[PATCH 3/3] New 'acard-ahci' driver for Acard ATP8620 support
From: Jeff Garzik
Date: Sun Apr 12 2009 - 13:26:57 EST
commit b40bffe7cfe8bb592018026bbcf2719fc11ca8f2
Author: Jeff Garzik <jeff@xxxxxxxxxx>
Date: Sun Apr 12 13:14:19 2009 -0400
libata: Add new 'acard-ahci' driver for ACard ATP8620 chips
NOT-Signed-off-by: Jeff Garzik <jgarzik@xxxxxxxxxx>
drivers/ata/Kconfig | 9 +
drivers/ata/Makefile | 1
drivers/ata/acard-ahci.c | 350 +++++++++++++++++++++++++++++++++++++++++++++++
drivers/ata/ahci.c | 94 ------------
drivers/ata/ahci.h | 3
drivers/ata/libahci.c | 98 +++++++++++++
6 files changed, 462 insertions(+), 93 deletions(-)
diff --git a/drivers/ata/Kconfig b/drivers/ata/Kconfig
index 2b697fe..088a2a8 100644
--- a/drivers/ata/Kconfig
+++ b/drivers/ata/Kconfig
@@ -55,6 +55,15 @@ config SATA_AHCI
If unsure, say N.
+config SATA_ACARD_AHCI
+ tristate "ACard AHCI variant (ATP 8620)"
+ depends on PCI
+ help
+ This option enables support for AHCI-like chips
+ from ACard: 8620
+
+ If unsure, say N.
+
config SATA_SIL24
tristate "Silicon Image 3124/3132 SATA support"
depends on PCI
diff --git a/drivers/ata/Makefile b/drivers/ata/Makefile
index 6055016..a36c53a 100644
--- a/drivers/ata/Makefile
+++ b/drivers/ata/Makefile
@@ -2,6 +2,7 @@
obj-$(CONFIG_ATA) += libata.o
obj-$(CONFIG_SATA_AHCI) += libahci.o ahci.o
+obj-$(CONFIG_SATA_ACARD_AHCI) += libahci.o acard-ahci.o
obj-$(CONFIG_SATA_SVW) += sata_svw.o
obj-$(CONFIG_ATA_PIIX) += ata_piix.o
obj-$(CONFIG_SATA_PROMISE) += sata_promise.o
diff --git a/drivers/ata/acard-ahci.c b/drivers/ata/acard-ahci.c
new file mode 100644
index 0000000..0980ace
--- /dev/null
+++ b/drivers/ata/acard-ahci.c
@@ -0,0 +1,350 @@
+
+/*
+ * acard-ahci.c - ACard AHCI SATA support
+ *
+ * Maintained by: Jeff Garzik <jgarzik@xxxxxxxxx>
+ * Please ALWAYS copy linux-ide@xxxxxxxxxxxxxxx
+ * on emails.
+ *
+ * Copyright 2009 Red Hat, Inc.
