drivers/ata/pata_cmd640.c - linux-mtk - Git at Google

 /*
  * pata_cmd640.c 	- CMD640 PCI PATA for new ATA layer
  *			  (C) 2007 Red Hat Inc
  *
  * Based upon
  *  linux/drivers/ide/pci/cmd640.c		Version 1.02  Sep 01, 1996
  *
  *  Copyright (C) 1995-1996  Linus Torvalds & authors (see driver)
  *
  *	This drives only the PCI version of the controller. If you have a
  *	VLB one then we have enough docs to support it but you can write
  *	your own code.
  */

 #include <linux/kernel.h>
 #include <linux/module.h>
 #include <linux/pci.h>
 #include <linux/blkdev.h>
 #include <linux/delay.h>
 #include <linux/gfp.h>
 #include <scsi/scsi_host.h>
 #include <linux/libata.h>

 #define DRV_NAME "pata_cmd640"
 #define DRV_VERSION "0.0.5"

 struct cmd640_reg {
 	int last;
 	u8 reg58[ATA_MAX_DEVICES];
 };

 enum {
 	CFR = 0x50,
 	CNTRL = 0x51,
 	CMDTIM = 0x52,
 	ARTIM0 = 0x53,
 	DRWTIM0 = 0x54,
 	ARTIM23 = 0x57,
 	DRWTIM23 = 0x58,
 	BRST = 0x59
 };

 /**
  *	cmd640_set_piomode	-	set initial PIO mode data
  *	@ap: ATA port
  *	@adev: ATA device
  *
  *	Called to do the PIO mode setup.
  */

 static void cmd640_set_piomode(struct ata_port *ap, struct ata_device *adev)
 {
 	struct cmd640_reg *timing = ap->private_data;
 	struct pci_dev *pdev = to_pci_dev(ap->host->dev);
 	struct ata_timing t;
 	const unsigned long T = 1000000 / 33;
 	const u8 setup_data[] = { 0x40, 0x40, 0x40, 0x80, 0x00 };
 	u8 reg;
 	int arttim = ARTIM0 + 2 * adev->devno;
 	struct ata_device *pair = ata_dev_pair(adev);

 	if (ata_timing_compute(adev, adev->pio_mode, &t, T, 0) < 0) {
 		printk(KERN_ERR DRV_NAME ": mode computation failed.\n");
 		return;
 	}

 	/* The second channel has shared timings and the setup timing is
 	   messy to switch to merge it for worst case */
 	if (ap->port_no && pair) {
 		struct ata_timing p;
 		ata_timing_compute(pair, pair->pio_mode, &p, T, 1);
 		ata_timing_merge(&p, &t, &t, ATA_TIMING_SETUP);
 	}

 	/* Make the timings fit */
 	if (t.recover > 16) {
 		t.active += t.recover - 16;
 		t.recover = 16;
 	}
 	if (t.active > 16)
 		t.active = 16;

 	/* Now convert the clocks into values we can actually stuff into
 	   the chip */

 	if (t.recover > 1)
 		t.recover--;	/* 640B only */
 	else
 		t.recover = 15;

 	if (t.setup > 4)
 		t.setup = 0xC0;
 	else
 		t.setup = setup_data[t.setup];

 	if (ap->port_no == 0) {
 		t.active &= 0x0F;	/* 0 = 16 */

 		/* Load setup timing */
 		pci_read_config_byte(pdev, arttim, &reg);
 		reg &= 0x3F;
 		reg |= t.setup;
 		pci_write_config_byte(pdev, arttim, reg);

 		/* Load active/recovery */
 		pci_write_config_byte(pdev, arttim + 1, (t.active << 4) | t.recover);
 	} else {
 		/* Save the shared timings for channel, they will be loaded
 		   by qc_issue. Reloading the setup time is expensive so we
 		   keep a merged one loaded */
 		pci_read_config_byte(pdev, ARTIM23, &reg);
 		reg &= 0x3F;
 		reg |= t.setup;
 		pci_write_config_byte(pdev, ARTIM23, reg);
 		timing->reg58[adev->devno] = (t.active << 4) | t.recover;
 	}
 }


 /**
  *	cmd640_qc_issue	-	command preparation hook
  *	@qc: Command to be issued
  *
  *	Channel 1 has shared timings. We must reprogram the
  *	clock each drive 2/3 switch we do.
  */

 static unsigned int cmd640_qc_issue(struct ata_queued_cmd *qc)
 {
 	struct ata_port *ap = qc->ap;
 	struct ata_device *adev = qc->dev;
 	struct pci_dev *pdev = to_pci_dev(ap->host->dev);
 	struct cmd640_reg *timing = ap->private_data;

 	if (ap->port_no != 0 && adev->devno != timing->last) {
 		pci_write_config_byte(pdev, DRWTIM23, timing->reg58[adev->devno]);
 		timing->last = adev->devno;
 	}
 	return ata_sff_qc_issue(qc);
 }

