David S. Miller | 02fd473 | 2006-02-11 02:25:21 -0800 | [diff] [blame] | 1 | /* sunhv.c: Serial driver for SUN4V hypervisor console. |
| 2 | * |
David S. Miller | c7754d4 | 2007-05-15 17:03:54 -0700 | [diff] [blame] | 3 | * Copyright (C) 2006, 2007 David S. Miller (davem@davemloft.net) |
David S. Miller | 02fd473 | 2006-02-11 02:25:21 -0800 | [diff] [blame] | 4 | */ |
| 5 | |
| 6 | #include <linux/module.h> |
| 7 | #include <linux/kernel.h> |
| 8 | #include <linux/errno.h> |
| 9 | #include <linux/tty.h> |
| 10 | #include <linux/tty_flip.h> |
| 11 | #include <linux/major.h> |
| 12 | #include <linux/circ_buf.h> |
| 13 | #include <linux/serial.h> |
| 14 | #include <linux/sysrq.h> |
| 15 | #include <linux/console.h> |
| 16 | #include <linux/spinlock.h> |
| 17 | #include <linux/slab.h> |
| 18 | #include <linux/delay.h> |
| 19 | #include <linux/init.h> |
| 20 | |
| 21 | #include <asm/hypervisor.h> |
| 22 | #include <asm/spitfire.h> |
David S. Miller | 93872ba | 2006-06-30 00:00:22 -0700 | [diff] [blame] | 23 | #include <asm/prom.h> |
| 24 | #include <asm/of_device.h> |
David S. Miller | f4266ab | 2006-02-13 20:43:02 -0800 | [diff] [blame] | 25 | #include <asm/irq.h> |
David S. Miller | 02fd473 | 2006-02-11 02:25:21 -0800 | [diff] [blame] | 26 | |
| 27 | #if defined(CONFIG_MAGIC_SYSRQ) |
| 28 | #define SUPPORT_SYSRQ |
| 29 | #endif |
| 30 | |
| 31 | #include <linux/serial_core.h> |
| 32 | |
| 33 | #include "suncore.h" |
| 34 | |
| 35 | #define CON_BREAK ((long)-1) |
| 36 | #define CON_HUP ((long)-2) |
| 37 | |
David S. Miller | 02fd473 | 2006-02-11 02:25:21 -0800 | [diff] [blame] | 38 | #define IGNORE_BREAK 0x1 |
| 39 | #define IGNORE_ALL 0x2 |
| 40 | |
David S. Miller | c7754d4 | 2007-05-15 17:03:54 -0700 | [diff] [blame] | 41 | static char *con_write_page; |
| 42 | static char *con_read_page; |
| 43 | |
David S. Miller | 02fd473 | 2006-02-11 02:25:21 -0800 | [diff] [blame] | 44 | static int hung_up = 0; |
| 45 | |
David S. Miller | c7754d4 | 2007-05-15 17:03:54 -0700 | [diff] [blame] | 46 | static void transmit_chars_putchar(struct uart_port *port, struct circ_buf *xmit) |
David S. Miller | 02fd473 | 2006-02-11 02:25:21 -0800 | [diff] [blame] | 47 | { |
David S. Miller | c7754d4 | 2007-05-15 17:03:54 -0700 | [diff] [blame] | 48 | while (!uart_circ_empty(xmit)) { |
| 49 | long status = sun4v_con_putchar(xmit->buf[xmit->tail]); |
| 50 | |
| 51 | if (status != HV_EOK) |
| 52 | break; |
| 53 | |
| 54 | xmit->tail = (xmit->tail + 1) & (UART_XMIT_SIZE - 1); |
| 55 | port->icount.tx++; |
| 56 | } |
| 57 | } |
| 58 | |
| 59 | static void transmit_chars_write(struct uart_port *port, struct circ_buf *xmit) |
| 60 | { |
| 61 | while (!uart_circ_empty(xmit)) { |
| 62 | unsigned long ra = __pa(xmit->buf + xmit->tail); |
| 63 | unsigned long len, status, sent; |
| 64 | |
| 65 | len = CIRC_CNT_TO_END(xmit->head, xmit->tail, |
| 66 | UART_XMIT_SIZE); |
| 67 | status = sun4v_con_write(ra, len, &sent); |
| 68 | if (status != HV_EOK) |
| 69 | break; |
| 70 | xmit->tail = (xmit->tail + sent) & (UART_XMIT_SIZE - 1); |
| 71 | port->icount.tx += sent; |
| 72 | } |
| 73 | } |
| 74 | |
| 75 | static int receive_chars_getchar(struct uart_port *port, struct tty_struct *tty) |
| 76 | { |
David S. Miller | 02fd473 | 2006-02-11 02:25:21 -0800 | [diff] [blame] | 77 | int saw_console_brk = 0; |
| 78 | int limit = 10000; |
| 79 | |
David S. Miller | 02fd473 | 2006-02-11 02:25:21 -0800 | [diff] [blame] | 80 | while (limit-- > 0) { |
| 81 | long status; |
David S. Miller | c7754d4 | 2007-05-15 17:03:54 -0700 | [diff] [blame] | 82 | long c = sun4v_con_getchar(&status); |
