include/serial.h

   1 #ifndef __SERIAL_H__
   2 #define __SERIAL_H__
   3
   4 #include <post.h>
   5
   6 struct serial_device {
   7         /* enough bytes to match alignment of following func pointer */
   8         char    name[16];
   9
  10         int     (*start)(void);
  11         int     (*stop)(void);
  12         void    (*setbrg)(void);
  13         int     (*getc)(void);
  14         int     (*tstc)(void);
  15         void    (*putc)(const char c);
  16         void    (*puts)(const char *s);
  17 #if CONFIG_POST & CONFIG_SYS_POST_UART
  18         void    (*loop)(int);
  19 #endif
  20         struct serial_device    *next;
  21 };
  22
  23 void default_serial_puts(const char *s);
  24
  25 extern struct serial_device serial_smc_device;
  26 extern struct serial_device serial_scc_device;
  27 extern struct serial_device *default_serial_console(void);
  28
  29 #if     defined(CONFIG_MPC83xx) || defined(CONFIG_MPC85xx) || \
  30         defined(CONFIG_MPC86xx) || \
  31         defined(CONFIG_ARCH_TEGRA) || defined(CONFIG_SYS_COREBOOT) || \
  32         defined(CONFIG_MICROBLAZE)
  33 extern struct serial_device serial0_device;
  34 extern struct serial_device serial1_device;
  35 #endif
  36
  37 extern struct serial_device eserial1_device;
  38 extern struct serial_device eserial2_device;
  39 extern struct serial_device eserial3_device;
  40 extern struct serial_device eserial4_device;
  41 extern struct serial_device eserial5_device;
  42 extern struct serial_device eserial6_device;
  43
  44 extern void serial_register(struct serial_device *);
  45 extern void serial_initialize(void);
  46 extern void serial_stdio_init(void);
  47 extern int serial_assign(const char *name);
  48 extern void serial_reinit_all(void);
  49
  50 /* For usbtty */
  51 #ifdef CONFIG_USB_TTY
  52
  53 struct stdio_dev;
  54
  55 int usbtty_getc(struct stdio_dev *dev);
  56 void usbtty_putc(struct stdio_dev *dev, const char c);
  57 void usbtty_puts(struct stdio_dev *dev, const char *str);
  58 int usbtty_tstc(struct stdio_dev *dev);
  59
  60 #else
  61
  62 /* stubs */
  63 #define usbtty_getc(dev) 0
  64 #define usbtty_putc(dev, a)
  65 #define usbtty_puts(dev, a)
  66 #define usbtty_tstc(dev) 0
  67
  68 #endif /* CONFIG_USB_TTY */
  69
  70 struct udevice;
  71
  72 enum serial_par {
  73         SERIAL_PAR_NONE,
  74         SERIAL_PAR_ODD,
  75         SERIAL_PAR_EVEN
  76 };
  77
  78 #define SERIAL_PAR_SHIFT        0
  79 #define SERIAL_PAR_MASK         (0x03 << SERIAL_PAR_SHIFT)
  80 #define SERIAL_SET_PARITY(parity) \
  81         ((parity << SERIAL_PAR_SHIFT) & SERIAL_PAR_MASK)
  82 #define SERIAL_GET_PARITY(config) \
  83         ((config & SERIAL_PAR_MASK) >> SERIAL_PAR_SHIFT)
  84
  85 enum serial_bits {
  86         SERIAL_5_BITS,
  87         SERIAL_6_BITS,
  88         SERIAL_7_BITS,
  89         SERIAL_8_BITS
  90 };
  91
  92 #define SERIAL_BITS_SHIFT       2
  93 #define SERIAL_BITS_MASK        (0x3 << SERIAL_BITS_SHIFT)
  94 #define SERIAL_SET_BITS(bits) \
  95         ((bits << SERIAL_BITS_SHIFT) & SERIAL_BITS_MASK)
  96 #define SERIAL_GET_BITS(config) \
  97         ((config & SERIAL_BITS_MASK) >> SERIAL_BITS_SHIFT)
  98
  99 enum serial_stop {
 100         SERIAL_HALF_STOP,       /* 0.5 stop bit */
 101         SERIAL_ONE_STOP,        /*   1 stop bit */
 102         SERIAL_ONE_HALF_STOP,   /* 1.5 stop bit */
 103         SERIAL_TWO_STOP         /*   2 stop bit */
 104 };
 105
 106 #define SERIAL_STOP_SHIFT       4
 107 #define SERIAL_STOP_MASK        (0x3 << SERIAL_STOP_SHIFT)
 108 #define SERIAL_SET_STOP(stop) \
 109         ((stop << SERIAL_STOP_SHIFT) & SERIAL_STOP_MASK)
 110 #define SERIAL_GET_STOP(config) \
 111         ((config & SERIAL_STOP_MASK) >> SERIAL_STOP_SHIFT)
 112
 113 #define SERIAL_CONFIG(par, bits, stop) \
 114                      (par << SERIAL_PAR_SHIFT | \
 115                       bits << SERIAL_BITS_SHIFT | \
 116                       stop << SERIAL_STOP_SHIFT)
 117
 118 #define SERIAL_DEFAULT_CONFIG \
