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hw/char: Add Shakti UART emulation

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This is the initial implementation of Shakti UART.

Signed-off-by: Vijai Kumar K <vijai@behindbytes.com>
Reviewed-by: Alistair Francis <alistair.francis@wdc.com>
Message-id: 20210401181457.73039-4-vijai@behindbytes.com
Signed-off-by: Alistair Francis <alistair.francis@wdc.com>
This commit is contained in:
Vijai Kumar K 2021-04-01 23:44:56 +05:30 • committed by Alistair Francis
parent 7a261bafc8
commit 07f334d89d
5 changed files with 266 additions and 0 deletions
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74
include/hw/char/shakti_uart.h Normal file
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/*
* SHAKTI UART
*
* Copyright (c) 2021 Vijai Kumar K <vijai@behindbytes.com>
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
* THE SOFTWARE.
*/
#ifndef HW_SHAKTI_UART_H
#define HW_SHAKTI_UART_H
#include "hw/sysbus.h"
#include "chardev/char-fe.h"
#define SHAKTI_UART_BAUD 0x00
#define SHAKTI_UART_TX 0x04
#define SHAKTI_UART_RX 0x08
#define SHAKTI_UART_STATUS 0x0C
#define SHAKTI_UART_DELAY 0x10
#define SHAKTI_UART_CONTROL 0x14
#define SHAKTI_UART_INT_EN 0x18
#define SHAKTI_UART_IQ_CYCLES 0x1C
#define SHAKTI_UART_RX_THRES 0x20
#define SHAKTI_UART_STATUS_TX_EMPTY (1 << 0)
#define SHAKTI_UART_STATUS_TX_FULL (1 << 1)
#define SHAKTI_UART_STATUS_RX_NOT_EMPTY (1 << 2)
#define SHAKTI_UART_STATUS_RX_FULL (1 << 3)
/* 9600 8N1 is the default setting */
/* Reg value = (50000000 Hz)/(16 * 9600)*/
#define SHAKTI_UART_BAUD_DEFAULT 0x0145
#define SHAKTI_UART_CONTROL_DEFAULT 0x0100
#define TYPE_SHAKTI_UART "shakti-uart"
#define SHAKTI_UART(obj) \
OBJECT_CHECK(ShaktiUartState, (obj), TYPE_SHAKTI_UART)
typedef struct {
/* <private> */
SysBusDevice parent_obj;
/* <public> */
MemoryRegion mmio;
uint32_t uart_baud;
uint32_t uart_tx;
uint32_t uart_rx;
uint32_t uart_status;
uint32_t uart_delay;
uint32_t uart_control;
uint32_t uart_interrupt;
uint32_t uart_iq_cycles;
uint32_t uart_rx_threshold;
CharBackend chr;
} ShaktiUartState;
#endif /* HW_SHAKTI_UART_H */