David S. Miller | 02fd473 | 2006-02-11 02:25:21 -0800 | [diff] [blame] | 83 | |
| 84 | if (status == HV_EWOULDBLOCK) |
| 85 | break; |
| 86 | |
| 87 | if (c == CON_BREAK) { |
David S. Miller | 135066a | 2006-02-16 00:42:21 -0800 | [diff] [blame] | 88 | if (uart_handle_break(port)) |
| 89 | continue; |
David S. Miller | 02fd473 | 2006-02-11 02:25:21 -0800 | [diff] [blame] | 90 | saw_console_brk = 1; |
| 91 | c = 0; |
| 92 | } |
| 93 | |
| 94 | if (c == CON_HUP) { |
| 95 | hung_up = 1; |
| 96 | uart_handle_dcd_change(port, 0); |
| 97 | } else if (hung_up) { |
| 98 | hung_up = 0; |
| 99 | uart_handle_dcd_change(port, 1); |
| 100 | } |
| 101 | |
| 102 | if (tty == NULL) { |
David Howells | 7d12e78 | 2006-10-05 14:55:46 +0100 | [diff] [blame] | 103 | uart_handle_sysrq_char(port, c); |
David S. Miller | 02fd473 | 2006-02-11 02:25:21 -0800 | [diff] [blame] | 104 | continue; |
| 105 | } |
| 106 | |
David S. Miller | 02fd473 | 2006-02-11 02:25:21 -0800 | [diff] [blame] | 107 | port->icount.rx++; |
David S. Miller | 02fd473 | 2006-02-11 02:25:21 -0800 | [diff] [blame] | 108 | |
David Howells | 7d12e78 | 2006-10-05 14:55:46 +0100 | [diff] [blame] | 109 | if (uart_handle_sysrq_char(port, c)) |
David S. Miller | 02fd473 | 2006-02-11 02:25:21 -0800 | [diff] [blame] | 110 | continue; |
| 111 | |
David S. Miller | c7754d4 | 2007-05-15 17:03:54 -0700 | [diff] [blame] | 112 | tty_insert_flip_char(tty, c, TTY_NORMAL); |
David S. Miller | 02fd473 | 2006-02-11 02:25:21 -0800 | [diff] [blame] | 113 | } |
| 114 | |
David S. Miller | c7754d4 | 2007-05-15 17:03:54 -0700 | [diff] [blame] | 115 | return saw_console_brk; |
| 116 | } |
| 117 | |
| 118 | static int receive_chars_read(struct uart_port *port, struct tty_struct *tty) |
| 119 | { |
| 120 | int saw_console_brk = 0; |
| 121 | int limit = 10000; |
| 122 | |
| 123 | while (limit-- > 0) { |
| 124 | unsigned long ra = __pa(con_read_page); |
| 125 | unsigned long bytes_read, i; |
| 126 | long stat = sun4v_con_read(ra, PAGE_SIZE, &bytes_read); |
| 127 | |
| 128 | if (stat != HV_EOK) { |
| 129 | bytes_read = 0; |
| 130 | |
| 131 | if (stat == CON_BREAK) { |
| 132 | if (uart_handle_break(port)) |
| 133 | continue; |
| 134 | saw_console_brk = 1; |
| 135 | *con_read_page = 0; |
| 136 | bytes_read = 1; |
| 137 | } else if (stat == CON_HUP) { |
| 138 | hung_up = 1; |
| 139 | uart_handle_dcd_change(port, 0); |
| 140 | continue; |
| 141 | } else { |
| 142 | /* HV_EWOULDBLOCK, etc. */ |
| 143 | break; |
| 144 | } |
| 145 | } |
| 146 | |
| 147 | if (hung_up) { |
| 148 | hung_up = 0; |
| 149 | uart_handle_dcd_change(port, 1); |
| 150 | } |
| 151 | |
| 152 | for (i = 0; i < bytes_read; i++) |
| 153 | uart_handle_sysrq_char(port, con_read_page[i]); |
| 154 | |
| 155 | if (tty == NULL) |
| 156 | continue; |
| 157 | |
| 158 | port->icount.rx += bytes_read; |
| 159 | |
| 160 | tty_insert_flip_string(tty, con_read_page, bytes_read); |
| 161 | } |
| 162 | |
| 163 | return saw_console_brk; |
| 164 | } |
| 165 | |
| 166 | struct sunhv_ops { |
| 167 | void (*transmit_chars)(struct uart_port *port, struct circ_buf *xmit); |
| 168 | int (*receive_chars)(struct uart_port *port, struct tty_struct *tty); |
| 169 | }; |
| 170 | |
| 171 | static struct sunhv_ops bychar_ops = { |
| 172 | .transmit_chars = transmit_chars_putchar, |
| 173 | .receive_chars = receive_chars_getchar, |
| 174 | }; |
| 175 | |
| 176 | static struct sunhv_ops bywrite_ops = { |
| 177 | .transmit_chars = transmit_chars_write, |
| 178 | .receive_chars = receive_chars_read, |
| 179 | }; |
| 180 | |
| 181 | static struct sunhv_ops *sunhv_ops = &bychar_ops; |
