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Annotation of sys/arch/macppc/dev/piic.c, Revision 1.1

1.1     ! nbrk        1: /*     $OpenBSD: piic.c,v 1.2 2007/05/20 23:38:52 thib Exp $   */
        !             2:
        !             3: /*
        !             4:  * Copyright (c) 2005 Mark Kettenis
        !             5:  *
        !             6:  * Permission to use, copy, modify, and distribute this software for any
        !             7:  * purpose with or without fee is hereby granted, provided that the above
        !             8:  * copyright notice and this permission notice appear in all copies.
        !             9:  *
        !            10:  * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
        !            11:  * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
        !            12:  * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
        !            13:  * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
        !            14:  * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
        !            15:  * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
        !            16:  * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
        !            17:  */
        !            18:
        !            19: #include <sys/param.h>
        !            20: #include <sys/systm.h>
        !            21: #include <sys/device.h>
        !            22: #include <sys/rwlock.h>
        !            23: #include <sys/proc.h>
        !            24:
        !            25: #include <machine/autoconf.h>
        !            26:
        !            27: #include <dev/i2c/i2cvar.h>
        !            28:
        !            29: #include <arch/macppc/dev/maci2cvar.h>
        !            30: #include <arch/macppc/dev/pm_direct.h>
        !            31:
        !            32: struct piic_softc {
        !            33:        struct device   sc_dev;
        !            34:
        !            35:        struct rwlock   sc_buslock;
        !            36:        struct i2c_controller sc_i2c_tag;
        !            37: };
        !            38:
        !            39: int     piic_match(struct device *, void *, void *);
        !            40: void    piic_attach(struct device *, struct device *, void *);
        !            41:
        !            42: struct cfattach piic_ca = {
        !            43:        sizeof(struct piic_softc), piic_match, piic_attach
        !            44: };
        !            45:
        !            46: struct cfdriver piic_cd = {
        !            47:         NULL, "piic", DV_DULL,
        !            48: };
        !            49:
        !            50: int    piic_i2c_acquire_bus(void *, int);
        !            51: void   piic_i2c_release_bus(void *, int);
        !            52: int    piic_i2c_exec(void *, i2c_op_t, i2c_addr_t,
        !            53:            const void *, size_t, void *buf, size_t, int);
        !            54:
        !            55: int
        !            56: piic_match(struct device *parent, void *cf, void *aux)
        !            57: {
        !            58:        return (1);
        !            59: }
        !            60:
        !            61: void
        !            62: piic_attach(struct device *parent, struct device *self, void *aux)
        !            63: {
        !            64:        struct piic_softc *sc = (struct piic_softc *)self;
        !            65:        struct confargs *ca = aux;
        !            66:        struct i2cbus_attach_args iba;
        !            67:
        !            68:        printf("\n");
        !            69:
        !            70:        rw_init(&sc->sc_buslock, sc->sc_dev.dv_xname);
        !            71:
        !            72:        sc->sc_i2c_tag.ic_cookie = sc;
        !            73:        sc->sc_i2c_tag.ic_acquire_bus = piic_i2c_acquire_bus;
        !            74:        sc->sc_i2c_tag.ic_release_bus = piic_i2c_release_bus;
        !            75:        sc->sc_i2c_tag.ic_exec = piic_i2c_exec;
        !            76:
        !            77:        bzero(&iba, sizeof iba);
        !            78:        iba.iba_name = "iic";
        !            79:        iba.iba_tag = &sc->sc_i2c_tag;
        !            80:        iba.iba_bus_scan = maciic_scan;
        !            81:        iba.iba_bus_scan_arg = &ca->ca_node;
        !            82:        config_found(&sc->sc_dev, &iba, NULL);
        !            83: }
        !            84:
        !            85: int
        !            86: piic_i2c_acquire_bus(void *cookie, int flags)
        !            87: {
        !            88:        struct piic_softc *sc = cookie;
        !            89:
        !            90:        return (rw_enter(&sc->sc_buslock, RW_WRITE));
        !            91: }
        !            92:
        !            93: void
        !            94: piic_i2c_release_bus(void *cookie, int flags)
        !            95: {
        !            96:        struct piic_softc *sc = cookie;
        !            97:
        !            98:        rw_exit(&sc->sc_buslock);
        !            99: }
        !           100:
        !           101: int
        !           102: piic_i2c_exec(void *cookie, i2c_op_t op, i2c_addr_t addr,
        !           103:     const void *cmdbuf, size_t cmdlen, void *buf, size_t len, int flags)
        !           104: {
        !           105:        u_int8_t pmu_op = PMU_I2C_NORMAL;
        !           106:        int retries = 10;
        !           107:        PMData p;
        !           108:
        !           109:        if (!I2C_OP_STOP_P(op) || cmdlen > 1 || len > 5)
        !           110:                return (EINVAL);
        !           111:
        !           112:        if (cmdlen == 0)
        !           113:                pmu_op = PMU_I2C_SIMPLE;
        !           114:        else if (I2C_OP_READ_P(op))
        !           115:                pmu_op = PMU_I2C_COMBINED;
        !           116:
        !           117:        p.command = PMU_I2C;
        !           118:        p.num_data = 7 + len;
        !           119:        p.s_buf = p.r_buf = p.data;
        !           120:
        !           121:        p.data[0] = addr >> 7;  /* bus number */
        !           122:        p.data[1] = pmu_op;
        !           123:        p.data[2] = 0;
        !           124:        p.data[3] = addr << 1;
        !           125:        p.data[4] = *(u_int8_t *)cmdbuf;
        !           126:        p.data[5] = addr << 1 | I2C_OP_READ_P(op);
        !           127:        p.data[6] = len;
        !           128:        memcpy(&p.data[7], buf, len);
        !           129:
        !           130:        if (pmgrop(&p))
        !           131:                return (EIO);
        !           132:
        !           133:        while (retries--) {
        !           134:                p.command = PMU_I2C;
        !           135:                p.num_data = 1;
        !           136:                p.s_buf = p.r_buf = p.data;
        !           137:                p.data[0] = 0;
        !           138:
        !           139:                if (pmgrop(&p))
        !           140:                        return (EIO);
        !           141:
        !           142:                if (p.data[0] == 1)
        !           143:                        break;
        !           144:
        !           145:                DELAY(10 * 1000);
        !           146:        }
        !           147:
        !           148:        if (I2C_OP_READ_P(op))
        !           149:                memcpy(buf, &p.data[1], len);
        !           150:        return (0);
        !           151: }