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8701d8083d
Currently the SCU registers are mapped in SoC-specific code, using
different methods, all involving the static mapping set up from
machine_desc.map_io():
- On emev2, a static (non-identity) mapping is used, with ioremap().
As the static mapping uses the MT_DEVICE type, ioremap() reuses it,
and the returned virtual address is suitable for passing to
shmobile_smp_hook(),
- On sh73a0 and r8a7779, a static identity mapping is used, with the
legacy IOMEM() macro.
As the static mapping uses the MT_DEVICE_NONSHARED type, replacing
IOMEM() by ioremap() would create a new mapping, whose virtual
address cannot be passed to shmobile_smp_hook().
Move the mapping of the SCU registers from SoC-specific code to common
code, always using ioremap(). To work in the absence of a static
mapping, this requires passing the physical SCU base address to
shmobile_smp_hook().
Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>
Signed-off-by: Simon Horman <horms+renesas@verge.net.au>
55 lines
1.6 KiB
C
55 lines
1.6 KiB
C
/*
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* SMP support for Emma Mobile EV2
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*
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* Copyright (C) 2012 Renesas Solutions Corp.
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* Copyright (C) 2012 Magnus Damm
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; version 2 of the License.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*/
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#include <linux/kernel.h>
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#include <linux/init.h>
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#include <linux/smp.h>
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#include <linux/spinlock.h>
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#include <linux/io.h>
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#include <linux/delay.h>
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#include <asm/smp_plat.h>
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#include <asm/smp_scu.h>
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#include "common.h"
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#define EMEV2_SCU_BASE 0x1e000000
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#define EMEV2_SMU_BASE 0xe0110000
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#define SMU_GENERAL_REG0 0x7c0
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static int emev2_boot_secondary(unsigned int cpu, struct task_struct *idle)
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{
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arch_send_wakeup_ipi_mask(cpumask_of(cpu_logical_map(cpu)));
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return 0;
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}
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static void __init emev2_smp_prepare_cpus(unsigned int max_cpus)
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{
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void __iomem *smu;
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/* Tell ROM loader about our vector (in headsmp.S) */
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smu = ioremap(EMEV2_SMU_BASE, PAGE_SIZE);
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if (smu) {
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iowrite32(__pa(shmobile_boot_vector), smu + SMU_GENERAL_REG0);
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iounmap(smu);
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}
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/* setup EMEV2 specific SCU bits */
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shmobile_smp_scu_prepare_cpus(EMEV2_SCU_BASE, max_cpus);
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}
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const struct smp_operations emev2_smp_ops __initconst = {
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.smp_prepare_cpus = emev2_smp_prepare_cpus,
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.smp_boot_secondary = emev2_boot_secondary,
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};
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