/*
* Copyright (c) 2018 naehrwert
* Copyright (c) 2018-2020 Atmosphère-NX
*
* This program is free software; you can redistribute it and/or modify it
* under the terms and conditions of the GNU General Public License,
* version 2, as published by the Free Software Foundation.
*
* This program is distributed in the hope it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
* more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#ifndef FUSEE_UART_H
#define FUSEE_UART_H
#include <string.h>
#define UART_BASE 0x70006000
#define BAUD_115200 115200
/* UART devices */
typedef enum {
UART_A = 0,
UART_B = 1,
UART_C = 2,
UART_D = 3,
UART_E = 4,
} UartDevice;
/* 36.3.12 UART_VENDOR_STATUS_0_0 */
typedef enum {
UART_VENDOR_STATE_TX_IDLE = 1 << 0,
UART_VENDOR_STATE_RX_IDLE = 1 << 1,
/* This bit is set to 1 when a read is issued to an empty FIFO and gets cleared on register read (sticky bit until read)
0 = NO_UNDERRUN
1 = UNDERRUN
*/
UART_VENDOR_STATE_RX_UNDERRUN = 1 << 2,
/* This bit is set to 1 when write data is issued to the TX FIFO when it is already full and gets cleared on register read (sticky bit until read)
0 = NO_OVERRUN
1 = OVERRUN
*/
UART_VENDOR_STATE_TX_OVERRUN = 1 << 3,
UART_VENDOR_STATE_RX_FIFO_COUNTER = 0b111111 << 16, /* reflects number of current entries in RX FIFO */
UART_VENDOR_STATE_TX_FIFO_COUNTER = 0b111111 << 24 /* reflects number of current entries in TX FIFO */
} UartVendorStatus;
/* 36.3.6 UART_LSR_0 */
typedef enum {
UART_LSR_RDR = 1 << 0, /* Receiver Data Ready */
UART_LSR_OVRF = 1 << 1, /* Receiver Overrun Error */
UART_LSR_PERR = 1 << 2, /* Parity Error */
UART_LSR_FERR = 1 << 3, /* Framing Error */
UART_LSR_BRK = 1 << 4, /* BREAK condition detected on line */
UART_LSR_THRE = 1 << 5, /* Transmit Holding Register is Empty -- OK to write data */
UART_LSR_TMTY = 1 << 6, /* Transmit Shift Register empty status */
UART_LSR_FIFOE = 1 << 7, /* Receive FIFO Error */
UART_LSR_TX_FIFO_FULL = 1 << 8, /* Transmitter FIFO full status */
UART_LSR_RX_FIFO_EMPTY = 1 << 9, /* Receiver FIFO empty status */
} UartLineStatus;
/* 36.3.4 UART_LCR_0 */
typedef enum {
UART_LCR_WD_LENGTH_5 = 0, /* word length 5 */
UART_LCR_WD_LENGTH_6 = 1, /* word length 6 */
UART_LCR_WD_LENGTH_7 = 2, /* word length 7 */
UART_LCR_WD_LENGTH_8 = 3, /* word length 8 */
/* STOP:
0 = Transmit 1 stop bit
1 = Transmit 2 stop bits (receiver always checks for 1 stop bit)
*/
UART_LCR_STOP = 1 << 2,
UART_LCR_PAR = 1 << 3, /* Parity enabled */
UART_LCR_EVEN = 1 << 4, /* Even parity format. There will always be an even number of 1s in the binary representation (PAR = 1) */
UART_LCR_SET_P = 1 << 5, /* Set (force) parity to value in LCR[4] */
UART_LCR_SET_B = 1 << 6, /* Set BREAK condition -- Transmitter sends all zeroes to indicate BREAK */
