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 <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 * The ASB2303 has an 18.432 MHz clock the UART
26 */
27 #define BASE_BAUD (18432000 / 16)
28
29 /*
30 * dispose of the /dev/ttyS0 and /dev/ttyS1 serial ports
31 */
32 #ifndef CONFIG_GDBSTUB_ON_TTYSx
33
34 #define SERIAL_PORT_DFNS \
35 { \
36 .baud_base = BASE_BAUD, \
37 .irq = SERIAL_IRQ, \
38 .flags = STD_COM_FLAGS, \
39 .iomem_base = (u8 *) SERIAL_PORT0_BASE_ADDRESS, \
40 .iomem_reg_shift = 2, \
41 .io_type = SERIAL_IO_MEM, \
42 }, \
43 { \
44 .baud_base = BASE_BAUD, \
45 .irq = SERIAL_IRQ, \
46 .flags = STD_COM_FLAGS, \
47 .iomem_base = (u8 *) SERIAL_PORT1_BASE_ADDRESS, \
48 .iomem_reg_shift = 2, \
49 .io_type = SERIAL_IO_MEM, \
50 },
51
52 #ifndef __ASSEMBLY__
53
__debug_to_serial(const char * p,int n)54 static inline void __debug_to_serial(const char *p, int n)
55 {
56 }
57
58 #endif /* !__ASSEMBLY__ */
59
60 #else /* CONFIG_GDBSTUB_ON_TTYSx */
61
62 #define SERIAL_PORT_DFNS /* both stolen by gdb-stub because they share an IRQ */
63
64 #if defined(CONFIG_GDBSTUB_ON_TTYS0)
65 #define GDBPORT_SERIAL_RX __SYSREG(SERIAL_PORT0_BASE_ADDRESS + UART_RX * 4, u8)
66 #define GDBPORT_SERIAL_TX __SYSREG(SERIAL_PORT0_BASE_ADDRESS + UART_TX * 4, u8)
67 #define GDBPORT_SERIAL_DLL __SYSREG(SERIAL_PORT0_BASE_ADDRESS + UART_DLL * 4, u8)
68 #define GDBPORT_SERIAL_DLM __SYSREG(SERIAL_PORT0_BASE_ADDRESS + UART_DLM * 4, u8)
69 #define GDBPORT_SERIAL_IER __SYSREG(SERIAL_PORT0_BASE_ADDRESS + UART_IER * 4, u8)
70 #define GDBPORT_SERIAL_IIR __SYSREG(SERIAL_PORT0_BASE_ADDRESS + UART_IIR * 4, u8)
71 #define GDBPORT_SERIAL_FCR __SYSREG(SERIAL_PORT0_BASE_ADDRESS + UART_FCR * 4, u8)
72 #define GDBPORT_SERIAL_LCR __SYSREG(SERIAL_PORT0_BASE_ADDRESS + UART_LCR * 4, u8)
73 #define GDBPORT_SERIAL_MCR __SYSREG(SERIAL_PORT0_BASE_ADDRESS + UART_MCR * 4, u8)
74 #define GDBPORT_SERIAL_LSR __SYSREG(SERIAL_PORT0_BASE_ADDRESS + UART_LSR * 4, u8)
75 #define GDBPORT_SERIAL_MSR __SYSREG(SERIAL_PORT0_BASE_ADDRESS + UART_MSR * 4, u8)
76 #define GDBPORT_SERIAL_SCR __SYSREG(SERIAL_PORT0_BASE_ADDRESS + UART_SCR * 4, u8)
77 #define GDBPORT_SERIAL_IRQ SERIAL_IRQ
78
79 #elif defined(CONFIG_GDBSTUB_ON_TTYS1)
80 #define GDBPORT_SERIAL_RX __SYSREG(SERIAL_PORT1_BASE_ADDRESS + UART_RX * 4, u8)
81 #define GDBPORT_SERIAL_TX __SYSREG(SERIAL_PORT1_BASE_ADDRESS + UART_TX * 4, u8)
82 #define GDBPORT_SERIAL_DLL __SYSREG(SERIAL_PORT1_BASE_ADDRESS + UART_DLL * 4, u8)
83 #define GDBPORT_SERIAL_DLM __SYSREG(SERIAL_PORT1_BASE_ADDRESS + UART_DLM * 4, u8)
84 #define GDBPORT_SERIAL_IER __SYSREG(SERIAL_PORT1_BASE_ADDRESS + UART_IER * 4, u8)
85 #define GDBPORT_SERIAL_IIR __SYSREG(SERIAL_PORT1_BASE_ADDRESS + UART_IIR * 4, u8)
86 #define GDBPORT_SERIAL_FCR __SYSREG(SERIAL_PORT1_BASE_ADDRESS + UART_FCR * 4, u8)
87 #define GDBPORT_SERIAL_LCR __SYSREG(SERIAL_PORT1_BASE_ADDRESS + UART_LCR * 4, u8)
88 #define GDBPORT_SERIAL_MCR __SYSREG(SERIAL_PORT1_BASE_ADDRESS + UART_MCR * 4, u8)
89 #define GDBPORT_SERIAL_LSR __SYSREG(SERIAL_PORT1_BASE_ADDRESS + UART_LSR * 4, u8)
90 #define GDBPORT_SERIAL_MSR __SYSREG(SERIAL_PORT1_BASE_ADDRESS + UART_MSR * 4, u8)
91 #define GDBPORT_SERIAL_SCR __SYSREG(SERIAL_PORT1_BASE_ADDRESS + UART_SCR * 4, u8)
92 #define GDBPORT_SERIAL_IRQ SERIAL_IRQ
93 #endif
94
95 #ifndef __ASSEMBLY__
96
97 #define LSR_WAIT_FOR(STATE) \
98 do { \
99 while (!(GDBPORT_SERIAL_LSR & UART_LSR_##STATE)) {} \
100 } while (0)
101 #define FLOWCTL_WAIT_FOR(LINE) \
102 do { \
103 while (!(GDBPORT_SERIAL_MSR & UART_MSR_##LINE)) {} \
104 } while (0)
105 #define FLOWCTL_CLEAR(LINE) \
106 do { \
107 GDBPORT_SERIAL_MCR &= ~UART_MCR_##LINE; \
108 } while (0)
109 #define FLOWCTL_SET(LINE) \
110 do { \
111 GDBPORT_SERIAL_MCR |= UART_MCR_##LINE; \
112 } while (0)
113 #define FLOWCTL_QUERY(LINE) ({ GDBPORT_SERIAL_MSR & UART_MSR_##LINE; })
114
__debug_to_serial(const char * p,int n)115 static inline void __debug_to_serial(const char *p, int n)
116 {
117 char ch;
118
119 FLOWCTL_SET(DTR);
120
121 for (; n > 0; n--) {
122 LSR_WAIT_FOR(THRE);
123 FLOWCTL_WAIT_FOR(CTS);
124
125 ch = *p++;
126 if (ch == 0x0a) {
127 GDBPORT_SERIAL_TX = 0x0d;
128 LSR_WAIT_FOR(THRE);
129 FLOWCTL_WAIT_FOR(CTS);
130 }
131 GDBPORT_SERIAL_TX = ch;
132 }
133
134 FLOWCTL_CLEAR(DTR);
135 }
136
137 #endif /* !__ASSEMBLY__ */
138
139 #endif /* CONFIG_GDBSTUB_ON_TTYSx */
140
141 #endif /* _ASM_UNIT_SERIAL_H */
142