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622 lines
16 KiB
622 lines
16 KiB
// SPDX-License-Identifier: GPL-2.0 |
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/* |
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* Provides ACPI support for IDE drives. |
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* |
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* Copyright (C) 2005 Intel Corp. |
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* Copyright (C) 2005 Randy Dunlap |
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* Copyright (C) 2006 SUSE Linux Products GmbH |
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* Copyright (C) 2006 Hannes Reinecke |
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*/ |
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|
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#include <linux/acpi.h> |
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#include <linux/ata.h> |
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#include <linux/delay.h> |
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#include <linux/device.h> |
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#include <linux/errno.h> |
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#include <linux/kernel.h> |
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#include <linux/slab.h> |
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#include <linux/ide.h> |
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#include <linux/pci.h> |
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#include <linux/dmi.h> |
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#include <linux/module.h> |
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#define REGS_PER_GTF 7 |
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struct GTM_buffer { |
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u32 PIO_speed0; |
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u32 DMA_speed0; |
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u32 PIO_speed1; |
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u32 DMA_speed1; |
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u32 GTM_flags; |
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}; |
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struct ide_acpi_drive_link { |
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acpi_handle obj_handle; |
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u8 idbuff[512]; |
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}; |
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struct ide_acpi_hwif_link { |
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ide_hwif_t *hwif; |
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acpi_handle obj_handle; |
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struct GTM_buffer gtm; |
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struct ide_acpi_drive_link master; |
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struct ide_acpi_drive_link slave; |
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}; |
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|
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#undef DEBUGGING |
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/* note: adds function name and KERN_DEBUG */ |
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#ifdef DEBUGGING |
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#define DEBPRINT(fmt, args...) \ |
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printk(KERN_DEBUG "%s: " fmt, __func__, ## args) |
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#else |
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#define DEBPRINT(fmt, args...) do {} while (0) |
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#endif /* DEBUGGING */ |
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static bool ide_noacpi; |
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module_param_named(noacpi, ide_noacpi, bool, 0); |
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MODULE_PARM_DESC(noacpi, "disable IDE ACPI support"); |
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static bool ide_acpigtf; |
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module_param_named(acpigtf, ide_acpigtf, bool, 0); |
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MODULE_PARM_DESC(acpigtf, "enable IDE ACPI _GTF support"); |
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static bool ide_acpionboot; |
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module_param_named(acpionboot, ide_acpionboot, bool, 0); |
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MODULE_PARM_DESC(acpionboot, "call IDE ACPI methods on boot"); |
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static bool ide_noacpi_psx; |
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static int no_acpi_psx(const struct dmi_system_id *id) |
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{ |
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ide_noacpi_psx = true; |
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printk(KERN_NOTICE"%s detected - disable ACPI _PSx.\n", id->ident); |
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return 0; |
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} |
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static const struct dmi_system_id ide_acpi_dmi_table[] = { |
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/* Bug 9673. */ |
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/* We should check if this is because ACPI NVS isn't save/restored. */ |
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{ |
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.callback = no_acpi_psx, |
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.ident = "HP nx9005", |
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.matches = { |
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DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies Ltd."), |
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DMI_MATCH(DMI_BIOS_VERSION, "KAM1.60") |
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}, |
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}, |
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{ } /* terminate list */ |
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}; |
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int ide_acpi_init(void) |
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{ |
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dmi_check_system(ide_acpi_dmi_table); |
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return 0; |
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} |
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bool ide_port_acpi(ide_hwif_t *hwif) |
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{ |
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return ide_noacpi == 0 && hwif->acpidata; |
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} |
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static acpi_handle acpi_get_child(acpi_handle handle, u64 addr) |
