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path: root/drivers/usb/musb/am35x.c
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Diffstat (limited to 'drivers/usb/musb/am35x.c')
-rw-r--r--drivers/usb/musb/am35x.c610
1 files changed, 610 insertions, 0 deletions
diff --git a/drivers/usb/musb/am35x.c b/drivers/usb/musb/am35x.c
new file mode 100644
index 000000000..bf2c0fa6c
--- /dev/null
+++ b/drivers/usb/musb/am35x.c
@@ -0,0 +1,610 @@
+// SPDX-License-Identifier: GPL-2.0
+
+/*
+ * Texas Instruments AM35x "glue layer"
+ *
+ * Copyright (c) 2010, by Texas Instruments
+ *
+ * Based on the DA8xx "glue layer" code.
+ * Copyright (c) 2008-2009, MontaVista Software, Inc. <source@mvista.com>
+ *
+ * This file is part of the Inventra Controller Driver for Linux.
+ */
+
+#include <linux/module.h>
+#include <linux/clk.h>
+#include <linux/err.h>
+#include <linux/io.h>
+#include <linux/platform_device.h>
+#include <linux/dma-mapping.h>
+#include <linux/usb/usb_phy_generic.h>
+#include <linux/platform_data/usb-omap.h>
+
+#include "musb_core.h"
+
+/*
+ * AM35x specific definitions
+ */
+/* USB 2.0 OTG module registers */
+#define USB_REVISION_REG 0x00
+#define USB_CTRL_REG 0x04
+#define USB_STAT_REG 0x08
+#define USB_EMULATION_REG 0x0c
+/* 0x10 Reserved */
+#define USB_AUTOREQ_REG 0x14
+#define USB_SRP_FIX_TIME_REG 0x18
+#define USB_TEARDOWN_REG 0x1c
+#define EP_INTR_SRC_REG 0x20
+#define EP_INTR_SRC_SET_REG 0x24
+#define EP_INTR_SRC_CLEAR_REG 0x28
+#define EP_INTR_MASK_REG 0x2c
+#define EP_INTR_MASK_SET_REG 0x30
+#define EP_INTR_MASK_CLEAR_REG 0x34
+#define EP_INTR_SRC_MASKED_REG 0x38
+#define CORE_INTR_SRC_REG 0x40
+#define CORE_INTR_SRC_SET_REG 0x44
+#define CORE_INTR_SRC_CLEAR_REG 0x48
+#define CORE_INTR_MASK_REG 0x4c
+#define CORE_INTR_MASK_SET_REG 0x50
+#define CORE_INTR_MASK_CLEAR_REG 0x54
+#define CORE_INTR_SRC_MASKED_REG 0x58
+/* 0x5c Reserved */
+#define USB_END_OF_INTR_REG 0x60
+
+/* Control register bits */
+#define AM35X_SOFT_RESET_MASK 1
+
+/* USB interrupt register bits */
+#define AM35X_INTR_USB_SHIFT 16
+#define AM35X_INTR_USB_MASK (0x1ff << AM35X_INTR_USB_SHIFT)
+#define AM35X_INTR_DRVVBUS 0x100
+#define AM35X_INTR_RX_SHIFT 16
+#define AM35X_INTR_TX_SHIFT 0
+#define AM35X_TX_EP_MASK 0xffff /* EP0 + 15 Tx EPs */
+#define AM35X_RX_EP_MASK 0xfffe /* 15 Rx EPs */
+#define AM35X_TX_INTR_MASK (AM35X_TX_EP_MASK << AM35X_INTR_TX_SHIFT)
+#define AM35X_RX_INTR_MASK (AM35X_RX_EP_MASK << AM35X_INTR_RX_SHIFT)
+
+#define USB_MENTOR_CORE_OFFSET 0x400
+
+struct am35x_glue {
+ struct device *dev;
+ struct platform_device *musb;
+ struct platform_device *phy;
+ struct clk *phy_clk;
+ struct clk *clk;
+};
+
+/*
+ * am35x_musb_enable - enable interrupts
+ */
+static void am35x_musb_enable(struct musb *musb)
+{
