diff options
Diffstat (limited to 'drivers/usb/host/ehci-tegra.c')
| -rw-r--r-- | drivers/usb/host/ehci-tegra.c | 715 |
1 files changed, 715 insertions, 0 deletions
diff --git a/drivers/usb/host/ehci-tegra.c b/drivers/usb/host/ehci-tegra.c new file mode 100644 index 00000000000..a516af28c29 --- /dev/null +++ b/drivers/usb/host/ehci-tegra.c @@ -0,0 +1,715 @@ +/* + * EHCI-compliant USB host controller driver for NVIDIA Tegra SoCs + * + * Copyright (C) 2010 Google, Inc. + * Copyright (C) 2009 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/platform_device.h> +#include <linux/platform_data/tegra_usb.h> +#include <linux/irq.h> +#include <linux/usb/otg.h> +#include <mach/usb_phy.h> + +#define TEGRA_USB_DMA_ALIGN 32 + +struct tegra_ehci_hcd { + struct ehci_hcd *ehci; + struct tegra_usb_phy *phy; + struct clk *clk; + struct clk *emc_clk; + struct otg_transceiver *transceiver; + int host_resumed; + int bus_suspended; + int port_resuming; + int power_down_on_bus_suspend; + enum tegra_usb_phy_port_speed port_speed; +}; + +static void tegra_ehci_power_up(struct usb_hcd *hcd) +{ + struct tegra_ehci_hcd *tegra = dev_get_drvdata(hcd->self.controller); + + clk_enable(tegra->emc_clk); + clk_enable(tegra->clk); + tegra_usb_phy_power_on(tegra->phy); + tegra->host_resumed = 1; +} + +static void tegra_ehci_power_down(struct usb_hcd *hcd) +{ + struct tegra_ehci_hcd *tegra = dev_get_drvdata(hcd->self.controller); + + tegra->host_resumed = 0; + tegra_usb_phy_power_off(tegra->phy); + clk_disable(tegra->clk); + clk_disable(tegra->emc_clk); +} + +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 = dev_get_drvdata(hcd->self.controller); + 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); + + /* + * In ehci_hub_control() for USB_PORT_FEAT_ENABLE clears the other bits + * that are write on clear, by writing back the register read value, so + * USB_PORT_FEAT_ENABLE is handled by masking the set on clear bits + */ + if (typeReq == ClearPortFeature && wValue == USB_PORT_FEAT_ENABLE) { + temp = ehci_readl(ehci, status_reg) & ~PORT_RWC_BITS; + ehci_writel(ehci, temp & ~PORT_PE, status_reg); + goto done; + } + + else 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(tegra->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_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 (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; + } + + /* + * 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(tegra->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); + + spin_unlock_irqrestore(&ehci->lock, flags); + msleep(20); + spin_lock_irqsave(&ehci->lock, flags); + + /* Poll until the controller clears RESUME and SUSPEND */ + if (handshake(ehci, status_reg, PORT_RESUME, 0, 2000)) + pr_err("%s: timeout waiting for RESUME\n", __func__); + if (handshake(ehci, status_reg, PORT_SUSPEND, 0, 2000)) + pr_err("%s: timeout waiting for SUSPEND\n", __func__); + + ehci->reset_done[wIndex-1] = 0; + + 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; +} + +static void tegra_ehci_restart(struct usb_hcd *hcd) +{ + struct ehci_hcd *ehci = hcd_to_ehci(hcd); + + ehci_reset(ehci); + + /* setup the frame list and Async