LXR uboot/arch/sparc/cpu/leon3/ambapp_low

   1/* C-interface for AMBA PnP scanning functions implemented in
   2 * ambapp_low.S. At the point the memory and stack can be
   3 * used.
   4 *
   5 * (C) Copyright 2010, 2015
   6 * Daniel Hellstrom, Cobham Gaisler, daniel@gaisler.com.
   7 *
   8 * SPDX-License-Identifier:     GPL-2.0+
   9 */
  10
  11
  12        .seg    "text"
  13        .extern _nomem_ambapp_find_buses
  14        .extern _nomem_find_apb
  15        .extern _nomem_find_ahb
  16
  17        .globl  ambapp_find_buses
  18        .globl  ambapp_find_apb
  19        .globl  ambapp_find_ahb
  20
  21
  22/* C-interface for _nomem_ambapp_find_buses used when memory is available.
  23 */
  24ambapp_find_buses:
  25        save    %sp, -104, %sp
  26        mov     %i1, %l7        /* Save second argument */
  27        call _nomem_ambapp_find_buses
  28         mov    %i0, %o0
  29
  30        /* Store result */
  31        st      %g0, [%l7+0x00]
  32        st      %i0, [%l7+0x04]
  33        st      %i1, [%l7+0x08]
  34        st      %i2, [%l7+0x0c]
  35        st      %i3, [%l7+0x10]
  36        st      %i4, [%l7+0x14]
  37        st      %i5, [%l7+0x18]
  38
  39        ret
  40         restore
  41
  42/* C-interface for _nomem_find_apb used when memory is available.
  43 *
  44 * void ambapp_find_apb(
  45 *      struct ambapp_bus *abus,
  46 *      unsigned int dev_vend,
  47 *      int index,
  48 *      struct ambapp_find_apb_info *result
  49 *      );
  50 *
  51 */
  52ambapp_find_apb:
  53        save    %sp, -104, %sp
  54
  55        mov     %i3, %l7        /* Save second argument */
  56        mov     %i1, %o1
  57        mov     %i2, %o2
  58
  59        /* Initialize buses available in system */
  60        ld      [%i0+0x08], %i1
  61        ld      [%i0+0x0c], %i2
  62        ld      [%i0+0x10], %i3
  63        ld      [%i0+0x14], %i4
  64        ld      [%i0+0x18], %i5
  65
  66        call _nomem_find_apb
  67         ld     [%i0+0x04], %i0
  68
  69        st      %o2, [%l7+0x08] /* Decremented Index */
  70        st      %o3, [%l7]      /* PnP configuration address of APB Device */
  71        st      %o4, [%l7+0x04] /* AHB Bus Index of AHB/APB bridge and APB Device */
  72        mov     %o0, %i0
  73        ret
  74         restore
  75
  76/* C-interface for _nomem_find_ahb used when memory is available.
  77 *
  78 * void ambapp_find_ahb(
  79 *      struct ambapp_bus *abus,
  80 *      unsigned int dev_vend,
  81 *      int index,
  82 *      int type,
  83 *      struct ambapp_find_ahb_info *result
  84 *      );
  85 *
  86 */
  87ambapp_find_ahb:
  88        save    %sp, -104, %sp
  89
  90        mov     %i4, %l7        /* Save second argument */
  91        clr     %o0
  92        mov     %i1, %o1
  93        mov     %i2, %o2
  94        clr     %o3
  95        clr     %o4
  96        mov     %i3, %o5
  97
  98        /* Initialize buses available in system */
  99        ld      [%i0+0x08], %i1
 100        ld      [%i0+0x0c], %i2
 101        ld      [%i0+0x10], %i3
 102        ld      [%i0+0x14], %i4
 103        ld      [%i0+0x18], %i5
 104
 105        call _nomem_find_ahb
 106         ld     [%i0+0x04], %i0
 107
 108        st      %o2, [%l7+0x08] /* Decremented Index */
 109        st      %o3, [%l7]      /* PnP configuration address of AHB Device */
 110        st      %o4, [%l7+0x04] /* AHB Bus Index of AHB Device */
 111        mov     %o0, %i0
 112        ret
 113         restore
 114