/* Driver for Realtek PCI-Express card reader
 *
 * Copyright(c) 2009-2013 Realtek Semiconductor Corp. All rights reserved.
 *
 * 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, 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.
 *
 * You should have received a copy of the GNU General Public License along
 * with this program; if not, see <http://www.gnu.org/licenses/>.
 *
 * Author:
 *   Wei WANG (wei_wang@realsil.com.cn)
 *   Micky Ching (micky_ching@realsil.com.cn)
 */

#include <linux/blkdev.h>
#include <linux/kthread.h>
#include <linux/sched.h>
#include <linux/workqueue.h>

#include "rtsx.h"
#include "ms.h"
#include "sd.h"
#include "xd.h"

MODULE_DESCRIPTION("Realtek PCI-Express card reader rts5208/rts5288 driver");
MODULE_LICENSE("GPL");

static unsigned int delay_use = 1;
module_param(delay_use, uint, 0644);
MODULE_PARM_DESC(delay_use, "seconds to delay before using a new device");

static int ss_en;
module_param(ss_en, int, 0644);
MODULE_PARM_DESC(ss_en, "enable selective suspend");

static int ss_interval = 50;
module_param(ss_interval, int, 0644);
MODULE_PARM_DESC(ss_interval, "Interval to enter ss state in seconds");

static int auto_delink_en;
module_param(auto_delink_en, int, 0644);
MODULE_PARM_DESC(auto_delink_en, "enable auto delink");

static unsigned char aspm_l0s_l1_en;
module_param(aspm_l0s_l1_en, byte, 0644);
MODULE_PARM_DESC(aspm_l0s_l1_en, "enable device aspm");

static int msi_en;
module_param(msi_en, int, 0644);
MODULE_PARM_DESC(msi_en, "enable msi");

static irqreturn_t rtsx_interrupt(int irq, void *dev_id);

/***********************************************************************
 * Host functions
 ***********************************************************************/

static const char *host_info(struct Scsi_Host *host)
{
        return "SCSI emulation for PCI-Express Mass Storage devices";
}

static int slave_alloc(struct scsi_device *sdev)
{
        /*
         * Set the INQUIRY transfer length to 36.  We don't use any of
         * the extra data and many devices choke if asked for more or
         * less than 36 bytes.
         */
        sdev->inquiry_len = 36;
        return 0;
}

static int slave_configure(struct scsi_device *sdev)
{
        /*
         * Scatter-gather buffers (all but the last) must have a length
         * divisible by the bulk maxpacket size.  Otherwise a data packet
         * would end up being short, causing a premature end to the data
         * transfer.  Since high-speed bulk pipes have a maxpacket size
         * of 512, we'll use that as the scsi device queue's DMA alignment
         * mask.  Guaranteeing proper alignment of the first buffer will
         * have the desired effect because, except at the beginning and
         * the end, scatter-gather buffers follow page boundaries.
         */
        blk_queue_dma_alignment(sdev->request_queue, (512 - 1));

        /* Set the SCSI level to at least 2.  We'll leave it at 3 if that's
         * what is originally reported.  We need this to avoid confusing
         * the SCSI layer with devices that report 0 or 1, but need 10-byte
         * commands (ala ATAPI devices behind certain bridges, or devices
         * which simply have broken INQUIRY data).
         *
         * NOTE: This means /dev/sg programs (ala cdrecord) will get the
         * actual information.  This seems to be the preference for
         * programs like that.
         *
         * NOTE: This also means that /proc/scsi/scsi and sysfs may report
         * the actual value or the modified one, depending on where the
         * data comes from.
         */
        if (sdev->scsi_level < SCSI_2)
                sdev->scsi_level = sdev->sdev_target->scsi_level = SCSI_2;

        return 0;
}

/***********************************************************************
 * /proc/scsi/ functions
 ***********************************************************************/

/* we use this macro to help us write into the buffer */
#undef SPRINTF
#define SPRINTF(args...) \
        do { if (pos < buffer+length) pos += sprintf(pos, ## args); } while (0)

/* queue a command */
/* This is always called with scsi_lock(host) held */
static int queuecommand_lck(struct scsi_cmnd *srb,
                        void (*done)(struct scsi_cmnd *))
{
        struct rtsx_dev *dev = host_to_rtsx(srb->device->host);
        struct rtsx_chip *chip = dev->chip;

