drivers/ata/ahci_platform.c - kernel/msm-4.9 - Gitiles

 /*
  * AHCI SATA platform driver
  *
  * Copyright 2004-2005  Red Hat, Inc.
  *   Jeff Garzik <jgarzik@pobox.com>
  * Copyright 2010  MontaVista Software, LLC.
  *   Anton Vorontsov <avorontsov@ru.mvista.com>
  *
  * This program is free software; you can redistribute it and/or modify
  * it under the terms of the GNU General Public License as published by
  * the Free Software Foundation; either version 2, or (at your option)
  * any later version.
  */

 #include <linux/clk.h>
 #include <linux/kernel.h>
 #include <linux/gfp.h>
 #include <linux/module.h>
 #include <linux/pm.h>
 #include <linux/init.h>
 #include <linux/interrupt.h>
 #include <linux/device.h>
 #include <linux/platform_device.h>
 #include <linux/libata.h>
 #include <linux/ahci_platform.h>
 #include "ahci.h"

 static void ahci_host_stop(struct ata_host *host);

 enum ahci_type {
 	AHCI,		/* standard platform ahci */
 	IMX53_AHCI,	/* ahci on i.mx53 */
 	STRICT_AHCI,	/* delayed DMA engine start */
 };

 static struct platform_device_id ahci_devtype[] = {
 	{
 		.name = "ahci",
 		.driver_data = AHCI,
 	}, {
 		.name = "imx53-ahci",
 		.driver_data = IMX53_AHCI,
 	}, {
 		.name = "strict-ahci",
 		.driver_data = STRICT_AHCI,
 	}, {
 		/* sentinel */
 	}
 };
 MODULE_DEVICE_TABLE(platform, ahci_devtype);

 static struct ata_port_operations ahci_platform_ops = {
 	.inherits	= &ahci_ops,
 	.host_stop	= ahci_host_stop,
 };

 static struct ata_port_operations ahci_platform_retry_srst_ops = {
 	.inherits	= &ahci_pmp_retry_srst_ops,
 	.host_stop	= ahci_host_stop,
 };

 static const struct ata_port_info ahci_port_info[] = {
 	/* by features */
 	[AHCI] = {
 		.flags		= AHCI_FLAG_COMMON,
 		.pio_mask	= ATA_PIO4,
 		.udma_mask	= ATA_UDMA6,
 		.port_ops	= &ahci_platform_ops,
 	},
 	[IMX53_AHCI] = {
 		.flags		= AHCI_FLAG_COMMON,
 		.pio_mask	= ATA_PIO4,
 		.udma_mask	= ATA_UDMA6,
 		.port_ops	= &ahci_platform_retry_srst_ops,
 	},
 	[STRICT_AHCI] = {
 		AHCI_HFLAGS	(AHCI_HFLAG_DELAY_ENGINE),
 		.flags		= AHCI_FLAG_COMMON,
 		.pio_mask	= ATA_PIO4,
 		.udma_mask	= ATA_UDMA6,
 		.port_ops	= &ahci_platform_ops,
 	},
 };

 static struct scsi_host_template ahci_platform_sht = {
 	AHCI_SHT("ahci_platform"),
 };

 static int ahci_probe(struct platform_device *pdev)
 {
 	struct device *dev = &pdev->dev;
 	struct ahci_platform_data *pdata = dev_get_platdata(dev);
 	const struct platform_device_id *id = platform_get_device_id(pdev);
 	struct ata_port_info pi = ahci_port_info[id ? id->driver_data : 0];
 	const struct ata_port_info *ppi[] = { &pi, NULL };
 	struct ahci_host_priv *hpriv;
 	struct ata_host *host;
 	struct resource *mem;
 	int irq;
 	int n_ports;
 	int i;
 	int rc;

 	mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 	if (!mem) {
 		dev_err(dev, "no mmio space\n");
 		return -EINVAL;
 	}