+ *
+ *
+ * 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; see the file COPYING. If not, write to
+ * the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
+ *
+ *
+ * libata documentation is available via 'make {ps|pdf}docs',
+ * as Documentation/DocBook/libata.*
+ *
+ * AHCI hardware documentation:
+ * http://www.intel.com/technology/serialata/pdf/rev1_0.pdf
+ * http://www.intel.com/technology/serialata/pdf/rev1_1.pdf
+ * http://gkernel.sourceforge.net/specs/acard/ATP8620pub_Rev0.98.pdf
+ *
+ */
+
+#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/interrupt.h>
+#include <linux/dma-mapping.h>
+#include <linux/device.h>
+#include <linux/dmi.h>
+#include <scsi/scsi_host.h>
+#include <scsi/scsi_cmnd.h>
+#include <linux/libata.h>
+#include "ahci.h"
+
+#define DRV_NAME "acard-ahci"
+#define DRV_VERSION "0.5"
+
+enum {
+ board_ahci_acard = 0,
+};
+
+struct acard_sg {
+ __le32 addr;
+ __le32 addr_hi;
+ __le32 flags; /* bit 31 == EOT */
+ __le32 size; /* max==0x10000 (64k) */
+};
+
+static void acard_qc_prep(struct ata_queued_cmd *qc);
+
+static struct device_attribute *acard_ahci_shost_attrs[] = {
+ &dev_attr_link_power_management_policy,
+ &dev_attr_em_message_type,
+ &dev_attr_em_message,
+ NULL
+};
+
+static struct device_attribute *acard_ahci_sdev_attrs[] = {
+ &dev_attr_sw_activity,
+ &dev_attr_unload_heads,
+ NULL
+};
+
+static struct scsi_host_template acard_sht = {
+ ATA_NCQ_SHT(DRV_NAME),
+ .can_queue = AHCI_MAX_CMDS - 1,
+ .sg_tablesize = AHCI_MAX_SG,
+
+ /* we don't really care about the DMA boundary... we use this
+ * to limit our DMA segment size to 64k
+ */
+ .dma_boundary = ATA_DMA_BOUNDARY,
+ .shost_attrs = acard_ahci_shost_attrs,
+ .sdev_attrs = acard_ahci_sdev_attrs,
+};
+
+static struct ata_port_operations acard_ops = {
+ .inherits = &ahci_base_ops,
+ .qc_prep = acard_qc_prep,
+};
+
+static const struct ata_port_info acard_ahci_port_info[] = {
+ [board_ahci_acard] =
+ {
+ .flags = AHCI_FLAG_COMMON,
+ .pio_mask = ATA_PIO4,
+ .udma_mask = ATA_UDMA6,
+ .port_ops = &acard_ops,
+ },
+};
+
+static const struct pci_device_id acard_ahci_pci_tbl[] = {
+ { PCI_VDEVICE(ARTOP, 0x000D), board_ahci_acard },
+
+ { } /* terminate list */
+};
+
+static int ahci_ignore_sss;
+module_param_named(ignore_sss, ahci_ignore_sss, int, 0444);
+MODULE_PARM_DESC(ignore_sss, "Ignore staggered spinup flag (0=don't ignore, 1=ignore)");
+
+static int ahci_em_messages = 1;
+module_param(ahci_em_messages, int, 0444);
+/* add other LED protocol types when they become supported */
+MODULE_PARM_DESC(ahci_em_messages,
+ "Set AHCI Enclosure Management Message type (0 = disabled, 1 = LED");
+
+static unsigned int acard_fill_sg(struct ata_queued_cmd *qc, void *cmd_tbl)
+{
+ struct scatterlist *sg;
+ struct acard_sg *acard_sg = cmd_tbl + AHCI_CMD_TBL_HDR_SZ;
+ unsigned int si, last_si = 0;
+
+ VPRINTK("ENTER\n");
+
+ /*
+ * Next, the S/G list.
+ */
+ for_each_sg(qc->sg, sg, qc->n_elem, si) {
+ dma_addr_t addr = sg_dma_address(sg);
+ u32 sg_len = sg_dma_len(sg);
+
+ /* ACard note: flags and size are different
+ * fields, rather than AHCI's flags_size,
+ * we must set an end-of-table (EOT) bit,
+ * and the segment cannot exceed 64k (0x10000)
+ */
+ acard_sg[si].addr = cpu_to_le32(addr & 0xffffffff);
+ acard_sg[si].addr_hi = cpu_to_le32((addr >> 16) >> 16);
+ acard_sg[si].flags = 0;
+ acard_sg[si].size = cpu_to_le32(sg_len);
+ last_si = si;
+ }
+
+ acard_sg[last_si].flags |= cpu_to_le32(1 << 31); /* set EOT */
+
+ return si;
+}
+
+static void acard_qc_prep(struct ata_queued_cmd *qc)
+{
+ struct ata_port *ap = qc->ap;
+ struct ahci_port_priv *pp = ap->private_data;
+ int is_atapi = ata_is_atapi(qc->tf.protocol);
+ void *cmd_tbl;
+ u32 opts;
+ const u32 cmd_fis_len = 5; /* five dwords */
+ unsigned int n_elem;
+
+ /*
+ * Fill in command table information. First, the header,
+ * a SATA Register - Host to Device command FIS.
