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tmp_suning_uos_patched/drivers/ieee1394/csr1212.h
Stefan Richter 17a19b795e ieee1394: csr1212: proper refcounting 
At least since nodemgr got rid of coarse global locking, accesses to
struct csr1212_keyval's reference counter should be atomic and coupled
with proper barriers.  Also, calls to csr1212_keep_keyval(kv) should
occur before kv is being used.

(We probably should convert refcnt to struct kref, but how to keep
csr1212_destroy_keyval's implementation non-recursively then?)

Signed-off-by: Stefan Richter <stefanr@s5r6.in-berlin.de>
2007-10-16 23:59:59 +02:00

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/*
* csr1212.h -- IEEE 1212 Control and Status Register support for Linux
*
* Copyright (C) 2003 Francois Retief <fgretief@sun.ac.za>
* Steve Kinneberg <kinnebergsteve@acmsystems.com>
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
*
* 1. Redistributions of source code must retain the above copyright notice,
* this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. The name of the author may not be used to endorse or promote products
* derived from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO
* EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
* OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
* WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
* OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
* ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#ifndef __CSR1212_H__
#define __CSR1212_H__
#include <linux/types.h>
#include <linux/slab.h>
#include <asm/atomic.h>
#define CSR1212_MALLOC(size) kmalloc((size), GFP_KERNEL)
#define CSR1212_FREE(ptr) kfree(ptr)
#define CSR1212_SUCCESS (0)
/* CSR 1212 key types */
#define CSR1212_KV_TYPE_IMMEDIATE 0
#define CSR1212_KV_TYPE_CSR_OFFSET 1
#define CSR1212_KV_TYPE_LEAF 2
#define CSR1212_KV_TYPE_DIRECTORY 3
/* CSR 1212 key ids */
#define CSR1212_KV_ID_DESCRIPTOR 0x01
#define CSR1212_KV_ID_BUS_DEPENDENT_INFO 0x02
#define CSR1212_KV_ID_VENDOR 0x03
#define CSR1212_KV_ID_HARDWARE_VERSION 0x04
#define CSR1212_KV_ID_MODULE 0x07
#define CSR1212_KV_ID_NODE_CAPABILITIES 0x0C
#define CSR1212_KV_ID_EUI_64 0x0D
#define CSR1212_KV_ID_UNIT 0x11
#define CSR1212_KV_ID_SPECIFIER_ID 0x12
#define CSR1212_KV_ID_VERSION 0x13
#define CSR1212_KV_ID_DEPENDENT_INFO 0x14
#define CSR1212_KV_ID_UNIT_LOCATION 0x15
#define CSR1212_KV_ID_MODEL 0x17
#define CSR1212_KV_ID_INSTANCE 0x18
#define CSR1212_KV_ID_KEYWORD 0x19
#define CSR1212_KV_ID_FEATURE 0x1A
#define CSR1212_KV_ID_EXTENDED_ROM 0x1B
#define CSR1212_KV_ID_EXTENDED_KEY_SPECIFIER_ID 0x1C
#define CSR1212_KV_ID_EXTENDED_KEY 0x1D
#define CSR1212_KV_ID_EXTENDED_DATA 0x1E
#define CSR1212_KV_ID_MODIFIABLE_DESCRIPTOR 0x1F
#define CSR1212_KV_ID_DIRECTORY_ID 0x20
#define CSR1212_KV_ID_REVISION 0x21
/* IEEE 1212 Address space map */
#define CSR1212_ALL_SPACE_BASE (0x000000000000ULL)
#define CSR1212_ALL_SPACE_SIZE (1ULL << 48)
#define CSR1212_ALL_SPACE_END (CSR1212_ALL_SPACE_BASE + CSR1212_ALL_SPACE_SIZE)
#define CSR1212_MEMORY_SPACE_BASE (0x000000000000ULL)
#define CSR1212_MEMORY_SPACE_SIZE ((256ULL * (1ULL << 40)) - (512ULL * (1ULL << 20)))
#define CSR1212_MEMORY_SPACE_END (CSR1212_MEMORY_SPACE_BASE + CSR1212_MEMORY_SPACE_SIZE)
#define CSR1212_PRIVATE_SPACE_BASE (0xffffe0000000ULL)
#define CSR1212_PRIVATE_SPACE_SIZE (256ULL * (1ULL << 20))
#define CSR1212_PRIVATE_SPACE_END (CSR1212_PRIVATE_SPACE_BASE + CSR1212_PRIVATE_SPACE_SIZE)
#define CSR1212_REGISTER_SPACE_BASE (0xfffff0000000ULL)
#define CSR1212_REGISTER_SPACE_SIZE (256ULL * (1ULL << 20))
