288 lines
6.3 KiB
C
288 lines
6.3 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 platform_device *op, const struct of_device_id *match)
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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 = 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 "%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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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)
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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 int 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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return 0;
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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 of_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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