Merge ../bleed-2.6

1 files changed, 875 insertions, 0 deletions

diff --git a/drivers/scsi/sata_sil24.c b/drivers/scsi/sata_sil24.c
new file mode 100644
index 000000000000..32d730bd5bb6
--- /dev/null
+++ b/drivers/scsi/sata_sil24.c
@@ -0,0 +1,875 @@
+/*
+ * sata_sil24.c - Driver for Silicon Image 3124/3132 SATA-2 controllers
+ *
+ * Copyright 2005  Tejun Heo
+ *
+ * Based on preview driver from Silicon Image.
+ *
+ * NOTE: No NCQ/ATAPI support yet.  The preview driver didn't support
+ * NCQ nor ATAPI, and, unfortunately, I couldn't find out how to make
+ * those work.  Enabling those shouldn't be difficult.  Basic
+ * structure is all there (in libata-dev tree).  If you have any
+ * information about this hardware, please contact me or linux-ide.
+ * Info is needed on...
+ *
+ * - How to issue tagged commands and turn on sactive on issue accordingly.
+ * - Where to put an ATAPI command and how to tell the device to send it.
+ * - How to enable/use 64bit.
+ *
+ * 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.
+ *
+ */
+
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/pci.h>
+#include <linux/blkdev.h>
+#include <linux/delay.h>
+#include <linux/interrupt.h>
+#include <linux/dma-mapping.h>
+#include <scsi/scsi_host.h>
+#include "scsi.h"
+#include <linux/libata.h>
+#include <asm/io.h>
+
+#define DRV_NAME        "sata_sil24"
+#define DRV_VERSION     "0.22"  /* Silicon Image's preview driver was 0.10 */
+
+/*
+ * Port request block (PRB) 32 bytes
+ */
+struct sil24_prb {
+        u16     ctrl;
+        u16     prot;
+        u32     rx_cnt;
+        u8      fis[6 * 4];
+};
+
+/*
+ * Scatter gather entry (SGE) 16 bytes
+ */
+struct sil24_sge {
+        u64     addr;
+        u32     cnt;
+        u32     flags;
+};
+
+/*
+ * Port multiplier
+ */
+struct sil24_port_multiplier {
+        u32     diag;
+        u32     sactive;
+};
+
+enum {
+        /*
+         * Global controller registers (128 bytes @ BAR0)
+         */
+                /* 32 bit regs */
+        HOST_SLOT_STAT          = 0x00, /* 32 bit slot stat * 4 */
+        HOST_CTRL               = 0x40,
+        HOST_IRQ_STAT           = 0x44,
+        HOST_PHY_CFG            = 0x48,
+        HOST_BIST_CTRL          = 0x50,
+        HOST_BIST_PTRN          = 0x54,
+        HOST_BIST_STAT          = 0x58,
+        HOST_MEM_BIST_STAT      = 0x5c,
+        HOST_FLASH_CMD          = 0x70,
+                /* 8 bit regs */
+        HOST_FLASH_DATA         = 0x74,
+        HOST_TRANSITION_DETECT  = 0x75,
+        HOST_GPIO_CTRL          = 0x76,
+        HOST_I2C_ADDR           = 0x78, /* 32 bit */
+        HOST_I2C_DATA           = 0x7c,
+        HOST_I2C_XFER_CNT       = 0x7e,
+        HOST_I2C_CTRL           = 0x7f,
+
+        /* HOST_SLOT_STAT bits */
+        HOST_SSTAT_ATTN         = (1 << 31),
+
+        /*
+         * Port registers
+         * (8192 bytes @ +0x0000, +0x2000, +0x4000 and +0x6000 @ BAR2)
+         */
+        PORT_REGS_SIZE          = 0x2000,
+        PORT_PRB                = 0x0000, /* (32 bytes PRB + 16 bytes SGEs * 6) * 31 (3968 bytes) */
+
+        PORT_PM                 = 0x0f80, /* 8 bytes PM * 16 (128 bytes) */
+                /* 32 bit regs */
+        PORT_CTRL_STAT          = 0x1000, /* write: ctrl-set, read: stat */
+        PORT_CTRL_CLR           = 0x1004, /* write: ctrl-clear */
+        PORT_IRQ_STAT           = 0x1008, /* high: status, low: interrupt */
+        PORT_IRQ_ENABLE_SET     = 0x1010, /* write: enable-set */
+        PORT_IRQ_ENABLE_CLR     = 0x1014, /* write: enable-clear */
+        PORT_ACTIVATE_UPPER_ADDR= 0x101c,
+        PORT_EXEC_FIFO          = 0x1020, /* command execution fifo */
+        PORT_CMD_ERR            = 0x1024, /* command error number */
+        PORT_FIS_CFG            = 0x1028,
+        PORT_FIFO_THRES         = 0x102c,
+                /* 16 bit regs */
+        PORT_DECODE_ERR_CNT     = 0x1040,
+        PORT_DECODE_ERR_THRESH  = 0x1042,
+        PORT_CRC_ERR_CNT        = 0x1044,
+        PORT_CRC_ERR_THRESH     = 0x1046,
+        PORT_HSHK_ERR_CNT       = 0x1048,
+        PORT_HSHK_ERR_THRESH    = 0x104a,
+                /* 32 bit regs */
