macgpio.c

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    1 /*-
    2  * Copyright 2008 by Nathan Whitehorn. All rights reserved.
    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 /*
   29  * Driver for MacIO GPIO controller
   30  */
   31 
   32 #include <sys/param.h>
   33 #include <sys/systm.h>
   34 #include <sys/kernel.h>
   35 #include <sys/malloc.h>
   36 #include <sys/module.h>
   37 #include <sys/bus.h>
   38 #include <sys/rman.h>
   39 
   40 #include <vm/vm.h>
   41 #include <vm/pmap.h>
   42 
   43 #include <machine/bus.h>
   44 #include <machine/intr_machdep.h>
   45 #include <machine/pmap.h>
   46 #include <machine/resource.h>
   47 #include <machine/vmparam.h>
   48 
   49 #include <dev/ofw/ofw_bus.h>
   50 #include <dev/ofw/ofw_bus_subr.h>
   51 #include <dev/ofw/openfirm.h>
   52 
   53 #include <powerpc/powermac/macgpiovar.h>
   54 
   55 /*
   56  * Macgpio softc
   57  */
   58 struct macgpio_softc {
   59         phandle_t       sc_node;
   60         struct resource *sc_gpios;
   61         int             sc_gpios_rid;
   62 };
   63 
   64 static MALLOC_DEFINE(M_MACGPIO, "macgpio", "macgpio device information");
   65 
   66 static int      macgpio_probe(device_t);
   67 static int      macgpio_attach(device_t);
   68 static int      macgpio_print_child(device_t dev, device_t child);
   69 static void     macgpio_probe_nomatch(device_t, device_t);
   70 static struct resource *macgpio_alloc_resource(device_t, device_t, int, int *,
   71                     u_long, u_long, u_long, u_int);
   72 static int      macgpio_activate_resource(device_t, device_t, int, int,
   73                     struct resource *);
   74 static int      macgpio_deactivate_resource(device_t, device_t, int, int,
   75                     struct resource *);
   76 static ofw_bus_get_devinfo_t macgpio_get_devinfo;
   77 
   78 /*
   79  * Bus interface definition
   80  */
   81 static device_method_t macgpio_methods[] = {
   82         /* Device interface */
   83         DEVMETHOD(device_probe,         macgpio_probe),
   84         DEVMETHOD(device_attach,        macgpio_attach),
   85         DEVMETHOD(device_detach,        bus_generic_detach),
   86         DEVMETHOD(device_shutdown,      bus_generic_shutdown),
   87         DEVMETHOD(device_suspend,       bus_generic_suspend),
   88         DEVMETHOD(device_resume,        bus_generic_resume),
   89         
   90         /* Bus interface */
   91         DEVMETHOD(bus_print_child,      macgpio_print_child),
   92         DEVMETHOD(bus_probe_nomatch,    macgpio_probe_nomatch),
   93         DEVMETHOD(bus_setup_intr,       bus_generic_setup_intr),
   94         DEVMETHOD(bus_teardown_intr,    bus_generic_teardown_intr),     
   95 
   96         DEVMETHOD(bus_alloc_resource,   macgpio_alloc_resource),
   97         DEVMETHOD(bus_activate_resource, macgpio_activate_resource),
   98         DEVMETHOD(bus_deactivate_resource, macgpio_deactivate_resource),
   99         DEVMETHOD(bus_release_resource, bus_generic_release_resource),
  100 
  101         DEVMETHOD(bus_child_pnpinfo_str, ofw_bus_gen_child_pnpinfo_str),
  102 
  103         /* ofw_bus interface */
  104         DEVMETHOD(ofw_bus_get_devinfo,  macgpio_get_devinfo),
  105         DEVMETHOD(ofw_bus_get_compat,   ofw_bus_gen_get_compat),
  106         DEVMETHOD(ofw_bus_get_model,    ofw_bus_gen_get_model),
  107         DEVMETHOD(ofw_bus_get_name,     ofw_bus_gen_get_name),
  108         DEVMETHOD(ofw_bus_get_node,     ofw_bus_gen_get_node),
  109         DEVMETHOD(ofw_bus_get_type,     ofw_bus_gen_get_type),
  110 
  111         { 0, 0 }
  112 };
  113 
  114 static driver_t macgpio_pci_driver = {
  115         "macgpio",
  116         macgpio_methods,
  117         sizeof(struct macgpio_softc)
  118 };
  119 
  120 devclass_t macgpio_devclass;
  121 
  122 DRIVER_MODULE(macgpio, macio, macgpio_pci_driver, macgpio_devclass, 0, 0);
  123 
  124 struct macgpio_devinfo {
  125         struct ofw_bus_devinfo mdi_obdinfo;
  126         struct resource_list mdi_resources;
  127 
  128         int gpio_num;
  129 };
  130 
  131 static int
  132 macgpio_probe(device_t dev)
  133 {
  134         const char *name;
  135 