 /**
  *	cmd640_port_start	-	port setup
  *	@ap: ATA port being set up
  *
  *	The CMD640 needs to maintain private data structures so we
  *	allocate space here.
  */

 static int cmd640_port_start(struct ata_port *ap)
 {
 	struct pci_dev *pdev = to_pci_dev(ap->host->dev);
 	struct cmd640_reg *timing;

 	timing = devm_kzalloc(&pdev->dev, sizeof(struct cmd640_reg), GFP_KERNEL);
 	if (timing == NULL)
 		return -ENOMEM;
 	timing->last = -1;	/* Force a load */
 	ap->private_data = timing;
 	return 0;
 }

 static bool cmd640_sff_irq_check(struct ata_port *ap)
 {
 	struct pci_dev *pdev	= to_pci_dev(ap->host->dev);
 	int irq_reg		= ap->port_no ? ARTIM23 : CFR;
 	u8  irq_stat, irq_mask	= ap->port_no ? 0x10 : 0x04;

 	pci_read_config_byte(pdev, irq_reg, &irq_stat);

 	return irq_stat & irq_mask;
 }

 static struct scsi_host_template cmd640_sht = {
 	ATA_PIO_SHT(DRV_NAME),
 };

 static struct ata_port_operations cmd640_port_ops = {
 	.inherits	= &ata_sff_port_ops,
 	/* In theory xfer_noirq is not needed once we kill the prefetcher */
 	.sff_data_xfer	= ata_sff_data_xfer32,
 	.sff_irq_check	= cmd640_sff_irq_check,
 	.qc_issue	= cmd640_qc_issue,
 	.cable_detect	= ata_cable_40wire,
 	.set_piomode	= cmd640_set_piomode,
 	.port_start	= cmd640_port_start,
 };

 static void cmd640_hardware_init(struct pci_dev *pdev)
 {
 	u8 ctrl;

 	/* CMD640 detected, commiserations */
 	pci_write_config_byte(pdev, 0x5B, 0x00);
 	/* PIO0 command cycles */
 	pci_write_config_byte(pdev, CMDTIM, 0);
 	/* 512 byte bursts (sector) */
 	pci_write_config_byte(pdev, BRST, 0x40);
 	/*
 	 * A reporter a long time ago
 	 * Had problems with the data fifo
 	 * So don't run the risk
 	 * Of putting crap on the disk
 	 * For its better just to go slow
 	 */
 	/* Do channel 0 */
 	pci_read_config_byte(pdev, CNTRL, &ctrl);
 	pci_write_config_byte(pdev, CNTRL, ctrl | 0xC0);
 	/* Ditto for channel 1 */
 	pci_read_config_byte(pdev, ARTIM23, &ctrl);
 	ctrl |= 0x0C;
 	pci_write_config_byte(pdev, ARTIM23, ctrl);
 }

 static int cmd640_init_one(struct pci_dev *pdev, const struct pci_device_id *id)
 {
 	static const struct ata_port_info info = {
 		.flags = ATA_FLAG_SLAVE_POSS,
 		.pio_mask = ATA_PIO4,
 		.port_ops = &cmd640_port_ops
 	};
 	const struct ata_port_info *ppi[] = { &info, NULL };
 	int rc;

 	rc = pcim_enable_device(pdev);
 	if (rc)
 		return rc;

 	cmd640_hardware_init(pdev);

 	return ata_pci_sff_init_one(pdev, ppi, &cmd640_sht, NULL, 0);
 }

 #ifdef CONFIG_PM_SLEEP
 static int cmd640_reinit_one(struct pci_dev *pdev)
 {
 	struct ata_host *host = pci_get_drvdata(pdev);
 	int rc;

 	rc = ata_pci_device_do_resume(pdev);
 	if (rc)
 		return rc;
 	cmd640_hardware_init(pdev);
 	ata_host_resume(host);
 	return 0;
 }
 #endif

 static const struct pci_device_id cmd640[] = {
 	{ PCI_VDEVICE(CMD, 0x640), 0 },
 	{ },
 };

 static struct pci_driver cmd640_pci_driver = {
 	.name 		= DRV_NAME,
 	.id_table	= cmd640,
 	.probe 		= cmd640_init_one,
 	.remove		= ata_pci_remove_one,
 #ifdef CONFIG_PM_SLEEP
 	.suspend	= ata_pci_device_suspend,
 	.resume		= cmd640_reinit_one,
 #endif
 };

 module_pci_driver(cmd640_pci_driver);