 119                         (SERIAL_PAR_NONE << SERIAL_PAR_SHIFT | \
 120                          SERIAL_8_BITS << SERIAL_BITS_SHIFT | \
 121                          SERIAL_ONE_STOP << SERIAL_STOP_SHIFT)
 122
 123 enum serial_chip_type {
 124         SERIAL_CHIP_UNKNOWN = -1,
 125         SERIAL_CHIP_16550_COMPATIBLE,
 126 };
 127
 128 enum adr_space_type {
 129         SERIAL_ADDRESS_SPACE_MEMORY = 0,
 130         SERIAL_ADDRESS_SPACE_IO,
 131 };
 132
 133 /**
 134  * struct serial_device_info - structure to hold serial device info
 135  *
 136  * @type:       type of the UART chip
 137  * @addr_space: address space to access the registers
 138  * @addr:       physical address of the registers
 139  * @reg_width:  size (in bytes) of the IO accesses to the registers
 140  * @reg_offset: offset to apply to the @addr from the start of the registers
 141  * @reg_shift:  quantity to shift the register offsets by
 142  * @clock:      UART base clock speed in Hz
 143  * @baudrate:   baud rate
 144  */
 145 struct serial_device_info {
 146         enum serial_chip_type type;
 147         enum adr_space_type addr_space;
 148         ulong addr;
 149         u8 reg_width;
 150         u8 reg_offset;
 151         u8 reg_shift;
 152         unsigned int clock;
 153         unsigned int baudrate;
 154 };
 155
 156 #define SERIAL_DEFAULT_ADDRESS  0xBADACCE5
 157 #define SERIAL_DEFAULT_CLOCK    (16 * 115200)
 158
 159 /**
 160  * struct struct dm_serial_ops - Driver model serial operations
 161  *
 162  * The uclass interface is implemented by all serial devices which use
 163  * driver model.
 164  */
 165 struct dm_serial_ops {
 166         /**
 167          * setbrg() - Set up the baud rate generator
 168          *
 169          * Adjust baud rate divisors to set up a new baud rate for this
 170          * device. Not all devices will support all rates. If the rate
 171          * cannot be supported, the driver is free to select the nearest
 172          * available rate. or return -EINVAL if this is not possible.
 173          *
 174          * @dev: Device pointer
 175          * @baudrate: New baud rate to use
 176          * @return 0 if OK, -ve on error
 177          */
 178         int (*setbrg)(struct udevice *dev, int baudrate);
 179         /**
 180          * getc() - Read a character and return it
 181          *
 182          * If no character is available, this should return -EAGAIN without
 183          * waiting.
 184          *
 185          * @dev: Device pointer
 186          * @return character (0..255), -ve on error
 187          */
 188         int (*getc)(struct udevice *dev);
 189         /**
 190          * putc() - Write a character
 191          *
 192          * @dev: Device pointer
 193          * @ch: character to write
 194          * @return 0 if OK, -ve on error
 195          */
 196         int (*putc)(struct udevice *dev, const char ch);
 197         /**
 198          * pending() - Check if input/output characters are waiting
 199          *
 200          * This can be used to return an indication of the number of waiting
 201          * characters if the driver knows this (e.g. by looking at the FIFO
 202          * level). It is acceptable to return 1 if an indeterminant number
 203          * of characters is waiting.
 204          *
 205          * This method is optional.
 206          *
 207          * @dev: Device pointer
 208          * @input: true to check input characters, false for output
 209          * @return number of waiting characters, 0 for none, -ve on error
 210          */
 211         int (*pending)(struct udevice *dev, bool input);
 212         /**
 213          * clear() - Clear the serial FIFOs/holding registers
 214          *
 215          * This method is optional.
 216          *
 217          * This quickly clears any input/output characters from the UART.
 218          * If this is not possible, but characters still exist, then it
 219          * is acceptable to return -EAGAIN (try again) or -EINVAL (not
 220          * supported).
