/*
* HIL MLC state machine and serio interface driver
*
* Copyright (c) 2001 Brian S. Julin
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions, and the following disclaimer,
* without modification.
* 2. The name of the author may not be used to endorse or promote products
* derived from this software without specific prior written permission.
*
* Alternatively, this software may be distributed under the terms of the
* GNU General Public License ("GPL").
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE FOR
* ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
*
* References:
* HP-HIL Technical Reference Manual. Hewlett Packard Product No. 45918A
*
*
* Driver theory of operation:
*
* Some access methods and an ISR is defined by the sub-driver
* (e.g. hp_sdc_mlc.c). These methods are expected to provide a
* few bits of logic in addition to raw access to the HIL MLC,
* specifically, the ISR, which is entirely registered by the
* sub-driver and invoked directly, must check for record
* termination or packet match, at which point a semaphore must
* be cleared and then the hil_mlcs_tasklet must be scheduled.
*
* The hil_mlcs_tasklet processes the state machine for all MLCs
* each time it runs, checking each MLC's progress at the current
* node in the state machine, and moving the MLC to subsequent nodes
* in the state machine when appropriate. It will reschedule
* itself if output is pending. (This rescheduling should be replaced
* at some point with a sub-driver-specific mechanism.)
*
* A timer task prods the tasklet once per second to prevent
* hangups when attached devices do not return expected data
* and to initiate probes of the loop for new devices.
*/
#include <linux/hil_mlc.h>
#include <linux/errno.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/init.h>
#include <linux/interrupt.h>
#include <linux/slab.h>
#include <linux/timer.h>
#include <linux/list.h>
MODULE_AUTHOR("Brian S. Julin <[email protected]>");
MODULE_DESCRIPTION("HIL MLC serio");
MODULE_LICENSE("Dual BSD/GPL");
EXPORT_SYMBOL(hil_mlc_register);
EXPORT_SYMBOL(hil_mlc_unregister);
#define PREFIX "HIL MLC: "
static LIST_HEAD(hil_mlcs);
static DEFINE_RWLOCK(hil_mlcs_lock);
static struct timer_list hil_mlcs_kicker;
static int hil_mlcs_probe, hil_mlc_stop;
static void hil_mlcs_process(unsigned long unused);
static DECLARE_TASKLET_DISABLED_OLD(hil_mlcs_tasklet, hil_mlcs_process);
/* #define HIL_MLC_DEBUG */
/********************** Device info/instance management **********************/
static void hil_mlc_clear_di_map(hil_mlc *mlc, int val)
{
int j;
for (j = val; j < 7 ; j++)
mlc->di_map[j] = -1;
}
static void hil_mlc_clear_di_scratch(hil_mlc *mlc)
{
memset(&mlc->di_scratch, 0, sizeof(mlc->di_scratch));
}
static void hil_mlc_copy_di_scratch(hil_mlc *mlc, int idx)
{
memcpy(&mlc->di[idx], &mlc->di_scratch, sizeof(mlc->di_scratch));
}
static int hil_mlc_match_di_scratch(hil_mlc *mlc)
{
int idx;
for (idx = 0; idx < HIL_MLC_DEVMEM; idx++) {
int j, found = 0;
/* In-use slots are not eligible. */
for (j = 0; j < 7 ; j++)
if (mlc->di_map[j] == idx)
found++;
if (found)
continue;
if (!memcmp(mlc->di + idx, &mlc->di_scratch,
sizeof(mlc->di_scratch)))
break;
}
return idx >= HIL_MLC_DEVMEM ? -1 : idx;
}
static int hil_mlc_find_free_di(hil_mlc *mlc)
{
int idx;
/* TODO: Pick all-zero slots first, failing that,
* randomize the slot picked among those eligible.
