mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
synced 2024-10-02 23:27:06 +00:00
408324a3c5
SH-Mobile AG5 and R-Car H1 SoCs are based on the Cortex-A9 MPCore, which
includes a global timer.
Enable the ARM global timer on these SoCs, which will be used for:
- the scheduler clock, improving scheduler accuracy from 10 ms to 3 or
4 ns,
- delay loops, allowing removal of calls to shmobile_init_delay() from
the corresponding machine vectors.
Note that when using an old DTB lacking the global timer, the kernel
will still work. However, loops-per-jiffies will no longer be preset,
and the delay loop will need to be calibrated during boot.
Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>
Link: https://lore.kernel.org/r/20191211135222.26770-5-geert+renesas@glider.be
62 lines
1.4 KiB
C
62 lines
1.4 KiB
C
// SPDX-License-Identifier: GPL-2.0
|
|
/*
|
|
* sh73a0 processor support
|
|
*
|
|
* Copyright (C) 2010 Takashi Yoshii
|
|
* Copyright (C) 2010 Magnus Damm
|
|
* Copyright (C) 2008 Yoshihiro Shimoda
|
|
*/
|
|
#include <linux/kernel.h>
|
|
#include <linux/init.h>
|
|
#include <linux/interrupt.h>
|
|
#include <linux/irq.h>
|
|
#include <linux/delay.h>
|
|
#include <linux/input.h>
|
|
#include <linux/io.h>
|
|
|
|
#include <asm/hardware/cache-l2x0.h>
|
|
#include <asm/mach/map.h>
|
|
#include <asm/mach/arch.h>
|
|
#include <asm/mach/time.h>
|
|
|
|
#include "common.h"
|
|
#include "sh73a0.h"
|
|
|
|
static struct map_desc sh73a0_io_desc[] __initdata = {
|
|
/* create a 1:1 identity mapping for 0xe6xxxxxx
|
|
* used by CPGA, INTC and PFC.
|
|
*/
|
|
{
|
|
.virtual = 0xe6000000,
|
|
.pfn = __phys_to_pfn(0xe6000000),
|
|
.length = 256 << 20,
|
|
.type = MT_DEVICE_NONSHARED
|
|
},
|
|
};
|
|
|
|
static void __init sh73a0_map_io(void)
|
|
{
|
|
debug_ll_io_init();
|
|
iotable_init(sh73a0_io_desc, ARRAY_SIZE(sh73a0_io_desc));
|
|
}
|
|
|
|
static void __init sh73a0_generic_init(void)
|
|
{
|
|
#ifdef CONFIG_CACHE_L2X0
|
|
/* Shared attribute override enable, 64K*8way */
|
|
l2x0_init(IOMEM(0xf0100000), 0x00400000, 0xc20f0fff);
|
|
#endif
|
|
}
|
|
|
|
static const char *const sh73a0_boards_compat_dt[] __initconst = {
|
|
"renesas,sh73a0",
|
|
NULL,
|
|
};
|
|
|
|
DT_MACHINE_START(SH73A0_DT, "Generic SH73A0 (Flattened Device Tree)")
|
|
.smp = smp_ops(sh73a0_smp_ops),
|
|
.map_io = sh73a0_map_io,
|
|
.init_machine = sh73a0_generic_init,
|
|
.init_late = shmobile_init_late,
|
|
.dt_compat = sh73a0_boards_compat_dt,
|
|
MACHINE_END
|