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   1 /* ASB2303-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
  12 #ifndef _ASM_UNIT_SERIAL_H
  13 #define _ASM_UNIT_SERIAL_H
  14
  15 #include <asm/cpu-regs.h>
  16 #include <asm/proc/irq.h>
  17 #include <linux/serial_reg.h>
  18
  19 #define SERIAL_PORT0_BASE_ADDRESS       0xA6FB0000
  20 #define SERIAL_PORT1_BASE_ADDRESS       0xA6FC0000
  21
  22 #define SERIAL_IRQ      XIRQ0   /* Dual serial (PC16552)        (Hi) */
  23
  24 /*
  25  * dispose of the /dev/ttyS0 and /dev/ttyS1 serial ports
  26  */
  27 #ifndef CONFIG_GDBSTUB_ON_TTYSx
  28
  29 #define SERIAL_PORT_DFNS                                                \
  30         {                                                               \
  31         .baud_base              = BASE_BAUD,                            \
  32         .irq                    = SERIAL_IRQ,                           \
  33         .flags                  = STD_COM_FLAGS,                        \
  34         .iomem_base             = (u8 *) SERIAL_PORT0_BASE_ADDRESS,     \
  35         .iomem_reg_shift        = 2,                                    \
  36         .io_type                = SERIAL_IO_MEM,                        \
  37         },                                                              \
  38         {                                                               \
  39         .baud_base              = BASE_BAUD,                            \
  40         .irq                    = SERIAL_IRQ,                           \
  41         .flags                  = STD_COM_FLAGS,                        \
  42         .iomem_base             = (u8 *) SERIAL_PORT1_BASE_ADDRESS,     \
  43         .iomem_reg_shift        = 2,                                    \
  44         .io_type                = SERIAL_IO_MEM,                        \
  45         },
  46
  47 #ifndef __ASSEMBLY__
  48
  49 static inline void __debug_to_serial(const char *p, int n)
  50 {
  51 }
  52
  53 #endif /* !__ASSEMBLY__ */
  54
  55 #else /* CONFIG_GDBSTUB_ON_TTYSx */
  56
  57 #define SERIAL_PORT_DFNS /* both stolen by gdb-stub because they share an IRQ */
  58
  59 #if defined(CONFIG_GDBSTUB_ON_TTYS0)
  60 #define GDBPORT_SERIAL_RX       __SYSREG(SERIAL_PORT0_BASE_ADDRESS + UART_RX  * 4, u8)
  61 #define GDBPORT_SERIAL_TX       __SYSREG(SERIAL_PORT0_BASE_ADDRESS + UART_TX  * 4, u8)
  62 #define GDBPORT_SERIAL_DLL      __SYSREG(SERIAL_PORT0_BASE_ADDRESS + UART_DLL * 4, u8)
  63 #define GDBPORT_SERIAL_DLM      __SYSREG(SERIAL_PORT0_BASE_ADDRESS + UART_DLM * 4, u8)
  64 #define GDBPORT_SERIAL_IER      __SYSREG(SERIAL_PORT0_BASE_ADDRESS + UART_IER * 4, u8)
  65 #define GDBPORT_SERIAL_IIR      __SYSREG(SERIAL_PORT0_BASE_ADDRESS + UART_IIR * 4, u8)
  66 #define GDBPORT_SERIAL_FCR      __SYSREG(SERIAL_PORT0_BASE_ADDRESS + UART_FCR * 4, u8)
  67 #define GDBPORT_SERIAL_LCR      __SYSREG(SERIAL_PORT0_BASE_ADDRESS + UART_LCR * 4, u8)
  68 #define GDBPORT_SERIAL_MCR      __SYSREG(SERIAL_PORT0_BASE_ADDRESS + UART_MCR * 4, u8)
  69 #define GDBPORT_SERIAL_LSR      __SYSREG(SERIAL_PORT0_BASE_ADDRESS + UART_LSR * 4, u8)
