arch/mips/netlogic/common/reset.S - linux-imx - Git at Google

 /*
  * Copyright 2003-2013 Broadcom Corporation.
  * All Rights Reserved.
  *
  * This software is available to you under a choice of one of two
  * licenses.  You may choose to be licensed under the terms of the GNU
  * General Public License (GPL) Version 2, available from the file
  * COPYING in the main directory of this source tree, or the Broadcom
  * license below:
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  *
  * 1. Redistributions of source code must retain the above copyright
  *    notice, this list of conditions and the following disclaimer.
  * 2. Redistributions in binary form must reproduce the above copyright
  *    notice, this list of conditions and the following disclaimer in
  *    the documentation and/or other materials provided with the
  *    distribution.
  *
  * THIS SOFTWARE IS PROVIDED BY BROADCOM ``AS IS'' AND ANY EXPRESS OR
  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
  * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  * ARE DISCLAIMED. IN NO EVENT SHALL BROADCOM OR CONTRIBUTORS BE LIABLE
  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
  * BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
  * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE
  * OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN
  * IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  */


 #include <asm/asm.h>
 #include <asm/asm-offsets.h>
 #include <asm/cpu.h>
 #include <asm/cacheops.h>
 #include <asm/regdef.h>
 #include <asm/mipsregs.h>
 #include <asm/stackframe.h>
 #include <asm/asmmacro.h>
 #include <asm/addrspace.h>

 #include <asm/netlogic/common.h>

 #include <asm/netlogic/xlp-hal/iomap.h>
 #include <asm/netlogic/xlp-hal/xlp.h>
 #include <asm/netlogic/xlp-hal/sys.h>
 #include <asm/netlogic/xlp-hal/cpucontrol.h>

 #define SYS_CPU_COHERENT_BASE	CKSEG1ADDR(XLP_DEFAULT_IO_BASE) + \
 			XLP_IO_SYS_OFFSET(0) + XLP_IO_PCI_HDRSZ + \
 			SYS_CPU_NONCOHERENT_MODE * 4

 /* Enable XLP features and workarounds in the LSU */
 .macro xlp_config_lsu
 	li	t0, LSU_DEFEATURE
 	mfcr	t1, t0

 	lui	t2, 0x4080	/* Enable Unaligned Access, L2HPE */
 	or	t1, t1, t2
 	mtcr	t1, t0

 	li	t0, ICU_DEFEATURE
 	mfcr	t1, t0
 	ori	t1, 0x1000	/* Enable Icache partitioning */
 	mtcr	t1, t0

 	li	t0, SCHED_DEFEATURE
 	lui	t1, 0x0100	/* Disable BRU accepting ALU ops */
 	mtcr	t1, t0
 .endm

 /*
  * Allow access to physical mem >64G by enabling ELPA in PAGEGRAIN
  * register. This is needed before going to C code since the SP can
  * in this region. Called from all HW threads.
  */
 .macro xlp_early_mmu_init
 	mfc0	t0, CP0_PAGEMASK, 1
 	li	t1, (1 << 29)		/* ELPA bit */
 	or	t0, t1
 	mtc0	t0, CP0_PAGEMASK, 1
 .endm

 /*
  * L1D cache has to be flushed before enabling threads in XLP.
  * On XLP8xx/XLP3xx, we do a low level flush using processor control
  * registers. On XLPII CPUs, usual cache instructions work.
  */
 .macro	xlp_flush_l1_dcache
 	mfc0	t0, CP0_PRID
 	andi	t0, t0, PRID_IMP_MASK
 	slt	t1, t0, 0x1200
 	beqz	t1, 15f
 	nop

 	/* XLP8xx low level cache flush */
 	li	t0, LSU_DEBUG_DATA0
 	li	t1, LSU_DEBUG_ADDR
 	li	t2, 0		/* index */
 	li	t3, 0x1000	/* loop count */
 11:
 	sll	v0, t2, 5
 	mtcr	zero, t0
 	ori	v1, v0, 0x3	/* way0 | write_enable | write_active */
 	mtcr	v1, t1
 12:
 	mfcr	v1, t1
 	andi	v1, 0x1		/* wait for write_active == 0 */
 	bnez	v1, 12b
 	nop
 	mtcr	zero, t0
 	ori	v1, v0, 0x7	/* way1 | write_enable | write_active */
 	mtcr	v1, t1
 13:
 	mfcr	v1, t1
 	andi	v1, 0x1		/* wait for write_active == 0 */
 	bnez	v1, 13b
 	nop
 	addi	t2, 1
 	bne	t3, t2, 11b
 	nop
 	b	17f
 	nop