| 182 | |
| 183 | static struct tty_struct *receive_chars(struct uart_port *port) |
| 184 | { |
| 185 | struct tty_struct *tty = NULL; |
| 186 | |
| 187 | if (port->info != NULL) /* Unopened serial console */ |
Stephen Rothwell | 2f7a697 | 2008-07-16 21:54:11 +0100 | [diff] [blame] | 188 | tty = port->info->port.tty; |
David S. Miller | c7754d4 | 2007-05-15 17:03:54 -0700 | [diff] [blame] | 189 | |
| 190 | if (sunhv_ops->receive_chars(port, tty)) |
David S. Miller | 02fd473 | 2006-02-11 02:25:21 -0800 | [diff] [blame] | 191 | sun_do_break(); |
| 192 | |
| 193 | return tty; |
| 194 | } |
| 195 | |
| 196 | static void transmit_chars(struct uart_port *port) |
| 197 | { |
David S. Miller | db33f9b | 2006-02-15 21:56:49 -0800 | [diff] [blame] | 198 | struct circ_buf *xmit; |
David S. Miller | 02fd473 | 2006-02-11 02:25:21 -0800 | [diff] [blame] | 199 | |
David S. Miller | db33f9b | 2006-02-15 21:56:49 -0800 | [diff] [blame] | 200 | if (!port->info) |
| 201 | return; |
| 202 | |
| 203 | xmit = &port->info->xmit; |
David S. Miller | 02fd473 | 2006-02-11 02:25:21 -0800 | [diff] [blame] | 204 | if (uart_circ_empty(xmit) || uart_tx_stopped(port)) |
| 205 | return; |
| 206 | |
David S. Miller | c7754d4 | 2007-05-15 17:03:54 -0700 | [diff] [blame] | 207 | sunhv_ops->transmit_chars(port, xmit); |
David S. Miller | 02fd473 | 2006-02-11 02:25:21 -0800 | [diff] [blame] | 208 | |
| 209 | if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS) |
| 210 | uart_write_wakeup(port); |
| 211 | } |
| 212 | |
David Howells | 7d12e78 | 2006-10-05 14:55:46 +0100 | [diff] [blame] | 213 | static irqreturn_t sunhv_interrupt(int irq, void *dev_id) |
David S. Miller | 02fd473 | 2006-02-11 02:25:21 -0800 | [diff] [blame] | 214 | { |
| 215 | struct uart_port *port = dev_id; |
| 216 | struct tty_struct *tty; |
| 217 | unsigned long flags; |
| 218 | |
| 219 | spin_lock_irqsave(&port->lock, flags); |
David Howells | 7d12e78 | 2006-10-05 14:55:46 +0100 | [diff] [blame] | 220 | tty = receive_chars(port); |
David S. Miller | 02fd473 | 2006-02-11 02:25:21 -0800 | [diff] [blame] | 221 | transmit_chars(port); |
| 222 | spin_unlock_irqrestore(&port->lock, flags); |
| 223 | |
| 224 | if (tty) |
| 225 | tty_flip_buffer_push(tty); |
| 226 | |
| 227 | return IRQ_HANDLED; |
| 228 | } |
| 229 | |
| 230 | /* port->lock is not held. */ |
| 231 | static unsigned int sunhv_tx_empty(struct uart_port *port) |
| 232 | { |
| 233 | /* Transmitter is always empty for us. If the circ buffer |
| 234 | * is non-empty or there is an x_char pending, our caller |
| 235 | * will do the right thing and ignore what we return here. |
| 236 | */ |
| 237 | return TIOCSER_TEMT; |
| 238 | } |
| 239 | |
| 240 | /* port->lock held by caller. */ |
| 241 | static void sunhv_set_mctrl(struct uart_port *port, unsigned int mctrl) |
| 242 | { |
| 243 | return; |
| 244 | } |
| 245 | |
| 246 | /* port->lock is held by caller and interrupts are disabled. */ |
| 247 | static unsigned int sunhv_get_mctrl(struct uart_port *port) |
| 248 | { |
| 249 | return TIOCM_DSR | TIOCM_CAR | TIOCM_CTS; |
| 250 | } |
| 251 | |
| 252 | /* port->lock held by caller. */ |
| 253 | static void sunhv_stop_tx(struct uart_port *port) |
| 254 | { |
| 255 | return; |
| 256 | } |
| 257 | |
| 258 | /* port->lock held by caller. */ |
| 259 | static void sunhv_start_tx(struct uart_port *port) |
| 260 | { |
David S. Miller | f798634 | 2007-07-16 17:05:11 -0700 | [diff] [blame] | 261 | transmit_chars(port); |
David S. Miller | 02fd473 | 2006-02-11 02:25:21 -0800 | [diff] [blame] | 262 | } |
| 263 | |
