Greg Kroah-Hartman | e3b3d0f | 2017-11-06 18:11:51 +0100 | [diff] [blame] | 1 | // SPDX-License-Identifier: GPL-2.0+ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2 | /* |
| 3 | * Copyright (C) 2004 Hollis Blanchard <hollisb@us.ibm.com>, IBM |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4 | */ |
| 5 | |
| 6 | /* Host Virtual Serial Interface (HVSI) is a protocol between the hosted OS |
| 7 | * and the service processor on IBM pSeries servers. On these servers, there |
| 8 | * are no serial ports under the OS's control, and sometimes there is no other |
| 9 | * console available either. However, the service processor has two standard |
| 10 | * serial ports, so this over-complicated protocol allows the OS to control |
| 11 | * those ports by proxy. |
| 12 | * |
| 13 | * Besides data, the procotol supports the reading/writing of the serial |
| 14 | * port's DTR line, and the reading of the CD line. This is to allow the OS to |
| 15 | * control a modem attached to the service processor's serial port. Note that |
| 16 | * the OS cannot change the speed of the port through this protocol. |
| 17 | */ |
| 18 | |
| 19 | #undef DEBUG |
| 20 | |
| 21 | #include <linux/console.h> |
| 22 | #include <linux/ctype.h> |
| 23 | #include <linux/delay.h> |
| 24 | #include <linux/init.h> |
| 25 | #include <linux/interrupt.h> |
| 26 | #include <linux/module.h> |
| 27 | #include <linux/major.h> |
| 28 | #include <linux/kernel.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 29 | #include <linux/spinlock.h> |
| 30 | #include <linux/sysrq.h> |
| 31 | #include <linux/tty.h> |
| 32 | #include <linux/tty_flip.h> |
| 33 | #include <asm/hvcall.h> |
| 34 | #include <asm/hvconsole.h> |
| 35 | #include <asm/prom.h> |
Linus Torvalds | 7c0f6ba | 2016-12-24 11:46:01 -0800 | [diff] [blame] | 36 | #include <linux/uaccess.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 37 | #include <asm/vio.h> |
| 38 | #include <asm/param.h> |
Benjamin Herrenschmidt | 725e789 | 2011-06-16 15:08:12 +0000 | [diff] [blame] | 39 | #include <asm/hvsi.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 40 | |
| 41 | #define HVSI_MAJOR 229 |
| 42 | #define HVSI_MINOR 128 |
| 43 | #define MAX_NR_HVSI_CONSOLES 4 |
| 44 | |
| 45 | #define HVSI_TIMEOUT (5*HZ) |
| 46 | #define HVSI_VERSION 1 |
| 47 | #define HVSI_MAX_PACKET 256 |
| 48 | #define HVSI_MAX_READ 16 |
| 49 | #define HVSI_MAX_OUTGOING_DATA 12 |
| 50 | #define N_OUTBUF 12 |
| 51 | |
| 52 | /* |
| 53 | * we pass data via two 8-byte registers, so we would like our char arrays |
| 54 | * properly aligned for those loads. |
| 55 | */ |
| 56 | #define __ALIGNED__ __attribute__((__aligned__(sizeof(long)))) |
| 57 | |
| 58 | struct hvsi_struct { |
Jiri Slaby | d73a4e7 | 2012-04-02 13:54:28 +0200 | [diff] [blame] | 59 | struct tty_port port; |
David Howells | c402895 | 2006-11-22 14:57:56 +0000 | [diff] [blame] | 60 | struct delayed_work writer; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 61 | struct work_struct handshaker; |
| 62 | wait_queue_head_t emptyq; /* woken when outbuf is emptied */ |
| 63 | wait_queue_head_t stateq; /* woken when HVSI state changes */ |
| 64 | spinlock_t lock; |
| 65 | int index; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 66 | uint8_t throttle_buf[128]; |
| 67 | uint8_t outbuf[N_OUTBUF]; /* to implement write_room and chars_in_buffer */ |
| 68 | /* inbuf is for packet reassembly. leave a little room for leftovers. */ |
| 69 | uint8_t inbuf[HVSI_MAX_PACKET + HVSI_MAX_READ]; |
| 70 | uint8_t *inbuf_end; |
| 71 | int n_throttle; |
| 72 | int n_outbuf; |
| 73 | uint32_t vtermno; |
| 74 | uint32_t virq; |
| 75 | atomic_t seqno; /* HVSI packet sequence number */ |
| 76 | uint16_t mctrl; |
| 77 | uint8_t state; /* HVSI protocol state */ |
| 78 | uint8_t flags; |
| 79 | #ifdef CONFIG_MAGIC_SYSRQ |
| 80 | uint8_t sysrq; |
| 81 | #endif /* CONFIG_MAGIC_SYSRQ */ |
| 82 | }; |
| 83 | static struct hvsi_struct hvsi_ports[MAX_NR_HVSI_CONSOLES]; |
| 84 | |
| 85 | static struct tty_driver *hvsi_driver; |
| 86 | static int hvsi_count; |
| 87 | static int (*hvsi_wait)(struct hvsi_struct *hp, int state); |
| 88 | |
| 89 | enum HVSI_PROTOCOL_STATE { |
| 90 | HVSI_CLOSED, |
| 91 | HVSI_WAIT_FOR_VER_RESPONSE, |
| 92 | HVSI_WAIT_FOR_VER_QUERY, |
| 93 | HVSI_OPEN, |
| 94 | HVSI_WAIT_FOR_MCTRL_RESPONSE, |
| 95 | HVSI_FSP_DIED, |
| 96 | }; |
| 97 | #define HVSI_CONSOLE 0x1 |
| 98 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 99 | static inline int is_console(struct hvsi_struct *hp) |
| 100 | { |
| 101 | return hp->flags & HVSI_CONSOLE; |
| 102 | } |
| 103 | |
| 104 | static inline int is_open(struct hvsi_struct *hp) |
| 105 | { |
| 106 | /* if we're waiting for an mctrl then we're already open */ |
| 107 | return (hp->state == HVSI_OPEN) |
| 108 | || (hp->state == HVSI_WAIT_FOR_MCTRL_RESPONSE); |
| 109 | } |
| 110 | |
| 111 | static inline void print_state(struct hvsi_struct *hp) |
| 112 | { |
| 113 | #ifdef DEBUG |
| 114 | static const char *state_names[] = { |
| 115 | "HVSI_CLOSED", |
| 116 | "HVSI_WAIT_FOR_VER_RESPONSE", |
| 117 | "HVSI_WAIT_FOR_VER_QUERY", |
| 118 | "HVSI_OPEN", |
| 119 | "HVSI_WAIT_FOR_MCTRL_RESPONSE", |
| 120 | "HVSI_FSP_DIED", |
| 121 | }; |
Phil Carmody | 08a82c6 | 2010-05-24 14:33:04 -0700 | [diff] [blame] | 122 | const char *name = (hp->state < ARRAY_SIZE(state_names)) |
| 123 | ? state_names[hp->state] : "UNKNOWN"; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 124 | |
| 125 | pr_debug("hvsi%i: state = %s\n", hp->index, name); |
| 126 | #endif /* DEBUG */ |
| 127 | } |
| 128 | |
| 129 | static inline void __set_state(struct hvsi_struct *hp, int state) |
| 130 | { |
| 131 | hp->state = state; |
| 132 | print_state(hp); |
| 133 | wake_up_all(&hp->stateq); |
| 134 | } |
| 135 | |
| 136 | static inline void set_state(struct hvsi_struct *hp, int state) |
| 137 | { |
| 138 | unsigned long flags; |
| 139 | |
| 140 | spin_lock_irqsave(&hp->lock, flags); |
| 141 | __set_state(hp, state); |
| 142 | spin_unlock_irqrestore(&hp->lock, flags); |
| 143 | } |
| 144 | |
| 145 | static inline int len_packet(const uint8_t *packet) |
| 146 | { |
| 147 | return (int)((struct hvsi_header *)packet)->len; |
| 148 | } |
| 149 | |
| 150 | static inline int is_header(const uint8_t *packet) |
| 151 | { |
| 152 | struct hvsi_header *header = (struct hvsi_header *)packet; |
| 153 | return header->type >= VS_QUERY_RESPONSE_PACKET_HEADER; |
| 154 | } |
| 155 | |
| 156 | static inline int got_packet(const struct hvsi_struct *hp, uint8_t *packet) |
| 157 | { |
| 158 | if (hp->inbuf_end < packet + sizeof(struct hvsi_header)) |
| 159 | return 0; /* don't even have the packet header */ |
| 160 | |
| 161 | if (hp->inbuf_end < (packet + len_packet(packet))) |
| 162 | return 0; /* don't have the rest of the packet */ |
| 163 | |
| 164 | return 1; |
| 165 | } |
| 166 | |
| 167 | /* shift remaining bytes in packetbuf down */ |
| 168 | static void compact_inbuf(struct hvsi_struct *hp, uint8_t *read_to) |
| 169 | { |
| 170 | int remaining = (int)(hp->inbuf_end - read_to); |
