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
  45 static 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)                             \
  82 do {                                                    \
  83         while (!(TTYS0_LSR & UART_LSR_##STATE)) {}      \
  84 } while (0)
  85 #define FLOWCTL_WAIT_FOR(LINE)                          \
  86 do {                                                    \
  87         while (!(TTYS0_MSR & UART_MSR_##LINE)) {}       \
  88 } while (0)
  89 #define FLOWCTL_CLEAR(LINE)                     \
  90 do {                                            \
  91         TTYS0_MCR &= ~UART_MCR_##LINE;          \
  92 } while (0)
  93 #define FLOWCTL_SET(LINE)                       \
  94 do {                                            \
  95         TTYS0_MCR |= UART_MCR_##LINE;           \
  96 } while (0)
  97 #define FLOWCTL_QUERY(LINE)     ({ TTYS0_MSR & UART_MSR_##LINE; })
  98
  99 static 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 */