[deliverable/linux.git] / drivers / ata / libata-acpi.c

/*
 * libata-acpi.c
 * Provides ACPI support for PATA/SATA.
 *
 * Copyright (C) 2006 Intel Corp.
 * Copyright (C) 2006 Randy Dunlap
 */

#include <linux/ata.h>
#include <linux/delay.h>
#include <linux/device.h>
#include <linux/errno.h>
#include <linux/kernel.h>
#include <linux/acpi.h>
#include <linux/libata.h>
#include <linux/pci.h>
#include "libata.h"

#include <acpi/acpi_bus.h>
#include <acpi/acnames.h>
#include <acpi/acnamesp.h>
#include <acpi/acparser.h>
#include <acpi/acexcep.h>
#include <acpi/acmacros.h>
#include <acpi/actypes.h>

#define NO_PORT_MULT		0xffff
#define SATA_ADR(root,pmp)	(((root) << 16) | (pmp))

#define REGS_PER_GTF		7
struct taskfile_array {
	u8	tfa[REGS_PER_GTF];	/* regs. 0x1f1 - 0x1f7 */
};

/*
 *	Helper - belongs in the PCI layer somewhere eventually
 */
static int is_pci_dev(struct device *dev)
{
	return (dev->bus == &pci_bus_type);
}

static void ata_acpi_associate_sata_port(struct ata_port *ap)
{
	acpi_integer adr = SATA_ADR(ap->port_no, NO_PORT_MULT);

	ap->device->acpi_handle = acpi_get_child(ap->host->acpi_handle, adr);
}

static void ata_acpi_associate_ide_port(struct ata_port *ap)
{
	int max_devices, i;

	ap->acpi_handle = acpi_get_child(ap->host->acpi_handle, ap->port_no);
	if (!ap->acpi_handle)
		return;

	max_devices = 1;
	if (ap->flags & ATA_FLAG_SLAVE_POSS)
		max_devices++;

	for (i = 0; i < max_devices; i++) {
		struct ata_device *dev = &ap->device[i];

		dev->acpi_handle = acpi_get_child(ap->acpi_handle, i);
	}
}

/**
 * ata_acpi_associate - associate ATA host with ACPI objects
 * @host: target ATA host
 *
 * Look up ACPI objects associated with @host and initialize
 * acpi_handle fields of @host, its ports and devices accordingly.
 *
 * LOCKING:
 * EH context.
 *
 * RETURNS:
 * 0 on success, -errno on failure.
 */
void ata_acpi_associate(struct ata_host *host)
{
	int i;

	if (!is_pci_dev(host->dev) || libata_noacpi)
		return;

	host->acpi_handle = DEVICE_ACPI_HANDLE(host->dev);
	if (!host->acpi_handle)
		return;

	for (i = 0; i < host->n_ports; i++) {
		struct ata_port *ap = host->ports[i];

		if (host->ports[0]->flags & ATA_FLAG_ACPI_SATA)
			ata_acpi_associate_sata_port(ap);
		else
			ata_acpi_associate_ide_port(ap);
	}
}

/**
 * do_drive_get_GTF - get the drive bootup default taskfile settings
 * @dev: target ATA device
 * @gtf_length: number of bytes of _GTF data returned at @gtf_address
 * @gtf_address: buffer containing _GTF taskfile arrays
 *
 * This applies to both PATA and SATA drives.
 *
 * 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(struct ata_device *dev, unsigned int *gtf_length,
			    unsigned long *gtf_address, unsigned long *obj_loc)
{
	struct ata_port *ap = dev->ap;
	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 (!dev->acpi_handle)
		return 0;

	if (ata_msg_probe(ap))
		ata_dev_printk(dev, KERN_DEBUG, "%s: ENTER: port#: %d\n",
			       __FUNCTION__, ap->port_no);

	if (!ata_dev_enabled(dev) || (ap->flags & ATA_FLAG_DISABLED)) {
		if (ata_msg_probe(ap))
			ata_dev_printk(dev, KERN_DEBUG, "%s: ERR: "
				"ata_dev_present: %d, PORT_DISABLED: %lu\n",
				__FUNCTION__, ata_dev_enabled(dev),
				ap->flags & ATA_FLAG_DISABLED);
		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(dev->acpi_handle, "_GTF",
				      NULL, &output);
	if (ACPI_FAILURE(status)) {
		if (ata_msg_probe(ap))
			ata_dev_printk(dev, KERN_DEBUG,
				"%s: Run _GTF error: status = 0x%x\n",
				__FUNCTION__, status);
		goto out;
	}

