hp_sdc.c
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上传日期:2013-04-10
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- /*
- * HP i8042-based System Device Controller 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:
- * System Device Controller Microprocessor Firmware Theory of Operation
- * for Part Number 1820-4784 Revision B. Dwg No. A-1820-4784-2
- * Helge Deller's original hilkbd.c port for PA-RISC.
- *
- *
- * Driver theory of operation:
- *
- * hp_sdc_put does all writing to the SDC. ISR can run on a different
- * CPU than hp_sdc_put, but only one CPU runs hp_sdc_put at a time
- * (it cannot really benefit from SMP anyway.) A tasket fit this perfectly.
- *
- * All data coming back from the SDC is sent via interrupt and can be read
- * fully in the ISR, so there are no latency/throughput problems there.
- * The problem is with output, due to the slow clock speed of the SDC
- * compared to the CPU. This should not be too horrible most of the time,
- * but if used with HIL devices that support the multibyte transfer command,
- * keeping outbound throughput flowing at the 6500KBps that the HIL is
- * capable of is more than can be done at HZ=100.
- *
- * Busy polling for IBF clear wastes CPU cycles and bus cycles. hp_sdc.ibf
- * is set to 0 when the IBF flag in the status register has cleared. ISR
- * may do this, and may also access the parts of queued transactions related
- * to reading data back from the SDC, but otherwise will not touch the
- * hp_sdc state. Whenever a register is written hp_sdc.ibf is set to 1.
- *
- * The i8042 write index and the values in the 4-byte input buffer
- * starting at 0x70 are kept track of in hp_sdc.wi, and .r7[], respectively,
- * to minimize the amount of IO needed to the SDC. However these values
- * do not need to be locked since they are only ever accessed by hp_sdc_put.
- *
- * A timer task schedules the tasklet once per second just to make
- * sure it doesn't freeze up and to allow for bad reads to time out.
- */
- #include <linux/hp_sdc.h>
- #include <linux/sched.h>
- #include <linux/errno.h>
- #include <linux/init.h>
- #include <linux/module.h>
- #include <linux/ioport.h>
- #include <linux/time.h>
- #include <linux/slab.h>
- #include <linux/hil.h>
- #include <asm/io.h>
- #include <asm/system.h>
- #include <asm/gsc.h>
- #define PREFIX "HP SDC: "
- MODULE_AUTHOR("Brian S. Julin <bri@calyx.com>");
- MODULE_DESCRIPTION("HP i8042-based SDC Driver");
- MODULE_LICENSE("Dual BSD/GPL");
- EXPORT_SYMBOL(hp_sdc_request_timer_irq);
- EXPORT_SYMBOL(hp_sdc_request_hil_irq);
- EXPORT_SYMBOL(hp_sdc_request_cooked_irq);
- EXPORT_SYMBOL(hp_sdc_release_timer_irq);
- EXPORT_SYMBOL(hp_sdc_release_hil_irq);
- EXPORT_SYMBOL(hp_sdc_release_cooked_irq);
- EXPORT_SYMBOL(hp_sdc_enqueue_transaction);
- EXPORT_SYMBOL(hp_sdc_dequeue_transaction);
- static hp_i8042_sdc hp_sdc; /* All driver state is kept in here. */
- /*************** primitives for use in any context *********************/
- static inline uint8_t hp_sdc_status_in8 (void) {
- uint8_t status;
- unsigned long flags;
- write_lock_irqsave(&hp_sdc.ibf_lock, flags);
- status = gsc_readb(hp_sdc.status_io);
- if (!(status & HP_SDC_STATUS_IBF)) hp_sdc.ibf = 0;
- write_unlock_irqrestore(&hp_sdc.ibf_lock, flags);
- return status;
- }
- static inline uint8_t hp_sdc_data_in8 (void) {
- return gsc_readb(hp_sdc.data_io);
- }
- static inline void hp_sdc_status_out8 (uint8_t val) {
- unsigned long flags;
- write_lock_irqsave(&hp_sdc.ibf_lock, flags);
- hp_sdc.ibf = 1;
- if ((val & 0xf0) == 0xe0) hp_sdc.wi = 0xff;
- gsc_writeb(val, hp_sdc.status_io);
- write_unlock_irqrestore(&hp_sdc.ibf_lock, flags);
- }
- static inline void hp_sdc_data_out8 (uint8_t val) {
- unsigned long flags;
- write_lock_irqsave(&hp_sdc.ibf_lock, flags);
- hp_sdc.ibf = 1;
- gsc_writeb(val, hp_sdc.data_io);
- write_unlock_irqrestore(&hp_sdc.ibf_lock, flags);
- }
- /* Care must be taken to only invoke hp_sdc_spin_ibf when
- * absolutely needed, or in rarely invoked subroutines.
- * Not only does it waste CPU cycles, it also wastes bus cycles.
