linux/drivers/usb/host/ohci-spear.c
Linus Torvalds e6b5be2be4 Driver core patches for 3.19-rc1
Here's the set of driver core patches for 3.19-rc1.
 
 They are dominated by the removal of the .owner field in platform
 drivers.  They touch a lot of files, but they are "simple" changes, just
 removing a line in a structure.
 
 Other than that, a few minor driver core and debugfs changes.  There are
 some ath9k patches coming in through this tree that have been acked by
 the wireless maintainers as they relied on the debugfs changes.
 
 Everything has been in linux-next for a while.
 
 Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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Merge tag 'driver-core-3.19-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/driver-core

Pull driver core update from Greg KH:
 "Here's the set of driver core patches for 3.19-rc1.

  They are dominated by the removal of the .owner field in platform
  drivers.  They touch a lot of files, but they are "simple" changes,
  just removing a line in a structure.

  Other than that, a few minor driver core and debugfs changes.  There
  are some ath9k patches coming in through this tree that have been
  acked by the wireless maintainers as they relied on the debugfs
  changes.

  Everything has been in linux-next for a while"

* tag 'driver-core-3.19-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/driver-core: (324 commits)
  Revert "ath: ath9k: use debugfs_create_devm_seqfile() helper for seq_file entries"
  fs: debugfs: add forward declaration for struct device type
  firmware class: Deletion of an unnecessary check before the function call "vunmap"
  firmware loader: fix hung task warning dump
  devcoredump: provide a one-way disable function
  device: Add dev_<level>_once variants
  ath: ath9k: use debugfs_create_devm_seqfile() helper for seq_file entries
  ath: use seq_file api for ath9k debugfs files
  debugfs: add helper function to create device related seq_file
  drivers/base: cacheinfo: remove noisy error boot message
  Revert "core: platform: add warning if driver has no owner"
  drivers: base: support cpu cache information interface to userspace via sysfs
  drivers: base: add cpu_device_create to support per-cpu devices
  topology: replace custom attribute macros with standard DEVICE_ATTR*
  cpumask: factor out show_cpumap into separate helper function
  driver core: Fix unbalanced device reference in drivers_probe
  driver core: fix race with userland in device_add()
  sysfs/kernfs: make read requests on pre-alloc files use the buffer.
  sysfs/kernfs: allow attributes to request write buffer be pre-allocated.
  fs: sysfs: return EGBIG on write if offset is larger than file size
  ...
2014-12-14 16:10:09 -08:00