        /* check for state-transition errors */
        if (chip->srb) {
                dev_err(&dev->pci->dev, "Error: chip->srb = %p\n",
                        chip->srb);
                return SCSI_MLQUEUE_HOST_BUSY;
        }

        /* fail the command if we are disconnecting */
        if (rtsx_chk_stat(chip, RTSX_STAT_DISCONNECT)) {
                dev_info(&dev->pci->dev, "Fail command during disconnect\n");
                srb->result = DID_NO_CONNECT << 16;
                done(srb);
                return 0;
        }

        /* enqueue the command and wake up the control thread */
        srb->scsi_done = done;
        chip->srb = srb;
        complete(&dev->cmnd_ready);

        return 0;
}

static DEF_SCSI_QCMD(queuecommand)

/***********************************************************************
 * Error handling functions
 ***********************************************************************/

/* Command timeout and abort */
static int command_abort(struct scsi_cmnd *srb)
{
        struct Scsi_Host *host = srb->device->host;
        struct rtsx_dev *dev = host_to_rtsx(host);
        struct rtsx_chip *chip = dev->chip;

        dev_info(&dev->pci->dev, "%s called\n", __func__);

        scsi_lock(host);

        /* Is this command still active? */
        if (chip->srb != srb) {
                scsi_unlock(host);
                dev_info(&dev->pci->dev, "-- nothing to abort\n");
                return FAILED;
        }

        rtsx_set_stat(chip, RTSX_STAT_ABORT);

        scsi_unlock(host);

        /* Wait for the aborted command to finish */
        wait_for_completion(&dev->notify);

        return SUCCESS;
}

/*
 * This invokes the transport reset mechanism to reset the state of the
 * device
 */
static int device_reset(struct scsi_cmnd *srb)
{
        int result = 0;
        struct rtsx_dev *dev = host_to_rtsx(srb->device->host);

        dev_info(&dev->pci->dev, "%s called\n", __func__);

        return result < 0 ? FAILED : SUCCESS;
}

/* Simulate a SCSI bus reset by resetting the device's USB port. */
static int bus_reset(struct scsi_cmnd *srb)
{
        int result = 0;
        struct rtsx_dev *dev = host_to_rtsx(srb->device->host);

        dev_info(&dev->pci->dev, "%s called\n", __func__);

        return result < 0 ? FAILED : SUCCESS;
}

/*
 * this defines our host template, with which we'll allocate hosts
 */

static struct scsi_host_template rtsx_host_template = {
        /* basic userland interface stuff */
        .name =                         CR_DRIVER_NAME,
        .proc_name =                    CR_DRIVER_NAME,
        .info =                         host_info,

        /* command interface -- queued only */
        .queuecommand =                 queuecommand,

        /* error and abort handlers */
        .eh_abort_handler =             command_abort,
        .eh_device_reset_handler =      device_reset,
        .eh_bus_reset_handler =         bus_reset,

        /* queue commands only, only one command per LUN */
        .can_queue =                    1,

        /* unknown initiator id */
        .this_id =                      -1,

        .slave_alloc =                  slave_alloc,
        .slave_configure =              slave_configure,

        /* lots of sg segments can be handled */
        .sg_tablesize =                 SG_ALL,

        /* limit the total size of a transfer to 120 KB */
        .max_sectors =                  240,

        /* merge commands... this seems to help performance, but
         * periodically someone should test to see which setting is more
         * optimal.
         */
        .use_clustering =               1,

        /* emulated HBA */
        .emulated =                     1,

        /* we do our own delay after a device or bus reset */
        .skip_settle_delay =            1,

