drivers/serial/serial_ns16550.c

   1 /*
   2  * (C) Copyright 2000
   3  * Rob Taylor, Flying Pig Systems. robt@flyingpig.com.
   4  *
   5  * SPDX-License-Identifier:     GPL-2.0+
   6  */
   7
   8 #include <common.h>
   9 #include <linux/compiler.h>
  10
  11 #include <ns16550.h>
  12 #ifdef CONFIG_NS87308
  13 #include <ns87308.h>
  14 #endif
  15
  16 #include <serial.h>
  17
  18 #ifndef CONFIG_NS16550_MIN_FUNCTIONS
  19
  20 DECLARE_GLOBAL_DATA_PTR;
  21
  22 #if !defined(CONFIG_CONS_INDEX)
  23 #elif (CONFIG_CONS_INDEX < 1) || (CONFIG_CONS_INDEX > 6)
  24 #error  "Invalid console index value."
  25 #endif
  26
  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."
  39 #endif
  40
  41 /* Note: The port number specified in the functions is 1 based.
  42  *       the array is 0 based.
  43  */
  44 static NS16550_t serial_ports[6] = {
  45 #ifdef CONFIG_SYS_NS16550_COM1
  46         (NS16550_t)CONFIG_SYS_NS16550_COM1,
  47 #else
  48         NULL,
  49 #endif
  50 #ifdef CONFIG_SYS_NS16550_COM2
  51         (NS16550_t)CONFIG_SYS_NS16550_COM2,
  52 #else
  53         NULL,
  54 #endif
  55 #ifdef CONFIG_SYS_NS16550_COM3
  56         (NS16550_t)CONFIG_SYS_NS16550_COM3,
  57 #else
  58         NULL,
  59 #endif
  60 #ifdef CONFIG_SYS_NS16550_COM4
  61         (NS16550_t)CONFIG_SYS_NS16550_COM4,
  62 #else
  63         NULL,
  64 #endif
  65 #ifdef CONFIG_SYS_NS16550_COM5
  66         (NS16550_t)CONFIG_SYS_NS16550_COM5,
  67 #else
  68         NULL,
  69 #endif
  70 #ifdef CONFIG_SYS_NS16550_COM6
  71         (NS16550_t)CONFIG_SYS_NS16550_COM6
  72 #else
  73         NULL
  74 #endif
  75 };
  76
  77 #define PORT    serial_ports[port-1]
  78
  79 /* Multi serial device functions */
  80 #define DECLARE_ESERIAL_FUNCTIONS(port) \
  81         static int  eserial##port##_init(void) \
  82         { \
  83                 int clock_divisor; \
  84                 clock_divisor = calc_divisor(serial_ports[port-1]); \
  85                 NS16550_init(serial_ports[port-1], clock_divisor); \
  86                 return 0 ; \
  87         } \
  88         static void eserial##port##_setbrg(void) \
  89         { \
  90                 serial_setbrg_dev(port); \
  91         } \
  92         static int  eserial##port##_getc(void) \
  93         { \
  94                 return serial_getc_dev(port); \
  95         } \
  96         static int  eserial##port##_tstc(void) \
  97         { \
  98                 return serial_tstc_dev(port); \
  99         } \
 100         static void eserial##port##_putc(const char c) \
 101         { \
 102                 serial_putc_dev(port, c); \
 103         } \
 104         static void eserial##port##_puts(const char *s) \
 105         { \
 106                 serial_puts_dev(port, s); \
 107         }
 108
 109 /* Serial device descriptor */
 110 #define INIT_ESERIAL_STRUCTURE(port, __name) {  \
 111         .name   = __name,                       \
 112         .start  = eserial##port##_init,         \
 113         .stop   = NULL,                         \
 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,         \
 119 }
 120
 121 static int calc_divisor (NS16550_t port)
 122 {
 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 */
 128         }
 129         port->osc_12m_sel = 0;                  /* clear if previsouly set */
 130 #endif
 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 */
 135         }
 136 #endif
 137
 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.
