arch/ia64/include/asm/sn/bte.h

   1 /*
   2  * This file is subject to the terms and conditions of the GNU General Public
   3  * License.  See the file "COPYING" in the main directory of this archive
   4  * for more details.
   5  *
   6  * Copyright (c) 2000-2007 Silicon Graphics, Inc.  All Rights Reserved.
   7  */
   8
   9
  10 #ifndef _ASM_IA64_SN_BTE_H
  11 #define _ASM_IA64_SN_BTE_H
  12
  13 #include <linux/timer.h>
  14 #include <linux/spinlock.h>
  15 #include <linux/cache.h>
  16 #include <asm/sn/pda.h>
  17 #include <asm/sn/types.h>
  18 #include <asm/sn/shub_mmr.h>
  19
  20 #define IBCT_NOTIFY             (0x1UL << 4)
  21 #define IBCT_ZFIL_MODE          (0x1UL << 0)
  22
  23 /* #define BTE_DEBUG */
  24 /* #define BTE_DEBUG_VERBOSE */
  25
  26 #ifdef BTE_DEBUG
  27 #  define BTE_PRINTK(x) printk x        /* Terse */
  28 #  ifdef BTE_DEBUG_VERBOSE
  29 #    define BTE_PRINTKV(x) printk x     /* Verbose */
  30 #  else
  31 #    define BTE_PRINTKV(x)
  32 #  endif /* BTE_DEBUG_VERBOSE */
  33 #else
  34 #  define BTE_PRINTK(x)
  35 #  define BTE_PRINTKV(x)
  36 #endif  /* BTE_DEBUG */
  37
  38
  39 /* BTE status register only supports 16 bits for length field */
  40 #define BTE_LEN_BITS (16)
  41 #define BTE_LEN_MASK ((1 << BTE_LEN_BITS) - 1)
  42 #define BTE_MAX_XFER (BTE_LEN_MASK << L1_CACHE_SHIFT)
  43
  44
  45 /* Define hardware */
  46 #define BTES_PER_NODE (is_shub2() ? 4 : 2)
  47 #define MAX_BTES_PER_NODE 4
  48
  49 #define BTE2OFF_CTRL    0
  50 #define BTE2OFF_SRC     (SH2_BT_ENG_SRC_ADDR_0 - SH2_BT_ENG_CSR_0)
  51 #define BTE2OFF_DEST    (SH2_BT_ENG_DEST_ADDR_0 - SH2_BT_ENG_CSR_0)
  52 #define BTE2OFF_NOTIFY  (SH2_BT_ENG_NOTIF_ADDR_0 - SH2_BT_ENG_CSR_0)
  53
  54 #define BTE_BASE_ADDR(interface)                                \
  55     (is_shub2() ? (interface == 0) ? SH2_BT_ENG_CSR_0 :         \
  56                   (interface == 1) ? SH2_BT_ENG_CSR_1 :         \
  57                   (interface == 2) ? SH2_BT_ENG_CSR_2 :         \
  58                                      SH2_BT_ENG_CSR_3           \
  59                 : (interface == 0) ? IIO_IBLS0 : IIO_IBLS1)
  60
  61 #define BTE_SOURCE_ADDR(base)                                   \
  62     (is_shub2() ? base + (BTE2OFF_SRC/8)                        \
  63                 : base + (BTEOFF_SRC/8))
  64
  65 #define BTE_DEST_ADDR(base)                                     \
  66     (is_shub2() ? base + (BTE2OFF_DEST/8)                       \
  67                 : base + (BTEOFF_DEST/8))
  68
  69 #define BTE_CTRL_ADDR(base)                                     \
  70     (is_shub2() ? base + (BTE2OFF_CTRL/8)                       \
  71                 : base + (BTEOFF_CTRL/8))
  72
  73 #define BTE_NOTIF_ADDR(base)                                    \
  74     (is_shub2() ? base + (BTE2OFF_NOTIFY/8)                     \
  75                 : base + (BTEOFF_NOTIFY/8))
  76
  77 /* Define hardware modes */
  78 #define BTE_NOTIFY IBCT_NOTIFY
  79 #define BTE_NORMAL BTE_NOTIFY
  80 #define BTE_ZERO_FILL (BTE_NOTIFY | IBCT_ZFIL_MODE)
  81 /* Use a reserved bit to let the caller specify a wait for any BTE */
  82 #define BTE_WACQUIRE 0x4000
  83 /* Use the BTE on the node with the destination memory */
  84 #define BTE_USE_DEST (BTE_WACQUIRE << 1)
  85 /* Use any available BTE interface on any node for the transfer */
  86 #define BTE_USE_ANY (BTE_USE_DEST << 1)
  87 /* macro to force the IBCT0 value valid */
  88 #define BTE_VALID_MODE(x) ((x) & (IBCT_NOTIFY | IBCT_ZFIL_MODE))
  89
  90 #define BTE_ACTIVE              (IBLS_BUSY | IBLS_ERROR)
  91 #define BTE_WORD_AVAILABLE      (IBLS_BUSY << 1)
  92 #define BTE_WORD_BUSY           (~BTE_WORD_AVAILABLE)
  93
  94 /*
  95  * Some macros to simplify reading.
