1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /*
3  *  Author: Alexander Shiyan <shc_work@mail.ru>, 2016
4  */
5 
6 #include <linux/io.h>
7 #include <linux/of_fdt.h>
8 #include <linux/platform_device.h>
9 #include <linux/random.h>
10 #include <linux/sizes.h>
11 
12 #include <linux/mfd/syscon/clps711x.h>
13 
14 #include <asm/system_info.h>
15 #include <asm/system_misc.h>
16 #include <asm/mach/arch.h>
17 #include <asm/mach/map.h>
18 
19 #define CLPS711X_VIRT_BASE	IOMEM(0xfeff4000)
20 #define CLPS711X_PHYS_BASE	(0x80000000)
21 # define SYSFLG1		(0x0140)
22 # define HALT			(0x0800)
23 # define UNIQID			(0x2440)
24 # define RANDID0		(0x2700)
25 # define RANDID1		(0x2704)
26 # define RANDID2		(0x2708)
27 # define RANDID3		(0x270c)
28 
29 static struct map_desc clps711x_io_desc __initdata = {
30 	.virtual	= (unsigned long)CLPS711X_VIRT_BASE,
31 	.pfn		= __phys_to_pfn(CLPS711X_PHYS_BASE),
32 	.length		= 48 * SZ_1K,
33 	.type		= MT_DEVICE,
34 };
35 
36 static void __init clps711x_map_io(void)
37 {
38 	iotable_init(&clps711x_io_desc, 1);
39 }
40 
41 static const struct resource clps711x_cpuidle_res =
42 	DEFINE_RES_MEM(CLPS711X_PHYS_BASE + HALT, SZ_128);
43 
44 static void __init clps711x_init(void)
45 {
46 	u32 id[5];
47 
48 	id[0] = readl(CLPS711X_VIRT_BASE + UNIQID);
49 	id[1] = readl(CLPS711X_VIRT_BASE + RANDID0);
50 	id[2] = readl(CLPS711X_VIRT_BASE + RANDID1);
51 	id[3] = readl(CLPS711X_VIRT_BASE + RANDID2);
52 	id[4] = readl(CLPS711X_VIRT_BASE + RANDID3);
53 	system_rev = SYSFLG1_VERID(readl(CLPS711X_VIRT_BASE + SYSFLG1));
54 
55 	add_device_randomness(id, sizeof(id));
56 
57 	system_serial_low = id[0];
58 
59 	platform_device_register_simple("clps711x-cpuidle", PLATFORM_DEVID_NONE,
60 					&clps711x_cpuidle_res, 1);
61 }
62 
63 static void clps711x_restart(enum reboot_mode mode, const char *cmd)
64 {
65 	soft_restart(0);
66 }
67 
68 static const char *const clps711x_compat[] __initconst = {
69 	"cirrus,ep7209",
70 	NULL
71 };
72 
73 DT_MACHINE_START(CLPS711X_DT, "Cirrus Logic CLPS711X (Device Tree Support)")
74 	.dt_compat	= clps711x_compat,
75 	.map_io		= clps711x_map_io,
76 	.init_late	= clps711x_init,
77 	.restart	= clps711x_restart,
78 MACHINE_END
79