You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
1320 lines
32 KiB
1320 lines
32 KiB
/*
|
|
* Copyright (C) 2004 Hollis Blanchard <hollisb@us.ibm.com>, IBM
|
|
*
|
|
* This program is free software; you can redistribute it and/or modify
|
|
* it under the terms of the GNU General Public License as published by
|
|
* the Free Software Foundation; either version 2 of the License, or
|
|
* (at your option) any later version.
|
|
*
|
|
* This program is distributed in the hope that it will be useful,
|
|
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
* GNU General Public License for more details.
|
|
*
|
|
* You should have received a copy of the GNU General Public License
|
|
* along with this program; if not, write to the Free Software
|
|
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
|
|
*/
|
|
|
|
/* Host Virtual Serial Interface (HVSI) is a protocol between the hosted OS
|
|
* and the service processor on IBM pSeries servers. On these servers, there
|
|
* are no serial ports under the OS's control, and sometimes there is no other
|
|
* console available either. However, the service processor has two standard
|
|
* serial ports, so this over-complicated protocol allows the OS to control
|
|
* those ports by proxy.
|
|
*
|
|
* Besides data, the procotol supports the reading/writing of the serial
|
|
* port's DTR line, and the reading of the CD line. This is to allow the OS to
|
|
* control a modem attached to the service processor's serial port. Note that
|
|
* the OS cannot change the speed of the port through this protocol.
|
|
*/
|
|
|
|
#undef DEBUG
|
|
|
|
#include <linux/console.h>
|
|
#include <linux/ctype.h>
|
|
#include <linux/delay.h>
|
|
#include <linux/init.h>
|
|
#include <linux/interrupt.h>
|
|
#include <linux/module.h>
|
|
#include <linux/major.h>
|
|
#include <linux/kernel.h>
|
|
#include <linux/sched.h>
|
|
#include <linux/spinlock.h>
|
|
#include <linux/sysrq.h>
|
|
#include <linux/tty.h>
|
|
#include <linux/tty_flip.h>
|
|
#include <asm/hvcall.h>
|
|
#include <asm/hvconsole.h>
|
|
#include <asm/prom.h>
|
|
#include <asm/uaccess.h>
|
|
#include <asm/vio.h>
|
|
#include <asm/param.h>
|
|
|
|
#define HVSI_MAJOR 229
|
|
#define HVSI_MINOR 128
|
|
#define MAX_NR_HVSI_CONSOLES 4
|
|
|
|
#define HVSI_TIMEOUT (5*HZ)
|
|
#define HVSI_VERSION 1
|
|
#define HVSI_MAX_PACKET 256
|
|
#define HVSI_MAX_READ 16
|
|
#define HVSI_MAX_OUTGOING_DATA 12
|
|
#define N_OUTBUF 12
|
|
|
|
/*
|
|
* we pass data via two 8-byte registers, so we would like our char arrays
|
|
* properly aligned for those loads.
|
|
*/
|
|
#define __ALIGNED__ __attribute__((__aligned__(sizeof(long))))
|
|
|
|
struct hvsi_struct {
|
|
struct work_struct writer;
|
|
struct work_struct handshaker;
|
|
wait_queue_head_t emptyq; /* woken when outbuf is emptied */
|
|
wait_queue_head_t stateq; /* woken when HVSI state changes */
|
|
spinlock_t lock;
|
|
int index;
|
|
struct tty_struct *tty;
|
|
unsigned int count;
|
|
uint8_t throttle_buf[128];
|
|
uint8_t outbuf[N_OUTBUF]; /* to implement write_room and chars_in_buffer */
|
|
/* inbuf is for packet reassembly. leave a little room for leftovers. */
|
|
uint8_t inbuf[HVSI_MAX_PACKET + HVSI_MAX_READ];
|
|
uint8_t *inbuf_end;
|
|
int n_throttle;
|
|
int n_outbuf;
|
|
uint32_t vtermno;
|
|
uint32_t virq;
|
|
atomic_t seqno; /* HVSI packet sequence number */
|
|
uint16_t mctrl;
|
|
uint8_t state; /* HVSI protocol state */
|
|
uint8_t flags;
|
|
#ifdef CONFIG_MAGIC_SYSRQ
|
|
uint8_t sysrq;
|
|
#endif /* CONFIG_MAGIC_SYSRQ */
|
|
};
|
|
static struct hvsi_struct hvsi_ports[MAX_NR_HVSI_CONSOLES];
|
|
|
|
static struct tty_driver *hvsi_driver;
|
|
static int hvsi_count;
|
|
static int (*hvsi_wait)(struct hvsi_struct *hp, int state);
|
|
|
|
enum HVSI_PROTOCOL_STATE {
|
|
HVSI_CLOSED,
|
|
HVSI_WAIT_FOR_VER_RESPONSE,
|
|
HVSI_WAIT_FOR_VER_QUERY,
|
|
HVSI_OPEN,
|
|
HVSI_WAIT_FOR_MCTRL_RESPONSE,
|
|
HVSI_FSP_DIED,
|
|
};
|
|
#define HVSI_CONSOLE 0x1
|
|
|
|
#define VS_DATA_PACKET_HEADER 0xff
|
|
#define VS_CONTROL_PACKET_HEADER 0xfe
|
|
#define VS_QUERY_PACKET_HEADER 0xfd
|
|
#define VS_QUERY_RESPONSE_PACKET_HEADER 0xfc
|
|
|
|
/* control verbs */
|
|
#define VSV_SET_MODEM_CTL 1 /* to service processor only */
|
|
#define VSV_MODEM_CTL_UPDATE 2 /* from service processor only */
|
|
#define VSV_CLOSE_PROTOCOL 3
|
|
|
|
/* query verbs */
|
|
#define VSV_SEND_VERSION_NUMBER 1
|
|
#define VSV_SEND_MODEM_CTL_STATUS 2
|
|
|
|
/* yes, these masks are not consecutive. */
|
|
#define HVSI_TSDTR 0x01
|
|
#define HVSI_TSCD 0x20
|
|
|
|
struct hvsi_header {
|
|
uint8_t type;
|
|