*/
for (idx = 0; idx < HIL_MLC_DEVMEM; idx++) {
int j, found = 0;
for (j = 0; j < 7 ; j++)
if (mlc->di_map[j] == idx)
found++;
if (!found)
break;
}
return idx; /* Note: It is guaranteed at least one above will match */
}
static inline void hil_mlc_clean_serio_map(hil_mlc *mlc)
{
int idx;
for (idx = 0; idx < HIL_MLC_DEVMEM; idx++) {
int j, found = 0;
for (j = 0; j < 7 ; j++)
if (mlc->di_map[j] == idx)
found++;
if (!found)
mlc->serio_map[idx].di_revmap = -1;
}
}
static void hil_mlc_send_polls(hil_mlc *mlc)
{
int did, i, cnt;
struct serio *serio;
struct serio_driver *drv;
i = cnt = 0;
did = (mlc->ipacket[0] & HIL_PKT_ADDR_MASK) >> 8;
serio = did ? mlc->serio[mlc->di_map[did - 1]] : NULL;
drv = (serio != NULL) ? serio->drv : NULL;
while (mlc->icount < 15 - i) {
hil_packet p;
p = mlc->ipacket[i];
if (did != (p & HIL_PKT_ADDR_MASK) >> 8) {
if (drv && drv->interrupt) {
drv->interrupt(serio, 0, 0);
drv->interrupt(serio, HIL_ERR_INT >> 16, 0);
drv->interrupt(serio, HIL_PKT_CMD >> 8, 0);
drv->interrupt(serio, HIL_CMD_POL + cnt, 0);
}
did = (p & HIL_PKT_ADDR_MASK) >> 8;
serio = did ? mlc->serio[mlc->di_map[did-1]] : NULL;
drv = (serio != NULL) ? serio->drv : NULL;
cnt = 0;
}
cnt++;
i++;
if (drv && drv->interrupt) {
drv->interrupt(serio, (p >> 24), 0);
drv->interrupt(serio, (p >> 16) & 0xff, 0);
drv->interrupt(serio, (p >> 8) & ~HIL_PKT_ADDR_MASK, 0);
drv->interrupt(serio, p & 0xff, 0);
}
}
}
/*************************** State engine *********************************/
#define HILSEN_SCHED 0x000100 /* Schedule the tasklet */
#define HILSEN_BREAK 0x000200 /* Wait until next pass */
#define HILSEN_UP 0x000400 /* relative node#, decrement */
#define HILSEN_DOWN 0x000800 /* relative node#, increment */
#define HILSEN_FOLLOW 0x001000 /* use retval as next node# */
#define HILSEN_MASK 0x0000ff
#define HILSEN_START 0
#define HILSEN_RESTART 1
#define HILSEN_DHR 9
#define HILSEN_DHR2 10
#define HILSEN_IFC 14
#define HILSEN_HEAL0 16
#define HILSEN_HEAL 18
#define HILSEN_ACF 21
#define HILSEN_ACF2 22
#define HILSEN_DISC0 25
#define HILSEN_DISC 27
#define HILSEN_MATCH 40
#define HILSEN_OPERATE 41
#define HILSEN_PROBE 44
#define HILSEN_DSR 52
#define HILSEN_REPOLL 55
#define HILSEN_IFCACF 58
#define HILSEN_END 60
#define HILSEN_NEXT (HILSEN_DOWN | 1)
#define HILSEN_SAME (HILSEN_DOWN | 0)
#define HILSEN_LAST (HILSEN_UP | 1)
#define HILSEN_DOZE (HILSEN_SAME | HILSEN_SCHED | HILSEN_BREAK)
#define HILSEN_SLEEP (HILSEN_SAME | HILSEN_BREAK)
static int hilse_match(hil_mlc *mlc, int unused)
{
int rc;
rc = hil_mlc_match_di_scratch(mlc);
if (rc == -1) {
rc = hil_mlc_find_free_di(mlc);
if (rc == -1)
goto err;
#ifdef HIL_MLC_DEBUG
printk(KERN_DEBUG PREFIX "new in slot %i\n", rc);
#endif
hil_mlc_copy_di_scratch(mlc, rc);
mlc->di_map[mlc->ddi] = rc;
mlc->serio_map[rc].di_revmap = mlc->ddi;
hil_mlc_clean_serio_map(mlc);
serio_rescan(mlc->serio[rc]);
return -1;
}
mlc->di_map[mlc->ddi] = rc;
#ifdef HIL_MLC_DEBUG
printk(KERN_DEBUG PREFIX "same in slot %i\n", rc);
#endif
mlc->serio_map[rc].di_revmap = mlc->ddi;
hil_mlc_clean_serio_map(mlc);
return 0;
err:
printk(KERN_ERR PREFIX "Residual device slots exhausted, close some serios!\n");
return 1;
}
/* An LCV used to prevent runaway loops, forces 5 second sleep when reset. */
static int hilse_init_lcv(hil_mlc *mlc, int unused)
{
time64_t now = ktime_get_seconds();
if (mlc->lcv && (now - mlc->lcv_time) < 5)
return -1;
mlc->lcv_time = now;
mlc->lcv = 0;
return 0;
}
static int hilse_inc_lcv(hil_mlc *mlc, int lim)
{
return mlc->lcv++ >= lim ? -1 : 0;
}
#if 0
static int hilse_set_lcv(hil_mlc *mlc, int val)
{
mlc->lcv = val;
return 0;
}
#endif
/* Management of the discovered device index (zero based, -1 means no devs) */
static int hilse_set_ddi(hil_mlc *mlc, int val)
{
mlc->ddi = val;
hil_mlc_clear_di_map(mlc, val + 1);
return 0;
}
static int hilse_dec_ddi(hil_mlc *mlc, int unused)
{
mlc->ddi--;
if (mlc->ddi <= -1) {
mlc->ddi = -1;
hil_mlc_clear_di_map(mlc, 0);
return -1;
}
hil_mlc_clear_di_map(mlc, mlc->ddi + 1);
return 0;
}
static int hilse_inc_ddi(hil_mlc *mlc, int unused)
{
BUG_ON(mlc->ddi >= 6);
mlc->ddi++;
return 0;
}
static int hilse_take_idd(hil_mlc *mlc, int unused)
{
int i;
/* Help the state engine:
* Is this a real IDD response or just an echo?
