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/* This file is part of the coreboot project. */
/*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License as
* published by the Free Software Foundation; either version 2 of
* the License, or (at your option) any later version.
*
* This program is distributed in the hope that 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.
*/
#ifndef AM335X_UART_H
#define AM335X_UART_H
#include <stdint.h>
#define AM335X_UART0_BASE 0x44e09000
#define AM335X_UART1_BASE 0x48020000
#define AM335X_UART2_BASE 0x48024000
#define AM335X_UART3_BASE 0x481A6000
#define AM335X_UART4_BASE 0x481A8000
#define AM335X_UART5_BASE 0x481AA000
/*
* The meaning of some AM335x UART register offsets changes depending on read
* or write operation as well as various modes. See section 19.3.7.1.2 for
* register access submode description and 19.5.1 for register descriptions.
*/
struct am335x_uart {
union {
/* operational mode */
uint16_t rhr; /* receiver holding (read) */
uint16_t thr; /* transmit holding (write) */
/* config mode A and B */
uint16_t dll; /* divisor latches low */
};
uint8_t rsvd_0x02[2];
union {
/* operational mode */
uint16_t ier; /* interrupt enable */
/* config mode A and B */
uint16_t dlh; /* divisor latches high */
};
uint8_t rsvd_0x06[2];
union {
/* operational mode, config mode A */
uint16_t iir; /* interrupt ID (read) */
uint16_t fcr; /* FIFO control (write) */
/* config mode B */
uint16_t efr;
};
uint8_t rsvd_0x0a[2];
uint16_t lcr; /* line control */
uint8_t rsvd_0x0e[2];
/* 0x10 */
union {
/* operational mode, config mode A */
uint16_t mcr; /* modem control */
/* config mode B */
uint16_t xon1; /* XON1 character (UART mode) */
uint16_t addr1; /* address 1 (IrDA mode) */
};
uint8_t rsvd_0x12[2];
union {
/* operational mode, config mode A */
uint16_t lsr; /* line status, read-only */
/* config mode B */
uint16_t xon2; /* XON2 character (UART mode) */
uint16_t addr2; /* IrDA mode (IrDA mode) */
};
uint8_t rsvd_0x16[2];
/*
* Bytes 0x18 and 0x1c depend on submode TCR_TLR. When EFR[4] = 1 and
* MCR[6] = 1, transmission control register and trigger level register
* will be read/written. If not, the modem status register and the
* scratchpad register will be affected by read/write.
*/
union {
/* operational mode and config mode A */
uint16_t msr; /* modem status */
/* config mode B */
uint16_t xoff1; /* xoff1 character (UART MODE) */
/* submode TCR_TLR */
uint16_t tcr; /* transmission control */
};
uint8_t rsvd_0x1a[2];
union {
uint16_t spr; /* scratchpad */
/* config mode B */
uint16_t xoff2; /* xoff2 character (UART mode) */
/* submode TCR_TLR */
uint16_t tlr; /* trigger level */
};
uint8_t rsvd_0x1e[2];
/* 0x20 */
uint16_t mdr1; /* mode definition 1 */
uint8_t rsvd_0x22[2];
uint16_t mdr2; /* mode definition 2 */
uint8_t rsvd_0x26[2];
union {
uint16_t sflsr; /* status FIFO line status reg (read) */
uint16_t txfll; /* transmit frame length low (write) */
};
uint8_t rsvd_0x2a[2];
union {
uint16_t resume; /* resume halted operation (read) */
uint16_t txflh; /* transmit frame length high (write) */
};
uint8_t rsvd_0x2e[2];
/* 0x30 */
union {
uint16_t sfregl; /* status FIFO low (read) */
uint16_t rxfll; /* received frame length low (write) */
};
uint8_t rsvd_0x32[2];
union {
uint16_t sfregh; /* status FIFO high (read) */
uint16_t rxflh; /* received frame length high (write) */
};
uint8_t rsvd_0x36[2];
uint16_t blr; /* BOF control */
uint8_t rsvd_0x3a[2];
uint16_t acreg; /* auxiliary control */
uint8_t rsvd_0x3e[2];
/* 0x40 */
uint16_t scr; /* supplementary control */
uint8_t rsvd_0x42[2];
uint16_t ssr; /* supplementary status */
uint8_t rsvd_0x46[2];
uint16_t eblr; /* BOF length (operational mode only) */
uint8_t rsvd_0x4a[6];
/* 0x50 */
uint16_t mvr; /* module version (read-only) */
uint8_t rsvd_0x52[2];
uint16_t sysc; /* system config */
uint8_t rsvd_0x56[2];
uint16_t syss; /* system status (read-only) */
uint8_t rsvd_0x5a[2];
uint16_t wer; /* wake-up enable */
uint8_t rsvd_0x5e[2];
/* 0x60 */
uint16_t cfps; /* carrier prescale frequency */
uint8_t rsvd_0x62[2];
uint16_t rxfifo_lvl; /* received FIFO level */
uint8_t rsvd_0x66[2];
uint16_t txfifo_lvl; /* transmit FIFO level */
uint8_t rsvd_0x6a[2];
uint16_t ier2; /* RX/TX FIFO empty interrupt enable */
uint8_t rsvd_0x6e[2];
/* 0x70 */
uint16_t isr2; /* RX/TX FIFO empty interrupt status */
uint8_t rsvd_0x72[2];
uint16_t freq_sel; /* frequency select */
uint8_t rsvd_0x76[10];
/* 0x80 */
uint16_t mdr3; /* mode definition register 3 */
uint8_t rsvd_0x82[2];
uint16_t txdma; /* TX DMA threshold */
} __packed;
#endif /* AM335X_UART_H */
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