/* $NetBSD: atppc.c,v 1.41 2022/11/01 19:45:35 andvar Exp $ */ /* * Copyright (c) 2001 Alcove - Nicolas Souchu * Copyright (c) 2003, 2004 Gary Thorpe * 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/isa/ppc.c,v 1.26.2.5 2001/10/02 05:21:45 nsouch Exp * */ #include __KERNEL_RCSID(0, "$NetBSD: atppc.c,v 1.41 2022/11/01 19:45:35 andvar Exp $"); #include "opt_atppc.h" #include #include #include #include #include #include #include #include #include #include /*#include */ #include #include #include #include #include #include #include #ifdef ATPPC_DEBUG int atppc_debug = 1; #endif #ifdef ATPPC_VERBOSE int atppc_verbose = 1; #endif /* List of supported chipsets detection routines */ static int (*chipset_detect[])(struct atppc_softc *) = { /* XXX Add these LATER: maybe as separate devices? atppc_pc873xx_detect, atppc_smc37c66xgt_detect, atppc_w83877f_detect, atppc_smc37c935_detect, */ NULL }; /* Prototypes for functions. */ /* Print function for config_found() */ static int atppc_print(void *, const char *); /* Detection routines */ static int atppc_detect_fifo(struct atppc_softc *); static int atppc_detect_chipset(struct atppc_softc *); static int atppc_detect_generic(struct atppc_softc *); /* Routines for ppbus interface (bus + device) */ static int atppc_read(device_t, char *, int, int, size_t *); static int atppc_write(device_t, char *, int, int, size_t *); static int atppc_setmode(device_t, int); static int atppc_getmode(device_t); static int atppc_check_epp_timeout(device_t); static void atppc_reset_epp_timeout(device_t); static void atppc_ecp_sync(device_t); static int atppc_exec_microseq(device_t, struct ppbus_microseq * *); static u_int8_t atppc_io(device_t, int, u_char *, int, u_char); static int atppc_read_ivar(device_t, int, unsigned int *); static int atppc_write_ivar(device_t, int, unsigned int *); static int atppc_add_handler(device_t, void (*)(void *), void *); static int atppc_remove_handler(device_t, void (*)(void *)); /* Utility functions */ /* Functions to read bytes into device's input buffer */ static void atppc_nibble_read(struct atppc_softc * const); static void atppc_byte_read(struct atppc_softc * const); static void atppc_epp_read(struct atppc_softc * const); static void atppc_ecp_read(struct atppc_softc * const); static void atppc_ecp_read_dma(struct atppc_softc *, unsigned int *, unsigned char); static void atppc_ecp_read_pio(struct atppc_softc *, unsigned int *, unsigned char); static void atppc_ecp_read_error(struct atppc_softc *); /* Functions to write bytes to device's output buffer */ static void atppc_std_write(struct atppc_softc * const); static void atppc_epp_write(struct atppc_softc * const); static void atppc_fifo_write(struct atppc_softc * const); static void atppc_fifo_write_dma(struct atppc_softc * const, unsigned char, unsigned char); static void atppc_fifo_write_pio(struct atppc_softc * const, unsigned char, unsigned char); static void atppc_fifo_write_error(struct atppc_softc * const, const unsigned int); /* Miscellaneous */ static int atppc_poll_str(const struct atppc_softc * const, const u_int8_t, const u_int8_t); static int atppc_wait_interrupt(struct atppc_softc * const, kcondvar_t *, const u_int8_t); /* * Generic attach and detach functions for atppc device. If sc_dev_ok in soft * configuration data is not ATPPC_ATTACHED, these should be skipped altogether. */ /* Soft configuration attach for atppc */ void atppc_sc_attach(struct atppc_softc *lsc) { /* Adapter used to configure ppbus device */ struct parport_adapter sc_parport_adapter; char buf[64]; mutex_init(&lsc->sc_lock, MUTEX_DEFAULT, IPL_TTY); cv_init(&lsc->sc_out_cv, "atppcout"); cv_init(&lsc->sc_in_cv, "atppcin"); /* Probe and set up chipset */ if (atppc_detect_chipset(lsc) != 0) { if (atppc_detect_generic(lsc) != 0) { ATPPC_DPRINTF(("%s: Error detecting chipset\n", device_xname(lsc->sc_dev))); } } /* Probe and setup FIFO queue */ if (atppc_detect_fifo(lsc) == 0) { printf("%s: FIFO =<%d,%d,%d>\n", device_xname(lsc->sc_dev), lsc->sc_fifo, lsc->sc_wthr, lsc->sc_rthr); } /* Print out chipset capabilities */ snprintb(buf, sizeof(buf), "\20\1INTR\2DMA\3FIFO\4PS2\5ECP\6EPP", lsc->sc_has); printf("%s: capabilities=%s\n", device_xname(lsc->sc_dev), buf); /* Initialize device's buffer pointers */ lsc->sc_outb = lsc->sc_outbstart = lsc->sc_inb = lsc->sc_inbstart = NULL; lsc->sc_inb_nbytes = lsc->sc_outb_nbytes = 0; /* Last configuration step: set mode to standard mode */ if (atppc_setmode(lsc->sc_dev, PPBUS_COMPATIBLE) != 0) { ATPPC_DPRINTF(("%s: unable to initialize mode.\n", device_xname(lsc->sc_dev))); } /* Set up parport_adapter structure */ /* Set capabilities */ sc_parport_adapter.capabilities = 0; if (lsc->sc_has & ATPPC_HAS_INTR) { sc_parport_adapter.capabilities |= PPBUS_HAS_INTR; } if (lsc->sc_has & ATPPC_HAS_DMA) { sc_parport_adapter.capabilities |= PPBUS_HAS_DMA; } if (lsc->sc_has & ATPPC_HAS_FIFO) { sc_parport_adapter.capabilities |= PPBUS_HAS_FIFO; } if (lsc->sc_has & ATPPC_HAS_PS2) { sc_parport_adapter.capabilities |= PPBUS_HAS_PS2; } if (lsc->sc_has & ATPPC_HAS_EPP) { sc_parport_adapter.capabilities |= PPBUS_HAS_EPP; } if (lsc->sc_has & ATPPC_HAS_ECP) { sc_parport_adapter.capabilities |= PPBUS_HAS_ECP; } /* Set function pointers */ sc_parport_adapter.parport_io = atppc_io; sc_parport_adapter.parport_exec_microseq = atppc_exec_microseq; sc_parport_adapter.parport_reset_epp_timeout = atppc_reset_epp_timeout; sc_parport_adapter.parport_setmode = atppc_setmode; sc_parport_adapter.parport_getmode = atppc_getmode; sc_parport_adapter.parport_ecp_sync = atppc_ecp_sync; sc_parport_adapter.parport_read = atppc_read; sc_parport_adapter.parport_write = atppc_write; sc_parport_adapter.parport_read_ivar = atppc_read_ivar; sc_parport_adapter.parport_write_ivar = atppc_write_ivar; sc_parport_adapter.parport_dma_malloc = lsc->sc_dma_malloc; sc_parport_adapter.parport_dma_free = lsc->sc_dma_free; sc_parport_adapter.parport_add_handler = atppc_add_handler; sc_parport_adapter.parport_remove_handler = atppc_remove_handler; /* Initialize handler list, may be added to by grandchildren */ SLIST_INIT(&(lsc->sc_handler_listhead)); /* Initialize interrupt state */ lsc->sc_irqstat = ATPPC_IRQ_NONE; lsc->sc_ecr_intr = lsc->sc_ctr_intr = lsc->sc_str_intr = 0; /* Disable DMA/interrupts (each ppbus driver selects usage itself) */ lsc->sc_use = 0; /* Configure child of the device. */ lsc->child = config_found(lsc->sc_dev, &(sc_parport_adapter), atppc_print, CFARGS_NONE); return; } /* Soft configuration detach */ int atppc_sc_detach(struct atppc_softc *lsc, int flag) { device_t dev = lsc->sc_dev; /* Detach children devices */ if (config_detach(lsc->child, flag) && !