+        PORT_PHY_CFG            = 0x1050,
+        PORT_SLOT_STAT          = 0x1800,
+        PORT_CMD_ACTIVATE       = 0x1c00, /* 64 bit cmd activate * 31 (248 bytes) */
+        PORT_EXEC_DIAG          = 0x1e00, /* 32bit exec diag * 16 (64 bytes, 0-10 used on 3124) */
+        PORT_PSD_DIAG           = 0x1e40, /* 32bit psd diag * 16 (64 bytes, 0-8 used on 3124) */
+        PORT_SCONTROL           = 0x1f00,
+        PORT_SSTATUS            = 0x1f04,
+        PORT_SERROR             = 0x1f08,
+        PORT_SACTIVE            = 0x1f0c,
+
+        /* PORT_CTRL_STAT bits */
+        PORT_CS_PORT_RST        = (1 << 0), /* port reset */
+        PORT_CS_DEV_RST         = (1 << 1), /* device reset */
+        PORT_CS_INIT            = (1 << 2), /* port initialize */
+        PORT_CS_IRQ_WOC         = (1 << 3), /* interrupt write one to clear */
+        PORT_CS_RESUME          = (1 << 6), /* port resume */
+        PORT_CS_32BIT_ACTV      = (1 << 10), /* 32-bit activation */
+        PORT_CS_PM_EN           = (1 << 13), /* port multiplier enable */
+        PORT_CS_RDY             = (1 << 31), /* port ready to accept commands */
+
+        /* PORT_IRQ_STAT/ENABLE_SET/CLR */
+        /* bits[11:0] are masked */
+        PORT_IRQ_COMPLETE       = (1 << 0), /* command(s) completed */
+        PORT_IRQ_ERROR          = (1 << 1), /* command execution error */
+        PORT_IRQ_PORTRDY_CHG    = (1 << 2), /* port ready change */
+        PORT_IRQ_PWR_CHG        = (1 << 3), /* power management change */
+        PORT_IRQ_PHYRDY_CHG     = (1 << 4), /* PHY ready change */
+        PORT_IRQ_COMWAKE        = (1 << 5), /* COMWAKE received */
+        PORT_IRQ_UNK_FIS        = (1 << 6), /* Unknown FIS received */
+        PORT_IRQ_SDB_FIS        = (1 << 11), /* SDB FIS received */
+
+        /* bits[27:16] are unmasked (raw) */
+        PORT_IRQ_RAW_SHIFT      = 16,
+        PORT_IRQ_MASKED_MASK    = 0x7ff,
+        PORT_IRQ_RAW_MASK       = (0x7ff << PORT_IRQ_RAW_SHIFT),
+
+        /* ENABLE_SET/CLR specific, intr steering - 2 bit field */
+        PORT_IRQ_STEER_SHIFT    = 30,
+        PORT_IRQ_STEER_MASK     = (3 << PORT_IRQ_STEER_SHIFT),
+
+        /* PORT_CMD_ERR constants */
+        PORT_CERR_DEV           = 1, /* Error bit in D2H Register FIS */
+        PORT_CERR_SDB           = 2, /* Error bit in SDB FIS */
+        PORT_CERR_DATA          = 3, /* Error in data FIS not detected by dev */
+        PORT_CERR_SEND          = 4, /* Initial cmd FIS transmission failure */
+        PORT_CERR_INCONSISTENT  = 5, /* Protocol mismatch */
+        PORT_CERR_DIRECTION     = 6, /* Data direction mismatch */
+        PORT_CERR_UNDERRUN      = 7, /* Ran out of SGEs while writing */
+        PORT_CERR_OVERRUN       = 8, /* Ran out of SGEs while reading */
+        PORT_CERR_PKT_PROT      = 11, /* DIR invalid in 1st PIO setup of ATAPI */
+        PORT_CERR_SGT_BOUNDARY  = 16, /* PLD ecode 00 - SGT not on qword boundary */
+        PORT_CERR_SGT_TGTABRT   = 17, /* PLD ecode 01 - target abort */
+        PORT_CERR_SGT_MSTABRT   = 18, /* PLD ecode 10 - master abort */
+        PORT_CERR_SGT_PCIPERR   = 19, /* PLD ecode 11 - PCI parity err while fetching SGT */
+        PORT_CERR_CMD_BOUNDARY  = 24, /* ctrl[15:13] 001 - PRB not on qword boundary */
+        PORT_CERR_CMD_TGTABRT   = 25, /* ctrl[15:13] 010 - target abort */
+        PORT_CERR_CMD_MSTABRT   = 26, /* ctrl[15:13] 100 - master abort */
+        PORT_CERR_CMD_PCIPERR   = 27, /* ctrl[15:13] 110 - PCI parity err while fetching PRB */
+        PORT_CERR_XFR_UNDEF     = 32, /* PSD ecode 00 - undefined */
+        PORT_CERR_XFR_TGTABRT   = 33, /* PSD ecode 01 - target abort */
+        PORT_CERR_XFR_MSGABRT   = 34, /* PSD ecode 10 - master abort */
+        PORT_CERR_XFR_PCIPERR   = 35, /* PSD ecode 11 - PCI prity err during transfer */
+        PORT_CERR_SENDSERVICE   = 36, /* FIS received while sending service */
+
+        /*
+         * Other constants
+         */
+        SGE_TRM                 = (1 << 31), /* Last SGE in chain */
+        PRB_SOFT_RST            = (1 << 7),  /* Soft reset request (ign BSY?) */
+
+        /* board id */
+        BID_SIL3124             = 0,
