sys/powerpc/ps3/ps3pic.c

   1 /*-
   2  * Copyright 2010 Nathan Whitehorn
   3  *
   4  * Redistribution and use in source and binary forms, with or without
   5  * modification, are permitted provided that the following conditions
   6  * are met:
   7  * 1. Redistributions of source code must retain the above copyright
   8  *    notice, this list of conditions and the following disclaimer.
   9  * 2. Redistributions in binary form must reproduce the above copyright
  10  *    notice, this list of conditions and the following disclaimer in the
  11  *    documentation and/or other materials provided with the distribution.
  12  *
  13  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
  14  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
  15  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
  16  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
  17  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
  18  * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
  19  * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
  20  * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
  21  * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  22  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  23  * SUCH DAMAGE.
  24  *
  25  * $FreeBSD$
  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);
  53 static void     ps3pic_eoi(device_t, u_int);
  54 static void     ps3pic_ipi(device_t, u_int);
  55 static void     ps3pic_mask(device_t, u_int);
  56 static void     ps3pic_unmask(device_t, u_int);
  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         int             sc_vector[64];
  66 };
  67
  68 static device_method_t  ps3pic_methods[] = {
  69         /* Device interface */
  70         DEVMETHOD(device_identify,      ps3pic_identify),
  71         DEVMETHOD(device_probe,         ps3pic_probe),
  72         DEVMETHOD(device_attach,        ps3pic_attach),
  73
  74         /* PIC interface */
  75         DEVMETHOD(pic_dispatch,         ps3pic_dispatch),
  76         DEVMETHOD(pic_enable,           ps3pic_enable),
  77         DEVMETHOD(pic_eoi,              ps3pic_eoi),
  78         DEVMETHOD(pic_ipi,              ps3pic_ipi),
  79         DEVMETHOD(pic_mask,             ps3pic_mask),
  80         DEVMETHOD(pic_unmask,           ps3pic_unmask),
  81
  82         { 0, 0 },
  83 };
  84
  85 static driver_t ps3pic_driver = {
  86         "ps3pic",
  87         ps3pic_methods,
  88         sizeof(struct ps3pic_softc)
  89 };
  90
  91 static devclass_t ps3pic_devclass;
  92
  93 DRIVER_MODULE(ps3pic, nexus, ps3pic_driver, ps3pic_devclass, 0, 0);
  94
  95 static MALLOC_DEFINE(M_PS3PIC, "ps3pic", "PS3 PIC");
  96
  97 static void
  98 ps3pic_identify(driver_t *driver, device_t parent)
  99 {
 100         if (strcmp(installed_platform(), "ps3") != 0)
 101                 return;
 102
 103         if (device_find_child(parent, "ps3pic", -1) == NULL)
 104                 BUS_ADD_CHILD(parent, 0, "ps3pic", 0);
 105 }
 106
 107 static int
 108 ps3pic_probe(device_t dev)
 109 {
 110         device_set_desc(dev, "Playstation 3 interrupt controller");
 111         return (BUS_PROBE_NOWILDCARD);
 112 }
 113
 114 static int
 115 ps3pic_attach(device_t dev)
 116 {
 117         struct ps3pic_softc *sc;
 118         uint64_t ppe;
 119         int thread;
 120
 121         sc = device_get_softc(dev);
 122
 123         sc->bitmap_thread0 = contigmalloc(128 /* 512 bits * 2 */, M_PS3PIC,
 124             M_NOWAIT | M_ZERO, 0, BUS_SPACE_MAXADDR, 64 /* alignment */,
 125             PAGE_SIZE /* boundary */);
 126         sc->mask_thread0 = sc->bitmap_thread0 + 4;
 127         sc->bitmap_thread1 = sc->bitmap_thread0 + 8;
 128         sc->mask_thread1 = sc->bitmap_thread0 + 12;
 129
 130         lv1_get_logical_ppe_id(&ppe);
 131         thread = 32 - fls(mfctrl());
 132         lv1_configure_irq_state_bitmap(ppe, thread,
 133             vtophys(sc->bitmap_thread0));
 134 #ifdef SMP
 135         lv1_configure_irq_state_bitmap(ppe, !thread,
 136             vtophys(sc->bitmap_thread1));
 137
 138         /* Map both IPIs to the same VIRQ to avoid changes in intr_machdep */
 139         lv1_construct_event_receive_port(&sc->sc_ipi_outlet[0]);
 140         lv1_connect_irq_plug_ext(ppe, thread, sc->sc_ipi_outlet[0],
 141             sc->sc_ipi_outlet[0], 0);
 142         lv1_construct_event_receive_port(&sc->sc_ipi_outlet[1]);
 143         lv1_connect_irq_plug_ext(ppe, !thread, sc->sc_ipi_outlet[0],
 144             sc->sc_ipi_outlet[1], 0);
 145 #endif
 146
 147         powerpc_register_pic(dev, 0, sc->sc_ipi_outlet[0], 1, FALSE);
 148         return (0);
 149 }
 150
 151 /*
 152  * PIC I/F methods.
