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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
63 lines
1.4 KiB
C
63 lines
1.4 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* sh73a0 processor support
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*
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* Copyright (C) 2010 Takashi Yoshii
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* Copyright (C) 2010 Magnus Damm
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* Copyright (C) 2008 Yoshihiro Shimoda
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*/
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#include <linux/kernel.h>
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#include <linux/init.h>
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#include <linux/interrupt.h>
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#include <linux/irq.h>
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#include <linux/delay.h>
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#include <linux/input.h>
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#include <linux/io.h>
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#include <asm/hardware/cache-l2x0.h>
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#include <asm/mach/map.h>
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#include <asm/mach/arch.h>
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#include <asm/mach/time.h>
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#include "common.h"
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#include "sh73a0.h"
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static struct map_desc sh73a0_io_desc[] __initdata = {
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/* create a 1:1 identity mapping for 0xe6xxxxxx
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* used by CPGA, INTC and PFC.
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*/
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{
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.virtual = 0xe6000000,
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.pfn = __phys_to_pfn(0xe6000000),
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.length = 256 << 20,
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.type = MT_DEVICE_NONSHARED
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},
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};
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static void __init sh73a0_map_io(void)
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{
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debug_ll_io_init();
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iotable_init(sh73a0_io_desc, ARRAY_SIZE(sh73a0_io_desc));
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}
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static void __init sh73a0_generic_init(void)
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{
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#ifdef CONFIG_CACHE_L2X0
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/* Shared attribute override enable, 64K*8way */
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l2x0_init(IOMEM(0xf0100000), 0x00400000, 0xc20f0fff);
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#endif
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}
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static const char *const sh73a0_boards_compat_dt[] __initconst = {
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"renesas,sh73a0",
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NULL,
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};
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DT_MACHINE_START(SH73A0_DT, "Generic SH73A0 (Flattened Device Tree)")
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.smp = smp_ops(sh73a0_smp_ops),
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.map_io = sh73a0_map_io,
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.init_machine = sh73a0_generic_init,
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.init_late = shmobile_init_late,
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.dt_compat = sh73a0_boards_compat_dt,
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MACHINE_END
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