262 lines
7.1 KiB
C
262 lines
7.1 KiB
C
/*
|
|
* 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) 2005 Embedded Alley Solutions, Inc
|
|
*/
|
|
#ifndef __ASM_MACH_KERNEL_ENTRY_INIT_H
|
|
#define __ASM_MACH_KERNEL_ENTRY_INIT_H
|
|
|
|
#include <asm/cacheops.h>
|
|
#include <asm/addrspace.h>
|
|
|
|
#define CO_CONFIGPR_VALID 0x3F1F41FF /* valid bits to write to ConfigPR */
|
|
#define HAZARD_CP0 nop; nop; nop; nop; nop; nop; nop; nop; nop; nop; nop; nop;
|
|
#define CACHE_OPC 0xBC000000 /* MIPS cache instruction opcode */
|
|
#define ICACHE_LINE_SIZE 32 /* Instruction cache line size bytes */
|
|
#define DCACHE_LINE_SIZE 32 /* Data cache line size in bytes */
|
|
|
|
#define ICACHE_SET_COUNT 256 /* Instruction cache set count */
|
|
#define DCACHE_SET_COUNT 128 /* Data cache set count */
|
|
|
|
#define ICACHE_SET_SIZE (ICACHE_SET_COUNT * ICACHE_LINE_SIZE)
|
|
#define DCACHE_SET_SIZE (DCACHE_SET_COUNT * DCACHE_LINE_SIZE)
|
|
|
|
.macro kernel_entry_setup
|
|
.set push
|
|
.set noreorder
|
|
/*
|
|
* PNX8550 entry point, when running a non compressed
|
|
* kernel. When loading a zImage, the head.S code in
|
|
* arch/mips/zboot/pnx8550 will init the caches and,
|
|
* decompress the kernel, and branch to kernel_entry.
|
|
*/
|
|
cache_begin: li t0, (1<<28)
|
|
mtc0 t0, CP0_STATUS /* cp0 usable */
|
|
HAZARD_CP0
|
|
|
|
mtc0 zero, CP0_CAUSE
|
|
HAZARD_CP0
|
|
|
|
|
|
/* Set static virtual to phys address translation and TLB disabled */
|
|
mfc0 t0, CP0_CONFIG, 7
|
|
HAZARD_CP0
|
|
|
|
and t0,~((1<<19) | (1<<20)) /* TLB/MAP cleared */
|
|
mtc0 t0, CP0_CONFIG, 7
|
|
HAZARD_CP0
|
|
|
|
/* CPU boots with kseg0 cache algo set to 0x2 -- uncached */
|
|
|
|
init_icache
|
|
nop
|
|
init_dcache
|
|
nop
|
|
|
|
cachePr4450ICReset
|
|
nop
|
|
|
|
cachePr4450DCReset
|
|
nop
|
|
|
|
/* read ConfigPR into t0 */
|
|
mfc0 t0, CP0_CONFIG, 7
|
|
HAZARD_CP0
|
|
|
|
/* enable the TLB */
|
|
or t0, (1<<19)
|
|
|
|
/* disable the ICACHE: at least 10x slower */
|
|
/* or t0, (1<<26) */
|
|
|
|
/* disable the DCACHE; CONFIG_CPU_HAS_LLSC should not be set */
|
|
/* or t0, (1<<27) */
|
|
|
|
and t0, CO_CONFIGPR_VALID
|
|
|
|
/* enable TLB. */
|
|
mtc0 t0, CP0_CONFIG, 7
|
|
HAZARD_CP0
|
|
cache_end:
|
|
/* Setup CMEM_0 to MMIO address space, 2MB */
|
|
lui t0, 0x1BE0
|
|
addi t0, t0, 0x3
|
|
mtc0 $8, $22, 4
|
|
nop
|
|
|
|
/* Setup CMEM_1, 128MB */
|
|
lui t0, 0x1000
|
|
addi t0, t0, 0xf
|
|
mtc0 $8, $22, 5
|
|
nop
|
|
|
|
|
|
/* Setup CMEM_2, 32MB */
|
|
lui t0, 0x1C00
|
|
addi t0, t0, 0xb
|
|
mtc0 $8, $22, 6
|
|