 153  */
 154
 155 static void
 156 ps3pic_dispatch(device_t dev, struct trapframe *tf)
 157 {
 158         uint64_t bitmap, mask;
 159         int irq;
 160         struct ps3pic_softc *sc;
 161
 162         sc = device_get_softc(dev);
 163
 164         if (PCPU_GET(cpuid) == 0) {
 165                 bitmap = sc->bitmap_thread0[0];
 166                 mask = sc->mask_thread0[0];
 167         } else {
 168                 bitmap = sc->bitmap_thread1[0];
 169                 mask = sc->mask_thread1[0];
 170         }
 171
 172         while ((irq = ffsl(bitmap & mask) - 1) != -1) {
 173                 bitmap &= ~(1UL << irq);
 174                 powerpc_dispatch_intr(sc->sc_vector[63 - irq], tf);
 175         }
 176 }
 177
 178 static void
 179 ps3pic_enable(device_t dev, u_int irq, u_int vector)
 180 {
 181         struct ps3pic_softc *sc;
 182
 183         sc = device_get_softc(dev);
 184         sc->sc_vector[irq] = vector;
 185
 186         ps3pic_unmask(dev, irq);
 187 }
 188
 189 static void
 190 ps3pic_eoi(device_t dev, u_int irq)
 191 {
 192         uint64_t ppe;
 193         int thread;
 194
 195         lv1_get_logical_ppe_id(&ppe);
 196         thread = 32 - fls(mfctrl());
 197
 198         lv1_end_of_interrupt_ext(ppe, thread, irq);
 199 }
 200
 201 static void
 202 ps3pic_ipi(device_t dev, u_int cpu)
 203 {
 204         struct ps3pic_softc *sc;
 205         sc = device_get_softc(dev);
 206
 207         lv1_send_event_locally(sc->sc_ipi_outlet[cpu]);
 208 }
 209
 210 static void
 211 ps3pic_mask(device_t dev, u_int irq)
 212 {
 213         struct ps3pic_softc *sc;
 214         uint64_t ppe;
 215
 216         sc = device_get_softc(dev);
 217
 218         /* Do not mask IPIs! */
 219         if (irq == sc->sc_ipi_outlet[0])
 220                 return;
 221
 222         atomic_clear_64(&sc->mask_thread0[0], 1UL << (63 - irq));
 223         atomic_clear_64(&sc->mask_thread1[0], 1UL << (63 - irq));
 224
 225         lv1_get_logical_ppe_id(&ppe);
 226         lv1_did_update_interrupt_mask(ppe, 0);
 227         lv1_did_update_interrupt_mask(ppe, 1);
 228 }
 229
 230 static void
 231 ps3pic_unmask(device_t dev, u_int irq)
 232 {
 233         struct ps3pic_softc *sc;
 234         uint64_t ppe;
 235
 236         sc = device_get_softc(dev);
 237         atomic_set_64(&sc->mask_thread0[0], 1UL << (63 - irq));
 238         atomic_set_64(&sc->mask_thread1[0], 1UL << (63 - irq));
 239
 240         lv1_get_logical_ppe_id(&ppe);
 241         lv1_did_update_interrupt_mask(ppe, 0);
 242         lv1_did_update_interrupt_mask(ppe, 1);
 243 }