hil_mlc.c
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上传日期:2013-04-10
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- /*
- * 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 tasket 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/timer.h>
- #include <linux/sched.h>
- #include <linux/list.h>
- MODULE_AUTHOR("Brian S. Julin <bri@calyx.com>");
- 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 rwlock_t hil_mlcs_lock = RW_LOCK_UNLOCKED;
- static struct timer_list hil_mlcs_kicker;
- static int hil_mlcs_probe;
- static void hil_mlcs_process(unsigned long unused);
- DECLARE_TASKLET_DISABLED(hil_mlcs_tasklet, hil_mlcs_process, 0);
- /* #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;
- /* In-use slots are not eligible. */
- found = 0;
- 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;
- 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;
- 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_dev *dev;
- i = cnt = 0;
- did = (mlc->ipacket[0] & HIL_PKT_ADDR_MASK) >> 8;
- serio = did ? &(mlc->serio[mlc->di_map[did - 1]]) : NULL;
- dev = (serio != NULL) ? serio->dev : NULL;
- while (mlc->icount < 15 - i) {
- hil_packet p;
- p = mlc->ipacket[i];
- if (did != (p & HIL_PKT_ADDR_MASK) >> 8) {
- if (dev == NULL || dev->interrupt == NULL) goto skip;
- dev->interrupt(serio, 0, 0);
- dev->interrupt(serio, HIL_ERR_INT >> 16, 0);
- dev->interrupt(serio, HIL_PKT_CMD >> 8, 0);
- dev->interrupt(serio, HIL_CMD_POL + cnt, 0);
- skip:
- did = (p & HIL_PKT_ADDR_MASK) >> 8;
- serio = did ? &(mlc->serio[mlc->di_map[did-1]]) : NULL;
- dev = (serio != NULL) ? serio->dev : NULL;
- cnt = 0;
- }
- cnt++; i++;
- if (dev == NULL || dev->interrupt == NULL) continue;
- dev->interrupt(serio, (p >> 24), 0);
- dev->interrupt(serio, (p >> 16) & 0xff, 0);
- dev->interrupt(serio, (p >> 8) & ~HIL_PKT_ADDR_MASK, 0);
- dev->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 %in", 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 %in", 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) {
- struct timeval tv;
- do_gettimeofday(&tv);
- if(mlc->lcv == 0) goto restart; /* First init, no need to dally */
- if(tv.tv_sec - mlc->lcv_tv.tv_sec < 5) return -1;
- restart:
- mlc->lcv_tv = tv;
- mlc->lcv = 0;
- return 0;
- }
- static int hilse_inc_lcv(hil_mlc *mlc, int lim) {
- if (mlc->lcv++ >= lim) return -1;
- return 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) {
- if (mlc->ddi >= 6) {
- BUG();
- return -1;
- }
- 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;
- }
- do {
- char nam[17];
- snprintf(nam, 16, "%s", mlc->di_scratch.rnm);
- nam[16] = ' ';
- printk(KERN_INFO PREFIX "Device name gotten: %sn", nam);
- } while (0);
- 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 },
- 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, 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 = node->arg;
- do_gettimeofday(&(mlc->instart));
- mlc->icount = 15;
- memset(mlc->ipacket, 0, 16 * sizeof(hil_packet));
- if (down_trylock(&(mlc->isem))) BUG();
- return;
- }
- #ifdef HIL_MLC_DEBUG
- static int doze = 0;
- static int seidx; /* For debug */
- static int kick = 1;
- #endif
- static int hilse_donode (hil_mlc *mlc) {
- 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%s {%i}", doze, kick ? "K" : "", mlc->seidx);
- doze = 0;
- }
- kick = 0;
- seidx = mlc->seidx;
- #endif
- node = hil_mlc_se + mlc->seidx;
- switch (node->act) {
- int rc;
- hil_packet pack;
- case HILSE_FUNC:
- if (node->object.func == NULL) break;
- 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) goto out2;
- /* Prepare to receive input */
- if ((node + 1)->act & HILSE_IN)
- hilse_setup_input(mlc, node + 1);
- out2:
- 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;
- mlc->out(mlc);
- nextidx = HILSEN_DOZE;
- write_unlock_irqrestore(&(mlc->lock), flags);
- break;
- }
- mlc->ostarted = 0;
- do_gettimeofday(&(mlc->instart));
