07bbeaf123
"ack_code" is assigned (and tested against) negative numbers, but was declared as "char". Which only works if "char" is signed - which it necessarily isn't. So make that signedness assumption specific.
229 lines
7.4 KiB
C
229 lines
7.4 KiB
C
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#ifndef _IEEE1394_CORE_H
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#define _IEEE1394_CORE_H
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#include <linux/slab.h>
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#include <linux/devfs_fs_kernel.h>
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#include <asm/atomic.h>
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#include <asm/semaphore.h>
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#include "hosts.h"
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struct hpsb_packet {
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/* This struct is basically read-only for hosts with the exception of
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* the data buffer contents and xnext - see below. */
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/* This can be used for host driver internal linking.
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*
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* NOTE: This must be left in init state when the driver is done
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* with it (e.g. by using list_del_init()), since the core does
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* some sanity checks to make sure the packet is not on a
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* driver_list when free'ing it. */
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struct list_head driver_list;
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nodeid_t node_id;
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/* Async and Iso types should be clear, raw means send-as-is, do not
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* CRC! Byte swapping shall still be done in this case. */
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enum { hpsb_async, hpsb_iso, hpsb_raw } __attribute__((packed)) type;
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/* Okay, this is core internal and a no care for hosts.
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* queued = queued for sending
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* pending = sent, waiting for response
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* complete = processing completed, successful or not
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*/
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enum {
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hpsb_unused, hpsb_queued, hpsb_pending, hpsb_complete
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} __attribute__((packed)) state;
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/* These are core internal. */
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signed char tlabel;
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signed char ack_code;
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unsigned char tcode;
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unsigned expect_response:1;
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unsigned no_waiter:1;
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/* Speed to transmit with: 0 = 100Mbps, 1 = 200Mbps, 2 = 400Mbps */
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unsigned speed_code:2;
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/*
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* *header and *data are guaranteed to be 32-bit DMAable and may be
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* overwritten to allow in-place byte swapping. Neither of these is
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* CRCed (the sizes also don't include CRC), but contain space for at
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* least one additional quadlet to allow in-place CRCing. The memory is
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* also guaranteed to be DMA mappable.
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*/
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quadlet_t *header;
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quadlet_t *data;
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size_t header_size;
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size_t data_size;
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struct hpsb_host *host;
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unsigned int generation;
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atomic_t refcnt;
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/* Function (and possible data to pass to it) to call when this
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* packet is completed. */
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void (*complete_routine)(void *);
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void *complete_data;
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/* XXX This is just a hack at the moment */
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struct sk_buff *skb;
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/* Store jiffies for implementing bus timeouts. */
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unsigned long sendtime;
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quadlet_t embedded_header[5];
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};
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/* Set a task for when a packet completes */
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void hpsb_set_packet_complete_task(struct hpsb_packet *packet,
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void (*routine)(void *), void *data);
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static inline struct hpsb_packet *driver_packet(struct list_head *l)
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{
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return list_entry(l, struct hpsb_packet, driver_list);
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}
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void abort_timedouts(unsigned long __opaque);
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struct hpsb_packet *hpsb_alloc_packet(size_t data_size);
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void hpsb_free_packet(struct hpsb_packet *packet);
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/*
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* Generation counter for the complete 1394 subsystem. Generation gets
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* incremented on every change in the subsystem (e.g. bus reset).
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*
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* Use the functions, not the variable.
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*/
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static inline unsigned int get_hpsb_generation(struct hpsb_host *host)
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{
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return atomic_read(&host->generation);
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}
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/*
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* Send a PHY configuration packet, return 0 on success, negative
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* errno on failure.
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*/
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int hpsb_send_phy_config(struct hpsb_host *host, int rootid, int gapcnt);
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/*
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* Queue packet for transmitting, return 0 on success, negative errno
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* on failure.
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*/
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int hpsb_send_packet(struct hpsb_packet *packet);
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/*
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* Queue packet for transmitting, and block until the transaction
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* completes. Return 0 on success, negative errno on failure.
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*/
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int hpsb_send_packet_and_wait(struct hpsb_packet *packet);
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/* Initiate bus reset on the given host. Returns 1 if bus reset already in
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* progress, 0 otherwise. */
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int hpsb_reset_bus(struct hpsb_host *host, int type);
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/*
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* The following functions are exported for host driver module usage. All of
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* them are safe to use in interrupt contexts, although some are quite
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* complicated so you may want to run them in bottom halves instead of calling
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* them directly.