+ */
+ cmd_tbl = pp->cmd_tbl + qc->tag * AHCI_CMD_TBL_SZ;
+
+ ata_tf_to_fis(&qc->tf, qc->dev->link->pmp, 1, cmd_tbl);
+ if (is_atapi) {
+ memset(cmd_tbl + AHCI_CMD_TBL_CDB, 0, 32);
+ memcpy(cmd_tbl + AHCI_CMD_TBL_CDB, qc->cdb, qc->dev->cdb_len);
+ }
+
+ n_elem = 0;
+ if (qc->flags & ATA_QCFLAG_DMAMAP)
+ n_elem = acard_fill_sg(qc, cmd_tbl);
+
+ /*
+ * Fill in command slot information.
+ *
+ * ACard note: prd table length not filled in
+ */
+ opts = cmd_fis_len | (qc->dev->link->pmp << 12);
+ if (qc->tf.flags & ATA_TFLAG_WRITE)
+ opts |= AHCI_CMD_WRITE;
+ if (is_atapi)
+ opts |= AHCI_CMD_ATAPI | AHCI_CMD_PREFETCH;
+
+ ahci_fill_cmd_slot(pp, qc->tag, opts);
+}
+
+static int acard_ahci_init_one(struct pci_dev *pdev, const struct pci_device_id *ent)
+{
+ static int printed_version;
+ unsigned int board_id = ent->driver_data;
+ struct ata_port_info pi = acard_ahci_port_info[board_id];
+ const struct ata_port_info *ppi[] = { &pi, NULL };
+ struct device *dev = &pdev->dev;
+ struct ahci_host_priv *hpriv;
+ struct ata_host *host;
+ int n_ports, i, rc;
+
+ VPRINTK("ENTER\n");
+
+ WARN_ON(ATA_MAX_QUEUE > AHCI_MAX_CMDS);
+
+ if (!printed_version++)
+ dev_printk(KERN_DEBUG, &pdev->dev, "version " DRV_VERSION "\n");
+
+ /* acquire resources */
+ rc = pcim_enable_device(pdev);
+ if (rc)
+ return rc;
+
+ /* AHCI controllers often implement SFF compatible interface.
+ * Grab all PCI BARs just in case.
+ */
+ rc = pcim_iomap_regions_request_all(pdev, 1 << AHCI_PCI_BAR, DRV_NAME);
+ if (rc == -EBUSY)
+ pcim_pin_device(pdev);
+ if (rc)
+ return rc;
+
+ hpriv = devm_kzalloc(dev, sizeof(*hpriv), GFP_KERNEL);
+ if (!hpriv)
+ return -ENOMEM;
+ hpriv->flags |= (unsigned long)pi.private_data;
+
+ if (!(hpriv->flags & AHCI_HFLAG_NO_MSI))
+ pci_enable_msi(pdev);
+
+ /* save initial config */
+ ahci_save_initial_config(pdev, hpriv);
+
+ /* prepare host */
+ if (hpriv->cap & HOST_CAP_NCQ)
+ pi.flags |= ATA_FLAG_NCQ;
+
+ if (hpriv->cap & HOST_CAP_PMP)
+ pi.flags |= ATA_FLAG_PMP;
+
+ if (ahci_em_messages && (hpriv->cap & HOST_CAP_EMS)) {
+ u8 messages;
+ void __iomem *mmio = pcim_iomap_table(pdev)[AHCI_PCI_BAR];
+ u32 em_loc = readl(mmio + HOST_EM_LOC);
+ u32 em_ctl = readl(mmio + HOST_EM_CTL);
+
+ messages = (em_ctl & EM_CTRL_MSG_TYPE) >> 16;
+
+ /* we only support LED message type right now */
+ if ((messages & 0x01) && (ahci_em_messages == 1)) {
+ /* store em_loc */
+ hpriv->em_loc = ((em_loc >> 16) * 4);
+ pi.flags |= ATA_FLAG_EM;
+ if (!(em_ctl & EM_CTL_ALHD))
+ pi.flags |= ATA_FLAG_SW_ACTIVITY;
+ }
+ }
+
+ /* CAP.NP sometimes indicate the index of the last enabled
+ * port, at other times, that of the last possible port, so
+ * determining the maximum port number requires looking at
+ * both CAP.NP and port_map.
