forked from Minki/linux
66ec6d5940
Background operations in the UFS device can be disabled by the host to reduce the response latency of transfer requests. Add support for enabling/disabling the background operations during runtime suspend/resume of the device. If the device is in critical need of BKOPS it will raise an URGENT_BKOPS exception which should be handled by the host to make sure the device performs as expected. During bootup, the BKOPS is enabled in the device by default. The disable of BKOPS is supported only when the driver supports runtime suspend/resume operations as the runtime PM framework provides a way to determine the device idleness and hence BKOPS can be managed effectively. During runtime resume the BKOPS is disabled to reduce latency and during runtime suspend the BKOPS is enabled to allow device to carry out idle time BKOPS. In some cases where the BKOPS is disabled during runtime resume and due to continuous data transfers the runtime suspend is not triggered, the BKOPS is enabled when the device raises a level-2 exception (outstanding operations - performance impact). Signed-off-by: Sujit Reddy Thumma <sthumma@codeaurora.org> Signed-off-by: Santosh Y <santoshsy@gmail.com> Signed-off-by: James Bottomley <JBottomley@Parallels.com>
267 lines
7.7 KiB
C
267 lines
7.7 KiB
C
/*
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* Universal Flash Storage Host controller driver
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*
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* This code is based on drivers/scsi/ufs/ufshcd.h
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* Copyright (C) 2011-2013 Samsung India Software Operations
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*
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* Authors:
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* Santosh Yaraganavi <santosh.sy@samsung.com>
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* Vinayak Holikatti <h.vinayak@samsung.com>
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version 2
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* of the License, or (at your option) any later version.
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* See the COPYING file in the top-level directory or visit
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* <http://www.gnu.org/licenses/gpl-2.0.html>
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* This program is provided "AS IS" and "WITH ALL FAULTS" and
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* without warranty of any kind. You are solely responsible for
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* determining the appropriateness of using and distributing
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* the program and assume all risks associated with your exercise
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* of rights with respect to the program, including but not limited
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* to infringement of third party rights, the risks and costs of
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* program errors, damage to or loss of data, programs or equipment,
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* and unavailability or interruption of operations. Under no
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* circumstances will the contributor of this Program be liable for
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* any damages of any kind arising from your use or distribution of
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* this program.
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*/
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#ifndef _UFSHCD_H
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#define _UFSHCD_H
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#include <linux/module.h>
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#include <linux/kernel.h>
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#include <linux/init.h>
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#include <linux/interrupt.h>
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#include <linux/io.h>
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#include <linux/delay.h>
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#include <linux/slab.h>
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#include <linux/spinlock.h>
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#include <linux/workqueue.h>
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#include <linux/errno.h>
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#include <linux/types.h>
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#include <linux/wait.h>
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#include <linux/bitops.h>
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#include <linux/pm_runtime.h>
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#include <linux/clk.h>
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#include <linux/completion.h>
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#include <asm/irq.h>
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#include <asm/byteorder.h>
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#include <scsi/scsi.h>
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#include <scsi/scsi_cmnd.h>
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#include <scsi/scsi_host.h>
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#include <scsi/scsi_tcq.h>
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#include <scsi/scsi_dbg.h>
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#include <scsi/scsi_eh.h>
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#include "ufs.h"
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#include "ufshci.h"
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#define UFSHCD "ufshcd"
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#define UFSHCD_DRIVER_VERSION "0.2"
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enum dev_cmd_type {
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DEV_CMD_TYPE_NOP = 0x0,
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DEV_CMD_TYPE_QUERY = 0x1,
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};
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/**
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* struct uic_command - UIC command structure
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* @command: UIC command
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* @argument1: UIC command argument 1
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* @argument2: UIC command argument 2
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* @argument3: UIC command argument 3
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* @cmd_active: Indicate if UIC command is outstanding
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* @result: UIC command result
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* @done: UIC command completion
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*/
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struct uic_command {
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u32 command;
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u32 argument1;
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u32 argument2;
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u32 argument3;
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int cmd_active;
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int result;
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struct completion done;
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};
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/**
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* struct ufshcd_lrb - local reference block
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* @utr_descriptor_ptr: UTRD address of the command
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* @ucd_req_ptr: UCD address of the command
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* @ucd_rsp_ptr: Response UPIU address for this command
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* @ucd_prdt_ptr: PRDT address of the command
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* @cmd: pointer to SCSI command
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* @sense_buffer: pointer to sense buffer address of the SCSI command
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* @sense_bufflen: Length of the sense buffer
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* @scsi_status: SCSI status of the command
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* @command_type: SCSI, UFS, Query.
