1 /* 2 * nRF51 Random Number Generator 3 * 4 * QEMU interface: 5 * + Property "period_unfiltered_us": Time between two biased values in 6 * microseconds. 7 * + Property "period_filtered_us": Time between two unbiased values in 8 * microseconds. 9 * + sysbus MMIO regions 0: Memory Region with tasks, events and registers 10 * to be mapped to the peripherals instance address by the SOC. 11 * + Named GPIO output "irq": Interrupt line of the peripheral. Must be 12 * connected to the associated peripheral interrupt line of the NVIC. 13 * + Named GPIO output "eep_valrdy": Event set when new random value is ready 14 * to be read. 15 * + Named GPIO input "tep_start": Task that triggers start of continuous 16 * generation of random values. 17 * + Named GPIO input "tep_stop": Task that ends continuous generation of 18 * random values. 19 * 20 * Accuracy of the peripheral model: 21 * + Stochastic properties of different configurations of the random source 22 * are not modeled. 23 * + Generation of unfiltered and filtered random values take at least the 24 * average generation time stated in the production specification; 25 * non-deterministic generation times are not modeled. 26 * 27 * Copyright 2018 Steffen Görtz <contrib@steffen-goertz.de> 28 * 29 * This code is licensed under the GPL version 2 or later. See 30 * the COPYING file in the top-level directory. 31 * 32 */ 33 34 #ifndef NRF51_RNG_H 35 #define NRF51_RNG_H 36 37 #include "hw/sysbus.h" 38 #include "qemu/timer.h" 39 #include "qom/object.h" 40 #define TYPE_NRF51_RNG "nrf51_soc.rng" 41 typedef struct NRF51RNGState NRF51RNGState; 42 DECLARE_INSTANCE_CHECKER(NRF51RNGState, NRF51_RNG, 43 TYPE_NRF51_RNG) 44 45 #define NRF51_RNG_SIZE 0x1000 46 47 #define NRF51_RNG_TASK_START 0x000 48 #define NRF51_RNG_TASK_STOP 0x004 49 #define NRF51_RNG_EVENT_VALRDY 0x100 50 #define NRF51_RNG_REG_SHORTS 0x200 51 #define NRF51_RNG_REG_SHORTS_VALRDY_STOP 0 52 #define NRF51_RNG_REG_INTEN 0x300 53 #define NRF51_RNG_REG_INTEN_VALRDY 0 54 #define NRF51_RNG_REG_INTENSET 0x304 55 #define NRF51_RNG_REG_INTENCLR 0x308 56 #define NRF51_RNG_REG_CONFIG 0x504 57 #define NRF51_RNG_REG_CONFIG_DECEN 0 58 #define NRF51_RNG_REG_VALUE 0x508 59 60 struct NRF51RNGState { 61 SysBusDevice parent_obj; 62 63 MemoryRegion mmio; 64 qemu_irq irq; 65 66 /* Event End Points */ 67 qemu_irq eep_valrdy; 68 69 QEMUTimer timer; 70 71 /* Time between generation of successive unfiltered values in us */ 72 uint16_t period_unfiltered_us; 73 /* Time between generation of successive filtered values in us */ 74 uint16_t period_filtered_us; 75 76 uint8_t value; 77 78 uint32_t active; 79 uint32_t event_valrdy; 80 uint32_t shortcut_stop_on_valrdy; 81 uint32_t interrupt_enabled; 82 uint32_t filter_enabled; 83 84 }; 85 86 87 #endif /* NRF51_RNG_H */ 88