forked from luck/tmp_suning_uos_patched
17a19b795e
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>
389 lines
14 KiB
C
389 lines
14 KiB
C
/*
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* csr1212.h -- IEEE 1212 Control and Status Register support for Linux
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*
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* Copyright (C) 2003 Francois Retief <fgretief@sun.ac.za>
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* Steve Kinneberg <kinnebergsteve@acmsystems.com>
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are met:
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*
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* 1. Redistributions of source code must retain the above copyright notice,
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* this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. The name of the author may not be used to endorse or promote products
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* derived from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
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* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
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* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO
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* EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
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* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
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* OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
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* WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
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* OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
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* ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#ifndef __CSR1212_H__
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#define __CSR1212_H__
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#include <linux/types.h>
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#include <linux/slab.h>
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#include <asm/atomic.h>
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#define CSR1212_MALLOC(size) kmalloc((size), GFP_KERNEL)
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#define CSR1212_FREE(ptr) kfree(ptr)
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#define CSR1212_SUCCESS (0)
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/* CSR 1212 key types */
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#define CSR1212_KV_TYPE_IMMEDIATE 0
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#define CSR1212_KV_TYPE_CSR_OFFSET 1
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#define CSR1212_KV_TYPE_LEAF 2
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#define CSR1212_KV_TYPE_DIRECTORY 3
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/* CSR 1212 key ids */
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#define CSR1212_KV_ID_DESCRIPTOR 0x01
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#define CSR1212_KV_ID_BUS_DEPENDENT_INFO 0x02
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#define CSR1212_KV_ID_VENDOR 0x03
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#define CSR1212_KV_ID_HARDWARE_VERSION 0x04
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#define CSR1212_KV_ID_MODULE 0x07
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#define CSR1212_KV_ID_NODE_CAPABILITIES 0x0C
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#define CSR1212_KV_ID_EUI_64 0x0D
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#define CSR1212_KV_ID_UNIT 0x11
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#define CSR1212_KV_ID_SPECIFIER_ID 0x12
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#define CSR1212_KV_ID_VERSION 0x13
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#define CSR1212_KV_ID_DEPENDENT_INFO 0x14
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#define CSR1212_KV_ID_UNIT_LOCATION 0x15
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#define CSR1212_KV_ID_MODEL 0x17
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#define CSR1212_KV_ID_INSTANCE 0x18
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#define CSR1212_KV_ID_KEYWORD 0x19
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#define CSR1212_KV_ID_FEATURE 0x1A
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#define CSR1212_KV_ID_EXTENDED_ROM 0x1B
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#define CSR1212_KV_ID_EXTENDED_KEY_SPECIFIER_ID 0x1C
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#define CSR1212_KV_ID_EXTENDED_KEY 0x1D
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#define CSR1212_KV_ID_EXTENDED_DATA 0x1E
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#define CSR1212_KV_ID_MODIFIABLE_DESCRIPTOR 0x1F
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#define CSR1212_KV_ID_DIRECTORY_ID 0x20
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#define CSR1212_KV_ID_REVISION 0x21
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/* IEEE 1212 Address space map */
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#define CSR1212_ALL_SPACE_BASE (0x000000000000ULL)
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#define CSR1212_ALL_SPACE_SIZE (1ULL << 48)
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#define CSR1212_ALL_SPACE_END (CSR1212_ALL_SPACE_BASE + CSR1212_ALL_SPACE_SIZE)
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#define CSR1212_MEMORY_SPACE_BASE (0x000000000000ULL)
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#define CSR1212_MEMORY_SPACE_SIZE ((256ULL * (1ULL << 40)) - (512ULL * (1ULL << 20)))
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#define CSR1212_MEMORY_SPACE_END (CSR1212_MEMORY_SPACE_BASE + CSR1212_MEMORY_SPACE_SIZE)
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#define CSR1212_PRIVATE_SPACE_BASE (0xffffe0000000ULL)
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#define CSR1212_PRIVATE_SPACE_SIZE (256ULL * (1ULL << 20))
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#define CSR1212_PRIVATE_SPACE_END (CSR1212_PRIVATE_SPACE_BASE + CSR1212_PRIVATE_SPACE_SIZE)
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#define CSR1212_REGISTER_SPACE_BASE (0xfffff0000000ULL)
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#define CSR1212_REGISTER_SPACE_SIZE (256ULL * (1ULL << 20))
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#define CSR1212_REGISTER_SPACE_END (CSR1212_REGISTER_SPACE_BASE + CSR1212_REGISTER_SPACE_SIZE)
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#define CSR1212_CSR_ARCH_REG_SPACE_BASE (0xfffff0000000ULL)
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#define CSR1212_CSR_ARCH_REG_SPACE_SIZE (512)
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#define CSR1212_CSR_ARCH_REG_SPACE_END (CSR1212_CSR_ARCH_REG_SPACE_BASE + CSR1212_CSR_ARCH_REG_SPACE_SIZE)
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#define CSR1212_CSR_ARCH_REG_SPACE_OFFSET (CSR1212_CSR_ARCH_REG_SPACE_BASE - CSR1212_REGISTER_SPACE_BASE)
