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SiFive RISC-V GPIO Device

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QEMU model of the GPIO device on the SiFive E300 series SOCs.

The pins are not used by a board definition yet, however this
implementation can already be used to trigger GPIO interrupts from the
software by configuring a pin as both output and input.

Signed-off-by: Fabien Chouteau <chouteau@adacore.com>
Reviewed-by: Palmer Dabbelt <palmer@sifive.com>
Signed-off-by: Palmer Dabbelt <palmer@sifive.com>
This commit is contained in:
Fabien Chouteau 2019-02-12 18:38:39 +01:00 • committed by Palmer Dabbelt
parent a7b21f6762
commit 30efbf330a
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GPG key ID: EF4CA1502CCBAB41
7 changed files with 501 additions and 4 deletions
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72
include/hw/riscv/sifive_gpio.h Normal file
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/*
* sifive System-on-Chip general purpose input/output register definition
*
* Copyright 2019 AdaCore
*
* Base on nrf51_gpio.c:
*
* Copyright 2018 Steffen Görtz <contrib@steffen-goertz.de>
*
* This code is licensed under the GPL version 2 or later. See
* the COPYING file in the top-level directory.
*/
#ifndef SIFIVE_GPIO_H
#define SIFIVE_GPIO_H
#include "hw/sysbus.h"
#define TYPE_SIFIVE_GPIO "sifive_soc.gpio"
#define SIFIVE_GPIO(obj) OBJECT_CHECK(SIFIVEGPIOState, (obj), TYPE_SIFIVE_GPIO)
#define SIFIVE_GPIO_PINS 32
#define SIFIVE_GPIO_SIZE 0x100
#define SIFIVE_GPIO_REG_VALUE 0x000
#define SIFIVE_GPIO_REG_INPUT_EN 0x004
#define SIFIVE_GPIO_REG_OUTPUT_EN 0x008
#define SIFIVE_GPIO_REG_PORT 0x00C
#define SIFIVE_GPIO_REG_PUE 0x010
#define SIFIVE_GPIO_REG_DS 0x014
#define SIFIVE_GPIO_REG_RISE_IE 0x018
#define SIFIVE_GPIO_REG_RISE_IP 0x01C
#define SIFIVE_GPIO_REG_FALL_IE 0x020
#define SIFIVE_GPIO_REG_FALL_IP 0x024
#define SIFIVE_GPIO_REG_HIGH_IE 0x028
#define SIFIVE_GPIO_REG_HIGH_IP 0x02C
#define SIFIVE_GPIO_REG_LOW_IE 0x030
#define SIFIVE_GPIO_REG_LOW_IP 0x034
#define SIFIVE_GPIO_REG_IOF_EN 0x038
#define SIFIVE_GPIO_REG_IOF_SEL 0x03C
#define SIFIVE_GPIO_REG_OUT_XOR 0x040
typedef struct SIFIVEGPIOState {
SysBusDevice parent_obj;
MemoryRegion mmio;
qemu_irq irq[SIFIVE_GPIO_PINS];
qemu_irq output[SIFIVE_GPIO_PINS];
uint32_t value; /* Actual value of the pin */
uint32_t input_en;
uint32_t output_en;
uint32_t port; /* Pin value requested by the user */
uint32_t pue;
uint32_t ds;
uint32_t rise_ie;
uint32_t rise_ip;
uint32_t fall_ie;
uint32_t fall_ip;
uint32_t high_ie;
uint32_t high_ip;
uint32_t low_ie;
uint32_t low_ip;
uint32_t iof_en;
uint32_t iof_sel;
uint32_t out_xor;
uint32_t in;
uint32_t in_mask;
} SIFIVEGPIOState;
#endif