        /* module management */
        .module =                       THIS_MODULE
};

static int rtsx_acquire_irq(struct rtsx_dev *dev)
{
        struct rtsx_chip *chip = dev->chip;

        dev_info(&dev->pci->dev, "%s: chip->msi_en = %d, pci->irq = %d\n",
                 __func__, chip->msi_en, dev->pci->irq);

        if (request_irq(dev->pci->irq, rtsx_interrupt,
                        chip->msi_en ? 0 : IRQF_SHARED,
                        CR_DRIVER_NAME, dev)) {
                dev_err(&dev->pci->dev,
                        "rtsx: unable to grab IRQ %d, disabling device\n",
                        dev->pci->irq);
                return -1;
        }

        dev->irq = dev->pci->irq;
        pci_intx(dev->pci, !chip->msi_en);

        return 0;
}

int rtsx_read_pci_cfg_byte(u8 bus, u8 dev, u8 func, u8 offset, u8 *val)
{
        struct pci_dev *pdev;
        u8 data;
        u8 devfn = (dev << 3) | func;

        pdev = pci_get_bus_and_slot(bus, devfn);
        if (!pdev)
                return -1;

        pci_read_config_byte(pdev, offset, &data);
        if (val)
                *val = data;

        return 0;
}

#ifdef CONFIG_PM
/*
 * power management
 */
static int rtsx_suspend(struct pci_dev *pci, pm_message_t state)
{
        struct rtsx_dev *dev = pci_get_drvdata(pci);
        struct rtsx_chip *chip;

        if (!dev)
                return 0;

        /* lock the device pointers */
        mutex_lock(&(dev->dev_mutex));

        chip = dev->chip;

        rtsx_do_before_power_down(chip, PM_S3);

        if (dev->irq >= 0) {
                free_irq(dev->irq, (void *)dev);
                dev->irq = -1;
        }

        if (chip->msi_en)
                pci_disable_msi(pci);

        pci_save_state(pci);
        pci_enable_wake(pci, pci_choose_state(pci, state), 1);
        pci_disable_device(pci);
        pci_set_power_state(pci, pci_choose_state(pci, state));

        /* unlock the device pointers */
        mutex_unlock(&dev->dev_mutex);

        return 0;
}

static int rtsx_resume(struct pci_dev *pci)
{
        struct rtsx_dev *dev = pci_get_drvdata(pci);
        struct rtsx_chip *chip;

        if (!dev)
                return 0;

        chip = dev->chip;

        /* lock the device pointers */
        mutex_lock(&(dev->dev_mutex));

        pci_set_power_state(pci, PCI_D0);
        pci_restore_state(pci);
        if (pci_enable_device(pci) < 0) {
                dev_err(&dev->pci->dev,
                        "%s: pci_enable_device failed, disabling device\n",
                        CR_DRIVER_NAME);
                /* unlock the device pointers */
                mutex_unlock(&dev->dev_mutex);
                return -EIO;
        }
        pci_set_master(pci);

        if (chip->msi_en) {
                if (pci_enable_msi(pci) < 0)
                        chip->msi_en = 0;
        }

        if (rtsx_acquire_irq(dev) < 0) {
                /* unlock the device pointers */
                mutex_unlock(&dev->dev_mutex);
                return -EIO;
        }

        rtsx_write_register(chip, HOST_SLEEP_STATE, 0x03, 0x00);
        rtsx_init_chip(chip);

        /* unlock the device pointers */
        mutex_unlock(&dev->dev_mutex);

        return 0;
}
#endif /* CONFIG_PM */

static void rtsx_shutdown(struct pci_dev *pci)
{
        struct rtsx_dev *dev = pci_get_drvdata(pci);
        struct rtsx_chip *chip;

        if (!dev)
                return;

        chip = dev->chip;

        rtsx_do_before_power_down(chip, PM_S1);

        if (dev->irq >= 0) {
                free_irq(dev->irq, (void *)dev);
                dev->irq = -1;
        }

        if (chip->msi_en)
                pci_disable_msi(pci);

        pci_disable_device(pci);
}

static int rtsx_control_thread(void *__dev)
{
        struct rtsx_dev *dev = __dev;
        struct rtsx_chip *chip = dev->chip;
        struct Scsi_Host *host = rtsx_to_host(dev);

        for (;;) {
                if (wait_for_completion_interruptible(&dev->cmnd_ready))
                        break;

                /* lock the device pointers */
                mutex_lock(&(dev->dev_mutex));

                /* if the device has disconnected, we are free to exit */
                if (rtsx_chk_stat(chip, RTSX_STAT_DISCONNECT)) {
                        dev_info(&dev->pci->dev, "-- rtsx-control exiting\n");
                        mutex_unlock(&dev->dev_mutex);
                        break;
                }

                /* lock access to the state */
                scsi_lock(host);