(flag & DETACH_QUIET)) { aprint_error_dev(dev, "not able to detach child device, "); if (!(flag & DETACH_FORCE)) { printf("cannot detach\n"); return 1; } else { printf("continuing (DETACH_FORCE)\n"); } } if (!(flag & DETACH_QUIET)) printf("%s detached", device_xname(dev)); return 0; } /* Used by config_found() to print out device information */ static int atppc_print(void *aux, const char *name) { /* Print out something on failure. */ if (name != NULL) { printf("%s: child devices", name); return UNCONF; } return QUIET; } /* * Machine independent detection routines for atppc driver. */ /* Detect parallel port I/O port: taken from FreeBSD code directly. */ int atppc_detect_port(bus_space_tag_t iot, bus_space_handle_t ioh) { /* * Much shorter than scheme used by lpt_isa_probe() and lpt_port_test() * in original lpt driver. * Write to data register common to all controllers and read back the * values. Also tests control and status registers. */ /* * Cannot use convenient macros because the device's config structure * may not have been created yet: major change from FreeBSD code. */ int rval; u_int8_t ctr_sav, dtr_sav, str_sav; /* Store writtable registers' values and test if they can be read */ str_sav = bus_space_read_1(iot, ioh, ATPPC_SPP_STR); ctr_sav = bus_space_read_1(iot, ioh, ATPPC_SPP_CTR); dtr_sav = bus_space_read_1(iot, ioh, ATPPC_SPP_DTR); bus_space_barrier(iot, ioh, 0, IO_LPTSIZE, BUS_SPACE_BARRIER_READ); /* * Ensure PS2 ports in output mode, also read back value of control * register. */ bus_space_write_1(iot, ioh, ATPPC_SPP_CTR, 0x0c); bus_space_barrier(iot, ioh, 0, IO_LPTSIZE, BUS_SPACE_BARRIER_WRITE); if (bus_space_read_1(iot, ioh, ATPPC_SPP_CTR) != 0x0c) { rval = 0; } else { /* * Test if two values can be written and read from the data * register. */ bus_space_barrier(iot, ioh, 0, IO_LPTSIZE, BUS_SPACE_BARRIER_READ); bus_space_write_1(iot, ioh, ATPPC_SPP_DTR, 0xaa); bus_space_barrier(iot, ioh, 0, IO_LPTSIZE, BUS_SPACE_BARRIER_WRITE); if (bus_space_read_1(iot, ioh, ATPPC_SPP_DTR) != 0xaa) { rval = 1; } else { /* Second value to test */ bus_space_barrier(iot, ioh, 0, IO_LPTSIZE, BUS_SPACE_BARRIER_READ); bus_space_write_1(iot, ioh, ATPPC_SPP_DTR, 0x55); bus_space_barrier(iot, ioh, 0, IO_LPTSIZE, BUS_SPACE_BARRIER_WRITE); if (bus_space_read_1(iot, ioh, ATPPC_SPP_DTR) != 0x55) { rval = 1; } else { rval = 0; } } } /* Restore registers */ bus_space_barrier(iot, ioh, 0, IO_LPTSIZE, BUS_SPACE_BARRIER_READ); bus_space_write_1(iot, ioh, ATPPC_SPP_CTR, ctr_sav); bus_space_write_1(iot, ioh, ATPPC_SPP_DTR, dtr_sav); bus_space_write_1(iot, ioh, ATPPC_SPP_STR, str_sav); bus_space_barrier(iot, ioh, 0, IO_LPTSIZE, BUS_SPACE_BARRIER_WRITE); return rval; } /* Detect parallel port chipset. */ static int atppc_detect_chipset(struct atppc_softc *atppc) { /* Try each detection routine. */ int i, mode; for (i = 0; chipset_detect[i] != NULL; i++) { if ((mode = chipset_detect[i](atppc)) != -1) { atppc->sc_mode = mode; return 0; } } return 1; } /* Detect generic capabilities. */ static int atppc_detect_generic(struct atppc_softc *atppc) { u_int8_t ecr_sav = atppc_r_ecr(atppc); u_int8_t ctr_sav = atppc_r_ctr(atppc); u_int8_t str_sav = atppc_r_str(atppc); u_int8_t tmp; atppc_barrier_r(atppc); /* Default to generic */ atppc->sc_type = ATPPC_TYPE_GENERIC; atppc->sc_model = GENERIC; /* Check for ECP */ tmp = atppc_r_ecr(atppc); atppc_barrier_r(atppc); if ((tmp & ATPPC_FIFO_EMPTY) && !(tmp & ATPPC_FIFO_FULL)) { atppc_w_ecr(atppc, 0x34); atppc_barrier_w(atppc); tmp = atppc_r_ecr(atppc); atppc_barrier_r(atppc); if (tmp == 0x35) { atppc->sc_has |= ATPPC_HAS_ECP; } } /* Allow search for SMC style ECP+EPP mode */ if (atppc->sc_has & ATPPC_HAS_ECP) { atppc_w_ecr(atppc, ATPPC_ECR_EPP); atppc_barrier_w(atppc); } /* Check for EPP by checking for timeout bit */ if (atppc_check_epp_timeout(atppc->sc_dev) != 0) { atppc->sc_has |= ATPPC_HAS_EPP; atppc->sc_epp = ATPPC_EPP_1_9; if (atppc->sc_has & ATPPC_HAS_ECP) { /* SMC like chipset found */ atppc->sc_model = SMC_LIKE; atppc->sc_type = ATPPC_TYPE_SMCLIKE; } } /* Detect PS2 mode */ if (atppc->sc_has & ATPPC_HAS_ECP) { /* Put ECP port into PS2 mode */ atppc_w_ecr(atppc, ATPPC_ECR_PS2); atppc_barrier_w(atppc); } /* Put PS2 port in input mode: writes should not be readable */ atppc_w_ctr(atppc, 0x20); atppc_barrier_w(atppc); /* * Write two values to data port: if neither are read back, * bidirectional mode is functional. */ atppc_w_dtr(atppc, 0xaa); atppc_barrier_w(atppc); tmp = atppc_r_dtr(atppc); atppc_barrier_r(atppc); if (tmp != 0xaa) { atppc_w_dtr(atppc, 0x55); atppc_barrier_w(atppc); tmp = atppc_r_dtr(atppc); atppc_barrier_r(atppc); if (tmp != 0x55) { atppc->sc_has |= ATPPC_HAS_PS2; } } /* Restore to previous state */ atppc_w_ecr(atppc, ecr_sav); atppc_w_ctr(atppc, ctr_sav); atppc_w_str(atppc, str_sav); atppc_barrier_w(atppc); return 0; } /* * Detect parallel port FIFO: taken from FreeBSD code directly. */ static int atppc_detect_fifo(struct atppc_softc *atppc) { #ifdef ATPPC_DEBUG device_t dev = atppc->sc_dev; #endif u_int8_t ecr_sav; u_int8_t ctr_sav; u_int8_t str_sav; u_int8_t cc; short i; /* If there is no ECP mode, we cannot config a FIFO */ if (!(atppc->sc_has & ATPPC_HAS_ECP)) { return (EINVAL); } /* save registers */ ecr_sav = atppc_r_ecr(atppc); ctr_sav = atppc_r_ctr(atppc); str_sav = atppc_r_str(atppc); atppc_barrier_r(atppc); /* Enter ECP configuration mode, no interrupt, no DMA */ atppc_w_ecr(atppc, (ATPPC_ECR_CFG | ATPPC_SERVICE_INTR) & ~ATPPC_ENABLE_DMA); atppc_barrier_w(atppc); /* read PWord size - transfers in FIFO mode must be PWord aligned */ atppc->sc_pword = (atppc_r_cnfgA(atppc) & ATPPC_PWORD_MASK); atppc_barrier_r(atppc); /* XXX 16 and 32 bits implementations not supported */ if (atppc->sc_pword != ATPPC_PWORD_8) { ATPPC_DPRINTF(("%s(%s): FIFO PWord(%d) not supported.\n", __func__, device_xname(dev), atppc->sc_pword)); goto error; } /* Byte mode, reverse direction, no interrupt, no DMA */ atppc_w_ecr(atppc, ATPPC_ECR_PS2 | ATPPC_SERVICE_INTR); atppc_w_ctr(atppc, (ctr_sav & ~IRQENABLE) | PCD); /* enter ECP test mode, no interrupt, no DMA */ atppc_w_ecr(atppc, ATPPC_ECR_TST | ATPPC_SERVICE_INTR); atppc_barrier_w(atppc); /* flush the FIFO */ for (i = 0; i < 1024; i++) { atppc_r_fifo(atppc); atppc_barrier_r(atppc); cc = atppc_r_ecr(atppc); atppc_barrier_r(atppc); if (cc & ATPPC_FIFO_EMPTY) break; } if (i >= 1024) { ATPPC_DPRINTF(("%s(%s): cannot flush FIFO.