1 /*
2 *
3 * Copyright (C) 2012 secunet Security Networks AG
4 * Copyright (C) 2013 Edward O'Callaghan <[email protected]>
5 *
6 * Redistribution and use in source and binary forms, with or without
7 * modification, are permitted provided that the following conditions
8 * are met:
9 * 1. Redistributions of source code must retain the above copyright
10 * notice, this list of conditions and the following disclaimer.
11 * 2. Redistributions in binary form must reproduce the above copyright
12 * notice, this list of conditions and the following disclaimer in the
13 * documentation and/or other materials provided with the distribution.
14 * 3. The name of the author may not be used to endorse or promote products
15 * derived from this software without specific prior written permission.
16 *
17 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
20 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
27 * SUCH DAMAGE.
28 */
29
30 #include <stdlib.h>
31 #include <stdint.h>
32 #include <string.h>
33 #include <libpayload.h>
34 #include <pci.h>
35 #include <storage/ata.h>
36 #include <storage/ahci.h>
37
38 #include "ahci_private.h"
39
ahci_packet_read_cmd(atapi_dev_t * const _dev,const u8 * const cmd,const size_t cmdlen,u8 * const buf,const size_t buflen)40 ssize_t ahci_packet_read_cmd(atapi_dev_t *const _dev,
41 const u8 *const cmd, const size_t cmdlen,
42 u8 *const buf, const size_t buflen)
43 {
44 ahci_dev_t *const dev = (ahci_dev_t *)_dev;
45
46 if ((cmdlen != 12) && (cmdlen != 16)) {
47 printf("ahci: Only 12- and 16-byte packet commands allowed.\n");
48 return -1;
49 }
50
51 const size_t len = ahci_cmdslot_prepare(dev, buf, buflen, 0);
52 u16 byte_limit = MIN(len, 63 * 1024); /* like Linux */
53 if (byte_limit & 1) ++byte_limit; /* even limit */
54
55 dev->cmdlist[0].cmd |= CMD_ATAPI;
56 dev->cmdtable->fis[0] = FIS_HOST_TO_DEVICE;
57 dev->cmdtable->fis[1] = FIS_H2D_CMD;
58 dev->cmdtable->fis[2] = ATA_PACKET;
59 dev->cmdtable->fis[5] = byte_limit & 0xff;
60 dev->cmdtable->fis[6] = byte_limit >> 8;
61 memcpy((void *)dev->cmdtable->atapi_cmd, cmd, cmdlen);
62
63 return ahci_cmdslot_exec(dev);
64 }
65