+++ /dev/null
-// SPDX-License-Identifier: GPL-2.0+
-/*
- * EHCI-compliant USB host controller driver for NVIDIA Tegra SoCs
- *
- * Copyright (C) 2010 Google, Inc.
- * Copyright (C) 2009 - 2013 NVIDIA Corporation
- */
-
-#include <linux/clk.h>
-#include <linux/dma-mapping.h>
-#include <linux/err.h>
-#include <linux/gpio.h>
-#include <linux/io.h>
-#include <linux/irq.h>
-#include <linux/module.h>
-#include <linux/of.h>
-#include <linux/of_device.h>
-#include <linux/of_gpio.h>
-#include <linux/platform_device.h>
-#include <linux/pm_runtime.h>
-#include <linux/reset.h>
-#include <linux/slab.h>
-#include <linux/usb/ehci_def.h>
-#include <linux/usb/tegra_usb_phy.h>
-#include <linux/usb.h>
-#include <linux/usb/hcd.h>
-#include <linux/usb/otg.h>
-
-#include "ehci.h"
-
-#define PORT_WAKE_BITS (PORT_WKOC_E|PORT_WKDISC_E|PORT_WKCONN_E)
-
-#define TEGRA_USB_DMA_ALIGN 32
-
-#define DRIVER_DESC "Tegra EHCI driver"
-#define DRV_NAME "tegra-ehci"
-
-static struct hc_driver __read_mostly tegra_ehci_hc_driver;
-
-struct tegra_ehci_soc_config {
- bool has_hostpc;
-};
-
-struct tegra_ehci_hcd {
- struct clk *clk;
- struct reset_control *rst;
- int port_resuming;
- bool needs_double_reset;
-};
-
-static int tegra_reset_usb_controller(struct platform_device *pdev)
-{
- struct device_node *phy_np;
- struct usb_hcd *hcd = platform_get_drvdata(pdev);
- struct tegra_ehci_hcd *tegra =
- (struct tegra_ehci_hcd *)hcd_to_ehci(hcd)->priv;
- struct reset_control *rst;
- int err;
-
- phy_np = of_parse_phandle(pdev->dev.of_node, "nvidia,phy", 0);
- if (!phy_np)
- return -ENOENT;
-
- /*
- * The 1st USB controller contains some UTMI pad registers that are
- * global for all the controllers on the chip. Those registers are
- * also cleared when reset is asserted to the 1st controller.
- */
- rst = of_reset_control_get_shared(phy_np, "utmi-pads");
- if (IS_ERR(rst)) {
- dev_warn(&pdev->dev,
- "can't get utmi-pads reset from the PHY\n");
- dev_warn(&pdev->dev,
- "continuing, but please update your DT\n");
- } else {
- /*
- * PHY driver performs UTMI-pads reset in a case of
- * non-legacy DT.
- */
- reset_control_put(rst);
- }
-
- of_node_put(phy_np);
-
- /* reset control is shared, hence initialize it first */
- err = reset_control_deassert(tegra->rst);
- if (err)
- return err;
-
- err = reset_control_assert(tegra->rst);
- if (err)
- return err;
-
- udelay(1);
-
- err = reset_control_deassert(tegra->rst);
- if (err)
- return err;
-
- return 0;
-}
-
-static int tegra_ehci_internal_port_reset(
- struct ehci_hcd *ehci,
- u32 __iomem *portsc_reg
-)
-{
- u32 temp;
- unsigned long flags;
- int retval = 0;
- int i, tries;
- u32 saved_usbintr;
-
- spin_lock_irqsave(&ehci->lock, flags);
- saved_usbintr = ehci_readl(ehci, &ehci->regs->intr_enable);
- /* disable USB interrupt */
- ehci_writel(ehci, 0, &ehci->regs->intr_enable);
- spin_unlock_irqrestore(&ehci->lock, flags);
-
- /*
- * Here we have to do Port Reset at most twice for
- * Port Enable bit to be set.
- */
- for (i = 0; i < 2; i++) {
- temp = ehci_readl(ehci, portsc_reg);
- temp |= PORT_RESET;
- ehci_writel(ehci, temp, portsc_reg);
- mdelay(10);
- temp &= ~PORT_RESET;
- ehci_writel(ehci, temp, portsc_reg);
- mdelay(1);
- tries = 100;
- do {
- mdelay(1);
- /*
- * Up to this point, Port Enable bit is
- * expected to be set after 2 ms waiting.
