/* * Access to HP-HIL MLC through HP System Device Controller. * * 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 * System Device Controller Microprocessor Firmware Theory of Operation * for Part Number 1820-4784 Revision B. Dwg No. A-1820-4784-2 * */ #include <linux/hil_mlc.h> #include <linux/hp_sdc.h> #include <linux/errno.h> #include <linux/kernel.h> #include <linux/module.h> #include <linux/init.h> #include <linux/string.h> #include <asm/semaphore.h> #define PREFIX "HP SDC MLC: " static hil_mlc hp_sdc_mlc; MODULE_AUTHOR("Brian S. Julin <bri@calyx.com>"); MODULE_DESCRIPTION("Glue for onboard HIL MLC in HP-PARISC machines"); MODULE_LICENSE("Dual BSD/GPL"); struct hp_sdc_mlc_priv_s { int emtestmode; hp_sdc_transaction trans; u8 tseq[16]; int got5x; } hp_sdc_mlc_priv; /************************* Interrupt context ******************************/ static void hp_sdc_mlc_isr (int irq, void *dev_id, uint8_t status, uint8_t data) { int idx; hil_mlc *mlc = &hp_sdc_mlc; write_lock(&(mlc->lock)); if (mlc->icount < 0) { printk(KERN_WARNING PREFIX "HIL Overflow!\n"); up(&mlc->isem); goto out; } idx = 15 - mlc->icount; if ((status & HP_SDC_STATUS_IRQMASK) == HP_SDC_STATUS_HILDATA) { mlc->ipacket[idx] |= data | HIL_ERR_INT; mlc->icount--; if (hp_sdc_mlc_priv.got5x) goto check; if (!idx) goto check; if ((mlc->ipacket[idx-1] & HIL_PKT_ADDR_MASK) != (mlc->ipacket[idx] & HIL_PKT_ADDR_MASK)) { mlc->ipacket[idx] &= ~HIL_PKT_ADDR_MASK; mlc->ipacket[idx] |= (mlc->ipacket[idx-1] & HIL_PKT_ADDR_MASK); } goto check; } /* We know status is 5X */ if (data & HP_SDC_HIL_ISERR) goto err; mlc->ipacket[idx] = (data & HP_SDC_HIL_R1MASK) << HIL_PKT_ADDR_SHIFT; hp_sdc_mlc_priv.got5x = 1; goto out; check: hp_sdc_mlc_priv.got5x = 0; if (mlc->imatch == 0) goto done; if ((mlc->imatch == (HIL_ERR_INT | HIL_PKT_CMD | HIL_CMD_POL)) && (mlc->ipacket[idx] == (mlc->imatch | idx))) goto done; if (mlc->ipacket[idx] == mlc->imatch) goto done; goto out; err: printk(KERN_DEBUG PREFIX "err code %x\n", data); switch (data) { case HP_SDC_HIL_RC_DONE: printk(KERN_WARNING PREFIX "Bastard SDC reconfigured loop!\n"); break; case HP_SDC_HIL_ERR: mlc->ipacket[idx] |= HIL_ERR_INT | HIL_ERR_PERR | HIL_ERR_FERR | HIL_ERR_FOF; break; case HP_SDC_HIL_TO: mlc->ipacket[idx] |= HIL_ERR_INT | HIL_ERR_LERR; break; case HP_SDC_HIL_RC: printk(KERN_WARNING PREFIX "Bastard SDC decided to reconfigure loop!\n"); break; default: printk(KERN_WARNING PREFIX "Unkown HIL Error status (%x)!