MIPS/OCTEON/ata: Convert pata_octeon_cf.c to use device tree.

The patch needs to eliminate the definition of OCTEON_IRQ_BOOTDMA so
that the device tree code can map the interrupt, so in order to not
temporarily break things, we do a single patch to both the interrupt
registration code and the pata_octeon_cf driver.

Also rolled in is a conversion to use hrtimers and corrections to the
timing calculations.

Acked-by: Jeff Garzik <jgarzik@redhat.com>
Signed-off-by: David Daney <david.daney@cavium.com>

1 files changed, 284 insertions, 135 deletions

diff --git a/drivers/ata/pata_octeon_cf.c b/drivers/ata/pata_octeon_cf.c
index 1d61d5d278fa..652d035aa833 100644
--- a/drivers/ata/pata_octeon_cf.c
+++ b/drivers/ata/pata_octeon_cf.c
@@ -5,17 +5,19 @@
  * License.  See the file "COPYING" in the main directory of this archive
  * for more details.
  *
- * Copyright (C) 2005 - 2009 Cavium Networks
+ * Copyright (C) 2005 - 2012 Cavium Inc.
  * Copyright (C) 2008 Wind River Systems
  */
 
 #include <linux/kernel.h>
 #include <linux/module.h>
 #include <linux/libata.h>
-#include <linux/irq.h>
+#include <linux/hrtimer.h>
 #include <linux/slab.h>
+#include <linux/irq.h>
+#include <linux/of.h>
+#include <linux/of_platform.h>
 #include <linux/platform_device.h>
-#include <linux/workqueue.h>
 #include <scsi/scsi_host.h>
 
 #include <asm/octeon/octeon.h>
@@ -34,20 +36,36 @@
  */
 
 #define DRV_NAME        "pata_octeon_cf"
-#define DRV_VERSION     "2.1"
+#define DRV_VERSION     "2.2"
+
+/* Poll interval in nS. */
+#define OCTEON_CF_BUSY_POLL_INTERVAL 500000
 
+#define DMA_CFG 0
+#define DMA_TIM 0x20
+#define DMA_INT 0x38
+#define DMA_INT_EN 0x50
 
 struct octeon_cf_port {
-        struct workqueue_struct *wq;
-        struct delayed_work delayed_finish;
+        struct hrtimer delayed_finish;
         struct ata_port *ap;
         int dma_finished;
+        void            *c0;
+        unsigned int cs0;
+        unsigned int cs1;
+        bool is_true_ide;
+        u64 dma_base;
 };
 
 static struct scsi_host_template octeon_cf_sht = {
         ATA_PIO_SHT(DRV_NAME),
 };
 
+static int enable_dma;
+module_param(enable_dma, int, 0444);
+MODULE_PARM_DESC(enable_dma,
+                 "Enable use of DMA on interfaces that support it (0=no dma [default], 1=use dma)");
+
 /**
  * Convert nanosecond based time to setting used in the
  * boot bus timing register, based on timing multiple
@@ -66,12 +84,29 @@ static unsigned int ns_to_tim_reg(unsigned int tim_mult, unsigned int nsecs)
         return val;
 }
 
-static void octeon_cf_set_boot_reg_cfg(int cs)
+static void octeon_cf_set_boot_reg_cfg(int cs, unsigned int multiplier)
 {
         union cvmx_mio_boot_reg_cfgx reg_cfg;
+        unsigned int tim_mult;
+
+        switch (multiplier) {
+        case 8:
+                tim_mult = 3;
+                break;
+        case 4:
+                tim_mult = 0;
+                break;
+        case 2:
+                tim_mult = 2;
+                break;
+        default:
+                tim_mult = 1;
+                break;
+        }
+
         reg_cfg.u64 = cvmx_read_csr(CVMX_MIO_BOOT_REG_CFGX(cs));
         reg_cfg.s.dmack = 0;    /* Don't assert DMACK on access */
-        reg_cfg.s.tim_mult = 2; /* Timing mutiplier 2x */
+        reg_cfg.s.tim_mult = tim_mult;  /* Timing mutiplier */
         reg_cfg.s.rd_dly = 0;   /* Sample on falling edge of BOOT_OE */
         reg_cfg.s.sam = 0;      /* Don't combine write and output enable */
         reg_cfg.s.we_ext = 0;   /* No write enable extension */
@@ -92,12 +127,12 @@ static void octeon_cf_set_boot_reg_cfg(int cs)
  */
 static void octeon_cf_set_piomode(struct ata_port *ap, struct ata_device *dev)
 {
-        struct octeon_cf_data *ocd = ap->dev->platform_data;
+        struct octeon_cf_port *cf_port = ap->private_data;
         union cvmx_mio_boot_reg_timx reg_tim;
-        int cs = ocd->base_region;
         int T;
         struct ata_timing timing;
 