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* @task_tag: Task tag of the command
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* @lun: LUN of the command
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* @intr_cmd: Interrupt command (doesn't participate in interrupt aggregation)
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*/
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struct ufshcd_lrb {
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struct utp_transfer_req_desc *utr_descriptor_ptr;
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struct utp_upiu_req *ucd_req_ptr;
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struct utp_upiu_rsp *ucd_rsp_ptr;
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struct ufshcd_sg_entry *ucd_prdt_ptr;
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struct scsi_cmnd *cmd;
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u8 *sense_buffer;
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unsigned int sense_bufflen;
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int scsi_status;
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int command_type;
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int task_tag;
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unsigned int lun;
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bool intr_cmd;
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};
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/**
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* struct ufs_query - holds relevent data structures for query request
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* @request: request upiu and function
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* @descriptor: buffer for sending/receiving descriptor
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* @response: response upiu and response
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*/
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struct ufs_query {
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struct ufs_query_req request;
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u8 *descriptor;
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struct ufs_query_res response;
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};
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/**
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* struct ufs_dev_cmd - all assosiated fields with device management commands
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* @type: device management command type - Query, NOP OUT
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* @lock: lock to allow one command at a time
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* @complete: internal commands completion
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* @tag_wq: wait queue until free command slot is available
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*/
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struct ufs_dev_cmd {
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enum dev_cmd_type type;
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struct mutex lock;
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struct completion *complete;
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wait_queue_head_t tag_wq;
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struct ufs_query query;
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};
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/**
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* struct ufs_hba - per adapter private structure
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* @mmio_base: UFSHCI base register address
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* @ucdl_base_addr: UFS Command Descriptor base address
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* @utrdl_base_addr: UTP Transfer Request Descriptor base address
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* @utmrdl_base_addr: UTP Task Management Descriptor base address
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* @ucdl_dma_addr: UFS Command Descriptor DMA address
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* @utrdl_dma_addr: UTRDL DMA address
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* @utmrdl_dma_addr: UTMRDL DMA address
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* @host: Scsi_Host instance of the driver
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* @dev: device handle
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* @lrb: local reference block
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* @lrb_in_use: lrb in use
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* @outstanding_tasks: Bits representing outstanding task requests
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* @outstanding_reqs: Bits representing outstanding transfer requests
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* @capabilities: UFS Controller Capabilities
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* @nutrs: Transfer Request Queue depth supported by controller
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* @nutmrs: Task Management Queue depth supported by controller
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* @ufs_version: UFS Version to which controller complies
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* @irq: Irq number of the controller
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* @active_uic_cmd: handle of active UIC command
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* @uic_cmd_mutex: mutex for uic command
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* @ufshcd_tm_wait_queue: wait queue for task management
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* @tm_condition: condition variable for task management
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* @ufshcd_state: UFSHCD states
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* @intr_mask: Interrupt Mask Bits
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* @ee_ctrl_mask: Exception event control mask
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* @feh_workq: Work queue for fatal controller error handling
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* @eeh_work: Worker to handle exception events
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* @errors: HBA errors
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* @dev_cmd: ufs device management command information
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* @auto_bkops_enabled: to track whether bkops is enabled in device
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*/
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struct ufs_hba {
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void __iomem *mmio_base;
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/* Virtual memory reference */
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struct utp_transfer_cmd_desc *ucdl_base_addr;
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struct utp_transfer_req_desc *utrdl_base_addr;
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struct utp_task_req_desc *utmrdl_base_addr;
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/* DMA memory reference */
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dma_addr_t ucdl_dma_addr;
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dma_addr_t utrdl_dma_addr;
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dma_addr_t utmrdl_dma_addr;
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struct Scsi_Host *host;
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struct device *dev;
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struct ufshcd_lrb *lrb;
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unsigned long lrb_in_use;
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unsigned long outstanding_tasks;
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unsigned long outstanding_reqs;
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u32 capabilities;
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int nutrs;
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int nutmrs;
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u32 ufs_version;
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unsigned int irq;
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struct uic_command *active_uic_cmd;
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struct mutex uic_cmd_mutex;
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wait_queue_head_t ufshcd_tm_wait_queue;
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unsigned long tm_condition;
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u32 ufshcd_state;
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u32 intr_mask;
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u16 ee_ctrl_mask;
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/* Work Queues */
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struct work_struct feh_workq;
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struct work_struct eeh_work;
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/* HBA Errors */
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u32 errors;
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/* Device management request data */
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struct ufs_dev_cmd dev_cmd;
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bool auto_bkops_enabled;
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};
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#define ufshcd_writel(hba, val, reg) \
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writel((val), (hba)->mmio_base + (reg))
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#define ufshcd_readl(hba, reg) \
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readl((hba)->mmio_base + (reg))
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int ufshcd_init(struct device *, struct ufs_hba ** , void __iomem * ,
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unsigned int);
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void ufshcd_remove(struct ufs_hba *);
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/**
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* ufshcd_hba_stop - Send controller to reset state
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* @hba: per adapter instance
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*/
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static inline void ufshcd_hba_stop(struct ufs_hba *hba)
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{
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ufshcd_writel(hba, CONTROLLER_DISABLE, REG_CONTROLLER_ENABLE);
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}
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static inline void check_upiu_size(void)
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{
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BUILD_BUG_ON(ALIGNED_UPIU_SIZE <
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GENERAL_UPIU_REQUEST_SIZE + QUERY_DESC_MAX_SIZE);
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}
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extern int ufshcd_runtime_suspend(struct ufs_hba *hba);
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extern int ufshcd_runtime_resume(struct ufs_hba *hba);
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extern int ufshcd_runtime_idle(struct ufs_hba *hba);
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#endif /* End of Header */
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