  136         name = ofw_bus_get_name(dev);
  137         if (name && strcmp(name, "gpio") == 0) {
  138                 device_set_desc(dev, "MacIO GPIO Controller");
  139                 return (0);
  140         }
  141         
  142         return (ENXIO); 
  143 }
  144 
  145 /*
  146  * Scan Open Firmware child nodes, and attach these as children
  147  * of the macgpio bus
  148  */
  149 static int 
  150 macgpio_attach(device_t dev)
  151 {
  152         struct macgpio_softc *sc;
  153         struct macgpio_devinfo *dinfo;
  154         phandle_t root, child, iparent;
  155         device_t cdev;
  156         uint32_t irq;
  157 
  158         sc = device_get_softc(dev);
  159         root = sc->sc_node = ofw_bus_get_node(dev);
  160         
  161         sc->sc_gpios = bus_alloc_resource_any(dev, SYS_RES_MEMORY,
  162             &sc->sc_gpios_rid, RF_ACTIVE);
  163 
  164         /*
  165          * Iterate through the sub-devices
  166          */
  167         for (child = OF_child(root); child != 0; child = OF_peer(child)) {
  168                 dinfo = malloc(sizeof(*dinfo), M_MACGPIO, M_WAITOK | M_ZERO);
  169                 if (ofw_bus_gen_setup_devinfo(&dinfo->mdi_obdinfo, child) !=
  170                     0) {
  171                         free(dinfo, M_MACGPIO);
  172                         continue;
  173                 }
  174 
  175                 if (OF_getprop(child,"reg",&dinfo->gpio_num,
  176                     sizeof(dinfo->gpio_num)) != sizeof(dinfo->gpio_num)) {
  177                         /*
  178                          * Some early GPIO controllers don't provide GPIO
  179                          * numbers for GPIOs designed only to provide
  180                          * interrupt resources.  We should still allow these
  181                          * to attach, but with caution.
  182                          */
  183 
  184                         dinfo->gpio_num = -1;
  185                 }
  186 
  187                 resource_list_init(&dinfo->mdi_resources);
  188 
  189                 if (OF_getprop(child, "interrupts", &irq, sizeof(irq)) == 
  190                     sizeof(irq)) {
  191                         OF_searchprop(child, "interrupt-parent", &iparent,
  192                             sizeof(iparent));
  193                         resource_list_add(&dinfo->mdi_resources, SYS_RES_IRQ,
  194                             0, MAP_IRQ(iparent, irq), MAP_IRQ(iparent, irq),
  195                             1);
  196                 }
  197 
  198                 /* Fix messed-up offsets */
  199                 if (dinfo->gpio_num > 0x50)
  200                         dinfo->gpio_num -= 0x50;
  201 
  202                 cdev = device_add_child(dev, NULL, -1);
  203                 if (cdev == NULL) {
  204                         device_printf(dev, "<%s>: device_add_child failed\n",
  205                             dinfo->mdi_obdinfo.obd_name);
  206                         ofw_bus_gen_destroy_devinfo(&dinfo->mdi_obdinfo);
  207                         free(dinfo, M_MACGPIO);
  208                         continue;
  209                 }
  210                 device_set_ivars(cdev, dinfo);
  211         }
  212 
  213         return (bus_generic_attach(dev));
  214 }
  215 
  216 
  217 static int
  218 macgpio_print_child(device_t dev, device_t child)
  219 {
  220         struct macgpio_devinfo *dinfo;
  221         int retval = 0;
  222 
  223         dinfo = device_get_ivars(child);
  224 
  225         retval += bus_print_child_header(dev, child);
  226         
  227         if (dinfo->gpio_num >= GPIO_BASE)
  228                 printf(" gpio %d", dinfo->gpio_num - GPIO_BASE);
  229         else if (dinfo->gpio_num >= GPIO_EXTINT_BASE)
  230                 printf(" extint-gpio %d", dinfo->gpio_num - GPIO_EXTINT_BASE);
  231         else if (dinfo->gpio_num >= 0)
  232                 printf(" addr 0x%02x", dinfo->gpio_num); /* should not happen */
  233 
  234         resource_list_print_type(&dinfo->mdi_resources, "irq", SYS_RES_IRQ, 
  235             "%ld");
  236         retval += bus_print_child_footer(dev, child);
  237 
  238         return (retval);
  239 }
