diff options
Diffstat (limited to 'drivers/scsi/ufs/ufshcd.c')
| -rw-r--r-- | drivers/scsi/ufs/ufshcd.c | 238 |
1 files changed, 235 insertions, 3 deletions
diff --git a/drivers/scsi/ufs/ufshcd.c b/drivers/scsi/ufs/ufshcd.c index ed20156..7b581f7 100644 --- a/drivers/scsi/ufs/ufshcd.c +++ b/drivers/scsi/ufs/ufshcd.c @@ -48,6 +48,14 @@ /* Timeout after 30 msecs if NOP OUT hangs without response */ #define NOP_OUT_TIMEOUT 30 /* msecs */ +/* Query request retries */ +#define QUERY_REQ_RETRIES 10 +/* Query request timeout */ +#define QUERY_REQ_TIMEOUT 30 /* msec */ + +/* Expose the flag value from utp_upiu_query.value */ +#define MASK_QUERY_UPIU_FLAG_LOC 0xFF + enum { UFSHCD_MAX_CHANNEL = 0, UFSHCD_MAX_ID = 1, @@ -341,6 +349,60 @@ static inline void ufshcd_copy_sense_data(struct ufshcd_lrb *lrbp) } /** + * ufshcd_query_to_cpu() - formats the buffer to native cpu endian + * @response: upiu query response to convert + */ +static inline void ufshcd_query_to_cpu(struct utp_upiu_query *response) +{ + response->length = be16_to_cpu(response->length); + response->value = be32_to_cpu(response->value); +} + +/** + * ufshcd_query_to_be() - formats the buffer to big endian + * @request: upiu query request to convert + */ +static inline void ufshcd_query_to_be(struct utp_upiu_query *request) +{ + request->length = cpu_to_be16(request->length); + request->value = cpu_to_be32(request->value); +} + +/** + * ufshcd_copy_query_response() - Copy the Query Response and the data + * descriptor + * @hba: per adapter instance + * @lrb - pointer to local reference block + */ +static +void ufshcd_copy_query_response(struct ufs_hba *hba, struct ufshcd_lrb *lrbp) +{ + struct ufs_query_res *query_res = &hba->dev_cmd.query.response; + + /* Get the UPIU response */ + query_res->response = ufshcd_get_rsp_upiu_result(lrbp->ucd_rsp_ptr) >> + UPIU_RSP_CODE_OFFSET; + + memcpy(&query_res->upiu_res, &lrbp->ucd_rsp_ptr->qr, QUERY_OSF_SIZE); + ufshcd_query_to_cpu(&query_res->upiu_res); + + + /* Get the descriptor */ + if (lrbp->ucd_rsp_ptr->qr.opcode == UPIU_QUERY_OPCODE_READ_DESC) { + u8 *descp = (u8 *)&lrbp->ucd_rsp_ptr + + GENERAL_UPIU_REQUEST_SIZE; + u16 len; + + /* data segment length */ + len = be32_to_cpu(lrbp->ucd_rsp_ptr->header.dword_2) & + MASK_QUERY_DATA_SEG_LEN; + + memcpy(hba->dev_cmd.query.descriptor, descp, + min_t(u16, len, QUERY_DESC_MAX_SIZE)); + } +} + +/** * ufshcd_hba_capabilities - Read controller capabilities * @hba: per adapter instance */ @@ -622,6 +684,45 @@ void ufshcd_prepare_utp_scsi_cmd_upiu(struct ufshcd_lrb *lrbp, u32 upiu_flags) (min_t(unsigned short, lrbp->cmd->cmd_len, MAX_CDB_SIZE))); } +/** + * ufshcd_prepare_utp_query_req_upiu() - fills the utp_transfer_req_desc, + * for query requsts + * @hba: UFS hba + * @lrbp: local reference block pointer + * @upiu_flags: flags + */ +static void ufshcd_prepare_utp_query_req_upiu(struct ufs_hba *hba, + struct ufshcd_lrb *lrbp, u32 upiu_flags) +{ + struct utp_upiu_req *ucd_req_ptr = lrbp->ucd_req_ptr; + struct