q heads */ + ehci_writel(ehci, ehci->periodic_dma, &ehci->regs->frame_list); + ehci_writel(ehci, (u32)ehci->async->qh_dma, &ehci->regs->async_next); + /* setup the command register and set the controller in RUN mode */ + ehci->command &= ~(CMD_LRESET|CMD_IAAD|CMD_PSE|CMD_ASE|CMD_RESET); + ehci->command |= CMD_RUN; + ehci_writel(ehci, ehci->command, &ehci->regs->command); + + down_write(&ehci_cf_port_reset_rwsem); + ehci_writel(ehci, FLAG_CF, &ehci->regs->configured_flag); + /* flush posted writes */ + ehci_readl(ehci, &ehci->regs->command); + up_write(&ehci_cf_port_reset_rwsem); +} + +static int tegra_usb_suspend(struct usb_hcd *hcd) +{ + struct tegra_ehci_hcd *tegra = dev_get_drvdata(hcd->self.controller); + struct ehci_regs __iomem *hw = tegra->ehci->regs; + unsigned long flags; + + spin_lock_irqsave(&tegra->ehci->lock, flags); + + tegra->port_speed = (readl(&hw->port_status[0]) >> 26) & 0x3; + ehci_halt(tegra->ehci); + clear_bit(HCD_FLAG_HW_ACCESSIBLE, &hcd->flags); + + spin_unlock_irqrestore(&tegra->ehci->lock, flags); + + tegra_ehci_power_down(hcd); + return 0; +} + +static int tegra_usb_resume(struct usb_hcd *hcd) +{ + struct tegra_ehci_hcd *tegra = dev_get_drvdata(hcd->self.controller); + struct ehci_hcd *ehci = hcd_to_ehci(hcd); + struct ehci_regs __iomem *hw = ehci->regs; + unsigned long val; + + set_bit(HCD_FLAG_HW_ACCESSIBLE, &hcd->flags); + tegra_ehci_power_up(hcd); + + if (tegra->port_speed > TEGRA_USB_PHY_PORT_SPEED_HIGH) { + /* Wait for the phy to detect new devices + * before we restart the controller */ + msleep(10); + goto restart; + } + + /* Force the phy to keep data lines in suspend state */ + tegra_ehci_phy_restore_start(tegra->phy, tegra->port_speed); + + /* Enable host mode */ + tdi_reset(ehci); + + /* Enable Port Power */ + val = readl(&hw->port_status[0]); + val |= PORT_POWER; + writel(val, &hw->port_status[0]); + udelay(10); + + /* Check if the phy resume from LP0. When the phy resume from LP0 + * USB register will be reset. */ + if (!readl(&hw->async_next)) { + /* Program the field PTC based on the saved speed mode */ + val = readl(&hw->port_status[0]); + val &= ~PORT_TEST(~0); + if (tegra->port_speed == TEGRA_USB_PHY_PORT_SPEED_HIGH) + val |= PORT_TEST_FORCE; + else if (tegra->port_speed == TEGRA_USB_PHY_PORT_SPEED_FULL) + val |= PORT_TEST(6); + else if (tegra->port_speed == TEGRA_USB_PHY_PORT_SPEED_LOW) + val |= PORT_TEST(7); + writel(val, &hw->port_status[0]); + udelay(10); + + /* Disable test mode by setting PTC field to NORMAL_OP */ + val = readl(&hw->port_status[0]); + val &= ~PORT_TEST(~0); + writel(val, &hw->port_status[0]); + udelay(10); + } + + /* Poll until CCS is enabled */ + if (handshake(ehci, &hw->port_status[0], PORT_CONNECT, + PORT_CONNECT, 2000)) { + pr_err("%s: timeout waiting for PORT_CONNECT\n", __func__); + goto restart; + } + + /* Poll until PE is enabled */ + if (handshake(ehci, &hw->port_status[0], PORT_PE, + PORT_PE, 2000)) { + pr_err("%s: timeout waiting for USB_PORTSC1_PE\n", __func__); + goto restart; + } + + /* Clear the PCI status, to avoid an interrupt taken upon resume */ + val = readl(&hw->status); + val |= STS_PCD; + writel(val, &hw->status); + + /* Put controller in suspend mode by writing 1 to SUSP bit of PORTSC */ + val = readl(&hw->port_status[0]); + if ((val & PORT_POWER) && (val & PORT_PE)) { + val |= PORT_SUSPEND; + writel(val, &hw->port_status[0]); + + /* Wait until port suspend completes */ + if (handshake(ehci, &hw->port_status[0], PORT_SUSPEND, + PORT_SUSPEND, 1000)) { + pr_err("%s: timeout waiting for PORT_SUSPEND\n", + __func__); + goto restart; + } + } + + tegra_ehci_phy_restore_end(tegra->phy); + return 0; + +restart: + if (tegra->port_speed <= TEGRA_USB_PHY_PORT_SPEED_HIGH) + tegra_ehci_phy_restore_end(tegra->phy); + + tegra_ehci_restart(hcd); + return 0; +} + +static void tegra_ehci_shutdown(struct usb_hcd *hcd) +{ + struct tegra_ehci_hcd *tegra = dev_get_drvdata(hcd->self.controller); + + /* ehci_shutdown touches the USB controller registers, make sure + * controller has clocks to it */ + if (!tegra->host_resumed) + tegra_ehci_power_up(hcd); + + ehci_shutdown(hcd); +} + +static int tegra_ehci_setup(struct usb_hcd *hcd) +{ + struct ehci_hcd *ehci = hcd_to_ehci(hcd); + int retval; + + /* EHCI registers start at offset 0x100 */ + ehci->caps = hcd->regs + 0x100; + ehci->regs = hcd->regs + 0x100 + + HC_LENGTH(readl(&ehci->caps->hc_capbase)); + + dbg_hcs_params(ehci, "reset"); + dbg_hcc_params(ehci, "reset"); + + /* cache this readonly data; minimize chip reads */ + ehci->hcs_params = readl(&ehci->caps->hcs_params); + + /* switch to host mode */ + hcd->has_tt = 1; + ehci_reset(ehci); + + retval = ehci_halt(ehci); + if (retval) + return retval; + + /* data structure init */ + retval = ehci_init(hcd); + if (retval) + return retval; + + ehci->sbrn = 0x20; + + ehci_port_power(ehci, 1); + return retval; +} + +#ifdef CONFIG_PM +static int tegra_ehci_bus_suspend(struct usb_hcd *hcd) +{ + struct tegra_ehci_hcd *tegra = dev_get_drvdata(hcd->self.controller); + int error_status = 0; + + error_status = ehci_bus_suspend(hcd); + if (!error_status && tegra->power_down_on_bus_suspend) { + tegra_usb_suspend(hcd); + tegra->bus_suspended = 1; + } + + return error_status; +} + +static int tegra_ehci_bus_resume(struct usb_hcd *hcd) +{ + struct tegra_ehci_hcd *tegra = dev_get_drvdata(hcd->self.controller); + + if (tegra->bus_suspended && tegra->power_down_on_bus_suspend) { + tegra_usb_resume(hcd); + tegra->bus_suspended = 0; + } + + tegra_usb_phy_preresume(tegra->phy); + tegra->port_resuming = 1; + return ehci_bus_resume(hcd); +} +#endif + +struct temp_buffer { + void *kmalloc_ptr; + void *old_xfer_buffer; + u8 data[0]; +}; + +static void free_temp_buffer(struct urb *urb) +{ + enum dma_data_direction dir; + struct temp_buffer *temp; + + if (!(urb->transfer_flags & URB_ALIGNED_TEMP_BUFFER)) + return; + + dir = usb_urb_dir_in(urb) ? DMA_FROM_DEVICE : DMA_TO_DEVICE; + + temp = container_of(urb->transfer_buffer, struct temp_buffer, + data); + + if (dir == DMA_FROM_DEVICE) + 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_temp_buffer(struct urb *urb, gfp_t mem_flags) +{ + enum dma_data_direction dir; + struct temp_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; + + dir = usb_urb_dir_in(urb) ? DMA_FROM_DEVICE : DMA_TO_DEVICE; + + /* Allocate a buffer with enough padding for alignment */ + kmalloc_size = urb->transfer_buffer_length + + sizeof(struct temp_buffer) + TEGRA_USB_DMA_ALIGN - 1; + + kmalloc_ptr = kmalloc(kmalloc_size, mem_flags); + if (!kmalloc_ptr) + return -ENOMEM; + + /* Position our struct temp_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 (dir == DMA_TO_DEVICE) + 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_temp_buffer(urb, mem_flags); + if (ret) + return ret; + + ret = usb_hcd_map_urb_for_dma(hcd, urb, mem_flags); + if (ret) + free_temp_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_temp_buffer(urb); +} + +static const struct hc_driver tegra_ehci_hc_driver = { + .description = hcd_name, + .product_desc = "Tegra EHCI Host Controller", + .hcd_priv_size = sizeof(struct ehci_hcd), + + .flags = HCD_USB2 | HCD_MEMORY, + + .reset = tegra_ehci_setup, + .irq = ehci_irq, + + .start = ehci_run, + .stop = ehci_stop, + .shutdown = tegra_ehci_shutdown, + .urb_enqueue = ehci_urb_enqueue, + .urb_dequeue = ehci_urb_dequeue, + .map_urb_for_dma = tegra_ehci_map_urb_for_dma, + .unmap_urb_for_dma = tegra_ehci_unmap_urb_for_dma, + .endpoint_disable = ehci_endpoint_disable, + .endpoint_reset = ehci_endpoint_reset, + .get_frame_number = ehci_get_frame, + .hub_status_data = ehci_hub_status_data, + .hub_control = tegra_ehci_hub_control, + .clear_tt_buffer_complete = ehci_clear_tt_buffer_complete, +#ifdef CONFIG_PM + .bus_suspend = tegra_ehci_bus_suspend, + .bus_resume = tegra_ehci_bus_resume, +#endif + .relinquish_port = ehci_relinquish_port, + .port_handed_over = ehci_port_handed_over, +}; + +static int tegra_ehci_probe(struct platform_device *pdev) +{ + struct resource *res; + struct usb_hcd *hcd; + struct tegra_ehci_hcd *tegra; + struct tegra_ehci_platform_data *pdata; + int err = 0; + int irq; + int instance = pdev->id; + + pdata = pdev->dev.platform_data; + if (!pdata) { + dev_err(&pdev->dev, "Platform data missing\n"); + return -EINVAL; + } + + tegra = kzalloc(sizeof(struct tegra_ehci_hcd), GFP_KERNEL); + if (!tegra) + return -ENOMEM; + + 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 fail_hcd; + } + + platform_set_drvdata(pdev, tegra); + + tegra->clk = 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 fail_clk; + } + + err = clk_enable(tegra->clk); + if (err) + goto fail_clken; + + tegra->emc_clk = clk_get(&pdev->dev, "emc"); + if (IS_ERR(tegra->emc_clk)) { + dev_err(&pdev->dev, "Can't get emc clock\n"); + err = PTR_ERR(tegra->emc_clk); + goto fail_emc_clk; + } + + clk_enable(tegra->emc_clk); + clk_set_rate(tegra->emc_clk, 400000000); + + res = platform_get_resource(pdev, IORESOURCE_MEM, 0); + if (!res) { + dev_err(&pdev->dev, "Failed to get I/O memory\n"); + err = -ENXIO; + goto fail_io; + } + hcd->rsrc_start = res->start; + hcd->rsrc_len = resource_size(res); + hcd->regs = ioremap(res->start, resource_size(res)); + if (!hcd->regs) { + dev_err(&pdev->dev, "Failed to remap I/O memory\n"); + err = -ENOMEM; + goto fail_io; + } + + tegra->phy = tegra_usb_phy_open(instance, hcd->regs, pdata->phy_config, + TEGRA_USB_PHY_MODE_HOST); + if (IS_ERR(tegra->phy)) { + dev_err(&pdev->dev, "Failed