drivers/net/wireless/broadcom/b43/pio.c

Source file repositories/reference/linux-study-clean/drivers/net/wireless/broadcom/b43/pio.c

File Facts

System
Linux kernel
Corpus path
drivers/net/wireless/broadcom/b43/pio.c
Extension
.c
Size
20029 bytes
Lines
822
Domain
Driver Families
Bucket
drivers/net
Inferred role
Driver Families: implementation source
Status
source implementation candidate

Why This File Exists

Repeatable hardware-adapter layer. Deep compatibility for every driver is out of scope; this atlas records patterns, probe lifecycles, bus glue, IRQ/DMA usage, and links back to core abstractions.

Dependency Surface

Detected Declarations

Annotated Snippet

if (pack->skb) {
			ieee80211_free_txskb(q->dev->wl->hw, pack->skb);
			pack->skb = NULL;
		}
	}
}

static void b43_destroy_pioqueue_tx(struct b43_pio_txqueue *q,
				    const char *name)
{
	if (!q)
		return;
	b43_pio_cancel_tx_packets(q);
	kfree(q);
}

static void b43_destroy_pioqueue_rx(struct b43_pio_rxqueue *q,
				    const char *name)
{
	if (!q)
		return;
	kfree(q);
}

#define destroy_queue_tx(pio, queue) do {				\
	b43_destroy_pioqueue_tx((pio)->queue, __stringify(queue));	\
	(pio)->queue = NULL;						\
  } while (0)

#define destroy_queue_rx(pio, queue) do {				\
	b43_destroy_pioqueue_rx((pio)->queue, __stringify(queue));	\
	(pio)->queue = NULL;						\
  } while (0)

void b43_pio_free(struct b43_wldev *dev)
{
	struct b43_pio *pio;

	if (!b43_using_pio_transfers(dev))
		return;
	pio = &dev->pio;

	destroy_queue_rx(pio, rx_queue);
	destroy_queue_tx(pio, tx_queue_mcast);
	destroy_queue_tx(pio, tx_queue_AC_VO);
	destroy_queue_tx(pio, tx_queue_AC_VI);
	destroy_queue_tx(pio, tx_queue_AC_BE);
	destroy_queue_tx(pio, tx_queue_AC_BK);
}

int b43_pio_init(struct b43_wldev *dev)
{
	struct b43_pio *pio = &dev->pio;
	int err = -ENOMEM;

	b43_write32(dev, B43_MMIO_MACCTL, b43_read32(dev, B43_MMIO_MACCTL)
		    & ~B43_MACCTL_BE);
	b43_shm_write16(dev, B43_SHM_SHARED, B43_SHM_SH_RXPADOFF, 0);

	pio->tx_queue_AC_BK = b43_setup_pioqueue_tx(dev, 0);
	if (!pio->tx_queue_AC_BK)
		goto out;

	pio->tx_queue_AC_BE = b43_setup_pioqueue_tx(dev, 1);
	if (!pio->tx_queue_AC_BE)
		goto err_destroy_bk;

	pio->tx_queue_AC_VI = b43_setup_pioqueue_tx(dev, 2);
	if (!pio->tx_queue_AC_VI)
		goto err_destroy_be;

	pio->tx_queue_AC_VO = b43_setup_pioqueue_tx(dev, 3);
	if (!pio->tx_queue_AC_VO)
		goto err_destroy_vi;

	pio->tx_queue_mcast = b43_setup_pioqueue_tx(dev, 4);
	if (!pio->tx_queue_mcast)
		goto err_destroy_vo;

	pio->rx_queue = b43_setup_pioqueue_rx(dev, 0);
	if (!pio->rx_queue)
		goto err_destroy_mcast;

	b43dbg(dev->wl, "PIO initialized\n");
	err = 0;
out:
	return err;

err_destroy_mcast:
	destroy_queue_tx(pio, tx_queue_mcast);

Annotation

Implementation Notes