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/*
* Coherency fabric (Aurora) support for Armada 370 and XP platforms.
*
* Copyright (C) 2012 Marvell
*
* Yehuda Yitschak <yehuday@marvell.com>
* Gregory Clement <gregory.clement@free-electrons.com>
* Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
*
* This file is licensed under the terms of the GNU General Public
* License version 2. This program is licensed "as is" without any
* warranty of any kind, whether express or implied.
*
* The Armada 370 and Armada XP SOCs have a coherency fabric which is
* responsible for ensuring hardware coherency between all CPUs and between
* CPUs and I/O masters. This file initializes the coherency fabric and
* supplies basic routines for configuring and controlling hardware coherency
*/
#include <linux/kernel.h>
#include <linux/init.h>
#include <linux/of_address.h>
#include <linux/io.h>
#include <linux/smp.h>
#include <asm/smp_plat.h>
#include "armada-370-xp.h"
/*
* Some functions in this file are called very early during SMP
* initialization. At that time the device tree framework is not yet
* ready, and it is not possible to get the register address to
* ioremap it. That's why the pointer below is given with an initial
* value matching its virtual mapping
*/
static void __iomem *coherency_base = ARMADA_370_XP_REGS_VIRT_BASE + 0x20200;
/* Coherency fabric registers */
#define COHERENCY_FABRIC_CFG_OFFSET 0x4
static struct of_device_id of_coherency_table[] = {
{.compatible = "marvell,coherency-fabric"},
{ /* end of list */ },
};
#ifdef CONFIG_SMP
int coherency_get_cpu_count(void)
{
int reg, cnt;
reg = readl(coherency_base + COHERENCY_FABRIC_CFG_OFFSET);
cnt = (reg & 0xF) + 1;
return cnt;
}
#endif
/* Function defined in coherency_ll.S */
int ll_set_cpu_coherent(void __iomem *base_addr, unsigned int hw_cpu_id);
int set_cpu_coherent(unsigned int hw_cpu_id, int smp_group_id)
{
if (!coherency_base) {
pr_warn("Can't make CPU %d cache coherent.\n", hw_cpu_id);
pr_warn("Coherency fabric is not initialized\n");
return 1;
}
return ll_set_cpu_coherent(coherency_base, hw_cpu_id);
}
int __init coherency_init(void)
{
struct device_node *np;
np = of_find_matching_node(NULL, of_coherency_table);
if (np) {
pr_info("Initializing Coherency fabric\n");
coherency_base = of_iomap(np, 0);
}
return 0;
}
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