- * USB1 usually takes extra 45 ms, for safety,
- * we take 100 ms as timeout.
- */
- temp = ehci_readl(ehci, portsc_reg);
- } while (!(temp & PORT_PE) && tries--);
- if (temp & PORT_PE)
- break;
- }
- if (i == 2)
- retval = -ETIMEDOUT;
-
- /*
- * Clear Connect Status Change bit if it's set.
- * We can't clear PORT_PEC. It will also cause PORT_PE to be cleared.
- */
- if (temp & PORT_CSC)
- ehci_writel(ehci, PORT_CSC, portsc_reg);
-
- /*
- * Write to clear any interrupt status bits that might be set
- * during port reset.
- */
- temp = ehci_readl(ehci, &ehci->regs->status);
- ehci_writel(ehci, temp, &ehci->regs->status);
-
- /* restore original interrupt enable bits */
- ehci_writel(ehci, saved_usbintr, &ehci->regs->intr_enable);
- return retval;
-}
-
-static int tegra_ehci_hub_control(
- struct usb_hcd *hcd,
- u16 typeReq,
- u16 wValue,
- u16 wIndex,
- char *buf,
- u16 wLength
-)
-{
- struct ehci_hcd *ehci = hcd_to_ehci(hcd);
- struct tegra_ehci_hcd *tegra = (struct tegra_ehci_hcd *)ehci->priv;
- u32 __iomem *status_reg;
- u32 temp;
- unsigned long flags;
- int retval = 0;
-
- status_reg = &ehci->regs->port_status[(wIndex & 0xff) - 1];
-
- spin_lock_irqsave(&ehci->lock, flags);
-
- if (typeReq == GetPortStatus) {
- temp = ehci_readl(ehci, status_reg);
- if (tegra->port_resuming && !(temp & PORT_SUSPEND)) {
- /* Resume completed, re-enable disconnect detection */
- tegra->port_resuming = 0;
- tegra_usb_phy_postresume(hcd->usb_phy);
- }
- }
-
- else if (typeReq == SetPortFeature && wValue == USB_PORT_FEAT_SUSPEND) {
- temp = ehci_readl(ehci, status_reg);
- if ((temp & PORT_PE) == 0 || (temp & PORT_RESET) != 0) {
- retval = -EPIPE;
- goto done;
- }
-
- temp &= ~(PORT_RWC_BITS | PORT_WKCONN_E);
- temp |= PORT_WKDISC_E | PORT_WKOC_E;
- ehci_writel(ehci, temp | PORT_SUSPEND, status_reg);
-
- /*
- * If a transaction is in progress, there may be a delay in
- * suspending the port. Poll until the port is suspended.
- */
- if (ehci_handshake(ehci, status_reg, PORT_SUSPEND,
- PORT_SUSPEND, 5000))
- pr_err("%s: timeout waiting for SUSPEND\n", __func__);
-
- set_bit((wIndex & 0xff) - 1, &ehci->suspended_ports);
- goto done;
- }
-
- /* For USB1 port we need to issue Port Reset twice internally */
- if (tegra->needs_double_reset &&
- (typeReq == SetPortFeature && wValue == USB_PORT_FEAT_RESET)) {
- spin_unlock_irqrestore(&ehci->lock, flags);
- return tegra_ehci_internal_port_reset(ehci, status_reg);
- }
-
- /*
- * Tegra host controller will time the resume operation to clear the bit
- * when the port control state switches to HS or FS Idle. This behavior
- * is different from EHCI where the host controller driver is required
- * to set this bit to a zero after the resume duration is timed in the
- * driver.
