Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | /* |
| 2 | * drivers/serial/v850e_uart.c -- Serial I/O using V850E on-chip UART or UARTB |
| 3 | * |
| 4 | * Copyright (C) 2001,02,03 NEC Electronics Corporation |
| 5 | * Copyright (C) 2001,02,03 Miles Bader <miles@gnu.org> |
| 6 | * |
| 7 | * This file is subject to the terms and conditions of the GNU General |
| 8 | * Public License. See the file COPYING in the main directory of this |
| 9 | * archive for more details. |
| 10 | * |
| 11 | * Written by Miles Bader <miles@gnu.org> |
| 12 | */ |
| 13 | |
| 14 | /* This driver supports both the original V850E UART interface (called |
| 15 | merely `UART' in the docs) and the newer `UARTB' interface, which is |
| 16 | roughly a superset of the first one. The selection is made at |
| 17 | configure time -- if CONFIG_V850E_UARTB is defined, then UARTB is |
| 18 | presumed, otherwise the old UART -- as these are on-CPU UARTS, a system |
| 19 | can never have both. |
| 20 | |
| 21 | The UARTB interface also has a 16-entry FIFO mode, which is not |
| 22 | yet supported by this driver. */ |
| 23 | |
| 24 | #include <linux/kernel.h> |
| 25 | #include <linux/init.h> |
| 26 | #include <linux/module.h> |
| 27 | #include <linux/console.h> |
| 28 | #include <linux/tty.h> |
| 29 | #include <linux/tty_flip.h> |
| 30 | #include <linux/serial.h> |
| 31 | #include <linux/serial_core.h> |
| 32 | |
| 33 | #include <asm/v850e_uart.h> |
| 34 | |
| 35 | /* Initial UART state. This may be overridden by machine-dependent headers. */ |
| 36 | #ifndef V850E_UART_INIT_BAUD |
| 37 | #define V850E_UART_INIT_BAUD 115200 |
| 38 | #endif |
| 39 | #ifndef V850E_UART_INIT_CFLAGS |
| 40 | #define V850E_UART_INIT_CFLAGS (B115200 | CS8 | CREAD) |
| 41 | #endif |
| 42 | |
| 43 | /* A string used for prefixing printed descriptions; since the same UART |
| 44 | macro is actually used on other chips than the V850E. This must be a |
| 45 | constant string. */ |
| 46 | #ifndef V850E_UART_CHIP_NAME |
| 47 | #define V850E_UART_CHIP_NAME "V850E" |
| 48 | #endif |
| 49 | |
| 50 | #define V850E_UART_MINOR_BASE 64 /* First tty minor number */ |
| 51 | |
| 52 | |
| 53 | /* Low-level UART functions. */ |
| 54 | |
| 55 | /* Configure and turn on uart channel CHAN, using the termios `control |
| 56 | modes' bits in CFLAGS, and a baud-rate of BAUD. */ |
| 57 | void v850e_uart_configure (unsigned chan, unsigned cflags, unsigned baud) |
| 58 | { |
| 59 | int flags; |
| 60 | v850e_uart_speed_t old_speed; |
| 61 | v850e_uart_config_t old_config; |
| 62 | v850e_uart_speed_t new_speed = v850e_uart_calc_speed (baud); |
| 63 | v850e_uart_config_t new_config = v850e_uart_calc_config (cflags); |
| 64 | |
| 65 | /* Disable interrupts while we're twiddling the hardware. */ |
| 66 | local_irq_save (flags); |
| 67 | |
| 68 | #ifdef V850E_UART_PRE_CONFIGURE |
| 69 | V850E_UART_PRE_CONFIGURE (chan, cflags, baud); |
| 70 | #endif |
| 71 | |
| 72 | old_config = V850E_UART_CONFIG (chan); |
| 73 | old_speed = v850e_uart_speed (chan); |