\n", data); break; } /* No more data will be coming due to an error. */ done: tasklet_schedule(mlc->tasklet); up(&(mlc->isem)); out: write_unlock(&(mlc->lock)); } /******************** Tasklet or userspace context functions ****************/ static int hp_sdc_mlc_in (hil_mlc *mlc, suseconds_t timeout) { unsigned long flags; struct hp_sdc_mlc_priv_s *priv; int rc = 2; priv = mlc->priv; write_lock_irqsave(&(mlc->lock), flags); /* Try to down the semaphore */ if (down_trylock(&(mlc->isem))) { struct timeval tv; if (priv->emtestmode) { mlc->ipacket[0] = HIL_ERR_INT | (mlc->opacket & (HIL_PKT_CMD | HIL_PKT_ADDR_MASK | HIL_PKT_DATA_MASK)); mlc->icount = 14; /* printk(KERN_DEBUG PREFIX ">[%x]\n", mlc->ipacket[0]); */ goto wasup; } do_gettimeofday(&tv); tv.tv_usec += 1000000 * (tv.tv_sec - mlc->instart.tv_sec); if (tv.tv_usec - mlc->instart.tv_usec > mlc->intimeout) { /* printk("!%i %i", tv.tv_usec - mlc->instart.tv_usec, mlc->intimeout); */ rc = 1; up(&(mlc->isem)); } goto done; } wasup: up(&(mlc->isem)); rc = 0; goto done; done: write_unlock_irqrestore(&(mlc->lock), flags); return rc; } static int hp_sdc_mlc_cts (hil_mlc *mlc) { struct hp_sdc_mlc_priv_s *priv; unsigned long flags; priv = mlc->priv; write_lock_irqsave(&(mlc->lock), flags); /* Try to down the semaphores -- they should be up. */ if (down_trylock(&(mlc->isem))) { BUG(); goto busy; } if (down_trylock(&(mlc->osem))) { BUG(); up(&(mlc->isem)); goto busy; } up(&(mlc->isem)); up(&(mlc->osem)); if (down_trylock(&(mlc->csem))) { if (priv->trans.act.semaphore != &(mlc->csem)) goto poll; goto busy; } if (!(priv->tseq[4] & HP_SDC_USE_LOOP)) goto done; poll: priv->trans.act.semaphore = &(mlc->csem); priv->trans.actidx = 0; priv->trans.idx = 1; priv->trans.endidx = 5; priv->tseq[0] = HP_SDC_ACT_POSTCMD | HP_SDC_ACT_DATAIN | HP_SDC_ACT_SEMAPHORE; priv->tseq[1] = HP_SDC_CMD_READ_USE; priv->tseq[2] = 1; priv->tseq[3] = 0; priv->tseq[4] = 0; hp_sdc_enqueue_transaction(&(priv->trans)); busy: write_unlock_irqrestore(&(mlc->lock), flags); return 1; done: priv->trans.act.semaphore = &(mlc->osem); up(&(mlc->csem)); write_unlock_irqrestore(&(mlc->lock), flags); return 0; } static void hp_sdc_mlc_out (hil_mlc *mlc) { struct hp_sdc_mlc_priv_s *priv; unsigned long flags; priv = mlc->priv; write_lock_irqsave(&(mlc->lock), flags); /* Try to down the semaphore -- it should be up. */ if (down_trylock(&(mlc->osem))) { BUG(); goto done; } if (mlc->opacket & HIL_DO_ALTER_CTRL) goto do_control; do_data: if (priv->emtestmode) { up(&(mlc->osem)); goto done; } /* Shouldn't be sending commands when loop may be busy */ if (down_trylock(&(mlc->csem))) { BUG(); goto done; } up(&(mlc->csem)); priv->trans.actidx = 0; priv->trans.idx = 1; priv->trans.act.semaphore = &(mlc->osem); priv->trans.endidx = 6; priv->tseq[0] = HP_SDC_ACT_DATAREG | HP_SDC_ACT_POSTCMD | HP_SDC_ACT_SEMAPHORE; priv->tseq[1] = 0x7; priv->tseq[2] = (mlc->opacket & (HIL_PKT_ADDR_MASK | HIL_PKT_CMD)) >> HIL_PKT_ADDR_SHIFT; priv->tseq[3] = (mlc->opacket & HIL_PKT_DATA_MASK) >> HIL_PKT_DATA_SHIFT; priv->tseq[4] = 0; /* No timeout */ if (priv->tseq[3] == HIL_CMD_DHR) priv->tseq[4] = 1; priv->tseq[5] = HP_SDC_CMD_DO_HIL; goto enqueue; do_control: priv->emtestmode = mlc->opacket & HIL_CTRL_TEST; if ((mlc->opacket & (HIL_CTRL_APE | HIL_CTRL_IPF)) == HIL_CTRL_APE) { BUG(); /* we cannot emulate this, it should not be used. */ } if ((mlc->opacket & HIL_CTRL_ONLY) == HIL_CTRL_ONLY) goto control_only; if (mlc->opacket & HIL_CTRL_APE) { BUG(); /* Should not send command/data after engaging APE */ goto done; } /* Disengaging APE this way would not be valid either since * the loop must be allowed to idle. * * So, it works out that we really never actually send control * and data when using SDC, we just send the data. */ goto do_data; control_only: priv->trans.actidx = 0; priv->trans.idx = 1; priv->trans.act.semaphore = &(mlc->osem); priv->trans.endidx = 4; priv->tseq[0] = HP_SDC_ACT_PRECMD | HP_SDC_ACT_DATAOUT | HP_SDC_ACT_SEMAPHORE; priv->tseq[1] = HP_SDC_CMD_SET_LPC; priv->tseq[2] = 1; // priv->tseq[3] = (mlc->ddc + 1) | HP_SDC_LPS_ACSUCC; priv->tseq[3] = 0; if (mlc->opacket & HIL_CTRL_APE) { priv->tseq[3] |= HP_SDC_LPC_APE_IPF; down_trylock(&(mlc->csem)); } enqueue: hp_sdc_enqueue_transaction(&(priv->trans)); done: write_unlock_irqrestore(&(mlc->lock), flags); } static int __init hp_sdc_mlc_init(void) { hil_mlc *mlc = &hp_sdc_mlc; printk(KERN_INFO PREFIX "Registering the System Domain Controller's HIL MLC.\n"); hp_sdc_mlc_priv.emtestmode = 0; hp_sdc_mlc_priv.trans.seq = hp_sdc_mlc_priv.tseq; hp_sdc_mlc_priv.trans.act.semaphore = &(mlc->osem); hp_sdc_mlc_priv.got5x = 0; mlc->cts = &hp_sdc_mlc_cts; mlc->in = &hp_sdc_mlc_in; mlc->out = &hp_sdc_mlc_out; if (hil_mlc_register(mlc)) { printk(KERN_WARNING PREFIX "Failed to register MLC structure with hil_mlc\n"); goto err0; } mlc->priv = &hp_sdc_mlc_priv; if (hp_sdc_request_hil_irq(&hp_sdc_mlc_isr)) { printk(KERN_WARNING PREFIX "Request for raw HIL ISR hook denied\n"); goto err1; } return 0; err1: if (hil_mlc_unregister(mlc)) { printk(KERN_ERR PREFIX "Failed to unregister MLC structure with hil_mlc.\n" "This is bad. Could cause an oops.\n"); } err0: return -EBUSY; } static void __exit hp_sdc_mlc_exit(void) { hil_mlc *mlc = &hp_sdc_mlc; if (hp_sdc_release_hil_irq(&hp_sdc_mlc_isr)) { printk(KERN_ERR PREFIX "Failed to release the raw HIL ISR hook.\n" "This is bad. Could cause an oops.\n"); } if (hil_mlc_unregister(mlc)) { printk(KERN_ERR PREFIX "Failed to unregister MLC structure with hil_mlc.\n" "This is bad. Could cause an oops.\n"); } } module_init(hp_sdc_mlc_init); module_exit(hp_sdc_mlc_exit);