| 171 | |
Harvey Harrison | bf9d892 | 2008-04-30 00:55:10 -0700 | [diff] [blame] | 172 | pr_debug("%s: %i chars remain\n", __func__, remaining); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 173 | |
| 174 | if (read_to != hp->inbuf) |
| 175 | memmove(hp->inbuf, read_to, remaining); |
| 176 | |
| 177 | hp->inbuf_end = hp->inbuf + remaining; |
| 178 | } |
| 179 | |
| 180 | #ifdef DEBUG |
| 181 | #define dbg_dump_packet(packet) dump_packet(packet) |
| 182 | #define dbg_dump_hex(data, len) dump_hex(data, len) |
| 183 | #else |
| 184 | #define dbg_dump_packet(packet) do { } while (0) |
| 185 | #define dbg_dump_hex(data, len) do { } while (0) |
| 186 | #endif |
| 187 | |
| 188 | static void dump_hex(const uint8_t *data, int len) |
| 189 | { |
| 190 | int i; |
| 191 | |
| 192 | printk(" "); |
| 193 | for (i=0; i < len; i++) |
| 194 | printk("%.2x", data[i]); |
| 195 | |
| 196 | printk("\n "); |
| 197 | for (i=0; i < len; i++) { |
| 198 | if (isprint(data[i])) |
| 199 | printk("%c", data[i]); |
| 200 | else |
| 201 | printk("."); |
| 202 | } |
| 203 | printk("\n"); |
| 204 | } |
| 205 | |
| 206 | static void dump_packet(uint8_t *packet) |
| 207 | { |
| 208 | struct hvsi_header *header = (struct hvsi_header *)packet; |
| 209 | |
| 210 | printk("type 0x%x, len %i, seqno %i:\n", header->type, header->len, |
| 211 | header->seqno); |
| 212 | |
| 213 | dump_hex(packet, header->len); |
| 214 | } |
| 215 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 216 | static int hvsi_read(struct hvsi_struct *hp, char *buf, int count) |
| 217 | { |
| 218 | unsigned long got; |
| 219 | |
Milton Miller | 88de0be | 2005-07-07 17:56:27 -0700 | [diff] [blame] | 220 | got = hvc_get_chars(hp->vtermno, buf, count); |
| 221 | |
| 222 | return got; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 223 | } |
| 224 | |
| 225 | static void hvsi_recv_control(struct hvsi_struct *hp, uint8_t *packet, |
Jiri Slaby | 28c0447 | 2012-04-02 13:54:29 +0200 | [diff] [blame] | 226 | struct tty_struct *tty, struct hvsi_struct **to_handshake) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 227 | { |
| 228 | struct hvsi_control *header = (struct hvsi_control *)packet; |
| 229 | |
Laurent Dufour | 4807980 | 2015-07-31 11:29:50 +0200 | [diff] [blame] | 230 | switch (be16_to_cpu(header->verb)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 231 | case VSV_MODEM_CTL_UPDATE: |
Laurent Dufour | 4807980 | 2015-07-31 11:29:50 +0200 | [diff] [blame] | 232 | if ((be32_to_cpu(header->word) & HVSI_TSCD) == 0) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 233 | /* CD went away; no more connection */ |
| 234 | pr_debug("hvsi%i: CD dropped\n", hp->index); |
| 235 | hp->mctrl &= TIOCM_CD; |
Jiri Slaby | 28c0447 | 2012-04-02 13:54:29 +0200 | [diff] [blame] | 236 | if (tty && !C_CLOCAL(tty)) |
| 237 | tty_hangup(tty); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 238 | } |
| 239 | break; |
| 240 | case VSV_CLOSE_PROTOCOL: |
| 241 | pr_debug("hvsi%i: service processor came back\n", hp->index); |
| 242 | if (hp->state != HVSI_CLOSED) { |
| 243 | *to_handshake = hp; |
| 244 | } |
| 245 | break; |
| 246 | default: |
| 247 | printk(KERN_WARNING "hvsi%i: unknown HVSI control packet: ", |
| 248 | hp->index); |
| 249 | dump_packet(packet); |
| 250 | break; |
| 251 | } |
| 252 | } |
| 253 | |
| 254 | static void hvsi_recv_response(struct hvsi_struct *hp, uint8_t *packet) |
| 255 | { |
| 256 | struct hvsi_query_response *resp = (struct hvsi_query_response *)packet; |
Laurent Dufour | 4807980 | 2015-07-31 11:29:50 +0200 | [diff] [blame] | 257 | uint32_t mctrl_word; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 258 | |
| 259 | switch (hp->state) { |
| 260 | case HVSI_WAIT_FOR_VER_RESPONSE: |
| 261 | __set_state(hp, HVSI_WAIT_FOR_VER_QUERY); |
| 262 | break; |
| 263 | case HVSI_WAIT_FOR_MCTRL_RESPONSE: |
| 264 | hp->mctrl = 0; |
Laurent Dufour | 4807980 | 2015-07-31 11:29:50 +0200 | [diff] [blame] | 265 | mctrl_word = be32_to_cpu(resp->u.mctrl_word); |
| 266 | if (mctrl_word & HVSI_TSDTR) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 267 | hp->mctrl |= TIOCM_DTR; |
Laurent Dufour | 4807980 | 2015-07-31 11:29:50 +0200 | [diff] [blame] | 268 | if (mctrl_word & HVSI_TSCD) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 269 | hp->mctrl |= TIOCM_CD; |
| 270 | __set_state(hp, HVSI_OPEN); |
| 271 | break; |
| 272 | default: |
| 273 | printk(KERN_ERR "hvsi%i: unexpected query response: ", hp->index); |
| 274 | dump_packet(packet); |
| 275 | break; |
| 276 | } |
| 277 | } |
| 278 | |
| 279 | /* respond to service processor's version query */ |
| 280 | static int hvsi_version_respond(struct hvsi_struct *hp, uint16_t query_seqno) |
| 281 | { |
| 282 | struct hvsi_query_response packet __ALIGNED__; |
| 283 | int wrote; |
| 284 | |
Benjamin Herrenschmidt | 048bee7 | 2011-06-16 15:08:24 +0000 | [diff] [blame] | 285 | packet.hdr.type = VS_QUERY_RESPONSE_PACKET_HEADER; |
| 286 | packet.hdr.len = sizeof(struct hvsi_query_response); |
Laurent Dufour | 4807980 | 2015-07-31 11:29:50 +0200 | [diff] [blame] | 287 | packet.hdr.seqno = cpu_to_be16(atomic_inc_return(&hp->seqno)); |
| 288 | packet.verb = cpu_to_be16(VSV_SEND_VERSION_NUMBER); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 289 | packet.u.version = HVSI_VERSION; |
Laurent Dufour | 4807980 | 2015-07-31 11:29:50 +0200 | [diff] [blame] | 290 | packet.query_seqno = cpu_to_be16(query_seqno+1); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 291 | |
Benjamin Herrenschmidt | 048bee7 | 2011-06-16 15:08:24 +0000 | [diff] [blame] | 292 | pr_debug("%s: sending %i bytes\n", __func__, packet.hdr.len); |
| 293 | dbg_dump_hex((uint8_t*)&packet, packet.hdr.len); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 294 | |
Benjamin Herrenschmidt | 048bee7 | 2011-06-16 15:08:24 +0000 | [diff] [blame] | 295 | wrote = hvc_put_chars(hp->vtermno, (char *)&packet, packet.hdr.len); |
| 296 | if (wrote != packet.hdr.len) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 297 | printk(KERN_ERR "hvsi%i: couldn't send query response!\n", |
| 298 | hp->index); |
| 299 | return -EIO; |
| 300 | } |
| 301 | |
| 302 | return 0; |
| 303 | } |
| 304 | |
| 305 | static void hvsi_recv_query(struct hvsi_struct *hp, uint8_t *packet) |
| 306 | { |
| 307 | struct hvsi_query *query = (struct hvsi_query *)packet; |
| 308 | |
| 309 | switch (hp->state) { |
| 310 | case HVSI_WAIT_FOR_VER_QUERY: |
Laurent Dufour | 4807980 | 2015-07-31 11:29:50 +0200 | [diff] [blame] | 311 | hvsi_version_respond(hp, be16_to_cpu(query->hdr.seqno)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 312 | __set_state(hp, HVSI_OPEN); |
| 313 | break; |
| 314 | default: |
| 315 | printk(KERN_ERR "hvsi%i: unexpected query: ", hp->index); |
| 316 | dump_packet(packet); |
| 317 | break; |
| 318 | } |
| 319 | } |
| 320 | |
Jiri Slaby | 92a19f9 | 2013-01-03 15:53:03 +0100 | [diff] [blame] | 321 | static void hvsi_insert_chars(struct hvsi_struct *hp, const char *buf, int len) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 322 | { |
