OpenWrt – Rev 1
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/*
* wl_glue.c: Broadcom WL support module providing a unified SSB/BCMA handling.
* Copyright (C) 2011 Jo-Philipp Wich <jo@mein.io>
*/
#include "wl_glue.h"
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/init.h>
#ifdef CONFIG_BCM47XX
#include <bcm47xx.h>
#endif
#ifdef CONFIG_SSB
#include <linux/ssb/ssb.h>
#endif
#ifdef CONFIG_BCMA
#include <linux/bcma/bcma.h>
#endif
MODULE_AUTHOR("Jo-Philipp Wich (jo@mein.io)");
MODULE_DESCRIPTION("Broadcom WL SSB/BCMA compatibility layer");
MODULE_LICENSE("GPL");
static wl_glue_attach_cb_t attach_cb = NULL;
static wl_glue_remove_cb_t remove_cb = NULL;
static enum wl_glue_bus_type active_bus_type = WL_GLUE_BUS_TYPE_UNSPEC;
static int wl_glue_attached = 0;
#ifdef CONFIG_SSB
static int wl_glue_ssb_probe(struct ssb_device *dev, const struct ssb_device_id *id)
{
void *mmio;
void *wldev;
if (!attach_cb)
{
pr_err("No attach callback registered\n");
return -ENOSYS;
}
if (dev->bus->bustype != SSB_BUSTYPE_SSB)
{
pr_err("Attaching to SSB behind PCI is not supported. Please remove the b43 ssb bridge\n");
return -EINVAL;
}
mmio = (void *) 0x18000000 + dev->core_index * 0x1000;
wldev = attach_cb(id->vendor, id->coreid, (ulong)mmio, dev, dev->irq);
if (!wldev)
{
pr_err("The attach callback failed, SSB probe aborted\n");
return -ENODEV;
}
ssb_set_drvdata(dev, wldev);
return 0;
}
static void wl_glue_ssb_remove(struct ssb_device *dev)
{
void *wldev = ssb_get_drvdata(dev);
if (remove_cb)
remove_cb(wldev);
ssb_set_drvdata(dev, NULL);
}
static const struct ssb_device_id wl_glue_ssb_tbl[] = {
SSB_DEVICE(SSB_VENDOR_BROADCOM, SSB_DEV_80211, SSB_ANY_REV),
{},
};
static struct ssb_driver wl_glue_ssb_driver = {
.name = KBUILD_MODNAME,
.id_table = wl_glue_ssb_tbl,
.probe = wl_glue_ssb_probe,
.remove = wl_glue_ssb_remove,
};
#endif /* CONFIG_SSB */
#ifdef CONFIG_BCMA
static int wl_glue_bcma_probe(struct bcma_device *dev)
{
void *wldev;
if (!attach_cb)
{
pr_err("No attach callback registered\n");
return -ENOSYS;
}
if (dev->bus->hosttype != BCMA_HOSTTYPE_SOC)
{
pr_err("Unsupported BCMA bus type %d\n", dev->bus->hosttype);
return -EINVAL;
}
/*
* NB:
* 0x18000000 = BCMA_ADDR_BASE
* 0x1000 = BCMA_CORE_SIZE
*/
wldev = attach_cb(dev->id.manuf, dev->id.id, (ulong)dev->addr, dev, dev->irq);
if (!wldev)
{
pr_err("The attach callback failed, BCMA probe aborted\n");
return -ENODEV;
}
bcma_set_drvdata(dev, wldev);
return 0;
}
static void wl_glue_bcma_remove(struct bcma_device *dev)
{
void *wldev = bcma_get_drvdata(dev);
if (remove_cb)
remove_cb(wldev);
bcma_set_drvdata(dev, NULL);
}
static const struct bcma_device_id wl_glue_bcma_tbl[] = {
BCMA_CORE(BCMA_MANUF_BCM, BCMA_CORE_80211, BCMA_ANY_REV, BCMA_ANY_CLASS),
{},
};
static struct bcma_driver wl_glue_bcma_driver = {
.name = KBUILD_MODNAME,
.id_table = wl_glue_bcma_tbl,
.probe = wl_glue_bcma_probe,
.remove = wl_glue_bcma_remove,
};
#endif /* CONFIG_BCMA */
