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36c53b3cc3
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>
289 lines
8.8 KiB
C
289 lines
8.8 KiB
C
/*
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* Industry-pack bus.
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*
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* Copyright (C) 2011-2012 CERN (www.cern.ch)
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* Author: Samuel Iglesias Gonsalvez <siglesias@igalia.com>
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License as published by the Free
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* Software Foundation; version 2 of the License.
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*/
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#include <linux/mod_devicetable.h>
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#include <linux/device.h>
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#include <linux/interrupt.h>
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#define IPACK_IDPROM_OFFSET_I 0x01
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#define IPACK_IDPROM_OFFSET_P 0x03
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#define IPACK_IDPROM_OFFSET_A 0x05
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#define IPACK_IDPROM_OFFSET_C 0x07
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#define IPACK_IDPROM_OFFSET_MANUFACTURER_ID 0x09
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#define IPACK_IDPROM_OFFSET_MODEL 0x0B
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#define IPACK_IDPROM_OFFSET_REVISION 0x0D
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#define IPACK_IDPROM_OFFSET_RESERVED 0x0F
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#define IPACK_IDPROM_OFFSET_DRIVER_ID_L 0x11
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#define IPACK_IDPROM_OFFSET_DRIVER_ID_H 0x13
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#define IPACK_IDPROM_OFFSET_NUM_BYTES 0x15
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#define IPACK_IDPROM_OFFSET_CRC 0x17
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/*
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* IndustryPack Fromat, Vendor and Device IDs.
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*/
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/* ID section format versions */
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#define IPACK_ID_VERSION_INVALID 0x00
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#define IPACK_ID_VERSION_1 0x01
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#define IPACK_ID_VERSION_2 0x02
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/* Vendors and devices. Sort key: vendor first, device next. */
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#define IPACK1_VENDOR_ID_RESERVED1 0x00
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#define IPACK1_VENDOR_ID_RESERVED2 0xFF
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#define IPACK1_VENDOR_ID_UNREGISTRED01 0x01
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#define IPACK1_VENDOR_ID_UNREGISTRED02 0x02
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#define IPACK1_VENDOR_ID_UNREGISTRED03 0x03
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#define IPACK1_VENDOR_ID_UNREGISTRED04 0x04
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#define IPACK1_VENDOR_ID_UNREGISTRED05 0x05
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#define IPACK1_VENDOR_ID_UNREGISTRED06 0x06
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#define IPACK1_VENDOR_ID_UNREGISTRED07 0x07
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#define IPACK1_VENDOR_ID_UNREGISTRED08 0x08
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#define IPACK1_VENDOR_ID_UNREGISTRED09 0x09
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#define IPACK1_VENDOR_ID_UNREGISTRED10 0x0A
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#define IPACK1_VENDOR_ID_UNREGISTRED11 0x0B
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#define IPACK1_VENDOR_ID_UNREGISTRED12 0x0C
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#define IPACK1_VENDOR_ID_UNREGISTRED13 0x0D
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#define IPACK1_VENDOR_ID_UNREGISTRED14 0x0E
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#define IPACK1_VENDOR_ID_UNREGISTRED15 0x0F
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#define IPACK1_VENDOR_ID_SBS 0xF0
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#define IPACK1_DEVICE_ID_SBS_OCTAL_232 0x22
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#define IPACK1_DEVICE_ID_SBS_OCTAL_422 0x2A
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#define IPACK1_DEVICE_ID_SBS_OCTAL_485 0x48
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struct ipack_bus_ops;
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struct ipack_driver;
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enum ipack_space {
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IPACK_IO_SPACE = 0,
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IPACK_ID_SPACE,
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IPACK_INT_SPACE,
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IPACK_MEM8_SPACE,
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IPACK_MEM16_SPACE,
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/* Dummy for counting the number of entries. Must remain the last
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* entry */
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IPACK_SPACE_COUNT,
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};
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/**
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*/
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struct ipack_region {
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phys_addr_t start;
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size_t size;
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};
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/**
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* struct ipack_device
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*
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* @slot: Slot where the device is plugged in the carrier board
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* @bus: ipack_bus_device where the device is plugged to.
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* @id_space: Virtual address to ID space.
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* @io_space: Virtual address to IO space.
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* @mem_space: Virtual address to MEM space.
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* @dev: device in kernel representation.
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*
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* Warning: Direct access to mapped memory is possible but the endianness
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* is not the same with PCI carrier or VME carrier. The endianness is managed
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* by the carrier board throught bus->ops.
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*/
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struct ipack_device {
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unsigned int slot;
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struct ipack_bus_device *bus;
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struct device dev;
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void (*release) (struct ipack_device *dev);
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struct ipack_region region[IPACK_SPACE_COUNT];
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u8 *id;
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size_t id_avail;
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u32 id_vendor;
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u32 id_device;
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u8 id_format;
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unsigned int id_crc_correct:1;
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unsigned int speed_8mhz:1;
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unsigned int speed_32mhz:1;
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};
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/**
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* struct ipack_driver_ops -- Callbacks to IPack device driver
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*
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* @probe: Probe function
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* @remove: Prepare imminent removal of the device. Services provided by the
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* device should be revoked.
