drivers/usb/host/ehci-orion.c - arm/linux-arm64-legacy - Git at Google

 /*
  * drivers/usb/host/ehci-orion.c
  *
  * Tzachi Perelstein <tzachi@marvell.com>
  *
  * This file is licensed under  the terms of the GNU General Public
  * License version 2. This program is licensed "as is" without any
  * warranty of any kind, whether express or implied.
  */

 #include <linux/kernel.h>
 #include <linux/module.h>
 #include <linux/platform_device.h>
 #include <linux/mbus.h>
 #include <linux/clk.h>
 #include <linux/platform_data/usb-ehci-orion.h>
 #include <linux/of.h>
 #include <linux/phy/phy.h>
 #include <linux/of_device.h>
 #include <linux/of_irq.h>
 #include <linux/usb.h>
 #include <linux/usb/hcd.h>
 #include <linux/io.h>
 #include <linux/dma-mapping.h>

 #include "ehci.h"

 #define rdl(off)	__raw_readl(hcd->regs + (off))
 #define wrl(off, val)	__raw_writel((val), hcd->regs + (off))

 #define USB_CMD			0x140
 #define USB_MODE		0x1a8
 #define USB_CAUSE		0x310
 #define USB_MASK		0x314
 #define USB_WINDOW_CTRL(i)	(0x320 + ((i) << 4))
 #define USB_WINDOW_BASE(i)	(0x324 + ((i) << 4))
 #define USB_IPG			0x360
 #define USB_PHY_PWR_CTRL	0x400
 #define USB_PHY_TX_CTRL		0x420
 #define USB_PHY_RX_CTRL		0x430
 #define USB_PHY_IVREF_CTRL	0x440
 #define USB_PHY_TST_GRP_CTRL	0x450

 #define DRIVER_DESC "EHCI orion driver"

 #define hcd_to_orion_priv(h) ((struct orion_ehci_hcd *)hcd_to_ehci(h)->priv)

 struct orion_ehci_hcd {
 	struct clk *clk;
 	struct phy *phy;
 };

 static const char hcd_name[] = "ehci-orion";

 static struct hc_driver __read_mostly ehci_orion_hc_driver;

 /*
  * Implement Orion USB controller specification guidelines
  */
 static void orion_usb_phy_v1_setup(struct usb_hcd *hcd)
 {
 	/* The below GLs are according to the Orion Errata document */
 	/*
 	 * Clear interrupt cause and mask
 	 */
 	wrl(USB_CAUSE, 0);
 	wrl(USB_MASK, 0);

 	/*
 	 * Reset controller
 	 */
 	wrl(USB_CMD, rdl(USB_CMD) | 0x2);
 	while (rdl(USB_CMD) & 0x2);

 	/*
 	 * GL# USB-10: Set IPG for non start of frame packets
 	 * Bits[14:8]=0xc
 	 */
 	wrl(USB_IPG, (rdl(USB_IPG) & ~0x7f00) | 0xc00);

 	/*
 	 * GL# USB-9: USB 2.0 Power Control
 	 * BG_VSEL[7:6]=0x1
 	 */
 	wrl(USB_PHY_PWR_CTRL, (rdl(USB_PHY_PWR_CTRL) & ~0xc0)| 0x40);

 	/*
 	 * GL# USB-1: USB PHY Tx Control - force calibration to '8'
 	 * TXDATA_BLOCK_EN[21]=0x1, EXT_RCAL_EN[13]=0x1, IMP_CAL[6:3]=0x8
 	 */
 	wrl(USB_PHY_TX_CTRL, (rdl(USB_PHY_TX_CTRL) & ~0x78) | 0x202040);

 	/*
 	 * GL# USB-3 GL# USB-9: USB PHY Rx Control
 	 * RXDATA_BLOCK_LENGHT[31:30]=0x3, EDGE_DET_SEL[27:26]=0,
 	 * CDR_FASTLOCK_EN[21]=0, DISCON_THRESHOLD[9:8]=0, SQ_THRESH[7:4]=0x1
 	 */
 	wrl(USB_PHY_RX_CTRL, (rdl(USB_PHY_RX_CTRL) & ~0xc2003f0) | 0xc0000010);

