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/*
* This file contains common code that is intended to be used across
* boards so that it's not replicated.
*
* Copyright (C) 2011 Xilinx
*
* This software is licensed under the terms of the GNU General Public
* License version 2, as published by the Free Software Foundation, and
* may be copied, distributed, and modified under those terms.
*
* 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.
*/
#include <linux/init.h>
#include <linux/kernel.h>
#include <linux/cpumask.h>
#include <linux/platform_device.h>
#include <linux/clk.h>
#include <linux/clk-provider.h>
#include <linux/clk/zynq.h>
#include <linux/clocksource.h>
#include <linux/of_address.h>
#include <linux/of_irq.h>
#include <linux/of_platform.h>
#include <linux/of.h>
#include <linux/memblock.h>
#include <linux/irqchip.h>
#include <linux/irqchip/arm-gic.h>
#include <linux/slab.h>
#include <linux/sys_soc.h>
#include <asm/mach/arch.h>
#include <asm/mach/map.h>
#include <asm/mach/time.h>
#include <asm/mach-types.h>
#include <asm/page.h>
#include <asm/pgtable.h>
#include <asm/smp_scu.h>
#include <asm/system_info.h>
#include <asm/hardware/cache-l2x0.h>
#include "common.h"
#define ZYNQ_DEVCFG_MCTRL 0x80
#define ZYNQ_DEVCFG_PS_VERSION_SHIFT 28
#define ZYNQ_DEVCFG_PS_VERSION_MASK 0xF
void __iomem *zynq_scu_base;
/**
* zynq_memory_init - Initialize special memory
*
* We need to stop things allocating the low memory as DMA can't work in
* the 1st 512K of memory.
*/
static void __init zynq_memory_init(void)
{
if (!__pa(PAGE_OFFSET))
memblock_reserve(__pa(PAGE_OFFSET), __pa(swapper_pg_dir));
}
static struct platform_device zynq_cpuidle_device = {
.name = "cpuidle-zynq",
};
/**
* zynq_get_revision - Get Zynq silicon revision
*
* Return: Silicon version or -1 otherwise
*/
static int __init zynq_get_revision(void)
{
struct device_node *np;
void __iomem *zynq_devcfg_base;
u32 revision;
np = of_find_compatible_node(NULL, NULL, "xlnx,zynq-devcfg-1.0");
if (!np) {
pr_err("%s: no devcfg node found\n", __func__);
return -1;
}
zynq_devcfg_base = of_iomap(np, 0);
if (!zynq_devcfg_base) {
pr_err("%s: Unable to map I/O memory\n", __func__);
return -1;
}
revision = readl(zynq_devcfg_base + ZYNQ_DEVCFG_MCTRL);
revision >>= ZYNQ_DEVCFG_PS_VERSION_SHIFT;
revision &= ZYNQ_DEVCFG_PS_VERSION_MASK;
iounmap(zynq_devcfg_base);
return revision;
}
/**
* zynq_init_machine - System specific initialization, intended to be
* called from board specific initialization.
*/
static void __init zynq_init_machine(void)
{
struct platform_device_info devinfo = { .name = "cpufreq-dt", };
struct soc_device_attribute *soc_dev_attr;
struct soc_device *soc_dev;
struct device *parent = NULL;
soc_dev_attr = kzalloc(sizeof(*soc_dev_attr), GFP_KERNEL);
if (!soc_dev_attr)
goto out;
system_rev = zynq_get_revision();
soc_dev_attr->family = kasprintf(GFP_KERNEL, "Xilinx Zynq");
soc_dev_attr->revision = kasprintf(GFP_KERNEL, "0x%x", system_rev);
soc_dev_attr->soc_id = kasprintf(GFP_KERNEL, "0x%x",
zynq_slcr_get_device_id());
soc_dev = soc_device_register(soc_dev_attr);
if (IS_ERR(soc_dev)) {
kfree(soc_dev_attr->family);
kfree(soc_dev_attr->revision);
kfree(soc_dev_attr->soc_id);
kfree(soc_dev_attr);
goto out;
}
parent = soc_device_to_device(soc_dev);
out:
/*
* Finished with the static registrations now; fill in the missing
* devices
*/
of_platform_populate(NULL, of_default_bus_match_table, NULL, parent);
platform_device_register(&zynq_cpuidle_device);
platform_device_register_full(&devinfo);
zynq_slcr_init();
}
static void __init zynq_timer_init(void)
{
zynq_early_slcr_init();
zynq_clock_init();
of_clk_init(NULL);
clocksource_of_init();
}
static struct map_desc zynq_cortex_a9_scu_map __initdata = {
.length = SZ_256,
.type = MT_DEVICE,
};
static void __init zynq_scu_map_io(void)
{
unsigned long base;
base = scu_a9_get_base();
zynq_cortex_a9_scu_map.pfn = __phys_to_pfn(base);
/* Expected address is in vmalloc area that's why simple assign here */
zynq_cortex_a9_scu_map.virtual = base;
iotable_init(&zynq_cortex_a9_scu_map, 1);
zynq_scu_base = (void __iomem *)base;
BUG_ON(!zynq_scu_base);
}
/**
* zynq_map_io - Create memory mappings needed for early I/O.
*/
static void __init zynq_map_io(void)
{
debug_ll_io_init();
zynq_scu_map_io();
}
static void __init zynq_irq_init(void)
{
gic_arch_extn.flags = IRQCHIP_SKIP_SET_WAKE | IRQCHIP_MASK_ON_SUSPEND;
irqchip_init();
}
static void zynq_system_reset(enum reboot_mode mode, const char *cmd)
{
zynq_slcr_system_reset();
}
static const char * const zynq_dt_match[] = {
"xlnx,zynq-7000",
NULL
};
DT_MACHINE_START(XILINX_EP107, "Xilinx Zynq Platform")
/* 64KB way size, 8-way associativity, parity disabled */
.l2c_aux_val = 0x02000000,
.l2c_aux_mask = 0xf0ffffff,
.smp = smp_ops(zynq_smp_ops),
.map_io = zynq_map_io,
.init_irq = zynq_irq_init,
.init_machine = zynq_init_machine,
.init_time = zynq_timer_init,
.dt_compat = zynq_dt_match,
.reserve = zynq_memory_init,
.restart = zynq_system_reset,
MACHINE_END
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