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/*
* File: arch/blackfin/mach-bf561/smp.c
* Author: Philippe Gerum <rpm@xenomai.org>
*
* Copyright 2007 Analog Devices Inc.
*
* 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; either version 2 of the License, or
* (at your option) any later version.
*
* 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, see the file COPYING, or write
* to the Free Software Foundation, Inc.,
* 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
*/
#include <linux/init.h>
#include <linux/kernel.h>
#include <linux/sched.h>
#include <linux/delay.h>
#include <asm/smp.h>
#include <asm/dma.h>
#define COREB_SRAM_BASE 0xff600000
#define COREB_SRAM_SIZE 0x4000
extern char coreb_trampoline_start, coreb_trampoline_end;
static DEFINE_SPINLOCK(boot_lock);
static cpumask_t cpu_callin_map;
/*
* platform_init_cpus() - Tell the world about how many cores we
* have. This is called while setting up the architecture support
* (setup_arch()), so don't be too demanding here with respect to
* available kernel services.
*/
void __init platform_init_cpus(void)
{
cpu_set(0, cpu_possible_map); /* CoreA */
cpu_set(1, cpu_possible_map); /* CoreB */
}
void __init platform_prepare_cpus(unsigned int max_cpus)
{
int len;
len = &coreb_trampoline_end - &coreb_trampoline_start + 1;
BUG_ON(len > COREB_SRAM_SIZE);
dma_memcpy((void *)COREB_SRAM_BASE, &coreb_trampoline_start, len);
/* Both cores ought to be present on a bf561! */
cpu_set(0, cpu_present_map); /* CoreA */
cpu_set(1, cpu_present_map); /* CoreB */
printk(KERN_INFO "CoreB bootstrap code to SRAM %p via DMA.\n", (void *)COREB_SRAM_BASE);
}
int __init setup_profiling_timer(unsigned int multiplier) /* not supported */
{
return -EINVAL;
}
void __cpuinit platform_secondary_init(unsigned int cpu)
{
local_irq_disable();
/* Clone setup for peripheral interrupt sources from CoreA. */
bfin_write_SICB_IMASK0(bfin_read_SICA_IMASK0());
bfin_write_SICB_IMASK1(bfin_read_SICA_IMASK1());
SSYNC();
/* Clone setup for IARs from CoreA. */
bfin_write_SICB_IAR0(bfin_read_SICA_IAR0());
bfin_write_SICB_IAR1(bfin_read_SICA_IAR1());
bfin_write_SICB_IAR2(bfin_read_SICA_IAR2());
bfin_write_SICB_IAR3(bfin_read_SICA_IAR3());
bfin_write_SICB_IAR4(bfin_read_SICA_IAR4());
bfin_write_SICB_IAR5(bfin_read_SICA_IAR5());
bfin_write_SICB_IAR6(bfin_read_SICA_IAR6());
bfin_write_SICB_IAR7(bfin_read_SICA_IAR7());
SSYNC();
local_irq_enable();
/* Calibrate loops per jiffy value. */
calibrate_delay();
/* Store CPU-private information to the cpu_data array. */
bfin_setup_cpudata(cpu);
/* We are done with local CPU inits, unblock the boot CPU. */
cpu_set(cpu, cpu_callin_map);
spin_lock(&boot_lock);
spin_unlock(&boot_lock);
}
int __cpuinit platform_boot_secondary(unsigned int cpu, struct task_struct *idle)
{
unsigned long timeout;
/* CoreB already running?! */
BUG_ON((bfin_read_SICA_SYSCR() & COREB_SRAM_INIT) == 0);
printk(KERN_INFO "Booting Core B.\n");
spin_lock(&boot_lock);
/* Kick CoreB, which should start execution from CORE_SRAM_BASE. */
SSYNC();
bfin_write_SICA_SYSCR(bfin_read_SICA_SYSCR() & ~COREB_SRAM_INIT);
SSYNC();
timeout = jiffies + 1 * HZ;
while (time_before(jiffies, timeout)) {
if (cpu_isset(cpu, cpu_callin_map))
break;
udelay(100);
barrier();
}
spin_unlock(&boot_lock);
return cpu_isset(cpu, cpu_callin_map) ? 0 : -ENOSYS;
}
void __init platform_request_ipi(irq_handler_t handler)
{
int ret;
ret = request_irq(IRQ_SUPPLE_0, handler, IRQF_DISABLED,
"SMP interrupt", handler);
if (ret)
panic("Cannot request supplemental interrupt 0 for IPI service\n");
}
void platform_send_ipi(cpumask_t callmap)
{
unsigned int cpu;
for_each_cpu_mask(cpu, callmap) {
BUG_ON(cpu >= 2);
SSYNC();
bfin_write_SICB_SYSCR(bfin_read_SICB_SYSCR() | (1 << (6 + cpu)));
SSYNC();
}
}
void platform_send_ipi_cpu(unsigned int cpu)
{
BUG_ON(cpu >= 2);
SSYNC();
bfin_write_SICB_SYSCR(bfin_read_SICB_SYSCR() | (1 << (6 + cpu)));
SSYNC();
}
void platform_clear_ipi(unsigned int cpu)
{
BUG_ON(cpu >= 2);
SSYNC();
bfin_write_SICB_SYSCR(bfin_read_SICB_SYSCR() | (1 << (10 + cpu)));
SSYNC();
}
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