FreeBSD/Linux Kernel Cross Reference
sys/arm/at91/at91_cfata.c

     /*-
      * Copyright (c) 2008 Deglitch Networks, Stanislav Sedov
      * All rights reserved.
      *
      * Redistribution and use in source and binary forms, with or without
      * modification, are permitted provided that the following conditions
      * are met:
      * 1. Redistributions of source code must retain the above copyright
      *    notice, this list of conditions and the following disclaimer.
     * 2. Redistributions in binary form must reproduce the above copyright
     *    notice, this list of conditions and the following disclaimer in the
     *    documentation and/or other materials provided with the distribution.
     *
     * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
     * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
     * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
     * IN NO EVENT SHALL THE AUTHOR 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.
     *
     * Driver for the AT91RM9200 CompactFlash controller operating in a
     * common memory mode. Interrupts are driven by polling. The driver
     * implements an ATA bridge and attached ATA channel driver on top
     * of it.
     * NOTE WELL: this driver uses polling mode. To achive an acceptable
     * operating speed you will probably want to use HZ=2000 in kernel
     * config.
     */
    
    #include <sys/cdefs.h>
    __FBSDID("$FreeBSD: releng/9.0/sys/arm/at91/at91_cfata.c 193934 2009-06-10 17:39:19Z imp $");
    
    #include <sys/param.h>
    #include <sys/systm.h>
    #include <sys/kernel.h>
    #include <sys/module.h>
    #include <sys/time.h>
    #include <sys/bus.h>
    #include <sys/resource.h>
    #include <sys/rman.h>
    #include <sys/sema.h>
    #include <sys/taskqueue.h>
    #include <vm/uma.h>
    
    #include <machine/bus.h>
    #include <machine/cpu.h>
    #include <machine/cpufunc.h>
    #include <machine/resource.h>
    #include <machine/intr.h>
    
    #include <sys/ata.h>
    #include <dev/ata/ata-all.h>
    #include <ata_if.h>
    
    struct at91_cfata_softc {
            device_t                dev;
            struct resource         *mem_res;
            struct resource         irq;
            void                    (*isr_cb)(void *);
            void                    *isr_arg;
            struct callout          tick;
    };
    
    static int      at91_cfata_detach(device_t dev);
    static void     at91_cfata_callout(void *arg);
    
    static int
    at91_cfata_probe(device_t dev)
    {
    
            device_set_desc_copy(dev, "AT91RM9200 CompactFlash controller");
            return (0);
    }
    
    static int
    at91_cfata_attach(device_t dev)
    {
            struct at91_cfata_softc *sc;
            int rid, error;
    
            sc = device_get_softc(dev);
            sc->dev = dev;
            rid = 0;
            error = 0;
            sc->mem_res = bus_alloc_resource_any(dev, SYS_RES_MEMORY, &rid,
                RF_ACTIVE);
            if (sc->mem_res == NULL)
                    return (ENOMEM);
    
            /* XXX: init CF controller? */
    
            callout_init(&sc->tick, 1);     /* Callout to poll the device. */
            device_add_child(dev, "ata", -1);
            bus_generic_attach(dev);
            return (0);
   }
   
   static int
   at91_cfata_detach(device_t dev)
   {
           struct at91_cfata_softc *sc;
   
           sc = device_get_softc(dev);
           bus_generic_detach(sc->dev);
           if (sc->mem_res != NULL) {
                   bus_release_resource(dev, SYS_RES_MEMORY,
                       rman_get_rid(sc->mem_res), sc->mem_res);
                   sc->mem_res = NULL;
           }
           return (0);
   }
   
   static struct resource *
   ata_at91_alloc_resource(device_t dev, device_t child, int type, int *rid,
       u_long start, u_long end, u_long count, u_int flags)
   {
           struct at91_cfata_softc *sc = device_get_softc(dev);
   
           KASSERT(type == SYS_RES_IRQ && *rid == ATA_IRQ_RID,
               ("[at91_cfata, %d]: illegal resource request (type %u rid %u)",
               __LINE__, type, *rid));
           return (&sc->irq);
   }
   
   static int
   ata_at91_release_resource(device_t dev, device_t child, int type, int rid,
       struct resource *r)
   {
   
           KASSERT(type == SYS_RES_IRQ && rid == ATA_IRQ_RID,
               ("[at91_cfata, %d]: illegal resource request (type %u rid %u)",
               __LINE__, type, rid));
           return (0);
   }
   
   
   static int
   ata_at91_setup_intr(device_t dev, device_t child, struct resource *irq,
       int flags, driver_filter_t *filt,
       driver_intr_t *function, void *argument, void **cookiep)
   {
           struct at91_cfata_softc *sc = device_get_softc(dev);
   