#define CSR1212_REGISTER_SPACE_END (CSR1212_REGISTER_SPACE_BASE + CSR1212_REGISTER_SPACE_SIZE)
#define CSR1212_CSR_ARCH_REG_SPACE_BASE (0xfffff0000000ULL)
#define CSR1212_CSR_ARCH_REG_SPACE_SIZE (512)
#define CSR1212_CSR_ARCH_REG_SPACE_END (CSR1212_CSR_ARCH_REG_SPACE_BASE + CSR1212_CSR_ARCH_REG_SPACE_SIZE)
#define CSR1212_CSR_ARCH_REG_SPACE_OFFSET (CSR1212_CSR_ARCH_REG_SPACE_BASE - CSR1212_REGISTER_SPACE_BASE)
#define CSR1212_CSR_BUS_DEP_REG_SPACE_BASE (0xfffff0000200ULL)
#define CSR1212_CSR_BUS_DEP_REG_SPACE_SIZE (512)
#define CSR1212_CSR_BUS_DEP_REG_SPACE_END (CSR1212_CSR_BUS_DEP_REG_SPACE_BASE + CSR1212_CSR_BUS_DEP_REG_SPACE_SIZE)
#define CSR1212_CSR_BUS_DEP_REG_SPACE_OFFSET (CSR1212_CSR_BUS_DEP_REG_SPACE_BASE - CSR1212_REGISTER_SPACE_BASE)
#define CSR1212_CONFIG_ROM_SPACE_BASE (0xfffff0000400ULL)
#define CSR1212_CONFIG_ROM_SPACE_SIZE (1024)
#define CSR1212_CONFIG_ROM_SPACE_END (CSR1212_CONFIG_ROM_SPACE_BASE + CSR1212_CONFIG_ROM_SPACE_SIZE)
#define CSR1212_CONFIG_ROM_SPACE_OFFSET (CSR1212_CONFIG_ROM_SPACE_BASE - CSR1212_REGISTER_SPACE_BASE)
#define CSR1212_UNITS_SPACE_BASE (0xfffff0000800ULL)
#define CSR1212_UNITS_SPACE_SIZE ((256ULL * (1ULL << 20)) - 2048)
#define CSR1212_UNITS_SPACE_END (CSR1212_UNITS_SPACE_BASE + CSR1212_UNITS_SPACE_SIZE)
#define CSR1212_UNITS_SPACE_OFFSET (CSR1212_UNITS_SPACE_BASE - CSR1212_REGISTER_SPACE_BASE)
#define CSR1212_INVALID_ADDR_SPACE -1
/* Config ROM image structures */
struct csr1212_bus_info_block_img {
u8 length;
u8 crc_length;
u16 crc;
/* Must be last */
u32 data[0]; /* older gcc can't handle [] which is standard */
};
struct csr1212_leaf {
int len;
u32 *data;
};
struct csr1212_dentry {
struct csr1212_dentry *next, *prev;
struct csr1212_keyval *kv;
};
struct csr1212_directory {
int len;
struct csr1212_dentry *dentries_head, *dentries_tail;
};
struct csr1212_keyval {
struct {
u8 type;
u8 id;
} key;
union {
u32 immediate;
u32 csr_offset;
struct csr1212_leaf leaf;
struct csr1212_directory directory;
} value;
struct csr1212_keyval *associate;
atomic_t refcnt;
/* used in generating and/or parsing CSR image */
struct csr1212_keyval *next, *prev; /* flat list of CSR elements */
u32 offset; /* position in CSR from 0xffff f000 0000 */
u8 valid; /* flag indicating keyval has valid data*/
};
struct csr1212_cache_region {
struct csr1212_cache_region *next, *prev;
u32 offset_start; /* inclusive */
u32 offset_end; /* exclusive */
};
struct csr1212_csr_rom_cache {
struct csr1212_csr_rom_cache *next, *prev;
struct csr1212_cache_region *filled_head, *filled_tail;
struct csr1212_keyval *layout_head, *layout_tail;
size_t size;
u32 offset;
struct csr1212_keyval *ext_rom;
size_t len;
/* Must be last */
u32 data[0]; /* older gcc can't handle [] which is standard */
};
struct csr1212_csr {
size_t bus_info_len; /* bus info block length in bytes */
size_t crc_len; /* crc length in bytes */
u32 *bus_info_data; /* bus info data incl bus name and EUI */
void *private; /* private, bus specific data */
struct csr1212_bus_ops *ops;
struct csr1212_keyval *root_kv;
int max_rom; /* max bytes readable in Config ROM region */
/* Items below used for image parsing and generation */
struct csr1212_csr_rom_cache *cache_head, *cache_tail;
};
struct csr1212_bus_ops {
/* This function is used by csr1212 to read additional information
* from remote nodes when parsing a Config ROM (i.e., read Config ROM
* entries located in the Units Space. Must return 0 on success
* anything else indicates an error. */
int (*bus_read) (struct csr1212_csr *csr, u64 addr,