\n", __func__, device_xname(dev))); goto error; } /* Test mode, enable interrupts, no DMA */ atppc_w_ecr(atppc, ATPPC_ECR_TST); atppc_barrier_w(atppc); /* Determine readIntrThreshold - fill FIFO until serviceIntr is set */ for (i = atppc->sc_rthr = atppc->sc_fifo = 0; i < 1024; i++) { atppc_w_fifo(atppc, (char)i); atppc_barrier_w(atppc); cc = atppc_r_ecr(atppc); atppc_barrier_r(atppc); if ((atppc->sc_rthr == 0) && (cc & ATPPC_SERVICE_INTR)) { /* readThreshold reached */ atppc->sc_rthr = i + 1; } if (cc & ATPPC_FIFO_FULL) { atppc->sc_fifo = i + 1; break; } } if (i >= 1024) { ATPPC_DPRINTF(("%s(%s): cannot fill FIFO.\n", __func__, device_xname(dev))); goto error; } /* Change direction */ atppc_w_ctr(atppc, (ctr_sav & ~IRQENABLE) & ~PCD); atppc_barrier_w(atppc); /* Clear the serviceIntr bit we've already set in the above loop */ atppc_w_ecr(atppc, ATPPC_ECR_TST); atppc_barrier_w(atppc); /* Determine writeIntrThreshold - empty FIFO until serviceIntr is set */ for (atppc->sc_wthr = 0; i > -1; i--) { cc = atppc_r_fifo(atppc); atppc_barrier_r(atppc); if (cc != (char)(atppc->sc_fifo - i - 1)) { ATPPC_DPRINTF(("%s(%s): invalid data in FIFO.\n", __func__, device_xname(dev))); goto error; } cc = atppc_r_ecr(atppc); atppc_barrier_r(atppc); if ((atppc->sc_wthr == 0) && (cc & ATPPC_SERVICE_INTR)) { /* writeIntrThreshold reached */ atppc->sc_wthr = atppc->sc_fifo - i; } if (i > 0 && (cc & ATPPC_FIFO_EMPTY)) { /* If FIFO empty before the last byte, error */ ATPPC_DPRINTF(("%s(%s): data lost in FIFO.\n", __func__, device_xname(dev))); goto error; } } /* FIFO must be empty after the last byte */ cc = atppc_r_ecr(atppc); atppc_barrier_r(atppc); if (!(cc & ATPPC_FIFO_EMPTY)) { ATPPC_DPRINTF(("%s(%s): cannot empty the FIFO.\n", __func__, device_xname(dev))); goto error; } /* Restore original registers */ atppc_w_ctr(atppc, ctr_sav); atppc_w_str(atppc, str_sav); atppc_w_ecr(atppc, ecr_sav); atppc_barrier_w(atppc); /* Update capabilities */ atppc->sc_has |= ATPPC_HAS_FIFO; return 0; error: /* Restore original registers */ atppc_w_ctr(atppc, ctr_sav); atppc_w_str(atppc, str_sav); atppc_w_ecr(atppc, ecr_sav); atppc_barrier_w(atppc); return (EINVAL); } /* Interrupt handler for atppc device: wakes up read/write functions */ int atppcintr(void *arg) { device_t dev = arg; struct atppc_softc *atppc = device_private(dev); int claim = 1; enum { NONE, READER, WRITER } wake_up = NONE; mutex_enter(&atppc->sc_lock); /* Record registers' status */ atppc->sc_str_intr = atppc_r_str(atppc); atppc->sc_ctr_intr = atppc_r_ctr(atppc); atppc->sc_ecr_intr = atppc_r_ecr(atppc); atppc_barrier_r(atppc); /* Determine cause of interrupt and wake up top half */ switch (atppc->sc_mode) { case ATPPC_MODE_STD: /* nAck pulsed for 5 usec, too fast to check reliably, assume */ atppc->sc_irqstat = ATPPC_IRQ_nACK; if (atppc->sc_outb) wake_up = WRITER; else claim = 0; break; case ATPPC_MODE_NIBBLE: case ATPPC_MODE_PS2: /* nAck is set low by device and then high on ack */ if (!(atppc->sc_str_intr & nACK)) { claim = 0; break; } atppc->sc_irqstat = ATPPC_IRQ_nACK; if (atppc->sc_inb) wake_up = READER; break; case ATPPC_MODE_ECP: case ATPPC_MODE_FAST: /* Confirm interrupt cause: these are not pulsed as in nAck. */ if (atppc->sc_ecr_intr & ATPPC_SERVICE_INTR) { if (atppc->sc_ecr_intr & ATPPC_ENABLE_DMA) atppc->sc_irqstat |= ATPPC_IRQ_DMA; else atppc->sc_irqstat |= ATPPC_IRQ_FIFO; /* Decide where top half will be waiting */ if (atppc->sc_mode & ATPPC_MODE_ECP) { if (atppc->sc_ctr_intr & PCD) { if (atppc->sc_inb) wake_up = READER; else claim = 0; } else { if (atppc->sc_outb) wake_up = WRITER; else claim = 0; } } else { if (atppc->sc_outb) wake_up = WRITER; else claim = 0; } } /* Determine if nFault has occurred */ if ((atppc->sc_mode & ATPPC_MODE_ECP) && (atppc->sc_ecr_intr & ATPPC_nFAULT_INTR) && !(atppc->sc_str_intr & nFAULT)) { /* Device is requesting the channel */ atppc->sc_irqstat |= ATPPC_IRQ_nFAULT; claim = 1; } break; case ATPPC_MODE_EPP: /* nAck pulsed for 5 usec, too fast to check reliably */ atppc->sc_irqstat = ATPPC_IRQ_nACK; if (atppc->sc_inb) wake_up = WRITER; else if (atppc->sc_outb) wake_up = READER; else claim = 0; break; default: panic("%s: chipset is in invalid mode.", device_xname(dev)); } if (claim) { switch (wake_up) { case NONE: break; case READER: cv_broadcast(&atppc->sc_in_cv); break; case WRITER: cv_broadcast(&atppc->sc_out_cv); break; } } /* Call all of the installed handlers */ if (claim) { struct atppc_handler_node * callback; SLIST_FOREACH(callback, &(atppc->sc_handler_listhead), entries) { (*callback->func)(callback->arg); } } mutex_exit(&atppc->sc_lock); return claim; } /* Functions which support ppbus interface */ /* Check EPP mode timeout */ static int atppc_check_epp_timeout(device_t dev) { struct atppc_softc *atppc = device_private(dev); int error; mutex_enter(&atppc->sc_lock); atppc_reset_epp_timeout(dev); error = !(atppc_r_str(atppc) & TIMEOUT); atppc_barrier_r(atppc); mutex_exit(&atppc->sc_lock); return (error); } /* * EPP timeout, according to the PC87332 manual * Semantics of clearing EPP timeout bit. * PC87332 - reading SPP_STR does it... * SMC - write 1 to EPP timeout bit XXX * Others - (?) write 0 to EPP timeout bit */ static void atppc_reset_epp_timeout(device_t dev) { struct atppc_softc *atppc = device_private(dev); register unsigned char r; r = atppc_r_str(atppc); atppc_barrier_r(atppc); atppc_w_str(atppc, r | 0x1); atppc_barrier_w(atppc); atppc_w_str(atppc, r & 0xfe); atppc_barrier_w(atppc); return; } /* Read from atppc device: returns 0 on success. */ static int atppc_read(device_t dev, char *buf, int len, int ioflag, size_t *cnt) { struct atppc_softc *atppc = device_private(dev); int error = 0; mutex_enter(&atppc->sc_lock); *cnt = 0; /* Initialize buffer */ atppc->sc_inb = atppc->sc_inbstart = buf; atppc->sc_inb_nbytes = len; /* Initialize device input error state for new operation */ atppc->sc_inerr = 0; /* Call appropriate function to read bytes */ switch(atppc->sc_mode) { case ATPPC_MODE_STD: case ATPPC_MODE_FAST: error = ENODEV; break; case ATPPC_MODE_NIBBLE: atppc_nibble_read(atppc); break; case ATPPC_MODE_PS2: atppc_byte_read(atppc); break; case ATPPC_MODE_ECP: atppc_ecp_read(atppc); break; case ATPPC_MODE_EPP: atppc_epp_read(atppc); break; default: panic("%s(%s): chipset in invalid mode.