--- /dev/null
+
+/*
+ * 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) 2011-2012 by Broadcom Corporation
+ *
+ * Init for bmips 5000.
+ * Used to init second core in dual core 5000's.
+ */
+
+#include <linux/init.h>
+
+#include <asm/asm.h>
+#include <asm/asmmacro.h>
+#include <asm/cacheops.h>
+#include <asm/regdef.h>
+#include <asm/mipsregs.h>
+#include <asm/stackframe.h>
+#include <asm/addrspace.h>
+#include <asm/hazards.h>
+#include <asm/bmips.h>
+
+#ifdef CONFIG_CPU_BMIPS5000
+
+
+#define cacheop(kva, size, linesize, op) \
+ .set noreorder ; \
+ addu t1, kva, size ; \
+ subu t2, linesize, 1 ; \
+ not t2 ; \
+ and t0, kva, t2 ; \
+ addiu t1, t1, -1 ; \
+ and t1, t2 ; \
+9: cache op, 0(t0) ; \
+ bne t0, t1, 9b ; \
+ addu t0, linesize ; \
+ .set reorder ;
+
+
+
+#define IS_SHIFT 22
+#define IL_SHIFT 19
+#define IA_SHIFT 16
+#define DS_SHIFT 13
+#define DL_SHIFT 10
+#define DA_SHIFT 7
+#define IS_MASK 7
+#define IL_MASK 7
+#define IA_MASK 7
+#define DS_MASK 7
+#define DL_MASK 7
+#define DA_MASK 7
+#define ICE_MASK 0x80000000
+#define DCE_MASK 0x40000000
+
+#define CP0_BRCM_CONFIG0 $22, 0
+#define CP0_BRCM_MODE $22, 1
+#define CP0_CONFIG_K0_MASK 7
+
+#define CP0_ICACHE_TAG_LO $28
+#define CP0_ICACHE_DATA_LO $28, 1
+#define CP0_DCACHE_TAG_LO $28, 2
+#define CP0_D_SEC_CACHE_DATA_LO $28, 3
+#define CP0_ICACHE_TAG_HI $29
+#define CP0_ICACHE_DATA_HI $29, 1
+#define CP0_DCACHE_TAG_HI $29, 2
+
+#define CP0_BRCM_MODE_Luc_MASK (1 << 11)
+#define CP0_BRCM_CONFIG0_CWF_MASK (1 << 20)
+#define CP0_BRCM_CONFIG0_TSE_MASK (1 << 19)
+#define CP0_BRCM_MODE_SET_MASK (1 << 7)
+#define CP0_BRCM_MODE_ClkRATIO_MASK (7 << 4)
+#define CP0_BRCM_MODE_BrPRED_MASK (3 << 24)
+#define CP0_BRCM_MODE_BrPRED_SHIFT 24
+#define CP0_BRCM_MODE_BrHIST_MASK (0x1f << 20)
+#define CP0_BRCM_MODE_BrHIST_SHIFT 20
+
+/* ZSC L2 Cache Register Access Register Definitions */
+#define BRCM_ZSC_ALL_REGS_SELECT 0x7 << 24
+
+#define BRCM_ZSC_CONFIG_REG 0 << 3
+#define BRCM_ZSC_REQ_BUFFER_REG 2 << 3
+#define BRCM_ZSC_RBUS_ADDR_MAPPING_REG0 4 << 3
+#define BRCM_ZSC_RBUS_ADDR_MAPPING_REG1 6 << 3
+#define BRCM_ZSC_RBUS_ADDR_MAPPING_REG2 8 << 3
+
+#define BRCM_ZSC_SCB0_ADDR_MAPPING_REG0 0xa << 3
+#define BRCM_ZSC_SCB0_ADDR_MAPPING_REG1 0xc << 3
+
+#define BRCM_ZSC_SCB1_ADDR_MAPPING_REG0 0xe << 3
+#define BRCM_ZSC_SCB1_ADDR_MAPPING_REG1 0x10 << 3
+
+#define BRCM_ZSC_CONFIG_LMB1En 1 << (15)
+#define BRCM_ZSC_CONFIG_LMB0En 1 << (14)
+
+/* branch predition values */
+
+#define BRCM_BrPRED_ALL_TAKEN (0x0)
+#define BRCM_BrPRED_ALL_NOT_TAKEN (0x1)
+#define BRCM_BrPRED_BHT_ENABLE (0x2)
+#define BRCM_BrPRED_PREDICT_BACKWARD (0x3)
+
+
+
+.align 2
+/*
+ * Function: size_i_cache
+ * Arguments: None
+ * Returns: v0 = i cache size, v1 = I cache line size
+ * Description: compute the I-cache size and I-cache line size
+ * Trashes: v0, v1, a0, t0
+ *
+ * pseudo code:
+ *
+ */
+
+LEAF(size_i_cache)
+ .set noreorder
+
+ mfc0 a0, CP0_CONFIG, 1
+ move t0, a0
+
+ /*
+ * Determine sets per way: IS
+ *
+ * This field contains the number of sets (i.e., indices) per way of
+ * the instruction cache:
+ * i) 0x0: 64, ii) 0x1: 128, iii) 0x2: 256, iv) 0x3: 512, v) 0x4: 1k
+ * vi) 0x5 - 0x7: Reserved.