                /* has the command aborted ? */
                if (rtsx_chk_stat(chip, RTSX_STAT_ABORT)) {
                        chip->srb->result = DID_ABORT << 16;
                        goto SkipForAbort;
                }

                scsi_unlock(host);

                /* reject the command if the direction indicator
                 * is UNKNOWN
                 */
                if (chip->srb->sc_data_direction == DMA_BIDIRECTIONAL) {
                        dev_err(&dev->pci->dev, "UNKNOWN data direction\n");
                        chip->srb->result = DID_ERROR << 16;
                }

                /* reject if target != 0 or if LUN is higher than
                 * the maximum known LUN
                 */
                else if (chip->srb->device->id) {
                        dev_err(&dev->pci->dev, "Bad target number (%d:%d)\n",
                                chip->srb->device->id,
                                (u8)chip->srb->device->lun);
                        chip->srb->result = DID_BAD_TARGET << 16;
                }

                else if (chip->srb->device->lun > chip->max_lun) {
                        dev_err(&dev->pci->dev, "Bad LUN (%d:%d)\n",
                                chip->srb->device->id,
                                (u8)chip->srb->device->lun);
                        chip->srb->result = DID_BAD_TARGET << 16;
                }

                /* we've got a command, let's do it! */
                else {
                        scsi_show_command(chip);
                        rtsx_invoke_transport(chip->srb, chip);
                }

                /* lock access to the state */
                scsi_lock(host);

                /* did the command already complete because of a disconnect? */
                if (!chip->srb)
                        ;               /* nothing to do */

                /* indicate that the command is done */
                else if (chip->srb->result != DID_ABORT << 16) {
                        chip->srb->scsi_done(chip->srb);
                } else {
SkipForAbort:
                        dev_err(&dev->pci->dev, "scsi command aborted\n");
                }

                if (rtsx_chk_stat(chip, RTSX_STAT_ABORT)) {
                        complete(&(dev->notify));

                        rtsx_set_stat(chip, RTSX_STAT_IDLE);
                }

                /* finished working on this command */
                chip->srb = NULL;
                scsi_unlock(host);

                /* unlock the device pointers */
                mutex_unlock(&dev->dev_mutex);
        } /* for (;;) */

        /* notify the exit routine that we're actually exiting now
         *
         * complete()/wait_for_completion() is similar to up()/down(),
         * except that complete() is safe in the case where the structure
         * is getting deleted in a parallel mode of execution (i.e. just
         * after the down() -- that's necessary for the thread-shutdown
         * case.
         *
         * complete_and_exit() goes even further than this -- it is safe in
         * the case that the thread of the caller is going away (not just
         * the structure) -- this is necessary for the module-remove case.
         * This is important in preemption kernels, which transfer the flow
         * of execution immediately upon a complete().
         */
        complete_and_exit(&dev->control_exit, 0);
}

static int rtsx_polling_thread(void *__dev)
{
        struct rtsx_dev *dev = __dev;
        struct rtsx_chip *chip = dev->chip;
        struct sd_info *sd_card = &(chip->sd_card);
        struct xd_info *xd_card = &(chip->xd_card);
        struct ms_info *ms_card = &(chip->ms_card);

        sd_card->cleanup_counter = 0;
        xd_card->cleanup_counter = 0;
        ms_card->cleanup_counter = 0;

        /* Wait until SCSI scan finished */
        wait_timeout((delay_use + 5) * 1000);

        for (;;) {

                set_current_state(TASK_INTERRUPTIBLE);
                schedule_timeout(msecs_to_jiffies(POLLING_INTERVAL));

                /* lock the device pointers */
                mutex_lock(&(dev->dev_mutex));

                /* if the device has disconnected, we are free to exit */
                if (rtsx_chk_stat(chip, RTSX_STAT_DISCONNECT)) {
                        dev_info(&dev->pci->dev, "-- rtsx-polling exiting\n");
                        mutex_unlock(&dev->dev_mutex);
                        break;
                }

                mutex_unlock(&dev->dev_mutex);

                mspro_polling_format_status(chip);

                /* lock the device pointers */
                mutex_lock(&(dev->dev_mutex));

                rtsx_polling_func(chip);