nop
|
|
|
|
/* Setup CMEM_3, 0MB */
|
|
lui t0, 0x0
|
|
addi t0, t0, 0x0
|
|
mtc0 $8, $22, 7
|
|
nop
|
|
|
|
/* Enable cache */
|
|
mfc0 t0, CP0_CONFIG
|
|
HAZARD_CP0
|
|
and t0, t0, 0xFFFFFFF8
|
|
or t0, t0, 3
|
|
mtc0 t0, CP0_CONFIG
|
|
HAZARD_CP0
|
|
.set pop
|
|
.endm
|
|
|
|
.macro init_icache
|
|
.set push
|
|
.set noreorder
|
|
|
|
/* Get Cache Configuration */
|
|
mfc0 t3, CP0_CONFIG, 1
|
|
HAZARD_CP0
|
|
|
|
/* get cache Line size */
|
|
|
|
srl t1, t3, 19 /* C0_CONFIGPR_IL_SHIFT */
|
|
andi t1, t1, 0x7 /* C0_CONFIGPR_IL_MASK */
|
|
beq t1, zero, pr4450_instr_cache_invalidated /* if zero instruction cache is absent */
|
|
nop
|
|
addiu t0, t1, 1
|
|
ori t1, zero, 1
|
|
sllv t1, t1, t0
|
|
|
|
/* get max cache Index */
|
|
srl t2, t3, 22 /* C0_CONFIGPR_IS_SHIFT */
|
|
andi t2, t2, 0x7 /* C0_CONFIGPR_IS_MASK */
|
|
addiu t0, t2, 6
|
|
ori t2, zero, 1
|
|
sllv t2, t2, t0
|
|
|
|
/* get max cache way */
|
|
srl t3, t3, 16 /* C0_CONFIGPR_IA_SHIFT */
|
|
andi t3, t3, 0x7 /* C0_CONFIGPR_IA_MASK */
|
|
addiu t3, t3, 1
|
|
|
|
/* total no of cache lines */
|
|
multu t2, t3 /* max index * max way */
|
|
mflo t2
|
|
addiu t2, t2, -1
|
|
|
|
move t0, zero
|
|
pr4450_next_instruction_cache_set:
|
|
cache Index_Invalidate_I, 0(t0)
|
|
addu t0, t0, t1 /* add bytes in a line */
|
|
bne t2, zero, pr4450_next_instruction_cache_set
|
|
addiu t2, t2, -1 /* reduce no of lines to invalidate by one */
|
|
pr4450_instr_cache_invalidated:
|
|
.set pop
|
|
.endm
|
|
|
|
.macro init_dcache
|
|
.set push
|
|
.set noreorder
|
|
move t1, zero
|
|
|
|
/* Store Tag Information */
|
|
mtc0 zero, CP0_TAGLO, 0
|
|
HAZARD_CP0
|
|
|
|
mtc0 zero, CP0_TAGHI, 0
|
|
HAZARD_CP0
|
|
|
|
/* Cache size is 16384 = 512 lines x 32 bytes per line */
|
|
or t2, zero, (128*4)-1 /* 512 lines */
|
|
/* Invalidate all lines */
|
|
2:
|
|
cache Index_Store_Tag_D, 0(t1)
|
|
addiu t2, t2, -1
|
|
bne t2, zero, 2b
|
|
addiu t1, t1, 32 /* 32 bytes in a line */
|
|
.set pop
|
|
.endm
|
|
|
|
.macro cachePr4450ICReset
|
|
.set push
|
|
.set noreorder
|
|
|
|
/* Save CP0 status reg on entry; */
|
|
/* disable interrupts during cache reset */
|
|
mfc0 t0, CP0_STATUS /* T0 = interrupt status on entry */
|
|
HAZARD_CP0
|
|
|
|
mtc0 zero, CP0_STATUS /* disable CPU interrupts */
|
|
HAZARD_CP0
|
|
|
|
or t1, zero, zero /* T1 = starting cache index (0) */
|
|
ori t2, zero, (256 - 1) /* T2 = inst cache set cnt - 1 */
|
|
|
|
icache_invd_loop:
|
|
/* 9 == register t1 */
|
|
.word (CACHE_OPC | (9 << 21) | (Index_Invalidate_I << 16) | \
|
|
