Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | /* 68328serial.c: Serial port driver for 68328 microcontroller |
| 2 | * |
| 3 | * Copyright (C) 1995 David S. Miller <davem@caip.rutgers.edu> |
| 4 | * Copyright (C) 1998 Kenneth Albanowski <kjahds@kjahds.com> |
| 5 | * Copyright (C) 1998, 1999 D. Jeff Dionne <jeff@uclinux.org> |
| 6 | * Copyright (C) 1999 Vladimir Gurevich <vgurevic@cisco.com> |
| 7 | * Copyright (C) 2002-2003 David McCullough <davidm@snapgear.com> |
| 8 | * Copyright (C) 2002 Greg Ungerer <gerg@snapgear.com> |
| 9 | * |
| 10 | * VZ Support/Fixes Evan Stawnyczy <e@lineo.ca> |
| 11 | * Multiple UART support Daniel Potts <danielp@cse.unsw.edu.au> |
| 12 | * Power management support Daniel Potts <danielp@cse.unsw.edu.au> |
| 13 | * VZ Second Serial Port enable Phil Wilshire |
| 14 | * 2.4/2.5 port David McCullough |
| 15 | */ |
| 16 | |
| 17 | #include <asm/dbg.h> |
| 18 | #include <linux/module.h> |
| 19 | #include <linux/errno.h> |
| 20 | #include <linux/signal.h> |
| 21 | #include <linux/sched.h> |
| 22 | #include <linux/timer.h> |
| 23 | #include <linux/interrupt.h> |
| 24 | #include <linux/tty.h> |
| 25 | #include <linux/tty_flip.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 26 | #include <linux/major.h> |
| 27 | #include <linux/string.h> |
| 28 | #include <linux/fcntl.h> |
| 29 | #include <linux/mm.h> |
| 30 | #include <linux/kernel.h> |
| 31 | #include <linux/console.h> |
| 32 | #include <linux/reboot.h> |
| 33 | #include <linux/keyboard.h> |
| 34 | #include <linux/init.h> |
| 35 | #include <linux/pm.h> |
| 36 | #include <linux/bitops.h> |
| 37 | #include <linux/delay.h> |
Tejun Heo | 5a0e3ad | 2010-03-24 17:04:11 +0900 | [diff] [blame] | 38 | #include <linux/gfp.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 39 | |
| 40 | #include <asm/io.h> |
| 41 | #include <asm/irq.h> |
| 42 | #include <asm/system.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 43 | #include <asm/delay.h> |
| 44 | #include <asm/uaccess.h> |
| 45 | |
| 46 | /* (es) */ |
| 47 | /* note: perhaps we can murge these files, so that you can just |
| 48 | * define 1 of them, and they can sort that out for themselves |
| 49 | */ |
| 50 | #if defined(CONFIG_M68EZ328) |
| 51 | #include <asm/MC68EZ328.h> |
| 52 | #else |
| 53 | #if defined(CONFIG_M68VZ328) |
| 54 | #include <asm/MC68VZ328.h> |
| 55 | #else |
| 56 | #include <asm/MC68328.h> |
| 57 | #endif /* CONFIG_M68VZ328 */ |
| 58 | #endif /* CONFIG_M68EZ328 */ |
| 59 | |
| 60 | #include "68328serial.h" |
| 61 | |
| 62 | /* Turn off usage of real serial interrupt code, to "support" Copilot */ |
| 63 | #ifdef CONFIG_XCOPILOT_BUGS |
| 64 | #undef USE_INTS |
| 65 | #else |
| 66 | #define USE_INTS |
| 67 | #endif |
| 68 | |
| 69 | static struct m68k_serial m68k_soft[NR_PORTS]; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 70 | |
| 71 | static unsigned int uart_irqs[NR_PORTS] = UART_IRQ_DEFNS; |
| 72 | |
| 73 | /* multiple ports are contiguous in memory */ |
| 74 | m68328_uart *uart_addr = (m68328_uart *)USTCNT_ADDR; |
| 75 | |
| 76 | struct tty_struct m68k_ttys; |
| 77 | struct m68k_serial *m68k_consinfo = 0; |
| 78 | |
| 79 | #define M68K_CLOCK (16667000) /* FIXME: 16MHz is likely wrong */ |
| 80 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 81 | struct tty_driver *serial_driver; |
| 82 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 83 | /* number of characters left in xmit buffer before we ask for more */ |
| 84 | #define WAKEUP_CHARS 256 |
| 85 | |
| 86 | /* Debugging... DEBUG_INTR is bad to use when one of the zs |
| 87 | * lines is your console ;( |
| 88 | */ |
| 89 | #undef SERIAL_DEBUG_INTR |
| 90 | #undef SERIAL_DEBUG_OPEN |
| 91 | #undef SERIAL_DEBUG_FLOW |
| 92 | |
| 93 | #define RS_ISR_PASS_LIMIT 256 |
| 94 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 95 | static void change_speed(struct m68k_serial *info); |
| 96 | |
| 97 | /* |
| 98 | * Setup for console. Argument comes from the boot command line. |
| 99 | */ |
| 100 | |
Christoph Egger | f5e92c3 | 2010-07-20 15:26:54 -0700 | [diff] [blame] | 101 | /* note: this is messy, but it works, again, perhaps defined somewhere else?*/ |
| 102 | #ifdef CONFIG_M68VZ328 |
| 103 | #define CONSOLE_BAUD_RATE 19200 |
| 104 | #define DEFAULT_CBAUD B19200 |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 105 | #endif |
| 106 | |
Christoph Egger | f5e92c3 | 2010-07-20 15:26:54 -0700 | [diff] [blame] | 107 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 108 | #ifndef CONSOLE_BAUD_RATE |
| 109 | #define CONSOLE_BAUD_RATE 9600 |
| 110 | #define DEFAULT_CBAUD B9600 |
| 111 | #endif |
| 112 | |
| 113 | |
| 114 | static int m68328_console_initted = 0; |
| 115 | static int m68328_console_baud = CONSOLE_BAUD_RATE; |
| 116 | static int m68328_console_cbaud = DEFAULT_CBAUD; |
| 117 | |
| 118 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 119 | static inline int serial_paranoia_check(struct m68k_serial *info, |
| 120 | char *name, const char *routine) |
| 121 | { |
| 122 | #ifdef SERIAL_PARANOIA_CHECK |
| 123 | static const char *badmagic = |
| 124 | "Warning: bad magic number for serial struct %s in %s\n"; |
| 125 | static const char *badinfo = |
| 126 | "Warning: null m68k_serial for %s in %s\n"; |
| 127 | |
| 128 | if (!info) { |
| 129 | printk(badinfo, name, routine); |
| 130 | return 1; |
| 131 | } |
| 132 | if (info->magic != SERIAL_MAGIC) { |
| 133 | printk(badmagic, name, routine); |
| 134 | return 1; |
| 135 | } |
| 136 | #endif |
| 137 | return 0; |
| 138 | } |
| 139 | |
| 140 | /* |
| 141 | * This is used to figure out the divisor speeds and the timeouts |
| 142 | */ |
| 143 | static int baud_table[] = { |
| 144 | 0, 50, 75, 110, 134, 150, 200, 300, 600, 1200, 1800, 2400, 4800, |
| 145 | 9600, 19200, 38400, 57600, 115200, 0 }; |
| 146 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 147 | /* Sets or clears DTR/RTS on the requested line */ |
| 148 | static inline void m68k_rtsdtr(struct m68k_serial *ss, int set) |
| 149 | { |
| 150 | if (set) { |
| 151 | /* set the RTS/CTS line */ |
| 152 | } else { |
| 153 | /* clear it */ |
| 154 | } |
| 155 | return; |
| 156 | } |
| 157 | |
| 158 | /* Utility routines */ |
| 159 | static inline int get_baud(struct m68k_serial *ss) |
| 160 | { |
| 161 | unsigned long result = 115200; |
| 162 | unsigned short int baud = uart_addr[ss->line].ubaud; |
| 163 | if (GET_FIELD(baud, UBAUD_PRESCALER) == 0x38) result = 38400; |
| 164 | result >>= GET_FIELD(baud, UBAUD_DIVIDE); |
| 165 | |
| 166 | return result; |
| 167 | } |
| 168 | |
| 169 | /* |
| 170 | * ------------------------------------------------------------ |
| 171 | * rs_stop() and rs_start() |
| 172 | * |
| 173 | * This routines are called before setting or resetting tty->stopped. |
| 174 | * They enable or disable transmitter interrupts, as necessary. |
| 175 | * ------------------------------------------------------------ |
| 176 | */ |
| 177 | static void rs_stop(struct tty_struct *tty) |
| 178 | { |
| 179 | struct m68k_serial *info = (struct m68k_serial *)tty->driver_data; |
| 180 | m68328_uart *uart = &uart_addr[info->line]; |
| 181 | unsigned long flags; |
| 182 | |
| 183 | if (serial_paranoia_check(info, tty->name, "rs_stop")) |
| 184 | return; |
| 185 | |
Greg Ungerer | 727dda8 | 2006-06-28 15:54:22 +1000 | [diff] [blame] | 186 | local_irq_save(flags); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 187 | uart->ustcnt &= ~USTCNT_TXEN; |
Greg Ungerer | 727dda8 | 2006-06-28 15:54:22 +1000 | [diff] [blame] | 188 | local_irq_restore(flags); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 189 | } |
