arch/mips/netlogic/xlp/wakeup.c

/*
 * Copyright 2003-2011 NetLogic Microsystems, Inc. (NetLogic). 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 NetLogic
 * 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 NETLOGIC ``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 NETLOGIC 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 <linux/init.h>
#include <linux/kernel.h>
#include <linux/threads.h>

#include <asm/asm.h>
#include <asm/asm-offsets.h>
#include <asm/mipsregs.h>
#include <asm/addrspace.h>
#include <asm/string.h>

#include <asm/netlogic/haldefs.h>
#include <asm/netlogic/common.h>
#include <asm/netlogic/mips-extns.h>

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

static int xlp_wakeup_core(uint64_t sysbase, int node, int core)
{
	uint32_t coremask, value;
	int count;

	coremask = (1 << core);

	/* Enable CPU clock */
	value = nlm_read_sys_reg(sysbase, SYS_CORE_DFS_DIS_CTRL);
	value &= ~coremask;
	nlm_write_sys_reg(sysbase, SYS_CORE_DFS_DIS_CTRL, value);

	/* Remove CPU Reset */
	value = nlm_read_sys_reg(sysbase, SYS_CPU_RESET);
	value &= ~coremask;
	nlm_write_sys_reg(sysbase, SYS_CPU_RESET, value);

	/* Poll for CPU to mark itself coherent */
	count = 100000;
	do {
		value = nlm_read_sys_reg(sysbase, SYS_CPU_NONCOHERENT_MODE);
	} while ((value & coremask) != 0 && --count > 0);

	return count != 0;
}

static int wait_for_cpus(int cpu, int bootcpu)
{
	volatile uint32_t *cpu_ready = nlm_get_boot_data(BOOT_CPU_READY);
	int i, count, notready;

	count = 0x20000000;
	do {
		notready = nlm_threads_per_core;
		for (i = 0; i < nlm_threads_per_core; i++)
			if (cpu_ready[cpu + i] || cpu == bootcpu)
				--notready;
	} while (notready != 0 && --count > 0);

	return count != 0;
}

static void xlp_enable_secondary_cores(const cpumask_t *wakeup_mask)
{
	struct nlm_soc_info *nodep;
	uint64_t syspcibase;
	uint32_t syscoremask;
	int core, n, cpu;

	for (n = 0; n < NLM_NR_NODES; n++) {
		syspcibase = nlm_get_sys_pcibase(n);
		if (nlm_read_reg(syspcibase, 0) == 0xffffffff)
			break;

		/* read cores in reset from SYS */
		if (n != 0)
			nlm_node_init(n);
		nodep = nlm_get_node(n);
		syscoremask = nlm_read_sys_reg(nodep->sysbase, SYS_CPU_RESET);
		/* The boot cpu */
		if (n == 0) {
			syscoremask |= 1;
			nodep->coremask = 1;
		}

		for (core = 0; core < NLM_CORES_PER_NODE; core++) {
			/* we will be on node 0 core 0 */
			if (n == 0 && core == 0)
				continue;

			/* see if the core exists */
			if ((syscoremask & (1 << core)) == 0)
				continue;

			/* see if at least the first hw thread is enabled */
			cpu = (n * NLM_CORES_PER_NODE + core)
						* NLM_THREADS_PER_CORE;
			if (!cpumask_test_cpu(cpu, wakeup_mask))
				continue;

			/* wake up the core */
			if (!xlp_wakeup_core(nodep->sysbase, n, core))
				continue;

			/* core is up */
			nodep->coremask |= 1u << core;

			/* spin until the hw threads sets their ready */
			wait_for_cpus(cpu, 0);
		}
	}
}

void xlp_wakeup_secondary_cpus()
{
	/*
	 * In case of u-boot, the secondaries are in reset
	 * first wakeup core 0 threads
	 */
	xlp_boot_core0_siblings();
	wait_for_cpus(0, 0);

	/* now get other cores out of reset */
	xlp_enable_secondary_cores(&nlm_cpumask);
}