tzic.c

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    1 /*-
    2  * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
    3  *
    4  * Copyright (c) 2012, 2013 The FreeBSD Foundation
    5  *
    6  * This software was developed by Oleksandr Rybalko under sponsorship
    7  * from the FreeBSD Foundation.
    8  *
    9  * Redistribution and use in source and binary forms, with or without
   10  * modification, are permitted provided that the following conditions
   11  * are met:
   12  * 1.   Redistributions of source code must retain the above copyright
   13  *      notice, this list of conditions and the following disclaimer.
   14  * 2.   Redistributions in binary form must reproduce the above copyright
   15  *      notice, this list of conditions and the following disclaimer in the
   16  *      documentation and/or other materials provided with the distribution.
   17  *
   18  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
   19  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   20  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   21  * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
   22  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   23  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   24  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   25  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   26  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   27  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   28  * SUCH DAMAGE.
   29  */
   30 
   31 #include <sys/cdefs.h>
   32 __FBSDID("$FreeBSD$");
   33 
   34 #include <sys/param.h>
   35 #include <sys/systm.h>
   36 #include <sys/bus.h>
   37 #include <sys/kernel.h>
   38 #include <sys/module.h>
   39 #include <sys/rman.h>
   40 #include <sys/proc.h>
   41 #include <sys/lock.h>
   42 #include <sys/mutex.h>
   43 
   44 #include <machine/bus.h>
   45 #include <machine/intr.h>
   46 
   47 #include <dev/ofw/openfirm.h>
   48 #include <dev/ofw/ofw_bus.h>
   49 #include <dev/ofw/ofw_bus_subr.h>
   50 
   51 #include <arm/freescale/imx/imx51_tzicreg.h>
   52 
   53 #include "pic_if.h"
   54 
   55 #define TZIC_NIRQS      128
   56 
   57 struct tzic_irqsrc {
   58         struct intr_irqsrc      isrc;
   59         u_int                   irq;
   60 };
   61 
   62 struct tzic_softc {
   63         device_t           dev;
   64         struct resource    *tzicregs;
   65         struct tzic_irqsrc isrcs[TZIC_NIRQS];
   66 };
   67 
   68 static struct tzic_softc *tzic_sc;
   69 
   70 static inline uint32_t
   71 tzic_read_4(struct tzic_softc *sc, int reg)
   72 {
   73 
   74         return (bus_read_4(sc->tzicregs, reg));
   75 }
   76 
   77 static inline void
   78 tzic_write_4(struct tzic_softc *sc, int reg, uint32_t val)
   79 {
   80 
   81     bus_write_4(sc->tzicregs, reg, val);
   82 }
   83 
   84 static inline void
   85 tzic_irq_eoi(struct tzic_softc *sc)
   86 {
   87 
   88         tzic_write_4(sc, TZIC_PRIOMASK, 0xff);
   89 }
   90 
   91 static inline void
   92 tzic_irq_mask(struct tzic_softc *sc, u_int irq)
   93 {
   94 
   95         tzic_write_4(sc, TZIC_ENCLEAR(irq >> 5), (1u << (irq & 0x1f)));
   96 }
   97 
   98 static inline void
   99 tzic_irq_unmask(struct tzic_softc *sc, u_int irq)
  100 {
  101 
  102         tzic_write_4(sc, TZIC_ENSET(irq >> 5), (1u << (irq & 0x1f)));
  103 }
  104 
  105 static int
  106 tzic_intr(void *arg)
  107 {
  108         struct tzic_softc *sc = arg;
  109         int b, i, irq;