 	/*
 	 * GL# USB-3 GL# USB-9: USB PHY IVREF Control
 	 * PLLVDD12[1:0]=0x2, RXVDD[5:4]=0x3, Reserved[19]=0
 	 */
 	wrl(USB_PHY_IVREF_CTRL, (rdl(USB_PHY_IVREF_CTRL) & ~0x80003 ) | 0x32);

 	/*
 	 * GL# USB-3 GL# USB-9: USB PHY Test Group Control
 	 * REG_FIFO_SQ_RST[15]=0
 	 */
 	wrl(USB_PHY_TST_GRP_CTRL, rdl(USB_PHY_TST_GRP_CTRL) & ~0x8000);

 	/*
 	 * Stop and reset controller
 	 */
 	wrl(USB_CMD, rdl(USB_CMD) & ~0x1);
 	wrl(USB_CMD, rdl(USB_CMD) | 0x2);
 	while (rdl(USB_CMD) & 0x2);

 	/*
 	 * GL# USB-5 Streaming disable REG_USB_MODE[4]=1
 	 * TBD: This need to be done after each reset!
 	 * GL# USB-4 Setup USB Host mode
 	 */
 	wrl(USB_MODE, 0x13);
 }

 static void
 ehci_orion_conf_mbus_windows(struct usb_hcd *hcd,
 			     const struct mbus_dram_target_info *dram)
 {
 	int i;

 	for (i = 0; i < 4; i++) {
 		wrl(USB_WINDOW_CTRL(i), 0);
 		wrl(USB_WINDOW_BASE(i), 0);
 	}

 	for (i = 0; i < dram->num_cs; i++) {
 		const struct mbus_dram_window *cs = dram->cs + i;

 		wrl(USB_WINDOW_CTRL(i), ((cs->size - 1) & 0xffff0000) |
 					(cs->mbus_attr << 8) |
 					(dram->mbus_dram_target_id << 4) | 1);
 		wrl(USB_WINDOW_BASE(i), cs->base);
 	}
 }

 static const struct ehci_driver_overrides orion_overrides __initconst = {
 	.extra_priv_size =	sizeof(struct orion_ehci_hcd),
 };

 static int ehci_orion_drv_probe(struct platform_device *pdev)
 {
 	struct orion_ehci_data *pd = dev_get_platdata(&pdev->dev);
 	const struct mbus_dram_target_info *dram;
 	struct resource *res;
 	struct usb_hcd *hcd;
 	struct ehci_hcd *ehci;
 	void __iomem *regs;
 	int irq, err;
 	enum orion_ehci_phy_ver phy_version;
 	struct orion_ehci_hcd *priv;

 	if (usb_disabled())
 		return -ENODEV;

 	pr_debug("Initializing Orion-SoC USB Host Controller\n");

 	irq = platform_get_irq(pdev, 0);
 	if (irq <= 0) {
 		dev_err(&pdev->dev,
 			"Found HC with no IRQ. Check %s setup!\n",
 			dev_name(&pdev->dev));
 		err = -ENODEV;
 		goto err;
 	}

 	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 	if (!res) {
 		dev_err(&pdev->dev,
 			"Found HC with no register addr. Check %s setup!\n",
 			dev_name(&pdev->dev));
 		err = -ENODEV;
 		goto err;
 	}

 	/*
 	 * Right now device-tree probed devices don't get dma_mask
 	 * set. Since shared usb code relies on it, set it here for
 	 * now. Once we have dma capability bindings this can go away.
 	 */
 	err = dma_coerce_mask_and_coherent(&pdev->dev, DMA_BIT_MASK(32));
 	if (err)
 		goto err;

 	regs = devm_ioremap_resource(&pdev->dev, res);
 	if (IS_ERR(regs)) {
 		err = PTR_ERR(regs);
 		goto err;
 	}

 	hcd = usb_create_hcd(&ehci_orion_hc_driver,
 			&pdev->dev, dev_name(&pdev->dev));
 	if (!hcd) {
 		err = -ENOMEM;
 		goto err;
 	}

