+++ /dev/null
-// 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);
projects / users / hch / xfs.git / commitdiff