	if (!output.length || !output.pointer) {
		if (ata_msg_probe(ap))
			ata_dev_printk(dev, KERN_DEBUG, "%s: Run _GTF: "
				"length or ptr is NULL (0x%llx, 0x%p)\n",
				__FUNCTION__,
				(unsigned long long)output.length,
				output.pointer);
		kfree(output.pointer);
		goto out;
	}

	out_obj = output.pointer;
	if (out_obj->type != ACPI_TYPE_BUFFER) {
		kfree(output.pointer);
		if (ata_msg_probe(ap))
			ata_dev_printk(dev, KERN_DEBUG, "%s: Run _GTF: "
				"error: expected object type of "
				" ACPI_TYPE_BUFFER, got 0x%x\n",
				__FUNCTION__, out_obj->type);
		err = -ENOENT;
		goto out;
	}

	if (!out_obj->buffer.length || !out_obj->buffer.pointer ||
	    out_obj->buffer.length % REGS_PER_GTF) {
		if (ata_msg_drv(ap))
			ata_dev_printk(dev, KERN_ERR,
				"%s: unexpected GTF length (%d) or addr (0x%p)\n",
				__FUNCTION__, out_obj->buffer.length,
				out_obj->buffer.pointer);
		err = -ENOENT;
		goto out;
	}

	*gtf_length = out_obj->buffer.length;
	*gtf_address = (unsigned long)out_obj->buffer.pointer;
	*obj_loc = (unsigned long)out_obj;
	if (ata_msg_probe(ap))
		ata_dev_printk(dev, KERN_DEBUG, "%s: returning "
			"gtf_length=%d, gtf_address=0x%lx, obj_loc=0x%lx\n",
			__FUNCTION__, *gtf_length, *gtf_address, *obj_loc);
	err = 0;
out:
	return err;
}

/**
 * taskfile_load_raw - send taskfile registers to host controller
 * @dev: target ATA device
 * @gtf: raw ATA taskfile register set (0x1f1 - 0x1f7)
 *
 * Outputs ATA taskfile to standard ATA host controller using MMIO
 * or PIO as indicated by the ATA_FLAG_MMIO flag.
 * Writes the control, feature, nsect, lbal, lbam, and lbah registers.
 * Optionally (ATA_TFLAG_LBA48) writes hob_feature, hob_nsect,
 * hob_lbal, hob_lbam, and hob_lbah.
 *
 * This function waits for idle (!BUSY and !DRQ) after writing
 * registers.  If the control register has a new value, this
 * function also waits for idle after writing control and before
 * writing the remaining registers.
 *
 * LOCKING: TBD:
 * Inherited from caller.
 */
static void taskfile_load_raw(struct ata_device *dev,
			      const struct taskfile_array *gtf)
{
	struct ata_port *ap = dev->ap;
	struct ata_taskfile tf;
	unsigned int err;

	if (ata_msg_probe(ap))
		ata_dev_printk(dev, KERN_DEBUG, "%s: (0x1f1-1f7): hex: "
			"%02x %02x %02x %02x %02x %02x %02x\n",
			__FUNCTION__,
			gtf->tfa[0], gtf->tfa[1], gtf->tfa[2],
			gtf->tfa[3], gtf->tfa[4], gtf->tfa[5], gtf->tfa[6]);

	if ((gtf->tfa[0] == 0) && (gtf->tfa[1] == 0) && (gtf->tfa[2] == 0)
	    && (gtf->tfa[3] == 0) && (gtf->tfa[4] == 0) && (gtf->tfa[5] == 0)
	    && (gtf->tfa[6] == 0))
		return;

	ata_tf_init(dev, &tf);

	/* convert gtf to tf */
	tf.flags |= ATA_TFLAG_ISADDR | ATA_TFLAG_DEVICE; /* TBD */
	tf.protocol = ATA_PROT_NODATA;
	tf.feature = gtf->tfa[0];	/* 0x1f1 */
	tf.nsect   = gtf->tfa[1];	/* 0x1f2 */
	tf.lbal    = gtf->tfa[2];	/* 0x1f3 */
	tf.lbam    = gtf->tfa[3];	/* 0x1f4 */
	tf.lbah    = gtf->tfa[4];	/* 0x1f5 */
	tf.device  = gtf->tfa[5];	/* 0x1f6 */
	tf.command = gtf->tfa[6];	/* 0x1f7 */

	err = ata_exec_internal(dev, &tf, NULL, DMA_NONE, NULL, 0);
	if (err && ata_msg_probe(ap))
		ata_dev_printk(dev, KERN_ERR,
			"%s: ata_exec_internal failed: %u\n",
			__FUNCTION__, err);
}