| 323 | int i; |
| 324 | |
| 325 | for (i=0; i < len; i++) { |
| 326 | char c = buf[i]; |
| 327 | #ifdef CONFIG_MAGIC_SYSRQ |
| 328 | if (c == '\0') { |
| 329 | hp->sysrq = 1; |
| 330 | continue; |
| 331 | } else if (hp->sysrq) { |
Dmitry Torokhov | f335397 | 2010-08-17 21:15:47 -0700 | [diff] [blame] | 332 | handle_sysrq(c); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 333 | hp->sysrq = 0; |
| 334 | continue; |
| 335 | } |
| 336 | #endif /* CONFIG_MAGIC_SYSRQ */ |
Jiri Slaby | 92a19f9 | 2013-01-03 15:53:03 +0100 | [diff] [blame] | 337 | tty_insert_flip_char(&hp->port, c, 0); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 338 | } |
| 339 | } |
| 340 | |
| 341 | /* |
| 342 | * We could get 252 bytes of data at once here. But the tty layer only |
| 343 | * throttles us at TTY_THRESHOLD_THROTTLE (128) bytes, so we could overflow |
| 344 | * it. Accordingly we won't send more than 128 bytes at a time to the flip |
| 345 | * buffer, which will give the tty buffer a chance to throttle us. Should the |
| 346 | * value of TTY_THRESHOLD_THROTTLE change in n_tty.c, this code should be |
| 347 | * revisited. |
| 348 | */ |
| 349 | #define TTY_THRESHOLD_THROTTLE 128 |
Jiri Slaby | 92a19f9 | 2013-01-03 15:53:03 +0100 | [diff] [blame] | 350 | static bool hvsi_recv_data(struct hvsi_struct *hp, const uint8_t *packet) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 351 | { |
| 352 | const struct hvsi_header *header = (const struct hvsi_header *)packet; |
| 353 | const uint8_t *data = packet + sizeof(struct hvsi_header); |
| 354 | int datalen = header->len - sizeof(struct hvsi_header); |
| 355 | int overflow = datalen - TTY_THRESHOLD_THROTTLE; |
| 356 | |
| 357 | pr_debug("queueing %i chars '%.*s'\n", datalen, datalen, data); |
| 358 | |
| 359 | if (datalen == 0) |
Jiri Slaby | 28c0447 | 2012-04-02 13:54:29 +0200 | [diff] [blame] | 360 | return false; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 361 | |
| 362 | if (overflow > 0) { |
Harvey Harrison | bf9d892 | 2008-04-30 00:55:10 -0700 | [diff] [blame] | 363 | pr_debug("%s: got >TTY_THRESHOLD_THROTTLE bytes\n", __func__); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 364 | datalen = TTY_THRESHOLD_THROTTLE; |
| 365 | } |
| 366 | |
Jiri Slaby | 92a19f9 | 2013-01-03 15:53:03 +0100 | [diff] [blame] | 367 | hvsi_insert_chars(hp, data, datalen); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 368 | |
| 369 | if (overflow > 0) { |
| 370 | /* |
| 371 | * we still have more data to deliver, so we need to save off the |
| 372 | * overflow and send it later |
| 373 | */ |
Harvey Harrison | bf9d892 | 2008-04-30 00:55:10 -0700 | [diff] [blame] | 374 | pr_debug("%s: deferring overflow\n", __func__); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 375 | memcpy(hp->throttle_buf, data + TTY_THRESHOLD_THROTTLE, overflow); |
| 376 | hp->n_throttle = overflow; |
| 377 | } |
| 378 | |
Jiri Slaby | 28c0447 | 2012-04-02 13:54:29 +0200 | [diff] [blame] | 379 | return true; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 380 | } |
| 381 | |
| 382 | /* |
| 383 | * Returns true/false indicating data successfully read from hypervisor. |
| 384 | * Used both to get packets for tty connections and to advance the state |
| 385 | * machine during console handshaking (in which case tty = NULL and we ignore |
| 386 | * incoming data). |
| 387 | */ |
Jiri Slaby | 28c0447 | 2012-04-02 13:54:29 +0200 | [diff] [blame] | 388 | static int hvsi_load_chunk(struct hvsi_struct *hp, struct tty_struct *tty, |
| 389 | struct hvsi_struct **handshake) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 390 | { |
| 391 | uint8_t *packet = hp->inbuf; |
| 392 | int chunklen; |
Jiri Slaby | 28c0447 | 2012-04-02 13:54:29 +0200 | [diff] [blame] | 393 | bool flip = false; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 394 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 395 | *handshake = NULL; |
| 396 | |
| 397 | chunklen = hvsi_read(hp, hp->inbuf_end, HVSI_MAX_READ); |
| 398 | if (chunklen == 0) { |
Harvey Harrison | bf9d892 | 2008-04-30 00:55:10 -0700 | [diff] [blame] | 399 | pr_debug("%s: 0-length read\n", __func__); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 400 | return 0; |
| 401 | } |
| 402 | |
Harvey Harrison | bf9d892 | 2008-04-30 00:55:10 -0700 | [diff] [blame] | 403 | pr_debug("%s: got %i bytes\n", __func__, chunklen); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 404 | dbg_dump_hex(hp->inbuf_end, chunklen); |
| 405 | |
| 406 | hp->inbuf_end += chunklen; |
| 407 | |
| 408 | /* handle all completed packets */ |
| 409 | while ((packet < hp->inbuf_end) && got_packet(hp, packet)) { |
| 410 | struct hvsi_header *header = (struct hvsi_header *)packet; |
| 411 | |
| 412 | if (!is_header(packet)) { |
| 413 | printk(KERN_ERR "hvsi%i: got malformed packet\n", hp->index); |
| 414 | /* skip bytes until we find a header or run out of data */ |
| 415 | while ((packet < hp->inbuf_end) && (!is_header(packet))) |
| 416 | packet++; |
| 417 | continue; |
| 418 | } |
| 419 | |
Harvey Harrison | bf9d892 | 2008-04-30 00:55:10 -0700 | [diff] [blame] | 420 | pr_debug("%s: handling %i-byte packet\n", __func__, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 421 | len_packet(packet)); |
| 422 | dbg_dump_packet(packet); |
| 423 | |
| 424 | switch (header->type) { |
| 425 | case VS_DATA_PACKET_HEADER: |
| 426 | if (!is_open(hp)) |
| 427 | break; |
Jiri Slaby | 92a19f9 | 2013-01-03 15:53:03 +0100 | [diff] [blame] | 428 | flip = hvsi_recv_data(hp, packet); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 429 | break; |
| 430 | case VS_CONTROL_PACKET_HEADER: |
Jiri Slaby | 28c0447 | 2012-04-02 13:54:29 +0200 | [diff] [blame] | 431 | hvsi_recv_control(hp, packet, tty, handshake); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 432 | break; |
| 433 | case VS_QUERY_RESPONSE_PACKET_HEADER: |
| 434 | hvsi_recv_response(hp, packet); |
| 435 | break; |
| 436 | case VS_QUERY_PACKET_HEADER: |
| 437 | hvsi_recv_query(hp, packet); |
| 438 | break; |
| 439 | default: |
| 440 | printk(KERN_ERR "hvsi%i: unknown HVSI packet type 0x%x\n", |
| 441 | hp->index, header->type); |
| 442 | dump_packet(packet); |
| 443 | break; |
| 444 | } |
| 445 | |
| 446 | packet += len_packet(packet); |
| 447 | |
Jiri Slaby | 28c0447 | 2012-04-02 13:54:29 +0200 | [diff] [blame] | 448 | if (*handshake) { |
| 449 | pr_debug("%s: handshake\n", __func__); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 450 | break; |
| 451 | } |
| 452 | } |
| 453 | |
| 454 | compact_inbuf(hp, packet); |
| 455 | |
Jiri Slaby | 28c0447 | 2012-04-02 13:54:29 +0200 | [diff] [blame] | 456 | if (flip) |
Jiri Slaby | 2e124b4 | 2013-01-03 15:53:06 +0100 | [diff] [blame] | 457 | tty_flip_buffer_push(&hp->port); |
Jiri Slaby | 28c0447 | 2012-04-02 13:54:29 +0200 | [diff] [blame] | 458 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 459 | return 1; |
| 460 | } |
| 461 | |