uint8_t len;
|
|
uint16_t seqno;
|
|
} __attribute__((packed));
|
|
|
|
struct hvsi_data {
|
|
uint8_t type;
|
|
uint8_t len;
|
|
uint16_t seqno;
|
|
uint8_t data[HVSI_MAX_OUTGOING_DATA];
|
|
} __attribute__((packed));
|
|
|
|
struct hvsi_control {
|
|
uint8_t type;
|
|
uint8_t len;
|
|
uint16_t seqno;
|
|
uint16_t verb;
|
|
/* optional depending on verb: */
|
|
uint32_t word;
|
|
uint32_t mask;
|
|
} __attribute__((packed));
|
|
|
|
struct hvsi_query {
|
|
uint8_t type;
|
|
uint8_t len;
|
|
uint16_t seqno;
|
|
uint16_t verb;
|
|
} __attribute__((packed));
|
|
|
|
struct hvsi_query_response {
|
|
uint8_t type;
|
|
uint8_t len;
|
|
uint16_t seqno;
|
|
uint16_t verb;
|
|
uint16_t query_seqno;
|
|
union {
|
|
uint8_t version;
|
|
uint32_t mctrl_word;
|
|
} u;
|
|
} __attribute__((packed));
|
|
|
|
|
|
|
|
static inline int is_console(struct hvsi_struct *hp)
|
|
{
|
|
return hp->flags & HVSI_CONSOLE;
|
|
}
|
|
|
|
static inline int is_open(struct hvsi_struct *hp)
|
|
{
|
|
/* if we're waiting for an mctrl then we're already open */
|
|
return (hp->state == HVSI_OPEN)
|
|
|| (hp->state == HVSI_WAIT_FOR_MCTRL_RESPONSE);
|
|
}
|
|
|
|
static inline void print_state(struct hvsi_struct *hp)
|
|
{
|
|
#ifdef DEBUG
|
|
static const char *state_names[] = {
|
|
"HVSI_CLOSED",
|
|
"HVSI_WAIT_FOR_VER_RESPONSE",
|
|
"HVSI_WAIT_FOR_VER_QUERY",
|
|
"HVSI_OPEN",
|
|
"HVSI_WAIT_FOR_MCTRL_RESPONSE",
|
|
"HVSI_FSP_DIED",
|
|
};
|
|
const char *name = state_names[hp->state];
|
|
|
|
if (hp->state > (sizeof(state_names)/sizeof(char*)))
|
|
name = "UNKNOWN";
|
|
|
|
pr_debug("hvsi%i: state = %s\n", hp->index, name);
|
|
#endif /* DEBUG */
|
|
}
|
|
|
|
static inline void __set_state(struct hvsi_struct *hp, int state)
|
|
{
|
|
hp->state = state;
|
|
print_state(hp);
|
|
wake_up_all(&hp->stateq);
|
|
}
|
|
|
|
static inline void set_state(struct hvsi_struct *hp, int state)
|
|
{
|
|
unsigned long flags;
|
|
|
|
spin_lock_irqsave(&hp->lock, flags);
|
|
__set_state(hp, state);
|
|
spin_unlock_irqrestore(&hp->lock, flags);
|
|
}
|
|
|
|
static inline int len_packet(const uint8_t *packet)
|
|
{
|
|
return (int)((struct hvsi_header *)packet)->len;
|
|
}
|
|
|
|
static inline int is_header(const uint8_t *packet)
|
|
{
|
|
struct hvsi_header *header = (struct hvsi_header *)packet;
|
|
return header->type >= VS_QUERY_RESPONSE_PACKET_HEADER;
|
|
}
|
|
|
|
static inline int got_packet(const struct hvsi_struct *hp, uint8_t *packet)
|
|
{
|
|
if (hp->inbuf_end < packet + sizeof(struct hvsi_header))
|
|
return 0; /* don't even have the packet header */
|
|
|
|
if (hp->inbuf_end < (packet + len_packet(packet)))
|
|
return 0; /* don't have the rest of the packet */
|
|
|
|
return 1;
|
|
}
|
|
|
|
/* shift remaining bytes in packetbuf down */
|
|
static void compact_inbuf(struct hvsi_struct *hp, uint8_t *read_to)
|
|
{
|
|
int remaining = (int)(hp->inbuf_end - read_to);
|
|
|
|
pr_debug("%s: %i chars remain\n", __FUNCTION__, remaining);
|
|
|
|
if (read_to != hp->inbuf)
|
|
memmove(hp->inbuf, read_to, remaining);
|
|
|
|
hp->inbuf_end = hp->inbuf + remaining;
|
|
}
|
|
|
|
#ifdef DEBUG
|
|
#define dbg_dump_packet(packet) dump_packet(packet)
|
|
#define dbg_dump_hex(data, len) dump_hex(data, len)
|
|
#else
|
|
#define dbg_dump_packet(packet) do { } while (0)
|
|
#define dbg_dump_hex(data, len) do { } while (0)
|
|
#endif
|
|
|
|
static void dump_hex(const uint8_t *data, int len)
|
|
{
|
|
int i;
|
|
|
|
printk(" ");
|
|
for (i=0; i < len; i++)
|
|
printk("%.2x", data[i]);
|
|
|
|
printk("\n ");
|
|
for (i=0; i < len; i++) {
|
|
if (isprint(data[i]))
|
|
printk("%c", data[i]);
|
|
else
|
|
printk(".");
|
|
}
|
|
printk("\n");
|
|
}
|
|
|
|
static void dump_packet(uint8_t *packet)
|
|
{
|
|
struct hvsi_header *header = (struct hvsi_header *)packet;
|
|
|
|
printk("type 0x%x, len %i, seqno %i:\n", header->type, header->len,
|
|
header->seqno);
|
|
|
|
dump_hex(packet, header->len);
|
|
}
|
|
|
|
/* can't use hvc_get_chars because that strips CRs */
|
|
static int hvsi_read(struct hvsi_struct *hp, char *buf, int count)
|
|
{
|
|
unsigned long got;
|
|
|
|
if (plpar_hcall(H_GET_TERM_CHAR, hp->vtermno, 0, 0, 0, &got,
|
|
(unsigned long *)buf, (unsigned long *)buf+1) == H_Success)
|
|
return got;
|
|
return 0;
|
|
}
|
|
|
|
static void hvsi_recv_control(struct hvsi_struct *hp, uint8_t *packet,
|
|
struct tty_struct **to_hangup, struct hvsi_struct **to_handshake)
|
|
{
|
|
struct hvsi_control *header = (struct hvsi_control *)packet;
|
|
|
|
switch (header->verb) {
|
|
case VSV_MODEM_CTL_UPDATE:
|
|
if ((header->word & HVSI_TSCD) == 0) {
|
|
