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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_EHCI_HCD_NAME "octeon-ehci"
/* Common clock init code. */
void octeon2_usb_clocks_start(void);
void octeon2_usb_clocks_stop(void);
static void ehci_octeon_start(void)
{
union cvmx_uctlx_ehci_ctl ehci_ctl;
octeon2_usb_clocks_start();
ehci_ctl.u64 = cvmx_read_csr(CVMX_UCTLX_EHCI_CTL(0));
/* Use 64-bit addressing. */
ehci_ctl.s.ehci_64b_addr_en = 1;
ehci_ctl.s.l2c_addr_msb = 0;
ehci_ctl.s.l2c_buff_emod = 1; /* Byte swapped. */
ehci_ctl.s.l2c_desc_emod = 1; /* Byte swapped. */
cvmx_write_csr(CVMX_UCTLX_EHCI_CTL(0), ehci_ctl.u64);
}
static void ehci_octeon_stop(void)
{
octeon2_usb_clocks_stop();
}
static const struct hc_driver ehci_octeon_hc_driver = {
.description = hcd_name,
.product_desc = "Octeon EHCI",
.hcd_priv_size = sizeof(struct ehci_hcd),
/*
* generic hardware linkage
*/
.irq = ehci_irq,
.flags = HCD_MEMORY | HCD_USB2,
/*
* basic lifecycle operations
*/
.reset = ehci_init,
.start = ehci_run,
.stop = ehci_stop,
.shutdown = ehci_shutdown,
/*
* managing i/o requests and associated device resources
*/
.urb_enqueue = ehci_urb_enqueue,
.urb_dequeue = ehci_urb_dequeue,
.endpoint_disable = ehci_endpoint_disable,
.endpoint_reset = ehci_endpoint_reset,
/*
* scheduling support
*/
.get_frame_number = ehci_get_frame,
/*
* root hub support
*/
.hub_status_data = ehci_hub_status_data,
.hub_control = ehci_hub_control,
.bus_suspend = ehci_bus_suspend,
.bus_resume = ehci_bus_resume,
.relinquish_port = ehci_relinquish_port,
.port_handed_over = ehci_port_handed_over,
.clear_tt_buffer_complete = ehci_clear_tt_buffer_complete,
};
static u64 ehci_octeon_dma_mask = DMA_BIT_MASK(64);
static int ehci_octeon_drv_probe(struct platform_device *pdev)
{
struct usb_hcd *hcd;
struct ehci_hcd *ehci;
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;
}
/*
* We can DMA from anywhere. But the descriptors must be in
* the lower 4GB.
*/
pdev->dev.coherent_dma_mask = DMA_BIT_MASK(32);
pdev->dev.dma_mask = &ehci_octeon_dma_mask;
hcd = usb_create_hcd(&ehci_octeon_hc_driver, &pdev->dev, "octeon");
if (!hcd)
return -ENOMEM;
hcd->rsrc_start = res_mem->start;
hcd->rsrc_len = res_mem->end - res_mem->start + 1;
if (!request_mem_region(hcd->rsrc_start, hcd->rsrc_len,
OCTEON_EHCI_HCD_NAME)) {
dev_err(&pdev->dev, "request_mem_region failed\n");
ret = -EBUSY;
goto err1;
}
hcd->regs = ioremap(hcd->rsrc_start, hcd->rsrc_len);
if (!hcd->regs) {
dev_err(&pdev->dev, "ioremap failed\n");
ret = -ENOMEM;
goto err2;
}
ehci_octeon_start();
ehci = hcd_to_ehci(hcd);
/* Octeon EHCI matches CPU endianness. */
#ifdef __BIG_ENDIAN
ehci->big_endian_mmio = 1;
#endif
ehci->caps = hcd->regs;
ehci->regs = hcd->regs +
HC_LENGTH(ehci, ehci_readl(ehci, &ehci->caps->hc_capbase));
/* cache this readonly data; minimize chip reads */
ehci->hcs_params = ehci_readl(ehci, &ehci->caps->hcs_params);
ret = usb_add_hcd(hcd, irq, IRQF_DISABLED | IRQF_SHARED);
if (ret) {
dev_dbg(&pdev->dev, "failed to add hcd with err %d\n", ret);
goto err3;
}
platform_set_drvdata(pdev, hcd);
/* root ports should always stay powered */
ehci_port_power(ehci, 1);
return 0;
err3:
ehci_octeon_stop();
iounmap(hcd->regs);
err2:
release_mem_region(hcd->rsrc_start, hcd->rsrc_len);
err1:
usb_put_hcd(hcd);
return ret;
}
static int ehci_octeon_drv_remove(struct platform_device *pdev)
{
struct usb_hcd *hcd = platform_get_drvdata(pdev);
usb_remove_hcd(hcd);
ehci_octeon_stop();
iounmap(hcd->regs);
release_mem_region(hcd->rsrc_start, hcd->rsrc_len);
usb_put_hcd(hcd);
platform_set_drvdata(pdev, NULL);
return 0;
}
static struct platform_driver ehci_octeon_driver = {
.probe = ehci_octeon_drv_probe,
.remove = ehci_octeon_drv_remove,
.shutdown = usb_hcd_platform_shutdown,
.driver = {
.name = OCTEON_EHCI_HCD_NAME,
.owner = THIS_MODULE,
}
};
MODULE_ALIAS("platform:" OCTEON_EHCI_HCD_NAME);
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