+        BID_SIL3132             = 1,
+        BID_SIL3131             = 2,
+
+        IRQ_STAT_4PORTS         = 0xf,
+};
+
+struct sil24_cmd_block {
+        struct sil24_prb prb;
+        struct sil24_sge sge[LIBATA_MAX_PRD];
+};
+
+/*
+ * ap->private_data
+ *
+ * The preview driver always returned 0 for status.  We emulate it
+ * here from the previous interrupt.
+ */
+struct sil24_port_priv {
+        struct sil24_cmd_block *cmd_block;      /* 32 cmd blocks */
+        dma_addr_t cmd_block_dma;               /* DMA base addr for them */
+        struct ata_taskfile tf;                 /* Cached taskfile registers */
+};
+
+/* ap->host_set->private_data */
+struct sil24_host_priv {
+        void *host_base;        /* global controller control (128 bytes @BAR0) */
+        void *port_base;        /* port registers (4 * 8192 bytes @BAR2) */
+};
+
+static u8 sil24_check_status(struct ata_port *ap);
+static u8 sil24_check_err(struct ata_port *ap);
+static u32 sil24_scr_read(struct ata_port *ap, unsigned sc_reg);
+static void sil24_scr_write(struct ata_port *ap, unsigned sc_reg, u32 val);
+static void sil24_tf_read(struct ata_port *ap, struct ata_taskfile *tf);
+static void sil24_phy_reset(struct ata_port *ap);
+static void sil24_qc_prep(struct ata_queued_cmd *qc);
+static int sil24_qc_issue(struct ata_queued_cmd *qc);
+static void sil24_irq_clear(struct ata_port *ap);
+static void sil24_eng_timeout(struct ata_port *ap);
+static irqreturn_t sil24_interrupt(int irq, void *dev_instance, struct pt_regs *regs);
+static int sil24_port_start(struct ata_port *ap);
+static void sil24_port_stop(struct ata_port *ap);
+static void sil24_host_stop(struct ata_host_set *host_set);
+static int sil24_init_one(struct pci_dev *pdev, const struct pci_device_id *ent);
+
+static struct pci_device_id sil24_pci_tbl[] = {
+        { 0x1095, 0x3124, PCI_ANY_ID, PCI_ANY_ID, 0, 0, BID_SIL3124 },
+        { 0x1095, 0x3132, PCI_ANY_ID, PCI_ANY_ID, 0, 0, BID_SIL3132 },
+        { 0x1095, 0x3131, PCI_ANY_ID, PCI_ANY_ID, 0, 0, BID_SIL3131 },
+        { 0x1095, 0x3531, PCI_ANY_ID, PCI_ANY_ID, 0, 0, BID_SIL3131 },
+        { } /* terminate list */
+};
+
+static struct pci_driver sil24_pci_driver = {
+        .name                   = DRV_NAME,
+        .id_table               = sil24_pci_tbl,
+        .probe                  = sil24_init_one,
+        .remove                 = ata_pci_remove_one, /* safe? */
+};
+
+static Scsi_Host_Template sil24_sht = {
+        .module                 = THIS_MODULE,
+        .name                   = DRV_NAME,
+        .ioctl                  = ata_scsi_ioctl,
+        .queuecommand           = ata_scsi_queuecmd,
+        .eh_strategy_handler    = ata_scsi_error,
+        .can_queue              = ATA_DEF_QUEUE,
+        .this_id                = ATA_SHT_THIS_ID,
+        .sg_tablesize           = LIBATA_MAX_PRD,
+        .max_sectors            = ATA_MAX_SECTORS,
+        .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,
+        .bios_param             = ata_std_bios_param,
+        .ordered_flush          = 1, /* NCQ not supported yet */
+};
+
+static const struct ata_port_operations sil24_ops = {
+        .port_disable           = ata_port_disable,
+
+        .check_status           = sil24_check_status,
+        .check_altstatus        = sil24_check_status,
+        .check_err              = sil24_check_err,
+        .dev_select             = ata_noop_dev_select,
+
+        .tf_read                = sil24_tf_read,
+
+        .phy_reset              = sil24_phy_reset,
+
+        .qc_prep                = sil24_qc_prep,
+        .qc_issue               = sil24_qc_issue,
+
+        .eng_timeout            = sil24_eng_timeout,
+
+        .irq_handler            = sil24_interrupt,
+        .irq_clear              = sil24_irq_clear,
+
+        .scr_read               = sil24_scr_read,
+        .scr_write              = sil24_scr_write,
+
+        .port_start             = sil24_port_start,
+        .port_stop              = sil24_port_stop,
+        .host_stop              = sil24_host_stop,
+};
+
+/*
+ * Use bits 30-31 of host_flags to encode available port numbers.