  240 
  241 
  242 static void
  243 macgpio_probe_nomatch(device_t dev, device_t child)
  244 {
  245         struct macgpio_devinfo *dinfo;
  246         const char *type;
  247 
  248         if (bootverbose) {
  249                 dinfo = device_get_ivars(child);
  250 
  251                 if ((type = ofw_bus_get_type(child)) == NULL)
  252                         type = "(unknown)";
  253                 device_printf(dev, "<%s, %s>", type, ofw_bus_get_name(child));
  254                 if (dinfo->gpio_num >= 0)
  255                         printf(" gpio %d",dinfo->gpio_num);
  256                 resource_list_print_type(&dinfo->mdi_resources, "irq", 
  257                     SYS_RES_IRQ, "%ld");
  258                 printf(" (no driver attached)\n");
  259         }
  260 }
  261 
  262 
  263 static struct resource *
  264 macgpio_alloc_resource(device_t bus, device_t child, int type, int *rid,
  265                      u_long start, u_long end, u_long count, u_int flags)
  266 {
  267         struct macgpio_devinfo *dinfo;
  268 
  269         dinfo = device_get_ivars(child);
  270 
  271         if (type != SYS_RES_IRQ)
  272                 return (NULL);
  273 
  274         return (resource_list_alloc(&dinfo->mdi_resources, bus, child, type, 
  275             rid, start, end, count, flags));
  276 }
  277 
  278 static int
  279 macgpio_activate_resource(device_t bus, device_t child, int type, int rid,
  280                            struct resource *res)
  281 {
  282         struct macgpio_softc *sc;
  283         struct macgpio_devinfo *dinfo;
  284         u_char val;
  285 
  286         sc = device_get_softc(bus);
  287         dinfo = device_get_ivars(child);
  288 
  289         if (type != SYS_RES_IRQ)
  290                 return ENXIO;
  291 
  292         if (dinfo->gpio_num >= 0) {
  293                 val = bus_read_1(sc->sc_gpios,dinfo->gpio_num);
  294                 val |= 0x80;
  295                 bus_write_1(sc->sc_gpios,dinfo->gpio_num,val);
  296         }
  297 
  298         return (bus_activate_resource(bus, type, rid, res));
  299 }
  300 
  301 
  302 static int
  303 macgpio_deactivate_resource(device_t bus, device_t child, int type, int rid,
  304                           struct resource *res)
  305 {
  306         struct macgpio_softc *sc;
  307         struct macgpio_devinfo *dinfo;
  308         u_char val;
  309 
  310         sc = device_get_softc(bus);
  311         dinfo = device_get_ivars(child);
  312 
  313         if (type != SYS_RES_IRQ)
  314                 return ENXIO;
  315 
  316         if (dinfo->gpio_num >= 0) {
  317                 val = bus_read_1(sc->sc_gpios,dinfo->gpio_num);
  318                 val &= ~0x80;
  319                 bus_write_1(sc->sc_gpios,dinfo->gpio_num,val);
  320         }
  321 
  322         return (bus_deactivate_resource(bus, type, rid, res));
  323 }
  324 
  325 uint8_t
  326 macgpio_read(device_t dev)
  327 {
  328         struct macgpio_softc *sc;
  329         struct macgpio_devinfo *dinfo;
  330 
  331         sc = device_get_softc(device_get_parent(dev));
  332         dinfo = device_get_ivars(dev);
  333 
  334         if (dinfo->gpio_num < 0)
  335                 return (0);
  336 
  337         return (bus_read_1(sc->sc_gpios,dinfo->gpio_num));
  338 }
  339 
  340 void
  341 macgpio_write(device_t dev, uint8_t val)
  342 {
  343         struct macgpio_softc *sc;
  344         struct macgpio_devinfo *dinfo;
  345 
  346         sc = device_get_softc(device_get_parent(dev));
  347         dinfo = device_get_ivars(dev);
  348 
  349         if (dinfo->gpio_num < 0)
  350                 return;
  351 
  352         bus_write_1(sc->sc_gpios,dinfo->gpio_num,val);
  353 }
  354 
  355 static const struct ofw_bus_devinfo *
  356 macgpio_get_devinfo(device_t dev, device_t child)
  357 {
  358         struct macgpio_devinfo *dinfo;
  359 
  360         dinfo = device_get_ivars(child);
  361         return (&dinfo->mdi_obdinfo);
  362 }
  363
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FreeBSD/Linux Kernel Cross Reference sys/powerpc/powermac/macgpio.c

FreeBSD/Linux Kernel Cross Reference
sys/powerpc/powermac/macgpio.c
