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/* 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 0x01
#define IPACK_IDPROM_OFFSET_P 0x03
#define IPACK_IDPROM_OFFSET_A 0x05
#define IPACK_IDPROM_OFFSET_C 0x07
#define IPACK_IDPROM_OFFSET_MANUFACTURER_ID 0x09
#define IPACK_IDPROM_OFFSET_MODEL 0x0B
#define IPACK_IDPROM_OFFSET_REVISION 0x0D
#define IPACK_IDPROM_OFFSET_RESERVED 0x0F
#define IPACK_IDPROM_OFFSET_DRIVER_ID_L 0x11
#define IPACK_IDPROM_OFFSET_DRIVER_ID_H 0x13
#define IPACK_IDPROM_OFFSET_NUM_BYTES 0x15
#define IPACK_IDPROM_OFFSET_CRC 0x17
/*
* IndustryPack Fromat, Vendor and Device IDs.
*/
/* ID section format versions */
#define IPACK_ID_VERSION_INVALID 0x00
#define IPACK_ID_VERSION_1 0x01
#define IPACK_ID_VERSION_2 0x02
/* Vendors and devices. Sort key: vendor first, device next. */
#define IPACK1_VENDOR_ID_RESERVED1 0x00
#define IPACK1_VENDOR_ID_RESERVED2 0xFF
#define IPACK1_VENDOR_ID_UNREGISTRED01 0x01
#define IPACK1_VENDOR_ID_UNREGISTRED02 0x02
#define IPACK1_VENDOR_ID_UNREGISTRED03 0x03
#define IPACK1_VENDOR_ID_UNREGISTRED04 0x04
#define IPACK1_VENDOR_ID_UNREGISTRED05 0x05
#define IPACK1_VENDOR_ID_UNREGISTRED06 0x06
#define IPACK1_VENDOR_ID_UNREGISTRED07 0x07
#define IPACK1_VENDOR_ID_UNREGISTRED08 0x08
#define IPACK1_VENDOR_ID_UNREGISTRED09 0x09
#define IPACK1_VENDOR_ID_UNREGISTRED10 0x0A
#define IPACK1_VENDOR_ID_UNREGISTRED11 0x0B
#define IPACK1_VENDOR_ID_UNREGISTRED12 0x0C
#define IPACK1_VENDOR_ID_UNREGISTRED13 0x0D
#define IPACK1_VENDOR_ID_UNREGISTRED14 0x0E
#define IPACK1_VENDOR_ID_UNREGISTRED15 0x0F
#define IPACK1_VENDOR_ID_SBS 0xF0
#define IPACK1_DEVICE_ID_SBS_OCTAL_232 0x22
#define IPACK1_DEVICE_ID_SBS_OCTAL_422 0x2A
#define IPACK1_DEVICE_ID_SBS_OCTAL_485 0x48
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);
}