| 264 | /* port->lock is not held. */ |
| 265 | static void sunhv_send_xchar(struct uart_port *port, char ch) |
| 266 | { |
| 267 | unsigned long flags; |
| 268 | int limit = 10000; |
| 269 | |
| 270 | spin_lock_irqsave(&port->lock, flags); |
| 271 | |
| 272 | while (limit-- > 0) { |
David S. Miller | c7754d4 | 2007-05-15 17:03:54 -0700 | [diff] [blame] | 273 | long status = sun4v_con_putchar(ch); |
David S. Miller | 02fd473 | 2006-02-11 02:25:21 -0800 | [diff] [blame] | 274 | if (status == HV_EOK) |
| 275 | break; |
David S. Miller | c7754d4 | 2007-05-15 17:03:54 -0700 | [diff] [blame] | 276 | udelay(1); |
David S. Miller | 02fd473 | 2006-02-11 02:25:21 -0800 | [diff] [blame] | 277 | } |
| 278 | |
| 279 | spin_unlock_irqrestore(&port->lock, flags); |
| 280 | } |
| 281 | |
| 282 | /* port->lock held by caller. */ |
| 283 | static void sunhv_stop_rx(struct uart_port *port) |
| 284 | { |
| 285 | } |
| 286 | |
| 287 | /* port->lock held by caller. */ |
| 288 | static void sunhv_enable_ms(struct uart_port *port) |
| 289 | { |
| 290 | } |
| 291 | |
| 292 | /* port->lock is not held. */ |
| 293 | static void sunhv_break_ctl(struct uart_port *port, int break_state) |
| 294 | { |
| 295 | if (break_state) { |
| 296 | unsigned long flags; |
David S. Miller | c7754d4 | 2007-05-15 17:03:54 -0700 | [diff] [blame] | 297 | int limit = 10000; |
David S. Miller | 02fd473 | 2006-02-11 02:25:21 -0800 | [diff] [blame] | 298 | |
| 299 | spin_lock_irqsave(&port->lock, flags); |
| 300 | |
| 301 | while (limit-- > 0) { |
David S. Miller | c7754d4 | 2007-05-15 17:03:54 -0700 | [diff] [blame] | 302 | long status = sun4v_con_putchar(CON_BREAK); |
David S. Miller | 02fd473 | 2006-02-11 02:25:21 -0800 | [diff] [blame] | 303 | if (status == HV_EOK) |
| 304 | break; |
David S. Miller | c7754d4 | 2007-05-15 17:03:54 -0700 | [diff] [blame] | 305 | udelay(1); |
David S. Miller | 02fd473 | 2006-02-11 02:25:21 -0800 | [diff] [blame] | 306 | } |
| 307 | |
| 308 | spin_unlock_irqrestore(&port->lock, flags); |
| 309 | } |
| 310 | } |
| 311 | |
| 312 | /* port->lock is not held. */ |
| 313 | static int sunhv_startup(struct uart_port *port) |
| 314 | { |
| 315 | return 0; |
| 316 | } |
| 317 | |
| 318 | /* port->lock is not held. */ |
| 319 | static void sunhv_shutdown(struct uart_port *port) |
| 320 | { |
| 321 | } |
| 322 | |
| 323 | /* port->lock is not held. */ |
Alan Cox | 606d099 | 2006-12-08 02:38:45 -0800 | [diff] [blame] | 324 | static void sunhv_set_termios(struct uart_port *port, struct ktermios *termios, |
| 325 | struct ktermios *old) |
David S. Miller | 02fd473 | 2006-02-11 02:25:21 -0800 | [diff] [blame] | 326 | { |
| 327 | unsigned int baud = uart_get_baud_rate(port, termios, old, 0, 4000000); |
| 328 | unsigned int quot = uart_get_divisor(port, baud); |
| 329 | unsigned int iflag, cflag; |
| 330 | unsigned long flags; |
| 331 | |
| 332 | spin_lock_irqsave(&port->lock, flags); |
| 333 | |
| 334 | iflag = termios->c_iflag; |
| 335 | cflag = termios->c_cflag; |
| 336 | |
| 337 | port->ignore_status_mask = 0; |
| 338 | if (iflag & IGNBRK) |
| 339 | port->ignore_status_mask |= IGNORE_BREAK; |
| 340 | if ((cflag & CREAD) == 0) |
| 341 | port->ignore_status_mask |= IGNORE_ALL; |
| 342 | |
| 343 | /* XXX */ |
| 344 | uart_update_timeout(port, cflag, |
| 345 | (port->uartclk / (16 * quot))); |
| 346 | |
| 347 | spin_unlock_irqrestore(&port->lock, flags); |
| 348 | } |
| 349 | |
| 350 | static const char *sunhv_type(struct uart_port *port) |
| 351 | { |
| 352 | return "SUN4V HCONS"; |
| 353 | } |
| 354 | |
| 355 | static void sunhv_release_port(struct uart_port *port) |