                /* unlock the device pointers */
                mutex_unlock(&dev->dev_mutex);
        }

        complete_and_exit(&dev->polling_exit, 0);
}

/*
 * interrupt handler
 */
static irqreturn_t rtsx_interrupt(int irq, void *dev_id)
{
        struct rtsx_dev *dev = dev_id;
        struct rtsx_chip *chip;
        int retval;
        u32 status;

        if (dev)
                chip = dev->chip;
        else
                return IRQ_NONE;

        if (!chip)
                return IRQ_NONE;

        spin_lock(&dev->reg_lock);

        retval = rtsx_pre_handle_interrupt(chip);
        if (retval == STATUS_FAIL) {
                spin_unlock(&dev->reg_lock);
                if (chip->int_reg == 0xFFFFFFFF)
                        return IRQ_HANDLED;
                return IRQ_NONE;
        }

        status = chip->int_reg;

        if (dev->check_card_cd) {
                if (!(dev->check_card_cd & status)) {
                        /* card not exist, return TRANS_RESULT_FAIL */
                        dev->trans_result = TRANS_RESULT_FAIL;
                        if (dev->done)
                                complete(dev->done);
                        goto Exit;
                }
        }

        if (status & (NEED_COMPLETE_INT | DELINK_INT)) {
                if (status & (TRANS_FAIL_INT | DELINK_INT)) {
                        if (status & DELINK_INT)
                                RTSX_SET_DELINK(chip);
                        dev->trans_result = TRANS_RESULT_FAIL;
                        if (dev->done)
                                complete(dev->done);
                } else if (status & TRANS_OK_INT) {
                        dev->trans_result = TRANS_RESULT_OK;
                        if (dev->done)
                                complete(dev->done);
                } else if (status & DATA_DONE_INT) {
                        dev->trans_result = TRANS_NOT_READY;
                        if (dev->done && (dev->trans_state == STATE_TRANS_SG))
                                complete(dev->done);
                }
        }

Exit:
        spin_unlock(&dev->reg_lock);
        return IRQ_HANDLED;
}

/* Release all our dynamic resources */
static void rtsx_release_resources(struct rtsx_dev *dev)
{
        dev_info(&dev->pci->dev, "-- %s\n", __func__);

        /* Tell the control thread to exit.  The SCSI host must
         * already have been removed so it won't try to queue
         * any more commands.
         */
        dev_info(&dev->pci->dev, "-- sending exit command to thread\n");
        complete(&dev->cmnd_ready);
        if (dev->ctl_thread)
                wait_for_completion(&dev->control_exit);
        if (dev->polling_thread)
                wait_for_completion(&dev->polling_exit);

        wait_timeout(200);

        if (dev->rtsx_resv_buf) {
                dev->chip->host_cmds_ptr = NULL;
                dev->chip->host_sg_tbl_ptr = NULL;
        }

        if (dev->irq > 0)
                free_irq(dev->irq, (void *)dev);
        if (dev->chip->msi_en)
                pci_disable_msi(dev->pci);
        if (dev->remap_addr)
                iounmap(dev->remap_addr);

        rtsx_release_chip(dev->chip);
        kfree(dev->chip);
}

/*
 * First stage of disconnect processing: stop all commands and remove
 * the host
 */
static void quiesce_and_remove_host(struct rtsx_dev *dev)
{
        struct Scsi_Host *host = rtsx_to_host(dev);
        struct rtsx_chip *chip = dev->chip;

        /*
         * Prevent new transfers, stop the current command, and
         * interrupt a SCSI-scan or device-reset delay
         */
        mutex_lock(&dev->dev_mutex);
        scsi_lock(host);
        rtsx_set_stat(chip, RTSX_STAT_DISCONNECT);
        scsi_unlock(host);
        mutex_unlock(&dev->dev_mutex);
        wake_up(&dev->delay_wait);
        wait_for_completion(&dev->scanning_done);

        /* Wait some time to let other threads exist */
        wait_timeout(100);

        /*
         * queuecommand won't accept any new commands and the control
         * thread won't execute a previously-queued command.  If there
         * is such a command pending, complete it with an error.
         */
        mutex_lock(&dev->dev_mutex);
        if (chip->srb) {
                chip->srb->result = DID_NO_CONNECT << 16;
                scsi_lock(host);
                chip->srb->scsi_done(dev->chip->srb);
                chip->srb = NULL;
                scsi_unlock(host);
        }
        mutex_unlock(&dev->dev_mutex);

