drivers/ata/ahci_qoriq.c - kernel/quantenna - Git at Google

 /*
  * Freescale QorIQ AHCI SATA platform driver
  *
  * Copyright 2015 Freescale, Inc.
  *   Tang Yuantian <Yuantian.Tang@freescale.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/kernel.h>
 #include <linux/module.h>
 #include <linux/pm.h>
 #include <linux/ahci_platform.h>
 #include <linux/device.h>
 #include <linux/of_address.h>
 #include <linux/of.h>
 #include <linux/of_device.h>
 #include <linux/platform_device.h>
 #include <linux/libata.h>
 #include "ahci.h"

 #define DRV_NAME "ahci-qoriq"

 /* port register definition */
 #define PORT_PHY1	0xA8
 #define PORT_PHY2	0xAC
 #define PORT_PHY3	0xB0
 #define PORT_PHY4	0xB4
 #define PORT_PHY5	0xB8
 #define PORT_TRANS	0xC8

 /* port register default value */
 #define AHCI_PORT_PHY_1_CFG	0xa003fffe
 #define AHCI_PORT_TRANS_CFG	0x08000029

 /* for ls1021a */
 #define LS1021A_PORT_PHY2	0x28183414
 #define LS1021A_PORT_PHY3	0x0e080e06
 #define LS1021A_PORT_PHY4	0x064a080b
 #define LS1021A_PORT_PHY5	0x2aa86470

 #define SATA_ECC_DISABLE	0x00020000

 /* for ls1043a */
 #define LS1043A_PORT_PHY2	0x28184d1f
 #define LS1043A_PORT_PHY3	0x0e081509

 enum ahci_qoriq_type {
 	AHCI_LS1021A,
 	AHCI_LS1043A,
 	AHCI_LS2080A,
 };

 struct ahci_qoriq_priv {
 	struct ccsr_ahci *reg_base;
 	enum ahci_qoriq_type type;
 	void __iomem *ecc_addr;
 };

 static const struct of_device_id ahci_qoriq_of_match[] = {
 	{ .compatible = "fsl,ls1021a-ahci", .data = (void *)AHCI_LS1021A},
 	{ .compatible = "fsl,ls1043a-ahci", .data = (void *)AHCI_LS1043A},
 	{ .compatible = "fsl,ls2080a-ahci", .data = (void *)AHCI_LS2080A},
 	{},
 };
 MODULE_DEVICE_TABLE(of, ahci_qoriq_of_match);

 static int ahci_qoriq_hardreset(struct ata_link *link, unsigned int *class,
 			  unsigned long deadline)
 {
 	const unsigned long *timing = sata_ehc_deb_timing(&link->eh_context);
 	void __iomem *port_mmio = ahci_port_base(link->ap);
 	u32 px_cmd, px_is, px_val;
 	struct ata_port *ap = link->ap;
 	struct ahci_port_priv *pp = ap->private_data;
 	struct ahci_host_priv *hpriv = ap->host->private_data;
 	struct ahci_qoriq_priv *qoriq_priv = hpriv->plat_data;
 	u8 *d2h_fis = pp->rx_fis + RX_FIS_D2H_REG;
 	struct ata_taskfile tf;
 	bool online;
 	int rc;
 	bool ls1021a_workaround = (qoriq_priv->type == AHCI_LS1021A);

 	DPRINTK("ENTER\n");

 	ahci_stop_engine(ap);

 	/*
 	 * There is a errata on ls1021a Rev1.0 and Rev2.0 which is:
 	 * A-009042: The device detection initialization sequence
 	 * mistakenly resets some registers.
 	 *
 	 * Workaround for this is:
 	 * The software should read and store PxCMD and PxIS values
 	 * before issuing the device detection initialization sequence.
 	 * After the sequence is complete, software should restore the
 	 * PxCMD and PxIS with the stored values.
 	 */
 	if (ls1021a_workaround) {
 		px_cmd = readl(port_mmio + PORT_CMD);
 		px_is = readl(port_mmio + PORT_IRQ_STAT);
 	}

 	/* clear D2H reception area to properly wait for D2H FIS */
 	ata_tf_init(link->device, &tf);
 	tf.command = ATA_BUSY;
 	ata_tf_to_fis(&tf, 0, 0, d2h_fis);

 	rc = sata_link_hardreset(link, timing, deadline, &online,
 				 ahci_check_ready);