| 356 | { |
| 357 | } |
| 358 | |
| 359 | static int sunhv_request_port(struct uart_port *port) |
| 360 | { |
| 361 | return 0; |
| 362 | } |
| 363 | |
| 364 | static void sunhv_config_port(struct uart_port *port, int flags) |
| 365 | { |
| 366 | } |
| 367 | |
| 368 | static int sunhv_verify_port(struct uart_port *port, struct serial_struct *ser) |
| 369 | { |
| 370 | return -EINVAL; |
| 371 | } |
| 372 | |
| 373 | static struct uart_ops sunhv_pops = { |
| 374 | .tx_empty = sunhv_tx_empty, |
| 375 | .set_mctrl = sunhv_set_mctrl, |
| 376 | .get_mctrl = sunhv_get_mctrl, |
| 377 | .stop_tx = sunhv_stop_tx, |
| 378 | .start_tx = sunhv_start_tx, |
| 379 | .send_xchar = sunhv_send_xchar, |
| 380 | .stop_rx = sunhv_stop_rx, |
| 381 | .enable_ms = sunhv_enable_ms, |
| 382 | .break_ctl = sunhv_break_ctl, |
| 383 | .startup = sunhv_startup, |
| 384 | .shutdown = sunhv_shutdown, |
| 385 | .set_termios = sunhv_set_termios, |
| 386 | .type = sunhv_type, |
| 387 | .release_port = sunhv_release_port, |
| 388 | .request_port = sunhv_request_port, |
| 389 | .config_port = sunhv_config_port, |
| 390 | .verify_port = sunhv_verify_port, |
| 391 | }; |
| 392 | |
| 393 | static struct uart_driver sunhv_reg = { |
| 394 | .owner = THIS_MODULE, |
David S. Miller | 32039f4 | 2008-05-01 01:14:27 -0700 | [diff] [blame] | 395 | .driver_name = "sunhv", |
David S. Miller | 02fd473 | 2006-02-11 02:25:21 -0800 | [diff] [blame] | 396 | .dev_name = "ttyS", |
| 397 | .major = TTY_MAJOR, |
| 398 | }; |
| 399 | |
| 400 | static struct uart_port *sunhv_port; |
| 401 | |
David S. Miller | c7754d4 | 2007-05-15 17:03:54 -0700 | [diff] [blame] | 402 | /* Copy 's' into the con_write_page, decoding "\n" into |
| 403 | * "\r\n" along the way. We have to return two lengths |
| 404 | * because the caller needs to know how much to advance |
| 405 | * 's' and also how many bytes to output via con_write_page. |
| 406 | */ |
| 407 | static int fill_con_write_page(const char *s, unsigned int n, |
| 408 | unsigned long *page_bytes) |
David S. Miller | 02fd473 | 2006-02-11 02:25:21 -0800 | [diff] [blame] | 409 | { |
David S. Miller | c7754d4 | 2007-05-15 17:03:54 -0700 | [diff] [blame] | 410 | const char *orig_s = s; |
| 411 | char *p = con_write_page; |
| 412 | int left = PAGE_SIZE; |
| 413 | |
| 414 | while (n--) { |
| 415 | if (*s == '\n') { |
| 416 | if (left < 2) |
| 417 | break; |
| 418 | *p++ = '\r'; |
| 419 | left--; |
| 420 | } else if (left < 1) |
| 421 | break; |
| 422 | *p++ = *s++; |
| 423 | left--; |
| 424 | } |
| 425 | *page_bytes = p - con_write_page; |
| 426 | return s - orig_s; |
| 427 | } |
| 428 | |
| 429 | static void sunhv_console_write_paged(struct console *con, const char *s, unsigned n) |
| 430 | { |
| 431 | struct uart_port *port = sunhv_port; |
David S. Miller | 02fd473 | 2006-02-11 02:25:21 -0800 | [diff] [blame] | 432 | unsigned long flags; |
David S. Miller | f3c681c | 2007-07-15 23:53:32 -0700 | [diff] [blame] | 433 | int locked = 1; |
David S. Miller | 02fd473 | 2006-02-11 02:25:21 -0800 | [diff] [blame] | 434 | |
David S. Miller | f3c681c | 2007-07-15 23:53:32 -0700 | [diff] [blame] | 435 | local_irq_save(flags); |
| 436 | if (port->sysrq) { |
| 437 | locked = 0; |
| 438 | } else if (oops_in_progress) { |
| 439 | locked = spin_trylock(&port->lock); |
| 440 | } else |
| 441 | spin_lock(&port->lock); |
| 442 | |
David S. Miller | c7754d4 | 2007-05-15 17:03:54 -0700 | [diff] [blame] | 443 | while (n > 0) { |
| 444 | unsigned long ra = __pa(con_write_page); |
| 445 | unsigned long page_bytes; |
| 446 | unsigned int cpy = fill_con_write_page(s, n, |