\n", __func__, device_xname(dev)); } /* Update counter*/ *cnt = (atppc->sc_inbstart - atppc->sc_inb); /* Reset buffer */ atppc->sc_inb = atppc->sc_inbstart = NULL; atppc->sc_inb_nbytes = 0; if (!(error)) error = atppc->sc_inerr; mutex_exit(&atppc->sc_lock); return (error); } /* Write to atppc device: returns 0 on success. */ static int atppc_write(device_t dev, char *buf, int len, int ioflag, size_t *cnt) { struct atppc_softc * const atppc = device_private(dev); int error = 0; *cnt = 0; mutex_enter(&atppc->sc_lock); /* Set up line buffer */ atppc->sc_outb = atppc->sc_outbstart = buf; atppc->sc_outb_nbytes = len; /* Initialize device output error state for new operation */ atppc->sc_outerr = 0; /* Call appropriate function to write bytes */ switch (atppc->sc_mode) { case ATPPC_MODE_STD: atppc_std_write(atppc); break; case ATPPC_MODE_NIBBLE: case ATPPC_MODE_PS2: error = ENODEV; break; case ATPPC_MODE_FAST: case ATPPC_MODE_ECP: atppc_fifo_write(atppc); break; case ATPPC_MODE_EPP: atppc_epp_write(atppc); break; default: panic("%s(%s): chipset in invalid mode.\n", __func__, device_xname(dev)); } /* Update counter*/ *cnt = (atppc->sc_outbstart - atppc->sc_outb); /* Reset output buffer */ atppc->sc_outb = atppc->sc_outbstart = NULL; atppc->sc_outb_nbytes = 0; if (!(error)) error = atppc->sc_outerr; mutex_exit(&atppc->sc_lock); return (error); } /* * Set mode of chipset to mode argument. Modes not supported are ignored. If * multiple modes are flagged, the mode is not changed. Mode's are those * defined for ppbus_softc.sc_mode in ppbus_conf.h. Only ECP-capable chipsets * can change their mode of operation. However, ALL operation modes support * centronics mode and nibble mode. Modes determine both hardware AND software * behaviour. * NOTE: the mode for ECP should only be changed when the channel is in * forward idle mode. This function does not make sure FIFO's have flushed or * any consistency checks. */ static int atppc_setmode(device_t dev, int mode) { struct atppc_softc *atppc = device_private(dev); u_int8_t ecr; u_int8_t chipset_mode; int rval = 0; mutex_enter(&atppc->sc_lock); /* If ECP capable, configure ecr register */ if (atppc->sc_has & ATPPC_HAS_ECP) { /* Read ECR with mode masked out */ ecr = (atppc_r_ecr(atppc) & 0x1f); atppc_barrier_r(atppc); switch (mode) { case PPBUS_ECP: /* Set ECP mode */ ecr |= ATPPC_ECR_ECP; chipset_mode = ATPPC_MODE_ECP; break; case PPBUS_EPP: /* Set EPP mode */ if (atppc->sc_has & ATPPC_HAS_EPP) { ecr |= ATPPC_ECR_EPP; chipset_mode = ATPPC_MODE_EPP; } else { rval = ENODEV; goto end; } break; case PPBUS_FAST: /* Set fast centronics mode */ ecr |= ATPPC_ECR_FIFO; chipset_mode = ATPPC_MODE_FAST; break; case PPBUS_PS2: /* Set PS2 mode */ ecr |= ATPPC_ECR_PS2; chipset_mode = ATPPC_MODE_PS2; break; case PPBUS_COMPATIBLE: /* Set standard mode */ ecr |= ATPPC_ECR_STD; chipset_mode = ATPPC_MODE_STD; break; case PPBUS_NIBBLE: /* Set nibble mode: uses chipset standard mode */ ecr |= ATPPC_ECR_STD; chipset_mode = ATPPC_MODE_NIBBLE; break; default: /* Invalid mode specified for ECP chip */ ATPPC_DPRINTF(("%s(%s): invalid mode passed as " "argument.\n", __func__, device_xname(dev))); rval = ENODEV; goto end; } /* Switch to byte mode to be able to change modes. */ atppc_w_ecr(atppc, ATPPC_ECR_PS2); atppc_barrier_w(atppc); /* Update mode */ atppc_w_ecr(atppc, ecr); atppc_barrier_w(atppc); } else { switch (mode) { case PPBUS_EPP: if (atppc->sc_has & ATPPC_HAS_EPP) { chipset_mode = ATPPC_MODE_EPP; } else { rval = ENODEV; goto end; } break; case PPBUS_PS2: if (atppc->sc_has & ATPPC_HAS_PS2) { chipset_mode = ATPPC_MODE_PS2; } else { rval = ENODEV; goto end; } break; case PPBUS_NIBBLE: /* Set nibble mode (virtual) */ chipset_mode = ATPPC_MODE_NIBBLE; break; case PPBUS_COMPATIBLE: chipset_mode = ATPPC_MODE_STD; break; case PPBUS_ECP: rval = ENODEV; goto end; default: ATPPC_DPRINTF(("%s(%s): invalid mode passed as " "argument.\n", __func__, device_xname(dev))); rval = ENODEV; goto end; } } atppc->sc_mode = chipset_mode; if (chipset_mode == ATPPC_MODE_PS2) { /* Set direction bit to reverse */ ecr = atppc_r_ctr(atppc); atppc_barrier_r(atppc); ecr |= PCD; atppc_w_ctr(atppc, ecr); atppc_barrier_w(atppc); } end: mutex_exit(&atppc->sc_lock); return rval; } /* Get the current mode of chipset */ static int atppc_getmode(device_t dev) { struct atppc_softc *atppc = device_private(dev); int mode; mutex_enter(&atppc->sc_lock); /* The chipset can only be in one mode at a time logically */ switch (atppc->sc_mode) { case ATPPC_MODE_ECP: mode = PPBUS_ECP; break; case ATPPC_MODE_EPP: mode = PPBUS_EPP; break; case ATPPC_MODE_PS2: mode = PPBUS_PS2; break; case ATPPC_MODE_STD: mode = PPBUS_COMPATIBLE; break; case ATPPC_MODE_NIBBLE: mode = PPBUS_NIBBLE; break; case ATPPC_MODE_FAST: mode = PPBUS_FAST; break; default: panic("%s(%s): device is in invalid mode!", __func__, device_xname(dev)); break; } mutex_exit(&atppc->sc_lock); return mode; } /* Wait for FIFO buffer to empty for ECP-capable chipset */ static void atppc_ecp_sync(device_t dev) { struct atppc_softc *atppc = device_private(dev); int i; u_int8_t r; mutex_enter(&atppc->sc_lock); /* * Only wait for FIFO to empty if mode is chipset is ECP-capable AND * the mode is either ECP or Fast Centronics. */ r = atppc_r_ecr(atppc); atppc_barrier_r(atppc); r &= 0xe0; if (!(atppc->sc_has & ATPPC_HAS_ECP) || ((r != ATPPC_ECR_ECP) && (r != ATPPC_ECR_FIFO))) { goto end; } /* Wait for FIFO to empty */ for (i = 0; i < ((MAXBUSYWAIT/hz) * 1000000); i += 100) { r = atppc_r_ecr(atppc); atppc_barrier_r(atppc); if (r & ATPPC_FIFO_EMPTY) { goto end; } delay(100); /* Supposed to be a 100 usec delay */ } ATPPC_DPRINTF(("%s: ECP sync failed, data still in FIFO.