+        unsigned int div;
         int use_iordy;
         int trh;
         int pause;
@@ -106,7 +141,15 @@ static void octeon_cf_set_piomode(struct ata_port *ap, struct ata_device *dev)
         int t2;
         int t2i;
 
-        T = (int)(2000000000000LL / octeon_get_clock_rate());
+        /*
+         * A divisor value of four will overflow the timing fields at
+         * clock rates greater than 800MHz
+         */
+        if (octeon_get_io_clock_rate() <= 800000000)
+                div = 4;
+        else
+                div = 8;
+        T = (int)((1000000000000LL * div) / octeon_get_io_clock_rate());
 
         if (ata_timing_compute(dev, dev->pio_mode, &timing, T, T))
                 BUG();
@@ -121,23 +164,26 @@ static void octeon_cf_set_piomode(struct ata_port *ap, struct ata_device *dev)
         if (t2i)
                 t2i--;
 
-        trh = ns_to_tim_reg(2, 20);
+        trh = ns_to_tim_reg(div, 20);
         if (trh)
                 trh--;
 
-        pause = timing.cycle - timing.active - timing.setup - trh;
+        pause = (int)timing.cycle - (int)timing.active -
+                (int)timing.setup - trh;
+        if (pause < 0)
+                pause = 0;
         if (pause)
                 pause--;
 
-        octeon_cf_set_boot_reg_cfg(cs);
-        if (ocd->dma_engine >= 0)
+        octeon_cf_set_boot_reg_cfg(cf_port->cs0, div);
+        if (cf_port->is_true_ide)
                 /* True IDE mode, program both chip selects.  */
-                octeon_cf_set_boot_reg_cfg(cs + 1);
+                octeon_cf_set_boot_reg_cfg(cf_port->cs1, div);
 
 
         use_iordy = ata_pio_need_iordy(dev);
 
-        reg_tim.u64 = cvmx_read_csr(CVMX_MIO_BOOT_REG_TIMX(cs));
+        reg_tim.u64 = cvmx_read_csr(CVMX_MIO_BOOT_REG_TIMX(cf_port->cs0));
         /* Disable page mode */
         reg_tim.s.pagem = 0;
         /* Enable dynamic timing */
@@ -161,20 +207,22 @@ static void octeon_cf_set_piomode(struct ata_port *ap, struct ata_device *dev)
         /* How long read enable is asserted */
         reg_tim.s.oe = t2;
         /* Time after CE that read/write starts */
-        reg_tim.s.ce = ns_to_tim_reg(2, 5);
+        reg_tim.s.ce = ns_to_tim_reg(div, 5);
         /* Time before CE that address is valid */
         reg_tim.s.adr = 0;
 
         /* Program the bootbus region timing for the data port chip select. */
-        cvmx_write_csr(CVMX_MIO_BOOT_REG_TIMX(cs), reg_tim.u64);
-        if (ocd->dma_engine >= 0)
+        cvmx_write_csr(CVMX_MIO_BOOT_REG_TIMX(cf_port->cs0), reg_tim.u64);
+        if (cf_port->is_true_ide)
                 /* True IDE mode, program both chip selects.  */
-                cvmx_write_csr(CVMX_MIO_BOOT_REG_TIMX(cs + 1), reg_tim.u64);
+                cvmx_write_csr(CVMX_MIO_BOOT_REG_TIMX(cf_port->cs1),
+                               reg_tim.u64);
 }
 
 static void octeon_cf_set_dmamode(struct ata_port *ap, struct ata_device *dev)
 {
-        struct octeon_cf_data *ocd = dev->link->ap->dev->platform_data;
+        struct octeon_cf_port *cf_port = ap->private_data;
+        union cvmx_mio_boot_pin_defs pin_defs;
         union cvmx_mio_boot_dma_timx dma_tim;
         unsigned int oe_a;
         unsigned int oe_n;
@@ -183,6 +231,7 @@ static void octeon_cf_set_dmamode(struct ata_port *ap, struct ata_device *dev)
         unsigned int pause;
         unsigned int T0, Tkr, Td;
         unsigned int tim_mult;
+        int c;
 
         const struct ata_timing *timing;
 
