/* SPDX-License-Identifier: GPL-2.0-only */
/*
* Industry - pack bus .
*
* Copyright ( C ) 2011 - 2012 CERN ( www . cern . ch )
* Author : Samuel Iglesias Gonsalvez < siglesias @ igalia . com >
*/
#include <linux/mod_devicetable.h>
#include <linux/device.h>
#include <linux/interrupt.h>
#define IPACK_IDPROM_OFFSET_I 0 x01
#define IPACK_IDPROM_OFFSET_P 0 x03
#define IPACK_IDPROM_OFFSET_A 0 x05
#define IPACK_IDPROM_OFFSET_C 0 x07
#define IPACK_IDPROM_OFFSET_MANUFACTURER_ID 0 x09
#define IPACK_IDPROM_OFFSET_MODEL 0 x0B
#define IPACK_IDPROM_OFFSET_REVISION 0 x0D
#define IPACK_IDPROM_OFFSET_RESERVED 0 x0F
#define IPACK_IDPROM_OFFSET_DRIVER_ID_L 0 x11
#define IPACK_IDPROM_OFFSET_DRIVER_ID_H 0 x13
#define IPACK_IDPROM_OFFSET_NUM_BYTES 0 x15
#define IPACK_IDPROM_OFFSET_CRC 0 x17
/*
* IndustryPack Fromat , Vendor and Device IDs .
*/
/* ID section format versions */
#define IPACK_ID_VERSION_INVALID 0 x00
#define IPACK_ID_VERSION_1 0 x01
#define IPACK_ID_VERSION_2 0 x02
/* Vendors and devices. Sort key: vendor first, device next. */
#define IPACK1_VENDOR_ID_RESERVED1 0 x00
#define IPACK1_VENDOR_ID_RESERVED2 0 xFF
#define IPACK1_VENDOR_ID_UNREGISTRED01 0 x01
#define IPACK1_VENDOR_ID_UNREGISTRED02 0 x02
#define IPACK1_VENDOR_ID_UNREGISTRED03 0 x03
#define IPACK1_VENDOR_ID_UNREGISTRED04 0 x04
#define IPACK1_VENDOR_ID_UNREGISTRED05 0 x05
#define IPACK1_VENDOR_ID_UNREGISTRED06 0 x06
#define IPACK1_VENDOR_ID_UNREGISTRED07 0 x07
#define IPACK1_VENDOR_ID_UNREGISTRED08 0 x08
#define IPACK1_VENDOR_ID_UNREGISTRED09 0 x09
#define IPACK1_VENDOR_ID_UNREGISTRED10 0 x0A
#define IPACK1_VENDOR_ID_UNREGISTRED11 0 x0B
#define IPACK1_VENDOR_ID_UNREGISTRED12 0 x0C
#define IPACK1_VENDOR_ID_UNREGISTRED13 0 x0D
#define IPACK1_VENDOR_ID_UNREGISTRED14 0 x0E
#define IPACK1_VENDOR_ID_UNREGISTRED15 0 x0F
#define IPACK1_VENDOR_ID_SBS 0 xF0
#define IPACK1_DEVICE_ID_SBS_OCTAL_232 0 x22
#define IPACK1_DEVICE_ID_SBS_OCTAL_422 0 x2A
#define IPACK1_DEVICE_ID_SBS_OCTAL_485 0 x48
struct ipack_bus_ops;
struct ipack_driver;
enum ipack_space {
IPACK_IO_SPACE = 0 ,
IPACK_ID_SPACE,
IPACK_INT_SPACE,
IPACK_MEM8_SPACE,
IPACK_MEM16_SPACE,
/* Dummy for counting the number of entries. Must remain the last
* entry */
IPACK_SPACE_COUNT,
};
/**
*/
struct ipack_region {
phys_addr_t start;
size_t size;
};
/**
* struct ipack_device
*
* @ slot : Slot where the device is plugged in the carrier board
* @ bus : ipack_bus_device where the device is plugged to .
* @ id_space : Virtual address to ID space .
* @ io_space : Virtual address to IO space .
* @ mem_space : Virtual address to MEM space .
* @ dev : device in kernel representation .
*
* Warning : Direct access to mapped memory is possible but the endianness
* is not the same with PCI carrier or VME carrier . The endianness is managed
* by the carrier board throught bus - > ops .
*/
struct ipack_device {
unsigned int slot;
struct ipack_bus_device *bus;
struct device dev;
void (*release) (struct ipack_device *dev);
struct ipack_region region[IPACK_SPACE_COUNT];
u8 *id;
size_t id_avail;
u32 id_vendor;
u32 id_device;
u8 id_format;
unsigned int id_crc_correct:1 ;
unsigned int speed_8mhz:1 ;
unsigned int speed_32mhz:1 ;
};
/**
* struct ipack_driver_ops - - Callbacks to IPack device driver
*
* @ probe : Probe function
* @ remove : Prepare imminent removal of the device . Services provided by the
* device should be revoked .