- write_unlock_irqrestore(&(mlc->lock), flags);
- nextidx = HILSEN_NEXT;
- break;
- case HILSE_CTS:
- nextidx = mlc->cts(mlc) ? node->bad : node->good;
- break;
- default:
- BUG();
- nextidx = 0;
- break;
- }
- #ifdef HIL_MLC_DEBUG
- if (nextidx == HILSEN_DOZE) doze++;
- #endif
- while (nextidx & HILSEN_SCHED) {
- struct timeval tv;
- if (!sched_long) goto sched;
- do_gettimeofday(&tv);
- tv.tv_usec += 1000000 * (tv.tv_sec - mlc->instart.tv_sec);
- tv.tv_usec -= mlc->instart.tv_usec;
- if (tv.tv_usec >= mlc->intimeout) goto sched;
- tv.tv_usec = (mlc->intimeout - tv.tv_usec) * HZ / 1000000;
- if (!tv.tv_usec) goto sched;
- mod_timer(&hil_mlcs_kicker, jiffies + tv.tv_usec);
- 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 *********************/
- void hil_mlcs_timer (unsigned long data) {
- 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_dev *dev;
- uint8_t *idx, *last;
- map = serio->driver;
- if (map == NULL) {
- BUG();
- return -EIO;
- }
- mlc = map->mlc;
- if (mlc == NULL) {
- BUG();
- return -EIO;
- }
- 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:
- dev = serio->dev;
- if (dev == NULL) {
- BUG();
- return -EIO;
- }
- last = idx + 15;
- while ((last != idx) && (*last == 0)) last--;
- while (idx != last) {
- dev->interrupt(serio, 0, 0);
- dev->interrupt(serio, HIL_ERR_INT >> 16, 0);
- dev->interrupt(serio, 0, 0);
- dev->interrupt(serio, *idx, 0);
- idx++;
- }
- dev->interrupt(serio, 0, 0);
- dev->interrupt(serio, HIL_ERR_INT >> 16, 0);
- dev->interrupt(serio, HIL_PKT_CMD >> 8, 0);
- dev->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->private != NULL) return -EBUSY;
- map = serio->driver;
- if (map == NULL) {
- BUG();
- return -ENODEV;
- }
- mlc = map->mlc;
- if (mlc == NULL) {
- BUG();
- return -ENODEV;
- }
- mlc->inc_use_count();
- return 0;
- }
- static void hil_mlc_serio_close(struct serio *serio) {
- struct hil_mlc_serio_map *map;
- struct hil_mlc *mlc;
- map = serio->driver;
- if (map == NULL) {
- BUG();
- return;
- }
- mlc = map->mlc;
- if (mlc == NULL) {
- BUG();
- return;
- }
- mlc->dec_use_count();
- serio->private = NULL;
- serio->dev = NULL;
- /* TODO wake up interruptable */
- }
- int hil_mlc_register(hil_mlc *mlc) {
- int i;
- unsigned long flags;
- MOD_INC_USE_COUNT;
- if (mlc == NULL) {
- MOD_DEC_USE_COUNT;
- return -EINVAL;
- }
- mlc->istarted = 0;
- mlc->ostarted = 0;
- mlc->lock = RW_LOCK_UNLOCKED;
- init_MUTEX(&(mlc->osem));
- init_MUTEX(&(mlc->isem));
- mlc->icount = -1;
- mlc->imatch = 0;
- mlc->opercnt = 0;
- init_MUTEX_LOCKED(&(mlc->csem));
- hil_mlc_clear_di_scratch(mlc);
- hil_mlc_clear_di_map(mlc, 0);
- for (i = 0; i < HIL_MLC_DEVMEM; i++) {
- hil_mlc_copy_di_scratch(mlc, i);
- memset(&(mlc->serio[i]), 0, sizeof(mlc->serio[0]));
- mlc->serio[i].type = SERIO_HIL | SERIO_HIL_MLC;
- mlc->serio[i].write = hil_mlc_serio_write;
- mlc->serio[i].open = hil_mlc_serio_open;
- mlc->serio[i].close = hil_mlc_serio_close;
- mlc->serio[i].driver = &(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[i]));
- }
- 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;
- if (mlc == NULL)
- return -EINVAL;
- 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);
- MOD_DEC_USE_COUNT;
- for (i = 0; i < HIL_MLC_DEVMEM; i++)
- serio_unregister_port(&(mlc->serio[i]));
- tasklet_schedule(&hil_mlcs_tasklet);
- return 0;
- }
- /**************************** Module interface *************************/
- static int __init hil_mlc_init(void)
- {
- init_timer(&hil_mlcs_kicker);
- hil_mlcs_kicker.expires = jiffies + HZ;
- hil_mlcs_kicker.function = &hil_mlcs_timer;
- add_timer(&hil_mlcs_kicker);
- tasklet_enable(&hil_mlcs_tasklet);
- return 0;
- }
-
- static void __exit hil_mlc_exit(void)
- {
- del_timer(&hil_mlcs_kicker);
- tasklet_disable(&hil_mlcs_tasklet);
- tasklet_kill(&hil_mlcs_tasklet);
- }
-
- module_init(hil_mlc_init);
- module_exit(hil_mlc_exit);