Initial import

1 files changed, 347 insertions, 0 deletions

diff --git a/drivers/usb/host/ehci-orion.c b/drivers/usb/host/ehci-orion.c
new file mode 100644
index 000000000..bfcbb9aa8
--- /dev/null
+++ b/drivers/usb/host/ehci-orion.c
@@ -0,0 +1,347 @@
+/*
+ * 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)	readl_relaxed(hcd->regs + (off))
+#define wrl(off, val)	writel_relaxed((val), hcd->regs + (off))
+
+#define USB_CMD			0x140
+#define   USB_CMD_RUN		BIT(0)
+#define   USB_CMD_RESET		BIT(1)
+#define USB_MODE		0x1a8
+#define   USB_MODE_MASK		GENMASK(1, 0)
+#define   USB_MODE_DEVICE	0x2
+#define   USB_MODE_HOST		0x3
+#define   USB_MODE_SDIS		BIT(4)
+#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) | USB_CMD_RESET);
+	while (rdl(USB_CMD) & USB_CMD_RESET);
+
+	/*
+	 * 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) & ~USB_CMD_RUN);
+	wrl(USB_CMD, rdl(USB_CMD) | USB_CMD_RESET);
+	while (rdl(USB_CMD) & USB_CMD_RESET);
+
+	/*
+	 * 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, USB_MODE_SDIS | USB_MODE_HOST);
+}
+
+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;
+	}
+
+	/*
+	 * 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;
+
+	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+	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",
+		.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");