  96  * Start with macros to locate the BTE control registers.
  97  */
  98 #define BTE_LNSTAT_LOAD(_bte)                                           \
  99                         HUB_L(_bte->bte_base_addr)
 100 #define BTE_LNSTAT_STORE(_bte, _x)                                      \
 101                         HUB_S(_bte->bte_base_addr, (_x))
 102 #define BTE_SRC_STORE(_bte, _x)                                         \
 103 ({                                                                      \
 104                 u64 __addr = ((_x) & ~AS_MASK);                         \
 105                 if (is_shub2())                                         \
 106                         __addr = SH2_TIO_PHYS_TO_DMA(__addr);           \
 107                 HUB_S(_bte->bte_source_addr, __addr);                   \
 108 })
 109 #define BTE_DEST_STORE(_bte, _x)                                        \
 110 ({                                                                      \
 111                 u64 __addr = ((_x) & ~AS_MASK);                         \
 112                 if (is_shub2())                                         \
 113                         __addr = SH2_TIO_PHYS_TO_DMA(__addr);           \
 114                 HUB_S(_bte->bte_destination_addr, __addr);              \
 115 })
 116 #define BTE_CTRL_STORE(_bte, _x)                                        \
 117                         HUB_S(_bte->bte_control_addr, (_x))
 118 #define BTE_NOTIF_STORE(_bte, _x)                                       \
 119 ({                                                                      \
 120                 u64 __addr = ia64_tpa((_x) & ~AS_MASK);                 \
 121                 if (is_shub2())                                         \
 122                         __addr = SH2_TIO_PHYS_TO_DMA(__addr);           \
 123                 HUB_S(_bte->bte_notify_addr, __addr);                   \
 124 })
 125
 126 #define BTE_START_TRANSFER(_bte, _len, _mode)                           \
 127         is_shub2() ? BTE_CTRL_STORE(_bte, IBLS_BUSY | (_mode << 24) | _len) \
 128                 : BTE_LNSTAT_STORE(_bte, _len);                         \
 129                   BTE_CTRL_STORE(_bte, _mode)
 130
 131 /* Possible results from bte_copy and bte_unaligned_copy */
 132 /* The following error codes map into the BTE hardware codes
 133  * IIO_ICRB_ECODE_* (in shubio.h). The hardware uses
 134  * an error code of 0 (IIO_ICRB_ECODE_DERR), but we want zero
 135  * to mean BTE_SUCCESS, so add one (BTEFAIL_OFFSET) to the error
 136  * codes to give the following error codes.