+ void __iomem *reg_base = musb->ctrl_base;
+ u32 epmask;
+
+ /* Workaround: setup IRQs through both register sets. */
+ epmask = ((musb->epmask & AM35X_TX_EP_MASK) << AM35X_INTR_TX_SHIFT) |
+ ((musb->epmask & AM35X_RX_EP_MASK) << AM35X_INTR_RX_SHIFT);
+
+ musb_writel(reg_base, EP_INTR_MASK_SET_REG, epmask);
+ musb_writel(reg_base, CORE_INTR_MASK_SET_REG, AM35X_INTR_USB_MASK);
+
+ /* Force the DRVVBUS IRQ so we can start polling for ID change. */
+ musb_writel(reg_base, CORE_INTR_SRC_SET_REG,
+ AM35X_INTR_DRVVBUS << AM35X_INTR_USB_SHIFT);
+}
+
+/*
+ * am35x_musb_disable - disable HDRC and flush interrupts
+ */
+static void am35x_musb_disable(struct musb *musb)
+{
+ void __iomem *reg_base = musb->ctrl_base;
+
+ musb_writel(reg_base, CORE_INTR_MASK_CLEAR_REG, AM35X_INTR_USB_MASK);
+ musb_writel(reg_base, EP_INTR_MASK_CLEAR_REG,
+ AM35X_TX_INTR_MASK | AM35X_RX_INTR_MASK);
+ musb_writel(reg_base, USB_END_OF_INTR_REG, 0);
+}
+
+#define portstate(stmt) stmt
+
+static void am35x_musb_set_vbus(struct musb *musb, int is_on)
+{
+ WARN_ON(is_on && is_peripheral_active(musb));
+}
+
+#define POLL_SECONDS 2
+
+static void otg_timer(struct timer_list *t)
+{
+ struct musb *musb = from_timer(musb, t, dev_timer);
+ void __iomem *mregs = musb->mregs;
+ u8 devctl;
+ unsigned long flags;
+
+ /*
+ * We poll because AM35x's won't expose several OTG-critical
+ * status change events (from the transceiver) otherwise.
+ */
+ devctl = musb_readb(mregs, MUSB_DEVCTL);
+ dev_dbg(musb->controller, "Poll devctl %02x (%s)\n", devctl,
+ usb_otg_state_string(musb->xceiv->otg->state));
+
+ spin_lock_irqsave(&musb->lock, flags);
+ switch (musb->xceiv->otg->state) {
+ case OTG_STATE_A_WAIT_BCON:
+ devctl &= ~MUSB_DEVCTL_SESSION;
+ musb_writeb(musb->mregs, MUSB_DEVCTL, devctl);
+
+ devctl = musb_readb(musb->mregs, MUSB_DEVCTL);
+ if (devctl & MUSB_DEVCTL_BDEVICE) {
+ musb->xceiv->otg->state = OTG_STATE_B_IDLE;
+ MUSB_DEV_MODE(musb);
+ } else {
+ musb->xceiv->otg->state = OTG_STATE_A_IDLE;
+ MUSB_HST_MODE(musb);
+ }
+ break;
+ case OTG_STATE_A_WAIT_VFALL:
+ musb->xceiv->otg->state = OTG_STATE_A_WAIT_VRISE;
+ musb_writel(musb->ctrl_base, CORE_INTR_SRC_SET_REG,
+ MUSB_INTR_VBUSERROR << AM35X_INTR_USB_SHIFT);
+ break;
+ case OTG_STATE_B_IDLE:
+ devctl = musb_readb(mregs, MUSB_DEVCTL);
+ if (devctl & MUSB_DEVCTL_BDEVICE)
+ mod_timer(&musb->dev_timer, jiffies + POLL_SECONDS * HZ);
+ else
+ musb->xceiv->otg->state = OTG_STATE_A_IDLE;
+ break;
+ default:
+ break;
+ }
+ spin_unlock_irqrestore(&musb->lock, flags);
+}
+
+static void am35x_musb_try_idle(struct musb *musb, unsigned long timeout)
+{
+ static unsigned long last_timer;
+
+ if (timeout == 0)
+ timeout = jiffies + msecs_to_jiffies(3);
+
+ /* Never idle if active, or when VBUS timeout is not set as host */
