diff options
Diffstat (limited to 'drivers/scsi/ufs/ufshcd.c')
| -rw-r--r-- | drivers/scsi/ufs/ufshcd.c | 1978 |
1 files changed, 1978 insertions, 0 deletions
diff --git a/drivers/scsi/ufs/ufshcd.c b/drivers/scsi/ufs/ufshcd.c new file mode 100644 index 00000000000..52b96e8bf92 --- /dev/null +++ b/drivers/scsi/ufs/ufshcd.c @@ -0,0 +1,1978 @@ +/* + * Universal Flash Storage Host controller driver + * + * This code is based on drivers/scsi/ufs/ufshcd.c + * Copyright (C) 2011-2012 Samsung India Software Operations + * + * Santosh Yaraganavi <santosh.sy@samsung.com> + * Vinayak Holikatti <h.vinayak@samsung.com> + * + * 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. + * + * NO WARRANTY + * THE PROGRAM IS PROVIDED ON AN "AS IS" BASIS, WITHOUT WARRANTIES OR + * CONDITIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED INCLUDING, WITHOUT + * LIMITATION, ANY WARRANTIES OR CONDITIONS OF TITLE, NON-INFRINGEMENT, + * MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE. Each Recipient is + * solely responsible for determining the appropriateness of using and + * distributing the Program and assumes all risks associated with its + * exercise of rights under this Agreement, including but not limited to + * the risks and costs of program errors, damage to or loss of data, + * programs or equipment, and unavailability or interruption of operations. + + * DISCLAIMER OF LIABILITY + * NEITHER RECIPIENT NOR ANY CONTRIBUTORS SHALL HAVE ANY LIABILITY FOR ANY + * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL + * DAMAGES (INCLUDING WITHOUT LIMITATION LOST PROFITS), HOWEVER CAUSED AND + * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR + * TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE + * USE OR DISTRIBUTION OF THE PROGRAM OR THE EXERCISE OF ANY RIGHTS GRANTED + * HEREUNDER, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGES + + * 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., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, + * USA. + */ + +#include <linux/module.h> +#include <linux/kernel.h> +#include <linux/init.h> +#include <linux/pci.h> +#include <linux/interrupt.h> +#include <linux/io.h> +#include <linux/delay.h> +#include <linux/slab.h> +#include <linux/spinlock.h> +#include <linux/workqueue.h> +#include <linux/errno.h> +#include <linux/types.h> +#include <linux/wait.h> +#include <linux/bitops.h> + +#include <asm/irq.h> +#include <asm/byteorder.h> +#include <scsi/scsi.h> +#include <scsi/scsi_cmnd.h> +#include <scsi/scsi_host.h> +#include <scsi/scsi_tcq.h> +#include <scsi/scsi_dbg.h> +#include <scsi/scsi_eh.h> + +#include "ufs.h" +#include "ufshci.h" + +#define UFSHCD "ufshcd" +#define UFSHCD_DRIVER_VERSION "0.1" + +enum { + UFSHCD_MAX_CHANNEL = 0, + UFSHCD_MAX_ID = 1, + UFSHCD_MAX_LUNS = 8, + UFSHCD_CMD_PER_LUN = 32, + UFSHCD_CAN_QUEUE = 32, +}; + +/* UFSHCD states */ +enum { + UFSHCD_STATE_OPERATIONAL, + UFSHCD_STATE_RESET, + UFSHCD_STATE_ERROR, +}; + +/* Interrupt configuration options */ +enum { + UFSHCD_INT_DISABLE, + UFSHCD_INT_ENABLE, + UFSHCD_INT_CLEAR, +}; + +/* Interrupt aggregation options */ +enum { + INT_AGGR_RESET, + INT_AGGR_CONFIG, +}; + +/** + * struct uic_command - UIC command structure + * @command: UIC command + * @argument1: UIC command argument 1 + * @argument2: UIC command argument 2 + * @argument3: UIC command argument 3 + * @cmd_active: Indicate if UIC command is outstanding + * @result: UIC command result + */ +struct uic_command { + u32 command; + u32 argument1; + u32 argument2; + u32 argument3; + int cmd_active; + int result; +}; + +/** + * struct ufs_hba - per adapter private structure + * @mmio_base: UFSHCI base register address + * @ucdl_base_addr: UFS Command Descriptor base address + * @utrdl_base_addr: UTP Transfer Request Descriptor base address + * @utmrdl_base_addr: UTP Task Management Descriptor base address + * @ucdl_dma_addr: UFS Command Descriptor DMA address + * @utrdl_dma_addr: UTRDL DMA address + * @utmrdl_dma_addr: UTMRDL DMA address + * @host: Scsi_Host instance of the driver + * @pdev: PCI device handle + * @lrb: local reference block + * @outstanding_tasks: Bits representing outstanding task requests + * @outstanding_reqs: Bits representing outstanding transfer requests + * @capabilities: UFS Controller Capabilities + * @nutrs: Transfer Request Queue depth supported by controller + * @nutmrs: Task Management Queue depth supported by controller + * @active_uic_cmd: handle of active UIC command + * @ufshcd_tm_wait_queue: wait queue for task management + * @tm_condition: condition variable for task management + * @ufshcd_state: UFSHCD states + * @int_enable_mask: Interrupt Mask Bits + * @uic_workq: Work queue for UIC completion handling + * @feh_workq: Work queue for fatal controller error handling + * @errors: HBA errors + */ +struct ufs_hba { + void __iomem *mmio_base; + + /* Virtual memory reference */ + struct utp_transfer_cmd_desc *ucdl_base_addr; + struct utp_transfer_req_desc *utrdl_base_addr; + struct utp_task_req_desc *utmrdl_base_addr; + + /* DMA memory reference */ + dma_addr_t ucdl_dma_addr; + dma_addr_t utrdl_dma_addr; + dma_addr_t utmrdl_dma_addr; + + struct Scsi_Host *host; + struct pci_dev *pdev; + + struct ufshcd_lrb *lrb; + + unsigned long outstanding_tasks; + unsigned long outstanding_reqs; + + u32 capabilities; + int nutrs; + int nutmrs; + u32 ufs_version; + + struct uic_command active_uic_cmd; + wait_queue_head_t ufshcd_tm_wait_queue; + unsigned long tm_condition; + + u32 ufshcd_state; + u32 int_enable_mask; + + /* Work Queues */ + struct work_struct uic_workq; + struct work_struct feh_workq; + + /* HBA Errors */ + u32 errors; +}; + +/** + * struct ufshcd_lrb - local reference block + * @utr_descriptor_ptr: UTRD address of the command + * @ucd_cmd_ptr: UCD address of the command + * @ucd_rsp_ptr: Response UPIU address for this command + * @ucd_prdt_ptr: PRDT address of the command + * @cmd: pointer to SCSI command + * @sense_buffer: pointer to sense buffer address of the SCSI command + * @sense_bufflen: Length of the sense buffer + * @scsi_status: SCSI status of the command + * @command_type: SCSI, UFS, Query. + * @task_tag: Task tag of the command + * @lun: LUN of the command + */ +struct ufshcd_lrb { + struct utp_transfer_req_desc *utr_descriptor_ptr; + struct utp_upiu_cmd *ucd_cmd_ptr; + struct utp_upiu_rsp *ucd_rsp_ptr; + struct ufshcd_sg_entry *ucd_prdt_ptr; + + struct scsi_cmnd *cmd; + u8 *sense_buffer; + unsigned int sense_bufflen; + int scsi_status; + + int command_type; + int task_tag; + unsigned int lun; +}; + +/** + * ufshcd_get_ufs_version - Get the UFS version supported by the HBA + * @hba - Pointer to adapter instance + * + * Returns UFSHCI version supported by the controller + */ +static inline u32 ufshcd_get_ufs_version(struct ufs_hba *hba) +{ + return readl(hba->mmio_base + REG_UFS_VERSION); +} + +/** + * ufshcd_is_device_present - Check if any device connected to + * the host controller + * @reg_hcs - host controller status register value + * + * Returns 0 if device present, non-zero if no device detected + */ +static inline int ufshcd_is_device_present(u32 reg_hcs) +{ + return (DEVICE_PRESENT & reg_hcs) ? 