914b701280
This patch (as1256) changes ehci-hcd and all the other drivers in the EHCI family to make use of the new clear_tt_buffer callbacks. When a Clear-TT-Buffer request is in progress for a QH, the QH is not allowed to be linked into the async schedule until the request is finished. At that time, if there are any URBs queued for the QH, it is linked into the async schedule. Signed-off-by: Alan Stern <stern@rowland.harvard.edu> Cc: stable <stable@kernel.org> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
286 lines
6.2 KiB
C
286 lines
6.2 KiB
C
/*
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* EHCI HCD (Host Controller Driver) for USB.
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*
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* Bus Glue for PPC On-Chip EHCI driver on the of_platform bus
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* Tested on AMCC PPC 440EPx
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*
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* Valentine Barshak <vbarshak@ru.mvista.com>
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*
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* Based on "ehci-ppc-soc.c" by Stefan Roese <sr@denx.de>
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* and "ohci-ppc-of.c" by Sylvain Munaut <tnt@246tNt.com>
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*
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* This file is licenced under the GPL.
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*/
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#include <linux/signal.h>
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#include <linux/of.h>
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#include <linux/of_platform.h>
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/* called during probe() after chip reset completes */
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static int ehci_ppc_of_setup(struct usb_hcd *hcd)
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{
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struct ehci_hcd *ehci = hcd_to_ehci(hcd);
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int retval;
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retval = ehci_halt(ehci);
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if (retval)
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return retval;
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retval = ehci_init(hcd);
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if (retval)
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return retval;
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ehci->sbrn = 0x20;
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return ehci_reset(ehci);
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}
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static const struct hc_driver ehci_ppc_of_hc_driver = {
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.description = hcd_name,
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.product_desc = "OF 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,
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/*
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* basic lifecycle operations
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*/
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.reset = ehci_ppc_of_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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#ifdef CONFIG_PM
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.bus_suspend = ehci_bus_suspend,
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.bus_resume = ehci_bus_resume,
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#endif
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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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/*
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* 440EPx Errata USBH_3
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* Fix: Enable Break Memory Transfer (BMT) in INSNREG3
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*/
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#define PPC440EPX_EHCI0_INSREG_BMT (0x1 << 0)
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static int __devinit
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ppc44x_enable_bmt(struct device_node *dn)
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{
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__iomem u32 *insreg_virt;
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insreg_virt = of_iomap(dn, 1);
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if (!insreg_virt)
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return -EINVAL;
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out_be32(insreg_virt + 3, PPC440EPX_EHCI0_INSREG_BMT);
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iounmap(insreg_virt);
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return 0;
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}
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static int __devinit
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ehci_hcd_ppc_of_probe(struct of_device *op, const struct of_device_id *match)
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{
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struct device_node *dn = op->node;
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struct usb_hcd *hcd;
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struct ehci_hcd *ehci = NULL;
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struct resource res;
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int irq;
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int rv;
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struct device_node *np;
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if (usb_disabled())
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return -ENODEV;
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dev_dbg(&op->dev, "initializing PPC-OF USB Controller\n");
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rv = of_address_to_resource(dn, 0, &res);
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if (rv)
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return rv;
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hcd = usb_create_hcd(&ehci_ppc_of_hc_driver, &op->dev, "PPC-OF USB");
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if (!hcd)
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return -ENOMEM;
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hcd->rsrc_start = res.start;
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hcd->rsrc_len = res.end - res.start + 1;
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if (!request_mem_region(hcd->rsrc_start, hcd->rsrc_len, hcd_name)) {
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printk(KERN_ERR __FILE__ ": request_mem_region failed\n");
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rv = -EBUSY;
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goto err_rmr;
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}
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irq = irq_of_parse_and_map(dn, 0);
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if (irq == NO_IRQ) {
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printk(KERN_ERR __FILE__ ": irq_of_parse_and_map failed\n");
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rv = -EBUSY;
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goto err_irq;
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}
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hcd->regs = ioremap(hcd->rsrc_start, hcd->rsrc_len);
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if (!hcd->regs) {
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printk(KERN_ERR __FILE__ ": ioremap failed\n");
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rv = -ENOMEM;
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goto err_ioremap;
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}
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ehci = hcd_to_ehci(hcd);
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np = of_find_compatible_node(NULL, NULL, "ibm,usb-ohci-440epx");
