sys/powerpc/ps3/ps3pic.c

   1 /*-
   2  * SPDX-License-Identifier: BSD-2-Clause
   3  *
   4  * Copyright 2010 Nathan Whitehorn
   5  *
   6  * Redistribution and use in source and binary forms, with or without
   7  * modification, are permitted provided that the following conditions
   8  * are met:
   9  * 1. Redistributions of source code must retain the above copyright
  10  *    notice, this list of conditions and the following disclaimer.
  11  * 2. Redistributions in binary form must reproduce the above copyright
  12  *    notice, this list of conditions and the following disclaimer in the
  13  *    documentation and/or other materials provided with the distribution.
  14  *
  15  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
  16  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
  17  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
  18  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
  19  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
  20  * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
  21  * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
  22  * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
  23  * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  24  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  25  * SUCH DAMAGE.
  26  */
  27
  28 #include <sys/param.h>
  29 #include <sys/systm.h>
  30 #include <sys/module.h>
  31 #include <sys/bus.h>
  32 #include <sys/conf.h>
  33 #include <sys/kernel.h>
  34 #include <sys/malloc.h>
  35
  36 #include <vm/vm.h>
  37 #include <vm/pmap.h>
  38
  39 #include <machine/bus.h>
  40 #include <machine/intr_machdep.h>
  41 #include <machine/md_var.h>
  42 #include <machine/platform.h>
  43
  44 #include "ps3-hvcall.h"
  45 #include "pic_if.h"
  46
  47 static void     ps3pic_identify(driver_t *driver, device_t parent);
  48 static int      ps3pic_probe(device_t);
  49 static int      ps3pic_attach(device_t);
  50
  51 static void     ps3pic_dispatch(device_t, struct trapframe *);
  52 static void     ps3pic_enable(device_t, u_int, u_int, void **);
  53 static void     ps3pic_eoi(device_t, u_int, void *);
  54 static void     ps3pic_ipi(device_t, u_int);
  55 static void     ps3pic_mask(device_t, u_int, void *);
  56 static void     ps3pic_unmask(device_t, u_int, void *);
  57
  58 struct ps3pic_softc {
  59         volatile uint64_t *bitmap_thread0;
  60         volatile uint64_t *mask_thread0;
  61         volatile uint64_t *bitmap_thread1;
  62         volatile uint64_t *mask_thread1;
  63
  64         uint64_t        sc_ipi_outlet[2];
  65         uint64_t        sc_ipi_virq;
  66         int             sc_vector[64];
  67 };
  68
  69 static device_method_t  ps3pic_methods[] = {
  70         /* Device interface */
  71         DEVMETHOD(device_identify,      ps3pic_identify),
  72         DEVMETHOD(device_probe,         ps3pic_probe),
  73         DEVMETHOD(device_attach,        ps3pic_attach),
  74
  75         /* PIC interface */
  76         DEVMETHOD(pic_dispatch,         ps3pic_dispatch),
  77         DEVMETHOD(pic_enable,           ps3pic_enable),
  78         DEVMETHOD(pic_eoi,              ps3pic_eoi),
  79         DEVMETHOD(pic_ipi,              ps3pic_ipi),
  80         DEVMETHOD(pic_mask,             ps3pic_mask),
  81         DEVMETHOD(pic_unmask,           ps3pic_unmask),
  82
  83         { 0, 0 },
  84 };
  85
  86 static driver_t ps3pic_driver = {
  87         "ps3pic",
  88         ps3pic_methods,
  89         sizeof(struct ps3pic_softc)
  90 };
  91
  92 DRIVER_MODULE(ps3pic, nexus, ps3pic_driver, 0, 0);
  93
  94 static MALLOC_DEFINE(M_PS3PIC, "ps3pic", "PS3 PIC");
  95
  96 static void
  97 ps3pic_identify(driver_t *driver, device_t parent)
  98 {
  99         if (strcmp(installed_platform(), "ps3") != 0)
 100                 return;
 101
 102         if (device_find_child(parent, "ps3pic", -1) == NULL)
 103                 BUS_ADD_CHILD(parent, 0, "ps3pic", 0);
 104 }
 105
 106 static int
 107 ps3pic_probe(device_t dev)
 108 {
 109         device_set_desc(dev, "Playstation 3 interrupt controller");
 110         return (BUS_PROBE_NOWILDCARD);
 111 }
 112
 113 static int
 114 ps3pic_attach(device_t dev)