| 190 | |
Alan Cox | 09a6ffa | 2008-04-30 00:54:01 -0700 | [diff] [blame] | 191 | static int rs_put_char(char ch) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 192 | { |
| 193 | int flags, loops = 0; |
| 194 | |
Greg Ungerer | 727dda8 | 2006-06-28 15:54:22 +1000 | [diff] [blame] | 195 | local_irq_save(flags); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 196 | |
| 197 | while (!(UTX & UTX_TX_AVAIL) && (loops < 1000)) { |
| 198 | loops++; |
| 199 | udelay(5); |
| 200 | } |
| 201 | |
| 202 | UTX_TXDATA = ch; |
| 203 | udelay(5); |
Greg Ungerer | 727dda8 | 2006-06-28 15:54:22 +1000 | [diff] [blame] | 204 | local_irq_restore(flags); |
Alan Cox | 09a6ffa | 2008-04-30 00:54:01 -0700 | [diff] [blame] | 205 | return 1; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 206 | } |
| 207 | |
| 208 | static void rs_start(struct tty_struct *tty) |
| 209 | { |
| 210 | struct m68k_serial *info = (struct m68k_serial *)tty->driver_data; |
| 211 | m68328_uart *uart = &uart_addr[info->line]; |
| 212 | unsigned long flags; |
| 213 | |
| 214 | if (serial_paranoia_check(info, tty->name, "rs_start")) |
| 215 | return; |
| 216 | |
Greg Ungerer | 727dda8 | 2006-06-28 15:54:22 +1000 | [diff] [blame] | 217 | local_irq_save(flags); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 218 | if (info->xmit_cnt && info->xmit_buf && !(uart->ustcnt & USTCNT_TXEN)) { |
| 219 | #ifdef USE_INTS |
| 220 | uart->ustcnt |= USTCNT_TXEN | USTCNT_TX_INTR_MASK; |
| 221 | #else |
| 222 | uart->ustcnt |= USTCNT_TXEN; |
| 223 | #endif |
| 224 | } |
Greg Ungerer | 727dda8 | 2006-06-28 15:54:22 +1000 | [diff] [blame] | 225 | local_irq_restore(flags); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 226 | } |
| 227 | |
| 228 | /* Drop into either the boot monitor or kadb upon receiving a break |
| 229 | * from keyboard/console input. |
| 230 | */ |
| 231 | static void batten_down_hatches(void) |
| 232 | { |
| 233 | /* Drop into the debugger */ |
| 234 | } |
| 235 | |
Adrian Bunk | 41c28ff | 2006-03-23 03:00:56 -0800 | [diff] [blame] | 236 | static void status_handle(struct m68k_serial *info, unsigned short status) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 237 | { |
| 238 | #if 0 |
| 239 | if(status & DCD) { |
Takashi Iwai | a88487c | 2008-07-16 21:54:42 +0100 | [diff] [blame] | 240 | if((info->port.tty->termios->c_cflag & CRTSCTS) && |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 241 | ((info->curregs[3] & AUTO_ENAB)==0)) { |
| 242 | info->curregs[3] |= AUTO_ENAB; |
| 243 | info->pendregs[3] |= AUTO_ENAB; |
| 244 | write_zsreg(info->m68k_channel, 3, info->curregs[3]); |
| 245 | } |
| 246 | } else { |
| 247 | if((info->curregs[3] & AUTO_ENAB)) { |
| 248 | info->curregs[3] &= ~AUTO_ENAB; |
| 249 | info->pendregs[3] &= ~AUTO_ENAB; |
| 250 | write_zsreg(info->m68k_channel, 3, info->curregs[3]); |
| 251 | } |
| 252 | } |
| 253 | #endif |
| 254 | /* If this is console input and this is a |
| 255 | * 'break asserted' status change interrupt |
| 256 | * see if we can drop into the debugger |
| 257 | */ |
| 258 | if((status & URX_BREAK) && info->break_abort) |
| 259 | batten_down_hatches(); |
| 260 | return; |
| 261 | } |
| 262 | |
David Howells | 7d12e78 | 2006-10-05 14:55:46 +0100 | [diff] [blame] | 263 | static void receive_chars(struct m68k_serial *info, unsigned short rx) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 264 | { |
Takashi Iwai | a88487c | 2008-07-16 21:54:42 +0100 | [diff] [blame] | 265 | struct tty_struct *tty = info->port.tty; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 266 | m68328_uart *uart = &uart_addr[info->line]; |
Alan Cox | 33f0f88 | 2006-01-09 20:54:13 -0800 | [diff] [blame] | 267 | unsigned char ch, flag; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 268 | |
| 269 | /* |
| 270 | * This do { } while() loop will get ALL chars out of Rx FIFO |
| 271 | */ |
| 272 | #ifndef CONFIG_XCOPILOT_BUGS |
| 273 | do { |
| 274 | #endif |
| 275 | ch = GET_FIELD(rx, URX_RXDATA); |
| 276 | |
| 277 | if(info->is_cons) { |
| 278 | if(URX_BREAK & rx) { /* whee, break received */ |
| 279 | status_handle(info, rx); |
| 280 | return; |
| 281 | #ifdef CONFIG_MAGIC_SYSRQ |
| 282 | } else if (ch == 0x10) { /* ^P */ |
| 283 | show_state(); |
| 284 | show_free_areas(); |
| 285 | show_buffers(); |
| 286 | /* show_net_buffers(); */ |
| 287 | return; |
| 288 | } else if (ch == 0x12) { /* ^R */ |
Eric W. Biederman | 804ebf4 | 2005-07-26 11:59:54 -0600 | [diff] [blame] | 289 | emergency_restart(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 290 | return; |
| 291 | #endif /* CONFIG_MAGIC_SYSRQ */ |
| 292 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 293 | } |
| 294 | |
| 295 | if(!tty) |
| 296 | goto clear_and_exit; |
| 297 | |
Alan Cox | 33f0f88 | 2006-01-09 20:54:13 -0800 | [diff] [blame] | 298 | flag = TTY_NORMAL; |
| 299 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 300 | if(rx & URX_PARITY_ERROR) { |
Alan Cox | 33f0f88 | 2006-01-09 20:54:13 -0800 | [diff] [blame] | 301 | flag = TTY_PARITY; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 302 | status_handle(info, rx); |
| 303 | } else if(rx & URX_OVRUN) { |
Alan Cox | 33f0f88 | 2006-01-09 20:54:13 -0800 | [diff] [blame] | 304 | flag = TTY_OVERRUN; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 305 | status_handle(info, rx); |
| 306 | } else if(rx & URX_FRAME_ERROR) { |
Alan Cox | 33f0f88 | 2006-01-09 20:54:13 -0800 | [diff] [blame] | 307 | flag = TTY_FRAME; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 308 | status_handle(info, rx); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 309 | } |
Alan Cox | 33f0f88 | 2006-01-09 20:54:13 -0800 | [diff] [blame] | 310 | tty_insert_flip_char(tty, ch, flag); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 311 | #ifndef CONFIG_XCOPILOT_BUGS |
| 312 | } while((rx = uart->urx.w) & URX_DATA_READY); |
| 313 | #endif |
| 314 | |
Greg Ungerer | 8e63e66 | 2006-02-08 09:19:17 +1000 | [diff] [blame] | 315 | tty_schedule_flip(tty); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 316 | |
| 317 | clear_and_exit: |
| 318 | return; |
| 319 | } |
| 320 | |
Adrian Bunk | 41c28ff | 2006-03-23 03:00:56 -0800 | [diff] [blame] | 321 | static void transmit_chars(struct m68k_serial *info) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 322 | { |
| 323 | m68328_uart *uart = &uart_addr[info->line]; |
| 324 | |
| 325 | if (info->x_char) { |
| 326 | /* Send next char */ |
| 327 | uart->utx.b.txdata = info->x_char; |
| 328 | info->x_char = 0; |
| 329 | goto clear_and_return; |
| 330 | } |
| 331 | |
Takashi Iwai | a88487c | 2008-07-16 21:54:42 +0100 | [diff] [blame] | 332 | if((info->xmit_cnt <= 0) || info->port.tty->stopped) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 333 | /* That's peculiar... TX ints off */ |
| 334 | uart->ustcnt &= ~USTCNT_TX_INTR_MASK; |
| 335 | goto clear_and_return; |
| 336 | } |
| 337 | |
| 338 | /* Send char */ |
| 339 | uart->utx.b.txdata = info->xmit_buf[info->xmit_tail++]; |
| 340 | info->xmit_tail = info->xmit_tail & (SERIAL_XMIT_SIZE-1); |
| 341 | info->xmit_cnt--; |
| 342 | |
| 343 | if (info->xmit_cnt < WAKEUP_CHARS) |
| 344 | schedule_work(&info->tqueue); |
| 345 | |
| 346 | if(info->xmit_cnt <= 0) { |
| 347 | /* All done for now... TX ints off */ |
| 348 | uart->ustcnt &= ~USTCNT_TX_INTR_MASK; |
| 349 | goto clear_and_return; |
| 350 | } |
| 351 | |
| 352 | clear_and_return: |
| 353 | /* Clear interrupt (should be auto)*/ |