        /* Now we own no commands so it's safe to remove the SCSI host */
        scsi_remove_host(host);
}

/* Second stage of disconnect processing: deallocate all resources */
static void release_everything(struct rtsx_dev *dev)
{
        rtsx_release_resources(dev);

        /*
         * Drop our reference to the host; the SCSI core will free it
         * when the refcount becomes 0.
         */
        scsi_host_put(rtsx_to_host(dev));
}

/* Thread to carry out delayed SCSI-device scanning */
static int rtsx_scan_thread(void *__dev)
{
        struct rtsx_dev *dev = __dev;
        struct rtsx_chip *chip = dev->chip;

        /* Wait for the timeout to expire or for a disconnect */
        if (delay_use > 0) {
                dev_info(&dev->pci->dev,
                         "%s: waiting for device to settle before scanning\n",
                         CR_DRIVER_NAME);
                wait_event_interruptible_timeout(dev->delay_wait,
                                rtsx_chk_stat(chip, RTSX_STAT_DISCONNECT),
                                delay_use * HZ);
        }

        /* If the device is still connected, perform the scanning */
        if (!rtsx_chk_stat(chip, RTSX_STAT_DISCONNECT)) {
                scsi_scan_host(rtsx_to_host(dev));
                dev_info(&dev->pci->dev, "%s: device scan complete\n",
                         CR_DRIVER_NAME);

                /* Should we unbind if no devices were detected? */
        }

        complete_and_exit(&dev->scanning_done, 0);
}

static void rtsx_init_options(struct rtsx_chip *chip)
{
        chip->vendor_id = chip->rtsx->pci->vendor;
        chip->product_id = chip->rtsx->pci->device;
        chip->adma_mode = 1;
        chip->lun_mc = 0;
        chip->driver_first_load = 1;
#ifdef HW_AUTO_SWITCH_SD_BUS
        chip->sdio_in_charge = 0;
#endif

        chip->mspro_formatter_enable = 1;
        chip->ignore_sd = 0;
        chip->use_hw_setting = 0;
        chip->lun_mode = DEFAULT_SINGLE;
        chip->auto_delink_en = auto_delink_en;
        chip->ss_en = ss_en;
        chip->ss_idle_period = ss_interval * 1000;
        chip->remote_wakeup_en = 0;
        chip->aspm_l0s_l1_en = aspm_l0s_l1_en;
        chip->dynamic_aspm = 1;
        chip->fpga_sd_sdr104_clk = CLK_200;
        chip->fpga_sd_ddr50_clk = CLK_100;
        chip->fpga_sd_sdr50_clk = CLK_100;
        chip->fpga_sd_hs_clk = CLK_100;
        chip->fpga_mmc_52m_clk = CLK_80;
        chip->fpga_ms_hg_clk = CLK_80;
        chip->fpga_ms_4bit_clk = CLK_80;
        chip->fpga_ms_1bit_clk = CLK_40;
        chip->asic_sd_sdr104_clk = 203;
        chip->asic_sd_sdr50_clk = 98;
        chip->asic_sd_ddr50_clk = 98;
        chip->asic_sd_hs_clk = 98;
        chip->asic_mmc_52m_clk = 98;
        chip->asic_ms_hg_clk = 117;
        chip->asic_ms_4bit_clk = 78;
        chip->asic_ms_1bit_clk = 39;
        chip->ssc_depth_sd_sdr104 = SSC_DEPTH_2M;
        chip->ssc_depth_sd_sdr50 = SSC_DEPTH_2M;
        chip->ssc_depth_sd_ddr50 = SSC_DEPTH_1M;
        chip->ssc_depth_sd_hs = SSC_DEPTH_1M;
        chip->ssc_depth_mmc_52m = SSC_DEPTH_1M;
        chip->ssc_depth_ms_hg = SSC_DEPTH_1M;
        chip->ssc_depth_ms_4bit = SSC_DEPTH_512K;
        chip->ssc_depth_low_speed = SSC_DEPTH_512K;
        chip->ssc_en = 1;
        chip->sd_speed_prior = 0x01040203;
        chip->sd_current_prior = 0x00010203;
        chip->sd_ctl = SD_PUSH_POINT_AUTO |
                       SD_SAMPLE_POINT_AUTO |
                       SUPPORT_MMC_DDR_MODE;
        chip->sd_ddr_tx_phase = 0;
        chip->mmc_ddr_tx_phase = 1;
        chip->sd_default_tx_phase = 15;
        chip->sd_default_rx_phase = 15;
        chip->pmos_pwr_on_interval = 200;
        chip->sd_voltage_switch_delay = 1000;
        chip->ms_power_class_en = 3;

