Home | History | Annotate | Line # | Download | only in imx 
      1 /*	$NetBSD: imx51_iomux.c,v 1.4 2012/10/27 17:17:39 chs Exp $	*/
      2 
      3 /*
      4  * Copyright (c) 2009, 2010  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 GENETEC CORPORATION ``AS IS'' AND
     17  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
     18  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
     19  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL GENETEC CORPORATION
     20  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
     21  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
     22  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
     23  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
     24  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
     25  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
     26  * POSSIBILITY OF SUCH DAMAGE.
     27  */
     28 #include <sys/cdefs.h>
     29 __KERNEL_RCSID(0, "$NetBSD: imx51_iomux.c,v 1.4 2012/10/27 17:17:39 chs Exp $");
     30 
     31 #define	_INTR_PRIVATE
     32 
     33 #include "locators.h"
     34 
     35 #include <sys/param.h>
     36 #include <sys/evcnt.h>
     37 #include <sys/atomic.h>
     38 #include <sys/device.h>
     39 
     40 #include <uvm/uvm_extern.h>
     41 
     42 #include <machine/intr.h>
     43 
     44 #include <arm/cpu.h>
     45 #include <arm/armreg.h>
     46 #include <arm/cpufunc.h>
     47 
     48 #include <sys/bus.h>
     49 
     50 #include <arm/imx/imx51reg.h>
     51 #include <arm/imx/imx51var.h>
     52 
     53 struct iomux_softc {
     54 	bus_space_tag_t iomux_memt;
     55 	bus_space_handle_t iomux_memh;
     56 };
     57 
     58 #define	IOMUX_READ(iomux, reg) \
     59 	bus_space_read_4((iomux)->iomux_memt, (iomux)->iomux_memh, (reg))
     60 #define	IOMUX_WRITE(iomux, reg, val) \
     61 	bus_space_write_4((iomux)->iomux_memt, (iomux)->iomux_memh, (reg), (val))
     62 
     63 static int iomux_match(device_t, cfdata_t, void *);
     64 static void iomux_attach(device_t, device_t, void *);
     65 
     66 static struct iomux_softc *iomuxsc = NULL;
     67 
     68 CFATTACH_DECL_NEW(imxiomux, sizeof(struct iomux_softc),
     69     iomux_match, iomux_attach, NULL, NULL);
     70 
     71 int
     72 iomux_match(device_t parent, cfdata_t cfdata, void *aux)
     73 {
     74 	struct axi_attach_args *axia = aux;
     75 
     76 	if (axia->aa_addr != IOMUXC_BASE)
     77 		return 0;
     78 
     79 	return 1;
     80 }
     81 
     82 void
     83 iomux_attach(device_t parent, device_t self, void *aux)
     84 {
     85 	struct axi_attach_args * const axia = aux;
     86 	struct iomux_softc * const iomux = device_private(self);
     87 	int error;
     88 
     89 	if (axia->aa_size == AXICF_SIZE_DEFAULT)
     90 		axia->aa_size = IOMUXC_SIZE;
     91 
     92 	iomux->iomux_memt = axia->aa_iot;
     93 	error = bus_space_map(axia->aa_iot, axia->aa_addr, axia->aa_size,
     94 			      0, &iomux->iomux_memh);
     95 
     96 	if (error) {
     97 		aprint_error(": failed to map register %#lx@%#lx: %d\n",
     98 		    axia->aa_size, axia->aa_addr, error);
     99 		return;
    100 	}
    101 
    102 	aprint_normal("\n");
    103 
    104 	iomuxsc = iomux;
    105 }
    106 
    107 static void
    108 iomux_set_function_sub(struct iomux_softc *sc, uint32_t pin, uint32_t fn)
    109 {
    110 	bus_size_t mux_ctl_reg = IOMUX_PIN_TO_MUX_ADDRESS(pin);
    111 
    112 	if (mux_ctl_reg != IOMUX_MUX_NONE)
    113 		bus_space_write_4(sc->iomux_memt, sc->iomux_memh,
    114 		    mux_ctl_reg, fn);
    115 }
    116 
    117 void
    118 iomux_set_function(unsigned int pin, unsigned int fn)
    119 {
    120 	iomux_set_function_sub(iomuxsc, pin, fn);
    121 }
    122 
    123 
    124 static void
    125 iomux_set_pad_sub(struct iomux_softc *sc, uint32_t pin, uint32_t config)
    126 {
    127 	bus_size_t pad_ctl_reg = IOMUX_PIN_TO_PAD_ADDRESS(pin);
    128 
    129 	if (pad_ctl_reg != IOMUX_PAD_NONE)
    130 		bus_space_write_4(sc->iomux_memt, sc->iomux_memh,
    131 		    pad_ctl_reg, config);
    132 }
    133 
    134 void
    135 iomux_set_pad(unsigned int pin, unsigned int config)
    136 {
    137 	iomux_set_pad_sub(iomuxsc, pin, config);
    138 }
    139 
    140 #if 0
    141 void
    142 iomux_set_input(unsigned int input, unsigned int config)
    143 {
    144 	bus_size_t input_ctl_reg = input;
    145 
    146 	bus_space_write_4(iomuxsc->iomux_memt, iomuxsc->iomux_memh,
    147 	    input_ctl_reg, config);
    148 }
    149 #endif
    150 
    151 void
    152 iomux_mux_config(const struct iomux_conf *conflist)
    153 {
    154 	int i;
    155 
    156 	for (i = 0; conflist[i].pin != IOMUX_CONF_EOT; i++) {
    157 		iomux_set_pad_sub(iomuxsc, conflist[i].pin, conflist[i].pad);
    158 		iomux_set_function_sub(iomuxsc, conflist[i].pin,
    159 		    conflist[i].mux);
    160 	}
    161 }
    162 
    163 #if 0
    164 void
    165 iomux_input_config(const struct iomux_input_conf *conflist)
    166 {
    167 	int i;
    168 
    169 	for (i = 0; conflist[i].inout != -1; i++) {
    170 		iomux_set_inout(iomuxsc, conflist[i].inout,
    171 		    conflist[i].inout_mode);
    172 	}
    173 }
    174 #endif
    175 
    176