| /* |
| * |
| * Copyright (C) 2012 secunet Security Networks AG |
| * Copyright (C) 2013 Edward O'Callaghan <eocallaghan@alterapraxis.com> |
| * |
| * Redistribution and use in source and binary forms, with or without |
| * modification, are permitted provided that the following conditions |
| * are met: |
| * 1. Redistributions of source code must retain the above copyright |
| * notice, this list of conditions and the following disclaimer. |
| * 2. Redistributions in binary form must reproduce the above copyright |
| * notice, this list of conditions and the following disclaimer in the |
| * documentation and/or other materials provided with the distribution. |
| * 3. The name of the author may not be used to endorse or promote products |
| * derived from this software without specific prior written permission. |
| * |
| * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND |
| * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
| * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
| * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE |
| * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL |
| * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS |
| * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) |
| * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT |
| * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY |
| * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF |
| * SUCH DAMAGE. |
| */ |
| |
| #include <stdlib.h> |
| #include <stdint.h> |
| #include <string.h> |
| #include <libpayload.h> |
| #include <pci.h> |
| #include <storage/ata.h> |
| #include <storage/ahci.h> |
| |
| #include "ahci_private.h" |
| |
| ssize_t ahci_ata_read_sectors(ata_dev_t *const ata_dev, |
| const lba_t start, size_t count, |
| u8 *const buf) |
| { |
| ahci_dev_t *const dev = (ahci_dev_t *)ata_dev; |
| |
| if (count == 0) |
| return 0; |
| |
| if (ata_dev->read_cmd == ATA_READ_DMA) { |
| if (start >= (1 << 28)) { |
| printf("ahci: Sector is not 28-bit addressable.\n"); |
| return -1; |
| } else if (count > 256) { |
| printf("ahci: Sector count too high (max. 256).\n"); |
| count = 256; |
| } |
| #if CONFIG(LP_STORAGE_64BIT_LBA) |
| } else if (ata_dev->read_cmd == ATA_READ_DMA_EXT) { |
| if (start >= (1ULL << 48)) { |
| printf("ahci: Sector is not 48-bit addressable.\n"); |
| return -1; |
| } else if (count > (64 * 1024)) { |
| printf("ahci: Sector count too high (max. 65536).\n"); |
| count = 64 * 1024; |
| } |
| #endif |
| } else { |
| printf("ahci: Unsupported ATA read command (0x%x).\n", |
| ata_dev->read_cmd); |
| return -1; |
| } |
| |
| const size_t bytes = count << ata_dev->sector_size_shift; |
| const size_t bytes_feasible = ahci_cmdslot_prepare(dev, buf, bytes, 0); |
| const size_t sectors = bytes_feasible >> ata_dev->sector_size_shift; |
| |
| dev->cmdtable->fis[ 0] = FIS_HOST_TO_DEVICE; |
| dev->cmdtable->fis[ 1] = FIS_H2D_CMD; |
| dev->cmdtable->fis[ 2] = ata_dev->read_cmd; |
| dev->cmdtable->fis[ 4] = (start >> 0) & 0xff; |
| dev->cmdtable->fis[ 5] = (start >> 8) & 0xff; |
| dev->cmdtable->fis[ 6] = (start >> 16) & 0xff; |
| dev->cmdtable->fis[ 7] = FIS_H2D_DEV_LBA; |
| dev->cmdtable->fis[ 8] = (start >> 24) & 0xff; |
| #if CONFIG(LP_STORAGE_64BIT_LBA) |
| if (ata_dev->read_cmd == ATA_READ_DMA_EXT) { |
| dev->cmdtable->fis[ 9] = (start >> 32) & 0xff; |
| dev->cmdtable->fis[10] = (start >> 40) & 0xff; |
| } |
| #endif |
| dev->cmdtable->fis[12] = (sectors >> 0) & 0xff; |
| dev->cmdtable->fis[13] = (sectors >> 8) & 0xff; |
| |
| if (ahci_cmdslot_exec(dev) < 0) |
| return -1; |
| else |
| return dev->cmdlist->prd_bytes >> ata_dev->sector_size_shift; |
| } |