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   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/cpu-regs.h>
  15 #include <asm/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  * dispose of the /dev/ttyS0 serial port
  25  */
  26 #ifndef CONFIG_GDBSTUB_ON_TTYSx
  27
  28 #define SERIAL_PORT_DFNS                                                \
  29         {                                                               \
  30         .baud_base              = BASE_BAUD,                            \
  31         .irq                    = SERIAL_IRQ,                           \
  32         .flags                  = STD_COM_FLAGS,                        \
  33         .iomem_base             = (u8 *) SERIAL_PORT0_BASE_ADDRESS,     \
  34         .iomem_reg_shift        = 2,                                    \
  35         .io_type                = SERIAL_IO_MEM,                        \
  36         },
  37
  38 #ifndef __ASSEMBLY__
  39
  40 static inline void __debug_to_serial(const char *p, int n)
  41 {
  42 }
  43
  44 #endif /* !__ASSEMBLY__ */
  45
  46 #else /* CONFIG_GDBSTUB_ON_TTYSx */
  47
  48 #define SERIAL_PORT_DFNS /* stolen by gdb-stub */
  49
  50 #if defined(CONFIG_GDBSTUB_ON_TTYS0)
  51 #define GDBPORT_SERIAL_RX       __SYSREG(SERIAL_PORT0_BASE_ADDRESS + UART_RX  * 4, u8)
  52 #define GDBPORT_SERIAL_TX       __SYSREG(SERIAL_PORT0_BASE_ADDRESS + UART_TX  * 4, u8)
  53 #define GDBPORT_SERIAL_DLL      __SYSREG(SERIAL_PORT0_BASE_ADDRESS + UART_DLL * 4, u8)
  54 #define GDBPORT_SERIAL_DLM      __SYSREG(SERIAL_PORT0_BASE_ADDRESS + UART_DLM * 4, u8)
  55 #define GDBPORT_SERIAL_IER      __SYSREG(SERIAL_PORT0_BASE_ADDRESS + UART_IER * 4, u8)
  56 #define GDBPORT_SERIAL_IIR      __SYSREG(SERIAL_PORT0_BASE_ADDRESS + UART_IIR * 4, u8)
  57 #define GDBPORT_SERIAL_FCR      __SYSREG(SERIAL_PORT0_BASE_ADDRESS + UART_FCR * 4, u8)
  58 #define GDBPORT_SERIAL_LCR      __SYSREG(SERIAL_PORT0_BASE_ADDRESS + UART_LCR * 4, u8)
  59 #define GDBPORT_SERIAL_MCR      __SYSREG(SERIAL_PORT0_BASE_ADDRESS + UART_MCR * 4, u8)
  60 #define GDBPORT_SERIAL_LSR      __SYSREG(SERIAL_PORT0_BASE_ADDRESS + UART_LSR * 4, u8)
  61 #define GDBPORT_SERIAL_MSR      __SYSREG(SERIAL_PORT0_BASE_ADDRESS + UART_MSR * 4, u8)
  62 #define GDBPORT_SERIAL_SCR      __SYSREG(SERIAL_PORT0_BASE_ADDRESS + UART_SCR * 4, u8)
  63 #define GDBPORT_SERIAL_IRQ      SERIAL_IRQ
  64
  65 #elif defined(CONFIG_GDBSTUB_ON_TTYS1)
  66 #error The ASB2305 doesnt have a /dev/ttyS1
  67 #endif
  68
  69 #ifndef __ASSEMBLY__
  70
  71 #define TTYS0_TX        __SYSREG(SERIAL_PORT0_BASE_ADDRESS + UART_TX  * 4, u8)
  72 #define TTYS0_MCR       __SYSREG(SERIAL_PORT0_BASE_ADDRESS + UART_MCR * 4, u8)
  73 #define TTYS0_LSR       __SYSREG(SERIAL_PORT0_BASE_ADDRESS + UART_LSR * 4, u8)
  74 #define TTYS0_MSR       __SYSREG(SERIAL_PORT0_BASE_ADDRESS + UART_MSR * 4, u8)
  75
  76 #define LSR_WAIT_FOR(STATE)                             \
  77 do {                                                    \
  78         while (!(TTYS0_LSR & UART_LSR_##STATE)) {}      \
  79 } while (0)
  80 #define FLOWCTL_WAIT_FOR(LINE)                          \
  81 do {                                                    \
  82         while (!(TTYS0_MSR & UART_MSR_##LINE)) {}       \
  83 } while (0)
  84 #define FLOWCTL_CLEAR(LINE)                     \
  85 do {                                            \
  86         TTYS0_MCR &= ~UART_MCR_##LINE;          \
  87 } while (0)
  88 #define FLOWCTL_SET(LINE)                       \
  89 do {                                            \
  90         TTYS0_MCR |= UART_MCR_##LINE;           \
  91 } while (0)
  92 #define FLOWCTL_QUERY(LINE)     ({ TTYS0_MSR & UART_MSR_##LINE; })
  93
  94 static inline void __debug_to_serial(const char *p, int n)
  95 {
  96         char ch;
  97
  98         FLOWCTL_SET(DTR);
  99
 100         for (; n > 0; n--) {
 101                 LSR_WAIT_FOR(THRE);
 102                 FLOWCTL_WAIT_FOR(CTS);
 103
 104                 ch = *p++;
 105                 if (ch == 0x0a) {
 106                         TTYS0_TX = 0x0d;
 107                         LSR_WAIT_FOR(THRE);
 108                         FLOWCTL_WAIT_FOR(CTS);
 109                 }
 110                 TTYS0_TX = ch;
 111         }
 112
 113         FLOWCTL_CLEAR(DTR);
 114 }
 115
 116 #endif /* !__ASSEMBLY__ */
 117
 118 #endif /* CONFIG_GDBSTUB_ON_TTYSx */
 119
 120 #endif /* _ASM_UNIT_SERIAL_H */