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aupsc.c revision 1.6
      1  1.6   dyoung /* $NetBSD: aupsc.c,v 1.6 2011/07/01 18:39:29 dyoung Exp $ */
      2  1.1    shige 
      3  1.1    shige /*-
      4  1.1    shige  * Copyright (c) 2006 Shigeyuki Fukushima.
      5  1.1    shige  * All rights reserved.
      6  1.1    shige  *
      7  1.1    shige  * Written by Shigeyuki Fukushima.
      8  1.1    shige  *
      9  1.1    shige  * Redistribution and use in source and binary forms, with or without
     10  1.1    shige  * modification, are permitted provided that the following conditions
     11  1.1    shige  * are met:
     12  1.1    shige  * 1. Redistributions of source code must retain the above copyright
     13  1.1    shige  *    notice, this list of conditions and the following disclaimer.
     14  1.1    shige  * 2. Redistributions in binary form must reproduce the above
     15  1.1    shige  *    copyright notice, this list of conditions and the following
     16  1.1    shige  *    disclaimer in the documentation and/or other materials provided
     17  1.1    shige  *    with the distribution.
     18  1.1    shige  * 3. The name of the author may not be used to endorse or promote
     19  1.1    shige  *    products derived from this software without specific prior
     20  1.1    shige  *    written permission.
     21  1.1    shige  *
     22  1.1    shige  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS
     23  1.1    shige  * OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
     24  1.1    shige  * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     25  1.1    shige  * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY
     26  1.1    shige  * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     27  1.1    shige  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE
     28  1.1    shige  * GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
     29  1.1    shige  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
     30  1.1    shige  * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
     31  1.1    shige  * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
     32  1.1    shige  * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
     33  1.1    shige  */
     34  1.1    shige 
     35  1.1    shige #include <sys/cdefs.h>
     36  1.6   dyoung __KERNEL_RCSID(0, "$NetBSD: aupsc.c,v 1.6 2011/07/01 18:39:29 dyoung Exp $");
     37  1.1    shige 
     38  1.1    shige #include "locators.h"
     39  1.1    shige 
     40  1.1    shige #include <sys/param.h>
     41  1.1    shige #include <sys/systm.h>
     42  1.1    shige #include <sys/device.h>
     43  1.1    shige #include <sys/errno.h>
     44  1.1    shige 
     45  1.6   dyoung #include <sys/bus.h>
     46  1.1    shige #include <machine/cpu.h>
     47  1.1    shige 
     48  1.1    shige #include <mips/alchemy/include/aubusvar.h>
     49  1.1    shige #include <mips/alchemy/include/aureg.h>
     50  1.1    shige #include <mips/alchemy/dev/aupscreg.h>
     51  1.1    shige #include <mips/alchemy/dev/aupscvar.h>
     52  1.4    shige #include <mips/alchemy/dev/ausmbus_pscreg.h>
     53  1.1    shige 
     54  1.1    shige struct aupsc_softc {
     55  1.1    shige 	struct device		sc_dev;
     56  1.1    shige 	bus_space_tag_t		sc_bust;
     57  1.1    shige 	bus_space_handle_t	sc_bush;
     58  1.1    shige 	int			sc_pscsel;
     59  1.1    shige };
     60  1.1    shige 
     61  1.1    shige const struct aupsc_proto {
     62  1.1    shige 	const char *name;
     63  1.2    shige 	int protocol;
     64  1.1    shige } aupsc_protos [] = {
     65  1.5  gdamore 	{ "ausmbus", AUPSC_SEL_SMBUS },
     66  1.5  gdamore 	{ "auspi", AUPSC_SEL_SPI },
     67  1.1    shige #if 0
     68  1.1    shige 	{ "auaudio" },
     69  1.1    shige 	{ "aui2s" },
     70  1.1    shige #endif
     71  1.5  gdamore 	{ NULL, AUPSC_SEL_DISABLE }
     72  1.1    shige };
     73  1.1    shige 
     74  1.1    shige static int	aupsc_match(struct device *, struct cfdata *, void *);
     75  1.1    shige static void	aupsc_attach(struct device *, struct device *, void *);
     76  1.2    shige static int	aupsc_submatch(struct device *, struct cfdata *, const int *,
     77  1.2    shige 				void *);
     78  1.2    shige static int	aupsc_print(void *, const char *);
     79  1.2    shige 
     80  1.2    shige static void	aupsc_enable(void *, int);