/* CD went away; no more connection */
|
|
pr_debug("hvsi%i: CD dropped\n", hp->index);
|
|
hp->mctrl &= TIOCM_CD;
|
|
if (!(hp->tty->flags & CLOCAL))
|
|
*to_hangup = hp->tty;
|
|
}
|
|
break;
|
|
case VSV_CLOSE_PROTOCOL:
|
|
pr_debug("hvsi%i: service processor came back\n", hp->index);
|
|
if (hp->state != HVSI_CLOSED) {
|
|
*to_handshake = hp;
|
|
}
|
|
break;
|
|
default:
|
|
printk(KERN_WARNING "hvsi%i: unknown HVSI control packet: ",
|
|
hp->index);
|
|
dump_packet(packet);
|
|
break;
|
|
}
|
|
}
|
|
|
|
static void hvsi_recv_response(struct hvsi_struct *hp, uint8_t *packet)
|
|
{
|
|
struct hvsi_query_response *resp = (struct hvsi_query_response *)packet;
|
|
|
|
switch (hp->state) {
|
|
case HVSI_WAIT_FOR_VER_RESPONSE:
|
|
__set_state(hp, HVSI_WAIT_FOR_VER_QUERY);
|
|
break;
|
|
case HVSI_WAIT_FOR_MCTRL_RESPONSE:
|
|
hp->mctrl = 0;
|
|
if (resp->u.mctrl_word & HVSI_TSDTR)
|
|
hp->mctrl |= TIOCM_DTR;
|
|
if (resp->u.mctrl_word & HVSI_TSCD)
|
|
hp->mctrl |= TIOCM_CD;
|
|
__set_state(hp, HVSI_OPEN);
|
|
break;
|
|
default:
|
|
printk(KERN_ERR "hvsi%i: unexpected query response: ", hp->index);
|
|
dump_packet(packet);
|
|
break;
|
|
}
|
|
}
|
|
|
|
/* respond to service processor's version query */
|
|
static int hvsi_version_respond(struct hvsi_struct *hp, uint16_t query_seqno)
|
|
{
|
|
struct hvsi_query_response packet __ALIGNED__;
|
|
int wrote;
|
|
|
|
packet.type = VS_QUERY_RESPONSE_PACKET_HEADER;
|
|
packet.len = sizeof(struct hvsi_query_response);
|
|
packet.seqno = atomic_inc_return(&hp->seqno);
|
|
packet.verb = VSV_SEND_VERSION_NUMBER;
|
|
packet.u.version = HVSI_VERSION;
|
|
packet.query_seqno = query_seqno+1;
|
|
|
|
pr_debug("%s: sending %i bytes\n", __FUNCTION__, packet.len);
|
|
dbg_dump_hex((uint8_t*)&packet, packet.len);
|
|
|
|
wrote = hvc_put_chars(hp->vtermno, (char *)&packet, packet.len);
|
|
if (wrote != packet.len) {
|
|
printk(KERN_ERR "hvsi%i: couldn't send query response!\n",
|
|
hp->index);
|
|
return -EIO;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static void hvsi_recv_query(struct hvsi_struct *hp, uint8_t *packet)
|
|
{
|
|
struct hvsi_query *query = (struct hvsi_query *)packet;
|
|
|
|
switch (hp->state) {
|
|
case HVSI_WAIT_FOR_VER_QUERY:
|
|
hvsi_version_respond(hp, query->seqno);
|
|
__set_state(hp, HVSI_OPEN);
|
|
break;
|
|
default:
|
|
printk(KERN_ERR "hvsi%i: unexpected query: ", hp->index);
|
|
dump_packet(packet);
|
|
break;
|
|
}
|
|
}
|
|
|
|
static void hvsi_insert_chars(struct hvsi_struct *hp, const char *buf, int len)
|
|
{
|
|
int i;
|
|
|
|
for (i=0; i < len; i++) {
|
|
char c = buf[i];
|
|
#ifdef CONFIG_MAGIC_SYSRQ
|
|
if (c == '\0') {
|
|
hp->sysrq = 1;
|
|
continue;
|
|
} else if (hp->sysrq) {
|
|
handle_sysrq(c, NULL, hp->tty);
|
|
hp->sysrq = 0;
|
|
continue;
|
|
}
|
|
#endif /* CONFIG_MAGIC_SYSRQ */
|
|
tty_insert_flip_char(hp->tty, c, 0);
|
|
}
|
|
}
|
|
|
|
/*
|
|
* We could get 252 bytes of data at once here. But the tty layer only
|
|
* throttles us at TTY_THRESHOLD_THROTTLE (128) bytes, so we could overflow
|
|
* it. Accordingly we won't send more than 128 bytes at a time to the flip
|
|
* buffer, which will give the tty buffer a chance to throttle us. Should the
|
|
* value of TTY_THRESHOLD_THROTTLE change in n_tty.c, this code should be
|
|
* revisited.
|
|
*/
|
|
#define TTY_THRESHOLD_THROTTLE 128
|
|
static struct tty_struct *hvsi_recv_data(struct hvsi_struct *hp,
|
|
const uint8_t *packet)
|
|
{
|
|
const struct hvsi_header *header = (const struct hvsi_header *)packet;
|
|
const uint8_t *data = packet + sizeof(struct hvsi_header);
|
|
int datalen = header->len - sizeof(struct hvsi_header);
|
|
int overflow = datalen - TTY_THRESHOLD_THROTTLE;
|
|
|
|
pr_debug("queueing %i chars '%.*s'\n", datalen, datalen, data);
|
|
|
|
if (datalen == 0)
|
|
return NULL;
|
|
|
|
if (overflow > 0) {
|
|
pr_debug("%s: got >TTY_THRESHOLD_THROTTLE bytes\n", __FUNCTION__);
|
|
datalen = TTY_THRESHOLD_THROTTLE;
|
|
}
|
|
|
|
hvsi_insert_chars(hp, data, datalen);
|
|
|
|
if (overflow > 0) {
|
|
/*
|
|
* we still have more data to deliver, so we need to save off the
|
|
* overflow and send it later
|
|
*/
|
|
pr_debug("%s: deferring overflow\n", __FUNCTION__);
|
|
memcpy(hp->throttle_buf, data + TTY_THRESHOLD_THROTTLE, overflow);
|
|
hp->n_throttle = overflow;
|
|
}
|
|
|
|
return hp->tty;
|
|
}
|
|
|
|
/*
|
|
* Returns true/false indicating data successfully read from hypervisor.
|
|
* Used both to get packets for tty connections and to advance the state
|
|
* machine during console handshaking (in which case tty = NULL and we ignore
|
|
* incoming data).