*/
struct ipack_driver_ops {
int (*probe) (struct ipack_device *dev);
void (*remove) (struct ipack_device *dev);
};
/**
* struct ipack_driver - - Specific data to each ipack device driver
*
* @ driver : Device driver kernel representation
* @ ops : Callbacks provided by the IPack device driver
*/
struct ipack_driver {
struct device_driver driver;
const struct ipack_device_id *id_table;
const struct ipack_driver_ops *ops;
};
/**
* struct ipack_bus_ops - available operations on a bridge module
*
* @ map_space : map IP address space
* @ unmap_space : unmap IP address space
* @ request_irq : request IRQ
* @ free_irq : free IRQ
* @ get_clockrate : Returns the clockrate the carrier is currently
* communicating with the device at .
* @ set_clockrate : Sets the clock - rate for carrier / module communication .
* Should return - EINVAL if the requested speed is not supported .
* @ get_error : Returns the error state for the slot the device is attached
* to .
* @ get_timeout : Returns 1 if the communication with the device has
* previously timed out .
* @ reset_timeout : Resets the state returned by get_timeout .
*/
struct ipack_bus_ops {
int (*request_irq) (struct ipack_device *dev,
irqreturn_t (*handler)(void *), void *arg);
int (*free_irq) (struct ipack_device *dev);
int (*get_clockrate) (struct ipack_device *dev);
int (*set_clockrate) (struct ipack_device *dev, int mherz);
int (*get_error) (struct ipack_device *dev);
int (*get_timeout) (struct ipack_device *dev);
int (*reset_timeout) (struct ipack_device *dev);
};
/**
* struct ipack_bus_device
*
* @ dev : pointer to carrier device
* @ slots : number of slots available
* @ bus_nr : ipack bus number
* @ ops : bus operations for the mezzanine drivers
*/
struct ipack_bus_device {
struct module *owner;
struct device *parent;
int slots;
int bus_nr;
const struct ipack_bus_ops *ops;
};
/**
* ipack_bus_register - - register a new ipack bus
*
* @ parent : pointer to the parent device , if any .
* @ slots : number of slots available in the bus device .
* @ ops : bus operations for the mezzanine drivers .
*
* The carrier board device should call this function to register itself as
* available bus device in ipack .
*/
struct ipack_bus_device *ipack_bus_register(struct device *parent, int slots,
const struct ipack_bus_ops *ops,
struct module *owner);
/**
* ipack_bus_unregister - - unregister an ipack bus
*/
int ipack_bus_unregister(struct ipack_bus_device *bus);
/**
* ipack_driver_register - - Register a new ipack device driver
*
* Called by a ipack driver to register itself as a driver
* that can manage ipack devices .
*/
int ipack_driver_register(struct ipack_driver *edrv, struct module *owner,
const char *name);
void ipack_driver_unregister(struct ipack_driver *edrv);
/**
* ipack_device_init - - initialize an IPack device
* @ dev : the new device to initialize .
*
* Initialize a new IPack device ( " module " in IndustryPack jargon ) . The call
* is done by the carrier driver . The carrier should populate the fields
* bus and slot as well as the region array of @ dev prior to calling this
* function . The rest of the fields will be allocated and populated
* during initalization .
*
* Return zero on success or error code on failure .
*
* NOTE : _ Never_ directly free @ dev after calling this function , even
* if it returned an error ! Always use ipack_put_device ( ) to give up the
* reference initialized in this function instead .
*/
int ipack_device_init(struct ipack_device *dev);
/**
* ipack_device_add - - Add an IPack device
* @ dev : the new device to add .
*
* Add a new IPack device . The call is done by the carrier driver
* after calling ipack_device_init ( ) .
*
* Return zero on success or error code on failure .
*
* NOTE : _ Never_ directly free @ dev after calling this function , even
* if it returned an error ! Always use ipack_put_device ( ) to give up the
* reference initialized in this function instead .
*/
int ipack_device_add(struct ipack_device *dev);
void ipack_device_del(struct ipack_device *dev);
void ipack_get_device(struct ipack_device *dev);
void ipack_put_device(struct ipack_device *dev);
/**
* DEFINE_IPACK_DEVICE_TABLE - macro used to describe a IndustryPack table
* @ _ table : device table name
*
* This macro is used to create a struct ipack_device_id array ( a device table )
* in a generic manner .
*/
#define DEFINE_IPACK_DEVICE_TABLE(_table) \
const struct ipack_device_id _table[]
/**
* IPACK_DEVICE - macro used to describe a specific IndustryPack device
* @ _ format : the format version ( currently either 1 or 2 , 8 bit value )
* @ vend : the 8 or 24 bit IndustryPack Vendor ID
* @ dev : the 8 or 16 bit IndustryPack Device ID
*
* This macro is used to create a struct ipack_device_id that matches a specific
* device .
*/
#define IPACK_DEVICE(_format, vend, dev) \
.format = (_format), \
.vendor = (vend), \
.device = (dev)
/**
* ipack_get_carrier - it increase the carrier ref . counter of
* the carrier module
* @ dev : mezzanine device which wants to get the carrier
*/
static inline int ipack_get_carrier(struct ipack_device *dev)
{
return try_module_get(dev->bus->owner);
}
/**
* ipack_get_carrier - it decrease the carrier ref . counter of
* the carrier module
* @ dev : mezzanine device which wants to get the carrier
*/
static inline void ipack_put_carrier(struct ipack_device *dev)
{
module_put(dev->bus->owner);
}
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