Jiri Slaby | 92a19f9 | 2013-01-03 15:53:03 +0100 | [diff] [blame] | 462 | static void hvsi_send_overflow(struct hvsi_struct *hp) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 463 | { |
Harvey Harrison | bf9d892 | 2008-04-30 00:55:10 -0700 | [diff] [blame] | 464 | pr_debug("%s: delivering %i bytes overflow\n", __func__, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 465 | hp->n_throttle); |
| 466 | |
Jiri Slaby | 92a19f9 | 2013-01-03 15:53:03 +0100 | [diff] [blame] | 467 | hvsi_insert_chars(hp, hp->throttle_buf, hp->n_throttle); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 468 | hp->n_throttle = 0; |
| 469 | } |
| 470 | |
| 471 | /* |
| 472 | * must get all pending data because we only get an irq on empty->non-empty |
| 473 | * transition |
| 474 | */ |
David Howells | 7d12e78 | 2006-10-05 14:55:46 +0100 | [diff] [blame] | 475 | static irqreturn_t hvsi_interrupt(int irq, void *arg) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 476 | { |
| 477 | struct hvsi_struct *hp = (struct hvsi_struct *)arg; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 478 | struct hvsi_struct *handshake; |
Jiri Slaby | daea440 | 2012-04-02 13:54:30 +0200 | [diff] [blame] | 479 | struct tty_struct *tty; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 480 | unsigned long flags; |
| 481 | int again = 1; |
| 482 | |
Harvey Harrison | bf9d892 | 2008-04-30 00:55:10 -0700 | [diff] [blame] | 483 | pr_debug("%s\n", __func__); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 484 | |
Jiri Slaby | daea440 | 2012-04-02 13:54:30 +0200 | [diff] [blame] | 485 | tty = tty_port_tty_get(&hp->port); |
| 486 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 487 | while (again) { |
| 488 | spin_lock_irqsave(&hp->lock, flags); |
Jiri Slaby | daea440 | 2012-04-02 13:54:30 +0200 | [diff] [blame] | 489 | again = hvsi_load_chunk(hp, tty, &handshake); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 490 | spin_unlock_irqrestore(&hp->lock, flags); |
| 491 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 492 | if (handshake) { |
| 493 | pr_debug("hvsi%i: attempting re-handshake\n", handshake->index); |
| 494 | schedule_work(&handshake->handshaker); |
| 495 | } |
| 496 | } |
| 497 | |
| 498 | spin_lock_irqsave(&hp->lock, flags); |
Peter Hurley | 97ef38b | 2016-04-09 17:11:36 -0700 | [diff] [blame] | 499 | if (tty && hp->n_throttle && !tty_throttled(tty)) { |
Jiri Slaby | daea440 | 2012-04-02 13:54:30 +0200 | [diff] [blame] | 500 | /* we weren't hung up and we weren't throttled, so we can |
| 501 | * deliver the rest now */ |
Jiri Slaby | 92a19f9 | 2013-01-03 15:53:03 +0100 | [diff] [blame] | 502 | hvsi_send_overflow(hp); |
Jiri Slaby | 2e124b4 | 2013-01-03 15:53:06 +0100 | [diff] [blame] | 503 | tty_flip_buffer_push(&hp->port); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 504 | } |
| 505 | spin_unlock_irqrestore(&hp->lock, flags); |
| 506 | |
Jiri Slaby | daea440 | 2012-04-02 13:54:30 +0200 | [diff] [blame] | 507 | tty_kref_put(tty); |
| 508 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 509 | return IRQ_HANDLED; |
| 510 | } |
| 511 | |
| 512 | /* for boot console, before the irq handler is running */ |
| 513 | static int __init poll_for_state(struct hvsi_struct *hp, int state) |
| 514 | { |
| 515 | unsigned long end_jiffies = jiffies + HVSI_TIMEOUT; |
| 516 | |
| 517 | for (;;) { |
David Howells | 7d12e78 | 2006-10-05 14:55:46 +0100 | [diff] [blame] | 518 | hvsi_interrupt(hp->virq, (void *)hp); /* get pending data */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 519 | |
| 520 | if (hp->state == state) |
| 521 | return 0; |
| 522 | |
| 523 | mdelay(5); |
| 524 | if (time_after(jiffies, end_jiffies)) |
| 525 | return -EIO; |
| 526 | } |
| 527 | } |
| 528 | |
| 529 | /* wait for irq handler to change our state */ |
| 530 | static int wait_for_state(struct hvsi_struct *hp, int state) |
| 531 | { |
| 532 | int ret = 0; |
| 533 | |
| 534 | if (!wait_event_timeout(hp->stateq, (hp->state == state), HVSI_TIMEOUT)) |
| 535 | ret = -EIO; |
| 536 | |
| 537 | return ret; |
| 538 | } |
| 539 | |
| 540 | static int hvsi_query(struct hvsi_struct *hp, uint16_t verb) |
| 541 | { |
| 542 | struct hvsi_query packet __ALIGNED__; |
| 543 | int wrote; |
| 544 | |
Benjamin Herrenschmidt | 048bee7 | 2011-06-16 15:08:24 +0000 | [diff] [blame] | 545 | packet.hdr.type = VS_QUERY_PACKET_HEADER; |
| 546 | packet.hdr.len = sizeof(struct hvsi_query); |
Laurent Dufour | 4807980 | 2015-07-31 11:29:50 +0200 | [diff] [blame] | 547 | packet.hdr.seqno = cpu_to_be16(atomic_inc_return(&hp->seqno)); |
| 548 | packet.verb = cpu_to_be16(verb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 549 | |
Benjamin Herrenschmidt | 048bee7 | 2011-06-16 15:08:24 +0000 | [diff] [blame] | 550 | pr_debug("%s: sending %i bytes\n", __func__, packet.hdr.len); |
| 551 | dbg_dump_hex((uint8_t*)&packet, packet.hdr.len); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 552 | |
Benjamin Herrenschmidt | 048bee7 | 2011-06-16 15:08:24 +0000 | [diff] [blame] | 553 | wrote = hvc_put_chars(hp->vtermno, (char *)&packet, packet.hdr.len); |
| 554 | if (wrote != packet.hdr.len) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 555 | printk(KERN_ERR "hvsi%i: couldn't send query (%i)!\n", hp->index, |
| 556 | wrote); |
| 557 | return -EIO; |
| 558 | } |
| 559 | |
| 560 | return 0; |
| 561 | } |
| 562 | |
| 563 | static int hvsi_get_mctrl(struct hvsi_struct *hp) |
| 564 | { |
| 565 | int ret; |
| 566 | |
| 567 | set_state(hp, HVSI_WAIT_FOR_MCTRL_RESPONSE); |
| 568 | hvsi_query(hp, VSV_SEND_MODEM_CTL_STATUS); |
| 569 | |
| 570 | ret = hvsi_wait(hp, HVSI_OPEN); |
| 571 | if (ret < 0) { |
| 572 | printk(KERN_ERR "hvsi%i: didn't get modem flags\n", hp->index); |
| 573 | set_state(hp, HVSI_OPEN); |
| 574 | return ret; |
| 575 | } |
| 576 | |
Harvey Harrison | bf9d892 | 2008-04-30 00:55:10 -0700 | [diff] [blame] | 577 | pr_debug("%s: mctrl 0x%x\n", __func__, hp->mctrl); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 578 | |
| 579 | return 0; |
| 580 | } |
| 581 | |
| 582 | /* note that we can only set DTR */ |
| 583 | static int hvsi_set_mctrl(struct hvsi_struct *hp, uint16_t mctrl) |
| 584 | { |
| 585 | struct hvsi_control packet __ALIGNED__; |
| 586 | int wrote; |
| 587 | |
Laurent Dufour | 4807980 | 2015-07-31 11:29:50 +0200 | [diff] [blame] | 588 | packet.hdr.type = VS_CONTROL_PACKET_HEADER; |
| 589 | packet.hdr.seqno = cpu_to_be16(atomic_inc_return(&hp->seqno)); |
Benjamin Herrenschmidt | 048bee7 | 2011-06-16 15:08:24 +0000 | [diff] [blame] | 590 | packet.hdr.len = sizeof(struct hvsi_control); |
Laurent Dufour | 4807980 | 2015-07-31 11:29:50 +0200 | [diff] [blame] | 591 | packet.verb = cpu_to_be16(VSV_SET_MODEM_CTL); |
| 592 | packet.mask = cpu_to_be32(HVSI_TSDTR); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 593 | |
| 594 | if (mctrl & TIOCM_DTR) |
Laurent Dufour | 4807980 | 2015-07-31 11:29:50 +0200 | [diff] [blame] | 595 | packet.word = cpu_to_be32(HVSI_TSDTR); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 596 | |