|
|
*/
|
|
static int hvsi_load_chunk(struct hvsi_struct *hp, struct tty_struct **flip,
|
|
struct tty_struct **hangup, struct hvsi_struct **handshake)
|
|
{
|
|
uint8_t *packet = hp->inbuf;
|
|
int chunklen;
|
|
|
|
*flip = NULL;
|
|
*hangup = NULL;
|
|
*handshake = NULL;
|
|
|
|
chunklen = hvsi_read(hp, hp->inbuf_end, HVSI_MAX_READ);
|
|
if (chunklen == 0) {
|
|
pr_debug("%s: 0-length read\n", __FUNCTION__);
|
|
return 0;
|
|
}
|
|
|
|
pr_debug("%s: got %i bytes\n", __FUNCTION__, chunklen);
|
|
dbg_dump_hex(hp->inbuf_end, chunklen);
|
|
|
|
hp->inbuf_end += chunklen;
|
|
|
|
/* handle all completed packets */
|
|
while ((packet < hp->inbuf_end) && got_packet(hp, packet)) {
|
|
struct hvsi_header *header = (struct hvsi_header *)packet;
|
|
|
|
if (!is_header(packet)) {
|
|
printk(KERN_ERR "hvsi%i: got malformed packet\n", hp->index);
|
|
/* skip bytes until we find a header or run out of data */
|
|
while ((packet < hp->inbuf_end) && (!is_header(packet)))
|
|
packet++;
|
|
continue;
|
|
}
|
|
|
|
pr_debug("%s: handling %i-byte packet\n", __FUNCTION__,
|
|
len_packet(packet));
|
|
dbg_dump_packet(packet);
|
|
|
|
switch (header->type) {
|
|
case VS_DATA_PACKET_HEADER:
|
|
if (!is_open(hp))
|
|
break;
|
|
if (hp->tty == NULL)
|
|
break; /* no tty buffer to put data in */
|
|
*flip = hvsi_recv_data(hp, packet);
|
|
break;
|
|
case VS_CONTROL_PACKET_HEADER:
|
|
hvsi_recv_control(hp, packet, hangup, handshake);
|
|
break;
|
|
case VS_QUERY_RESPONSE_PACKET_HEADER:
|
|
hvsi_recv_response(hp, packet);
|
|
break;
|
|
case VS_QUERY_PACKET_HEADER:
|
|
hvsi_recv_query(hp, packet);
|
|
break;
|
|
default:
|
|
printk(KERN_ERR "hvsi%i: unknown HVSI packet type 0x%x\n",
|
|
hp->index, header->type);
|
|
dump_packet(packet);
|
|
break;
|
|
}
|
|
|
|
packet += len_packet(packet);
|
|
|
|
if (*hangup || *handshake) {
|
|
pr_debug("%s: hangup or handshake\n", __FUNCTION__);
|
|
/*
|
|
* we need to send the hangup now before receiving any more data.
|
|
* If we get "data, hangup, data", we can't deliver the second
|
|
* data before the hangup.
|
|
*/
|
|
break;
|
|
}
|
|
}
|
|
|
|
compact_inbuf(hp, packet);
|
|
|
|
return 1;
|
|
}
|
|
|
|
static void hvsi_send_overflow(struct hvsi_struct *hp)
|
|
{
|
|
pr_debug("%s: delivering %i bytes overflow\n", __FUNCTION__,
|
|
hp->n_throttle);
|
|
|
|
hvsi_insert_chars(hp, hp->throttle_buf, hp->n_throttle);
|
|
hp->n_throttle = 0;
|
|
}
|
|
|
|
/*
|
|
* must get all pending data because we only get an irq on empty->non-empty
|
|
* transition
|
|
*/
|
|
static irqreturn_t hvsi_interrupt(int irq, void *arg, struct pt_regs *regs)
|
|
{
|
|
struct hvsi_struct *hp = (struct hvsi_struct *)arg;
|
|
struct tty_struct *flip;
|
|
struct tty_struct *hangup;
|
|
struct hvsi_struct *handshake;
|
|
unsigned long flags;
|
|
int again = 1;
|
|
|
|
pr_debug("%s\n", __FUNCTION__);
|
|
|
|
while (again) {
|
|
spin_lock_irqsave(&hp->lock, flags);
|
|
again = hvsi_load_chunk(hp, &flip, &hangup, &handshake);
|
|
spin_unlock_irqrestore(&hp->lock, flags);
|
|
|
|
/*
|
|
* we have to call tty_flip_buffer_push() and tty_hangup() outside our
|
|
* spinlock. But we also have to keep going until we've read all the
|
|
* available data.
|
|
*/
|
|
|
|
if (flip) {
|
|
/* there was data put in the tty flip buffer */
|
|
tty_flip_buffer_push(flip);
|
|
flip = NULL;
|
|
}
|
|
|
|
if (hangup) {
|
|
tty_hangup(hangup);
|
|
}
|
|
|
|
if (handshake) {
|
|
pr_debug("hvsi%i: attempting re-handshake\n", handshake->index);
|
|
schedule_work(&handshake->handshaker);
|
|
}
|
|
}
|
|
|
|
spin_lock_irqsave(&hp->lock, flags);
|
|
if (hp->tty && hp->n_throttle
|
|
&& (!test_bit(TTY_THROTTLED, &hp->tty->flags))) {
|
|
/* we weren't hung up and we weren't throttled, so we can deliver the
|
|
* rest now */
|
|
flip = hp->tty;
|
|
hvsi_send_overflow(hp);
|
|
}
|
|
spin_unlock_irqrestore(&hp->lock, flags);
|
|
|
|
if (flip) {
|
|
tty_flip_buffer_push(flip);
|
|
}
|
|
|
|
return IRQ_HANDLED;
|
|
}
|
|
|
|
/* for boot console, before the irq handler is running */
|
|
static int __init poll_for_state(struct hvsi_struct *hp, int state)
|
|
{
|
|
unsigned long end_jiffies = jiffies + HVSI_TIMEOUT;
|
|
|
|
for (;;) {
|
|
hvsi_interrupt(hp->virq, (void *)hp, NULL); /* get pending data */
|
|
|
|
if (hp->state == state)
|
|
return 0;
|
|
|
|
mdelay(5);
|
|
if (time_after(jiffies, end_jiffies))
|
|
return -EIO;
|
|
}
|
|
}
|
|
|
|
/* wait for irq handler to change our state */
|
|
static int wait_for_state(struct hvsi_struct *hp, int state)
|
|
{
|
|
int ret = 0;
|
|
|
|
if (!wait_event_timeout(hp->stateq, (hp->state == state), HVSI_TIMEOUT))
|
|
ret = -EIO;
|
|
|
|
return ret;
|
|
}
|
|
|
|
static int hvsi_query(struct hvsi_struct *hp, uint16_t verb)
|
|
{
|
|
struct hvsi_query packet __ALIGNED__;
|
|
int wrote;
|
|
|
|
packet.type = VS_QUERY_PACKET_HEADER;
|
|
packet.len = sizeof(struct hvsi_query);
|
|
packet.seqno = atomic_inc_return(&hp->seqno);
|
|
packet.verb = verb;
|
|
|
|
pr_debug("%s: sending %i bytes\n", __FUNCTION__, packet.len);
|
|
dbg_dump_hex((uint8_t*)&packet, packet.len);
|
|
|
|
wrote = hvc_put_chars(hp->vtermno, (char *)&packet, packet.len);
|
|
if (wrote != packet.len) {
|
|
printk(KERN_ERR "hvsi%i: couldn't send query (%i)!\n", hp->index,
|
|
wrote);
|
|
return -EIO;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int hvsi_get_mctrl(struct hvsi_struct *hp)
|
|
{
|
|
int ret;
|
|
|
|
set_state(hp, HVSI_WAIT_FOR_MCTRL_RESPONSE);
|
|
