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![Rafael J. Wysocki](/assets/img/avatar_default.png)
Since drivers/ide/ide-acpi.c is the only remaining user of acpi_get_child(), move that function into that file as a static routine. Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
621 lines
16 KiB
C
621 lines
16 KiB
C
/*
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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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#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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#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 uninitialized_var(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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/**
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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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/* 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;
|
|
in_params[0].type = ACPI_TYPE_BUFFER;
|
|
in_params[0].buffer.length = sizeof(struct GTM_buffer);
|
|
in_params[0].buffer.pointer = (u8 *)&hwif->acpidata->gtm;
|
|
in_params[1].type = ACPI_TYPE_BUFFER;
|
|
in_params[1].buffer.length = ATA_ID_WORDS * 2;
|
|
in_params[1].buffer.pointer = (u8 *)&master->idbuff;
|
|
in_params[2].type = ACPI_TYPE_BUFFER;
|
|
in_params[2].buffer.length = ATA_ID_WORDS * 2;
|
|
in_params[2].buffer.pointer = (u8 *)&slave->idbuff;
|
|
/* Output buffer: _STM has no output */
|
|
|
|
status = acpi_evaluate_object(hwif->acpidata->obj_handle, "_STM",
|
|
&input, NULL);
|
|
|
|
if (ACPI_FAILURE(status)) {
|
|
DEBPRINT("Run _STM error: status = 0x%x\n", status);
|
|
}
|
|
DEBPRINT("_STM status: %d\n", status);
|
|
}
|
|
|
|
/**
|
|
* ide_acpi_set_state - set the channel power state
|
|
* @hwif: target IDE interface
|
|
* @on: state, on/off
|
|
*
|
|
* This function executes the _PS0/_PS3 ACPI method to set the power state.
|
|
* ACPI spec requires _PS0 when IDE power on and _PS3 when power off
|
|
*/
|
|
void ide_acpi_set_state(ide_hwif_t *hwif, int on)
|
|
{
|
|
ide_drive_t *drive;
|
|
int i;
|
|
|
|
if (ide_noacpi_psx)
|
|
return;
|
|
|
|
DEBPRINT("ENTER:\n");
|
|
|
|
/* channel first and then drives for power on and verse versa for power off */
|
|
if (on)
|
|
acpi_bus_set_power(hwif->acpidata->obj_handle, ACPI_STATE_D0);
|
|
|
|
ide_port_for_each_present_dev(i, drive, hwif) {
|
|
if (drive->acpidata->obj_handle)
|
|
acpi_bus_set_power(drive->acpidata->obj_handle,
|
|
on ? ACPI_STATE_D0 : ACPI_STATE_D3_COLD);
|
|
}
|
|
|
|
if (!on)
|
|
acpi_bus_set_power(hwif->acpidata->obj_handle,
|
|
ACPI_STATE_D3_COLD);
|
|
}
|
|
|
|
/**
|
|
* ide_acpi_init_port - initialize the ACPI link for an IDE interface
|
|
* @hwif: target IDE interface (channel)
|
|
*
|
|
* 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);
|
|
}
|
|
}
|