*
* Real IDD response does not start with a command.
*/
if (mlc->ipacket[0] & HIL_PKT_CMD)
goto bail;
/* Should have the command echoed further down. */
for (i = 1; i < 16; i++) {
if (((mlc->ipacket[i] & HIL_PKT_ADDR_MASK) ==
(mlc->ipacket[0] & HIL_PKT_ADDR_MASK)) &&
(mlc->ipacket[i] & HIL_PKT_CMD) &&
((mlc->ipacket[i] & HIL_PKT_DATA_MASK) == HIL_CMD_IDD))
break;
}
if (i > 15)
goto bail;
/* And the rest of the packets should still be clear. */
while (++i < 16)
if (mlc->ipacket[i])
break;
if (i < 16)
goto bail;
for (i = 0; i < 16; i++)
mlc->di_scratch.idd[i] =
mlc->ipacket[i] & HIL_PKT_DATA_MASK;
/* Next step is to see if RSC supported */
if (mlc->di_scratch.idd[1] & HIL_IDD_HEADER_RSC)
return HILSEN_NEXT;
if (mlc->di_scratch.idd[1] & HIL_IDD_HEADER_EXD)
return HILSEN_DOWN | 4;
return 0;
bail:
mlc->ddi--;
return -1; /* This should send us off to ACF */
}
static int hilse_take_rsc(hil_mlc *mlc, int unused)
{
int i;
for (i = 0; i < 16; i++)
mlc->di_scratch.rsc[i] =
mlc->ipacket[i] & HIL_PKT_DATA_MASK;
/* Next step is to see if EXD supported (IDD has already been read) */
if (mlc->di_scratch.idd[1] & HIL_IDD_HEADER_EXD)
return HILSEN_NEXT;
return 0;
}
static int hilse_take_exd(hil_mlc *mlc, int unused)
{
int i;
for (i = 0; i < 16; i++)
mlc->di_scratch.exd[i] =
mlc->ipacket[i] & HIL_PKT_DATA_MASK;
/* Next step is to see if RNM supported. */
if (mlc->di_scratch.exd[0] & HIL_EXD_HEADER_RNM)
return HILSEN_NEXT;
return 0;
}
static int hilse_take_rnm(hil_mlc *mlc, int unused)
{
int i;
for (i = 0; i < 16; i++)
mlc->di_scratch.rnm[i] =
mlc->ipacket[i] & HIL_PKT_DATA_MASK;
printk(KERN_INFO PREFIX "Device name gotten: %16s\n",
mlc->di_scratch.rnm);
return 0;
}
static int hilse_operate(hil_mlc *mlc, int repoll)
{
if (mlc->opercnt == 0)
hil_mlcs_probe = 0;
mlc->opercnt = 1;
hil_mlc_send_polls(mlc);
if (!hil_mlcs_probe)
return 0;
hil_mlcs_probe = 0;
mlc->opercnt = 0;
return 1;
}
#define FUNC(funct, funct_arg, zero_rc, neg_rc, pos_rc) \
{ HILSE_FUNC, { .func = funct }, funct_arg, zero_rc, neg_rc, pos_rc },
#define OUT(pack) \
{ HILSE_OUT, { .packet = pack }, 0, HILSEN_NEXT, HILSEN_DOZE, 0 },