hvsi_query(hp, VSV_SEND_MODEM_CTL_STATUS);
|
|
|
|
ret = hvsi_wait(hp, HVSI_OPEN);
|
|
if (ret < 0) {
|
|
printk(KERN_ERR "hvsi%i: didn't get modem flags\n", hp->index);
|
|
set_state(hp, HVSI_OPEN);
|
|
return ret;
|
|
}
|
|
|
|
pr_debug("%s: mctrl 0x%x\n", __FUNCTION__, hp->mctrl);
|
|
|
|
return 0;
|
|
}
|
|
|
|
/* note that we can only set DTR */
|
|
static int hvsi_set_mctrl(struct hvsi_struct *hp, uint16_t mctrl)
|
|
{
|
|
struct hvsi_control packet __ALIGNED__;
|
|
int wrote;
|
|
|
|
packet.type = VS_CONTROL_PACKET_HEADER,
|
|
packet.seqno = atomic_inc_return(&hp->seqno);
|
|
packet.len = sizeof(struct hvsi_control);
|
|
packet.verb = VSV_SET_MODEM_CTL;
|
|
packet.mask = HVSI_TSDTR;
|
|
|
|
if (mctrl & TIOCM_DTR)
|
|
packet.word = HVSI_TSDTR;
|
|
|
|
pr_debug("%s: sending %i bytes\n", __FUNCTION__, packet.len);
|
|
dbg_dump_hex((uint8_t*)&packet, packet.len);
|
|
|
|
wrote = hvc_put_chars(hp->vtermno, (char *)&packet, packet.len);
|
|
if (wrote != packet.len) {
|
|
printk(KERN_ERR "hvsi%i: couldn't set DTR!\n", hp->index);
|
|
return -EIO;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static void hvsi_drain_input(struct hvsi_struct *hp)
|
|
{
|
|
uint8_t buf[HVSI_MAX_READ] __ALIGNED__;
|
|
unsigned long end_jiffies = jiffies + HVSI_TIMEOUT;
|
|
|
|
while (time_before(end_jiffies, jiffies))
|
|
if (0 == hvsi_read(hp, buf, HVSI_MAX_READ))
|
|
break;
|
|
}
|
|
|
|
static int hvsi_handshake(struct hvsi_struct *hp)
|
|
{
|
|
int ret;
|
|
|
|
/*
|
|
* We could have a CLOSE or other data waiting for us before we even try
|
|
* to open; try to throw it all away so we don't get confused. (CLOSE
|
|
* is the first message sent up the pipe when the FSP comes online. We
|
|
* need to distinguish between "it came up a while ago and we're the first
|
|
* user" and "it was just reset before it saw our handshake packet".)
|
|
*/
|
|
hvsi_drain_input(hp);
|
|
|
|
set_state(hp, HVSI_WAIT_FOR_VER_RESPONSE);
|
|
ret = hvsi_query(hp, VSV_SEND_VERSION_NUMBER);
|
|
if (ret < 0) {
|
|
printk(KERN_ERR "hvsi%i: couldn't send version query\n", hp->index);
|
|
return ret;
|
|
}
|
|
|
|
ret = hvsi_wait(hp, HVSI_OPEN);
|
|
if (ret < 0)
|
|
return ret;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static void hvsi_handshaker(void *arg)
|
|
{
|
|
struct hvsi_struct *hp = (struct hvsi_struct *)arg;
|
|
|
|
if (hvsi_handshake(hp) >= 0)
|
|
return;
|
|
|
|
printk(KERN_ERR "hvsi%i: re-handshaking failed\n", hp->index);
|
|
if (is_console(hp)) {
|
|
/*
|
|
* ttys will re-attempt the handshake via hvsi_open, but
|
|
* the console will not.
|
|
*/
|
|
printk(KERN_ERR "hvsi%i: lost console!\n", hp->index);
|
|
}
|
|
}
|
|
|
|
static int hvsi_put_chars(struct hvsi_struct *hp, const char *buf, int count)
|
|
{
|
|
struct hvsi_data packet __ALIGNED__;
|
|
int ret;
|
|
|
|
BUG_ON(count > HVSI_MAX_OUTGOING_DATA);
|
|
|
|
packet.type = VS_DATA_PACKET_HEADER;
|
|
packet.seqno = atomic_inc_return(&hp->seqno);
|
|
packet.len = count + sizeof(struct hvsi_header);
|
|
memcpy(&packet.data, buf, count);
|
|
|
|
ret = hvc_put_chars(hp->vtermno, (char *)&packet, packet.len);
|
|
if (ret == packet.len) {
|
|
/* return the number of chars written, not the packet length */
|
|
return count;
|
|
}
|
|
return ret; /* return any errors */
|
|
}
|
|
|
|
static void hvsi_close_protocol(struct hvsi_struct *hp)
|
|
{
|
|
struct hvsi_control packet __ALIGNED__;
|
|
|
|
packet.type = VS_CONTROL_PACKET_HEADER;
|
|
packet.seqno = atomic_inc_return(&hp->seqno);
|
|
packet.len = 6;
|
|
packet.verb = VSV_CLOSE_PROTOCOL;
|
|
|
|
pr_debug("%s: sending %i bytes\n", __FUNCTION__, packet.len);
|
|
dbg_dump_hex((uint8_t*)&packet, packet.len);
|
|
|
|
hvc_put_chars(hp->vtermno, (char *)&packet, packet.len);
|
|
}
|
|
|
|
static int hvsi_open(struct tty_struct *tty, struct file *filp)
|
|
{
|
|
struct hvsi_struct *hp;
|
|
unsigned long flags;
|
|
int line = tty->index;
|
|
int ret;
|
|
|
|
pr_debug("%s\n", __FUNCTION__);
|
|
|
|
if (line < 0 || line >= hvsi_count)
|
|
return -ENODEV;
|
|
hp = &hvsi_ports[line];
|
|
|
|
tty->driver_data = hp;
|
|
tty->low_latency = 1; /* avoid throttle/tty_flip_buffer_push race */
|
|
|
|
mb();
|
|
if (hp->state == HVSI_FSP_DIED)
|
|
return -EIO;
|
|
|
|
spin_lock_irqsave(&hp->lock, flags);
|
|
hp->tty = tty;
|
|
hp->count++;
|
|
atomic_set(&hp->seqno, 0);
|
|
h_vio_signal(hp->vtermno, VIO_IRQ_ENABLE);
|
|
spin_unlock_irqrestore(&hp->lock, flags);
|
|
|
|
if (is_console(hp))
|
|
return 0; /* this has already been handshaked as the console */
|
|
|
|
ret = hvsi_handshake(hp);
|
|
if (ret < 0) {
|
|
printk(KERN_ERR "%s: HVSI handshaking failed\n", tty->name);
|
|
return ret;
|
|
}
|
|
|
|
ret = hvsi_get_mctrl(hp);
|
|
if (ret < 0) {
|
|
printk(KERN_ERR "%s: couldn't get initial modem flags\n", tty->name);
|
|
return ret;
|
|
}
|
|
|
|
ret = hvsi_set_mctrl(hp, hp->mctrl | TIOCM_DTR);
|
|
if (ret < 0) {
|
|
printk(KERN_ERR "%s: couldn't set DTR\n", tty->name);
|
|
return ret;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
/* wait for hvsi_write_worker to empty hp->outbuf */
|
|
static void hvsi_flush_output(struct hvsi_struct *hp)
|
|
{
|
|
wait_event_timeout(hp->emptyq, (hp->n_outbuf <= 0), HVSI_TIMEOUT);
|
|
|
|
/* 'writer' could still be pending if it didn't see n_outbuf = 0 yet */
|
|
cancel_delayed_work(&hp->writer);
|
|
flush_scheduled_work();
|
|
|
|
/*
|
|
* it's also possible that our timeout expired and hvsi_write_worker
|
|
* didn't manage to push outbuf. poof.