| 74 | |
| 75 | if (! v850e_uart_speed_eq (old_speed, new_speed)) { |
| 76 | /* The baud rate has changed. First, disable the UART. */ |
| 77 | V850E_UART_CONFIG (chan) = V850E_UART_CONFIG_FINI; |
| 78 | old_config = 0; /* Force the uart to be re-initialized. */ |
| 79 | |
| 80 | /* Reprogram the baud-rate generator. */ |
| 81 | v850e_uart_set_speed (chan, new_speed); |
| 82 | } |
| 83 | |
| 84 | if (! (old_config & V850E_UART_CONFIG_ENABLED)) { |
| 85 | /* If we are using the uart for the first time, start by |
| 86 | enabling it, which must be done before turning on any |
| 87 | other bits. */ |
| 88 | V850E_UART_CONFIG (chan) = V850E_UART_CONFIG_INIT; |
| 89 | /* See the initial state. */ |
| 90 | old_config = V850E_UART_CONFIG (chan); |
| 91 | } |
| 92 | |
| 93 | if (new_config != old_config) { |
| 94 | /* Which of the TXE/RXE bits we'll temporarily turn off |
| 95 | before changing other control bits. */ |
| 96 | unsigned temp_disable = 0; |
| 97 | /* Which of the TXE/RXE bits will be enabled. */ |
| 98 | unsigned enable = 0; |
| 99 | unsigned changed_bits = new_config ^ old_config; |
| 100 | |
| 101 | /* Which of RX/TX will be enabled in the new configuration. */ |
| 102 | if (new_config & V850E_UART_CONFIG_RX_BITS) |
| 103 | enable |= (new_config & V850E_UART_CONFIG_RX_ENABLE); |
| 104 | if (new_config & V850E_UART_CONFIG_TX_BITS) |
| 105 | enable |= (new_config & V850E_UART_CONFIG_TX_ENABLE); |
| 106 | |
| 107 | /* Figure out which of RX/TX needs to be disabled; note |
| 108 | that this will only happen if they're not already |
| 109 | disabled. */ |
| 110 | if (changed_bits & V850E_UART_CONFIG_RX_BITS) |
| 111 | temp_disable |
| 112 | |= (old_config & V850E_UART_CONFIG_RX_ENABLE); |
| 113 | if (changed_bits & V850E_UART_CONFIG_TX_BITS) |
| 114 | temp_disable |
| 115 | |= (old_config & V850E_UART_CONFIG_TX_ENABLE); |
| 116 | |
| 117 | /* We have to turn off RX and/or TX mode before changing |
| 118 | any associated control bits. */ |
| 119 | if (temp_disable) |
| 120 | V850E_UART_CONFIG (chan) = old_config & ~temp_disable; |
| 121 | |
| 122 | /* Write the new control bits, while RX/TX are disabled. */ |
| 123 | if (changed_bits & ~enable) |
| 124 | V850E_UART_CONFIG (chan) = new_config & ~enable; |
| 125 | |
| 126 | v850e_uart_config_delay (new_config, new_speed); |
| 127 | |
| 128 | /* Write the final version, with enable bits turned on. */ |
| 129 | V850E_UART_CONFIG (chan) = new_config; |
| 130 | } |
| 131 | |
| 132 | local_irq_restore (flags); |
| 133 | } |
| 134 | |
| 135 | |
| 136 | /* Low-level console. */ |
| 137 | |
| 138 | #ifdef CONFIG_V850E_UART_CONSOLE |
| 139 | |
| 140 | static void v850e_uart_cons_write (struct console *co, |
| 141 | const char *s, unsigned count) |
| 142 | { |
| 143 | if (count > 0) { |
| 144 | unsigned chan = co->index; |
| 145 | unsigned irq = V850E_UART_TX_IRQ (chan); |
| 146 | int irq_was_enabled, irq_was_pending, flags; |
| 147 | |
| 148 | /* We don't want to get `transmission completed' |
