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ARM: clps711x: Add basic DT support

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This patch adds basic support to run Cirrus Logic ARMv4T CPUs
with device-tree support.

Signed-off-by: Alexander Shiyan <shc_work@mail.ru>
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
This commit is contained in:
Alexander Shiyan 2016-06-04 10:10:03 +03:00 committed by Arnd Bergmann
parent 32981ea5b9
commit 0db943ec02
3 changed files with 92 additions and 0 deletions
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9
arch/arm/mach-clps711x/Kconfig
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@ -2,6 +2,15 @@ if ARCH_CLPS711X
menu "CLPS711X/EP721X/EP731X Implementations"
config MACH_CLPS711X_DT
bool "Device-tree support"
select CLKSRC_OF
select OF_IRQ
select USE_OF
help
Select this if you want to experiment device-tree with
ARMv4T Cirrus Logic chips.
config ARCH_AUTCPU12
bool "AUTCPU12"
help

1
arch/arm/mach-clps711x/Makefile
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@ -6,6 +6,7 @@
obj-y := common.o devices.o
obj-$(CONFIG_MACH_CLPS711X_DT) += board-dt.o
obj-$(CONFIG_ARCH_AUTCPU12) += board-autcpu12.o
obj-$(CONFIG_ARCH_CDB89712) += board-cdb89712.o
obj-$(CONFIG_ARCH_CLEP7312) += board-clep7312.o

82
arch/arm/mach-clps711x/board-dt.c Normal file
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@ -0,0 +1,82 @@
/*
* Author: Alexander Shiyan <shc_work@mail.ru>, 2016
*
* 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.
*/
#include <linux/io.h>
#include <linux/of_fdt.h>
#include <linux/platform_device.h>
#include <linux/random.h>
#include <linux/sizes.h>
#include <linux/mfd/syscon/clps711x.h>
#include <asm/system_info.h>
#include <asm/system_misc.h>
#include <asm/mach/arch.h>
#include <asm/mach/map.h>
#define CLPS711X_VIRT_BASE IOMEM(0xfeff4000)
#define CLPS711X_PHYS_BASE (0x80000000)
# define SYSFLG1 (0x0140)
# define HALT (0x0800)
# define UNIQID (0x2440)
# define RANDID0 (0x2700)
# define RANDID1 (0x2704)
# define RANDID2 (0x2708)
# define RANDID3 (0x270c)
static struct map_desc clps711x_io_desc __initdata = {
.virtual = (unsigned long)CLPS711X_VIRT_BASE,
.pfn = __phys_to_pfn(CLPS711X_PHYS_BASE),
.length = 48 * SZ_1K,
.type = MT_DEVICE,
};
static void __init clps711x_map_io(void)
{
iotable_init(&clps711x_io_desc, 1);
}
static const struct resource clps711x_cpuidle_res =
DEFINE_RES_MEM(CLPS711X_PHYS_BASE + HALT, SZ_128);
static void __init clps711x_init(void)
{
u32 id[5];
id[0] = readl(CLPS711X_VIRT_BASE + UNIQID);
id[1] = readl(CLPS711X_VIRT_BASE + RANDID0);
id[2] = readl(CLPS711X_VIRT_BASE + RANDID1);
id[3] = readl(CLPS711X_VIRT_BASE + RANDID2);
id[4] = readl(CLPS711X_VIRT_BASE + RANDID3);
system_rev = SYSFLG1_VERID(readl(CLPS711X_VIRT_BASE + SYSFLG1));
add_device_randomness(id, sizeof(id));
system_serial_low = id[0];
platform_device_register_simple("clps711x-cpuidle", PLATFORM_DEVID_NONE,
&clps711x_cpuidle_res, 1);
}
static void clps711x_restart(enum reboot_mode mode, const char *cmd)
{
soft_restart(0);
}
static const char *clps711x_compat[] __initconst = {
"cirrus,ep7209",
NULL
};
DT_MACHINE_START(CLPS711X_DT, "Cirrus Logic CLPS711X (Device Tree Support)")
.dt_compat = clps711x_compat,
.map_io = clps711x_map_io,
.init_late = clps711x_init,
.restart = clps711x_restart,
MACHINE_END