 	hcd->rsrc_start = res->start;
 	hcd->rsrc_len = resource_size(res);
 	hcd->regs = regs;

 	ehci = hcd_to_ehci(hcd);
 	ehci->caps = hcd->regs + 0x100;
 	hcd->has_tt = 1;

 	priv = hcd_to_orion_priv(hcd);
 	/*
 	 * Not all platforms can gate the clock, so it is not an error if
 	 * the clock does not exists.
 	 */
 	priv->clk = devm_clk_get(&pdev->dev, NULL);
 	if (!IS_ERR(priv->clk))
 		clk_prepare_enable(priv->clk);

 	priv->phy = devm_phy_optional_get(&pdev->dev, "usb");
 	if (IS_ERR(priv->phy)) {
 		err = PTR_ERR(priv->phy);
 		goto err_phy_get;
 	} else {
 		err = phy_init(priv->phy);
 		if (err)
 			goto err_phy_init;

 		err = phy_power_on(priv->phy);
 		if (err)
 			goto err_phy_power_on;
 	}

 	/*
 	 * (Re-)program MBUS remapping windows if we are asked to.
 	 */
 	dram = mv_mbus_dram_info();
 	if (dram)
 		ehci_orion_conf_mbus_windows(hcd, dram);

 	/*
 	 * setup Orion USB controller.
 	 */
 	if (pdev->dev.of_node)
 		phy_version = EHCI_PHY_NA;
 	else
 		phy_version = pd->phy_version;

 	switch (phy_version) {
 	case EHCI_PHY_NA:	/* dont change USB phy settings */
 		break;
 	case EHCI_PHY_ORION:
 		orion_usb_phy_v1_setup(hcd);
 		break;
 	case EHCI_PHY_DD:
 	case EHCI_PHY_KW:
 	default:
 		dev_warn(&pdev->dev, "USB phy version isn't supported.\n");
 	}

 	err = usb_add_hcd(hcd, irq, IRQF_SHARED);
 	if (err)
 		goto err_add_hcd;

 	device_wakeup_enable(hcd->self.controller);
 	return 0;

 err_add_hcd:
 	if (!IS_ERR(priv->phy))
 		phy_power_off(priv->phy);
 err_phy_power_on:
 	if (!IS_ERR(priv->phy))
 		phy_exit(priv->phy);
 err_phy_init:
 err_phy_get:
 	if (!IS_ERR(priv->clk))
 		clk_disable_unprepare(priv->clk);
 	usb_put_hcd(hcd);
 err:
 	dev_err(&pdev->dev, "init %s fail, %d\n",
 		dev_name(&pdev->dev), err);

 	return err;
 }

 static int ehci_orion_drv_remove(struct platform_device *pdev)
 {
 	struct usb_hcd *hcd = platform_get_drvdata(pdev);
 	struct orion_ehci_hcd *priv = hcd_to_orion_priv(hcd);

 	usb_remove_hcd(hcd);

 	if (!IS_ERR(priv->phy)) {
 		phy_power_off(priv->phy);
 		phy_exit(priv->phy);
 	}

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

 	usb_put_hcd(hcd);

 	return 0;
 }

 static const struct of_device_id ehci_orion_dt_ids[] = {
 	{ .compatible = "marvell,orion-ehci", },
 	{},
 };
 MODULE_DEVICE_TABLE(of, ehci_orion_dt_ids);

 static struct platform_driver ehci_orion_driver = {
 	.probe		= ehci_orion_drv_probe,
 	.remove		= ehci_orion_drv_remove,
 	.shutdown	= usb_hcd_platform_shutdown,
 	.driver = {
 		.name	= "orion-ehci",
 		.owner  = THIS_MODULE,
 		.of_match_table = ehci_orion_dt_ids,
 	},
 };

 static int __init ehci_orion_init(void)
 {
 	if (usb_disabled())
 		return -ENODEV;

 	pr_info("%s: " DRIVER_DESC "\n", hcd_name);

 	ehci_init_driver(&ehci_orion_hc_driver, &orion_overrides);
 	return platform_driver_register(&ehci_orion_driver);
 }
 module_init(ehci_orion_init);

 static void __exit ehci_orion_cleanup(void)
 {
 	platform_driver_unregister(&ehci_orion_driver);
 }
 module_exit(ehci_orion_cleanup);