| 149 | interrupts, since we're busy-waiting, so we disable them |
| 150 | while sending (we don't disable interrupts entirely |
| 151 | because sending over a serial line is really slow). We |
| 152 | save the status of the tx interrupt and restore it when |
| 153 | we're done so that using printk doesn't interfere with |
| 154 | normal serial transmission (other than interleaving the |
| 155 | output, of course!). This should work correctly even if |
| 156 | this function is interrupted and the interrupt printks |
| 157 | something. */ |
| 158 | |
| 159 | /* Disable interrupts while fiddling with tx interrupt. */ |
| 160 | local_irq_save (flags); |
| 161 | /* Get current tx interrupt status. */ |
| 162 | irq_was_enabled = v850e_intc_irq_enabled (irq); |
| 163 | irq_was_pending = v850e_intc_irq_pending (irq); |
| 164 | /* Disable tx interrupt if necessary. */ |
| 165 | if (irq_was_enabled) |
| 166 | v850e_intc_disable_irq (irq); |
| 167 | /* Turn interrupts back on. */ |
| 168 | local_irq_restore (flags); |
| 169 | |
| 170 | /* Send characters. */ |
| 171 | while (count > 0) { |
| 172 | int ch = *s++; |
| 173 | |
| 174 | if (ch == '\n') { |
| 175 | /* We don't have the benefit of a tty |
| 176 | driver, so translate NL into CR LF. */ |
| 177 | v850e_uart_wait_for_xmit_ok (chan); |
| 178 | v850e_uart_putc (chan, '\r'); |
| 179 | } |
| 180 | |
| 181 | v850e_uart_wait_for_xmit_ok (chan); |
| 182 | v850e_uart_putc (chan, ch); |
| 183 | |
| 184 | count--; |
| 185 | } |
| 186 | |
| 187 | /* Restore saved tx interrupt status. */ |
| 188 | if (irq_was_enabled) { |
| 189 | /* Wait for the last character we sent to be |
| 190 | completely transmitted (as we'll get an |
| 191 | interrupt interrupt at that point). */ |
| 192 | v850e_uart_wait_for_xmit_done (chan); |
| 193 | /* Clear pending interrupts received due |
| 194 | to our transmission, unless there was already |
| 195 | one pending, in which case we want the |
| 196 | handler to be called. */ |
| 197 | if (! irq_was_pending) |
| 198 | v850e_intc_clear_pending_irq (irq); |
| 199 | /* ... and then turn back on handling. */ |
| 200 | v850e_intc_enable_irq (irq); |
| 201 | } |
| 202 | } |
| 203 | } |
| 204 | |
| 205 | extern struct uart_driver v850e_uart_driver; |
| 206 | static struct console v850e_uart_cons = |
| 207 | { |
| 208 | .name = "ttyS", |
| 209 | .write = v850e_uart_cons_write, |
| 210 | .device = uart_console_device, |
| 211 | .flags = CON_PRINTBUFFER, |
| 212 | .cflag = V850E_UART_INIT_CFLAGS, |
| 213 | .index = -1, |
| 214 | .data = &v850e_uart_driver, |
| 215 | }; |
| 216 | |
| 217 | void v850e_uart_cons_init (unsigned chan) |
| 218 | { |
| 219 | v850e_uart_configure (chan, V850E_UART_INIT_CFLAGS, |
| 220 | V850E_UART_INIT_BAUD); |
| 221 | v850e_uart_cons.index = chan; |
| 222 | register_console (&v850e_uart_cons); |
| 223 | printk ("Console: %s on-chip UART channel %d\n", |
| 224 | V850E_UART_CHIP_NAME, chan); |
| 225 | } |
| 226 | |
| 227 | /* This is what the init code actually calls. */ |
| 228 | static int v850e_uart_console_init (void) |