 	/* XLPII CPUs, Invalidate all 64k of L1 D-cache */
 15:
 	li	t0, 0x80000000
 	li	t1, 0x80010000
 16:	cache	Index_Writeback_Inv_D, 0(t0)
 	addiu	t0, t0, 32
 	bne	t0, t1, 16b
 	nop
 17:
 .endm

 /*
  * nlm_reset_entry will be copied to the reset entry point for
  * XLR and XLP. The XLP cores start here when they are woken up. This
  * is also the NMI entry point.
  *
  * We use scratch reg 6/7 to save k0/k1 and check for NMI first.
  *
  * The data corresponding to reset/NMI is stored at RESET_DATA_PHYS
  * location, this will have the thread mask (used when core is woken up)
  * and the current NMI handler in case we reached here for an NMI.
  *
  * When a core or thread is newly woken up, it marks itself ready and
  * loops in a 'wait'. When the CPU really needs waking up, we send an NMI
  * IPI to it, with the NMI handler set to prom_boot_secondary_cpus
  */
 	.set	noreorder
 	.set	noat
 	.set	arch=xlr	/* for mfcr/mtcr, XLR is sufficient */

 FEXPORT(nlm_reset_entry)
 	dmtc0	k0, $22, 6
 	dmtc0	k1, $22, 7
 	mfc0	k0, CP0_STATUS
 	li	k1, 0x80000
 	and	k1, k0, k1
 	beqz	k1, 1f		/* go to real reset entry */
 	nop
 	li	k1, CKSEG1ADDR(RESET_DATA_PHYS) /* NMI */
 	ld	k0, BOOT_NMI_HANDLER(k1)
 	jr	k0
 	nop

 1:	/* Entry point on core wakeup */
 	mfc0	t0, CP0_PRID		/* processor ID */
 	andi	t0, PRID_IMP_MASK
 	li	t1, 0x1500		/* XLP 9xx */
 	beq	t0, t1, 2f		/* does not need to set coherent */
 	nop

 	li	t1, 0x1300		/* XLP 5xx */
 	beq	t0, t1, 2f		/* does not need to set coherent */
 	nop

 	/* set bit in SYS coherent register for the core */
 	mfc0	t0, CP0_EBASE
 	mfc0	t1, CP0_EBASE
 	srl	t1, 5
 	andi	t1, 0x3			/* t1 <- node */
 	li	t2, 0x40000
 	mul	t3, t2, t1		/* t3 = node * 0x40000 */
 	srl	t0, t0, 2
 	and	t0, t0, 0x7		/* t0 <- core */
 	li	t1, 0x1
 	sll	t0, t1, t0
 	nor	t0, t0, zero		/* t0 <- ~(1 << core) */
 	li	t2, SYS_CPU_COHERENT_BASE
 	add	t2, t2, t3		/* t2 <- SYS offset for node */
 	lw	t1, 0(t2)
 	and	t1, t1, t0
 	sw	t1, 0(t2)

 	/* read back to ensure complete */
 	lw	t1, 0(t2)
 	sync

 2:
 	/* Configure LSU on Non-0 Cores. */
 	xlp_config_lsu
 	/* FALL THROUGH */

 /*
  * Wake up sibling threads from the initial thread in a core.
  */
 EXPORT(nlm_boot_siblings)
 	/* core L1D flush before enable threads */
 	xlp_flush_l1_dcache
 	/* save ra and sp, will be used later (only for boot cpu) */
 	dmtc0	ra, $22, 6
 	dmtc0	sp, $22, 7
 	/* Enable hw threads by writing to MAP_THREADMODE of the core */
 	li	t0, CKSEG1ADDR(RESET_DATA_PHYS)
 	lw	t1, BOOT_THREAD_MODE(t0)	/* t1 <- thread mode */
 	li	t0, ((CPU_BLOCKID_MAP << 8) | MAP_THREADMODE)
 	mfcr	t2, t0
 	or	t2, t2, t1
 	mtcr	t2, t0

 	/*
 	 * The new hardware thread starts at the next instruction
 	 * For all the cases other than core 0 thread 0, we will
 	 * jump to the secondary wait function.

