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netwalker_spi.c revision 1.1.6.2 
      1 /*	$NetBSD: netwalker_spi.c,v 1.1.6.2 2014/05/22 11:39:42 yamt Exp $	*/
      2 
      3 /*-
      4  * Copyright (c) 2009  Genetec Corporation.  All rights reserved.
      5  * Written by Hashimoto Kenichi for Genetec Corporation.
      6  *
      7  * Redistribution and use in source and binary forms, with or without
      8  * modification, are permitted provided that the following conditions
      9  * are met:
     10  * 1. Redistributions of source code must retain the above copyright
     11  *    notice, this list of conditions and the following disclaimer.
     12  * 2. Redistributions in binary form must reproduce the above copyright
     13  *    notice, this list of conditions and the following disclaimer in the
     14  *    documentation and/or other materials provided with the distribution.
     15  *
     16  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
     17  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     18  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     19  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
     20  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     21  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     22  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     23  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     24  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     25  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     26  * SUCH DAMAGE.
     27  */
     28 
     29 #include <sys/cdefs.h>
     30 __KERNEL_RCSID(0, "$NetBSD: netwalker_spi.c,v 1.1.6.2 2014/05/22 11:39:42 yamt Exp $");
     31 
     32 #include "opt_imxspi.h"
     33 
     34 #include <sys/param.h>
     35 #include <sys/bus.h>
     36 #include <sys/device.h>
     37 
     38 #include <arm/imx/imx51reg.h>
     39 #include <arm/imx/imx51var.h>
     40 #include <arm/imx/imx51_ccmvar.h>
     41 #include <arm/imx/imx51_ccmreg.h>
     42 #include <arm/imx/imx51_iomuxreg.h>
     43 #include <arm/imx/imxgpiovar.h>
     44 #include <arm/imx/imxspivar.h>
     45 
     46 struct imx51spi_softc {
     47 	struct imxspi_softc	sc_spi;
     48 	struct spi_chipset_tag	sc_tag;
     49 };
     50 
     51 CFATTACH_DECL_NEW(spi_netwalker, sizeof(struct imx51spi_softc),
     52     imxspi_match, imxspi_attach, NULL, NULL);
     53 
     54 static int
     55 imxspi_cs_enable(void *arg, int slave)
     56 {
     57 	switch (slave) {
     58 	case 0:
     59 		gpio_data_write(GPIO_NO(4, 24), 0);
     60 		gpio_set_direction(GPIO_NO(4, 24), GPIO_DIR_OUT);
     61 		break;
     62 	case 1:
     63 		gpio_data_write(GPIO_NO(4, 25), 0);
     64 		gpio_set_direction(GPIO_NO(4, 25), GPIO_DIR_OUT);
     65 		break;
     66 	case 2:
     67 		gpio_data_write(GPIO_NO(3, 0), 0);
     68 		gpio_set_direction(GPIO_NO(3, 0), GPIO_DIR_OUT);
     69 		break;
     70 	}
     71 
     72 	return 0;
     73 }
     74 
     75 static int
     76 imxspi_cs_disable(void *arg, int slave)
     77 {
     78 	switch (slave) {
     79 	case 0:
     80 		gpio_data_write(GPIO_NO(4, 24), 1);
     81 		gpio_set_direction(GPIO_NO(4, 24), GPIO_DIR_IN);
     82 		break;
     83 	case 1:
     84 		gpio_data_write(GPIO_NO(4, 25), 1);
     85 		gpio_set_direction(GPIO_NO(4, 25), GPIO_DIR_IN);
     86 		break;
     87 	case 2:
     88 		gpio_data_write(GPIO_NO(3, 0), 1);
     89 		gpio_set_direction(GPIO_NO(3, 0), GPIO_DIR_IN);
     90 		break;
     91 	}
     92 
     93 	return 0;
     94 }
     95 
     96 int
     97 imxspi_match(device_t parent, cfdata_t cf, void *aux)
     98 {
     99 	if (strcmp(cf->cf_name, "imxspi") == 0)
    100 		return 1;
    101 	if (cf->cf_unit != 0)
    102 		return 1;
    103 
    104 	return 0;
    105 }
    106 
    107 void
    108 imxspi_attach(device_t parent, device_t self, void *aux)
    109 {
    110 	struct imx51spi_softc *sc = device_private(self);
    111 	struct axi_attach_args *aa = aux;
    112 	struct imxspi_attach_args saa;
    113 	int cf_flags = device_cfdata(self)->cf_flags;
    114 
    115 	sc->sc_tag.cookie = sc;
    116 
    117 	if (device_cfdata(self)->cf_unit == 0) {
    118 		/* CS 0 GPIO setting */
    119 		gpio_data_write(GPIO_NO(4, 24), 1);
    120 		gpio_set_direction(GPIO_NO(4, 24), GPIO_DIR_IN);
    121 
    122 		/* CS 1 GPIO setting */
    123 		gpio_data_write(GPIO_NO(4, 25), 1);
    124 		gpio_set_direction(GPIO_NO(4, 25), GPIO_DIR_IN);
    125 
    126 		/* CS 2 */
    127 		/* OJ6SH-T25 Shutdown */
    128 		gpio_data_write(GPIO_NO(3, 14), 0);
    129 		gpio_set_direction(GPIO_NO(3, 14), GPIO_DIR_OUT);
    130 
    131 		/* CS 2 GPIO setting */
    132 		gpio_data_write(GPIO_NO(3, 0), 1);
    133 		gpio_set_direction(GPIO_NO(3, 0), GPIO_DIR_IN);
    134 
    135 		sc->sc_tag.spi_cs_enable = imxspi_cs_enable;
    136 		sc->sc_tag.spi_cs_disable = imxspi_cs_disable;
    137 	}
    138 
    139 	saa.saa_iot = aa->aa_iot;
    140 	saa.saa_addr = aa->aa_addr;
    141 	saa.saa_size = aa->aa_size;
    142 	saa.saa_irq = aa->aa_irq;
    143 	saa.saa_enhanced = cf_flags;
    144 
    145 	saa.saa_nslaves = IMXSPINSLAVES;
    146 	saa.saa_freq = imx51_get_clock(IMX51CLK_CSPI_CLK_ROOT);
    147 	saa.saa_tag = &sc->sc_tag;
    148 
    149 	sc->sc_spi.sc_dev = self;
    150 
    151 	imxspi_attach_common(parent, &sc->sc_spi, &saa);
    152 }
    153