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{ |
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struct acpi_device *adev; |
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if (!handle || acpi_bus_get_device(handle, &adev)) |
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return NULL; |
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adev = acpi_find_child_device(adev, addr, false); |
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return adev ? adev->handle : NULL; |
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} |
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/** |
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* ide_get_dev_handle - finds acpi_handle and PCI device.function |
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* @dev: device to locate |
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* @handle: returned acpi_handle for @dev |
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* @pcidevfn: return PCI device.func for @dev |
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* |
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* Returns the ACPI object handle to the corresponding PCI device. |
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* |
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* Returns 0 on success, <0 on error. |
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*/ |
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static int ide_get_dev_handle(struct device *dev, acpi_handle *handle, |
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u64 *pcidevfn) |
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{ |
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struct pci_dev *pdev = to_pci_dev(dev); |
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unsigned int bus, devnum, func; |
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u64 addr; |
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acpi_handle dev_handle; |
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acpi_status status; |
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struct acpi_device_info *dinfo = NULL; |
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int ret = -ENODEV; |
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bus = pdev->bus->number; |
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devnum = PCI_SLOT(pdev->devfn); |
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func = PCI_FUNC(pdev->devfn); |
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/* ACPI _ADR encoding for PCI bus: */ |
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addr = (u64)(devnum << 16 | func); |
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DEBPRINT("ENTER: pci %02x:%02x.%01x\n", bus, devnum, func); |
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dev_handle = ACPI_HANDLE(dev); |
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if (!dev_handle) { |
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DEBPRINT("no acpi handle for device\n"); |
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goto err; |
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} |
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status = acpi_get_object_info(dev_handle, &dinfo); |
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if (ACPI_FAILURE(status)) { |
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DEBPRINT("get_object_info for device failed\n"); |
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goto err; |
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} |
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if (dinfo && (dinfo->valid & ACPI_VALID_ADR) && |
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dinfo->address == addr) { |
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*pcidevfn = addr; |
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*handle = dev_handle; |
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} else { |
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DEBPRINT("get_object_info for device has wrong " |
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" address: %llu, should be %u\n", |
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dinfo ? (unsigned long long)dinfo->address : -1ULL, |
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(unsigned int)addr); |
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goto err; |
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} |
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DEBPRINT("for dev=0x%x.%x, addr=0x%llx, *handle=0x%p\n", |
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devnum, func, (unsigned long long)addr, *handle); |
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ret = 0; |
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err: |
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kfree(dinfo); |
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return ret; |
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} |
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/** |
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* ide_acpi_hwif_get_handle - Get ACPI object handle for a given hwif |
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* @hwif: device to locate |
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* |
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* Retrieves the object handle for a given hwif. |
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* |
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* Returns handle on success, 0 on error. |
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*/ |
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static acpi_handle ide_acpi_hwif_get_handle(ide_hwif_t *hwif) |
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{ |
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struct device *dev = hwif->gendev.parent; |
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acpi_handle dev_handle; |
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u64 pcidevfn; |
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acpi_handle chan_handle; |
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int err; |
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DEBPRINT("ENTER: device %s\n", hwif->name); |
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if (!dev) { |
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DEBPRINT("no PCI device for %s\n", hwif->name); |
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return NULL; |
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} |
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err = ide_get_dev_handle(dev, &dev_handle, &pcidevfn); |
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if (err < 0) { |
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DEBPRINT("ide_get_dev_handle failed (%d)\n", err); |
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return NULL; |
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} |
