main.c

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/*
 * Broadcom specific AMBA
 * Bus subsystem
 *
 * Licensed under the GNU/GPL. See COPYING for details.
 */

#include "bcma_private.h"
#include <linux/module.h>
#include <linux/platform_device.h>
#include <linux/bcma/bcma.h>
#include <linux/slab.h>

MODULE_DESCRIPTION("Broadcom's specific AMBA driver");
MODULE_LICENSE("GPL");

/* contains the number the next bus should get. */
static unsigned int bcma_bus_next_num = 0;

/* bcma_buses_mutex locks the bcma_bus_next_num */
static DEFINE_MUTEX(bcma_buses_mutex);

static int bcma_bus_match(struct device *dev, struct device_driver *drv);
static int bcma_device_probe(struct device *dev);
static int bcma_device_remove(struct device *dev);
static int bcma_device_uevent(struct device *dev, struct kobj_uevent_env *env);

static ssize_t manuf_show(struct device *dev, struct device_attribute *attr, char *buf)
{
    struct bcma_device *core = container_of(dev, struct bcma_device, dev);
    return sprintf(buf, "0x%03X\n", core->id.manuf);
}
static ssize_t id_show(struct device *dev, struct device_attribute *attr, char *buf)
{
    struct bcma_device *core = container_of(dev, struct bcma_device, dev);
    return sprintf(buf, "0x%03X\n", core->id.id);
}
static ssize_t rev_show(struct device *dev, struct device_attribute *attr, char *buf)
{
    struct bcma_device *core = container_of(dev, struct bcma_device, dev);
    return sprintf(buf, "0x%02X\n", core->id.rev);
}
static ssize_t class_show(struct device *dev, struct device_attribute *attr, char *buf)
{
    struct bcma_device *core = container_of(dev, struct bcma_device, dev);
    return sprintf(buf, "0x%X\n", core->id.class);
}
static struct device_attribute bcma_device_attrs[] = {
    __ATTR_RO(manuf),
    __ATTR_RO(id),
    __ATTR_RO(rev),
    __ATTR_RO(class),
    __ATTR_NULL,
};

static struct bus_type bcma_bus_type = {
    .name       = "bcma",
    .match      = bcma_bus_match,
    .probe      = bcma_device_probe,
    .remove     = bcma_device_remove,
    .uevent     = bcma_device_uevent,
    .dev_attrs  = bcma_device_attrs,
};

static u16 bcma_cc_core_id(struct bcma_bus *bus)
{
    if (bus->chipinfo.id == BCMA_CHIP_ID_BCM4706)
        return BCMA_CORE_4706_CHIPCOMMON;
    return BCMA_CORE_CHIPCOMMON;
}

struct bcma_device *bcma_find_core(struct bcma_bus *bus, u16 coreid)
{
    struct bcma_device *core;

    list_for_each_entry(core, &bus->cores, list) {
        if (core->id.id == coreid)
            return core;
    }
    return NULL;
}
EXPORT_SYMBOL_GPL(bcma_find_core);

static void bcma_release_core_dev(struct device *dev)
{
    struct bcma_device *core = container_of(dev, struct bcma_device, dev);
    if (core->io_addr)
        iounmap(core->io_addr);
    if (core->io_wrap)
        iounmap(core->io_wrap);
    kfree(core);
}

static int bcma_register_cores(struct bcma_bus *bus)
{
    struct bcma_device *core;
    int err, dev_id = 0;

    list_for_each_entry(core, &bus->cores, list) {
        /* We support that cores ourself */
        switch (core->id.id) {
        case BCMA_CORE_4706_CHIPCOMMON:
        case BCMA_CORE_CHIPCOMMON:
        case BCMA_CORE_PCI:
        case BCMA_CORE_PCIE:
        case BCMA_CORE_MIPS_74K:
        case BCMA_CORE_4706_MAC_GBIT_COMMON:
            continue;
        }

        core->dev.release = bcma_release_core_dev;
        core->dev.bus = &bcma_bus_type;
        dev_set_name(&core->dev, "bcma%d:%d", bus->num, dev_id);

        switch (bus->hosttype) {
        case BCMA_HOSTTYPE_PCI:
            core->dev.parent = &bus->host_pci->dev;
            core->dma_dev = &bus->host_pci->dev;
            core->irq = bus->host_pci->irq;
            break;
        case BCMA_HOSTTYPE_SOC:
            core->dev.dma_mask = &core->dev.coherent_dma_mask;
            core->dma_dev = &core->dev;
            break;
        case BCMA_HOSTTYPE_SDIO:
            break;
        }

        err = device_register(&core->dev);
        if (err) {
            bcma_err(bus,
                 "Could not register dev for core 0x%03X\n",
                 core->id.id);
            continue;
        }
        core->dev_registered = true;
        dev_id++;
    }