 	irq = platform_get_irq(pdev, 0);
 	if (irq <= 0) {
 		dev_err(dev, "no irq\n");
 		return -EINVAL;
 	}

 	if (pdata && pdata->ata_port_info)
 		pi = *pdata->ata_port_info;

 	hpriv = devm_kzalloc(dev, sizeof(*hpriv), GFP_KERNEL);
 	if (!hpriv) {
 		dev_err(dev, "can't alloc ahci_host_priv\n");
 		return -ENOMEM;
 	}

 	hpriv->flags |= (unsigned long)pi.private_data;

 	hpriv->mmio = devm_ioremap(dev, mem->start, resource_size(mem));
 	if (!hpriv->mmio) {
 		dev_err(dev, "can't map %pR\n", mem);
 		return -ENOMEM;
 	}

 	hpriv->clk = clk_get(dev, NULL);
 	if (IS_ERR(hpriv->clk)) {
 		dev_err(dev, "can't get clock\n");
 	} else {
 		rc = clk_prepare_enable(hpriv->clk);
 		if (rc) {
 			dev_err(dev, "clock prepare enable failed");
 			goto free_clk;
 		}
 	}

 	/*
 	 * Some platforms might need to prepare for mmio region access,
 	 * which could be done in the following init call. So, the mmio
 	 * region shouldn't be accessed before init (if provided) has
 	 * returned successfully.
 	 */
 	if (pdata && pdata->init) {
 		rc = pdata->init(dev, hpriv->mmio);
 		if (rc)
 			goto disable_unprepare_clk;
 	}

 	ahci_save_initial_config(dev, hpriv,
 		pdata ? pdata->force_port_map : 0,
 		pdata ? pdata->mask_port_map  : 0);

 	/* prepare host */
 	if (hpriv->cap & HOST_CAP_NCQ)
 		pi.flags |= ATA_FLAG_NCQ;

 	if (hpriv->cap & HOST_CAP_PMP)
 		pi.flags |= ATA_FLAG_PMP;

 	ahci_set_em_messages(hpriv, &pi);

 	/* CAP.NP sometimes indicate the index of the last enabled
 	 * port, at other times, that of the last possible port, so
 	 * determining the maximum port number requires looking at
 	 * both CAP.NP and port_map.
 	 */
 	n_ports = max(ahci_nr_ports(hpriv->cap), fls(hpriv->port_map));

 	host = ata_host_alloc_pinfo(dev, ppi, n_ports);
 	if (!host) {
 		rc = -ENOMEM;
 		goto pdata_exit;
 	}

 	host->private_data = hpriv;

 	if (!(hpriv->cap & HOST_CAP_SSS) || ahci_ignore_sss)
 		host->flags |= ATA_HOST_PARALLEL_SCAN;
 	else
 		printk(KERN_INFO "ahci: SSS flag set, parallel bus scan disabled\n");

 	if (pi.flags & ATA_FLAG_EM)
 		ahci_reset_em(host);

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

 		ata_port_desc(ap, "mmio %pR", mem);
 		ata_port_desc(ap, "port 0x%x", 0x100 + ap->port_no * 0x80);

 		/* set enclosure management message type */
 		if (ap->flags & ATA_FLAG_EM)
 			ap->em_message_type = hpriv->em_msg_type;

 		/* disabled/not-implemented port */
 		if (!(hpriv->port_map & (1 << i)))
 			ap->ops = &ata_dummy_port_ops;
 	}

 	rc = ahci_reset_controller(host);
 	if (rc)
 		goto pdata_exit;

 	ahci_init_controller(host);
 	ahci_print_info(host, "platform");

 	rc = ata_host_activate(host, irq, ahci_interrupt, IRQF_SHARED,
 			       &ahci_platform_sht);
 	if (rc)
 		goto pdata_exit;

