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 --- Changes for v6: sync with new version of "Fix checkpatch warnings about externs in *.c" set all constant disk properties even on not connected drivers
Changes for v5: use common sata extern header - this requires "[PATCH] Fix checkpatch warnings about externs in *.c" to be merged first make sure we have valid callbacks before scanning partitions
Changes for v4: checkpatch fixes use NULLs instead of "" extend sata_loop command
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/sata_loopback.c | 209 ++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 209 insertions(+) create mode 100644 drivers/block/sata_loopback.c
diff --git a/drivers/block/sata_loopback.c b/drivers/block/sata_loopback.c new file mode 100644 index 0000000..b55b270 --- /dev/null +++ b/drivers/block/sata_loopback.c @@ -0,0 +1,209 @@ +/* + * (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 <sata.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"; + +/* this will be auto-initialized to NULLs */ +static char *filenames[CONFIG_SYS_SATA_MAX_DEVICE]; + +static inline int range_check(int dev) +{ + return (dev < 0) || (dev >= CONFIG_SYS_SATA_MAX_DEVICE); +} + +int init_sata(int dev) +{ + block_dev_desc_t *pdev = &sata_dev_desc[dev]; + int fd, old_fd; + + if (range_check(dev)) { + printf("File index %d is out of range.\n", dev); + return -EINVAL; + } + + if (filenames[dev]) + fd = os_open(filenames[dev], OS_O_RDWR); + else + fd = -1; + + old_fd = (long) pdev->priv; + /* This is ugly, but saves allocation for 1 int. */ + pdev->priv = (void *) (long) fd; + + if ((old_fd > 2) || (old_fd < 0)) + os_close(old_fd); + + return 0; +} + +ulong sata_read(int dev, ulong 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; +} + +ulong sata_write(int dev, ulong start, lbaint_t blkcnt, const 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; + char *filename; + lbaint_t bytes = 0; + + if (range_check(dev)) { + printf("File index %d is out of range.\n", dev); + return -EINVAL; + } + + if (filenames[dev]) + filename = filenames[dev]; + else + filename = ""; + + memcpy(pdev->vendor, vendor, sizeof(vendor)); + memcpy(pdev->revision, revision, sizeof(revision)); + namelen = strlen(filename); + + if (namelen > 20) { + /* take the last 17 chars, prepend them with "..." */ + memcpy(pdev->product, "...", 3); + memcpy(pdev->product+3, filename + (namelen - 17), 17); + } else + memcpy(pdev->product, filename, namelen); + + pdev->product[20] = 0; + pdev->type = DEV_TYPE_HARDDISK; + pdev->blksz = ATA_SECT_SIZE; + pdev->lun = 0; + pdev->block_read = sata_read; + pdev->block_write = sata_write; + + bytes = os_lseek(fd, 0, OS_SEEK_END); + if (bytes != -1) { + pdev->lba = bytes/ATA_SECT_SIZE; + printf("SATA loop %d:\nfilename: %s\nsize: %lu\nblock count:" + " %lu\n", dev, filename, bytes, pdev->lba); + } else { + pdev->lba = 0; + printf("SATA loop %d:\nfilename: %s\nFAILED TO OPEN\n", + dev, filename); + } + + return 0; +} + + +int do_loop(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[]) +{ + int dev = 0; + + switch (argc) { + case 0: + case 1: + return CMD_RET_USAGE; + case 2: + if (!strncmp(argv[1], "inf", 3)) { + for (dev = 0; dev < CONFIG_SYS_SATA_MAX_DEVICE; dev++) + scan_sata(dev); + return 0; + } + return CMD_RET_USAGE; + 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); + /* + * init_sata() and scan_sata() do their own range + * check, however we need to explicitly do it here + * as well. + */ + if (range_check(dev)) { + printf("File index %d is out of range.\n", dev); + return -EINVAL; + } + free(filenames[dev]); + filenames[dev] = strdup(argv[3]); + init_sata(dev); + scan_sata(dev); + /* + * Scan the partition table if we succeeded in loading + * the new loop file. + */ + if (sata_dev_desc[dev].lba > 0) + init_part(&sata_dev_desc[dev]); + + return 0; + } + return CMD_RET_USAGE; + } + return CMD_RET_USAGE; +} + +U_BOOT_CMD( + sata_loop, 4, 1, do_loop, + "SATA loopback", + "info - show info about all loop devices\n" + "sata_loop info devnum - show info about loop devnum\n" + "sata_loop load devnum file - load file from host FS into loop devnum" +);