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      1 /*	$NetBSD: i80312_i2c.c,v 1.7 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: i80312_i2c.c,v 1.7 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/i80312var.h>
     55 
     56 #include <dev/i2c/i2cvar.h>
     57 
     58 #include <arm/xscale/iopi2cvar.h>
     59 #include <arm/xscale/iopi2creg.h>
     60 
     61 static int
     62 iic312_match(device_t parent, cfdata_t cf, void *aux)
     63 {
     64 	struct iopxs_attach_args *ia = aux;
     65 
     66 	if (strcmp(cf->cf_name, ia->ia_name) == 0)
     67 		return (1);
     68 
     69 	return (0);
     70 }
     71 
     72 static void
     73 iic312_attach(device_t parent, device_t self, void *aux)
     74 {
     75 	struct iopiic_softc *sc = device_private(self);
     76 	struct iopxs_attach_args *ia = aux;
     77 	int error;
     78 
     79 	aprint_naive(": I2C controller\n");
     80 	aprint_normal(": I2C controller\n");
     81 
     82 	sc->sc_dev = self;
     83 	sc->sc_st = ia->ia_st;
     84 	if ((error = bus_space_subregion(sc->sc_st, ia->ia_sh,
     85 					 ia->ia_offset, ia->ia_size,
     86 					 &sc->sc_sh)) != 0) {
     87 		aprint_error_dev(self,
     88 		    "unable to subregion registers, error = %d\n", error);
     89 		return;
     90 	}
     91 
     92 	/* XXX Reset the I2C unit? */
     93 
     94 	/* XXX We don't currently use interrupts.  Fix this some day. */
     95 #if 0
     96 	sc->sc_ih = i80321_intr_establish(ICU_INT_I2C, IPL_BIO,
     97 					  iopiic_intr, sc);
     98 	if (sc->sc_ih == NULL) {
     99 		aprint_error_dev(self,
    100 		    "unable to establish interrupt handler\n");
    101 		return;
    102 	}
    103 #endif
    104 
    105 	/*
    106 	 * Enable the I2C unit as a master running at 100.0 kHz (ICCR=0x1f4
    107 	 * per p.12-8 of the i80312 developer's manual).
    108 	 * No, we do not support slave mode.
    109 	 */
    110 	sc->sc_icr = IIC_ICR_GCD | IIC_ICR_UE | IIC_ICR_SCLE;
    111 	bus_space_write_4(sc->sc_st, sc->sc_sh, IIC_ICR, 0);
    112 	bus_space_write_4(sc->sc_st, sc->sc_sh, IIC_ICCR, 0x1f4);
    113 	bus_space_write_4(sc->sc_st, sc->sc_sh, IIC_ISAR, 0);
    114 	bus_space_write_4(sc->sc_st, sc->sc_sh, IIC_ICR, sc->sc_icr);
    115 
    116 	iopiic_attach(sc);
    117 }
    118 
    119 CFATTACH_DECL_NEW(iopiic, sizeof(struct iopiic_softc),
    120     iic312_match, iic312_attach, NULL, NULL);
    121