| 354 | return; |
| 355 | } |
| 356 | |
| 357 | /* |
| 358 | * This is the serial driver's generic interrupt routine |
| 359 | */ |
David Howells | 7d12e78 | 2006-10-05 14:55:46 +0100 | [diff] [blame] | 360 | irqreturn_t rs_interrupt(int irq, void *dev_id) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 361 | { |
Alan Cox | 25db8ad | 2008-08-19 20:49:40 -0700 | [diff] [blame] | 362 | struct m68k_serial *info = dev_id; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 363 | m68328_uart *uart; |
| 364 | unsigned short rx; |
| 365 | unsigned short tx; |
| 366 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 367 | uart = &uart_addr[info->line]; |
| 368 | rx = uart->urx.w; |
| 369 | |
| 370 | #ifdef USE_INTS |
| 371 | tx = uart->utx.w; |
| 372 | |
David Howells | 7d12e78 | 2006-10-05 14:55:46 +0100 | [diff] [blame] | 373 | if (rx & URX_DATA_READY) receive_chars(info, rx); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 374 | if (tx & UTX_TX_AVAIL) transmit_chars(info); |
| 375 | #else |
David Howells | 7d12e78 | 2006-10-05 14:55:46 +0100 | [diff] [blame] | 376 | receive_chars(info, rx); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 377 | #endif |
| 378 | return IRQ_HANDLED; |
| 379 | } |
| 380 | |
Greg Ungerer | 931f9cd | 2007-07-25 22:07:20 +1000 | [diff] [blame] | 381 | static void do_softint(struct work_struct *work) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 382 | { |
Greg Ungerer | 931f9cd | 2007-07-25 22:07:20 +1000 | [diff] [blame] | 383 | struct m68k_serial *info = container_of(work, struct m68k_serial, tqueue); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 384 | struct tty_struct *tty; |
| 385 | |
Takashi Iwai | a88487c | 2008-07-16 21:54:42 +0100 | [diff] [blame] | 386 | tty = info->port.tty; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 387 | if (!tty) |
| 388 | return; |
| 389 | #if 0 |
| 390 | if (clear_bit(RS_EVENT_WRITE_WAKEUP, &info->event)) { |
| 391 | tty_wakeup(tty); |
| 392 | } |
| 393 | #endif |
| 394 | } |
| 395 | |
| 396 | /* |
| 397 | * This routine is called from the scheduler tqueue when the interrupt |
| 398 | * routine has signalled that a hangup has occurred. The path of |
| 399 | * hangup processing is: |
| 400 | * |
| 401 | * serial interrupt routine -> (scheduler tqueue) -> |
| 402 | * do_serial_hangup() -> tty->hangup() -> rs_hangup() |
| 403 | * |
| 404 | */ |
Greg Ungerer | 931f9cd | 2007-07-25 22:07:20 +1000 | [diff] [blame] | 405 | static void do_serial_hangup(struct work_struct *work) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 406 | { |
Greg Ungerer | 931f9cd | 2007-07-25 22:07:20 +1000 | [diff] [blame] | 407 | struct m68k_serial *info = container_of(work, struct m68k_serial, tqueue_hangup); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 408 | struct tty_struct *tty; |
| 409 | |
Takashi Iwai | a88487c | 2008-07-16 21:54:42 +0100 | [diff] [blame] | 410 | tty = info->port.tty; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 411 | if (!tty) |
| 412 | return; |
| 413 | |
| 414 | tty_hangup(tty); |
| 415 | } |
| 416 | |
| 417 | |
| 418 | static int startup(struct m68k_serial * info) |
| 419 | { |
| 420 | m68328_uart *uart = &uart_addr[info->line]; |
| 421 | unsigned long flags; |
| 422 | |
| 423 | if (info->flags & S_INITIALIZED) |
| 424 | return 0; |
| 425 | |
| 426 | if (!info->xmit_buf) { |
| 427 | info->xmit_buf = (unsigned char *) __get_free_page(GFP_KERNEL); |
| 428 | if (!info->xmit_buf) |
| 429 | return -ENOMEM; |
| 430 | } |
| 431 | |
Greg Ungerer | 727dda8 | 2006-06-28 15:54:22 +1000 | [diff] [blame] | 432 | local_irq_save(flags); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 433 | |
| 434 | /* |
| 435 | * Clear the FIFO buffers and disable them |
| 436 | * (they will be reenabled in change_speed()) |
| 437 | */ |
| 438 | |
| 439 | uart->ustcnt = USTCNT_UEN; |
| 440 | info->xmit_fifo_size = 1; |
| 441 | uart->ustcnt = USTCNT_UEN | USTCNT_RXEN | USTCNT_TXEN; |
| 442 | (void)uart->urx.w; |
| 443 | |
| 444 | /* |
| 445 | * Finally, enable sequencing and interrupts |
| 446 | */ |
| 447 | #ifdef USE_INTS |
| 448 | uart->ustcnt = USTCNT_UEN | USTCNT_RXEN | |
| 449 | USTCNT_RX_INTR_MASK | USTCNT_TX_INTR_MASK; |
| 450 | #else |
| 451 | uart->ustcnt = USTCNT_UEN | USTCNT_RXEN | USTCNT_RX_INTR_MASK; |
| 452 | #endif |
| 453 | |
Takashi Iwai | a88487c | 2008-07-16 21:54:42 +0100 | [diff] [blame] | 454 | if (info->port.tty) |
| 455 | clear_bit(TTY_IO_ERROR, &info->port.tty->flags); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 456 | info->xmit_cnt = info->xmit_head = info->xmit_tail = 0; |
| 457 | |
| 458 | /* |
| 459 | * and set the speed of the serial port |
| 460 | */ |
| 461 | |
| 462 | change_speed(info); |
| 463 | |
| 464 | info->flags |= S_INITIALIZED; |
Greg Ungerer | 727dda8 | 2006-06-28 15:54:22 +1000 | [diff] [blame] | 465 | local_irq_restore(flags); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 466 | return 0; |
| 467 | } |
| 468 | |
| 469 | /* |
| 470 | * This routine will shutdown a serial port; interrupts are disabled, and |
| 471 | * DTR is dropped if the hangup on close termio flag is on. |
| 472 | */ |
| 473 | static void shutdown(struct m68k_serial * info) |
| 474 | { |
| 475 | m68328_uart *uart = &uart_addr[info->line]; |
| 476 | unsigned long flags; |
| 477 | |
| 478 | uart->ustcnt = 0; /* All off! */ |
| 479 | if (!(info->flags & S_INITIALIZED)) |
| 480 | return; |
| 481 | |
Greg Ungerer | 727dda8 | 2006-06-28 15:54:22 +1000 | [diff] [blame] | 482 | local_irq_save(flags); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 483 | |
| 484 | if (info->xmit_buf) { |
| 485 | free_page((unsigned long) info->xmit_buf); |
| 486 | info->xmit_buf = 0; |
| 487 | } |
| 488 | |
Takashi Iwai | a88487c | 2008-07-16 21:54:42 +0100 | [diff] [blame] | 489 | if (info->port.tty) |
| 490 | set_bit(TTY_IO_ERROR, &info->port.tty->flags); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 491 | |
| 492 | info->flags &= ~S_INITIALIZED; |
Greg Ungerer | 727dda8 | 2006-06-28 15:54:22 +1000 | [diff] [blame] | 493 | local_irq_restore(flags); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 494 | } |
| 495 | |
| 496 | struct { |
| 497 | int divisor, prescale; |
| 498 | } |
| 499 | #ifndef CONFIG_M68VZ328 |
| 500 | hw_baud_table[18] = { |
| 501 | {0,0}, /* 0 */ |
| 502 | {0,0}, /* 50 */ |
| 503 | {0,0}, /* 75 */ |
| 504 | {0,0}, /* 110 */ |
| 505 | {0,0}, /* 134 */ |
| 506 | {0,0}, /* 150 */ |
| 507 | {0,0}, /* 200 */ |
| 508 | {7,0x26}, /* 300 */ |
| 509 | {6,0x26}, /* 600 */ |
| 510 | {5,0x26}, /* 1200 */ |
| 511 | {0,0}, /* 1800 */ |
| 512 | {4,0x26}, /* 2400 */ |
| 513 | {3,0x26}, /* 4800 */ |
| 514 | {2,0x26}, /* 9600 */ |
| 515 | {1,0x26}, /* 19200 */ |
| 516 | {0,0x26}, /* 38400 */ |
| 517 | {1,0x38}, /* 57600 */ |
| 518 | {0,0x38}, /* 115200 */ |
| 519 | }; |
| 520 | #else |
| 521 | hw_baud_table[18] = { |
| 522 | {0,0}, /* 0 */ |
| 523 | {0,0}, /* 50 */ |
| 524 | {0,0}, /* 75 */ |
| 525 | {0,0}, /* 110 */ |
| 526 | {0,0}, /* 134 */ |
| 527 | {0,0}, /* 150 */ |
| 528 | {0,0}, /* 200 */ |
| 529 | {0,0}, /* 300 */ |
| 530 | {7,0x26}, /* 600 */ |
| 531 | {6,0x26}, /* 1200 */ |
| 532 | {0,0}, /* 1800 */ |
| 533 | {5,0x26}, /* 2400 */ |
| 534 | {4,0x26}, /* 4800 */ |
| 535 | {3,0x26}, /* 9600 */ |
| 536 | {2,0x26}, /* 19200 */ |
| 537 | {1,0x26}, /* 38400 */ |
| 538 | {0,0x26}, /* 57600 */ |
| 539 | {1,0x38}, /* 115200 */ |
| 540 | }; |
| 541 | #endif |
| 542 | /* rate = 1036800 / ((65 - prescale) * (1<<divider)) */ |
| 543 | |
| 544 | /* |