     81  1.2    shige static void	aupsc_disable(void *);
     82  1.2    shige static void	aupsc_suspend(void *);
     83  1.2    shige 
     84  1.1    shige 
     85  1.1    shige CFATTACH_DECL(aupsc, sizeof(struct aupsc_softc),
     86  1.1    shige 	aupsc_match, aupsc_attach, NULL, NULL);
     87  1.1    shige 
     88  1.1    shige static int
     89  1.1    shige aupsc_match(struct device *parent, struct cfdata *cf, void *aux)
     90  1.1    shige {
     91  1.1    shige 	struct aubus_attach_args *aa = (struct aubus_attach_args *)aux;
     92  1.1    shige 
     93  1.1    shige 	if (strcmp(aa->aa_name, cf->cf_name) != 0)
     94  1.1    shige 		return 0;
     95  1.1    shige 
     96  1.1    shige 	return 1;
     97  1.1    shige }
     98  1.1    shige 
     99  1.1    shige static void
    100  1.1    shige aupsc_attach(struct device *parent, struct device *self, void *aux)
    101  1.1    shige {
    102  1.1    shige 	int i;
    103  1.1    shige 	uint32_t rv;
    104  1.1    shige 	struct aupsc_softc *sc = (struct aupsc_softc *)self;
    105  1.1    shige 	struct aubus_attach_args *aa = (struct aubus_attach_args *)aux;
    106  1.1    shige 	struct aupsc_attach_args pa;
    107  1.2    shige 	struct aupsc_controller ctrl;
    108  1.1    shige 
    109  1.1    shige 	sc->sc_bust = aa->aa_st;
    110  1.1    shige 	if (bus_space_map(sc->sc_bust, aa->aa_addr,
    111  1.1    shige 			AUPSC_SIZE, 0, &sc->sc_bush) != 0) {
    112  1.1    shige 		aprint_normal(": unable to map device registers\n");
    113  1.1    shige 		return;
    114  1.1    shige 	}
    115  1.1    shige 
    116  1.1    shige 	/* Initialize PSC_SEL register */
    117  1.1    shige 	sc->sc_pscsel = AUPSC_SEL_DISABLE;
    118  1.1    shige 	rv = bus_space_read_4(sc->sc_bust, sc->sc_bush, AUPSC_SEL);
    119  1.1    shige 	bus_space_write_4(sc->sc_bust, sc->sc_bush,
    120  1.1    shige 		AUPSC_SEL, (rv & AUPSC_SEL_PS(AUPSC_SEL_DISABLE)));
    121  1.2    shige 	bus_space_write_4(sc->sc_bust, sc->sc_bush,
    122  1.2    shige 		AUPSC_CTRL, AUPSC_CTRL_ENA(AUPSC_CTRL_DISABLE));
    123  1.1    shige 
    124  1.1    shige 	aprint_normal(": Alchemy PSC\n");
    125  1.1    shige 
    126  1.2    shige 	ctrl.psc_bust = sc->sc_bust;
    127  1.2    shige 	ctrl.psc_bush = sc->sc_bush;
    128  1.2    shige 	ctrl.psc_sel = &(sc->sc_pscsel);
    129  1.2    shige 	ctrl.psc_enable = aupsc_enable;
    130  1.2    shige 	ctrl.psc_disable = aupsc_disable;
    131  1.2    shige 	ctrl.psc_suspend = aupsc_suspend;
    132  1.2    shige 	pa.aupsc_ctrl = ctrl;
    133  1.5  gdamore 	pa.aupsc_addr = aa->aa_addr;
    134  1.5  gdamore 	pa.aupsc_irq = aa->aa_irq[0];
    135  1.2    shige 
    136  1.1    shige 	for (i = 0 ; aupsc_protos[i].name != NULL ; i++) {
    137  1.2    shige 		struct aupsc_protocol_device p;
    138  1.2    shige 		uint32_t s;
    139  1.2    shige 
    140  1.1    shige 		pa.aupsc_name = aupsc_protos[i].name;
    141  1.1    shige 
    142  1.2    shige 		p.sc_dev = sc->sc_dev;
    143  1.2    shige 		p.sc_ctrl = ctrl;
    144  1.2    shige 
    145  1.2    shige 		aupsc_enable(&p, aupsc_protos[i].protocol);
    146  1.5  gdamore 		s = bus_space_read_4(sc->sc_bust, sc->sc_bush, AUPSC_STAT);
    147  1.2    shige 		aupsc_disable(&p);
    148  1.2    shige 
    149  1.5  gdamore 		if (s & AUPSC_STAT_SR) {
    150  1.2    shige 			(void) config_found_sm_loc(self, "aupsc", NULL,
    151  1.2    shige 				&pa, aupsc_print, aupsc_submatch);
    152  1.2    shige 		}
    153  1.1    shige         }
    154  1.1    shige }
    155  1.1    shige 
    156  1.1    shige static int
    157  1.1    shige aupsc_submatch(struct device *parent, struct cfdata *cf,
    158  1.1    shige 	const int *ldesc, void *aux)
    159  1.1    shige {
    160  1.1    shige 
    161  1.1    shige 	return config_match(parent, cf, aux);
    162  1.1    shige }
    163  1.1    shige 
    164  1.1    shige static int
    165  1.1    shige aupsc_print(void *aux, const char *pnp)
    166  1.1    shige {
    167  1.5  gdamore 	/*
    168  1.5  gdamore 	 * By default we don't want to print anything, because
    169  1.5  gdamore 	 * otherwise we see complaints about protocols that aren't
    170  1.5  gdamore 	 * configured on every port.  (E.g. each PSC can support 4
    171  1.5  gdamore 	 * protocols, but on a typical design, only one protocol can
    172  1.5  gdamore 	 * be configured per board.)