+ if (musb->is_active || (musb->a_wait_bcon == 0 &&
+ musb->xceiv->otg->state == OTG_STATE_A_WAIT_BCON)) {
+ dev_dbg(musb->controller, "%s active, deleting timer\n",
+ usb_otg_state_string(musb->xceiv->otg->state));
+ del_timer(&musb->dev_timer);
+ last_timer = jiffies;
+ return;
+ }
+
+ if (time_after(last_timer, timeout) && timer_pending(&musb->dev_timer)) {
+ dev_dbg(musb->controller, "Longer idle timer already pending, ignoring...\n");
+ return;
+ }
+ last_timer = timeout;
+
+ dev_dbg(musb->controller, "%s inactive, starting idle timer for %u ms\n",
+ usb_otg_state_string(musb->xceiv->otg->state),
+ jiffies_to_msecs(timeout - jiffies));
+ mod_timer(&musb->dev_timer, timeout);
+}
+
+static irqreturn_t am35x_musb_interrupt(int irq, void *hci)
+{
+ struct musb *musb = hci;
+ void __iomem *reg_base = musb->ctrl_base;
+ struct device *dev = musb->controller;
+ struct musb_hdrc_platform_data *plat = dev_get_platdata(dev);
+ struct omap_musb_board_data *data = plat->board_data;
+ unsigned long flags;
+ irqreturn_t ret = IRQ_NONE;
+ u32 epintr, usbintr;
+
+ spin_lock_irqsave(&musb->lock, flags);
+
+ /* Get endpoint interrupts */
+ epintr = musb_readl(reg_base, EP_INTR_SRC_MASKED_REG);
+
+ if (epintr) {
+ musb_writel(reg_base, EP_INTR_SRC_CLEAR_REG, epintr);
+
+ musb->int_rx =
+ (epintr & AM35X_RX_INTR_MASK) >> AM35X_INTR_RX_SHIFT;
+ musb->int_tx =
+ (epintr & AM35X_TX_INTR_MASK) >> AM35X_INTR_TX_SHIFT;
+ }
+
+ /* Get usb core interrupts */
+ usbintr = musb_readl(reg_base, CORE_INTR_SRC_MASKED_REG);
+ if (!usbintr && !epintr)
+ goto eoi;
+
+ if (usbintr) {
+ musb_writel(reg_base, CORE_INTR_SRC_CLEAR_REG, usbintr);
+
+ musb->int_usb =
+ (usbintr & AM35X_INTR_USB_MASK) >> AM35X_INTR_USB_SHIFT;
+ }
+ /*
+ * DRVVBUS IRQs are the only proxy we have (a very poor one!) for
+ * AM35x's missing ID change IRQ. We need an ID change IRQ to
+ * switch appropriately between halves of the OTG state machine.
+ * Managing DEVCTL.SESSION per Mentor docs requires that we know its
+ * value but DEVCTL.BDEVICE is invalid without DEVCTL.SESSION set.
+ * Also, DRVVBUS pulses for SRP (but not at 5V) ...
+ */
+ if (usbintr & (AM35X_INTR_DRVVBUS << AM35X_INTR_USB_SHIFT)) {
+ int drvvbus = musb_readl(reg_base, USB_STAT_REG);
+ void __iomem *mregs = musb->mregs;
+ u8 devctl = musb_readb(mregs, MUSB_DEVCTL);
+ int err;
+
+ err = musb->int_usb & MUSB_INTR_VBUSERROR;
+ if (err) {
+ /*
+ * The Mentor core doesn't debounce VBUS as needed
+ * to cope with device connect current spikes. This
+ * means it's not uncommon for bus-powered devices
+ * to get VBUS errors during enumeration.
+ *
+ * This is a workaround, but newer RTL from Mentor
+ * seems to allow a better one: "re"-starting sessions
+ * without waiting for VBUS to stop registering in
+ * devctl.
