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csr1212.h

/*
 * 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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