+ * Current maxium is 4.
+ */
+#define SIL24_NPORTS2FLAG(nports)       ((((unsigned)(nports) - 1) & 0x3) << 30)
+#define SIL24_FLAG2NPORTS(flag)         ((((flag) >> 30) & 0x3) + 1)
+
+static struct ata_port_info sil24_port_info[] = {
+        /* sil_3124 */
+        {
+                .sht            = &sil24_sht,
+                .host_flags     = ATA_FLAG_SATA | ATA_FLAG_NO_LEGACY |
+                                  ATA_FLAG_SATA_RESET | ATA_FLAG_MMIO |
+                                  ATA_FLAG_PIO_DMA | SIL24_NPORTS2FLAG(4),
+                .pio_mask       = 0x1f,                 /* pio0-4 */
+                .mwdma_mask     = 0x07,                 /* mwdma0-2 */
+                .udma_mask      = 0x3f,                 /* udma0-5 */
+                .port_ops       = &sil24_ops,
+        },
+        /* sil_3132 */ 
+        {
+                .sht            = &sil24_sht,
+                .host_flags     = ATA_FLAG_SATA | ATA_FLAG_NO_LEGACY |
+                                  ATA_FLAG_SATA_RESET | ATA_FLAG_MMIO |
+                                  ATA_FLAG_PIO_DMA | SIL24_NPORTS2FLAG(2),
+                .pio_mask       = 0x1f,                 /* pio0-4 */
+                .mwdma_mask     = 0x07,                 /* mwdma0-2 */
+                .udma_mask      = 0x3f,                 /* udma0-5 */
+                .port_ops       = &sil24_ops,
+        },
+        /* sil_3131/sil_3531 */
+        {
+                .sht            = &sil24_sht,
+                .host_flags     = ATA_FLAG_SATA | ATA_FLAG_NO_LEGACY |
+                                  ATA_FLAG_SATA_RESET | ATA_FLAG_MMIO |
+                                  ATA_FLAG_PIO_DMA | SIL24_NPORTS2FLAG(1),
+                .pio_mask       = 0x1f,                 /* pio0-4 */
+                .mwdma_mask     = 0x07,                 /* mwdma0-2 */
+                .udma_mask      = 0x3f,                 /* udma0-5 */
+                .port_ops       = &sil24_ops,
+        },
+};
+
+static inline void sil24_update_tf(struct ata_port *ap)
+{
+        struct sil24_port_priv *pp = ap->private_data;
+        void *port = (void *)ap->ioaddr.cmd_addr;
+        struct sil24_prb *prb = port;
+
+        ata_tf_from_fis(prb->fis, &pp->tf);
+}
+
+static u8 sil24_check_status(struct ata_port *ap)
+{
+        struct sil24_port_priv *pp = ap->private_data;
+        return pp->tf.command;
+}
+
+static u8 sil24_check_err(struct ata_port *ap)
+{
+        struct sil24_port_priv *pp = ap->private_data;
+        return pp->tf.feature;
+}
+
+static int sil24_scr_map[] = {
+        [SCR_CONTROL]   = 0,
+        [SCR_STATUS]    = 1,
+        [SCR_ERROR]     = 2,
+        [SCR_ACTIVE]    = 3,
+};
+
+static u32 sil24_scr_read(struct ata_port *ap, unsigned sc_reg)
+{
+        void *scr_addr = (void *)ap->ioaddr.scr_addr;
+        if (sc_reg < ARRAY_SIZE(sil24_scr_map)) {
+                void *addr;
+                addr = scr_addr + sil24_scr_map[sc_reg] * 4;
+                return readl(scr_addr + sil24_scr_map[sc_reg] * 4);
+        }
+        return 0xffffffffU;
+}
+
+static void sil24_scr_write(struct ata_port *ap, unsigned sc_reg, u32 val)
+{
+        void *scr_addr = (void *)ap->ioaddr.scr_addr;
+        if (sc_reg < ARRAY_SIZE(sil24_scr_map)) {
+                void *addr;
+                addr = scr_addr + sil24_scr_map[sc_reg] * 4;
+                writel(val, scr_addr + sil24_scr_map[sc_reg] * 4);
+        }
+}
+
+static void sil24_tf_read(struct ata_port *ap, struct ata_taskfile *tf)
+{
+        struct sil24_port_priv *pp = ap->private_data;
+        *tf = pp->tf;
+}
+
+static void sil24_phy_reset(struct ata_port *ap)
+{
+        __sata_phy_reset(ap);
+        /*
+         * No ATAPI yet.  Just unconditionally indicate ATA device.