        chip->sd_400mA_ocp_thd = 1;
        chip->sd_800mA_ocp_thd = 5;
        chip->ms_ocp_thd = 2;

        chip->card_drive_sel = 0x55;
        chip->sd30_drive_sel_1v8 = 0x03;
        chip->sd30_drive_sel_3v3 = 0x01;

        chip->do_delink_before_power_down = 1;
        chip->auto_power_down = 1;
        chip->polling_config = 0;

        chip->force_clkreq_0 = 1;
        chip->ft2_fast_mode = 0;

        chip->sdio_retry_cnt = 1;

        chip->xd_timeout = 2000;
        chip->sd_timeout = 10000;
        chip->ms_timeout = 2000;
        chip->mspro_timeout = 15000;

        chip->power_down_in_ss = 1;

        chip->sdr104_en = 1;
        chip->sdr50_en = 1;
        chip->ddr50_en = 1;

        chip->delink_stage1_step = 100;
        chip->delink_stage2_step = 40;
        chip->delink_stage3_step = 20;

        chip->auto_delink_in_L1 = 1;
        chip->blink_led = 1;
        chip->msi_en = msi_en;
        chip->hp_watch_bios_hotplug = 0;
        chip->max_payload = 0;
        chip->phy_voltage = 0;

        chip->support_ms_8bit = 1;
        chip->s3_pwr_off_delay = 1000;
}

static int rtsx_probe(struct pci_dev *pci,
                                const struct pci_device_id *pci_id)
{
        struct Scsi_Host *host;
        struct rtsx_dev *dev;
        int err = 0;
        struct task_struct *th;

        dev_dbg(&pci->dev, "Realtek PCI-E card reader detected\n");

        err = pcim_enable_device(pci);
        if (err < 0) {
                dev_err(&pci->dev, "PCI enable device failed!\n");
                return err;
        }

        err = pci_request_regions(pci, CR_DRIVER_NAME);
        if (err < 0) {
                dev_err(&pci->dev, "PCI request regions for %s failed!\n",
                        CR_DRIVER_NAME);
                return err;
        }

        /*
         * Ask the SCSI layer to allocate a host structure, with extra
         * space at the end for our private rtsx_dev structure.
         */
        host = scsi_host_alloc(&rtsx_host_template, sizeof(*dev));
        if (!host) {
                dev_err(&pci->dev, "Unable to allocate the scsi host\n");
                return -ENOMEM;
        }

        dev = host_to_rtsx(host);
        memset(dev, 0, sizeof(struct rtsx_dev));

        dev->chip = kzalloc(sizeof(struct rtsx_chip), GFP_KERNEL);
        if (!dev->chip) {
                err = -ENOMEM;
                goto errout;
        }

        spin_lock_init(&dev->reg_lock);
        mutex_init(&(dev->dev_mutex));
        init_completion(&dev->cmnd_ready);
        init_completion(&dev->control_exit);
        init_completion(&dev->polling_exit);
        init_completion(&(dev->notify));
        init_completion(&dev->scanning_done);
        init_waitqueue_head(&dev->delay_wait);

        dev->pci = pci;
        dev->irq = -1;

        dev_info(&pci->dev, "Resource length: 0x%x\n",
                 (unsigned int)pci_resource_len(pci, 0));
        dev->addr = pci_resource_start(pci, 0);
        dev->remap_addr = ioremap_nocache(dev->addr, pci_resource_len(pci, 0));
        if (!dev->remap_addr) {
                dev_err(&pci->dev, "ioremap error\n");
                err = -ENXIO;
                goto errout;
        }