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/* get child objects of dev_handle == channel objects, |
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* + _their_ children == drive objects */ |
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/* channel is hwif->channel */ |
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chan_handle = acpi_get_child(dev_handle, hwif->channel); |
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DEBPRINT("chan adr=%d: handle=0x%p\n", |
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hwif->channel, chan_handle); |
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return chan_handle; |
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} |
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/** |
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* do_drive_get_GTF - get the drive bootup default taskfile settings |
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* @drive: the drive for which the taskfile settings should be retrieved |
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* @gtf_length: number of bytes of _GTF data returned at @gtf_address |
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* @gtf_address: buffer containing _GTF taskfile arrays |
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* |
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* The _GTF method has no input parameters. |
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* It returns a variable number of register set values (registers |
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* hex 1F1..1F7, taskfiles). |
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* The <variable number> is not known in advance, so have ACPI-CA |
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* allocate the buffer as needed and return it, then free it later. |
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* |
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* The returned @gtf_length and @gtf_address are only valid if the |
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* function return value is 0. |
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*/ |
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static int do_drive_get_GTF(ide_drive_t *drive, |
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unsigned int *gtf_length, unsigned long *gtf_address, |
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unsigned long *obj_loc) |
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{ |
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acpi_status status; |
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struct acpi_buffer output; |
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union acpi_object *out_obj; |
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int err = -ENODEV; |
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*gtf_length = 0; |
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*gtf_address = 0UL; |
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*obj_loc = 0UL; |
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if (!drive->acpidata->obj_handle) { |
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DEBPRINT("No ACPI object found for %s\n", drive->name); |
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goto out; |
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} |
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/* Setting up output buffer */ |
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output.length = ACPI_ALLOCATE_BUFFER; |
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output.pointer = NULL; /* ACPI-CA sets this; save/free it later */ |
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/* _GTF has no input parameters */ |
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err = -EIO; |
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status = acpi_evaluate_object(drive->acpidata->obj_handle, "_GTF", |
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NULL, &output); |
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if (ACPI_FAILURE(status)) { |
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printk(KERN_DEBUG |
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"%s: Run _GTF error: status = 0x%x\n", |
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__func__, status); |
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goto out; |
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} |
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if (!output.length || !output.pointer) { |
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DEBPRINT("Run _GTF: " |
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"length or ptr is NULL (0x%llx, 0x%p)\n", |
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(unsigned long long)output.length, |
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output.pointer); |
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goto out; |
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} |
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out_obj = output.pointer; |
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if (out_obj->type != ACPI_TYPE_BUFFER) { |
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DEBPRINT("Run _GTF: error: " |
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"expected object type of ACPI_TYPE_BUFFER, " |
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"got 0x%x\n", out_obj->type); |
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err = -ENOENT; |
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kfree(output.pointer); |
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goto out; |
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} |
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if (!out_obj->buffer.length || !out_obj->buffer.pointer || |
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out_obj->buffer.length % REGS_PER_GTF) { |
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printk(KERN_ERR |
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"%s: unexpected GTF length (%d) or addr (0x%p)\n", |
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__func__, out_obj->buffer.length, |
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out_obj->buffer.pointer); |
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err = -ENOENT; |
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kfree(output.pointer); |
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goto out; |
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} |
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*gtf_length = out_obj->buffer.length; |
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*gtf_address = (unsigned long)out_obj->buffer.pointer; |
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*obj_loc = (unsigned long)out_obj; |
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DEBPRINT("returning gtf_length=%d, gtf_address=0x%lx, obj_loc=0x%lx\n", |
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*gtf_length, *gtf_address, *obj_loc); |