- */
- static inline void hp_sdc_spin_ibf(void) {
- unsigned long flags;
- rwlock_t *lock;
- lock = &hp_sdc.ibf_lock;
- read_lock_irqsave(lock, flags);
- if (!hp_sdc.ibf) {
- read_unlock_irqrestore(lock, flags);
- return;
- }
- read_unlock(lock);
- write_lock(lock);
- while (gsc_readb(hp_sdc.status_io) & HP_SDC_STATUS_IBF) {};
- hp_sdc.ibf = 0;
- write_unlock_irqrestore(lock, flags);
- }
- /************************ Interrupt context functions ************************/
- static void hp_sdc_take (int irq, void *dev_id, uint8_t status, uint8_t data) {
- hp_sdc_transaction *curr;
- read_lock(&hp_sdc.rtq_lock);
- if (hp_sdc.rcurr < 0) {
- read_unlock(&hp_sdc.rtq_lock);
- return;
- }
- curr = hp_sdc.tq[hp_sdc.rcurr];
- read_unlock(&hp_sdc.rtq_lock);
- curr->seq[curr->idx++] = status;
- curr->seq[curr->idx++] = data;
- hp_sdc.rqty -= 2;
- do_gettimeofday(&hp_sdc.rtv);
- if (hp_sdc.rqty <= 0) {
- /* All data has been gathered. */
- if(curr->seq[curr->actidx] & HP_SDC_ACT_SEMAPHORE) {
- if (curr->act.semaphore) up(curr->act.semaphore);
- }
- if(curr->seq[curr->actidx] & HP_SDC_ACT_CALLBACK) {
- if (curr->act.irqhook)
- curr->act.irqhook(irq, dev_id, status, data);
- }
- curr->actidx = curr->idx;
- curr->idx++;
- /* Return control of this transaction */
- write_lock(&hp_sdc.rtq_lock);
- hp_sdc.rcurr = -1;
- hp_sdc.rqty = 0;
- write_unlock(&hp_sdc.rtq_lock);
- tasklet_schedule(&hp_sdc.task);
- }
- }
- static void hp_sdc_isr(int irq, void *dev_id, struct pt_regs * regs) {
- uint8_t status, data;
- status = hp_sdc_status_in8();
- /* Read data unconditionally to advance i8042. */
- data = hp_sdc_data_in8();
- /* For now we are ignoring these until we get the SDC to behave. */
- if (((status & 0xf1) == 0x51) && data == 0x82) {
- return;
- }
- switch(status & HP_SDC_STATUS_IRQMASK) {
- case 0: /* This case is not documented. */
- break;
- case HP_SDC_STATUS_USERTIMER:
- case HP_SDC_STATUS_PERIODIC:
- case HP_SDC_STATUS_TIMER:
- read_lock(&hp_sdc.hook_lock);
- if (hp_sdc.timer != NULL)
- hp_sdc.timer(irq, dev_id, status, data);
- read_unlock(&hp_sdc.hook_lock);
- break;
- case HP_SDC_STATUS_REG:
- hp_sdc_take(irq, dev_id, status, data);
- break;
- case HP_SDC_STATUS_HILCMD:
- case HP_SDC_STATUS_HILDATA:
- read_lock(&hp_sdc.hook_lock);
- if (hp_sdc.hil != NULL)
- hp_sdc.hil(irq, dev_id, status, data);
- read_unlock(&hp_sdc.hook_lock);
- break;
- case HP_SDC_STATUS_PUP:
- read_lock(&hp_sdc.hook_lock);
- if (hp_sdc.pup != NULL)
- hp_sdc.pup(irq, dev_id, status, data);
- else printk(KERN_INFO PREFIX "HP SDC reports successful PUP.n");
- read_unlock(&hp_sdc.hook_lock);
- break;
- default:
- read_lock(&hp_sdc.hook_lock);
- if (hp_sdc.cooked != NULL)
- hp_sdc.cooked(irq, dev_id, status, data);
- read_unlock(&hp_sdc.hook_lock);
- break;
- }
- }
- static void hp_sdc_nmisr(int irq, void *dev_id, struct pt_regs * regs) {
- int status;
-
- status = hp_sdc_status_in8();
- printk(KERN_WARNING PREFIX "NMI !n");
- #if 0
- if (status & HP_SDC_NMISTATUS_FHS) {
- read_lock(&hp_sdc.hook_lock);
- if (hp_sdc.timer != NULL)
- hp_sdc.timer(irq, dev_id, status, 0);
- read_unlock(&hp_sdc.hook_lock);
- }
- else {
- /* TODO: pass this on to the HIL handler, or do SAK here? */
- printk(KERN_WARNING PREFIX "HIL NMIn");
- }
- #endif
- }
- /***************** Kernel (tasklet) context functions ****************/
- unsigned long hp_sdc_put(void);
- static void hp_sdc_tasklet(unsigned long foo) {
- write_lock_irq(&hp_sdc.rtq_lock);
- if (hp_sdc.rcurr >= 0) {
- struct timeval tv;
- do_gettimeofday(&tv);
- if (tv.tv_sec > hp_sdc.rtv.tv_sec) tv.tv_usec += 1000000;
- if (tv.tv_usec - hp_sdc.rtv.tv_usec > HP_SDC_MAX_REG_DELAY) {
- hp_sdc_transaction *curr;
- uint8_t tmp;
- curr = hp_sdc.tq[hp_sdc.rcurr];
- /* If this turns out to be a normal failure mode
- * we'll need to figure out a way to communicate
- * it back to the application. and be less verbose.
