3 * Rob Taylor, Flying Pig Systems. robt@flyingpig.com.
5 * SPDX-License-Identifier: GPL-2.0+
9 #include <linux/compiler.h>
18 #ifndef CONFIG_NS16550_MIN_FUNCTIONS
20 DECLARE_GLOBAL_DATA_PTR;
22 #if !defined(CONFIG_CONS_INDEX)
23 #elif (CONFIG_CONS_INDEX < 1) || (CONFIG_CONS_INDEX > 6)
24 #error "Invalid console index value."
27 #if CONFIG_CONS_INDEX == 1 && !defined(CONFIG_SYS_NS16550_COM1)
28 #error "Console port 1 defined but not configured."
29 #elif CONFIG_CONS_INDEX == 2 && !defined(CONFIG_SYS_NS16550_COM2)
30 #error "Console port 2 defined but not configured."
31 #elif CONFIG_CONS_INDEX == 3 && !defined(CONFIG_SYS_NS16550_COM3)
32 #error "Console port 3 defined but not configured."
33 #elif CONFIG_CONS_INDEX == 4 && !defined(CONFIG_SYS_NS16550_COM4)
34 #error "Console port 4 defined but not configured."
35 #elif CONFIG_CONS_INDEX == 5 && !defined(CONFIG_SYS_NS16550_COM5)
36 #error "Console port 5 defined but not configured."
37 #elif CONFIG_CONS_INDEX == 6 && !defined(CONFIG_SYS_NS16550_COM6)
38 #error "Console port 6 defined but not configured."
41 /* Note: The port number specified in the functions is 1 based.
42 * the array is 0 based.
44 static NS16550_t serial_ports[6] = {
45 #ifdef CONFIG_SYS_NS16550_COM1
46 (NS16550_t)CONFIG_SYS_NS16550_COM1,
50 #ifdef CONFIG_SYS_NS16550_COM2
51 (NS16550_t)CONFIG_SYS_NS16550_COM2,
55 #ifdef CONFIG_SYS_NS16550_COM3
56 (NS16550_t)CONFIG_SYS_NS16550_COM3,
60 #ifdef CONFIG_SYS_NS16550_COM4
61 (NS16550_t)CONFIG_SYS_NS16550_COM4,
65 #ifdef CONFIG_SYS_NS16550_COM5
66 (NS16550_t)CONFIG_SYS_NS16550_COM5,
70 #ifdef CONFIG_SYS_NS16550_COM6
71 (NS16550_t)CONFIG_SYS_NS16550_COM6
77 #define PORT serial_ports[port-1]
79 /* Multi serial device functions */
80 #define DECLARE_ESERIAL_FUNCTIONS(port) \
81 static int eserial##port##_init(void) \
84 clock_divisor = calc_divisor(serial_ports[port-1]); \
85 NS16550_init(serial_ports[port-1], clock_divisor); \
88 static void eserial##port##_setbrg(void) \
90 serial_setbrg_dev(port); \
92 static int eserial##port##_getc(void) \
94 return serial_getc_dev(port); \
96 static int eserial##port##_tstc(void) \
98 return serial_tstc_dev(port); \
100 static void eserial##port##_putc(const char c) \
102 serial_putc_dev(port, c); \
104 static void eserial##port##_puts(const char *s) \
106 serial_puts_dev(port, s); \
109 /* Serial device descriptor */
110 #define INIT_ESERIAL_STRUCTURE(port, __name) { \
112 .start = eserial##port##_init, \
114 .setbrg = eserial##port##_setbrg, \
115 .getc = eserial##port##_getc, \
116 .tstc = eserial##port##_tstc, \
117 .putc = eserial##port##_putc, \
118 .puts = eserial##port##_puts, \
121 static int calc_divisor (NS16550_t port)
123 #ifdef CONFIG_OMAP1510
124 /* If can't cleanly clock 115200 set div to 1 */
125 if ((CONFIG_SYS_NS16550_CLK == 12000000) && (gd->baudrate == 115200)) {
126 port->osc_12m_sel = OSC_12M_SEL; /* enable 6.5 * divisor */
127 return (1); /* return 1 for base divisor */
129 port->osc_12m_sel = 0; /* clear if previsouly set */
131 #ifdef CONFIG_OMAP1610
132 /* If can't cleanly clock 115200 set div to 1 */
133 if ((CONFIG_SYS_NS16550_CLK == 48000000) && (gd->baudrate == 115200)) {
134 return (26); /* return 26 for base divisor */
138 #define MODE_X_DIV 16
139 /* Compute divisor value. Normally, we should simply return:
140 * CONFIG_SYS_NS16550_CLK) / MODE_X_DIV / gd->baudrate
141 * but we need to round that value by adding 0.5.