#define CTS \
{ HILSE_CTS, { .packet = 0 }, 0, HILSEN_NEXT | HILSEN_SCHED | HILSEN_BREAK, HILSEN_DOZE, 0 },
#define EXPECT(comp, to, got, got_wrong, timed_out) \
{ HILSE_EXPECT, { .packet = comp }, to, got, got_wrong, timed_out },
#define EXPECT_LAST(comp, to, got, got_wrong, timed_out) \
{ HILSE_EXPECT_LAST, { .packet = comp }, to, got, got_wrong, timed_out },
#define EXPECT_DISC(comp, to, got, got_wrong, timed_out) \
{ HILSE_EXPECT_DISC, { .packet = comp }, to, got, got_wrong, timed_out },
#define IN(to, got, got_error, timed_out) \
{ HILSE_IN, { .packet = 0 }, to, got, got_error, timed_out },
#define OUT_DISC(pack) \
{ HILSE_OUT_DISC, { .packet = pack }, 0, 0, 0, 0 },
#define OUT_LAST(pack) \
{ HILSE_OUT_LAST, { .packet = pack }, 0, 0, 0, 0 },
static const struct hilse_node hil_mlc_se[HILSEN_END] = {
/* 0 HILSEN_START */
FUNC(hilse_init_lcv, 0, HILSEN_NEXT, HILSEN_SLEEP, 0)
/* 1 HILSEN_RESTART */
FUNC(hilse_inc_lcv, 10, HILSEN_NEXT, HILSEN_START, 0)
OUT(HIL_CTRL_ONLY) /* Disable APE */
CTS
#define TEST_PACKET(x) \
(HIL_PKT_CMD | (x << HIL_PKT_ADDR_SHIFT) | x << 4 | x)
OUT(HIL_DO_ALTER_CTRL | HIL_CTRL_TEST | TEST_PACKET(0x5))
EXPECT(HIL_ERR_INT | TEST_PACKET(0x5),
2000, HILSEN_NEXT, HILSEN_RESTART, HILSEN_RESTART)
OUT(HIL_DO_ALTER_CTRL | HIL_CTRL_TEST | TEST_PACKET(0xa))
EXPECT(HIL_ERR_INT | TEST_PACKET(0xa),
2000, HILSEN_NEXT, HILSEN_RESTART, HILSEN_RESTART)
OUT(HIL_CTRL_ONLY | 0) /* Disable test mode */
/* 9 HILSEN_DHR */
FUNC(hilse_init_lcv, 0, HILSEN_NEXT, HILSEN_SLEEP, 0)
/* 10 HILSEN_DHR2 */
FUNC(hilse_inc_lcv, 10, HILSEN_NEXT, HILSEN_START, 0)
FUNC(hilse_set_ddi, -1, HILSEN_NEXT, 0, 0)
OUT(HIL_PKT_CMD | HIL_CMD_DHR)
IN(300000, HILSEN_DHR2, HILSEN_DHR2, HILSEN_NEXT)
/* 14 HILSEN_IFC */
OUT(HIL_PKT_CMD | HIL_CMD_IFC)
EXPECT(HIL_PKT_CMD | HIL_CMD_IFC | HIL_ERR_INT,
20000, HILSEN_DISC, HILSEN_DHR2, HILSEN_NEXT )
/* If devices are there, they weren't in PUP or other loopback mode.
* We're more concerned at this point with restoring operation
* to devices than discovering new ones, so we try to salvage
* the loop configuration by closing off the loop.