 MODULE_DESCRIPTION(DRIVER_DESC);
 MODULE_ALIAS("platform:orion-ehci");
 MODULE_AUTHOR("Tzachi Perelstein");
 MODULE_LICENSE("GPL v2");
	/*
	* drivers/usb/host/ehci-orion.c
	*
	* Tzachi Perelstein <tzachi@marvell.com>
	*
	* This file is licensed under the terms of the GNU General Public
	* License version 2. This program is licensed "as is" without any
	* warranty of any kind, whether express or implied.
	*/

	#include <linux/kernel.h>
	#include <linux/module.h>
	#include <linux/platform_device.h>
	#include <linux/mbus.h>
	#include <linux/clk.h>
	#include <linux/platform_data/usb-ehci-orion.h>
	#include <linux/of.h>
	#include <linux/phy/phy.h>
	#include <linux/of_device.h>
	#include <linux/of_irq.h>
	#include <linux/usb.h>
	#include <linux/usb/hcd.h>
	#include <linux/io.h>
	#include <linux/dma-mapping.h>

	#include "ehci.h"

	#define rdl(off) __raw_readl(hcd->regs + (off))
	#define wrl(off, val) __raw_writel((val), hcd->regs + (off))

	#define USB_CMD 0x140
	#define USB_MODE 0x1a8
	#define USB_CAUSE 0x310
	#define USB_MASK 0x314
	#define USB_WINDOW_CTRL(i) (0x320 + ((i) << 4))
	#define USB_WINDOW_BASE(i) (0x324 + ((i) << 4))
	#define USB_IPG 0x360
	#define USB_PHY_PWR_CTRL 0x400
	#define USB_PHY_TX_CTRL 0x420
	#define USB_PHY_RX_CTRL 0x430
	#define USB_PHY_IVREF_CTRL 0x440
	#define USB_PHY_TST_GRP_CTRL 0x450

	#define DRIVER_DESC "EHCI orion driver"

	#define hcd_to_orion_priv(h) ((struct orion_ehci_hcd *)hcd_to_ehci(h)->priv)

	struct orion_ehci_hcd {
	struct clk *clk;
	struct phy *phy;
	};

	static const char hcd_name[] = "ehci-orion";

	static struct hc_driver __read_mostly ehci_orion_hc_driver;

	/*
	* Implement Orion USB controller specification guidelines
	*/
	static void orion_usb_phy_v1_setup(struct usb_hcd *hcd)
	{
	/* The below GLs are according to the Orion Errata document */
	/*
	* Clear interrupt cause and mask
	*/
	wrl(USB_CAUSE, 0);
	wrl(USB_MASK, 0);

	/*
	* Reset controller
	*/
	wrl(USB_CMD, rdl(USB_CMD) \| 0x2);
	while (rdl(USB_CMD) & 0x2);

	/*
	* GL# USB-10: Set IPG for non start of frame packets
	* Bits[14:8]=0xc
	*/
	wrl(USB_IPG, (rdl(USB_IPG) & ~0x7f00) \| 0xc00);

	/*
	* GL# USB-9: USB 2.0 Power Control
	* BG_VSEL[7:6]=0x1
	*/
	wrl(USB_PHY_PWR_CTRL, (rdl(USB_PHY_PWR_CTRL) & ~0xc0)\| 0x40);

	/*
	* GL# USB-1: USB PHY Tx Control - force calibration to '8'
	* TXDATA_BLOCK_EN[21]=0x1, EXT_RCAL_EN[13]=0x1, IMP_CAL[6:3]=0x8
	*/
	wrl(USB_PHY_TX_CTRL, (rdl(USB_PHY_TX_CTRL) & ~0x78) \| 0x202040);

	/*
	* GL# USB-3 GL# USB-9: USB PHY Rx Control
	* RXDATA_BLOCK_LENGHT[31:30]=0x3, EDGE_DET_SEL[27:26]=0,
	* CDR_FASTLOCK_EN[21]=0, DISCON_THRESHOLD[9:8]=0, SQ_THRESH[7:4]=0x1
	*/
	wrl(USB_PHY_RX_CTRL, (rdl(USB_PHY_RX_CTRL) & ~0xc2003f0) \| 0xc0000010);