+         * If ATAPI device is attached, it will fail ATA_CMD_ID_ATA
+         * and libata core will ignore the device.
+         */
+        if (!(ap->flags & ATA_FLAG_PORT_DISABLED))
+                ap->device[0].class = ATA_DEV_ATA;
+}
+
+static inline void sil24_fill_sg(struct ata_queued_cmd *qc,
+                                 struct sil24_cmd_block *cb)
+{
+        struct scatterlist *sg = qc->sg;
+        struct sil24_sge *sge = cb->sge;
+        unsigned i;
+
+        for (i = 0; i < qc->n_elem; i++, sg++, sge++) {
+                sge->addr = cpu_to_le64(sg_dma_address(sg));
+                sge->cnt = cpu_to_le32(sg_dma_len(sg));
+                sge->flags = 0;
+                sge->flags = i < qc->n_elem - 1 ? 0 : cpu_to_le32(SGE_TRM);
+        }
+}
+
+static void sil24_qc_prep(struct ata_queued_cmd *qc)
+{
+        struct ata_port *ap = qc->ap;
+        struct sil24_port_priv *pp = ap->private_data;
+        struct sil24_cmd_block *cb = pp->cmd_block + qc->tag;
+        struct sil24_prb *prb = &cb->prb;
+
+        switch (qc->tf.protocol) {
+        case ATA_PROT_PIO:
+        case ATA_PROT_DMA:
+        case ATA_PROT_NODATA:
+                break;
+        default:
+                /* ATAPI isn't supported yet */
+                BUG();
+        }
+
+        ata_tf_to_fis(&qc->tf, prb->fis, 0);
+
+        if (qc->flags & ATA_QCFLAG_DMAMAP)
+                sil24_fill_sg(qc, cb);
+}
+
+static int sil24_qc_issue(struct ata_queued_cmd *qc)
+{
+        struct ata_port *ap = qc->ap;
+        void *port = (void *)ap->ioaddr.cmd_addr;
+        struct sil24_port_priv *pp = ap->private_data;
+        dma_addr_t paddr = pp->cmd_block_dma + qc->tag * sizeof(*pp->cmd_block);
+
+        writel((u32)paddr, port + PORT_CMD_ACTIVATE);
+        return 0;
+}
+
+static void sil24_irq_clear(struct ata_port *ap)
+{
+        /* unused */
+}
+
+static int __sil24_reset_controller(void *port)
+{
+        int cnt;
+        u32 tmp;
+
+        /* Reset controller state.  Is this correct? */
+        writel(PORT_CS_DEV_RST, port + PORT_CTRL_STAT);
+        readl(port + PORT_CTRL_STAT);   /* sync */
+
+        /* Max ~100ms */
+        for (cnt = 0; cnt < 1000; cnt++) {
+                udelay(100);
+                tmp = readl(port + PORT_CTRL_STAT);
+                if (!(tmp & PORT_CS_DEV_RST))
+                        break;
+        }
+
+        if (tmp & PORT_CS_DEV_RST)
+                return -1;
+        return 0;
+}
+
+static void sil24_reset_controller(struct ata_port *ap)
+{
+        printk(KERN_NOTICE DRV_NAME
+               " ata%u: resetting controller...\n", ap->id);
+        if (__sil24_reset_controller((void *)ap->ioaddr.cmd_addr))
+                printk(KERN_ERR DRV_NAME
+                       " ata%u: failed to reset controller\n", ap->id);
+}
+
+static void sil24_eng_timeout(struct ata_port *ap)
+{
+        struct ata_queued_cmd *qc;
+
+        qc = ata_qc_from_tag(ap, ap->active_tag);
+        if (!qc) {
+                printk(KERN_ERR "ata%u: BUG: tiemout without command\n",
+                       ap->id);
+                return;
+        }
+
+        /*
+         * hack alert!  We cannot use the supplied completion
+         * function from inside the ->eh_strategy_handler() thread.