+ */
+
+ srl a0, a0, IS_SHIFT
+ and a0, a0, IS_MASK
+
+ /* sets per way = (64<<IS) */
+
+ li v0, 0x40
+ sllv v0, v0, a0
+
+ /*
+ * Determine line size
+ *
+ * This field contains the line size of the instruction cache:
+ * i) 0x0: No I-cache present, i) 0x3: 16 bytes, ii) 0x4: 32 bytes, iii)
+ * 0x5: 64 bytes, iv) the rest: Reserved.
+ */
+
+ move a0, t0
+
+ srl a0, a0, IL_SHIFT
+ and a0, a0, IL_MASK
+
+ beqz a0, no_i_cache
+ nop
+
+ /* line size = 2 ^ (IL+1) */
+
+ addi a0, a0, 1
+ li v1, 1
+ sll v1, v1, a0
+
+ /* v0 now have sets per way, multiply it by line size now
+ * that will give the set size
+ */
+
+ sll v0, v0, a0
+
+ /*
+ * Determine set associativity
+ *
+ * This field contains the set associativity of the instruction cache.
+ * i) 0x0: Direct mapped, ii) 0x1: 2-way, iii) 0x2: 3-way, iv) 0x3:
+ * 4-way, v) 0x4 - 0x7: Reserved.
+ */
+
+ move a0, t0
+
+ srl a0, a0, IA_SHIFT
+ and a0, a0, IA_MASK
+ addi a0, a0, 0x1
+
+ /* v0 has the set size, multiply it by
+ * set associativiy, to get the cache size
+ */
+
+ multu v0, a0 /*multu is interlocked, so no need to insert nops */
+ mflo v0
+ b 1f
+ nop
+
+no_i_cache:
+ move v0, zero
+ move v1, zero
+1:
+ jr ra
+ nop
+ .set reorder
+
+END(size_i_cache)
+
+/*
+ * Function: size_d_cache
+ * Arguments: None
+ * Returns: v0 = d cache size, v1 = d cache line size
+ * Description: compute the D-cache size and D-cache line size.
+ * Trashes: v0, v1, a0, t0
+ *
+ */
+
+LEAF(size_d_cache)
+ .set noreorder
+
+ mfc0 a0, CP0_CONFIG, 1
+ move t0, a0
+
+ /*
+ * Determine sets per way: IS
+ *
+ * This field contains the number of sets (i.e., indices) per way of
+ * the instruction cache:
+ * i) 0x0: 64, ii) 0x1: 128, iii) 0x2: 256, iv) 0x3: 512, v) 0x4: 1k
+ * vi) 0x5 - 0x7: Reserved.
+ */
+
+ srl a0, a0, DS_SHIFT
+ and a0, a0, DS_MASK
+
+ /* sets per way = (64<<IS) */
+
+ li v0, 0x40
+ sllv v0, v0, a0
+
+ /*
+ * Determine line size
+ *
+ * This field contains the line size of the instruction cache:
+ * i) 0x0: No I-cache present, i) 0x3: 16 bytes, ii) 0x4: 32 bytes, iii)
+ * 0x5: 64 bytes, iv) the rest: Reserved.
+ */
+ move a0, t0
+
+ srl a0, a0, DL_SHIFT
+ and a0, a0, DL_MASK
+
+ beqz a0, no_d_cache
+ nop
+
+ /* line size = 2 ^ (IL+1) */
+
+ addi a0, a0, 1
+ li v1, 1
+ sll v1, v1, a0
+
+ /* v0 now have sets per way, multiply it by line size now
+ * that will give the set size
+ */
+
+ sll v0, v0, a0
+
+ /* determine set associativity
+ *
+ * This field contains the set associativity of the instruction cache.
