1/*
  2 * Copyright 2003-2011 NetLogic Microsystems, Inc. (NetLogic). All rights
  3 * reserved.
  4 *
  5 * This software is available to you under a choice of one of two
  6 * licenses.  You may choose to be licensed under the terms of the GNU
  7 * General Public License (GPL) Version 2, available from the file
  8 * COPYING in the main directory of this source tree, or the NetLogic
  9 * license below:
 10 *
 11 * Redistribution and use in source and binary forms, with or without
 12 * modification, are permitted provided that the following conditions
 13 * are met:
 14 *
 15 * 1. Redistributions of source code must retain the above copyright
 16 *    notice, this list of conditions and the following disclaimer.
 17 * 2. Redistributions in binary form must reproduce the above copyright
 18 *    notice, this list of conditions and the following disclaimer in
 19 *    the documentation and/or other materials provided with the
 20 *    distribution.
 21 *
 22 * THIS SOFTWARE IS PROVIDED BY NETLOGIC ``AS IS'' AND ANY EXPRESS OR
 23 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
 24 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 25 * ARE DISCLAIMED. IN NO EVENT SHALL NETLOGIC OR CONTRIBUTORS BE LIABLE
 26 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
 27 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
 28 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
 29 * BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
 30 * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE
 31 * OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN
 32 * IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 33 */
 34
 35#include <linux/init.h>
 36#include <linux/kernel.h>
 37#include <linux/threads.h>
 38
 39#include <asm/asm.h>
 40#include <asm/asm-offsets.h>
 41#include <asm/mipsregs.h>
 42#include <asm/addrspace.h>
 43#include <asm/string.h>
 44
 45#include <asm/netlogic/haldefs.h>
 46#include <asm/netlogic/common.h>
 47#include <asm/netlogic/mips-extns.h>
 48
 49#include <asm/netlogic/xlp-hal/iomap.h>
 50#include <asm/netlogic/xlp-hal/pic.h>
 51#include <asm/netlogic/xlp-hal/xlp.h>
 52#include <asm/netlogic/xlp-hal/sys.h>
 53
 54static void xlp_enable_secondary_cores(void)
 55{
 56	uint32_t core, value, coremask, syscoremask;
 57	int count;
 58
 59	/* read cores in reset from SYS block */
 60	syscoremask = nlm_read_sys_reg(nlm_sys_base, SYS_CPU_RESET);
 61
 62	/* update user specified */
 63	nlm_coremask = nlm_coremask & (syscoremask | 1);
 64
 65	for (core = 1; core < 8; core++) {
 66		coremask = 1 << core;
 67		if ((nlm_coremask & coremask) == 0)
 68			continue;
 69
 70		/* Enable CPU clock */
 71		value = nlm_read_sys_reg(nlm_sys_base, SYS_CORE_DFS_DIS_CTRL);
 72		value &= ~coremask;
 73		nlm_write_sys_reg(nlm_sys_base, SYS_CORE_DFS_DIS_CTRL, value);
 74
 75		/* Remove CPU Reset */
 76		value = nlm_read_sys_reg(nlm_sys_base, SYS_CPU_RESET);
 77		value &= ~coremask;
 78		nlm_write_sys_reg(nlm_sys_base, SYS_CPU_RESET, value);
 79
 80		/* Poll for CPU to mark itself coherent */
 81		count = 100000;
 82		do {
 83			value = nlm_read_sys_reg(nlm_sys_base,
 84			    SYS_CPU_NONCOHERENT_MODE);
 85		} while ((value & coremask) != 0 && count-- > 0);
 86
 87		if (count == 0)
 88			pr_err("Failed to enable core %d\n", core);
 89	}
 90}
 91
 92void xlp_wakeup_secondary_cpus(void)
 93{
 94	/*
 95	 * In case of u-boot, the secondaries are in reset
 96	 * first wakeup core 0 threads
 97	 */
 98	xlp_boot_core0_siblings();
 99
100	/* now get other cores out of reset */
101	xlp_enable_secondary_cores();
102}