ufs_query *query = &hba->dev_cmd.query; + u16 len = query->request.upiu_req.length; + u8 *descp = (u8 *)lrbp->ucd_req_ptr + GENERAL_UPIU_REQUEST_SIZE; + + /* Query request header */ + ucd_req_ptr->header.dword_0 = UPIU_HEADER_DWORD( + UPIU_TRANSACTION_QUERY_REQ, upiu_flags, + lrbp->lun, lrbp->task_tag); + ucd_req_ptr->header.dword_1 = UPIU_HEADER_DWORD( + 0, query->request.query_func, 0, 0); + + /* Data segment length */ + ucd_req_ptr->header.dword_2 = UPIU_HEADER_DWORD( + 0, 0, len >> 8, (u8)len); + + /* Copy the Query Request buffer as is */ + memcpy(&ucd_req_ptr->qr, &query->request.upiu_req, + QUERY_OSF_SIZE); + ufshcd_query_to_be(&ucd_req_ptr->qr); + + /* Copy the Descriptor */ + if ((len > 0) && (query->request.upiu_req.opcode == + UPIU_QUERY_OPCODE_WRITE_DESC)) { + memcpy(descp, query->descriptor, + min_t(u16, len, QUERY_DESC_MAX_SIZE)); + } +} + static inline void ufshcd_prepare_utp_nop_upiu(struct ufshcd_lrb *lrbp) { struct utp_upiu_req *ucd_req_ptr = lrbp->ucd_req_ptr; @@ -656,7 +757,10 @@ static int ufshcd_compose_upiu(struct ufs_hba *hba, struct ufshcd_lrb *lrbp) break; case UTP_CMD_TYPE_DEV_MANAGE: ufshcd_prepare_req_desc_hdr(lrbp, &upiu_flags, DMA_NONE); - if (hba->dev_cmd.type == DEV_CMD_TYPE_NOP) + if (hba->dev_cmd.type == DEV_CMD_TYPE_QUERY) + ufshcd_prepare_utp_query_req_upiu( + hba, lrbp, upiu_flags); + else if (hba->dev_cmd.type == DEV_CMD_TYPE_NOP) ufshcd_prepare_utp_nop_upiu(lrbp); else ret = -EINVAL; @@ -800,6 +904,9 @@ ufshcd_dev_cmd_completion(struct ufs_hba *hba, struct ufshcd_lrb *lrbp) __func__, resp); } break; + case UPIU_TRANSACTION_QUERY_RSP: + ufshcd_copy_query_response(hba, lrbp); + break; case UPIU_TRANSACTION_REJECT_UPIU: /* TODO: handle Reject UPIU Response */ err = -EPERM; @@ -889,8 +996,8 @@ static inline void ufshcd_put_dev_cmd_tag(struct ufs_hba *hba, int tag) * @cmd_type - specifies the type (NOP, Query...) * @timeout - time in seconds * - * NOTE: There is only one available tag for device management commands. Thus - * synchronisation is the responsibilty of the user. + * NOTE: Since there is only one available tag for device management commands, + * it is expected you hold the hba->dev_cmd.lock mutex. */ static int ufshcd_exec_dev_cmd(struct ufs_hba *hba, enum dev_cmd_type cmd_type, int timeout) @@ -930,6 +1037,76 @@ out_put_tag: } /** + * ufshcd_query_flag() - API function for sending flag query requests + * hba: per-adapter instance + * query_opcode: flag query to perform + * idn: flag idn to access + * flag_res: the flag value after the query request completes + * + * Returns 0 for success, non-zero in case of failure + */ +static int ufshcd_query_flag(struct ufs_hba *hba, enum query_opcode opcode, + enum flag_idn idn, bool *flag_res) +{ + struct ufs_query_req *request; + struct ufs_query_res *response; + int err; + + BUG_ON(!hba); + + mutex_lock(&hba->dev_cmd.lock); + request = &hba->dev_cmd.query.request; + response = &hba->dev_cmd.query.response; + memset(request, 0, sizeof(struct