3 * Rob Taylor, Flying Pig Systems. robt@flyingpig.com.
5 * See file CREDITS for list of people who contributed to this
8 * This program is free software; you can redistribute it and/or
9 * modify it under the terms of the GNU General Public License as
10 * published by the Free Software Foundation; either version 2 of
11 * the License, or (at your option) any later version.
13 * This program is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 * GNU General Public License for more details.
18 * You should have received a copy of the GNU General Public License
19 * along with this program; if not, write to the Free Software
20 * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
25 #include <linux/compiler.h>
34 DECLARE_GLOBAL_DATA_PTR;
36 #if !defined(CONFIG_CONS_INDEX)
37 #elif (CONFIG_CONS_INDEX < 1) || (CONFIG_CONS_INDEX > 4)
38 #error "Invalid console index value."
41 #if CONFIG_CONS_INDEX == 1 && !defined(CONFIG_SYS_NS16550_COM1)
42 #error "Console port 1 defined but not configured."
43 #elif CONFIG_CONS_INDEX == 2 && !defined(CONFIG_SYS_NS16550_COM2)
44 #error "Console port 2 defined but not configured."
45 #elif CONFIG_CONS_INDEX == 3 && !defined(CONFIG_SYS_NS16550_COM3)
46 #error "Console port 3 defined but not configured."
47 #elif CONFIG_CONS_INDEX == 4 && !defined(CONFIG_SYS_NS16550_COM4)
48 #error "Console port 4 defined but not configured."
51 /* Note: The port number specified in the functions is 1 based.
52 * the array is 0 based.
54 static NS16550_t serial_ports[4] = {
55 #ifdef CONFIG_SYS_NS16550_COM1
56 (NS16550_t)CONFIG_SYS_NS16550_COM1,
60 #ifdef CONFIG_SYS_NS16550_COM2
61 (NS16550_t)CONFIG_SYS_NS16550_COM2,
65 #ifdef CONFIG_SYS_NS16550_COM3
66 (NS16550_t)CONFIG_SYS_NS16550_COM3,
70 #ifdef CONFIG_SYS_NS16550_COM4
71 (NS16550_t)CONFIG_SYS_NS16550_COM4
77 #define PORT serial_ports[port-1]
79 /* Multi serial device functions */
80 #define DECLARE_ESERIAL_FUNCTIONS(port) \
81 int eserial##port##_init (void) {\
83 clock_divisor = calc_divisor(serial_ports[port-1]); \
84 NS16550_init(serial_ports[port-1], clock_divisor); \
86 void eserial##port##_setbrg (void) {\
87 serial_setbrg_dev(port);}\
88 int eserial##port##_getc (void) {\
89 return serial_getc_dev(port);}\
90 int eserial##port##_tstc (void) {\
91 return serial_tstc_dev(port);}\
92 void eserial##port##_putc (const char c) {\
93 serial_putc_dev(port, c);}\
94 void eserial##port##_puts (const char *s) {\
95 serial_puts_dev(port, s);}
97 /* Serial device descriptor */
98 #define INIT_ESERIAL_STRUCTURE(port, __name) { \
100 .start = eserial##port##_init, \
102 .setbrg = eserial##port##_setbrg, \
103 .getc = eserial##port##_getc, \
104 .tstc = eserial##port##_tstc, \
105 .putc = eserial##port##_putc, \
106 .puts = eserial##port##_puts, \
109 static int calc_divisor (NS16550_t port)
111 #ifdef CONFIG_OMAP1510
112 /* If can't cleanly clock 115200 set div to 1 */
113 if ((CONFIG_SYS_NS16550_CLK == 12000000) && (gd->baudrate == 115200)) {
114 port->osc_12m_sel = OSC_12M_SEL; /* enable 6.5 * divisor */
115 return (1); /* return 1 for base divisor */
117 port->osc_12m_sel = 0; /* clear if previsouly set */
119 #ifdef CONFIG_OMAP1610
120 /* If can't cleanly clock 115200 set div to 1 */
121 if ((CONFIG_SYS_NS16550_CLK == 48000000) && (gd->baudrate == 115200)) {
122 return (26); /* return 26 for base divisor */
127 #define MODE_X_DIV 13
129 #define MODE_X_DIV 16
132 /* Compute divisor value. Normally, we should simply return:
133 * CONFIG_SYS_NS16550_CLK) / MODE_X_DIV / gd->baudrate
134 * but we need to round that value by adding 0.5.
135 * Rounding is especially important at high baud rates.
137 return (CONFIG_SYS_NS16550_CLK + (gd->baudrate * (MODE_X_DIV / 2))) /
138 (MODE_X_DIV * gd->baudrate);
142 _serial_putc(const char c,const int port)
145 NS16550_putc(PORT, '\r');
147 NS16550_putc(PORT, c);
151 _serial_putc_raw(const char c,const int port)
153 NS16550_putc(PORT, c);
157 _serial_puts (const char *s,const int port)
160 _serial_putc (*s++,port);
166 _serial_getc(const int port)
168 return NS16550_getc(PORT);
172 _serial_tstc(const int port)
174 return NS16550_tstc(PORT);
178 _serial_setbrg (const int port)
182 clock_divisor = calc_divisor(PORT);
183 NS16550_reinit(PORT, clock_divisor);
187 serial_putc_dev(unsigned int dev_index,const char c)
189 _serial_putc(c,dev_index);
193 serial_putc_raw_dev(unsigned int dev_index,const char c)
195 _serial_putc_raw(c,dev_index);
199 serial_puts_dev(unsigned int dev_index,const char *s)
201 _serial_puts(s,dev_index);
205 serial_getc_dev(unsigned int dev_index)
207 return _serial_getc(dev_index);
211 serial_tstc_dev(unsigned int dev_index)
213 return _serial_tstc(dev_index);
217 serial_setbrg_dev(unsigned int dev_index)
219 _serial_setbrg(dev_index);
222 DECLARE_ESERIAL_FUNCTIONS(1);
223 struct serial_device eserial1_device =
224 INIT_ESERIAL_STRUCTURE(1, "eserial0");
225 DECLARE_ESERIAL_FUNCTIONS(2);
226 struct serial_device eserial2_device =
227 INIT_ESERIAL_STRUCTURE(2, "eserial1");
228 DECLARE_ESERIAL_FUNCTIONS(3);
229 struct serial_device eserial3_device =
230 INIT_ESERIAL_STRUCTURE(3, "eserial2");
231 DECLARE_ESERIAL_FUNCTIONS(4);
232 struct serial_device eserial4_device =
233 INIT_ESERIAL_STRUCTURE(4, "eserial3");
235 __weak struct serial_device *default_serial_console(void)
237 #if CONFIG_CONS_INDEX == 1
238 return &eserial1_device;
239 #elif CONFIG_CONS_INDEX == 2
240 return &eserial2_device;
241 #elif CONFIG_CONS_INDEX == 3
242 return &eserial3_device;
243 #elif CONFIG_CONS_INDEX == 4
244 return &eserial4_device;
246 #error "Bad CONFIG_CONS_INDEX."
250 void ns16550_serial_initialize(void)
252 #if defined(CONFIG_SYS_NS16550_COM1)
253 serial_register(&eserial1_device);
255 #if defined(CONFIG_SYS_NS16550_COM2)
256 serial_register(&eserial2_device);
258 #if defined(CONFIG_SYS_NS16550_COM3)
259 serial_register(&eserial3_device);
261 #if defined(CONFIG_SYS_NS16550_COM4)
262 serial_register(&eserial4_device);