ehci_plb.c revision 1.2
1 /* $NetBSD: ehci_plb.c,v 1.2 2026/06/19 18:55:23 rkujawa Exp $ */ 2 3 /* 4 * Copyright (c) 2026 The NetBSD Foundation, Inc. 5 * All rights reserved. 6 * 7 * This code is derived from software contributed to The NetBSD Foundation 8 * by Radoslaw Kujawa. 9 * 10 * Redistribution and use in source and binary forms, with or without 11 * modification, are permitted provided that the following conditions 12 * are met: 13 * 1. Redistributions of source code must retain the above copyright 14 * notice, this list of conditions and the following disclaimer. 15 * 2. Redistributions in binary form must reproduce the above copyright 16 * notice, this list of conditions and the following disclaimer in the 17 * documentation and/or other materials provided with the distribution. 18 * 19 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 20 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 21 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 22 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 23 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 24 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 25 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 26 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 27 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 28 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 29 */ 30 31 /* 32 * EHCI behind the PLB-AHB bridge. 33 */ 34 35 #include <sys/cdefs.h> 36 __KERNEL_RCSID(0, "$NetBSD: ehci_plb.c,v 1.2 2026/06/19 18:55:23 rkujawa Exp $"); 37 38 #include "opt_ppc4xx.h" 39 40 #include <sys/param.h> 41 #include <sys/bus.h> 42 #include <sys/device.h> 43 #include <sys/extent.h> 44 45 #include <powerpc/ibm4xx/cpu.h> 46 #include <powerpc/ibm4xx/dev/plbvar.h> 47 #ifdef PPC4XX_L2CACHE 48 #include <powerpc/ibm4xx/ibm4xx_460ex_l2.h> 49 #endif 50 51 #include <dev/usb/usb.h> 52 #include <dev/usb/usbdi.h> 53 #include <dev/usb/usbdivar.h> 54 #include <dev/usb/usb_mem.h> 55 #include <dev/usb/ehcireg.h> 56 #include <dev/usb/ehcivar.h> 57 58 #define EHCI_PLB_SIZE 0x400 59 60 #include "locators.h" 61 62 static int ehci_plb_match(device_t, cfdata_t, void *); 63 static void ehci_plb_attach(device_t, device_t, void *); 64 static void ehci_plb_deferred(device_t); 65 66 CFATTACH_DECL_NEW(ehci_plb, sizeof(struct ehci_softc), 67 ehci_plb_match, ehci_plb_attach, NULL, NULL); 68 69 static struct powerpc_bus_space ehci_plb_tag = { 70 _BUS_SPACE_LITTLE_ENDIAN | _BUS_SPACE_MEM_TYPE, 71 0x00000000, 72 }; 73 static char ehci_ex_storage[EXTENT_FIXED_STORAGE_SIZE(8)] 74 __attribute__((aligned(8))); 75 76 /* 77 * PLB4xAHB AHB arbiter 78 */ 79 #define AHBARB_BASE 0xbffd2000 80 #define AHBARB_SIZE 0x100 81 #define AHBARB_PL5 0x10 /* AHB master #5 priority = EHCI */ 82 #define AHBARB_VERSION 0x90 83 #define AHBARB_VERSION_MAGIC 0x3230362a 84 #define AHBARB_PRIO_MAX 15 /* 0=disabled .. 