u16 length, void *buffer, void *private);
/* This function is used by csr1212 to allocate a region in units space
* in the event that Config ROM entries don't all fit in the predefined
* 1K region. The void *private parameter is private member of struct
* csr1212_csr. */
u64 (*allocate_addr_range) (u64 size, u32 alignment, void *private);
/* This function is used by csr1212 to release a region in units space
* that is no longer needed. */
void (*release_addr) (u64 addr, void *private);
/* This function is used by csr1212 to determine the max read request
* supported by a remote node when reading the ConfigROM space. Must
* return 0, 1, or 2 per IEEE 1212. */
int (*get_max_rom) (u32 *bus_info, void *private);
};
/* Descriptor Leaf manipulation macros */
#define CSR1212_DESCRIPTOR_LEAF_TYPE_SHIFT 24
#define CSR1212_DESCRIPTOR_LEAF_SPECIFIER_ID_MASK 0xffffff
#define CSR1212_DESCRIPTOR_LEAF_OVERHEAD (1 * sizeof(u32))
#define CSR1212_DESCRIPTOR_LEAF_TYPE(kv) \
(be32_to_cpu((kv)->value.leaf.data[0]) >> \
CSR1212_DESCRIPTOR_LEAF_TYPE_SHIFT)
#define CSR1212_DESCRIPTOR_LEAF_SPECIFIER_ID(kv) \
(be32_to_cpu((kv)->value.leaf.data[0]) & \
CSR1212_DESCRIPTOR_LEAF_SPECIFIER_ID_MASK)
/* Text Descriptor Leaf manipulation macros */
#define CSR1212_TEXTUAL_DESCRIPTOR_LEAF_WIDTH_SHIFT 28
#define CSR1212_TEXTUAL_DESCRIPTOR_LEAF_WIDTH_MASK 0xf /* after shift */
#define CSR1212_TEXTUAL_DESCRIPTOR_LEAF_CHAR_SET_SHIFT 16
#define CSR1212_TEXTUAL_DESCRIPTOR_LEAF_CHAR_SET_MASK 0xfff /* after shift */
#define CSR1212_TEXTUAL_DESCRIPTOR_LEAF_LANGUAGE_MASK 0xffff
#define CSR1212_TEXTUAL_DESCRIPTOR_LEAF_OVERHEAD (1 * sizeof(u32))
#define CSR1212_TEXTUAL_DESCRIPTOR_LEAF_WIDTH(kv) \
(be32_to_cpu((kv)->value.leaf.data[1]) >> \
CSR1212_TEXTUAL_DESCRIPTOR_LEAF_WIDTH_SHIFT)
#define CSR1212_TEXTUAL_DESCRIPTOR_LEAF_CHAR_SET(kv) \
((be32_to_cpu((kv)->value.leaf.data[1]) >> \
CSR1212_TEXTUAL_DESCRIPTOR_LEAF_CHAR_SET_SHIFT) & \
CSR1212_TEXTUAL_DESCRIPTOR_LEAF_CHAR_SET_MASK)
#define CSR1212_TEXTUAL_DESCRIPTOR_LEAF_LANGUAGE(kv) \
(be32_to_cpu((kv)->value.leaf.data[1]) & \
CSR1212_TEXTUAL_DESCRIPTOR_LEAF_LANGUAGE_MASK)
#define CSR1212_TEXTUAL_DESCRIPTOR_LEAF_DATA(kv) \
(&((kv)->value.leaf.data[2]))
/* The following 2 function are for creating new Configuration ROM trees. The
* first function is used for both creating local trees and parsing remote
* trees. The second function adds pertinent information to local Configuration
* ROM trees - namely data for the bus information block. */
extern struct csr1212_csr *csr1212_create_csr(struct csr1212_bus_ops *ops,
size_t bus_info_size,
void *private);
extern void csr1212_init_local_csr(struct csr1212_csr *csr,
const u32 *bus_info_data, int max_rom);
/* Destroy a Configuration ROM tree and release all memory taken by the tree. */
extern void csr1212_destroy_csr(struct csr1212_csr *csr);
/* The following set of functions are fore creating new keyvals for placement in
* a Configuration ROM tree. Code that creates new keyvals with these functions
* must release those keyvals with csr1212_release_keyval() when they are no
* longer needed. */
extern struct csr1212_keyval *csr1212_new_immediate(u8 key, u32 value);
extern struct csr1212_keyval *csr1212_new_directory(u8 key);
extern struct csr1212_keyval *csr1212_new_string_descriptor_leaf(const char *s);
/* The following function manages association between keyvals. Typically,
* Descriptor Leaves and Directories will be associated with another keyval and
* it is desirable for the Descriptor keyval to be place immediately after the
* keyval that it is associated with.