- */
- printk(KERN_WARNING PREFIX "read timeout (%ius)!n",
- tv.tv_usec - hp_sdc.rtv.tv_usec);
- curr->idx += hp_sdc.rqty;
- hp_sdc.rqty = 0;
- tmp = curr->seq[curr->actidx];
- curr->seq[curr->actidx] |= HP_SDC_ACT_DEAD;
- if(tmp & HP_SDC_ACT_SEMAPHORE) {
- if (curr->act.semaphore)
- up(curr->act.semaphore);
- }
- if(tmp & HP_SDC_ACT_CALLBACK) {
- /* Note this means that irqhooks may be called
- * in tasklet/bh context.
- */
- if (curr->act.irqhook)
- curr->act.irqhook(0, 0, 0, 0);
- }
- curr->actidx = curr->idx;
- curr->idx++;
- hp_sdc.rcurr = -1;
- }
- }
- write_unlock_irq(&hp_sdc.rtq_lock);
- hp_sdc_put();
- }
- unsigned long hp_sdc_put(void) {
- hp_sdc_transaction *curr;
- uint8_t act;
- int idx, curridx;
- int limit = 0;
- write_lock(&hp_sdc.lock);
- /* If i8042 buffers are full, we cannot do anything that
- requires output, so we skip to the administrativa. */
- if (hp_sdc.ibf) {
- hp_sdc_status_in8();
- if (hp_sdc.ibf) goto finish;
- }
- anew:
- /* See if we are in the middle of a sequence. */
- if (hp_sdc.wcurr < 0) hp_sdc.wcurr = 0;
- read_lock_irq(&hp_sdc.rtq_lock);
- if (hp_sdc.rcurr == hp_sdc.wcurr) hp_sdc.wcurr++;
- read_unlock_irq(&hp_sdc.rtq_lock);
- if (hp_sdc.wcurr >= HP_SDC_QUEUE_LEN) hp_sdc.wcurr = 0;
- curridx = hp_sdc.wcurr;
- if (hp_sdc.tq[curridx] != NULL) goto start;
- while (++curridx != hp_sdc.wcurr) {
- if (curridx >= HP_SDC_QUEUE_LEN) {
- curridx = -1; /* Wrap to top */
- continue;
- }
- read_lock_irq(&hp_sdc.rtq_lock);
- if (hp_sdc.rcurr == curridx) {
- read_unlock_irq(&hp_sdc.rtq_lock);
- continue;
- }
- read_unlock_irq(&hp_sdc.rtq_lock);
- if (hp_sdc.tq[curridx] != NULL) break; /* Found one. */
- }
- if (curridx == hp_sdc.wcurr) { /* There's nothing queued to do. */
- curridx = -1;
- }
- hp_sdc.wcurr = curridx;
- start:
- /* Check to see if the interrupt mask needs to be set. */
- if (hp_sdc.set_im) {
- hp_sdc_status_out8(hp_sdc.im | HP_SDC_CMD_SET_IM);
- hp_sdc.set_im = 0;
- goto finish;
- }
- if (hp_sdc.wcurr == -1) goto done;
- curr = hp_sdc.tq[curridx];
- idx = curr->actidx;
- if (curr->actidx >= curr->endidx) {
- hp_sdc.tq[curridx] = NULL;
- /* Interleave outbound data between the transactions. */
- hp_sdc.wcurr++;
- if (hp_sdc.wcurr >= HP_SDC_QUEUE_LEN) hp_sdc.wcurr = 0;
- goto finish;
- }
- act = curr->seq[idx];
- idx++;
- if (curr->idx >= curr->endidx) {
- if (act & HP_SDC_ACT_DEALLOC) kfree(curr);
- hp_sdc.tq[curridx] = NULL;
- /* Interleave outbound data between the transactions. */
- hp_sdc.wcurr++;
- if (hp_sdc.wcurr >= HP_SDC_QUEUE_LEN) hp_sdc.wcurr = 0;
- goto finish;
- }
- while (act & HP_SDC_ACT_PRECMD) {
- if (curr->idx != idx) {
- idx++;
- act &= ~HP_SDC_ACT_PRECMD;
- break;
- }
- hp_sdc_status_out8(curr->seq[idx]);
- curr->idx++;
- /* act finished? */
- if ((act & HP_SDC_ACT_DURING) == HP_SDC_ACT_PRECMD)
- goto actdone;
- /* skip quantity field if data-out sequence follows. */
- if (act & HP_SDC_ACT_DATAOUT) curr->idx++;
- goto finish;
- }
- if (act & HP_SDC_ACT_DATAOUT) {
- int qty;
- qty = curr->seq[idx];
- idx++;
