288 lines
6.8 KiB
C
288 lines
6.8 KiB
C
/*
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* SAMSUNG S5P USB HOST EHCI Controller
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*
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* Copyright (C) 2011 Samsung Electronics Co.Ltd
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* Author: Jingoo Han <jg1.han@samsung.com>
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* Author: Joonyoung Shim <jy0922.shim@samsung.com>
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License as published by the
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* Free Software Foundation; either version 2 of the License, or (at your
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* option) any later version.
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*
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*/
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#include <linux/clk.h>
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#include <linux/of.h>
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#include <linux/platform_device.h>
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#include <linux/of_gpio.h>
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#include <linux/platform_data/usb-ehci-s5p.h>
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#include <plat/usb-phy.h>
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#define EHCI_INSNREG00(base) (base + 0x90)
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#define EHCI_INSNREG00_ENA_INCR16 (0x1 << 25)
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#define EHCI_INSNREG00_ENA_INCR8 (0x1 << 24)
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#define EHCI_INSNREG00_ENA_INCR4 (0x1 << 23)
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#define EHCI_INSNREG00_ENA_INCRX_ALIGN (0x1 << 22)
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#define EHCI_INSNREG00_ENABLE_DMA_BURST \
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(EHCI_INSNREG00_ENA_INCR16 | EHCI_INSNREG00_ENA_INCR8 | \
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EHCI_INSNREG00_ENA_INCR4 | EHCI_INSNREG00_ENA_INCRX_ALIGN)
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struct s5p_ehci_hcd {
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struct device *dev;
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struct usb_hcd *hcd;
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struct clk *clk;
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};
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static const struct hc_driver s5p_ehci_hc_driver = {
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.description = hcd_name,
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.product_desc = "S5P EHCI Host Controller",
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.hcd_priv_size = sizeof(struct ehci_hcd),
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.irq = ehci_irq,
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.flags = HCD_MEMORY | HCD_USB2,
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.reset = ehci_setup,
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.start = ehci_run,
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.stop = ehci_stop,
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.shutdown = ehci_shutdown,
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.get_frame_number = ehci_get_frame,
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.urb_enqueue = ehci_urb_enqueue,
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.urb_dequeue = ehci_urb_dequeue,
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.endpoint_disable = ehci_endpoint_disable,
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.endpoint_reset = ehci_endpoint_reset,
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.hub_status_data = ehci_hub_status_data,
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.hub_control = ehci_hub_control,
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.bus_suspend = ehci_bus_suspend,
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.bus_resume = ehci_bus_resume,
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.relinquish_port = ehci_relinquish_port,
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.port_handed_over = ehci_port_handed_over,
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.clear_tt_buffer_complete = ehci_clear_tt_buffer_complete,
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};
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static void s5p_setup_vbus_gpio(struct platform_device *pdev)
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{
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int err;
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int gpio;
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if (!pdev->dev.of_node)
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return;
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gpio = of_get_named_gpio(pdev->dev.of_node,
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"samsung,vbus-gpio", 0);
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if (!gpio_is_valid(gpio))
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return;
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err = gpio_request_one(gpio, GPIOF_OUT_INIT_HIGH, "ehci_vbus_gpio");
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if (err)
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dev_err(&pdev->dev, "can't request ehci vbus gpio %d", gpio);
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}
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static u64 ehci_s5p_dma_mask = DMA_BIT_MASK(32);
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static int s5p_ehci_probe(struct platform_device *pdev)
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{
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struct s5p_ehci_platdata *pdata;
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struct s5p_ehci_hcd *s5p_ehci;
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struct usb_hcd *hcd;
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struct ehci_hcd *ehci;
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struct resource *res;
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int irq;
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int err;
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pdata = pdev->dev.platform_data;
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if (!pdata) {
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dev_err(&pdev->dev, "No platform data defined\n");
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return -EINVAL;
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}
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/*
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* Right now device-tree probed devices don't get dma_mask set.
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* Since shared usb code relies on it, set it here for now.
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* Once we move to full device tree support this will vanish off.