@@ -199,13 +248,19 @@ static void octeon_cf_set_dmamode(struct ata_port *ap, struct ata_device *dev)
         /* not spec'ed, value in eclocks, not affected by tim_mult */
         dma_arq = 8;
         pause = 25 - dma_arq * 1000 /
-                (octeon_get_clock_rate() / 1000000); /* Tz */
+                (octeon_get_io_clock_rate() / 1000000); /* Tz */
 
         oe_a = Td;
         /* Tkr from cf spec, lengthened to meet T0 */
         oe_n = max(T0 - oe_a, Tkr);
 
-        dma_tim.s.dmack_pi = 1;
+        pin_defs.u64 = cvmx_read_csr(CVMX_MIO_BOOT_PIN_DEFS);
+
+        /* DMA channel number. */
+        c = (cf_port->dma_base & 8) >> 3;
+
+        /* Invert the polarity if the default is 0*/
+        dma_tim.s.dmack_pi = (pin_defs.u64 & (1ull << (11 + c))) ? 0 : 1;
 
         dma_tim.s.oe_n = ns_to_tim_reg(tim_mult, oe_n);
         dma_tim.s.oe_a = ns_to_tim_reg(tim_mult, oe_a);
@@ -228,14 +283,11 @@ static void octeon_cf_set_dmamode(struct ata_port *ap, struct ata_device *dev)
 
         pr_debug("ns to ticks (mult %d) of %d is: %d\n", tim_mult, 60,
                  ns_to_tim_reg(tim_mult, 60));
-        pr_debug("oe_n: %d, oe_a: %d, dmack_s: %d, dmack_h: "
-                 "%d, dmarq: %d, pause: %d\n",
+        pr_debug("oe_n: %d, oe_a: %d, dmack_s: %d, dmack_h: %d, dmarq: %d, pause: %d\n",
                  dma_tim.s.oe_n, dma_tim.s.oe_a, dma_tim.s.dmack_s,
                  dma_tim.s.dmack_h, dma_tim.s.dmarq, dma_tim.s.pause);
 
-        cvmx_write_csr(CVMX_MIO_BOOT_DMA_TIMX(ocd->dma_engine),
-                       dma_tim.u64);
-
+        cvmx_write_csr(cf_port->dma_base + DMA_TIM, dma_tim.u64);
 }
 
 /**
@@ -489,15 +541,10 @@ static void octeon_cf_exec_command16(struct ata_port *ap,
         ata_wait_idle(ap);
 }
 
-static void octeon_cf_irq_on(struct ata_port *ap)
+static void octeon_cf_ata_port_noaction(struct ata_port *ap)
 {
 }
 
-static void octeon_cf_irq_clear(struct ata_port *ap)
-{
-        return;
-}
-
 static void octeon_cf_dma_setup(struct ata_queued_cmd *qc)
 {
         struct ata_port *ap = qc->ap;
@@ -519,7 +566,7 @@ static void octeon_cf_dma_setup(struct ata_queued_cmd *qc)
  */
 static void octeon_cf_dma_start(struct ata_queued_cmd *qc)
 {
-        struct octeon_cf_data *ocd = qc->ap->dev->platform_data;
+        struct octeon_cf_port *cf_port = qc->ap->private_data;
         union cvmx_mio_boot_dma_cfgx mio_boot_dma_cfg;
         union cvmx_mio_boot_dma_intx mio_boot_dma_int;
         struct scatterlist *sg;
@@ -535,12 +582,10 @@ static void octeon_cf_dma_start(struct ata_queued_cmd *qc)
          */
         mio_boot_dma_int.u64 = 0;
         mio_boot_dma_int.s.done = 1;
-        cvmx_write_csr(CVMX_MIO_BOOT_DMA_INTX(ocd->dma_engine),
-                       mio_boot_dma_int.u64);
+        cvmx_write_csr(cf_port->dma_base + DMA_INT, mio_boot_dma_int.u64);
 
