diff options
Diffstat (limited to 'drivers/usb/host/ohci-omap.c')
| -rw-r--r-- | drivers/usb/host/ohci-omap.c | 439 |
1 files changed, 439 insertions, 0 deletions
diff --git a/drivers/usb/host/ohci-omap.c b/drivers/usb/host/ohci-omap.c new file mode 100644 index 000000000..cb29701df --- /dev/null +++ b/drivers/usb/host/ohci-omap.c @@ -0,0 +1,439 @@ +// SPDX-License-Identifier: GPL-1.0+ +/* + * OHCI HCD (Host Controller Driver) for USB. + * + * (C) Copyright 1999 Roman Weissgaerber <weissg@vienna.at> + * (C) Copyright 2000-2005 David Brownell + * (C) Copyright 2002 Hewlett-Packard Company + * + * OMAP Bus Glue + * + * Modified for OMAP by Tony Lindgren <tony@atomide.com> + * Based on the 2.4 OMAP OHCI driver originally done by MontaVista Software Inc. + * and on ohci-sa1111.c by Christopher Hoover <ch@hpl.hp.com> + * + * This file is licenced under the GPL. + */ + +#include <linux/clk.h> +#include <linux/dma-mapping.h> +#include <linux/err.h> +#include <linux/gpio/consumer.h> +#include <linux/io.h> +#include <linux/jiffies.h> +#include <linux/kernel.h> +#include <linux/module.h> +#include <linux/usb/otg.h> +#include <linux/platform_device.h> +#include <linux/platform_data/usb-omap1.h> +#include <linux/soc/ti/omap1-usb.h> +#include <linux/soc/ti/omap1-mux.h> +#include <linux/soc/ti/omap1-soc.h> +#include <linux/soc/ti/omap1-io.h> +#include <linux/signal.h> +#include <linux/usb.h> +#include <linux/usb/hcd.h> + +#include "ohci.h" + +#include <asm/io.h> +#include <asm/mach-types.h> + +#define DRIVER_DESC "OHCI OMAP driver" + +struct ohci_omap_priv { + struct clk *usb_host_ck; + struct clk *usb_dc_ck; + struct gpio_desc *power; + struct gpio_desc *overcurrent; +}; + +static const char hcd_name[] = "ohci-omap"; +static struct hc_driver __read_mostly ohci_omap_hc_driver; + +#define hcd_to_ohci_omap_priv(h) \ + ((struct ohci_omap_priv *)hcd_to_ohci(h)->priv) + +static void omap_ohci_clock_power(struct ohci_omap_priv *priv, int on) +{ + if (on) { + clk_enable(priv->usb_dc_ck); + clk_enable(priv->usb_host_ck); + /* guesstimate for T5 == 1x 32K clock + APLL lock time */ + udelay(100); + } else { + clk_disable(priv->usb_host_ck); + clk_disable(priv->usb_dc_ck); + } +} + +#ifdef CONFIG_USB_OTG + +static void start_hnp(struct ohci_hcd *ohci) +{ + struct usb_hcd *hcd = ohci_to_hcd(ohci); + const unsigned port = hcd->self.otg_port - 1; + unsigned long flags; + u32 l; + + otg_start_hnp(hcd->usb_phy->otg); + + local_irq_save(flags); + hcd->usb_phy->otg->state = OTG_STATE_A_SUSPEND; + writel (RH_PS_PSS, &ohci->regs->roothub.portstatus [port]); + l = omap_readl(OTG_CTRL); + l &= ~OTG_A_BUSREQ; + omap_writel(l, OTG_CTRL); + local_irq_restore(flags); +} + +#endif + +/*-------------------------------------------------------------------------*/ + +static int ohci_omap_reset(struct usb_hcd *hcd) +{ + struct ohci_hcd *ohci = hcd_to_ohci(hcd); + struct omap_usb_config *config = dev_get_platdata(hcd->self.controller); + struct ohci_omap_priv *priv = hcd_to_ohci_omap_priv(hcd); + int need_transceiver = (config->otg != 0); + int ret; + + dev_dbg(hcd->self.controller, "starting USB Controller\n"); + + if (config->otg) { + hcd->self.otg_port = config->otg; + /* default/minimum OTG power budget: 8 mA */ + hcd->power_budget = 8; + } + + /* boards can use OTG transceivers in non-OTG modes */ + need_transceiver = need_transceiver + || machine_is_omap_h2() || machine_is_omap_h3(); + + /* XXX OMAP16xx only */ + if (config->ocpi_enable) + config->ocpi_enable(); + +#ifdef CONFIG_USB_OTG + if (need_transceiver) { + hcd->usb_phy = usb_get_phy(USB_PHY_TYPE_USB2); + if (!IS_ERR_OR_NULL(hcd->usb_phy)) { + int status = otg_set_host(hcd->usb_phy->otg, + &ohci_to_hcd(ohci)->self); + dev_dbg(hcd->self.controller, "init %s phy, status %d\n", + hcd->usb_phy->label, status); + if (status) { + usb_put_phy(hcd->usb_phy); + return status; + } + } else { + return -EPROBE_DEFER; + } + hcd->skip_phy_initialization = 1; + ohci->start_hnp = start_hnp; + } +#endif + + omap_ohci_clock_power(priv, 1); + + if (config->lb_reset) + config->lb_reset(); + + ret = ohci_setup(hcd); + if (ret < 0) + return ret; + + if (config->otg || config->rwc) { + ohci->hc_control = OHCI_CTRL_RWC; + writel(OHCI_CTRL_RWC, &ohci->regs->control); + } + + /* board-specific power switching and overcurrent support */ + if (machine_is_omap_osk() || machine_is_omap_innovator()) { + u32 rh = roothub_a (ohci); + + /* power switching (ganged by default) */ + rh &= ~RH_A_NPS; + + /* TPS2045 switch for internal transceiver (port 1) */ + if (machine_is_omap_osk()) { + ohci_to_hcd(ohci)->power_budget = 250; + + rh &= ~RH_A_NOCP; + + /* gpio9 for overcurrent detction */ + omap_cfg_reg(W8_1610_GPIO9); + + /* for paranoia's sake: disable USB.PUEN */ + omap_cfg_reg(W4_USB_HIGHZ); + } + ohci_writel(ohci, rh, &ohci->regs->roothub.a); + ohci->flags &= ~OHCI_QUIRK_HUB_POWER; + } else if (machine_is_nokia770()) { + /* We require a self-powered hub, which should have + * plenty of power. */ + ohci_to_hcd(ohci)->power_budget = 0; + } + + /* FIXME hub_wq hub requests should manage power switching */ + if (config->transceiver_power) + return config->transceiver_power(1); + + if (priv->power) + gpiod_set_value_cansleep(priv->power, 0); + + /* board init will have already handled HMC and mux setup. + * any external transceiver should already be initialized + * too, so all configured ports use the right signaling now. + */ + + return 0; +} + +/*-------------------------------------------------------------------------*/ + +/** + * ohci_hcd_omap_probe - initialize OMAP-based HCDs + * @pdev: USB controller to probe + * + * Context: task context, might sleep + * + * Allocates basic resources for this USB host controller, and + * then invokes the start() method for the HCD associated with it + * through the hotplug entry's driver_data. + */ +static int ohci_hcd_omap_probe(struct platform_device *pdev) +{ + int retval, irq; + struct usb_hcd *hcd = 0; + struct ohci_omap_priv *priv; + + if (pdev->num_resources != 2) { + dev_err(&pdev->dev, "invalid num_resources: %i\n", + pdev->num_resources); + return -ENODEV; + } + + if (pdev->resource[0].flags != IORESOURCE_MEM + || pdev->resource[1].flags != IORESOURCE_IRQ) { + dev_err(&pdev->dev, "invalid resource type\n"); + return -ENODEV; + } + + hcd = usb_create_hcd(&ohci_omap_hc_driver, &pdev->dev, + dev_name(&pdev->dev)); + if (!hcd) + return -ENOMEM; + + hcd->rsrc_start = pdev->resource[0].start; + hcd->rsrc_len = pdev->resource[0].end - pdev->resource[0].start + 1; + priv = hcd_to_ohci_omap_priv(hcd); + + /* Obtain two optional GPIO lines */ + priv->power = devm_gpiod_get_optional(&pdev->dev, "power", GPIOD_ASIS); + if (IS_ERR(priv->power)) { + retval = PTR_ERR(priv->power); + goto err_put_hcd; + } + if (priv->power) + gpiod_set_consumer_name(priv->power, "OHCI power"); + + /* + * This "overcurrent" GPIO line isn't really used in the code, + * but has a designated hardware function. + * TODO: implement proper overcurrent handling. + */ + priv->overcurrent = devm_gpiod_get_optional(&pdev->dev, "overcurrent", + GPIOD_IN); + if (IS_ERR(priv->overcurrent)) { + retval = PTR_ERR(priv->overcurrent); + goto err_put_hcd; + } + if (priv->overcurrent) + gpiod_set_consumer_name(priv->overcurrent, "OHCI overcurrent"); + + priv->usb_host_ck = clk_get(&pdev->dev, "usb_hhc_ck"); + if (IS_ERR(priv->usb_host_ck)) { + retval = PTR_ERR(priv->usb_host_ck); + goto err_put_hcd; + } + + retval = clk_prepare(priv->usb_host_ck); + if (retval) + goto err_put_host_ck; + + if (!cpu_is_omap15xx()) + priv->usb_dc_ck = clk_get(&pdev->dev, "usb_dc_ck"); + else + priv->usb_dc_ck = clk_get(&pdev->dev, "lb_ck"); + + if (IS_ERR(priv->usb_dc_ck)) { + retval = PTR_ERR(priv->usb_dc_ck); + goto err_unprepare_host_ck; + } + + retval = clk_prepare(priv->usb_dc_ck); + if (retval) + goto err_put_dc_ck; + + if (!request_mem_region(hcd->rsrc_start, hcd->rsrc_len, hcd_name)) { + dev_dbg(&pdev->dev, "request_mem_region failed\n"); + retval = -EBUSY; + goto err_unprepare_dc_ck; + } + + hcd->regs = ioremap(hcd->rsrc_start, hcd->rsrc_len); + if (!hcd->regs) { + dev_err(&pdev->dev, "can't ioremap OHCI HCD\n"); + retval = -ENOMEM; + goto err2; + } + + irq = platform_get_irq(pdev, 0); + if (irq < 0) { + retval = irq; + goto err3; + } + retval = usb_add_hcd(hcd, irq, 0); + if (retval) + goto err3; + + device_wakeup_enable(hcd->self.controller); + return 0; +err3: + iounmap(hcd->regs); +err2: + release_mem_region(hcd->rsrc_start, hcd->rsrc_len); +err_unprepare_dc_ck: + clk_unprepare(priv->usb_dc_ck); +err_put_dc_ck: + clk_put(priv->usb_dc_ck); +err_unprepare_host_ck: + clk_unprepare(priv->usb_host_ck); +err_put_host_ck: + clk_put(priv->usb_host_ck); +err_put_hcd: + usb_put_hcd(hcd); + return retval; +} + + +/* may be called with controller, bus, and devices active */ + +/** + * ohci_hcd_omap_remove - shutdown processing for OMAP-based HCDs + * @pdev: USB Host Controller being removed + * + * Context: task context, might sleep + * + * Reverses the effect of ohci_hcd_omap_probe(), first invoking + * the HCD's stop() method. It is always called from a thread + * context, normally "rmmod", "apmd", or something similar. + */ +static int ohci_hcd_omap_remove(struct platform_device *pdev) +{ + struct usb_hcd *hcd = platform_get_drvdata(pdev); + struct ohci_omap_priv *priv = hcd_to_ohci_omap_priv(hcd); + + dev_dbg(hcd->self.controller, "stopping USB Controller\n"); + usb_remove_hcd(hcd); + omap_ohci_clock_power(priv, 0); + if (!IS_ERR_OR_NULL(hcd->usb_phy)) { + (void) otg_set_host(hcd->usb_phy->otg, 0); + usb_put_phy(hcd->usb_phy); + } + iounmap(hcd->regs); + release_mem_region(hcd->rsrc_start, hcd->rsrc_len); + clk_unprepare(priv->usb_dc_ck); + clk_put(priv->usb_dc_ck); + clk_unprepare(priv->usb_host_ck); + clk_put(priv->usb_host_ck); + usb_put_hcd(hcd); + return 0; +} + +/*-------------------------------------------------------------------------*/ + +#ifdef CONFIG_PM + +static int ohci_omap_suspend(struct platform_device *pdev, pm_message_t message) +{ + struct usb_hcd *hcd = platform_get_drvdata(pdev); + struct ohci_hcd *ohci = hcd_to_ohci(hcd); + struct ohci_omap_priv *priv = hcd_to_ohci_omap_priv(hcd); + bool do_wakeup = device_may_wakeup(&pdev->dev); + int ret; + + if (time_before(jiffies, ohci->next_statechange)) + msleep(5); + ohci->next_statechange = jiffies; + + ret = ohci_suspend(hcd, do_wakeup); + if (ret) + return ret; + + omap_ohci_clock_power(priv, 0); + return ret; +} + +static int ohci_omap_resume(struct platform_device *dev) +{ + struct usb_hcd *hcd = platform_get_drvdata(dev); + struct ohci_hcd *ohci = hcd_to_ohci(hcd); + struct ohci_omap_priv *priv = hcd_to_ohci_omap_priv(hcd); + + if (time_before(jiffies, ohci->next_statechange)) + msleep(5); + ohci->next_statechange = jiffies; + + omap_ohci_clock_power(priv, 1); + ohci_resume(hcd, false); + return 0; +} + +#endif + +/*-------------------------------------------------------------------------*/ + +/* + * Driver definition to register with the OMAP bus + */ +static struct platform_driver ohci_hcd_omap_driver = { + .probe = ohci_hcd_omap_probe, + .remove = ohci_hcd_omap_remove, + .shutdown = usb_hcd_platform_shutdown, +#ifdef CONFIG_PM + .suspend = ohci_omap_suspend, + .resume = ohci_omap_resume, +#endif + .driver = { + .name = "ohci", + }, +}; + +static const struct ohci_driver_overrides omap_overrides __initconst = { + .product_desc = "OMAP OHCI", + .reset = ohci_omap_reset, + .extra_priv_size = sizeof(struct ohci_omap_priv), +}; + +static int __init ohci_omap_init(void) +{ + if (usb_disabled()) + return -ENODEV; + + ohci_init_driver(&ohci_omap_hc_driver, &omap_overrides); + return platform_driver_register(&ohci_hcd_omap_driver); +} +module_init(ohci_omap_init); + +static void __exit ohci_omap_cleanup(void) +{ + platform_driver_unregister(&ohci_hcd_omap_driver); +} +module_exit(ohci_omap_cleanup); + +MODULE_DESCRIPTION(DRIVER_DESC); +MODULE_ALIAS("platform:ohci"); +MODULE_LICENSE("GPL"); |