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*/
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if (!pdev->dev.dma_mask)
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pdev->dev.dma_mask = &ehci_s5p_dma_mask;
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if (!pdev->dev.coherent_dma_mask)
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pdev->dev.coherent_dma_mask = DMA_BIT_MASK(32);
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s5p_setup_vbus_gpio(pdev);
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s5p_ehci = devm_kzalloc(&pdev->dev, sizeof(struct s5p_ehci_hcd),
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GFP_KERNEL);
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if (!s5p_ehci)
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return -ENOMEM;
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s5p_ehci->dev = &pdev->dev;
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hcd = usb_create_hcd(&s5p_ehci_hc_driver, &pdev->dev,
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dev_name(&pdev->dev));
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if (!hcd) {
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dev_err(&pdev->dev, "Unable to create HCD\n");
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return -ENOMEM;
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}
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s5p_ehci->hcd = hcd;
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s5p_ehci->clk = devm_clk_get(&pdev->dev, "usbhost");
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if (IS_ERR(s5p_ehci->clk)) {
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dev_err(&pdev->dev, "Failed to get usbhost clock\n");
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err = PTR_ERR(s5p_ehci->clk);
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goto fail_clk;
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}
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err = clk_prepare_enable(s5p_ehci->clk);
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if (err)
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goto fail_clk;
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res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
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if (!res) {
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dev_err(&pdev->dev, "Failed to get I/O memory\n");
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err = -ENXIO;
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goto fail_io;
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}
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hcd->rsrc_start = res->start;
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hcd->rsrc_len = resource_size(res);
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hcd->regs = devm_ioremap(&pdev->dev, res->start, hcd->rsrc_len);
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if (!hcd->regs) {
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dev_err(&pdev->dev, "Failed to remap I/O memory\n");
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err = -ENOMEM;
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goto fail_io;
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}
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irq = platform_get_irq(pdev, 0);
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if (!irq) {
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dev_err(&pdev->dev, "Failed to get IRQ\n");
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err = -ENODEV;
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goto fail_io;
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}
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if (pdata->phy_init)
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pdata->phy_init(pdev, S5P_USB_PHY_HOST);
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ehci = hcd_to_ehci(hcd);
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ehci->caps = hcd->regs;
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/* DMA burst Enable */
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writel(EHCI_INSNREG00_ENABLE_DMA_BURST, EHCI_INSNREG00(hcd->regs));
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err = usb_add_hcd(hcd, irq, IRQF_SHARED);
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if (err) {
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dev_err(&pdev->dev, "Failed to add USB HCD\n");
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goto fail_io;
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}
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platform_set_drvdata(pdev, s5p_ehci);
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return 0;
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fail_io:
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clk_disable_unprepare(s5p_ehci->clk);
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fail_clk:
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usb_put_hcd(hcd);
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return err;
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}
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static int s5p_ehci_remove(struct platform_device *pdev)
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{
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struct s5p_ehci_platdata *pdata = pdev->dev.platform_data;
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struct s5p_ehci_hcd *s5p_ehci = platform_get_drvdata(pdev);
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struct usb_hcd *hcd = s5p_ehci->hcd;
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usb_remove_hcd(hcd);
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if (pdata && pdata->phy_exit)
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pdata->phy_exit(pdev, S5P_USB_PHY_HOST);
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clk_disable_unprepare(s5p_ehci->clk);
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usb_put_hcd(hcd);
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return 0;
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}
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static void s5p_ehci_shutdown(struct platform_device *pdev)
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{
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struct s5p_ehci_hcd *s5p_ehci = platform_get_drvdata(pdev);
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struct usb_hcd *hcd = s5p_ehci->hcd;
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if (hcd->driver->shutdown)
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hcd->driver->shutdown(hcd);
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}
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#ifdef CONFIG_PM
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static int s5p_ehci_suspend(struct device *dev)
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{
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struct s5p_ehci_hcd *s5p_ehci = dev_get_drvdata(dev);
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struct usb_hcd *hcd = s5p_ehci->hcd;
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bool do_wakeup = device_may_wakeup(dev);
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struct platform_device *pdev = to_platform_device(dev);
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struct s5p_ehci_platdata *pdata = pdev->dev.platform_data;
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int rc;
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rc = ehci_suspend(hcd, do_wakeup);
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if (pdata && pdata->phy_exit)
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pdata->phy_exit(pdev, S5P_USB_PHY_HOST);
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clk_disable_unprepare(s5p_ehci->clk);
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return rc;
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}
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static int s5p_ehci_resume(struct device *dev)
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{
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struct s5p_ehci_hcd *s5p_ehci = dev_get_drvdata(dev);
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struct usb_hcd *hcd = s5p_ehci->hcd;
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struct platform_device *pdev = to_platform_device(dev);
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struct s5p_ehci_platdata *pdata = pdev->dev.platform_data;
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clk_prepare_enable(s5p_ehci->clk);
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if (pdata && pdata->phy_init)
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pdata->phy_init(pdev, S5P_USB_PHY_HOST);
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/* DMA burst Enable */
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writel(EHCI_INSNREG00_ENABLE_DMA_BURST, EHCI_INSNREG00(hcd->regs));
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ehci_resume(hcd, false);
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return 0;
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}
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#else
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#define s5p_ehci_suspend NULL
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#define s5p_ehci_resume NULL
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#endif
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static const struct dev_pm_ops s5p_ehci_pm_ops = {
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.suspend = s5p_ehci_suspend,
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.resume = s5p_ehci_resume,
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};
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#ifdef CONFIG_OF
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static const struct of_device_id exynos_ehci_match[] = {
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{ .compatible = "samsung,exynos-ehci" },
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{},
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};
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MODULE_DEVICE_TABLE(of, exynos_ehci_match);
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#endif
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static struct platform_driver s5p_ehci_driver = {
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.probe = s5p_ehci_probe,
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.remove = s5p_ehci_remove,
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.shutdown = s5p_ehci_shutdown,
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.driver = {
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.name = "s5p-ehci",
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.owner = THIS_MODULE,
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.pm = &s5p_ehci_pm_ops,
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.of_match_table = of_match_ptr(exynos_ehci_match),
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}
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};
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MODULE_ALIAS("platform:s5p-ehci");
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