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