/**
 * do_drive_set_taskfiles - write the drive taskfile settings from _GTF
 * @dev: target ATA device
 * @gtf_length: total number of bytes of _GTF taskfiles
 * @gtf_address: location of _GTF taskfile arrays
 *
 * This applies to both PATA and SATA drives.
 *
 * Write {gtf_address, length gtf_length} in groups of
 * REGS_PER_GTF bytes.
 */
static int do_drive_set_taskfiles(struct ata_device *dev,
				  unsigned int gtf_length,
				  unsigned long gtf_address)
{
	struct ata_port *ap = dev->ap;
	int err = -ENODEV;
	int gtf_count = gtf_length / REGS_PER_GTF;
	int ix;
	struct taskfile_array	*gtf;

	if (ata_msg_probe(ap))
		ata_dev_printk(dev, KERN_DEBUG, "%s: ENTER: port#: %d\n",
			       __FUNCTION__, ap->port_no);

	if (!(ap->flags & ATA_FLAG_ACPI_SATA))
		return 0;

	if (!ata_dev_enabled(dev) || (ap->flags & ATA_FLAG_DISABLED))
		goto out;
	if (!gtf_count)		/* shouldn't be here */
		goto out;

	if (gtf_length % REGS_PER_GTF) {
		if (ata_msg_drv(ap))
			ata_dev_printk(dev, KERN_ERR,
				"%s: unexpected GTF length (%d)\n",
				__FUNCTION__, gtf_length);
		goto out;
	}

	for (ix = 0; ix < gtf_count; ix++) {
		gtf = (struct taskfile_array *)
			(gtf_address + ix * REGS_PER_GTF);

		/* send all TaskFile registers (0x1f1-0x1f7) *in*that*order* */
		taskfile_load_raw(dev, gtf);
	}

	err = 0;
out:
	return err;
}

/**
 * ata_acpi_exec_tfs - get then write drive taskfile settings
 * @ap: the ata_port for the drive
 *
 * This applies to both PATA and SATA drives.
 */
int ata_acpi_exec_tfs(struct ata_port *ap)
{
	int ix;
	int ret = 0;
	unsigned int gtf_length;
	unsigned long gtf_address;
	unsigned long obj_loc;

	/*
	 * TBD - implement PATA support.  For now,
	 * we should not run GTF on PATA devices since some
	 * PATA require execution of GTM/STM before GTF.
	 */
	if (!(ap->flags & ATA_FLAG_ACPI_SATA))
		return 0;

	for (ix = 0; ix < ATA_MAX_DEVICES; ix++) {
		struct ata_device *dev = &ap->device[ix];

		if (!ata_dev_enabled(dev))
			continue;

		ret = do_drive_get_GTF(dev, &gtf_length, &gtf_address,
				       &obj_loc);
		if (ret < 0) {
			if (ata_msg_probe(ap))
				ata_port_printk(ap, KERN_DEBUG,
					"%s: get_GTF error (%d)\n",
					__FUNCTION__, ret);
			break;
		}

		ret = do_drive_set_taskfiles(dev, gtf_length, gtf_address);
		kfree((void *)obj_loc);
		if (ret < 0) {
			if (ata_msg_probe(ap))
				ata_port_printk(ap, KERN_DEBUG,
					"%s: set_taskfiles error (%d)\n",
					__FUNCTION__, ret);
			break;
		}
	}

	return ret;
}

/**
 * ata_acpi_push_id - send Identify data to drive
 * @dev: target ATA device
 *
 * _SDD ACPI object: for SATA mode only
 * Must be after Identify (Packet) Device -- uses its data
 * ATM this function never returns a failure.  It is an optional
 * method and if it fails for whatever reason, we should still
 * just keep going.
 */
int ata_acpi_push_id(struct ata_device *dev)
{
	struct ata_port *ap = dev->ap;
	int err;
	acpi_status status;
	struct acpi_object_list input;
	union acpi_object in_params[1];

	if (!dev->acpi_handle)
		return 0;

	if (ata_msg_probe(ap))
		ata_dev_printk(dev, KERN_DEBUG, "%s: ix = %d, port#: %d\n",
			       __FUNCTION__, dev->devno, ap->port_no);

