FreeBSD/Linux Kernel Cross Reference
sys/riscv/riscv/nexus.c

     /*-
      * Copyright 1998 Massachusetts Institute of Technology
      *
      * Permission to use, copy, modify, and distribute this software and
      * its documentation for any purpose and without fee is hereby
      * granted, provided that both the above copyright notice and this
      * permission notice appear in all copies, that both the above
      * copyright notice and this permission notice appear in all
      * supporting documentation, and that the name of M.I.T. not be used
     * in advertising or publicity pertaining to distribution of the
     * software without specific, written prior permission.  M.I.T. makes
     * no representations about the suitability of this software for any
     * purpose.  It is provided "as is" without express or implied
     * warranty.
     *
     * THIS SOFTWARE IS PROVIDED BY M.I.T. ``AS IS''.  M.I.T. DISCLAIMS
     * ALL EXPRESS OR IMPLIED WARRANTIES WITH REGARD TO THIS SOFTWARE,
     * INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
     * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. IN NO EVENT
     * SHALL M.I.T. 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.
     *
     */
    
    /*
     * This code implements a `root nexus' for RISC-V Architecture
     * machines.  The function of the root nexus is to serve as an
     * attachment point for both processors and buses, and to manage
     * resources which are common to all of them.  In particular,
     * this code implements the core resource managers for interrupt
     * requests, DMA requests (which rightfully should be a part of the
     * ISA code but it's easier to do it here for now), I/O port addresses,
     * and I/O memory address space.
     */
    
    #include <sys/cdefs.h>
    __FBSDID("$FreeBSD: releng/11.2/sys/riscv/riscv/nexus.c 297979 2016-04-14 17:25:50Z pfg $");
    
    #include <sys/param.h>
    #include <sys/systm.h>
    #include <sys/bus.h>
    #include <sys/kernel.h>
    #include <sys/malloc.h>
    #include <sys/module.h>
    #include <machine/bus.h>
    #include <sys/rman.h>
    #include <sys/interrupt.h>
    
    #include <machine/vmparam.h>
    #include <machine/pcb.h>
    #include <vm/vm.h>
    #include <vm/pmap.h>
    
    #include <machine/resource.h>
    #include <machine/intr.h>
    
    #include "opt_platform.h"
    
    #include <dev/fdt/fdt_common.h>
    #include "ofw_bus_if.h"
    
    extern struct bus_space memmap_bus;
    
    static MALLOC_DEFINE(M_NEXUSDEV, "nexusdev", "Nexus device");
    
    struct nexus_device {
            struct resource_list    nx_resources;
    };
    
    #define DEVTONX(dev)    ((struct nexus_device *)device_get_ivars(dev))
    
    static struct rman mem_rman;
    static struct rman irq_rman;
    
    static device_probe_t nexus_fdt_probe;
    static int nexus_attach(device_t);
    
    static  int nexus_print_child(device_t, device_t);
    static  device_t nexus_add_child(device_t, u_int, const char *, int);
    static  struct resource *nexus_alloc_resource(device_t, device_t, int, int *,
        u_long, u_long, u_long, u_int);
    static  int nexus_activate_resource(device_t, device_t, int, int,
        struct resource *);
    static int nexus_config_intr(device_t dev, int irq, enum intr_trigger trig,
        enum intr_polarity pol);
    static struct resource_list *nexus_get_reslist(device_t, device_t);
    static  int nexus_set_resource(device_t, device_t, int, int, u_long, u_long);
    static  int nexus_deactivate_resource(device_t, device_t, int, int,
        struct resource *);
    
    static int nexus_setup_intr(device_t dev, device_t child, struct resource *res,
        int flags, driver_filter_t *filt, driver_intr_t *intr, void *arg, void **cookiep);
    static int nexus_teardown_intr(device_t, device_t, struct resource *, void *);
   
   static int nexus_ofw_map_intr(device_t dev, device_t child, phandle_t iparent,
       int icells, pcell_t *intr);
   
   static device_method_t nexus_methods[] = {
           /* Device interface */
           DEVMETHOD(device_probe,         nexus_fdt_probe),
           DEVMETHOD(device_attach,        nexus_attach),
   
           /* OFW interface */
           DEVMETHOD(ofw_bus_map_intr,     nexus_ofw_map_intr),
   