Benjamin Herrenschmidt | 048bee7 | 2011-06-16 15:08:24 +0000 | [diff] [blame] | 597 | pr_debug("%s: sending %i bytes\n", __func__, packet.hdr.len); |
| 598 | dbg_dump_hex((uint8_t*)&packet, packet.hdr.len); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 599 | |
Benjamin Herrenschmidt | 048bee7 | 2011-06-16 15:08:24 +0000 | [diff] [blame] | 600 | wrote = hvc_put_chars(hp->vtermno, (char *)&packet, packet.hdr.len); |
| 601 | if (wrote != packet.hdr.len) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 602 | printk(KERN_ERR "hvsi%i: couldn't set DTR!\n", hp->index); |
| 603 | return -EIO; |
| 604 | } |
| 605 | |
| 606 | return 0; |
| 607 | } |
| 608 | |
| 609 | static void hvsi_drain_input(struct hvsi_struct *hp) |
| 610 | { |
| 611 | uint8_t buf[HVSI_MAX_READ] __ALIGNED__; |
| 612 | unsigned long end_jiffies = jiffies + HVSI_TIMEOUT; |
| 613 | |
| 614 | while (time_before(end_jiffies, jiffies)) |
| 615 | if (0 == hvsi_read(hp, buf, HVSI_MAX_READ)) |
| 616 | break; |
| 617 | } |
| 618 | |
| 619 | static int hvsi_handshake(struct hvsi_struct *hp) |
| 620 | { |
| 621 | int ret; |
| 622 | |
| 623 | /* |
| 624 | * We could have a CLOSE or other data waiting for us before we even try |
| 625 | * to open; try to throw it all away so we don't get confused. (CLOSE |
| 626 | * is the first message sent up the pipe when the FSP comes online. We |
| 627 | * need to distinguish between "it came up a while ago and we're the first |
| 628 | * user" and "it was just reset before it saw our handshake packet".) |
| 629 | */ |
| 630 | hvsi_drain_input(hp); |
| 631 | |
| 632 | set_state(hp, HVSI_WAIT_FOR_VER_RESPONSE); |
| 633 | ret = hvsi_query(hp, VSV_SEND_VERSION_NUMBER); |
| 634 | if (ret < 0) { |
| 635 | printk(KERN_ERR "hvsi%i: couldn't send version query\n", hp->index); |
| 636 | return ret; |
| 637 | } |
| 638 | |
| 639 | ret = hvsi_wait(hp, HVSI_OPEN); |
| 640 | if (ret < 0) |
| 641 | return ret; |
| 642 | |
| 643 | return 0; |
| 644 | } |
| 645 | |
David Howells | c402895 | 2006-11-22 14:57:56 +0000 | [diff] [blame] | 646 | static void hvsi_handshaker(struct work_struct *work) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 647 | { |
David Howells | c402895 | 2006-11-22 14:57:56 +0000 | [diff] [blame] | 648 | struct hvsi_struct *hp = |
| 649 | container_of(work, struct hvsi_struct, handshaker); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 650 | |
| 651 | if (hvsi_handshake(hp) >= 0) |
| 652 | return; |
| 653 | |
| 654 | printk(KERN_ERR "hvsi%i: re-handshaking failed\n", hp->index); |
| 655 | if (is_console(hp)) { |
| 656 | /* |
| 657 | * ttys will re-attempt the handshake via hvsi_open, but |
| 658 | * the console will not. |
| 659 | */ |
| 660 | printk(KERN_ERR "hvsi%i: lost console!\n", hp->index); |
| 661 | } |
| 662 | } |
| 663 | |
| 664 | static int hvsi_put_chars(struct hvsi_struct *hp, const char *buf, int count) |
| 665 | { |
| 666 | struct hvsi_data packet __ALIGNED__; |
| 667 | int ret; |
| 668 | |
| 669 | BUG_ON(count > HVSI_MAX_OUTGOING_DATA); |
| 670 | |
Benjamin Herrenschmidt | 048bee7 | 2011-06-16 15:08:24 +0000 | [diff] [blame] | 671 | packet.hdr.type = VS_DATA_PACKET_HEADER; |
Laurent Dufour | 4807980 | 2015-07-31 11:29:50 +0200 | [diff] [blame] | 672 | packet.hdr.seqno = cpu_to_be16(atomic_inc_return(&hp->seqno)); |
Benjamin Herrenschmidt | 048bee7 | 2011-06-16 15:08:24 +0000 | [diff] [blame] | 673 | packet.hdr.len = count + sizeof(struct hvsi_header); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 674 | memcpy(&packet.data, buf, count); |
| 675 | |
Benjamin Herrenschmidt | 048bee7 | 2011-06-16 15:08:24 +0000 | [diff] [blame] | 676 | ret = hvc_put_chars(hp->vtermno, (char *)&packet, packet.hdr.len); |
| 677 | if (ret == packet.hdr.len) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 678 | /* return the number of chars written, not the packet length */ |
| 679 | return count; |
| 680 | } |
| 681 | return ret; /* return any errors */ |
| 682 | } |
| 683 | |
| 684 | static void hvsi_close_protocol(struct hvsi_struct *hp) |
| 685 | { |
| 686 | struct hvsi_control packet __ALIGNED__; |
| 687 | |
Benjamin Herrenschmidt | 048bee7 | 2011-06-16 15:08:24 +0000 | [diff] [blame] | 688 | packet.hdr.type = VS_CONTROL_PACKET_HEADER; |
Laurent Dufour | 4807980 | 2015-07-31 11:29:50 +0200 | [diff] [blame] | 689 | packet.hdr.seqno = cpu_to_be16(atomic_inc_return(&hp->seqno)); |
Benjamin Herrenschmidt | 048bee7 | 2011-06-16 15:08:24 +0000 | [diff] [blame] | 690 | packet.hdr.len = 6; |
Laurent Dufour | 4807980 | 2015-07-31 11:29:50 +0200 | [diff] [blame] | 691 | packet.verb = cpu_to_be16(VSV_CLOSE_PROTOCOL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 692 | |
Benjamin Herrenschmidt | 048bee7 | 2011-06-16 15:08:24 +0000 | [diff] [blame] | 693 | pr_debug("%s: sending %i bytes\n", __func__, packet.hdr.len); |
| 694 | dbg_dump_hex((uint8_t*)&packet, packet.hdr.len); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 695 | |
Benjamin Herrenschmidt | 048bee7 | 2011-06-16 15:08:24 +0000 | [diff] [blame] | 696 | hvc_put_chars(hp->vtermno, (char *)&packet, packet.hdr.len); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 697 | } |
| 698 | |
| 699 | static int hvsi_open(struct tty_struct *tty, struct file *filp) |
| 700 | { |
| 701 | struct hvsi_struct *hp; |
| 702 | unsigned long flags; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 703 | int ret; |
| 704 | |
Harvey Harrison | bf9d892 | 2008-04-30 00:55:10 -0700 | [diff] [blame] | 705 | pr_debug("%s\n", __func__); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 706 | |
Jiri Slaby | 410235f | 2012-03-05 14:52:01 +0100 | [diff] [blame] | 707 | hp = &hvsi_ports[tty->index]; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 708 | |
| 709 | tty->driver_data = hp; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 710 | |
| 711 | mb(); |
| 712 | if (hp->state == HVSI_FSP_DIED) |
| 713 | return -EIO; |
| 714 | |
Jiri Slaby | daea440 | 2012-04-02 13:54:30 +0200 | [diff] [blame] | 715 | tty_port_tty_set(&hp->port, tty); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 716 | spin_lock_irqsave(&hp->lock, flags); |
Jiri Slaby | d73a4e7 | 2012-04-02 13:54:28 +0200 | [diff] [blame] | 717 | hp->port.count++; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 718 | atomic_set(&hp->seqno, 0); |
| 719 | h_vio_signal(hp->vtermno, VIO_IRQ_ENABLE); |
| 720 | spin_unlock_irqrestore(&hp->lock, flags); |
| 721 | |
| 722 | if (is_console(hp)) |
| 723 | return 0; /* this has already been handshaked as the console */ |
| 724 | |
| 725 | ret = hvsi_handshake(hp); |
| 726 | if (ret < 0) { |
| 727 | printk(KERN_ERR "%s: HVSI handshaking failed\n", tty->name); |
| 728 | return ret; |
| 729 | } |
| 730 | |
| 731 | ret = hvsi_get_mctrl(hp); |
| 732 | if (ret < 0) { |
| 733 | printk(KERN_ERR "%s: couldn't get initial modem flags\n", tty->name); |
| 734 | return ret; |
| 735 | } |
| 736 | |
| 737 | ret = hvsi_set_mctrl(hp, hp->mctrl | TIOCM_DTR); |
| 738 | if (ret < 0) { |
| 739 | printk(KERN_ERR "%s: couldn't set DTR\n", tty->name); |
| 740 | return ret; |
| 741 | } |
| 742 | |
