diff options
Diffstat (limited to 'drivers/usb/host/ehci-tegra.c')
| -rw-r--r-- | drivers/usb/host/ehci-tegra.c | 584 |
1 files changed, 0 insertions, 584 deletions
diff --git a/drivers/usb/host/ehci-tegra.c b/drivers/usb/host/ehci-tegra.c deleted file mode 100644 index 6ee7ef79b4f8..000000000000 --- a/drivers/usb/host/ehci-tegra.c +++ /dev/null @@ -1,584 +0,0 @@ -/* - * EHCI-compliant USB host controller driver for NVIDIA Tegra SoCs - * - * Copyright (C) 2010 Google, Inc. - * Copyright (C) 2009 - 2013 NVIDIA Corporation - * - * This program is free software; you can redistribute it and/or modify it - * under the terms of the GNU General Public License as published by the - * Free Software Foundation; either version 2 of the License, or (at your - * option) any later version. - * - * This program is distributed in the hope that it will be useful, but WITHOUT - * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or - * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for - * more details. - * - */ - -#include <linux/clk.h> -#include <linux/clk/tegra.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_gpio.h> -#include <linux/platform_device.h> -#include <linux/platform_data/tegra_usb.h> -#include <linux/pm_runtime.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 TEGRA_USB_BASE 0xC5000000 -#define TEGRA_USB2_BASE 0xC5004000 -#define TEGRA_USB3_BASE 0xC5008000 - -#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; - -static int (*orig_hub_control)(struct usb_hcd *hcd, - u16 typeReq, u16 wValue, u16 wIndex, - char *buf, u16 wLength); - -struct tegra_ehci_hcd { - struct tegra_usb_phy *phy; - struct clk *clk; - struct usb_phy *transceiver; - int port_resuming; - bool needs_double_reset; - enum tegra_usb_phy_port_speed port_speed; -}; - -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->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->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 orig_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[0]; -}; - -static void free_dma_aligned_buffer(struct urb *urb) -{ - struct dma_aligned_buffer *temp; - - 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)) - memcpy(temp->old_xfer_buffer, temp->data, - urb->transfer_buffer_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 int setup_vbus_gpio(struct platform_device *pdev, - struct tegra_ehci_platform_data *pdata) -{ - int err = 0; - int gpio; - - gpio = pdata->vbus_gpio; - if (!gpio_is_valid(gpio)) - gpio = of_get_named_gpio(pdev->dev.of_node, - "nvidia,vbus-gpio", 0); - if (!gpio_is_valid(gpio)) - return 0; - - err = gpio_request(gpio, "vbus_gpio"); - if (err) { - dev_err(&pdev->dev, "can't request vbus gpio %d", gpio); - return err; - } - err = gpio_direction_output(gpio, 1); - if (err) { - dev_err(&pdev->dev, "can't enable vbus\n"); - return err; - } - - return err; -} - -static int tegra_ehci_probe(struct platform_device *pdev) -{ - struct resource *res; - struct usb_hcd *hcd; - struct ehci_hcd *ehci; - struct tegra_ehci_hcd *tegra; - struct tegra_ehci_platform_data *pdata; - int err = 0; - int irq; - struct device_node *np_phy; - struct usb_phy *u_phy; - - pdata = pdev->dev.platform_data; - if (!pdata) { - dev_err(&pdev->dev, "Platform data missing\n"); - return -EINVAL; - } - - /* 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. - */ - if (!pdev->dev.dma_mask) - pdev->dev.dma_mask = &pdev->dev.coherent_dma_mask; - if (!pdev->dev.coherent_dma_mask) - pdev->dev.coherent_dma_mask = DMA_BIT_MASK(32); - - setup_vbus_gpio(pdev, pdata); - - 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"); - err = -ENOMEM; - goto cleanup_vbus_gpio; - } - 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; - } - - err = clk_prepare_enable(tegra->clk); - if (err) - goto cleanup_clk_get; - - tegra_periph_reset_assert(tegra->clk); - udelay(1); - tegra_periph_reset_deassert(tegra->clk); - - np_phy = of_parse_phandle(pdev->dev.of_node, "nvidia,phy", 0); - if (!np_phy) { - err = -ENODEV; - goto cleanup_clk_en; - } - - u_phy = tegra_usb_get_phy(np_phy); - if (IS_ERR(u_phy)) { - err = PTR_ERR(u_phy); - goto cleanup_clk_en; - } - hcd->phy = u_phy; - - tegra->needs_double_reset = of_property_read_bool(pdev->dev.of_node, - "nvidia,needs-double-reset"); - - res = platform_get_resource(pdev, IORESOURCE_MEM, 0); - if (!res) { - dev_err(&pdev->dev, "Failed to get I/O memory\n"); - err = -ENXIO; - goto cleanup_clk_en; - } - hcd->rsrc_start = res->start; - hcd->rsrc_len = resource_size(res); - hcd->regs = devm_ioremap(&pdev->dev, res->start, resource_size(res)); - if (!hcd->regs) { - dev_err(&pdev->dev, "Failed to remap I/O memory\n"); - err = -ENOMEM; - goto cleanup_clk_en; - } - ehci->caps = hcd->regs + 0x100; - - err = usb_phy_init(hcd->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) { - dev_err(&pdev->dev, "Failed to alloc memory for otg\n"); - err = -ENOMEM; - goto cleanup_phy; - } - u_phy->otg->host = hcd_to_bus(hcd); - - err = usb_phy_set_suspend(hcd->phy, 0); - if (err) { - dev_err(&pdev->dev, "Failed to power on the phy\n"); - goto cleanup_phy; - } - - irq = platform_get_irq(pdev, 0); - if (!irq) { - dev_err(&pdev->dev, "Failed to get IRQ\n"); - err = -ENODEV; - goto cleanup_phy; - } - - if (pdata->operating_mode == TEGRA_USB_OTG) { - tegra->transceiver = - devm_usb_get_phy(&pdev->dev, USB_PHY_TYPE_USB2); - if (!IS_ERR(tegra->transceiver)) - otg_set_host(tegra->transceiver->otg, &hcd->self); - } else { - tegra->transceiver = ERR_PTR(-ENODEV); - } - - err = usb_add_hcd(hcd, irq, IRQF_SHARED); - if (err) { - dev_err(&pdev->dev, "Failed to add USB HCD\n"); - goto cleanup_transceiver; - } - - return err; - -cleanup_transceiver: - if (!IS_ERR(tegra->transceiver)) - otg_set_host(tegra->transceiver->otg, NULL); -cleanup_phy: - usb_phy_shutdown(hcd->phy); -cleanup_clk_en: - clk_disable_unprepare(tegra->clk); -cleanup_clk_get: - clk_put(tegra->clk); -cleanup_hcd_create: - usb_put_hcd(hcd); -cleanup_vbus_gpio: - /* FIXME: Undo setup_vbus_gpio() here */ - 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; - - if (!IS_ERR(tegra->transceiver)) - otg_set_host(tegra->transceiver->otg, NULL); - - usb_phy_shutdown(hcd->phy); - usb_remove_hcd(hcd); - usb_put_hcd(hcd); - - clk_disable_unprepare(tegra->clk); - - 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 of_device_id tegra_ehci_of_match[] = { - { .compatible = "nvidia,tegra20-ehci", }, - { }, -}; - -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 const struct ehci_driver_overrides tegra_overrides __initconst = { - .extra_priv_size = sizeof(struct tegra_ehci_hcd), -}; - -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. - */ - - orig_hub_control = tegra_ehci_hc_driver.hub_control; - - 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); |