 	/* restore the PxCMD and PxIS on ls1021 */
 	if (ls1021a_workaround) {
 		px_val = readl(port_mmio + PORT_CMD);
 		if (px_val != px_cmd)
 			writel(px_cmd, port_mmio + PORT_CMD);

 		px_val = readl(port_mmio + PORT_IRQ_STAT);
 		if (px_val != px_is)
 			writel(px_is, port_mmio + PORT_IRQ_STAT);
 	}

 	hpriv->start_engine(ap);

 	if (online)
 		*class = ahci_dev_classify(ap);

 	DPRINTK("EXIT, rc=%d, class=%u\n", rc, *class);
 	return rc;
 }

 static struct ata_port_operations ahci_qoriq_ops = {
 	.inherits	= &ahci_ops,
 	.hardreset	= ahci_qoriq_hardreset,
 };

 static struct ata_port_info ahci_qoriq_port_info = {
 	.flags		= AHCI_FLAG_COMMON | ATA_FLAG_NCQ,
 	.pio_mask	= ATA_PIO4,
 	.udma_mask	= ATA_UDMA6,
 	.port_ops	= &ahci_qoriq_ops,
 };

 static struct scsi_host_template ahci_qoriq_sht = {
 	AHCI_SHT(DRV_NAME),
 };

 static int ahci_qoriq_phy_init(struct ahci_host_priv *hpriv)
 {
 	struct ahci_qoriq_priv *qpriv = hpriv->plat_data;
 	void __iomem *reg_base = hpriv->mmio;

 	switch (qpriv->type) {
 	case AHCI_LS1021A:
 		writel(SATA_ECC_DISABLE, qpriv->ecc_addr);
 		writel(AHCI_PORT_PHY_1_CFG, reg_base + PORT_PHY1);
 		writel(LS1021A_PORT_PHY2, reg_base + PORT_PHY2);
 		writel(LS1021A_PORT_PHY3, reg_base + PORT_PHY3);
 		writel(LS1021A_PORT_PHY4, reg_base + PORT_PHY4);
 		writel(LS1021A_PORT_PHY5, reg_base + PORT_PHY5);
 		writel(AHCI_PORT_TRANS_CFG, reg_base + PORT_TRANS);
 		break;

 	case AHCI_LS1043A:
 		writel(AHCI_PORT_PHY_1_CFG, reg_base + PORT_PHY1);
 		writel(LS1043A_PORT_PHY2, reg_base + PORT_PHY2);
 		writel(LS1043A_PORT_PHY3, reg_base + PORT_PHY3);
 		writel(AHCI_PORT_TRANS_CFG, reg_base + PORT_TRANS);
 		break;

 	case AHCI_LS2080A:
 		writel(AHCI_PORT_PHY_1_CFG, reg_base + PORT_PHY1);
 		writel(AHCI_PORT_TRANS_CFG, reg_base + PORT_TRANS);
 		break;
 	}

 	return 0;
 }

 static int ahci_qoriq_probe(struct platform_device *pdev)
 {
 	struct device_node *np = pdev->dev.of_node;
 	struct device *dev = &pdev->dev;
 	struct ahci_host_priv *hpriv;
 	struct ahci_qoriq_priv *qoriq_priv;
 	const struct of_device_id *of_id;
 	struct resource *res;
 	int rc;

 	hpriv = ahci_platform_get_resources(pdev);
 	if (IS_ERR(hpriv))
 		return PTR_ERR(hpriv);

 	of_id = of_match_node(ahci_qoriq_of_match, np);
 	if (!of_id)
 		return -ENODEV;

 	qoriq_priv = devm_kzalloc(dev, sizeof(*qoriq_priv), GFP_KERNEL);
 	if (!qoriq_priv)
 		return -ENOMEM;

 	qoriq_priv->type = (enum ahci_qoriq_type)of_id->data;

 	if (qoriq_priv->type == AHCI_LS1021A) {
 		res = platform_get_resource_byname(pdev, IORESOURCE_MEM,
 				"sata-ecc");
 		qoriq_priv->ecc_addr = devm_ioremap_resource(dev, res);
 		if (IS_ERR(qoriq_priv->ecc_addr))
 			return PTR_ERR(qoriq_priv->ecc_addr);
 	}

 	rc = ahci_platform_enable_resources(hpriv);
 	if (rc)
 		return rc;

 	hpriv->plat_data = qoriq_priv;
 	rc = ahci_qoriq_phy_init(hpriv);
 	if (rc)
 		goto disable_resources;