204 lines
4.8 KiB
C

/*
* OHCI HCD (Host Controller Driver) for USB.
*
* Copyright (C) 2010 ST Microelectronics.
* Deepak Sikri<deepak.sikri@st.com>
*
* Based on various ohci-*.c drivers
*
* This file is licensed under the terms of the GNU General Public
* License version 2. This program is licensed "as is" without any
* warranty of any kind, whether express or implied.
*/
#include <linux/clk.h>
#include <linux/dma-mapping.h>
#include <linux/io.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/of.h>
#include <linux/platform_device.h>
#include <linux/signal.h>
#include <linux/usb.h>
#include <linux/usb/hcd.h>
#include "ohci.h"
#define DRIVER_DESC "OHCI SPEAr driver"
static const char hcd_name[] = "SPEAr-ohci";
struct spear_ohci {
struct clk *clk;
};
#define to_spear_ohci(hcd) (struct spear_ohci *)(hcd_to_ohci(hcd)->priv)
static struct hc_driver __read_mostly ohci_spear_hc_driver;
static int spear_ohci_hcd_drv_probe(struct platform_device *pdev)
{
const struct hc_driver *driver = &ohci_spear_hc_driver;
struct ohci_hcd *ohci;
struct usb_hcd *hcd = NULL;
struct clk *usbh_clk;
struct spear_ohci *sohci_p;
struct resource *res;
int retval, irq;
irq = platform_get_irq(pdev, 0);
if (irq < 0) {
retval = irq;
goto fail;
}
/*
* Right now device-tree probed devices don't get dma_mask set.
* Since shared usb code relies on it, set it here for now.
* Once we have dma capability bindings this can go away.
*/
retval = dma_coerce_mask_and_coherent(&pdev->dev, DMA_BIT_MASK(32));
if (retval)
goto fail;
usbh_clk = devm_clk_get(&pdev->dev, NULL);
if (IS_ERR(usbh_clk)) {
dev_err(&pdev->dev, "Error getting interface clock\n");
retval = PTR_ERR(usbh_clk);
goto fail;
}
hcd = usb_create_hcd(driver, &pdev->dev, dev_name(&pdev->dev));
if (!hcd) {
retval = -ENOMEM;
goto fail;
}
res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
hcd->regs = devm_ioremap_resource(&pdev->dev, res);
if (IS_ERR(hcd->regs)) {
retval = PTR_ERR(hcd->regs);
goto err_put_hcd;
}
hcd->rsrc_start = pdev->resource[0].start;
hcd->rsrc_len = resource_size(res);
sohci_p = to_spear_ohci(hcd);
sohci_p->clk = usbh_clk;
clk_prepare_enable(sohci_p->clk);
ohci = hcd_to_ohci(hcd);
retval = usb_add_hcd(hcd, platform_get_irq(pdev, 0), 0);
if (retval == 0) {
device_wakeup_enable(hcd->self.controller);
return retval;
}
clk_disable_unprepare(sohci_p->clk);
err_put_hcd:
usb_put_hcd(hcd);
fail:
dev_err(&pdev->dev, "init fail, %d\n", retval);
return retval;
}
static int spear_ohci_hcd_drv_remove(struct platform_device *pdev)
{
struct usb_hcd *hcd = platform_get_drvdata(pdev);
struct spear_ohci *sohci_p = to_spear_ohci(hcd);
usb_remove_hcd(hcd);
if (sohci_p->clk)
clk_disable_unprepare(sohci_p->clk);
usb_put_hcd(hcd);
return 0;
}
#if defined(CONFIG_PM)
static int spear_ohci_hcd_drv_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 spear_ohci *sohci_p = to_spear_ohci(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;
clk_disable_unprepare(sohci_p->clk);
return ret;
}
static int spear_ohci_hcd_drv_resume(struct platform_device *dev)
{
struct usb_hcd *hcd = platform_get_drvdata(dev);
struct ohci_hcd *ohci = hcd_to_ohci(hcd);
struct spear_ohci *sohci_p = to_spear_ohci(hcd);
if (time_before(jiffies, ohci->next_statechange))
msleep(5);
ohci->next_statechange = jiffies;
clk_prepare_enable(sohci_p->clk);
ohci_resume(hcd, false);
return 0;
}
#endif
static const struct of_device_id spear_ohci_id_table[] = {
{ .compatible = "st,spear600-ohci", },
{ },
};
/* Driver definition to register with the platform bus */
static struct platform_driver spear_ohci_hcd_driver = {
.probe = spear_ohci_hcd_drv_probe,
.remove = spear_ohci_hcd_drv_remove,
#ifdef CONFIG_PM
.suspend = spear_ohci_hcd_drv_suspend,
.resume = spear_ohci_hcd_drv_resume,
#endif
.driver = {
.name = "spear-ohci",
.of_match_table = spear_ohci_id_table,
},
};
static const struct ohci_driver_overrides spear_overrides __initconst = {
.extra_priv_size = sizeof(struct spear_ohci),
};
static int __init ohci_spear_init(void)
{
if (usb_disabled())
return -ENODEV;
pr_info("%s: " DRIVER_DESC "\n", hcd_name);
ohci_init_driver(&ohci_spear_hc_driver, &spear_overrides);
return platform_driver_register(&spear_ohci_hcd_driver);
}
module_init(ohci_spear_init);
static void __exit ohci_spear_cleanup(void)
{
platform_driver_unregister(&spear_ohci_hcd_driver);
}
module_exit(ohci_spear_cleanup);
MODULE_DESCRIPTION(DRIVER_DESC);
MODULE_AUTHOR("Deepak Sikri");
MODULE_LICENSE("GPL v2");
MODULE_ALIAS("platform:spear-ohci");