 	return 0;
 pdata_exit:
 	if (pdata && pdata->exit)
 		pdata->exit(dev);
 disable_unprepare_clk:
 	if (!IS_ERR(hpriv->clk))
 		clk_disable_unprepare(hpriv->clk);
 free_clk:
 	if (!IS_ERR(hpriv->clk))
 		clk_put(hpriv->clk);
 	return rc;
 }

 static void ahci_host_stop(struct ata_host *host)
 {
 	struct device *dev = host->dev;
 	struct ahci_platform_data *pdata = dev_get_platdata(dev);
 	struct ahci_host_priv *hpriv = host->private_data;

 	if (pdata && pdata->exit)
 		pdata->exit(dev);

 	if (!IS_ERR(hpriv->clk)) {
 		clk_disable_unprepare(hpriv->clk);
 		clk_put(hpriv->clk);
 	}
 }

 #ifdef CONFIG_PM_SLEEP
 static int ahci_suspend(struct device *dev)
 {
 	struct ahci_platform_data *pdata = dev_get_platdata(dev);
 	struct ata_host *host = dev_get_drvdata(dev);
 	struct ahci_host_priv *hpriv = host->private_data;
 	void __iomem *mmio = hpriv->mmio;
 	u32 ctl;
 	int rc;

 	if (hpriv->flags & AHCI_HFLAG_NO_SUSPEND) {
 		dev_err(dev, "firmware update required for suspend/resume\n");
 		return -EIO;
 	}

 	/*
 	 * AHCI spec rev1.1 section 8.3.3:
 	 * Software must disable interrupts prior to requesting a
 	 * transition of the HBA to D3 state.
 	 */
 	ctl = readl(mmio + HOST_CTL);
 	ctl &= ~HOST_IRQ_EN;
 	writel(ctl, mmio + HOST_CTL);
 	readl(mmio + HOST_CTL); /* flush */

 	rc = ata_host_suspend(host, PMSG_SUSPEND);
 	if (rc)
 		return rc;

 	if (pdata && pdata->suspend)
 		return pdata->suspend(dev);

 	if (!IS_ERR(hpriv->clk))
 		clk_disable_unprepare(hpriv->clk);

 	return 0;
 }

 static int ahci_resume(struct device *dev)
 {
 	struct ahci_platform_data *pdata = dev_get_platdata(dev);
 	struct ata_host *host = dev_get_drvdata(dev);
 	struct ahci_host_priv *hpriv = host->private_data;
 	int rc;

 	if (!IS_ERR(hpriv->clk)) {
 		rc = clk_prepare_enable(hpriv->clk);
 		if (rc) {
 			dev_err(dev, "clock prepare enable failed");
 			return rc;
 		}
 	}

 	if (pdata && pdata->resume) {
 		rc = pdata->resume(dev);
 		if (rc)
 			goto disable_unprepare_clk;
 	}

 	if (dev->power.power_state.event == PM_EVENT_SUSPEND) {
 		rc = ahci_reset_controller(host);
 		if (rc)
 			goto disable_unprepare_clk;

 		ahci_init_controller(host);
 	}

 	ata_host_resume(host);

 	return 0;

 disable_unprepare_clk:
 	if (!IS_ERR(hpriv->clk))
 		clk_disable_unprepare(hpriv->clk);

 	return rc;
 }
 #endif

 static SIMPLE_DEV_PM_OPS(ahci_pm_ops, ahci_suspend, ahci_resume);

 static const struct of_device_id ahci_of_match[] = {
 	{ .compatible = "snps,spear-ahci", },
 	{},
 };
 MODULE_DEVICE_TABLE(of, ahci_of_match);

 static struct platform_driver ahci_driver = {
 	.probe = ahci_probe,
 	.remove = ata_platform_remove_one,
 	.driver = {
 		.name = "ahci",
 		.owner = THIS_MODULE,
 		.of_match_table = ahci_of_match,
 		.pm = &ahci_pm_ops,
 	},
 	.id_table	= ahci_devtype,
 };
 module_platform_driver(ahci_driver);

