diff options
Diffstat (limited to 'drivers/usb/host/ehci-s5p.c')
| -rw-r--r-- | drivers/usb/host/ehci-s5p.c | 313 |
1 files changed, 313 insertions, 0 deletions
diff --git a/drivers/usb/host/ehci-s5p.c b/drivers/usb/host/ehci-s5p.c new file mode 100644 index 00000000..f098e2a2 --- /dev/null +++ b/drivers/usb/host/ehci-s5p.c @@ -0,0 +1,313 @@ +/* + * SAMSUNG S5P USB HOST EHCI Controller + * + * Copyright (C) 2011 Samsung Electronics Co.Ltd + * Author: Jingoo Han <jg1.han@samsung.com> + * Author: Joonyoung Shim <jy0922.shim@samsung.com> + * + * 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. + * + */ + +#include <linux/clk.h> +#include <linux/platform_device.h> +#include <plat/ehci.h> +#include <plat/usb-phy.h> + +#define EHCI_INSNREG00(base) (base + 0x90) +#define EHCI_INSNREG00_ENA_INCR16 (0x1 << 25) +#define EHCI_INSNREG00_ENA_INCR8 (0x1 << 24) +#define EHCI_INSNREG00_ENA_INCR4 (0x1 << 23) +#define EHCI_INSNREG00_ENA_INCRX_ALIGN (0x1 << 22) +#define EHCI_INSNREG00_ENABLE_DMA_BURST \ + (EHCI_INSNREG00_ENA_INCR16 | EHCI_INSNREG00_ENA_INCR8 | \ + EHCI_INSNREG00_ENA_INCR4 | EHCI_INSNREG00_ENA_INCRX_ALIGN) + +struct s5p_ehci_hcd { + struct device *dev; + struct usb_hcd *hcd; + struct clk *clk; +}; + +static const struct hc_driver s5p_ehci_hc_driver = { + .description = hcd_name, + .product_desc = "S5P EHCI Host Controller", + .hcd_priv_size = sizeof(struct ehci_hcd), + + .irq = ehci_irq, + .flags = HCD_MEMORY | HCD_USB2, + + .reset = ehci_init, + .start = ehci_run, + .stop = ehci_stop, + .shutdown = ehci_shutdown, + + .get_frame_number = ehci_get_frame, + + .urb_enqueue = ehci_urb_enqueue, + .urb_dequeue = ehci_urb_dequeue, + .endpoint_disable = ehci_endpoint_disable, + .endpoint_reset = ehci_endpoint_reset, + + .hub_status_data = ehci_hub_status_data, + .hub_control = ehci_hub_control, + .bus_suspend = ehci_bus_suspend, + .bus_resume = ehci_bus_resume, + + .relinquish_port = ehci_relinquish_port, + .port_handed_over = ehci_port_handed_over, + + .clear_tt_buffer_complete = ehci_clear_tt_buffer_complete, +}; + +static int __devinit s5p_ehci_probe(struct platform_device *pdev) +{ + struct s5p_ehci_platdata *pdata; + struct s5p_ehci_hcd *s5p_ehci; + struct usb_hcd *hcd; + struct ehci_hcd *ehci; + struct resource *res; + int irq; + int err; + + pdata = pdev->dev.platform_data; + if (!pdata) { + dev_err(&pdev->dev, "No platform data defined\n"); + return -EINVAL; + } + + s5p_ehci = kzalloc(sizeof(struct s5p_ehci_hcd), GFP_KERNEL); + if (!s5p_ehci) + return -ENOMEM; + + s5p_ehci->dev = &pdev->dev; + + hcd = usb_create_hcd(&s5p_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; + } + + s5p_ehci->hcd = hcd; + s5p_ehci->clk = clk_get(&pdev->dev, "usbhost"); + + if (IS_ERR(s5p_ehci->clk)) { + dev_err(&pdev->dev, "Failed to get usbhost clock\n"); + err = PTR_ERR(s5p_ehci->clk); + goto fail_clk; + } + + err = clk_enable(s5p_ehci->clk); + if (err) + goto fail_clken; + + 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; + } + + irq = platform_get_irq(pdev, 0); + if (!irq) { + dev_err(&pdev->dev, "Failed to get IRQ\n"); + err = -ENODEV; + goto fail; + } + + if (pdata->phy_init) + pdata->phy_init(pdev, S5P_USB_PHY_HOST); + + ehci = hcd_to_ehci(hcd); + ehci->caps = hcd->regs; + ehci->regs = hcd->regs + + HC_LENGTH(ehci, readl(&ehci->caps->hc_capbase)); + + /* DMA burst Enable */ + writel(EHCI_INSNREG00_ENABLE_DMA_BURST, EHCI_INSNREG00(hcd->regs)); + + 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); + + ehci_reset(ehci); + + err = usb_add_hcd(hcd, irq, IRQF_SHARED); + if (err) { + dev_err(&pdev->dev, "Failed to add USB HCD\n"); + goto fail; + } + + platform_set_drvdata(pdev, s5p_ehci); + + return 0; + +fail: + iounmap(hcd->regs); +fail_io: + clk_disable(s5p_ehci->clk); +fail_clken: + clk_put(s5p_ehci->clk); +fail_clk: + usb_put_hcd(hcd); +fail_hcd: + kfree(s5p_ehci); + return