*/
/* 16 HILSEN_HEAL0 */
FUNC(hilse_dec_ddi, 0, HILSEN_NEXT, HILSEN_ACF, 0)
FUNC(hilse_inc_ddi, 0, HILSEN_NEXT, 0, 0)
/* 18 HILSEN_HEAL */
OUT_LAST(HIL_CMD_ELB)
EXPECT_LAST(HIL_CMD_ELB | HIL_ERR_INT,
20000, HILSEN_REPOLL, HILSEN_DSR, HILSEN_NEXT)
FUNC(hilse_dec_ddi, 0, HILSEN_HEAL, HILSEN_NEXT, 0)
/* 21 HILSEN_ACF */
FUNC(hilse_init_lcv, 0, HILSEN_NEXT, HILSEN_DOZE, 0)
/* 22 HILSEN_ACF2 */
FUNC(hilse_inc_lcv, 10, HILSEN_NEXT, HILSEN_START, 0)
OUT(HIL_PKT_CMD | HIL_CMD_ACF | 1)
IN(20000, HILSEN_NEXT, HILSEN_DSR, HILSEN_NEXT)
/* 25 HILSEN_DISC0 */
OUT_DISC(HIL_PKT_CMD | HIL_CMD_ELB)
EXPECT_DISC(HIL_PKT_CMD | HIL_CMD_ELB | HIL_ERR_INT,
20000, HILSEN_NEXT, HILSEN_DSR, HILSEN_DSR)
/* Only enter here if response just received */
/* 27 HILSEN_DISC */
OUT_DISC(HIL_PKT_CMD | HIL_CMD_IDD)
EXPECT_DISC(HIL_PKT_CMD | HIL_CMD_IDD | HIL_ERR_INT,
20000, HILSEN_NEXT, HILSEN_DSR, HILSEN_START)
FUNC(hilse_inc_ddi, 0, HILSEN_NEXT, HILSEN_START, 0)
FUNC(hilse_take_idd, 0, HILSEN_MATCH, HILSEN_IFCACF, HILSEN_FOLLOW)
OUT_LAST(HIL_PKT_CMD | HIL_CMD_RSC)
EXPECT_LAST(HIL_PKT_CMD | HIL_CMD_RSC | HIL_ERR_INT,
30000, HILSEN_NEXT, HILSEN_DSR, HILSEN_DSR)
FUNC(hilse_take_rsc, 0, HILSEN_MATCH, 0, HILSEN_FOLLOW)
OUT_LAST(HIL_PKT_CMD | HIL_CMD_EXD)
EXPECT_LAST(HIL_PKT_CMD | HIL_CMD_EXD | HIL_ERR_INT,
30000, HILSEN_NEXT, HILSEN_DSR, HILSEN_DSR)
FUNC(hilse_take_exd, 0, HILSEN_MATCH, 0, HILSEN_FOLLOW)
OUT_LAST(HIL_PKT_CMD | HIL_CMD_RNM)
EXPECT_LAST(HIL_PKT_CMD | HIL_CMD_RNM | HIL_ERR_INT,
30000, HILSEN_NEXT, HILSEN_DSR, HILSEN_DSR)
FUNC(hilse_take_rnm, 0, HILSEN_MATCH, 0, 0)
/* 40 HILSEN_MATCH */
FUNC(hilse_match, 0, HILSEN_NEXT, HILSEN_NEXT, /* TODO */ 0)
/* 41 HILSEN_OPERATE */
OUT(HIL_PKT_CMD | HIL_CMD_POL)
EXPECT(HIL_PKT_CMD | HIL_CMD_POL | HIL_ERR_INT,
20000, HILSEN_NEXT, HILSEN_DSR, HILSEN_NEXT)
FUNC(hilse_operate, 0, HILSEN_OPERATE, HILSEN_IFC, HILSEN_NEXT)
/* 44 HILSEN_PROBE */
OUT_LAST(HIL_PKT_CMD | HIL_CMD_EPT)
IN(10000, HILSEN_DISC, HILSEN_DSR, HILSEN_NEXT)
OUT_DISC(HIL_PKT_CMD | HIL_CMD_ELB)
IN(10000, HILSEN_DISC, HILSEN_DSR, HILSEN_NEXT)
OUT(HIL_PKT_CMD | HIL_CMD_ACF | 1)
IN(10000, HILSEN_DISC0, HILSEN_DSR, HILSEN_NEXT)
OUT_LAST(HIL_PKT_CMD | HIL_CMD_ELB)
IN(10000, HILSEN_OPERATE, HILSEN_DSR, HILSEN_DSR)
/* 52 HILSEN_DSR */
FUNC(hilse_set_ddi, -1, HILSEN_NEXT, 0, 0)
OUT(HIL_PKT_CMD | HIL_CMD_DSR)
IN(20000, HILSEN_DHR, HILSEN_DHR, HILSEN_IFC)
/* 55 HILSEN_REPOLL */
OUT(HIL_PKT_CMD | HIL_CMD_RPL)
EXPECT(HIL_PKT_CMD | HIL_CMD_RPL | HIL_ERR_INT,
20000, HILSEN_NEXT, HILSEN_DSR, HILSEN_NEXT)
FUNC(hilse_operate, 1, HILSEN_OPERATE, HILSEN_IFC, HILSEN_PROBE)
/* 58 HILSEN_IFCACF */
OUT(HIL_PKT_CMD | HIL_CMD_IFC)
EXPECT(HIL_PKT_CMD | HIL_CMD_IFC | HIL_ERR_INT,
20000, HILSEN_ACF2, HILSEN_DHR2, HILSEN_HEAL)
/* 60 HILSEN_END */
};
static inline void hilse_setup_input(hil_mlc *mlc, const struct hilse_node *node)
{
switch (node->act) {
case HILSE_EXPECT_DISC:
mlc->imatch = node->object.packet;
mlc->imatch |= ((mlc->ddi + 2) << HIL_PKT_ADDR_SHIFT);