| 545 | * This routine is called to set the UART divisor registers to match |
| 546 | * the specified baud rate for a serial port. |
| 547 | */ |
| 548 | static void change_speed(struct m68k_serial *info) |
| 549 | { |
| 550 | m68328_uart *uart = &uart_addr[info->line]; |
| 551 | unsigned short port; |
| 552 | unsigned short ustcnt; |
| 553 | unsigned cflag; |
| 554 | int i; |
| 555 | |
Takashi Iwai | a88487c | 2008-07-16 21:54:42 +0100 | [diff] [blame] | 556 | if (!info->port.tty || !info->port.tty->termios) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 557 | return; |
Takashi Iwai | a88487c | 2008-07-16 21:54:42 +0100 | [diff] [blame] | 558 | cflag = info->port.tty->termios->c_cflag; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 559 | if (!(port = info->port)) |
| 560 | return; |
| 561 | |
| 562 | ustcnt = uart->ustcnt; |
| 563 | uart->ustcnt = ustcnt & ~USTCNT_TXEN; |
| 564 | |
| 565 | i = cflag & CBAUD; |
| 566 | if (i & CBAUDEX) { |
| 567 | i = (i & ~CBAUDEX) + B38400; |
| 568 | } |
| 569 | |
| 570 | info->baud = baud_table[i]; |
| 571 | uart->ubaud = PUT_FIELD(UBAUD_DIVIDE, hw_baud_table[i].divisor) | |
| 572 | PUT_FIELD(UBAUD_PRESCALER, hw_baud_table[i].prescale); |
| 573 | |
| 574 | ustcnt &= ~(USTCNT_PARITYEN | USTCNT_ODD_EVEN | USTCNT_STOP | USTCNT_8_7); |
| 575 | |
| 576 | if ((cflag & CSIZE) == CS8) |
| 577 | ustcnt |= USTCNT_8_7; |
| 578 | |
| 579 | if (cflag & CSTOPB) |
| 580 | ustcnt |= USTCNT_STOP; |
| 581 | |
| 582 | if (cflag & PARENB) |
| 583 | ustcnt |= USTCNT_PARITYEN; |
| 584 | if (cflag & PARODD) |
| 585 | ustcnt |= USTCNT_ODD_EVEN; |
| 586 | |
| 587 | #ifdef CONFIG_SERIAL_68328_RTS_CTS |
| 588 | if (cflag & CRTSCTS) { |
| 589 | uart->utx.w &= ~ UTX_NOCTS; |
| 590 | } else { |
| 591 | uart->utx.w |= UTX_NOCTS; |
| 592 | } |
| 593 | #endif |
| 594 | |
| 595 | ustcnt |= USTCNT_TXEN; |
| 596 | |
| 597 | uart->ustcnt = ustcnt; |
| 598 | return; |
| 599 | } |
| 600 | |
| 601 | /* |
| 602 | * Fair output driver allows a process to speak. |
| 603 | */ |
| 604 | static void rs_fair_output(void) |
| 605 | { |
| 606 | int left; /* Output no more than that */ |
| 607 | unsigned long flags; |
| 608 | struct m68k_serial *info = &m68k_soft[0]; |
| 609 | char c; |
| 610 | |
| 611 | if (info == 0) return; |
| 612 | if (info->xmit_buf == 0) return; |
| 613 | |
Greg Ungerer | 727dda8 | 2006-06-28 15:54:22 +1000 | [diff] [blame] | 614 | local_irq_save(flags); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 615 | left = info->xmit_cnt; |
| 616 | while (left != 0) { |
| 617 | c = info->xmit_buf[info->xmit_tail]; |
| 618 | info->xmit_tail = (info->xmit_tail+1) & (SERIAL_XMIT_SIZE-1); |
| 619 | info->xmit_cnt--; |
Greg Ungerer | 727dda8 | 2006-06-28 15:54:22 +1000 | [diff] [blame] | 620 | local_irq_restore(flags); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 621 | |
| 622 | rs_put_char(c); |
| 623 | |
Greg Ungerer | 727dda8 | 2006-06-28 15:54:22 +1000 | [diff] [blame] | 624 | local_irq_save(flags); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 625 | left = min(info->xmit_cnt, left-1); |
| 626 | } |
| 627 | |
| 628 | /* Last character is being transmitted now (hopefully). */ |
| 629 | udelay(5); |
| 630 | |
Greg Ungerer | 727dda8 | 2006-06-28 15:54:22 +1000 | [diff] [blame] | 631 | local_irq_restore(flags); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 632 | return; |
| 633 | } |
| 634 | |
| 635 | /* |
| 636 | * m68k_console_print is registered for printk. |
| 637 | */ |
| 638 | void console_print_68328(const char *p) |
| 639 | { |
| 640 | char c; |
| 641 | |
| 642 | while((c=*(p++)) != 0) { |
| 643 | if(c == '\n') |
| 644 | rs_put_char('\r'); |
| 645 | rs_put_char(c); |
| 646 | } |
| 647 | |
| 648 | /* Comment this if you want to have a strict interrupt-driven output */ |
| 649 | rs_fair_output(); |
| 650 | |
| 651 | return; |
| 652 | } |
| 653 | |
| 654 | static void rs_set_ldisc(struct tty_struct *tty) |
| 655 | { |
| 656 | struct m68k_serial *info = (struct m68k_serial *)tty->driver_data; |
| 657 | |
| 658 | if (serial_paranoia_check(info, tty->name, "rs_set_ldisc")) |
| 659 | return; |
| 660 | |
| 661 | info->is_cons = (tty->termios->c_line == N_TTY); |
| 662 | |
| 663 | printk("ttyS%d console mode %s\n", info->line, info->is_cons ? "on" : "off"); |
| 664 | } |
| 665 | |
| 666 | static void rs_flush_chars(struct tty_struct *tty) |
| 667 | { |
| 668 | struct m68k_serial *info = (struct m68k_serial *)tty->driver_data; |
| 669 | m68328_uart *uart = &uart_addr[info->line]; |
| 670 | unsigned long flags; |
| 671 | |
| 672 | if (serial_paranoia_check(info, tty->name, "rs_flush_chars")) |
| 673 | return; |
| 674 | #ifndef USE_INTS |
| 675 | for(;;) { |
| 676 | #endif |
| 677 | |
| 678 | /* Enable transmitter */ |
Greg Ungerer | 727dda8 | 2006-06-28 15:54:22 +1000 | [diff] [blame] | 679 | local_irq_save(flags); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 680 | |
| 681 | if (info->xmit_cnt <= 0 || tty->stopped || tty->hw_stopped || |
| 682 | !info->xmit_buf) { |
Greg Ungerer | 727dda8 | 2006-06-28 15:54:22 +1000 | [diff] [blame] | 683 | local_irq_restore(flags); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 684 | return; |
| 685 | } |
| 686 | |
| 687 | #ifdef USE_INTS |
| 688 | uart->ustcnt |= USTCNT_TXEN | USTCNT_TX_INTR_MASK; |
| 689 | #else |
| 690 | uart->ustcnt |= USTCNT_TXEN; |
| 691 | #endif |
| 692 | |
| 693 | #ifdef USE_INTS |
| 694 | if (uart->utx.w & UTX_TX_AVAIL) { |
| 695 | #else |
| 696 | if (1) { |
| 697 | #endif |
| 698 | /* Send char */ |
| 699 | uart->utx.b.txdata = info->xmit_buf[info->xmit_tail++]; |
| 700 | info->xmit_tail = info->xmit_tail & (SERIAL_XMIT_SIZE-1); |
| 701 | info->xmit_cnt--; |
| 702 | } |
| 703 | |
| 704 | #ifndef USE_INTS |
| 705 | while (!(uart->utx.w & UTX_TX_AVAIL)) udelay(5); |
| 706 | } |
| 707 | #endif |
Greg Ungerer | 727dda8 | 2006-06-28 15:54:22 +1000 | [diff] [blame] | 708 | local_irq_restore(flags); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 709 | } |
| 710 | |
| 711 | extern void console_printn(const char * b, int count); |
| 712 | |
| 713 | static int rs_write(struct tty_struct * tty, |
| 714 | const unsigned char *buf, int count) |
| 715 | { |
| 716 | int c, total = 0; |
| 717 | struct m68k_serial *info = (struct m68k_serial *)tty->driver_data; |
| 718 | m68328_uart *uart = &uart_addr[info->line]; |
| 719 | unsigned long flags; |
| 720 | |
| 721 | if (serial_paranoia_check(info, tty->name, "rs_write")) |
| 722 | return 0; |
| 723 | |
| 724 | if (!tty || !info->xmit_buf) |
| 725 | return 0; |
| 726 | |
Greg Ungerer | 727dda8 | 2006-06-28 15:54:22 +1000 | [diff] [blame] | 727 | local_save_flags(flags); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 728 | while (1) { |
Greg Ungerer | 727dda8 | 2006-06-28 15:54:22 +1000 | [diff] [blame] | 729 | local_irq_disable(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 730 | c = min_t(int, count, min(SERIAL_XMIT_SIZE - info->xmit_cnt - 1, |
| 731 | SERIAL_XMIT_SIZE - info->xmit_head)); |
Greg Ungerer | 727dda8 | 2006-06-28 15:54:22 +1000 | [diff] [blame] | 732 | local_irq_restore(flags); |
| 733 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 734 | if (c <= 0) |
| 735 | break; |
| 736 | |
| 737 | memcpy(info->xmit_buf + info->xmit_head, buf, c); |
Greg Ungerer | 727dda8 | 2006-06-28 15:54:22 +1000 | [diff] [blame] | 738 | |
| 739 | local_irq_disable(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 740 | info->xmit_head = (info->xmit_head + c) & (SERIAL_XMIT_SIZE-1); |
| 741 | info->xmit_cnt += c; |