ufs_query_req)); + memset(response, 0, sizeof(struct ufs_query_res)); + + switch (opcode) { + case UPIU_QUERY_OPCODE_SET_FLAG: + case UPIU_QUERY_OPCODE_CLEAR_FLAG: + case UPIU_QUERY_OPCODE_TOGGLE_FLAG: + request->query_func = UPIU_QUERY_FUNC_STANDARD_WRITE_REQUEST; + break; + case UPIU_QUERY_OPCODE_READ_FLAG: + request->query_func = UPIU_QUERY_FUNC_STANDARD_READ_REQUEST; + if (!flag_res) { + /* No dummy reads */ + dev_err(hba->dev, "%s: Invalid argument for read request\n", + __func__); + err = -EINVAL; + goto out_unlock; + } + break; + default: + dev_err(hba->dev, + "%s: Expected query flag opcode but got = %d\n", + __func__, opcode); + err = -EINVAL; + goto out_unlock; + } + request->upiu_req.opcode = opcode; + request->upiu_req.idn = idn; + + /* Send query request */ + err = ufshcd_exec_dev_cmd(hba, DEV_CMD_TYPE_QUERY, + QUERY_REQ_TIMEOUT); + + if (err) { + dev_err(hba->dev, + "%s: Sending flag query for idn %d failed, err = %d\n", + __func__, idn, err); + goto out_unlock; + } + + if (flag_res) + *flag_res = (response->upiu_res.value & + MASK_QUERY_UPIU_FLAG_LOC) & 0x1; + +out_unlock: + mutex_unlock(&hba->dev_cmd.lock); + return err; +} + +/** * ufshcd_memory_alloc - allocate memory for host memory space data structures * @hba: per adapter instance * @@ -1099,6 +1276,57 @@ static int ufshcd_dme_link_startup(struct ufs_hba *hba) } /** + * ufshcd_complete_dev_init() - checks device readiness + * hba: per-adapter instance + * + * Set fDeviceInit flag and poll until device toggles it. + */ +static int ufshcd_complete_dev_init(struct ufs_hba *hba) +{ + int i, retries, err = 0; + bool flag_res = 1; + + for (retries = QUERY_REQ_RETRIES; retries > 0; retries--) { + /* Set the fDeviceInit flag */ + err = ufshcd_query_flag(hba, UPIU_QUERY_OPCODE_SET_FLAG, + QUERY_FLAG_IDN_FDEVICEINIT, NULL); + if (!err || err == -ETIMEDOUT) + break; + dev_dbg(hba->dev, "%s: error %d retrying\n", __func__, err); + } + if (err) { + dev_err(hba->dev, + "%s setting fDeviceInit flag failed with error %d\n", + __func__, err); + goto out; + } + + /* poll for max. 100 iterations for fDeviceInit flag to clear */ + for (i = 0; i < 100 && !err && flag_res; i++) { + for (retries = QUERY_REQ_RETRIES; retries > 0; retries--) { + err = ufshcd_query_flag(hba, + UPIU_QUERY_OPCODE_READ_FLAG, + QUERY_FLAG_IDN_FDEVICEINIT, &flag_res); + if (!err || err == -ETIMEDOUT) + break; + dev_dbg(hba->dev, "%s: error %d retrying\n", __func__, + err); + } + } + if (err) + dev_err(hba->dev, + "%s reading fDeviceInit flag failed with error %d\n", + __func__, err); + else if (flag_res) + dev_err(hba->dev, + "%s fDeviceInit was not cleared by the device\n", + __func__); + +out: + return err; +} + +/** * ufshcd_make_hba_operational - Make UFS controller operational * @hba: per adapter instance * @@ -1953,6 +2181,10 @@ static void ufshcd_async_scan(void *data, async_cookie_t cookie) if (ret) goto out; + ret = ufshcd_complete_dev_init(hba); + if (ret) + goto out; + scsi_scan_host(hba->host); out: return; |