 137  */
 138 #define BTEFAIL_OFFSET  1
 139
 140 typedef enum {
 141         BTE_SUCCESS,            /* 0 is success */
 142         BTEFAIL_DIR,            /* Directory error due to IIO access*/
 143         BTEFAIL_POISON,         /* poison error on IO access (write to poison page) */
 144         BTEFAIL_WERR,           /* Write error (ie WINV to a Read only line) */
 145         BTEFAIL_ACCESS,         /* access error (protection violation) */
 146         BTEFAIL_PWERR,          /* Partial Write Error */
 147         BTEFAIL_PRERR,          /* Partial Read Error */
 148         BTEFAIL_TOUT,           /* CRB Time out */
 149         BTEFAIL_XTERR,          /* Incoming xtalk pkt had error bit */
 150         BTEFAIL_NOTAVAIL,       /* BTE not available */
 151 } bte_result_t;
 152
 153 #define BTEFAIL_SH2_RESP_SHORT  0x1     /* bit 000001 */
 154 #define BTEFAIL_SH2_RESP_LONG   0x2     /* bit 000010 */
 155 #define BTEFAIL_SH2_RESP_DSP    0x4     /* bit 000100 */
 156 #define BTEFAIL_SH2_RESP_ACCESS 0x8     /* bit 001000 */
 157 #define BTEFAIL_SH2_CRB_TO      0x10    /* bit 010000 */
 158 #define BTEFAIL_SH2_NACK_LIMIT  0x20    /* bit 100000 */
 159 #define BTEFAIL_SH2_ALL         0x3F    /* bit 111111 */
 160
 161 #define BTE_ERR_BITS    0x3FUL
 162 #define BTE_ERR_SHIFT   36
 163 #define BTE_ERR_MASK    (BTE_ERR_BITS << BTE_ERR_SHIFT)
 164
 165 #define BTE_ERROR_RETRY(value)                                          \
 166         (is_shub2() ? (value != BTEFAIL_SH2_CRB_TO)                     \
 167                 : (value != BTEFAIL_TOUT))
 168
 169 /*
 170  * On shub1 BTE_ERR_MASK will always be false, so no need for is_shub2()
 171  */
 172 #define BTE_SHUB2_ERROR(_status)                                        \
 173         ((_status & BTE_ERR_MASK)                                       \
 174            ? (((_status >> BTE_ERR_SHIFT) & BTE_ERR_BITS) | IBLS_ERROR) \
 175            : _status)
 176
 177 #define BTE_GET_ERROR_STATUS(_status)                                   \
 178         (BTE_SHUB2_ERROR(_status) & ~IBLS_ERROR)
 179
 180 #define BTE_VALID_SH2_ERROR(value)                                      \
 181         ((value >= BTEFAIL_SH2_RESP_SHORT) && (value <= BTEFAIL_SH2_ALL))
 182
 183 /*
 184  * Structure defining a bte.  An instance of this
 185  * structure is created in the nodepda for each
 186  * bte on that node (as defined by BTES_PER_NODE)
 187  * This structure contains everything necessary
 188  * to work with a BTE.
 189  */
 190 struct bteinfo_s {
 191         volatile u64 notify ____cacheline_aligned;
 192         u64 *bte_base_addr ____cacheline_aligned;
 193         u64 *bte_source_addr;
 194         u64 *bte_destination_addr;
 195         u64 *bte_control_addr;
 196         u64 *bte_notify_addr;
 197         spinlock_t spinlock;
 198         cnodeid_t bte_cnode;    /* cnode                            */
 199         int bte_error_count;    /* Number of errors encountered     */
 200         int bte_num;            /* 0 --> BTE0, 1 --> BTE1           */
 201         int cleanup_active;     /* Interface is locked for cleanup  */
 202         volatile bte_result_t bh_error; /* error while processing   */
 203         volatile u64 *most_rcnt_na;
 204         struct bteinfo_s *btes_to_try[MAX_BTES_PER_NODE];
 205 };
 206
 207
 208 /*
 209  * Function prototypes (functions defined in bte.c, used elsewhere)
 210  */
 211 extern bte_result_t bte_copy(u64, u64, u64, u64, void *);
 212 extern bte_result_t bte_unaligned_copy(u64, u64, u64, u64);
 213 extern void bte_error_handler(unsigned long);
 214
 215 #define bte_zero(dest, len, mode, notification) \
 216         bte_copy(0, dest, len, ((mode) | BTE_ZERO_FILL), notification)
 217
 218 /*
 219  * The following is the preferred way of calling bte_unaligned_copy
 220  * If the copy is fully cache line aligned, then bte_copy is
 221  * used instead.  Since bte_copy is inlined, this saves a call
 222  * stack.  NOTE: bte_copy is called synchronously and does block
 223  * until the transfer is complete.  In order to get the asynch
 224  * version of bte_copy, you must perform this check yourself.
 225  */
 226 #define BTE_UNALIGNED_COPY(src, dest, len, mode)                        \
 227         (((len & (L1_CACHE_BYTES - 1)) ||                               \
 228           (src & (L1_CACHE_BYTES - 1)) ||                               \
 229           (dest & (L1_CACHE_BYTES - 1))) ?                              \
 230          bte_unaligned_copy(src, dest, len, mode) :                     \
 231          bte_copy(src, dest, len, mode, NULL))
 232
 233
 234 #endif  /* _ASM_IA64_SN_BTE_H */