| 447 | &page_bytes); |
David S. Miller | 02fd473 | 2006-02-11 02:25:21 -0800 | [diff] [blame] | 448 | |
David S. Miller | c7754d4 | 2007-05-15 17:03:54 -0700 | [diff] [blame] | 449 | n -= cpy; |
| 450 | s += cpy; |
| 451 | while (page_bytes > 0) { |
| 452 | unsigned long written; |
| 453 | int limit = 1000000; |
| 454 | |
| 455 | while (limit--) { |
| 456 | unsigned long stat; |
| 457 | |
| 458 | stat = sun4v_con_write(ra, page_bytes, |
| 459 | &written); |
| 460 | if (stat == HV_EOK) |
| 461 | break; |
| 462 | udelay(1); |
| 463 | } |
| 464 | if (limit <= 0) |
| 465 | break; |
| 466 | page_bytes -= written; |
| 467 | ra += written; |
| 468 | } |
David S. Miller | 02fd473 | 2006-02-11 02:25:21 -0800 | [diff] [blame] | 469 | } |
David S. Miller | f3c681c | 2007-07-15 23:53:32 -0700 | [diff] [blame] | 470 | |
| 471 | if (locked) |
| 472 | spin_unlock(&port->lock); |
| 473 | local_irq_restore(flags); |
David S. Miller | 02fd473 | 2006-02-11 02:25:21 -0800 | [diff] [blame] | 474 | } |
| 475 | |
David S. Miller | c7754d4 | 2007-05-15 17:03:54 -0700 | [diff] [blame] | 476 | static inline void sunhv_console_putchar(struct uart_port *port, char c) |
| 477 | { |
| 478 | int limit = 1000000; |
| 479 | |
| 480 | while (limit-- > 0) { |
| 481 | long status = sun4v_con_putchar(c); |
| 482 | if (status == HV_EOK) |
| 483 | break; |
| 484 | udelay(1); |
| 485 | } |
| 486 | } |
| 487 | |
| 488 | static void sunhv_console_write_bychar(struct console *con, const char *s, unsigned n) |
David S. Miller | 02fd473 | 2006-02-11 02:25:21 -0800 | [diff] [blame] | 489 | { |
| 490 | struct uart_port *port = sunhv_port; |
David S. Miller | c7754d4 | 2007-05-15 17:03:54 -0700 | [diff] [blame] | 491 | unsigned long flags; |
David S. Miller | f3c681c | 2007-07-15 23:53:32 -0700 | [diff] [blame] | 492 | int i, locked = 1; |
| 493 | |
| 494 | local_irq_save(flags); |
| 495 | if (port->sysrq) { |
| 496 | locked = 0; |
| 497 | } else if (oops_in_progress) { |
| 498 | locked = spin_trylock(&port->lock); |
| 499 | } else |
| 500 | spin_lock(&port->lock); |
David S. Miller | 02fd473 | 2006-02-11 02:25:21 -0800 | [diff] [blame] | 501 | |
| 502 | for (i = 0; i < n; i++) { |
| 503 | if (*s == '\n') |
| 504 | sunhv_console_putchar(port, '\r'); |
| 505 | sunhv_console_putchar(port, *s++); |
| 506 | } |
David S. Miller | f3c681c | 2007-07-15 23:53:32 -0700 | [diff] [blame] | 507 | |
| 508 | if (locked) |
| 509 | spin_unlock(&port->lock); |
| 510 | local_irq_restore(flags); |
David S. Miller | 02fd473 | 2006-02-11 02:25:21 -0800 | [diff] [blame] | 511 | } |
| 512 | |
David S. Miller | 02fd473 | 2006-02-11 02:25:21 -0800 | [diff] [blame] | 513 | static struct console sunhv_console = { |
David S. Miller | d5a2aa2 | 2006-02-13 21:28:40 -0800 | [diff] [blame] | 514 | .name = "ttyHV", |
David S. Miller | c7754d4 | 2007-05-15 17:03:54 -0700 | [diff] [blame] | 515 | .write = sunhv_console_write_bychar, |
David S. Miller | 02fd473 | 2006-02-11 02:25:21 -0800 | [diff] [blame] | 516 | .device = uart_console_device, |
David S. Miller | 02fd473 | 2006-02-11 02:25:21 -0800 | [diff] [blame] | 517 | .flags = CON_PRINTBUFFER, |
| 518 | .index = -1, |
| 519 | .data = &sunhv_reg, |
| 520 | }; |
| 521 | |
David S. Miller | 93872ba | 2006-06-30 00:00:22 -0700 | [diff] [blame] | 522 | static int __devinit hv_probe(struct of_device *op, const struct of_device_id *match) |
David S. Miller | 02fd473 | 2006-02-11 02:25:21 -0800 | [diff] [blame] | 523 | { |
| 524 | struct uart_port *port; |
David S. Miller | c7754d4 | 2007-05-15 17:03:54 -0700 | [diff] [blame] | 525 | unsigned long minor; |
