1a49e2ac96
This patch (as1564c) converts the EHCI platform drivers to use the central ehci_setup() routine for generic controller initialization rather than each having its own idiosyncratic approach. The major point of difficulty lies in ehci-pci's many vendor- and device-specific workarounds. Some of them have to be applied before calling ehci_setup() and some after, which necessitates a fair amount of code motion. The other platform drivers require much smaller changes. One point not addressed by the patch is whether ports should be powered on or off following initialization. The different drivers appear to handle this pretty much at random. In fact it shouldn't matter, because the hub driver turns on power to all ports when it binds to the root hub. Straightening that out will be left for another day. Signed-off-by: Alan Stern <stern@rowland.harvard.edu> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
262 lines
5.7 KiB
C
262 lines
5.7 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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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_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 ehci_hcd_ppc_of_probe(struct platform_device *op)
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{
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struct device_node *dn = op->dev.of_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 = resource_size(&res);
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if (!request_mem_region(hcd->rsrc_start, hcd->rsrc_len, hcd_name)) {
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printk(KERN_ERR "%s: request_mem_region failed\n", __FILE__);
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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 "%s: irq_of_parse_and_map failed\n", __FILE__);
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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 "%s: ioremap failed\n", __FILE__);
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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("%s: no ohci offset in fdt\n", __FILE__);
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if (!ehci->ohci_hcctrl_reg) {
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pr_debug("%s: ioremap for ohci hcctrl failed\n", __FILE__);
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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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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)
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goto err_ehci;
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return 0;
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err_ehci:
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if (ehci->has_amcc_usb23)
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iounmap(ehci->ohci_hcctrl_reg);
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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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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 platform_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("%s: no ohci offset in fdt\n", __FILE__);
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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 void ehci_hcd_ppc_of_shutdown(struct platform_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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}
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static const 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 platform_driver ehci_hcd_ppc_of_driver = {
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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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.of_match_table = ehci_hcd_ppc_of_match,
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},
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};
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