#ifdef CONFIG_BCMA_SFLASH
    if (bus->drv_cc.sflash.present) {
        err = platform_device_register(&bcma_sflash_dev);
        if (err)
            bcma_err(bus, "Error registering serial flash\n");
    }
#endif

#ifdef CONFIG_BCMA_NFLASH
    if (bus->drv_cc.nflash.present) {
        err = platform_device_register(&bcma_nflash_dev);
        if (err)
            bcma_err(bus, "Error registering NAND flash\n");
    }
#endif

    return 0;
}

static void bcma_unregister_cores(struct bcma_bus *bus)
{
    struct bcma_device *core, *tmp;

    list_for_each_entry_safe(core, tmp, &bus->cores, list) {
        list_del(&core->list);
        if (core->dev_registered)
            device_unregister(&core->dev);
    }
}

int __devinit bcma_bus_register(struct bcma_bus *bus)
{
    int err;
    struct bcma_device *core;

    mutex_lock(&bcma_buses_mutex);
    bus->num = bcma_bus_next_num++;
    mutex_unlock(&bcma_buses_mutex);

    /* Scan for devices (cores) */
    err = bcma_bus_scan(bus);
    if (err) {
        bcma_err(bus, "Failed to scan: %d\n", err);
        return -1;
    }

    /* Init CC core */
    core = bcma_find_core(bus, bcma_cc_core_id(bus));
    if (core) {
        bus->drv_cc.core = core;
        bcma_core_chipcommon_init(&bus->drv_cc);
    }

    /* Init MIPS core */
    core = bcma_find_core(bus, BCMA_CORE_MIPS_74K);
    if (core) {
        bus->drv_mips.core = core;
        bcma_core_mips_init(&bus->drv_mips);
    }

    /* Init PCIE core */
    core = bcma_find_core(bus, BCMA_CORE_PCIE);
    if (core) {
        bus->drv_pci.core = core;
        bcma_core_pci_init(&bus->drv_pci);
    }

    /* Init GBIT MAC COMMON core */
    core = bcma_find_core(bus, BCMA_CORE_4706_MAC_GBIT_COMMON);
    if (core) {
        bus->drv_gmac_cmn.core = core;
        bcma_core_gmac_cmn_init(&bus->drv_gmac_cmn);
    }

    /* Try to get SPROM */
    err = bcma_sprom_get(bus);
    if (err == -ENOENT) {
        bcma_err(bus, "No SPROM available\n");
    } else if (err)
        bcma_err(bus, "Failed to get SPROM: %d\n", err);

    /* Register found cores */
    bcma_register_cores(bus);

    bcma_info(bus, "Bus registered\n");

    return 0;
}

void bcma_bus_unregister(struct bcma_bus *bus)
{
    struct bcma_device *cores[3];

    cores[0] = bcma_find_core(bus, BCMA_CORE_MIPS_74K);
    cores[1] = bcma_find_core(bus, BCMA_CORE_PCIE);
    cores[2] = bcma_find_core(bus, BCMA_CORE_4706_MAC_GBIT_COMMON);

    bcma_unregister_cores(bus);

    kfree(cores[2]);
    kfree(cores[1]);
    kfree(cores[0]);
}

int __init bcma_bus_early_register(struct bcma_bus *bus,
                   struct bcma_device *core_cc,
                   struct bcma_device *core_mips)
{
    int err;
    struct bcma_device *core;
    struct bcma_device_id match;

    bcma_init_bus(bus);

    match.manuf = BCMA_MANUF_BCM;
    match.id = bcma_cc_core_id(bus);
    match.class = BCMA_CL_SIM;
    match.rev = BCMA_ANY_REV;

    /* Scan for chip common core */
    err = bcma_bus_scan_early(bus, &match, core_cc);
    if (err) {
        bcma_err(bus, "Failed to scan for common core: %d\n", err);
        return -1;
    }

    match.manuf = BCMA_MANUF_MIPS;
    match.id = BCMA_CORE_MIPS_74K;
    match.class = BCMA_CL_SIM;
    match.rev = BCMA_ANY_REV;

    /* Scan for mips core */
    err = bcma_bus_scan_early(bus, &match, core_mips);
    if (err) {
        bcma_err(bus, "Failed to scan for mips core: %d\n", err);
        return -1;
    }