- if (curr->idx - idx < qty) {
- hp_sdc_data_out8(curr->seq[curr->idx]);
- curr->idx++;
- /* act finished? */
- if ((curr->idx - idx >= qty) &&
- ((act & HP_SDC_ACT_DURING) == HP_SDC_ACT_DATAOUT))
- goto actdone;
- goto finish;
- }
- idx += qty;
- act &= ~HP_SDC_ACT_DATAOUT;
- }
- else while (act & HP_SDC_ACT_DATAREG) {
- int mask;
- uint8_t w7[4];
- mask = curr->seq[idx];
- if (idx != curr->idx) {
- idx++;
- idx += !!(mask & 1);
- idx += !!(mask & 2);
- idx += !!(mask & 4);
- idx += !!(mask & 8);
- act &= ~HP_SDC_ACT_DATAREG;
- break;
- }
-
- w7[0] = (mask & 1) ? curr->seq[++idx] : hp_sdc.r7[0];
- w7[1] = (mask & 2) ? curr->seq[++idx] : hp_sdc.r7[1];
- w7[2] = (mask & 4) ? curr->seq[++idx] : hp_sdc.r7[2];
- w7[3] = (mask & 8) ? curr->seq[++idx] : hp_sdc.r7[3];
-
- if (hp_sdc.wi > 0x73 || hp_sdc.wi < 0x70 ||
- w7[hp_sdc.wi-0x70] == hp_sdc.r7[hp_sdc.wi-0x70]) {
- int i = 0;
- /* Need to point the write index register */
- while ((i < 4) && w7[i] == hp_sdc.r7[i]) i++;
- if (i < 4) {
- hp_sdc_status_out8(HP_SDC_CMD_SET_D0 + i);
- hp_sdc.wi = 0x70 + i;
- goto finish;
- }
- idx++;
- if ((act & HP_SDC_ACT_DURING) == HP_SDC_ACT_DATAREG)
- goto actdone;
- curr->idx = idx;
- act &= ~HP_SDC_ACT_DATAREG;
- break;
- }
- hp_sdc_data_out8(w7[hp_sdc.wi - 0x70]);
- hp_sdc.r7[hp_sdc.wi - 0x70] = w7[hp_sdc.wi - 0x70];
- hp_sdc.wi++; /* write index register autoincrements */
- {
- int i = 0;
- while ((i < 4) && w7[i] == hp_sdc.r7[i]) i++;
- if (i >= 4) {
- curr->idx = idx + 1;
- if ((act & HP_SDC_ACT_DURING) ==
- HP_SDC_ACT_DATAREG)
- goto actdone;
- }
- }
- goto finish;
- }
- /* We don't go any further in the command if there is a pending read,
- because we don't want interleaved results. */
- read_lock_irq(&hp_sdc.rtq_lock);
- if (hp_sdc.rcurr >= 0) {
- read_unlock_irq(&hp_sdc.rtq_lock);
- goto finish;
- }
- read_unlock_irq(&hp_sdc.rtq_lock);
- if (act & HP_SDC_ACT_POSTCMD) {
- uint8_t postcmd;
- /* curr->idx should == idx at this point. */
- postcmd = curr->seq[idx];
- curr->idx++;
- if (act & HP_SDC_ACT_DATAIN) {
- /* Start a new read */
- hp_sdc.rqty = curr->seq[curr->idx];
- do_gettimeofday(&hp_sdc.rtv);
- curr->idx++;
- /* Still need to lock here in case of spurious irq. */
- write_lock_irq(&hp_sdc.rtq_lock);
- hp_sdc.rcurr = curridx;
- write_unlock_irq(&hp_sdc.rtq_lock);
- hp_sdc_status_out8(postcmd);
- goto finish;
- }
- hp_sdc_status_out8(postcmd);
- goto actdone;
- }
- actdone:
- if (act & HP_SDC_ACT_SEMAPHORE) {
- up(curr->act.semaphore);
- }
- else if (act & HP_SDC_ACT_CALLBACK) {
- curr->act.irqhook(0,0,0,0);
- }
- if (curr->idx >= curr->endidx) { /* This transaction is over. */
- if (act & HP_SDC_ACT_DEALLOC) kfree(curr);
- hp_sdc.tq[curridx] = NULL;
- }
- else {
- curr->actidx = idx + 1;
- curr->idx = idx + 2;
- }
- /* Interleave outbound data between the transactions. */
- hp_sdc.wcurr++;
- if (hp_sdc.wcurr >= HP_SDC_QUEUE_LEN) hp_sdc.wcurr = 0;
- finish:
- /* If by some quirk IBF has cleared and our ISR has run to
- see that that has happened, do it all again. */
- if (!hp_sdc.ibf && limit++ < 20) goto anew;