 	/* Workaround for ls2080a */
 	if (qoriq_priv->type == AHCI_LS2080A) {
 		hpriv->flags |= AHCI_HFLAG_NO_NCQ;
 		ahci_qoriq_port_info.flags &= ~ATA_FLAG_NCQ;
 	}

 	rc = ahci_platform_init_host(pdev, hpriv, &ahci_qoriq_port_info,
 				     &ahci_qoriq_sht);
 	if (rc)
 		goto disable_resources;

 	return 0;

 disable_resources:
 	ahci_platform_disable_resources(hpriv);

 	return rc;
 }

 #ifdef CONFIG_PM_SLEEP
 static int ahci_qoriq_resume(struct device *dev)
 {
 	struct ata_host *host = dev_get_drvdata(dev);
 	struct ahci_host_priv *hpriv = host->private_data;
 	int rc;

 	rc = ahci_platform_enable_resources(hpriv);
 	if (rc)
 		return rc;

 	rc = ahci_qoriq_phy_init(hpriv);
 	if (rc)
 		goto disable_resources;

 	rc = ahci_platform_resume_host(dev);
 	if (rc)
 		goto disable_resources;

 	/* We resumed so update PM runtime state */
 	pm_runtime_disable(dev);
 	pm_runtime_set_active(dev);
 	pm_runtime_enable(dev);

 	return 0;

 disable_resources:
 	ahci_platform_disable_resources(hpriv);

 	return rc;
 }
 #endif

 static SIMPLE_DEV_PM_OPS(ahci_qoriq_pm_ops, ahci_platform_suspend,
 			 ahci_qoriq_resume);

 static struct platform_driver ahci_qoriq_driver = {
 	.probe = ahci_qoriq_probe,
 	.remove = ata_platform_remove_one,
 	.driver = {
 		.name = DRV_NAME,
 		.of_match_table = ahci_qoriq_of_match,
 		.pm = &ahci_qoriq_pm_ops,
 	},
 };
 module_platform_driver(ahci_qoriq_driver);

 MODULE_DESCRIPTION("Freescale QorIQ AHCI SATA platform driver");
 MODULE_AUTHOR("Tang Yuantian <Yuantian.Tang@freescale.com>");
 MODULE_LICENSE("GPL");
	/*
	* Freescale QorIQ AHCI SATA platform driver
	*
	* Copyright 2015 Freescale, Inc.
	* Tang Yuantian <Yuantian.Tang@freescale.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/kernel.h>
	#include <linux/module.h>
	#include <linux/pm.h>
	#include <linux/ahci_platform.h>
	#include <linux/device.h>
	#include <linux/of_address.h>
	#include <linux/of.h>
	#include <linux/of_device.h>
	#include <linux/platform_device.h>
	#include <linux/libata.h>
	#include "ahci.h"

	#define DRV_NAME "ahci-qoriq"

	/* port register definition */
	#define PORT_PHY1 0xA8
	#define PORT_PHY2 0xAC
	#define PORT_PHY3 0xB0
	#define PORT_PHY4 0xB4
	#define PORT_PHY5 0xB8
	#define PORT_TRANS 0xC8

	/* port register default value */
	#define AHCI_PORT_PHY_1_CFG 0xa003fffe
	#define AHCI_PORT_TRANS_CFG 0x08000029

	/* for ls1021a */
	#define LS1021A_PORT_PHY2 0x28183414
	#define LS1021A_PORT_PHY3 0x0e080e06
	#define LS1021A_PORT_PHY4 0x064a080b
	#define LS1021A_PORT_PHY5 0x2aa86470