    /* Init CC core */
    core = bcma_find_core(bus, bcma_cc_core_id(bus));
    if (core) {
        bus->drv_cc.core = core;
        bcma_core_chipcommon_init(&bus->drv_cc);
    }

    /* Init MIPS core */
    core = bcma_find_core(bus, BCMA_CORE_MIPS_74K);
    if (core) {
        bus->drv_mips.core = core;
        bcma_core_mips_init(&bus->drv_mips);
    }

    bcma_info(bus, "Early bus registered\n");

    return 0;
}

#ifdef CONFIG_PM
int bcma_bus_suspend(struct bcma_bus *bus)
{
    struct bcma_device *core;

    list_for_each_entry(core, &bus->cores, list) {
        struct device_driver *drv = core->dev.driver;
        if (drv) {
            struct bcma_driver *adrv = container_of(drv, struct bcma_driver, drv);
            if (adrv->suspend)
                adrv->suspend(core);
        }
    }
    return 0;
}

int bcma_bus_resume(struct bcma_bus *bus)
{
    struct bcma_device *core;

    /* Init CC core */
    if (bus->drv_cc.core) {
        bus->drv_cc.setup_done = false;
        bcma_core_chipcommon_init(&bus->drv_cc);
    }

    list_for_each_entry(core, &bus->cores, list) {
        struct device_driver *drv = core->dev.driver;
        if (drv) {
            struct bcma_driver *adrv = container_of(drv, struct bcma_driver, drv);
            if (adrv->resume)
                adrv->resume(core);
        }
    }

    return 0;
}
#endif

int __bcma_driver_register(struct bcma_driver *drv, struct module *owner)
{
    drv->drv.name = drv->name;
    drv->drv.bus = &bcma_bus_type;
    drv->drv.owner = owner;

    return driver_register(&drv->drv);
}
EXPORT_SYMBOL_GPL(__bcma_driver_register);

void bcma_driver_unregister(struct bcma_driver *drv)
{
    driver_unregister(&drv->drv);
}
EXPORT_SYMBOL_GPL(bcma_driver_unregister);

static int bcma_bus_match(struct device *dev, struct device_driver *drv)
{
    struct bcma_device *core = container_of(dev, struct bcma_device, dev);
    struct bcma_driver *adrv = container_of(drv, struct bcma_driver, drv);
    const struct bcma_device_id *cid = &core->id;
    const struct bcma_device_id *did;

    for (did = adrv->id_table; did->manuf || did->id || did->rev; did++) {
        if ((did->manuf == cid->manuf || did->manuf == BCMA_ANY_MANUF) &&
        (did->id == cid->id || did->id == BCMA_ANY_ID) &&
        (did->rev == cid->rev || did->rev == BCMA_ANY_REV) &&
        (did->class == cid->class || did->class == BCMA_ANY_CLASS))
            return 1;
    }
    return 0;
}

static int bcma_device_probe(struct device *dev)
{
    struct bcma_device *core = container_of(dev, struct bcma_device, dev);
    struct bcma_driver *adrv = container_of(dev->driver, struct bcma_driver,
                           drv);
    int err = 0;

    if (adrv->probe)
        err = adrv->probe(core);

    return err;
}

static int bcma_device_remove(struct device *dev)
{
    struct bcma_device *core = container_of(dev, struct bcma_device, dev);
    struct bcma_driver *adrv = container_of(dev->driver, struct bcma_driver,
                           drv);

    if (adrv->remove)
        adrv->remove(core);

    return 0;
}

static int bcma_device_uevent(struct device *dev, struct kobj_uevent_env *env)
{
    struct bcma_device *core = container_of(dev, struct bcma_device, dev);

    return add_uevent_var(env,
                  "MODALIAS=bcma:m%04Xid%04Xrev%02Xcl%02X",
                  core->id.manuf, core->id.id,
                  core->id.rev, core->id.class);
}

static int __init bcma_modinit(void)
{
    int err;

    err = bus_register(&bcma_bus_type);
    if (err)
        return err;

#ifdef CONFIG_BCMA_HOST_PCI
    err = bcma_host_pci_init();
    if (err) {
        pr_err("PCI host initialization failed\n");
        err = 0;
    }
#endif

    return err;
}
fs_initcall(bcma_modinit);

static void __exit bcma_modexit(void)
{
#ifdef CONFIG_BCMA_HOST_PCI
    bcma_host_pci_exit();
#endif
    bus_unregister(&bcma_bus_type);
}
module_exit(bcma_modexit)