- done:
- if (hp_sdc.wcurr >= 0) tasklet_schedule(&hp_sdc.task);
- write_unlock(&hp_sdc.lock);
- return 0;
- }
- /******* Functions called in either user or kernel context ****/
- int hp_sdc_enqueue_transaction(hp_sdc_transaction *this) {
- int i;
- if (this == NULL) {
- tasklet_schedule(&hp_sdc.task);
- return -EINVAL;
- };
- write_lock_bh(&hp_sdc.lock);
- /* Can't have same transaction on queue twice */
- for (i=0; i < HP_SDC_QUEUE_LEN; i++)
- if (hp_sdc.tq[i] == this) goto fail;
- this->actidx = 0;
- this->idx = 1;
- /* Search for empty slot */
- for (i=0; i < HP_SDC_QUEUE_LEN; i++) {
- if (hp_sdc.tq[i] == NULL) {
- hp_sdc.tq[i] = this;
- tasklet_schedule(&hp_sdc.task);
- write_unlock_bh(&hp_sdc.lock);
- return 0;
- }
- }
- write_unlock_bh(&hp_sdc.lock);
- printk(KERN_WARNING PREFIX "No free slot to add transaction.n");
- return -EBUSY;
- fail:
- write_unlock_bh(&hp_sdc.lock);
- printk(KERN_WARNING PREFIX "Transaction add failed: transaction already queued?n");
- return -EINVAL;
- }
- int hp_sdc_dequeue_transaction(hp_sdc_transaction *this) {
- int i;
- write_lock_bh(&hp_sdc.lock);
- /* TODO: don't remove it if it's not done. */
- for (i=0; i < HP_SDC_QUEUE_LEN; i++)
- if (hp_sdc.tq[i] == this) hp_sdc.tq[i] = NULL;
- write_unlock_bh(&hp_sdc.lock);
- return 0;
- }
- /********************** User context functions **************************/
- int hp_sdc_request_timer_irq(hp_sdc_irqhook *callback) {
- MOD_INC_USE_COUNT;
- if (callback == NULL || hp_sdc.dev == NULL) {
- MOD_DEC_USE_COUNT;
- return -EINVAL;
- }
- write_lock_irq(&hp_sdc.hook_lock);
- if (hp_sdc.timer != NULL) {
- write_unlock_irq(&hp_sdc.hook_lock);
- MOD_DEC_USE_COUNT;
- return -EBUSY;
- }
- hp_sdc.timer = callback;
- /* Enable interrupts from the timers */
- hp_sdc.im &= ~HP_SDC_IM_FH;
- hp_sdc.im &= ~HP_SDC_IM_PT;
- hp_sdc.im &= ~HP_SDC_IM_TIMERS;
- hp_sdc.set_im = 1;
- write_unlock_irq(&hp_sdc.hook_lock);
- tasklet_schedule(&hp_sdc.task);
- return 0;
- }
- int hp_sdc_request_hil_irq(hp_sdc_irqhook *callback) {
- MOD_INC_USE_COUNT;
- if (callback == NULL || hp_sdc.dev == NULL) {
- MOD_DEC_USE_COUNT;
- return -EINVAL;
- }
- write_lock_irq(&hp_sdc.hook_lock);
- if (hp_sdc.hil != NULL) {
- write_unlock_irq(&hp_sdc.hook_lock);
- MOD_DEC_USE_COUNT;
- return -EBUSY;
- }
- hp_sdc.hil = callback;
- hp_sdc.im &= ~HP_SDC_IM_HIL;
- hp_sdc.set_im = 1;
- write_unlock_irq(&hp_sdc.hook_lock);
- tasklet_schedule(&hp_sdc.task);
- return 0;
- }
- int hp_sdc_request_cooked_irq(hp_sdc_irqhook *callback) {
- MOD_INC_USE_COUNT;
- if (callback == NULL || hp_sdc.dev == NULL) {
- MOD_DEC_USE_COUNT;
- return -EINVAL;
- }
- write_lock_irq(&hp_sdc.hook_lock);
- if (hp_sdc.cooked != NULL) {
- write_unlock_irq(&hp_sdc.hook_lock);
- MOD_DEC_USE_COUNT;
- return -EBUSY;
- }
- /* Enable interrupts from the HIL MLC */
- hp_sdc.cooked = callback;
- hp_sdc.im &= ~HP_SDC_IM_HIL;
- hp_sdc.set_im = 1;
- write_unlock_irq(&hp_sdc.hook_lock);
- tasklet_schedule(&hp_sdc.task);
- return 0;
- }
- int hp_sdc_release_timer_irq(hp_sdc_irqhook *callback) {