void wl_glue_set_attach_callback(wl_glue_attach_cb_t cb)
{
attach_cb = cb;
}
EXPORT_SYMBOL(wl_glue_set_attach_callback);
void wl_glue_set_remove_callback(wl_glue_remove_cb_t cb)
{
remove_cb = cb;
}
EXPORT_SYMBOL(wl_glue_set_remove_callback);
int wl_glue_register(void)
{
int err;
switch(active_bus_type)
{
#ifdef CONFIG_SSB
case WL_GLUE_BUS_TYPE_SSB:
err = ssb_driver_register(&wl_glue_ssb_driver);
break;
#endif /* CONFIG_SSB */
#ifdef CONFIG_BCMA
case WL_GLUE_BUS_TYPE_BCMA:
err = bcma_driver_register(&wl_glue_bcma_driver);
break;
#endif /* CONFIG_BCMA */
default:
pr_err("Not attaching through glue driver due to unsupported bus\n");
err = -ENOSYS;
break;
}
if (!err)
{
pr_info("SSB/BCMA glue driver successfully attached\n");
wl_glue_attached = 1;
}
return err;
}
EXPORT_SYMBOL(wl_glue_register);
int wl_glue_unregister(void)
{
int err;
if (!wl_glue_attached)
return -ENOSYS;
switch (active_bus_type)
{
#ifdef CONFIG_SSB
case WL_GLUE_BUS_TYPE_SSB:
ssb_driver_unregister(&wl_glue_ssb_driver);
err = 0;
break;
#endif /* CONFIG_SSB */
#ifdef CONFIG_BCMA
case WL_GLUE_BUS_TYPE_BCMA:
bcma_driver_unregister(&wl_glue_bcma_driver);
err = 0;
break;
#endif /* CONFIG_BCMA */
default:
pr_err("Not removing glue driver due to unsupported bus\n");
err = -ENOSYS;
break;
}
if (!err)
{
pr_info("SSB/BCMA glue driver successfully detached\n");
wl_glue_attached = 0;
}
return err;
}
EXPORT_SYMBOL(wl_glue_unregister);
struct device * wl_glue_get_dmadev(void *dev)
{
struct device *dma_dev;
switch (active_bus_type)
{
#ifdef CONFIG_SSB
case WL_GLUE_BUS_TYPE_SSB:
dma_dev = ((struct ssb_device *)dev)->dma_dev;
break;
#endif /* CONFIG_SSB */
#ifdef CONFIG_BCMA
case WL_GLUE_BUS_TYPE_BCMA:
dma_dev = ((struct bcma_device *)dev)->dma_dev;
break;
#endif /* CONFIG_BCMA */
default:
BUG();
dma_dev = NULL;
break;
}
return dma_dev;
}
EXPORT_SYMBOL(wl_glue_get_dmadev);
static int __init wl_glue_init(void)
{
#ifdef CONFIG_BCM47XX
/*
* BCM47xx currently supports either SSB or BCMA bus,
* determine the used one from the info set by the
* platform setup code.
*/
switch (bcm47xx_bus_type)
{
#ifdef CONFIG_BCM47XX_SSB
case BCM47XX_BUS_TYPE_SSB:
active_bus_type = WL_GLUE_BUS_TYPE_SSB;
break;
#endif /* CONFIG_BCM47XX_SSB */
#ifdef CONFIG_BCM47XX_BCMA
case BCM47XX_BUS_TYPE_BCMA:
active_bus_type = WL_GLUE_BUS_TYPE_BCMA;
break;
#endif /* CONFIG_BCM47XX_BCMA */
}
#endif /* CONFIG_BCM47XX */
#ifdef CONFIG_BCM63XX
#ifdef CONFIG_SSB
/*
* BCM63xx currently only uses SSB, so assume that.
*/
active_bus_type = WL_GLUE_BUS_TYPE_SSB;
#endif /* CONFIG_SSB */
#endif /* CONFIG_BCM63XX */
/* do not fail here, let wl_glue_register() return -ENOSYS later */
if (active_bus_type == WL_GLUE_BUS_TYPE_UNSPEC)
pr_err("Unable to determine used system bus type\n");
return 0;
}
static void __exit wl_glue_exit(void)
{
if (wl_glue_attached)
{
if (wl_glue_unregister())
pr_err("Failed to unregister glue driver\n");
wl_glue_attached = 0;
}
return;
}
module_init(wl_glue_init);
module_exit(wl_glue_exit);