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0db943ec02
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>
83 lines
2.1 KiB
C
83 lines
2.1 KiB
C
/*
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* Author: Alexander Shiyan <shc_work@mail.ru>, 2016
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*/
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#include <linux/io.h>
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#include <linux/of_fdt.h>
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#include <linux/platform_device.h>
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#include <linux/random.h>
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#include <linux/sizes.h>
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#include <linux/mfd/syscon/clps711x.h>
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#include <asm/system_info.h>
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#include <asm/system_misc.h>
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#include <asm/mach/arch.h>
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#include <asm/mach/map.h>
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#define CLPS711X_VIRT_BASE IOMEM(0xfeff4000)
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#define CLPS711X_PHYS_BASE (0x80000000)
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# define SYSFLG1 (0x0140)
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# define HALT (0x0800)
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# define UNIQID (0x2440)
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# define RANDID0 (0x2700)
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# define RANDID1 (0x2704)
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# define RANDID2 (0x2708)
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# define RANDID3 (0x270c)
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static struct map_desc clps711x_io_desc __initdata = {
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.virtual = (unsigned long)CLPS711X_VIRT_BASE,
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.pfn = __phys_to_pfn(CLPS711X_PHYS_BASE),
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.length = 48 * SZ_1K,
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.type = MT_DEVICE,
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};
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static void __init clps711x_map_io(void)
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{
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iotable_init(&clps711x_io_desc, 1);
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}
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static const struct resource clps711x_cpuidle_res =
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DEFINE_RES_MEM(CLPS711X_PHYS_BASE + HALT, SZ_128);
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static void __init clps711x_init(void)
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{
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u32 id[5];
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id[0] = readl(CLPS711X_VIRT_BASE + UNIQID);
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id[1] = readl(CLPS711X_VIRT_BASE + RANDID0);
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id[2] = readl(CLPS711X_VIRT_BASE + RANDID1);
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id[3] = readl(CLPS711X_VIRT_BASE + RANDID2);
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id[4] = readl(CLPS711X_VIRT_BASE + RANDID3);
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system_rev = SYSFLG1_VERID(readl(CLPS711X_VIRT_BASE + SYSFLG1));
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add_device_randomness(id, sizeof(id));
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system_serial_low = id[0];
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platform_device_register_simple("clps711x-cpuidle", PLATFORM_DEVID_NONE,
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&clps711x_cpuidle_res, 1);
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}
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static void clps711x_restart(enum reboot_mode mode, const char *cmd)
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{
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soft_restart(0);
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}
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static const char *clps711x_compat[] __initconst = {
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"cirrus,ep7209",
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NULL
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};
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DT_MACHINE_START(CLPS711X_DT, "Cirrus Logic CLPS711X (Device Tree Support)")
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.dt_compat = clps711x_compat,
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.map_io = clps711x_map_io,
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.init_late = clps711x_init,
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.restart = clps711x_restart,
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MACHINE_END
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