	/*
	* GL# USB-3 GL# USB-9: USB PHY IVREF Control
	* PLLVDD12[1:0]=0x2, RXVDD[5:4]=0x3, Reserved[19]=0
	*/
	wrl(USB_PHY_IVREF_CTRL, (rdl(USB_PHY_IVREF_CTRL) & ~0x80003 ) \| 0x32);

	/*
	* GL# USB-3 GL# USB-9: USB PHY Test Group Control
	* REG_FIFO_SQ_RST[15]=0
	*/
	wrl(USB_PHY_TST_GRP_CTRL, rdl(USB_PHY_TST_GRP_CTRL) & ~0x8000);

	/*
	* Stop and reset controller
	*/
	wrl(USB_CMD, rdl(USB_CMD) & ~0x1);
	wrl(USB_CMD, rdl(USB_CMD) \| 0x2);
	while (rdl(USB_CMD) & 0x2);

	/*
	* GL# USB-5 Streaming disable REG_USB_MODE[4]=1
	* TBD: This need to be done after each reset!
	* GL# USB-4 Setup USB Host mode
	*/
	wrl(USB_MODE, 0x13);
	}

	static void
	ehci_orion_conf_mbus_windows(struct usb_hcd *hcd,
	const struct mbus_dram_target_info *dram)
	{
	int i;

	for (i = 0; i < 4; i++) {
	wrl(USB_WINDOW_CTRL(i), 0);
	wrl(USB_WINDOW_BASE(i), 0);
	}

	for (i = 0; i < dram->num_cs; i++) {
	const struct mbus_dram_window *cs = dram->cs + i;

	wrl(USB_WINDOW_CTRL(i), ((cs->size - 1) & 0xffff0000) \|
	(cs->mbus_attr << 8) \|
	(dram->mbus_dram_target_id << 4) \| 1);
	wrl(USB_WINDOW_BASE(i), cs->base);
	}
	}

	static const struct ehci_driver_overrides orion_overrides __initconst = {
	.extra_priv_size = sizeof(struct orion_ehci_hcd),
	};

	static int ehci_orion_drv_probe(struct platform_device *pdev)
	{
	struct orion_ehci_data *pd = dev_get_platdata(&pdev->dev);
	const struct mbus_dram_target_info *dram;
	struct resource *res;
	struct usb_hcd *hcd;
	struct ehci_hcd *ehci;
	void __iomem *regs;
	int irq, err;
	enum orion_ehci_phy_ver phy_version;
	struct orion_ehci_hcd *priv;

	if (usb_disabled())
	return -ENODEV;

	pr_debug("Initializing Orion-SoC USB Host Controller\n");

	irq = platform_get_irq(pdev, 0);
	if (irq <= 0) {
	dev_err(&pdev->dev,
	"Found HC with no IRQ. Check %s setup!\n",
	dev_name(&pdev->dev));
	err = -ENODEV;
	goto err;
	}

	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
	if (!res) {
	dev_err(&pdev->dev,
	"Found HC with no register addr. Check %s setup!\n",
	dev_name(&pdev->dev));
	err = -ENODEV;
	goto err;
	}

	/*
	* Right now device-tree probed devices don't get dma_mask
	* set. Since shared usb code relies on it, set it here for
	* now. Once we have dma capability bindings this can go away.
	*/
	err = dma_coerce_mask_and_coherent(&pdev->dev, DMA_BIT_MASK(32));
	if (err)
	goto err;

	regs = devm_ioremap_resource(&pdev->dev, res);
	if (IS_ERR(regs)) {
	err = PTR_ERR(regs);
	goto err;
	}

	hcd = usb_create_hcd(&ehci_orion_hc_driver,
	&pdev->dev, dev_name(&pdev->dev));
	if (!hcd) {
	err = -ENOMEM;
	goto err;
	}

	hcd->rsrc_start = res->start;
	hcd->rsrc_len = resource_size(res);
	hcd->regs = regs;

