/* * Provides ACPI support for IDE drives. * * Copyright (C) 2005 Intel Corp. * Copyright (C) 2005 Randy Dunlap * Copyright (C) 2006 SUSE Linux Products GmbH * Copyright (C) 2006 Hannes Reinecke */ #include <linux/ata.h> #include <linux/delay.h> #include <linux/device.h> #include <linux/errno.h> #include <linux/kernel.h> #include <acpi/acpi.h> #include <linux/ide.h> #include <linux/pci.h> #include <linux/dmi.h> #include <acpi/acpi_bus.h> #define REGS_PER_GTF 7 struct GTM_buffer { u32 PIO_speed0; u32 DMA_speed0; u32 PIO_speed1; u32 DMA_speed1; u32 GTM_flags; }; struct ide_acpi_drive_link { acpi_handle obj_handle; u8 idbuff[512]; }; struct ide_acpi_hwif_link { ide_hwif_t *hwif; acpi_handle obj_handle; struct GTM_buffer gtm; struct ide_acpi_drive_link master; struct ide_acpi_drive_link slave; }; #undef DEBUGGING /* note: adds function name and KERN_DEBUG */ #ifdef DEBUGGING #define DEBPRINT(fmt, args...) \ printk(KERN_DEBUG "%s: " fmt, __func__, ## args) #else #define DEBPRINT(fmt, args...) do {} while (0) #endif /* DEBUGGING */ static int ide_noacpi; module_param_named(noacpi, ide_noacpi, bool, 0); MODULE_PARM_DESC(noacpi, "disable IDE ACPI support"); static int ide_acpigtf; module_param_named(acpigtf, ide_acpigtf, bool, 0); MODULE_PARM_DESC(acpigtf, "enable IDE ACPI _GTF support"); static int ide_acpionboot; module_param_named(acpionboot, ide_acpionboot, bool, 0); MODULE_PARM_DESC(acpionboot, "call IDE ACPI methods on boot"); static bool ide_noacpi_psx; static int no_acpi_psx(const struct dmi_system_id *id) { ide_noacpi_psx = true; printk(KERN_NOTICE"%s detected - disable ACPI _PSx.\n", id->ident); return 0; } static const struct dmi_system_id ide_acpi_dmi_table[] = { /* Bug 9673. */ /* We should check if this is because ACPI NVS isn't save/restored. */ { .callback = no_acpi_psx, .ident = "HP nx9005", .matches = { DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies Ltd."), DMI_MATCH(DMI_BIOS_VERSION, "KAM1.60") }, }, { } /* terminate list */ }; int ide_acpi_init(void) { dmi_check_system(ide_acpi_dmi_table); return 0; } /** * ide_get_dev_handle - finds acpi_handle and PCI device.function * @dev: device to locate * @handle: returned acpi_handle for @dev * @pcidevfn: return PCI device.func for @dev * * Returns the ACPI object handle to the corresponding PCI device. * * Returns 0 on success, <0 on error. */ static int ide_get_dev_handle(struct device *dev, acpi_handle *handle, acpi_integer *pcidevfn) { struct pci_dev *pdev = to_pci_dev(dev); unsigned int bus, devnum, func; acpi_integer addr; acpi_handle dev_handle; struct acpi_buffer buffer = {.length = ACPI_ALLOCATE_BUFFER, .pointer = NULL}; acpi_status status; struct acpi_device_info *dinfo = NULL; int ret = -ENODEV; bus = pdev->bus->number; devnum = PCI_SLOT(pdev->devfn); func = PCI_FUNC(pdev->devfn); /* ACPI _ADR encoding for PCI bus: */ addr = (acpi_integer)(devnum << 16 | func); DEBPRINT("ENTER: pci %02x:%02x.