+ * i) 0x0: Direct mapped, ii) 0x1: 2-way, iii) 0x2: 3-way, iv) 0x3:
+ * 4-way, v) 0x4 - 0x7: Reserved.
+ */
+
+ move a0, t0
+
+ srl a0, a0, DA_SHIFT
+ and a0, a0, DA_MASK
+ addi a0, a0, 0x1
+
+ /* v0 has the set size, multiply it by
+ * set associativiy, to get the cache size
+ */
+
+ multu v0, a0 /*multu is interlocked, so no need to insert nops */
+ mflo v0
+
+ b 1f
+ nop
+
+no_d_cache:
+ move v0, zero
+ move v1, zero
+1:
+ jr ra
+ nop
+ .set reorder
+
+END(size_d_cache)
+
+
+/*
+ * Function: enable_ID
+ * Arguments: None
+ * Returns: None
+ * Description: Enable I and D caches, initialize I and D-caches, also set
+ * hardware delay for d-cache (TP0).
+ * Trashes: t0
+ *
+ */
+ .global enable_ID
+ .ent enable_ID
+ .set noreorder
+enable_ID:
+ mfc0 t0, CP0_BRCM_CONFIG0
+ or t0, t0, (ICE_MASK | DCE_MASK)
+ mtc0 t0, CP0_BRCM_CONFIG0
+ jr ra
+ nop
+
+ .end enable_ID
+ .set reorder
+
+
+/*
+ * Function: l1_init
+ * Arguments: None
+ * Returns: None
+ * Description: Enable I and D caches, and initialize I and D-caches
+ * Trashes: a0, v0, v1, t0, t1, t2, t8
+ *
+ */
+ .globl l1_init
+ .ent l1_init
+ .set noreorder
+l1_init:
+
+ /* save return address */
+ move t8, ra
+
+
+ /* initialize I and D cache Data and Tag registers. */
+ mtc0 zero, CP0_ICACHE_TAG_LO
+ mtc0 zero, CP0_ICACHE_TAG_HI
+ mtc0 zero, CP0_ICACHE_DATA_LO
+ mtc0 zero, CP0_ICACHE_DATA_HI
+ mtc0 zero, CP0_DCACHE_TAG_LO
+ mtc0 zero, CP0_DCACHE_TAG_HI
+
+ /* Enable Caches before Clearing. If the caches are disabled
+ * then the cache operations to clear the cache will be ignored
+ */
+
+ jal enable_ID
+ nop
+
+ jal size_i_cache /* v0 = i-cache size, v1 = i-cache line size */
+ nop
+
+ /* run uncached in kseg 1 */
+ la k0, 1f
+ lui k1, 0x2000
+ or k0, k1, k0
+ jr k0
+ nop
+1:
+
+ /*
+ * set K0 cache mode
+ */
+
+ mfc0 t0, CP0_CONFIG
+ and t0, t0, ~CP0_CONFIG_K0_MASK
+ or t0, t0, 3 /* Write Back mode */
+ mtc0 t0, CP0_CONFIG
+
+ /*
+ * Initialize instruction cache.
+ */
+
+ li a0, KSEG0
+ cacheop(a0, v0, v1, Index_Store_Tag_I)
+
+ /*
+ * Now we can run from I-$, kseg 0
+ */
+ la k0, 1f
+ lui k1, 0x2000
+ or k0, k1, k0
+ xor k0, k1, k0
+ jr k0
+ nop
+1:
+ /*
+ * Initialize data cache.
+ */
+
+ jal size_d_cache /* v0 = d-cache size, v1 = d-cache line size */
+ nop
+
+
+ li a0, KSEG0
+ cacheop(a0, v0, v1, Index_Store_Tag_D)
+
+ jr t8
+ nop
+
+ .end l1_init
+ .set reorder
+
+
+/*
+ * Function: set_other_config
+ * Arguments: none
+ * Returns: None
+ * Description: initialize other remainder configuration to defaults.
