arch/powerpc/include/asm/drmem.h

   1 /*
   2  * drmem.h: Power specific logical memory block representation
   3  *
   4  * Copyright 2017 IBM Corporation
   5  *
   6  * This program is free software; you can redistribute it and/or
   7  * modify it under the terms of the GNU General Public License
   8  * as published by the Free Software Foundation; either version
   9  * 2 of the License, or (at your option) any later version.
  10  */
  11
  12 #ifndef _ASM_POWERPC_LMB_H
  13 #define _ASM_POWERPC_LMB_H
  14
  15 struct drmem_lmb {
  16         u64     base_addr;
  17         u32     drc_index;
  18         u32     aa_index;
  19         u32     flags;
  20 };
  21
  22 struct drmem_lmb_info {
  23         struct drmem_lmb        *lmbs;
  24         int                     n_lmbs;
  25         u32                     lmb_size;
  26 };
  27
  28 extern struct drmem_lmb_info *drmem_info;
  29
  30 #define for_each_drmem_lmb_in_range(lmb, start, end)            \
  31         for ((lmb) = (start); (lmb) <= (end); (lmb)++)
  32
  33 #define for_each_drmem_lmb(lmb)                                 \
  34         for_each_drmem_lmb_in_range((lmb),                      \
  35                 &drmem_info->lmbs[0],                           \
  36                 &drmem_info->lmbs[drmem_info->n_lmbs - 1])
  37
  38 /*
  39  * The of_drconf_cell_v1 struct defines the layout of the LMB data
  40  * specified in the ibm,dynamic-memory device tree property.
  41  * The property itself is a 32-bit value specifying the number of
  42  * LMBs followed by an array of of_drconf_cell_v1 entries, one
  43  * per LMB.
  44  */
  45 struct of_drconf_cell_v1 {
  46         __be64  base_addr;
  47         __be32  drc_index;
  48         __be32  reserved;
  49         __be32  aa_index;
  50         __be32  flags;
  51 };
  52
  53 /*
  54  * Version 2 of the ibm,dynamic-memory property is defined as a
  55  * 32-bit value specifying the number of LMB sets followed by an
  56  * array of of_drconf_cell_v2 entries, one per LMB set.
  57  */
  58 struct of_drconf_cell_v2 {
  59         u32     seq_lmbs;
  60         u64     base_addr;
  61         u32     drc_index;
  62         u32     aa_index;
  63         u32     flags;
  64 } __packed;
  65
  66 #define DRCONF_MEM_ASSIGNED     0x00000008
  67 #define DRCONF_MEM_AI_INVALID   0x00000040
  68 #define DRCONF_MEM_RESERVED     0x00000080
  69
  70 static inline u32 drmem_lmb_size(void)
  71 {
  72         return drmem_info->lmb_size;
  73 }
  74
  75 #define DRMEM_LMB_RESERVED      0x80000000
  76
  77 static inline void drmem_mark_lmb_reserved(struct drmem_lmb *lmb)
  78 {
  79         lmb->flags |= DRMEM_LMB_RESERVED;
  80 }
  81
  82 static inline void drmem_remove_lmb_reservation(struct drmem_lmb *lmb)
  83 {
  84         lmb->flags &= ~DRMEM_LMB_RESERVED;
  85 }
  86
  87 static inline bool drmem_lmb_reserved(struct drmem_lmb *lmb)
  88 {
  89         return lmb->flags & DRMEM_LMB_RESERVED;
  90 }
  91
  92 u64 drmem_lmb_memory_max(void);
  93 void __init walk_drmem_lmbs(struct device_node *dn,
  94                         void (*func)(struct drmem_lmb *, const __be32 **));
  95 int drmem_update_dt(void);
  96
  97 #ifdef CONFIG_PPC_PSERIES
  98 void __init walk_drmem_lmbs_early(unsigned long node,
  99                         void (*func)(struct drmem_lmb *, const __be32 **));
 100 #endif
 101
 102 #endif /* _ASM_POWERPC_LMB_H */