David S. Miller | 93872ba | 2006-06-30 00:00:22 -0700 | [diff] [blame] | 526 | int err; |
David S. Miller | 02fd473 | 2006-02-11 02:25:21 -0800 | [diff] [blame] | 527 | |
David S. Miller | 93872ba | 2006-06-30 00:00:22 -0700 | [diff] [blame] | 528 | if (op->irqs[0] == 0xffffffff) |
David S. Miller | 02fd473 | 2006-02-11 02:25:21 -0800 | [diff] [blame] | 529 | return -ENODEV; |
| 530 | |
David S. Miller | 93872ba | 2006-06-30 00:00:22 -0700 | [diff] [blame] | 531 | port = kzalloc(sizeof(struct uart_port), GFP_KERNEL); |
David S. Miller | 02fd473 | 2006-02-11 02:25:21 -0800 | [diff] [blame] | 532 | if (unlikely(!port)) |
| 533 | return -ENOMEM; |
| 534 | |
David S. Miller | c7754d4 | 2007-05-15 17:03:54 -0700 | [diff] [blame] | 535 | minor = 1; |
| 536 | if (sun4v_hvapi_register(HV_GRP_CORE, 1, &minor) == 0 && |
| 537 | minor >= 1) { |
| 538 | err = -ENOMEM; |
| 539 | con_write_page = kzalloc(PAGE_SIZE, GFP_KERNEL); |
| 540 | if (!con_write_page) |
| 541 | goto out_free_port; |
| 542 | |
| 543 | con_read_page = kzalloc(PAGE_SIZE, GFP_KERNEL); |
| 544 | if (!con_read_page) |
| 545 | goto out_free_con_write_page; |
| 546 | |
| 547 | sunhv_console.write = sunhv_console_write_paged; |
| 548 | sunhv_ops = &bywrite_ops; |
| 549 | } |
| 550 | |
David S. Miller | 93872ba | 2006-06-30 00:00:22 -0700 | [diff] [blame] | 551 | sunhv_port = port; |
David S. Miller | db33f9b | 2006-02-15 21:56:49 -0800 | [diff] [blame] | 552 | |
David S. Miller | 02fd473 | 2006-02-11 02:25:21 -0800 | [diff] [blame] | 553 | port->line = 0; |
| 554 | port->ops = &sunhv_pops; |
| 555 | port->type = PORT_SUNHV; |
| 556 | port->uartclk = ( 29491200 / 16 ); /* arbitrary */ |
| 557 | |
David S. Miller | db33f9b | 2006-02-15 21:56:49 -0800 | [diff] [blame] | 558 | port->membase = (unsigned char __iomem *) __pa(port); |
| 559 | |
David S. Miller | 93872ba | 2006-06-30 00:00:22 -0700 | [diff] [blame] | 560 | port->irq = op->irqs[0]; |
| 561 | |
| 562 | port->dev = &op->dev; |
David S. Miller | 02fd473 | 2006-02-11 02:25:21 -0800 | [diff] [blame] | 563 | |
Martin Habets | 58d784a | 2007-12-11 03:37:04 -0800 | [diff] [blame] | 564 | err = sunserial_register_minors(&sunhv_reg, 1); |
David S. Miller | 93872ba | 2006-06-30 00:00:22 -0700 | [diff] [blame] | 565 | if (err) |
David S. Miller | c7754d4 | 2007-05-15 17:03:54 -0700 | [diff] [blame] | 566 | goto out_free_con_read_page; |
David S. Miller | 02fd473 | 2006-02-11 02:25:21 -0800 | [diff] [blame] | 567 | |
David S. Miller | c73fcc8 | 2007-07-20 16:59:26 -0700 | [diff] [blame] | 568 | sunserial_console_match(&sunhv_console, op->node, |
| 569 | &sunhv_reg, port->line); |
David S. Miller | d5a2aa2 | 2006-02-13 21:28:40 -0800 | [diff] [blame] | 570 | |
David S. Miller | 93872ba | 2006-06-30 00:00:22 -0700 | [diff] [blame] | 571 | err = uart_add_one_port(&sunhv_reg, port); |
| 572 | if (err) |
| 573 | goto out_unregister_driver; |
David S. Miller | 02fd473 | 2006-02-11 02:25:21 -0800 | [diff] [blame] | 574 | |
David S. Miller | 93872ba | 2006-06-30 00:00:22 -0700 | [diff] [blame] | 575 | err = request_irq(port->irq, sunhv_interrupt, 0, "hvcons", port); |
| 576 | if (err) |
| 577 | goto out_remove_port; |
David S. Miller | db33f9b | 2006-02-15 21:56:49 -0800 | [diff] [blame] | 578 | |
David S. Miller | 93872ba | 2006-06-30 00:00:22 -0700 | [diff] [blame] | 579 | dev_set_drvdata(&op->dev, port); |
David S. Miller | 02fd473 | 2006-02-11 02:25:21 -0800 | [diff] [blame] | 580 | |
| 581 | return 0; |
David S. Miller | 93872ba | 2006-06-30 00:00:22 -0700 | [diff] [blame] | 582 | |
| 583 | out_remove_port: |
