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kernel-fxtec-pro1x/include/linux/ipack.h
Federico Vaga 36c53b3cc3 ipack: save carrier owner to allow device to get it 
There was not any kind of protection against carrier driver removal.
In this way, device driver can 'get' the carrier driver when it is
using it.

Signed-off-by: Federico Vaga <federico.vaga@cern.ch>
Acked-by: Samuel Iglesias Gonsalvez <siglesias@igalia.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2014-09-23 23:13:13 -07:00

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/*
* Industry-pack bus.
*
* Copyright (C) 2011-2012 CERN (www.cern.ch)
* Author: Samuel Iglesias Gonsalvez <siglesias@igalia.com>
*
* 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; version 2 of the License.
*/
#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);
}
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