UART_LCR_DLAB = 1 << 7, /* Divisor Latch Access Bit (set to allow programming of the DLH, DLM Divisors) */
} UartLineControl;
/* 36.3.3 UART_IIR_FCR_0 */
typedef enum {
UART_FCR_FCR_EN_FIFO = 1 << 0, /* Enable the transmit and receive FIFOs. This bit should be enabled */
UART_FCR_RX_CLR = 1 << 1, /* Clears the contents of the receive FIFO and resets its counter logic to 0 (the receive shift register is not cleared or altered). This bit returns to 0 after clearing the FIFOs */
UART_FCR_TX_CLR = 1 << 2, /* Clears the contents of the transmit FIFO and resets its counter logic to 0 (the transmit shift register is not cleared or altered). This bit returns to 0 after clearing the FIFOs */
/* DMA:
0 = DMA_MODE_0
1 = DMA_MODE_1
*/
UART_FCR_DMA = 1 << 3,
/* TX_TRIG
0 = FIFO_COUNT_GREATER_16
1 = FIFO_COUNT_GREATER_8
2 = FIFO_COUNT_GREATER_4
3 = FIFO_COUNT_GREATER_1
*/
UART_FCR_TX_TRIG = 3 << 4,
UART_FCR_TX_TRIG_FIFO_COUNT_GREATER_16 = 0 << 4,
UART_FCR_TX_TRIG_FIFO_COUNT_GREATER_8 = 1 << 4,
UART_FCR_TX_TRIG_FIFO_COUNT_GREATER_4 = 2 << 4,
UART_FCR_TX_TRIG_FIFO_COUNT_GREATER_1 = 3 << 4,
/* RX_TRIG
0 = FIFO_COUNT_GREATER_1
1 = FIFO_COUNT_GREATER_4
2 = FIFO_COUNT_GREATER_8
3 = FIFO_COUNT_GREATER_16
*/
UART_FCR_RX_TRIG = 3 << 6,
UART_FCR_RX_TRIG_FIFO_COUNT_GREATER_1 = 0 << 6,
UART_FCR_RX_TRIG_FIFO_COUNT_GREATER_4 = 1 << 6,
UART_FCR_RX_TRIG_FIFO_COUNT_GREATER_8 = 2 << 6,
UART_FCR_RX_TRIG_FIFO_COUNT_GREATER_16 = 3 << 6,
} UartFifoControl;
/* 36.3.3 UART_IIR_FCR_0 */
typedef enum {
UART_IIR_IS_STA = 1 << 0, /* Interrupt Pending if ZERO */
UART_IIR_IS_PRI0 = 1 << 1, /* Encoded Interrupt ID Refer to IIR[3:0] table [36.3.3] */
UART_IIR_IS_PRI1 = 1 << 2, /* Encoded Interrupt ID Refer to IIR[3:0] table */
UART_IIR_IS_PRI2 = 1 << 3, /* Encoded Interrupt ID Refer to IIR[3:0] table */
/* FIFO Mode Status
0 = 16450 mode (no FIFO)
1 = 16550 mode (FIFO)
*/
UART_IIR_EN_FIFO = 3 << 6,
UART_IIR_MODE_16450 = 0 << 6,
UART_IIR_MODE_16550 = 1 << 6,
} UartInterruptIdentification;
typedef struct {
uint32_t UART_THR_DLAB;
uint32_t UART_IER_DLAB;
uint32_t UART_IIR_FCR;
uint32_t UART_LCR;
uint32_t UART_MCR;
uint32_t UART_LSR;
uint32_t UART_MSR;
uint32_t UART_SPR;
uint32_t UART_IRDA_CSR;
uint32_t UART_RX_FIFO_CFG;
uint32_t UART_MIE;
uint32_t UART_VENDOR_STATUS;
uint8_t _0x30[0x0C];
uint32_t UART_ASR;
} tegra_uart_t;
void uart_config(UartDevice dev);
void uart_init(UartDevice dev, uint32_t baud);
void uart_wait_idle(UartDevice dev, UartVendorStatus status);
void uart_send(UartDevice dev, const void *buf, size_t len);
void uart_recv(UartDevice dev, void *buf, size_t len);
static inline volatile tegra_uart_t *uart_get_regs(UartDevice dev) {
static const size_t offsets[] = {0, 0x40, 0x200, 0x300, 0x400};
return (volatile tegra_uart_t *)(UART_BASE + offsets[dev]);
}
#endif