 143          */
 144         return (CONFIG_SYS_NS16550_CLK + (gd->baudrate * (MODE_X_DIV / 2))) /
 145                 (MODE_X_DIV * gd->baudrate);
 146 }
 147
 148 void
 149 _serial_putc(const char c,const int port)
 150 {
 151         if (c == '\n')
 152                 NS16550_putc(PORT, '\r');
 153
 154         NS16550_putc(PORT, c);
 155 }
 156
 157 void
 158 _serial_putc_raw(const char c,const int port)
 159 {
 160         NS16550_putc(PORT, c);
 161 }
 162
 163 void
 164 _serial_puts (const char *s,const int port)
 165 {
 166         while (*s) {
 167                 _serial_putc (*s++,port);
 168         }
 169 }
 170
 171
 172 int
 173 _serial_getc(const int port)
 174 {
 175         return NS16550_getc(PORT);
 176 }
 177
 178 int
 179 _serial_tstc(const int port)
 180 {
 181         return NS16550_tstc(PORT);
 182 }
 183
 184 void
 185 _serial_setbrg (const int port)
 186 {
 187         int clock_divisor;
 188
 189         clock_divisor = calc_divisor(PORT);
 190         NS16550_reinit(PORT, clock_divisor);
 191 }
 192
 193 static inline void
 194 serial_putc_dev(unsigned int dev_index,const char c)
 195 {
 196         _serial_putc(c,dev_index);
 197 }
 198
 199 static inline void
 200 serial_putc_raw_dev(unsigned int dev_index,const char c)
 201 {
 202         _serial_putc_raw(c,dev_index);
 203 }
 204
 205 static inline void
 206 serial_puts_dev(unsigned int dev_index,const char *s)
 207 {
 208         _serial_puts(s,dev_index);
 209 }
 210
 211 static inline int
 212 serial_getc_dev(unsigned int dev_index)
 213 {
 214         return _serial_getc(dev_index);
 215 }
 216
 217 static inline int
 218 serial_tstc_dev(unsigned int dev_index)
 219 {
 220         return _serial_tstc(dev_index);
 221 }
 222
 223 static inline void
 224 serial_setbrg_dev(unsigned int dev_index)
 225 {
 226         _serial_setbrg(dev_index);
 227 }
 228
 229 #if defined(CONFIG_SYS_NS16550_COM1)
 230 DECLARE_ESERIAL_FUNCTIONS(1);
 231 struct serial_device eserial1_device =
 232         INIT_ESERIAL_STRUCTURE(1, "eserial0");
 233 #endif
 234 #if defined(CONFIG_SYS_NS16550_COM2)
 235 DECLARE_ESERIAL_FUNCTIONS(2);
 236 struct serial_device eserial2_device =
 237         INIT_ESERIAL_STRUCTURE(2, "eserial1");
 238 #endif
 239 #if defined(CONFIG_SYS_NS16550_COM3)
 240 DECLARE_ESERIAL_FUNCTIONS(3);
 241 struct serial_device eserial3_device =
 242         INIT_ESERIAL_STRUCTURE(3, "eserial2");
 243 #endif
 244 #if defined(CONFIG_SYS_NS16550_COM4)
 245 DECLARE_ESERIAL_FUNCTIONS(4);
 246 struct serial_device eserial4_device =
 247         INIT_ESERIAL_STRUCTURE(4, "eserial3");
 248 #endif
 249 #if defined(CONFIG_SYS_NS16550_COM5)
 250 DECLARE_ESERIAL_FUNCTIONS(5);
 251 struct serial_device eserial5_device =
 252         INIT_ESERIAL_STRUCTURE(5, "eserial4");
 253 #endif
 254 #if defined(CONFIG_SYS_NS16550_COM6)
 255 DECLARE_ESERIAL_FUNCTIONS(6);
 256 struct serial_device eserial6_device =
 257         INIT_ESERIAL_STRUCTURE(6, "eserial5");
 258 #endif
 259
 260 __weak struct serial_device *default_serial_console(void)
 261 {
 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;
 274 #else
 275 #error "Bad CONFIG_CONS_INDEX."
 276 #endif
 277 }
 278
 279 void ns16550_serial_initialize(void)
 280 {
 281 #if defined(CONFIG_SYS_NS16550_COM1)
 282         serial_register(&eserial1_device);
 283 #endif
 284 #if defined(CONFIG_SYS_NS16550_COM2)
 285         serial_register(&eserial2_device);
 286 #endif
 287 #if defined(CONFIG_SYS_NS16550_COM3)
 288         serial_register(&eserial3_device);
 289 #endif
 290 #if defined(CONFIG_SYS_NS16550_COM4)
 291         serial_register(&eserial4_device);
 292 #endif
 293 #if defined(CONFIG_SYS_NS16550_COM5)
 294         serial_register(&eserial5_device);
 295 #endif
 296 #if defined(CONFIG_SYS_NS16550_COM6)
 297         serial_register(&eserial6_device);
 298 #endif
 299 }
 300
 301 #endif /* !CONFIG_NS16550_MIN_FUNCTIONS */