+ */
+ musb->int_usb &= ~MUSB_INTR_VBUSERROR;
+ musb->xceiv->otg->state = OTG_STATE_A_WAIT_VFALL;
+ mod_timer(&musb->dev_timer, jiffies + POLL_SECONDS * HZ);
+ WARNING("VBUS error workaround (delay coming)\n");
+ } else if (drvvbus) {
+ MUSB_HST_MODE(musb);
+ musb->xceiv->otg->state = OTG_STATE_A_WAIT_VRISE;
+ portstate(musb->port1_status |= USB_PORT_STAT_POWER);
+ del_timer(&musb->dev_timer);
+ } else {
+ musb->is_active = 0;
+ MUSB_DEV_MODE(musb);
+ musb->xceiv->otg->state = OTG_STATE_B_IDLE;
+ portstate(musb->port1_status &= ~USB_PORT_STAT_POWER);
+ }
+
+ /* NOTE: this must complete power-on within 100 ms. */
+ dev_dbg(musb->controller, "VBUS %s (%s)%s, devctl %02x\n",
+ drvvbus ? "on" : "off",
+ usb_otg_state_string(musb->xceiv->otg->state),
+ err ? " ERROR" : "",
+ devctl);
+ ret = IRQ_HANDLED;
+ }
+
+ /* Drop spurious RX and TX if device is disconnected */
+ if (musb->int_usb & MUSB_INTR_DISCONNECT) {
+ musb->int_tx = 0;
+ musb->int_rx = 0;
+ }
+
+ if (musb->int_tx || musb->int_rx || musb->int_usb)
+ ret |= musb_interrupt(musb);
+
+eoi:
+ /* EOI needs to be written for the IRQ to be re-asserted. */
+ if (ret == IRQ_HANDLED || epintr || usbintr) {
+ /* clear level interrupt */
+ if (data->clear_irq)
+ data->clear_irq();
+ /* write EOI */
+ musb_writel(reg_base, USB_END_OF_INTR_REG, 0);
+ }
+
+ /* Poll for ID change */
+ if (musb->xceiv->otg->state == OTG_STATE_B_IDLE)
+ mod_timer(&musb->dev_timer, jiffies + POLL_SECONDS * HZ);
+
+ spin_unlock_irqrestore(&musb->lock, flags);
+
+ return ret;
+}
+
+static int am35x_musb_set_mode(struct musb *musb, u8 musb_mode)
+{
+ struct device *dev = musb->controller;
+ struct musb_hdrc_platform_data *plat = dev_get_platdata(dev);
+ struct omap_musb_board_data *data = plat->board_data;
+ int retval = 0;
+
+ if (data->set_mode)
+ data->set_mode(musb_mode);
+ else
+ retval = -EIO;
+
+ return retval;
+}
+
+static int am35x_musb_init(struct musb *musb)
+{
+ struct device *dev = musb->controller;
+ struct musb_hdrc_platform_data *plat = dev_get_platdata(dev);
+ struct omap_musb_board_data *data = plat->board_data;
+ void __iomem *reg_base = musb->ctrl_base;
+ u32 rev;
+
+ musb->mregs += USB_MENTOR_CORE_OFFSET;
+
+ /* Returns zero if e.g. not clocked */
+ rev = musb_readl(reg_base, USB_REVISION_REG);
+ if (!rev)
+ return -ENODEV;
+
+ musb->xceiv = usb_get_phy(USB_PHY_TYPE_USB2);
+ if (IS_ERR_OR_NULL(musb->xceiv))
+ return -EPROBE_DEFER;
+
+ timer_setup(&musb->dev_timer, otg_timer, 0);
+
+ /* Reset the musb */
+ if (data->reset)
+ data->reset();
+
+ /* Reset the controller */
+ musb_writel(reg_base, USB_CTRL_REG, AM35X_SOFT_RESET_MASK);
+
+ /* Start the on-chip PHY and its PLL. */
+ if (data->set_phy_power)
+ data->set_phy_power(1);
+
+ msleep(5);
+