	/* Don't continue if not a SATA device. */
	if (!(ap->flags & ATA_FLAG_ACPI_SATA)) {
		if (ata_msg_probe(ap))
			ata_dev_printk(dev, KERN_DEBUG,
				"%s: Not a SATA device\n", __FUNCTION__);
		goto out;
	}

	/* Give the drive Identify data to the drive via the _SDD method */
	/* _SDD: set up input parameters */
	input.count = 1;
	input.pointer = in_params;
	in_params[0].type = ACPI_TYPE_BUFFER;
	in_params[0].buffer.length = sizeof(dev->id[0]) * ATA_ID_WORDS;
	in_params[0].buffer.pointer = (u8 *)dev->id;
	/* Output buffer: _SDD has no output */

	/* It's OK for _SDD to be missing too. */
	swap_buf_le16(dev->id, ATA_ID_WORDS);
	status = acpi_evaluate_object(dev->acpi_handle, "_SDD", &input, NULL);
	swap_buf_le16(dev->id, ATA_ID_WORDS);

	err = ACPI_FAILURE(status) ? -EIO : 0;
	if (err < 0) {
		if (ata_msg_probe(ap))
			ata_dev_printk(dev, KERN_DEBUG,
				       "%s _SDD error: status = 0x%x\n",
				       __FUNCTION__, status);
	}