|
|
*/
|
|
hp->n_outbuf = 0;
|
|
}
|
|
|
|
static void hvsi_close(struct tty_struct *tty, struct file *filp)
|
|
{
|
|
struct hvsi_struct *hp = tty->driver_data;
|
|
unsigned long flags;
|
|
|
|
pr_debug("%s\n", __FUNCTION__);
|
|
|
|
if (tty_hung_up_p(filp))
|
|
return;
|
|
|
|
spin_lock_irqsave(&hp->lock, flags);
|
|
|
|
if (--hp->count == 0) {
|
|
hp->tty = NULL;
|
|
hp->inbuf_end = hp->inbuf; /* discard remaining partial packets */
|
|
|
|
/* only close down connection if it is not the console */
|
|
if (!is_console(hp)) {
|
|
h_vio_signal(hp->vtermno, VIO_IRQ_DISABLE); /* no more irqs */
|
|
__set_state(hp, HVSI_CLOSED);
|
|
/*
|
|
* any data delivered to the tty layer after this will be
|
|
* discarded (except for XON/XOFF)
|
|
*/
|
|
tty->closing = 1;
|
|
|
|
spin_unlock_irqrestore(&hp->lock, flags);
|
|
|
|
/* let any existing irq handlers finish. no more will start. */
|
|
synchronize_irq(hp->virq);
|
|
|
|
/* hvsi_write_worker will re-schedule until outbuf is empty. */
|
|
hvsi_flush_output(hp);
|
|
|
|
/* tell FSP to stop sending data */
|
|
hvsi_close_protocol(hp);
|
|
|
|
/*
|
|
* drain anything FSP is still in the middle of sending, and let
|
|
* hvsi_handshake drain the rest on the next open.
|
|
*/
|
|
hvsi_drain_input(hp);
|
|
|
|
spin_lock_irqsave(&hp->lock, flags);
|
|
}
|
|
} else if (hp->count < 0)
|
|
printk(KERN_ERR "hvsi_close %lu: oops, count is %d\n",
|
|
hp - hvsi_ports, hp->count);
|
|
|
|
spin_unlock_irqrestore(&hp->lock, flags);
|
|
}
|
|
|
|
static void hvsi_hangup(struct tty_struct *tty)
|
|
{
|
|
struct hvsi_struct *hp = tty->driver_data;
|
|
unsigned long flags;
|
|
|
|
pr_debug("%s\n", __FUNCTION__);
|
|
|
|
spin_lock_irqsave(&hp->lock, flags);
|
|
|
|
hp->count = 0;
|
|
hp->n_outbuf = 0;
|
|
hp->tty = NULL;
|
|
|
|
spin_unlock_irqrestore(&hp->lock, flags);
|
|
}
|
|
|
|
/* called with hp->lock held */
|
|
static void hvsi_push(struct hvsi_struct *hp)
|
|
{
|
|
int n;
|
|
|
|
if (hp->n_outbuf <= 0)
|
|
return;
|
|
|
|
n = hvsi_put_chars(hp, hp->outbuf, hp->n_outbuf);
|
|
if (n > 0) {
|
|
/* success */
|
|
pr_debug("%s: wrote %i chars\n", __FUNCTION__, n);
|
|
hp->n_outbuf = 0;
|
|
} else if (n == -EIO) {
|
|
__set_state(hp, HVSI_FSP_DIED);
|
|
printk(KERN_ERR "hvsi%i: service processor died\n", hp->index);
|
|
}
|
|
}
|
|
|
|
/* hvsi_write_worker will keep rescheduling itself until outbuf is empty */
|
|
static void hvsi_write_worker(void *arg)
|
|
{
|
|
struct hvsi_struct *hp = (struct hvsi_struct *)arg;
|
|
unsigned long flags;
|
|
#ifdef DEBUG
|
|
static long start_j = 0;
|
|
|
|
if (start_j == 0)
|
|
start_j = jiffies;
|
|
#endif /* DEBUG */
|
|
|
|
spin_lock_irqsave(&hp->lock, flags);
|
|
|
|
pr_debug("%s: %i chars in buffer\n", __FUNCTION__, hp->n_outbuf);
|
|
|
|
if (!is_open(hp)) {
|
|
/*
|
|
* We could have a non-open connection if the service processor died
|
|
* while we were busily scheduling ourselves. In that case, it could
|
|
* be minutes before the service processor comes back, so only try
|
|
* again once a second.