+ musb->isr = am35x_musb_interrupt;
+
+ /* clear level interrupt */
+ if (data->clear_irq)
+ data->clear_irq();
+
+ return 0;
+}
+
+static int am35x_musb_exit(struct musb *musb)
+{
+ struct device *dev = musb->controller;
+ struct musb_hdrc_platform_data *plat = dev_get_platdata(dev);
+ struct omap_musb_board_data *data = plat->board_data;
+
+ del_timer_sync(&musb->dev_timer);
+
+ /* Shutdown the on-chip PHY and its PLL. */
+ if (data->set_phy_power)
+ data->set_phy_power(0);
+
+ usb_put_phy(musb->xceiv);
+
+ return 0;
+}
+
+/* AM35x supports only 32bit read operation */
+static void am35x_read_fifo(struct musb_hw_ep *hw_ep, u16 len, u8 *dst)
+{
+ void __iomem *fifo = hw_ep->fifo;
+ u32 val;
+ int i;
+
+ /* Read for 32bit-aligned destination address */
+ if (likely((0x03 & (unsigned long) dst) == 0) && len >= 4) {
+ readsl(fifo, dst, len >> 2);
+ dst += len & ~0x03;
+ len &= 0x03;
+ }
+ /*
+ * Now read the remaining 1 to 3 byte or complete length if
+ * unaligned address.
+ */
+ if (len > 4) {
+ for (i = 0; i < (len >> 2); i++) {
+ *(u32 *) dst = musb_readl(fifo, 0);
+ dst += 4;
+ }
+ len &= 0x03;
+ }
+ if (len > 0) {
+ val = musb_readl(fifo, 0);
+ memcpy(dst, &val, len);
+ }
+}
+
+static const struct musb_platform_ops am35x_ops = {
+ .quirks = MUSB_DMA_INVENTRA | MUSB_INDEXED_EP,
+ .init = am35x_musb_init,
+ .exit = am35x_musb_exit,
+
+ .read_fifo = am35x_read_fifo,
+#ifdef CONFIG_USB_INVENTRA_DMA
+ .dma_init = musbhs_dma_controller_create,
+ .dma_exit = musbhs_dma_controller_destroy,
+#endif
+ .enable = am35x_musb_enable,
+ .disable = am35x_musb_disable,
+
+ .set_mode = am35x_musb_set_mode,
+ .try_idle = am35x_musb_try_idle,
+
+ .set_vbus = am35x_musb_set_vbus,
+};
+
+static const struct platform_device_info am35x_dev_info = {
+ .name = "musb-hdrc",
+ .id = PLATFORM_DEVID_AUTO,
+ .dma_mask = DMA_BIT_MASK(32),
+};
+
+static int am35x_probe(struct platform_device *pdev)
+{
+ struct musb_hdrc_platform_data *pdata = dev_get_platdata(&pdev->dev);
+ struct platform_device *musb;
+ struct am35x_glue *glue;
+ struct platform_device_info pinfo;
+ struct clk *phy_clk;
+ struct clk *clk;
+
+ int ret = -ENOMEM;
+
+ glue = kzalloc(sizeof(*glue), GFP_KERNEL);
+ if (!glue)
+ goto err0;
+
+ phy_clk = clk_get(&pdev->dev, "fck");
+ if (IS_ERR(phy_clk)) {
+ dev_err(&pdev->dev, "failed to get PHY clock\n");
+ ret = PTR_ERR(phy_clk);
+ goto err3;
+ }
+
+ clk = clk_get(&pdev->dev, "ick");
+ if (IS_ERR(clk)) {
+ dev_err(&pdev->dev, "failed to get clock\n");
+ ret = PTR_ERR(clk);
+ goto err4;
+ }
+
+ ret = clk_enable(phy_clk);
+ if (ret) {
+ dev_err(&pdev->dev, "failed to enable PHY clock\n");
+ goto err5;
+ }
+
+ ret = clk_enable(clk);
+ if (ret) {
+ dev_err(&pdev->dev, "failed to enable clock\n");
+ goto err6;
+ }
+
+ glue->dev = &pdev->dev;
