common.c

Go to the documentation of this file.

/*
 * 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/of_irq.h>
#include <linux/of_platform.h>
#include <linux/of.h>

#include <asm/mach/arch.h>
#include <asm/mach/map.h>
#include <asm/mach-types.h>
#include <asm/page.h>
#include <asm/hardware/gic.h>
#include <asm/hardware/cache-l2x0.h>

#include <mach/zynq_soc.h>
#include <mach/clkdev.h>
#include "common.h"

static struct of_device_id zynq_of_bus_ids[] __initdata = {
    { .compatible = "simple-bus", },
    {}
};

static void __init xilinx_init_machine(void)
{
#ifdef CONFIG_CACHE_L2X0
    /*
     * 64KB way size, 8-way associativity, parity disabled
     */
    l2x0_init(PL310_L2CC_BASE, 0x02060000, 0xF0F0FFFF);
#endif

    of_platform_bus_probe(NULL, zynq_of_bus_ids, NULL);
}

static void __init xilinx_irq_init(void)
{
    gic_init(0, 29, SCU_GIC_DIST_BASE, SCU_GIC_CPU_BASE);
}

/* The minimum devices needed to be mapped before the VM system is up and
 * running include the GIC, UART and Timer Counter.
 */

static struct map_desc io_desc[] __initdata = {
    {
        .virtual    = TTC0_VIRT,
        .pfn        = __phys_to_pfn(TTC0_PHYS),
        .length     = SZ_4K,
        .type       = MT_DEVICE,
    }, {
        .virtual    = SCU_PERIPH_VIRT,
        .pfn        = __phys_to_pfn(SCU_PERIPH_PHYS),
        .length     = SZ_8K,
        .type       = MT_DEVICE,
    }, {
        .virtual    = PL310_L2CC_VIRT,
        .pfn        = __phys_to_pfn(PL310_L2CC_PHYS),
        .length     = SZ_4K,
        .type       = MT_DEVICE,
    },

#ifdef CONFIG_DEBUG_LL
    {
        .virtual    = UART0_VIRT,
        .pfn        = __phys_to_pfn(UART0_PHYS),
        .length     = SZ_4K,
        .type       = MT_DEVICE,
    },
#endif

};

static void __init xilinx_map_io(void)
{
    iotable_init(io_desc, ARRAY_SIZE(io_desc));
}

static const char *xilinx_dt_match[] = {
    "xlnx,zynq-ep107",
    NULL
};

MACHINE_START(XILINX_EP107, "Xilinx Zynq Platform")
    .map_io     = xilinx_map_io,
    .init_irq   = xilinx_irq_init,
    .handle_irq = gic_handle_irq,
    .init_machine   = xilinx_init_machine,
    .timer      = &xttcpss_sys_timer,
    .dt_compat  = xilinx_dt_match,
MACHINE_END