Greg Ungerer | 727dda8 | 2006-06-28 15:54:22 +1000 | [diff] [blame] | 742 | local_irq_restore(flags); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 743 | buf += c; |
| 744 | count -= c; |
| 745 | total += c; |
| 746 | } |
| 747 | |
| 748 | if (info->xmit_cnt && !tty->stopped && !tty->hw_stopped) { |
| 749 | /* Enable transmitter */ |
Greg Ungerer | 727dda8 | 2006-06-28 15:54:22 +1000 | [diff] [blame] | 750 | local_irq_disable(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 751 | #ifndef USE_INTS |
| 752 | while(info->xmit_cnt) { |
| 753 | #endif |
| 754 | |
| 755 | uart->ustcnt |= USTCNT_TXEN; |
| 756 | #ifdef USE_INTS |
| 757 | uart->ustcnt |= USTCNT_TX_INTR_MASK; |
| 758 | #else |
| 759 | while (!(uart->utx.w & UTX_TX_AVAIL)) udelay(5); |
| 760 | #endif |
| 761 | if (uart->utx.w & UTX_TX_AVAIL) { |
| 762 | uart->utx.b.txdata = info->xmit_buf[info->xmit_tail++]; |
| 763 | info->xmit_tail = info->xmit_tail & (SERIAL_XMIT_SIZE-1); |
| 764 | info->xmit_cnt--; |
| 765 | } |
| 766 | |
| 767 | #ifndef USE_INTS |
| 768 | } |
| 769 | #endif |
Greg Ungerer | 727dda8 | 2006-06-28 15:54:22 +1000 | [diff] [blame] | 770 | local_irq_restore(flags); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 771 | } |
Greg Ungerer | 727dda8 | 2006-06-28 15:54:22 +1000 | [diff] [blame] | 772 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 773 | return total; |
| 774 | } |
| 775 | |
| 776 | static int rs_write_room(struct tty_struct *tty) |
| 777 | { |
| 778 | struct m68k_serial *info = (struct m68k_serial *)tty->driver_data; |
| 779 | int ret; |
| 780 | |
| 781 | if (serial_paranoia_check(info, tty->name, "rs_write_room")) |
| 782 | return 0; |
| 783 | ret = SERIAL_XMIT_SIZE - info->xmit_cnt - 1; |
| 784 | if (ret < 0) |
| 785 | ret = 0; |
| 786 | return ret; |
| 787 | } |
| 788 | |
| 789 | static int rs_chars_in_buffer(struct tty_struct *tty) |
| 790 | { |
| 791 | struct m68k_serial *info = (struct m68k_serial *)tty->driver_data; |
| 792 | |
| 793 | if (serial_paranoia_check(info, tty->name, "rs_chars_in_buffer")) |
| 794 | return 0; |
| 795 | return info->xmit_cnt; |
| 796 | } |
| 797 | |
| 798 | static void rs_flush_buffer(struct tty_struct *tty) |
| 799 | { |
| 800 | struct m68k_serial *info = (struct m68k_serial *)tty->driver_data; |
Greg Ungerer | 727dda8 | 2006-06-28 15:54:22 +1000 | [diff] [blame] | 801 | unsigned long flags; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 802 | |
| 803 | if (serial_paranoia_check(info, tty->name, "rs_flush_buffer")) |
| 804 | return; |
Greg Ungerer | 727dda8 | 2006-06-28 15:54:22 +1000 | [diff] [blame] | 805 | local_irq_save(flags); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 806 | info->xmit_cnt = info->xmit_head = info->xmit_tail = 0; |
Greg Ungerer | 727dda8 | 2006-06-28 15:54:22 +1000 | [diff] [blame] | 807 | local_irq_restore(flags); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 808 | tty_wakeup(tty); |
| 809 | } |
| 810 | |
| 811 | /* |
| 812 | * ------------------------------------------------------------ |
| 813 | * rs_throttle() |
| 814 | * |
| 815 | * This routine is called by the upper-layer tty layer to signal that |
| 816 | * incoming characters should be throttled. |
| 817 | * ------------------------------------------------------------ |
| 818 | */ |
| 819 | static void rs_throttle(struct tty_struct * tty) |
| 820 | { |
| 821 | struct m68k_serial *info = (struct m68k_serial *)tty->driver_data; |
| 822 | |
| 823 | if (serial_paranoia_check(info, tty->name, "rs_throttle")) |
| 824 | return; |
| 825 | |
| 826 | if (I_IXOFF(tty)) |
| 827 | info->x_char = STOP_CHAR(tty); |
| 828 | |
| 829 | /* Turn off RTS line (do this atomic) */ |
| 830 | } |
| 831 | |
| 832 | static void rs_unthrottle(struct tty_struct * tty) |
| 833 | { |
| 834 | struct m68k_serial *info = (struct m68k_serial *)tty->driver_data; |
| 835 | |
| 836 | if (serial_paranoia_check(info, tty->name, "rs_unthrottle")) |
| 837 | return; |
| 838 | |
| 839 | if (I_IXOFF(tty)) { |
| 840 | if (info->x_char) |
| 841 | info->x_char = 0; |
| 842 | else |
| 843 | info->x_char = START_CHAR(tty); |
| 844 | } |
| 845 | |
| 846 | /* Assert RTS line (do this atomic) */ |
| 847 | } |
| 848 | |
| 849 | /* |
| 850 | * ------------------------------------------------------------ |
| 851 | * rs_ioctl() and friends |
| 852 | * ------------------------------------------------------------ |
| 853 | */ |
| 854 | |
| 855 | static int get_serial_info(struct m68k_serial * info, |
| 856 | struct serial_struct * retinfo) |
| 857 | { |
| 858 | struct serial_struct tmp; |
| 859 | |
| 860 | if (!retinfo) |
| 861 | return -EFAULT; |
| 862 | memset(&tmp, 0, sizeof(tmp)); |
| 863 | tmp.type = info->type; |
| 864 | tmp.line = info->line; |
| 865 | tmp.port = info->port; |
| 866 | tmp.irq = info->irq; |
| 867 | tmp.flags = info->flags; |
| 868 | tmp.baud_base = info->baud_base; |
| 869 | tmp.close_delay = info->close_delay; |
| 870 | tmp.closing_wait = info->closing_wait; |
| 871 | tmp.custom_divisor = info->custom_divisor; |
Kulikov Vasiliy | 5d56356 | 2010-08-01 10:29:06 +0400 | [diff] [blame] | 872 | if (copy_to_user(retinfo, &tmp, sizeof(*retinfo))) |
| 873 | return -EFAULT; |
| 874 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 875 | return 0; |
| 876 | } |
| 877 | |
| 878 | static int set_serial_info(struct m68k_serial * info, |
| 879 | struct serial_struct * new_info) |
| 880 | { |
| 881 | struct serial_struct new_serial; |
| 882 | struct m68k_serial old_info; |
| 883 | int retval = 0; |
| 884 | |
| 885 | if (!new_info) |
| 886 | return -EFAULT; |
Kulikov Vasiliy | 5d56356 | 2010-08-01 10:29:06 +0400 | [diff] [blame] | 887 | if (copy_from_user(&new_serial, new_info, sizeof(new_serial))) |
| 888 | return -EFAULT; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 889 | old_info = *info; |
| 890 | |
| 891 | if (!capable(CAP_SYS_ADMIN)) { |
| 892 | if ((new_serial.baud_base != info->baud_base) || |
| 893 | (new_serial.type != info->type) || |
| 894 | (new_serial.close_delay != info->close_delay) || |
| 895 | ((new_serial.flags & ~S_USR_MASK) != |
| 896 | (info->flags & ~S_USR_MASK))) |
| 897 | return -EPERM; |
| 898 | info->flags = ((info->flags & ~S_USR_MASK) | |
| 899 | (new_serial.flags & S_USR_MASK)); |
| 900 | info->custom_divisor = new_serial.custom_divisor; |
| 901 | goto check_and_exit; |
| 902 | } |
| 903 | |
| 904 | if (info->count > 1) |
| 905 | return -EBUSY; |
| 906 | |
| 907 | /* |
| 908 | * OK, past this point, all the error checking has been done. |
| 909 | * At this point, we start making changes..... |
| 910 | */ |
| 911 | |
| 912 | info->baud_base = new_serial.baud_base; |
| 913 | info->flags = ((info->flags & ~S_FLAGS) | |
| 914 | (new_serial.flags & S_FLAGS)); |
| 915 | info->type = new_serial.type; |
| 916 | info->close_delay = new_serial.close_delay; |
| 917 | info->closing_wait = new_serial.closing_wait; |
| 918 | |
| 919 | check_and_exit: |
| 920 | retval = startup(info); |
| 921 | return retval; |
| 922 | } |
| 923 | |
| 924 | /* |
| 925 | * get_lsr_info - get line status register info |
| 926 | * |
| 927 | * Purpose: Let user call ioctl() to get info when the UART physically |
| 928 | * is emptied. On bus types like RS485, the transmitter must |
| 929 | * release the bus after transmitting. This must be done when |
| 930 | * the transmit shift register is empty, not be done when the |
| 931 | * transmit holding register is empty. This functionality |
| 932 | * allows an RS485 driver to be written in user space. |
| 933 | */ |