\n", device_xname(dev))); end: mutex_exit(&atppc->sc_lock); return; } /* Execute a microsequence to handle fast I/O operations. */ static int atppc_exec_microseq(device_t dev, struct ppbus_microseq **p_msq) { struct atppc_softc *atppc = device_private(dev); struct ppbus_microseq *mi = *p_msq; char cc, *p; int i, iter, len; int error; register int reg; register unsigned char mask; register int accum = 0; register char *ptr = NULL; struct ppbus_microseq *stack = NULL; mutex_enter(&atppc->sc_lock); /* microsequence registers are equivalent to PC-like port registers */ #define r_reg(register,atppc) bus_space_read_1((atppc)->sc_iot, \ (atppc)->sc_ioh, (register)) #define w_reg(register, atppc, byte) bus_space_write_1((atppc)->sc_iot, \ (atppc)->sc_ioh, (register), (byte)) /* Loop until microsequence execution finishes (ending op code) */ for (;;) { switch (mi->opcode) { case MS_OP_RSET: cc = r_reg(mi->arg[0].i, atppc); atppc_barrier_r(atppc); cc &= (char)mi->arg[2].i; /* clear mask */ cc |= (char)mi->arg[1].i; /* assert mask */ w_reg(mi->arg[0].i, atppc, cc); atppc_barrier_w(atppc); mi++; break; case MS_OP_RASSERT_P: reg = mi->arg[1].i; ptr = atppc->sc_ptr; if ((len = mi->arg[0].i) == MS_ACCUM) { accum = atppc->sc_accum; for (; accum; accum--) { w_reg(reg, atppc, *ptr++); atppc_barrier_w(atppc); } atppc->sc_accum = accum; } else { for (i = 0; i < len; i++) { w_reg(reg, atppc, *ptr++); atppc_barrier_w(atppc); } } atppc->sc_ptr = ptr; mi++; break; case MS_OP_RFETCH_P: reg = mi->arg[1].i; mask = (char)mi->arg[2].i; ptr = atppc->sc_ptr; if ((len = mi->arg[0].i) == MS_ACCUM) { accum = atppc->sc_accum; for (; accum; accum--) { *ptr++ = r_reg(reg, atppc) & mask; atppc_barrier_r(atppc); } atppc->sc_accum = accum; } else { for (i = 0; i < len; i++) { *ptr++ = r_reg(reg, atppc) & mask; atppc_barrier_r(atppc); } } atppc->sc_ptr = ptr; mi++; break; case MS_OP_RFETCH: *((char *)mi->arg[2].p) = r_reg(mi->arg[0].i, atppc) & (char)mi->arg[1].i; atppc_barrier_r(atppc); mi++; break; case MS_OP_RASSERT: case MS_OP_DELAY: /* let's suppose the next instr. is the same */ do { for (;mi->opcode == MS_OP_RASSERT; mi++) { w_reg(mi->arg[0].i, atppc, (char)mi->arg[1].i); atppc_barrier_w(atppc); } for (;mi->opcode == MS_OP_DELAY; mi++) { delay(mi->arg[0].i); } } while (mi->opcode == MS_OP_RASSERT); break; case MS_OP_ADELAY: if (mi->arg[0].i) { tsleep(atppc, PPBUSPRI, "atppcdelay", mi->arg[0].i * (hz/1000)); } mi++; break; case MS_OP_TRIG: reg = mi->arg[0].i; iter = mi->arg[1].i; p = (char *)mi->arg[2].p; /* XXX delay limited to 255 us */ for (i = 0; i < iter; i++) { w_reg(reg, atppc, *p++); atppc_barrier_w(atppc); delay((unsigned char)*p++); } mi++; break; case MS_OP_SET: atppc->sc_accum = mi->arg[0].i; mi++; break; case MS_OP_DBRA: if (--atppc->sc_accum > 0) { mi += mi->arg[0].i; } mi++; break; case MS_OP_BRSET: cc = atppc_r_str(atppc); atppc_barrier_r(atppc); if ((cc & (char)mi->arg[0].i) == (char)mi->arg[0].i) { mi += mi->arg[1].i; } mi++; break; case MS_OP_BRCLEAR: cc = atppc_r_str(atppc); atppc_barrier_r(atppc); if ((cc & (char)mi->arg[0].i) == 0) { mi += mi->arg[1].i; } mi++; break; case MS_OP_BRSTAT: cc = atppc_r_str(atppc); atppc_barrier_r(atppc); if ((cc & ((char)mi->arg[0].i | (char)mi->arg[1].i)) == (char)mi->arg[0].i) { mi += mi->arg[2].i; } mi++; break; case MS_OP_C_CALL: /* * If the C call returns !0 then end the microseq. * The current state of ptr is passed to the C function */ if ((error = mi->arg[0].f(mi->arg[1].p, atppc->sc_ptr))) { mutex_exit(&atppc->sc_lock); return (error); } mi++; break; case MS_OP_PTR: atppc->sc_ptr = (char *)mi->arg[0].p; mi++; break; case MS_OP_CALL: if (stack) { panic("%s - %s: too much calls", device_xname(dev), __func__); } if (mi->arg[0].p) { /* store state of the actual microsequence */ stack = mi; /* jump to the new microsequence */ mi = (struct ppbus_microseq *)mi->arg[0].p; } else { mi++; } break; case MS_OP_SUBRET: /* retrieve microseq and pc state before the call */ mi = stack; /* reset the stack */ stack = 0; /* XXX return code */ mi++; break; case MS_OP_PUT: case MS_OP_GET: case MS_OP_RET: /* * Can't return to atppc level during the execution * of a submicrosequence. */ if (stack) { panic("%s: cannot return to atppc level", __func__); } /* update pc for atppc level of execution */ *p_msq = mi; mutex_exit(&atppc->sc_lock); return (0); break; default: panic("%s: unknown microsequence " "opcode 0x%x", __func__, mi->opcode); break; } } /* Should not be reached! */ #ifdef ATPPC_DEBUG panic("%s: unexpected code reached!\n", __func__); #endif } /* General I/O routine */ static u_int8_t atppc_io(device_t dev, int iop, u_char *addr, int cnt, u_char byte) { struct atppc_softc *atppc = device_private(dev); u_int8_t val = 0; mutex_enter(&atppc->sc_lock); switch (iop) { case PPBUS_OUTSB_EPP: bus_space_write_multi_1(atppc->sc_iot, atppc->sc_ioh, ATPPC_EPP_DATA, addr, cnt); break; case PPBUS_OUTSW_EPP: bus_space_write_multi_2(atppc->sc_iot, atppc->sc_ioh, ATPPC_EPP_DATA, (u_int16_t *)addr, cnt); break; case PPBUS_OUTSL_EPP: bus_space_write_multi_4(atppc->sc_iot, atppc->sc_ioh, ATPPC_EPP_DATA, (u_int32_t *)addr, cnt); break; case PPBUS_INSB_EPP: bus_space_read_multi_1(atppc->sc_iot, atppc->sc_ioh, ATPPC_EPP_DATA, addr, cnt); break; case PPBUS_INSW_EPP: bus_space_read_multi_2(atppc->sc_iot, atppc->sc_ioh, ATPPC_EPP_DATA, (u_int16_t *)addr, cnt); break; case PPBUS_INSL_EPP: bus_space_read_multi_4(atppc->sc_iot, atppc->sc_ioh, ATPPC_EPP_DATA, (u_int32_t *)addr, cnt); break; case PPBUS_RDTR: val = (atppc_r_dtr(atppc)); break; case PPBUS_RSTR: val = (atppc_r_str(atppc)); break; case PPBUS_RCTR: val = (atppc_r_ctr(atppc)); break; case PPBUS_REPP_A: val = (atppc_r_eppA(atppc)); break; case PPBUS_REPP_D: val = (atppc_r_eppD(atppc)); break; case PPBUS_RECR: val = (atppc_r_ecr(atppc)); break; case PPBUS_RFIFO: val = (atppc_r_fifo(atppc)); break; case PPBUS_WDTR: atppc_w_dtr(atppc, byte); break; case PPBUS_WSTR: atppc_w_str(atppc, byte); break; case PPBUS_WCTR: atppc_w_ctr(atppc, byte); break; case PPBUS_WEPP_A: atppc_w_eppA(atppc, byte); break; case PPBUS_WEPP_D: atppc_w_eppD(atppc, byte); break; case PPBUS_WECR: atppc_w_ecr(atppc, byte); break; case PPBUS_WFIFO: atppc_w_fifo(atppc, byte); break; default: panic("%s(%s): unknown I/O operation", device_xname(dev), __func__); break; } atppc_barrier(atppc); mutex_exit(&atppc->sc_lock); return val; } /* Read "instance variables" of atppc device */ static int atppc_read_ivar(device_t dev, int index, unsigned int *val) { struct atppc_softc *atppc = device_private(dev); int rval = 0; mutex_enter(&atppc->sc_lock); switch(index) { case PPBUS_IVAR_EPP_PROTO: if (atppc->sc_epp == ATPPC_EPP_1_9) *val = PPBUS_EPP_1_9; else if (atppc->sc_epp == ATPPC_EPP_1_7) *val = PPBUS_EPP_1_7; /* XXX what if not using EPP ? */ break; case PPBUS_IVAR_INTR: *val = ((atppc->sc_use & ATPPC_USE_INTR) != 0); break; case PPBUS_IVAR_DMA: *val = ((atppc->sc_use & ATPPC_USE_DMA) != 0); break; default: rval = ENODEV; } mutex_exit(&atppc->sc_lock); return rval; } /* Write "instance variables" of atppc