  70 #define GDBPORT_SERIAL_MSR      __SYSREG(SERIAL_PORT0_BASE_ADDRESS + UART_MSR * 4, u8)
  71 #define GDBPORT_SERIAL_SCR      __SYSREG(SERIAL_PORT0_BASE_ADDRESS + UART_SCR * 4, u8)
  72 #define GDBPORT_SERIAL_IRQ      SERIAL_IRQ
  73
  74 #elif defined(CONFIG_GDBSTUB_ON_TTYS1)
  75 #define GDBPORT_SERIAL_RX       __SYSREG(SERIAL_PORT1_BASE_ADDRESS + UART_RX  * 4, u8)
  76 #define GDBPORT_SERIAL_TX       __SYSREG(SERIAL_PORT1_BASE_ADDRESS + UART_TX  * 4, u8)
  77 #define GDBPORT_SERIAL_DLL      __SYSREG(SERIAL_PORT1_BASE_ADDRESS + UART_DLL * 4, u8)
  78 #define GDBPORT_SERIAL_DLM      __SYSREG(SERIAL_PORT1_BASE_ADDRESS + UART_DLM * 4, u8)
  79 #define GDBPORT_SERIAL_IER      __SYSREG(SERIAL_PORT1_BASE_ADDRESS + UART_IER * 4, u8)
  80 #define GDBPORT_SERIAL_IIR      __SYSREG(SERIAL_PORT1_BASE_ADDRESS + UART_IIR * 4, u8)
  81 #define GDBPORT_SERIAL_FCR      __SYSREG(SERIAL_PORT1_BASE_ADDRESS + UART_FCR * 4, u8)
  82 #define GDBPORT_SERIAL_LCR      __SYSREG(SERIAL_PORT1_BASE_ADDRESS + UART_LCR * 4, u8)
  83 #define GDBPORT_SERIAL_MCR      __SYSREG(SERIAL_PORT1_BASE_ADDRESS + UART_MCR * 4, u8)
  84 #define GDBPORT_SERIAL_LSR      __SYSREG(SERIAL_PORT1_BASE_ADDRESS + UART_LSR * 4, u8)
  85 #define GDBPORT_SERIAL_MSR      __SYSREG(SERIAL_PORT1_BASE_ADDRESS + UART_MSR * 4, u8)
  86 #define GDBPORT_SERIAL_SCR      __SYSREG(SERIAL_PORT1_BASE_ADDRESS + UART_SCR * 4, u8)
  87 #define GDBPORT_SERIAL_IRQ      SERIAL_IRQ
  88 #endif
  89
  90 #ifndef __ASSEMBLY__
  91
  92 #define LSR_WAIT_FOR(STATE)                                     \
  93 do {                                                            \
  94         while (!(GDBPORT_SERIAL_LSR & UART_LSR_##STATE)) {}     \
  95 } while (0)
  96 #define FLOWCTL_WAIT_FOR(LINE)                                  \
  97 do {                                                            \
  98         while (!(GDBPORT_SERIAL_MSR & UART_MSR_##LINE)) {}      \
  99 } while (0)
 100 #define FLOWCTL_CLEAR(LINE)                     \
 101 do {                                            \
 102         GDBPORT_SERIAL_MCR &= ~UART_MCR_##LINE; \
 103 } while (0)
 104 #define FLOWCTL_SET(LINE)                       \
 105 do {                                            \
 106         GDBPORT_SERIAL_MCR |= UART_MCR_##LINE;  \
 107 } while (0)
 108 #define FLOWCTL_QUERY(LINE)     ({ GDBPORT_SERIAL_MSR & UART_MSR_##LINE; })
 109
 110 static inline void __debug_to_serial(const char *p, int n)
 111 {
 112         char ch;
 113
 114         FLOWCTL_SET(DTR);
 115
 116         for (; n > 0; n--) {
 117                 LSR_WAIT_FOR(THRE);
 118                 FLOWCTL_WAIT_FOR(CTS);
 119
 120                 ch = *p++;
 121                 if (ch == 0x0a) {
 122                         GDBPORT_SERIAL_TX = 0x0d;
 123                         LSR_WAIT_FOR(THRE);
 124                         FLOWCTL_WAIT_FOR(CTS);
 125                 }
 126                 GDBPORT_SERIAL_TX = ch;
 127         }
 128
 129         FLOWCTL_CLEAR(DTR);
 130 }
 131
 132 #endif /* !__ASSEMBLY__ */
 133
 134 #endif /* CONFIG_GDBSTUB_ON_TTYSx */
 135
 136 #endif /* _ASM_UNIT_SERIAL_H */