FreeBSD/Linux Kernel Cross Reference
sys/arm/ti/ti_prm.c

     /*-
      * Copyright (c) 2020 Oskar Holmlund <oskar.holmlund@ohdata.se>
      *
      * 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.
     *
     * $FreeBSD$
     */
    /*
     * Power management - simple driver to handle reset and give access to
     * memory space region for other drivers through prcm driver.
     * Documentation/devicetree/binding/arm/omap/prm-inst.txt
     */
    
    #include <sys/cdefs.h>
    __FBSDID("$FreeBSD$");
    
    #include <sys/param.h>
    #include <sys/systm.h>
    #include <sys/kernel.h>
    #include <sys/module.h>
    
    #include <dev/fdt/simplebus.h>
    
    #include <dev/ofw/ofw_bus_subr.h>
    
    #include <arm/ti/ti_prcm.h>
    #include <arm/ti/ti_prm.h>
    
    #if 0
    #define DPRINTF(dev, msg...) device_printf(dev, msg)
    #else
    #define DPRINTF(dev, msg...)
    #endif
    
    /* relative to prcm address range */
    #define TI_PRM_PER_RSTCTRL      0xC00
    
    struct ti_prm_softc {
            device_t                dev;
            uint8_t                 type;
            bool                    has_reset;
    };
    
    /* Device */
    #define TI_OMAP_PRM_INST        10
    
    #define TI_AM3_PRM_INST         5
    #define TI_AM4_PRM_INST         4
    #define TI_OMAP4_PRM_INST       3
    #define TI_OMAP5_PRM_INST       2
    #define TI_DRA7_PRM_INST        1
    #define TI_END                  0
    
    static struct ofw_compat_data compat_data[] = {
            { "ti,am3-prm-inst",    TI_AM3_PRM_INST },
            { "ti,am4-prm-inst",    TI_AM4_PRM_INST },
            { "ti,omap4-prm-inst",  TI_OMAP4_PRM_INST },
            { "ti,omap5-prm-inst",  TI_OMAP5_PRM_INST },
            { "ti,dra7-prm-inst",   TI_DRA7_PRM_INST },
            { NULL,         TI_END }
    };
    
    static struct ofw_compat_data required_data[] = {
            { "ti,omap-prm-inst", TI_OMAP_PRM_INST },
            { NULL, TI_END }
    };
    
    /* device interface */
    static int
    ti_prm_probe(device_t dev)
    {
            if (!ofw_bus_status_okay(dev))
                    return (ENXIO);
    
            if (ofw_bus_search_compatible(dev, required_data)->ocd_data == 0)
                    return (ENXIO);
    
            if (ofw_bus_search_compatible(dev, compat_data)->ocd_data == 0)
                    return (ENXIO);
    
           device_set_desc(dev, "TI OMAP Power Management");
           return(BUS_PROBE_DEFAULT);
   }
   
   static int
   ti_prm_attach(device_t dev)
   {
           struct ti_prm_softc *sc;
           phandle_t node;
   
           sc = device_get_softc(dev);
           sc->dev = dev;
           sc->type = ofw_bus_search_compatible(dev, compat_data)->ocd_data;
   
           node = ofw_bus_get_node(sc->dev);
   
           if (OF_hasprop(node, "#reset-cells")) {
                   sc->has_reset = true;
           } else
                   sc->has_reset = false;
   
           /* Make device visible for other drivers */
           OF_device_register_xref(OF_xref_from_node(node), sc->dev);
   
           return (0);
   }
   
   static int
   ti_prm_detach(device_t dev) {
           return (EBUSY);
   }
   
   int
   ti_prm_reset(device_t dev)
   {
           struct ti_prm_softc *sc;
           int err;
   
           sc = device_get_softc(dev);
           if (sc->has_reset == false)
                   return 1;
   
           err = ti_prm_modify_4(dev, TI_PRM_PER_RSTCTRL, 0x2, 0x00);
           return (err);
   }
   
   int
   ti_prm_write_4(device_t dev, bus_addr_t addr, uint32_t val)
   {
           struct ti_prm_softc *sc;
           device_t parent;
   
           parent = device_get_parent(dev);
           sc = device_get_softc(dev);
           DPRINTF(sc->dev, "offset=%lx write %x\n", addr, val);
           ti_prcm_device_lock(parent);
           ti_prcm_write_4(parent, addr, val);
           ti_prcm_device_unlock(parent);
           return (0);
   }
   
   int
   ti_prm_read_4(device_t dev, bus_addr_t addr, uint32_t *val)
   {
           struct ti_prm_softc *sc;
           device_t parent;
   
           parent = device_get_parent(dev);
           sc = device_get_softc(dev);
   
           ti_prcm_device_lock(parent);
           ti_prcm_read_4(parent, addr, val);
           ti_prcm_device_unlock(parent);
           DPRINTF(sc->dev, "offset=%lx Read %x\n", addr, *val);
           return (0);
   }
   
   int
   ti_prm_modify_4(device_t dev, bus_addr_t addr, uint32_t clr, uint32_t set)
   {
           struct ti_prm_softc *sc;
           device_t parent;
   
           parent = device_get_parent(dev);
           sc = device_get_softc(dev);
   
           ti_prcm_device_lock(parent);
           ti_prcm_modify_4(parent, addr, clr, set);
           ti_prcm_device_unlock(parent);
           DPRINTF(sc->dev, "offset=%lx (clr %x set %x)\n", addr, clr, set);
   
           return (0);
   }
   
   static device_method_t ti_prm_methods[] = {
           DEVMETHOD(device_probe,         ti_prm_probe),
           DEVMETHOD(device_attach,        ti_prm_attach),
           DEVMETHOD(device_detach,        ti_prm_detach),
   
           DEVMETHOD_END
   };
   
   DEFINE_CLASS_1(ti_prm, ti_prm_driver, ti_prm_methods,
       sizeof(struct ti_prm_softc), simplebus_driver);
   
   static devclass_t ti_prm_devclass;
   
   EARLY_DRIVER_MODULE(ti_prm, simplebus, ti_prm_driver,
       ti_prm_devclass, 0, 0, BUS_PASS_BUS + BUS_PASS_ORDER_MIDDLE);
   MODULE_VERSION(ti_prm, 1);
   MODULE_DEPEND(ti_prm, ti_sysc, 1, 1, 1);

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