         /* Enable the interrupt.  */
-        cvmx_write_csr(CVMX_MIO_BOOT_DMA_INT_ENX(ocd->dma_engine),
-                       mio_boot_dma_int.u64);
+        cvmx_write_csr(cf_port->dma_base + DMA_INT_EN, mio_boot_dma_int.u64);
 
         /* Set the direction of the DMA */
         mio_boot_dma_cfg.u64 = 0;
@@ -569,8 +614,7 @@ static void octeon_cf_dma_start(struct ata_queued_cmd *qc)
                 (mio_boot_dma_cfg.s.rw) ? "write" : "read", sg->length,
                 (void *)(unsigned long)mio_boot_dma_cfg.s.adr);
 
-        cvmx_write_csr(CVMX_MIO_BOOT_DMA_CFGX(ocd->dma_engine),
-                       mio_boot_dma_cfg.u64);
+        cvmx_write_csr(cf_port->dma_base + DMA_CFG, mio_boot_dma_cfg.u64);
 }
 
 /**
@@ -583,10 +627,9 @@ static unsigned int octeon_cf_dma_finished(struct ata_port *ap,
                                         struct ata_queued_cmd *qc)
 {
         struct ata_eh_info *ehi = &ap->link.eh_info;
-        struct octeon_cf_data *ocd = ap->dev->platform_data;
+        struct octeon_cf_port *cf_port = ap->private_data;
         union cvmx_mio_boot_dma_cfgx dma_cfg;
         union cvmx_mio_boot_dma_intx dma_int;
-        struct octeon_cf_port *cf_port;
         u8 status;
 
         VPRINTK("ata%u: protocol %d task_state %d\n",
@@ -596,9 +639,7 @@ static unsigned int octeon_cf_dma_finished(struct ata_port *ap,
         if (ap->hsm_task_state != HSM_ST_LAST)
                 return 0;
 
-        cf_port = ap->private_data;
-
-        dma_cfg.u64 = cvmx_read_csr(CVMX_MIO_BOOT_DMA_CFGX(ocd->dma_engine));
+        dma_cfg.u64 = cvmx_read_csr(cf_port->dma_base + DMA_CFG);
         if (dma_cfg.s.size != 0xfffff) {
                 /* Error, the transfer was not complete.  */
                 qc->err_mask |= AC_ERR_HOST_BUS;
@@ -608,15 +649,15 @@ static unsigned int octeon_cf_dma_finished(struct ata_port *ap,
         /* Stop and clear the dma engine.  */
         dma_cfg.u64 = 0;
         dma_cfg.s.size = -1;
-        cvmx_write_csr(CVMX_MIO_BOOT_DMA_CFGX(ocd->dma_engine), dma_cfg.u64);
+        cvmx_write_csr(cf_port->dma_base + DMA_CFG, dma_cfg.u64);
 
         /* Disable the interrupt.  */
         dma_int.u64 = 0;
-        cvmx_write_csr(CVMX_MIO_BOOT_DMA_INT_ENX(ocd->dma_engine), dma_int.u64);
+        cvmx_write_csr(cf_port->dma_base + DMA_INT_EN, dma_int.u64);
 
         /* Clear the DMA complete status */
         dma_int.s.done = 1;
-        cvmx_write_csr(CVMX_MIO_BOOT_DMA_INTX(ocd->dma_engine), dma_int.u64);
+        cvmx_write_csr(cf_port->dma_base + DMA_INT, dma_int.u64);
 
         status = ap->ops->sff_check_status(ap);
 
@@ -649,69 +690,68 @@ static irqreturn_t octeon_cf_interrupt(int irq, void *dev_instance)
                 struct ata_queued_cmd *qc;
                 union cvmx_mio_boot_dma_intx dma_int;
                 union cvmx_mio_boot_dma_cfgx dma_cfg;
-                struct octeon_cf_data *ocd;
 
                 ap = host->ports[i];
-                ocd = ap->dev->platform_data;
                 cf_port = ap->private_data;
-                dma_int.u64 =
-                        cvmx_read_csr(CVMX_MIO_BOOT_DMA_INTX(ocd->dma_engine));
-                dma_cfg.u64 =
-                        cvmx_read_csr(CVMX_MIO_BOOT_DMA_CFGX(ocd->dma_engine));
+
+                dma_int.u64 = cvmx_read_csr(cf_port->dma_base + DMA_INT);
+                dma_cfg.u64 = cvmx_read_csr(cf_port->dma_base + DMA_CFG);
 
                 qc = ata_qc_from_tag(ap, ap->link.active_tag);
 
