/* * storage_common.c -- Common definitions for mass storage functionality * * Copyright (C) 2003-2008 Alan Stern * Copyeight (C) 2009 Samsung Electronics * Author: Michal Nazarewicz (m.nazarewicz@samsung.com) * * Ported to u-boot: * Andrzej Pietrasiewicz * * Code refactoring & cleanup: * Łukasz Majewski * * SPDX-License-Identifier: GPL-2.0+ */ /* * This file requires the following identifiers used in USB strings to * be defined (each of type pointer to char): * - fsg_string_manufacturer -- name of the manufacturer * - fsg_string_product -- name of the product * - fsg_string_serial -- product's serial * - fsg_string_config -- name of the configuration * - fsg_string_interface -- name of the interface * The first four are only needed when FSG_DESCRIPTORS_DEVICE_STRINGS * macro is defined prior to including this file. */ /* * When FSG_NO_INTR_EP is defined fsg_fs_intr_in_desc and * fsg_hs_intr_in_desc objects as well as * FSG_FS_FUNCTION_PRE_EP_ENTRIES and FSG_HS_FUNCTION_PRE_EP_ENTRIES * macros are not defined. * * When FSG_NO_DEVICE_STRINGS is defined FSG_STRING_MANUFACTURER, * FSG_STRING_PRODUCT, FSG_STRING_SERIAL and FSG_STRING_CONFIG are not * defined (as well as corresponding entries in string tables are * missing) and FSG_STRING_INTERFACE has value of zero. * * When FSG_NO_OTG is defined fsg_otg_desc won't be defined. */ /* * When FSG_BUFFHD_STATIC_BUFFER is defined when this file is included * the fsg_buffhd structure's buf field will be an array of FSG_BUFLEN * characters rather then a pointer to void. */ /* #include */ /* * Thanks to NetChip Technologies for donating this product ID. * * DO NOT REUSE THESE IDs with any other driver!! Ever!! * Instead: allocate your own, using normal USB-IF procedures. */ #define FSG_VENDOR_ID 0x0525 /* NetChip */ #define FSG_PRODUCT_ID 0xa4a5 /* Linux-USB File-backed Storage Gadget */ /*-------------------------------------------------------------------------*/ #ifndef DEBUG #undef VERBOSE_DEBUG #undef DUMP_MSGS #endif /* !DEBUG */ #ifdef VERBOSE_DEBUG #define VLDBG LDBG #else #define VLDBG(lun, fmt, args...) do { } while (0) #endif /* VERBOSE_DEBUG */ /* #define LDBG(lun, fmt, args...) dev_dbg (&(lun)->dev, fmt, ## args) #define LERROR(lun, fmt, args...) dev_err (&(lun)->dev, fmt, ## args) #define LWARN(lun, fmt, args...) dev_warn(&(lun)->dev, fmt, ## args) #define LINFO(lun, fmt, args...) dev_info(&(lun)->dev, fmt, ## args) */ #define LDBG(lun, fmt, args...) do { } while (0) #define LERROR(lun, fmt, args...) do { } while (0) #define LWARN(lun, fmt, args...) do { } while (0) #define LINFO(lun, fmt, args...) do { } while (0) /* * Keep those macros in sync with those in * include/linux/usb/composite.h or else GCC will complain. If they * are identical (the same names of arguments, white spaces in the * same places) GCC will allow redefinition otherwise (even if some * white space is removed or added) warning will be issued. * * Those macros are needed here because File Storage Gadget does not * include the composite.h header. For composite gadgets those macros * are redundant since composite.h is included any way. * * One could check whether those macros are already defined (which * would indicate composite.h had been included) or not (which would * indicate we were in FSG) but this is not done because a warning is * desired if