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/*
* EHCI HCD glue for Cavium Octeon II SOCs.
*
* Loosely based on ehci-au1xxx.c
*
* This file is subject to the terms and conditions of the GNU General Public
* License. See the file "COPYING" in the main directory of this archive
* for more details.
*
* Copyright (C) 2010 Cavium Networks
*
*/
#include <linux/platform_device.h>
#include <asm/octeon/octeon.h>
#include <asm/octeon/cvmx-uctlx-defs.h>
#define OCTEON_OHCI_HCD_NAME "octeon-ohci"
/* Common clock init code. */
void octeon2_usb_clocks_start(void);
void octeon2_usb_clocks_stop(void);
static void ohci_octeon_hw_start(void)
{
union cvmx_uctlx_ohci_ctl ohci_ctl;
octeon2_usb_clocks_start();
ohci_ctl.u64 = cvmx_read_csr(CVMX_UCTLX_OHCI_CTL(0));
ohci_ctl.s.l2c_addr_msb = 0;
ohci_ctl.s.l2c_buff_emod = 1; /* Byte swapped. */
ohci_ctl.s.l2c_desc_emod = 1; /* Byte swapped. */
cvmx_write_csr(CVMX_UCTLX_OHCI_CTL(0), ohci_ctl.u64);
}
static void ohci_octeon_hw_stop(void)
{
/* Undo ohci_octeon_start() */
octeon2_usb_clocks_stop();
}
static int ohci_octeon_start(struct usb_hcd *hcd)
{
struct ohci_hcd *ohci = hcd_to_ohci(hcd);
int ret;
ret = ohci_init(ohci);
if (ret < 0)
return ret;
ret = ohci_run(ohci);
if (ret < 0) {
ohci_err(ohci, "can't start %s", hcd->self.bus_name);
ohci_stop(hcd);
return ret;
}
return 0;
}
static const struct hc_driver ohci_octeon_hc_driver = {
.description = hcd_name,
.product_desc = "Octeon OHCI",
.hcd_priv_size = sizeof(struct ohci_hcd),
/*
* generic hardware linkage
*/
.irq = ohci_irq,
.flags = HCD_USB11 | HCD_MEMORY,
/*
* basic lifecycle operations
*/
.start = ohci_octeon_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,
.start_port_reset = ohci_start_port_reset,
};
static int ohci_octeon_drv_probe(struct platform_device *pdev)
{
struct usb_hcd *hcd;
struct ohci_hcd *ohci;
void *reg_base;
struct resource *res_mem;
int irq;
int ret;
if (usb_disabled())
return -ENODEV;
irq = platform_get_irq(pdev, 0);
if (irq < 0) {
dev_err(&pdev->dev, "No irq assigned\n");
return -ENODEV;
}
res_mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
if (res_mem == NULL) {
dev_err(&pdev->dev, "No register space assigned\n");
return -ENODEV;
}
/* Ohci is a 32-bit device. */
pdev->dev.dma_mask = &pdev->dev.coherent_dma_mask;
ret = dma_set_coherent_mask(&pdev->dev, DMA_BIT_MASK(32));
if (ret)
return ret;
hcd = usb_create_hcd(&ohci_octeon_hc_driver, &pdev->dev, "octeon");
if (!hcd)
return -ENOMEM;
hcd->rsrc_start = res_mem->start;
hcd->rsrc_len = resource_size(res_mem);
if (!request_mem_region(hcd->rsrc_start, hcd->rsrc_len,
OCTEON_OHCI_HCD_NAME)) {
dev_err(&pdev->dev, "request_mem_region failed\n");
ret = -EBUSY;
goto err1;
}
reg_base = ioremap(hcd->rsrc_start, hcd->rsrc_len);
if (!reg_base) {
dev_err(&pdev->dev, "ioremap failed\n");
ret = -ENOMEM;
goto err2;
}
ohci_octeon_hw_start();
hcd->regs = reg_base;
ohci = hcd_to_ohci(hcd);
/* Octeon OHCI matches CPU endianness. */
#ifdef __BIG_ENDIAN
ohci->flags |= OHCI_QUIRK_BE_MMIO;
#endif
ohci_hcd_init(ohci);
ret = usb_add_hcd(hcd, irq, IRQF_SHARED);
if (ret) {
dev_dbg(&pdev->dev, "failed to add hcd with err %d\n", ret);
goto err3;
}
platform_set_drvdata(pdev, hcd);
return 0;
err3:
ohci_octeon_hw_stop();
iounmap(hcd->regs);
err2:
release_mem_region(hcd->rsrc_start, hcd->rsrc_len);
err1:
usb_put_hcd(hcd);
return ret;
}
static int ohci_octeon_drv_remove(struct platform_device *pdev)
{
struct usb_hcd *hcd = platform_get_drvdata(pdev);
usb_remove_hcd(hcd);
ohci_octeon_hw_stop();
iounmap(hcd->regs);
release_mem_region(hcd->rsrc_start, hcd->rsrc_len);
usb_put_hcd(hcd);
return 0;
}
static struct platform_driver ohci_octeon_driver = {
.probe = ohci_octeon_drv_probe,
.remove = ohci_octeon_drv_remove,
.shutdown = usb_hcd_platform_shutdown,
.driver = {
.name = OCTEON_OHCI_HCD_NAME,
.owner = THIS_MODULE,
}
};
MODULE_ALIAS("platform:" OCTEON_OHCI_HCD_NAME);
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