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
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