	/* always return success */
out:
	return 0;
}
Commit	Line	Data
11ef697b KCA	1	/*
	2	* libata-acpi.c
	3	* Provides ACPI support for PATA/SATA.
	4	*
	5	* Copyright (C) 2006 Intel Corp.
	6	* Copyright (C) 2006 Randy Dunlap
	7	*/
	8
	9	#include <linux/ata.h>
	10	#include <linux/delay.h>
	11	#include <linux/device.h>
	12	#include <linux/errno.h>
	13	#include <linux/kernel.h>
	14	#include <linux/acpi.h>
	15	#include <linux/libata.h>
	16	#include <linux/pci.h>
	17	#include "libata.h"
	18
	19	#include <acpi/acpi_bus.h>
	20	#include <acpi/acnames.h>
	21	#include <acpi/acnamesp.h>
	22	#include <acpi/acparser.h>
	23	#include <acpi/acexcep.h>
	24	#include <acpi/acmacros.h>
	25	#include <acpi/actypes.h>
	26
11ef697b	27	#define NO_PORT_MULT 0xffff
fafbae87	28	#define SATA_ADR(root,pmp) (((root) << 16) \| (pmp))
11ef697b KCA	29
	30	#define REGS_PER_GTF 7
	31	struct taskfile_array {
	32	u8 tfa[REGS_PER_GTF]; /* regs. 0x1f1 - 0x1f7 */
	33	};
	34
ca426635 AC	35	/*
	36	* Helper - belongs in the PCI layer somewhere eventually
	37	*/
	38	static int is_pci_dev(struct device *dev)
	39	{
	40	return (dev->bus == &pci_bus_type);
	41	}
11ef697b	42
fafbae87	43	static void ata_acpi_associate_sata_port(struct ata_port *ap)
11ef697b	44	{
fafbae87 TH	45	acpi_integer adr = SATA_ADR(ap->port_no, NO_PORT_MULT);
	46
	47	ap->device->acpi_handle = acpi_get_child(ap->host->acpi_handle, adr);
11ef697b KCA	48	}
11ef697b KCA	49
fafbae87	50	static void ata_acpi_associate_ide_port(struct ata_port *ap)
11ef697b	51	{
fafbae87	52	int max_devices, i;
11ef697b	53
fafbae87 TH	54	ap->acpi_handle = acpi_get_child(ap->host->acpi_handle, ap->port_no);
	55	if (!ap->acpi_handle)
	56	return;
11ef697b	57
fafbae87 TH	58	max_devices = 1;
	59	if (ap->flags & ATA_FLAG_SLAVE_POSS)
	60	max_devices++;
11ef697b	61
fafbae87 TH	62	for (i = 0; i < max_devices; i++) {
fafbae87 TH	63	struct ata_device *dev = &ap->device[i];
11ef697b	64
fafbae87	65	dev->acpi_handle = acpi_get_child(ap->acpi_handle, i);
11ef697b	66	}
11ef697b KCA	67	}
11ef697b KCA	68
fafbae87 TH	69	/**
	70	* ata_acpi_associate - associate ATA host with ACPI objects
	71	* @host: target ATA host
	72	*
	73	* Look up ACPI objects associated with @host and initialize
	74	* acpi_handle fields of @host, its ports and devices accordingly.
	75	*
	76	* LOCKING:
	77	* EH context.
	78	*
	79	* RETURNS:
	80	* 0 on success, -errno on failure.
	81	*/
	82	void ata_acpi_associate(struct ata_host *host)
11ef697b	83	{
fafbae87	84	int i;
11ef697b	85
fafbae87 TH	86	if (!is_pci_dev(host->dev) \|\| libata_noacpi)
fafbae87 TH	87	return;
11ef697b	88
fafbae87 TH	89	host->acpi_handle = DEVICE_ACPI_HANDLE(host->dev);
	90	if (!host->acpi_handle)
	91	return;
11ef697b	92
fafbae87 TH	93	for (i = 0; i < host->n_ports; i++) {
	94	struct ata_port *ap = host->ports[i];
	95
	96	if (host->ports[0]->flags & ATA_FLAG_ACPI_SATA)
	97	ata_acpi_associate_sata_port(ap);
	98	else
	99	ata_acpi_associate_ide_port(ap);
11ef697b	100	}
11ef697b KCA	101	}
	102
	103	/**
	104	* do_drive_get_GTF - get the drive bootup default taskfile settings
3a32a8e9	105	* @dev: target ATA device
11ef697b KCA	106	* @gtf_length: number of bytes of _GTF data returned at @gtf_address
	107	* @gtf_address: buffer containing _GTF taskfile arrays
	108	*
	109	* This applies to both PATA and SATA drives.
	110	*
	111	* The _GTF method has no input parameters.
	112	* It returns a variable number of register set values (registers
	113	* hex 1F1..1F7, taskfiles).
	114	* The <variable number> is not known in advance, so have ACPI-CA
	115	* allocate the buffer as needed and return it, then free it later.
	116	*