%01x\n", bus, devnum, func); dev_handle = DEVICE_ACPI_HANDLE(dev); if (!dev_handle) { DEBPRINT("no acpi handle for device\n"); goto err; } status = acpi_get_object_info(dev_handle, &buffer); if (ACPI_FAILURE(status)) { DEBPRINT("get_object_info for device failed\n"); goto err; } dinfo = buffer.pointer; if (dinfo && (dinfo->valid & ACPI_VALID_ADR) && dinfo->address == addr) { *pcidevfn = addr; *handle = dev_handle; } else { DEBPRINT("get_object_info for device has wrong " " address: %llu, should be %u\n", dinfo ? (unsigned long long)dinfo->address : -1ULL, (unsigned int)addr); goto err; } DEBPRINT("for dev=0x%x.%x, addr=0x%llx, *handle=0x%p\n", devnum, func, (unsigned long long)addr, *handle); ret = 0; err: kfree(dinfo); return ret; } /** * ide_acpi_hwif_get_handle - Get ACPI object handle for a given hwif * @hwif: device to locate * * Retrieves the object handle for a given hwif. * * Returns handle on success, 0 on error. */ static acpi_handle ide_acpi_hwif_get_handle(ide_hwif_t *hwif) { struct device *dev = hwif->gendev.parent; acpi_handle uninitialized_var(dev_handle); acpi_integer pcidevfn; acpi_handle chan_handle; int err; DEBPRINT("ENTER: device %s\n", hwif->name); if (!dev) { DEBPRINT("no PCI device for %s\n", hwif->name); return NULL; } err = ide_get_dev_handle(dev, &dev_handle, &pcidevfn); if (err < 0) { DEBPRINT("ide_get_dev_handle failed (%d)\n", err); return NULL; } /* get child objects of dev_handle == channel objects, * + _their_ children == drive objects */ /* channel is hwif->channel */ chan_handle = acpi_get_child(dev_handle, hwif->channel); DEBPRINT("chan adr=%d: handle=0x%p\n", hwif->channel, chan_handle); return chan_handle; } /** * do_drive_get_GTF - get the drive bootup default taskfile settings * @drive: the drive for which the taskfile settings should be retrieved * @gtf_length: number of bytes of _GTF data returned at @gtf_address * @gtf_address: buffer containing _GTF taskfile arrays * * The _GTF method has no input parameters. * It returns a variable number of register set values (registers * hex 1F1..1F7, taskfiles). * The <variable number> is not known in advance, so have ACPI-CA * allocate the buffer as needed and return it, then free it later. * * The returned @gtf_length and @gtf_address are only valid if the * function return value is 0. */ static int do_drive_get_GTF(ide_drive_t *drive, unsigned int *gtf_length, unsigned long *gtf_address, unsigned long *obj_loc) { acpi_status status; struct acpi_buffer output; union acpi_object *out_obj; int err = -ENODEV; *gtf_length = 0; *gtf_address = 0UL; *obj_loc = 0UL; if (!drive->acpidata->obj_handle) { DEBPRINT("No ACPI object found for %s\n", drive->name); goto out; } /* Setting up output buffer */ output.length = ACPI_ALLOCATE_BUFFER; output.pointer = NULL; /* ACPI-CA sets this; save/free it later */ /* _GTF has no input parameters */ err = -EIO; status = acpi_evaluate_object(drive->acpidata->obj_handle, "_GTF", NULL, &output); if (ACPI_FAILURE(status)) { printk(KERN_DEBUG "%s: Run _GTF error: status = 0x%x\n", __func__, status); goto out; } if (!output.length || !output.pointer) { DEBPRINT("Run _GTF: " "length or ptr is NULL (0x%llx, 0x%p)\n", (unsigned long long)output.length, output.pointer); goto out; } out_obj = output.pointer; if (out_obj->type != ACPI_TYPE_BUFFER) { DEBPRINT("Run _GTF: error: " "expected object type of ACPI_TYPE_BUFFER, " "got 0x%x\n", out_obj->type); err = -ENOENT; kfree(output.pointer); goto out; } if (!out_obj->buffer.length || !out_obj->buffer.pointer || out_obj->buffer.length % REGS_PER_GTF) { printk(KERN_ERR "%s: unexpected GTF length (%d) or addr (0x%p)\n", __func__, out_obj->buffer.length, out_obj->buffer.pointer); err = -ENOENT; kfree(output.pointer); goto out; } *gtf_length = out_obj->buffer.length; *gtf_address = (unsigned long)out_obj->buffer.pointer; *obj_loc = (unsigned long)out_obj; DEBPRINT("returning gtf_length=%d, gtf_address=0x%lx, obj_loc=0x%lx\n", *gtf_length, *gtf_address, *obj_loc); err = 0; out: return err; } /** * do_drive_set_taskfiles - write the drive taskfile settings from _GTF * @drive: the drive to which the taskfile command should be sent * @gtf_length: total number of bytes of _GTF taskfiles * @gtf_address: location of _GTF taskfile arrays * * Write {gtf_address, length gtf_length} in groups of * REGS_PER_GTF bytes. */ static int do_drive_set_taskfiles(ide_drive_t *drive, unsigned int gtf_length, unsigned long gtf_address) { int rc = 0, err; int gtf_count = gtf_length / REGS_PER_GTF; int ix; DEBPRINT("total GTF bytes=%u (0x%x), gtf_count=%d, addr=0x%lx\n", gtf_length, gtf_length, gtf_count, gtf_address); /* send all taskfile registers (0x1f1-0x1f7) *in*that*order* */ for (ix = 0; ix < gtf_count; ix++) { u8 *gtf = (u8 *)(gtf_address + ix * REGS_PER_GTF); struct ide_cmd cmd; DEBPRINT("(0x1f1-1f7): " "hex: %02x %02x %02x %02x %02x %02x %02x\n", gtf[0], gtf[1], gtf[2], gtf[3], gtf[4], gtf[5], gtf[6]); if (!ide_acpigtf) { DEBPRINT("_GTF execution disabled\n"); continue; } /* convert GTF to taskfile */ memset(&cmd, 0, sizeof(cmd)); memcpy(&cmd.tf.feature, gtf, REGS_PER_GTF); cmd.valid.out.tf = IDE_VALID_OUT_TF | IDE_VALID_DEVICE; cmd.valid.in.tf = IDE_VALID_IN_TF | IDE_VALID_DEVICE; err = ide_no_data_taskfile(drive, &cmd); if (err) { printk(KERN_ERR "%s: ide_no_data_taskfile failed: %u\n", __func__, err); rc = err; } } return rc; } /** * ide_acpi_exec_tfs - get then write drive taskfile settings * @drive: the drive for which the taskfile settings should be * written. * * According to the ACPI spec this should be called after _STM * has been evaluated for the interface. Some ACPI vendors interpret * that as a hard requirement and modify the taskfile according * to the Identify Drive information passed down with _STM. * So one should really make sure to call this only after _STM has * been executed. */ int ide_acpi_exec_tfs(ide_drive_t *drive) { int ret; unsigned int gtf_length; unsigned long gtf_address; unsigned long obj_loc; if (ide_noacpi) return 0; DEBPRINT("call get_GTF, drive=%s port=%d\n", drive->name, drive->dn); ret = do_drive_get_GTF(drive, >f_length, >f_address, &obj_loc); if (ret < 0) { DEBPRINT("get_GTF error (%d)\n", ret); return ret; } DEBPRINT("call set_taskfiles, drive=%s\n", drive->name); ret = do_drive_set_taskfiles(drive, gtf_length, gtf_address); kfree((void *)obj_loc); if (ret < 0) { DEBPRINT("set_taskfiles error (%d)\n", ret); } DEBPRINT("ret=%d\n", ret); return ret; } /** * ide_acpi_get_timing - get the channel (controller) timings * @hwif: target IDE interface (channel) * * This function executes the _GTM ACPI method for the target channel. * */ void ide_acpi_get_timing(ide_hwif_t *hwif) { acpi_status