/*- * Copyright (c) 1997, 1998, 1999 Nicolas Souchu, Michael Smith * 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. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * * 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 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF * SUCH DAMAGE. * * $FreeBSD: src/sys/dev/ppbus/ppi.c,v 1.21.2.3 2000/08/07 18:24:43 peter Exp $ * */ #include "opt_ppb_1284.h" #include #include #include #include #include #include #include #include #include #include #include #include #include #ifdef PERIPH_1284 #include #endif #include "ppi.h" #include "ppbus_if.h" #include #define BUFSIZE 512 struct ppi_data { int ppi_unit; int ppi_flags; #define HAVE_PPBUS (1<<0) #define HAD_PPBUS (1<<1) int ppi_count; int ppi_mode; /* IEEE1284 mode */ char ppi_buffer[BUFSIZE]; #ifdef PERIPH_1284 struct resource *intr_resource; /* interrupt resource */ void *intr_cookie; /* interrupt registration cookie */ #endif /* PERIPH_1284 */ }; #define DEVTOSOFTC(dev) \ ((struct ppi_data *)device_get_softc(dev)) #define UNITOSOFTC(unit) \ ((struct ppi_data *)devclass_get_softc(ppi_devclass, (unit))) #define UNITODEVICE(unit) \ (devclass_get_device(ppi_devclass, (unit))) static devclass_t ppi_devclass; static d_open_t ppiopen; static d_close_t ppiclose; static d_ioctl_t ppiioctl; static d_write_t ppiwrite; static d_read_t ppiread; static struct dev_ops ppi_ops = { { "ppi", 0, 0 }, .d_open = ppiopen, .d_close = ppiclose, .d_read = ppiread, .d_write = ppiwrite, .d_ioctl = ppiioctl, }; #ifdef PERIPH_1284 static void ppi_enable_intr(device_t ppidev) { char r; device_t ppbus = device_get_parent(ppidev); r = ppb_rctr(ppbus); ppb_wctr(ppbus, r | IRQENABLE); return; } static void ppi_disable_intr(device_t ppidev) { char r; device_t ppbus = device_get_parent(ppidev); r = ppb_rctr(ppbus); ppb_wctr(ppbus, r & ~IRQENABLE); return; } #endif /* PERIPH_1284 */ /* * ppi_probe() */ static int ppi_probe(device_t dev) { struct ppi_data *ppi; /* probe is always ok */ device_set_desc(dev, "Parallel I/O"); ppi = DEVTOSOFTC(dev); bzero(ppi, sizeof(struct ppi_data)); return (0); } /* * ppi_attach() */ static int ppi_attach(device_t dev) { #ifdef PERIPH_1284 uintptr_t irq; int zero = 0; struct ppi_data *ppi = DEVTOSOFTC(dev); /* retrive the irq */ BUS_READ_IVAR(device_get_parent(dev), dev, PPBUS_IVAR_IRQ, &irq); /* declare our interrupt handler */ ppi->intr_resource = bus_alloc_legacy_irq_resource(dev, &zero, irq, RF_ACTIVE); #endif /* PERIPH_1284 */ make_dev(&ppi_ops, device_get_unit(dev), /* XXX cleanup */ UID_ROOT, GID_WHEEL, 0600, "ppi%d", device_get_unit(dev)); return (0); } #ifdef PERIPH_1284 /* * Cable * ----- * * Use an IEEE1284 compliant (DB25/DB25) cable with the following tricks: * * nStrobe <-> nAck 1 <-> 10 * nAutofd <-> Busy 11 <-> 14 * nSelectin <-> Select 17 <-> 13 * nInit <-> nFault 15 <-> 16 * */ static void ppiintr(void *arg) { device_t ppidev = (device_t)arg; device_t ppbus = device_get_parent(ppidev); struct ppi_data *ppi = DEVTOSOFTC(ppidev); ppi_disable_intr(ppidev); switch (ppb_1284_get_state(ppbus)) { /* accept IEEE1284 negotiation then wakeup an waiting process to * continue negotiation at process level */ case PPB_FORWARD_IDLE: /* Event 1 */ if ((ppb_rstr(ppbus) & (SELECT | nBUSY)) == (SELECT | nBUSY)) { /* IEEE1284 negotiation */ #ifdef DEBUG_1284 kprintf("N"); #endif /* Event 2 - prepare for reading the ext. value */ ppb_wctr(ppbus, (PCD | STROBE | nINIT) & ~SELECTIN); ppb_1284_set_state(ppbus, PPB_NEGOTIATION); } else { #ifdef DEBUG_1284 kprintf("0x%x", ppb_rstr(ppbus)); #endif ppb_peripheral_terminate(ppbus, PPB_DONTWAIT); break; } /* wake up any process waiting for negotiation from * remote master host */ /* XXX should set a variable to warn the process about * the interrupt */ wakeup(ppi); break; default: #ifdef DEBUG_1284 kprintf("?