arch/powerpc/platforms/cell/spufs/spu_utils.h

   1 /*
   2  * utils.h: Utilities for SPU-side of the context switch operation.
   3  *
   4  * (C) Copyright IBM 2005
   5  *
   6  * This program is free software; you can redistribute it and/or modify
   7  * it under the terms of the GNU General Public License as published by
   8  * the Free Software Foundation; either version 2, or (at your option)
   9  * any later version.
  10  *
  11  * This program is distributed in the hope that it will be useful,
  12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
  14  * GNU General Public License for more details.
  15  *
  16  * You should have received a copy of the GNU General Public License
  17  * along with this program; if not, write to the Free Software
  18  * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  19  */
  20
  21 #ifndef _SPU_CONTEXT_UTILS_H_
  22 #define _SPU_CONTEXT_UTILS_H_
  23
  24 /*
  25  * 64-bit safe EA.
  26  */
  27 typedef union {
  28         unsigned long long ull;
  29         unsigned int ui[2];
  30 } addr64;
  31
  32 /*
  33  * 128-bit register template.
  34  */
  35 typedef union {
  36         unsigned int slot[4];
  37         vector unsigned int v;
  38 } spu_reg128v;
  39
  40 /*
  41  * DMA list structure.
  42  */
  43 struct dma_list_elem {
  44         unsigned int size;
  45         unsigned int ea_low;
  46 };
  47
  48 /*
  49  * Declare storage for 8-byte aligned DMA list.
  50  */
  51 struct dma_list_elem dma_list[15] __attribute__ ((aligned(8)));
  52
  53 /*
  54  * External definition for storage
  55  * declared in crt0.
  56  */
  57 extern spu_reg128v regs_spill[NR_SPU_SPILL_REGS];
  58
  59 /*
  60  * Compute LSCSA byte offset for a given field.
  61  */
  62 static struct spu_lscsa *dummy = (struct spu_lscsa *)0;
  63 #define LSCSA_BYTE_OFFSET(_field)  \
  64         ((char *)(&(dummy->_field)) - (char *)(&(dummy->gprs[0].slot[0])))
  65 #define LSCSA_QW_OFFSET(_field)  (LSCSA_BYTE_OFFSET(_field) >> 4)
  66
  67 static inline void set_event_mask(void)
  68 {
  69         unsigned int event_mask = 0;
  70
  71         /* Save, Step 4:
  72          * Restore, Step 1:
  73          *    Set the SPU_RdEventMsk channel to zero to mask
  74          *    all events.
  75          */
  76         spu_writech(SPU_WrEventMask, event_mask);
  77 }
  78
  79 static inline void set_tag_mask(void)
  80 {
  81         unsigned int tag_mask = 1;
  82
  83         /* Save, Step 5:
  84          * Restore, Step 2:
  85          *    Set the SPU_WrTagMsk channel to '01' to unmask
  86          *    only tag group 0.
  87          */
  88         spu_writech(MFC_WrTagMask, tag_mask);
  89 }
  90
  91 static inline void build_dma_list(addr64 lscsa_ea)
  92 {
  93         unsigned int ea_low;
  94         int i;
  95
  96         /* Save, Step 6:
  97          * Restore, Step 3:
  98          *    Update the effective address for the CSA in the
  99          *    pre-canned DMA-list in local storage.
 100          */
 101         ea_low = lscsa_ea.ui[1];
 102         ea_low += LSCSA_BYTE_OFFSET(ls[16384]);
 103
 104         for (i = 0; i < 15; i++, ea_low += 16384) {
 105                 dma_list[i].size = 16384;
 106                 dma_list[i].ea_low = ea_low;
 107         }
 108 }
 109
 110 static inline void enqueue_putllc(addr64 lscsa_ea)
 111 {
 112         unsigned int ls = 0;
 113         unsigned int size = 128;
 114         unsigned int tag_id = 0;
 115         unsigned int cmd = 0xB4;        /* PUTLLC */
 116
 117         /* Save, Step 12:
 118          * Restore, Step 7:
 119          *    Send a PUTLLC (tag 0) command to the MFC using
 120          *    an effective address in the CSA in order to
 121          *    remove any possible lock-line reservation.
 122          */
 123         spu_writech(MFC_LSA, ls);
 124         spu_writech(MFC_EAH, lscsa_ea.ui[0]);
 125         spu_writech(MFC_EAL, lscsa_ea.ui[1]);
 126         spu_writech(MFC_Size, size);
 127         spu_writech(MFC_TagID, tag_id);
 128         spu_writech(MFC_Cmd, cmd);
 129 }
 130
 131 static inline void set_tag_update(void)
 132 {
 133         unsigned int update_any = 1;
 134
 135         /* Save, Step 15:
 136          * Restore, Step 8:
 137          *    Write the MFC_TagUpdate channel with '01'.
 138          */
 139         spu_writech(MFC_WrTagUpdate, update_any);
 140 }
 141
 142 static inline void read_tag_status(void)
 143 {
 144         /* Save, Step 16:
 145          * Restore, Step 9:
 146          *    Read the MFC_TagStat channel data.
 147          */
 148         spu_readch(MFC_RdTagStat);
 149 }
 150
 151 static inline void read_llar_status(void)
 152 {
 153         /* Save, Step 17:
 154          * Restore, Step 10:
 155          *    Read the MFC_AtomicStat channel data.
 156          */
 157         spu_readch(MFC_RdAtomicStat);
 158 }
 159
 160 #endif                          /* _SPU_CONTEXT_UTILS_H_ */