	#define SATA_ECC_DISABLE 0x00020000

	/* for ls1043a */
	#define LS1043A_PORT_PHY2 0x28184d1f
	#define LS1043A_PORT_PHY3 0x0e081509

	enum ahci_qoriq_type {
	AHCI_LS1021A,
	AHCI_LS1043A,
	AHCI_LS2080A,
	};

	struct ahci_qoriq_priv {
	struct ccsr_ahci *reg_base;
	enum ahci_qoriq_type type;
	void __iomem *ecc_addr;
	};

	static const struct of_device_id ahci_qoriq_of_match[] = {
	{ .compatible = "fsl,ls1021a-ahci", .data = (void *)AHCI_LS1021A},
	{ .compatible = "fsl,ls1043a-ahci", .data = (void *)AHCI_LS1043A},
	{ .compatible = "fsl,ls2080a-ahci", .data = (void *)AHCI_LS2080A},
	{},
	};
	MODULE_DEVICE_TABLE(of, ahci_qoriq_of_match);

	static int ahci_qoriq_hardreset(struct ata_link link, unsigned int class,
	unsigned long deadline)
	{
	const unsigned long *timing = sata_ehc_deb_timing(&link->eh_context);
	void __iomem *port_mmio = ahci_port_base(link->ap);
	u32 px_cmd, px_is, px_val;
	struct ata_port *ap = link->ap;
	struct ahci_port_priv *pp = ap->private_data;
	struct ahci_host_priv *hpriv = ap->host->private_data;
	struct ahci_qoriq_priv *qoriq_priv = hpriv->plat_data;
	u8 *d2h_fis = pp->rx_fis + RX_FIS_D2H_REG;
	struct ata_taskfile tf;
	bool online;
	int rc;
	bool ls1021a_workaround = (qoriq_priv->type == AHCI_LS1021A);

	DPRINTK("ENTER\n");

	ahci_stop_engine(ap);

	/*
	* There is a errata on ls1021a Rev1.0 and Rev2.0 which is:
	* A-009042: The device detection initialization sequence
	* mistakenly resets some registers.
	*
	* Workaround for this is:
	* The software should read and store PxCMD and PxIS values
	* before issuing the device detection initialization sequence.
	* After the sequence is complete, software should restore the
	* PxCMD and PxIS with the stored values.
	*/
	if (ls1021a_workaround) {
	px_cmd = readl(port_mmio + PORT_CMD);
	px_is = readl(port_mmio + PORT_IRQ_STAT);
	}

	/* clear D2H reception area to properly wait for D2H FIS */
	ata_tf_init(link->device, &tf);
	tf.command = ATA_BUSY;
	ata_tf_to_fis(&tf, 0, 0, d2h_fis);

	rc = sata_link_hardreset(link, timing, deadline, &online,
	ahci_check_ready);

	/* restore the PxCMD and PxIS on ls1021 */
	if (ls1021a_workaround) {
	px_val = readl(port_mmio + PORT_CMD);
	if (px_val != px_cmd)
	writel(px_cmd, port_mmio + PORT_CMD);

	px_val = readl(port_mmio + PORT_IRQ_STAT);
	if (px_val != px_is)
	writel(px_is, port_mmio + PORT_IRQ_STAT);
	}

	hpriv->start_engine(ap);

	if (online)
	*class = ahci_dev_classify(ap);

	DPRINTK("EXIT, rc=%d, class=%u\n", rc, *class);
	return rc;
	}

	static struct ata_port_operations ahci_qoriq_ops = {
	.inherits = &ahci_ops,
	.hardreset = ahci_qoriq_hardreset,
	};

	static struct ata_port_info ahci_qoriq_port_info = {
	.flags = AHCI_FLAG_COMMON \| ATA_FLAG_NCQ,
	.pio_mask = ATA_PIO4,
	.udma_mask = ATA_UDMA6,
	.port_ops = &ahci_qoriq_ops,
	};

	static struct scsi_host_template ahci_qoriq_sht = {
	AHCI_SHT(DRV_NAME),
	};

	static int ahci_qoriq_phy_init(struct ahci_host_priv *hpriv)
	{
	struct ahci_qoriq_priv *qpriv = hpriv->plat_data;
	void __iomem *reg_base = hpriv->mmio;

	switch (qpriv->type) {
	case AHCI_LS1021A:
	writel(SATA_ECC_DISABLE, qpriv->ecc_addr);
	writel(AHCI_PORT_PHY_1_CFG, reg_base + PORT_PHY1);
	writel(LS1021A_PORT_PHY2, reg_base + PORT_PHY2);
	writel(LS1021A_PORT_PHY3, reg_base + PORT_PHY3);
	writel(LS1021A_PORT_PHY4, reg_base + PORT_PHY4);
	writel(LS1021A_PORT_PHY5, reg_base + PORT_PHY5);
	writel(AHCI_PORT_TRANS_CFG, reg_base + PORT_TRANS);
	break;