        /*
         * Using "unsigned long" cast here to eliminate gcc warning in
         * 64-bit system
         */
        dev_info(&pci->dev, "Original address: 0x%lx, remapped address: 0x%lx\n",
                 (unsigned long)(dev->addr), (unsigned long)(dev->remap_addr));

        dev->rtsx_resv_buf = dmam_alloc_coherent(&pci->dev, RTSX_RESV_BUF_LEN,
                        &dev->rtsx_resv_buf_addr, GFP_KERNEL);
        if (!dev->rtsx_resv_buf) {
                dev_err(&pci->dev, "alloc dma buffer fail\n");
                err = -ENXIO;
                goto errout;
        }
        dev->chip->host_cmds_ptr = dev->rtsx_resv_buf;
        dev->chip->host_cmds_addr = dev->rtsx_resv_buf_addr;
        dev->chip->host_sg_tbl_ptr = dev->rtsx_resv_buf + HOST_CMDS_BUF_LEN;
        dev->chip->host_sg_tbl_addr = dev->rtsx_resv_buf_addr +
                                      HOST_CMDS_BUF_LEN;

        dev->chip->rtsx = dev;

        rtsx_init_options(dev->chip);

        dev_info(&pci->dev, "pci->irq = %d\n", pci->irq);

        if (dev->chip->msi_en) {
                if (pci_enable_msi(pci) < 0)
                        dev->chip->msi_en = 0;
        }

        if (rtsx_acquire_irq(dev) < 0) {
                err = -EBUSY;
                goto errout;
        }

        pci_set_master(pci);
        synchronize_irq(dev->irq);

        rtsx_init_chip(dev->chip);

        /*
         * set the supported max_lun and max_id for the scsi host
         * NOTE: the minimal value of max_id is 1
         */
        host->max_id = 1;
        host->max_lun = dev->chip->max_lun;

        /* Start up our control thread */
        th = kthread_run(rtsx_control_thread, dev, CR_DRIVER_NAME);
        if (IS_ERR(th)) {
                dev_err(&pci->dev, "Unable to start control thread\n");
                err = PTR_ERR(th);
                goto errout;
        }
        dev->ctl_thread = th;

        err = scsi_add_host(host, &pci->dev);
        if (err) {
                dev_err(&pci->dev, "Unable to add the scsi host\n");
                goto errout;
        }

        /* Start up the thread for delayed SCSI-device scanning */
        th = kthread_run(rtsx_scan_thread, dev, "rtsx-scan");
        if (IS_ERR(th)) {
                dev_err(&pci->dev, "Unable to start the device-scanning thread\n");
                complete(&dev->scanning_done);
                quiesce_and_remove_host(dev);
                err = PTR_ERR(th);
                goto errout;
        }

        /* Start up the thread for polling thread */
        th = kthread_run(rtsx_polling_thread, dev, "rtsx-polling");
        if (IS_ERR(th)) {
                dev_err(&pci->dev, "Unable to start the device-polling thread\n");
                quiesce_and_remove_host(dev);
                err = PTR_ERR(th);
                goto errout;
        }
        dev->polling_thread = th;

        pci_set_drvdata(pci, dev);

        return 0;

        /* We come here if there are any problems */
errout:
        dev_err(&pci->dev, "rtsx_probe() failed\n");
        release_everything(dev);

        return err;
}

static void rtsx_remove(struct pci_dev *pci)
{
        struct rtsx_dev *dev = pci_get_drvdata(pci);

        dev_info(&pci->dev, "rtsx_remove() called\n");

        quiesce_and_remove_host(dev);
        release_everything(dev);
}

/* PCI IDs */
static const struct pci_device_id rtsx_ids[] = {
        { PCI_DEVICE(PCI_VENDOR_ID_REALTEK, 0x5208),
                PCI_CLASS_OTHERS << 16, 0xFF0000 },
        { PCI_DEVICE(PCI_VENDOR_ID_REALTEK, 0x5288),
                PCI_CLASS_OTHERS << 16, 0xFF0000 },
        { 0, },
};

MODULE_DEVICE_TABLE(pci, rtsx_ids);

/* pci_driver definition */
static struct pci_driver rtsx_driver = {
        .name = CR_DRIVER_NAME,
        .id_table = rtsx_ids,
        .probe = rtsx_probe,
        .remove = rtsx_remove,
#ifdef CONFIG_PM
        .suspend = rtsx_suspend,
        .resume = rtsx_resume,
#endif
        .shutdown = rtsx_shutdown,
};

module_pci_driver(rtsx_driver);