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/*

 *    pata_jmicron.c - JMicron ATA driver for non AHCI mode. This drives the

 *                      PATA port of the controller. The SATA ports are

 *                      driven by AHCI in the usual configuration although

 *                      this driver can handle other setups if we need it.

 *

 *      (c) 2006 Red Hat  <alan@redhat.com>

 */

#include <linux/kernel.h>

#include <linux/module.h>

#include <linux/pci.h>

#include <linux/init.h>

#include <linux/blkdev.h>

#include <linux/delay.h>

#include <linux/device.h>

#include <scsi/scsi_host.h>

#include <linux/libata.h>

#include <linux/ata.h>

#define DRV_NAME        "pata_jmicron"

#define DRV_VERSION     "0.1.5"

typedef enum {

        PORT_PATA0 = 0,

        PORT_PATA1 = 1,

        PORT_SATA = 2,

} port_type;

/**

 *      jmicron_pre_reset       -       check for 40/80 pin

 *      @link: ATA link

 *      @deadline: deadline jiffies for the operation

 *

 *      Perform the PATA port setup we need.

 *

 *      On the Jmicron 361/363 there is a single PATA port that can be mapped

 *      either as primary or secondary (or neither). We don't do any policy

 *      and setup here. We assume that has been done by init_one and the

 *      BIOS.

 */

static int jmicron_pre_reset(struct ata_link *link, unsigned long deadline)

{

        struct ata_port *ap = link->ap;

        struct pci_dev *pdev = to_pci_dev(ap->host->dev);

        u32 control;

        u32 control5;

        int port_mask = 1<< (4 * ap->port_no);

        int port = ap->port_no;

        port_type port_map[2];

        /* Check if our port is enabled */

        pci_read_config_dword(pdev, 0x40, &control);

        if ((control & port_mask) == 0)

                return -ENOENT;

        /* There are two basic mappings. One has the two SATA ports merged

           as master/slave and the secondary as PATA, the other has only the

           SATA port mapped */

        if (control & (1 << 23)) {

                port_map[0] = PORT_SATA;

                port_map[1] = PORT_PATA0;

        } else {

                port_map[0] = PORT_SATA;

                port_map[1] = PORT_SATA;

        }

        /* The 365/366 may have this bit set to map the second PATA port

           as the internal primary channel */

        pci_read_config_dword(pdev, 0x80, &control5);

        if (control5 & (1<<24))

                port_map[0] = PORT_PATA1;

        /* The two ports may then be logically swapped by the firmware */

        if (control & (1 << 22))

                port = port ^ 1;

        /*

         *      Now we know which physical port we are talking about we can

         *      actually do our cable checking etc. Thankfully we don't need

         *      to do the plumbing for other cases.

         */

        switch (port_map[port]) {

        case PORT_PATA0:

                if ((control & (1 << 5)) == 0)

                        return -ENOENT;

                if (control & (1 << 3)) /* 40/80 pin primary */

                        ap->cbl = ATA_CBL_PATA40;

                else

                        ap->cbl = ATA_CBL_PATA80;

                break;

        case PORT_PATA1:

                /* Bit 21 is set if the port is enabled */

                if ((control5 & (1 << 21)) == 0)

                        return -ENOENT;

                if (control5 & (1 << 19))       /* 40/80 pin secondary */

                        ap->cbl = ATA_CBL_PATA40;

                else

                        ap->cbl = ATA_CBL_PATA80;

                break;

        case PORT_SATA:

                ap->cbl = ATA_CBL_SATA;

                break;

        }

        return ata_std_prereset(link, deadline);

}

/**

 *      jmicron_error_handler - Setup and error handler

 *      @ap: Port to handle

 *

 *      LOCKING:

 *      None (inherited from caller).

