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/*
* 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/signal.h>
#include <linux/platform_device.h>
#include <linux/clk.h>
#include <linux/of.h>
struct spear_ohci {
struct ohci_hcd ohci;
struct clk *clk;
};
#define to_spear_ohci(hcd) (struct spear_ohci *)hcd_to_ohci(hcd)
static void spear_start_ohci(struct spear_ohci *ohci)
{
clk_prepare_enable(ohci->clk);
}
static void spear_stop_ohci(struct spear_ohci *ohci)
{
clk_disable_unprepare(ohci->clk);
}
static int ohci_spear_start(struct usb_hcd *hcd)
{
struct ohci_hcd *ohci = hcd_to_ohci(hcd);
int ret;
ret = ohci_init(ohci);
if (ret < 0)
return ret;
ohci->regs = hcd->regs;
ret = ohci_run(ohci);
if (ret < 0) {
dev_err(hcd->self.controller, "can't start\n");
ohci_stop(hcd);
return ret;
}
create_debug_files(ohci);
#ifdef DEBUG
ohci_dump(ohci, 1);
#endif
return 0;
}
static const struct hc_driver ohci_spear_hc_driver = {
.description = hcd_name,
.product_desc = "SPEAr OHCI",
.hcd_priv_size = sizeof(struct spear_ohci),
/* generic hardware linkage */
.irq = ohci_irq,
.flags = HCD_USB11 | HCD_MEMORY,
/* basic lifecycle operations */
.start = ohci_spear_start,
.stop = ohci_stop,
.shutdown = ohci_shutdown,
#ifdef CONFIG_PM
.bus_suspend = ohci_bus_suspend,
.bus_resume = ohci_bus_resume,
#endif
/* managing i/o requests and associated device resources */
.urb_enqueue = ohci_urb_enqueue,
.urb_dequeue = ohci_urb_dequeue,
.endpoint_disable = ohci_endpoint_disable,
/* scheduling support */
.get_frame_number = ohci_get_frame,
/* root hub support */
.hub_status_data = ohci_hub_status_data,
.hub_control = ohci_hub_control,
.start_port_reset = ohci_start_port_reset,
};
static u64 spear_ohci_dma_mask = DMA_BIT_MASK(32);
static int spear_ohci_hcd_drv_probe(struct platform_device *pdev)
{
const struct hc_driver *driver = &ohci_spear_hc_driver;
struct usb_hcd *hcd = NULL;
struct clk *usbh_clk;
struct spear_ohci *ohci_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.
*/
if (!pdev->dev.dma_mask)
pdev->dev.dma_mask = &spear_ohci_dma_mask;
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);
if (!res) {
retval = -ENODEV;
goto err_put_hcd;
}
hcd->rsrc_start = pdev->resource[0].start;
hcd->rsrc_len = resource_size(res);
if (!devm_request_mem_region(&pdev->dev, hcd->rsrc_start, hcd->rsrc_len,
hcd_name)) {
dev_dbg(&pdev->dev, "request_mem_region failed\n");
retval = -EBUSY;
goto err_put_hcd;
}
hcd->regs = devm_ioremap(&pdev->dev, hcd->rsrc_start, hcd->rsrc_len);
if (!hcd->regs) {
dev_dbg(&pdev->dev, "ioremap failed\n");
retval = -ENOMEM;
goto err_put_hcd;
}
ohci_p = (struct spear_ohci *)hcd_to_ohci(hcd);
ohci_p->clk = usbh_clk;
spear_start_ohci(ohci_p);
ohci_hcd_init(hcd_to_ohci(hcd));
retval = usb_add_hcd(hcd, platform_get_irq(pdev, 0), 0);
if (retval == 0)
return retval;
spear_stop_ohci(ohci_p);
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 *ohci_p = to_spear_ohci(hcd);
usb_remove_hcd(hcd);
if (ohci_p->clk)
spear_stop_ohci(ohci_p);
usb_put_hcd(hcd);
platform_set_drvdata(pdev, NULL);
return 0;
}
#if defined(CONFIG_PM)
static int spear_ohci_hcd_drv_suspend(struct platform_device *dev,
pm_message_t message)
{
struct usb_hcd *hcd = platform_get_drvdata(dev);
struct ohci_hcd *ohci = hcd_to_ohci(hcd);
struct spear_ohci *ohci_p = to_spear_ohci(hcd);
if (time_before(jiffies, ohci->next_statechange))
msleep(5);
ohci->next_statechange = jiffies;
spear_stop_ohci(ohci_p);
return 0;
}
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 *ohci_p = to_spear_ohci(hcd);
if (time_before(jiffies, ohci->next_statechange))
msleep(5);
ohci->next_statechange = jiffies;
spear_start_ohci(ohci_p);
ohci_resume(hcd, false);
return 0;
}
#endif
static 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 = {
.owner = THIS_MODULE,
.name = "spear-ohci",
.of_match_table = of_match_ptr(spear_ohci_id_table),
},
};
MODULE_ALIAS("platform:spear-ohci");
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