-                if (qc && !(qc->tf.flags & ATA_TFLAG_POLLING)) {
-                        if (dma_int.s.done && !dma_cfg.s.en) {
-                                if (!sg_is_last(qc->cursg)) {
-                                        qc->cursg = sg_next(qc->cursg);
-                                        handled = 1;
-                                        octeon_cf_dma_start(qc);
-                                        continue;
-                                } else {
-                                        cf_port->dma_finished = 1;
-                                }
-                        }
-                        if (!cf_port->dma_finished)
-                                continue;
-                        status = ioread8(ap->ioaddr.altstatus_addr);
-                        if (status & (ATA_BUSY | ATA_DRQ)) {
-                                /*
-                                 * We are busy, try to handle it
-                                 * later.  This is the DMA finished
-                                 * interrupt, and it could take a
-                                 * little while for the card to be
-                                 * ready for more commands.
-                                 */
-                                /* Clear DMA irq. */
-                                dma_int.u64 = 0;
-                                dma_int.s.done = 1;
-                                cvmx_write_csr(CVMX_MIO_BOOT_DMA_INTX(ocd->dma_engine),
-                                               dma_int.u64);
-
-                                queue_delayed_work(cf_port->wq,
-                                                   &cf_port->delayed_finish, 1);
+                if (!qc || (qc->tf.flags & ATA_TFLAG_POLLING))
+                        continue;
+
+                if (dma_int.s.done && !dma_cfg.s.en) {
+                        if (!sg_is_last(qc->cursg)) {
+                                qc->cursg = sg_next(qc->cursg);
                                 handled = 1;
+                                octeon_cf_dma_start(qc);
+                                continue;
                         } else {
-                                handled |= octeon_cf_dma_finished(ap, qc);
+                                cf_port->dma_finished = 1;
                         }
                 }
+                if (!cf_port->dma_finished)
+                        continue;
+                status = ioread8(ap->ioaddr.altstatus_addr);
+                if (status & (ATA_BUSY | ATA_DRQ)) {
+                        /*
+                         * We are busy, try to handle it later.  This
+                         * is the DMA finished interrupt, and it could
+                         * take a little while for the card to be
+                         * ready for more commands.
+                         */
+                        /* Clear DMA irq. */
+                        dma_int.u64 = 0;
+                        dma_int.s.done = 1;
+                        cvmx_write_csr(cf_port->dma_base + DMA_INT,
+                                       dma_int.u64);
+                        hrtimer_start_range_ns(&cf_port->delayed_finish,
+                                               ns_to_ktime(OCTEON_CF_BUSY_POLL_INTERVAL),
+                                               OCTEON_CF_BUSY_POLL_INTERVAL / 5,
+                                               HRTIMER_MODE_REL);
+                        handled = 1;
+                } else {
+                        handled |= octeon_cf_dma_finished(ap, qc);
+                }
         }
         spin_unlock_irqrestore(&host->lock, flags);
         DPRINTK("EXIT\n");
         return IRQ_RETVAL(handled);
 }
 
-static void octeon_cf_delayed_finish(struct work_struct *work)
+static enum hrtimer_restart octeon_cf_delayed_finish(struct hrtimer *hrt)
 {
-        struct octeon_cf_port *cf_port = container_of(work,
+        struct octeon_cf_port *cf_port = container_of(hrt,
                                                       struct octeon_cf_port,
-                                                      delayed_finish.work);
+                                                      delayed_finish);
         struct ata_port *ap = cf_port->ap;
         struct ata_host *host = ap->host;
         struct ata_queued_cmd *qc;
         unsigned long flags;
         u8 status;
+        enum hrtimer_restart rv = HRTIMER_NORESTART;
 
         spin_lock_irqsave(&host->lock, flags);
 