(0 * ICACHE_SET_SIZE)) /* invalidate inst cache WAY0 */
|
|
.word (CACHE_OPC | (9 << 21) | (Index_Invalidate_I << 16) | \
|
|
(1 * ICACHE_SET_SIZE)) /* invalidate inst cache WAY1 */
|
|
|
|
addiu t1, t1, ICACHE_LINE_SIZE /* T1 = next cache line index */
|
|
bne t2, zero, icache_invd_loop /* T2 = 0 if all sets invalidated */
|
|
addiu t2, t2, -1 /* decrement T2 set cnt (delay slot) */
|
|
|
|
/* Initialize the latches in the instruction cache tag */
|
|
/* that drive the way selection tri-state bus drivers, by doing a */
|
|
/* dummy load while the instruction cache is still disabled. */
|
|
/* TODO: Is this needed ? */
|
|
la t1, KSEG0 /* T1 = cached memory base address */
|
|
lw zero, 0x0000(t1) /* (dummy read of first memory word) */
|
|
|
|
mtc0 t0, CP0_STATUS /* restore interrupt status on entry */
|
|
HAZARD_CP0
|
|
.set pop
|
|
.endm
|
|
|
|
.macro cachePr4450DCReset
|
|
.set push
|
|
.set noreorder
|
|
mfc0 t0, CP0_STATUS /* T0 = interrupt status on entry */
|
|
HAZARD_CP0
|
|
mtc0 zero, CP0_STATUS /* disable CPU interrupts */
|
|
HAZARD_CP0
|
|
|
|
/* Writeback/invalidate entire data cache sets/ways/lines */
|
|
or t1, zero, zero /* T1 = starting cache index (0) */
|
|
ori t2, zero, (DCACHE_SET_COUNT - 1) /* T2 = data cache set cnt - 1 */
|
|
|
|
dcache_wbinvd_loop:
|
|
/* 9 == register t1 */
|
|
.word (CACHE_OPC | (9 << 21) | (Index_Writeback_Inv_D << 16) | \
|
|
(0 * DCACHE_SET_SIZE)) /* writeback/invalidate WAY0 */
|
|
.word (CACHE_OPC | (9 << 21) | (Index_Writeback_Inv_D << 16) | \
|
|
(1 * DCACHE_SET_SIZE)) /* writeback/invalidate WAY1 */
|
|
.word (CACHE_OPC | (9 << 21) | (Index_Writeback_Inv_D << 16) | \
|
|
(2 * DCACHE_SET_SIZE)) /* writeback/invalidate WAY2 */
|
|
.word (CACHE_OPC | (9 << 21) | (Index_Writeback_Inv_D << 16) | \
|
|
(3 * DCACHE_SET_SIZE)) /* writeback/invalidate WAY3 */
|
|
|
|
addiu t1, t1, DCACHE_LINE_SIZE /* T1 = next data cache line index */
|
|
bne t2, zero, dcache_wbinvd_loop /* T2 = 0 when wbinvd entire cache */
|
|
addiu t2, t2, -1 /* decrement T2 set cnt (delay slot) */
|
|
|
|
/* Initialize the latches in the data cache tag that drive the way
|
|
selection tri-state bus drivers, by doing a dummy load while the
|
|
data cache is still in the disabled mode. TODO: Is this needed ? */
|
|
la t1, KSEG0 /* T1 = cached memory base address */
|
|
lw zero, 0x0000(t1) /* (dummy read of first memory word) */
|
|
|
|
mtc0 t0, CP0_STATUS /* restore interrupt status on entry */
|
|
HAZARD_CP0
|
|
.set pop
|
|
.endm
|
|
|
|
#endif /* __ASM_MACH_KERNEL_ENTRY_INIT_H */
|