 MODULE_AUTHOR("Alan Cox");
 MODULE_DESCRIPTION("low-level driver for CMD640 PATA controllers");
 MODULE_LICENSE("GPL");
 MODULE_DEVICE_TABLE(pci, cmd640);
 MODULE_VERSION(DRV_VERSION);
	/*
	* pata_cmd640.c - CMD640 PCI PATA for new ATA layer
	* (C) 2007 Red Hat Inc
	*
	* Based upon
	* linux/drivers/ide/pci/cmd640.c Version 1.02 Sep 01, 1996
	*
	* Copyright (C) 1995-1996 Linus Torvalds & authors (see driver)
	*
	* This drives only the PCI version of the controller. If you have a
	* VLB one then we have enough docs to support it but you can write
	* your own code.
	*/

	#include <linux/kernel.h>
	#include <linux/module.h>
	#include <linux/pci.h>
	#include <linux/blkdev.h>
	#include <linux/delay.h>
	#include <linux/gfp.h>
	#include <scsi/scsi_host.h>
	#include <linux/libata.h>

	#define DRV_NAME "pata_cmd640"
	#define DRV_VERSION "0.0.5"

	struct cmd640_reg {
	int last;
	u8 reg58[ATA_MAX_DEVICES];
	};

	enum {
	CFR = 0x50,
	CNTRL = 0x51,
	CMDTIM = 0x52,
	ARTIM0 = 0x53,
	DRWTIM0 = 0x54,
	ARTIM23 = 0x57,
	DRWTIM23 = 0x58,
	BRST = 0x59
	};

	/**
	* cmd640_set_piomode - set initial PIO mode data
	* @ap: ATA port
	* @adev: ATA device
	*
	* Called to do the PIO mode setup.
	*/

	static void cmd640_set_piomode(struct ata_port ap, struct ata_device adev)
	{
	struct cmd640_reg *timing = ap->private_data;
	struct pci_dev *pdev = to_pci_dev(ap->host->dev);
	struct ata_timing t;
	const unsigned long T = 1000000 / 33;
	const u8 setup_data[] = { 0x40, 0x40, 0x40, 0x80, 0x00 };
	u8 reg;
	int arttim = ARTIM0 + 2 * adev->devno;
	struct ata_device *pair = ata_dev_pair(adev);

	if (ata_timing_compute(adev, adev->pio_mode, &t, T, 0) < 0) {
	printk(KERN_ERR DRV_NAME ": mode computation failed.\n");
	return;
	}

	/* The second channel has shared timings and the setup timing is
	messy to switch to merge it for worst case */
	if (ap->port_no && pair) {
	struct ata_timing p;
	ata_timing_compute(pair, pair->pio_mode, &p, T, 1);
	ata_timing_merge(&p, &t, &t, ATA_TIMING_SETUP);
	}

	/* Make the timings fit */
	if (t.recover > 16) {
	t.active += t.recover - 16;
	t.recover = 16;
	}
	if (t.active > 16)
	t.active = 16;

	/* Now convert the clocks into values we can actually stuff into
	the chip */

	if (t.recover > 1)
	t.recover--; /* 640B only */
	else
	t.recover = 15;

	if (t.setup > 4)
	t.setup = 0xC0;
	else
	t.setup = setup_data[t.setup];

	if (ap->port_no == 0) {
	t.active &= 0x0F; /* 0 = 16 */

	/* Load setup timing */
	pci_read_config_byte(pdev, arttim, &reg);
	reg &= 0x3F;
	reg \|= t.setup;
	pci_write_config_byte(pdev, arttim, reg);

	/* Load active/recovery */
	pci_write_config_byte(pdev, arttim + 1, (t.active << 4) \| t.recover);
	} else {
	/* Save the shared timings for channel, they will be loaded
	by qc_issue. Reloading the setup time is expensive so we
	keep a merged one loaded */
	pci_read_config_byte(pdev, ARTIM23, &reg);
	reg &= 0x3F;
	reg \|= t.setup;
	pci_write_config_byte(pdev, ARTIM23, reg);
	timing->reg58[adev->devno] = (t.active << 4) \| t.recover;
	}
	}


	/**
	* cmd640_qc_issue - command preparation hook
	* @qc: Command to be issued
	*
	* Channel 1 has shared timings. We must reprogram the
	* clock each drive 2/3 switch we do.
	*/

	static unsigned int cmd640_qc_issue(struct ata_queued_cmd *qc)
	{
	struct ata_port *ap = qc->ap;
	struct ata_device *adev = qc->dev;
	struct pci_dev *pdev = to_pci_dev(ap->host->dev);
	struct cmd640_reg *timing = ap->private_data;

	if (ap->port_no != 0 && adev->devno != timing->last) {
	pci_write_config_byte(pdev, DRWTIM23, timing->reg58[adev->devno]);
	timing->last = adev->devno;
	}
	return ata_sff_qc_issue(qc);
	}

