/*
* 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
* (C) Copyright 2008 Magnus Damm
*
* SM501 Bus Glue - based on ohci-omap.c
*
* This file is licenced under the GPL.
*/
#include <linux/interrupt.h>
#include <linux/jiffies.h>
#include <linux/platform_device.h>
#include <linux/dma-mapping.h>
#include <linux/sm501.h>
#include <linux/sm501-regs.h>
static int ohci_sm501_init(struct usb_hcd *hcd)
{
return ohci_init(hcd_to_ohci(hcd));
}
static int ohci_sm501_start(struct usb_hcd *hcd)
{
struct device *dev = hcd->self.controller;
int ret;
ret = ohci_run(hcd_to_ohci(hcd));
if (ret < 0) {
dev_err(dev, "can't start %s", hcd->self.bus_name);
ohci_stop(hcd);
}
return ret;
}
/*-------------------------------------------------------------------------*/
static const struct hc_driver ohci_sm501_hc_driver = {
.description = hcd_name,
.product_desc = "SM501 OHCI",
.hcd_priv_size = sizeof(struct ohci_hcd),
/*
* generic hardware linkage
*/
.irq = ohci_irq,
.flags = HCD_USB11 | HCD_MEMORY | HCD_LOCAL_MEM,
/*
* basic lifecycle operations
*/
.reset = ohci_sm501_init,
.start = ohci_sm501_start,
.stop = ohci_stop,
.shutdown = ohci_shutdown,
/*
* 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,
#ifdef CONFIG_PM
.bus_suspend = ohci_bus_suspend,
.bus_resume = ohci_bus_resume,
#endif
.start_port_reset = ohci_start_port_reset,
};
/*-------------------------------------------------------------------------*/
static int ohci_hcd_sm501_drv_probe(struct platform_device *pdev)
{
const struct hc_driver *driver = &ohci_sm501_hc_driver;
struct device *dev = &pdev->dev;
struct resource *res, *mem;
int retval, irq;
struct usb_hcd *hcd = NULL;
irq = retval = platform_get_irq(pdev, 0);
if (retval < 0)
goto err0;
mem = platform_get_resource(pdev, IORESOURCE_MEM, 1);
if (mem == NULL) {
dev_err(dev, "no resource definition for memory\n");
retval = -ENOENT;
goto err0;
}
if (!request_mem_region(mem->start, mem->end - mem->start + 1,
pdev->name)) {
dev_err(dev, "request_mem_region failed\n");
retval = -EBUSY;
goto err0;
}
/* The sm501 chip is equipped with local memory that may be used
* by on-chip devices such as the video controller and the usb host.
* This driver uses dma_declare_coherent_memory() to make sure
* usb allocations with dma_alloc_coherent() allocate from
* this local memory. The dma_handle returned by dma_alloc_coherent()
* will be an offset starting from 0 for the first local memory byte.
*
* So as long as data is allocated using dma_alloc_coherent() all is
* fine. This is however not always the case - buffers may be allocated
* using kmalloc() - so the usb core needs to be told that it must copy
* data into our local memory if the buffers happen to be placed in
* regular memory. The HCD_LOCAL_MEM flag does just that.