142 * Rounding is especially important at high baud rates.
144 return (CONFIG_SYS_NS16550_CLK + (gd->baudrate * (MODE_X_DIV / 2))) /
145 (MODE_X_DIV * gd->baudrate);
149 _serial_putc(const char c,const int port)
152 NS16550_putc(PORT, '\r');
154 NS16550_putc(PORT, c);
158 _serial_putc_raw(const char c,const int port)
160 NS16550_putc(PORT, c);
164 _serial_puts (const char *s,const int port)
167 _serial_putc (*s++,port);
173 _serial_getc(const int port)
175 return NS16550_getc(PORT);
179 _serial_tstc(const int port)
181 return NS16550_tstc(PORT);
185 _serial_setbrg (const int port)
189 clock_divisor = calc_divisor(PORT);
190 NS16550_reinit(PORT, clock_divisor);
194 serial_putc_dev(unsigned int dev_index,const char c)
196 _serial_putc(c,dev_index);
200 serial_putc_raw_dev(unsigned int dev_index,const char c)
202 _serial_putc_raw(c,dev_index);
206 serial_puts_dev(unsigned int dev_index,const char *s)
208 _serial_puts(s,dev_index);
212 serial_getc_dev(unsigned int dev_index)
214 return _serial_getc(dev_index);
218 serial_tstc_dev(unsigned int dev_index)
220 return _serial_tstc(dev_index);
224 serial_setbrg_dev(unsigned int dev_index)
226 _serial_setbrg(dev_index);
229 #if defined(CONFIG_SYS_NS16550_COM1)
230 DECLARE_ESERIAL_FUNCTIONS(1);
231 struct serial_device eserial1_device =
232 INIT_ESERIAL_STRUCTURE(1, "eserial0");
234 #if defined(CONFIG_SYS_NS16550_COM2)
235 DECLARE_ESERIAL_FUNCTIONS(2);
236 struct serial_device eserial2_device =
237 INIT_ESERIAL_STRUCTURE(2, "eserial1");
239 #if defined(CONFIG_SYS_NS16550_COM3)
240 DECLARE_ESERIAL_FUNCTIONS(3);
241 struct serial_device eserial3_device =
242 INIT_ESERIAL_STRUCTURE(3, "eserial2");
244 #if defined(CONFIG_SYS_NS16550_COM4)
245 DECLARE_ESERIAL_FUNCTIONS(4);
246 struct serial_device eserial4_device =
247 INIT_ESERIAL_STRUCTURE(4, "eserial3");
249 #if defined(CONFIG_SYS_NS16550_COM5)
250 DECLARE_ESERIAL_FUNCTIONS(5);
251 struct serial_device eserial5_device =
252 INIT_ESERIAL_STRUCTURE(5, "eserial4");
254 #if defined(CONFIG_SYS_NS16550_COM6)
255 DECLARE_ESERIAL_FUNCTIONS(6);
256 struct serial_device eserial6_device =
257 INIT_ESERIAL_STRUCTURE(6, "eserial5");
260 __weak struct serial_device *default_serial_console(void)
262 #if CONFIG_CONS_INDEX == 1
263 return &eserial1_device;
264 #elif CONFIG_CONS_INDEX == 2
265 return &eserial2_device;
266 #elif CONFIG_CONS_INDEX == 3
267 return &eserial3_device;
268 #elif CONFIG_CONS_INDEX == 4
269 return &eserial4_device;
270 #elif CONFIG_CONS_INDEX == 5
271 return &eserial5_device;
272 #elif CONFIG_CONS_INDEX == 6
273 return &eserial6_device;
275 #error "Bad CONFIG_CONS_INDEX."
279 void ns16550_serial_initialize(void)
281 #if defined(CONFIG_SYS_NS16550_COM1)
282 serial_register(&eserial1_device);
284 #if defined(CONFIG_SYS_NS16550_COM2)
285 serial_register(&eserial2_device);
287 #if defined(CONFIG_SYS_NS16550_COM3)
288 serial_register(&eserial3_device);
290 #if defined(CONFIG_SYS_NS16550_COM4)
291 serial_register(&eserial4_device);
293 #if defined(CONFIG_SYS_NS16550_COM5)
294 serial_register(&eserial5_device);
296 #if defined(CONFIG_SYS_NS16550_COM6)
297 serial_register(&eserial6_device);
301 #endif /* !CONFIG_NS16550_MIN_FUNCTIONS */