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[people/ms/u-boot.git] / board / cogent / serial.c
1 /*
2 * Simple serial driver for Cogent motherboard serial ports
3 * for use during boot
4 */
5
6 #include <common.h>
7 #include <board/cogent/serial.h>
8
9 #if (CMA_MB_CAPS & CMA_MB_CAP_SERPAR)
10
11 #if (defined(CONFIG_8xx) && defined(CONFIG_8xx_CONS_NONE)) || \
12 (defined(CONFIG_8260) && defined(CONFIG_CONS_NONE))
13
14 #if CONFIG_CONS_INDEX == 1
15 #define CMA_MB_SERIAL_BASE CMA_MB_SERIALA_BASE
16 #elif CONFIG_CONS_INDEX == 2
17 #define CMA_MB_SERIAL_BASE CMA_MB_SERIALB_BASE
18 #elif CONFIG_CONS_INDEX == 3 && (CMA_MB_CAPS & CMA_MB_CAP_SER2)
19 #define CMA_MB_SERIAL_BASE CMA_MB_SER2A_BASE
20 #elif CONFIG_CONS_INDEX == 4 && (CMA_MB_CAPS & CMA_MB_CAP_SER2)
21 #define CMA_MB_SERIAL_BASE CMA_MB_SER2B_BASE
22 #else
23 #error CONFIG_CONS_INDEX must be configured for Cogent motherboard serial
24 #endif
25
26 int serial_init (void)
27 {
28 /* DECLARE_GLOBAL_DATA_PTR; */
29
30 cma_mb_serial *mbsp = (cma_mb_serial *)CMA_MB_SERIAL_BASE;
31
32 cma_mb_reg_write(&mbsp->ser_ier, 0x00); /* turn off interrupts */
33 serial_setbrg ();
34 cma_mb_reg_write(&mbsp->ser_lcr, 0x03); /* 8 data, 1 stop, no parity */
35 cma_mb_reg_write(&mbsp->ser_mcr, 0x03); /* RTS/DTR */
36 cma_mb_reg_write(&mbsp->ser_fcr, 0x07); /* Clear & enable FIFOs */
37
38 return (0);
39 }
40
41 void
42 serial_setbrg (void)
43 {
44 DECLARE_GLOBAL_DATA_PTR;
45
46 cma_mb_serial *mbsp = (cma_mb_serial *)CMA_MB_SERIAL_BASE;
47 unsigned int divisor;
48 unsigned char lcr;
49
50 if ((divisor = br_to_div(gd->baudrate)) == 0)
51 divisor = DEFDIV;
52
53 lcr = cma_mb_reg_read(&mbsp->ser_lcr);
54 cma_mb_reg_write(&mbsp->ser_lcr, lcr|0x80);/* Access baud rate(set DLAB)*/
55 cma_mb_reg_write(&mbsp->ser_brl, divisor & 0xff);
56 cma_mb_reg_write(&mbsp->ser_brh, (divisor >> 8) & 0xff);
57 cma_mb_reg_write(&mbsp->ser_lcr, lcr); /* unset DLAB */
58 }
59
60 void
61 serial_putc(const char c)
62 {
63 cma_mb_serial *mbsp = (cma_mb_serial *)CMA_MB_SERIAL_BASE;
64
65 if (c == '\n')
66 serial_putc('\r');
67
68 while ((cma_mb_reg_read(&mbsp->ser_lsr) & LSR_THRE) == 0)
69 ;
70
71 cma_mb_reg_write(&mbsp->ser_thr, c);
72 }
73
74 void
75 serial_puts(const char *s)
76 {
77 while (*s != '\0')
78 serial_putc(*s++);
79 }
80
81 int
82 serial_getc(void)
83 {
84 cma_mb_serial *mbsp = (cma_mb_serial *)CMA_MB_SERIAL_BASE;
85
86 while ((cma_mb_reg_read(&mbsp->ser_lsr) & LSR_DR) == 0)
87 ;
88
89 return ((int)cma_mb_reg_read(&mbsp->ser_rhr) & 0x7f);
90 }
91
92 int
93 serial_tstc(void)
94 {
95 cma_mb_serial *mbsp = (cma_mb_serial *)CMA_MB_SERIAL_BASE;
96
