diff options
Diffstat (limited to 'drivers/usb/host/ohci-s3c2410.c')
| -rw-r--r-- | drivers/usb/host/ohci-s3c2410.c | 500 |
1 files changed, 500 insertions, 0 deletions
diff --git a/drivers/usb/host/ohci-s3c2410.c b/drivers/usb/host/ohci-s3c2410.c new file mode 100644 index 000000000..4511e27e9 --- /dev/null +++ b/drivers/usb/host/ohci-s3c2410.c @@ -0,0 +1,500 @@ +// SPDX-License-Identifier: GPL-1.0+ +/* + * OHCI HCD (Host Controller Driver) for USB. + * + * (C) Copyright 1999 Roman Weissgaerber <weissg@vienna.at> + * (C) Copyright 2000-2002 David Brownell <dbrownell@users.sourceforge.net> + * (C) Copyright 2002 Hewlett-Packard Company + * + * USB Bus Glue for Samsung S3C2410 + * + * Written by Christopher Hoover <ch@hpl.hp.com> + * Based on fragments of previous driver by Russell King et al. + * + * Modified for S3C2410 from ohci-sa1111.c, ohci-omap.c and ohci-lh7a40.c + * by Ben Dooks, <ben@simtec.co.uk> + * Copyright (C) 2004 Simtec Electronics + * + * Thanks to basprog@mail.ru for updates to newer kernels + * + * This file is licenced under the GPL. +*/ + +#include <linux/clk.h> +#include <linux/io.h> +#include <linux/kernel.h> +#include <linux/module.h> +#include <linux/platform_device.h> +#include <linux/platform_data/usb-ohci-s3c2410.h> +#include <linux/usb.h> +#include <linux/usb/hcd.h> + +#include "ohci.h" + + +#define valid_port(idx) ((idx) == 1 || (idx) == 2) + +/* clock device associated with the hcd */ + + +#define DRIVER_DESC "OHCI S3C2410 driver" + +static const char hcd_name[] = "ohci-s3c2410"; + +static struct clk *clk; +static struct clk *usb_clk; + +static struct hc_driver __read_mostly ohci_s3c2410_hc_driver; + +/* forward definitions */ + +static void s3c2410_hcd_oc(struct s3c2410_hcd_info *info, int port_oc); + +/* conversion functions */ + +static struct s3c2410_hcd_info *to_s3c2410_info(struct usb_hcd *hcd) +{ + return dev_get_platdata(hcd->self.controller); +} + +static void s3c2410_start_hc(struct platform_device *dev, struct usb_hcd *hcd) +{ + struct s3c2410_hcd_info *info = dev_get_platdata(&dev->dev); + + dev_dbg(&dev->dev, "s3c2410_start_hc:\n"); + + clk_prepare_enable(usb_clk); + mdelay(2); /* let the bus clock stabilise */ + + clk_prepare_enable(clk); + + if (info != NULL) { + info->hcd = hcd; + info->report_oc = s3c2410_hcd_oc; + + if (info->enable_oc != NULL) + (info->enable_oc)(info, 1); + } +} + +static void s3c2410_stop_hc(struct platform_device *dev) +{ + struct s3c2410_hcd_info *info = dev_get_platdata(&dev->dev); + + dev_dbg(&dev->dev, "s3c2410_stop_hc:\n"); + + if (info != NULL) { + info->report_oc = NULL; + info->hcd = NULL; + + if (info->enable_oc != NULL) + (info->enable_oc)(info, 0); + } + + clk_disable_unprepare(clk); + clk_disable_unprepare(usb_clk); +} + +/* ohci_s3c2410_hub_status_data + * + * update the status data from the hub with anything that + * has been detected by our system +*/ + +static int +ohci_s3c2410_hub_status_data(struct usb_hcd *hcd, char *buf) +{ + struct s3c2410_hcd_info *info = to_s3c2410_info(hcd); + struct s3c2410_hcd_port *port; + int orig; + int portno; + + orig = ohci_hub_status_data(hcd, buf); + + if (info == NULL) + return orig; + + port = &info->port[0]; + + /* mark any changed port as changed */ + + for (portno = 0; portno < 2; port++, portno++) { + if (port->oc_changed == 1 && + port->flags & S3C_HCDFLG_USED) { + dev_dbg(hcd->self.controller, + "oc change on port %d\n", portno); + + if (orig < 1) + orig = 1; + + buf[0] |= 1<<(portno+1); + } + } + + return orig; +} + +/* s3c2410_usb_set_power + * + * configure the power on a port, by calling the platform device + * routine registered with the platform device +*/ + +static void s3c2410_usb_set_power(struct s3c2410_hcd_info *info, + int port, int to) +{ + if (info == NULL) + return; + + if (info->power_control != NULL) { + info->port[port-1].power = to; + (info->power_control)(port-1, to); + } +} + +/* ohci_s3c2410_hub_control + * + * look at control