	117	* The returned @gtf_length and @gtf_address are only valid if the
	118	* function return value is 0.
	119	*/
3a32a8e9 TH	120	static int do_drive_get_GTF(struct ata_device dev, unsigned int gtf_length,
3a32a8e9 TH	121	unsigned long gtf_address, unsigned long obj_loc)
11ef697b	122	{
3a32a8e9 TH	123	struct ata_port *ap = dev->ap;
3a32a8e9 TH	124	acpi_status status;
3a32a8e9 TH	125	struct acpi_buffer output;
3a32a8e9 TH	126	union acpi_object *out_obj;
3a32a8e9	127	int err = -ENODEV;
11ef697b KCA	128
	129	*gtf_length = 0;
	130	*gtf_address = 0UL;
	131	*obj_loc = 0UL;
	132
fafbae87	133	if (!dev->acpi_handle)
11ef697b KCA	134	return 0;
	135
	136	if (ata_msg_probe(ap))
3a32a8e9	137	ata_dev_printk(dev, KERN_DEBUG, "%s: ENTER: port#: %d\n",
878d4fed	138	__FUNCTION__, ap->port_no);
11ef697b	139
3a32a8e9	140	if (!ata_dev_enabled(dev) \|\| (ap->flags & ATA_FLAG_DISABLED)) {
11ef697b	141	if (ata_msg_probe(ap))
3a32a8e9	142	ata_dev_printk(dev, KERN_DEBUG, "%s: ERR: "
11ef697b	143	"ata_dev_present: %d, PORT_DISABLED: %lu\n",
3a32a8e9	144	__FUNCTION__, ata_dev_enabled(dev),
11ef697b KCA	145	ap->flags & ATA_FLAG_DISABLED);
	146	goto out;
	147	}
	148
11ef697b KCA	149	/* Setting up output buffer */
	150	output.length = ACPI_ALLOCATE_BUFFER;
	151	output.pointer = NULL; /* ACPI-CA sets this; save/free it later */
	152
	153	/* _GTF has no input parameters */
	154	err = -EIO;
fafbae87 TH	155	status = acpi_evaluate_object(dev->acpi_handle, "_GTF",
fafbae87 TH	156	NULL, &output);
11ef697b KCA	157	if (ACPI_FAILURE(status)) {
11ef697b KCA	158	if (ata_msg_probe(ap))
3a32a8e9	159	ata_dev_printk(dev, KERN_DEBUG,
11ef697b KCA	160	"%s: Run _GTF error: status = 0x%x\n",
	161	__FUNCTION__, status);
	162	goto out;
	163	}
	164
	165	if (!output.length \|\| !output.pointer) {
	166	if (ata_msg_probe(ap))
3a32a8e9	167	ata_dev_printk(dev, KERN_DEBUG, "%s: Run _GTF: "
11ef697b KCA	168	"length or ptr is NULL (0x%llx, 0x%p)\n",
	169	__FUNCTION__,
	170	(unsigned long long)output.length,
	171	output.pointer);
	172	kfree(output.pointer);
	173	goto out;
	174	}
	175
	176	out_obj = output.pointer;
	177	if (out_obj->type != ACPI_TYPE_BUFFER) {
	178	kfree(output.pointer);
	179	if (ata_msg_probe(ap))
3a32a8e9	180	ata_dev_printk(dev, KERN_DEBUG, "%s: Run _GTF: "
11ef697b KCA	181	"error: expected object type of "
	182	" ACPI_TYPE_BUFFER, got 0x%x\n",
	183	__FUNCTION__, out_obj->type);
	184	err = -ENOENT;
	185	goto out;
	186	}
	187
	188	if (!out_obj->buffer.length \|\| !out_obj->buffer.pointer \|\|
	189	out_obj->buffer.length % REGS_PER_GTF) {
	190	if (ata_msg_drv(ap))
3a32a8e9	191	ata_dev_printk(dev, KERN_ERR,
11ef697b KCA	192	"%s: unexpected GTF length (%d) or addr (0x%p)\n",
	193	__FUNCTION__, out_obj->buffer.length,
	194	out_obj->buffer.pointer);
	195	err = -ENOENT;
	196	goto out;
	197	}
	198
	199	*gtf_length = out_obj->buffer.length;
	200	*gtf_address = (unsigned long)out_obj->buffer.pointer;
	201	*obj_loc = (unsigned long)out_obj;
	202	if (ata_msg_probe(ap))
3a32a8e9	203	ata_dev_printk(dev, KERN_DEBUG, "%s: returning "
11ef697b KCA	204	"gtf_length=%d, gtf_address=0x%lx, obj_loc=0x%lx\n",
	205	__FUNCTION__, gtf_length, gtf_address, *obj_loc);
	206	err = 0;
	207	out:
	208	return err;
	209	}
	210
	211	/**
	212	* taskfile_load_raw - send taskfile registers to host controller
3a32a8e9	213	* @dev: target ATA device
11ef697b KCA	214	* @gtf: raw ATA taskfile register set (0x1f1 - 0x1f7)
	215	*
	216	* Outputs ATA taskfile to standard ATA host controller using MMIO
	217	* or PIO as indicated by the ATA_FLAG_MMIO flag.
	218	* Writes the control, feature, nsect, lbal, lbam, and lbah registers.