+ glue->phy_clk = phy_clk;
+ glue->clk = clk;
+
+ pdata->platform_ops = &am35x_ops;
+
+ glue->phy = usb_phy_generic_register();
+ if (IS_ERR(glue->phy)) {
+ ret = PTR_ERR(glue->phy);
+ goto err7;
+ }
+ platform_set_drvdata(pdev, glue);
+
+ pinfo = am35x_dev_info;
+ pinfo.parent = &pdev->dev;
+ pinfo.res = pdev->resource;
+ pinfo.num_res = pdev->num_resources;
+ pinfo.data = pdata;
+ pinfo.size_data = sizeof(*pdata);
+ pinfo.fwnode = of_fwnode_handle(pdev->dev.of_node);
+ pinfo.of_node_reused = true;
+
+ glue->musb = musb = platform_device_register_full(&pinfo);
+ if (IS_ERR(musb)) {
+ ret = PTR_ERR(musb);
+ dev_err(&pdev->dev, "failed to register musb device: %d\n", ret);
+ goto err8;
+ }
+
+ return 0;
+
+err8:
+ usb_phy_generic_unregister(glue->phy);
+
+err7:
+ clk_disable(clk);
+
+err6:
+ clk_disable(phy_clk);
+
+err5:
+ clk_put(clk);
+
+err4:
+ clk_put(phy_clk);
+
+err3:
+ kfree(glue);
+
+err0:
+ return ret;
+}
+
+static int am35x_remove(struct platform_device *pdev)
+{
+ struct am35x_glue *glue = platform_get_drvdata(pdev);
+
+ platform_device_unregister(glue->musb);
+ usb_phy_generic_unregister(glue->phy);
+ clk_disable(glue->clk);
+ clk_disable(glue->phy_clk);
+ clk_put(glue->clk);
+ clk_put(glue->phy_clk);
+ kfree(glue);
+
+ return 0;
+}
+
+#ifdef CONFIG_PM_SLEEP
+static int am35x_suspend(struct device *dev)
+{
+ struct am35x_glue *glue = dev_get_drvdata(dev);
+ struct musb_hdrc_platform_data *plat = dev_get_platdata(dev);
+ struct omap_musb_board_data *data = plat->board_data;
+
+ /* Shutdown the on-chip PHY and its PLL. */
+ if (data->set_phy_power)
+ data->set_phy_power(0);
+
+ clk_disable(glue->phy_clk);
+ clk_disable(glue->clk);
+
+ return 0;
+}
+
+static int am35x_resume(struct device *dev)
+{
+ struct am35x_glue *glue = dev_get_drvdata(dev);
+ struct musb_hdrc_platform_data *plat = dev_get_platdata(dev);
+ struct omap_musb_board_data *data = plat->board_data;
+ int ret;
+
+ /* Start the on-chip PHY and its PLL. */
+ if (data->set_phy_power)
+ data->set_phy_power(1);
+
+ ret = clk_enable(glue->phy_clk);
+ if (ret) {
+ dev_err(dev, "failed to enable PHY clock\n");
+ return ret;
+ }
+
+ ret = clk_enable(glue->clk);
+ if (ret) {
+ dev_err(dev, "failed to enable clock\n");
+ return ret;
+ }
+
+ return 0;
+}
+#endif
+
+static SIMPLE_DEV_PM_OPS(am35x_pm_ops, am35x_suspend, am35x_resume);
+
+static struct platform_driver am35x_driver = {
+ .probe = am35x_probe,
+ .remove = am35x_remove,
+ .driver = {
+ .name = "musb-am35x",
+ .pm = &am35x_pm_ops,
+ },
+};
+
+MODULE_DESCRIPTION("AM35x MUSB Glue Layer");
+MODULE_AUTHOR("Ajay Kumar Gupta <ajay.gupta@ti.com>");
+MODULE_LICENSE("GPL v2");
+module_platform_driver(am35x_driver);
generated by cgit v1.2.3 (git 2.39.1) at 2024-12-26 21:22:05 +0000