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 #define TYPE_NRF51_RNG "nrf51_soc.rng" 40 #define NRF51_RNG(obj) OBJECT_CHECK(NRF51RNGState, (obj), TYPE_NRF51_RNG) 41 42 #define NRF51_RNG_SIZE 0x1000 43 44 #define NRF51_RNG_TASK_START 0x000 45 #define NRF51_RNG_TASK_STOP 0x004 46 #define NRF51_RNG_EVENT_VALRDY 0x100 47 #define NRF51_RNG_REG_SHORTS 0x200 48 #define NRF51_RNG_REG_SHORTS_VALRDY_STOP 0 49 #define NRF51_RNG_REG_INTEN 0x300 50 #define NRF51_RNG_REG_INTEN_VALRDY 0 51 #define NRF51_RNG_REG_INTENSET 0x304 52 #define NRF51_RNG_REG_INTENCLR 0x308 53 #define NRF51_RNG_REG_CONFIG 0x504 54 #define NRF51_RNG_REG_CONFIG_DECEN 0 55 #define NRF51_RNG_REG_VALUE 0x508 56 57 typedef struct { 58 SysBusDevice parent_obj; 59 60 MemoryRegion mmio; 61 qemu_irq irq; 62 63 /* Event End Points */ 64 qemu_irq eep_valrdy; 65 66 QEMUTimer timer; 67 68 /* Time between generation of successive unfiltered values in us */ 69 uint16_t period_unfiltered_us; 70 /* Time between generation of successive filtered values in us */ 71 uint16_t period_filtered_us; 72 73 uint8_t value; 74 75 uint32_t active; 76 uint32_t event_valrdy; 77 uint32_t shortcut_stop_on_valrdy; 78 uint32_t interrupt_enabled; 79 uint32_t filter_enabled; 80 81 } NRF51RNGState; 82 83 84 #endif /* NRF51_RNG_H */ 85