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sata_subr.c revision 1.6 
      1 /*	$NetBSD: sata_subr.c,v 1.6 2006/11/22 22:14:23 dogcow Exp $	*/
      2 
      3 /*-
      4  * Copyright (c) 2004 The NetBSD Foundation, Inc.
      5  * All rights reserved.
      6  *
      7  * This code is derived from software contributed to The NetBSD Foundation
      8  * by Jason R. Thorpe of Wasabi Systems, Inc.
      9  *
     10  * Redistribution and use in source and binary forms, with or without
     11  * modification, are permitted provided that the following conditions
     12  * are met:
     13  * 1. Redistributions of source code must retain the above copyright
     14  *    notice, this list of conditions and the following disclaimer.
     15  * 2. Redistributions in binary form must reproduce the above copyright
     16  *    notice, this list of conditions and the following disclaimer in the
     17  *    documentation and/or other materials provided with the distribution.
     18  * 3. All advertising materials mentioning features or use of this software
     19  *    must display the following acknowledgement:
     20  *	This product includes software developed by the NetBSD
     21  *	Foundation, Inc. and its contributors.
     22  * 4. Neither the name of The NetBSD Foundation nor the names of its
     23  *    contributors may be used to endorse or promote products derived
     24  *    from this software without specific prior written permission.
     25  *
     26  * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
     27  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
     28  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
     29  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
     30  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
     31  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
     32  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
     33  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
     34  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
     35  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
     36  * POSSIBILITY OF SUCH DAMAGE.
     37  */
     38 
     39 /*
     40  * Common functions for Serial ATA.
     41  */
     42 
     43 #include <sys/param.h>
     44 #include <sys/kernel.h>
     45 #include <sys/proc.h>
     46 #include <sys/device.h>
     47 
     48 #include <dev/ata/satareg.h>
     49 #include <dev/ata/satavar.h>
     50 
     51 /*
     52  * sata_speed:
     53  *
     54  *	Return a string describing the port speed reported by
     55  *	the port's SStatus register.
     56  */
     57 const char *
     58 sata_speed(uint32_t sstatus)
     59 {
     60 	static const char *sata_speedtab[] = {
     61 		"no negotiated speed",
     62 		"1.5Gb/s",
     63 		"3.0GB/s",
     64 		"<unknown 3>",
     65 		"<unknown 4>",
     66 		"<unknown 5>",
     67 		"<unknown 6>",
     68 		"<unknown 7>",
     69 		"<unknown 8>",
     70 		"<unknown 9>",
     71 		"<unknown 10>",
     72 		"<unknown 11>",
     73 		"<unknown 12>",
     74 		"<unknown 13>",
     75 		"<unknown 14>",
     76 		"<unknown 15>",
     77 	};
     78 
     79 	return (sata_speedtab[(sstatus & SStatus_SPD_mask) >>
     80 			      SStatus_SPD_shift]);
     81 }
     82 
     83 /*
     84  * reset the PHY and bring it online
     85  */
     86 uint32_t
     87 sata_reset_interface(struct ata_channel *chp, bus_space_tag_t sata_t,
     88     bus_space_handle_t scontrol_r, bus_space_handle_t sstatus_r)
     89 {
     90 	uint32_t scontrol, sstatus;
     91 	int i;
     92 
     93 	/* bring the PHYs online.
     94 	 * The work-around for errata #1 for the 31244 says that we must
     95 	 * write 0 to the port first to be sure of correctly initializing
     96 	 * the device. It doesn't hurt for other devices.
     97 	 */
     98 	bus_space_write_4(sata_t, scontrol_r, 0, 0);
     99 	scontrol = SControl_IPM_NONE | SControl_SPD_ANY | SControl_DET_INIT;
    100 	bus_space_write_4 (sata_t, scontrol_r, 0, scontrol);
    101 
    102 	tsleep(chp, PRIBIO, "sataup", mstohz(50));
    103 	scontrol &= ~SControl_DET_INIT;
    104 	bus_space_write_4(sata_t, scontrol_r, 0, scontrol);
    105 
    106 	tsleep(chp, PRIBIO, "sataup", mstohz(50));
    107 	/* wait up to 1s for device to come up */
    108 	for (i = 0; i < 100; i++) {
    109 		sstatus = bus_space_read_4(sata_t, sstatus_r, 0);
    110 		if ((sstatus & SStatus_DET_mask) == SStatus_DET_DEV)
    111 			break;
    112 		tsleep(chp, PRIBIO, "sataup", mstohz(10));
    113 	}
    114 
    115 	switch (sstatus & SStatus_DET_mask) {
    116 	case SStatus_DET_NODEV:
    117 		/* No Device; be silent.  */
    118 		break;
    119 
    120 	case SStatus_DET_DEV_NE:
    121 		aprint_error("%s port %d: device connected, but "
    122 		    "communication not established\n",
    123 		    chp->ch_atac->atac_dev.dv_xname, chp->ch_channel);
    124 		break;
    125 
    126 	case SStatus_DET_OFFLINE:
    127 		aprint_error("%s port %d: PHY offline\n",
    128 		    chp->ch_atac->atac_dev.dv_xname, chp->ch_channel);
    129 		break;
    130 
    131 	case SStatus_DET_DEV:
    132 		aprint_normal("%s port %d: device present, speed: %s\n",
    133 		    chp->ch_atac->atac_dev.dv_xname, chp->ch_channel,
    134 		    sata_speed(sstatus));
    135 		break;
    136 	default:
    137 		aprint_error("%s port %d: unknown SStatus: 0x%08x\n",
    138 		    chp->ch_atac->atac_dev.dv_xname, chp->ch_channel,
    139 		    sstatus);
    140 	}
    141 	return(sstatus & SStatus_DET_mask);
    142 }
    143