0 : -1; +} + +/** + * ufshcd_get_tr_ocs - Get the UTRD Overall Command Status + * @lrb: pointer to local command reference block + * + * This function is used to get the OCS field from UTRD + * Returns the OCS field in the UTRD + */ +static inline int ufshcd_get_tr_ocs(struct ufshcd_lrb *lrbp) +{ + return lrbp->utr_descriptor_ptr->header.dword_2 & MASK_OCS; +} + +/** + * ufshcd_get_tmr_ocs - Get the UTMRD Overall Command Status + * @task_req_descp: pointer to utp_task_req_desc structure + * + * This function is used to get the OCS field from UTMRD + * Returns the OCS field in the UTMRD + */ +static inline int +ufshcd_get_tmr_ocs(struct utp_task_req_desc *task_req_descp) +{ + return task_req_descp->header.dword_2 & MASK_OCS; +} + +/** + * ufshcd_get_tm_free_slot - get a free slot for task management request + * @hba: per adapter instance + * + * Returns maximum number of task management request slots in case of + * task management queue full or returns the free slot number + */ +static inline int ufshcd_get_tm_free_slot(struct ufs_hba *hba) +{ + return find_first_zero_bit(&hba->outstanding_tasks, hba->nutmrs); +} + +/** + * ufshcd_utrl_clear - Clear a bit in UTRLCLR register + * @hba: per adapter instance + * @pos: position of the bit to be cleared + */ +static inline void ufshcd_utrl_clear(struct ufs_hba *hba, u32 pos) +{ + writel(~(1 << pos), + (hba->mmio_base + REG_UTP_TRANSFER_REQ_LIST_CLEAR)); +} + +/** + * ufshcd_get_lists_status - Check UCRDY, UTRLRDY and UTMRLRDY + * @reg: Register value of host controller status + * + * Returns integer, 0 on Success and positive value if failed + */ +static inline int ufshcd_get_lists_status(u32 reg) +{ + /* + * The mask 0xFF is for the following HCS register bits + * Bit Description + * 0 Device Present + * 1 UTRLRDY + * 2 UTMRLRDY + * 3 UCRDY + * 4 HEI + * 5 DEI + * 6-7 reserved + */ + return (((reg) & (0xFF)) >> 1) ^ (0x07); +} + +/** + * ufshcd_get_uic_cmd_result - Get the UIC command result + * @hba: Pointer to adapter instance + * + * This function gets the result of UIC command completion + * Returns 0 on success, non zero value on error + */ +static inline int ufshcd_get_uic_cmd_result(struct ufs_hba *hba) +{ + return readl(hba->mmio_base + REG_UIC_COMMAND_ARG_2) & + MASK_UIC_COMMAND_RESULT; +} + +/** + * ufshcd_free_hba_memory - Free allocated memory for LRB, request + * and task lists + * @hba: Pointer to adapter instance + */ +static inline void ufshcd_free_hba_memory(struct ufs_hba *hba) +{ + size_t utmrdl_size, utrdl_size, ucdl_size; + + kfree(hba->lrb); + + if (hba->utmrdl_base_addr) { + utmrdl_size = sizeof(struct utp_task_req_desc) * hba->nutmrs; + dma_free_coherent(&hba->pdev->dev, utmrdl_size, + hba->utmrdl_base_addr, hba->utmrdl_dma_addr); + } + + if (hba->utrdl_base_addr) { + utrdl_size = + (sizeof(struct utp_transfer_req_desc) * hba->nutrs); + dma_free_coherent(&hba->pdev->dev, utrdl_size, + hba->utrdl_base_addr, hba->utrdl_dma_addr); + } + + if (hba->ucdl_base_addr) { + ucdl_size = + (sizeof(struct utp_transfer_cmd_desc) * hba->nutrs); + dma_free_coherent(&hba->pdev->dev, ucdl_size, + hba->ucdl_base_addr, hba->ucdl_dma_addr); + } +} + +/** + * ufshcd_is_valid_req_rsp - checks if controller TR response is valid + * @ucd_rsp_ptr: pointer to response UPIU + * + * This function checks the response UPIU for valid transaction type in + * response field + * Returns 0 on success, non-zero on failure + */ +static inline int +ufshcd_is_valid_req_rsp(struct utp_upiu_rsp *ucd_rsp_ptr) +{ + return ((be32_to_cpu(ucd_rsp_ptr->header.dword_0) >> 24) == + UPIU_TRANSACTION_RESPONSE) ? 0 : DID_ERROR << 16; +} + +/** + * ufshcd_get_rsp_upiu_result - Get the result from response UPIU + * @ucd_rsp_ptr: pointer to response UPIU + * + * This function gets the response status and scsi_status from response UPIU + * Returns the response result code. + */ +static inline int +ufshcd_get_rsp_upiu_result(struct utp_upiu_rsp *ucd_rsp_ptr) +{ + return be32_to_cpu(ucd_rsp_ptr->header.dword_1) & MASK_RSP_UPIU_RESULT; +} + +/** + * ufshcd_config_int_aggr - Configure interrupt aggregation values. + * Currently there is no use case where we want to configure + * interrupt aggregation dynamically. So to configure interrupt + * aggregation, #define INT_AGGR_COUNTER_THRESHOLD_VALUE and + * INT_AGGR_TIMEOUT_VALUE are used. + * @hba: per adapter instance + * @option: Interrupt aggregation option + */ +static inline void +ufshcd_config_int_aggr(struct ufs_hba *hba, int option) +{ + switch (option) { + case INT_AGGR_RESET: + writel((INT_AGGR_ENABLE | + INT_AGGR_COUNTER_AND_TIMER_RESET), + (hba->mmio_base + + REG_UTP_TRANSFER_REQ_INT_AGG_CONTROL)); + break; + case INT_AGGR_CONFIG: + writel((INT_AGGR_ENABLE | + INT_AGGR_PARAM_WRITE | + INT_AGGR_COUNTER_THRESHOLD_VALUE | + INT_AGGR_TIMEOUT_VALUE), + (hba->mmio_base + + REG_UTP_TRANSFER_REQ_INT_AGG_CONTROL)); + break; + } +} + +/** + * ufshcd_enable_run_stop_reg - Enable run-stop registers, + * When run-stop registers are set to 1, it indicates the + * host controller that it can process the requests + * @hba: per adapter instance + */ +static void ufshcd_enable_run_stop_reg(struct ufs_hba *hba) +{ + writel(UTP_TASK_REQ_LIST_RUN_STOP_BIT, + (hba->mmio_base + + REG_UTP_TASK_REQ_LIST_RUN_STOP)); + writel(UTP_TRANSFER_REQ_LIST_RUN_STOP_BIT, + (hba->mmio_base + + REG_UTP_TRANSFER_REQ_LIST_RUN_STOP)); +} + +/** + * ufshcd_hba_stop - Send controller to reset state + * @hba: per adapter instance + */ +static inline void ufshcd_hba_stop(struct ufs_hba *hba) +{ + writel(CONTROLLER_DISABLE, (hba->mmio_base + REG_CONTROLLER_ENABLE)); +} + +/** + * ufshcd_hba_start - Start controller initialization sequence + * @hba: per adapter instance + */ +static inline void ufshcd_hba_start(struct ufs_hba *hba) +{ + writel(CONTROLLER_ENABLE , (hba->mmio_base + REG_CONTROLLER_ENABLE)); +} + +/** + * ufshcd_is_hba_active - Get controller state + * @hba: per adapter instance + * + * Returns zero if controller is active, 1 otherwise + */ +static inline int ufshcd_is_hba_active(struct ufs_hba *hba) +{ + return (readl(hba->mmio_base + REG_CONTROLLER_ENABLE) & 0x1) ? 