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/*
* Versatile board support using the device tree
*
* Copyright (C) 2010 Secret Lab Technologies Ltd.
* Copyright (C) 2009 Jeremy Kerr <jeremy.kerr@canonical.com>
* Copyright (C) 2004 ARM Limited
* Copyright (C) 2000 Deep Blue Solutions Ltd
*
* 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, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
#include <linux/init.h>
#include <linux/io.h>
#include <linux/of.h>
#include <linux/of_address.h>
#include <linux/of_irq.h>
#include <linux/of_platform.h>
#include <linux/slab.h>
#include <asm/mach-types.h>
#include <asm/mach/arch.h>
#include "core.h"
#define VERSATILE_SYS_PCICTL_OFFSET 0x44
static void __iomem *versatile_sys_base;
static void __init versatile_dt_pci_init(void)
{
u32 val;
struct device_node *np;
struct property *newprop;
np = of_find_compatible_node(NULL, NULL, "arm,versatile-pci");
if (!np)
return;
/* Check if PCI backplane is detected */
val = readl(versatile_sys_base + VERSATILE_SYS_PCICTL_OFFSET);
if (val & 1) {
/*
* Enable PCI accesses. Note that the documentaton is
* inconsistent whether or not this is needed, but the old
* driver had it so we will keep it.
*/
writel(1, versatile_sys_base + VERSATILE_SYS_PCICTL_OFFSET);
return;
}
newprop = kzalloc(sizeof(*newprop), GFP_KERNEL);
if (!newprop)
return;
newprop->name = kstrdup("status", GFP_KERNEL);
newprop->value = kstrdup("disabled", GFP_KERNEL);
newprop->length = sizeof("disabled");
of_update_property(np, newprop);
pr_info("Not plugged into PCI backplane!\n");
}
static void __init versatile_dt_init(void)
{
struct device_node *np;
np = of_find_compatible_node(NULL, NULL, "arm,core-module-versatile");
if (np)
versatile_sys_base = of_iomap(np, 0);
WARN_ON(!versatile_sys_base);
versatile_dt_pci_init();
of_platform_populate(NULL, of_default_bus_match_table,
versatile_auxdata_lookup, NULL);
}
static const char *const versatile_dt_match[] __initconst = {
"arm,versatile-ab",
"arm,versatile-pb",
NULL,
};
DT_MACHINE_START(VERSATILE_PB, "ARM-Versatile (Device Tree Support)")
.map_io = versatile_map_io,
.init_early = versatile_init_early,
.init_machine = versatile_dt_init,
.dt_compat = versatile_dt_match,
.restart = versatile_restart,
MACHINE_END
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