| 934 | static int get_lsr_info(struct m68k_serial * info, unsigned int *value) |
| 935 | { |
| 936 | #ifdef CONFIG_SERIAL_68328_RTS_CTS |
| 937 | m68328_uart *uart = &uart_addr[info->line]; |
| 938 | #endif |
| 939 | unsigned char status; |
Greg Ungerer | 727dda8 | 2006-06-28 15:54:22 +1000 | [diff] [blame] | 940 | unsigned long flags; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 941 | |
Greg Ungerer | 727dda8 | 2006-06-28 15:54:22 +1000 | [diff] [blame] | 942 | local_irq_save(flags); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 943 | #ifdef CONFIG_SERIAL_68328_RTS_CTS |
| 944 | status = (uart->utx.w & UTX_CTS_STAT) ? 1 : 0; |
| 945 | #else |
| 946 | status = 0; |
| 947 | #endif |
Greg Ungerer | 727dda8 | 2006-06-28 15:54:22 +1000 | [diff] [blame] | 948 | local_irq_restore(flags); |
Kulikov Vasiliy | 5d56356 | 2010-08-01 10:29:06 +0400 | [diff] [blame] | 949 | return put_user(status, value); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 950 | } |
| 951 | |
| 952 | /* |
| 953 | * This routine sends a break character out the serial port. |
| 954 | */ |
Nishanth Aravamudan | 6a72c7b | 2005-06-25 14:59:33 -0700 | [diff] [blame] | 955 | static void send_break(struct m68k_serial * info, unsigned int duration) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 956 | { |
| 957 | m68328_uart *uart = &uart_addr[info->line]; |
| 958 | unsigned long flags; |
| 959 | if (!info->port) |
| 960 | return; |
Greg Ungerer | 727dda8 | 2006-06-28 15:54:22 +1000 | [diff] [blame] | 961 | local_irq_save(flags); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 962 | #ifdef USE_INTS |
| 963 | uart->utx.w |= UTX_SEND_BREAK; |
Nishanth Aravamudan | 6a72c7b | 2005-06-25 14:59:33 -0700 | [diff] [blame] | 964 | msleep_interruptible(duration); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 965 | uart->utx.w &= ~UTX_SEND_BREAK; |
| 966 | #endif |
Greg Ungerer | 727dda8 | 2006-06-28 15:54:22 +1000 | [diff] [blame] | 967 | local_irq_restore(flags); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 968 | } |
| 969 | |
| 970 | static int rs_ioctl(struct tty_struct *tty, struct file * file, |
| 971 | unsigned int cmd, unsigned long arg) |
| 972 | { |
| 973 | int error; |
| 974 | struct m68k_serial * info = (struct m68k_serial *)tty->driver_data; |
| 975 | int retval; |
| 976 | |
| 977 | if (serial_paranoia_check(info, tty->name, "rs_ioctl")) |
| 978 | return -ENODEV; |
| 979 | |
| 980 | if ((cmd != TIOCGSERIAL) && (cmd != TIOCSSERIAL) && |
| 981 | (cmd != TIOCSERCONFIG) && (cmd != TIOCSERGWILD) && |
| 982 | (cmd != TIOCSERSWILD) && (cmd != TIOCSERGSTRUCT)) { |
| 983 | if (tty->flags & (1 << TTY_IO_ERROR)) |
| 984 | return -EIO; |
| 985 | } |
| 986 | |
| 987 | switch (cmd) { |
| 988 | case TCSBRK: /* SVID version: non-zero arg --> no break */ |
| 989 | retval = tty_check_change(tty); |
| 990 | if (retval) |
| 991 | return retval; |
| 992 | tty_wait_until_sent(tty, 0); |
| 993 | if (!arg) |
Nishanth Aravamudan | 6a72c7b | 2005-06-25 14:59:33 -0700 | [diff] [blame] | 994 | send_break(info, 250); /* 1/4 second */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 995 | return 0; |
| 996 | case TCSBRKP: /* support for POSIX tcsendbreak() */ |
| 997 | retval = tty_check_change(tty); |
| 998 | if (retval) |
| 999 | return retval; |
| 1000 | tty_wait_until_sent(tty, 0); |
Nishanth Aravamudan | 6a72c7b | 2005-06-25 14:59:33 -0700 | [diff] [blame] | 1001 | send_break(info, arg ? arg*(100) : 250); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1002 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1003 | case TIOCGSERIAL: |
Kulikov Vasiliy | 5d56356 | 2010-08-01 10:29:06 +0400 | [diff] [blame] | 1004 | return get_serial_info(info, |
| 1005 | (struct serial_struct *) arg); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1006 | case TIOCSSERIAL: |
| 1007 | return set_serial_info(info, |
| 1008 | (struct serial_struct *) arg); |
| 1009 | case TIOCSERGETLSR: /* Get line status register */ |
Kulikov Vasiliy | 5d56356 | 2010-08-01 10:29:06 +0400 | [diff] [blame] | 1010 | return get_lsr_info(info, (unsigned int *) arg); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1011 | case TIOCSERGSTRUCT: |
Kulikov Vasiliy | 5d56356 | 2010-08-01 10:29:06 +0400 | [diff] [blame] | 1012 | if (copy_to_user((struct m68k_serial *) arg, |
| 1013 | info, sizeof(struct m68k_serial))) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1014 | return -EFAULT; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1015 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1016 | default: |
| 1017 | return -ENOIOCTLCMD; |
| 1018 | } |
| 1019 | return 0; |
| 1020 | } |
| 1021 | |
Alan Cox | 606d099 | 2006-12-08 02:38:45 -0800 | [diff] [blame] | 1022 | static void rs_set_termios(struct tty_struct *tty, struct ktermios *old_termios) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1023 | { |
| 1024 | struct m68k_serial *info = (struct m68k_serial *)tty->driver_data; |
| 1025 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1026 | change_speed(info); |
| 1027 | |
| 1028 | if ((old_termios->c_cflag & CRTSCTS) && |
| 1029 | !(tty->termios->c_cflag & CRTSCTS)) { |
| 1030 | tty->hw_stopped = 0; |
| 1031 | rs_start(tty); |
| 1032 | } |
| 1033 | |
| 1034 | } |
| 1035 | |
| 1036 | /* |
| 1037 | * ------------------------------------------------------------ |
| 1038 | * rs_close() |
| 1039 | * |
| 1040 | * This routine is called when the serial port gets closed. First, we |
| 1041 | * wait for the last remaining data to be sent. Then, we unlink its |
| 1042 | * S structure from the interrupt chain if necessary, and we free |
| 1043 | * that IRQ if nothing is left in the chain. |
| 1044 | * ------------------------------------------------------------ |
| 1045 | */ |
| 1046 | static void rs_close(struct tty_struct *tty, struct file * filp) |
| 1047 | { |
| 1048 | struct m68k_serial * info = (struct m68k_serial *)tty->driver_data; |
| 1049 | m68328_uart *uart = &uart_addr[info->line]; |
| 1050 | unsigned long flags; |
| 1051 | |
| 1052 | if (!info || serial_paranoia_check(info, tty->name, "rs_close")) |
| 1053 | return; |
| 1054 | |
Greg Ungerer | 727dda8 | 2006-06-28 15:54:22 +1000 | [diff] [blame] | 1055 | local_irq_save(flags); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1056 | |
| 1057 | if (tty_hung_up_p(filp)) { |
Greg Ungerer | 727dda8 | 2006-06-28 15:54:22 +1000 | [diff] [blame] | 1058 | local_irq_restore(flags); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1059 | return; |
| 1060 | } |
| 1061 | |
| 1062 | if ((tty->count == 1) && (info->count != 1)) { |
| 1063 | /* |
| 1064 | * Uh, oh. tty->count is 1, which means that the tty |
| 1065 | * structure will be freed. Info->count should always |
| 1066 | * be one in these conditions. If it's greater than |
| 1067 | * one, we've got real problems, since it means the |
| 1068 | * serial port won't be shutdown. |
| 1069 | */ |
| 1070 | printk("rs_close: bad serial port count; tty->count is 1, " |
| 1071 | "info->count is %d\n", info->count); |
| 1072 | info->count = 1; |
| 1073 | } |
| 1074 | if (--info->count < 0) { |
| 1075 | printk("rs_close: bad serial port count for ttyS%d: %d\n", |
| 1076 | info->line, info->count); |
| 1077 | info->count = 0; |
| 1078 | } |
| 1079 | if (info->count) { |
Greg Ungerer | 727dda8 | 2006-06-28 15:54:22 +1000 | [diff] [blame] | 1080 | local_irq_restore(flags); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1081 | return; |
| 1082 | } |
| 1083 | info->flags |= S_CLOSING; |
| 1084 | /* |
| 1085 | * Now we wait for the transmit buffer to clear; and we notify |