@@ -726,15 +766,17 @@ static void octeon_cf_delayed_finish(struct work_struct *work)
         status = ioread8(ap->ioaddr.altstatus_addr);
         if (status & (ATA_BUSY | ATA_DRQ)) {
                 /* Still busy, try again. */
-                queue_delayed_work(cf_port->wq,
-                                   &cf_port->delayed_finish, 1);
+                hrtimer_forward_now(hrt,
+                                    ns_to_ktime(OCTEON_CF_BUSY_POLL_INTERVAL));
+                rv = HRTIMER_RESTART;
                 goto out;
         }
         qc = ata_qc_from_tag(ap, ap->link.active_tag);
-        if (qc && !(qc->tf.flags & ATA_TFLAG_POLLING))
+        if (qc && (!(qc->tf.flags & ATA_TFLAG_POLLING)))
                 octeon_cf_dma_finished(ap, qc);
 out:
         spin_unlock_irqrestore(&host->lock, flags);
+        return rv;
 }
 
 static void octeon_cf_dev_config(struct ata_device *dev)
@@ -786,8 +828,8 @@ static struct ata_port_operations octeon_cf_ops = {
         .qc_prep                = ata_noop_qc_prep,
         .qc_issue               = octeon_cf_qc_issue,
         .sff_dev_select         = octeon_cf_dev_select,
-        .sff_irq_on             = octeon_cf_irq_on,
-        .sff_irq_clear          = octeon_cf_irq_clear,
+        .sff_irq_on             = octeon_cf_ata_port_noaction,
+        .sff_irq_clear          = octeon_cf_ata_port_noaction,
         .cable_detect           = ata_cable_40wire,
         .set_piomode            = octeon_cf_set_piomode,
         .set_dmamode            = octeon_cf_set_dmamode,
@@ -798,46 +840,113 @@ static int __devinit octeon_cf_probe(struct platform_device *pdev)
 {
         struct resource *res_cs0, *res_cs1;
 
+        bool is_16bit;
+        const __be32 *cs_num;
+        struct property *reg_prop;
+        int n_addr, n_size, reg_len;
+        struct device_node *node;
+        const void *prop;
         void __iomem *cs0;
         void __iomem *cs1 = NULL;
         struct ata_host *host;
         struct ata_port *ap;
-        struct octeon_cf_data *ocd;
         int irq = 0;
         irq_handler_t irq_handler = NULL;
         void __iomem *base;
         struct octeon_cf_port *cf_port;
-        char version[32];
+        int rv = -ENOMEM;
 
-        res_cs0 = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 
-        if (!res_cs0)
+        node = pdev->dev.of_node;
+        if (node == NULL)
                 return -EINVAL;
 
-        ocd = pdev->dev.platform_data;
+        cf_port = kzalloc(sizeof(*cf_port), GFP_KERNEL);
+        if (!cf_port)
+                return -ENOMEM;
 
-        cs0 = devm_ioremap_nocache(&pdev->dev, res_cs0->start,
-                                   resource_size(res_cs0));
+        cf_port->is_true_ide = (of_find_property(node, "cavium,true-ide", NULL) != NULL);
 
-        if (!cs0)
-                return -ENOMEM;
+        prop = of_get_property(node, "cavium,bus-width", NULL);
+        if (prop)
+                is_16bit = (be32_to_cpup(prop) == 16);
+        else
+                is_16bit = false;
 
-        /* Determine from availability of DMA if True IDE mode or not */
-        if (ocd->dma_engine >= 0) {
-                res_cs1 = platform_get_resource(pdev, IORESOURCE_MEM, 1);
-                if (!res_cs1)
-                        return -EINVAL;
+        n_addr = of_n_addr_cells(node);
+        n_size = of_n_size_cells(node);
 