| 743 | return 0; |
| 744 | } |
| 745 | |
| 746 | /* wait for hvsi_write_worker to empty hp->outbuf */ |
| 747 | static void hvsi_flush_output(struct hvsi_struct *hp) |
| 748 | { |
| 749 | wait_event_timeout(hp->emptyq, (hp->n_outbuf <= 0), HVSI_TIMEOUT); |
| 750 | |
| 751 | /* 'writer' could still be pending if it didn't see n_outbuf = 0 yet */ |
Tejun Heo | 4256599 | 2010-12-24 15:59:07 +0100 | [diff] [blame] | 752 | cancel_delayed_work_sync(&hp->writer); |
Tejun Heo | 4382973 | 2012-08-20 14:51:24 -0700 | [diff] [blame] | 753 | flush_work(&hp->handshaker); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 754 | |
| 755 | /* |
| 756 | * it's also possible that our timeout expired and hvsi_write_worker |
| 757 | * didn't manage to push outbuf. poof. |
| 758 | */ |
| 759 | hp->n_outbuf = 0; |
| 760 | } |
| 761 | |
| 762 | static void hvsi_close(struct tty_struct *tty, struct file *filp) |
| 763 | { |
| 764 | struct hvsi_struct *hp = tty->driver_data; |
| 765 | unsigned long flags; |
| 766 | |
Harvey Harrison | bf9d892 | 2008-04-30 00:55:10 -0700 | [diff] [blame] | 767 | pr_debug("%s\n", __func__); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 768 | |
| 769 | if (tty_hung_up_p(filp)) |
| 770 | return; |
| 771 | |
| 772 | spin_lock_irqsave(&hp->lock, flags); |
| 773 | |
Jiri Slaby | d73a4e7 | 2012-04-02 13:54:28 +0200 | [diff] [blame] | 774 | if (--hp->port.count == 0) { |
Jiri Slaby | daea440 | 2012-04-02 13:54:30 +0200 | [diff] [blame] | 775 | tty_port_tty_set(&hp->port, NULL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 776 | hp->inbuf_end = hp->inbuf; /* discard remaining partial packets */ |
| 777 | |
| 778 | /* only close down connection if it is not the console */ |
| 779 | if (!is_console(hp)) { |
| 780 | h_vio_signal(hp->vtermno, VIO_IRQ_DISABLE); /* no more irqs */ |
| 781 | __set_state(hp, HVSI_CLOSED); |
| 782 | /* |
| 783 | * any data delivered to the tty layer after this will be |
| 784 | * discarded (except for XON/XOFF) |
| 785 | */ |
| 786 | tty->closing = 1; |
| 787 | |
| 788 | spin_unlock_irqrestore(&hp->lock, flags); |
| 789 | |
| 790 | /* let any existing irq handlers finish. no more will start. */ |
| 791 | synchronize_irq(hp->virq); |
| 792 | |
| 793 | /* hvsi_write_worker will re-schedule until outbuf is empty. */ |
| 794 | hvsi_flush_output(hp); |
| 795 | |
| 796 | /* tell FSP to stop sending data */ |
| 797 | hvsi_close_protocol(hp); |
| 798 | |
| 799 | /* |
| 800 | * drain anything FSP is still in the middle of sending, and let |
| 801 | * hvsi_handshake drain the rest on the next open. |
| 802 | */ |
| 803 | hvsi_drain_input(hp); |
| 804 | |
| 805 | spin_lock_irqsave(&hp->lock, flags); |
| 806 | } |
Jiri Slaby | d73a4e7 | 2012-04-02 13:54:28 +0200 | [diff] [blame] | 807 | } else if (hp->port.count < 0) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 808 | printk(KERN_ERR "hvsi_close %lu: oops, count is %d\n", |
Jiri Slaby | d73a4e7 | 2012-04-02 13:54:28 +0200 | [diff] [blame] | 809 | hp - hvsi_ports, hp->port.count); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 810 | |
| 811 | spin_unlock_irqrestore(&hp->lock, flags); |
| 812 | } |
| 813 | |
| 814 | static void hvsi_hangup(struct tty_struct *tty) |
| 815 | { |
| 816 | struct hvsi_struct *hp = tty->driver_data; |
| 817 | unsigned long flags; |
| 818 | |
Harvey Harrison | bf9d892 | 2008-04-30 00:55:10 -0700 | [diff] [blame] | 819 | pr_debug("%s\n", __func__); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 820 | |
Jiri Slaby | daea440 | 2012-04-02 13:54:30 +0200 | [diff] [blame] | 821 | tty_port_tty_set(&hp->port, NULL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 822 | |
Jiri Slaby | daea440 | 2012-04-02 13:54:30 +0200 | [diff] [blame] | 823 | spin_lock_irqsave(&hp->lock, flags); |
Jiri Slaby | d73a4e7 | 2012-04-02 13:54:28 +0200 | [diff] [blame] | 824 | hp->port.count = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 825 | hp->n_outbuf = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 826 | spin_unlock_irqrestore(&hp->lock, flags); |
| 827 | } |
| 828 | |
| 829 | /* called with hp->lock held */ |
| 830 | static void hvsi_push(struct hvsi_struct *hp) |
| 831 | { |
| 832 | int n; |
| 833 | |
| 834 | if (hp->n_outbuf <= 0) |
| 835 | return; |
| 836 | |
| 837 | n = hvsi_put_chars(hp, hp->outbuf, hp->n_outbuf); |
| 838 | if (n > 0) { |
| 839 | /* success */ |
Harvey Harrison | bf9d892 | 2008-04-30 00:55:10 -0700 | [diff] [blame] | 840 | pr_debug("%s: wrote %i chars\n", __func__, n); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 841 | hp->n_outbuf = 0; |
| 842 | } else if (n == -EIO) { |
| 843 | __set_state(hp, HVSI_FSP_DIED); |
| 844 | printk(KERN_ERR "hvsi%i: service processor died\n", hp->index); |
| 845 | } |
| 846 | } |
| 847 | |
| 848 | /* hvsi_write_worker will keep rescheduling itself until outbuf is empty */ |
David Howells | c402895 | 2006-11-22 14:57:56 +0000 | [diff] [blame] | 849 | static void hvsi_write_worker(struct work_struct *work) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 850 | { |
David Howells | c402895 | 2006-11-22 14:57:56 +0000 | [diff] [blame] | 851 | struct hvsi_struct *hp = |
| 852 | container_of(work, struct hvsi_struct, writer.work); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 853 | unsigned long flags; |
| 854 | #ifdef DEBUG |
| 855 | static long start_j = 0; |
| 856 | |
| 857 | if (start_j == 0) |
| 858 | start_j = jiffies; |
| 859 | #endif /* DEBUG */ |
| 860 | |
| 861 | spin_lock_irqsave(&hp->lock, flags); |
| 862 | |
Harvey Harrison | bf9d892 | 2008-04-30 00:55:10 -0700 | [diff] [blame] | 863 | pr_debug("%s: %i chars in buffer\n", __func__, hp->n_outbuf); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 864 | |
| 865 | if (!is_open(hp)) { |
| 866 | /* |
| 867 | * We could have a non-open connection if the service processor died |
| 868 | * while we were busily scheduling ourselves. In that case, it could |
| 869 | * be minutes before the service processor comes back, so only try |
| 870 | * again once a second. |
| 871 | */ |
| 872 | schedule_delayed_work(&hp->writer, HZ); |
| 873 | goto out; |
| 874 | } |
| 875 | |
| 876 | hvsi_push(hp); |
| 877 | if (hp->n_outbuf > 0) |
| 878 | schedule_delayed_work(&hp->writer, 10); |
| 879 | else { |
| 880 | #ifdef DEBUG |
Harvey Harrison | bf9d892 | 2008-04-30 00:55:10 -0700 | [diff] [blame] | 881 | pr_debug("%s: outbuf emptied after %li jiffies\n", __func__, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 882 | jiffies - start_j); |
| 883 | start_j = 0; |
| 884 | #endif /* DEBUG */ |
| 885 | wake_up_all(&hp->emptyq); |
Jiri Slaby | 6aad04f | 2013-03-07 13:12:29 +0100 | [diff] [blame] | 886 | tty_port_tty_wakeup(&hp->port); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 887 | } |
| 888 | |
| 889 | out: |
| 890 | spin_unlock_irqrestore(&hp->lock, flags); |
| 891 | } |
| 892 | |
| 893 | static int hvsi_write_room(struct tty_struct *tty) |
| 894 | { |
Alan Cox | c9f19e9 | 2009-01-02 13:47:26 +0000 | [diff] [blame] | 895 | struct hvsi_struct *hp = tty->driver_data; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 896 | |