    173  1.5  gdamore 	 *
    174  1.5  gdamore 	 * Basically, this whole thing should be replaced with an
    175  1.5  gdamore 	 * indirect configuration mechanism.  Direct configuration
    176  1.5  gdamore 	 * doesn't make sense when we absolutely require kernel
    177  1.5  gdamore 	 * configuration to operate.
    178  1.5  gdamore 	 *
    179  1.5  gdamore 	 * Alternatively, a board-specific configuration mechanism
    180  1.5  gdamore 	 * could determine this, and provide direct configuration as
    181  1.5  gdamore 	 * we do for PCMCIA.
    182  1.5  gdamore 	 */
    183  1.1    shige 
    184  1.5  gdamore 	return QUIET;
    185  1.1    shige }
    186  1.2    shige 
    187  1.2    shige static void
    188  1.2    shige aupsc_enable(void *arg, int proto)
    189  1.2    shige {
    190  1.2    shige 	struct aupsc_protocol_device *sc = arg;
    191  1.5  gdamore 	int i;
    192  1.2    shige 
    193  1.2    shige 	/* XXX: (TODO) setting clock AUPSC_SEL_CLK */
    194  1.2    shige 	switch (proto) {
    195  1.2    shige 	case AUPSC_SEL_SPI:
    196  1.2    shige 	case AUPSC_SEL_I2S:
    197  1.2    shige 	case AUPSC_SEL_AC97:
    198  1.2    shige 	case AUPSC_SEL_SMBUS:
    199  1.2    shige 		break;
    200  1.2    shige 	case AUPSC_SEL_DISABLE:
    201  1.2    shige 		aupsc_disable(arg);
    202  1.2    shige 		break;
    203  1.2    shige 	default:
    204  1.2    shige 		printf("%s: aupsc_enable: unsupported protocol.\n",
    205  1.2    shige 			sc->sc_dev.dv_xname);
    206  1.2    shige 		return;
    207  1.2    shige 	}
    208  1.2    shige 
    209  1.2    shige 	if (*(sc->sc_ctrl.psc_sel) != AUPSC_SEL_DISABLE) {
    210  1.2    shige 		printf("%s: aupsc_enable: please disable first.\n",
    211  1.2    shige 			sc->sc_dev.dv_xname);
    212  1.2    shige 		return;
    213  1.2    shige 	}
    214  1.2    shige 
    215  1.2    shige 	bus_space_write_4(sc->sc_ctrl.psc_bust, sc->sc_ctrl.psc_bush,
    216  1.2    shige 			AUPSC_SEL, AUPSC_SEL_PS(proto));
    217  1.2    shige 	bus_space_write_4(sc->sc_ctrl.psc_bust, sc->sc_ctrl.psc_bush,
    218  1.2    shige 			AUPSC_CTRL, AUPSC_CTRL_ENA(AUPSC_CTRL_ENABLE));
    219  1.5  gdamore 
    220  1.5  gdamore 	/* wait up to a whole second, but test every 10us */
    221  1.5  gdamore 	for (i = 1000000; i; i -= 10) {
    222  1.5  gdamore 		if (bus_space_read_4(sc->sc_ctrl.psc_bust,
    223  1.5  gdamore 			sc->sc_ctrl.psc_bush, AUPSC_STAT) & AUPSC_STAT_SR)
    224  1.5  gdamore 			return;
    225  1.5  gdamore 		delay(10);
    226  1.5  gdamore 	}
    227  1.2    shige }
    228  1.2    shige 
    229  1.2    shige static void
    230  1.2    shige aupsc_disable(void *arg)
    231  1.2    shige {
    232  1.2    shige 	struct aupsc_protocol_device *sc = arg;
    233  1.2    shige 
    234  1.2    shige 	bus_space_write_4(sc->sc_ctrl.psc_bust, sc->sc_ctrl.psc_bush,
    235  1.2    shige 			AUPSC_SEL, AUPSC_SEL_PS(AUPSC_SEL_DISABLE));
    236  1.2    shige 	bus_space_write_4(sc->sc_ctrl.psc_bust, sc->sc_ctrl.psc_bush,
    237  1.2    shige 			AUPSC_CTRL, AUPSC_CTRL_ENA(AUPSC_CTRL_DISABLE));
    238  1.2    shige 	delay(1);
    239  1.2    shige }
    240  1.2    shige 
    241  1.2    shige static void
    242  1.2    shige aupsc_suspend(void *arg)
    243  1.2    shige {
    244  1.2    shige 	struct aupsc_protocol_device *sc = arg;
    245  1.2    shige 
    246  1.2    shige 	bus_space_write_4(sc->sc_ctrl.psc_bust, sc->sc_ctrl.psc_bush,
    247  1.2    shige 			AUPSC_CTRL, AUPSC_CTRL_ENA(AUPSC_CTRL_SUSPEND));
    248  1.2    shige 	delay(1);
    249  1.2    shige }
    250