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err = 0; |
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out: |
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return err; |
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} |
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/** |
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* do_drive_set_taskfiles - write the drive taskfile settings from _GTF |
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* @drive: the drive to which the taskfile command should be sent |
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* @gtf_length: total number of bytes of _GTF taskfiles |
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* @gtf_address: location of _GTF taskfile arrays |
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* |
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* Write {gtf_address, length gtf_length} in groups of |
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* REGS_PER_GTF bytes. |
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*/ |
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static int do_drive_set_taskfiles(ide_drive_t *drive, |
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unsigned int gtf_length, |
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unsigned long gtf_address) |
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{ |
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int rc = 0, err; |
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int gtf_count = gtf_length / REGS_PER_GTF; |
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int ix; |
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DEBPRINT("total GTF bytes=%u (0x%x), gtf_count=%d, addr=0x%lx\n", |
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gtf_length, gtf_length, gtf_count, gtf_address); |
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/* send all taskfile registers (0x1f1-0x1f7) *in*that*order* */ |
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for (ix = 0; ix < gtf_count; ix++) { |
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u8 *gtf = (u8 *)(gtf_address + ix * REGS_PER_GTF); |
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struct ide_cmd cmd; |
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DEBPRINT("(0x1f1-1f7): " |
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"hex: %02x %02x %02x %02x %02x %02x %02x\n", |
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gtf[0], gtf[1], gtf[2], |
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gtf[3], gtf[4], gtf[5], gtf[6]); |
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if (!ide_acpigtf) { |
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DEBPRINT("_GTF execution disabled\n"); |
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continue; |
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} |
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/* convert GTF to taskfile */ |
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memset(&cmd, 0, sizeof(cmd)); |
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memcpy(&cmd.tf.feature, gtf, REGS_PER_GTF); |
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cmd.valid.out.tf = IDE_VALID_OUT_TF | IDE_VALID_DEVICE; |
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cmd.valid.in.tf = IDE_VALID_IN_TF | IDE_VALID_DEVICE; |
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err = ide_no_data_taskfile(drive, &cmd); |
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if (err) { |
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printk(KERN_ERR "%s: ide_no_data_taskfile failed: %u\n", |
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__func__, err); |
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rc = err; |
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} |
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} |
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return rc; |
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} |
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/** |
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* ide_acpi_exec_tfs - get then write drive taskfile settings |
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* @drive: the drive for which the taskfile settings should be |
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* written. |
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* |
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* According to the ACPI spec this should be called after _STM |
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* has been evaluated for the interface. Some ACPI vendors interpret |
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* that as a hard requirement and modify the taskfile according |
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* to the Identify Drive information passed down with _STM. |
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* So one should really make sure to call this only after _STM has |
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* been executed. |
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*/ |
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int ide_acpi_exec_tfs(ide_drive_t *drive) |
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{ |
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int ret; |
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unsigned int gtf_length; |
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unsigned long gtf_address; |
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unsigned long obj_loc; |
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DEBPRINT("call get_GTF, drive=%s port=%d\n", drive->name, drive->dn); |
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ret = do_drive_get_GTF(drive, >f_length, >f_address, &obj_loc); |
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if (ret < 0) { |
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DEBPRINT("get_GTF error (%d)\n", ret); |
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return ret; |
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} |
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DEBPRINT("call set_taskfiles, drive=%s\n", drive->name); |
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ret = do_drive_set_taskfiles(drive, gtf_length, gtf_address); |
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kfree((void *)obj_loc); |
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if (ret < 0) { |
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DEBPRINT("set_taskfiles error (%d)\n", ret); |
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} |
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DEBPRINT("ret=%d\n", ret); |
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return ret; |
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} |
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/** |
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* ide_acpi_get_timing - get the channel (controller) timings |