break;
case HILSE_EXPECT_LAST:
mlc->imatch = node->object.packet;
mlc->imatch |= ((mlc->ddi + 1) << HIL_PKT_ADDR_SHIFT);
break;
case HILSE_EXPECT:
mlc->imatch = node->object.packet;
break;
case HILSE_IN:
mlc->imatch = 0;
break;
default:
BUG();
}
mlc->istarted = 1;
mlc->intimeout = usecs_to_jiffies(node->arg);
mlc->instart = jiffies;
mlc->icount = 15;
memset(mlc->ipacket, 0, 16 * sizeof(hil_packet));
BUG_ON(down_trylock(&mlc->isem));
}
#ifdef HIL_MLC_DEBUG
static int doze;
static int seidx; /* For debug */
#endif
static int hilse_donode(hil_mlc *mlc)
{
const struct hilse_node *node;
int nextidx = 0;
int sched_long = 0;
unsigned long flags;
#ifdef HIL_MLC_DEBUG
if (mlc->seidx && mlc->seidx != seidx &&
mlc->seidx != 41 && mlc->seidx != 42 && mlc->seidx != 43) {
printk(KERN_DEBUG PREFIX "z%i \n {%i}", doze, mlc->seidx);
doze = 0;
}
seidx = mlc->seidx;
#endif
node = hil_mlc_se + mlc->seidx;
switch (node->act) {
int rc;
hil_packet pack;
case HILSE_FUNC:
BUG_ON(node->object.func == NULL);
rc = node->object.func(mlc, node->arg);
nextidx = (rc > 0) ? node->ugly :
((rc < 0) ? node->bad : node->good);
if (nextidx == HILSEN_FOLLOW)
nextidx = rc;
break;
case HILSE_EXPECT_LAST:
case HILSE_EXPECT_DISC:
case HILSE_EXPECT:
case HILSE_IN:
/* Already set up from previous HILSE_OUT_* */
write_lock_irqsave(&mlc->lock, flags);
rc = mlc->in(mlc, node->arg);
if (rc == 2) {
nextidx = HILSEN_DOZE;
sched_long = 1;
write_unlock_irqrestore(&mlc->lock, flags);
break;
}
if (rc == 1)
nextidx = node->ugly;
else if (rc == 0)
nextidx = node->good;
else
nextidx = node->bad;
mlc->istarted = 0;
write_unlock_irqrestore(&mlc->lock, flags);
break;
case HILSE_OUT_LAST:
write_lock_irqsave(&mlc->lock, flags);
pack = node->object.packet;
pack |= ((mlc->ddi + 1) << HIL_PKT_ADDR_SHIFT);
goto out;
case HILSE_OUT_DISC:
write_lock_irqsave(&mlc->lock, flags);
pack = node->object.packet;
pack |= ((mlc->ddi + 2) << HIL_PKT_ADDR_SHIFT);
goto out;
case HILSE_OUT:
write_lock_irqsave(&mlc->lock, flags);
pack = node->object.packet;
out:
if (!mlc->istarted) {
/* Prepare to receive input */
if ((node + 1)->act & HILSE_IN)
hilse_setup_input(mlc, node + 1);
}
write_unlock_irqrestore(&mlc->lock, flags);
if (down_trylock(&mlc->osem)) {
nextidx = HILSEN_DOZE;
break;
}
up(&mlc->osem);
write_lock_irqsave(&mlc->lock, flags);
if (!mlc->ostarted) {
mlc->ostarted = 1;
mlc->opacket = pack;
rc = mlc->out(mlc);
nextidx = HILSEN_DOZE;
write_unlock_irqrestore(&mlc->lock, flags);
if (rc) {
hil_mlc_stop = 1;
return 1;
}
break;
}
mlc->ostarted = 0;
mlc->instart = jiffies;
write_unlock_irqrestore(&mlc->lock, flags);
nextidx = HILSEN_NEXT;
break;
case HILSE_CTS:
write_lock_irqsave(&mlc->lock, flags);
rc = mlc->cts(mlc);
nextidx = rc ? node->bad : node->good;
write_unlock_irqrestore(&mlc->lock, flags);
if (rc) {
hil_mlc_stop = 1;
return 1;
}
break;
default:
BUG();
}
#ifdef HIL_MLC_DEBUG
if (nextidx == HILSEN_DOZE)
doze++;
#endif
while (nextidx & HILSEN_SCHED) {
unsigned long now = jiffies;