  110         uint32_t pending;
  111 
  112         /* Get active interrupt */
  113         for (i = 0; i < TZIC_NIRQS / 32; ++i) {
  114                 pending = tzic_read_4(sc, TZIC_PND(i));
  115                 if ((b = 31 - __builtin_clz(pending)) < 0)
  116                         continue;
  117                 irq = i * 32 + b;
  118                 tzic_write_4(sc, TZIC_PRIOMASK, 0);
  119                 if (intr_isrc_dispatch(&sc->isrcs[irq].isrc,
  120                     curthread->td_intr_frame) != 0) {
  121                         tzic_irq_mask(sc, irq);
  122                         tzic_irq_eoi(sc);
  123                         arm_irq_memory_barrier(irq);
  124                         if (bootverbose) {
  125                                 device_printf(sc->dev, 
  126                                     "Stray irq %u disabled\n", irq);
  127                         }
  128                 }
  129                 return (FILTER_HANDLED);
  130         }
  131 
  132         if (bootverbose)
  133                 device_printf(sc->dev, "Spurious interrupt detected\n");
  134 
  135         return (FILTER_HANDLED);
  136 }
  137 
  138 static void
  139 tzic_enable_intr(device_t dev, struct intr_irqsrc *isrc)
  140 {
  141         u_int irq = ((struct tzic_irqsrc *)isrc)->irq;
  142         struct tzic_softc *sc = device_get_softc(dev);
  143 
  144         arm_irq_memory_barrier(irq);
  145         tzic_irq_unmask(sc, irq);
  146 }
  147 
  148 static void
  149 tzic_disable_intr(device_t dev, struct intr_irqsrc *isrc)
  150 {
  151         u_int irq = ((struct tzic_irqsrc *)isrc)->irq;
  152         struct tzic_softc *sc = device_get_softc(dev);
  153 
  154         tzic_irq_mask(sc, irq);
  155 }
  156 
  157 static int
  158 tzic_map_intr(device_t dev, struct intr_map_data *data,
  159     struct intr_irqsrc **isrcp)
  160 {
  161         struct intr_map_data_fdt *daf;
  162         struct tzic_softc *sc;
  163 
  164         if (data->type != INTR_MAP_DATA_FDT)
  165                 return (ENOTSUP);
  166 
  167         daf = (struct intr_map_data_fdt *)data;
  168         if (daf->ncells != 1 || daf->cells[0] >= TZIC_NIRQS)
  169                 return (EINVAL);
  170 
  171         sc = device_get_softc(dev);
  172         *isrcp = &sc->isrcs[daf->cells[0]].isrc;
  173 
  174         return (0);
  175 }
  176 
  177 static void
  178 tzic_pre_ithread(device_t dev, struct intr_irqsrc *isrc)
  179 {
  180         struct tzic_softc *sc = device_get_softc(dev);
  181 
  182         tzic_irq_mask(sc, ((struct tzic_irqsrc *)isrc)->irq);
  183         tzic_irq_eoi(sc);
  184 }
  185 
  186 static void
  187 tzic_post_ithread(device_t dev, struct intr_irqsrc *isrc)
  188 {
  189 
  190         tzic_enable_intr(dev, isrc);
  191 }
  192 
  193 static void
  194 tzic_post_filter(device_t dev, struct intr_irqsrc *isrc)
  195 {
  196 
  197         tzic_irq_eoi(device_get_softc(dev));
  198 }
  199 
  200 static int
  201 tzic_pic_attach(struct tzic_softc *sc)
  202 {
  203         struct intr_pic *pic;
  204         const char *name;
  205         intptr_t xref;
  206         int error;
  207         u_int irq;
  208 
  209         name = device_get_nameunit(sc->dev);
  210         for (irq = 0; irq < TZIC_NIRQS; irq++) {
  211                 sc->isrcs[irq].irq = irq;
  212                 error = intr_isrc_register(&sc->isrcs[irq].isrc,
  213                     sc->dev, 0, "%s,%u", name, irq);
  214                 if (error != 0)