0 : 1; +} + +/** + * ufshcd_send_command - Send SCSI or device management commands + * @hba: per adapter instance + * @task_tag: Task tag of the command + */ +static inline +void ufshcd_send_command(struct ufs_hba *hba, unsigned int task_tag) +{ + __set_bit(task_tag, &hba->outstanding_reqs); + writel((1 << task_tag), + (hba->mmio_base + REG_UTP_TRANSFER_REQ_DOOR_BELL)); +} + +/** + * ufshcd_copy_sense_data - Copy sense data in case of check condition + * @lrb - pointer to local reference block + */ +static inline void ufshcd_copy_sense_data(struct ufshcd_lrb *lrbp) +{ + int len; + if (lrbp->sense_buffer) { + len = be16_to_cpu(lrbp->ucd_rsp_ptr->sense_data_len); + memcpy(lrbp->sense_buffer, + lrbp->ucd_rsp_ptr->sense_data, + min_t(int, len, SCSI_SENSE_BUFFERSIZE)); + } +} + +/** + * ufshcd_hba_capabilities - Read controller capabilities + * @hba: per adapter instance + */ +static inline void ufshcd_hba_capabilities(struct ufs_hba *hba) +{ + hba->capabilities = + readl(hba->mmio_base + REG_CONTROLLER_CAPABILITIES); + + /* nutrs and nutmrs are 0 based values */ + hba->nutrs = (hba->capabilities & MASK_TRANSFER_REQUESTS_SLOTS) + 1; + hba->nutmrs = + ((hba->capabilities & MASK_TASK_MANAGEMENT_REQUEST_SLOTS) >> 16) + 1; +} + +/** + * ufshcd_send_uic_command - Send UIC commands to unipro layers + * @hba: per adapter instance + * @uic_command: UIC command + */ +static inline void +ufshcd_send_uic_command(struct ufs_hba *hba, struct uic_command *uic_cmnd) +{ + /* Write Args */ + writel(uic_cmnd->argument1, + (hba->mmio_base + REG_UIC_COMMAND_ARG_1)); + writel(uic_cmnd->argument2, + (hba->mmio_base + REG_UIC_COMMAND_ARG_2)); + writel(uic_cmnd->argument3, + (hba->mmio_base + REG_UIC_COMMAND_ARG_3)); + + /* Write UIC Cmd */ + writel((uic_cmnd->command & COMMAND_OPCODE_MASK), + (hba->mmio_base + REG_UIC_COMMAND)); +} + +/** + * ufshcd_map_sg - Map scatter-gather list to prdt + * @lrbp - pointer to local reference block + * + * Returns 0 in case of success, non-zero value in case of failure + */ +static int ufshcd_map_sg(struct ufshcd_lrb *lrbp) +{ + struct ufshcd_sg_entry *prd_table; + struct scatterlist *sg; + struct scsi_cmnd *cmd; + int sg_segments; + int i; + + cmd = lrbp->cmd; + sg_segments = scsi_dma_map(cmd); + if (sg_segments < 0) + return sg_segments; + + if (sg_segments) { + lrbp->utr_descriptor_ptr->prd_table_length = + cpu_to_le16((u16) (sg_segments)); + + prd_table = (struct ufshcd_sg_entry *)lrbp->ucd_prdt_ptr; + + scsi_for_each_sg(cmd, sg, sg_segments, i) { + prd_table[i].size = + cpu_to_le32(((u32) sg_dma_len(sg))-1); + prd_table[i].base_addr = + cpu_to_le32(lower_32_bits(sg->dma_address)); + prd_table[i].upper_addr = + cpu_to_le32(upper_32_bits(sg->dma_address)); + } + } else { + lrbp->utr_descriptor_ptr->prd_table_length = 0; + } + + return 0; +} + +/** + * ufshcd_int_config - enable/disable interrupts + * @hba: per adapter instance + * @option: interrupt option + */ +static void ufshcd_int_config(struct ufs_hba *hba, u32 option) +{ + switch (option) { + case UFSHCD_INT_ENABLE: + writel(hba->int_enable_mask, + (hba->mmio_base + REG_INTERRUPT_ENABLE)); + break; + case UFSHCD_INT_DISABLE: + if (hba->ufs_version == UFSHCI_VERSION_10) + writel(INTERRUPT_DISABLE_MASK_10, + (hba->mmio_base + REG_INTERRUPT_ENABLE)); + else + writel(INTERRUPT_DISABLE_MASK_11, + (hba->mmio_base + REG_INTERRUPT_ENABLE)); + break; + } +} + +/** + * ufshcd_compose_upiu - form UFS Protocol Information Unit(UPIU) + * @lrb - pointer to local reference block + */ +static void ufshcd_compose_upiu(struct ufshcd_lrb *lrbp) +{ + struct utp_transfer_req_desc *req_desc; + struct utp_upiu_cmd *ucd_cmd_ptr; + u32 data_direction; + u32 upiu_flags; + + ucd_cmd_ptr = lrbp->ucd_cmd_ptr; + req_desc = lrbp->utr_descriptor_ptr; + + switch (lrbp->command_type) { + case UTP_CMD_TYPE_SCSI: + if (lrbp->cmd->sc_data_direction == DMA_FROM_DEVICE) { + data_direction = UTP_DEVICE_TO_HOST; + upiu_flags = UPIU_CMD_FLAGS_READ; + } else if (lrbp->cmd->sc_data_direction == DMA_TO_DEVICE) { + data_direction = UTP_HOST_TO_DEVICE; + upiu_flags = UPIU_CMD_FLAGS_WRITE; + } else { + data_direction = UTP_NO_DATA_TRANSFER; + upiu_flags = UPIU_CMD_FLAGS_NONE; + } + + /* Transfer request descriptor header fields */ + req_desc->header.dword_0 = + cpu_to_le32(data_direction | UTP_SCSI_COMMAND); + + /* + * assigning invalid value for command status. Controller + * updates OCS on command completion, with the command + * status + */ + req_desc->header.dword_2 = + cpu_to_le32(OCS_INVALID_COMMAND_STATUS); + + /* command descriptor fields */ + ucd_cmd_ptr->header.dword_0 = + cpu_to_be32(UPIU_HEADER_DWORD(UPIU_TRANSACTION_COMMAND, + upiu_flags, + lrbp->lun, + lrbp->task_tag)); + ucd_cmd_ptr->header.dword_1 = + cpu_to_be32( + UPIU_HEADER_DWORD(UPIU_COMMAND_SET_TYPE_SCSI, + 0, + 0, + 0)); + + /* Total EHS length and Data segment length will be zero */ + ucd_cmd_ptr->header.dword_2 = 0; + + ucd_cmd_ptr->exp_data_transfer_len = + cpu_to_be32(lrbp->cmd->transfersize); + + memcpy(ucd_cmd_ptr->cdb, + lrbp->cmd->cmnd, + (min_t(unsigned short, + lrbp->cmd->cmd_len, + MAX_CDB_SIZE))); + break; + case UTP_CMD_TYPE_DEV_MANAGE: + /* For query function implementation */ + break; + case UTP_CMD_TYPE_UFS: + /* For UFS native command implementation */ + break; + } /* end of switch */ +} + +/** + * ufshcd_queuecommand - main entry point for SCSI requests + * @cmd: command from SCSI Midlayer + * @done: call back function + * + * Returns 0 for success, non-zero in case of failure + */ +static int ufshcd_queuecommand(struct Scsi_Host *host, struct scsi_cmnd *cmd) +{ + struct ufshcd_lrb *lrbp; + struct ufs_hba *hba; + unsigned long flags; + int tag; + int err = 0; + + hba = shost_priv(host); + + tag = cmd->request->tag; + + if (hba->ufshcd_state != UFSHCD_STATE_OPERATIONAL) { + err = SCSI_MLQUEUE_HOST_BUSY; + goto out; + } + + lrbp = &hba->lrb[tag]; + + lrbp->cmd = cmd; + lrbp->sense_bufflen = SCSI_SENSE_BUFFERSIZE; + lrbp->sense_buffer = cmd->sense_buffer; + lrbp->task_tag = tag; + lrbp->lun = cmd->device->lun; + + lrbp->command_type = UTP_CMD_TYPE_SCSI; + + /* form UPIU before issuing the command */ + ufshcd_compose_upiu(lrbp); + err = ufshcd_map_sg(lrbp); + if (err) + goto out; + + /* issue command to the controller */ + spin_lock_irqsave(hba->host->host_lock, flags); + ufshcd_send_command(hba, tag); + spin_unlock_irqrestore(hba->host->host_lock, flags); +out: + return err; +} + +/** + * ufshcd_memory_alloc - allocate memory for host memory space data structures + * @hba: per adapter instance + * + * 1. Allocate DMA memory for Command Descriptor