diff options
Diffstat (limited to 'arch/mips/include/asm/mach-malta')
| -rw-r--r-- | arch/mips/include/asm/mach-malta/kernel-entry-init.h | 115 | ||||
| -rw-r--r-- | arch/mips/include/asm/mach-malta/spaces.h | 46 |
2 files changed, 160 insertions, 1 deletions
diff --git a/arch/mips/include/asm/mach-malta/kernel-entry-init.h b/arch/mips/include/asm/mach-malta/kernel-entry-init.h index 0b793e7bf67e..7c5e17a17849 100644 --- a/arch/mips/include/asm/mach-malta/kernel-entry-init.h +++ b/arch/mips/include/asm/mach-malta/kernel-entry-init.h @@ -5,10 +5,80 @@ * * Chris Dearman (chris@mips.com) * Copyright (C) 2007 Mips Technologies, Inc. + * Copyright (C) 2014 Imagination Technologies Ltd. */ #ifndef __ASM_MACH_MIPS_KERNEL_ENTRY_INIT_H #define __ASM_MACH_MIPS_KERNEL_ENTRY_INIT_H + /* + * Prepare segments for EVA boot: + * + * This is in case the processor boots in legacy configuration + * (SI_EVAReset is de-asserted and CONFIG5.K == 0) + * + * On entry, t1 is loaded with CP0_CONFIG + * + * ========================= Mappings ============================= + * Virtual memory Physical memory Mapping + * 0x00000000 - 0x7fffffff 0x80000000 - 0xfffffffff MUSUK (kuseg) + * Flat 2GB physical memory + * + * 0x80000000 - 0x9fffffff 0x00000000 - 0x1ffffffff MUSUK (kseg0) + * 0xa0000000 - 0xbf000000 0x00000000 - 0x1ffffffff MUSUK (kseg1) + * 0xc0000000 - 0xdfffffff - MK (kseg2) + * 0xe0000000 - 0xffffffff - MK (kseg3) + * + * + * Lowmem is expanded to 2GB + */ + .macro eva_entry + /* + * Get Config.K0 value and use it to program + * the segmentation registers + */ + andi t1, 0x7 /* CCA */ + move t2, t1 + ins t2, t1, 16, 3 + /* SegCtl0 */ + li t0, ((MIPS_SEGCFG_MK << MIPS_SEGCFG_AM_SHIFT) | \ + (0 << MIPS_SEGCFG_PA_SHIFT) | \ + (1 << MIPS_SEGCFG_EU_SHIFT)) | \ + (((MIPS_SEGCFG_MK << MIPS_SEGCFG_AM_SHIFT) | \ + (0 << MIPS_SEGCFG_PA_SHIFT) | \ + (1 << MIPS_SEGCFG_EU_SHIFT)) << 16) + or t0, t2 + mtc0 t0, $5, 2 + + /* SegCtl1 */ + li t0, ((MIPS_SEGCFG_MUSUK << MIPS_SEGCFG_AM_SHIFT) | \ + (0 << MIPS_SEGCFG_PA_SHIFT) | \ + (2 << MIPS_SEGCFG_C_SHIFT) | \ + (1 << MIPS_SEGCFG_EU_SHIFT)) | \ + (((MIPS_SEGCFG_MUSUK << MIPS_SEGCFG_AM_SHIFT) | \ + (0 << MIPS_SEGCFG_PA_SHIFT) | \ + (1 << MIPS_SEGCFG_EU_SHIFT)) << 16) + ins t0, t1, 16, 3 + mtc0 t0, $5, 3 + + /* SegCtl2 */ + li t0, ((MIPS_SEGCFG_MUSUK << MIPS_SEGCFG_AM_SHIFT) | \ + (6 << MIPS_SEGCFG_PA_SHIFT) | \ + (1 << MIPS_SEGCFG_EU_SHIFT)) | \ + (((MIPS_SEGCFG_MUSUK << MIPS_SEGCFG_AM_SHIFT) | \ + (4 << MIPS_SEGCFG_PA_SHIFT) | \ + (1 << MIPS_SEGCFG_EU_SHIFT)) << 16) + or t0, t2 + mtc0 t0, $5, 4 + + jal mips_ihb + mfc0 t0, $16, 5 + li t2, 0x40000000 /* K bit */ + or t0, t0, t2 + mtc0 t0, $16, 5 + sync + jal mips_ihb + .endm + .macro kernel_entry_setup #ifdef CONFIG_MIPS_MT_SMTC mfc0 t0, CP0_CONFIG @@ -39,14 +109,57 @@ nonmt_processor: .asciz "SMTC kernel requires the MT ASE to run\n" __FINIT -0: #endif + +#ifdef CONFIG_EVA + sync + ehb + + mfc0 t1, CP0_CONFIG + bgez t1, 9f + mfc0 t0, CP0_CONFIG, 1 + bgez t0, 9f + mfc0 t0, CP0_CONFIG, 2 + bgez t0, 9f + mfc0 t0, CP0_CONFIG, 3 + sll t0, t0, 6 /* SC bit */ + bgez t0, 9f + + eva_entry + b 0f +9: + /* Assume we came from YAMON... */ + PTR_LA v0, 0x9fc00534 /* YAMON print */ + lw v0, (v0) + move a0, zero + PTR_LA a1, nonsc_processor + jal v0 + + PTR_LA v0, 0x9fc00520 /* YAMON exit */ + lw v0, (v0) + li a0, 1 + jal v0 + +1: b 1b + nop + __INITDATA +nonsc_processor: + .asciz "EVA kernel requires a MIPS core with Segment Control implemented\n" + __FINIT +#endif /* CONFIG_EVA */ +0: .endm /* * Do SMP slave processor setup necessary before we can safely execute C code. */ .macro smp_slave_setup +#ifdef CONFIG_EVA + sync + ehb + mfc0 t1, CP0_CONFIG + eva_entry +#endif .endm #endif /* __ASM_MACH_MIPS_KERNEL_ENTRY_INIT_H */ diff --git a/arch/mips/include/asm/mach-malta/spaces.h b/arch/mips/include/asm/mach-malta/spaces.h new file mode 100644 index 000000000000..d7e54971ec66 --- /dev/null +++ b/arch/mips/include/asm/mach-malta/spaces.h @@ -0,0 +1,46 @@ +/* + * This file is subject to the terms and conditions of the GNU General Public + * License. See the file "COPYING" in the main directory of this archive + * for more details. + * + * Copyright (C) 2014 Imagination Technologies Ltd. + */ + +#ifndef _ASM_MALTA_SPACES_H +#define _ASM_MALTA_SPACES_H + +#ifdef CONFIG_EVA + +/* + * Traditional Malta Board Memory Map for EVA + * + * 0x00000000 - 0x0fffffff: 1st RAM region, 256MB + * 0x10000000 - 0x1bffffff: GIC and CPC Control Registers + * 0x1c000000 - 0x1fffffff: I/O And Flash + * 0x20000000 - 0x7fffffff: 2nd RAM region, 1.5GB + * 0x80000000 - 0xffffffff: Physical memory aliases to 0x0 (2GB) + * + * The kernel is still located in 0x80000000(kseg0). However, + * the physical mask has been shifted to 0x80000000 which exploits the alias + * on the Malta board. As a result of which, we override the __pa_symbol + * to peform direct mapping from virtual to physical addresses. In other + * words, the 0x80000000 virtual address maps to 0x80000000 physical address + * which in turn aliases to 0x0. We do this in order to be able to use a flat + * 2GB of memory (0x80000000 - 0xffffffff) so we can avoid the I/O hole in + * 0x10000000 - 0x1fffffff. + * The last 64KB of physical memory are reserved for correct HIGHMEM + * macros arithmetics. + * + */ + +#define PAGE_OFFSET _AC(0x0, UL) +#define PHYS_OFFSET _AC(0x80000000, UL) +#define HIGHMEM_START _AC(0xffff0000, UL) + +#define __pa_symbol(x) (RELOC_HIDE((unsigned long)(x), 0)) + +#endif /* CONFIG_EVA */ + +#include <asm/mach-generic/spaces.h> + +#endif /* _ASM_MALTA_SPACES_H */ |