| Aaron Williams | b2ea818 | 2020-06-30 12:08:56 +0200 | [diff] [blame] | 1 | /* SPDX-License-Identifier: GPL-2.0 */ |
| 2 | /* |
| 3 | * Copyright (C) 2020 Stefan Roese <sr@denx.de> |
| 4 | */ |
| 5 | |
| 6 | #include <config.h> |
| 7 | #include <asm-offsets.h> |
| 8 | #include <asm/cacheops.h> |
| 9 | #include <asm/regdef.h> |
| 10 | #include <asm/mipsregs.h> |
| 11 | #include <asm/addrspace.h> |
| 12 | #include <asm/asm.h> |
| 13 | |
| 14 | .set noreorder |
| 15 | |
| 16 | LEAF(lowlevel_init) |
| 17 | jr ra |
| 18 | nop |
| 19 | END(lowlevel_init) |
| Stefan Roese | 15ba802 | 2020-06-30 12:33:17 +0200 | [diff] [blame] | 20 | |
| 21 | LEAF(mips_mach_early_init) |
| 22 | |
| 23 | move s0, ra |
| 24 | |
| 25 | bal __dummy |
| 26 | nop |
| 27 | |
| 28 | __dummy: |
| 29 | /* Get the actual address that we are running at */ |
| 30 | PTR_LA a7, __dummy |
| 31 | dsubu t3, ra, a7 /* t3 now has reloc offset */ |
| 32 | |
| 33 | PTR_LA t1, _start |
| 34 | daddu t0, t1, t3 /* t0 now has actual address of _start */ |
| 35 | |
| 36 | /* Calculate end address of copy loop */ |
| 37 | PTR_LA t2, _end |
| 38 | daddiu t2, t2, 0x4000 /* Increase size to include appended DTB */ |
| 39 | daddiu t2, t2, 127 |
| 40 | ins t2, zero, 0, 7 /* Round up to cache line for memcpy */ |
| 41 | |
| 42 | /* Copy ourself to the L2 cache from flash, 32 bytes at a time */ |
| 43 | 1: |
| 44 | ld a0, 0(t0) |
| 45 | ld a1, 8(t0) |
| 46 | ld a2, 16(t0) |
| 47 | ld a3, 24(t0) |
| 48 | sd a0, 0(t1) |
| 49 | sd a1, 8(t1) |
| 50 | sd a2, 16(t1) |
| 51 | sd a3, 24(t1) |
| 52 | addiu t0, 32 |
| 53 | addiu t1, 32 |
| 54 | bne t1, t2, 1b |
| 55 | nop |
| 56 | |
| 57 | sync |
| 58 | |
| 59 | /* |
| 60 | * Return to start.S now running from TEXT_BASE, which points |
| 61 | * to DRAM address space, which effectively is L2 cache now. |
| 62 | * This speeds up the init process extremely, especially the |
| 63 | * DDR init code. |
| 64 | */ |
| 65 | dsubu s0, s0, t3 /* Fixup return address with reloc offset */ |
| 66 | jr.hb s0 /* Jump back with hazard barrier */ |
| 67 | nop |
| 68 | |
| 69 | END(mips_mach_early_init) |