 	 * NOTE: All GPR contents are lost after the mtcr above!
 	 */
 	mfc0	v0, CP0_EBASE
 	andi	v0, 0x3ff		/* v0 <- node/core */

 	/*
 	 * Errata: to avoid potential live lock, setup IFU_BRUB_RESERVE
 	 * when running 4 threads per core
 	 */
 	andi	v1, v0, 0x3             /* v1 <- thread id */
 	bnez	v1, 2f
 	nop

 	/* thread 0 of each core. */
 	li	t0, CKSEG1ADDR(RESET_DATA_PHYS)
 	lw	t1, BOOT_THREAD_MODE(t0)        /* t1 <- thread mode */
 	subu	t1, 0x3				/* 4-thread per core mode? */
 	bnez	t1, 2f
 	nop

 	li	t0, IFU_BRUB_RESERVE
 	li	t1, 0x55
 	mtcr	t1, t0
 	_ehb
 2:
 	beqz	v0, 4f		/* boot cpu (cpuid == 0)? */
 	nop

 	/* setup status reg */
 	move	t1, zero
 #ifdef CONFIG_64BIT
 	ori	t1, ST0_KX
 #endif
 	mtc0	t1, CP0_STATUS

 	xlp_early_mmu_init

 	/* mark CPU ready */
 	li	t3, CKSEG1ADDR(RESET_DATA_PHYS)
 	ADDIU	t1, t3, BOOT_CPU_READY
 	sll	v1, v0, 2
 	PTR_ADDU t1, v1
 	li	t2, 1
 	sw	t2, 0(t1)
 	/* Wait until NMI hits */
 3:	wait
 	b	3b
 	nop

 	/*
 	 * For the boot CPU, we have to restore ra and sp and return, rest
 	 * of the registers will be restored by the caller
 	 */
 4:
 	dmfc0	ra, $22, 6
 	dmfc0	sp, $22, 7
 	jr	ra
 	nop
 EXPORT(nlm_reset_entry_end)

 LEAF(nlm_init_boot_cpu)
 #ifdef CONFIG_CPU_XLP
 	xlp_config_lsu
 	xlp_early_mmu_init
 #endif
 	jr	ra
 	nop
 END(nlm_init_boot_cpu)
	/*
	* Copyright 2003-2013 Broadcom Corporation.
	* All Rights Reserved.
	*
	* This software is available to you under a choice of one of two
	* licenses. You may choose to be licensed under the terms of the GNU
	* General Public License (GPL) Version 2, available from the file
	* COPYING in the main directory of this source tree, or the Broadcom
	* license below:
	*
	* Redistribution and use in source and binary forms, with or without
	* modification, are permitted provided that the following conditions
	* are met:
	*
	* 1. Redistributions of source code must retain the above copyright
	* notice, this list of conditions and the following disclaimer.
	* 2. Redistributions in binary form must reproduce the above copyright
	* notice, this list of conditions and the following disclaimer in
	* the documentation and/or other materials provided with the
	* distribution.
	*
	* THIS SOFTWARE IS PROVIDED BY BROADCOM ``AS IS'' AND ANY EXPRESS OR
	* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
	* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
	* ARE DISCLAIMED. IN NO EVENT SHALL BROADCOM OR CONTRIBUTORS BE LIABLE
	* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
	* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
	* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
	* BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
	* WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE
	* OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN
	* IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
	*/


	#include <asm/asm.h>
	#include <asm/asm-offsets.h>
	#include <asm/cpu.h>
	#include <asm/cacheops.h>
	#include <asm/regdef.h>
	#include <asm/mipsregs.h>
	#include <asm/stackframe.h>
	#include <asm/asmmacro.h>
	#include <asm/addrspace.h>

	#include <asm/netlogic/common.h>

	#include <asm/netlogic/xlp-hal/iomap.h>
	#include <asm/netlogic/xlp-hal/xlp.h>
	#include <asm/netlogic/xlp-hal/sys.h>
	#include <asm/netlogic/xlp-hal/cpucontrol.h>