  215                         return (error);
  216         }
  217 
  218         xref = OF_xref_from_node(ofw_bus_get_node(sc->dev));
  219         pic = intr_pic_register(sc->dev, xref);
  220         if (pic == NULL)
  221                 return (ENXIO);
  222 
  223         return (intr_pic_claim_root(sc->dev, xref, tzic_intr, sc, 0));
  224 }
  225 
  226 static int
  227 tzic_probe(device_t dev)
  228 {
  229 
  230         if (!ofw_bus_status_okay(dev))
  231                 return (ENXIO);
  232 
  233         if (ofw_bus_is_compatible(dev, "fsl,tzic")) {
  234                 device_set_desc(dev, "TrustZone Interrupt Controller");
  235                 return (BUS_PROBE_DEFAULT);
  236         }
  237         return (ENXIO);
  238 }
  239 
  240 static int
  241 tzic_attach(device_t dev)
  242 {
  243         struct tzic_softc *sc = device_get_softc(dev);
  244         int i;
  245 
  246         if (tzic_sc)
  247                 return (ENXIO);
  248         tzic_sc = sc;
  249         sc->dev = dev;
  250 
  251         i = 0;
  252         sc->tzicregs = bus_alloc_resource_any(dev, SYS_RES_MEMORY, &i,
  253             RF_ACTIVE);
  254         if (sc->tzicregs == NULL) {
  255                 device_printf(dev, "could not allocate resources\n");
  256                 return (ENXIO);
  257         }
  258 
  259         /* route all interrupts to IRQ.  secure interrupts are for FIQ */
  260         for (i = 0; i < 4; i++)
  261                 tzic_write_4(sc, TZIC_INTSEC(i), 0xffffffff);
  262 
  263         /* disable all interrupts */
  264         for (i = 0; i < 4; i++)
  265                 tzic_write_4(sc, TZIC_ENCLEAR(i), 0xffffffff);
  266 
  267         /* Set all interrupts to priority 0 (max). */
  268         for (i = 0; i < 128 / 4; ++i)
  269                 tzic_write_4(sc, TZIC_PRIORITY(i), 0);
  270 
  271         /*
  272          * Set priority mask to lowest (unmasked) prio, set synchronizer to
  273          * low-latency mode (as opposed to low-power), enable the controller.
  274          */
  275         tzic_write_4(sc, TZIC_PRIOMASK, 0xff);
  276         tzic_write_4(sc, TZIC_SYNCCTRL, 0);
  277         tzic_write_4(sc, TZIC_INTCNTL, INTCNTL_NSEN_MASK|INTCNTL_NSEN|INTCNTL_EN);
  278 
  279         /* Register as a root pic. */
  280         if (tzic_pic_attach(sc) != 0) {
  281                 device_printf(dev, "could not attach PIC\n");
  282                 return (ENXIO);
  283         }
  284 
  285         return (0);
  286 }
  287 
  288 static device_method_t tzic_methods[] = {
  289         DEVMETHOD(device_probe,         tzic_probe),
  290         DEVMETHOD(device_attach,        tzic_attach),
  291 
  292         DEVMETHOD(pic_disable_intr,     tzic_disable_intr),
  293         DEVMETHOD(pic_enable_intr,      tzic_enable_intr),
  294         DEVMETHOD(pic_map_intr,         tzic_map_intr),
  295         DEVMETHOD(pic_post_filter,      tzic_post_filter),
  296         DEVMETHOD(pic_post_ithread,     tzic_post_ithread),
  297         DEVMETHOD(pic_pre_ithread,      tzic_pre_ithread),
  298 
  299         DEVMETHOD_END
  300 };
  301 
  302 static driver_t tzic_driver = {
  303         "tzic",
  304         tzic_methods,
  305         sizeof(struct tzic_softc),
  306 };
  307 
  308 EARLY_DRIVER_MODULE(tzic, ofwbus, tzic_driver, 0, 0, BUS_PASS_INTERRUPT);

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FreeBSD/Linux Kernel Cross Reference sys/arm/freescale/imx/tzic.c

FreeBSD/Linux Kernel Cross Reference
sys/arm/freescale/imx/tzic.c