+ * Trashes: t0, t1
+ *
+ * pseudo code:
+ *
+ */
+LEAF(set_other_config)
+ .set noreorder
+
+ /* enable Bus error for I-fetch */
+ mfc0 t0, CP0_CACHEERR, 0
+ li t1, 0x4
+ or t0, t1
+ mtc0 t0, CP0_CACHEERR, 0
+
+ /* enable Bus error for Load */
+ mfc0 t0, CP0_CACHEERR, 1
+ li t1, 0x4
+ or t0, t1
+ mtc0 t0, CP0_CACHEERR, 1
+
+ /* enable Bus Error for Store */
+ mfc0 t0, CP0_CACHEERR, 2
+ li t1, 0x4
+ or t0, t1
+ mtc0 t0, CP0_CACHEERR, 2
+
+ jr ra
+ nop
+ .set reorder
+END(set_other_config)
+
+/*
+ * Function: set_branch_pred
+ * Arguments: none
+ * Returns: None
+ * Description:
+ * Trashes: t0, t1
+ *
+ * pseudo code:
+ *
+ */
+
+LEAF(set_branch_pred)
+ .set noreorder
+ mfc0 t0, CP0_BRCM_MODE
+ li t1, ~(CP0_BRCM_MODE_BrPRED_MASK | CP0_BRCM_MODE_BrHIST_MASK )
+ and t0, t0, t1
+
+ /* enable Branch prediction */
+ li t1, BRCM_BrPRED_BHT_ENABLE
+ sll t1, CP0_BRCM_MODE_BrPRED_SHIFT
+ or t0, t0, t1
+
+ /* set history count to 8 */
+ li t1, 8
+ sll t1, CP0_BRCM_MODE_BrHIST_SHIFT
+ or t0, t0, t1
+
+ mtc0 t0, CP0_BRCM_MODE
+ jr ra
+ nop
+ .set reorder
+END(set_branch_pred)
+
+
+/*
+ * Function: set_luc
+ * Arguments: set link uncached.
+ * Returns: None
+ * Description:
+ * Trashes: t0, t1
+ *
+ */
+LEAF(set_luc)
+ .set noreorder
+ mfc0 t0, CP0_BRCM_MODE
+ li t1, ~(CP0_BRCM_MODE_Luc_MASK)
+ and t0, t0, t1
+
+ /* set Luc */
+ ori t0, t0, CP0_BRCM_MODE_Luc_MASK
+
+ mtc0 t0, CP0_BRCM_MODE
+ jr ra
+ nop
+ .set reorder
+END(set_luc)
+
+/*
+ * Function: set_cwf_tse
+ * Arguments: set CWF and TSE bits
+ * Returns: None
+ * Description:
+ * Trashes: t0, t1
+ *
+ */
+LEAF(set_cwf_tse)
+ .set noreorder
+ mfc0 t0, CP0_BRCM_CONFIG0
+ li t1, (CP0_BRCM_CONFIG0_CWF_MASK | CP0_BRCM_CONFIG0_TSE_MASK)
+ or t0, t0, t1
+
+ mtc0 t0, CP0_BRCM_CONFIG0
+ jr ra
+ nop
+ .set reorder
+END(set_cwf_tse)
+
+/*
+ * Function: set_clock_ratio
+ * Arguments: set clock ratio specified by a0
+ * Returns: None
+ * Description:
+ * Trashes: v0, v1, a0, a1
+ *
+ * pseudo code:
+ *
+ */
+LEAF(set_clock_ratio)
+ .set noreorder
+
+ mfc0 t0, CP0_BRCM_MODE
+ li t1, ~(CP0_BRCM_MODE_SET_MASK | CP0_BRCM_MODE_ClkRATIO_MASK)
+ and t0, t0, t1
+ li t1, CP0_BRCM_MODE_SET_MASK
+ or t0, t0, t1
+ or t0, t0, a0
+ mtc0 t0, CP0_BRCM_MODE
+ jr ra
+ nop
+ .set reorder
+END(set_clock_ratio)
+/*
+ * Function: set_zephyr
+ * Arguments: None
+ * Returns: None
+ * Description: Set any zephyr bits
+ * Trashes: t0 & t1
+ *
+ */
+LEAF(set_zephyr)
+ .set noreorder
+
+ /* enable read/write of CP0 #22 sel. 8 */
+ li t0, 0x5a455048
+ .word 0x4088b00f /* mtc0 t0, $22, 15 */
+
+ .word 0x4008b008 /* mfc0 t0, $22, 8 */
+ li t1, 0x09008000 /* turn off pref, jtb */
+ or t0, t0, t1
+ .word 0x4088b008 /* mtc0 t0, $22, 8 */
+ sync
+
+ /* disable read/write of CP0 #22 sel 8 */
+ li t0, 0x0
+ .word 0x4088b00f /* mtc0 t0, $22, 15 */
+
+
+ jr ra
+ nop
+ .set reorder
+
+END(set_zephyr)
+
+
+/*
+ * Function: set_llmb