| 229 | { |
| 230 | v850e_uart_cons_init (V850E_UART_CONSOLE_CHANNEL); |
| 231 | return 0; |
| 232 | } |
| 233 | console_initcall(v850e_uart_console_init); |
| 234 | |
| 235 | #define V850E_UART_CONSOLE &v850e_uart_cons |
| 236 | |
| 237 | #else /* !CONFIG_V850E_UART_CONSOLE */ |
| 238 | #define V850E_UART_CONSOLE 0 |
| 239 | #endif /* CONFIG_V850E_UART_CONSOLE */ |
| 240 | |
| 241 | /* TX/RX interrupt handlers. */ |
| 242 | |
Russell King | b129a8c | 2005-08-31 10:12:14 +0100 | [diff] [blame] | 243 | static void v850e_uart_stop_tx (struct uart_port *port); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 244 | |
| 245 | void v850e_uart_tx (struct uart_port *port) |
| 246 | { |
| 247 | struct circ_buf *xmit = &port->info->xmit; |
| 248 | int stopped = uart_tx_stopped (port); |
| 249 | |
| 250 | if (v850e_uart_xmit_ok (port->line)) { |
| 251 | int tx_ch; |
| 252 | |
| 253 | if (port->x_char) { |
| 254 | tx_ch = port->x_char; |
| 255 | port->x_char = 0; |
| 256 | } else if (!uart_circ_empty (xmit) && !stopped) { |
| 257 | tx_ch = xmit->buf[xmit->tail]; |
| 258 | xmit->tail = (xmit->tail + 1) & (UART_XMIT_SIZE - 1); |
| 259 | } else |
| 260 | goto no_xmit; |
| 261 | |
| 262 | v850e_uart_putc (port->line, tx_ch); |
| 263 | port->icount.tx++; |
| 264 | |
| 265 | if (uart_circ_chars_pending (xmit) < WAKEUP_CHARS) |
| 266 | uart_write_wakeup (port); |
| 267 | } |
| 268 | |
| 269 | no_xmit: |
| 270 | if (uart_circ_empty (xmit) || stopped) |
| 271 | v850e_uart_stop_tx (port, stopped); |
| 272 | } |
| 273 | |
David Howells | 7d12e78 | 2006-10-05 14:55:46 +0100 | [diff] [blame] | 274 | static irqreturn_t v850e_uart_tx_irq(int irq, void *data) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 275 | { |
| 276 | struct uart_port *port = data; |
| 277 | v850e_uart_tx (port); |
| 278 | return IRQ_HANDLED; |
| 279 | } |
| 280 | |
David Howells | 7d12e78 | 2006-10-05 14:55:46 +0100 | [diff] [blame] | 281 | static irqreturn_t v850e_uart_rx_irq(int irq, void *data) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 282 | { |
| 283 | struct uart_port *port = data; |
| 284 | unsigned ch_stat = TTY_NORMAL; |
| 285 | unsigned ch = v850e_uart_getc (port->line); |
| 286 | unsigned err = v850e_uart_err (port->line); |
| 287 | |
| 288 | if (err) { |
| 289 | if (err & V850E_UART_ERR_OVERRUN) { |
| 290 | ch_stat = TTY_OVERRUN; |
| 291 | port->icount.overrun++; |
| 292 | } else if (err & V850E_UART_ERR_FRAME) { |
| 293 | ch_stat = TTY_FRAME; |
| 294 | port->icount.frame++; |
| 295 | } else if (err & V850E_UART_ERR_PARITY) { |
| 296 | ch_stat = TTY_PARITY; |
| 297 | port->icount.parity++; |
| 298 | } |
| 299 | } |
| 300 | |
| 301 | port->icount.rx++; |
| 302 | |
| 303 | tty_insert_flip_char (port->info->tty, ch, ch_stat); |
| 304 | tty_schedule_flip (port->info->tty); |
| 305 | |
| 306 | return IRQ_HANDLED; |
| 307 | } |
| 308 | |
| 309 | |
| 310 | /* Control functions for the serial framework. */ |
| 311 | |
| 312 | static void v850e_uart_nop (struct uart_port *port) { } |
