| Daniel Hellstrom | 02e2a84 | 2010-01-25 09:54:51 +0100 | [diff] [blame] | 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 | */ |
| 24 | ambapp_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 | */ |
| 52 | ambapp_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 | */ |
| 87 | ambapp_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 |