include/hw/gpio/nrf51_gpio.h

   1 /*
   2  * nRF51 System-on-Chip general purpose input/output register definition
   3  *
   4  * QEMU interface:
   5  * + sysbus MMIO regions 0: GPIO registers
   6  * + Unnamed GPIO inputs 0-31: Set tri-state input level for GPIO pin.
   7  *   Level -1: Externally Disconnected/Floating; Pull-up/down will be regarded
   8  *   Level 0: Input externally driven LOW
   9  *   Level 1: Input externally driven HIGH
  10  * + Unnamed GPIO outputs 0-31:
  11  *   Level -1: Disconnected/Floating
  12  *   Level 0: Driven LOW
  13  *   Level 1: Driven HIGH
  14  *
  15  * Accuracy of the peripheral model:
  16  * + The nRF51 GPIO output driver supports two modes, standard and high-current
  17  *   mode. These different drive modes are not modeled and handled the same.
  18  * + Pin SENSEing is not modeled/implemented.
  19  *
  20  * Copyright 2018 Steffen Görtz <contrib@steffen-goertz.de>
  21  *
  22  * This code is licensed under the GPL version 2 or later.  See
  23  * the COPYING file in the top-level directory.
  24  *
  25  */
  26 #ifndef NRF51_GPIO_H
  27 #define NRF51_GPIO_H
  28
  29 #include "hw/sysbus.h"
  30 #define TYPE_NRF51_GPIO "nrf51_soc.gpio"
  31 #define NRF51_GPIO(obj) OBJECT_CHECK(NRF51GPIOState, (obj), TYPE_NRF51_GPIO)
  32
  33 #define NRF51_GPIO_PINS 32
  34
  35 #define NRF51_GPIO_SIZE 0x1000
  36
  37 #define NRF51_GPIO_REG_OUT          0x504
  38 #define NRF51_GPIO_REG_OUTSET       0x508
  39 #define NRF51_GPIO_REG_OUTCLR       0x50C
  40 #define NRF51_GPIO_REG_IN           0x510
  41 #define NRF51_GPIO_REG_DIR          0x514
  42 #define NRF51_GPIO_REG_DIRSET       0x518
  43 #define NRF51_GPIO_REG_DIRCLR       0x51C
  44 #define NRF51_GPIO_REG_CNF_START    0x700
  45 #define NRF51_GPIO_REG_CNF_END      0x77C
  46
  47 #define NRF51_GPIO_PULLDOWN 1
  48 #define NRF51_GPIO_PULLUP 3
  49
  50 typedef struct NRF51GPIOState {
  51     SysBusDevice parent_obj;
  52
  53     MemoryRegion mmio;
  54     qemu_irq irq;
  55
  56     uint32_t out;
  57     uint32_t in;
  58     uint32_t in_mask;
  59     uint32_t dir;
  60     uint32_t cnf[NRF51_GPIO_PINS];
  61
  62     uint32_t old_out;
  63     uint32_t old_out_connected;
  64
  65     qemu_irq output[NRF51_GPIO_PINS];
  66 } NRF51GPIOState;
  67
  68
  69 #endif