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#define CSR1212_CSR_BUS_DEP_REG_SPACE_BASE (0xfffff0000200ULL)
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#define CSR1212_CSR_BUS_DEP_REG_SPACE_SIZE (512)
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#define CSR1212_CSR_BUS_DEP_REG_SPACE_END (CSR1212_CSR_BUS_DEP_REG_SPACE_BASE + CSR1212_CSR_BUS_DEP_REG_SPACE_SIZE)
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#define CSR1212_CSR_BUS_DEP_REG_SPACE_OFFSET (CSR1212_CSR_BUS_DEP_REG_SPACE_BASE - CSR1212_REGISTER_SPACE_BASE)
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#define CSR1212_CONFIG_ROM_SPACE_BASE (0xfffff0000400ULL)
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#define CSR1212_CONFIG_ROM_SPACE_SIZE (1024)
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#define CSR1212_CONFIG_ROM_SPACE_END (CSR1212_CONFIG_ROM_SPACE_BASE + CSR1212_CONFIG_ROM_SPACE_SIZE)
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#define CSR1212_CONFIG_ROM_SPACE_OFFSET (CSR1212_CONFIG_ROM_SPACE_BASE - CSR1212_REGISTER_SPACE_BASE)
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#define CSR1212_UNITS_SPACE_BASE (0xfffff0000800ULL)
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#define CSR1212_UNITS_SPACE_SIZE ((256ULL * (1ULL << 20)) - 2048)
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#define CSR1212_UNITS_SPACE_END (CSR1212_UNITS_SPACE_BASE + CSR1212_UNITS_SPACE_SIZE)
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#define CSR1212_UNITS_SPACE_OFFSET (CSR1212_UNITS_SPACE_BASE - CSR1212_REGISTER_SPACE_BASE)
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#define CSR1212_INVALID_ADDR_SPACE -1
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/* Config ROM image structures */
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struct csr1212_bus_info_block_img {
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u8 length;
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u8 crc_length;
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u16 crc;
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/* Must be last */
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u32 data[0]; /* older gcc can't handle [] which is standard */
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};
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struct csr1212_leaf {
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int len;
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u32 *data;
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};
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struct csr1212_dentry {
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struct csr1212_dentry *next, *prev;
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struct csr1212_keyval *kv;
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};
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struct csr1212_directory {
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int len;
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struct csr1212_dentry *dentries_head, *dentries_tail;
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};
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struct csr1212_keyval {
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struct {
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u8 type;
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u8 id;
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} key;
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union {
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u32 immediate;
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u32 csr_offset;
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struct csr1212_leaf leaf;
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struct csr1212_directory directory;
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} value;
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struct csr1212_keyval *associate;
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atomic_t refcnt;
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/* used in generating and/or parsing CSR image */
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struct csr1212_keyval *next, *prev; /* flat list of CSR elements */
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u32 offset; /* position in CSR from 0xffff f000 0000 */
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u8 valid; /* flag indicating keyval has valid data*/
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};
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struct csr1212_cache_region {
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struct csr1212_cache_region *next, *prev;
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u32 offset_start; /* inclusive */
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u32 offset_end; /* exclusive */
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};
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struct csr1212_csr_rom_cache {
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struct csr1212_csr_rom_cache *next, *prev;
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struct csr1212_cache_region *filled_head, *filled_tail;
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struct csr1212_keyval *layout_head, *layout_tail;
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size_t size;
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u32 offset;
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struct csr1212_keyval *ext_rom;
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size_t len;
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/* Must be last */
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u32 data[0]; /* older gcc can't handle [] which is standard */
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};
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struct csr1212_csr {
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size_t bus_info_len; /* bus info block length in bytes */
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size_t crc_len; /* crc length in bytes */
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u32 *bus_info_data; /* bus info data incl bus name and EUI */
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void *private; /* private, bus specific data */
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struct csr1212_bus_ops *ops;
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struct csr1212_keyval *root_kv;
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int max_rom; /* max bytes readable in Config ROM region */
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/* Items below used for image parsing and generation */
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struct csr1212_csr_rom_cache *cache_head, *cache_tail;
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};
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struct csr1212_bus_ops {
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/* This function is used by csr1212 to read additional information
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* from remote nodes when parsing a Config ROM (i.e., read Config ROM