- write_lock_irq(&hp_sdc.hook_lock);
- if ((callback != hp_sdc.timer) ||
- (hp_sdc.timer == NULL)) {
- write_unlock_irq(&hp_sdc.hook_lock);
- return -EINVAL;
- }
- /* Disable interrupts from the timers */
- hp_sdc.timer = NULL;
- hp_sdc.im |= HP_SDC_IM_TIMERS;
- hp_sdc.im |= HP_SDC_IM_FH;
- hp_sdc.im |= HP_SDC_IM_PT;
- hp_sdc.set_im = 1;
- write_unlock_irq(&hp_sdc.hook_lock);
- tasklet_schedule(&hp_sdc.task);
- MOD_DEC_USE_COUNT;
- return 0;
- }
- int hp_sdc_release_hil_irq(hp_sdc_irqhook *callback) {
- write_lock_irq(&hp_sdc.hook_lock);
- if ((callback != hp_sdc.hil) ||
- (hp_sdc.hil == NULL)) {
- write_unlock_irq(&hp_sdc.hook_lock);
- return -EINVAL;
- }
- hp_sdc.hil = NULL;
- /* Disable interrupts from HIL only if there is no cooked driver. */
- if(hp_sdc.cooked == NULL) {
- hp_sdc.im |= HP_SDC_IM_HIL;
- hp_sdc.set_im = 1;
- }
- write_unlock_irq(&hp_sdc.hook_lock);
- tasklet_schedule(&hp_sdc.task);
- MOD_DEC_USE_COUNT;
- return 0;
- }
- int hp_sdc_release_cooked_irq(hp_sdc_irqhook *callback) {
- write_lock_irq(&hp_sdc.hook_lock);
- if ((callback != hp_sdc.cooked) ||
- (hp_sdc.cooked == NULL)) {
- write_unlock_irq(&hp_sdc.hook_lock);
- return -EINVAL;
- }
- hp_sdc.cooked = NULL;
- /* Disable interrupts from HIL only if there is no raw HIL driver. */
- if(hp_sdc.hil == NULL) {
- hp_sdc.im |= HP_SDC_IM_HIL;
- hp_sdc.set_im = 1;
- }
- write_unlock_irq(&hp_sdc.hook_lock);
- tasklet_schedule(&hp_sdc.task);
- MOD_DEC_USE_COUNT;
- return 0;
- }
- /************************* Keepalive timer task *********************/
- void hp_sdc_kicker (unsigned long data) {
- tasklet_schedule(&hp_sdc.task);
- /* Re-insert the periodic task. */
- mod_timer(&hp_sdc.kicker, jiffies + HZ);
- }
- /************************** Module Initialization ***************************/
- static struct parisc_device_id hp_sdc_tbl[] = {
- {
- hw_type: HPHW_FIO,
- hversion_rev: HVERSION_REV_ANY_ID,
- hversion: HVERSION_ANY_ID,
- sversion: 0x73,
- },
- { 0, }
- };
- MODULE_DEVICE_TABLE(parisc, hp_sdc_tbl);
- static int __init hp_sdc_init(struct parisc_device *d);
- static struct parisc_driver hp_sdc_driver = {
- name: "HP SDC",
- id_table: hp_sdc_tbl,
- probe: hp_sdc_init,
- };
- static int __init hp_sdc_init(struct parisc_device *d)
- {
- int i;
- char *errstr = NULL;
- hp_sdc_transaction t_sync;
- uint8_t ts_sync[6];
- struct semaphore s_sync;
- errstr = "foon";
- if (!d) return 1;
- if (hp_sdc.dev != NULL) return 1; /* We only expect one SDC */
- hp_sdc.dev = d;
- hp_sdc.irq = d->irq;
- /* TODO: Is NMI == IRQ - 1 all cases, or is there a way to query? */
- hp_sdc.nmi = d->irq - 1;
- hp_sdc.base_io = (unsigned long) d->hpa;
- hp_sdc.data_io = (unsigned long) d->hpa + 0x800;
- hp_sdc.status_io = (unsigned long) d->hpa + 0x801;
- hp_sdc.lock = RW_LOCK_UNLOCKED;
- hp_sdc.ibf_lock = RW_LOCK_UNLOCKED;
- hp_sdc.rtq_lock = RW_LOCK_UNLOCKED;
- hp_sdc.hook_lock = RW_LOCK_UNLOCKED;
- hp_sdc.timer = NULL;
- hp_sdc.hil = NULL;
- hp_sdc.pup = NULL;
- hp_sdc.cooked = NULL;
- hp_sdc.im = HP_SDC_IM_MASK; /* Mask maskable irqs */