	219	* Optionally (ATA_TFLAG_LBA48) writes hob_feature, hob_nsect,
	220	* hob_lbal, hob_lbam, and hob_lbah.
	221	*
	222	* This function waits for idle (!BUSY and !DRQ) after writing
	223	* registers. If the control register has a new value, this
	224	* function also waits for idle after writing control and before
	225	* writing the remaining registers.
	226	*
	227	* LOCKING: TBD:
	228	* Inherited from caller.
	229	*/
3a32a8e9 TH	230	static void taskfile_load_raw(struct ata_device *dev,
3a32a8e9 TH	231	const struct taskfile_array *gtf)
11ef697b	232	{
3a32a8e9	233	struct ata_port *ap = dev->ap;
fc16c25f JG	234	struct ata_taskfile tf;
	235	unsigned int err;
	236
11ef697b	237	if (ata_msg_probe(ap))
3a32a8e9	238	ata_dev_printk(dev, KERN_DEBUG, "%s: (0x1f1-1f7): hex: "
11ef697b KCA	239	"%02x %02x %02x %02x %02x %02x %02x\n",
	240	__FUNCTION__,
	241	gtf->tfa[0], gtf->tfa[1], gtf->tfa[2],
	242	gtf->tfa[3], gtf->tfa[4], gtf->tfa[5], gtf->tfa[6]);
	243
	244	if ((gtf->tfa[0] == 0) && (gtf->tfa[1] == 0) && (gtf->tfa[2] == 0)
	245	&& (gtf->tfa[3] == 0) && (gtf->tfa[4] == 0) && (gtf->tfa[5] == 0)
	246	&& (gtf->tfa[6] == 0))
	247	return;
	248
3a32a8e9	249	ata_tf_init(dev, &tf);
fc16c25f JG	250
	251	/* convert gtf to tf */
	252	tf.flags \|= ATA_TFLAG_ISADDR \| ATA_TFLAG_DEVICE; /* TBD */
48be6b18	253	tf.protocol = ATA_PROT_NODATA;
fc16c25f JG	254	tf.feature = gtf->tfa[0]; /* 0x1f1 */
	255	tf.nsect = gtf->tfa[1]; /* 0x1f2 */
	256	tf.lbal = gtf->tfa[2]; /* 0x1f3 */
	257	tf.lbam = gtf->tfa[3]; /* 0x1f4 */
	258	tf.lbah = gtf->tfa[4]; /* 0x1f5 */
	259	tf.device = gtf->tfa[5]; /* 0x1f6 */
	260	tf.command = gtf->tfa[6]; /* 0x1f7 */
	261
3a32a8e9	262	err = ata_exec_internal(dev, &tf, NULL, DMA_NONE, NULL, 0);
fc16c25f	263	if (err && ata_msg_probe(ap))
3a32a8e9	264	ata_dev_printk(dev, KERN_ERR,
fc16c25f JG	265	"%s: ata_exec_internal failed: %u\n",
fc16c25f JG	266	__FUNCTION__, err);
11ef697b KCA	267	}
	268
	269	/**
	270	* do_drive_set_taskfiles - write the drive taskfile settings from _GTF
3a32a8e9	271	* @dev: target ATA device
11ef697b KCA	272	* @gtf_length: total number of bytes of _GTF taskfiles
	273	* @gtf_address: location of _GTF taskfile arrays
	274	*
	275	* This applies to both PATA and SATA drives.
	276	*
	277	* Write {gtf_address, length gtf_length} in groups of
	278	* REGS_PER_GTF bytes.
	279	*/
3a32a8e9 TH	280	static int do_drive_set_taskfiles(struct ata_device *dev,
	281	unsigned int gtf_length,
	282	unsigned long gtf_address)
11ef697b	283	{
3a32a8e9 TH	284	struct ata_port *ap = dev->ap;
	285	int err = -ENODEV;
	286	int gtf_count = gtf_length / REGS_PER_GTF;
	287	int ix;
11ef697b KCA	288	struct taskfile_array *gtf;
	289
	290	if (ata_msg_probe(ap))
3a32a8e9	291	ata_dev_printk(dev, KERN_DEBUG, "%s: ENTER: port#: %d\n",
878d4fed	292	__FUNCTION__, ap->port_no);
11ef697b	293
fafbae87	294	if (!(ap->flags & ATA_FLAG_ACPI_SATA))
11ef697b KCA	295	return 0;
11ef697b KCA	296
3a32a8e9	297	if (!ata_dev_enabled(dev) \|\| (ap->flags & ATA_FLAG_DISABLED))
11ef697b KCA	298	goto out;
	299	if (!gtf_count) /* shouldn't be here */
	300	goto out;
	301
	302	if (gtf_length % REGS_PER_GTF) {
	303	if (ata_msg_drv(ap))
3a32a8e9	304	ata_dev_printk(dev, KERN_ERR,
11ef697b KCA	305	"%s: unexpected GTF length (%d)\n",
	306	__FUNCTION__, gtf_length);
	307	goto out;
	308	}
	309
	310	for (ix = 0; ix < gtf_count; ix++) {
	311	gtf = (struct taskfile_array *)
	312	(gtf_address + ix * REGS_PER_GTF);
	313
	314	/* send all TaskFile registers (0x1f1-0x1f7) inthatorder */
3a32a8e9	315	taskfile_load_raw(dev, gtf);
11ef697b KCA	316	}
	317
	318	err = 0;
	319	out:
	320	return err;
	321	}
	322
	323	/**
	324	* ata_acpi_exec_tfs - get then write drive taskfile settings
