr);
int slim_writeb(struct slim_device *sdev, u32 addr, u8 value);
int slim_read(struct slim_device *sdev, u32 addr, size_t count, u8 *val);
int slim_write(struct slim_device *sdev, u32 addr, size_t count, u8 *val);
#endif /* _LINUX_SLIMBUS_H */
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