- hp_sdc.set_im = 1;
- hp_sdc.wi = 0xff;
- hp_sdc.r7[0] = 0xff;
- hp_sdc.r7[1] = 0xff;
- hp_sdc.r7[2] = 0xff;
- hp_sdc.r7[3] = 0xff;
- hp_sdc.ibf = 1;
- for (i = 0; i < HP_SDC_QUEUE_LEN; i++) hp_sdc.tq[i] = NULL;
- hp_sdc.wcurr = -1;
- hp_sdc.rcurr = -1;
- hp_sdc.rqty = 0;
- hp_sdc.dev_err = -ENODEV;
- errstr = "IO not found for";
- if (!hp_sdc.base_io) goto err0;
- errstr = "IRQ not found for";
- if (!hp_sdc.irq) goto err0;
- hp_sdc.dev_err = -EBUSY;
- errstr = "IO not available for";
- if (request_region(hp_sdc.data_io, 2, hp_sdc_driver.name)) goto err0;
- errstr = "IRQ not available for";
- if(request_irq(hp_sdc.irq, &hp_sdc_isr, 0, hp_sdc_driver.name,
- (void *) hp_sdc.base_io)) goto err1;
- errstr = "NMI not available for";
- if (request_irq(hp_sdc.nmi, &hp_sdc_nmisr, 0, "HP SDC NMI",
- (void*)d->hpa)) goto err2;
- printk(KERN_INFO PREFIX "HP SDC at 0x%p, IRQ %d (NMI IRQ %d)n",
- (void *)hp_sdc.base_io, hp_sdc.irq, hp_sdc.nmi);
- hp_sdc_status_in8();
- hp_sdc_data_in8();
- tasklet_init(&hp_sdc.task, hp_sdc_tasklet, 0);
- /* Sync the output buffer registers, thus scheduling hp_sdc_tasklet. */
- t_sync.actidx = 0;
- t_sync.idx = 1;
- t_sync.endidx = 6;
- t_sync.seq = ts_sync;
- ts_sync[0] = HP_SDC_ACT_DATAREG | HP_SDC_ACT_SEMAPHORE;
- ts_sync[1] = 0x0f;
- ts_sync[2] = ts_sync[3] = ts_sync[4] = ts_sync[5] = 0;
- t_sync.act.semaphore = &s_sync;
- init_MUTEX_LOCKED(&s_sync);
- hp_sdc_enqueue_transaction(&t_sync);
- down(&s_sync); /* Wait for t_sync to complete */
- /* Create the keepalive task */
- init_timer(&hp_sdc.kicker);
- hp_sdc.kicker.expires = jiffies + HZ;
- hp_sdc.kicker.function = &hp_sdc_kicker;
- add_timer(&hp_sdc.kicker);
- hp_sdc.dev_err = 0;
- return 0;
- err2:
- free_irq(hp_sdc.irq, NULL);
- err1:
- release_region(hp_sdc.data_io, 2);
- err0:
- printk(KERN_WARNING PREFIX ": %s SDC IO=0x%p IRQ=0x%x NMI=0x%xn",
- errstr, (void *)hp_sdc.base_io, hp_sdc.irq, hp_sdc.nmi);
- hp_sdc.dev = NULL;
- return hp_sdc.dev_err;
- }
- static void __exit hp_sdc_exit(void)
- {
- write_lock_irq(&hp_sdc.lock);
- /* Turn off all maskable "sub-function" irq's. */
- hp_sdc_spin_ibf();
- gsc_writeb(HP_SDC_CMD_SET_IM | HP_SDC_IM_MASK, hp_sdc.status_io);
- /* Wait until we know this has been processed by the i8042 */
- hp_sdc_spin_ibf();
- free_irq(hp_sdc.nmi, NULL);
- free_irq(hp_sdc.irq, NULL);
- write_unlock_irq(&hp_sdc.lock);
- del_timer(&hp_sdc.kicker);
- tasklet_kill(&hp_sdc.task);
- /* release_region(hp_sdc.data_io, 2); */
- if (unregister_parisc_driver(&hp_sdc_driver))
- printk(KERN_WARNING PREFIX "Error unregistering HP SDC");
- }
- static int __init hp_sdc_register(void)
- {
- hp_sdc.dev = NULL;
- hp_sdc.dev_err = 0;
- hp_sdc_transaction tq_init;
- uint8_t tq_init_seq[5];
- struct semaphore tq_init_sem;
- if (register_parisc_driver(&hp_sdc_driver)) {
- printk(KERN_WARNING PREFIX "Error registering SDC with system bus tree.n");
- return -ENODEV;
- }
- if (hp_sdc.dev == NULL) {
- printk(KERN_WARNING PREFIX "No SDC found.n");
- return hp_sdc.dev_err;
- }
- init_MUTEX_LOCKED(&tq_init_sem);
