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author | Daniel Hellstrom <daniel@gaisler.com> | 2010-01-25 09:54:51 +0100 |
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committer | Francois Retief <fgretief@spaceteq.co.za> | 2015-11-13 10:23:32 +0200 |
commit | 898cc81da3dd5bfa0f77f1791f76d3512b5e4dce (patch) | |
tree | c3ebbab26c559c40e7b7a8edf4238b2c4daf5b62 /arch/sparc/cpu/leon3/ambapp_low_c.S | |
parent | 0070109f683657ba3f864792ae134f74282ae4e8 (diff) | |
download | u-boot-imx-898cc81da3dd5bfa0f77f1791f76d3512b5e4dce.zip u-boot-imx-898cc81da3dd5bfa0f77f1791f76d3512b5e4dce.tar.gz u-boot-imx-898cc81da3dd5bfa0f77f1791f76d3512b5e4dce.tar.bz2 |
sparc: leon3: Reimplemented AMBA Plug&Play scanning routines.
Signed-off-by: Daniel Hellstrom <daniel@gaisler.com>
Diffstat (limited to 'arch/sparc/cpu/leon3/ambapp_low_c.S')
-rw-r--r-- | arch/sparc/cpu/leon3/ambapp_low_c.S | 113 |
1 files changed, 113 insertions, 0 deletions
diff --git a/arch/sparc/cpu/leon3/ambapp_low_c.S b/arch/sparc/cpu/leon3/ambapp_low_c.S new file mode 100644 index 0000000..42288fa --- /dev/null +++ b/arch/sparc/cpu/leon3/ambapp_low_c.S @@ -0,0 +1,113 @@ +/* C-interface for AMBA PnP scanning functions implemented in + * ambapp_low.S. At the point the memory and stack can be + * used. + * + * (C) Copyright 2010, 2015 + * Daniel Hellstrom, Cobham Gaisler, daniel@gaisler.com. + * + * SPDX-License-Identifier: GPL-2.0+ + */ + + + .seg "text" + .extern _nomem_ambapp_find_buses + .extern _nomem_find_apb + .extern _nomem_find_ahb + + .globl ambapp_find_buses + .globl ambapp_find_apb + .globl ambapp_find_ahb + + +/* C-interface for _nomem_ambapp_find_buses used when memory is available. + */ +ambapp_find_buses: + save %sp, -104, %sp + mov %i1, %l7 /* Save second argument */ + call _nomem_ambapp_find_buses + mov %i0, %o0 + + /* Store result */ + st %g0, [%l7+0x00] + st %i0, [%l7+0x04] + st %i1, [%l7+0x08] + st %i2, [%l7+0x0c] + st %i3, [%l7+0x10] + st %i4, [%l7+0x14] + st %i5, [%l7+0x18] + + ret + restore + +/* C-interface for _nomem_find_apb used when memory is available. + * + * void ambapp_find_apb( + * struct ambapp_bus *abus, + * unsigned int dev_vend, + * int index, + * struct ambapp_find_apb_info *result + * ); + * + */ +ambapp_find_apb: + save %sp, -104, %sp + + mov %i3, %l7 /* Save second argument */ + mov %i1, %o1 + mov %i2, %o2 + + /* Initialize buses available in system */ + ld [%i0+0x08], %i1 + ld [%i0+0x0c], %i2 + ld [%i0+0x10], %i3 + ld [%i0+0x14], %i4 + ld [%i0+0x18], %i5 + + call _nomem_find_apb + ld [%i0+0x04], %i0 + + st %o2, [%l7+0x08] /* Decremented Index */ + st %o3, [%l7] /* PnP configuration address of APB Device */ + st %o4, [%l7+0x04] /* AHB Bus Index of AHB/APB bridge and APB Device */ + mov %o0, %i0 + ret + restore + +/* C-interface for _nomem_find_ahb used when memory is available. + * + * void ambapp_find_ahb( + * struct ambapp_bus *abus, + * unsigned int dev_vend, + * int index, + * int type, + * struct ambapp_find_ahb_info *result + * ); + * + */ +ambapp_find_ahb: + save %sp, -104, %sp + + mov %i4, %l7 /* Save second argument */ + clr %o0 + mov %i1, %o1 + mov %i2, %o2 + clr %o3 + clr %o4 + mov %i3, %o5 + + /* Initialize buses available in system */ + ld [%i0+0x08], %i1 + ld [%i0+0x0c], %i2 + ld [%i0+0x10], %i3 + ld [%i0+0x14], %i4 + ld [%i0+0x18], %i5 + + call _nomem_find_ahb + ld [%i0+0x04], %i0 + + st %o2, [%l7+0x08] /* Decremented Index */ + st %o3, [%l7] /* PnP configuration address of AHB Device */ + st %o4, [%l7+0x04] /* AHB Bus Index of AHB Device */ + mov %o0, %i0 + ret + restore |