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*/
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/* Notify a bus reset to the core. Returns 1 if bus reset already in progress,
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* 0 otherwise. */
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int hpsb_bus_reset(struct hpsb_host *host);
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/*
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* Hand over received selfid packet to the core. Complement check (second
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* quadlet is complement of first) is expected to be done and succesful.
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*/
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void hpsb_selfid_received(struct hpsb_host *host, quadlet_t sid);
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/*
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* Notify completion of SelfID stage to the core and report new physical ID
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* and whether host is root now.
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*/
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void hpsb_selfid_complete(struct hpsb_host *host, int phyid, int isroot);
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/*
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* Notify core of sending a packet. Ackcode is the ack code returned for async
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* transmits or ACKX_SEND_ERROR if the transmission failed completely; ACKX_NONE
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* for other cases (internal errors that don't justify a panic). Safe to call
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* from within a transmit packet routine.
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*/
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void hpsb_packet_sent(struct hpsb_host *host, struct hpsb_packet *packet,
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int ackcode);
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/*
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* Hand over received packet to the core. The contents of data are expected to
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* be the full packet but with the CRCs left out (data block follows header
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* immediately), with the header (i.e. the first four quadlets) in machine byte
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* order and the data block in big endian. *data can be safely overwritten
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* after this call.
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*
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* If the packet is a write request, write_acked is to be set to true if it was
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* ack_complete'd already, false otherwise. This arg is ignored for any other
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* packet type.
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*/
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void hpsb_packet_received(struct hpsb_host *host, quadlet_t *data, size_t size,
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int write_acked);
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/*
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* CHARACTER DEVICE DISPATCHING
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*
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* All ieee1394 character device drivers share the same major number
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* (major 171). The 256 minor numbers are allocated to the various
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* task-specific interfaces (raw1394, video1394, dv1394, etc) in
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* blocks of 16.
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*
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* The core ieee1394.o module allocates the device number region
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* 171:0-255, the various drivers must then cdev_add() their cdev
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* objects to handle their respective sub-regions.
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*
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* Minor device number block allocations:
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*
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* Block 0 ( 0- 15) raw1394
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* Block 1 ( 16- 31) video1394
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* Block 2 ( 32- 47) dv1394
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*
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* Blocks 3-14 free for future allocation
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*
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* Block 15 (240-255) reserved for drivers under development, etc.
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*/
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#define IEEE1394_MAJOR 171
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#define IEEE1394_MINOR_BLOCK_RAW1394 0
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#define IEEE1394_MINOR_BLOCK_VIDEO1394 1
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#define IEEE1394_MINOR_BLOCK_DV1394 2
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#define IEEE1394_MINOR_BLOCK_AMDTP 3
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#define IEEE1394_MINOR_BLOCK_EXPERIMENTAL 15
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#define IEEE1394_CORE_DEV MKDEV(IEEE1394_MAJOR, 0)
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#define IEEE1394_RAW1394_DEV MKDEV(IEEE1394_MAJOR, IEEE1394_MINOR_BLOCK_RAW1394 * 16)
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#define IEEE1394_VIDEO1394_DEV MKDEV(IEEE1394_MAJOR, IEEE1394_MINOR_BLOCK_VIDEO1394 * 16)
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#define IEEE1394_DV1394_DEV MKDEV(IEEE1394_MAJOR, IEEE1394_MINOR_BLOCK_DV1394 * 16)
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#define IEEE1394_AMDTP_DEV MKDEV(IEEE1394_MAJOR, IEEE1394_MINOR_BLOCK_AMDTP * 16)
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#define IEEE1394_EXPERIMENTAL_DEV MKDEV(IEEE1394_MAJOR, IEEE1394_MINOR_BLOCK_EXPERIMENTAL * 16)
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/* return the index (within a minor number block) of a file */
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static inline unsigned char ieee1394_file_to_instance(struct file *file)
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{
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return file->f_dentry->d_inode->i_cindex;
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}
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extern int hpsb_disable_irm;
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/* Our sysfs bus entry */
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extern struct bus_type ieee1394_bus_type;
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extern struct class hpsb_host_class;
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extern struct class *hpsb_protocol_class;
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#endif /* _IEEE1394_CORE_H */
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