+ */
+ n_ports = max(ahci_nr_ports(hpriv->cap), fls(hpriv->port_map));
+
+ host = ata_host_alloc_pinfo(&pdev->dev, ppi, n_ports);
+ if (!host)
+ return -ENOMEM;
+ host->iomap = pcim_iomap_table(pdev);
+ host->private_data = hpriv;
+
+ if (!(hpriv->cap & HOST_CAP_SSS) || ahci_ignore_sss)
+ host->flags |= ATA_HOST_PARALLEL_SCAN;
+ else
+ printk(KERN_INFO "ahci: SSS flag set, parallel bus scan disabled\n");
+
+ if (pi.flags & ATA_FLAG_EM)
+ ahci_reset_em(host);
+
+ for (i = 0; i < host->n_ports; i++) {
+ struct ata_port *ap = host->ports[i];
+
+ ata_port_pbar_desc(ap, AHCI_PCI_BAR, -1, "abar");
+ ata_port_pbar_desc(ap, AHCI_PCI_BAR,
+ 0x100 + ap->port_no * 0x80, "port");
+
+ /* set initial link pm policy */
+ ap->pm_policy = NOT_AVAILABLE;
+
+ /* set enclosure management message type */
+ if (ap->flags & ATA_FLAG_EM)
+ ap->em_message_type = ahci_em_messages;
+
+ /* disabled/not-implemented port */
+ if (!(hpriv->port_map & (1 << i)))
+ ap->ops = &ata_dummy_port_ops;
+ }
+
+ /* initialize adapter */
+ rc = ahci_configure_dma_masks(pdev, hpriv->cap & HOST_CAP_64);
+ if (rc)
+ return rc;
+
+ rc = ahci_reset_controller(host);
+ if (rc)
+ return rc;
+
+ ahci_init_controller(host);
+ ahci_print_info(host);
+
+ pci_set_master(pdev);
+ return ata_host_activate(host, pdev->irq, ahci_interrupt,
+ IRQF_SHARED, &acard_sht);
+}
+
+static struct pci_driver acard_ahci_pci_driver = {
+ .name = DRV_NAME,
+ .id_table = acard_ahci_pci_tbl,
+ .probe = acard_ahci_init_one,
+ .remove = ata_pci_remove_one,
+#ifdef CONFIG_PM
+ .suspend = ahci_pci_device_suspend,
+ .resume = ahci_pci_device_resume,
+#endif
+};
+
+static int __init acard_ahci_init(void)
+{
+ return pci_register_driver(&acard_ahci_pci_driver);
+}
+
+static void __exit acard_ahci_exit(void)
+{
+ pci_unregister_driver(&acard_ahci_pci_driver);
+}
+
+MODULE_AUTHOR("Jeff Garzik");
+MODULE_DESCRIPTION("ACard AHCI SATA low-level driver");
+MODULE_LICENSE("GPL");
+MODULE_DEVICE_TABLE(pci, acard_ahci_pci_tbl);
+MODULE_VERSION(DRV_VERSION);
+
+module_init(acard_ahci_init);
+module_exit(acard_ahci_exit);
diff --git a/drivers/ata/ahci.c b/drivers/ata/ahci.c
index c08c34f..290d06f 100644
--- a/drivers/ata/ahci.c
+++ b/drivers/ata/ahci.c
@@ -97,40 +97,8 @@ static struct scsi_host_template ahci_sht = {
};
static struct ata_port_operations ahci_ops = {
- .inherits = &sata_pmp_port_ops,
-
- .qc_defer = sata_pmp_qc_defer_cmd_switch,
- .qc_prep = ahci_qc_prep,
- .qc_issue = ahci_qc_issue,
- .qc_fill_rtf = ahci_qc_fill_rtf,
-
- .freeze = ahci_freeze,
- .thaw = ahci_thaw,
- .softreset = ahci_softreset,
- .hardreset = ahci_hardreset,
- .postreset = ahci_postreset,
- .pmp_softreset = ahci_softreset,
- .error_handler = ahci_error_handler,
- .post_internal_cmd = ahci_post_internal_cmd,
+ .inherits = &ahci_base_ops,
.dev_config = ahci_dev_config,
-
- .scr_read = ahci_scr_read,
- .scr_write = ahci_scr_write,
- .pmp_attach = ahci_pmp_attach,
- .pmp_detach = ahci_pmp_detach,
-
- .enable_pm = ahci_enable_alpm,
