b6d5e47e67
Probe the CPU interrupt controller & optional Global Interrupt Controller (GIC) using devicetree rather than platform code. Because the bootloader on SEAD3 does not provide a device tree to the kernel & the device tree is always built in, we patch out the GIC node during boot if we detect that a GIC is not present in the system. The appropriate IRQ domain is discovered by platform code setting up device IRQ numbers temporarily. It will be removed by further patches which move the devices towards being probed via device tree. No behavioural change is intended by this patch. Signed-off-by: Paul Burton <paul.burton@imgtec.com> Cc: Matt Redfearn <matt.redfearn@imgtec.com> Cc: Kefeng Wang <wangkefeng.wang@huawei.com> Cc: Jacek Anaszewski <j.anaszewski@samsung.com> Cc: Rob Herring <robh+dt@kernel.org> Cc: Mark Rutland <mark.rutland@arm.com> Cc: linux-mips@linux-mips.org Cc: devicetree@vger.kernel.org Cc: linux-kernel@vger.kernel.org Patchwork: https://patchwork.linux-mips.org/patch/14047/ Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
106 lines
2.0 KiB
C
106 lines
2.0 KiB
C
/*
|
|
* This file is subject to the terms and conditions of the GNU General Public
|
|
* License. See the file "COPYING" in the main directory of this archive
|
|
* for more details.
|
|
*
|
|
* Copyright (C) 2012 MIPS Technologies, Inc. All rights reserved.
|
|
* Copyright (C) 2013 Imagination Technologies Ltd.
|
|
*/
|
|
#include <linux/init.h>
|
|
#include <linux/libfdt.h>
|
|
#include <linux/of_fdt.h>
|
|
|
|
#include <asm/prom.h>
|
|
#include <asm/fw/fw.h>
|
|
|
|
#include <asm/mach-sead3/sead3-dtshim.h>
|
|
#include <asm/mips-boards/generic.h>
|
|
|
|
const char *get_system_type(void)
|
|
{
|
|
return "MIPS SEAD3";
|
|
}
|
|
|
|
static uint32_t get_memsize_from_cmdline(void)
|
|
{
|
|
int memsize = 0;
|
|
char *p = arcs_cmdline;
|
|
char *s = "memsize=";
|
|
|
|
p = strstr(p, s);
|
|
if (p) {
|
|
p += strlen(s);
|
|
memsize = memparse(p, NULL);
|
|
}
|
|
|
|
return memsize;
|
|
}
|
|
|
|
static uint32_t get_memsize_from_env(void)
|
|
{
|
|
int memsize = 0;
|
|
char *p;
|
|
|
|
p = fw_getenv("memsize");
|
|
if (p)
|
|
memsize = memparse(p, NULL);
|
|
|
|
return memsize;
|
|
}
|
|
|
|
static uint32_t get_memsize(void)
|
|
{
|
|
uint32_t memsize;
|
|
|
|
memsize = get_memsize_from_cmdline();
|
|
if (memsize)
|
|
return memsize;
|
|
|
|
return get_memsize_from_env();
|
|
}
|
|
|
|
static void __init parse_memsize_param(void)
|
|
{
|
|
int offset;
|
|
const uint64_t *prop_value;
|
|
int prop_len;
|
|
uint32_t memsize = get_memsize();
|
|
|
|
if (!memsize)
|
|
return;
|
|
|
|
offset = fdt_path_offset(__dtb_start, "/memory");
|
|
if (offset > 0) {
|
|
uint64_t new_value;
|
|
/*
|
|
* reg contains 2 32-bits BE values, offset and size. We just
|
|
* want to replace the size value without affecting the offset
|
|
*/
|
|
prop_value = fdt_getprop(__dtb_start, offset, "reg", &prop_len);
|
|
new_value = be64_to_cpu(*prop_value);
|
|
new_value = (new_value & ~0xffffffffllu) | memsize;
|
|
fdt_setprop_inplace_u64(__dtb_start, offset, "reg", new_value);
|
|
}
|
|
}
|
|
|
|
void __init *plat_get_fdt(void)
|
|
{
|
|
return (void *)__dtb_start;
|
|
}
|
|
|
|
void __init plat_mem_setup(void)
|
|
{
|
|
void *fdt = plat_get_fdt();
|
|
|
|
/* allow command line/bootloader env to override memory size in DT */
|
|
parse_memsize_param();
|
|
|
|
fdt = sead3_dt_shim(fdt);
|
|
__dt_setup_arch(fdt);
|
|
}
|
|
|
|
void __init device_tree_init(void)
|
|
{
|
|
unflatten_and_copy_device_tree();
|
|
}
|