| 897 | return N_OUTBUF - hp->n_outbuf; |
| 898 | } |
| 899 | |
| 900 | static int hvsi_chars_in_buffer(struct tty_struct *tty) |
| 901 | { |
Alan Cox | c9f19e9 | 2009-01-02 13:47:26 +0000 | [diff] [blame] | 902 | struct hvsi_struct *hp = tty->driver_data; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 903 | |
| 904 | return hp->n_outbuf; |
| 905 | } |
| 906 | |
| 907 | static int hvsi_write(struct tty_struct *tty, |
| 908 | const unsigned char *buf, int count) |
| 909 | { |
| 910 | struct hvsi_struct *hp = tty->driver_data; |
| 911 | const char *source = buf; |
| 912 | unsigned long flags; |
| 913 | int total = 0; |
| 914 | int origcount = count; |
| 915 | |
| 916 | spin_lock_irqsave(&hp->lock, flags); |
| 917 | |
Harvey Harrison | bf9d892 | 2008-04-30 00:55:10 -0700 | [diff] [blame] | 918 | pr_debug("%s: %i chars in buffer\n", __func__, hp->n_outbuf); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 919 | |
| 920 | if (!is_open(hp)) { |
| 921 | /* we're either closing or not yet open; don't accept data */ |
Harvey Harrison | bf9d892 | 2008-04-30 00:55:10 -0700 | [diff] [blame] | 922 | pr_debug("%s: not open\n", __func__); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 923 | goto out; |
| 924 | } |
| 925 | |
| 926 | /* |
| 927 | * when the hypervisor buffer (16K) fills, data will stay in hp->outbuf |
| 928 | * and hvsi_write_worker will be scheduled. subsequent hvsi_write() calls |
| 929 | * will see there is no room in outbuf and return. |
| 930 | */ |
Jiri Slaby | 28c0447 | 2012-04-02 13:54:29 +0200 | [diff] [blame] | 931 | while ((count > 0) && (hvsi_write_room(tty) > 0)) { |
| 932 | int chunksize = min(count, hvsi_write_room(tty)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 933 | |
| 934 | BUG_ON(hp->n_outbuf < 0); |
| 935 | memcpy(hp->outbuf + hp->n_outbuf, source, chunksize); |
| 936 | hp->n_outbuf += chunksize; |
| 937 | |
| 938 | total += chunksize; |
| 939 | source += chunksize; |
| 940 | count -= chunksize; |
| 941 | hvsi_push(hp); |
| 942 | } |
| 943 | |
| 944 | if (hp->n_outbuf > 0) { |
| 945 | /* |
| 946 | * we weren't able to write it all to the hypervisor. |
| 947 | * schedule another push attempt. |
| 948 | */ |
| 949 | schedule_delayed_work(&hp->writer, 10); |
| 950 | } |
| 951 | |
| 952 | out: |
| 953 | spin_unlock_irqrestore(&hp->lock, flags); |
| 954 | |
| 955 | if (total != origcount) |
Harvey Harrison | bf9d892 | 2008-04-30 00:55:10 -0700 | [diff] [blame] | 956 | pr_debug("%s: wanted %i, only wrote %i\n", __func__, origcount, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 957 | total); |
| 958 | |
| 959 | return total; |
| 960 | } |
| 961 | |
| 962 | /* |
| 963 | * I have never seen throttle or unthrottle called, so this little throttle |
| 964 | * buffering scheme may or may not work. |
| 965 | */ |
| 966 | static void hvsi_throttle(struct tty_struct *tty) |
| 967 | { |
Alan Cox | c9f19e9 | 2009-01-02 13:47:26 +0000 | [diff] [blame] | 968 | struct hvsi_struct *hp = tty->driver_data; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 969 | |
Harvey Harrison | bf9d892 | 2008-04-30 00:55:10 -0700 | [diff] [blame] | 970 | pr_debug("%s\n", __func__); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 971 | |
| 972 | h_vio_signal(hp->vtermno, VIO_IRQ_DISABLE); |
| 973 | } |
| 974 | |
| 975 | static void hvsi_unthrottle(struct tty_struct *tty) |
| 976 | { |
Alan Cox | c9f19e9 | 2009-01-02 13:47:26 +0000 | [diff] [blame] | 977 | struct hvsi_struct *hp = tty->driver_data; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 978 | unsigned long flags; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 979 | |
Harvey Harrison | bf9d892 | 2008-04-30 00:55:10 -0700 | [diff] [blame] | 980 | pr_debug("%s\n", __func__); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 981 | |
| 982 | spin_lock_irqsave(&hp->lock, flags); |
| 983 | if (hp->n_throttle) { |
Jiri Slaby | 92a19f9 | 2013-01-03 15:53:03 +0100 | [diff] [blame] | 984 | hvsi_send_overflow(hp); |
Jiri Slaby | 2e124b4 | 2013-01-03 15:53:06 +0100 | [diff] [blame] | 985 | tty_flip_buffer_push(&hp->port); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 986 | } |
| 987 | spin_unlock_irqrestore(&hp->lock, flags); |
| 988 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 989 | |
| 990 | h_vio_signal(hp->vtermno, VIO_IRQ_ENABLE); |
| 991 | } |
| 992 | |
Alan Cox | 60b33c1 | 2011-02-14 16:26:14 +0000 | [diff] [blame] | 993 | static int hvsi_tiocmget(struct tty_struct *tty) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 994 | { |
Alan Cox | c9f19e9 | 2009-01-02 13:47:26 +0000 | [diff] [blame] | 995 | struct hvsi_struct *hp = tty->driver_data; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 996 | |
| 997 | hvsi_get_mctrl(hp); |
| 998 | return hp->mctrl; |
| 999 | } |
| 1000 | |
Alan Cox | 20b9d17 | 2011-02-14 16:26:50 +0000 | [diff] [blame] | 1001 | static int hvsi_tiocmset(struct tty_struct *tty, |
| 1002 | unsigned int set, unsigned int clear) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1003 | { |
Alan Cox | c9f19e9 | 2009-01-02 13:47:26 +0000 | [diff] [blame] | 1004 | struct hvsi_struct *hp = tty->driver_data; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1005 | unsigned long flags; |
| 1006 | uint16_t new_mctrl; |
| 1007 | |
| 1008 | /* we can only alter DTR */ |
| 1009 | clear &= TIOCM_DTR; |
| 1010 | set &= TIOCM_DTR; |
| 1011 | |
| 1012 | spin_lock_irqsave(&hp->lock, flags); |
| 1013 | |
| 1014 | new_mctrl = (hp->mctrl & ~clear) | set; |
| 1015 | |
| 1016 | if (hp->mctrl != new_mctrl) { |
| 1017 | hvsi_set_mctrl(hp, new_mctrl); |
| 1018 | hp->mctrl = new_mctrl; |
| 1019 | } |
| 1020 | spin_unlock_irqrestore(&hp->lock, flags); |
| 1021 | |
| 1022 | return 0; |
| 1023 | } |
| 1024 | |
| 1025 | |
Jeff Dike | b68e31d | 2006-10-02 02:17:18 -0700 | [diff] [blame] | 1026 | static const struct tty_operations hvsi_ops = { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1027 | .open = hvsi_open, |
| 1028 | .close = hvsi_close, |
| 1029 | .write = hvsi_write, |
| 1030 | .hangup = hvsi_hangup, |
| 1031 | .write_room = hvsi_write_room, |
| 1032 | .chars_in_buffer = hvsi_chars_in_buffer, |
| 1033 | .throttle = hvsi_throttle, |
| 1034 | .unthrottle = hvsi_unthrottle, |
| 1035 | .tiocmget = hvsi_tiocmget, |
| 1036 | .tiocmset = hvsi_tiocmset, |
| 1037 | }; |
| 1038 | |
| 1039 | static int __init hvsi_init(void) |
| 1040 | { |
| 1041 | int i; |
| 1042 | |
| 1043 | hvsi_driver = alloc_tty_driver(hvsi_count); |
| 1044 | if (!hvsi_driver) |
| 1045 | return -ENOMEM; |
| 1046 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1047 | hvsi_driver->driver_name = "hvsi"; |
| 1048 | hvsi_driver->name = "hvsi"; |
| 1049 | hvsi_driver->major = HVSI_MAJOR; |
| 1050 | hvsi_driver->minor_start = HVSI_MINOR; |
| 1051 | hvsi_driver->type = TTY_DRIVER_TYPE_SYSTEM; |
| 1052 | hvsi_driver->init_termios = tty_std_termios; |
| 1053 | hvsi_driver->init_termios.c_cflag = B9600 | CS8 | CREAD | HUPCL; |