definitions here differ from the ones in composite.h. * * We want the definitions to match and be the same in File Storage * Gadget as well as Mass Storage Function (and so composite gadgets * using MSF). If someone changes them in composite.h it will produce * a warning in this file when building MSF. */ #define DBG(d, fmt, args...) debug(fmt , ## args) #define VDBG(d, fmt, args...) debug(fmt , ## args) /* #define ERROR(d, fmt, args...) printf(fmt , ## args) */ /* #define WARNING(d, fmt, args...) printf(fmt , ## args) */ /* #define INFO(d, fmt, args...) printf(fmt , ## args) */ /* #define DBG(d, fmt, args...) do { } while (0) */ /* #define VDBG(d, fmt, args...) do { } while (0) */ #define ERROR(d, fmt, args...) do { } while (0) #define WARNING(d, fmt, args...) do { } while (0) #define INFO(d, fmt, args...) do { } while (0) #ifdef DUMP_MSGS /* dump_msg(fsg, const char * label, const u8 * buf, unsigned length); */ # define dump_msg(fsg, label, buf, length) do { \ if (length < 512) { \ DBG(fsg, "%s, length %u:\n", label, length); \ print_hex_dump(KERN_DEBUG, "", DUMP_PREFIX_OFFSET, \ 16, 1, buf, length, 0); \ } \ } while (0) # define dump_cdb(fsg) do { } while (0) #else # define dump_msg(fsg, /* const char * */ label, \ /* const u8 * */ buf, /* unsigned */ length) do { } while (0) # ifdef VERBOSE_DEBUG # define dump_cdb(fsg) \ print_hex_dump(KERN_DEBUG, "SCSI CDB: ", DUMP_PREFIX_NONE, \ 16, 1, (fsg)->cmnd, (fsg)->cmnd_size, 0) \ # else # define dump_cdb(fsg) do { } while (0) # endif /* VERBOSE_DEBUG */ #endif /* DUMP_MSGS */ /*-------------------------------------------------------------------------*/ /* SCSI device types */ #define TYPE_DISK 0x00 #define TYPE_CDROM 0x05 /* USB protocol value = the transport method */ #define USB_PR_CBI 0x00 /* Control/Bulk/Interrupt */ #define USB_PR_CB 0x01 /* Control/Bulk w/o interrupt */ #define USB_PR_BULK 0x50 /* Bulk-only */ /* USB subclass value = the protocol encapsulation */ #define USB_SC_RBC 0x01 /* Reduced Block Commands (flash) */ #define USB_SC_8020 0x02 /* SFF-8020i, MMC-2, ATAPI (CD-ROM) */ #define USB_SC_QIC 0x03 /* QIC-157 (tape) */ #define USB_SC_UFI 0x04 /* UFI (floppy) */ #define USB_SC_8070 0x05 /* SFF-8070i (removable) */ #define USB_SC_SCSI 0x06 /* Transparent SCSI */ /* Bulk-only data structures */ /* Command Block Wrapper */ struct fsg_bulk_cb_wrap { __le32 Signature; /* Contains 'USBC' */ u32 Tag; /* Unique per command id */ __le32 DataTransferLength; /* Size of the data */ u8 Flags; /* Direction in bit 7 */ u8 Lun; /* LUN (normally 0) */ u8 Length; /* Of the CDB, <= MAX_COMMAND_SIZE */ u8 CDB[16]; /* Command Data Block */ }; #define USB_BULK_CB_WRAP_LEN 31 #define USB_BULK_CB_SIG 0x43425355 /* Spells out USBC */ #define USB_BULK_IN_FLAG 0x80 /* Command Status Wrapper */ struct bulk_cs_wrap { __le32 Signature; /* Should = 'USBS' */ u32 Tag; /* Same as original command */ __le32 Residue; /* Amount not transferred */ u8 Status; /* See below */ }; #define USB_BULK_CS_WRAP_LEN 13 #define USB_BULK_CS_SIG 0x53425355 /* Spells out 'USBS' */ #define USB_STATUS_PASS 0 #define USB_STATUS_FAIL 1 #define USB_STATUS_PHASE_ERROR 2 /* Bulk-only class specific requests */ #define USB_BULK_RESET_REQUEST 0xff #define USB_BULK_GET_MAX_LUN_REQUEST 0xfe /* CBI Interrupt data structure */ struct interrupt_data { u8 bType; u8 bValue; }; #define