 221          *
 222          * @dev: Device pointer
 223          * @return 0 if OK, -ve on error
 224          */
 225         int (*clear)(struct udevice *dev);
 226 #if CONFIG_POST & CONFIG_SYS_POST_UART
 227         /**
 228          * loop() - Control serial device loopback mode
 229          *
 230          * @dev: Device pointer
 231          * @on: 1 to turn loopback on, 0 to turn if off
 232          */
 233         int (*loop)(struct udevice *dev, int on);
 234 #endif
 235
 236         /**
 237          * getconfig() - Get the uart configuration
 238          * (parity, 5/6/7/8 bits word length, stop bits)
 239          *
 240          * Get a current config for this device.
 241          *
 242          * @dev: Device pointer
 243          * @serial_config: Returns config information (see SERIAL_... above)
 244          * @return 0 if OK, -ve on error
 245          */
 246         int (*getconfig)(struct udevice *dev, uint *serial_config);
 247         /**
 248          * setconfig() - Set up the uart configuration
 249          * (parity, 5/6/7/8 bits word length, stop bits)
 250          *
 251          * Set up a new config for this device.
 252          *
 253          * @dev: Device pointer
 254          * @serial_config: number of bits, parity and number of stopbits to use
 255          * @return 0 if OK, -ve on error
 256          */
 257         int (*setconfig)(struct udevice *dev, uint serial_config);
 258         /**
 259          * getinfo() - Get serial device information
 260          *
 261          * @dev: Device pointer
 262          * @info: struct serial_device_info to fill
 263          * @return 0 if OK, -ve on error
 264          */
 265         int (*getinfo)(struct udevice *dev, struct serial_device_info *info);
 266 };
 267
 268 /**
 269  * struct serial_dev_priv - information about a device used by the uclass
 270  *
 271  * @sdev:       stdio device attached to this uart
 272  *
 273  * @buf:        Pointer to the RX buffer
 274  * @rd_ptr:     Read pointer in the RX buffer
 275  * @wr_ptr:     Write pointer in the RX buffer
 276  */
 277 struct serial_dev_priv {
 278         struct stdio_dev *sdev;
 279
 280         char *buf;
 281         int rd_ptr;
 282         int wr_ptr;
 283 };
 284
 285 /* Access the serial operations for a device */
 286 #define serial_get_ops(dev)     ((struct dm_serial_ops *)(dev)->driver->ops)
 287
 288 /**
 289  * serial_getconfig() - Get the uart configuration
 290  * (parity, 5/6/7/8 bits word length, stop bits)
 291  *
 292  * Get a current config for this device.
 293  *
 294  * @dev: Device pointer
 295  * @serial_config: Returns config information (see SERIAL_... above)
 296  * @return 0 if OK, -ve on error
 297  */
 298 int serial_getconfig(struct udevice *dev, uint *config);
 299
 300 /**
 301  * serial_setconfig() - Set up the uart configuration
 302  * (parity, 5/6/7/8 bits word length, stop bits)
 303  *
 304  * Set up a new config for this device.
 305  *
 306  * @dev: Device pointer
 307  * @serial_config: number of bits, parity and number of stopbits to use
 308  * @return 0 if OK, -ve on error
 309  */
 310 int serial_setconfig(struct udevice *dev, uint config);
 311
 312 /**
 313  * serial_getinfo() - Get serial device information
 314  *
 315  * @dev: Device pointer
 316  * @info: struct serial_device_info to fill
 317  * @return 0 if OK, -ve on error
 318  */
 319 int serial_getinfo(struct udevice *dev, struct serial_device_info *info);
 320
 321 void atmel_serial_initialize(void);
 322 void mcf_serial_initialize(void);
 323 void mpc85xx_serial_initialize(void);
 324 void mxc_serial_initialize(void);
 325 void ns16550_serial_initialize(void);
 326 void pl01x_serial_initialize(void);
 327 void pxa_serial_initialize(void);
 328 void sh_serial_initialize(void);
 329
 330 /**
 331  * serial_printf() - Write a formatted string to the serial console
 332  *
 333  * The total size of the output must be less than CONFIG_SYS_PBSIZE.
 334  *
 335  * @fmt: Printf format string, followed by format arguments
 336  * @return number of characters written
 337  */
 338 int serial_printf(const char *fmt, ...)
 339                 __attribute__ ((format (__printf__, 1, 2)));
 340
 341 int serial_init(void);
 342 void serial_setbrg(void);
 343 void serial_putc(const char ch);
 344 void serial_putc_raw(const char ch);
 345 void serial_puts(const char *str);
 346 int serial_getc(void);
 347 int serial_tstc(void);
 348
 349 #endif