|
|
*/
|
|
schedule_delayed_work(&hp->writer, HZ);
|
|
goto out;
|
|
}
|
|
|
|
hvsi_push(hp);
|
|
if (hp->n_outbuf > 0)
|
|
schedule_delayed_work(&hp->writer, 10);
|
|
else {
|
|
#ifdef DEBUG
|
|
pr_debug("%s: outbuf emptied after %li jiffies\n", __FUNCTION__,
|
|
jiffies - start_j);
|
|
start_j = 0;
|
|
#endif /* DEBUG */
|
|
wake_up_all(&hp->emptyq);
|
|
if (test_bit(TTY_DO_WRITE_WAKEUP, &hp->tty->flags)
|
|
&& hp->tty->ldisc.write_wakeup)
|
|
hp->tty->ldisc.write_wakeup(hp->tty);
|
|
wake_up_interruptible(&hp->tty->write_wait);
|
|
}
|
|
|
|
out:
|
|
spin_unlock_irqrestore(&hp->lock, flags);
|
|
}
|
|
|
|
static int hvsi_write_room(struct tty_struct *tty)
|
|
{
|
|
struct hvsi_struct *hp = (struct hvsi_struct *)tty->driver_data;
|
|
|
|
return N_OUTBUF - hp->n_outbuf;
|
|
}
|
|
|
|
static int hvsi_chars_in_buffer(struct tty_struct *tty)
|
|
{
|
|
struct hvsi_struct *hp = (struct hvsi_struct *)tty->driver_data;
|
|
|
|
return hp->n_outbuf;
|
|
}
|
|
|
|
static int hvsi_write(struct tty_struct *tty,
|
|
const unsigned char *buf, int count)
|
|
{
|
|
struct hvsi_struct *hp = tty->driver_data;
|
|
const char *source = buf;
|
|
unsigned long flags;
|
|
int total = 0;
|
|
int origcount = count;
|
|
|
|
spin_lock_irqsave(&hp->lock, flags);
|
|
|
|
pr_debug("%s: %i chars in buffer\n", __FUNCTION__, hp->n_outbuf);
|
|
|
|
if (!is_open(hp)) {
|
|
/* we're either closing or not yet open; don't accept data */
|
|
pr_debug("%s: not open\n", __FUNCTION__);
|
|
goto out;
|
|
}
|
|
|
|
/*
|
|
* when the hypervisor buffer (16K) fills, data will stay in hp->outbuf
|
|
* and hvsi_write_worker will be scheduled. subsequent hvsi_write() calls
|
|
* will see there is no room in outbuf and return.
|
|
*/
|
|
while ((count > 0) && (hvsi_write_room(hp->tty) > 0)) {
|
|
int chunksize = min(count, hvsi_write_room(hp->tty));
|
|
|
|
BUG_ON(hp->n_outbuf < 0);
|
|
memcpy(hp->outbuf + hp->n_outbuf, source, chunksize);
|
|
hp->n_outbuf += chunksize;
|
|
|
|
total += chunksize;
|
|
source += chunksize;
|
|
count -= chunksize;
|
|
hvsi_push(hp);
|
|
}
|
|
|
|
if (hp->n_outbuf > 0) {
|
|
/*
|
|
* we weren't able to write it all to the hypervisor.
|
|
* schedule another push attempt.
|
|
*/
|
|
schedule_delayed_work(&hp->writer, 10);
|
|
}
|
|
|
|
out:
|
|
spin_unlock_irqrestore(&hp->lock, flags);
|
|
|
|
if (total != origcount)
|
|
pr_debug("%s: wanted %i, only wrote %i\n", __FUNCTION__, origcount,
|
|
total);
|
|
|
|
return total;
|
|
}
|
|
|
|
/*
|
|
* I have never seen throttle or unthrottle called, so this little throttle
|
|
* buffering scheme may or may not work.
|
|
*/
|
|
static void hvsi_throttle(struct tty_struct *tty)
|
|
{
|
|
struct hvsi_struct *hp = (struct hvsi_struct *)tty->driver_data;
|
|
|
|
pr_debug("%s\n", __FUNCTION__);
|
|
|
|
h_vio_signal(hp->vtermno, VIO_IRQ_DISABLE);
|
|
}
|
|
|
|
static void hvsi_unthrottle(struct tty_struct *tty)
|
|
{
|
|
struct hvsi_struct *hp = (struct hvsi_struct *)tty->driver_data;
|
|
unsigned long flags;
|
|
int shouldflip = 0;
|
|
|
|
pr_debug("%s\n", __FUNCTION__);
|
|
|
|
spin_lock_irqsave(&hp->lock, flags);
|
|
if (hp->n_throttle) {
|
|
hvsi_send_overflow(hp);
|
|
shouldflip = 1;
|
|
}
|
|
spin_unlock_irqrestore(&hp->lock, flags);
|
|
|
|
if (shouldflip)
|
|
tty_flip_buffer_push(hp->tty);
|
|
|
|
h_vio_signal(hp->vtermno, VIO_IRQ_ENABLE);
|
|
}
|
|
|
|
static int hvsi_tiocmget(struct tty_struct *tty, struct file *file)
|
|
{
|
|
struct hvsi_struct *hp = (struct hvsi_struct *)tty->driver_data;
|
|
|
|
hvsi_get_mctrl(hp);
|
|
return hp->mctrl;
|
|
}
|
|
|
|
static int hvsi_tiocmset(struct tty_struct *tty, struct file *file,
|
|
unsigned int set, unsigned int clear)
|
|
{
|
|
struct hvsi_struct *hp = (struct hvsi_struct *)tty->driver_data;
|
|
unsigned long flags;
|
|
uint16_t new_mctrl;
|
|
|
|
/* we can only alter DTR */
|
|
clear &= TIOCM_DTR;
|
|
set &= TIOCM_DTR;
|
|
|
|
spin_lock_irqsave(&hp->lock, flags);
|
|
|
|
new_mctrl = (hp->mctrl & ~clear) | set;
|
|
|
|
if (hp->mctrl != new_mctrl) {
|
|
hvsi_set_mctrl(hp, new_mctrl);
|
|
hp->mctrl = new_mctrl;
|
|
}
|
|
spin_unlock_irqrestore(&hp->lock, flags);
|
|
|
|
return 0;
|
|
}
|
|
|
|
|
|
static struct tty_operations hvsi_ops = {
|
|
.open = hvsi_open,
|
|
.close = hvsi_close,
|
|
.write = hvsi_write,
|
|
.hangup = hvsi_hangup,
|
|
.write_room = hvsi_write_room,
|
|
.chars_in_buffer = hvsi_chars_in_buffer,
|
|
.throttle = hvsi_throttle,
|
|
.unthrottle = hvsi_unthrottle,
|
|
.tiocmget = hvsi_tiocmget,
|
|
.tiocmset = hvsi_tiocmset,
|
|
};