*/
if (!dma_declare_coherent_memory(dev, mem->start,
mem->start - mem->parent->start,
(mem->end - mem->start) + 1,
DMA_MEMORY_MAP |
DMA_MEMORY_EXCLUSIVE)) {
dev_err(dev, "cannot declare coherent memory\n");
retval = -ENXIO;
goto err1;
}
/* allocate, reserve and remap resources for registers */
res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
if (res == NULL) {
dev_err(dev, "no resource definition for registers\n");
retval = -ENOENT;
goto err2;
}
hcd = usb_create_hcd(driver, &pdev->dev, dev_name(&pdev->dev));
if (!hcd) {
retval = -ENOMEM;
goto err2;
}
hcd->rsrc_start = res->start;
hcd->rsrc_len = res->end - res->start + 1;
if (!request_mem_region(hcd->rsrc_start, hcd->rsrc_len, pdev->name)) {
dev_err(dev, "request_mem_region failed\n");
retval = -EBUSY;
goto err3;
}
hcd->regs = ioremap(hcd->rsrc_start, hcd->rsrc_len);
if (hcd->regs == NULL) {
dev_err(dev, "cannot remap registers\n");
retval = -ENXIO;
goto err4;
}
ohci_hcd_init(hcd_to_ohci(hcd));
retval = usb_add_hcd(hcd, irq, IRQF_DISABLED | IRQF_SHARED);
if (retval)
goto err4;
/* enable power and unmask interrupts */
sm501_unit_power(dev->parent, SM501_GATE_USB_HOST, 1);
sm501_modify_reg(dev->parent, SM501_IRQ_MASK, 1 << 6, 0);
return 0;
err4:
release_mem_region(hcd->rsrc_start, hcd->rsrc_len);
err3:
usb_put_hcd(hcd);
err2:
dma_release_declared_memory(dev);
err1:
release_mem_region(mem->start, mem->end - mem->start + 1);
err0:
return retval;
}
static int ohci_hcd_sm501_drv_remove(struct platform_device *pdev)
{
struct usb_hcd *hcd = platform_get_drvdata(pdev);
struct resource *mem;
usb_remove_hcd(hcd);
release_mem_region(hcd->rsrc_start, hcd->rsrc_len);
usb_put_hcd(hcd);
dma_release_declared_memory(&pdev->dev);
mem = platform_get_resource(pdev, IORESOURCE_MEM, 1);
if (mem)
release_mem_region(mem->start, mem->end - mem->start + 1);
/* mask interrupts and disable power */
sm501_modify_reg(pdev->dev.parent, SM501_IRQ_MASK, 0, 1 << 6);
sm501_unit_power(pdev->dev.parent, SM501_GATE_USB_HOST, 0);
platform_set_drvdata(pdev, NULL);
return 0;
}
/*-------------------------------------------------------------------------*/
#ifdef CONFIG_PM
static int ohci_sm501_suspend(struct platform_device *pdev, pm_message_t msg)
{
struct device *dev = &pdev->dev;
struct ohci_hcd *ohci = hcd_to_ohci(platform_get_drvdata(pdev));
if (time_before(jiffies, ohci->next_statechange))
msleep(5);
ohci->next_statechange = jiffies;
sm501_unit_power(dev->parent, SM501_GATE_USB_HOST, 0);
ohci_to_hcd(ohci)->state = HC_STATE_SUSPENDED;
return 0;
}
static int ohci_sm501_resume(struct platform_device *pdev)
{
struct device *dev = &pdev->dev;
struct usb_hcd *hcd = platform_get_drvdata(pdev);
struct ohci_hcd *ohci = hcd_to_ohci(hcd);
if (time_before(jiffies, ohci->next_statechange))
msleep(5);
ohci->next_statechange = jiffies;
sm501_unit_power(dev->parent, SM501_GATE_USB_HOST, 1);
ohci_finish_controller_resume(hcd);
return 0;
}
#else
#define ohci_sm501_suspend NULL
#define ohci_sm501_resume NULL
#endif
/*-------------------------------------------------------------------------*/
/*
* Driver definition to register with the SM501 bus
*/
static struct platform_driver ohci_hcd_sm501_driver = {
.probe = ohci_hcd_sm501_drv_probe,
.remove = ohci_hcd_sm501_drv_remove,
.shutdown = usb_hcd_platform_shutdown,
.suspend = ohci_sm501_suspend,
.resume = ohci_sm501_resume,
.driver = {
.owner = THIS_MODULE,
.name = "sm501-usb",
},
};
MODULE_ALIAS("platform:sm501-usb");
