188 lines
4 KiB
C
188 lines
4 KiB
C
/*
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* EHCI HCD glue for Cavium Octeon II SOCs.
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*
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* Loosely based on ehci-au1xxx.c
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*
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* This file is subject to the terms and conditions of the GNU General Public
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* License. See the file "COPYING" in the main directory of this archive
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* for more details.
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*
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* Copyright (C) 2010 Cavium Networks
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*
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*/
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#include <linux/platform_device.h>
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#include <asm/octeon/octeon.h>
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#include <asm/octeon/cvmx-uctlx-defs.h>
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#define OCTEON_EHCI_HCD_NAME "octeon-ehci"
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/* Common clock init code. */
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void octeon2_usb_clocks_start(void);
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void octeon2_usb_clocks_stop(void);
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static void ehci_octeon_start(void)
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{
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union cvmx_uctlx_ehci_ctl ehci_ctl;
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octeon2_usb_clocks_start();
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ehci_ctl.u64 = cvmx_read_csr(CVMX_UCTLX_EHCI_CTL(0));
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/* Use 64-bit addressing. */
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ehci_ctl.s.ehci_64b_addr_en = 1;
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ehci_ctl.s.l2c_addr_msb = 0;
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ehci_ctl.s.l2c_buff_emod = 1; /* Byte swapped. */
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ehci_ctl.s.l2c_desc_emod = 1; /* Byte swapped. */
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cvmx_write_csr(CVMX_UCTLX_EHCI_CTL(0), ehci_ctl.u64);
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}
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static void ehci_octeon_stop(void)
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{
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octeon2_usb_clocks_stop();
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}
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static const struct hc_driver ehci_octeon_hc_driver = {
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.description = hcd_name,
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.product_desc = "Octeon EHCI",
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.hcd_priv_size = sizeof(struct ehci_hcd),
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/*
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* generic hardware linkage
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*/
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.irq = ehci_irq,
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.flags = HCD_MEMORY | HCD_USB2 | HCD_BH,
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/*
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* basic lifecycle operations
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*/
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.reset = ehci_setup,
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.start = ehci_run,
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.stop = ehci_stop,
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.shutdown = ehci_shutdown,
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/*
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* managing i/o requests and associated device resources
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*/
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.urb_enqueue = ehci_urb_enqueue,
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.urb_dequeue = ehci_urb_dequeue,
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.endpoint_disable = ehci_endpoint_disable,
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.endpoint_reset = ehci_endpoint_reset,
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/*
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* scheduling support
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*/
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.get_frame_number = ehci_get_frame,
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/*
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* root hub support
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*/
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.hub_status_data = ehci_hub_status_data,
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.hub_control = ehci_hub_control,
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.bus_suspend = ehci_bus_suspend,
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.bus_resume = ehci_bus_resume,
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.relinquish_port = ehci_relinquish_port,
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.port_handed_over = ehci_port_handed_over,
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.clear_tt_buffer_complete = ehci_clear_tt_buffer_complete,
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};
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static u64 ehci_octeon_dma_mask = DMA_BIT_MASK(64);
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static int ehci_octeon_drv_probe(struct platform_device *pdev)
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{
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struct usb_hcd *hcd;
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struct ehci_hcd *ehci;
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struct resource *res_mem;
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int irq;
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int ret;
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if (usb_disabled())
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return -ENODEV;
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irq = platform_get_irq(pdev, 0);
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if (irq < 0) {
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dev_err(&pdev->dev, "No irq assigned\n");
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return -ENODEV;
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}
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res_mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
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if (res_mem == NULL) {
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dev_err(&pdev->dev, "No register space assigned\n");
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return -ENODEV;
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}
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/*
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* We can DMA from anywhere. But the descriptors must be in
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* the lower 4GB.
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*/
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pdev->dev.dma_mask = &ehci_octeon_dma_mask;
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ret = dma_set_coherent_mask(&pdev->dev, DMA_BIT_MASK(32));
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if (ret)
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return ret;
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hcd = usb_create_hcd(&ehci_octeon_hc_driver, &pdev->dev, "octeon");
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if (!hcd)
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return -ENOMEM;
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hcd->rsrc_start = res_mem->start;
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hcd->rsrc_len = resource_size(res_mem);
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hcd->regs = devm_ioremap_resource(&pdev->dev, res_mem);
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if (IS_ERR(hcd->regs)) {
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ret = PTR_ERR(hcd->regs);
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goto err1;
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}
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ehci_octeon_start();
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ehci = hcd_to_ehci(hcd);
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/* Octeon EHCI matches CPU endianness. */
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#ifdef __BIG_ENDIAN
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ehci->big_endian_mmio = 1;
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#endif
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ehci->caps = hcd->regs;
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ret = usb_add_hcd(hcd, irq, IRQF_SHARED);
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if (ret) {
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dev_dbg(&pdev->dev, "failed to add hcd with err %d\n", ret);
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goto err2;
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}
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device_wakeup_enable(hcd->self.controller);
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platform_set_drvdata(pdev, hcd);
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return 0;
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err2:
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ehci_octeon_stop();
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err1:
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usb_put_hcd(hcd);
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return ret;
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}
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static int ehci_octeon_drv_remove(struct platform_device *pdev)
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{
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struct usb_hcd *hcd = platform_get_drvdata(pdev);
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usb_remove_hcd(hcd);
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ehci_octeon_stop();
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usb_put_hcd(hcd);
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return 0;
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}
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static struct platform_driver ehci_octeon_driver = {
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.probe = ehci_octeon_drv_probe,
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.remove = ehci_octeon_drv_remove,
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.shutdown = usb_hcd_platform_shutdown,
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.driver = {
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.name = OCTEON_EHCI_HCD_NAME,
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.owner = THIS_MODULE,
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}
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};
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MODULE_ALIAS("platform:" OCTEON_EHCI_HCD_NAME);
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