- */
- else if (typeReq == ClearPortFeature &&
- wValue == USB_PORT_FEAT_SUSPEND) {
- temp = ehci_readl(ehci, status_reg);
- if ((temp & PORT_RESET) || !(temp & PORT_PE)) {
- retval = -EPIPE;
- goto done;
- }
-
- if (!(temp & PORT_SUSPEND))
- goto done;
-
- /* Disable disconnect detection during port resume */
- tegra_usb_phy_preresume(hcd->usb_phy);
-
- ehci->reset_done[wIndex-1] = jiffies + msecs_to_jiffies(25);
-
- temp &= ~(PORT_RWC_BITS | PORT_WAKE_BITS);
- /* start resume signalling */
- ehci_writel(ehci, temp | PORT_RESUME, status_reg);
- set_bit(wIndex-1, &ehci->resuming_ports);
-
- spin_unlock_irqrestore(&ehci->lock, flags);
- msleep(20);
- spin_lock_irqsave(&ehci->lock, flags);
-
- /* Poll until the controller clears RESUME and SUSPEND */
- if (ehci_handshake(ehci, status_reg, PORT_RESUME, 0, 2000))
- pr_err("%s: timeout waiting for RESUME\n", __func__);
- if (ehci_handshake(ehci, status_reg, PORT_SUSPEND, 0, 2000))
- pr_err("%s: timeout waiting for SUSPEND\n", __func__);
-
- ehci->reset_done[wIndex-1] = 0;
- clear_bit(wIndex-1, &ehci->resuming_ports);
-
- tegra->port_resuming = 1;
- goto done;
- }
-
- spin_unlock_irqrestore(&ehci->lock, flags);
-
- /* Handle the hub control events here */
- return ehci_hub_control(hcd, typeReq, wValue, wIndex, buf, wLength);
-
-done:
- spin_unlock_irqrestore(&ehci->lock, flags);
- return retval;
-}
-
-struct dma_aligned_buffer {
- void *kmalloc_ptr;
- void *old_xfer_buffer;
- u8 data[];
-};
-
-static void free_dma_aligned_buffer(struct urb *urb)
-{
- struct dma_aligned_buffer *temp;
- size_t length;
-
- if (!(urb->transfer_flags & URB_ALIGNED_TEMP_BUFFER))
- return;
-
- temp = container_of(urb->transfer_buffer,
- struct dma_aligned_buffer, data);
-
- if (usb_urb_dir_in(urb)) {
- if (usb_pipeisoc(urb->pipe))
- length = urb->transfer_buffer_length;
- else
- length = urb->actual_length;
-
- memcpy(temp->old_xfer_buffer, temp->data, length);
- }
- urb->transfer_buffer = temp->old_xfer_buffer;
- kfree(temp->kmalloc_ptr);
-
- urb->transfer_flags &= ~URB_ALIGNED_TEMP_BUFFER;
-}
-
-static int alloc_dma_aligned_buffer(struct urb *urb, gfp_t mem_flags)
-{
- struct dma_aligned_buffer *temp, *kmalloc_ptr;
- size_t kmalloc_size;
-
- if (urb->num_sgs || urb->sg ||
- urb->transfer_buffer_length == 0 ||
- !((uintptr_t)urb->transfer_buffer & (TEGRA_USB_DMA_ALIGN - 1)))
- return 0;
-
- /* Allocate a buffer with enough padding for alignment */
- kmalloc_size = urb->transfer_buffer_length +
- sizeof(struct dma_aligned_buffer) + TEGRA_USB_DMA_ALIGN - 1;
-
- kmalloc_ptr = kmalloc(kmalloc_size, mem_flags);
- if (!kmalloc_ptr)
- return -ENOMEM;
-
- /* Position our struct dma_aligned_buffer such that data is aligned */
- temp = PTR_ALIGN(kmalloc_ptr + 1, TEGRA_USB_DMA_ALIGN) - 1;
- temp->kmalloc_ptr = kmalloc_ptr;
- temp->old_xfer_buffer = urb->transfer_buffer;
- if (usb_urb_dir_out(urb))
- memcpy(temp->data, urb->transfer_buffer,
- urb->transfer_buffer_length);
- urb->transfer_buffer = temp->data;
-
- urb->transfer_flags |= URB_ALIGNED_TEMP_BUFFER;
-
- return 0;
-}
-
-static int tegra_ehci_map_urb_for_dma(struct usb_hcd *hcd, struct urb *urb,
- gfp_t mem_flags)
-{
- int ret;
-
- ret = alloc_dma_aligned_buffer(urb, mem_flags);
- if (ret)
- return ret;