           KASSERT(sc->isr_cb == NULL,
               ("[at91_cfata, %d]: overwriting the old handler", __LINE__));
           sc->isr_cb = function;
           sc->isr_arg = argument;
           *cookiep = sc;
           callout_reset(&sc->tick, 1, at91_cfata_callout, sc);
           return (0);
   }
   
   static int
   ata_at91_teardown_intr(device_t dev, device_t child, struct resource *irq,
       void *cookie)
   {
           struct at91_cfata_softc *sc = device_get_softc(dev);
   
           sc->isr_cb = NULL;
           sc->isr_arg = NULL;
           return (0);
   }
   
   static void
   at91_cfata_callout(void *arg)
   {
           struct at91_cfata_softc *sc;
   
           sc = (struct at91_cfata_softc *)arg;
           if (sc->isr_cb != NULL)
                   sc->isr_cb(sc->isr_arg);
           callout_reset(&sc->tick, 1, at91_cfata_callout, sc);
   }
   
   static int
   at91_channel_probe(device_t dev)
   {
           struct ata_channel *ch = device_get_softc(dev);
   
           ch->unit = 0;
           ch->flags |= ATA_USE_16BIT | ATA_NO_SLAVE;
           device_set_desc_copy(dev, "ATA channel 0");
   
           return (ata_probe(dev));
   }
   
   static int
   at91_channel_attach(device_t dev)
   {
           struct at91_cfata_softc *sc = device_get_softc(device_get_parent(dev));
           struct ata_channel *ch = device_get_softc(dev);
           int i;
   
           for (i = 0; i < ATA_MAX_RES; i++)
                   ch->r_io[i].res = sc->mem_res;
   
           /*
            * CF+ Specification.
            * 6.1.3 Memory Mapped Addressing.
            */
           ch->r_io[ATA_DATA].offset = 0x00;
           ch->r_io[ATA_FEATURE].offset = 0x01;
           ch->r_io[ATA_COUNT].offset = 0x02;
           ch->r_io[ATA_SECTOR].offset = 0x03;
           ch->r_io[ATA_CYL_LSB].offset = 0x04;
           ch->r_io[ATA_CYL_MSB].offset = 0x05;
           ch->r_io[ATA_DRIVE].offset = 0x06;
           ch->r_io[ATA_COMMAND].offset = 0x07;
           ch->r_io[ATA_ERROR].offset = 0x01;
           ch->r_io[ATA_IREASON].offset = 0x02;
           ch->r_io[ATA_STATUS].offset = 0x07;
           ch->r_io[ATA_ALTSTAT].offset = 0x0e;
           ch->r_io[ATA_CONTROL].offset = 0x0e;
   
           /* Should point at the base of registers. */
           ch->r_io[ATA_IDX_ADDR].offset = 0x0;
   
           ata_generic_hw(dev);
           return (ata_attach(dev));
   }
   
   static device_method_t at91_cfata_methods[] = {
           /* Device interface. */
           DEVMETHOD(device_probe,                 at91_cfata_probe),
           DEVMETHOD(device_attach,                at91_cfata_attach),
           DEVMETHOD(device_detach,                at91_cfata_detach),
           DEVMETHOD(device_shutdown,              bus_generic_shutdown),
           DEVMETHOD(device_suspend,               bus_generic_suspend),
           DEVMETHOD(device_resume,                bus_generic_resume),
   
           /* ATA bus methods. */
           DEVMETHOD(bus_alloc_resource,           ata_at91_alloc_resource),
           DEVMETHOD(bus_release_resource,         ata_at91_release_resource),
           DEVMETHOD(bus_activate_resource,        bus_generic_activate_resource),
           DEVMETHOD(bus_deactivate_resource,
               bus_generic_deactivate_resource),
           DEVMETHOD(bus_setup_intr,               ata_at91_setup_intr),
           DEVMETHOD(bus_teardown_intr,            ata_at91_teardown_intr),
   
           { 0, 0 }
   };
   
   devclass_t at91_cfata_devclass;
   
   static driver_t at91_cfata_driver = {
           "at91_cfata",
           at91_cfata_methods,
           sizeof(struct at91_cfata_softc),
   };
   
   DRIVER_MODULE(at91_cfata, atmelarm, at91_cfata_driver, at91_cfata_devclass, 0,
       0);
   MODULE_VERSION(at91_cfata, 1);
   MODULE_DEPEND(at91_cfata, ata, 1, 1, 1);
   
   /*
    * ATA channel driver.
    */
   static device_method_t at91_channel_methods[] = {
           /* device interface */
           DEVMETHOD(device_probe,         at91_channel_probe),
           DEVMETHOD(device_attach,        at91_channel_attach),
           DEVMETHOD(device_detach,        ata_detach),
           DEVMETHOD(device_shutdown,      bus_generic_shutdown),
           DEVMETHOD(device_suspend,       ata_suspend),
           DEVMETHOD(device_resume,        ata_resume),
   
           { 0, 0 }
   };
   
   driver_t at91_channel_driver = {
           "ata",
           at91_channel_methods,
           sizeof(struct ata_channel),
   };
   
   DRIVER_MODULE(ata, at91_cfata, at91_channel_driver, ata_devclass, 0, 0);

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