| 313 | static int v850e_uart_success (struct uart_port *port) { return 0; } |
| 314 | |
| 315 | static unsigned v850e_uart_tx_empty (struct uart_port *port) |
| 316 | { |
| 317 | return TIOCSER_TEMT; /* Can't detect. */ |
| 318 | } |
| 319 | |
| 320 | static void v850e_uart_set_mctrl (struct uart_port *port, unsigned mctrl) |
| 321 | { |
| 322 | #ifdef V850E_UART_SET_RTS |
| 323 | V850E_UART_SET_RTS (port->line, (mctrl & TIOCM_RTS)); |
| 324 | #endif |
| 325 | } |
| 326 | |
| 327 | static unsigned v850e_uart_get_mctrl (struct uart_port *port) |
| 328 | { |
| 329 | /* We don't support DCD or DSR, so consider them permanently active. */ |
| 330 | int mctrl = TIOCM_CAR | TIOCM_DSR; |
| 331 | |
| 332 | /* We may support CTS. */ |
| 333 | #ifdef V850E_UART_CTS |
| 334 | mctrl |= V850E_UART_CTS(port->line) ? TIOCM_CTS : 0; |
| 335 | #else |
| 336 | mctrl |= TIOCM_CTS; |
| 337 | #endif |
| 338 | |
| 339 | return mctrl; |
| 340 | } |
| 341 | |
Russell King | b129a8c | 2005-08-31 10:12:14 +0100 | [diff] [blame] | 342 | static void v850e_uart_start_tx (struct uart_port *port) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 343 | { |
| 344 | v850e_intc_disable_irq (V850E_UART_TX_IRQ (port->line)); |
| 345 | v850e_uart_tx (port); |
| 346 | v850e_intc_enable_irq (V850E_UART_TX_IRQ (port->line)); |
| 347 | } |
| 348 | |
Russell King | b129a8c | 2005-08-31 10:12:14 +0100 | [diff] [blame] | 349 | static void v850e_uart_stop_tx (struct uart_port *port) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 350 | { |
| 351 | v850e_intc_disable_irq (V850E_UART_TX_IRQ (port->line)); |
| 352 | } |
| 353 | |
| 354 | static void v850e_uart_start_rx (struct uart_port *port) |
| 355 | { |
| 356 | v850e_intc_enable_irq (V850E_UART_RX_IRQ (port->line)); |
| 357 | } |
| 358 | |
| 359 | static void v850e_uart_stop_rx (struct uart_port *port) |
| 360 | { |
| 361 | v850e_intc_disable_irq (V850E_UART_RX_IRQ (port->line)); |
| 362 | } |
| 363 | |
| 364 | static void v850e_uart_break_ctl (struct uart_port *port, int break_ctl) |
| 365 | { |
| 366 | /* Umm, do this later. */ |
| 367 | } |
| 368 | |
| 369 | static int v850e_uart_startup (struct uart_port *port) |
| 370 | { |
| 371 | int err; |
| 372 | |
| 373 | /* Alloc RX irq. */ |
| 374 | err = request_irq (V850E_UART_RX_IRQ (port->line), v850e_uart_rx_irq, |
Thomas Gleixner | 40663cc | 2006-07-01 19:29:43 -0700 | [diff] [blame] | 375 | IRQF_DISABLED, "v850e_uart", port); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 376 | if (err) |
| 377 | return err; |
| 378 | |
| 379 | /* Alloc TX irq. */ |
| 380 | err = request_irq (V850E_UART_TX_IRQ (port->line), v850e_uart_tx_irq, |
Thomas Gleixner | 40663cc | 2006-07-01 19:29:43 -0700 | [diff] [blame] | 381 | IRQF_DISABLED, "v850e_uart", port); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 382 | if (err) { |
| 383 | free_irq (V850E_UART_RX_IRQ (port->line), port); |
| 384 | return err; |
| 385 | } |
| 386 | |
| 387 | v850e_uart_start_rx (port); |
| 388 | |
| 389 | return 0; |
| 390 | } |
| 391 | |