| 1086 | * the line discipline to only process XON/XOFF characters. |
| 1087 | */ |
| 1088 | tty->closing = 1; |
| 1089 | if (info->closing_wait != S_CLOSING_WAIT_NONE) |
| 1090 | tty_wait_until_sent(tty, info->closing_wait); |
| 1091 | /* |
| 1092 | * At this point we stop accepting input. To do this, we |
| 1093 | * disable the receive line status interrupts, and tell the |
| 1094 | * interrupt driver to stop checking the data ready bit in the |
| 1095 | * line status register. |
| 1096 | */ |
| 1097 | |
| 1098 | uart->ustcnt &= ~USTCNT_RXEN; |
| 1099 | uart->ustcnt &= ~(USTCNT_RXEN | USTCNT_RX_INTR_MASK); |
| 1100 | |
| 1101 | shutdown(info); |
Alan Cox | 978e595 | 2008-04-30 00:53:59 -0700 | [diff] [blame] | 1102 | rs_flush_buffer(tty); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1103 | |
| 1104 | tty_ldisc_flush(tty); |
| 1105 | tty->closing = 0; |
| 1106 | info->event = 0; |
Takashi Iwai | a88487c | 2008-07-16 21:54:42 +0100 | [diff] [blame] | 1107 | info->port.tty = NULL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1108 | #warning "This is not and has never been valid so fix it" |
| 1109 | #if 0 |
| 1110 | if (tty->ldisc.num != ldiscs[N_TTY].num) { |
| 1111 | if (tty->ldisc.close) |
| 1112 | (tty->ldisc.close)(tty); |
| 1113 | tty->ldisc = ldiscs[N_TTY]; |
| 1114 | tty->termios->c_line = N_TTY; |
| 1115 | if (tty->ldisc.open) |
| 1116 | (tty->ldisc.open)(tty); |
| 1117 | } |
| 1118 | #endif |
| 1119 | if (info->blocked_open) { |
| 1120 | if (info->close_delay) { |
| 1121 | msleep_interruptible(jiffies_to_msecs(info->close_delay)); |
| 1122 | } |
| 1123 | wake_up_interruptible(&info->open_wait); |
| 1124 | } |
| 1125 | info->flags &= ~(S_NORMAL_ACTIVE|S_CLOSING); |
| 1126 | wake_up_interruptible(&info->close_wait); |
Greg Ungerer | 727dda8 | 2006-06-28 15:54:22 +1000 | [diff] [blame] | 1127 | local_irq_restore(flags); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1128 | } |
| 1129 | |
| 1130 | /* |
| 1131 | * rs_hangup() --- called by tty_hangup() when a hangup is signaled. |
| 1132 | */ |
| 1133 | void rs_hangup(struct tty_struct *tty) |
| 1134 | { |
| 1135 | struct m68k_serial * info = (struct m68k_serial *)tty->driver_data; |
| 1136 | |
| 1137 | if (serial_paranoia_check(info, tty->name, "rs_hangup")) |
| 1138 | return; |
| 1139 | |
| 1140 | rs_flush_buffer(tty); |
| 1141 | shutdown(info); |
| 1142 | info->event = 0; |
| 1143 | info->count = 0; |
| 1144 | info->flags &= ~S_NORMAL_ACTIVE; |
Takashi Iwai | a88487c | 2008-07-16 21:54:42 +0100 | [diff] [blame] | 1145 | info->port.tty = NULL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1146 | wake_up_interruptible(&info->open_wait); |
| 1147 | } |
| 1148 | |
| 1149 | /* |
| 1150 | * ------------------------------------------------------------ |
| 1151 | * rs_open() and friends |
| 1152 | * ------------------------------------------------------------ |
| 1153 | */ |
| 1154 | static int block_til_ready(struct tty_struct *tty, struct file * filp, |
| 1155 | struct m68k_serial *info) |
| 1156 | { |
| 1157 | DECLARE_WAITQUEUE(wait, current); |
| 1158 | int retval; |
| 1159 | int do_clocal = 0; |
| 1160 | |
| 1161 | /* |
| 1162 | * If the device is in the middle of being closed, then block |
| 1163 | * until it's done, and then try again. |
| 1164 | */ |
| 1165 | if (info->flags & S_CLOSING) { |
| 1166 | interruptible_sleep_on(&info->close_wait); |
| 1167 | #ifdef SERIAL_DO_RESTART |
| 1168 | if (info->flags & S_HUP_NOTIFY) |
| 1169 | return -EAGAIN; |
| 1170 | else |
| 1171 | return -ERESTARTSYS; |
| 1172 | #else |
| 1173 | return -EAGAIN; |
| 1174 | #endif |
| 1175 | } |
| 1176 | |
| 1177 | /* |
| 1178 | * If non-blocking mode is set, or the port is not enabled, |
| 1179 | * then make the check up front and then exit. |
| 1180 | */ |
| 1181 | if ((filp->f_flags & O_NONBLOCK) || |
| 1182 | (tty->flags & (1 << TTY_IO_ERROR))) { |
| 1183 | info->flags |= S_NORMAL_ACTIVE; |
| 1184 | return 0; |
| 1185 | } |
| 1186 | |
| 1187 | if (tty->termios->c_cflag & CLOCAL) |
| 1188 | do_clocal = 1; |
| 1189 | |
| 1190 | /* |
| 1191 | * Block waiting for the carrier detect and the line to become |
| 1192 | * free (i.e., not in use by the callout). While we are in |
| 1193 | * this loop, info->count is dropped by one, so that |
| 1194 | * rs_close() knows when to free things. We restore it upon |
| 1195 | * exit, either normal or abnormal. |
| 1196 | */ |
| 1197 | retval = 0; |
| 1198 | add_wait_queue(&info->open_wait, &wait); |
| 1199 | |
| 1200 | info->count--; |
| 1201 | info->blocked_open++; |
| 1202 | while (1) { |
Greg Ungerer | 727dda8 | 2006-06-28 15:54:22 +1000 | [diff] [blame] | 1203 | local_irq_disable(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1204 | m68k_rtsdtr(info, 1); |
Greg Ungerer | 727dda8 | 2006-06-28 15:54:22 +1000 | [diff] [blame] | 1205 | local_irq_enable(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1206 | current->state = TASK_INTERRUPTIBLE; |
| 1207 | if (tty_hung_up_p(filp) || |
| 1208 | !(info->flags & S_INITIALIZED)) { |
| 1209 | #ifdef SERIAL_DO_RESTART |
| 1210 | if (info->flags & S_HUP_NOTIFY) |
| 1211 | retval = -EAGAIN; |
| 1212 | else |
| 1213 | retval = -ERESTARTSYS; |
| 1214 | #else |
| 1215 | retval = -EAGAIN; |
| 1216 | #endif |
| 1217 | break; |
| 1218 | } |
| 1219 | if (!(info->flags & S_CLOSING) && do_clocal) |
| 1220 | break; |
| 1221 | if (signal_pending(current)) { |
| 1222 | retval = -ERESTARTSYS; |
| 1223 | break; |
| 1224 | } |
Arnd Bergmann | e142a31 | 2010-06-01 22:53:10 +0200 | [diff] [blame] | 1225 | tty_unlock(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1226 | schedule(); |
Arnd Bergmann | e142a31 | 2010-06-01 22:53:10 +0200 | [diff] [blame] | 1227 | tty_lock(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1228 | } |
| 1229 | current->state = TASK_RUNNING; |
| 1230 | remove_wait_queue(&info->open_wait, &wait); |
| 1231 | if (!tty_hung_up_p(filp)) |
| 1232 | info->count++; |
| 1233 | info->blocked_open--; |
| 1234 | |
| 1235 | if (retval) |
| 1236 | return retval; |
| 1237 | info->flags |= S_NORMAL_ACTIVE; |
| 1238 | return 0; |
| 1239 | } |
| 1240 | |
| 1241 | /* |
| 1242 | * This routine is called whenever a serial port is opened. It |
| 1243 | * enables interrupts for a serial port, linking in its S structure into |
| 1244 | * the IRQ chain. It also performs the serial-specific |
| 1245 | * initialization for the tty structure. |
| 1246 | */ |
| 1247 | int rs_open(struct tty_struct *tty, struct file * filp) |
| 1248 | { |
| 1249 | struct m68k_serial *info; |
| 1250 | int retval, line; |
| 1251 | |
| 1252 | line = tty->index; |
| 1253 | |
| 1254 | if (line >= NR_PORTS || line < 0) /* we have exactly one */ |
| 1255 | return -ENODEV; |
| 1256 | |
| 1257 | info = &m68k_soft[line]; |
| 1258 | |
| 1259 | if (serial_paranoia_check(info, tty->name, "rs_open")) |
| 1260 | return -ENODEV; |
| 1261 | |
| 1262 | info->count++; |
| 1263 | tty->driver_data = info; |
Takashi Iwai | a88487c | 2008-07-16 21:54:42 +0100 | [diff] [blame] | 1264 | info->port.tty = tty; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1265 | |
| 1266 | /* |
| 1267 | * Start up serial port |
| 1268 | */ |
| 1269 | retval = startup(info); |
| 1270 | if (retval) |
| 1271 | return retval; |
| 1272 | |
| 1273 | return block_til_ready(tty, filp, info); |
| 1274 | } |
| 1275 | |
| 1276 | /* Finally, routines used to initialize the serial driver. */ |
| 1277 | |
| 1278 | static void show_serial_version(void) |
| 1279 | { |