Alan Cox | 606d099 | 2006-12-08 02:38:45 -0800 | [diff] [blame] | 1054 | hvsi_driver->init_termios.c_ispeed = 9600; |
| 1055 | hvsi_driver->init_termios.c_ospeed = 9600; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1056 | hvsi_driver->flags = TTY_DRIVER_REAL_RAW; |
| 1057 | tty_set_operations(hvsi_driver, &hvsi_ops); |
| 1058 | |
| 1059 | for (i=0; i < hvsi_count; i++) { |
| 1060 | struct hvsi_struct *hp = &hvsi_ports[i]; |
| 1061 | int ret = 1; |
| 1062 | |
Jiri Slaby | b19e2ca | 2012-08-07 21:47:51 +0200 | [diff] [blame] | 1063 | tty_port_link_device(&hp->port, hvsi_driver, i); |
| 1064 | |
Yong Zhang | 9cfb5c0 | 2011-09-22 16:59:15 +0800 | [diff] [blame] | 1065 | ret = request_irq(hp->virq, hvsi_interrupt, 0, "hvsi", hp); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1066 | if (ret) |
| 1067 | printk(KERN_ERR "HVSI: couldn't reserve irq 0x%x (error %i)\n", |
| 1068 | hp->virq, ret); |
| 1069 | } |
| 1070 | hvsi_wait = wait_for_state; /* irqs active now */ |
| 1071 | |
| 1072 | if (tty_register_driver(hvsi_driver)) |
| 1073 | panic("Couldn't register hvsi console driver\n"); |
| 1074 | |
Olof Johansson | 8b6a7b2 | 2006-04-12 15:19:50 -0500 | [diff] [blame] | 1075 | printk(KERN_DEBUG "HVSI: registered %i devices\n", hvsi_count); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1076 | |
| 1077 | return 0; |
| 1078 | } |
| 1079 | device_initcall(hvsi_init); |
| 1080 | |
| 1081 | /***** console (not tty) code: *****/ |
| 1082 | |
| 1083 | static void hvsi_console_print(struct console *console, const char *buf, |
| 1084 | unsigned int count) |
| 1085 | { |
| 1086 | struct hvsi_struct *hp = &hvsi_ports[console->index]; |
| 1087 | char c[HVSI_MAX_OUTGOING_DATA] __ALIGNED__; |
| 1088 | unsigned int i = 0, n = 0; |
| 1089 | int ret, donecr = 0; |
| 1090 | |
| 1091 | mb(); |
| 1092 | if (!is_open(hp)) |
| 1093 | return; |
| 1094 | |
| 1095 | /* |
| 1096 | * ugh, we have to translate LF -> CRLF ourselves, in place. |
| 1097 | * copied from hvc_console.c: |
| 1098 | */ |
| 1099 | while (count > 0 || i > 0) { |
| 1100 | if (count > 0 && i < sizeof(c)) { |
| 1101 | if (buf[n] == '\n' && !donecr) { |
| 1102 | c[i++] = '\r'; |
| 1103 | donecr = 1; |
| 1104 | } else { |
| 1105 | c[i++] = buf[n++]; |
| 1106 | donecr = 0; |
| 1107 | --count; |
| 1108 | } |
| 1109 | } else { |
| 1110 | ret = hvsi_put_chars(hp, c, i); |
| 1111 | if (ret < 0) |
| 1112 | i = 0; |
| 1113 | i -= ret; |
| 1114 | } |
| 1115 | } |
| 1116 | } |
| 1117 | |
| 1118 | static struct tty_driver *hvsi_console_device(struct console *console, |
| 1119 | int *index) |
| 1120 | { |
| 1121 | *index = console->index; |
| 1122 | return hvsi_driver; |
| 1123 | } |
| 1124 | |
| 1125 | static int __init hvsi_console_setup(struct console *console, char *options) |
| 1126 | { |
Roel Kluin | 7286565 | 2009-08-06 13:00:37 +0000 | [diff] [blame] | 1127 | struct hvsi_struct *hp; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1128 | int ret; |
| 1129 | |
| 1130 | if (console->index < 0 || console->index >= hvsi_count) |
| 1131 | return -1; |
Roel Kluin | 7286565 | 2009-08-06 13:00:37 +0000 | [diff] [blame] | 1132 | hp = &hvsi_ports[console->index]; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1133 | |
| 1134 | /* give the FSP a chance to change the baud rate when we re-open */ |
| 1135 | hvsi_close_protocol(hp); |
| 1136 | |
| 1137 | ret = hvsi_handshake(hp); |
| 1138 | if (ret < 0) |
| 1139 | return ret; |
| 1140 | |
| 1141 | ret = hvsi_get_mctrl(hp); |
| 1142 | if (ret < 0) |
| 1143 | return ret; |
| 1144 | |
| 1145 | ret = hvsi_set_mctrl(hp, hp->mctrl | TIOCM_DTR); |
| 1146 | if (ret < 0) |
| 1147 | return ret; |
| 1148 | |
| 1149 | hp->flags |= HVSI_CONSOLE; |
| 1150 | |
| 1151 | return 0; |
| 1152 | } |
| 1153 | |
Chris Metcalf | 4455b11 | 2010-07-06 08:03:16 +0000 | [diff] [blame] | 1154 | static struct console hvsi_console = { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1155 | .name = "hvsi", |
| 1156 | .write = hvsi_console_print, |
| 1157 | .device = hvsi_console_device, |
| 1158 | .setup = hvsi_console_setup, |
| 1159 | .flags = CON_PRINTBUFFER, |
| 1160 | .index = -1, |
| 1161 | }; |
| 1162 | |
| 1163 | static int __init hvsi_console_init(void) |
| 1164 | { |
| 1165 | struct device_node *vty; |
| 1166 | |
| 1167 | hvsi_wait = poll_for_state; /* no irqs yet; must poll */ |
| 1168 | |
| 1169 | /* search device tree for vty nodes */ |
Wei Yongjun | 074d35c | 2012-12-04 00:16:18 -0500 | [diff] [blame] | 1170 | for_each_compatible_node(vty, "serial", "hvterm-protocol") { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1171 | struct hvsi_struct *hp; |
Laurent Dufour | 4807980 | 2015-07-31 11:29:50 +0200 | [diff] [blame] | 1172 | const __be32 *vtermno, *irq; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1173 | |
Stephen Rothwell | 01b2726 | 2007-04-27 13:41:15 +1000 | [diff] [blame] | 1174 | vtermno = of_get_property(vty, "reg", NULL); |
| 1175 | irq = of_get_property(vty, "interrupts", NULL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1176 | if (!vtermno || !irq) |
| 1177 | continue; |
| 1178 | |
| 1179 | if (hvsi_count >= MAX_NR_HVSI_CONSOLES) { |
| 1180 | of_node_put(vty); |
| 1181 | break; |
| 1182 | } |
| 1183 | |
| 1184 | hp = &hvsi_ports[hvsi_count]; |
David Howells | c402895 | 2006-11-22 14:57:56 +0000 | [diff] [blame] | 1185 | INIT_DELAYED_WORK(&hp->writer, hvsi_write_worker); |
| 1186 | INIT_WORK(&hp->handshaker, hvsi_handshaker); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1187 | init_waitqueue_head(&hp->emptyq); |
| 1188 | init_waitqueue_head(&hp->stateq); |
| 1189 | spin_lock_init(&hp->lock); |
Jiri Slaby | d73a4e7 | 2012-04-02 13:54:28 +0200 | [diff] [blame] | 1190 | tty_port_init(&hp->port); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1191 | hp->index = hvsi_count; |
| 1192 | hp->inbuf_end = hp->inbuf; |
| 1193 | hp->state = HVSI_CLOSED; |
Laurent Dufour | 4807980 | 2015-07-31 11:29:50 +0200 | [diff] [blame] | 1194 | hp->vtermno = be32_to_cpup(vtermno); |
| 1195 | hp->virq = irq_create_mapping(NULL, be32_to_cpup(irq)); |
Alan Cox | d4e33fa | 2012-01-26 17:44:09 +0000 | [diff] [blame] | 1196 | if (hp->virq == 0) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1197 | printk(KERN_ERR "%s: couldn't create irq mapping for 0x%x\n", |
Laurent Dufour | 4807980 | 2015-07-31 11:29:50 +0200 | [diff] [blame] | 1198 | __func__, be32_to_cpup(irq)); |
Jiri Slaby | 191c5f1 | 2012-11-15 09:49:56 +0100 | [diff] [blame] | 1199 | tty_port_destroy(&hp->port); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1200 | continue; |
Benjamin Herrenschmidt | 0ebfff1 | 2006-07-03 21:36:01 +1000 | [diff] [blame] | 1201 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1202 | |
| 1203 | hvsi_count++; |
| 1204 | } |
| 1205 | |
| 1206 | if (hvsi_count) |
Chris Metcalf | 4455b11 | 2010-07-06 08:03:16 +0000 | [diff] [blame] | 1207 | register_console(&hvsi_console); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1208 | return 0; |
| 1209 | } |
| 1210 | console_initcall(hvsi_console_init); |