%d", ppb_1284_get_state(ppbus)); #endif ppb_1284_set_state(ppbus, PPB_FORWARD_IDLE); ppb_set_mode(ppbus, PPB_COMPATIBLE); break; } ppi_enable_intr(ppidev); return; } #endif /* PERIPH_1284 */ static int ppiopen(struct dev_open_args *ap) { cdev_t dev = ap->a_head.a_dev; u_int unit = minor(dev); struct ppi_data *ppi = UNITOSOFTC(unit); device_t ppidev = UNITODEVICE(unit); device_t ppbus = device_get_parent(ppidev); int res; if (!ppi) return (ENXIO); if (!(ppi->ppi_flags & HAVE_PPBUS)) { if ((res = ppb_request_bus(ppbus, ppidev, (ap->a_oflags & O_NONBLOCK) ? PPB_DONTWAIT : (PPB_WAIT | PPB_INTR)))) return (res); ppi->ppi_flags |= HAVE_PPBUS; #ifdef PERIPH_1284 if (ppi->intr_resource) { /* register our interrupt handler */ BUS_SETUP_INTR(device_get_parent(ppidev), ppidev, ppi->intr_resource, 0, ppiintr, dev, &ppi->intr_cookie, NULL, NULL); } #endif /* PERIPH_1284 */ } ppi->ppi_count += 1; return (0); } static int ppiclose(struct dev_close_args *ap) { cdev_t dev = ap->a_head.a_dev; u_int unit = minor(dev); struct ppi_data *ppi = UNITOSOFTC(unit); device_t ppidev = UNITODEVICE(unit); device_t ppbus = device_get_parent(ppidev); ppi->ppi_count --; if (!ppi->ppi_count) { #ifdef PERIPH_1284 switch (ppb_1284_get_state(ppbus)) { case PPB_PERIPHERAL_IDLE: ppb_peripheral_terminate(ppbus, 0); break; case PPB_REVERSE_IDLE: case PPB_EPP_IDLE: case PPB_ECP_FORWARD_IDLE: default: ppb_1284_terminate(ppbus); break; } #endif /* PERIPH_1284 */ /* unregistration of interrupt forced by release */ ppb_release_bus(ppbus, ppidev); ppi->ppi_flags &= ~HAVE_PPBUS; } return (0); } /* * ppiread() * * IEEE1284 compliant read. * * First, try negotiation to BYTE then NIBBLE mode * If no data is available, wait for it otherwise transfer as much as possible */ static int ppiread(struct dev_read_args *ap) { #ifdef PERIPH_1284 cdev_t dev = ap->a_head.a_dev; struct uio *uio = ap->a_uio; u_int unit = minor(dev); struct ppi_data *ppi = UNITOSOFTC(unit); device_t ppidev = UNITODEVICE(unit); device_t ppbus = device_get_parent(ppidev); int len, error = 0; switch (ppb_1284_get_state(ppbus)) { case PPB_PERIPHERAL_IDLE: ppb_peripheral_terminate(ppbus, 0); /* fall throught */ case PPB_FORWARD_IDLE: /* if can't negotiate NIBBLE mode then try BYTE mode, * the peripheral may be a computer */ if ((ppb_1284_negotiate(ppbus, ppi->ppi_mode = PPB_NIBBLE, 0))) { /* XXX Wait 2 seconds to let the remote host some * time to terminate its interrupt */ tsleep(ppi, 0, "ppiread", 2*hz); if ((error = ppb_1284_negotiate(ppbus, ppi->ppi_mode = PPB_BYTE, 0))) return (error); } break; case PPB_REVERSE_IDLE: case PPB_EPP_IDLE: case PPB_ECP_FORWARD_IDLE: default: break; } #ifdef DEBUG_1284 kprintf("N"); #endif /* read data */ len = 0; while (uio->uio_resid) { error = ppb_1284_read(ppbus, ppi->ppi_mode, ppi->ppi_buffer, (int)szmin(BUFSIZE, uio->uio_resid), &len); if (error) goto error; if (!len) goto error; /* no more data */ #ifdef DEBUG_1284 kprintf("d"); #endif if ((error = uiomove(ppi->ppi_buffer, (size_t)len, uio))) goto error; } error: #else /* PERIPH_1284 */ int error = ENODEV; #endif return (error); } /* * ppiwrite() * * IEEE1284 compliant write * * Actually, this is the peripheral side of a remote IEEE1284 read * * The first part of the negotiation (IEEE1284 device detection) is * done at interrupt level, then the remaining is done by the writing * process * * Once negotiation done, transfer data */ static int