	#define SYS_CPU_COHERENT_BASE CKSEG1ADDR(XLP_DEFAULT_IO_BASE) + \
	XLP_IO_SYS_OFFSET(0) + XLP_IO_PCI_HDRSZ + \
	SYS_CPU_NONCOHERENT_MODE * 4

	/* Enable XLP features and workarounds in the LSU */
	.macro xlp_config_lsu
	li t0, LSU_DEFEATURE
	mfcr t1, t0

	lui t2, 0x4080 /* Enable Unaligned Access, L2HPE */
	or t1, t1, t2
	mtcr t1, t0

	li t0, ICU_DEFEATURE
	mfcr t1, t0
	ori t1, 0x1000 /* Enable Icache partitioning */
	mtcr t1, t0

	li t0, SCHED_DEFEATURE
	lui t1, 0x0100 /* Disable BRU accepting ALU ops */
	mtcr t1, t0
	.endm

	/*
	* Allow access to physical mem >64G by enabling ELPA in PAGEGRAIN
	* register. This is needed before going to C code since the SP can
	* in this region. Called from all HW threads.
	*/
	.macro xlp_early_mmu_init
	mfc0 t0, CP0_PAGEMASK, 1
	li t1, (1 << 29) /* ELPA bit */
	or t0, t1
	mtc0 t0, CP0_PAGEMASK, 1
	.endm

	/*
	* L1D cache has to be flushed before enabling threads in XLP.
	* On XLP8xx/XLP3xx, we do a low level flush using processor control
	* registers. On XLPII CPUs, usual cache instructions work.
	*/
	.macro xlp_flush_l1_dcache
	mfc0 t0, CP0_PRID
	andi t0, t0, PRID_IMP_MASK
	slt t1, t0, 0x1200
	beqz t1, 15f
	nop

	/* XLP8xx low level cache flush */
	li t0, LSU_DEBUG_DATA0
	li t1, LSU_DEBUG_ADDR
	li t2, 0 /* index */
	li t3, 0x1000 /* loop count */
	11:
	sll v0, t2, 5
	mtcr zero, t0
	ori v1, v0, 0x3 /* way0 \| write_enable \| write_active */
	mtcr v1, t1
	12:
	mfcr v1, t1
	andi v1, 0x1 /* wait for write_active == 0 */
	bnez v1, 12b
	nop
	mtcr zero, t0
	ori v1, v0, 0x7 /* way1 \| write_enable \| write_active */
	mtcr v1, t1
	13:
	mfcr v1, t1
	andi v1, 0x1 /* wait for write_active == 0 */
	bnez v1, 13b
	nop
	addi t2, 1
	bne t3, t2, 11b
	nop
	b 17f
	nop

	/* XLPII CPUs, Invalidate all 64k of L1 D-cache */
	15:
	li t0, 0x80000000
	li t1, 0x80010000
	16: cache Index_Writeback_Inv_D, 0(t0)
	addiu t0, t0, 32
	bne t0, t1, 16b
	nop
	17:
	.endm

	/*
	* nlm_reset_entry will be copied to the reset entry point for
	* XLR and XLP. The XLP cores start here when they are woken up. This
	* is also the NMI entry point.
	*
	* We use scratch reg 6/7 to save k0/k1 and check for NMI first.
	*
	* The data corresponding to reset/NMI is stored at RESET_DATA_PHYS
	* location, this will have the thread mask (used when core is woken up)
	* and the current NMI handler in case we reached here for an NMI.
	*
	* When a core or thread is newly woken up, it marks itself ready and
	* loops in a 'wait'. When the CPU really needs waking up, we send an NMI
	* IPI to it, with the NMI handler set to prom_boot_secondary_cpus
	*/
	.set noreorder
	.set noat
	.set arch=xlr /* for mfcr/mtcr, XLR is sufficient */

	FEXPORT(nlm_reset_entry)
	dmtc0 k0, $22, 6
	dmtc0 k1, $22, 7
	mfc0 k0, CP0_STATUS
	li k1, 0x80000
	and k1, k0, k1
	beqz k1, 1f /* go to real reset entry */
	nop
	li k1, CKSEG1ADDR(RESET_DATA_PHYS) /* NMI */
	ld k0, BOOT_NMI_HANDLER(k1)
	jr k0
	nop