-
- ret = usb_hcd_map_urb_for_dma(hcd, urb, mem_flags);
- if (ret)
- free_dma_aligned_buffer(urb);
-
- return ret;
-}
-
-static void tegra_ehci_unmap_urb_for_dma(struct usb_hcd *hcd, struct urb *urb)
-{
- usb_hcd_unmap_urb_for_dma(hcd, urb);
- free_dma_aligned_buffer(urb);
-}
-
-static const struct tegra_ehci_soc_config tegra30_soc_config = {
- .has_hostpc = true,
-};
-
-static const struct tegra_ehci_soc_config tegra20_soc_config = {
- .has_hostpc = false,
-};
-
-static const struct of_device_id tegra_ehci_of_match[] = {
- { .compatible = "nvidia,tegra30-ehci", .data = &tegra30_soc_config },
- { .compatible = "nvidia,tegra20-ehci", .data = &tegra20_soc_config },
- { },
-};
-
-static int tegra_ehci_probe(struct platform_device *pdev)
-{
- const struct of_device_id *match;
- const struct tegra_ehci_soc_config *soc_config;
- struct resource *res;
- struct usb_hcd *hcd;
- struct ehci_hcd *ehci;
- struct tegra_ehci_hcd *tegra;
- int err = 0;
- int irq;
- struct usb_phy *u_phy;
-
- match = of_match_device(tegra_ehci_of_match, &pdev->dev);
- if (!match) {
- dev_err(&pdev->dev, "Error: No device match found\n");
- return -ENODEV;
- }
- soc_config = match->data;
-
- /* 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)
- return err;
-
- hcd = usb_create_hcd(&tegra_ehci_hc_driver, &pdev->dev,
- dev_name(&pdev->dev));
- if (!hcd) {
- dev_err(&pdev->dev, "Unable to create HCD\n");
- return -ENOMEM;
- }
- platform_set_drvdata(pdev, hcd);
- ehci = hcd_to_ehci(hcd);
- tegra = (struct tegra_ehci_hcd *)ehci->priv;
-
- hcd->has_tt = 1;
-
- tegra->clk = devm_clk_get(&pdev->dev, NULL);
- if (IS_ERR(tegra->clk)) {
- dev_err(&pdev->dev, "Can't get ehci clock\n");
- err = PTR_ERR(tegra->clk);
- goto cleanup_hcd_create;
- }
-
- tegra->rst = devm_reset_control_get_shared(&pdev->dev, "usb");
- if (IS_ERR(tegra->rst)) {
- dev_err(&pdev->dev, "Can't get ehci reset\n");
- err = PTR_ERR(tegra->rst);
- goto cleanup_hcd_create;
- }
-
- err = clk_prepare_enable(tegra->clk);
- if (err)
- goto cleanup_hcd_create;
-
- err = tegra_reset_usb_controller(pdev);
- if (err) {
- dev_err(&pdev->dev, "Failed to reset controller\n");
- goto cleanup_clk_en;
- }
-
- u_phy = devm_usb_get_phy_by_phandle(&pdev->dev, "nvidia,phy", 0);
- if (IS_ERR(u_phy)) {
- err = -EPROBE_DEFER;
- goto cleanup_clk_en;
- }
- hcd->usb_phy = u_phy;
- hcd->skip_phy_initialization = 1;
-
- tegra->needs_double_reset = of_property_read_bool(pdev->dev.of_node,
- "nvidia,needs-double-reset");
-
- res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
- hcd->regs = devm_ioremap_resource(&pdev->dev, res);
- if (IS_ERR(hcd->regs)) {
- err = PTR_ERR(hcd->regs);
- goto cleanup_clk_en;
- }
- hcd->rsrc_start = res->start;
- hcd->rsrc_len = resource_size(res);
-
- ehci->caps = hcd->regs + 0x100;
- ehci->has_hostpc = soc_config->has_hostpc;
-
- err = usb_phy_init(hcd->usb_phy);
- if (err) {
- dev_err(&pdev->dev, "Failed to initialize phy\n");
- goto cleanup_clk_en;
- }
-
- u_phy->otg = devm_kzalloc(&pdev->dev, sizeof(struct usb_otg),
- GFP_KERNEL);
- if (!u_phy->otg) {
- err = -ENOMEM;
- goto cleanup_phy;
- }
- u_phy->otg->host = hcd_to_bus(hcd);
-
- irq = platform_get_irq(pdev, 0);
- if (irq < 0) {
- err = irq;
- goto cleanup_phy;
- }
-