| 1280 | printk("MC68328 serial driver version 1.00\n"); |
| 1281 | } |
| 1282 | |
Jeff Dike | b68e31d | 2006-10-02 02:17:18 -0700 | [diff] [blame] | 1283 | static const struct tty_operations rs_ops = { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1284 | .open = rs_open, |
| 1285 | .close = rs_close, |
| 1286 | .write = rs_write, |
| 1287 | .flush_chars = rs_flush_chars, |
| 1288 | .write_room = rs_write_room, |
| 1289 | .chars_in_buffer = rs_chars_in_buffer, |
| 1290 | .flush_buffer = rs_flush_buffer, |
| 1291 | .ioctl = rs_ioctl, |
| 1292 | .throttle = rs_throttle, |
| 1293 | .unthrottle = rs_unthrottle, |
| 1294 | .set_termios = rs_set_termios, |
| 1295 | .stop = rs_stop, |
| 1296 | .start = rs_start, |
| 1297 | .hangup = rs_hangup, |
| 1298 | .set_ldisc = rs_set_ldisc, |
| 1299 | }; |
| 1300 | |
| 1301 | /* rs_init inits the driver */ |
| 1302 | static int __init |
| 1303 | rs68328_init(void) |
| 1304 | { |
| 1305 | int flags, i; |
| 1306 | struct m68k_serial *info; |
| 1307 | |
| 1308 | serial_driver = alloc_tty_driver(NR_PORTS); |
| 1309 | if (!serial_driver) |
| 1310 | return -ENOMEM; |
| 1311 | |
| 1312 | show_serial_version(); |
| 1313 | |
| 1314 | /* Initialize the tty_driver structure */ |
| 1315 | /* SPARC: Not all of this is exactly right for us. */ |
| 1316 | |
| 1317 | serial_driver->name = "ttyS"; |
| 1318 | serial_driver->major = TTY_MAJOR; |
| 1319 | serial_driver->minor_start = 64; |
| 1320 | serial_driver->type = TTY_DRIVER_TYPE_SERIAL; |
| 1321 | serial_driver->subtype = SERIAL_TYPE_NORMAL; |
| 1322 | serial_driver->init_termios = tty_std_termios; |
| 1323 | serial_driver->init_termios.c_cflag = |
| 1324 | m68328_console_cbaud | CS8 | CREAD | HUPCL | CLOCAL; |
| 1325 | serial_driver->flags = TTY_DRIVER_REAL_RAW; |
| 1326 | tty_set_operations(serial_driver, &rs_ops); |
| 1327 | |
| 1328 | if (tty_register_driver(serial_driver)) { |
| 1329 | put_tty_driver(serial_driver); |
| 1330 | printk(KERN_ERR "Couldn't register serial driver\n"); |
| 1331 | return -ENOMEM; |
| 1332 | } |
| 1333 | |
Greg Ungerer | 727dda8 | 2006-06-28 15:54:22 +1000 | [diff] [blame] | 1334 | local_irq_save(flags); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1335 | |
| 1336 | for(i=0;i<NR_PORTS;i++) { |
| 1337 | |
| 1338 | info = &m68k_soft[i]; |
| 1339 | info->magic = SERIAL_MAGIC; |
| 1340 | info->port = (int) &uart_addr[i]; |
Takashi Iwai | a88487c | 2008-07-16 21:54:42 +0100 | [diff] [blame] | 1341 | info->port.tty = NULL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1342 | info->irq = uart_irqs[i]; |
| 1343 | info->custom_divisor = 16; |
| 1344 | info->close_delay = 50; |
| 1345 | info->closing_wait = 3000; |
| 1346 | info->x_char = 0; |
| 1347 | info->event = 0; |
| 1348 | info->count = 0; |
| 1349 | info->blocked_open = 0; |
Greg Ungerer | 931f9cd | 2007-07-25 22:07:20 +1000 | [diff] [blame] | 1350 | INIT_WORK(&info->tqueue, do_softint); |
| 1351 | INIT_WORK(&info->tqueue_hangup, do_serial_hangup); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1352 | init_waitqueue_head(&info->open_wait); |
| 1353 | init_waitqueue_head(&info->close_wait); |
| 1354 | info->line = i; |
| 1355 | info->is_cons = 1; /* Means shortcuts work */ |
| 1356 | |
| 1357 | printk("%s%d at 0x%08x (irq = %d)", serial_driver->name, info->line, |
| 1358 | info->port, info->irq); |
| 1359 | printk(" is a builtin MC68328 UART\n"); |
| 1360 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1361 | #ifdef CONFIG_M68VZ328 |
| 1362 | if (i > 0 ) |
| 1363 | PJSEL &= 0xCF; /* PSW enable second port output */ |
| 1364 | #endif |
| 1365 | |
| 1366 | if (request_irq(uart_irqs[i], |
| 1367 | rs_interrupt, |
Greg Ungerer | 7c74806 | 2008-02-01 17:38:32 +1000 | [diff] [blame] | 1368 | IRQF_DISABLED, |
Alan Cox | 25db8ad | 2008-08-19 20:49:40 -0700 | [diff] [blame] | 1369 | "M68328_UART", info)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1370 | panic("Unable to attach 68328 serial interrupt\n"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1371 | } |
Greg Ungerer | 727dda8 | 2006-06-28 15:54:22 +1000 | [diff] [blame] | 1372 | local_irq_restore(flags); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1373 | return 0; |
| 1374 | } |
| 1375 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1376 | module_init(rs68328_init); |
| 1377 | |
| 1378 | |
| 1379 | |
| 1380 | static void m68328_set_baud(void) |
| 1381 | { |
| 1382 | unsigned short ustcnt; |
| 1383 | int i; |
| 1384 | |
| 1385 | ustcnt = USTCNT; |
| 1386 | USTCNT = ustcnt & ~USTCNT_TXEN; |
| 1387 | |
| 1388 | again: |
Thiago Farina | 8b505ca | 2009-12-09 12:31:30 -0800 | [diff] [blame] | 1389 | for (i = 0; i < ARRAY_SIZE(baud_table); i++) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1390 | if (baud_table[i] == m68328_console_baud) |
| 1391 | break; |
Thiago Farina | 8b505ca | 2009-12-09 12:31:30 -0800 | [diff] [blame] | 1392 | if (i >= ARRAY_SIZE(baud_table)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1393 | m68328_console_baud = 9600; |
| 1394 | goto again; |
| 1395 | } |
| 1396 | |
| 1397 | UBAUD = PUT_FIELD(UBAUD_DIVIDE, hw_baud_table[i].divisor) | |
| 1398 | PUT_FIELD(UBAUD_PRESCALER, hw_baud_table[i].prescale); |
| 1399 | ustcnt &= ~(USTCNT_PARITYEN | USTCNT_ODD_EVEN | USTCNT_STOP | USTCNT_8_7); |
| 1400 | ustcnt |= USTCNT_8_7; |
| 1401 | ustcnt |= USTCNT_TXEN; |
| 1402 | USTCNT = ustcnt; |
| 1403 | m68328_console_initted = 1; |
| 1404 | return; |
| 1405 | } |
| 1406 | |
| 1407 | |
| 1408 | int m68328_console_setup(struct console *cp, char *arg) |
| 1409 | { |
| 1410 | int i, n = CONSOLE_BAUD_RATE; |
| 1411 | |
| 1412 | if (!cp) |
| 1413 | return(-1); |
| 1414 | |
| 1415 | if (arg) |
| 1416 | n = simple_strtoul(arg,NULL,0); |
| 1417 | |
Thiago Farina | 8b505ca | 2009-12-09 12:31:30 -0800 | [diff] [blame] | 1418 | for (i = 0; i < ARRAY_SIZE(baud_table); i++) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1419 | if (baud_table[i] == n) |
| 1420 | break; |
Greg Ungerer | e9a137c | 2010-05-24 14:32:55 -0700 | [diff] [blame] | 1421 | if (i < ARRAY_SIZE(baud_table)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1422 | m68328_console_baud = n; |
| 1423 | m68328_console_cbaud = 0; |
| 1424 | if (i > 15) { |
| 1425 | m68328_console_cbaud |= CBAUDEX; |
| 1426 | i -= 15; |
| 1427 | } |
| 1428 | m68328_console_cbaud |= i; |
| 1429 | } |
| 1430 | |
| 1431 | m68328_set_baud(); /* make sure baud rate changes */ |
| 1432 | return(0); |
| 1433 | } |
| 1434 | |
| 1435 | |
| 1436 | static struct tty_driver *m68328_console_device(struct console *c, int *index) |
| 1437 | { |
| 1438 | *index = c->index; |
| 1439 | return serial_driver; |
| 1440 | } |
| 1441 | |
| 1442 | |
| 1443 | void m68328_console_write (struct console *co, const char *str, |
| 1444 | unsigned int count) |
| 1445 | { |
| 1446 | if (!m68328_console_initted) |
| 1447 | m68328_set_baud(); |
| 1448 | while (count--) { |
| 1449 | if (*str == '\n') |
| 1450 | rs_put_char('\r'); |
| 1451 | rs_put_char( *str++ ); |
| 1452 | } |
| 1453 | } |
| 1454 | |
| 1455 | |
| 1456 | static struct console m68328_driver = { |
| 1457 | .name = "ttyS", |
| 1458 | .write = m68328_console_write, |
| 1459 | .device = m68328_console_device, |
| 1460 | .setup = m68328_console_setup, |
| 1461 | .flags = CON_PRINTBUFFER, |
| 1462 | .index = -1, |
| 1463 | }; |
| 1464 | |
| 1465 | |
| 1466 | static int __init m68328_console_init(void) |
| 1467 | { |
| 1468 | register_console(&m68328_driver); |
| 1469 | return 0; |
| 1470 | } |
| 1471 | |
| 1472 | console_initcall(m68328_console_init); |