- .disable_pm = ahci_disable_alpm,
- .em_show = ahci_led_show,
- .em_store = ahci_led_store,
- .sw_activity_show = ahci_activity_show,
- .sw_activity_store = ahci_activity_store,
-#ifdef CONFIG_PM
- .port_suspend = ahci_port_suspend,
- .port_resume = ahci_port_resume,
-#endif
- .port_start = ahci_port_start,
- .port_stop = ahci_port_stop,
};
static struct ata_port_operations ahci_vt8251_ops = {
@@ -501,66 +469,6 @@ static int ahci_p5wdh_hardreset(struct ata_link *link, unsigned int *class,
return rc;
}
-static irqreturn_t ahci_interrupt(int irq, void *dev_instance)
-{
- struct ata_host *host = dev_instance;
- struct ahci_host_priv *hpriv;
- unsigned int i, handled = 0;
- void __iomem *mmio;
- u32 irq_stat, irq_masked;
-
- VPRINTK("ENTER\n");
-
- hpriv = host->private_data;
- mmio = host->iomap[AHCI_PCI_BAR];
-
- /* sigh. 0xffffffff is a valid return from h/w */
- irq_stat = readl(mmio + HOST_IRQ_STAT);
- if (!irq_stat)
- return IRQ_NONE;
-
- irq_masked = irq_stat & hpriv->port_map;
-
- spin_lock(&host->lock);
-
- for (i = 0; i < host->n_ports; i++) {
- struct ata_port *ap;
-
- if (!(irq_masked & (1 << i)))
- continue;
-
- ap = host->ports[i];
- if (ap) {
- ahci_port_intr(ap);
- VPRINTK("port %u\n", i);
- } else {
- VPRINTK("port %u (no irq)\n", i);
- if (ata_ratelimit())
- dev_printk(KERN_WARNING, host->dev,
- "interrupt on disabled port %u\n", i);
- }
-
- handled = 1;
- }
-
- /* HOST_IRQ_STAT behaves as level triggered latch meaning that
- * it should be cleared after all the port events are cleared;
- * otherwise, it will raise a spurious interrupt after each
- * valid one. Please read section 10.6.2 of ahci 1.1 for more
- * information.
- *
- * Also, use the unmasked value to clear interrupt as spurious
- * pending event on a dummy port might cause screaming IRQ.
- */
- writel(irq_stat, mmio + HOST_IRQ_STAT);
-
- spin_unlock(&host->lock);
-
- VPRINTK("EXIT\n");
-
- return IRQ_RETVAL(handled);
-}
-
/* On ASUS P5W DH Deluxe, the second port of PCI device 00:1f.2 is
* hardwired to on-board SIMG 4726. The chipset is ICH8 and doesn't
* support PMP and the 4726 either directly exports the device
diff --git a/drivers/ata/ahci.h b/drivers/ata/ahci.h
index 6d3f1ad..3b1431e 100644
--- a/drivers/ata/ahci.h
+++ b/drivers/ata/ahci.h
@@ -236,6 +236,8 @@ static inline int ahci_nr_ports(u32 cap)
return (cap & 0x1f) + 1;
}
+extern struct ata_port_operations ahci_base_ops;
+
extern void ahci_postreset(struct ata_link *link, unsigned int *class);
extern void ahci_qc_prep(struct ata_queued_cmd *qc);
extern void ahci_freeze(struct ata_port *ap);
@@ -276,6 +278,7 @@ extern ssize_t ahci_activity_store(struct ata_device *dev, enum sw_activity val)
extern ssize_t ahci_activity_show(struct ata_device *dev, char *buf);
extern void ahci_print_info(struct ata_host *host);
extern void ahci_port_intr(struct ata_port *ap);
+extern irqreturn_t ahci_interrupt(int irq, void *dev_instance);
extern void ahci_fill_cmd_slot(struct ahci_port_priv *pp, unsigned int tag, u32 opts);
