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240 lines
5.2 KiB
240 lines
5.2 KiB
// SPDX-License-Identifier: GPL-1.0+ |
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/* |
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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 <[email protected]> |
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* |
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* Based on "ehci-ppc-soc.c" by Stefan Roese <[email protected]> |
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* and "ohci-ppc-of.c" by Sylvain Munaut <[email protected]> |
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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/err.h> |
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#include <linux/signal.h> |
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#include <linux/of.h> |
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#include <linux/of_address.h> |
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#include <linux/of_irq.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_DMA | 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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#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 |
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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 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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irq = irq_of_parse_and_map(dn, 0); |
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if (irq == NO_IRQ) { |
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dev_err(&op->dev, "%s: irq_of_parse_and_map failed\n", |
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__FILE__); |
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rv = -EBUSY; |
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goto err_irq; |
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} |
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hcd->regs = devm_ioremap_resource(&op->dev, &res); |
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if (IS_ERR(hcd->regs)) { |
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rv = PTR_ERR(hcd->regs); |
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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 = |
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devm_ioremap(&op->dev, |
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res.start + OHCI_HCCTRL_OFFSET, |
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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_ioremap; |
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device_wakeup_enable(hcd->self.controller); |
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return 0; |
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err_ioremap: |
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irq_dispose_mapping(irq); |
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err_irq: |
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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 = platform_get_drvdata(op); |
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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_dbg(&op->dev, "stopping PPC-OF USB Controller\n"); |
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usb_remove_hcd(hcd); |
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irq_dispose_mapping(hcd->irq); |
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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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} |
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usb_put_hcd(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 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 = usb_hcd_platform_shutdown, |
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.driver = { |
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.name = "ppc-of-ehci", |
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.of_match_table = ehci_hcd_ppc_of_match, |
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}, |
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};
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