- tq_init.actidx = 0;
- tq_init.idx = 1;
- tq_init.endidx = 5;
- tq_init.seq = tq_init_seq;
- tq_init.act.semaphore = &tq_init_sem;
- tq_init_seq[0] =
- HP_SDC_ACT_POSTCMD | HP_SDC_ACT_DATAIN | HP_SDC_ACT_SEMAPHORE;
- tq_init_seq[1] = HP_SDC_CMD_READ_KCC;
- tq_init_seq[2] = 1;
- tq_init_seq[3] = 0;
- tq_init_seq[4] = 0;
- hp_sdc_enqueue_transaction(&tq_init);
- down(&tq_init_sem);
- up(&tq_init_sem);
- if ((tq_init_seq[0] & HP_SDC_ACT_DEAD) == HP_SDC_ACT_DEAD) {
- printk(KERN_WARNING PREFIX "Error reading config byte.n");
- hp_sdc_exit();
- return -ENODEV;
- }
- hp_sdc.r11 = tq_init_seq[4];
- if (hp_sdc.r11 & HP_SDC_CFG_NEW) {
- char *str;
- printk(KERN_INFO PREFIX "New style SDCn");
- tq_init_seq[1] = HP_SDC_CMD_READ_XTD;
- tq_init.actidx = 0;
- tq_init.idx = 1;
- down(&tq_init_sem);
- hp_sdc_enqueue_transaction(&tq_init);
- down(&tq_init_sem);
- up(&tq_init_sem);
- if ((tq_init_seq[0] & HP_SDC_ACT_DEAD) == HP_SDC_ACT_DEAD) {
- printk(KERN_WARNING PREFIX "Error reading extended config byte.n");
- return -ENODEV;
- }
- hp_sdc.r7e = tq_init_seq[4];
- HP_SDC_XTD_REV_STRINGS(hp_sdc.r7e & HP_SDC_XTD_REV, str)
- printk(KERN_INFO PREFIX "Revision: %sn", str);
- if (hp_sdc.r7e & HP_SDC_XTD_BEEPER) {
- printk(KERN_INFO PREFIX "TI SN76494 beeper presentn");
- }
- if (hp_sdc.r7e & HP_SDC_XTD_BBRTC) {
- printk(KERN_INFO PREFIX "OKI MSM-58321 BBRTC presentn");
- }
- printk(KERN_INFO PREFIX "Spunking the self test register to force PUP "
- "on next firmware reset.n");
- tq_init_seq[0] = HP_SDC_ACT_PRECMD |
- HP_SDC_ACT_DATAOUT | HP_SDC_ACT_SEMAPHORE;
- tq_init_seq[1] = HP_SDC_CMD_SET_STR;
- tq_init_seq[2] = 1;
- tq_init_seq[3] = 0;
- tq_init.actidx = 0;
- tq_init.idx = 1;
- tq_init.endidx = 4;
- down(&tq_init_sem);
- hp_sdc_enqueue_transaction(&tq_init);
- down(&tq_init_sem);
- up(&tq_init_sem);
- }
- else {
- printk(KERN_INFO PREFIX "Old style SDC (1820-%s).n",
- (hp_sdc.r11 & HP_SDC_CFG_REV) ? "3300" : "2564/3087");
- }
- return 0;
- }
- module_init(hp_sdc_register);
- module_exit(hp_sdc_exit);
- /* Timing notes: These measurements taken on my 64MHz 7100-LC (715/64)
- * cycles cycles-adj time
- * between two consecutive mfctl(16)'s: 4 n/a 63ns
- * hp_sdc_spin_ibf when idle: 119 115 1.7us
- * gsc_writeb status register: 83 79 1.2us
- * IBF to clear after sending SET_IM: 6204 6006 93us
- * IBF to clear after sending LOAD_RT: 4467 4352 68us
- * IBF to clear after sending two LOAD_RTs: 18974 18859 295us
- * READ_T1, read status/data, IRQ, call handler: 35564 n/a 556us
- * cmd to ~IBF READ_T1 2nd time right after: 5158403 n/a 81ms
- * between IRQ received and ~IBF for above: 2578877 n/a 40ms
- *
- * Performance stats after a run of this module configuring HIL and
- * receiving a few mouse events:
- *
- * status in8 282508 cycles 7128 calls
- * status out8 8404 cycles 341 calls
- * data out8 1734 cycles 78 calls
- * isr 174324 cycles 617 calls (includes take)
- * take 1241 cycles 2 calls
- * put 1411504 cycles 6937 calls
- * task 1655209 cycles 6937 calls (includes put)
- *
- */