extern unsigned int ahci_fill_sg(struct ata_queued_cmd *qc, void *cmd_tbl);
extern int ahci_deinit_port(struct ata_port *ap, const char **emsg);
diff --git a/drivers/ata/libahci.c b/drivers/ata/libahci.c
index 6db204c..24bd11b 100644
--- a/drivers/ata/libahci.c
+++ b/drivers/ata/libahci.c
@@ -1705,3 +1705,101 @@ void ahci_port_intr(struct ata_port *ap)
}
EXPORT_SYMBOL_GPL(ahci_port_intr);
+irqreturn_t ahci_interrupt(int irq, void *dev_instance)
+{
+ struct ata_host *host = dev_instance;
+ struct ahci_host_priv *hpriv;
+ unsigned int i, handled = 0;
+ void __iomem *mmio;
+ u32 irq_stat, irq_masked;
+
+ VPRINTK("ENTER\n");
+
+ hpriv = host->private_data;
+ mmio = host->iomap[AHCI_PCI_BAR];
+
+ /* sigh. 0xffffffff is a valid return from h/w */
+ irq_stat = readl(mmio + HOST_IRQ_STAT);
+ if (!irq_stat)
+ return IRQ_NONE;
+
+ irq_masked = irq_stat & hpriv->port_map;
+
+ spin_lock(&host->lock);
+
+ for (i = 0; i < host->n_ports; i++) {
+ struct ata_port *ap;
+
+ if (!(irq_masked & (1 << i)))
+ continue;
+
+ ap = host->ports[i];
+ if (ap) {
+ ahci_port_intr(ap);
+ VPRINTK("port %u\n", i);
+ } else {
+ VPRINTK("port %u (no irq)\n", i);
+ if (ata_ratelimit())
+ dev_printk(KERN_WARNING, host->dev,
+ "interrupt on disabled port %u\n", i);
+ }
+
+ handled = 1;
+ }
+
+ /* HOST_IRQ_STAT behaves as level triggered latch meaning that
+ * it should be cleared after all the port events are cleared;
+ * otherwise, it will raise a spurious interrupt after each
+ * valid one. Please read section 10.6.2 of ahci 1.1 for more
+ * information.
+ *
+ * Also, use the unmasked value to clear interrupt as spurious
+ * pending event on a dummy port might cause screaming IRQ.
+ */
+ writel(irq_stat, mmio + HOST_IRQ_STAT);
+
+ spin_unlock(&host->lock);
+
+ VPRINTK("EXIT\n");
+
+ return IRQ_RETVAL(handled);
+}
+EXPORT_SYMBOL_GPL(ahci_interrupt);
+
+struct ata_port_operations ahci_base_ops = {
+ .inherits = &sata_pmp_port_ops,
+
+ .qc_defer = sata_pmp_qc_defer_cmd_switch,
+ .qc_prep = ahci_qc_prep,
+ .qc_issue = ahci_qc_issue,
+ .qc_fill_rtf = ahci_qc_fill_rtf,
+
+ .freeze = ahci_freeze,
+ .thaw = ahci_thaw,
+ .softreset = ahci_softreset,
+ .hardreset = ahci_hardreset,
+ .postreset = ahci_postreset,
+ .pmp_softreset = ahci_softreset,
+ .error_handler = ahci_error_handler,
+ .post_internal_cmd = ahci_post_internal_cmd,
+
+ .scr_read = ahci_scr_read,
+ .scr_write = ahci_scr_write,
+ .pmp_attach = ahci_pmp_attach,
+ .pmp_detach = ahci_pmp_detach,
+
+ .enable_pm = ahci_enable_alpm,
+ .disable_pm = ahci_disable_alpm,
+ .em_show = ahci_led_show,
+ .em_store = ahci_led_store,
+ .sw_activity_show = ahci_activity_show,
+ .sw_activity_store = ahci_activity_store,
+#ifdef CONFIG_PM
+ .port_suspend = ahci_port_suspend,
+ .port_resume = ahci_port_resume,
+#endif
+ .port_start = ahci_port_start,
+ .port_stop = ahci_port_stop,
+};
+EXPORT_SYMBOL_GPL(ahci_base_ops);
+
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