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* entries located in the Units Space. Must return 0 on success
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* anything else indicates an error. */
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int (*bus_read) (struct csr1212_csr *csr, u64 addr,
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u16 length, void *buffer, void *private);
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/* This function is used by csr1212 to allocate a region in units space
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* in the event that Config ROM entries don't all fit in the predefined
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* 1K region. The void *private parameter is private member of struct
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* csr1212_csr. */
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u64 (*allocate_addr_range) (u64 size, u32 alignment, void *private);
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/* This function is used by csr1212 to release a region in units space
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* that is no longer needed. */
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void (*release_addr) (u64 addr, void *private);
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/* This function is used by csr1212 to determine the max read request
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* supported by a remote node when reading the ConfigROM space. Must
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* return 0, 1, or 2 per IEEE 1212. */
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int (*get_max_rom) (u32 *bus_info, void *private);
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};
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/* Descriptor Leaf manipulation macros */
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#define CSR1212_DESCRIPTOR_LEAF_TYPE_SHIFT 24
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#define CSR1212_DESCRIPTOR_LEAF_SPECIFIER_ID_MASK 0xffffff
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#define CSR1212_DESCRIPTOR_LEAF_OVERHEAD (1 * sizeof(u32))
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#define CSR1212_DESCRIPTOR_LEAF_TYPE(kv) \
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(be32_to_cpu((kv)->value.leaf.data[0]) >> \
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CSR1212_DESCRIPTOR_LEAF_TYPE_SHIFT)
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#define CSR1212_DESCRIPTOR_LEAF_SPECIFIER_ID(kv) \
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(be32_to_cpu((kv)->value.leaf.data[0]) & \
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CSR1212_DESCRIPTOR_LEAF_SPECIFIER_ID_MASK)
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/* Text Descriptor Leaf manipulation macros */
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#define CSR1212_TEXTUAL_DESCRIPTOR_LEAF_WIDTH_SHIFT 28
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#define CSR1212_TEXTUAL_DESCRIPTOR_LEAF_WIDTH_MASK 0xf /* after shift */
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#define CSR1212_TEXTUAL_DESCRIPTOR_LEAF_CHAR_SET_SHIFT 16
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#define CSR1212_TEXTUAL_DESCRIPTOR_LEAF_CHAR_SET_MASK 0xfff /* after shift */
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#define CSR1212_TEXTUAL_DESCRIPTOR_LEAF_LANGUAGE_MASK 0xffff
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#define CSR1212_TEXTUAL_DESCRIPTOR_LEAF_OVERHEAD (1 * sizeof(u32))
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#define CSR1212_TEXTUAL_DESCRIPTOR_LEAF_WIDTH(kv) \
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(be32_to_cpu((kv)->value.leaf.data[1]) >> \
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CSR1212_TEXTUAL_DESCRIPTOR_LEAF_WIDTH_SHIFT)
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#define CSR1212_TEXTUAL_DESCRIPTOR_LEAF_CHAR_SET(kv) \
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((be32_to_cpu((kv)->value.leaf.data[1]) >> \
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CSR1212_TEXTUAL_DESCRIPTOR_LEAF_CHAR_SET_SHIFT) & \
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CSR1212_TEXTUAL_DESCRIPTOR_LEAF_CHAR_SET_MASK)
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#define CSR1212_TEXTUAL_DESCRIPTOR_LEAF_LANGUAGE(kv) \
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(be32_to_cpu((kv)->value.leaf.data[1]) & \
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CSR1212_TEXTUAL_DESCRIPTOR_LEAF_LANGUAGE_MASK)
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#define CSR1212_TEXTUAL_DESCRIPTOR_LEAF_DATA(kv) \
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(&((kv)->value.leaf.data[2]))
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/* The following 2 function are for creating new Configuration ROM trees. The
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* first function is used for both creating local trees and parsing remote
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* trees. The second function adds pertinent information to local Configuration
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* ROM trees - namely data for the bus information block. */
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extern struct csr1212_csr *csr1212_create_csr(struct csr1212_bus_ops *ops,
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size_t bus_info_size,
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void *private);
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extern void csr1212_init_local_csr(struct csr1212_csr *csr,
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const u32 *bus_info_data, int max_rom);
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/* Destroy a Configuration ROM tree and release all memory taken by the tree. */
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extern void csr1212_destroy_csr(struct csr1212_csr *csr);
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/* The following set of functions are fore creating new keyvals for placement in
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* a Configuration ROM tree. Code that creates new keyvals with these functions
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* must release those keyvals with csr1212_release_keyval() when they are no
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* longer needed. */
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extern struct csr1212_keyval *csr1212_new_immediate(u8 key, u32 value);
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extern struct csr1212_keyval *csr1212_new_directory(u8 key);
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extern struct csr1212_keyval *csr1212_new_string_descriptor_leaf(const char *s);
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/* The following function manages association between keyvals. Typically,
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* Descriptor Leaves and Directories will be associated with another keyval and
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* it is desirable for the Descriptor keyval to be place immediately after the
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* keyval that it is associated with.