	325	* @ap: the ata_port for the drive
	326	*
	327	* This applies to both PATA and SATA drives.
	328	*/
	329	int ata_acpi_exec_tfs(struct ata_port *ap)
	330	{
3a32a8e9 TH	331	int ix;
	332	int ret = 0;
	333	unsigned int gtf_length;
	334	unsigned long gtf_address;
	335	unsigned long obj_loc;
11ef697b	336
df33c77e KA	337	/*
	338	* TBD - implement PATA support. For now,
	339	* we should not run GTF on PATA devices since some
	340	* PATA require execution of GTM/STM before GTF.
	341	*/
3cadbcc0	342	if (!(ap->flags & ATA_FLAG_ACPI_SATA))
df33c77e	343	return 0;
11ef697b KCA	344
11ef697b KCA	345	for (ix = 0; ix < ATA_MAX_DEVICES; ix++) {
3a32a8e9 TH	346	struct ata_device *dev = &ap->device[ix];
	347
	348	if (!ata_dev_enabled(dev))
11ef697b KCA	349	continue;
11ef697b KCA	350
3a32a8e9 TH	351	ret = do_drive_get_GTF(dev, &gtf_length, &gtf_address,
3a32a8e9 TH	352	&obj_loc);
11ef697b KCA	353	if (ret < 0) {
	354	if (ata_msg_probe(ap))
	355	ata_port_printk(ap, KERN_DEBUG,
	356	"%s: get_GTF error (%d)\n",
	357	__FUNCTION__, ret);
	358	break;
	359	}
	360
3a32a8e9	361	ret = do_drive_set_taskfiles(dev, gtf_length, gtf_address);
11ef697b KCA	362	kfree((void *)obj_loc);
	363	if (ret < 0) {
	364	if (ata_msg_probe(ap))
	365	ata_port_printk(ap, KERN_DEBUG,
	366	"%s: set_taskfiles error (%d)\n",
	367	__FUNCTION__, ret);
	368	break;
	369	}
	370	}
	371
	372	return ret;
	373	}
	374
7ea1fbc2 KCA	375	/**
7ea1fbc2 KCA	376	* ata_acpi_push_id - send Identify data to drive
3a32a8e9	377	* @dev: target ATA device
7ea1fbc2 KCA	378	*
	379	* _SDD ACPI object: for SATA mode only
	380	* Must be after Identify (Packet) Device -- uses its data
	381	* ATM this function never returns a failure. It is an optional
	382	* method and if it fails for whatever reason, we should still
	383	* just keep going.
	384	*/
3a32a8e9	385	int ata_acpi_push_id(struct ata_device *dev)
7ea1fbc2	386	{
3a32a8e9	387	struct ata_port *ap = dev->ap;
3a32a8e9	388	int err;
3a32a8e9 TH	389	acpi_status status;
	390	struct acpi_object_list input;
	391	union acpi_object in_params[1];
7ea1fbc2	392
fafbae87	393	if (!dev->acpi_handle)
7ea1fbc2 KCA	394	return 0;
	395
	396	if (ata_msg_probe(ap))
3a32a8e9 TH	397	ata_dev_printk(dev, KERN_DEBUG, "%s: ix = %d, port#: %d\n",
3a32a8e9 TH	398	__FUNCTION__, dev->devno, ap->port_no);
7ea1fbc2 KCA	399
7ea1fbc2 KCA	400	/* Don't continue if not a SATA device. */
3cadbcc0	401	if (!(ap->flags & ATA_FLAG_ACPI_SATA)) {
7ea1fbc2	402	if (ata_msg_probe(ap))
3a32a8e9	403	ata_dev_printk(dev, KERN_DEBUG,
7ea1fbc2 KCA	404	"%s: Not a SATA device\n", __FUNCTION__);
	405	goto out;
	406	}
	407
7ea1fbc2 KCA	408	/* Give the drive Identify data to the drive via the _SDD method */
	409	/* _SDD: set up input parameters */
	410	input.count = 1;
	411	input.pointer = in_params;
	412	in_params[0].type = ACPI_TYPE_BUFFER;
3a32a8e9 TH	413	in_params[0].buffer.length = sizeof(dev->id[0]) * ATA_ID_WORDS;
3a32a8e9 TH	414	in_params[0].buffer.pointer = (u8 *)dev->id;
7ea1fbc2 KCA	415	/* Output buffer: _SDD has no output */
	416
	417	/* It's OK for _SDD to be missing too. */
3a32a8e9	418	swap_buf_le16(dev->id, ATA_ID_WORDS);
fafbae87	419	status = acpi_evaluate_object(dev->acpi_handle, "_SDD", &input, NULL);
3a32a8e9	420	swap_buf_le16(dev->id, ATA_ID_WORDS);
7ea1fbc2 KCA	421
	422	err = ACPI_FAILURE(status) ? -EIO : 0;
	423	if (err < 0) {
	424	if (ata_msg_probe(ap))
3a32a8e9	425	ata_dev_printk(dev, KERN_DEBUG,
878d4fed TH	426	"%s _SDD error: status = 0x%x\n",
878d4fed TH	427	__FUNCTION__, status);
7ea1fbc2 KCA	428	}
	429
	430	/* always return success */
	431	out:
	432	return 0;
	433	}
	434
	435