LXR linux/arch/mn10300/unit-asb2305/include/unit/serial.h

   1/* ASB2305-specific 8250 serial ports
   2 *
   3 * Copyright (C) 2007 Red Hat, Inc. All Rights Reserved.
   4 * Written by David Howells (dhowells@redhat.com)
   5 *
   6 * This program is free software; you can redistribute it and/or
   7 * modify it under the terms of the GNU General Public Licence
   8 * as published by the Free Software Foundation; either version
   9 * 2 of the Licence, or (at your option) any later version.
  10 */
  11#ifndef _ASM_UNIT_SERIAL_H
  12#define _ASM_UNIT_SERIAL_H
  13
  14#include <asm/cpu-regs.h>
  15#include <proc/irq.h>
  16#include <linux/serial_reg.h>
  17
  18#define SERIAL_PORT0_BASE_ADDRESS       0xA6FB0000
  19#define ASB2305_DEBUG_MCR       __SYSREG(0xA6FB0000 + UART_MCR * 2, u8)
  20
  21#define SERIAL_IRQ      XIRQ0   /* Dual serial (PC16552)        (Hi) */
  22
  23/*
  24 * The ASB2305 has an 18.432 MHz clock the UART
  25 */
  26#define BASE_BAUD       (18432000 / 16)
  27
  28/*
  29 * dispose of the /dev/ttyS0 serial port
  30 */
  31#ifndef CONFIG_GDBSTUB_ON_TTYSx
  32
  33#define SERIAL_PORT_DFNS                                                \
  34        {                                                               \
  35        .baud_base              = BASE_BAUD,                            \
  36        .irq                    = SERIAL_IRQ,                           \
  37        .flags                  = STD_COM_FLAGS,                        \
  38        .iomem_base             = (u8 *) SERIAL_PORT0_BASE_ADDRESS,     \
  39        .iomem_reg_shift        = 2,                                    \
  40        .io_type                = SERIAL_IO_MEM,                        \
  41        },
  42
  43#ifndef __ASSEMBLY__
  44
  45static inline void __debug_to_serial(const char *p, int n)
  46{
  47}
  48
  49#endif /* !__ASSEMBLY__ */
  50
  51#else /* CONFIG_GDBSTUB_ON_TTYSx */
  52
  53#define SERIAL_PORT_DFNS /* stolen by gdb-stub */
  54
  55#if defined(CONFIG_GDBSTUB_ON_TTYS0)
  56#define GDBPORT_SERIAL_RX       __SYSREG(SERIAL_PORT0_BASE_ADDRESS + UART_RX  * 4, u8)
  57#define GDBPORT_SERIAL_TX       __SYSREG(SERIAL_PORT0_BASE_ADDRESS + UART_TX  * 4, u8)
  58#define GDBPORT_SERIAL_DLL      __SYSREG(SERIAL_PORT0_BASE_ADDRESS + UART_DLL * 4, u8)
  59#define GDBPORT_SERIAL_DLM      __SYSREG(SERIAL_PORT0_BASE_ADDRESS + UART_DLM * 4, u8)
  60#define GDBPORT_SERIAL_IER      __SYSREG(SERIAL_PORT0_BASE_ADDRESS + UART_IER * 4, u8)
  61#define GDBPORT_SERIAL_IIR      __SYSREG(SERIAL_PORT0_BASE_ADDRESS + UART_IIR * 4, u8)
  62#define GDBPORT_SERIAL_FCR      __SYSREG(SERIAL_PORT0_BASE_ADDRESS + UART_FCR * 4, u8)
  63#define GDBPORT_SERIAL_LCR      __SYSREG(SERIAL_PORT0_BASE_ADDRESS + UART_LCR * 4, u8)
  64#define GDBPORT_SERIAL_MCR      __SYSREG(SERIAL_PORT0_BASE_ADDRESS + UART_MCR * 4, u8)
  65#define GDBPORT_SERIAL_LSR      __SYSREG(SERIAL_PORT0_BASE_ADDRESS + UART_LSR * 4, u8)
  66#define GDBPORT_SERIAL_MSR      __SYSREG(SERIAL_PORT0_BASE_ADDRESS + UART_MSR * 4, u8)
  67#define GDBPORT_SERIAL_SCR      __SYSREG(SERIAL_PORT0_BASE_ADDRESS + UART_SCR * 4, u8)
  68#define GDBPORT_SERIAL_IRQ      SERIAL_IRQ
  69
  70#elif defined(CONFIG_GDBSTUB_ON_TTYS1)
  71#error The ASB2305 doesnt have a /dev/ttyS1
  72#endif
  73
  74#ifndef __ASSEMBLY__
  75
  76#define TTYS0_TX        __SYSREG(SERIAL_PORT0_BASE_ADDRESS + UART_TX  * 4, u8)
  77#define TTYS0_MCR       __SYSREG(SERIAL_PORT0_BASE_ADDRESS + UART_MCR * 4, u8)
  78#define TTYS0_LSR       __SYSREG(SERIAL_PORT0_BASE_ADDRESS + UART_LSR * 4, u8)
  79#define TTYS0_MSR       __SYSREG(SERIAL_PORT0_BASE_ADDRESS + UART_MSR * 4, u8)
  80
  81#define LSR_WAIT_FOR(STATE)                             \
  82do {                                                    \
  83        while (!(TTYS0_LSR & UART_LSR_##STATE)) {}      \
  84} while (0)
  85#define FLOWCTL_WAIT_FOR(LINE)                          \
  86do {                                                    \
  87        while (!(TTYS0_MSR & UART_MSR_##LINE)) {}       \
  88} while (0)
  89#define FLOWCTL_CLEAR(LINE)                     \
  90do {                                            \
  91        TTYS0_MCR &= ~UART_MCR_##LINE;          \
  92} while (0)
  93#define FLOWCTL_SET(LINE)                       \
  94do {                                            \
  95        TTYS0_MCR |= UART_MCR_##LINE;           \
  96} while (0)
  97#define FLOWCTL_QUERY(LINE)     ({ TTYS0_MSR & UART_MSR_##LINE; })
  98
  99static inline void __debug_to_serial(const char *p, int n)
 100{
 101        char ch;
 102
 103        FLOWCTL_SET(DTR);
 104
 105        for (; n > 0; n--) {
 106                LSR_WAIT_FOR(THRE);
 107                FLOWCTL_WAIT_FOR(CTS);
 108
 109                ch = *p++;
 110                if (ch == 0x0a) {
 111                        TTYS0_TX = 0x0d;
 112                        LSR_WAIT_FOR(THRE);
 113                        FLOWCTL_WAIT_FOR(CTS);
 114                }
 115                TTYS0_TX = ch;
 116        }
 117
 118        FLOWCTL_CLEAR(DTR);
 119}
 120
 121#endif /* !__ASSEMBLY__ */
 122
 123#endif /* CONFIG_GDBSTUB_ON_TTYSx */
 124
 125#endif /* _ASM_UNIT_SERIAL_H */
 126