| 392 | static void v850e_uart_shutdown (struct uart_port *port) |
| 393 | { |
| 394 | /* Disable port interrupts. */ |
| 395 | free_irq (V850E_UART_TX_IRQ (port->line), port); |
| 396 | free_irq (V850E_UART_RX_IRQ (port->line), port); |
| 397 | |
| 398 | /* Turn off xmit/recv enable bits. */ |
| 399 | V850E_UART_CONFIG (port->line) |
| 400 | &= ~(V850E_UART_CONFIG_TX_ENABLE |
| 401 | | V850E_UART_CONFIG_RX_ENABLE); |
| 402 | /* Then reset the channel. */ |
| 403 | V850E_UART_CONFIG (port->line) = 0; |
| 404 | } |
| 405 | |
| 406 | static void |
Alan Cox | 606d099 | 2006-12-08 02:38:45 -0800 | [diff] [blame^] | 407 | v850e_uart_set_termios (struct uart_port *port, struct ktermios *termios, |
| 408 | struct ktermios *old) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 409 | { |
| 410 | unsigned cflags = termios->c_cflag; |
| 411 | |
| 412 | /* Restrict flags to legal values. */ |
| 413 | if ((cflags & CSIZE) != CS7 && (cflags & CSIZE) != CS8) |
| 414 | /* The new value of CSIZE is invalid, use the old value. */ |
| 415 | cflags = (cflags & ~CSIZE) |
| 416 | | (old ? (old->c_cflag & CSIZE) : CS8); |
| 417 | |
| 418 | termios->c_cflag = cflags; |
| 419 | |
| 420 | v850e_uart_configure (port->line, cflags, |
| 421 | uart_get_baud_rate (port, termios, old, |
| 422 | v850e_uart_min_baud(), |
| 423 | v850e_uart_max_baud())); |
| 424 | } |
| 425 | |
| 426 | static const char *v850e_uart_type (struct uart_port *port) |
| 427 | { |
| 428 | return port->type == PORT_V850E_UART ? "v850e_uart" : 0; |
| 429 | } |
| 430 | |
| 431 | static void v850e_uart_config_port (struct uart_port *port, int flags) |
| 432 | { |
| 433 | if (flags & UART_CONFIG_TYPE) |
| 434 | port->type = PORT_V850E_UART; |
| 435 | } |
| 436 | |
| 437 | static int |
| 438 | v850e_uart_verify_port (struct uart_port *port, struct serial_struct *ser) |
| 439 | { |
| 440 | if (ser->type != PORT_UNKNOWN && ser->type != PORT_V850E_UART) |
| 441 | return -EINVAL; |
| 442 | if (ser->irq != V850E_UART_TX_IRQ (port->line)) |
| 443 | return -EINVAL; |
| 444 | return 0; |
| 445 | } |
| 446 | |
| 447 | static struct uart_ops v850e_uart_ops = { |
| 448 | .tx_empty = v850e_uart_tx_empty, |
| 449 | .get_mctrl = v850e_uart_get_mctrl, |
| 450 | .set_mctrl = v850e_uart_set_mctrl, |
| 451 | .start_tx = v850e_uart_start_tx, |
| 452 | .stop_tx = v850e_uart_stop_tx, |
| 453 | .stop_rx = v850e_uart_stop_rx, |
| 454 | .enable_ms = v850e_uart_nop, |
| 455 | .break_ctl = v850e_uart_break_ctl, |
| 456 | .startup = v850e_uart_startup, |
| 457 | .shutdown = v850e_uart_shutdown, |
| 458 | .set_termios = v850e_uart_set_termios, |
| 459 | .type = v850e_uart_type, |
| 460 | .release_port = v850e_uart_nop, |
| 461 | .request_port = v850e_uart_success, |
| 462 | .config_port = v850e_uart_config_port, |
| 463 | .verify_port = v850e_uart_verify_port, |
| 464 | }; |
| 465 | |
| 466 | /* Initialization and cleanup. */ |
| 467 | |
| 468 | static struct uart_driver v850e_uart_driver = { |
| 469 | .owner = THIS_MODULE, |
