From: Alan Cox <alan@xxxxxxxxxx>
Signed-off-by: Alan Cox <alan@xxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
drivers/ata/libata-acpi.c | 87 +++++++++++++++++++++++++++++++++++-
drivers/ata/libata-acpi.h | 47 +++++++++++++++++++
2 files changed, 133 insertions(+), 1 deletion(-)
diff -puN drivers/ata/libata-acpi.c~libata-acpi-add-infrastructure-for-drivers-to-use drivers/ata/libata-acpi.c
--- a/drivers/ata/libata-acpi.c~libata-acpi-add-infrastructure-for-drivers-to-use
+++ a/drivers/ata/libata-acpi.c
@@ -15,7 +15,7 @@
#include <linux/libata.h>
#include <linux/pci.h>
#include "libata.h"
-
+#include "libata-acpi.h"
#include <acpi/acpi_bus.h>
#include <acpi/acnames.h>
#include <acpi/acnamesp.h>
@@ -706,3 +706,88 @@ out:
}
+int ata_acpi_gtm(const struct ata_port *ap, void *handle, struct acpi_gtm *gtm)
+{
+ acpi_status status;
+ struct acpi_buffer output;
+
+ output.length = ACPI_ALLOCATE_BUFFER;
+ output.pointer = NULL;
+
+ status = acpi_evaluate_object(handle, "_GTM", NULL, &output);
+
+ if (ACPI_FAILURE(status)) {
+ ata_port_printk(ap, KERN_ERR, "ACPI get timing mode failed.\n");
+ return -EINVAL;
+ }
+ if (output.length < sizeof(struct acpi_gtm) || output.pointer == NULL) {
+ ata_port_printk(ap, KERN_ERR, "ACPI get timing provided invalid data.\n");
+ return -EINVAL;
+ }
+ memcpy(gtm, output.pointer, sizeof(struct acpi_gtm));
+ kfree(output.pointer);
+ return 0;
+}
+
+int ata_acpi_stm(const struct ata_port *ap, void *handle, struct acpi_gtm *stm)
+{
+ acpi_status status;
+ struct acpi_object_list input;
+ union acpi_object in_params[3];
+
+ in_params[0].type = ACPI_TYPE_BUFFER;
+ in_params[0].buffer.length = sizeof(struct acpi_gtm);
+ in_params[0].buffer.pointer = (u8 *)stm;
+ /* Buffers for id may need byteswapping ? */
+ in_params[1].type = ACPI_TYPE_BUFFER;
+ in_params[1].buffer.length = 512;
+ in_params[1].buffer.pointer = (u8 *)ap->device[0].id;
+ in_params[2].type = ACPI_TYPE_BUFFER;
+ in_params[2].buffer.length = 512;
+ in_params[2].buffer.pointer = (u8 *)ap->device[1].id;
+
+ input.count = 3;
+ input.pointer = in_params;
+
+ status = acpi_evaluate_object(handle, "_STM", &input, NULL);
+
+ if (ACPI_FAILURE(status)) {
+ ata_port_printk(ap, KERN_ERR, "ACPI set timing mode failed.\n");
+ return -EINVAL;
+ }
+ return 0;
+}
+
+static void *ata_pata_find_handle(struct device *dev, int port)
+{
+ acpi_handle handle;
+ acpi_integer devfn;
+
+ if (libata_noacpi)
+ return NULL;
+ if (pata_get_dev_handle(dev, &handle, &devfn) < 0)
+ return NULL;
+ return acpi_get_child(handle, port);
+}
+
+void *ata_pata_acpi_handle(const struct ata_port *ap)
+{
+ return ata_pata_find_handle(ap->host->dev, ap->port_no);
+}
+
+int ata_pata_acpi_present(struct pci_dev *pdev)
+{
+ int present = 0;
+
+ if(ata_pata_find_handle(&pdev->dev, 0))
+ present |= 1;
+ if(ata_pata_find_handle(&pdev->dev, 1))
+ present |= 2;
+ return present;
+}
+
+
+EXPORT_SYMBOL_GPL(ata_acpi_gtm);
+EXPORT_SYMBOL_GPL(ata_acpi_stm);
+EXPORT_SYMBOL_GPL(ata_pata_acpi_handle);
+EXPORT_SYMBOL_GPL(ata_pata_acpi_present);
diff -puN /dev/null drivers/ata/libata-acpi.h
--- /dev/null
+++ a/drivers/ata/libata-acpi.h
@@ -0,0 +1,47 @@
+/*
+ * libata-acpi.h - helper library for ATA ACPI drivers
+ *
+ * Copyright 2007 Red Hat, Inc. All rights reserved.
+ * Copyright 2007 Alan Cox
+ *
+ *
+ * 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.*
+ *
+ */
+
+#ifndef __LIBATA_ACPI_H__
+#define __LIBATA_ACPI_H__
+
+struct acpi_drive
+{
+ u32 pio;
+ u32 dma;
+};
+
+struct acpi_gtm {
+ struct acpi_drive drive[2];
+ u32 flags;
+};
+
+extern int ata_acpi_gtm(const struct ata_port *p, void *handle, struct acpi_gtm *gtm);
+extern int ata_acpi_stm(const struct ata_port *ap, void *handle, struct acpi_gtm *stm);
+extern void *ata_pata_acpi_handle(const struct ata_port *ap);
+extern int ata_pata_acpi_present(struct pci_dev *pdev);
+
+#endif
_
-
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