 MODULE_DESCRIPTION("AHCI SATA platform driver");
 MODULE_AUTHOR("Anton Vorontsov <avorontsov@ru.mvista.com>");
 MODULE_LICENSE("GPL");
 MODULE_ALIAS("platform:ahci");
	/*
	* AHCI SATA platform driver
	*
	* Copyright 2004-2005 Red Hat, Inc.
	* Jeff Garzik <jgarzik@pobox.com>
	* Copyright 2010 MontaVista Software, LLC.
	* Anton Vorontsov <avorontsov@ru.mvista.com>
	*
	* This program is free software; you can redistribute it and/or modify
	* it under the terms of the GNU General Public License as published by
	* the Free Software Foundation; either version 2, or (at your option)
	* any later version.
	*/

	#include <linux/clk.h>
	#include <linux/kernel.h>
	#include <linux/gfp.h>
	#include <linux/module.h>
	#include <linux/pm.h>
	#include <linux/init.h>
	#include <linux/interrupt.h>
	#include <linux/device.h>
	#include <linux/platform_device.h>
	#include <linux/libata.h>
	#include <linux/ahci_platform.h>
	#include "ahci.h"

	static void ahci_host_stop(struct ata_host *host);

	enum ahci_type {
	AHCI, /* standard platform ahci */
	IMX53_AHCI, /* ahci on i.mx53 */
	STRICT_AHCI, /* delayed DMA engine start */
	};

	static struct platform_device_id ahci_devtype[] = {
	{
	.name = "ahci",
	.driver_data = AHCI,
	}, {
	.name = "imx53-ahci",
	.driver_data = IMX53_AHCI,
	}, {
	.name = "strict-ahci",
	.driver_data = STRICT_AHCI,
	}, {
	/* sentinel */
	}
	};
	MODULE_DEVICE_TABLE(platform, ahci_devtype);

	static struct ata_port_operations ahci_platform_ops = {
	.inherits = &ahci_ops,
	.host_stop = ahci_host_stop,
	};

	static struct ata_port_operations ahci_platform_retry_srst_ops = {
	.inherits = &ahci_pmp_retry_srst_ops,
	.host_stop = ahci_host_stop,
	};

	static const struct ata_port_info ahci_port_info[] = {
	/* by features */
	[AHCI] = {
	.flags = AHCI_FLAG_COMMON,
	.pio_mask = ATA_PIO4,
	.udma_mask = ATA_UDMA6,
	.port_ops = &ahci_platform_ops,
	},
	[IMX53_AHCI] = {
	.flags = AHCI_FLAG_COMMON,
	.pio_mask = ATA_PIO4,
	.udma_mask = ATA_UDMA6,
	.port_ops = &ahci_platform_retry_srst_ops,
	},
	[STRICT_AHCI] = {
	AHCI_HFLAGS (AHCI_HFLAG_DELAY_ENGINE),
	.flags = AHCI_FLAG_COMMON,
	.pio_mask = ATA_PIO4,
	.udma_mask = ATA_UDMA6,
	.port_ops = &ahci_platform_ops,
	},
	};

	static struct scsi_host_template ahci_platform_sht = {
	AHCI_SHT("ahci_platform"),
	};

	static int ahci_probe(struct platform_device *pdev)
	{
	struct device *dev = &pdev->dev;
	struct ahci_platform_data *pdata = dev_get_platdata(dev);
	const struct platform_device_id *id = platform_get_device_id(pdev);
	struct ata_port_info pi = ahci_port_info[id ? id->driver_data : 0];
	const struct ata_port_info *ppi[] = { &pi, NULL };
	struct ahci_host_priv *hpriv;
	struct ata_host *host;
	struct resource *mem;
	int irq;
	int n_ports;
	int i;
	int rc;

	mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
	if (!mem) {
	dev_err(dev, "no mmio space\n");
	return -EINVAL;
	}

	irq = platform_get_irq(pdev, 0);
	if (irq <= 0) {
	dev_err(dev, "no irq\n");
	return -EINVAL;
	}

	if (pdata && pdata->ata_port_info)
	pi = *pdata->ata_port_info;

	hpriv = devm_kzalloc(dev, sizeof(*hpriv), GFP_KERNEL);
	if (!hpriv) {
	dev_err(dev, "can't alloc ahci_host_priv\n");
	return -ENOMEM;
	}

	hpriv->flags \|= (unsigned long)pi.private_data;

	hpriv->mmio = devm_ioremap(dev, mem->start, resource_size(mem));
	if (!hpriv->mmio) {
	dev_err(dev, "can't map %pR\n", mem);
	return -ENOMEM;
	}

	hpriv->clk = clk_get(dev, NULL);
	if (IS_ERR(hpriv->clk)) {
	dev_err(dev, "can't get clock\n");
	} else {
	rc = clk_prepare_enable(hpriv->clk);
	if (rc) {
	dev_err(dev, "clock prepare enable failed");
	goto free_clk;
	}
	}

	/*
	* Some platforms might need to prepare for mmio region access,
	* which could be done in the following init call. So, the mmio
	* region shouldn't be accessed before init (if provided) has
	* returned successfully.
	*/
	if (pdata && pdata->init) {
	rc = pdata->init(dev, hpriv->mmio);
	if (rc)
	goto disable_unprepare_clk;
	}

	ahci_save_initial_config(dev, hpriv,
	pdata ? pdata->force_port_map : 0,
	pdata ? pdata->mask_port_map : 0);

	/* prepare host */
	if (hpriv->cap & HOST_CAP_NCQ)
	pi.flags \|= ATA_FLAG_NCQ;

	if (hpriv->cap & HOST_CAP_PMP)
	pi.flags \|= ATA_FLAG_PMP;

	ahci_set_em_messages(hpriv, &pi);

	/* CAP.NP sometimes indicate the index of the last enabled
	* port, at other times, that of the last possible port, so
	* determining the maximum port number requires looking at
	* both CAP.NP and port_map.
	*/
	n_ports = max(ahci_nr_ports(hpriv->cap), fls(hpriv->port_map));

	host = ata_host_alloc_pinfo(dev, ppi, n_ports);
	if (!host) {
	rc = -ENOMEM;
	goto pdata_exit;
	}

	host->private_data = hpriv;

	if (!(hpriv->cap & HOST_CAP_SSS) \|\| ahci_ignore_sss)
	host->flags \|= ATA_HOST_PARALLEL_SCAN;
	else
	printk(KERN_INFO "ahci: SSS flag set, parallel bus scan disabled\n");

	if (pi.flags & ATA_FLAG_EM)
	ahci_reset_em(host);

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

	ata_port_desc(ap, "mmio %pR", mem);
	ata_port_desc(ap, "port 0x%x", 0x100 + ap->port_no * 0x80);

	/* set enclosure management message type */
	if (ap->flags & ATA_FLAG_EM)
	ap->em_message_type = hpriv->em_msg_type;

	/* disabled/not-implemented port */
	if (!(hpriv->port_map & (1 << i)))
	ap->ops = &ata_dummy_port_ops;
	}

	rc = ahci_reset_controller(host);
	if (rc)
	goto pdata_exit;

	ahci_init_controller(host);
	ahci_print_info(host, "platform");

	rc = ata_host_activate(host, irq, ahci_interrupt, IRQF_SHARED,
	&ahci_platform_sht);
	if (rc)
	goto pdata_exit;

	return 0;
	pdata_exit:
	if (pdata && pdata->exit)
	pdata->exit(dev);
	disable_unprepare_clk:
	if (!IS_ERR(hpriv->clk))
	clk_disable_unprepare(hpriv->clk);
	free_clk:
	if (!IS_ERR(hpriv->clk))
	clk_put(hpriv->clk);
	return rc;
	}

