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usb_storage: Support 12/16-byte ATA passthrough

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This is an unofficial command that many USB<->ATA chipsets support,
allowing direct passthrough of ATA commands to the device.

We don't pass things through as-is; instead we only intercept and handle
requests for IDENFITY INFO and SMART.  Everything else will return an
error.

Change-Id: I3bbb76990e5f6f0512f6eb42825fa505475b2ecd
This commit is contained in:
Solomon Peachy 2025-09-15 17:41:40 -04:00
parent 14157860b9
commit bb605c91a4
1 changed files with 68 additions and 0 deletions
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68
firmware/usbstack/usb_storage.c
View file

@ -115,6 +115,9 @@
#define SCSI_REPORT_LUNS 0xa0
#define SCSI_WRITE_BUFFER 0x3b
#define SAT_ATA_PASSTHROUGH_12 0xa1
#define SAT_ATA_PASSTHROUGH_16 0x85
#define SCSI_READ_16 0x88
#define SCSI_WRITE_16 0x8a
@ -676,6 +679,31 @@ void usb_storage_transfer_complete(int ep,int dir,int status,int length)
}
}
#if (CONFIG_STORAGE & STORAGE_ATA)
static void usb_storage_send_ata_identify(void)
{
unsigned short* identify_info = ata_get_identify();
for (int i = 0 ; i < ATA_IDENTIFY_WORDS ; i++) {
tb.transfer_buffer[i*2] = identify_info[i] & 0xff;
tb.transfer_buffer[i*2+1] = identify_info[i] >> 8;
}
cur_cmd.count = 0;
cur_cmd.last_result = 0;
send_block_data(cur_cmd.data[0], 512);
}
#ifdef HAVE_ATA_SMART
static void usb_storage_send_smart(void)
{
ata_read_smart((struct ata_smart_values*) tb.transfer_buffer);
cur_cmd.count = 0;
cur_cmd.last_result = 0;
cur_cmd.data[0] = tb.transfer_buffer;
send_block_data(cur_cmd.data[0], 512);
}
#endif /* HAVE_ATA_SMART */
#endif /* STORAGE_ATA */
/* called by usb_core_control_request() */
bool usb_storage_control_request(struct usb_ctrlrequest* req, void* reqdata, unsigned char* dest)
{
@ -1325,6 +1353,46 @@ static void handle_scsi(struct command_block_wrapper* cbw)
break;
#endif /* CONFIG_RTC */
#if (CONFIG_STORAGE & STORAGE_ATA)
case SAT_ATA_PASSTHROUGH_12:
if (cbw->command_block[1] == 0x08 &&
cbw->command_block[2] == 0x0e &&
cbw->command_block[4] == 0x01) {
if (cbw->command_block[9] == 0xa1) { // ??? suspicious
usb_storage_send_ata_identify();
break;
#ifdef HAVE_ATA_SMART
} else if (cbw->command_block[9] == 0xb0) {
usb_storage_send_smart();
break;
#endif
}
}
send_csw(UMS_STATUS_FAIL);
cur_sense_data.sense_key=SENSE_ILLEGAL_REQUEST;
cur_sense_data.asc=ASC_INVALID_COMMAND;
cur_sense_data.ascq=0;
break;
case SAT_ATA_PASSTHROUGH_16:
if (cbw->command_block[1] == 0x08 &&
cbw->command_block[2] == 0x0e &&
cbw->command_block[6] == 0x01) {
if (cbw->command_block[14] == 0xec) {
usb_storage_send_ata_identify();
break;
#ifdef HAVE_ATA_SMART
} else if (cbw->command_block[14] == 0xb0) {
usb_storage_send_smart();
break;
#endif
}
}
send_csw(UMS_STATUS_FAIL);
cur_sense_data.sense_key=SENSE_ILLEGAL_REQUEST;
cur_sense_data.asc=ASC_INVALID_COMMAND;
cur_sense_data.ascq=0;
break;
#endif /* STORAGE_ATA */
default:
logf("scsi unknown cmd %x",cbw->command_block[0x0]);
send_csw(UMS_STATUS_FAIL);