* Take care with subsequent ROM modifications: There is no function to remove
* previously specified associations.
*/
extern void csr1212_associate_keyval(struct csr1212_keyval *kv,
struct csr1212_keyval *associate);
/* The following functions manage the association of a keyval and directories.
* A keyval may be attached to more than one directory. */
extern int csr1212_attach_keyval_to_directory(struct csr1212_keyval *dir,
struct csr1212_keyval *kv);
extern void csr1212_detach_keyval_from_directory(struct csr1212_keyval *dir,
struct csr1212_keyval *kv);
/* Creates a complete Configuration ROM image in the list of caches available
* via csr->cache_head. */
extern int csr1212_generate_csr_image(struct csr1212_csr *csr);
/* This is a convience function for reading a block of data out of one of the
* caches in the csr->cache_head list. */
extern int csr1212_read(struct csr1212_csr *csr, u32 offset, void *buffer,
u32 len);
/* The following functions are in place for parsing Configuration ROM images.
* csr1212_parse_keyval() is used should there be a need to directly parse a
* Configuration ROM directly. */
extern int csr1212_parse_keyval(struct csr1212_keyval *kv,
struct csr1212_csr_rom_cache *cache);
extern int csr1212_parse_csr(struct csr1212_csr *csr);
/* This function allocates a new cache which may be used for either parsing or
* generating sub-sets of Configuration ROM images. */
static inline struct csr1212_csr_rom_cache *
csr1212_rom_cache_malloc(u32 offset, size_t size)
{
struct csr1212_csr_rom_cache *cache;
cache = CSR1212_MALLOC(sizeof(*cache) + size);
if (!cache)
return NULL;
cache->next = NULL;
cache->prev = NULL;
cache->filled_head = NULL;
cache->filled_tail = NULL;
cache->layout_head = NULL;
cache->layout_tail = NULL;
cache->offset = offset;
cache->size = size;
cache->ext_rom = NULL;
return cache;
}
/* This function ensures that a keyval contains data when referencing a keyval
* created by parsing a Configuration ROM. */
extern struct csr1212_keyval *
csr1212_get_keyval(struct csr1212_csr *csr, struct csr1212_keyval *kv);
/* This function increments the reference count for a keyval should there be a
* need for code to retain a keyval that has been parsed. */
static inline void csr1212_keep_keyval(struct csr1212_keyval *kv)
{
atomic_inc(&kv->refcnt);
smp_mb__after_atomic_inc();
}
/* This function decrements a keyval's reference count and will destroy the
* keyval when there are no more users of the keyval. This should be called by
* any code that calls csr1212_keep_keyval() or any of the keyval creation
* routines csr1212_new_*(). */
extern void csr1212_release_keyval(struct csr1212_keyval *kv);
/*
* This macro allows for looping over the keyval entries in a directory and it
* ensures that keyvals from remote ConfigROMs are parsed properly.
*
* struct csr1212_csr *_csr points to the CSR associated with dir.
* struct csr1212_keyval *_kv points to the current keyval (loop index).
* struct csr1212_keyval *_dir points to the directory to be looped.
* struct csr1212_dentry *_pos is used internally for indexing.
*
* kv will be NULL upon exit of the loop.
*/
#define csr1212_for_each_dir_entry(_csr, _kv, _dir, _pos) \
for (csr1212_get_keyval((_csr), (_dir)), \
_pos = (_dir)->value.directory.dentries_head, \
_kv = (_pos) ? csr1212_get_keyval((_csr), _pos->kv) : NULL;\
(_kv) && (_pos); \
(_kv->associate == NULL) ? \
((_pos = _pos->next), (_kv = (_pos) ? \
csr1212_get_keyval((_csr), _pos->kv) : \
NULL)) : \
(_kv = csr1212_get_keyval((_csr), _kv->associate)))
#endif /* __CSR1212_H__ */
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