/* * This file is part of the coreboot project. * * Copyright (C) 2013 Alexandru Gagniuc <mr.nuke.me@gmail.com> * * 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; 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. * * Definitions for UART on Allwinner CPUs * * The UART on the A10 seems to be 8250-compatible, however, this has not been * verified. Our 8250mem code is specific to x86, and does not yet work, so we * have to re-implement it ARM-style for the time being. The register * definitions are present in <uart7250.h>, and are not redefined here. * */ #ifndef CPU_ALLWINNER_A10_UART_H #define CPU_ALLWINNER_A10_UART_H #include <types.h> #include <compiler.h> struct a10_uart { union { /* operational mode */ u32 rbr; /* receiver buffer (read) */ u32 thr; /* transmit holding (write) */ /* config mode (DLAB set) */ u32 dll; /* divisor latches low */ }; union { /* operational mode */ u32 ier; /* interrupt enable */ /* config mode (DLAB set) */ u32 dlh; /* divisor latches high */ }; union { u32 iir; /* interrupt ID (read) */ u32 fcr; /* FIFO control (write) */ }; u32 lcr; /* line control */ /* 0x10 */ u32 mcr; /* modem control */ u32 lsr; /* line status, read-only */ u32 msr; /* modem status */ u32 sch; /* scratch register */ u8 reserved_0x20[0x50]; /* 0x70 */ u8 reserved_0x70[0xc]; u32 usr; /* UART status register */ /* 0x80 */ u32 tfl; /* Transmit FIFO level */ u32 rfl; /* Receive FIFO level */ u8 reserved_0x88[0x18]; /* 0xa0 */ u8 reserved_0xa0[4]; u32 halt; /* Halt register */ } __packed; enum uart_parity { UART_PARITY_NONE, UART_PARITY_EVEN, UART_PARITY_ODD, }; #endif /* CPU_ALLWINNER_A10_UART_H */