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*/
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struct ipack_driver_ops {
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int (*probe) (struct ipack_device *dev);
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void (*remove) (struct ipack_device *dev);
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};
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/**
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* struct ipack_driver -- Specific data to each ipack device driver
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*
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* @driver: Device driver kernel representation
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* @ops: Callbacks provided by the IPack device driver
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*/
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struct ipack_driver {
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struct device_driver driver;
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const struct ipack_device_id *id_table;
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const struct ipack_driver_ops *ops;
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};
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/**
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* struct ipack_bus_ops - available operations on a bridge module
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*
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* @map_space: map IP address space
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* @unmap_space: unmap IP address space
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* @request_irq: request IRQ
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* @free_irq: free IRQ
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* @get_clockrate: Returns the clockrate the carrier is currently
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* communicating with the device at.
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* @set_clockrate: Sets the clock-rate for carrier / module communication.
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* Should return -EINVAL if the requested speed is not supported.
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* @get_error: Returns the error state for the slot the device is attached
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* to.
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* @get_timeout: Returns 1 if the communication with the device has
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* previously timed out.
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* @reset_timeout: Resets the state returned by get_timeout.
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*/
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struct ipack_bus_ops {
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int (*request_irq) (struct ipack_device *dev,
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irqreturn_t (*handler)(void *), void *arg);
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int (*free_irq) (struct ipack_device *dev);
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int (*get_clockrate) (struct ipack_device *dev);
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int (*set_clockrate) (struct ipack_device *dev, int mherz);
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int (*get_error) (struct ipack_device *dev);
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int (*get_timeout) (struct ipack_device *dev);
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int (*reset_timeout) (struct ipack_device *dev);
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};
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/**
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* struct ipack_bus_device
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*
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* @dev: pointer to carrier device
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* @slots: number of slots available
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* @bus_nr: ipack bus number
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* @ops: bus operations for the mezzanine drivers
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*/
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struct ipack_bus_device {
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struct module *owner;
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struct device *parent;
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int slots;
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int bus_nr;
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const struct ipack_bus_ops *ops;
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};
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/**
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* ipack_bus_register -- register a new ipack bus
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*
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* @parent: pointer to the parent device, if any.
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* @slots: number of slots available in the bus device.
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* @ops: bus operations for the mezzanine drivers.
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*
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* The carrier board device should call this function to register itself as
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* available bus device in ipack.
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*/
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struct ipack_bus_device *ipack_bus_register(struct device *parent, int slots,
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const struct ipack_bus_ops *ops,
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struct module *owner);
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/**
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* ipack_bus_unregister -- unregister an ipack bus
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*/
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int ipack_bus_unregister(struct ipack_bus_device *bus);
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/**
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* ipack_driver_register -- Register a new ipack device driver
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*
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* Called by a ipack driver to register itself as a driver
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* that can manage ipack devices.
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*/
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int ipack_driver_register(struct ipack_driver *edrv, struct module *owner,
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const char *name);
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void ipack_driver_unregister(struct ipack_driver *edrv);
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/**
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* ipack_device_init -- initialize an IPack device
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* @dev: the new device to initialize.
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*
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* Initialize a new IPack device ("module" in IndustryPack jargon). The call
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* is done by the carrier driver. The carrier should populate the fields
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* bus and slot as well as the region array of @dev prior to calling this
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* function. The rest of the fields will be allocated and populated
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* during initalization.
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*
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* Return zero on success or error code on failure.
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*
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* NOTE: _Never_ directly free @dev after calling this function, even
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* if it returned an error! Always use ipack_put_device() to give up the
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* reference initialized in this function instead.
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*/
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int ipack_device_init(struct ipack_device *dev);
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/**
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* ipack_device_add -- Add an IPack device
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* @dev: the new device to add.
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*
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* Add a new IPack device. The call is done by the carrier driver
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* after calling ipack_device_init().
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*
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* Return zero on success or error code on failure.
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*
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* NOTE: _Never_ directly free @dev after calling this function, even
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* if it returned an error! Always use ipack_put_device() to give up the
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* reference initialized in this function instead.
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*/
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int ipack_device_add(struct ipack_device *dev);
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void ipack_device_del(struct ipack_device *dev);
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void ipack_get_device(struct ipack_device *dev);
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void ipack_put_device(struct ipack_device *dev);
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/**
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* DEFINE_IPACK_DEVICE_TABLE - macro used to describe a IndustryPack table
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* @_table: device table name
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*
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* This macro is used to create a struct ipack_device_id array (a device table)
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* in a generic manner.
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*/
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#define DEFINE_IPACK_DEVICE_TABLE(_table) \
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const struct ipack_device_id _table[]
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/**
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* IPACK_DEVICE - macro used to describe a specific IndustryPack device
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* @_format: the format version (currently either 1 or 2, 8 bit value)
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* @vend: the 8 or 24 bit IndustryPack Vendor ID
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* @dev: the 8 or 16 bit IndustryPack Device ID
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*
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* This macro is used to create a struct ipack_device_id that matches a specific
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* device.
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*/
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#define IPACK_DEVICE(_format, vend, dev) \
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.format = (_format), \
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.vendor = (vend), \
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.device = (dev)
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/**
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* ipack_get_carrier - it increase the carrier ref. counter of
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* the carrier module
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* @dev: mezzanine device which wants to get the carrier
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*/
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static inline int ipack_get_carrier(struct ipack_device *dev)
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{
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return try_module_get(dev->bus->owner);
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}
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/**
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* ipack_get_carrier - it decrease the carrier ref. counter of
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* the carrier module
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* @dev: mezzanine device which wants to get the carrier
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*/
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static inline void ipack_put_carrier(struct ipack_device *dev)
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{
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module_put(dev->bus->owner);
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}
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