status; struct acpi_buffer output; union acpi_object *out_obj; if (ide_noacpi) return; DEBPRINT("ENTER:\n"); if (!hwif->acpidata) { DEBPRINT("no ACPI data for %s\n", hwif->name); return; } /* Setting up output buffer for _GTM */ output.length = ACPI_ALLOCATE_BUFFER; output.pointer = NULL; /* ACPI-CA sets this; save/free it later */ /* _GTM has no input parameters */ status = acpi_evaluate_object(hwif->acpidata->obj_handle, "_GTM", NULL, &output); DEBPRINT("_GTM status: %d, outptr: 0x%p, outlen: 0x%llx\n", status, output.pointer, (unsigned long long)output.length); if (ACPI_FAILURE(status)) { DEBPRINT("Run _GTM error: status = 0x%x\n", status); return; } if (!output.length || !output.pointer) { DEBPRINT("Run _GTM: length or ptr is NULL (0x%llx, 0x%p)\n", (unsigned long long)output.length, output.pointer); kfree(output.pointer); return; } out_obj = output.pointer; if (out_obj->type != ACPI_TYPE_BUFFER) { kfree(output.pointer); DEBPRINT("Run _GTM: error: " "expected object type of ACPI_TYPE_BUFFER, " "got 0x%x\n", out_obj->type); return; } if (!out_obj->buffer.length || !out_obj->buffer.pointer || out_obj->buffer.length != sizeof(struct GTM_buffer)) { kfree(output.pointer); printk(KERN_ERR "%s: unexpected _GTM length (0x%x)[should be 0x%zx] or " "addr (0x%p)\n", __func__, out_obj->buffer.length, sizeof(struct GTM_buffer), out_obj->buffer.pointer); return; } memcpy(&hwif->acpidata->gtm, out_obj->buffer.pointer, sizeof(struct GTM_buffer)); DEBPRINT("_GTM info: ptr: 0x%p, len: 0x%x, exp.len: 0x%Zx\n", out_obj->buffer.pointer, out_obj->buffer.length, sizeof(struct GTM_buffer)); DEBPRINT("_GTM fields: 0x%x, 0x%x, 0x%x, 0x%x, 0x%x\n", hwif->acpidata->gtm.PIO_speed0, hwif->acpidata->gtm.DMA_speed0, hwif->acpidata->gtm.PIO_speed1, hwif->acpidata->gtm.DMA_speed1, hwif->acpidata->gtm.GTM_flags); kfree(output.pointer); } /** * ide_acpi_push_timing - set the channel (controller) timings * @hwif: target IDE interface (channel) * * This function executes the _STM ACPI method for the target channel. * * _STM requires Identify Drive data, which has to passed as an argument. * Unfortunately drive->id is a mangled version which we can't readily * use; hence we'll get the information afresh. */ void ide_acpi_push_timing(ide_hwif_t *hwif) { acpi_status status; struct acpi_object_list input; union acpi_object in_params[3]; struct ide_acpi_drive_link *master = &hwif->acpidata->master; struct ide_acpi_drive_link *slave = &hwif->acpidata->slave; if (ide_noacpi) return; DEBPRINT("ENTER:\n"); if (!hwif->acpidata) { DEBPRINT("no ACPI data for %s\n", hwif->name); return; } /* Give the GTM buffer + drive Identify data to the channel via the * _STM method: */ /* setup input parameters buffer for _STM */ input.count = 3; 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 || ide_noacpi_psx) return; DEBPRINT("ENTER:\n"); if (!hwif->acpidata) { DEBPRINT("no ACPI data for %s\n", hwif->name); return; } /* 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); } if (!on) acpi_bus_set_power(hwif->acpidata->obj_handle, ACPI_STATE_D3); } /** * 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_acpionboot) { 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); } }