to open USB phy\n"); + err = -ENXIO; + goto fail_phy; + } + + err = tegra_usb_phy_power_on(tegra->phy); + if (err) { + dev_err(&pdev->dev, "Failed to power on the phy\n"); + goto fail; + } + + tegra->host_resumed = 1; + tegra->power_down_on_bus_suspend = pdata->power_down_on_bus_suspend; + tegra->ehci = hcd_to_ehci(hcd); + + irq = platform_get_irq(pdev, 0); + if (!irq) { + dev_err(&pdev->dev, "Failed to get IRQ\n"); + err = -ENODEV; + goto fail; + } + set_irq_flags(irq, IRQF_VALID); + +#ifdef CONFIG_USB_OTG_UTILS + if (pdata->operating_mode == TEGRA_USB_OTG) { + tegra->transceiver = otg_get_transceiver(); + if (tegra->transceiver) + otg_set_host(tegra->transceiver, &hcd->self); + } +#endif + + err = usb_add_hcd(hcd, irq, IRQF_DISABLED | IRQF_SHARED); + if (err) { + dev_err(&pdev->dev, "Failed to add USB HCD\n"); + goto fail; + } + + return err; + +fail: +#ifdef CONFIG_USB_OTG_UTILS + if (tegra->transceiver) { + otg_set_host(tegra->transceiver, NULL); + otg_put_transceiver(tegra->transceiver); + } +#endif + tegra_usb_phy_close(tegra->phy); +fail_phy: + iounmap(hcd->regs); +fail_io: + clk_disable(tegra->emc_clk); + clk_put(tegra->emc_clk); +fail_emc_clk: + clk_disable(tegra->clk); +fail_clken: + clk_put(tegra->clk); +fail_clk: + usb_put_hcd(hcd); +fail_hcd: + kfree(tegra); + return err; +} + +#ifdef CONFIG_PM +static int tegra_ehci_resume(struct platform_device *pdev) +{ + struct tegra_ehci_hcd *tegra = platform_get_drvdata(pdev); + struct usb_hcd *hcd = ehci_to_hcd(tegra->ehci); + + if (tegra->bus_suspended) + return 0; + + return tegra_usb_resume(hcd); +} + +static int tegra_ehci_suspend(struct platform_device *pdev, pm_message_t state) +{ + struct tegra_ehci_hcd *tegra = platform_get_drvdata(pdev); + struct usb_hcd *hcd = ehci_to_hcd(tegra->ehci); + + if (tegra->bus_suspended) + return 0; + + if (time_before(jiffies, tegra->ehci->next_statechange)) + msleep(10); + + return tegra_usb_suspend(hcd); +} +#endif + +static int tegra_ehci_remove(struct platform_device *pdev) +{ + struct tegra_ehci_hcd *tegra = platform_get_drvdata(pdev); + struct usb_hcd *hcd = ehci_to_hcd(tegra->ehci); + + if (tegra == NULL || hcd == NULL) + return -EINVAL; + +#ifdef CONFIG_USB_OTG_UTILS + if (tegra->transceiver) { + otg_set_host(tegra->transceiver, NULL); + otg_put_transceiver(tegra->transceiver); + } +#endif + + usb_remove_hcd(hcd); + usb_put_hcd(hcd); + + tegra_usb_phy_close(tegra->phy); + iounmap(hcd->regs); + + clk_disable(tegra->clk); + clk_put(tegra->clk); + + clk_disable(tegra->emc_clk); + clk_put(tegra->emc_clk); + + kfree(tegra); + return 0; +} + +static void tegra_ehci_hcd_shutdown(struct platform_device *pdev) +{ + struct tegra_ehci_hcd *tegra = platform_get_drvdata(pdev); + struct usb_hcd *hcd = ehci_to_hcd(tegra->ehci); + + if (hcd->driver->shutdown) + hcd->driver->shutdown(hcd); +} + +static struct platform_driver tegra_ehci_driver = { + .probe = tegra_ehci_probe, + .remove = tegra_ehci_remove, +#ifdef CONFIG_PM + .suspend = tegra_ehci_suspend, + .resume = tegra_ehci_resume, +#endif + .shutdown = tegra_ehci_hcd_shutdown, + .driver = { + .name = "tegra-ehci", + } +}; |