requests to the hub, and see if we need + * to take any action or over-ride the results from the + * request. +*/ + +static int ohci_s3c2410_hub_control( + struct usb_hcd *hcd, + u16 typeReq, + u16 wValue, + u16 wIndex, + char *buf, + u16 wLength) +{ + struct s3c2410_hcd_info *info = to_s3c2410_info(hcd); + struct usb_hub_descriptor *desc; + int ret = -EINVAL; + u32 *data = (u32 *)buf; + + dev_dbg(hcd->self.controller, + "s3c2410_hub_control(%p,0x%04x,0x%04x,0x%04x,%p,%04x)\n", + hcd, typeReq, wValue, wIndex, buf, wLength); + + /* if we are only an humble host without any special capabilities + * process the request straight away and exit */ + + if (info == NULL) { + ret = ohci_hub_control(hcd, typeReq, wValue, + wIndex, buf, wLength); + goto out; + } + + /* check the request to see if it needs handling */ + + switch (typeReq) { + case SetPortFeature: + if (wValue == USB_PORT_FEAT_POWER) { + dev_dbg(hcd->self.controller, "SetPortFeat: POWER\n"); + s3c2410_usb_set_power(info, wIndex, 1); + goto out; + } + break; + + case ClearPortFeature: + switch (wValue) { + case USB_PORT_FEAT_C_OVER_CURRENT: + dev_dbg(hcd->self.controller, + "ClearPortFeature: C_OVER_CURRENT\n"); + + if (valid_port(wIndex)) { + info->port[wIndex-1].oc_changed = 0; + info->port[wIndex-1].oc_status = 0; + } + + goto out; + + case USB_PORT_FEAT_OVER_CURRENT: + dev_dbg(hcd->self.controller, + "ClearPortFeature: OVER_CURRENT\n"); + + if (valid_port(wIndex)) + info->port[wIndex-1].oc_status = 0; + + goto out; + + case USB_PORT_FEAT_POWER: + dev_dbg(hcd->self.controller, + "ClearPortFeature: POWER\n"); + + if (valid_port(wIndex)) { + s3c2410_usb_set_power(info, wIndex, 0); + return 0; + } + } + break; + } + + ret = ohci_hub_control(hcd, typeReq, wValue, wIndex, buf, wLength); + if (ret) + goto out; + + switch (typeReq) { + case GetHubDescriptor: + + /* update the hub's descriptor */ + + desc = (struct usb_hub_descriptor *)buf; + + if (info->power_control == NULL) + return ret; + + dev_dbg(hcd->self.controller, "wHubCharacteristics 0x%04x\n", + desc->wHubCharacteristics); + + /* remove the old configurations for power-switching, and + * over-current protection, and insert our new configuration + */ + + desc->wHubCharacteristics &= ~cpu_to_le16(HUB_CHAR_LPSM); + desc->wHubCharacteristics |= cpu_to_le16( + HUB_CHAR_INDV_PORT_LPSM); + + if (info->enable_oc) { + desc->wHubCharacteristics &= ~cpu_to_le16( + HUB_CHAR_OCPM); + desc->wHubCharacteristics |= cpu_to_le16( + HUB_CHAR_INDV_PORT_OCPM); + } + + dev_dbg(hcd->self.controller, "wHubCharacteristics after 0x%04x\n", + desc->wHubCharacteristics); + + return ret; + + case GetPortStatus: + /* check port status */ + + dev_dbg(hcd->self.controller, "GetPortStatus(%d)\n", wIndex); + + if (valid_port(wIndex)) { + if (info->port[wIndex-1].oc_changed) + *data |= cpu_to_le32(RH_PS_OCIC); + + if (info->port[wIndex-1].oc_status) + *data |= cpu_to_le32(RH_PS_POCI); + } + } + + out: + return ret; +} + +/* s3c2410_hcd_oc + * + * handle an over-current report +*/ + +static void s3c2410_hcd_oc(struct s3c2410_hcd_info *info, int port_oc) +{ + struct s3c2410_hcd_port *port; + struct usb_hcd *hcd; + unsigned long flags; + int portno; + + if (info == NULL) + return; + + port = &info->port[0]; + hcd = info->hcd; + + local_irq_save(flags); + + for (portno = 0; portno < 2; port++, portno++) { + if (port_oc & (1<<portno) && + port->flags & S3C_HCDFLG_USED) { + port->oc_status = 1; + port->oc_changed = 1; + + /* ok, once over-current is detected, + the port needs to be powered down */ + s3c2410_usb_set_power(info, portno+1, 0); + } + } + + local_irq_restore(flags); +} + +/* may be called without controller electrically present */ +/* may be called with controller, bus, and devices active */ + +/* + * ohci_hcd_s3c2410_remove - shutdown processing for HCD + * @dev: USB Host Controller being removed + * Context: !in_interrupt() + * + * Reverses the effect of