CBI_INTERRUPT_DATA_LEN 2 /* CBI Accept Device-Specific Command request */ #define USB_CBI_ADSC_REQUEST 0x00 /* Length of a SCSI Command Data Block */ #define MAX_COMMAND_SIZE 16 /* SCSI commands that we recognize */ #define SC_FORMAT_UNIT 0x04 #define SC_INQUIRY 0x12 #define SC_MODE_SELECT_6 0x15 #define SC_MODE_SELECT_10 0x55 #define SC_MODE_SENSE_6 0x1a #define SC_MODE_SENSE_10 0x5a #define SC_PREVENT_ALLOW_MEDIUM_REMOVAL 0x1e #define SC_READ_6 0x08 #define SC_READ_10 0x28 #define SC_READ_12 0xa8 #define SC_READ_CAPACITY 0x25 #define SC_READ_FORMAT_CAPACITIES 0x23 #define SC_READ_HEADER 0x44 #define SC_READ_TOC 0x43 #define SC_RELEASE 0x17 #define SC_REQUEST_SENSE 0x03 #define SC_RESERVE 0x16 #define SC_SEND_DIAGNOSTIC 0x1d #define SC_START_STOP_UNIT 0x1b #define SC_SYNCHRONIZE_CACHE 0x35 #define SC_TEST_UNIT_READY 0x00 #define SC_VERIFY 0x2f #define SC_WRITE_6 0x0a #define SC_WRITE_10 0x2a #define SC_WRITE_12 0xaa /* SCSI Sense Key/Additional Sense Code/ASC Qualifier values */ #define SS_NO_SENSE 0 #define SS_COMMUNICATION_FAILURE 0x040800 #define SS_INVALID_COMMAND 0x052000 #define SS_INVALID_FIELD_IN_CDB 0x052400 #define SS_LOGICAL_BLOCK_ADDRESS_OUT_OF_RANGE 0x052100 #define SS_LOGICAL_UNIT_NOT_SUPPORTED 0x052500 #define SS_MEDIUM_NOT_PRESENT 0x023a00 #define SS_MEDIUM_REMOVAL_PREVENTED 0x055302 #define SS_NOT_READY_TO_READY_TRANSITION 0x062800 #define SS_RESET_OCCURRED 0x062900 #define SS_SAVING_PARAMETERS_NOT_SUPPORTED 0x053900 #define SS_UNRECOVERED_READ_ERROR 0x031100 #define SS_WRITE_ERROR 0x030c02 #define SS_WRITE_PROTECTED 0x072700 #define SK(x) ((u8) ((x) >> 16)) /* Sense Key byte, etc. */ #define ASC(x) ((u8) ((x) >> 8)) #define ASCQ(x) ((u8) (x)) struct device_attribute { int i; }; #define ETOOSMALL 525 #include /*-------------------------------------------------------------------------*/ struct fsg_lun { loff_t file_length; loff_t num_sectors; unsigned int initially_ro:1; unsigned int ro:1; unsigned int removable:1; unsigned int cdrom:1; unsigned int prevent_medium_removal:1; unsigned int registered:1; unsigned int info_valid:1; unsigned int nofua:1; u32 sense_data; u32 sense_data_info; u32 unit_attention_data; struct device dev; }; #define fsg_lun_is_open(curlun) ((curlun)->filp != NULL) #if 0 static struct fsg_lun *fsg_lun_from_dev(struct device *dev) { return container_of(dev, struct fsg_lun, dev); } #endif /* Big enough to hold our biggest descriptor */ #define EP0_BUFSIZE 256 #define DELAYED_STATUS (EP0_BUFSIZE + 999) /* An impossibly large value */ /* Number of buffers we will use. 2 is enough for double-buffering */ #define FSG_NUM_BUFFERS 2 /* Default size of buffer length. */ #define FSG_BUFLEN ((u32)16384) /* Maximal number of LUNs supported in mass storage function */ #define FSG_MAX_LUNS 8 enum fsg_buffer_state { BUF_STATE_EMPTY = 0, BUF_STATE_FULL, BUF_STATE_BUSY }; struct fsg_buffhd { #ifdef FSG_BUFFHD_STATIC_BUFFER char buf[FSG_BUFLEN]; #else void *buf; #endif enum fsg_buffer_state state; struct fsg_buffhd *next; /* * The NetChip 2280 is faster, and handles some protocol faults * better, if we don't submit any short bulk-out read requests. * So we will record the intended request length here. */ unsigned int bulk_out_intended_length; struct usb_request *inreq; int inreq_busy; struct usb_request *outreq; int outreq_busy; }; enum fsg_state { /* This one isn't used anywhere */ FSG_STATE_COMMAND_PHASE = -10, FSG_STATE_DATA_PHASE, FSG_STATE_STATUS_PHASE, FSG_STATE_IDLE = 0, FSG_STATE_ABORT_BULK_OUT, FSG_STATE_RESET, FSG_STATE_INTERFACE_CHANGE, FSG_STATE_CONFIG_CHANGE, FSG_STATE_DISCONNECT, FSG_STATE_EXIT, FSG_STATE_TERMINATED }; enum data_direction { DATA_DIR_UNKNOWN = 0, DATA_DIR_FROM_HOST, DATA_DIR_TO_HOST, DATA_DIR_NONE }; /*-------------------------------------------------------------------------*/ static inline u32 get_unaligned_be24(u8 *buf) { return 0xffffff & (u32) get_unaligned_be32(buf - 1); } /*-------------------------------------------------------------------------*/ enum { #ifndef FSG_NO_DEVICE_STRINGS FSG_STRING_MANUFACTURER = 1, FSG_STRING_PRODUCT, FSG_STRING_SERIAL, FSG_STRING_CONFIG, #endif FSG_STRING_INTERFACE }; #ifndef FSG_NO_OTG static struct usb_otg_descriptor fsg_otg_desc = { .bLength = sizeof fsg_otg_desc, .bDescriptorType = USB_DT_OTG, .bmAttributes = USB_OTG_SRP, }; #endif /* There is only one interface. */ static struct usb_interface_descriptor fsg_intf_desc = { .bLength = sizeof fsg_intf_desc, .bDescriptorType = USB_DT_INTERFACE, .bNumEndpoints = 2, /* Adjusted during fsg_bind() */ .bInterfaceClass = USB_CLASS_MASS_STORAGE, .bInterfaceSubClass = USB_SC_SCSI, /* Adjusted during fsg_bind() */ .bInterfaceProtocol = USB_PR_BULK, /* Adjusted during fsg_bind() */ .iInterface = FSG_STRING_INTERFACE, }; /* * Three full-speed endpoint descriptors: bulk-in, bulk-out, and * interrupt-in. */ static struct usb_endpoint_descriptor fsg_fs_bulk_in_desc = { .bLength = USB_DT_ENDPOINT_SIZE, .bDescriptorType = USB_DT_ENDPOINT, .bEndpointAddress = USB_DIR_IN, .bmAttributes = USB_ENDPOINT_XFER_BULK, /* wMaxPacketSize set by autoconfiguration */ }; static struct usb_endpoint_descriptor fsg_fs_bulk_out_desc = { .bLength = USB_DT_ENDPOINT_SIZE, .bDescriptorType = USB_DT_ENDPOINT, .bEndpointAddress = USB_DIR_OUT, .bmAttributes = USB_ENDPOINT_XFER_BULK, /* wMaxPacketSize set by autoconfiguration */ }; #ifndef FSG_NO_INTR_EP static struct usb_endpoint_descriptor fsg_fs_intr_in_desc = { .bLength = USB_DT_ENDPOINT_SIZE, .bDescriptorType = USB_DT_ENDPOINT, .bEndpointAddress = USB_DIR_IN, .bmAttributes = USB_ENDPOINT_XFER_INT, .wMaxPacketSize = cpu_to_le16(2), .bInterval = 32, /* frames -> 32 ms */ }; #ifndef FSG_NO_OTG # define FSG_FS_FUNCTION_PRE_EP_ENTRIES 2 #else # define FSG_FS_FUNCTION_PRE_EP_ENTRIES 1 #endif #endif static struct usb_descriptor_header *fsg_fs_function[] = { #ifndef FSG_NO_OTG (struct usb_descriptor_header *) &fsg_otg_desc, #endif (struct usb_descriptor_header *) &fsg_intf_desc, (struct usb_descriptor_header *) &fsg_fs_bulk_in_desc, (struct usb_descriptor_header *) &fsg_fs_bulk_out_desc, #ifndef FSG_NO_INTR_EP (struct usb_descriptor_header *) &fsg_fs_intr_in_desc, #endif NULL, }; /* * USB 2.0 devices need to expose both high speed and full speed * descriptors, unless they only run at full speed. * * That means alternate endpoint descriptors (bigger packets) * and a "device qualifier" ... plus more construction options * for the configuration descriptor. */ static struct usb_endpoint_descriptor fsg_hs_bulk_in_desc = { .bLength = USB_DT_ENDPOINT_SIZE, .bDescriptorType = USB_DT_ENDPOINT, /* bEndpointAddress copied from fs_bulk_in_desc during fsg_bind() */ .bmAttributes = USB_ENDPOINT_XFER_BULK, .wMaxPacketSize = cpu_to_le16(512), }; static struct usb_endpoint_descriptor fsg_hs_bulk_out_desc = { .bLength = USB_DT_ENDPOINT_SIZE, .bDescriptorType = USB_DT_ENDPOINT, /* bEndpointAddress copied from fs_bulk_out_desc during fsg_bind() */ .bmAttributes = USB_ENDPOINT_XFER_BULK, .wMaxPacketSize = cpu_to_le16(512), .bInterval = 1, /* NAK every 1 uframe */ }; #ifndef FSG_NO_INTR_EP static struct usb_endpoint_descriptor fsg_hs_intr_in_desc = { .bLength = USB_DT_ENDPOINT_SIZE, .bDescriptorType = USB_DT_ENDPOINT, /* bEndpointAddress copied from fs_intr_in_desc during fsg_bind() */ .bmAttributes = USB_ENDPOINT_XFER_INT, .wMaxPacketSize = cpu_to_le16(2), .bInterval = 9, /* 2**(9-1) = 256 uframes -> 32 ms */ }; #ifndef FSG_NO_OTG # define FSG_HS_FUNCTION_PRE_EP_ENTRIES 2 #else # define FSG_HS_FUNCTION_PRE_EP_ENTRIES 1 #endif #endif static struct usb_descriptor_header *fsg_hs_function[] = { #ifndef FSG_NO_OTG (struct usb_descriptor_header *) &fsg_otg_desc, #endif (struct usb_descriptor_header *) &fsg_intf_desc, (struct usb_descriptor_header *) &fsg_hs_bulk_in_desc, (struct usb_descriptor_header *) &fsg_hs_bulk_out_desc, #ifndef FSG_NO_INTR_EP (struct usb_descriptor_header *) &fsg_hs_intr_in_desc, #endif NULL, }; /* Maxpacket and other transfer characteristics vary by speed. */ static struct usb_endpoint_descriptor * fsg_ep_desc(struct usb_gadget *g, struct usb_endpoint_descriptor *fs, struct usb_endpoint_descriptor *hs) { if (gadget_is_dualspeed(g) && g->speed == USB_SPEED_HIGH) return hs; return fs; } /* Static strings, in UTF-8 (for simplicity we use only ASCII characters) */ static struct usb_string fsg_strings[] = { #ifndef FSG_NO_DEVICE_STRINGS {FSG_STRING_MANUFACTURER, fsg_string_manufacturer}, {FSG_STRING_PRODUCT, fsg_string_product}, {FSG_STRING_SERIAL, fsg_string_serial}, {FSG_STRING_CONFIG, fsg_string_config}, #endif {FSG_STRING_INTERFACE, fsg_string_interface}, {} }; static struct usb_gadget_strings fsg_stringtab = { .language = 0x0409, /* en-us */ .strings = fsg_strings, }; /*-------------------------------------------------------------------------*/ /* * If the next two routines are called while the gadget is registered, * the caller must own fsg->filesem for writing. */ static int fsg_lun_open(struct fsg_lun *curlun, const char *filename) { int ro; /* R/W if we can, R/O if we must */ ro = curlun->initially_ro; curlun->ro = ro; curlun->file_length = ums->num_sectors << 9; curlun->num_sectors = ums->num_sectors; debug("open backing file: %s\n", filename); return 0; } static void fsg_lun_close(struct fsg_lun *curlun) { } /*-------------------------------------------------------------------------*/ /* * Sync the file data, don't bother with the metadata. * This code was copied from fs/buffer.c:sys_fdatasync(). */ static int fsg_lun_fsync_sub(struct fsg_lun *curlun) { return 0; } static void store_cdrom_address(u8 *dest, int msf, u32 addr) { if (msf) { /* Convert to Minutes-Seconds-Frames */ addr >>= 2; /* Convert to 2048-byte frames */ addr += 2*75; /* Lead-in occupies 2 seconds */ dest[3] = addr % 75; /* Frames */ addr /= 75; dest[2] = addr % 60; /* Seconds */ addr /= 60; dest[1] = addr; /* Minutes */ dest[0] = 0; /* Reserved */ } else { /* Absolute sector */ put_unaligned_be32(addr, dest); } } /*-------------------------------------------------------------------------*/