+        reg_prop = of_find_property(node, "reg", &reg_len);
+        if (!reg_prop || reg_len < sizeof(__be32)) {
+                rv = -EINVAL;
+                goto free_cf_port;
+        }
+        cs_num = reg_prop->value;
+        cf_port->cs0 = be32_to_cpup(cs_num);
+
+        if (cf_port->is_true_ide) {
+                struct device_node *dma_node;
+                dma_node = of_parse_phandle(node,
+                                            "cavium,dma-engine-handle", 0);
+                if (dma_node) {
+                        struct platform_device *dma_dev;
+                        dma_dev = of_find_device_by_node(dma_node);
+                        if (dma_dev) {
+                                struct resource *res_dma;
+                                int i;
+                                res_dma = platform_get_resource(dma_dev, IORESOURCE_MEM, 0);
+                                if (!res_dma) {
+                                        of_node_put(dma_node);
+                                        rv = -EINVAL;
+                                        goto free_cf_port;
+                                }
+                                cf_port->dma_base = (u64)devm_ioremap_nocache(&pdev->dev, res_dma->start,
+                                                                         resource_size(res_dma));
+
+                                if (!cf_port->dma_base) {
+                                        of_node_put(dma_node);
+                                        rv = -EINVAL;
+                                        goto free_cf_port;
+                                }
+
+                                irq_handler = octeon_cf_interrupt;
+                                i = platform_get_irq(dma_dev, 0);
+                                if (i > 0)
+                                        irq = i;
+                        }
+                        of_node_put(dma_node);
+                }
+                res_cs1 = platform_get_resource(pdev, IORESOURCE_MEM, 1);
+                if (!res_cs1) {
+                        rv = -EINVAL;
+                        goto free_cf_port;
+                }
                 cs1 = devm_ioremap_nocache(&pdev->dev, res_cs1->start,
-                                           resource_size(res_cs1));
+                                           res_cs1->end - res_cs1->start + 1);
 
                 if (!cs1)
-                        return -ENOMEM;
+                        goto free_cf_port;
+
+                if (reg_len < (n_addr + n_size + 1) * sizeof(__be32)) {
+                        rv = -EINVAL;
+                        goto free_cf_port;
+                }
+                cs_num += n_addr + n_size;
+                cf_port->cs1 = be32_to_cpup(cs_num);
         }
 
-        cf_port = kzalloc(sizeof(*cf_port), GFP_KERNEL);
-        if (!cf_port)
-                return -ENOMEM;
+        res_cs0 = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+
+        if (!res_cs0) {
+                rv = -EINVAL;
+                goto free_cf_port;
+        }
+
+        cs0 = devm_ioremap_nocache(&pdev->dev, res_cs0->start,
+                                   resource_size(res_cs0));
+
+        if (!cs0)
+                goto free_cf_port;
 
         /* allocate host */
         host = ata_host_alloc(&pdev->dev, 1);
@@ -846,21 +955,22 @@ static int __devinit octeon_cf_probe(struct platform_device *pdev)
 
         ap = host->ports[0];
         ap->private_data = cf_port;
+        pdev->dev.platform_data = cf_port;
         cf_port->ap = ap;
         ap->ops = &octeon_cf_ops;
         ap->pio_mask = ATA_PIO6;
         ap->flags |= ATA_FLAG_NO_ATAPI | ATA_FLAG_PIO_POLLING;
 
-        base = cs0 + ocd->base_region_bias;
-        if (!ocd->is16bit) {
+        if (!is_16bit) {
+                base = cs0 + 0x800;
                 ap->ioaddr.cmd_addr     = base;
                 ata_sff_std_ports(&ap->ioaddr);
 
                 ap->ioaddr.altstatus_addr = base + 0xe;
                 ap->ioaddr.ctl_addr     = base + 0xe;
                 octeon_cf_ops.sff_data_xfer = octeon_cf_data_xfer8;
-        } else if (cs1) {
-                /* Presence of cs1 indicates True IDE mode.  */
+        } else if (cf_port->is_true_ide) {
+                base = cs0;
                 ap->ioaddr.cmd_addr     = base + (ATA_REG_CMD << 1) + 1;
                 ap->ioaddr.data_addr    = base + (ATA_REG_DATA << 1);
                 ap->ioaddr.error_addr   = base + (ATA_REG_ERR << 1) + 1;
@@ -876,19 +986,15 @@ static int __devinit octeon_cf_probe(struct platform_device *pdev)
                 ap->ioaddr.ctl_addr     = cs1 + (6 << 1) + 1;
                 octeon_cf_ops.sff_data_xfer = octeon_cf_data_xfer16;
 