- otg_set_host(u_phy->otg, &hcd->self);
-
- err = usb_add_hcd(hcd, irq, IRQF_SHARED);
- if (err) {
- dev_err(&pdev->dev, "Failed to add USB HCD\n");
- goto cleanup_otg_set_host;
- }
- device_wakeup_enable(hcd->self.controller);
-
- return err;
-
-cleanup_otg_set_host:
- otg_set_host(u_phy->otg, NULL);
-cleanup_phy:
- usb_phy_shutdown(hcd->usb_phy);
-cleanup_clk_en:
- clk_disable_unprepare(tegra->clk);
-cleanup_hcd_create:
- usb_put_hcd(hcd);
- return err;
-}
-
-static int tegra_ehci_remove(struct platform_device *pdev)
-{
- struct usb_hcd *hcd = platform_get_drvdata(pdev);
- struct tegra_ehci_hcd *tegra =
- (struct tegra_ehci_hcd *)hcd_to_ehci(hcd)->priv;
-
- usb_remove_hcd(hcd);
- otg_set_host(hcd->usb_phy->otg, NULL);
- usb_phy_shutdown(hcd->usb_phy);
- clk_disable_unprepare(tegra->clk);
- usb_put_hcd(hcd);
-
- return 0;
-}
-
-static void tegra_ehci_hcd_shutdown(struct platform_device *pdev)
-{
- struct usb_hcd *hcd = platform_get_drvdata(pdev);
-
- if (hcd->driver->shutdown)
- hcd->driver->shutdown(hcd);
-}
-
-static struct platform_driver tegra_ehci_driver = {
- .probe = tegra_ehci_probe,
- .remove = tegra_ehci_remove,
- .shutdown = tegra_ehci_hcd_shutdown,
- .driver = {
- .name = DRV_NAME,
- .of_match_table = tegra_ehci_of_match,
- }
-};
-
-static int tegra_ehci_reset(struct usb_hcd *hcd)
-{
- struct ehci_hcd *ehci = hcd_to_ehci(hcd);
- int retval;
- int txfifothresh;
-
- retval = ehci_setup(hcd);
- if (retval)
- return retval;
-
- /*
- * We should really pull this value out of tegra_ehci_soc_config, but
- * to avoid needing access to it, make use of the fact that Tegra20 is
- * the only one so far that needs a value of 10, and Tegra20 is the
- * only one which doesn't set has_hostpc.
- */
- txfifothresh = ehci->has_hostpc ? 0x10 : 10;
- ehci_writel(ehci, txfifothresh << 16, &ehci->regs->txfill_tuning);
-
- return 0;
-}
-
-static const struct ehci_driver_overrides tegra_overrides __initconst = {
- .extra_priv_size = sizeof(struct tegra_ehci_hcd),
- .reset = tegra_ehci_reset,
-};
-
-static int __init ehci_tegra_init(void)
-{
- if (usb_disabled())
- return -ENODEV;
-
- pr_info(DRV_NAME ": " DRIVER_DESC "\n");
-
- ehci_init_driver(&tegra_ehci_hc_driver, &tegra_overrides);
-
- /*
- * The Tegra HW has some unusual quirks, which require Tegra-specific
- * workarounds. We override certain hc_driver functions here to
- * achieve that. We explicitly do not enhance ehci_driver_overrides to
- * allow this more easily, since this is an unusual case, and we don't
- * want to encourage others to override these functions by making it
- * too easy.
- */
-
- tegra_ehci_hc_driver.map_urb_for_dma = tegra_ehci_map_urb_for_dma;
- tegra_ehci_hc_driver.unmap_urb_for_dma = tegra_ehci_unmap_urb_for_dma;
- tegra_ehci_hc_driver.hub_control = tegra_ehci_hub_control;
-
- return platform_driver_register(&tegra_ehci_driver);
-}
-module_init(ehci_tegra_init);
-
-static void __exit ehci_tegra_cleanup(void)
-{
- platform_driver_unregister(&tegra_ehci_driver);
-}
-module_exit(ehci_tegra_cleanup);
-
-MODULE_DESCRIPTION(DRIVER_DESC);
-MODULE_LICENSE("GPL");
-MODULE_ALIAS("platform:" DRV_NAME);
-MODULE_DEVICE_TABLE(of, tegra_ehci_of_match);
projects / platform / kernel / linux-starfive.git / commitdiff