highbank.c
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/*
* Copyright 2010-2011 Calxeda, Inc.
*
* This program is free software; you can redistribute it and/or modify it
* under the terms and conditions of the GNU General Public License,
* version 2, as published by the Free Software Foundation.
*
* This program is distributed in the hope 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 <http://www.gnu.org/licenses/>.
*/
#include <linux/clk.h>
#include <linux/clkdev.h>
#include <linux/io.h>
#include <linux/irq.h>
#include <linux/irqdomain.h>
#include <linux/of.h>
#include <linux/of_irq.h>
#include <linux/of_platform.h>
#include <linux/of_address.h>
#include <linux/smp.h>
#include <asm/cacheflush.h>
#include <asm/unified.h>
#include <asm/smp_scu.h>
#include <asm/hardware/arm_timer.h>
#include <asm/hardware/timer-sp.h>
#include <asm/hardware/gic.h>
#include <asm/hardware/cache-l2x0.h>
#include <asm/mach/arch.h>
#include <asm/mach/map.h>
#include <asm/mach/time.h>
#include <mach/irqs.h>
#include "core.h"
#include "sysregs.h"
void __iomem *sregs_base;
#define HB_SCU_VIRT_BASE 0xfee00000
void __iomem *scu_base_addr = ((void __iomem *)(HB_SCU_VIRT_BASE));
static struct map_desc scu_io_desc __initdata = {
.virtual = HB_SCU_VIRT_BASE,
.pfn = 0, /* run-time */
.length = SZ_4K,
.type = MT_DEVICE,
};
static void __init highbank_scu_map_io(void)
{
unsigned long base;
/* Get SCU base */
asm("mrc p15, 4, %0, c15, c0, 0" : "=r" (base));
scu_io_desc.pfn = __phys_to_pfn(base);
iotable_init(&scu_io_desc, 1);
}
static void __init highbank_map_io(void)
{
highbank_scu_map_io();
highbank_lluart_map_io();
}
#define HB_JUMP_TABLE_PHYS(cpu) (0x40 + (0x10 * (cpu)))
#define HB_JUMP_TABLE_VIRT(cpu) phys_to_virt(HB_JUMP_TABLE_PHYS(cpu))
void highbank_set_cpu_jump(int cpu, void *jump_addr)
{
#ifdef CONFIG_SMP
cpu = cpu_logical_map(cpu);
#endif
writel(BSYM(virt_to_phys(jump_addr)), HB_JUMP_TABLE_VIRT(cpu));
__cpuc_flush_dcache_area(HB_JUMP_TABLE_VIRT(cpu), 16);
outer_clean_range(HB_JUMP_TABLE_PHYS(cpu),
HB_JUMP_TABLE_PHYS(cpu) + 15);
}
const static struct of_device_id irq_match[] = {
{ .compatible = "arm,cortex-a9-gic", .data = gic_of_init, },
{}
};
static void __init highbank_init_irq(void)
{
of_irq_init(irq_match);
l2x0_of_init(0, ~0UL);
}
static void __init highbank_timer_init(void)
{
int irq;
struct device_node *np;
void __iomem *timer_base;
/* Map system registers */
np = of_find_compatible_node(NULL, NULL, "calxeda,hb-sregs");
sregs_base = of_iomap(np, 0);
WARN_ON(!sregs_base);
np = of_find_compatible_node(NULL, NULL, "arm,sp804");
timer_base = of_iomap(np, 0);
WARN_ON(!timer_base);
irq = irq_of_parse_and_map(np, 0);
highbank_clocks_init();
sp804_clocksource_init(timer_base + 0x20, "timer1");
sp804_clockevents_init(timer_base, irq, "timer0");
}
static struct sys_timer highbank_timer = {
.init = highbank_timer_init,
};
static void highbank_power_off(void)
{
hignbank_set_pwr_shutdown();
scu_power_mode(scu_base_addr, SCU_PM_POWEROFF);
while (1)
cpu_do_idle();
}
static void __init highbank_init(void)
{
pm_power_off = highbank_power_off;
of_platform_populate(NULL, of_default_bus_match_table, NULL, NULL);
}
static const char *highbank_match[] __initconst = {
"calxeda,highbank",
NULL,
};
DT_MACHINE_START(HIGHBANK, "Highbank")
.map_io = highbank_map_io,
.init_irq = highbank_init_irq,
.timer = &highbank_timer,
.handle_irq = gic_handle_irq,
.init_machine = highbank_init,
.dt_compat = highbank_match,
.restart = highbank_restart,
MACHINE_END