	ehci = hcd_to_ehci(hcd);
	ehci->caps = hcd->regs + 0x100;
	hcd->has_tt = 1;

	priv = hcd_to_orion_priv(hcd);
	/*
	* Not all platforms can gate the clock, so it is not an error if
	* the clock does not exists.
	*/
	priv->clk = devm_clk_get(&pdev->dev, NULL);
	if (!IS_ERR(priv->clk))
	clk_prepare_enable(priv->clk);

	priv->phy = devm_phy_optional_get(&pdev->dev, "usb");
	if (IS_ERR(priv->phy)) {
	err = PTR_ERR(priv->phy);
	goto err_phy_get;
	} else {
	err = phy_init(priv->phy);
	if (err)
	goto err_phy_init;

	err = phy_power_on(priv->phy);
	if (err)
	goto err_phy_power_on;
	}

	/*
	* (Re-)program MBUS remapping windows if we are asked to.
	*/
	dram = mv_mbus_dram_info();
	if (dram)
	ehci_orion_conf_mbus_windows(hcd, dram);

	/*
	* setup Orion USB controller.
	*/
	if (pdev->dev.of_node)
	phy_version = EHCI_PHY_NA;
	else
	phy_version = pd->phy_version;

	switch (phy_version) {
	case EHCI_PHY_NA: /* dont change USB phy settings */
	break;
	case EHCI_PHY_ORION:
	orion_usb_phy_v1_setup(hcd);
	break;
	case EHCI_PHY_DD:
	case EHCI_PHY_KW:
	default:
	dev_warn(&pdev->dev, "USB phy version isn't supported.\n");
	}

	err = usb_add_hcd(hcd, irq, IRQF_SHARED);
	if (err)
	goto err_add_hcd;

	device_wakeup_enable(hcd->self.controller);
	return 0;

	err_add_hcd:
	if (!IS_ERR(priv->phy))
	phy_power_off(priv->phy);
	err_phy_power_on:
	if (!IS_ERR(priv->phy))
	phy_exit(priv->phy);
	err_phy_init:
	err_phy_get:
	if (!IS_ERR(priv->clk))
	clk_disable_unprepare(priv->clk);
	usb_put_hcd(hcd);
	err:
	dev_err(&pdev->dev, "init %s fail, %d\n",
	dev_name(&pdev->dev), err);

	return err;
	}

	static int ehci_orion_drv_remove(struct platform_device *pdev)
	{
	struct usb_hcd *hcd = platform_get_drvdata(pdev);
	struct orion_ehci_hcd *priv = hcd_to_orion_priv(hcd);

	usb_remove_hcd(hcd);

	if (!IS_ERR(priv->phy)) {
	phy_power_off(priv->phy);
	phy_exit(priv->phy);
	}

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

	usb_put_hcd(hcd);

	return 0;
	}

	static const struct of_device_id ehci_orion_dt_ids[] = {
	{ .compatible = "marvell,orion-ehci", },
	{},
	};
	MODULE_DEVICE_TABLE(of, ehci_orion_dt_ids);

	static struct platform_driver ehci_orion_driver = {
	.probe = ehci_orion_drv_probe,
	.remove = ehci_orion_drv_remove,
	.shutdown = usb_hcd_platform_shutdown,
	.driver = {
	.name = "orion-ehci",
	.owner = THIS_MODULE,
	.of_match_table = ehci_orion_dt_ids,
	},
	};

	static int __init ehci_orion_init(void)
	{
	if (usb_disabled())
	return -ENODEV;

	pr_info("%s: " DRIVER_DESC "\n", hcd_name);

	ehci_init_driver(&ehci_orion_hc_driver, &orion_overrides);
	return platform_driver_register(&ehci_orion_driver);
	}
	module_init(ehci_orion_init);

	static void __exit ehci_orion_cleanup(void)
	{
	platform_driver_unregister(&ehci_orion_driver);
	}
	module_exit(ehci_orion_cleanup);

	MODULE_DESCRIPTION(DRIVER_DESC);
	MODULE_ALIAS("platform:orion-ehci");
	MODULE_AUTHOR("Tzachi Perelstein");
	MODULE_LICENSE("GPL v2");