           /* Bus interface */
           DEVMETHOD(bus_print_child,      nexus_print_child),
           DEVMETHOD(bus_add_child,        nexus_add_child),
           DEVMETHOD(bus_alloc_resource,   nexus_alloc_resource),
           DEVMETHOD(bus_activate_resource,        nexus_activate_resource),
           DEVMETHOD(bus_config_intr,      nexus_config_intr),
           DEVMETHOD(bus_get_resource_list, nexus_get_reslist),
           DEVMETHOD(bus_set_resource,     nexus_set_resource),
           DEVMETHOD(bus_deactivate_resource,      nexus_deactivate_resource),
           DEVMETHOD(bus_setup_intr,       nexus_setup_intr),
           DEVMETHOD(bus_teardown_intr,    nexus_teardown_intr),
   
           { 0, 0 }
   };
   
   static driver_t nexus_fdt_driver = {
           "nexus",
           nexus_methods,
           1                       /* no softc */
   };
   
   static int
   nexus_fdt_probe(device_t dev)
   {
   
           device_quiet(dev);
           return (BUS_PROBE_DEFAULT);
   }
   
   static int
   nexus_attach(device_t dev)
   {
   
           mem_rman.rm_start = 0;
           mem_rman.rm_end = BUS_SPACE_MAXADDR;
           mem_rman.rm_type = RMAN_ARRAY;
           mem_rman.rm_descr = "I/O memory addresses";
           if (rman_init(&mem_rman) ||
               rman_manage_region(&mem_rman, 0, BUS_SPACE_MAXADDR))
                   panic("nexus_attach mem_rman");
           irq_rman.rm_start = 0;
           irq_rman.rm_end = ~0;
           irq_rman.rm_type = RMAN_ARRAY;
           irq_rman.rm_descr = "Interrupts";
           if (rman_init(&irq_rman) || rman_manage_region(&irq_rman, 0, ~0))
                   panic("nexus_attach irq_rman");
   
           nexus_add_child(dev, 10, "ofwbus", 0);
   
           bus_generic_probe(dev);
           bus_generic_attach(dev);
   
           return (0);
   }
   
   static int
   nexus_print_child(device_t bus, device_t child)
   {
           int retval = 0;
   
           retval += bus_print_child_header(bus, child);
           retval += printf("\n");
   
           return (retval);
   }
   
   static device_t
   nexus_add_child(device_t bus, u_int order, const char *name, int unit)
   {
           device_t child;
           struct nexus_device *ndev;
   
           ndev = malloc(sizeof(struct nexus_device), M_NEXUSDEV, M_NOWAIT|M_ZERO);
           if (!ndev)
                   return (0);
           resource_list_init(&ndev->nx_resources);
   
           child = device_add_child_ordered(bus, order, name, unit);
   
           /* should we free this in nexus_child_detached? */
           device_set_ivars(child, ndev);
   
           return (child);
   }
   
   
   /*
    * Allocate a resource on behalf of child.  NB: child is usually going to be a
    * child of one of our descendants, not a direct child of nexus0.
    * (Exceptions include footbridge.)
    */
   static struct resource *
   nexus_alloc_resource(device_t bus, device_t child, int type, int *rid,
       u_long start, u_long end, u_long count, u_int flags)
   {
           struct nexus_device *ndev = DEVTONX(child);
           struct resource *rv;
           struct resource_list_entry *rle;
           struct rman *rm;
           int needactivate = flags & RF_ACTIVE;
   
           /*
            * If this is an allocation of the "default" range for a given
            * RID, and we know what the resources for this device are
            * (ie. they aren't maintained by a child bus), then work out
            * the start/end values.
            */
           if (RMAN_IS_DEFAULT_RANGE(start, end) && (count == 1)) {
                   if (device_get_parent(child) != bus || ndev == NULL)
                           return(NULL);
                   rle = resource_list_find(&ndev->nx_resources, type, *rid);
                   if (rle == NULL)
                           return(NULL);
                   start = rle->start;
                   end = rle->end;
                   count = rle->count;
           }
   
           switch (type) {
           case SYS_RES_IRQ:
                   rm = &irq_rman;
                   break;
   
           case SYS_RES_MEMORY:
           case SYS_RES_IOPORT:
                   rm = &mem_rman;
                   break;
   