15=highest */ 85 86 static struct powerpc_bus_space ehci_plb_arb_tag = { 87 _BUS_SPACE_LITTLE_ENDIAN | _BUS_SPACE_MEM_TYPE, 88 0x00000000, 89 }; 90 static char ehci_arb_ex_storage[EXTENT_FIXED_STORAGE_SIZE(8)] 91 __attribute__((aligned(8))); 92 93 static int 94 ehci_plb_match(device_t parent, cfdata_t match, void *aux) 95 { 96 struct plb_attach_args *paa = aux; 97 98 if (strcmp(paa->plb_name, match->cf_name) != 0) 99 return 0; 100 101 if (match->cf_loc[PLBCF_ADDR] == PLBCF_ADDR_DEFAULT) 102 panic("ehci_plb_match: wildcard addr not allowed"); 103 if (match->cf_loc[PLBCF_IRQ] == PLBCF_IRQ_DEFAULT) 104 panic("ehci_plb_match: wildcard IRQ not allowed"); 105 106 paa->plb_addr = match->cf_loc[PLBCF_ADDR]; 107 paa->plb_irq = match->cf_loc[PLBCF_IRQ]; 108 return 1; 109 } 110 111 /* 112 * Raise the EHCI host controller's AHB arbitration priority to the maximum. 113 */ 114 static void 115 ehci_plb_set_arb_priority(device_t self) 116 { 117 bus_space_handle_t ioh; 118 119 ehci_plb_arb_tag.pbs_base = AHBARB_BASE; 120 ehci_plb_arb_tag.pbs_limit = AHBARB_BASE + AHBARB_SIZE; 121 if (bus_space_init(&ehci_plb_arb_tag, "ehciarb", ehci_arb_ex_storage, 122 sizeof(ehci_arb_ex_storage)) || 123 bus_space_map(&ehci_plb_arb_tag, AHBARB_BASE, AHBARB_SIZE, 0, &ioh)) { 124 aprint_error_dev(self, "can't map AHB arbiter\n"); 125 return; 126 } 127 128 if (bus_space_read_4(&ehci_plb_arb_tag, ioh, AHBARB_VERSION) == 129 AHBARB_VERSION_MAGIC) 130 bus_space_write_4(&ehci_plb_arb_tag, ioh, AHBARB_PL5, 131 AHBARB_PRIO_MAX); 132 else 133 aprint_error_dev(self, 134 "AHB arbiter version mismatch; EHCI priority unchanged\n"); 135 136 bus_space_unmap(&ehci_plb_arb_tag, ioh, AHBARB_SIZE); 137 } 138 139 static void 140 ehci_plb_attach(device_t parent, device_t self, void *aux) 141 { 142 struct ehci_softc *sc = device_private(self); 143 struct plb_attach_args *paa = aux; 144 145 sc->sc_dev = self; 146 sc->sc_bus.ub_hcpriv = sc; 147 #ifdef PPC4XX_L2CACHE 148 /* USB DMA needs software L2 invalidation (hardware snoop misses it). */ 149 sc->sc_bus.ub_dmatag = ibm4xx_460ex_l2_dmatag(); 150 #else 151 sc->sc_bus.ub_dmatag = paa->plb_dmat; 152 #endif 153 sc->sc_bus.ub_revision = USBREV_2_0; 154 155 ehci_plb_tag.pbs_base = paa->plb_addr; 156 ehci_plb_tag.pbs_limit = paa->plb_addr + EHCI_PLB_SIZE; 157 sc->iot = &ehci_plb_tag; 158 159 if (bus_space_init(&ehci_plb_tag, "ehciplb", ehci_ex_storage, 160 sizeof(ehci_ex_storage)) || 161 bus_space_map(sc->iot, paa->plb_addr, EHCI_PLB_SIZE, 0, 162 &sc->ioh)) { 163 aprint_error(": can't map registers\n"); 164 return; 165 } 166 sc->sc_size = EHCI_PLB_SIZE; 167 168 aprint_normal(": EHCI USB controller\n"); 169 170 sc->sc_offs = bus_space_read_1(sc->iot, sc->ioh, EHCI_CAPLENGTH); 171 172 /* Give the EHCI AHB master top arbitration priority (ERR4003 CHIP_16). */ 173 ehci_plb_set_arb_priority(self); 174 175 /* Disable interrupts, so we don't get any spurious ones. */ 176 bus_space_write_4(sc->iot, sc->ioh, sc->sc_offs + EHCI_USBINTR, 0); 177 178 intr_establish_xname(paa->plb_irq, IST_LEVEL, IPL_USB, ehci_intr, 179 sc, device_xname(self)); 180 181 /* Wait until the companion OHCI has attached. */ 182 config_defer(self, ehci_plb_deferred); 183 } 184 185 static void 186 ehci_plb_deferred(device_t self) 187 { 188 struct ehci_softc *sc = device_private(self); 189 device_t comp; 190 int error; 191 192 comp = device_find_by_xname("ohci0"); 193 if (comp != NULL) { 194 sc->sc_ncomp = 1; 195 sc->sc_comps[0] = comp; 196 } 197 198 error = ehci_init(sc); 199 if (error) { 200 aprint_error_dev(self, "init failed, error=%d\n", error); 201 return; 202 } 203 204 sc->sc_child = config_found(self, &sc->sc_bus, usbctlprint, 205 CFARGS_NONE); 206 } 207
Indexes created Tue Jul 07 00:25:39 UTC 2026