MN10300: And Panasonic AM34 subarch and implement SMP
[linux-3.10.git] / 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 */