array + * Each command descriptor consist of Command UPIU, Response UPIU and PRDT + * 2. Allocate DMA memory for UTP Transfer Request Descriptor List (UTRDL). + * 3. Allocate DMA memory for UTP Task Management Request Descriptor List + * (UTMRDL) + * 4. Allocate memory for local reference block(lrb). + * + * Returns 0 for success, non-zero in case of failure + */ +static int ufshcd_memory_alloc(struct ufs_hba *hba) +{ + size_t utmrdl_size, utrdl_size, ucdl_size; + + /* Allocate memory for UTP command descriptors */ + ucdl_size = (sizeof(struct utp_transfer_cmd_desc) * hba->nutrs); + hba->ucdl_base_addr = dma_alloc_coherent(&hba->pdev->dev, + ucdl_size, + &hba->ucdl_dma_addr, + GFP_KERNEL); + + /* + * UFSHCI requires UTP command descriptor to be 128 byte aligned. + * make sure hba->ucdl_dma_addr is aligned to PAGE_SIZE + * if hba->ucdl_dma_addr is aligned to PAGE_SIZE, then it will + * be aligned to 128 bytes as well + */ + if (!hba->ucdl_base_addr || + WARN_ON(hba->ucdl_dma_addr & (PAGE_SIZE - 1))) { + dev_err(&hba->pdev->dev, + "Command Descriptor Memory allocation failed\n"); + goto out; + } + + /* + * Allocate memory for UTP Transfer descriptors + * UFSHCI requires 1024 byte alignment of UTRD + */ + utrdl_size = (sizeof(struct utp_transfer_req_desc) * hba->nutrs); + hba->utrdl_base_addr = dma_alloc_coherent(&hba->pdev->dev, + utrdl_size, + &hba->utrdl_dma_addr, + GFP_KERNEL); + if (!hba->utrdl_base_addr || + WARN_ON(hba->utrdl_dma_addr & (PAGE_SIZE - 1))) { + dev_err(&hba->pdev->dev, + "Transfer Descriptor Memory allocation failed\n"); + goto out; + } + + /* + * Allocate memory for UTP Task Management descriptors + * UFSHCI requires 1024 byte alignment of UTMRD + */ + utmrdl_size = sizeof(struct utp_task_req_desc) * hba->nutmrs; + hba->utmrdl_base_addr = dma_alloc_coherent(&hba->pdev->dev, + utmrdl_size, + &hba->utmrdl_dma_addr, + GFP_KERNEL); + if (!hba->utmrdl_base_addr || + WARN_ON(hba->utmrdl_dma_addr & (PAGE_SIZE - 1))) { + dev_err(&hba->pdev->dev, + "Task Management Descriptor Memory allocation failed\n"); + goto out; + } + + /* Allocate memory for local reference block */ + hba->lrb = kcalloc(hba->nutrs, sizeof(struct ufshcd_lrb), GFP_KERNEL); + if (!hba->lrb) { + dev_err(&hba->pdev->dev, "LRB Memory allocation failed\n"); + goto out; + } + return 0; +out: + ufshcd_free_hba_memory(hba); + return -ENOMEM; +} + +/** + * ufshcd_host_memory_configure - configure local reference block with + * memory offsets + * @hba: per adapter instance + * + * Configure Host memory space + * 1. Update Corresponding UTRD.UCDBA and UTRD.UCDBAU with UCD DMA + * address. + * 2. Update each UTRD with Response UPIU offset, Response UPIU length + * and PRDT offset. + * 3. Save the corresponding addresses of UTRD, UCD.CMD, UCD.RSP and UCD.PRDT + * into local reference block. + */ +static void ufshcd_host_memory_configure(struct ufs_hba *hba) +{ + struct utp_transfer_cmd_desc *cmd_descp; + struct utp_transfer_req_desc *utrdlp; + dma_addr_t cmd_desc_dma_addr; + dma_addr_t cmd_desc_element_addr; + u16 response_offset; + u16 prdt_offset; + int cmd_desc_size; + int i; + + utrdlp = hba->utrdl_base_addr; + cmd_descp = hba->ucdl_base_addr; + + response_offset = + offsetof(struct utp_transfer_cmd_desc, response_upiu); + prdt_offset = + offsetof(struct utp_transfer_cmd_desc, prd_table); + + cmd_desc_size = sizeof(struct utp_transfer_cmd_desc); + cmd_desc_dma_addr = hba->ucdl_dma_addr; + + for (i = 0; i < hba->nutrs; i++) { + /* Configure UTRD with command descriptor base address */ + cmd_desc_element_addr = + (cmd_desc_dma_addr + (cmd_desc_size * i)); + utrdlp[i].command_desc_base_addr_lo = + cpu_to_le32(lower_32_bits(cmd_desc_element_addr)); + utrdlp[i].command_desc_base_addr_hi = + cpu_to_le32(upper_32_bits(cmd_desc_element_addr)); + + /* Response upiu and prdt offset should be in double words */ + utrdlp[i].response_upiu_offset = + cpu_to_le16((response_offset >> 2)); + utrdlp[i].prd_table_offset = + cpu_to_le16((prdt_offset >> 2)); + utrdlp[i].response_upiu_length = + cpu_to_le16(ALIGNED_UPIU_SIZE); + + hba->lrb[i].utr_descriptor_ptr = (utrdlp + i); + hba->lrb[i].ucd_cmd_ptr = + (struct utp_upiu_cmd *)(cmd_descp + i); + hba->lrb[i].ucd_rsp_ptr = + (struct utp_upiu_rsp *)cmd_descp[i].response_upiu; + hba->lrb[i].ucd_prdt_ptr = + (struct ufshcd_sg_entry *)cmd_descp[i].prd_table; + } +} + +/** + * ufshcd_dme_link_startup - Notify Unipro to perform link startup + * @hba: per adapter instance + * + * UIC_CMD_DME_LINK_STARTUP command must be issued to Unipro layer, + * in order to initialize the Unipro link startup procedure. + * Once the Unipro links are up, the device connected to the controller + * is detected. + * + * Returns 0 on success, non-zero value on failure + */ +static int ufshcd_dme_link_startup(struct ufs_hba *hba) +{ + struct uic_command *uic_cmd; + unsigned long flags; + + /* check if controller is ready to accept UIC commands */ + if (((readl(hba->mmio_base + REG_CONTROLLER_STATUS)) & + UIC_COMMAND_READY) == 0x0) { + dev_err(&hba->pdev->dev, + "Controller not ready" + " to accept UIC commands\n"); + return -EIO; + } + + spin_lock_irqsave(hba->host->host_lock, flags); + + /* form UIC command */ + uic_cmd = &hba->active_uic_cmd; + uic_cmd->command = UIC_CMD_DME_LINK_STARTUP; + uic_cmd->argument1 = 0; + uic_cmd->argument2 = 0; + uic_cmd->argument3 = 0; + + /* enable UIC related interrupts */ + hba->int_enable_mask |= UIC_COMMAND_COMPL; + ufshcd_int_config(hba, UFSHCD_INT_ENABLE); + + /* sending UIC commands to controller */ + ufshcd_send_uic_command(hba, uic_cmd); + spin_unlock_irqrestore(hba->host->host_lock, flags); + return 0; +} + +/** + * ufshcd_make_hba_operational - Make UFS controller operational + * @hba: per adapter instance + * + * To bring UFS host controller to operational state, + * 1. Check if device is present + * 2. Configure run-stop-registers + * 3. Enable required interrupts + * 4. Configure interrupt aggregation + * + * Returns 0 on success, non-zero value on failure + */ +static int ufshcd_make_hba_operational(struct ufs_hba *hba) +{ + int err = 0; + u32 reg; + + /* check if device present */ + reg = readl((hba->mmio_base + REG_CONTROLLER_STATUS)); + if (ufshcd_is_device_present(reg)) { + dev_err(&hba->pdev->dev, "cc: Device not present\n"); + err = -ENXIO; + goto out; + } + + /* + * UCRDY, UTMRLDY and UTRLRDY bits must be 1 + * DEI, HEI bits must be 0 + */ + if (!