1 /* 2 * Author: Alexander Shiyan <shc_work@mail.ru>, 2016 3 * 4 * This program is free software; you can redistribute it and/or modify 5 * it under the terms of the GNU General Public License as published by 6 * the Free Software Foundation; either version 2 of the License, or 7 * (at your option) any later version. 8 */ 9 10 #include <linux/io.h> 11 #include <linux/of_fdt.h> 12 #include <linux/platform_device.h> 13 #include <linux/random.h> 14 #include <linux/sizes.h> 15 16 #include <linux/mfd/syscon/clps711x.h> 17 18 #include <asm/system_info.h> 19 #include <asm/system_misc.h> 20 #include <asm/mach/arch.h> 21 #include <asm/mach/map.h> 22 23 #define CLPS711X_VIRT_BASE IOMEM(0xfeff4000) 24 #define CLPS711X_PHYS_BASE (0x80000000) 25 # define SYSFLG1 (0x0140) 26 # define HALT (0x0800) 27 # define UNIQID (0x2440) 28 # define RANDID0 (0x2700) 29 # define RANDID1 (0x2704) 30 # define RANDID2 (0x2708) 31 # define RANDID3 (0x270c) 32 33 static struct map_desc clps711x_io_desc __initdata = { 34 .virtual = (unsigned long)CLPS711X_VIRT_BASE, 35 .pfn = __phys_to_pfn(CLPS711X_PHYS_BASE), 36 .length = 48 * SZ_1K, 37 .type = MT_DEVICE, 38 }; 39 40 static void __init clps711x_map_io(void) 41 { 42 iotable_init(&clps711x_io_desc, 1); 43 } 44 45 static const struct resource clps711x_cpuidle_res = 46 DEFINE_RES_MEM(CLPS711X_PHYS_BASE + HALT, SZ_128); 47 48 static void __init clps711x_init(void) 49 { 50 u32 id[5]; 51 52 id[0] = readl(CLPS711X_VIRT_BASE + UNIQID); 53 id[1] = readl(CLPS711X_VIRT_BASE + RANDID0); 54 id[2] = readl(CLPS711X_VIRT_BASE + RANDID1); 55 id[3] = readl(CLPS711X_VIRT_BASE + RANDID2); 56 id[4] = readl(CLPS711X_VIRT_BASE + RANDID3); 57 system_rev = SYSFLG1_VERID(readl(CLPS711X_VIRT_BASE + SYSFLG1)); 58 59 add_device_randomness(id, sizeof(id)); 60 61 system_serial_low = id[0]; 62 63 platform_device_register_simple("clps711x-cpuidle", PLATFORM_DEVID_NONE, 64 &clps711x_cpuidle_res, 1); 65 } 66 67 static void clps711x_restart(enum reboot_mode mode, const char *cmd) 68 { 69 soft_restart(0); 70 } 71 72 static const char *const clps711x_compat[] __initconst = { 73 "cirrus,ep7209", 74 NULL 75 }; 76 77 DT_MACHINE_START(CLPS711X_DT, "Cirrus Logic CLPS711X (Device Tree Support)") 78 .dt_compat = clps711x_compat, 79 .map_io = clps711x_map_io, 80 .init_late = clps711x_init, 81 .restart = clps711x_restart, 82 MACHINE_END 83