mirror of
https://github.com/AuxXxilium/linux_dsm_epyc7002.git
synced 2024-12-13 10:37:45 +07:00
8d7217e5d7
Update the EMEV2 SMP code to access the SMU directly instead of relying on help from the legacy clock code. This change moves us one step closer to common clocks. Signed-off-by: Magnus Damm <damm@opensource.se> Acked-by: Arnd Bergmann <arnd@arndb.de> Signed-off-by: Simon Horman <horms+renesas@verge.net.au>
66 lines
2.0 KiB
C
66 lines
2.0 KiB
C
/*
|
|
* SMP support for Emma Mobile EV2
|
|
*
|
|
* Copyright (C) 2012 Renesas Solutions Corp.
|
|
* Copyright (C) 2012 Magnus Damm
|
|
*
|
|
* This program is free software; you can redistribute it and/or modify
|
|
* it under the terms of the GNU General Public License as published by
|
|
* the Free Software Foundation; version 2 of the License.
|
|
*
|
|
* This program is distributed in the hope that it will be useful,
|
|
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
* GNU General Public License for more details.
|
|
*
|
|
* You should have received a copy of the GNU General Public License
|
|
* along with this program; if not, write to the Free Software
|
|
* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
|
|
*/
|
|
#include <linux/kernel.h>
|
|
#include <linux/init.h>
|
|
#include <linux/smp.h>
|
|
#include <linux/spinlock.h>
|
|
#include <linux/io.h>
|
|
#include <linux/delay.h>
|
|
#include <mach/common.h>
|
|
#include <mach/emev2.h>
|
|
#include <asm/smp_plat.h>
|
|
#include <asm/smp_scu.h>
|
|
|
|
#define EMEV2_SCU_BASE 0x1e000000
|
|
#define EMEV2_SMU_BASE 0xe0110000
|
|
#define SMU_GENERAL_REG0 0x7c0
|
|
|
|
static int __cpuinit emev2_boot_secondary(unsigned int cpu, struct task_struct *idle)
|
|
{
|
|
arch_send_wakeup_ipi_mask(cpumask_of(cpu_logical_map(cpu)));
|
|
return 0;
|
|
}
|
|
|
|
static void __init emev2_smp_prepare_cpus(unsigned int max_cpus)
|
|
{
|
|
void __iomem *smu;
|
|
|
|
/* setup EMEV2 specific SCU base, enable */
|
|
shmobile_scu_base = ioremap(EMEV2_SCU_BASE, PAGE_SIZE);
|
|
scu_enable(shmobile_scu_base);
|
|
|
|
/* Tell ROM loader about our vector (in headsmp-scu.S, headsmp.S) */
|
|
smu = ioremap(EMEV2_SMU_BASE, PAGE_SIZE);
|
|
if (smu) {
|
|
iowrite32(__pa(shmobile_boot_vector), smu + SMU_GENERAL_REG0);
|
|
iounmap(smu);
|
|
}
|
|
shmobile_boot_fn = virt_to_phys(shmobile_boot_scu);
|
|
shmobile_boot_arg = (unsigned long)shmobile_scu_base;
|
|
|
|
/* enable cache coherency on booting CPU */
|
|
scu_power_mode(shmobile_scu_base, SCU_PM_NORMAL);
|
|
}
|
|
|
|
struct smp_operations emev2_smp_ops __initdata = {
|
|
.smp_prepare_cpus = emev2_smp_prepare_cpus,
|
|
.smp_boot_secondary = emev2_boot_secondary,
|
|
};
|