| 470 | .driver_name = "v850e_uart", |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 471 | .dev_name = "ttyS", |
| 472 | .major = TTY_MAJOR, |
| 473 | .minor = V850E_UART_MINOR_BASE, |
| 474 | .nr = V850E_UART_NUM_CHANNELS, |
| 475 | .cons = V850E_UART_CONSOLE, |
| 476 | }; |
| 477 | |
| 478 | |
| 479 | static struct uart_port v850e_uart_ports[V850E_UART_NUM_CHANNELS]; |
| 480 | |
| 481 | static int __init v850e_uart_init (void) |
| 482 | { |
| 483 | int rval; |
| 484 | |
| 485 | printk (KERN_INFO "%s on-chip UART\n", V850E_UART_CHIP_NAME); |
| 486 | |
| 487 | rval = uart_register_driver (&v850e_uart_driver); |
| 488 | if (rval == 0) { |
| 489 | unsigned chan; |
| 490 | |
| 491 | for (chan = 0; chan < V850E_UART_NUM_CHANNELS; chan++) { |
| 492 | struct uart_port *port = &v850e_uart_ports[chan]; |
| 493 | |
| 494 | memset (port, 0, sizeof *port); |
| 495 | |
| 496 | port->ops = &v850e_uart_ops; |
| 497 | port->line = chan; |
Russell King | 9b4a161 | 2006-02-05 10:48:10 +0000 | [diff] [blame] | 498 | port->iotype = UPIO_MEM; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 499 | port->flags = UPF_BOOT_AUTOCONF; |
| 500 | |
| 501 | /* We actually use multiple IRQs, but the serial |
| 502 | framework seems to mainly use this for |
| 503 | informational purposes anyway. Here we use the TX |
| 504 | irq. */ |
| 505 | port->irq = V850E_UART_TX_IRQ (chan); |
| 506 | |
| 507 | /* The serial framework doesn't really use these |
| 508 | membase/mapbase fields for anything useful, but |
| 509 | it requires that they be something non-zero to |
| 510 | consider the port `valid', and also uses them |
| 511 | for informational purposes. */ |
| 512 | port->membase = (void *)V850E_UART_BASE_ADDR (chan); |
| 513 | port->mapbase = V850E_UART_BASE_ADDR (chan); |
| 514 | |
| 515 | /* The framework insists on knowing the uart's master |
| 516 | clock freq, though it doesn't seem to do anything |
| 517 | useful for us with it. We must make it at least |
| 518 | higher than (the maximum baud rate * 16), otherwise |
| 519 | the framework will puke during its internal |
| 520 | calculations, and force the baud rate to be 9600. |
| 521 | To be accurate though, just repeat the calculation |
| 522 | we use when actually setting the speed. */ |
| 523 | port->uartclk = v850e_uart_max_clock() * 16; |
| 524 | |
| 525 | uart_add_one_port (&v850e_uart_driver, port); |
| 526 | } |
| 527 | } |
| 528 | |
| 529 | return rval; |
| 530 | } |
| 531 | |
| 532 | static void __exit v850e_uart_exit (void) |
| 533 | { |
| 534 | unsigned chan; |
| 535 | |
| 536 | for (chan = 0; chan < V850E_UART_NUM_CHANNELS; chan++) |
| 537 | uart_remove_one_port (&v850e_uart_driver, |
| 538 | &v850e_uart_ports[chan]); |
| 539 | |
| 540 | uart_unregister_driver (&v850e_uart_driver); |
| 541 | } |
| 542 | |
| 543 | module_init (v850e_uart_init); |
| 544 | module_exit (v850e_uart_exit); |
| 545 | |
| 546 | MODULE_AUTHOR ("Miles Bader"); |
| 547 | MODULE_DESCRIPTION ("NEC " V850E_UART_CHIP_NAME " on-chip UART"); |
| 548 | MODULE_LICENSE ("GPL"); |