if (!sched_long)
goto sched;
if (time_after(now, mlc->instart + mlc->intimeout))
goto sched;
mod_timer(&hil_mlcs_kicker, mlc->instart + mlc->intimeout);
break;
sched:
tasklet_schedule(&hil_mlcs_tasklet);
break;
}
if (nextidx & HILSEN_DOWN)
mlc->seidx += nextidx & HILSEN_MASK;
else if (nextidx & HILSEN_UP)
mlc->seidx -= nextidx & HILSEN_MASK;
else
mlc->seidx = nextidx & HILSEN_MASK;
if (nextidx & HILSEN_BREAK)
return 1;
return 0;
}
/******************** tasklet context functions **************************/
static void hil_mlcs_process(unsigned long unused)
{
struct list_head *tmp;
read_lock(&hil_mlcs_lock);
list_for_each(tmp, &hil_mlcs) {
struct hil_mlc *mlc = list_entry(tmp, hil_mlc, list);
while (hilse_donode(mlc) == 0) {
#ifdef HIL_MLC_DEBUG
if (mlc->seidx != 41 &&
mlc->seidx != 42 &&
mlc->seidx != 43)
printk(KERN_DEBUG PREFIX " + ");
#endif
}
}
read_unlock(&hil_mlcs_lock);
}
/************************* Keepalive timer task *********************/
static void hil_mlcs_timer(struct timer_list *unused)
{
if (hil_mlc_stop) {
/* could not send packet - stop immediately. */
pr_warn(PREFIX "HIL seems stuck - Disabling HIL MLC.\n");
return;
}
hil_mlcs_probe = 1;
tasklet_schedule(&hil_mlcs_tasklet);
/* Re-insert the periodic task. */
if (!timer_pending(&hil_mlcs_kicker))
mod_timer(&hil_mlcs_kicker, jiffies + HZ);
}
/******************** user/kernel context functions **********************/
static int hil_mlc_serio_write(struct serio *serio, unsigned char c)
{
struct hil_mlc_serio_map *map;
struct hil_mlc *mlc;
struct serio_driver *drv;
uint8_t *idx, *last;
map = serio->port_data;
BUG_ON(map == NULL);
mlc = map->mlc;
BUG_ON(mlc == NULL);
mlc->serio_opacket[map->didx] |=
((hil_packet)c) << (8 * (3 - mlc->serio_oidx[map->didx]));
if (mlc->serio_oidx[map->didx] >= 3) {
/* for now only commands */
if (!(mlc->serio_opacket[map->didx] & HIL_PKT_CMD))
return -EIO;
switch (mlc->serio_opacket[map->didx] & HIL_PKT_DATA_MASK) {
case HIL_CMD_IDD:
idx = mlc->di[map->didx].idd;
goto emu;
case HIL_CMD_RSC:
idx = mlc->di[map->didx].rsc;
goto emu;
case HIL_CMD_EXD:
idx = mlc->di[map->didx].exd;
goto emu;
case HIL_CMD_RNM:
idx = mlc->di[map->didx].rnm;
goto emu;
default:
break;
}
mlc->serio_oidx[map->didx] = 0;
mlc->serio_opacket[map->didx] = 0;
}
mlc->serio_oidx[map->didx]++;
return -EIO;
emu:
drv = serio->drv;
BUG_ON(drv == NULL);
last = idx + 15;
while ((last != idx) && (*last == 0))
last--;
while (idx != last) {
drv->interrupt(serio, 0, 0);
drv->interrupt(serio, HIL_ERR_INT >> 16, 0);
drv->interrupt(serio, 0, 0);
drv->interrupt(serio, *idx, 0);
idx++;
}
drv->interrupt(serio, 0, 0);
drv->interrupt(serio, HIL_ERR_INT >> 16, 0);
drv->interrupt(serio, HIL_PKT_CMD >> 8, 0);
drv->interrupt(serio, *idx, 0);
mlc->serio_oidx[map->didx] = 0;
mlc->serio_opacket[map->didx] = 0;
return 0;
}
static int hil_mlc_serio_open(struct serio *serio)
{
struct hil_mlc_serio_map *map;
struct hil_mlc *mlc;
if (serio_get_drvdata(serio) != NULL)
return -EBUSY;