ohci_hcd_3c2410_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_s3c2410_remove(struct platform_device *dev) +{ + struct usb_hcd *hcd = platform_get_drvdata(dev); + + usb_remove_hcd(hcd); + s3c2410_stop_hc(dev); + usb_put_hcd(hcd); + return 0; +} + +/** + * ohci_hcd_s3c2410_probe - initialize S3C2410-based HCDs + * Context: !in_interrupt() + * + * 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_s3c2410_probe(struct platform_device *dev) +{ + struct usb_hcd *hcd = NULL; + struct s3c2410_hcd_info *info = dev_get_platdata(&dev->dev); + int retval; + + s3c2410_usb_set_power(info, 1, 1); + s3c2410_usb_set_power(info, 2, 1); + + hcd = usb_create_hcd(&ohci_s3c2410_hc_driver, &dev->dev, "s3c24xx"); + if (hcd == NULL) + return -ENOMEM; + + hcd->rsrc_start = dev->resource[0].start; + hcd->rsrc_len = resource_size(&dev->resource[0]); + + hcd->regs = devm_ioremap_resource(&dev->dev, &dev->resource[0]); + if (IS_ERR(hcd->regs)) { + retval = PTR_ERR(hcd->regs); + goto err_put; + } + + clk = devm_clk_get(&dev->dev, "usb-host"); + if (IS_ERR(clk)) { + dev_err(&dev->dev, "cannot get usb-host clock\n"); + retval = PTR_ERR(clk); + goto err_put; + } + + usb_clk = devm_clk_get(&dev->dev, "usb-bus-host"); + if (IS_ERR(usb_clk)) { + dev_err(&dev->dev, "cannot get usb-bus-host clock\n"); + retval = PTR_ERR(usb_clk); + goto err_put; + } + + s3c2410_start_hc(dev, hcd); + + retval = usb_add_hcd(hcd, dev->resource[1].start, 0); + if (retval != 0) + goto err_ioremap; + + device_wakeup_enable(hcd->self.controller); + return 0; + + err_ioremap: + s3c2410_stop_hc(dev); + + err_put: + usb_put_hcd(hcd); + return retval; +} + +/*-------------------------------------------------------------------------*/ + +#ifdef CONFIG_PM +static int ohci_hcd_s3c2410_drv_suspend(struct device *dev) +{ + struct usb_hcd *hcd = dev_get_drvdata(dev); + struct platform_device *pdev = to_platform_device(dev); + bool do_wakeup = device_may_wakeup(dev); + int rc = 0; + + rc = ohci_suspend(hcd, do_wakeup); + if (rc) + return rc; + + s3c2410_stop_hc(pdev); + + return rc; +} + +static int ohci_hcd_s3c2410_drv_resume(struct device *dev) +{ + struct usb_hcd *hcd = dev_get_drvdata(dev); + struct platform_device *pdev = to_platform_device(dev); + + s3c2410_start_hc(pdev, hcd); + + ohci_resume(hcd, false); + + return 0; +} +#else +#define ohci_hcd_s3c2410_drv_suspend NULL +#define ohci_hcd_s3c2410_drv_resume NULL +#endif + +static const struct dev_pm_ops ohci_hcd_s3c2410_pm_ops = { + .suspend = ohci_hcd_s3c2410_drv_suspend, + .resume = ohci_hcd_s3c2410_drv_resume, +}; + +static const struct of_device_id ohci_hcd_s3c2410_dt_ids[] = { + { .compatible = "samsung,s3c2410-ohci" }, + { /* sentinel */ } +}; + +MODULE_DEVICE_TABLE(of, ohci_hcd_s3c2410_dt_ids); + +static struct platform_driver ohci_hcd_s3c2410_driver = { + .probe = ohci_hcd_s3c2410_probe, + .remove = ohci_hcd_s3c2410_remove, + .shutdown = usb_hcd_platform_shutdown, + .driver = { + .name = "s3c2410-ohci", + .pm = &ohci_hcd_s3c2410_pm_ops, + .of_match_table = ohci_hcd_s3c2410_dt_ids, + }, +}; + +static int __init ohci_s3c2410_init(void) +{ + if (usb_disabled()) + return -ENODEV; + + pr_info("%s: " DRIVER_DESC "\n", hcd_name); + ohci_init_driver(&ohci_s3c2410_hc_driver, NULL); + + /* + * The Samsung HW has some unusual quirks, which require + * Sumsung-specific workarounds. We override certain hc_driver + * functions here to achieve that. We explicitly do not enhance + * ohci_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. + */ + + ohci_s3c2410_hc_driver.hub_status_data = ohci_s3c2410_hub_status_data; + ohci_s3c2410_hc_driver.hub_control = ohci_s3c2410_hub_control; + + return platform_driver_register(&ohci_hcd_s3c2410_driver); +} +module_init(ohci_s3c2410_init); + +static void __exit ohci_s3c2410_cleanup(void) +{ + platform_driver_unregister(&ohci_hcd_s3c2410_driver); +} +module_exit(ohci_s3c2410_cleanup); + +MODULE_DESCRIPTION(DRIVER_DESC); +MODULE_LICENSE("GPL"); +MODULE_ALIAS("platform:s3c2410-ohci"); |