-                ap->mwdma_mask  = ATA_MWDMA4;
-                irq = platform_get_irq(pdev, 0);
-                irq_handler = octeon_cf_interrupt;
-
-                /* True IDE mode needs delayed work to poll for not-busy.  */
-                cf_port->wq = create_singlethread_workqueue(DRV_NAME);
-                if (!cf_port->wq)
-                        goto free_cf_port;
-                INIT_DELAYED_WORK(&cf_port->delayed_finish,
-                                  octeon_cf_delayed_finish);
+                ap->mwdma_mask  = enable_dma ? ATA_MWDMA4 : 0;
 
+                /* True IDE mode needs a timer to poll for not-busy.  */
+                hrtimer_init(&cf_port->delayed_finish, CLOCK_MONOTONIC,
+                             HRTIMER_MODE_REL);
+                cf_port->delayed_finish.function = octeon_cf_delayed_finish;
         } else {
                 /* 16 bit but not True IDE */
+                base = cs0 + 0x800;
                 octeon_cf_ops.sff_data_xfer     = octeon_cf_data_xfer16;
                 octeon_cf_ops.softreset         = octeon_cf_softreset16;
                 octeon_cf_ops.sff_check_status  = octeon_cf_check_status16;
@@ -902,28 +1008,71 @@ static int __devinit octeon_cf_probe(struct platform_device *pdev)
                 ap->ioaddr.ctl_addr     = base + 0xe;
                 ap->ioaddr.altstatus_addr = base + 0xe;
         }
+        cf_port->c0 = ap->ioaddr.ctl_addr;
+
+        pdev->dev.coherent_dma_mask = DMA_BIT_MASK(64);
+        pdev->dev.dma_mask = &pdev->dev.coherent_dma_mask;
 
         ata_port_desc(ap, "cmd %p ctl %p", base, ap->ioaddr.ctl_addr);
 
 
-        snprintf(version, sizeof(version), "%s %d bit%s",
-                 DRV_VERSION,
-                 (ocd->is16bit) ? 16 : 8,
-                 (cs1) ? ", True IDE" : "");
-        ata_print_version_once(&pdev->dev, version);
+        dev_info(&pdev->dev, "version " DRV_VERSION" %d bit%s.\n",
+                 is_16bit ? 16 : 8,
+                 cf_port->is_true_ide ? ", True IDE" : "");
 
-        return ata_host_activate(host, irq, irq_handler, 0, &octeon_cf_sht);
+        return ata_host_activate(host, irq, irq_handler,
+                                 IRQF_SHARED, &octeon_cf_sht);
 
 free_cf_port:
         kfree(cf_port);
-        return -ENOMEM;
+        return rv;
+}
+
+static void octeon_cf_shutdown(struct device *dev)
+{
+        union cvmx_mio_boot_dma_cfgx dma_cfg;
+        union cvmx_mio_boot_dma_intx dma_int;
+
+        struct octeon_cf_port *cf_port = dev->platform_data;
+
+        if (cf_port->dma_base) {
+                /* Stop and clear the dma engine.  */
+                dma_cfg.u64 = 0;
+                dma_cfg.s.size = -1;
+                cvmx_write_csr(cf_port->dma_base + DMA_CFG, dma_cfg.u64);
+
+                /* Disable the interrupt.  */
+                dma_int.u64 = 0;
+                cvmx_write_csr(cf_port->dma_base + DMA_INT_EN, dma_int.u64);
+
+                /* Clear the DMA complete status */
+                dma_int.s.done = 1;
+                cvmx_write_csr(cf_port->dma_base + DMA_INT, dma_int.u64);
+
+                __raw_writeb(0, cf_port->c0);
+                udelay(20);
+                __raw_writeb(ATA_SRST, cf_port->c0);
+                udelay(20);
+                __raw_writeb(0, cf_port->c0);
+                mdelay(100);
+        }
 }
 
+static struct of_device_id octeon_cf_match[] = {
+        {
+                .compatible = "cavium,ebt3000-compact-flash",
+        },
+        {},
+};
+MODULE_DEVICE_TABLE(of, octeon_i2c_match);
+
 static struct platform_driver octeon_cf_driver = {
         .probe          = octeon_cf_probe,
         .driver         = {
                 .name   = DRV_NAME,
                 .owner  = THIS_MODULE,
+                .of_match_table = octeon_cf_match,
+                .shutdown = octeon_cf_shutdown
         },
 };