device */ static int atppc_write_ivar(device_t dev, int index, unsigned int *val) { struct atppc_softc *atppc = device_private(dev); int rval = 0; mutex_enter(&atppc->sc_lock); switch(index) { case PPBUS_IVAR_EPP_PROTO: if (*val == PPBUS_EPP_1_9 || *val == PPBUS_EPP_1_7) atppc->sc_epp = *val; else rval = EINVAL; break; case PPBUS_IVAR_INTR: if (*val == 0) atppc->sc_use &= ~ATPPC_USE_INTR; else if (atppc->sc_has & ATPPC_HAS_INTR) atppc->sc_use |= ATPPC_USE_INTR; else rval = ENODEV; break; case PPBUS_IVAR_DMA: if (*val == 0) atppc->sc_use &= ~ATPPC_USE_DMA; else if (atppc->sc_has & ATPPC_HAS_DMA) atppc->sc_use |= ATPPC_USE_DMA; else rval = ENODEV; break; default: rval = ENODEV; } mutex_exit(&atppc->sc_lock); return rval; } /* Add a handler routine to be called by the interrupt handler */ static int atppc_add_handler(device_t dev, void (*handler)(void *), void *arg) { struct atppc_softc *atppc = device_private(dev); struct atppc_handler_node *callback; if (handler == NULL) { ATPPC_DPRINTF(("%s(%s): attempt to register NULL handler.\n", __func__, device_xname(dev))); return EINVAL; } callback = kmem_alloc(sizeof(*callback), KM_SLEEP); callback->func = handler; callback->arg = arg; mutex_enter(&atppc->sc_lock); SLIST_INSERT_HEAD(&(atppc->sc_handler_listhead), callback, entries); mutex_exit(&atppc->sc_lock); return 0; } /* Remove a handler added by atppc_add_handler() */ static int atppc_remove_handler(device_t dev, void (*handler)(void *)) { struct atppc_softc *atppc = device_private(dev); struct atppc_handler_node *callback; int rval = EINVAL; mutex_enter(&atppc->sc_lock); if (SLIST_EMPTY(&(atppc->sc_handler_listhead))) panic("%s(%s): attempt to remove handler from empty list.\n", __func__, device_xname(dev)); /* Search list for handler */ SLIST_FOREACH(callback, &(atppc->sc_handler_listhead), entries) { if (callback->func == handler) { SLIST_REMOVE(&(atppc->sc_handler_listhead), callback, atppc_handler_node, entries); rval = 0; break; } } mutex_exit(&atppc->sc_lock); if (rval == 0) { kmem_free(callback, sizeof(*callback)); } return rval; } /* Utility functions */ /* * Functions that read bytes from port into buffer: called from interrupt * handler depending on current chipset mode and cause of interrupt. Return * value: number of bytes moved. */ /* Only the lower 4 bits of the final value are valid */ #define nibble2char(s) ((((s) & ~nACK) >> 3) | (~(s) & nBUSY) >> 4) /* Read bytes in nibble mode */ static void atppc_nibble_read(struct atppc_softc *atppc) { int i; u_int8_t nibble[2]; u_int8_t ctr; u_int8_t str; /* Enable interrupts if needed */ if (atppc->sc_use & ATPPC_USE_INTR) { ctr = atppc_r_ctr(atppc); atppc_barrier_r(atppc); if (!(ctr & IRQENABLE)) { ctr |= IRQENABLE; atppc_w_ctr(atppc, ctr); atppc_barrier_w(atppc); } } while (atppc->sc_inbstart < (atppc->sc_inb + atppc->sc_inb_nbytes)) { /* Check if device has data to send in idle phase */ str = atppc_r_str(atppc); atppc_barrier_r(atppc); if (str & nDATAVAIL) { return; } /* Nibble-mode handshake transfer */ for (i = 0; i < 2; i++) { /* Event 7 - ready to take data (HOSTBUSY low) */ ctr = atppc_r_ctr(atppc); atppc_barrier_r(atppc); ctr |= HOSTBUSY; atppc_w_ctr(atppc, ctr); atppc_barrier_w(atppc); /* Event 8 - peripheral writes the first nibble */ /* Event 9 - peripheral set nAck low */ atppc->sc_inerr = atppc_poll_str(atppc, 0, PTRCLK); if (atppc->sc_inerr) return; /* read nibble */ nibble[i] = atppc_r_str(atppc); /* Event 10 - ack, nibble received */ ctr &= ~HOSTBUSY; atppc_w_ctr(atppc, ctr); /* Event 11 - wait ack from peripheral */ if (atppc->sc_use & ATPPC_USE_INTR) atppc->sc_inerr = atppc_wait_interrupt(atppc, &atppc->sc_in_cv, ATPPC_IRQ_nACK); else atppc->sc_inerr = atppc_poll_str(atppc, PTRCLK, PTRCLK); if (atppc->sc_inerr) return; } /* Store byte transferred */ *(atppc->sc_inbstart) = ((nibble2char(nibble[1]) << 4) & 0xf0) | (nibble2char(nibble[0]) & 0x0f); atppc->sc_inbstart++; } } /* Read bytes in bidirectional mode */ static void atppc_byte_read(struct atppc_softc * const atppc) { u_int8_t ctr; u_int8_t str; /* Check direction bit */ ctr = atppc_r_ctr(atppc); atppc_barrier_r(atppc); if (!(ctr & PCD)) { ATPPC_DPRINTF(("%s: byte-mode read attempted without direction " "bit set.", device_xname(atppc->sc_dev))); atppc->sc_inerr = ENODEV; return; } /* Enable interrupts if needed */ if (atppc->sc_use & ATPPC_USE_INTR) { if (!(ctr & IRQENABLE)) { ctr |= IRQENABLE; atppc_w_ctr(atppc, ctr); atppc_barrier_w(atppc); } } /* Byte-mode handshake transfer */ while (atppc->sc_inbstart < (atppc->sc_inb + atppc->sc_inb_nbytes)) { /* Check if device has data to send */ str = atppc_r_str(atppc); atppc_barrier_r(atppc); if (str & nDATAVAIL) { return; } /* Event 7 - ready to take data (nAUTO low) */ ctr |= HOSTBUSY; atppc_w_ctr(atppc, ctr); atppc_barrier_w(atppc); /* Event 9 - peripheral set nAck low */ atppc->sc_inerr = atppc_poll_str(atppc, 0, PTRCLK); if (atppc->sc_inerr) return; /* Store byte transferred */ *(atppc->sc_inbstart) = atppc_r_dtr(atppc); atppc_barrier_r(atppc); /* Event 10 - data received, can't accept more */ ctr &= ~HOSTBUSY; atppc_w_ctr(atppc, ctr); atppc_barrier_w(atppc); /* Event 11 - peripheral ack */ if (atppc->sc_use & ATPPC_USE_INTR) atppc->sc_inerr = atppc_wait_interrupt(atppc, &atppc->sc_in_cv, ATPPC_IRQ_nACK); else atppc->sc_inerr = atppc_poll_str(atppc, PTRCLK, PTRCLK); if (atppc->sc_inerr) return; /* Event 16 - strobe */ str |= HOSTCLK; atppc_w_str(atppc, str); atppc_barrier_w(atppc); DELAY(1); str &= ~HOSTCLK; atppc_w_str(atppc, str); atppc_barrier_w(atppc); /* Update counter */ atppc->sc_inbstart++; } } /* Read bytes in EPP mode */ static void atppc_epp_read(struct atppc_softc * atppc) { if (atppc->sc_epp == ATPPC_EPP_1_9) { { uint8_t str; int i; atppc_reset_epp_timeout(atppc->sc_dev); for (i = 0; i < atppc->sc_inb_nbytes; i++) { *(atppc->sc_inbstart) = atppc_r_eppD(atppc); atppc_barrier_r(atppc); str = atppc_r_str(atppc); atppc_barrier_r(atppc); if (str & TIMEOUT) { atppc->sc_inerr = EIO; break; } atppc->sc_inbstart++; } } } else { /* Read data block from EPP data register */ atppc_r_eppD_multi(atppc, atppc->sc_inbstart, atppc->sc_inb_nbytes); atppc_barrier_r(atppc); /* Update buffer position, byte count and counter */ atppc->sc_inbstart += atppc->sc_inb_nbytes; } return; } /* Read bytes in ECP mode */ static void atppc_ecp_read(struct atppc_softc *atppc) { u_int8_t ecr; u_int8_t ctr; u_int8_t str; const unsigned char ctr_sav = atppc_r_ctr(atppc); const unsigned char ecr_sav = atppc_r_ecr(atppc); unsigned int worklen; /* Check direction bit */ ctr = ctr_sav; atppc_barrier_r(atppc); if (!