+         * libata is the only user of ->eh_strategy_handler() in
+         * any kernel, so the default scsi_done() assumes it is
+         * not being called from the SCSI EH.
+         */
+        printk(KERN_ERR "ata%u: command timeout\n", ap->id);
+        qc->scsidone = scsi_finish_command;
+        ata_qc_complete(qc, ATA_ERR);
+
+        sil24_reset_controller(ap);
+}
+
+static void sil24_error_intr(struct ata_port *ap, u32 slot_stat)
+{
+        struct ata_queued_cmd *qc = ata_qc_from_tag(ap, ap->active_tag);
+        struct sil24_port_priv *pp = ap->private_data;
+        void *port = (void *)ap->ioaddr.cmd_addr;
+        u32 irq_stat, cmd_err, sstatus, serror;
+
+        irq_stat = readl(port + PORT_IRQ_STAT);
+        writel(irq_stat, port + PORT_IRQ_STAT);         /* clear irq */
+
+        if (!(irq_stat & PORT_IRQ_ERROR)) {
+                /* ignore non-completion, non-error irqs for now */
+                printk(KERN_WARNING DRV_NAME
+                       "ata%u: non-error exception irq (irq_stat %x)\n",
+                       ap->id, irq_stat);
+                return;
+        }
+
+        cmd_err = readl(port + PORT_CMD_ERR);
+        sstatus = readl(port + PORT_SSTATUS);
+        serror = readl(port + PORT_SERROR);
+        if (serror)
+                writel(serror, port + PORT_SERROR);
+
+        printk(KERN_ERR DRV_NAME " ata%u: error interrupt on port%d\n"
+               "  stat=0x%x irq=0x%x cmd_err=%d sstatus=0x%x serror=0x%x\n",
+               ap->id, ap->port_no, slot_stat, irq_stat, cmd_err, sstatus, serror);
+
+        if (cmd_err == PORT_CERR_DEV || cmd_err == PORT_CERR_SDB) {
+                /*
+                 * Device is reporting error, tf registers are valid.
+                 */
+                sil24_update_tf(ap);
+        } else {
+                /*
+                 * Other errors.  libata currently doesn't have any
+                 * mechanism to report these errors.  Just turn on
+                 * ATA_ERR.
+                 */
+                pp->tf.command = ATA_ERR;
+        }
+
+        if (qc)
+                ata_qc_complete(qc, pp->tf.command);
+
+        sil24_reset_controller(ap);
+}
+
+static inline void sil24_host_intr(struct ata_port *ap)
+{
+        struct ata_queued_cmd *qc = ata_qc_from_tag(ap, ap->active_tag);
+        void *port = (void *)ap->ioaddr.cmd_addr;
+        u32 slot_stat;
+
+        slot_stat = readl(port + PORT_SLOT_STAT);
+        if (!(slot_stat & HOST_SSTAT_ATTN)) {
+                struct sil24_port_priv *pp = ap->private_data;
+                /*
+                 * !HOST_SSAT_ATTN guarantees successful completion,
+                 * so reading back tf registers is unnecessary for
+                 * most commands.  TODO: read tf registers for
+                 * commands which require these values on successful
+                 * completion (EXECUTE DEVICE DIAGNOSTIC, CHECK POWER,
+                 * DEVICE RESET and READ PORT MULTIPLIER (any more?).