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* Take care with subsequent ROM modifications: There is no function to remove
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* previously specified associations.
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*/
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extern void csr1212_associate_keyval(struct csr1212_keyval *kv,
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struct csr1212_keyval *associate);
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/* The following functions manage the association of a keyval and directories.
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* A keyval may be attached to more than one directory. */
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extern int csr1212_attach_keyval_to_directory(struct csr1212_keyval *dir,
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struct csr1212_keyval *kv);
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extern void csr1212_detach_keyval_from_directory(struct csr1212_keyval *dir,
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struct csr1212_keyval *kv);
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/* Creates a complete Configuration ROM image in the list of caches available
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* via csr->cache_head. */
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extern int csr1212_generate_csr_image(struct csr1212_csr *csr);
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/* This is a convience function for reading a block of data out of one of the
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* caches in the csr->cache_head list. */
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extern int csr1212_read(struct csr1212_csr *csr, u32 offset, void *buffer,
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u32 len);
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/* The following functions are in place for parsing Configuration ROM images.
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* csr1212_parse_keyval() is used should there be a need to directly parse a
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* Configuration ROM directly. */
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extern int csr1212_parse_keyval(struct csr1212_keyval *kv,
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struct csr1212_csr_rom_cache *cache);
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extern int csr1212_parse_csr(struct csr1212_csr *csr);
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/* This function allocates a new cache which may be used for either parsing or
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* generating sub-sets of Configuration ROM images. */
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static inline struct csr1212_csr_rom_cache *
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csr1212_rom_cache_malloc(u32 offset, size_t size)
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{
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struct csr1212_csr_rom_cache *cache;
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cache = CSR1212_MALLOC(sizeof(*cache) + size);
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if (!cache)
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return NULL;
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cache->next = NULL;
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cache->prev = NULL;
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cache->filled_head = NULL;
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cache->filled_tail = NULL;
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cache->layout_head = NULL;
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cache->layout_tail = NULL;
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cache->offset = offset;
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cache->size = size;
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cache->ext_rom = NULL;
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return cache;
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}
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/* This function ensures that a keyval contains data when referencing a keyval
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* created by parsing a Configuration ROM. */
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extern struct csr1212_keyval *
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csr1212_get_keyval(struct csr1212_csr *csr, struct csr1212_keyval *kv);
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/* This function increments the reference count for a keyval should there be a
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* need for code to retain a keyval that has been parsed. */
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static inline void csr1212_keep_keyval(struct csr1212_keyval *kv)
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{
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atomic_inc(&kv->refcnt);
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smp_mb__after_atomic_inc();
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}
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/* This function decrements a keyval's reference count and will destroy the
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* keyval when there are no more users of the keyval. This should be called by
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* any code that calls csr1212_keep_keyval() or any of the keyval creation
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* routines csr1212_new_*(). */
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extern void csr1212_release_keyval(struct csr1212_keyval *kv);
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/*
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* This macro allows for looping over the keyval entries in a directory and it
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* ensures that keyvals from remote ConfigROMs are parsed properly.
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*
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* struct csr1212_csr *_csr points to the CSR associated with dir.
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* struct csr1212_keyval *_kv points to the current keyval (loop index).
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* struct csr1212_keyval *_dir points to the directory to be looped.
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* struct csr1212_dentry *_pos is used internally for indexing.
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*
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* kv will be NULL upon exit of the loop.
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*/
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#define csr1212_for_each_dir_entry(_csr, _kv, _dir, _pos) \
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for (csr1212_get_keyval((_csr), (_dir)), \
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_pos = (_dir)->value.directory.dentries_head, \
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_kv = (_pos) ? csr1212_get_keyval((_csr), _pos->kv) : NULL;\
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(_kv) && (_pos); \
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(_kv->associate == NULL) ? \
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((_pos = _pos->next), (_kv = (_pos) ? \
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csr1212_get_keyval((_csr), _pos->kv) : \
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NULL)) : \
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(_kv = csr1212_get_keyval((_csr), _kv->associate)))
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#endif /* __CSR1212_H__ */
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