(ctr & PCD)) { ATPPC_DPRINTF(("%s: ecp-mode read attempted without direction " "bit set.", device_xname(atppc->sc_dev))); atppc->sc_inerr = ENODEV; goto end; } /* Clear device request if any */ if (atppc->sc_use & ATPPC_USE_INTR) atppc->sc_irqstat &= ~ATPPC_IRQ_nFAULT; while (atppc->sc_inbstart < (atppc->sc_inb + atppc->sc_inb_nbytes)) { ecr = atppc_r_ecr(atppc); atppc_barrier_r(atppc); if (ecr & ATPPC_FIFO_EMPTY) { /* Check for invalid state */ if (ecr & ATPPC_FIFO_FULL) { atppc_ecp_read_error(atppc); break; } /* Check if device has data to send */ str = atppc_r_str(atppc); atppc_barrier_r(atppc); if (str & nDATAVAIL) { break; } if (atppc->sc_use & ATPPC_USE_INTR) { /* Enable interrupts */ ecr &= ~ATPPC_SERVICE_INTR; atppc_w_ecr(atppc, ecr); atppc_barrier_w(atppc); /* Wait for FIFO to fill */ atppc->sc_inerr = atppc_wait_interrupt(atppc, &atppc->sc_in_cv, ATPPC_IRQ_FIFO); if (atppc->sc_inerr) break; } else { DELAY(1); } continue; } else if (ecr & ATPPC_FIFO_FULL) { /* Transfer sc_fifo bytes */ worklen = atppc->sc_fifo; } else if (ecr & ATPPC_SERVICE_INTR) { /* Transfer sc_rthr bytes */ worklen = atppc->sc_rthr; } else { /* At least one byte is in the FIFO */ worklen = 1; } if ((atppc->sc_use & ATPPC_USE_INTR) && (atppc->sc_use & ATPPC_USE_DMA)) { atppc_ecp_read_dma(atppc, &worklen, ecr); } else { atppc_ecp_read_pio(atppc, &worklen, ecr); } if (atppc->sc_inerr) { atppc_ecp_read_error(atppc); break; } /* Update counter */ atppc->sc_inbstart += worklen; } end: atppc_w_ctr(atppc, ctr_sav); atppc_w_ecr(atppc, ecr_sav); atppc_barrier_w(atppc); } /* Read bytes in ECP mode using DMA transfers */ static void atppc_ecp_read_dma(struct atppc_softc *atppc, unsigned int *length, unsigned char ecr) { /* Limit transfer to maximum DMA size and start it */ *length = uimin(*length, atppc->sc_dma_maxsize); atppc->sc_dmastat = ATPPC_DMA_INIT; atppc->sc_dma_start(atppc, atppc->sc_inbstart, *length, ATPPC_DMA_MODE_READ); atppc->sc_dmastat = ATPPC_DMA_STARTED; /* Enable interrupts, DMA */ ecr &= ~ATPPC_SERVICE_INTR; ecr |= ATPPC_ENABLE_DMA; atppc_w_ecr(atppc, ecr); atppc_barrier_w(atppc); /* Wait for DMA completion */ atppc->sc_inerr = atppc_wait_interrupt(atppc, &atppc->sc_in_cv, ATPPC_IRQ_DMA); if (atppc->sc_inerr) return; /* Get register value recorded by interrupt handler */ ecr = atppc->sc_ecr_intr; /* Clear DMA programming */ atppc->sc_dma_finish(atppc); atppc->sc_dmastat = ATPPC_DMA_COMPLETE; /* Disable DMA */ ecr &= ~ATPPC_ENABLE_DMA; atppc_w_ecr(atppc, ecr); atppc_barrier_w(atppc); } /* Read bytes in ECP mode using PIO transfers */ static void atppc_ecp_read_pio(struct atppc_softc *atppc, unsigned int *length, unsigned char ecr) { /* Disable DMA */ ecr &= ~ATPPC_ENABLE_DMA; atppc_w_ecr(atppc, ecr); atppc_barrier_w(atppc); /* Read from FIFO */ atppc_r_fifo_multi(atppc, atppc->sc_inbstart, *length); } /* Handle errors for ECP reads */ static void atppc_ecp_read_error(struct atppc_softc *atppc) { unsigned char ecr = atppc_r_ecr(atppc); /* Abort DMA if not finished */ if (atppc->sc_dmastat == ATPPC_DMA_STARTED) { atppc->sc_dma_abort(atppc); ATPPC_DPRINTF(("%s: DMA interrupted.\n", __func__)); } /* Check for invalid states */ if ((ecr & ATPPC_FIFO_EMPTY) && (ecr & ATPPC_FIFO_FULL)) { ATPPC_DPRINTF(("%s: FIFO full+empty bits set.\n", __func__)); ATPPC_DPRINTF(("%s: resetting FIFO.\n", __func__)); atppc_w_ecr(atppc, ATPPC_ECR_PS2); atppc_barrier_w(atppc); } } /* * Functions that write bytes to port from buffer: called from atppc_write() * function depending on current chipset mode. Returns number of bytes moved. */ /* Write bytes in std/bidirectional mode */ static void atppc_std_write(struct atppc_softc * const atppc) { unsigned char ctr; ctr = atppc_r_ctr(atppc); atppc_barrier_r(atppc); /* Enable interrupts if needed */ if (atppc->sc_use & ATPPC_USE_INTR) { if (!(ctr & IRQENABLE)) { ctr |= IRQENABLE; atppc_w_ctr(atppc, ctr); atppc_barrier_w(atppc); } } while (atppc->sc_outbstart < (atppc->sc_outb + atppc->sc_outb_nbytes)) { /* Wait for peripheral to become ready for MAXBUSYWAIT */ atppc->sc_outerr = atppc_poll_str(atppc, SPP_READY, SPP_MASK); if (atppc->sc_outerr) return; /* Put data in data register */ atppc_w_dtr(atppc, *(atppc->sc_outbstart)); atppc_barrier_w(atppc); DELAY(1); /* Pulse strobe to indicate valid data on lines */ ctr |= STROBE; atppc_w_ctr(atppc, ctr); atppc_barrier_w(atppc); DELAY(1); ctr &= ~STROBE; atppc_w_ctr(atppc, ctr); atppc_barrier_w(atppc); /* Wait for nACK for MAXBUSYWAIT */ if (atppc->sc_use & ATPPC_USE_INTR) { atppc->sc_outerr = atppc_wait_interrupt(atppc, &atppc->sc_out_cv, ATPPC_IRQ_nACK); if (atppc->sc_outerr) return; } else { /* Try to catch the pulsed acknowledgement */ atppc->sc_outerr = atppc_poll_str(atppc, 0, nACK); if (atppc->sc_outerr) return; atppc->sc_outerr = atppc_poll_str(atppc, nACK, nACK); if (atppc->sc_outerr) return; } /* Update buffer position, byte count and counter */ atppc->sc_outbstart++; } } /* Write bytes in EPP mode */ static void atppc_epp_write(struct atppc_softc *atppc) { if (atppc->sc_epp == ATPPC_EPP_1_9) { { uint8_t str; int i; atppc_reset_epp_timeout(atppc->sc_dev); for (i = 0; i < atppc->sc_outb_nbytes; i++) { atppc_w_eppD(atppc, *(atppc->sc_outbstart)); atppc_barrier_w(atppc); str = atppc_r_str(atppc); atppc_barrier_r(atppc); if (str & TIMEOUT) { atppc->sc_outerr = EIO; break; } atppc->sc_outbstart++; } } } else { /* Write data block to EPP data register */ atppc_w_eppD_multi(atppc, atppc->sc_outbstart, atppc->sc_outb_nbytes); atppc_barrier_w(atppc); /* Update buffer position, byte count and counter */ atppc->sc_outbstart += atppc->sc_outb_nbytes; } return; } /* Write bytes in ECP/Fast Centronics mode */ static void atppc_fifo_write(struct atppc_softc * const atppc) { unsigned char ctr; unsigned char ecr; const unsigned char ctr_sav = atppc_r_ctr(atppc); const unsigned char ecr_sav = atppc_r_ecr(atppc); ctr = ctr_sav; ecr = ecr_sav; atppc_barrier_r(atppc); /* Reset and flush FIFO */ atppc_w_ecr(atppc, ATPPC_ECR_PS2); atppc_barrier_w(atppc); /* Disable nAck interrupts and initialize port bits */ ctr &= ~(IRQENABLE | STROBE | AUTOFEED); atppc_w_ctr(atppc, ctr); atppc_barrier_w(atppc); /* Restore mode */ atppc_w_ecr(atppc, ecr); atppc_barrier_w(atppc); /* DMA or Programmed IO */ if ((atppc->sc_use & ATPPC_USE_DMA) && (atppc->sc_use & ATPPC_USE_INTR)) { atppc_fifo_write_dma(atppc, ecr, ctr); } else { atppc_fifo_write_pio(atppc, ecr, ctr); } /* Restore original register values */ atppc_w_ctr(atppc, ctr_sav); atppc_w_ecr(atppc, ecr_sav); atppc_barrier_w(atppc); } static void atppc_fifo_write_dma(struct atppc_softc * const atppc, unsigned char ecr, unsigned char ctr) { unsigned int len; unsigned int worklen; for (len = (atppc->sc_outb + atppc->sc_outb_nbytes) - atppc->sc_outbstart; len > 0; len = (atppc->sc_outb + atppc->sc_outb_nbytes) - atppc->sc_outbstart) { /* Wait for device to become ready */ atppc->sc_outerr = atppc_poll_str(atppc, SPP_READY, SPP_MASK); if (atppc->sc_outerr) return; /* Reset chipset for next DMA transfer */ atppc_w_ecr(atppc, ATPPC_ECR_PS2); atppc_barrier_w(atppc); atppc_w_ecr(atppc, ecr); atppc_barrier_w(atppc); /* Limit transfer to maximum DMA size and start it */ worklen = uimin(len, atppc->sc_dma_maxsize); atppc->sc_dmastat = ATPPC_DMA_INIT; atppc->sc_dma_start(atppc, atppc->sc_outbstart, worklen, ATPPC_DMA_MODE_WRITE); atppc->sc_dmastat = ATPPC_DMA_STARTED; /* Enable interrupts, DMA */ ecr &= ~ATPPC_SERVICE_INTR; ecr |= ATPPC_ENABLE_DMA; atppc_w_ecr(atppc, ecr); atppc_barrier_w(atppc); /* Wait for DMA completion */ atppc->sc_outerr = atppc_wait_interrupt(atppc, &atppc->sc_out_cv, ATPPC_IRQ_DMA); if (atppc->sc_outerr) { atppc_fifo_write_error(atppc, worklen); return; } /* Get register value recorded by interrupt handler */ ecr = atppc->sc_ecr_intr; /* Clear DMA programming */ atppc->sc_dma_finish(atppc); atppc->sc_dmastat = ATPPC_DMA_COMPLETE; /* Disable DMA */ ecr &= ~ATPPC_ENABLE_DMA; atppc_w_ecr(atppc, ecr); atppc_barrier_w(atppc); /* Wait for FIFO to empty */ for (;;) { if (ecr & ATPPC_FIFO_EMPTY) { if (ecr & ATPPC_FIFO_FULL) { atppc->sc_outerr = EIO; atppc_fifo_write_error(atppc, worklen); return; } else { break; } } /* Enable service interrupt */ ecr &= ~ATPPC_SERVICE_INTR; atppc_w_ecr(atppc, ecr); atppc_barrier_w(atppc); atppc->sc_outerr = atppc_wait_interrupt(atppc, &atppc->sc_out_cv, ATPPC_IRQ_FIFO); if (atppc->sc_outerr) { atppc_fifo_write_error(atppc, worklen); return; } /* Get register value recorded by interrupt handler */ ecr = atppc->sc_ecr_intr; } /* Update pointer */ atppc->sc_outbstart += worklen; } } static void atppc_fifo_write_pio(struct atppc_softc * const atppc, unsigned char ecr, unsigned char ctr) { unsigned int len; unsigned int worklen; unsigned int timecount; /* Disable DMA */ ecr &= ~ATPPC_ENABLE_DMA; atppc_w_ecr(atppc, ecr); atppc_barrier_w(atppc); for (len = (atppc->sc_outb + atppc->sc_outb_nbytes) - atppc->sc_outbstart; len > 0; len = (atppc->sc_outb + atppc->sc_outb_nbytes) - atppc->sc_outbstart) { /* Wait for device to become ready */ atppc->sc_outerr = atppc_poll_str(atppc, SPP_READY, SPP_MASK); if (atppc->sc_outerr) return; /* Limit transfer to minimum of space in FIFO and buffer */ worklen = uimin(len, atppc->sc_fifo); /* Write to FIFO */ atppc_w_fifo_multi(atppc, atppc->sc_outbstart, worklen); timecount = 0; if (atppc->sc_use & ATPPC_USE_INTR) { ecr = atppc_r_ecr(atppc); atppc_barrier_w(atppc); /* Wait for interrupt */ for (;;) { if (ecr & ATPPC_FIFO_EMPTY) { if (ecr & ATPPC_FIFO_FULL) { atppc->sc_outerr = EIO; atppc_fifo_write_error(atppc, worklen); return; } else { break; } } /* Enable service interrupt */ ecr &= ~ATPPC_SERVICE_INTR; atppc_w_ecr(atppc, ecr); atppc_barrier_w(atppc); atppc->sc_outerr = atppc_wait_interrupt(atppc, &atppc->sc_out_cv, ATPPC_IRQ_FIFO); if (atppc->sc_outerr) { atppc_fifo_write_error(atppc, worklen); return; } /* Get ECR value saved by interrupt handler */ ecr = atppc->sc_ecr_intr; } } else { for (; timecount < ((MAXBUSYWAIT/hz)*1000000); timecount++) { ecr = atppc_r_ecr(atppc); atppc_barrier_r(atppc); if (ecr & ATPPC_FIFO_EMPTY) { if (ecr & ATPPC_FIFO_FULL) { atppc->sc_outerr = EIO; atppc_fifo_write_error(atppc, worklen); return; } else { break; } } DELAY(1); } if (((timecount*hz)/1000000) >= MAXBUSYWAIT) { atppc->sc_outerr = EIO; atppc_fifo_write_error(atppc, worklen); return; } } /* Update pointer */ atppc->sc_outbstart += worklen; } } static void atppc_fifo_write_error(struct atppc_softc * const atppc, const unsigned int worklen) { unsigned char ecr = atppc_r_ecr(atppc); /* Abort DMA if not finished */ if (atppc->sc_dmastat == ATPPC_DMA_STARTED) { atppc->sc_dma_abort(atppc); ATPPC_DPRINTF(("%s: DMA interrupted.\n", __func__)); } /* Check for invalid states */ if ((ecr & ATPPC_FIFO_EMPTY) && (ecr & ATPPC_FIFO_FULL)) { ATPPC_DPRINTF(("%s: FIFO full+empty bits set.\n", __func__)); } else if (!(ecr & ATPPC_FIFO_EMPTY)) { unsigned char ctr = atppc_r_ctr(atppc); int bytes_left; int i; ATPPC_DPRINTF(("%s(%s): FIFO not empty.\n", __func__, device_xname(atppc->sc_dev))); /* Drive strobe low to stop data transfer */ ctr &= ~STROBE; atppc_w_ctr(atppc, ctr); atppc_barrier_w(atppc); /* Determine how many bytes remain in FIFO */ for (i = 0; i < atppc->sc_fifo; i++) { atppc_w_fifo(atppc, (unsigned char)i); ecr = atppc_r_ecr(atppc); atppc_barrier_r(atppc); if (ecr & ATPPC_FIFO_FULL) break; } bytes_left = (atppc->sc_fifo) - (i + 1); ATPPC_DPRINTF(("%s: %d bytes left in FIFO.\n", __func__, bytes_left)); /* Update counter */ atppc->sc_outbstart += (worklen - bytes_left); } else { /* Update counter */ atppc->sc_outbstart += worklen; } ATPPC_DPRINTF(("%s: resetting FIFO.\n", __func__)); atppc_w_ecr(atppc, ATPPC_ECR_PS2); atppc_barrier_w(atppc); } /* * Poll status register using mask and status for MAXBUSYWAIT. * Returns 0 if device ready, error value otherwise. */ static int atppc_poll_str(const struct atppc_softc * const atppc, const u_int8_t status, const u_int8_t mask) { unsigned int timecount; u_int8_t str; int error = EIO; /* Wait for str to have status for MAXBUSYWAIT */ for (timecount = 0; timecount < ((MAXBUSYWAIT/hz)*1000000); timecount++) { str = atppc_r_str(atppc); atppc_barrier_r(atppc); if ((str & mask) == status) { error = 0; break; } DELAY(1); } return error; } /* Wait for interrupt for MAXBUSYWAIT: returns 0 if acknowledge received. */ static int atppc_wait_interrupt(struct atppc_softc * const atppc, kcondvar_t *cv, const u_int8_t irqstat) { int error = EIO; atppc->sc_irqstat &= ~irqstat; /* Wait for interrupt for MAXBUSYWAIT */ error = cv_timedwait_sig(cv, &atppc->sc_lock, MAXBUSYWAIT); if (!(error) && (atppc->sc_irqstat & irqstat)) { atppc->sc_irqstat &= ~irqstat; error = 0; } return error; }