err; +} + +static int __devexit s5p_ehci_remove(struct platform_device *pdev) +{ + struct s5p_ehci_platdata *pdata = pdev->dev.platform_data; + struct s5p_ehci_hcd *s5p_ehci = platform_get_drvdata(pdev); + struct usb_hcd *hcd = s5p_ehci->hcd; + + usb_remove_hcd(hcd); + + if (pdata && pdata->phy_exit) + pdata->phy_exit(pdev, S5P_USB_PHY_HOST); + + iounmap(hcd->regs); + + clk_disable(s5p_ehci->clk); + clk_put(s5p_ehci->clk); + + usb_put_hcd(hcd); + kfree(s5p_ehci); + + return 0; +} + +static void s5p_ehci_shutdown(struct platform_device *pdev) +{ + struct s5p_ehci_hcd *s5p_ehci = platform_get_drvdata(pdev); + struct usb_hcd *hcd = s5p_ehci->hcd; + + if (hcd->driver->shutdown) + hcd->driver->shutdown(hcd); +} + +#ifdef CONFIG_PM +static int s5p_ehci_suspend(struct device *dev) +{ + struct s5p_ehci_hcd *s5p_ehci = dev_get_drvdata(dev); + struct usb_hcd *hcd = s5p_ehci->hcd; + struct ehci_hcd *ehci = hcd_to_ehci(hcd); + struct platform_device *pdev = to_platform_device(dev); + struct s5p_ehci_platdata *pdata = pdev->dev.platform_data; + unsigned long flags; + int rc = 0; + + if (time_before(jiffies, ehci->next_statechange)) + msleep(20); + + /* + * Root hub was already suspended. Disable irq emission and + * mark HW unaccessible. The PM and USB cores make sure that + * the root hub is either suspended or stopped. + */ + ehci_prepare_ports_for_controller_suspend(ehci, device_may_wakeup(dev)); + spin_lock_irqsave(&ehci->lock, flags); + ehci_writel(ehci, 0, &ehci->regs->intr_enable); + (void)ehci_readl(ehci, &ehci->regs->intr_enable); + + clear_bit(HCD_FLAG_HW_ACCESSIBLE, &hcd->flags); + spin_unlock_irqrestore(&ehci->lock, flags); + + if (pdata && pdata->phy_exit) + pdata->phy_exit(pdev, S5P_USB_PHY_HOST); + + return rc; +} + +static int s5p_ehci_resume(struct device *dev) +{ + struct s5p_ehci_hcd *s5p_ehci = dev_get_drvdata(dev); + struct usb_hcd *hcd = s5p_ehci->hcd; + struct ehci_hcd *ehci = hcd_to_ehci(hcd); + struct platform_device *pdev = to_platform_device(dev); + struct s5p_ehci_platdata *pdata = pdev->dev.platform_data; + + if (pdata && pdata->phy_init) + pdata->phy_init(pdev, S5P_USB_PHY_HOST); + + /* DMA burst Enable */ + writel(EHCI_INSNREG00_ENABLE_DMA_BURST, EHCI_INSNREG00(hcd->regs)); + + if (time_before(jiffies, ehci->next_statechange)) + msleep(100); + + /* Mark hardware accessible again as we are out of D3 state by now */ + set_bit(HCD_FLAG_HW_ACCESSIBLE, &hcd->flags); + + if (ehci_readl(ehci, &ehci->regs->configured_flag) == FLAG_CF) { + int mask = INTR_MASK; + + ehci_prepare_ports_for_controller_resume(ehci); + if (!hcd->self.root_hub->do_remote_wakeup) + mask &= ~STS_PCD; + ehci_writel(ehci, mask, &ehci->regs->intr_enable); + ehci_readl(ehci, &ehci->regs->intr_enable); + return 0; + } + + usb_root_hub_lost_power(hcd->self.root_hub); + + (void) ehci_halt(ehci); + (void) ehci_reset(ehci); + + /* emptying the schedule aborts any urbs */ + spin_lock_irq(&ehci->lock); + if (ehci->reclaim) + end_unlink_async(ehci); + ehci_work(ehci); + spin_unlock_irq(&ehci->lock); + + ehci_writel(ehci, ehci->command, &ehci->regs->command); + ehci_writel(ehci, FLAG_CF, &ehci->regs->configured_flag); + ehci_readl(ehci, &ehci->regs->command); /* unblock posted writes */ + + /* here we "know" root ports should always stay powered */ + ehci_port_power(ehci, 1); + + ehci->rh_state = EHCI_RH_SUSPENDED; + + return 0; +} +#else +#define s5p_ehci_suspend NULL +#define s5p_ehci_resume NULL +#endif + +static const struct dev_pm_ops s5p_ehci_pm_ops = { + .suspend = s5p_ehci_suspend, + .resume = s5p_ehci_resume, +}; + +static struct platform_driver s5p_ehci_driver = { + .probe = s5p_ehci_probe, + .remove = __devexit_p(s5p_ehci_remove), + .shutdown = s5p_ehci_shutdown, + .driver = { + .name = "s5p-ehci", + .owner = THIS_MODULE, + .pm = &s5p_ehci_pm_ops, + } +}; + +MODULE_ALIAS("platform:s5p-ehci"); |