|
|
|
|
static int __init hvsi_init(void)
|
|
{
|
|
int i;
|
|
|
|
hvsi_driver = alloc_tty_driver(hvsi_count);
|
|
if (!hvsi_driver)
|
|
return -ENOMEM;
|
|
|
|
hvsi_driver->owner = THIS_MODULE;
|
|
hvsi_driver->devfs_name = "hvsi/";
|
|
hvsi_driver->driver_name = "hvsi";
|
|
hvsi_driver->name = "hvsi";
|
|
hvsi_driver->major = HVSI_MAJOR;
|
|
hvsi_driver->minor_start = HVSI_MINOR;
|
|
hvsi_driver->type = TTY_DRIVER_TYPE_SYSTEM;
|
|
hvsi_driver->init_termios = tty_std_termios;
|
|
hvsi_driver->init_termios.c_cflag = B9600 | CS8 | CREAD | HUPCL;
|
|
hvsi_driver->flags = TTY_DRIVER_REAL_RAW;
|
|
tty_set_operations(hvsi_driver, &hvsi_ops);
|
|
|
|
for (i=0; i < hvsi_count; i++) {
|
|
struct hvsi_struct *hp = &hvsi_ports[i];
|
|
int ret = 1;
|
|
|
|
ret = request_irq(hp->virq, hvsi_interrupt, SA_INTERRUPT, "hvsi", hp);
|
|
if (ret)
|
|
printk(KERN_ERR "HVSI: couldn't reserve irq 0x%x (error %i)\n",
|
|
hp->virq, ret);
|
|
}
|
|
hvsi_wait = wait_for_state; /* irqs active now */
|
|
|
|
if (tty_register_driver(hvsi_driver))
|
|
panic("Couldn't register hvsi console driver\n");
|
|
|
|
printk(KERN_INFO "HVSI: registered %i devices\n", hvsi_count);
|
|
|
|
return 0;
|
|
}
|
|
device_initcall(hvsi_init);
|
|
|
|
/***** console (not tty) code: *****/
|
|
|
|
static void hvsi_console_print(struct console *console, const char *buf,
|
|
unsigned int count)
|
|
{
|
|
struct hvsi_struct *hp = &hvsi_ports[console->index];
|
|
char c[HVSI_MAX_OUTGOING_DATA] __ALIGNED__;
|
|
unsigned int i = 0, n = 0;
|
|
int ret, donecr = 0;
|
|
|
|
mb();
|
|
if (!is_open(hp))
|
|
return;
|
|
|
|
/*
|
|
* ugh, we have to translate LF -> CRLF ourselves, in place.
|
|
* copied from hvc_console.c:
|
|
*/
|
|
while (count > 0 || i > 0) {
|
|
if (count > 0 && i < sizeof(c)) {
|
|
if (buf[n] == '\n' && !donecr) {
|
|
c[i++] = '\r';
|
|
donecr = 1;
|
|
} else {
|
|
c[i++] = buf[n++];
|
|
donecr = 0;
|
|
--count;
|
|
}
|
|
} else {
|
|
ret = hvsi_put_chars(hp, c, i);
|
|
if (ret < 0)
|
|
i = 0;
|
|
i -= ret;
|
|
}
|
|
}
|
|
}
|
|
|
|
static struct tty_driver *hvsi_console_device(struct console *console,
|
|
int *index)
|
|
{
|
|
*index = console->index;
|
|
return hvsi_driver;
|
|
}
|
|
|
|
static int __init hvsi_console_setup(struct console *console, char *options)
|
|
{
|
|
struct hvsi_struct *hp = &hvsi_ports[console->index];
|
|
int ret;
|
|
|
|
if (console->index < 0 || console->index >= hvsi_count)
|
|
return -1;
|
|
|
|
/* give the FSP a chance to change the baud rate when we re-open */
|
|
hvsi_close_protocol(hp);
|
|
|
|
ret = hvsi_handshake(hp);
|
|
if (ret < 0)
|
|
return ret;
|
|
|
|
ret = hvsi_get_mctrl(hp);
|
|
if (ret < 0)
|
|
return ret;
|
|
|
|
ret = hvsi_set_mctrl(hp, hp->mctrl | TIOCM_DTR);
|
|
if (ret < 0)
|
|
return ret;
|
|
|
|
hp->flags |= HVSI_CONSOLE;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static struct console hvsi_con_driver = {
|
|
.name = "hvsi",
|
|
.write = hvsi_console_print,
|
|
.device = hvsi_console_device,
|
|
.setup = hvsi_console_setup,
|
|
.flags = CON_PRINTBUFFER,
|
|
.index = -1,
|
|
};
|
|
|
|
static int __init hvsi_console_init(void)
|
|
{
|
|
struct device_node *vty;
|
|
|
|
hvsi_wait = poll_for_state; /* no irqs yet; must poll */
|
|
|
|
/* search device tree for vty nodes */
|
|
for (vty = of_find_compatible_node(NULL, "serial", "hvterm-protocol");
|
|
vty != NULL;
|
|
vty = of_find_compatible_node(vty, "serial", "hvterm-protocol")) {
|
|
struct hvsi_struct *hp;
|
|
uint32_t *vtermno;
|
|
uint32_t *irq;
|
|
|
|
vtermno = (uint32_t *)get_property(vty, "reg", NULL);
|
|
irq = (uint32_t *)get_property(vty, "interrupts", NULL);
|
|
if (!vtermno || !irq)
|
|
continue;
|
|
|
|
if (hvsi_count >= MAX_NR_HVSI_CONSOLES) {
|
|
of_node_put(vty);
|
|
break;
|
|
}
|
|
|
|
hp = &hvsi_ports[hvsi_count];
|
|
INIT_WORK(&hp->writer, hvsi_write_worker, hp);
|
|
INIT_WORK(&hp->handshaker, hvsi_handshaker, hp);
|
|
init_waitqueue_head(&hp->emptyq);
|
|
init_waitqueue_head(&hp->stateq);
|
|
spin_lock_init(&hp->lock);
|
|
hp->index = hvsi_count;
|
|
hp->inbuf_end = hp->inbuf;
|
|
hp->state = HVSI_CLOSED;
|
|
hp->vtermno = *vtermno;
|
|
hp->virq = virt_irq_create_mapping(irq[0]);
|
|
if (hp->virq == NO_IRQ) {
|
|
printk(KERN_ERR "%s: couldn't create irq mapping for 0x%x\n",
|
|
__FUNCTION__, hp->virq);
|
|
continue;
|
|
} else
|
|
hp->virq = irq_offset_up(hp->virq);
|
|
|
|
hvsi_count++;
|
|
}
|
|
|
|
if (hvsi_count)
|
|
register_console(&hvsi_con_driver);
|
|
return 0;
|
|
}
|
|
console_initcall(hvsi_console_init);
|
|
|