 */

static void jmicron_error_handler(struct ata_port *ap)

{

        return ata_bmdma_drive_eh(ap, jmicron_pre_reset, ata_std_softreset, NULL, ata_std_postreset);

}

/* No PIO or DMA methods needed for this device */

static struct scsi_host_template jmicron_sht = {

        .module                 = THIS_MODULE,

        .name                   = DRV_NAME,

        .ioctl                  = ata_scsi_ioctl,

        .queuecommand           = ata_scsi_queuecmd,

        .can_queue              = ATA_DEF_QUEUE,

        .this_id                = ATA_SHT_THIS_ID,

        .sg_tablesize           = LIBATA_MAX_PRD,

        .cmd_per_lun            = ATA_SHT_CMD_PER_LUN,

        .emulated               = ATA_SHT_EMULATED,

        .use_clustering         = ATA_SHT_USE_CLUSTERING,

        .proc_name              = DRV_NAME,

        .dma_boundary           = ATA_DMA_BOUNDARY,

        .slave_configure        = ata_scsi_slave_config,

        .slave_destroy          = ata_scsi_slave_destroy,

        /* Use standard CHS mapping rules */

        .bios_param             = ata_std_bios_param,

};

static const struct ata_port_operations jmicron_ops = {

        /* Task file is PCI ATA format, use helpers */

        .tf_load                = ata_tf_load,

        .tf_read                = ata_tf_read,

        .check_status           = ata_check_status,

        .exec_command           = ata_exec_command,

        .dev_select             = ata_std_dev_select,

        .freeze                 = ata_bmdma_freeze,

        .thaw                   = ata_bmdma_thaw,

        .error_handler          = jmicron_error_handler,

        .post_internal_cmd      = ata_bmdma_post_internal_cmd,

        /* BMDMA handling is PCI ATA format, use helpers */

        .bmdma_setup            = ata_bmdma_setup,

        .bmdma_start            = ata_bmdma_start,

        .bmdma_stop             = ata_bmdma_stop,

        .bmdma_status           = ata_bmdma_status,

        .qc_prep                = ata_qc_prep,

        .qc_issue               = ata_qc_issue_prot,

        .data_xfer              = ata_data_xfer,

        /* IRQ-related hooks */

        .irq_handler            = ata_interrupt,

        .irq_clear              = ata_bmdma_irq_clear,

        .irq_on                 = ata_irq_on,

        /* Generic PATA PCI ATA helpers */

        .port_start             = ata_port_start,

};

/**

 *      jmicron_init_one - Register Jmicron ATA PCI device with kernel services

 *      @pdev: PCI device to register

 *      @ent: Entry in jmicron_pci_tbl matching with @pdev

 *

 *      Called from kernel PCI layer.

 *

 *      LOCKING:

 *      Inherited from PCI layer (may sleep).

 *

 *      RETURNS:

 *      Zero on success, or -ERRNO value.

 */

static int jmicron_init_one (struct pci_dev *pdev, const struct pci_device_id *id)

{

        static const struct ata_port_info info = {

                .sht            = &jmicron_sht,

                .flags  = ATA_FLAG_SLAVE_POSS,

                .pio_mask       = 0x1f,

                .mwdma_mask     = 0x07,

                .udma_mask      = ATA_UDMA5,

                .port_ops       = &jmicron_ops,

        };

        const struct ata_port_info *ppi[] = { &info, NULL };

        return ata_pci_init_one(pdev, ppi);

}

static const struct pci_device_id jmicron_pci_tbl[] = {

        { PCI_VENDOR_ID_JMICRON, PCI_ANY_ID, PCI_ANY_ID, PCI_ANY_ID,

          PCI_CLASS_STORAGE_IDE << 8, 0xffff00, 0 },

        { }     /* terminate list */

};

static struct pci_driver jmicron_pci_driver = {

        .name                   = DRV_NAME,

        .id_table               = jmicron_pci_tbl,

        .probe                  = jmicron_init_one,

        .remove                 = ata_pci_remove_one,

#ifdef CONFIG_PM

        .suspend                = ata_pci_device_suspend,

        .resume                 = ata_pci_device_resume,

#endif

};

static int __init jmicron_init(void)

{

        return pci_register_driver(&jmicron_pci_driver);

}

static void __exit jmicron_exit(void)

{

        pci_unregister_driver(&jmicron_pci_driver);

}

module_init(jmicron_init);

module_exit(jmicron_exit);

MODULE_AUTHOR("Alan Cox");

MODULE_DESCRIPTION("SCSI low-level driver for Jmicron PATA ports");

MODULE_LICENSE("GPL");

MODULE_DEVICE_TABLE(pci, jmicron_pci_tbl);

MODULE_VERSION(DRV_VERSION);