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if (np != NULL) {
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/* claim we really affected by usb23 erratum */
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if (!of_address_to_resource(np, 0, &res))
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ehci->ohci_hcctrl_reg = ioremap(res.start +
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OHCI_HCCTRL_OFFSET, OHCI_HCCTRL_LEN);
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else
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pr_debug(__FILE__ ": no ohci offset in fdt\n");
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if (!ehci->ohci_hcctrl_reg) {
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pr_debug(__FILE__ ": ioremap for ohci hcctrl failed\n");
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} else {
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ehci->has_amcc_usb23 = 1;
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}
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}
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if (of_get_property(dn, "big-endian", NULL)) {
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ehci->big_endian_mmio = 1;
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ehci->big_endian_desc = 1;
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}
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if (of_get_property(dn, "big-endian-regs", NULL))
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ehci->big_endian_mmio = 1;
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if (of_get_property(dn, "big-endian-desc", NULL))
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ehci->big_endian_desc = 1;
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ehci->caps = hcd->regs;
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ehci->regs = hcd->regs +
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HC_LENGTH(ehci_readl(ehci, &ehci->caps->hc_capbase));
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/* cache this readonly data; minimize chip reads */
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ehci->hcs_params = ehci_readl(ehci, &ehci->caps->hcs_params);
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if (of_device_is_compatible(dn, "ibm,usb-ehci-440epx")) {
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rv = ppc44x_enable_bmt(dn);
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ehci_dbg(ehci, "Break Memory Transfer (BMT) is %senabled!\n",
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rv ? "NOT ": "");
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}
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rv = usb_add_hcd(hcd, irq, 0);
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if (rv == 0)
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return 0;
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iounmap(hcd->regs);
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err_ioremap:
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irq_dispose_mapping(irq);
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err_irq:
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release_mem_region(hcd->rsrc_start, hcd->rsrc_len);
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if (ehci->has_amcc_usb23)
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iounmap(ehci->ohci_hcctrl_reg);
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err_rmr:
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usb_put_hcd(hcd);
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return rv;
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}
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static int ehci_hcd_ppc_of_remove(struct of_device *op)
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{
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struct usb_hcd *hcd = dev_get_drvdata(&op->dev);
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struct ehci_hcd *ehci = hcd_to_ehci(hcd);
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struct device_node *np;
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struct resource res;
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dev_set_drvdata(&op->dev, NULL);
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dev_dbg(&op->dev, "stopping PPC-OF USB Controller\n");
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usb_remove_hcd(hcd);
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iounmap(hcd->regs);
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irq_dispose_mapping(hcd->irq);
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release_mem_region(hcd->rsrc_start, hcd->rsrc_len);
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/* use request_mem_region to test if the ohci driver is loaded. if so
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* ensure the ohci core is operational.
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*/
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if (ehci->has_amcc_usb23) {
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np = of_find_compatible_node(NULL, NULL, "ibm,usb-ohci-440epx");
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if (np != NULL) {
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if (!of_address_to_resource(np, 0, &res))
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if (!request_mem_region(res.start,
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0x4, hcd_name))
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set_ohci_hcfs(ehci, 1);
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else
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release_mem_region(res.start, 0x4);
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else
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pr_debug(__FILE__ ": no ohci offset in fdt\n");
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of_node_put(np);
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}
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iounmap(ehci->ohci_hcctrl_reg);
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}
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usb_put_hcd(hcd);
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return 0;
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}
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static int ehci_hcd_ppc_of_shutdown(struct of_device *op)
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{
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struct usb_hcd *hcd = dev_get_drvdata(&op->dev);
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if (hcd->driver->shutdown)
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hcd->driver->shutdown(hcd);
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return 0;
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}
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static struct of_device_id ehci_hcd_ppc_of_match[] = {
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{
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.compatible = "usb-ehci",
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},
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{},
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};
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MODULE_DEVICE_TABLE(of, ehci_hcd_ppc_of_match);
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static struct of_platform_driver ehci_hcd_ppc_of_driver = {
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.name = "ppc-of-ehci",
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.match_table = ehci_hcd_ppc_of_match,
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.probe = ehci_hcd_ppc_of_probe,
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.remove = ehci_hcd_ppc_of_remove,
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.shutdown = ehci_hcd_ppc_of_shutdown,
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.driver = {
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.name = "ppc-of-ehci",
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.owner = THIS_MODULE,
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},
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};
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