+                 */
+                sil24_update_tf(ap);
+
+                if (qc)
+                        ata_qc_complete(qc, pp->tf.command);
+        } else
+                sil24_error_intr(ap, slot_stat);
+}
+
+static irqreturn_t sil24_interrupt(int irq, void *dev_instance, struct pt_regs *regs)
+{
+        struct ata_host_set *host_set = dev_instance;
+        struct sil24_host_priv *hpriv = host_set->private_data;
+        unsigned handled = 0;
+        u32 status;
+        int i;
+
+        status = readl(hpriv->host_base + HOST_IRQ_STAT);
+
+        if (status == 0xffffffff) {
+                printk(KERN_ERR DRV_NAME ": IRQ status == 0xffffffff, "
+                       "PCI fault or device removal?\n");
+                goto out;
+        }
+
+        if (!(status & IRQ_STAT_4PORTS))
+                goto out;
+
+        spin_lock(&host_set->lock);
+
+        for (i = 0; i < host_set->n_ports; i++)
+                if (status & (1 << i)) {
+                        struct ata_port *ap = host_set->ports[i];
+                        if (ap && !(ap->flags & ATA_FLAG_PORT_DISABLED)) {
+                                sil24_host_intr(host_set->ports[i]);
+                                handled++;
+                        } else
+                                printk(KERN_ERR DRV_NAME
+                                       ": interrupt from disabled port %d\n", i);
+                }
+
+        spin_unlock(&host_set->lock);
+ out:
+        return IRQ_RETVAL(handled);
+}
+
+static int sil24_port_start(struct ata_port *ap)
+{
+        struct device *dev = ap->host_set->dev;
+        struct sil24_port_priv *pp;
+        struct sil24_cmd_block *cb;
+        size_t cb_size = sizeof(*cb);
+        dma_addr_t cb_dma;
+
+        pp = kmalloc(sizeof(*pp), GFP_KERNEL);
+        if (!pp)
+                return -ENOMEM;
+        memset(pp, 0, sizeof(*pp));
+
+        pp->tf.command = ATA_DRDY;
+
+        cb = dma_alloc_coherent(dev, cb_size, &cb_dma, GFP_KERNEL);
+        if (!cb) {
+                kfree(pp);
+                return -ENOMEM;
+        }
+        memset(cb, 0, cb_size);
+
+        pp->cmd_block = cb;
+        pp->cmd_block_dma = cb_dma;
+
+        ap->private_data = pp;
+
+        return 0;
+}
+
+static void sil24_port_stop(struct ata_port *ap)
+{
+        struct device *dev = ap->host_set->dev;
+        struct sil24_port_priv *pp = ap->private_data;
+        size_t cb_size = sizeof(*pp->cmd_block);
+
+        dma_free_coherent(dev, cb_size, pp->cmd_block, pp->cmd_block_dma);
+        kfree(pp);
+}
+
+static void sil24_host_stop(struct ata_host_set *host_set)
+{
+        struct sil24_host_priv *hpriv = host_set->private_data;
+
+        iounmap(hpriv->host_base);
+        iounmap(hpriv->port_base);
+        kfree(hpriv);
+}
+
+static int sil24_init_one(struct pci_dev *pdev, const struct pci_device_id *ent)
+{
+        static int printed_version = 0;
+        unsigned int board_id = (unsigned int)ent->driver_data;
+        struct ata_port_info *pinfo = &sil24_port_info[board_id];
+        struct ata_probe_ent *probe_ent = NULL;
+        struct sil24_host_priv *hpriv = NULL;
+        void *host_base = NULL, *port_base = NULL;
+        int i, rc;
+
+        if (!printed_version++)
+                printk(KERN_DEBUG DRV_NAME " version " DRV_VERSION "\n");
+
+        rc = pci_enable_device(pdev);
+        if (rc)
+                return rc;
+
+        rc = pci_request_regions(pdev, DRV_NAME);
+        if (rc)
+                goto out_disable;
+
+        rc = -ENOMEM;
+        /* ioremap mmio registers */
+        host_base = ioremap(pci_resource_start(pdev, 0),
+                            pci_resource_len(pdev, 0));
+        if (!host_base)
+                goto out_free;
+        port_base = ioremap(pci_resource_start(pdev, 2),
+                            pci_resource_len(pdev, 2));
+        if (!port_base)
+                goto out_free;
+
+        /* allocate & init probe_ent and hpriv */
+        probe_ent = kmalloc(sizeof(*probe_ent), GFP_KERNEL);
+        if (!probe_ent)
+                goto out_free;
+
+        hpriv = kmalloc(sizeof(*hpriv), GFP_KERNEL);
+        if (!hpriv)
+                goto out_free;
+
+        memset(probe_ent, 0, sizeof(*probe_ent));
+        probe_ent->dev = pci_dev_to_dev(pdev);
+        INIT_LIST_HEAD(&probe_ent->node);
+
+        probe_ent->sht          = pinfo->sht;
+        probe_ent->host_flags   = pinfo->host_flags;
+        probe_ent->pio_mask     = pinfo->pio_mask;
+        probe_ent->udma_mask    = pinfo->udma_mask;
+        probe_ent->port_ops     = pinfo->port_ops;
+        probe_ent->n_ports      = SIL24_FLAG2NPORTS(pinfo->host_flags);
+
+        probe_ent->irq = pdev->irq;
+        probe_ent->irq_flags = SA_SHIRQ;
+        probe_ent->mmio_base = port_base;
+        probe_ent->private_data = hpriv;
+
+        memset(hpriv, 0, sizeof(*hpriv));
+        hpriv->host_base = host_base;
+        hpriv->port_base = port_base;
+
+        /*
+         * Configure the device
+         */
+        /*
+         * FIXME: This device is certainly 64-bit capable.  We just
+         * don't know how to use it.  After fixing 32bit activation in
+         * this function, enable 64bit masks here.