 115 {
 116         struct ps3pic_softc *sc;
 117         uint64_t ppe;
 118         int thread;
 119
 120         sc = device_get_softc(dev);
 121
 122         sc->bitmap_thread0 = contigmalloc(128 /* 512 bits * 2 */, M_PS3PIC,
 123             M_NOWAIT | M_ZERO, 0, BUS_SPACE_MAXADDR, 64 /* alignment */,
 124             PAGE_SIZE /* boundary */);
 125         sc->mask_thread0 = sc->bitmap_thread0 + 4;
 126         sc->bitmap_thread1 = sc->bitmap_thread0 + 8;
 127         sc->mask_thread1 = sc->bitmap_thread0 + 12;
 128
 129         lv1_get_logical_ppe_id(&ppe);
 130         thread = 32 - fls(mfctrl());
 131         lv1_configure_irq_state_bitmap(ppe, thread,
 132             vtophys(sc->bitmap_thread0));
 133
 134         sc->sc_ipi_virq = 63;
 135
 136 #ifdef SMP
 137         lv1_configure_irq_state_bitmap(ppe, !thread,
 138             vtophys(sc->bitmap_thread1));
 139
 140         /* Map both IPIs to the same VIRQ to avoid changes in intr_machdep */
 141         lv1_construct_event_receive_port(&sc->sc_ipi_outlet[0]);
 142         lv1_connect_irq_plug_ext(ppe, thread, sc->sc_ipi_virq,
 143             sc->sc_ipi_outlet[0], 0);
 144         lv1_construct_event_receive_port(&sc->sc_ipi_outlet[1]);
 145         lv1_connect_irq_plug_ext(ppe, !thread, sc->sc_ipi_virq,
 146             sc->sc_ipi_outlet[1], 0);
 147 #endif
 148
 149         powerpc_register_pic(dev, 0, sc->sc_ipi_virq, 1, FALSE);
 150         return (0);
 151 }
 152
 153 /*
 154  * PIC I/F methods.
 155  */
 156
 157 static void
 158 ps3pic_dispatch(device_t dev, struct trapframe *tf)
 159 {
 160         uint64_t bitmap, mask;
 161         int irq;
 162         struct ps3pic_softc *sc;
 163
 164         sc = device_get_softc(dev);
 165
 166         if (PCPU_GET(cpuid) == 0) {
 167                 bitmap = atomic_readandclear_64(&sc->bitmap_thread0[0]);
 168                 mask = sc->mask_thread0[0];
 169         } else {
 170                 bitmap = atomic_readandclear_64(&sc->bitmap_thread1[0]);
 171                 mask = sc->mask_thread1[0];
 172         }
 173         powerpc_sync();
 174
 175         while ((irq = ffsl(bitmap & mask) - 1) != -1) {
 176                 bitmap &= ~(1UL << irq);
 177                 powerpc_dispatch_intr(sc->sc_vector[63 - irq], tf);
 178         }
 179 }
 180
 181 static void
 182 ps3pic_enable(device_t dev, u_int irq, u_int vector, void **priv)
 183 {
 184         struct ps3pic_softc *sc;
 185
 186         sc = device_get_softc(dev);
 187         sc->sc_vector[irq] = vector;
 188
 189         ps3pic_unmask(dev, irq, priv);
 190 }
 191
 192 static void
 193 ps3pic_eoi(device_t dev, u_int irq, void *priv)
 194 {
 195         uint64_t ppe;
 196         int thread;
 197
 198         lv1_get_logical_ppe_id(&ppe);
 199         thread = 32 - fls(mfctrl());
 200
 201         lv1_end_of_interrupt_ext(ppe, thread, irq);
 202 }
 203
 204 static void
 205 ps3pic_ipi(device_t dev, u_int cpu)
 206 {
 207         struct ps3pic_softc *sc;
 208         sc = device_get_softc(dev);
 209
 210         lv1_send_event_locally(sc->sc_ipi_outlet[cpu]);
 211 }
 212
 213 static void
 214 ps3pic_mask(device_t dev, u_int irq, void *priv)
 215 {
 216         struct ps3pic_softc *sc;
 217         uint64_t ppe;
 218
 219         sc = device_get_softc(dev);
 220
 221         /* Do not mask IPIs! */
 222         if (irq == sc->sc_ipi_virq)
 223                 return;
 224
 225         atomic_clear_64(&sc->mask_thread0[0], 1UL << (63 - irq));
 226         atomic_clear_64(&sc->mask_thread1[0], 1UL << (63 - irq));
 227
 228         lv1_get_logical_ppe_id(&ppe);
 229         lv1_did_update_interrupt_mask(ppe, 0);
 230         lv1_did_update_interrupt_mask(ppe, 1);
 231 }
 232
 233 static void
 234 ps3pic_unmask(device_t dev, u_int irq, void *priv)
 235 {
 236         struct ps3pic_softc *sc;
 237         uint64_t ppe;
 238
 239         sc = device_get_softc(dev);
 240         atomic_set_64(&sc->mask_thread0[0], 1UL << (63 - irq));
 241         atomic_set_64(&sc->mask_thread1[0], 1UL << (63 - irq));
 242
 243         lv1_get_logical_ppe_id(&ppe);
 244         lv1_did_update_interrupt_mask(ppe, 0);
 245         lv1_did_update_interrupt_mask(ppe, 1);
 246 }