	case AHCI_LS1043A:
	writel(AHCI_PORT_PHY_1_CFG, reg_base + PORT_PHY1);
	writel(LS1043A_PORT_PHY2, reg_base + PORT_PHY2);
	writel(LS1043A_PORT_PHY3, reg_base + PORT_PHY3);
	writel(AHCI_PORT_TRANS_CFG, reg_base + PORT_TRANS);
	break;

	case AHCI_LS2080A:
	writel(AHCI_PORT_PHY_1_CFG, reg_base + PORT_PHY1);
	writel(AHCI_PORT_TRANS_CFG, reg_base + PORT_TRANS);
	break;
	}

	return 0;
	}

	static int ahci_qoriq_probe(struct platform_device *pdev)
	{
	struct device_node *np = pdev->dev.of_node;
	struct device *dev = &pdev->dev;
	struct ahci_host_priv *hpriv;
	struct ahci_qoriq_priv *qoriq_priv;
	const struct of_device_id *of_id;
	struct resource *res;
	int rc;

	hpriv = ahci_platform_get_resources(pdev);
	if (IS_ERR(hpriv))
	return PTR_ERR(hpriv);

	of_id = of_match_node(ahci_qoriq_of_match, np);
	if (!of_id)
	return -ENODEV;

	qoriq_priv = devm_kzalloc(dev, sizeof(*qoriq_priv), GFP_KERNEL);
	if (!qoriq_priv)
	return -ENOMEM;

	qoriq_priv->type = (enum ahci_qoriq_type)of_id->data;

	if (qoriq_priv->type == AHCI_LS1021A) {
	res = platform_get_resource_byname(pdev, IORESOURCE_MEM,
	"sata-ecc");
	qoriq_priv->ecc_addr = devm_ioremap_resource(dev, res);
	if (IS_ERR(qoriq_priv->ecc_addr))
	return PTR_ERR(qoriq_priv->ecc_addr);
	}

	rc = ahci_platform_enable_resources(hpriv);
	if (rc)
	return rc;

	hpriv->plat_data = qoriq_priv;
	rc = ahci_qoriq_phy_init(hpriv);
	if (rc)
	goto disable_resources;

	/* Workaround for ls2080a */
	if (qoriq_priv->type == AHCI_LS2080A) {
	hpriv->flags \|= AHCI_HFLAG_NO_NCQ;
	ahci_qoriq_port_info.flags &= ~ATA_FLAG_NCQ;
	}

	rc = ahci_platform_init_host(pdev, hpriv, &ahci_qoriq_port_info,
	&ahci_qoriq_sht);
	if (rc)
	goto disable_resources;

	return 0;

	disable_resources:
	ahci_platform_disable_resources(hpriv);

	return rc;
	}

	#ifdef CONFIG_PM_SLEEP
	static int ahci_qoriq_resume(struct device *dev)
	{
	struct ata_host *host = dev_get_drvdata(dev);
	struct ahci_host_priv *hpriv = host->private_data;
	int rc;

	rc = ahci_platform_enable_resources(hpriv);
	if (rc)
	return rc;

	rc = ahci_qoriq_phy_init(hpriv);
	if (rc)
	goto disable_resources;

	rc = ahci_platform_resume_host(dev);
	if (rc)
	goto disable_resources;

	/* We resumed so update PM runtime state */
	pm_runtime_disable(dev);
	pm_runtime_set_active(dev);
	pm_runtime_enable(dev);

	return 0;

	disable_resources:
	ahci_platform_disable_resources(hpriv);

	return rc;
	}
	#endif

	static SIMPLE_DEV_PM_OPS(ahci_qoriq_pm_ops, ahci_platform_suspend,
	ahci_qoriq_resume);

	static struct platform_driver ahci_qoriq_driver = {
	.probe = ahci_qoriq_probe,
	.remove = ata_platform_remove_one,
	.driver = {
	.name = DRV_NAME,
	.of_match_table = ahci_qoriq_of_match,
	.pm = &ahci_qoriq_pm_ops,
	},
	};
	module_platform_driver(ahci_qoriq_driver);

	MODULE_DESCRIPTION("Freescale QorIQ AHCI SATA platform driver");
	MODULE_AUTHOR("Tang Yuantian <Yuantian.Tang@freescale.com>");
	MODULE_LICENSE("GPL");