1 /* 2 * linux/drivers/char/8250.h 3 * 4 * Driver for 8250/16550-type serial ports 5 * 6 * Based on drivers/char/serial.c, by Linus Torvalds, Theodore Ts'o. 7 * 8 * Copyright (C) 2001 Russell King. 9 * 10 * This program is free software; you can redistribute it and/or modify 11 * it under the terms of the GNU General Public License as published by 12 * the Free Software Foundation; either version 2 of the License, or 13 * (at your option) any later version. 14 */ 15 16 #include <linux/serial_8250.h> 17 18 struct old_serial_port { 19 unsigned int uart; 20 unsigned int baud_base; 21 unsigned int port; 22 unsigned int irq; 23 unsigned int flags; 24 unsigned char hub6; 25 unsigned char io_type; 26 unsigned char *iomem_base; 27 unsigned short iomem_reg_shift; 28 }; 29 30 /* 31 * This replaces serial_uart_config in include/linux/serial.h 32 */ 33 struct serial8250_config { 34 const char *name; 35 unsigned short fifo_size; 36 unsigned short tx_loadsz; 37 unsigned char fcr; 38 unsigned int flags; 39 }; 40 41 #define UART_CAP_FIFO (1 << 8) /* UART has FIFO */ 42 #define UART_CAP_EFR (1 << 9) /* UART has EFR */ 43 #define UART_CAP_SLEEP (1 << 10) /* UART has IER sleep */ 44 #define UART_CAP_AFE (1 << 11) /* MCR-based hw flow control */ 45 #define UART_CAP_UUE (1 << 12) /* UART needs IER bit 6 set (Xscale) */ 46 47 #define UART_BUG_QUOT (1 << 0) /* UART has buggy quot LSB */ 48 #define UART_BUG_TXEN (1 << 1) /* UART has buggy TX IIR status */ 49 #define UART_BUG_NOMSR (1 << 2) /* UART has buggy MSR status bits (Au1x00) */ 50 #define UART_BUG_THRE (1 << 3) /* UART has buggy THRE reassertion */ 51 52 #define PROBE_RSA (1 << 0) 53 #define PROBE_ANY (~0) 54 55 #define HIGH_BITS_OFFSET ((sizeof(long)-sizeof(int))*8) 56 57 #ifdef CONFIG_SERIAL_8250_SHARE_IRQ 58 #define SERIAL8250_SHARE_IRQS 1 59 #else 60 #define SERIAL8250_SHARE_IRQS 0 61 #endif 62 63 #if defined(__alpha__) && !defined(CONFIG_PCI) 64 /* 65 * Digital did something really horribly wrong with the OUT1 and OUT2 66 * lines on at least some ALPHA's. The failure mode is that if either 67 * is cleared, the machine locks up with endless interrupts. 68 */ 69 #define ALPHA_KLUDGE_MCR (UART_MCR_OUT2 | UART_MCR_OUT1) 70 #elif defined(CONFIG_SBC8560) 71 /* 72 * WindRiver did something similarly broken on their SBC8560 board. The 73 * UART tristates its IRQ output while OUT2 is clear, but they pulled 74 * the interrupt line _up_ instead of down, so if we register the IRQ 75 * while the UART is in that state, we die in an IRQ storm. */ 76 #define ALPHA_KLUDGE_MCR (UART_MCR_OUT2) 77 #else 78 #define ALPHA_KLUDGE_MCR 0 79 #endif 80