/* $NetBSD: ehci_plb.c,v 1.2 2026/06/19 18:55:23 rkujawa Exp $ */ /* * Copyright (c) 2026 The NetBSD Foundation, Inc. * All rights reserved. * * This code is derived from software contributed to The NetBSD Foundation * by Radoslaw Kujawa. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. */ /* * EHCI behind the PLB-AHB bridge. */ #include __KERNEL_RCSID(0, "$NetBSD: ehci_plb.c,v 1.2 2026/06/19 18:55:23 rkujawa Exp $"); #include "opt_ppc4xx.h" #include #include #include #include #include #include #ifdef PPC4XX_L2CACHE #include #endif #include #include #include #include #include #include #define EHCI_PLB_SIZE 0x400 #include "locators.h" static int ehci_plb_match(device_t, cfdata_t, void *); static void ehci_plb_attach(device_t, device_t, void *); static void ehci_plb_deferred(device_t); CFATTACH_DECL_NEW(ehci_plb, sizeof(struct ehci_softc), ehci_plb_match, ehci_plb_attach, NULL, NULL); static struct powerpc_bus_space ehci_plb_tag = { _BUS_SPACE_LITTLE_ENDIAN | _BUS_SPACE_MEM_TYPE, 0x00000000, }; static char ehci_ex_storage[EXTENT_FIXED_STORAGE_SIZE(8)] __attribute__((aligned(8))); /* * PLB4xAHB AHB arbiter */ #define AHBARB_BASE 0xbffd2000 #define AHBARB_SIZE 0x100 #define AHBARB_PL5 0x10 /* AHB master #5 priority = EHCI */ #define AHBARB_VERSION 0x90 #define AHBARB_VERSION_MAGIC 0x3230362a #define AHBARB_PRIO_MAX 15 /* 0=disabled .. 15=highest */ static struct powerpc_bus_space ehci_plb_arb_tag = { _BUS_SPACE_LITTLE_ENDIAN | _BUS_SPACE_MEM_TYPE, 0x00000000, }; static char ehci_arb_ex_storage[EXTENT_FIXED_STORAGE_SIZE(8)] __attribute__((aligned(8))); static int ehci_plb_match(device_t parent, cfdata_t match, void *aux) { struct plb_attach_args *paa = aux; if (strcmp(paa->plb_name, match->cf_name) != 0) return 0; if (match->cf_loc[PLBCF_ADDR] == PLBCF_ADDR_DEFAULT) panic("ehci_plb_match: wildcard addr not allowed"); if (match->cf_loc[PLBCF_IRQ] == PLBCF_IRQ_DEFAULT) panic("ehci_plb_match: wildcard IRQ not allowed"); paa->plb_addr = match->cf_loc[PLBCF_ADDR]; paa->plb_irq = match->cf_loc[PLBCF_IRQ]; return 1; } /* * Raise the EHCI host controller's AHB arbitration priority to the maximum. */ static void ehci_plb_set_arb_priority(device_t self) { bus_space_handle_t ioh; ehci_plb_arb_tag.pbs_base = AHBARB_BASE; ehci_plb_arb_tag.pbs_limit = AHBARB_BASE + AHBARB_SIZE; if (bus_space_init(&ehci_plb_arb_tag, "ehciarb", ehci_arb_ex_storage, sizeof(ehci_arb_ex_storage)) || bus_space_map(&ehci_plb_arb_tag, AHBARB_BASE, AHBARB_SIZE, 0, &ioh)) { aprint_error_dev(self, "can't map AHB arbiter\n"); return; } if (bus_space_read_4(&ehci_plb_arb_tag, ioh, AHBARB_VERSION) == AHBARB_VERSION_MAGIC) bus_space_write_4(&ehci_plb_arb_tag, ioh, AHBARB_PL5, AHBARB_PRIO_MAX); else aprint_error_dev(self, "AHB arbiter version mismatch; EHCI priority unchanged\n"); bus_space_unmap(&ehci_plb_arb_tag, ioh, AHBARB_SIZE); } static void ehci_plb_attach(device_t parent, device_t self, void *aux) { struct ehci_softc *sc = device_private(self); struct plb_attach_args *paa = aux; sc->sc_dev = self; sc->sc_bus.ub_hcpriv = sc; #ifdef PPC4XX_L2CACHE /* USB DMA needs software L2 invalidation (hardware snoop misses it). */ sc->sc_bus.ub_dmatag = ibm4xx_460ex_l2_dmatag(); #else sc->sc_bus.ub_dmatag = paa->plb_dmat; #endif sc->sc_bus.ub_revision = USBREV_2_0; ehci_plb_tag.pbs_base = paa->plb_addr; ehci_plb_tag.pbs_limit = paa->plb_addr + EHCI_PLB_SIZE; sc->iot = &ehci_plb_tag; if (bus_space_init(&ehci_plb_tag, "ehciplb", ehci_ex_storage, sizeof(ehci_ex_storage)) || bus_space_map(sc->iot, paa->plb_addr, EHCI_PLB_SIZE, 0, &sc->ioh)) { aprint_error(": can't map registers\n"); return; } sc->sc_size = EHCI_PLB_SIZE; aprint_normal(": EHCI USB controller\n"); sc->sc_offs = bus_space_read_1(sc->iot, sc->ioh, EHCI_CAPLENGTH); /* Give the EHCI AHB master top arbitration priority (ERR4003 CHIP_16). */ ehci_plb_set_arb_priority(self); /* Disable interrupts, so we don't get any spurious ones. */ bus_space_write_4(sc->iot, sc->ioh, sc->sc_offs + EHCI_USBINTR, 0); intr_establish_xname(paa->plb_irq, IST_LEVEL, IPL_USB, ehci_intr, sc, device_xname(self)); /* Wait until the companion OHCI has attached. */ config_defer(self, ehci_plb_deferred); } static void ehci_plb_deferred(device_t self) { struct ehci_softc *sc = device_private(self); device_t comp; int error; comp = device_find_by_xname("ohci0"); if (comp != NULL) { sc->sc_ncomp = 1; sc->sc_comps[0] = comp; } error = ehci_init(sc); if (error) { aprint_error_dev(self, "init failed, error=%d\n", error); return; } sc->sc_child = config_found(self, &sc->sc_bus, usbctlprint, CFARGS_NONE); }