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|
/*
* iSeries vio driver interface to hvc_console.c
*
* This code is based heavily on hvc_vio.c and viocons.c
*
* Copyright (C) 2006 Stephen Rothwell, IBM Corporation
*
* 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
*/
#include <stdarg.h>
#include <linux/types.h>
#include <linux/init.h>
#include <linux/kernel.h>
#include <linux/spinlock.h>
#include <linux/console.h>
#include <asm/hvconsole.h>
#include <asm/vio.h>
#include <asm/prom.h>
#include <asm/firmware.h>
#include <asm/iseries/vio.h>
#include <asm/iseries/hv_call.h>
#include <asm/iseries/hv_lp_config.h>
#include <asm/iseries/hv_lp_event.h>
#include "hvc_console.h"
#define VTTY_PORTS 10
static DEFINE_SPINLOCK(consolelock);
static DEFINE_SPINLOCK(consoleloglock);
static const char hvc_driver_name[] = "hvc_console";
#define IN_BUF_SIZE 200
/*
* Our port information.
*/
static struct port_info {
HvLpIndex lp;
u64 seq; /* sequence number of last HV send */
u64 ack; /* last ack from HV */
struct hvc_struct *hp;
int in_start;
int in_end;
unsigned char in_buf[IN_BUF_SIZE];
} port_info[VTTY_PORTS] = {
[ 0 ... VTTY_PORTS - 1 ] = {
.lp = HvLpIndexInvalid
}
};
#define viochar_is_console(pi) ((pi) == &port_info[0])
static struct vio_device_id hvc_driver_table[] __devinitdata = {
{"serial", "IBM,iSeries-vty"},
{ "", "" }
};
MODULE_DEVICE_TABLE(vio, hvc_driver_table);
static void hvlog(char *fmt, ...)
{
int i;
unsigned long flags;
va_list args;
static char buf[256];
spin_lock_irqsave(&consoleloglock, flags);
va_start(args, fmt);
i = vscnprintf(buf, sizeof(buf) - 1, fmt, args);
va_end(args);
buf[i++] = '\r';
HvCall_writeLogBuffer(buf, i);
spin_unlock_irqrestore(&consoleloglock, flags);
}
/*
* Initialize the common fields in a charLpEvent
*/
static void init_data_event(struct viocharlpevent *viochar, HvLpIndex lp)
{
struct HvLpEvent *hev = &viochar->event;
memset(viochar, 0, sizeof(struct viocharlpevent));
hev->flags = HV_LP_EVENT_VALID | HV_LP_EVENT_DEFERRED_ACK |
HV_LP_EVENT_INT;
hev->xType = HvLpEvent_Type_VirtualIo;
hev->xSubtype = viomajorsubtype_chario | viochardata;
hev->xSourceLp = HvLpConfig_getLpIndex();
hev->xTargetLp = lp;
hev->xSizeMinus1 = sizeof(struct viocharlpevent);
hev->xSourceInstanceId = viopath_sourceinst(lp);
hev->xTargetInstanceId = viopath_targetinst(lp);
}
static int get_chars(uint32_t vtermno, char *buf, int count)
{
struct port_info *pi;
int n = 0;
unsigned long flags;
if (vtermno >= VTTY_PORTS)
return -EINVAL;
if (count == 0)
return 0;
pi = &port_info[vtermno];
spin_lock_irqsave(&consolelock, flags);
if (pi->in_end == 0)
goto done;
n = pi->in_end - pi->in_start;
if (n > count)
n = count;
memcpy(buf, &pi->in_buf[pi->in_start], n);
pi->in_start += n;
if (pi->in_start == pi->in_end) {
pi->in_start = 0;
pi->in_end = 0;
}
done:
spin_unlock_irqrestore(&consolelock, flags);
return n;
}
static int put_chars(uint32_t vtermno, const char *buf, int count)
{
struct viocharlpevent *viochar;
struct port_info *pi;
HvLpEvent_Rc hvrc;
unsigned long flags;
int sent = 0;
if (vtermno >= VTTY_PORTS)
return -EINVAL;
pi = &port_info[vtermno];
spin_lock_irqsave(&consolelock, flags);
if (viochar_is_console(pi) && !viopath_isactive(pi->lp)) {
HvCall_writeLogBuffer(buf, count);
sent = count;
goto done;
}
viochar = vio_get_event_buffer(viomajorsubtype_chario);
if (viochar == NULL) {
hvlog("\n\rviocons: Can't get viochar buffer.");
goto done;
}
while ((count > 0) && ((pi->seq - pi->ack) < VIOCHAR_WINDOW)) {
int len;
len = (count > VIOCHAR_MAX_DATA) ? VIOCHAR_MAX_DATA : count;
if (viochar_is_console(pi))
HvCall_writeLogBuffer(buf, len);
init_data_event(viochar, pi->lp);
viochar->len = len;
viochar->event.xCorrelationToken = pi->seq++;
viochar->event.xSizeMinus1 =
offsetof(struct viocharlpevent, data) + len;
memcpy(viochar->data, buf, len);
hvrc = HvCallEvent_signalLpEvent(&viochar->event);
if (hvrc)
hvlog("\n\rerror sending event! return code %d\n\r",
(int)hvrc);
sent += len;
count -= len;
buf += len;
}
vio_free_event_buffer(viomajorsubtype_chario, viochar);
done:
spin_unlock_irqrestore(&consolelock, flags);
return sent;
}
static struct hv_ops hvc_get_put_ops = {
.get_chars = get_chars,
.put_chars = put_chars,
};
static int __devinit hvc_vio_probe(struct vio_dev *vdev,
const struct vio_device_id *id)
{
struct hvc_struct *hp;
struct port_info *pi;
/* probed with invalid parameters. */
if (!vdev || !id)
return -EPERM;
if (vdev->unit_address >= VTTY_PORTS)
return -ENODEV;
pi = &port_info[vdev->unit_address];
hp = hvc_alloc(vdev->unit_address, vdev->irq, &hvc_get_put_ops,
VIOCHAR_MAX_DATA);
if (IS_ERR(hp))
return PTR_ERR(hp);
pi->hp = hp;
dev_set_drvdata(&vdev->dev, pi);
return 0;
}
static int __devexit hvc_vio_remove(struct vio_dev *vdev)
{
struct port_info *pi = dev_get_drvdata(&vdev->
|