/*- * Copyright (c) 2012 The NetBSD Foundation, Inc. * All rights reserved. * * This code is derived from software contributed to The NetBSD Foundation * by Paul Fleischer * * 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 NETBSD FOUNDATION, INC. 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 FOUNDATION 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. */ /* Derived from s3c2410_spi.c */ /* * Copyright (c) 2004 Genetec Corporation. All rights reserved. * Written by Hiroyuki Bessho for Genetec Corporation. * * 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. * 3. The name of Genetec Corporation may not be used to endorse or * promote products derived from this software without specific prior * written permission. * * THIS SOFTWARE IS PROVIDED BY GENETEC CORPORATION ``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 GENETEC CORPORATION * 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. */ /* * Support S3C2440's SPI dirver. * Real works are done by drivers attached to SPI ports. */ #include __KERNEL_RCSID(0, "$NetBSD: s3c2440_spi.c,v 1.2 2012/10/27 17:17:40 chs Exp $"); #include #include #include #include #include #include #include #include #include #include #include #include "locators.h" struct ssspi_softc { bus_space_tag_t iot; bus_space_handle_t ioh; short index; void *sc_ih; struct kmutex sc_intr_mtx; struct kcondvar sc_intr_cv; uint8_t sc_rxbyte; bool sc_received; }; /* prototypes */ static int ssspi_match(device_t, cfdata_t, void *); static void ssspi_attach(device_t, device_t, void *); static int ssspi_search(device_t, cfdata_t, const int *, void *); static int ssspi_print(void *, const char *); int ssspi_intr(void *arg); /* attach structures */ CFATTACH_DECL_NEW(ssspi, sizeof(struct ssspi_softc), ssspi_match, ssspi_attach, NULL, NULL); static int ssspi_print(void *aux, const char *name) { struct ssspi_attach_args *spia = aux; if (spia->spia_aux_intr != SSSPICF_INTR_DEFAULT) printf(" intr %d", spia->spia_aux_intr); return (UNCONF); } int ssspi_match(device_t parent, cfdata_t match, void *aux) { struct s3c2xx0_attach_args *sa = aux; /* S3C2440 have only two SPIs */ switch (sa->sa_index) { case 0: case 1: break; default: return 0; } return 1; } void ssspi_attach(device_t parent, device_t self, void *aux) { struct ssspi_softc *sc = device_private(self); struct s3c2xx0_attach_args *sa = aux; bus_space_tag_t iot = sa->sa_iot; static bus_space_handle_t spi_ioh = 0; /* we map all registers for SPI0 and SPI1 at once, then use subregions */ if (spi_ioh == 0) { if (bus_space_map(iot, S3C2440_SPI0_BASE, 2 * S3C24X0_SPI_SIZE, 0, &spi_ioh)) { aprint_error(": can't map registers\n"); return; } } aprint_normal("\n"); sc->index = sa->sa_index; sc->iot = iot; bus_space_subregion(iot, spi_ioh, sc->index == 0 ? 0 : S3C24X0_SPI_SIZE, S3C24X0_SPI_SIZE, &sc->ioh); mutex_init(&sc->sc_intr_mtx, MUTEX_DEFAULT, IPL_BIO); cv_init(&sc->sc_intr_cv, "S3C2440_spiintr"); /* * Attach child devices */ config_search_ia(ssspi_search, self, "ssspi", NULL); } int ssspi_search(device_t parent, cfdata_t cf, const int *ldesc, void *aux) { struct ssspi_softc *sc = device_private(parent); struct ssspi_attach_args spia; static const unsigned char intr[] = { S3C24X0_INT_SPI0, S3C2440_INT_SPI1 }; KASSERT(sc->index == 0 || sc->index == 1); spia.spia_iot = sc->iot; spia.spia_ioh = sc->ioh; spia.spia_gpioh = s3c2xx0_softc->sc_gpio_ioh; spia.spia_index = sc->index; spia.spia_intr = intr[sc->index]; spia.spia_aux_intr = cf->cf_loc[SSSPICF_INTR]; spia.spia_dmat = s3c2xx0_softc->sc_dmat; if (config_match(parent, cf, &spia)) config_attach(parent, cf, &spia, ssspi_print); return 0; } /* * Intiialze SPI port. called by child devices. */ int s3c24x0_spi_setup(struct ssspi_softc *sc, uint32_t mode, int bps, int use_ss) { int pclk = s3c2xx0_softc->sc_pclk; int prescaler; uint32_t pgcon, pecon, peup; bus_space_handle_t gpioh = s3c2xx0_softc->sc_gpio_ioh; bus_space_tag_t iot = sc->iot; if (bps > 1) { prescaler = pclk / 2 / bps - 1; if (prescaler <= 0 || 0xff < prescaler) return -1; bus_space_write_1(sc->iot, sc->ioh, SPI_SPPRE, prescaler); } if (sc->index == 0) { pecon = bus_space_read_4(iot, gpioh, GPIO_PECON); if (use_ss) { pgcon = bus_space_read_4(iot, gpioh, GPIO_PGCON); pgcon = GPIO_SET_FUNC(pgcon, 2, PCON_ALTFUN2); bus_space_write_4(iot, gpioh, GPIO_PGCON, pgcon); } pecon = GPIO_SET_FUNC(pecon, 11, PCON_ALTFUN); /* SPIMISO0 */ pecon = GPIO_SET_FUNC(pecon, 12, PCON_ALTFUN); /* SPIMOSI0 */ pecon = GPIO_SET_FUNC(pecon, 13, PCON_ALTFUN); /* SPICL0 */ bus_space_write_4(iot, gpioh, GPIO_PECON, pecon); /* Enable pull-up for pin 11, 12, and 13*/ peup = bus_space_read_4(iot, gpioh, GPIO_PEUP); peup &= ~(1<<11); peup &= ~(1<<12); peup &= ~(1<<13); bus_space_write_4(iot, gpioh, GPIO_PEUP, peup); sc->sc_ih = s3c24x0_intr_establish(S3C24X0_INT_SPI0, IPL_BIO, IST_EDGE_RISING, ssspi_intr, sc); printf("ih: %p\n", sc->sc_ih); } else { pgcon = bus_space_read_4(iot, gpioh, GPIO_PGCON); if (use_ss) pgcon = GPIO_SET_FUNC(pgcon, 3, PCON_ALTFUN2); pgcon = GPIO_SET_FUNC(pgcon, 5, PCON_ALTFUN2); /* SPIMISO1 */ pgcon = GPIO_SET_FUNC(pgcon, 6, PCON_ALTFUN2); /* SPIMOSI1 */ pgcon = GPIO_SET_FUNC(pgcon, 7, PCON_ALTFUN2); /* SPICLK1 */ bus_space_write_4(iot, gpioh, GPIO_PGCON, pgcon); /* Enable pull-up for pin 5, 6, and 7*/ peup = bus_space_read_4(iot, gpioh, GPIO_PGUP); peup &= ~(1<<5); peup &= ~(1<<6); peup &= ~(1<<7); bus_space_write_4(iot, gpioh, GPIO_PGUP, peup); } bus_space_write_4(iot, sc->ioh, SPI_SPCON, mode); return 0; } int s3c24x0_spi_master_send(struct ssspi_softc *sc, uint8_t value) { sc->sc_received = FALSE; bus_space_write_1(sc->iot, sc->ioh, SPI_SPTDAT, value); return 0; } void s3c24x0_spi_spin_wait(struct ssspi_softc *sc) { uint32_t reg; do { reg = bus_space_read_4(sc->iot, sc->ioh, SPI_SPSTA); } while(! (reg & SPSTA_REDY)); } int s3c24x0_spi_wait(struct ssspi_softc *sc, uint8_t *valPtr) { #if 0 uint32_t reg; do { reg = bus_space_read_4(sc->iot, sc->ioh, SPI_SPSTA); } while(!(reg & SPSTA_REDY)); #else mutex_enter(&sc->sc_intr_mtx); while( sc->sc_received == FALSE) { cv_wait(&sc->sc_intr_cv, &sc->sc_intr_mtx); } mutex_exit(&sc->sc_intr_mtx); #endif if (valPtr != NULL) { // *valPtr = bus_space_read_1(sc->iot, sc->ioh, SPI_SPRDAT); *valPtr = sc->sc_rxbyte; } return 0; } int s3c24x0_spi_bps(struct ssspi_softc *sc, int bps) { int pclk = s3c2xx0_softc->sc_pclk; int prescaler; if (bps > 1) { prescaler = pclk / 2 / bps - 1; if (prescaler <= 0 || 0xff < prescaler) return -1; bus_space_write_1(sc->iot, sc->ioh, SPI_SPPRE, prescaler); } return 0; } int ssspi_intr(void *arg) { #if 1 uint32_t reg; struct ssspi_softc *sc; sc = (struct ssspi_softc*)arg; reg = bus_space_read_4(sc->iot, sc->ioh, SPI_SPSTA); if (reg & SPSTA_REDY) { sc->sc_rxbyte = bus_space_read_1(sc->iot, sc->ioh, SPI_SPRDAT); mutex_enter(&sc->sc_intr_mtx); sc->sc_received = TRUE; cv_broadcast(&sc->sc_intr_cv); mutex_exit(&sc->sc_intr_mtx); } #endif return 1; }