Home | History | Annotate | Line # | Download | only in xscale 
      1 /*	$NetBSD: i80321_i2c.c,v 1.6 2019/12/22 23:23:30 thorpej Exp $	*/
      2 
      3 /*
      4  * Copyright (c) 2003 Wasabi Systems, Inc.
      5  * All rights reserved.
      6  *
      7  * Written by Jason R. Thorpe for Wasabi Systems, Inc.
      8  *
      9  * Redistribution and use in source and binary forms, with or without
     10  * modification, are permitted provided that the following conditions
     11  * are met:
     12  * 1. Redistributions of source code must retain the above copyright
     13  *    notice, this list of conditions and the following disclaimer.
     14  * 2. Redistributions in binary form must reproduce the above copyright
     15  *    notice, this list of conditions and the following disclaimer in the
     16  *    documentation and/or other materials provided with the distribution.
     17  * 3. All advertising materials mentioning features or use of this software
     18  *    must display the following acknowledgement:
     19  *	This product includes software developed for the NetBSD Project by
     20  *	Wasabi Systems, Inc.
     21  * 4. The name of Wasabi Systems, Inc. may not be used to endorse
     22  *    or promote products derived from this software without specific prior
     23  *    written permission.
     24  *
     25  * THIS SOFTWARE IS PROVIDED BY WASABI SYSTEMS, INC. ``AS IS'' AND
     26  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
     27  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
     28  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL WASABI SYSTEMS, INC
     29  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
     30  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
     31  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
     32  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
     33  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
     34  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
     35  * POSSIBILITY OF SUCH DAMAGE.
     36  */
     37 
     38 /*
     39  * Intel i80321 I/O Processor I2C Controller Unit support.
     40  */
     41 
     42 #include <sys/cdefs.h>
     43 __KERNEL_RCSID(0, "$NetBSD: i80321_i2c.c,v 1.6 2019/12/22 23:23:30 thorpej Exp $");
     44 
     45 #include <sys/param.h>
     46 #include <sys/mutex.h>
     47 #include <sys/systm.h>
     48 #include <sys/device.h>
     49 #include <sys/kernel.h>
     50 
     51 #include <sys/bus.h>
     52 #include <machine/intr.h>
     53 
     54 #include <arm/xscale/i80321reg.h>
     55 #include <arm/xscale/i80321var.h>
     56 
     57 #include <dev/i2c/i2cvar.h>
     58 
     59 #include <arm/xscale/iopi2creg.h>
     60 #include <arm/xscale/iopi2cvar.h>
     61 
     62 static int
     63 iic321_match(device_t parent, cfdata_t cf, void *aux)
     64 {
     65 	struct iopxs_attach_args *ia = aux;
     66 
     67 	if (strcmp(cf->cf_name, ia->ia_name) == 0)
     68 		return (1);
     69 
     70 	return (0);
     71 }
     72 
     73 static void
     74 iic321_attach(device_t parent, device_t self, void *aux)
     75 {
     76 	struct iopiic_softc *sc = device_private(self);
     77 	struct iopxs_attach_args *ia = aux;
     78 	int error;
     79 	uint8_t gpio_bits;
     80 
     81 	aprint_naive(": I2C controller\n");
     82 	aprint_normal(": I2C controller\n");
     83 
     84 	sc->sc_dev = self;
     85 	sc->sc_st = ia->ia_st;
     86 	if ((error = bus_space_subregion(sc->sc_st, ia->ia_sh,
     87 					 ia->ia_offset, ia->ia_size,
     88 					 &sc->sc_sh)) != 0) {
     89 		aprint_error_dev(self,
     90 		    "unable to subregion registers, error = %d\n", error);
     91 		return;
     92 	}
     93 
     94 	gpio_bits = (ia->ia_offset == VERDE_I2C_BASE0) ?
     95 	    (1U << 7) | (1U << 6) : (1U << 5) | (1U << 4);
     96 	i80321_gpio_set_val(gpio_bits, 0);
     97 	i80321_gpio_set_direction(gpio_bits, 0);
     98 
     99 	/* XXX Reset the I2C unit? */
    100 
    101 	/* XXX We don't currently use interrupts.  Fix this some day. */
    102 #if 0
    103 	sc->sc_ih = i80321_intr_establish((ia->ia_offset == VERDE_I2C_BASE0) ?
    104 	    ICU_INT_I2C0 : ICU_INT_I2C1, IPL_BIO, iopiic_intr, sc);
    105 	if (sc->sc_ih == NULL) {
    106 		aprint_error_dev(self,
    107 		    "unable to establish interrupt handler\n");
    108 		return;
    109 	}
    110 #endif
    111 
    112 	/*
    113 	 * Enable the I2C unit as a master.
    114 	 * No, we do not support slave mode.
    115 	 */
    116 	sc->sc_icr = IIC_ICR_GCD | IIC_ICR_UE | IIC_ICR_SCLE;
    117 	bus_space_write_4(sc->sc_st, sc->sc_sh, IIC_ICR, 0);
    118 	bus_space_write_4(sc->sc_st, sc->sc_sh, IIC_ISAR, 0);
    119 	bus_space_write_4(sc->sc_st, sc->sc_sh, IIC_ICR, sc->sc_icr);
    120 
    121 	iopiic_attach(sc);
    122 }
    123 
    124 CFATTACH_DECL_NEW(iopiic, sizeof(struct iopiic_softc),
    125     iic321_match, iic321_attach, NULL, NULL);
    126