+         */
+        rc = pci_set_dma_mask(pdev, DMA_32BIT_MASK);
+        if (rc) {
+                printk(KERN_ERR DRV_NAME "(%s): 32-bit DMA enable failed\n",
+                       pci_name(pdev));
+                goto out_free;
+        }
+        rc = pci_set_consistent_dma_mask(pdev, DMA_32BIT_MASK);
+        if (rc) {
+                printk(KERN_ERR DRV_NAME "(%s): 32-bit consistent DMA enable failed\n",
+                       pci_name(pdev));
+                goto out_free;
+        }
+
+        /* GPIO off */
+        writel(0, host_base + HOST_FLASH_CMD);
+
+        /* Mask interrupts during initialization */
+        writel(0, host_base + HOST_CTRL);
+
+        for (i = 0; i < probe_ent->n_ports; i++) {
+                void *port = port_base + i * PORT_REGS_SIZE;
+                unsigned long portu = (unsigned long)port;
+                u32 tmp;
+                int cnt;
+
+                probe_ent->port[i].cmd_addr = portu + PORT_PRB;
+                probe_ent->port[i].scr_addr = portu + PORT_SCONTROL;
+
+                ata_std_ports(&probe_ent->port[i]);
+
+                /* Initial PHY setting */
+                writel(0x20c, port + PORT_PHY_CFG);
+
+                /* Clear port RST */
+                tmp = readl(port + PORT_CTRL_STAT);
+                if (tmp & PORT_CS_PORT_RST) {
+                        writel(PORT_CS_PORT_RST, port + PORT_CTRL_CLR);
+                        readl(port + PORT_CTRL_STAT);   /* sync */
+                        for (cnt = 0; cnt < 10; cnt++) {
+                                msleep(10);
+                                tmp = readl(port + PORT_CTRL_STAT);
+                                if (!(tmp & PORT_CS_PORT_RST))
+                                        break;
+                        }
+                        if (tmp & PORT_CS_PORT_RST)
+                                printk(KERN_ERR DRV_NAME
+                                       "(%s): failed to clear port RST\n",
+                                       pci_name(pdev));
+                }
+
+                /* Zero error counters. */
+                writel(0x8000, port + PORT_DECODE_ERR_THRESH);
+                writel(0x8000, port + PORT_CRC_ERR_THRESH);
+                writel(0x8000, port + PORT_HSHK_ERR_THRESH);
+                writel(0x0000, port + PORT_DECODE_ERR_CNT);
+                writel(0x0000, port + PORT_CRC_ERR_CNT);
+                writel(0x0000, port + PORT_HSHK_ERR_CNT);
+
+                /* FIXME: 32bit activation? */
+                writel(0, port + PORT_ACTIVATE_UPPER_ADDR);
+                writel(PORT_CS_32BIT_ACTV, port + PORT_CTRL_STAT);
+
+                /* Configure interrupts */
+                writel(0xffff, port + PORT_IRQ_ENABLE_CLR);
+                writel(PORT_IRQ_COMPLETE | PORT_IRQ_ERROR | PORT_IRQ_SDB_FIS,
+                       port + PORT_IRQ_ENABLE_SET);
+
+                /* Clear interrupts */
+                writel(0x0fff0fff, port + PORT_IRQ_STAT);
+                writel(PORT_CS_IRQ_WOC, port + PORT_CTRL_CLR);
+
+                /* Clear port multiplier enable and resume bits */
+                writel(PORT_CS_PM_EN | PORT_CS_RESUME, port + PORT_CTRL_CLR);
+
+                /* Reset itself */
+                if (__sil24_reset_controller(port))
+                        printk(KERN_ERR DRV_NAME
+                               "(%s): failed to reset controller\n",
+                               pci_name(pdev));
+        }
+
+        /* Turn on interrupts */
+        writel(IRQ_STAT_4PORTS, host_base + HOST_CTRL);
+
+        pci_set_master(pdev);
+
+        /* FIXME: check ata_device_add return value */
+        ata_device_add(probe_ent);
+
+        kfree(probe_ent);
+        return 0;
+
+ out_free:
+        if (host_base)
+                iounmap(host_base);
+        if (port_base)
+                iounmap(port_base);
+        kfree(probe_ent);
+        kfree(hpriv);
+        pci_release_regions(pdev);
+ out_disable:
+        pci_disable_device(pdev);
+        return rc;
+}
+
+static int __init sil24_init(void)
+{
+        return pci_module_init(&sil24_pci_driver);
+}
+
+static void __exit sil24_exit(void)
+{
+        pci_unregister_driver(&sil24_pci_driver);
+}
+
+MODULE_AUTHOR("Tejun Heo");
+MODULE_DESCRIPTION("Silicon Image 3124/3132 SATA low-level driver");
+MODULE_LICENSE("GPL");
+MODULE_DEVICE_TABLE(pci, sil24_pci_tbl);
+
+module_init(sil24_init);
+module_exit(sil24_exit);