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* @hwif: target IDE interface (channel) |
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* |
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* This function executes the _GTM ACPI method for the target channel. |
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* |
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*/ |
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void ide_acpi_get_timing(ide_hwif_t *hwif) |
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{ |
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acpi_status status; |
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struct acpi_buffer output; |
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union acpi_object *out_obj; |
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/* Setting up output buffer for _GTM */ |
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output.length = ACPI_ALLOCATE_BUFFER; |
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output.pointer = NULL; /* ACPI-CA sets this; save/free it later */ |
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/* _GTM has no input parameters */ |
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status = acpi_evaluate_object(hwif->acpidata->obj_handle, "_GTM", |
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NULL, &output); |
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DEBPRINT("_GTM status: %d, outptr: 0x%p, outlen: 0x%llx\n", |
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status, output.pointer, |
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(unsigned long long)output.length); |
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if (ACPI_FAILURE(status)) { |
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DEBPRINT("Run _GTM error: status = 0x%x\n", status); |
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return; |
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} |
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if (!output.length || !output.pointer) { |
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DEBPRINT("Run _GTM: length or ptr is NULL (0x%llx, 0x%p)\n", |
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(unsigned long long)output.length, |
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output.pointer); |
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kfree(output.pointer); |
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return; |
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} |
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out_obj = output.pointer; |
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if (out_obj->type != ACPI_TYPE_BUFFER) { |
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DEBPRINT("Run _GTM: error: " |
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"expected object type of ACPI_TYPE_BUFFER, " |
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"got 0x%x\n", out_obj->type); |
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kfree(output.pointer); |
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return; |
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} |
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if (!out_obj->buffer.length || !out_obj->buffer.pointer || |
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out_obj->buffer.length != sizeof(struct GTM_buffer)) { |
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printk(KERN_ERR |
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"%s: unexpected _GTM length (0x%x)[should be 0x%zx] or " |
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"addr (0x%p)\n", |
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__func__, out_obj->buffer.length, |
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sizeof(struct GTM_buffer), out_obj->buffer.pointer); |
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kfree(output.pointer); |
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return; |
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} |
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memcpy(&hwif->acpidata->gtm, out_obj->buffer.pointer, |
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sizeof(struct GTM_buffer)); |
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DEBPRINT("_GTM info: ptr: 0x%p, len: 0x%x, exp.len: 0x%zx\n", |
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out_obj->buffer.pointer, out_obj->buffer.length, |
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sizeof(struct GTM_buffer)); |
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DEBPRINT("_GTM fields: 0x%x, 0x%x, 0x%x, 0x%x, 0x%x\n", |
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hwif->acpidata->gtm.PIO_speed0, |
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hwif->acpidata->gtm.DMA_speed0, |
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hwif->acpidata->gtm.PIO_speed1, |
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hwif->acpidata->gtm.DMA_speed1, |
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hwif->acpidata->gtm.GTM_flags); |
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kfree(output.pointer); |
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} |
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/** |
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* ide_acpi_push_timing - set the channel (controller) timings |
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* @hwif: target IDE interface (channel) |
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* |
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* This function executes the _STM ACPI method for the target channel. |
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* |
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* _STM requires Identify Drive data, which has to passed as an argument. |
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* Unfortunately drive->id is a mangled version which we can't readily |
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* use; hence we'll get the information afresh. |
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*/ |
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void ide_acpi_push_timing(ide_hwif_t *hwif) |
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{ |
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acpi_status status; |
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struct acpi_object_list input; |
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union acpi_object in_params[3]; |
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struct ide_acpi_drive_link *master = &hwif->acpidata->master; |
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struct ide_acpi_drive_link *slave = &hwif->acpidata->slave; |
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|
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/* Give the GTM buffer + drive Identify data to the channel via the |
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* _STM method: */ |
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/* setup input parameters buffer for _STM */ |