(ufshcd_get_lists_status(reg))) { + ufshcd_enable_run_stop_reg(hba); + } else { + dev_err(&hba->pdev->dev, + "Host controller not ready to process requests"); + err = -EIO; + goto out; + } + + /* Enable required interrupts */ + hba->int_enable_mask |= (UTP_TRANSFER_REQ_COMPL | + UIC_ERROR | + UTP_TASK_REQ_COMPL | + DEVICE_FATAL_ERROR | + CONTROLLER_FATAL_ERROR | + SYSTEM_BUS_FATAL_ERROR); + ufshcd_int_config(hba, UFSHCD_INT_ENABLE); + + /* Configure interrupt aggregation */ + ufshcd_config_int_aggr(hba, INT_AGGR_CONFIG); + + if (hba->ufshcd_state == UFSHCD_STATE_RESET) + scsi_unblock_requests(hba->host); + + hba->ufshcd_state = UFSHCD_STATE_OPERATIONAL; + scsi_scan_host(hba->host); +out: + return err; +} + +/** + * ufshcd_hba_enable - initialize the controller + * @hba: per adapter instance + * + * The controller resets itself and controller firmware initialization + * sequence kicks off. When controller is ready it will set + * the Host Controller Enable bit to 1. + * + * Returns 0 on success, non-zero value on failure + */ +static int ufshcd_hba_enable(struct ufs_hba *hba) +{ + int retry; + + /* + * msleep of 1 and 5 used in this function might result in msleep(20), + * but it was necessary to send the UFS FPGA to reset mode during + * development and testing of this driver. msleep can be changed to + * mdelay and retry count can be reduced based on the controller. + */ + if (!ufshcd_is_hba_active(hba)) { + + /* change controller state to "reset state" */ + ufshcd_hba_stop(hba); + + /* + * This delay is based on the testing done with UFS host + * controller FPGA. The delay can be changed based on the + * host controller used. + */ + msleep(5); + } + + /* start controller initialization sequence */ + ufshcd_hba_start(hba); + + /* + * To initialize a UFS host controller HCE bit must be set to 1. + * During initialization the HCE bit value changes from 1->0->1. + * When the host controller completes initialization sequence + * it sets the value of HCE bit to 1. The same HCE bit is read back + * to check if the controller has completed initialization sequence. + * So without this delay the value HCE = 1, set in the previous + * instruction might be read back. + * This delay can be changed based on the controller. + */ + msleep(1); + + /* wait for the host controller to complete initialization */ + retry = 10; + while (ufshcd_is_hba_active(hba)) { + if (retry) { + retry--; + } else { + dev_err(&hba->pdev->dev, + "Controller enable failed\n"); + return -EIO; + } + msleep(5); + } + return 0; +} + +/** + * ufshcd_initialize_hba - start the initialization process + * @hba: per adapter instance + * + * 1. Enable the controller via ufshcd_hba_enable. + * 2. Program the Transfer Request List Address with the starting address of + * UTRDL. + * 3. Program the Task Management Request List Address with starting address + * of UTMRDL. + * + * Returns 0 on success, non-zero value on failure. + */ +static int ufshcd_initialize_hba(struct ufs_hba *hba) +{ + if (ufshcd_hba_enable(hba)) + return -EIO; + + /* Configure UTRL and UTMRL base address registers */ + writel(hba->utrdl_dma_addr, + (hba->mmio_base + REG_UTP_TRANSFER_REQ_LIST_BASE_L)); + writel(lower_32_bits(hba->utrdl_dma_addr), + (hba->mmio_base + REG_UTP_TRANSFER_REQ_LIST_BASE_H)); + writel(hba->utmrdl_dma_addr, + (hba->mmio_base + REG_UTP_TASK_REQ_LIST_BASE_L)); + writel(upper_32_bits(hba->utmrdl_dma_addr), + (hba->mmio_base + REG_UTP_TASK_REQ_LIST_BASE_H)); + + /* Initialize unipro link startup procedure */ + return ufshcd_dme_link_startup(hba); +} + +/** + * ufshcd_do_reset - reset the host controller + * @hba: per adapter instance + * + * Returns SUCCESS/FAILED + */ +static int ufshcd_do_reset(struct ufs_hba *hba) +{ + struct ufshcd_lrb *lrbp; + unsigned long flags; + int tag; + + /* block commands from midlayer */ + scsi_block_requests(hba->host); + + spin_lock_irqsave(hba->host->host_lock, flags); + hba->ufshcd_state = UFSHCD_STATE_RESET; + + /* send controller to reset state */ + ufshcd_hba_stop(hba); + spin_unlock_irqrestore(hba->host->host_lock, flags); + + /* abort outstanding commands */ + for (tag = 0; tag < hba->nutrs; tag++) { + if (test_bit(tag, &hba->outstanding_reqs)) { + lrbp = &hba->lrb[tag]; + scsi_dma_unmap(lrbp->cmd); + lrbp->cmd->result = DID_RESET << 16; + lrbp->cmd->scsi_done(lrbp->cmd); + lrbp->cmd = NULL; + } + } + + /* clear outstanding request/task bit maps */ + hba->outstanding_reqs = 0; + hba->outstanding_tasks = 0; + + /* start the initialization process */ + if (ufshcd_initialize_hba(hba)) { + dev_err(&hba->pdev->dev, + "Reset: Controller initialization failed\n"); + return FAILED; + } + return SUCCESS; +} + +/** + * ufshcd_slave_alloc - handle initial SCSI device configurations + * @sdev: pointer to SCSI device + * + * Returns success + */ +static int ufshcd_slave_alloc(struct scsi_device *sdev) +{ + struct ufs_hba *hba; + + hba = shost_priv(sdev->host); + sdev->tagged_supported = 1; + + /* Mode sense(6) is not supported by UFS, so use Mode sense(10) */ + sdev->use_10_for_ms = 1; + scsi_set_tag_type(sdev, MSG_SIMPLE_TAG); + + /* + * Inform SCSI Midlayer that the LUN queue depth is same as the + * controller queue depth. If a LUN queue depth is less than the + * controller queue depth and if the LUN reports + * SAM_STAT_TASK_SET_FULL, the LUN queue depth will be adjusted + * with scsi_adjust_queue_depth. + */ + scsi_activate_tcq(sdev, hba->nutrs); + return 0; +} + +/** + * ufshcd_slave_destroy - remove SCSI device configurations + * @sdev: pointer to SCSI device + */ +static void ufshcd_slave_destroy(struct scsi_device *sdev) +{ + struct ufs_hba *hba; + + hba = shost_priv(sdev->host); + scsi_deactivate_tcq(sdev, hba->nutrs); +} + +/** + * ufshcd_task_req_compl - handle task management request completion + * @hba: per adapter instance + * @index: index of the completed request + * + * Returns SUCCESS/FAILED + */ +static int ufshcd_task_req_compl(struct ufs_hba *hba, u32 index) +{ + struct utp_task_req_desc *task_req_descp; + struct utp_upiu_task_rsp *task_rsp_upiup; + unsigned long flags; + int ocs_value; + int task_result; + + spin_lock_irqsave(hba->host->host_lock, flags); + + /* Clear completed tasks from outstanding_tasks */ + __clear_bit(index, &hba->outstanding_tasks); + + task_req_descp = hba->utmrdl_base_addr; + ocs_value = ufshcd_get_tmr_ocs(&task_req_descp[index]); + + if (ocs_value == OCS_SUCCESS) { + task_rsp_upiup = (struct utp_upiu_task_rsp *) + task_req_descp[index].task_rsp_upiu; + task_result = be32_to_cpu(task_rsp_upiup->header.dword_1); + task_result = ((task_result & MASK_TASK_RESPONSE) >> 8); + + if (task_result != UPIU_TASK_MANAGEMENT_FUNC_COMPL || + task_result != UPIU_TASK_MANAGEMENT_FUNC_SUCCEEDED) + task_result = FAILED; + } else { + task_result = FAILED; + dev_err(&hba->pdev->dev, + "trc: Invalid ocs = %x\n", ocs_value); + } + spin_unlock_irqrestore(hba->host->host_lock, flags); + return task_result; +} + +/** + * ufshcd_adjust_lun_qdepth - Update LUN queue depth if device responds with + * SAM_STAT_TASK_SET_FULL SCSI command status. + * @cmd: pointer to SCSI command + */ +static void ufshcd_adjust_lun_qdepth(struct scsi_cmnd *cmd) +{ + struct ufs_hba *hba; + int i; + int lun_qdepth = 0; + + hba = shost_priv(cmd->device->host); + + /* + * LUN queue depth can be obtained by counting outstanding commands + * on the LUN. + */ + for (i = 0; i < hba->nutrs; i++) { + if (test_bit(i, &hba->outstanding_reqs)) { + + /* + * Check if the outstanding command belongs + * to the LUN which reported SAM_STAT_TASK_SET_FULL. + */ + if (cmd->device->lun == hba->lrb[i].lun) + lun_qdepth++; + } + } + + /* + * LUN queue depth will be total outstanding commands, except the + * command for which the LUN reported SAM_STAT_TASK_SET_FULL. + */ + scsi_adjust_queue_depth(cmd->device, MSG_SIMPLE_TAG, lun_qdepth - 1); +} + +/** + * ufshcd_scsi_cmd_status - Update SCSI command result based on SCSI status + * @lrb: pointer to local reference block of completed command + * @scsi_status: SCSI command status + * + * Returns value base on SCSI command status + */ +static inline int +ufshcd_scsi_cmd_status(struct ufshcd_lrb *lrbp, int scsi_status) +{ + int result = 0; + + switch (scsi_status) { + case SAM_STAT_GOOD: + result |= DID_OK << 16 | + COMMAND_COMPLETE << 8 | + SAM_STAT_GOOD; + break; + case SAM_STAT_CHECK_CONDITION: + result |= DID_OK << 16 | + COMMAND_COMPLETE << 8 | + SAM_STAT_CHECK_CONDITION; + ufshcd_copy_sense_data(lrbp); + break; + case SAM_STAT_BUSY: + result |= SAM_STAT_BUSY; + break; + case SAM_STAT_TASK_SET_FULL: + + /* + * If a LUN reports SAM_STAT_TASK_SET_FULL, then the LUN queue + * depth needs to be adjusted to the exact number of + * outstanding commands the LUN can handle at any given time. + */ + ufshcd_adjust_lun_qdepth(lrbp->cmd); + result |= SAM_STAT_TASK_SET_FULL; + break; + case SAM_STAT_TASK_ABORTED: + result |= SAM_STAT_TASK_ABORTED; + break; + default: + result |= DID_ERROR << 16; + break; + } /* end of switch */ + + return result; +} + +/** + * ufshcd_transfer_rsp_status - Get overall status of the response + * @hba: per adapter instance + * @lrb: pointer to local reference block of completed command + * + * Returns result of the command to notify SCSI midlayer + */ +static inline int +ufshcd_transfer_rsp_status(struct ufs_hba *hba, struct ufshcd_lrb *lrbp) +{ + int result = 0; + int scsi_status; + int ocs; + + /* overall command status of utrd */ + ocs = ufshcd_get_tr_ocs(lrbp); + + switch (ocs) { + case OCS_SUCCESS: + + /* check if the returned transfer response is valid */ + result = ufshcd_is_valid_req_rsp(lrbp->ucd_rsp_ptr); + if (result) { + dev_err(&hba->pdev->dev, + "Invalid response = %x\n", result); + break; + } + + /* + * get the response UPIU result to extract + * the SCSI command status + */ + result = ufshcd_get_rsp_upiu_result(lrbp->ucd_rsp_ptr); + + /* + * get the result based on SCSI status response + * to notify the SCSI midlayer of the command status + */ + scsi_status = result & MASK_SCSI_STATUS; + result = ufshcd_scsi_cmd_status(lrbp, scsi_status); + break; + case OCS_ABORTED: + result |= DID_ABORT << 16; + break; + case OCS_INVALID_CMD_TABLE_ATTR: + case OCS_INVALID_PRDT_ATTR: + case OCS_MISMATCH_DATA_BUF_SIZE: + case OCS_MISMATCH_RESP_UPIU_SIZE: + case OCS_PEER_COMM_FAILURE: + case OCS_FATAL_ERROR: + default: + result |= DID_ERROR << 16; + dev_err(&hba->pdev->dev, + "OCS error from controller = %x\n", ocs); + break; + } /* end of switch */ + + return result; +} + +/** + * ufshcd_transfer_req_compl - handle SCSI and query command completion + * @hba: per adapter instance + */ +static void ufshcd_transfer_req_compl(struct ufs_hba *hba) +{ + struct ufshcd_lrb *lrb; + unsigned long completed_reqs; + u32 tr_doorbell; + int result; + int index; + + lrb = hba->lrb; + tr_doorbell = + readl(hba->mmio_base + REG_UTP_TRANSFER_REQ_DOOR_BELL); + completed_reqs = tr_doorbell ^ hba->outstanding_reqs; + + for (index = 0; index < hba->nutrs; index++) { + if (test_bit(index, &completed_reqs)) { + + result = ufshcd_transfer_rsp_status(hba, &lrb[index]); + + if (lrb[index].cmd) { + scsi_dma_unmap(lrb[index].cmd); + lrb[index].cmd->result = result; + lrb[index].cmd->scsi_done(lrb[index].cmd); + + /* Mark completed command as NULL in LRB */ + lrb[index].cmd = NULL; + } + } /* end of if */ + } /* end of for */ + + /* clear corresponding bits of completed commands */ + hba->outstanding_reqs ^= completed_reqs; + + /* Reset interrupt aggregation counters */ + ufshcd_config_int_aggr(hba, INT_AGGR_RESET); +} + +/** + * ufshcd_uic_cc_handler - handle UIC command completion + * @work: pointer to a work queue structure + * + * Returns 0 on success, non-zero value on failure + */ +static void ufshcd_uic_cc_handler (struct work_struct *work) +{ + struct ufs_hba *hba; + + hba = container_of(work, struct ufs_hba, uic_workq); + + if ((hba->active_uic_cmd.command == UIC_CMD_DME_LINK_STARTUP) && + !(ufshcd_get_uic_cmd_result(hba))) { + + if (ufshcd_make_hba_operational(hba)) + dev_err(&hba->pdev->dev, + "cc: hba not operational state\n"); + return; + } +} + +/** + * ufshcd_fatal_err_handler - handle fatal errors + * @hba: per adapter instance + */ +static void ufshcd_fatal_err_handler(struct work_struct *work) +{ + struct ufs_hba *hba; + hba = container_of(work, struct ufs_hba, feh_workq); + + /* check if reset is already in progress */ + if (hba->ufshcd_state != UFSHCD_STATE_RESET) + ufshcd_do_reset(hba); +} + +/** + * ufshcd_err_handler - Check for fatal errors + * @work: pointer to a work queue structure + */ +static void ufshcd_err_handler(struct ufs_hba *hba) +{ + u32 reg; + + if (hba->errors & INT_FATAL_ERRORS) + goto fatal_eh; + + if (hba->errors & UIC_ERROR) { + + reg = readl(hba->mmio_base + + REG_UIC_ERROR_CODE_PHY_ADAPTER_LAYER); + if (reg & UIC_DATA_LINK_LAYER_ERROR_PA_INIT) + goto fatal_eh; + } + return; +fatal_eh: + hba->ufshcd_state = UFSHCD_STATE_ERROR; + schedule_work(&hba->feh_workq); +} + +/** + * ufshcd_tmc_handler - handle task management function completion + * @hba: per adapter instance + */ +static void ufshcd_tmc_handler(struct ufs_hba *hba) +{ + u32 tm_doorbell; + + tm_doorbell = readl(hba->mmio_base + REG_UTP_TASK_REQ_DOOR_BELL); + hba->tm_condition = tm_doorbell ^ hba->outstanding_tasks; + wake_up_interruptible(&hba->ufshcd_tm_wait_queue); +} + +/** + * ufshcd_sl_intr - Interrupt service routine + * @hba: per adapter instance + * @intr_status: contains interrupts generated by the controller + */ +static void ufshcd_sl_intr(struct ufs_hba *hba, u32 intr_status) +{ + hba->errors = UFSHCD_ERROR_MASK & intr_status; + if (hba->errors) + ufshcd_err_handler(hba); + + if (intr_status & UIC_COMMAND_COMPL) + schedule_work(&hba->uic_workq); + + if (intr_status & UTP_TASK_REQ_COMPL) + ufshcd_tmc_handler(hba); + + if (intr_status & UTP_TRANSFER_REQ_COMPL) + ufshcd_transfer_req_compl(hba); +} + +/** + * ufshcd_intr - Main interrupt service routine + * @irq: irq number + * @__hba: pointer to adapter instance + * + * Returns IRQ_HANDLED - If interrupt is valid + * IRQ_NONE - If invalid interrupt + */ +static irqreturn_t ufshcd_intr(int irq, void *__hba) +{ + u32 intr_status; + irqreturn_t retval = IRQ_NONE; + struct ufs_hba *hba = __hba; + + spin_lock(hba->host->host_lock); + intr_status = readl(hba->mmio_base + REG_INTERRUPT_STATUS); + + if (intr_status) { + ufshcd_sl_intr(hba, intr_status); + + /* If UFSHCI 1.0 then clear interrupt status register */ + if (hba->ufs_version == UFSHCI_VERSION_10) + writel(intr_status, + (hba->mmio_base + REG_INTERRUPT_STATUS)); + retval = IRQ_HANDLED; + } + spin_unlock(hba->host->host_lock); + return retval; +} + +/** + * ufshcd_issue_tm_cmd - issues task management commands to controller + * @hba: per adapter instance + * @lrbp: pointer to local reference block + * + * Returns SUCCESS/FAILED + */ +static int +ufshcd_issue_tm_cmd(struct ufs_hba *hba, + struct ufshcd_lrb *lrbp, + u8 tm_function) +{ + struct utp_task_req_desc *task_req_descp; + struct utp_upiu_task_req *task_req_upiup; + struct Scsi_Host *host; + unsigned long flags; + int free_slot = 0; + int err; + + host = hba->host; + + spin_lock_irqsave(host->host_lock, flags); + + /* If task management queue is full */ + free_slot = ufshcd_get_tm_free_slot(hba); + if (free_slot >= hba->nutmrs) { + spin_unlock_irqrestore(host->host_lock, flags); + dev_err(&hba->pdev->dev, "Task management queue full\n"); + err = FAILED; + goto out; + } + + task_req_descp = hba->utmrdl_base_addr; + task_req_descp += free_slot; + + /* Configure task request descriptor */ + task_req_descp->header.dword_0 = cpu_to_le32(UTP_REQ_DESC_INT_CMD); + task_req_descp->header.dword_2 = + cpu_to_le32(OCS_INVALID_COMMAND_STATUS); + + /* Configure task request UPIU */ + task_req_upiup = + (struct utp_upiu_task_req *) task_req_descp->task_req_upiu; + task_req_upiup->header.dword_0 = + cpu_to_be32(UPIU_HEADER_DWORD(UPIU_TRANSACTION_TASK_REQ, 0, + lrbp->lun, lrbp->task_tag)); + task_req_upiup->header.dword_1 = + cpu_to_be32(UPIU_HEADER_DWORD(0, tm_function, 0, 0)); + + task_req_upiup->input_param1 = lrbp->lun; + task_req_upiup->input_param1 = + cpu_to_be32(task_req_upiup->input_param1); + task_req_upiup->input_param2 = lrbp->task_tag; + task_req_upiup->input_param2 = + cpu_to_be32(task_req_upiup->input_param2); + + /* send command to the controller */ + __set_bit(free_slot, &hba->outstanding_tasks); + writel((1 << free_slot), + (hba->mmio_base + REG_UTP_TASK_REQ_DOOR_BELL)); + + spin_unlock_irqrestore(host->host_lock, flags); + + /* wait until the task management command is completed */ + err = + wait_event_interruptible_timeout(hba->ufshcd_tm_wait_queue, + (test_bit(free_slot, + &hba->tm_condition) != 0), + 60 * HZ); + if (!err) { + dev_err(&hba->pdev->dev, + "Task management command timed-out\n"); + err = FAILED; + goto out; + } + clear_bit(free_slot, &hba->tm_condition); + return ufshcd_task_req_compl(hba, free_slot); +out: + return err; +} + +/** + * ufshcd_device_reset - reset device and abort all the pending commands + * @cmd: SCSI command pointer + * + * Returns SUCCESS/FAILED + */ +static int ufshcd_device_reset(struct scsi_cmnd *cmd) +{ + struct Scsi_Host *host; + struct ufs_hba *hba; + unsigned int tag; + u32 pos; + int err; + + host = cmd->device->host; + hba = shost_priv(host); + tag = cmd->request->tag; + + err = ufshcd_issue_tm_cmd(hba, &hba->lrb[tag], UFS_LOGICAL_RESET); + if (err) + goto out; + + for (pos = 0; pos < hba->nutrs; pos++) { + if (test_bit(pos, &hba->outstanding_reqs) && + (hba->lrb[tag].lun == hba->lrb[pos].lun)) { + + /* clear the respective UTRLCLR register bit */ + ufshcd_utrl_clear(hba, pos); + + clear_bit(pos, &hba->outstanding_reqs); + + if (hba->lrb[pos].cmd) { + scsi_dma_unmap(hba->lrb[pos].cmd); + hba->lrb[pos].cmd->result = + DID_ABORT << 16; + hba->lrb[pos].cmd->scsi_done(cmd); + hba->lrb[pos].cmd = NULL; + } + } + } /* end of for */ +out: + return err; +} + +/** + * ufshcd_host_reset - Main reset function registered with scsi layer + * @cmd: SCSI command pointer + * + * Returns SUCCESS/FAILED + */ +static int ufshcd_host_reset(struct scsi_cmnd *cmd) +{ + struct ufs_hba *hba; + + hba = shost_priv(cmd->device->host); + + if (hba->ufshcd_state == UFSHCD_STATE_RESET) + return SUCCESS; + + return (ufshcd_do_reset(hba) == SUCCESS) ? SUCCESS : FAILED; +} + +/** + * ufshcd_abort - abort a specific command + * @cmd: SCSI command pointer + * + * Returns SUCCESS/FAILED + */ +static int ufshcd_abort(struct scsi_cmnd *cmd) +{ + struct Scsi_Host *host; + struct ufs_hba *hba; + unsigned long flags; + unsigned int tag; + int err; + + host = cmd->device->host; + hba = shost_priv(host); + tag = cmd->request->tag; + + spin_lock_irqsave(host->host_lock, flags); + + /* check if command is still pending */ + if (!(test_bit(tag, &hba->outstanding_reqs))) { + err = FAILED; + spin_unlock_irqrestore(host->host_lock, flags); + goto out; + } + spin_unlock_irqrestore(host->host_lock, flags); + + err = ufshcd_issue_tm_cmd(hba, &hba->lrb[tag], UFS_ABORT_TASK); + if (err) + goto out; + + scsi_dma_unmap(cmd); + + spin_lock_irqsave(host->host_lock, flags); + + /* clear the respective UTRLCLR register bit */ + ufshcd_utrl_clear(hba, tag); + + __clear_bit(tag, &hba->outstanding_reqs); + hba->lrb[tag].cmd = NULL; + spin_unlock_irqrestore(host->host_lock, flags); +out: + return err; +} + +static struct scsi_host_template ufshcd_driver_template = { + .module = THIS_MODULE, + .name = UFSHCD, + .proc_name = UFSHCD, + .queuecommand = ufshcd_queuecommand, + .slave_alloc = ufshcd_slave_alloc, + .slave_destroy = ufshcd_slave_destroy, + .eh_abort_handler = ufshcd_abort, + .eh_device_reset_handler = ufshcd_device_reset, + .eh_host_reset_handler = ufshcd_host_reset, + .this_id = -1, + .sg_tablesize = SG_ALL, + .cmd_per_lun = UFSHCD_CMD_PER_LUN, + .can_queue = UFSHCD_CAN_QUEUE, +}; + +/** + * ufshcd_shutdown - main function to put the controller in reset state + * @pdev: pointer to PCI device handle + */ +static void ufshcd_shutdown(struct pci_dev *pdev) +{ + ufshcd_hba_stop((struct ufs_hba *)pci_get_drvdata(pdev)); +} + +#ifdef CONFIG_PM +/** + * ufshcd_suspend - suspend power management function + * @pdev: pointer to PCI device handle + * @state: power state + * + * Returns -ENOSYS + */ +static int ufshcd_suspend(struct pci_dev *pdev, pm_message_t state) +{ + /* + * TODO: + * 1. Block SCSI requests from SCSI midlayer + * 2. Change the internal driver state to non operational + * 3. Set UTRLRSR and UTMRLRSR bits to zero + * 4. Wait until outstanding commands are completed + * 5. Set HCE to zero to send the UFS host controller to reset state + */ + + return -ENOSYS; +} + +/** + * ufshcd_resume - resume power management function + * @pdev: pointer to PCI device handle + * + * Returns -ENOSYS + */ +static int ufshcd_resume(struct pci_dev *pdev) +{ + /* + * TODO: + * 1. Set HCE to 1, to start the UFS host controller + * initialization process + * 2. Set UTRLRSR and UTMRLRSR bits to 1 + * 3. Change the internal driver state to operational + * 4. Unblock SCSI requests from SCSI midlayer + */ + + return -ENOSYS; +} +#endif /* CONFIG_PM */ + +/** + * ufshcd_hba_free - free allocated memory for + * host memory space data structures + * @hba: per adapter instance + */ +static void ufshcd_hba_free(struct ufs_hba *hba) +{ + iounmap(hba->mmio_base); + ufshcd_free_hba_memory(hba); + pci_release_regions(hba->pdev); +} + +/** + * ufshcd_remove - de-allocate PCI/SCSI host and host memory space + * data structure memory + * @pdev - pointer to PCI handle + */ +static void ufshcd_remove(struct pci_dev *pdev) +{ + struct ufs_hba *hba = pci_get_drvdata(pdev); + + /* disable interrupts */ + ufshcd_int_config(hba, UFSHCD_INT_DISABLE); + free_irq(pdev->irq, hba); + + ufshcd_hba_stop(hba); + ufshcd_hba_free(hba); + + scsi_remove_host(hba->host); + scsi_host_put(hba->host); + pci_set_drvdata(pdev, NULL); + pci_clear_master(pdev); + pci_disable_device(pdev); +} + +/** + * ufshcd_set_dma_mask - Set dma mask based on the controller + * addressing capability + * @pdev: PCI device structure + * + * Returns 0 for success, non-zero for failure + */ +static int ufshcd_set_dma_mask(struct ufs_hba *hba) +{ + int err; + u64 dma_mask; + + /* + * If controller supports 64 bit addressing mode, then set the DMA + * mask to 64-bit, else set the DMA mask to 32-bit + */ + if (hba->capabilities & MASK_64_ADDRESSING_SUPPORT) + dma_mask = DMA_BIT_MASK(64); + else + dma_mask = DMA_BIT_MASK(32); + + err = pci_set_dma_mask(hba->pdev, dma_mask); + if (err) + return err; + + err = pci_set_consistent_dma_mask(hba->pdev, dma_mask); + + return err; +} + +/** + * ufshcd_probe - probe routine of the driver + * @pdev: pointer to PCI device handle + * @id: PCI device id + * + * Returns 0 on success, non-zero value on failure + */ +static int __devinit +ufshcd_probe(struct pci_dev *pdev, const struct pci_device_id *id) +{ + struct Scsi_Host *host; + struct ufs_hba *hba; + int err; + + err = pci_enable_device(pdev); + if (err) { + dev_err(&pdev->dev, "pci_enable_device failed\n"); + goto out_error; + } + + pci_set_master(pdev); + + host = scsi_host_alloc(&ufshcd_driver_template, + sizeof(struct ufs_hba)); + if (!host) { + dev_err(&pdev->dev, "scsi_host_alloc failed\n"); + err = -ENOMEM; + goto out_disable; + } + hba = shost_priv(host); + + err = pci_request_regions(pdev, UFSHCD); + if (err < 0) { + dev_err(&pdev->dev, "request regions failed\n"); + goto out_disable; + } + + hba->mmio_base = pci_ioremap_bar(pdev, 0); + if (!hba->mmio_base) { + dev_err(&pdev->dev, "memory map failed\n"); + err = -ENOMEM; + goto out_release_regions; + } + + hba->host = host; + hba->pdev = pdev; + + /* Read capabilities registers */ + ufshcd_hba_capabilities(hba); + + /* Get UFS version supported by the controller */ + hba->ufs_version = ufshcd_get_ufs_version(hba); + + err = ufshcd_set_dma_mask(hba); + if (err) { + dev_err(&pdev->dev, "set dma mask failed\n"); + goto out_iounmap; + } + + /* Allocate memory for host memory space */ + err = ufshcd_memory_alloc(hba); + if (err) { + dev_err(&pdev->dev, "Memory allocation failed\n"); + goto out_iounmap; + } + + /* Configure LRB */ + ufshcd_host_memory_configure(hba); + + host->can_queue = hba->nutrs; + host->cmd_per_lun = hba->nutrs; + host->max_id = UFSHCD_MAX_ID; + host->max_lun = UFSHCD_MAX_LUNS; + host->max_channel = UFSHCD_MAX_CHANNEL; + host->unique_id = host->host_no; + host->max_cmd_len = MAX_CDB_SIZE; + + /* Initailize wait queue for task management */ + init_waitqueue_head(&hba->ufshcd_tm_wait_queue); + + /* Initialize work queues */ + INIT_WORK(&hba->uic_workq, ufshcd_uic_cc_handler); + INIT_WORK(&hba->feh_workq, ufshcd_fatal_err_handler); + + /* IRQ registration */ + err = request_irq(pdev->irq, ufshcd_intr, IRQF_SHARED, UFSHCD, hba); + if (err) { + dev_err(&pdev->dev, "request irq failed\n"); + goto out_lrb_free; + } + + /* Enable SCSI tag mapping */ + err = scsi_init_shared_tag_map(host, host->can_queue); + if (err) { + dev_err(&pdev->dev, "init shared queue failed\n"); + goto out_free_irq; + } + + pci_set_drvdata(pdev, hba); + + err = scsi_add_host(host, &pdev->dev); + if (err) { + dev_err(&pdev->dev, "scsi_add_host failed\n"); + goto out_free_irq; + } + + /* Initialization routine */ + err = ufshcd_initialize_hba(hba); + if (err) { + dev_err(&pdev->dev, "Initialization failed\n"); + goto out_free_irq; + } + + return 0; + +out_free_irq: + free_irq(pdev->irq, hba); +out_lrb_free: + ufshcd_free_hba_memory(hba); +out_iounmap: + iounmap(hba->mmio_base); +out_release_regions: + pci_release_regions(pdev); +out_disable: + scsi_host_put(host); + pci_clear_master(pdev); + pci_disable_device(pdev); +out_error: + return err; +} + +static DEFINE_PCI_DEVICE_TABLE(ufshcd_pci_tbl) = { + { PCI_VENDOR_ID_SAMSUNG, 0xC00C, PCI_ANY_ID, PCI_ANY_ID, 0, 0, 0 }, + { } /* terminate list */ +}; + +MODULE_DEVICE_TABLE(pci, ufshcd_pci_tbl); + +static struct pci_driver ufshcd_pci_driver = { + .name = UFSHCD, + .id_table = ufshcd_pci_tbl, + .probe = ufshcd_probe, + .remove = __devexit_p(ufshcd_remove), + .shutdown = ufshcd_shutdown, +#ifdef CONFIG_PM + .suspend = ufshcd_suspend, + .resume = ufshcd_resume, +#endif +}; + +/** + * ufshcd_init - Driver registration routine + */ +static int __init ufshcd_init(void) +{ + return pci_register_driver(&ufshcd_pci_driver); +} +module_init(ufshcd_init); + +/** + * ufshcd_exit - Driver exit clean-up routine + */ +static void __exit ufshcd_exit(void) +{ + pci_unregister_driver(&ufshcd_pci_driver); +} +module_exit(ufshcd_exit); + + +MODULE_AUTHOR("Santosh Yaragnavi <santosh.sy@samsung.com>, " + "Vinayak Holikatti <h.vinayak@samsung.com>"); +MODULE_DESCRIPTION("Generic UFS host controller driver"); +MODULE_LICENSE("GPL"); +MODULE_VERSION(UFSHCD_DRIVER_VERSION); |