ppiwrite(struct dev_write_args *ap) { #ifdef PERIPH_1284 cdev_t dev = ap->a_head.a_dev; struct uio *uio = ap->a_uio; u_int unit = minor(dev); struct ppi_data *ppi = UNITOSOFTC(unit); device_t ppidev = UNITODEVICE(unit); device_t ppbus = device_get_parent(ppidev); int len, error = 0, sent; #if 0 int ret; #define ADDRESS MS_PARAM(0, 0, MS_TYP_PTR) #define LENGTH MS_PARAM(0, 1, MS_TYP_INT) struct ppb_microseq msq[] = { { MS_OP_PUT, { MS_UNKNOWN, MS_UNKNOWN, MS_UNKNOWN } }, MS_RET(0) }; /* negotiate ECP mode */ if (ppb_1284_negotiate(ppbus, PPB_ECP, 0)) { kprintf("ppiwrite: ECP negotiation failed\n"); } while (!error && (len = (int)szmin(uio->uio_resid, BUFSIZE))) { uiomove(ppi->ppi_buffer, (size_t)len, uio); ppb_MS_init_msq(msq, 2, ADDRESS, ppi->ppi_buffer, LENGTH, len); error = ppb_MS_microseq(ppbus, msq, &ret); } #endif /* we have to be peripheral to be able to send data, so * wait for the appropriate state */ if (ppb_1284_get_state(ppbus) < PPB_PERIPHERAL_NEGOTIATION) ppb_1284_terminate(ppbus); while (ppb_1284_get_state(ppbus) != PPB_PERIPHERAL_IDLE) { /* XXX should check a variable before sleeping */ #ifdef DEBUG_1284 kprintf("s"); #endif ppi_enable_intr(ppidev); /* sleep until IEEE1284 negotiation starts */ error = tsleep(ppi, PCATCH, "ppiwrite", 0); switch (error) { case 0: /* negotiate peripheral side with BYTE mode */ ppb_peripheral_negotiate(ppbus, PPB_BYTE, 0); break; case EWOULDBLOCK: break; default: goto error; } } #ifdef DEBUG_1284 kprintf("N"); #endif /* negotiation done, write bytes to master host */ while ((len = (int)szmin(uio->uio_resid, BUFSIZE)) != 0) { uiomove(ppi->ppi_buffer, (size_t)len, uio); if ((error = byte_peripheral_write(ppbus, ppi->ppi_buffer, len, &sent))) goto error; #ifdef DEBUG_1284 kprintf("d"); #endif } error: #else /* PERIPH_1284 */ int error = ENODEV; #endif return (error); } static int ppiioctl(struct dev_ioctl_args *ap) { cdev_t dev = ap->a_head.a_dev; u_int unit = minor(dev); device_t ppidev = UNITODEVICE(unit); device_t ppbus = device_get_parent(ppidev); int error = 0; u_int8_t *val = (u_int8_t *)ap->a_data; switch (ap->a_cmd) { case PPIGDATA: /* get data register */ *val = ppb_rdtr(ppbus); break; case PPIGSTATUS: /* get status bits */ *val = ppb_rstr(ppbus); break; case PPIGCTRL: /* get control bits */ *val = ppb_rctr(ppbus); break; case PPIGEPPD: /* get EPP data bits */ *val = ppb_repp_D(ppbus); break; case PPIGECR: /* get ECP bits */ *val = ppb_recr(ppbus); break; case PPIGFIFO: /* read FIFO */ *val = ppb_rfifo(ppbus); break; case PPISDATA: /* set data register */ ppb_wdtr(ppbus, *val); break; case PPISSTATUS: /* set status bits */ ppb_wstr(ppbus, *val); break; case PPISCTRL: /* set control bits */ ppb_wctr(ppbus, *val); break; case PPISEPPD: /* set EPP data bits */ ppb_wepp_D(ppbus, *val); break; case PPISECR: /* set ECP bits */ ppb_wecr(ppbus, *val); break; case PPISFIFO: /* write FIFO */ ppb_wfifo(ppbus, *val); break; case PPIGEPPA: /* get EPP address bits */ *val = ppb_repp_A(ppbus); break; case PPISEPPA: /* set EPP address bits */ ppb_wepp_A(ppbus, *val); break; default: error = ENOTTY; break; } return (error); } /* * Because ppi is a static device under any attached ppbuf, and not * scanned by the ppbuf, we need an identify function to create the * device. */ static device_method_t ppi_methods[] = { /* device interface */ DEVMETHOD(device_identify, bus_generic_identify), DEVMETHOD(device_probe, ppi_probe), DEVMETHOD(device_attach, ppi_attach), DEVMETHOD_END }; static driver_t ppi_driver = { "ppi", ppi_methods, sizeof(struct ppi_data), }; DRIVER_MODULE(ppi, ppbus, ppi_driver, ppi_devclass, NULL, NULL);