map = serio->port_data;
BUG_ON(map == NULL);
mlc = map->mlc;
BUG_ON(mlc == NULL);
return 0;
}
static void hil_mlc_serio_close(struct serio *serio)
{
struct hil_mlc_serio_map *map;
struct hil_mlc *mlc;
map = serio->port_data;
BUG_ON(map == NULL);
mlc = map->mlc;
BUG_ON(mlc == NULL);
serio_set_drvdata(serio, NULL);
serio->drv = NULL;
/* TODO wake up interruptable */
}
static const struct serio_device_id hil_mlc_serio_id = {
.type = SERIO_HIL_MLC,
.proto = SERIO_HIL,
.extra = SERIO_ANY,
.id = SERIO_ANY,
};
int hil_mlc_register(hil_mlc *mlc)
{
int i;
unsigned long flags;
BUG_ON(mlc == NULL);
mlc->istarted = 0;
mlc->ostarted = 0;
rwlock_init(&mlc->lock);
sema_init(&mlc->osem, 1);
sema_init(&mlc->isem, 1);
mlc->icount = -1;
mlc->imatch = 0;
mlc->opercnt = 0;
sema_init(&(mlc->csem), 0);
hil_mlc_clear_di_scratch(mlc);
hil_mlc_clear_di_map(mlc, 0);
for (i = 0; i < HIL_MLC_DEVMEM; i++) {
struct serio *mlc_serio;
hil_mlc_copy_di_scratch(mlc, i);
mlc_serio = kzalloc(sizeof(*mlc_serio), GFP_KERNEL);
mlc->serio[i] = mlc_serio;
if (!mlc->serio[i]) {
for (; i >= 0; i--)
kfree(mlc->serio[i]);
return -ENOMEM;
}
snprintf(mlc_serio->name, sizeof(mlc_serio->name)-1, "HIL_SERIO%d", i);
snprintf(mlc_serio->phys, sizeof(mlc_serio->phys)-1, "HIL%d", i);
mlc_serio->id = hil_mlc_serio_id;
mlc_serio->id.id = i; /* HIL port no. */
mlc_serio->write = hil_mlc_serio_write;
mlc_serio->open = hil_mlc_serio_open;
mlc_serio->close = hil_mlc_serio_close;
mlc_serio->port_data = &(mlc->serio_map[i]);
mlc->serio_map[i].mlc = mlc;
mlc->serio_map[i].didx = i;
mlc->serio_map[i].di_revmap = -1;
mlc->serio_opacket[i] = 0;
mlc->serio_oidx[i] = 0;
serio_register_port(mlc_serio);
}
mlc->tasklet = &hil_mlcs_tasklet;
write_lock_irqsave(&hil_mlcs_lock, flags);
list_add_tail(&mlc->list, &hil_mlcs);
mlc->seidx = HILSEN_START;
write_unlock_irqrestore(&hil_mlcs_lock, flags);
tasklet_schedule(&hil_mlcs_tasklet);
return 0;
}
int hil_mlc_unregister(hil_mlc *mlc)
{
struct list_head *tmp;
unsigned long flags;
int i;
BUG_ON(mlc == NULL);
write_lock_irqsave(&hil_mlcs_lock, flags);
list_for_each(tmp, &hil_mlcs)
if (list_entry(tmp, hil_mlc, list) == mlc)
goto found;
/* not found in list */
write_unlock_irqrestore(&hil_mlcs_lock, flags);
tasklet_schedule(&hil_mlcs_tasklet);
return -ENODEV;
found:
list_del(tmp);
write_unlock_irqrestore(&hil_mlcs_lock, flags);
for (i = 0; i < HIL_MLC_DEVMEM; i++) {
serio_unregister_port(mlc->serio[i]);
mlc->serio[i] = NULL;
}
tasklet_schedule(&hil_mlcs_tasklet);
return 0;
}
/**************************** Module interface *************************/
static int __init hil_mlc_init(void)
{
timer_setup(&hil_mlcs_kicker, &hil_mlcs_timer, 0);
mod_timer(&hil_mlcs_kicker, jiffies + HZ);
tasklet_enable(&hil_mlcs_tasklet);
return 0;
}
static void __exit hil_mlc_exit(void)
{
del_timer_sync(&hil_mlcs_kicker);
tasklet_kill(&hil_mlcs_tasklet);
}
module_init(hil_mlc_init);
module_exit(hil_mlc_exit);
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