This driver uses files as block devices, can be used for testing disk operations on sandbox. A new command "sata_loop" is introduced to load files in runtime.
Signed-off-by: Pavel Herrmann morpheus.ibis@gmail.com CC: Marek Vasut marex@denx.de CC: Mike Frysinger vapier@gentoo.org --- Changes for v3: introduce sata_loop command
Changes for v2: split sandbox config off into separate patch (2/2) rename file to signify exported API style fixes show end of long filenames rather than beginning check for lseek errors to indicate non-regular file
drivers/block/Makefile | 1 + drivers/block/sata_loopback.c | 200 ++++++++++++++++++++++++++++++++++++++++++ 2 files changed, 201 insertions(+) create mode 100644 drivers/block/sata_loopback.c
diff --git a/drivers/block/Makefile b/drivers/block/Makefile index f1ebdcc..c95651a 100644 --- a/drivers/block/Makefile +++ b/drivers/block/Makefile @@ -40,6 +40,7 @@ COBJS-$(CONFIG_SATA_SIL) += sata_sil.o COBJS-$(CONFIG_IDE_SIL680) += sil680.o COBJS-$(CONFIG_SCSI_SYM53C8XX) += sym53c8xx.o COBJS-$(CONFIG_SYSTEMACE) += systemace.o +COBJS-${CONFIG_SATA_LOOP} += sata_loopback.o
COBJS := $(COBJS-y) SRCS := $(COBJS:.o=.c) diff --git a/drivers/block/sata_loopback.c b/drivers/block/sata_loopback.c new file mode 100644 index 0000000..0e6923b --- /dev/null +++ b/drivers/block/sata_loopback.c @@ -0,0 +1,200 @@ +/* + * (C) Copyright 2012 + * Pavel Herrmann morpheus.ibis@gmail.com + * + * See file CREDITS for list of people who contributed to this + * project. + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of the GNU General Public License as + * published by the Free Software Foundation; either version 2 of + * the License, or (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, write to the Free Software + * Foundation, Inc., 59 Temple Place, Suite 330, Boston, + * MA 02111-1307 USA + */ + +#include <common.h> +#include <part.h> +#include <ata.h> +#include <libata.h> +#include <errno.h> +#include <os.h> +#include <command.h> +#include <malloc.h> + +static const char revision[] = "0.0"; +static const char vendor[] = "SATA loopback"; + +static char * filenames[CONFIG_SYS_SATA_MAX_DEVICE]; + +extern block_dev_desc_t sata_dev_desc[]; + +int init_sata(int dev) +{ + static int zeroed = 0; + block_dev_desc_t *pdev = &sata_dev_desc[dev]; + int fd, old_fd; + + + if (!zeroed) { + int i; + for (i = 0; i < CONFIG_SYS_SATA_MAX_DEVICE; i++) + filenames[i]=strdup(""); + zeroed = 1; + } + + if ((dev < 0) || (dev >= CONFIG_SYS_SATA_MAX_DEVICE)) { + printf("File index %d is out of range.\n", dev); + return -EINVAL; + } + + fd = os_open(filenames[dev], OS_O_RDWR); + /* This is ugly, but saves allocation for 1 int. */ + old_fd = (long) pdev->priv; + pdev->priv = (void *) (long) fd; + /* + * sadly we cannot set -1 to all as above, because "sata init" will zero + * this value before calling sata_init. + */ + if ((old_fd > 2) || (old_fd < 0)) + os_close(old_fd); + + return 0; +} + +lbaint_t sata_read(int dev, lbaint_t start, lbaint_t blkcnt, void *buffer) +{ + block_dev_desc_t *pdev = &sata_dev_desc[dev]; + int fd = (long) pdev->priv; + lbaint_t start_byte = ATA_SECT_SIZE * start; + lbaint_t length_byte = ATA_SECT_SIZE * blkcnt; + lbaint_t retval; + + if ( os_lseek(fd, start_byte, OS_SEEK_SET) != start_byte) + return -1; + + retval = os_read(fd, buffer, length_byte); + + return retval/ATA_SECT_SIZE; +} + +lbaint_t sata_write(int dev, lbaint_t start, lbaint_t blkcnt, void *buffer) +{ + block_dev_desc_t *pdev = &sata_dev_desc[dev]; + int fd = (long) pdev->priv; + lbaint_t start_byte = ATA_SECT_SIZE * start; + lbaint_t length_byte = ATA_SECT_SIZE * blkcnt; + lbaint_t retval; + + if ( os_lseek(fd, start_byte, OS_SEEK_SET) != start_byte) + return -1; + + retval = os_write(fd, buffer, length_byte); + + return retval/ATA_SECT_SIZE; +} + +int scan_sata(int dev) +{ + block_dev_desc_t *pdev = &sata_dev_desc[dev]; + int fd = (long) pdev->priv; + int namelen; + const char *filename = filenames[dev]; + lbaint_t bytes = 0; + + if ((dev < 0) || (dev >= CONFIG_SYS_SATA_MAX_DEVICE)) { + printf("File index %d is out of range.\n", dev); + return -EINVAL; + } + + memcpy(pdev->vendor, vendor, sizeof(vendor)); + memcpy(pdev->revision, revision, sizeof(revision)); + namelen = strlen(filenames[dev]); + + if (namelen > 20) { + /* take the last 17 chars, prepend them with "..." */ + filename += (namelen - 17); + memcpy(pdev->product, "...", 3); + memcpy(pdev->product+3, filename, 17); + } else + memcpy(pdev->product, filename, namelen); + + pdev->product[20] = 0; + + bytes = os_lseek(fd, 0, OS_SEEK_END); + if (bytes != -1) { + pdev->type = DEV_TYPE_HARDDISK; + pdev->blksz = ATA_SECT_SIZE; + pdev->lun = 0; + pdev->lba = bytes/ATA_SECT_SIZE; + printf("SATA loop %d:\nfilename: %s\nsize: %lu\nblock count:" + " %lu\n", dev, filenames[dev], bytes, pdev->lba); + } else { + pdev->type = DEV_TYPE_HARDDISK; + pdev->blksz = ATA_SECT_SIZE; + pdev->lun = 0; + pdev->lba = 0; + printf("SATA loop %d:\nfilename: %s\nFAILED TO OPEN\n", + dev, filenames[dev]); + } + + return 0; +} + + +int do_loop(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[]) +{ + int dev = 0; + static int zeroed = 0; + + /* make sure we have valid filenames */ + if (!zeroed) { + init_sata(0); + zeroed = 1; + } + + switch (argc) { + case 0: + case 1: + return CMD_RET_USAGE; + case 2: + dev = simple_strtoul(argv[1], NULL, 10); + return scan_sata(dev); + + case 3: + if (!strncmp(argv[1], "inf", 3)) { + dev = simple_strtoul(argv[2], NULL, 10); + return scan_sata(dev); + } + return CMD_RET_USAGE; + case 4: + if (!strncmp(argv[1], "load", 4)) { + dev = simple_strtoul(argv[2], NULL, 10); + if ((dev < 0) || (dev >= CONFIG_SYS_SATA_MAX_DEVICE)) { + printf("File index %d is out of range.\n", dev); + return -EINVAL; + } + free(filenames[dev]); + filenames[dev] = strdup(argv[3]); + init_sata(dev); + return scan_sata(dev); + } + return CMD_RET_USAGE; + } + return CMD_RET_USAGE; +} + +U_BOOT_CMD( + sata_loop, 4, 1, do_loop, + "SATA loopback", + "[info] devnum - show info about loop devnum\n" + "sata_loop load devnum file - load file from host FS into loop devnum" +);