	1: /* Entry point on core wakeup */
	mfc0 t0, CP0_PRID /* processor ID */
	andi t0, PRID_IMP_MASK
	li t1, 0x1500 /* XLP 9xx */
	beq t0, t1, 2f /* does not need to set coherent */
	nop

	li t1, 0x1300 /* XLP 5xx */
	beq t0, t1, 2f /* does not need to set coherent */
	nop

	/* set bit in SYS coherent register for the core */
	mfc0 t0, CP0_EBASE
	mfc0 t1, CP0_EBASE
	srl t1, 5
	andi t1, 0x3 /* t1 <- node */
	li t2, 0x40000
	mul t3, t2, t1 /* t3 = node * 0x40000 */
	srl t0, t0, 2
	and t0, t0, 0x7 /* t0 <- core */
	li t1, 0x1
	sll t0, t1, t0
	nor t0, t0, zero /* t0 <- ~(1 << core) */
	li t2, SYS_CPU_COHERENT_BASE
	add t2, t2, t3 /* t2 <- SYS offset for node */
	lw t1, 0(t2)
	and t1, t1, t0
	sw t1, 0(t2)

	/* read back to ensure complete */
	lw t1, 0(t2)
	sync

	2:
	/* Configure LSU on Non-0 Cores. */
	xlp_config_lsu
	/* FALL THROUGH */

	/*
	* Wake up sibling threads from the initial thread in a core.
	*/
	EXPORT(nlm_boot_siblings)
	/* core L1D flush before enable threads */
	xlp_flush_l1_dcache
	/* save ra and sp, will be used later (only for boot cpu) */
	dmtc0 ra, $22, 6
	dmtc0 sp, $22, 7
	/* Enable hw threads by writing to MAP_THREADMODE of the core */
	li t0, CKSEG1ADDR(RESET_DATA_PHYS)
	lw t1, BOOT_THREAD_MODE(t0) /* t1 <- thread mode */
	li t0, ((CPU_BLOCKID_MAP << 8) \| MAP_THREADMODE)
	mfcr t2, t0
	or t2, t2, t1
	mtcr t2, t0

	/*
	* The new hardware thread starts at the next instruction
	* For all the cases other than core 0 thread 0, we will
	* jump to the secondary wait function.

	* NOTE: All GPR contents are lost after the mtcr above!
	*/
	mfc0 v0, CP0_EBASE
	andi v0, 0x3ff /* v0 <- node/core */

	/*
	* Errata: to avoid potential live lock, setup IFU_BRUB_RESERVE
	* when running 4 threads per core
	*/
	andi v1, v0, 0x3 /* v1 <- thread id */
	bnez v1, 2f
	nop

	/* thread 0 of each core. */
	li t0, CKSEG1ADDR(RESET_DATA_PHYS)
	lw t1, BOOT_THREAD_MODE(t0) /* t1 <- thread mode */
	subu t1, 0x3 /* 4-thread per core mode? */
	bnez t1, 2f
	nop

	li t0, IFU_BRUB_RESERVE
	li t1, 0x55
	mtcr t1, t0
	_ehb
	2:
	beqz v0, 4f /* boot cpu (cpuid == 0)? */
	nop

	/* setup status reg */
	move t1, zero
	#ifdef CONFIG_64BIT
	ori t1, ST0_KX
	#endif
	mtc0 t1, CP0_STATUS

	xlp_early_mmu_init

	/* mark CPU ready */
	li t3, CKSEG1ADDR(RESET_DATA_PHYS)
	ADDIU t1, t3, BOOT_CPU_READY
	sll v1, v0, 2
	PTR_ADDU t1, v1
	li t2, 1
	sw t2, 0(t1)
	/* Wait until NMI hits */
	3: wait
	b 3b
	nop

	/*
	* For the boot CPU, we have to restore ra and sp and return, rest
	* of the registers will be restored by the caller
	*/
	4:
	dmfc0 ra, $22, 6
	dmfc0 sp, $22, 7
	jr ra
	nop
	EXPORT(nlm_reset_entry_end)

	LEAF(nlm_init_boot_cpu)
	#ifdef CONFIG_CPU_XLP
	xlp_config_lsu
	xlp_early_mmu_init
	#endif
	jr ra
	nop
	END(nlm_init_boot_cpu)