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input.count = 3; |
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input.pointer = in_params; |
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in_params[0].type = ACPI_TYPE_BUFFER; |
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in_params[0].buffer.length = sizeof(struct GTM_buffer); |
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in_params[0].buffer.pointer = (u8 *)&hwif->acpidata->gtm; |
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in_params[1].type = ACPI_TYPE_BUFFER; |
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in_params[1].buffer.length = ATA_ID_WORDS * 2; |
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in_params[1].buffer.pointer = (u8 *)&master->idbuff; |
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in_params[2].type = ACPI_TYPE_BUFFER; |
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in_params[2].buffer.length = ATA_ID_WORDS * 2; |
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in_params[2].buffer.pointer = (u8 *)&slave->idbuff; |
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/* Output buffer: _STM has no output */ |
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status = acpi_evaluate_object(hwif->acpidata->obj_handle, "_STM", |
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&input, NULL); |
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if (ACPI_FAILURE(status)) { |
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DEBPRINT("Run _STM error: status = 0x%x\n", status); |
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} |
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DEBPRINT("_STM status: %d\n", status); |
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} |
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/** |
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* ide_acpi_set_state - set the channel power state |
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* @hwif: target IDE interface |
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* @on: state, on/off |
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* |
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* This function executes the _PS0/_PS3 ACPI method to set the power state. |
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* ACPI spec requires _PS0 when IDE power on and _PS3 when power off |
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*/ |
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void ide_acpi_set_state(ide_hwif_t *hwif, int on) |
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{ |
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ide_drive_t *drive; |
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int i; |
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|
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if (ide_noacpi_psx) |
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return; |
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DEBPRINT("ENTER:\n"); |
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|
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/* channel first and then drives for power on and verse versa for power off */ |
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if (on) |
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acpi_bus_set_power(hwif->acpidata->obj_handle, ACPI_STATE_D0); |
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|
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ide_port_for_each_present_dev(i, drive, hwif) { |
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if (drive->acpidata->obj_handle) |
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acpi_bus_set_power(drive->acpidata->obj_handle, |
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on ? ACPI_STATE_D0 : ACPI_STATE_D3_COLD); |
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} |
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|
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if (!on) |
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acpi_bus_set_power(hwif->acpidata->obj_handle, |
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ACPI_STATE_D3_COLD); |
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} |
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|
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/** |
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* ide_acpi_init_port - initialize the ACPI link for an IDE interface |
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* @hwif: target IDE interface (channel) |
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* |
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* The ACPI spec is not quite clear when the drive identify buffer |
|
* should be obtained. Calling IDENTIFY DEVICE during shutdown |
|
* is not the best of ideas as the drive might already being put to |
|
* sleep. And obviously we can't call it during resume. |
|
* So we get the information during startup; but this means that |
|
* any changes during run-time will be lost after resume. |
|
*/ |
|
void ide_acpi_init_port(ide_hwif_t *hwif) |
|
{ |
|
hwif->acpidata = kzalloc(sizeof(struct ide_acpi_hwif_link), GFP_KERNEL); |
|
if (!hwif->acpidata) |
|
return; |
|
|
|
hwif->acpidata->obj_handle = ide_acpi_hwif_get_handle(hwif); |
|
if (!hwif->acpidata->obj_handle) { |
|
DEBPRINT("no ACPI object for %s found\n", hwif->name); |
|
kfree(hwif->acpidata); |
|
hwif->acpidata = NULL; |
|
} |
|
} |
|
|
|
void ide_acpi_port_init_devices(ide_hwif_t *hwif) |
|
{ |
|
ide_drive_t *drive; |
|
int i, err; |
|
|
|
if (hwif->acpidata == NULL) |
|
return; |
|
|
|
/* |
|
* The ACPI spec mandates that we send information |
|
* for both drives, regardless whether they are connected |
|
* or not. |
|
*/ |
|
hwif->devices[0]->acpidata = &hwif->acpidata->master; |
|
hwif->devices[1]->acpidata = &hwif->acpidata->slave; |
|
|
|
/* get _ADR info for each device */ |
|
ide_port_for_each_present_dev(i, drive, hwif) { |
|
acpi_handle dev_handle; |
|
|
|
DEBPRINT("ENTER: %s at channel#: %d port#: %d\n", |
|
drive->name, hwif->channel, drive->dn & 1); |
|
|
|
/* TBD: could also check ACPI object VALID bits */ |
|
dev_handle = acpi_get_child(hwif->acpidata->obj_handle, |
|
drive->dn & 1); |
|
|
|
DEBPRINT("drive %s handle 0x%p\n", drive->name, dev_handle); |
|
|
|
drive->acpidata->obj_handle = dev_handle; |
|
} |
|
|
|
/* send IDENTIFY for each device */ |
|
ide_port_for_each_present_dev(i, drive, hwif) { |
|
err = taskfile_lib_get_identify(drive, drive->acpidata->idbuff); |
|
if (err) |
|
DEBPRINT("identify device %s failed (%d)\n", |
|
drive->name, err); |
|
} |
|
|
|
if (ide_noacpi || ide_acpionboot == 0) { |
|
DEBPRINT("ACPI methods disabled on boot\n"); |
|
return; |
|
} |
|
|
|
/* ACPI _PS0 before _STM */ |
|
ide_acpi_set_state(hwif, 1); |
|
/* |
|
* ACPI requires us to call _STM on startup |
|
*/ |
|
ide_acpi_get_timing(hwif); |
|
ide_acpi_push_timing(hwif); |
|
|
|
ide_port_for_each_present_dev(i, drive, hwif) { |
|
ide_acpi_exec_tfs(drive); |
|
} |
|
}
|
|
|