+ * Arguments: a0=0 disable llmb, a0=1 enables llmb
+ * Returns: None
+ * Description:
+ * Trashes: t0, t1, t2
+ *
+ * pseudo code:
+ *
+ */
+LEAF(set_llmb)
+ .set noreorder
+
+ li t2, 0x90000000 | BRCM_ZSC_ALL_REGS_SELECT | BRCM_ZSC_CONFIG_REG
+ sync
+ cache 0x7, 0x0(t2)
+ sync
+ mfc0 t0, CP0_D_SEC_CACHE_DATA_LO
+ li t1, ~(BRCM_ZSC_CONFIG_LMB1En | BRCM_ZSC_CONFIG_LMB0En)
+ and t0, t0, t1
+
+ beqz a0, svlmb
+ nop
+
+enable_lmb:
+ li t1, (BRCM_ZSC_CONFIG_LMB1En | BRCM_ZSC_CONFIG_LMB0En)
+ or t0, t0, t1
+
+svlmb:
+ mtc0 t0, CP0_D_SEC_CACHE_DATA_LO
+ sync
+ cache 0xb, 0x0(t2)
+ sync
+
+ jr ra
+ nop
+ .set reorder
+
+END(set_llmb)
+/*
+ * Function: core_init
+ * Arguments: none
+ * Returns: None
+ * Description: initialize core related configuration
+ * Trashes: v0,v1,a0,a1,t8
+ *
+ * pseudo code:
+ *
+ */
+ .globl core_init
+ .ent core_init
+ .set noreorder
+core_init:
+ move t8, ra
+
+ /* set Zephyr bits. */
+ bal set_zephyr
+ nop
+
+#if ENABLE_FPU==1
+ /* initialize the Floating point unit (both TPs) */
+ bal init_fpu
+ nop
+#endif
+
+ /* set low latency memory bus */
+ li a0, 1
+ bal set_llmb
+ nop
+
+ /* set branch prediction (TP0 only) */
+ bal set_branch_pred
+ nop
+
+ /* set link uncached */
+ bal set_luc
+ nop
+
+ /* set CWF and TSE */
+ bal set_cwf_tse
+ nop
+
+ /*
+ *set clock ratio by setting 1 to 'set'
+ * and 0 to ClkRatio, (TP0 only)
+ */
+ li a0, 0
+ bal set_clock_ratio
+ nop
+
+ /* set other configuration to defaults */
+ bal set_other_config
+ nop
+
+ move ra, t8
+ jr ra
+ nop
+
+ .set reorder
+ .end core_init
+
+/*
+ * Function: clear_jump_target_buffer
+ * Arguments: None
+ * Returns: None
+ * Description:
+ * Trashes: t0, t1, t2
+ *
+ */
+#define RESET_CALL_RETURN_STACK_THIS_THREAD (0x06<<16)
+#define RESET_JUMP_TARGET_BUFFER_THIS_THREAD (0x04<<16)
+#define JTB_CS_CNTL_MASK (0xFF<<16)
+
+ .globl clear_jump_target_buffer
+ .ent clear_jump_target_buffer
+ .set noreorder
+clear_jump_target_buffer:
+
+ mfc0 t0, $22, 2
+ nop
+ nop
+
+ li t1, ~JTB_CS_CNTL_MASK
+ and t0, t0, t1
+ li t2, RESET_CALL_RETURN_STACK_THIS_THREAD
+ or t0, t0, t2
+ mtc0 t0, $22, 2
+ nop
+ nop
+
+ and t0, t0, t1
+ li t2, RESET_JUMP_TARGET_BUFFER_THIS_THREAD
+ or t0, t0, t2
+ mtc0 t0, $22, 2
+ nop
+ nop
+ jr ra
+ nop
+
+ .end clear_jump_target_buffer
+ .set reorder
+/*
+ * Function: bmips_cache_init
+ * Arguments: None
+ * Returns: None
+ * Description: Enable I and D caches, and initialize I and D-caches
+ * Trashes: v0, v1, t0, t1, t2, t5, t7, t8
+ *
+ */
+ .globl bmips_5xxx_init
+ .ent bmips_5xxx_init
+ .set noreorder
+bmips_5xxx_init:
+
+ /* save return address and A0 */
+ move t7, ra
+ move t5, a0
+
+ jal l1_init
+ nop
+
+ jal core_init
+ nop
+
+ jal clear_jump_target_buffer
+ nop
+
+ mtc0 zero, CP0_CAUSE
+
+ move a0, t5
+ jr t7
+ nop
+
+ .end bmips_5xxx_init
+ .set reorder
+
+
+#endif
projects / kernel.git / commitdiff