97 return ((cma_mb_reg_read(&mbsp->ser_lsr) & LSR_DR) != 0);
98 }
99
100 #endif /* CONS_NONE */
101
102 #if (CONFIG_COMMANDS & CFG_CMD_KGDB) && \
103 defined(CONFIG_KGDB_NONE)
104
105 #if CONFIG_KGDB_INDEX == CONFIG_CONS_INDEX
106 #error Console and kgdb are on the same serial port - this is not supported
107 #endif
108
109 #if CONFIG_KGDB_INDEX == 1
110 #define CMA_MB_KGDB_SER_BASE CMA_MB_SERIALA_BASE
111 #elif CONFIG_KGDB_INDEX == 2
112 #define CMA_MB_KGDB_SER_BASE CMA_MB_SERIALB_BASE
113 #elif CONFIG_KGDB_INDEX == 3 && (CMA_MB_CAPS & CMA_MB_CAP_SER2)
114 #define CMA_MB_KGDB_SER_BASE CMA_MB_SER2A_BASE
115 #elif CONFIG_KGDB_INDEX == 4 && (CMA_MB_CAPS & CMA_MB_CAP_SER2)
116 #define CMA_MB_KGDB_SER_BASE CMA_MB_SER2B_BASE
117 #else
118 #error CONFIG_KGDB_INDEX must be configured for Cogent motherboard serial
119 #endif
120
121 void
122 kgdb_serial_init(void)
123 {
124 cma_mb_serial *mbsp = (cma_mb_serial *)CMA_MB_KGDB_SER_BASE;
125 unsigned int divisor;
126
127 if ((divisor = br_to_div(CONFIG_KGDB_BAUDRATE)) == 0)
128 divisor = DEFDIV;
129
130 cma_mb_reg_write(&mbsp->ser_ier, 0x00); /* turn off interrupts */
131 cma_mb_reg_write(&mbsp->ser_lcr, 0x80); /* Access baud rate(set DLAB)*/
132 cma_mb_reg_write(&mbsp->ser_brl, divisor & 0xff);
133 cma_mb_reg_write(&mbsp->ser_brh, (divisor >> 8) & 0xff);
134 cma_mb_reg_write(&mbsp->ser_lcr, 0x03); /* 8 data, 1 stop, no parity */
135 cma_mb_reg_write(&mbsp->ser_mcr, 0x03); /* RTS/DTR */
136 cma_mb_reg_write(&mbsp->ser_fcr, 0x07); /* Clear & enable FIFOs */
137
138 printf("[on cma10x serial port B] ");
139 }
140
141 void
142 putDebugChar(int c)
143 {
144 cma_mb_serial *mbsp = (cma_mb_serial *)CMA_MB_KGDB_SER_BASE;
145
146 while ((cma_mb_reg_read(&mbsp->ser_lsr) & LSR_THRE) == 0)
147 ;
148
149 cma_mb_reg_write(&mbsp->ser_thr, c & 0xff);
150 }
151
152 void
153 putDebugStr(const char *str)
154 {
155 while (*str != '\0') {
156 if (*str == '\n')
157 putDebugChar('\r');
158 putDebugChar(*str++);
159 }
160 }
161
162 int
163 getDebugChar(void)
164 {
165 cma_mb_serial *mbsp = (cma_mb_serial *)CMA_MB_KGDB_SER_BASE;
166
167 while ((cma_mb_reg_read(&mbsp->ser_lsr) & LSR_DR) == 0)
168 ;
169
170 return ((int)cma_mb_reg_read(&mbsp->ser_rhr) & 0x7f);
171 }
172
173 void
174 kgdb_interruptible(int yes)
175 {
176 cma_mb_serial *mbsp = (cma_mb_serial *)CMA_MB_KGDB_SER_BASE;
177
178 if (yes == 1) {
179 printf("kgdb: turning serial ints on\n");
180 cma_mb_reg_write(&mbsp->ser_ier, 0xf);
181 }
182 else {
183 printf("kgdb: turning serial ints off\n");
184 cma_mb_reg_write(&mbsp->ser_ier, 0x0);
185 }
186 }
187
188 #endif /* KGDB && KGDB_NONE */
189
190 #endif /* CAPS & SERPAR */