	static void ahci_host_stop(struct ata_host *host)
	{
	struct device *dev = host->dev;
	struct ahci_platform_data *pdata = dev_get_platdata(dev);
	struct ahci_host_priv *hpriv = host->private_data;

	if (pdata && pdata->exit)
	pdata->exit(dev);

	if (!IS_ERR(hpriv->clk)) {
	clk_disable_unprepare(hpriv->clk);
	clk_put(hpriv->clk);
	}
	}

	#ifdef CONFIG_PM_SLEEP
	static int ahci_suspend(struct device *dev)
	{
	struct ahci_platform_data *pdata = dev_get_platdata(dev);
	struct ata_host *host = dev_get_drvdata(dev);
	struct ahci_host_priv *hpriv = host->private_data;
	void __iomem *mmio = hpriv->mmio;
	u32 ctl;
	int rc;

	if (hpriv->flags & AHCI_HFLAG_NO_SUSPEND) {
	dev_err(dev, "firmware update required for suspend/resume\n");
	return -EIO;
	}

	/*
	* AHCI spec rev1.1 section 8.3.3:
	* Software must disable interrupts prior to requesting a
	* transition of the HBA to D3 state.
	*/
	ctl = readl(mmio + HOST_CTL);
	ctl &= ~HOST_IRQ_EN;
	writel(ctl, mmio + HOST_CTL);
	readl(mmio + HOST_CTL); /* flush */

	rc = ata_host_suspend(host, PMSG_SUSPEND);
	if (rc)
	return rc;

	if (pdata && pdata->suspend)
	return pdata->suspend(dev);

	if (!IS_ERR(hpriv->clk))
	clk_disable_unprepare(hpriv->clk);

	return 0;
	}

	static int ahci_resume(struct device *dev)
	{
	struct ahci_platform_data *pdata = dev_get_platdata(dev);
	struct ata_host *host = dev_get_drvdata(dev);
	struct ahci_host_priv *hpriv = host->private_data;
	int rc;

	if (!IS_ERR(hpriv->clk)) {
	rc = clk_prepare_enable(hpriv->clk);
	if (rc) {
	dev_err(dev, "clock prepare enable failed");
	return rc;
	}
	}

	if (pdata && pdata->resume) {
	rc = pdata->resume(dev);
	if (rc)
	goto disable_unprepare_clk;
	}

	if (dev->power.power_state.event == PM_EVENT_SUSPEND) {
	rc = ahci_reset_controller(host);
	if (rc)
	goto disable_unprepare_clk;

	ahci_init_controller(host);
	}

	ata_host_resume(host);

	return 0;

	disable_unprepare_clk:
	if (!IS_ERR(hpriv->clk))
	clk_disable_unprepare(hpriv->clk);

	return rc;
	}
	#endif

	static SIMPLE_DEV_PM_OPS(ahci_pm_ops, ahci_suspend, ahci_resume);

	static const struct of_device_id ahci_of_match[] = {
	{ .compatible = "snps,spear-ahci", },
	{},
	};
	MODULE_DEVICE_TABLE(of, ahci_of_match);

	static struct platform_driver ahci_driver = {
	.probe = ahci_probe,
	.remove = ata_platform_remove_one,
	.driver = {
	.name = "ahci",
	.owner = THIS_MODULE,
	.of_match_table = ahci_of_match,
	.pm = &ahci_pm_ops,
	},
	.id_table = ahci_devtype,
	};
	module_platform_driver(ahci_driver);

	MODULE_DESCRIPTION("AHCI SATA platform driver");
	MODULE_AUTHOR("Anton Vorontsov <avorontsov@ru.mvista.com>");
	MODULE_LICENSE("GPL");
	MODULE_ALIAS("platform:ahci");