| 584 | uart_remove_one_port(&sunhv_reg, port); |
| 585 | |
| 586 | out_unregister_driver: |
Martin Habets | 58d784a | 2007-12-11 03:37:04 -0800 | [diff] [blame] | 587 | sunserial_unregister_minors(&sunhv_reg, 1); |
David S. Miller | 93872ba | 2006-06-30 00:00:22 -0700 | [diff] [blame] | 588 | |
David S. Miller | c7754d4 | 2007-05-15 17:03:54 -0700 | [diff] [blame] | 589 | out_free_con_read_page: |
| 590 | kfree(con_read_page); |
| 591 | |
| 592 | out_free_con_write_page: |
| 593 | kfree(con_write_page); |
| 594 | |
David S. Miller | 93872ba | 2006-06-30 00:00:22 -0700 | [diff] [blame] | 595 | out_free_port: |
| 596 | kfree(port); |
| 597 | sunhv_port = NULL; |
| 598 | return err; |
David S. Miller | 02fd473 | 2006-02-11 02:25:21 -0800 | [diff] [blame] | 599 | } |
| 600 | |
David S. Miller | 93872ba | 2006-06-30 00:00:22 -0700 | [diff] [blame] | 601 | static int __devexit hv_remove(struct of_device *dev) |
David S. Miller | 02fd473 | 2006-02-11 02:25:21 -0800 | [diff] [blame] | 602 | { |
David S. Miller | 93872ba | 2006-06-30 00:00:22 -0700 | [diff] [blame] | 603 | struct uart_port *port = dev_get_drvdata(&dev->dev); |
David S. Miller | 02fd473 | 2006-02-11 02:25:21 -0800 | [diff] [blame] | 604 | |
David S. Miller | db33f9b | 2006-02-15 21:56:49 -0800 | [diff] [blame] | 605 | free_irq(port->irq, port); |
| 606 | |
David S. Miller | 02fd473 | 2006-02-11 02:25:21 -0800 | [diff] [blame] | 607 | uart_remove_one_port(&sunhv_reg, port); |
David S. Miller | 02fd473 | 2006-02-11 02:25:21 -0800 | [diff] [blame] | 608 | |
Martin Habets | 58d784a | 2007-12-11 03:37:04 -0800 | [diff] [blame] | 609 | sunserial_unregister_minors(&sunhv_reg, 1); |
David S. Miller | 02fd473 | 2006-02-11 02:25:21 -0800 | [diff] [blame] | 610 | |
David S. Miller | 93872ba | 2006-06-30 00:00:22 -0700 | [diff] [blame] | 611 | kfree(port); |
David S. Miller | 02fd473 | 2006-02-11 02:25:21 -0800 | [diff] [blame] | 612 | sunhv_port = NULL; |
David S. Miller | 93872ba | 2006-06-30 00:00:22 -0700 | [diff] [blame] | 613 | |
| 614 | dev_set_drvdata(&dev->dev, NULL); |
| 615 | |
| 616 | return 0; |
| 617 | } |
| 618 | |
| 619 | static struct of_device_id hv_match[] = { |
| 620 | { |
| 621 | .name = "console", |
| 622 | .compatible = "qcn", |
| 623 | }, |
David S. Miller | 7a05b59 | 2007-05-13 21:27:37 -0700 | [diff] [blame] | 624 | { |
| 625 | .name = "console", |
| 626 | .compatible = "SUNW,sun4v-console", |
| 627 | }, |
David S. Miller | 93872ba | 2006-06-30 00:00:22 -0700 | [diff] [blame] | 628 | {}, |
| 629 | }; |
| 630 | MODULE_DEVICE_TABLE(of, hv_match); |
| 631 | |
| 632 | static struct of_platform_driver hv_driver = { |
| 633 | .name = "hv", |
| 634 | .match_table = hv_match, |
| 635 | .probe = hv_probe, |
| 636 | .remove = __devexit_p(hv_remove), |
| 637 | }; |
| 638 | |
| 639 | static int __init sunhv_init(void) |
| 640 | { |
| 641 | if (tlb_type != hypervisor) |
| 642 | return -ENODEV; |
| 643 | |
| 644 | return of_register_driver(&hv_driver, &of_bus_type); |
| 645 | } |
| 646 | |
| 647 | static void __exit sunhv_exit(void) |
| 648 | { |
| 649 | of_unregister_driver(&hv_driver); |
David S. Miller | 02fd473 | 2006-02-11 02:25:21 -0800 | [diff] [blame] | 650 | } |
| 651 | |
| 652 | module_init(sunhv_init); |
| 653 | module_exit(sunhv_exit); |
| 654 | |
| 655 | MODULE_AUTHOR("David S. Miller"); |
David S. Miller | 93872ba | 2006-06-30 00:00:22 -0700 | [diff] [blame] | 656 | MODULE_DESCRIPTION("SUN4V Hypervisor console driver"); |
| 657 | MODULE_VERSION("2.0"); |
David S. Miller | 02fd473 | 2006-02-11 02:25:21 -0800 | [diff] [blame] | 658 | MODULE_LICENSE("GPL"); |