           default:
                   return (NULL);
           }
   
           rv = rman_reserve_resource(rm, start, end, count, flags, child);
           if (rv == NULL)
                   return (NULL);
   
           rman_set_rid(rv, *rid);
           rman_set_bushandle(rv, rman_get_start(rv));
   
           if (needactivate) {
                   if (bus_activate_resource(child, type, *rid, rv)) {
                           rman_release_resource(rv);
                           return (NULL);
                   }
           }
   
           return (rv);
   }
   
   static int
   nexus_config_intr(device_t dev, int irq, enum intr_trigger trig,
       enum intr_polarity pol)
   {
   
           return (riscv_config_intr(irq, trig, pol));
   }
   
   static int
   nexus_setup_intr(device_t dev, device_t child, struct resource *res, int flags,
       driver_filter_t *filt, driver_intr_t *intr, void *arg, void **cookiep)
   {
           int error;
   
           if ((rman_get_flags(res) & RF_SHAREABLE) == 0)
                   flags |= INTR_EXCL;
   
           /* We depend here on rman_activate_resource() being idempotent. */
           error = rman_activate_resource(res);
           if (error)
                   return (error);
   
           error = riscv_setup_intr(device_get_nameunit(child), filt, intr,
               arg, rman_get_start(res), flags, cookiep);
   
           return (error);
   }
   
   static int
   nexus_teardown_intr(device_t dev, device_t child, struct resource *r, void *ih)
   {
   
           return (riscv_teardown_intr(ih));
   }
   
   static int
   nexus_activate_resource(device_t bus, device_t child, int type, int rid,
       struct resource *r)
   {
           int err;
           bus_addr_t paddr;
           bus_size_t psize;
           bus_space_handle_t vaddr;
   
           if ((err = rman_activate_resource(r)) != 0)
                   return (err);
   
           /*
            * If this is a memory resource, map it into the kernel.
            */
           if (type == SYS_RES_MEMORY || type == SYS_RES_IOPORT) {
                   paddr = (bus_addr_t)rman_get_start(r);
                   psize = (bus_size_t)rman_get_size(r);
                   err = bus_space_map(&memmap_bus, paddr, psize, 0, &vaddr);
                   if (err != 0) {
                           rman_deactivate_resource(r);
                           return (err);
                   }
                   rman_set_bustag(r, &memmap_bus);
                   rman_set_virtual(r, (void *)vaddr);
                   rman_set_bushandle(r, vaddr);
           }
           return (0);
   }
   
   static struct resource_list *
   nexus_get_reslist(device_t dev, device_t child)
   {
           struct nexus_device *ndev = DEVTONX(child);
   
           return (&ndev->nx_resources);
   }
   
   static int
   nexus_set_resource(device_t dev, device_t child, int type, int rid,
       u_long start, u_long count)
   {
           struct nexus_device     *ndev = DEVTONX(child);
           struct resource_list    *rl = &ndev->nx_resources;
   
           /* XXX this should return a success/failure indicator */
           resource_list_add(rl, type, rid, start, start + count - 1, count);
   
           return(0);
   }
   
   
   static int
   nexus_deactivate_resource(device_t bus, device_t child, int type, int rid,
       struct resource *r)
   {
           bus_size_t psize;
           bus_space_handle_t vaddr;
   
           psize = (bus_size_t)rman_get_size(r);
           vaddr = rman_get_bushandle(r);
   
           if (vaddr != 0) {
                   bus_space_unmap(&memmap_bus, vaddr, psize);
                   rman_set_virtual(r, NULL);
                   rman_set_bushandle(r, 0);
           }
   
           return (rman_deactivate_resource(r));
   }
   
   static devclass_t nexus_fdt_devclass;
   
   EARLY_DRIVER_MODULE(nexus_fdt, root, nexus_fdt_driver, nexus_fdt_devclass,
       0, 0, BUS_PASS_BUS + BUS_PASS_ORDER_FIRST);
   
   static int
   nexus_ofw_map_intr(device_t dev, device_t child, phandle_t iparent, int icells,
       pcell_t *intr)
   {
           int irq;
   
           if (icells == 3) {
                   irq = intr[1];
                   if (intr[0] == 0)
                           irq += 32; /* SPI */
                   else
                           irq += 16; /* PPI */
           } else
                   irq = intr[0];
   
           return (irq);
   }

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