	/**
	* cmd640_port_start - port setup
	* @ap: ATA port being set up
	*
	* The CMD640 needs to maintain private data structures so we
	* allocate space here.
	*/

	static int cmd640_port_start(struct ata_port *ap)
	{
	struct pci_dev *pdev = to_pci_dev(ap->host->dev);
	struct cmd640_reg *timing;

	timing = devm_kzalloc(&pdev->dev, sizeof(struct cmd640_reg), GFP_KERNEL);
	if (timing == NULL)
	return -ENOMEM;
	timing->last = -1; /* Force a load */
	ap->private_data = timing;
	return 0;
	}

	static bool cmd640_sff_irq_check(struct ata_port *ap)
	{
	struct pci_dev *pdev = to_pci_dev(ap->host->dev);
	int irq_reg = ap->port_no ? ARTIM23 : CFR;
	u8 irq_stat, irq_mask = ap->port_no ? 0x10 : 0x04;

	pci_read_config_byte(pdev, irq_reg, &irq_stat);

	return irq_stat & irq_mask;
	}

	static struct scsi_host_template cmd640_sht = {
	ATA_PIO_SHT(DRV_NAME),
	};

	static struct ata_port_operations cmd640_port_ops = {
	.inherits = &ata_sff_port_ops,
	/* In theory xfer_noirq is not needed once we kill the prefetcher */
	.sff_data_xfer = ata_sff_data_xfer32,
	.sff_irq_check = cmd640_sff_irq_check,
	.qc_issue = cmd640_qc_issue,
	.cable_detect = ata_cable_40wire,
	.set_piomode = cmd640_set_piomode,
	.port_start = cmd640_port_start,
	};

	static void cmd640_hardware_init(struct pci_dev *pdev)
	{
	u8 ctrl;

	/* CMD640 detected, commiserations */
	pci_write_config_byte(pdev, 0x5B, 0x00);
	/* PIO0 command cycles */
	pci_write_config_byte(pdev, CMDTIM, 0);
	/* 512 byte bursts (sector) */
	pci_write_config_byte(pdev, BRST, 0x40);
	/*
	* A reporter a long time ago
	* Had problems with the data fifo
	* So don't run the risk
	* Of putting crap on the disk
	* For its better just to go slow
	*/
	/* Do channel 0 */
	pci_read_config_byte(pdev, CNTRL, &ctrl);
	pci_write_config_byte(pdev, CNTRL, ctrl \| 0xC0);
	/* Ditto for channel 1 */
	pci_read_config_byte(pdev, ARTIM23, &ctrl);
	ctrl \|= 0x0C;
	pci_write_config_byte(pdev, ARTIM23, ctrl);
	}

	static int cmd640_init_one(struct pci_dev pdev, const struct pci_device_id id)
	{
	static const struct ata_port_info info = {
	.flags = ATA_FLAG_SLAVE_POSS,
	.pio_mask = ATA_PIO4,
	.port_ops = &cmd640_port_ops
	};
	const struct ata_port_info *ppi[] = { &info, NULL };
	int rc;

	rc = pcim_enable_device(pdev);
	if (rc)
	return rc;

	cmd640_hardware_init(pdev);

	return ata_pci_sff_init_one(pdev, ppi, &cmd640_sht, NULL, 0);
	}

	#ifdef CONFIG_PM_SLEEP
	static int cmd640_reinit_one(struct pci_dev *pdev)
	{
	struct ata_host *host = pci_get_drvdata(pdev);
	int rc;

	rc = ata_pci_device_do_resume(pdev);
	if (rc)
	return rc;
	cmd640_hardware_init(pdev);
	ata_host_resume(host);
	return 0;
	}
	#endif

	static const struct pci_device_id cmd640[] = {
	{ PCI_VDEVICE(CMD, 0x640), 0 },
	{ },
	};

	static struct pci_driver cmd640_pci_driver = {
	.name = DRV_NAME,
	.id_table = cmd640,
	.probe = cmd640_init_one,
	.remove = ata_pci_remove_one,
	#ifdef CONFIG_PM_SLEEP
	.suspend = ata_pci_device_suspend,
	.resume = cmd640_reinit_one,
	#endif
	};

	module_pci_driver(cmd640_pci_driver);

	MODULE_AUTHOR("Alan Cox");
	MODULE_DESCRIPTION("low-level driver for CMD640 PATA controllers");
	MODULE_LICENSE("GPL");
	MODULE_DEVICE_TABLE(pci, cmd640);
	MODULE_VERSION(DRV_VERSION);