dma.h
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#ifndef B43legacy_DMA_H_
#define B43legacy_DMA_H_
#include <linux/list.h>
#include <linux/spinlock.h>
#include <linux/workqueue.h>
#include <linux/linkage.h>
#include <linux/atomic.h>
#include "b43legacy.h"
/* DMA-Interrupt reasons. */
#define B43legacy_DMAIRQ_FATALMASK ((1 << 10) | (1 << 11) | (1 << 12) \
| (1 << 14) | (1 << 15))
#define B43legacy_DMAIRQ_NONFATALMASK (1 << 13)
#define B43legacy_DMAIRQ_RX_DONE (1 << 16)
/*** 32-bit DMA Engine. ***/
/* 32-bit DMA controller registers. */
#define B43legacy_DMA32_TXCTL 0x00
#define B43legacy_DMA32_TXENABLE 0x00000001
#define B43legacy_DMA32_TXSUSPEND 0x00000002
#define B43legacy_DMA32_TXLOOPBACK 0x00000004
#define B43legacy_DMA32_TXFLUSH 0x00000010
#define B43legacy_DMA32_TXADDREXT_MASK 0x00030000
#define B43legacy_DMA32_TXADDREXT_SHIFT 16
#define B43legacy_DMA32_TXRING 0x04
#define B43legacy_DMA32_TXINDEX 0x08
#define B43legacy_DMA32_TXSTATUS 0x0C
#define B43legacy_DMA32_TXDPTR 0x00000FFF
#define B43legacy_DMA32_TXSTATE 0x0000F000
#define B43legacy_DMA32_TXSTAT_DISABLED 0x00000000
#define B43legacy_DMA32_TXSTAT_ACTIVE 0x00001000
#define B43legacy_DMA32_TXSTAT_IDLEWAIT 0x00002000
#define B43legacy_DMA32_TXSTAT_STOPPED 0x00003000
#define B43legacy_DMA32_TXSTAT_SUSP 0x00004000
#define B43legacy_DMA32_TXERROR 0x000F0000
#define B43legacy_DMA32_TXERR_NOERR 0x00000000
#define B43legacy_DMA32_TXERR_PROT 0x00010000
#define B43legacy_DMA32_TXERR_UNDERRUN 0x00020000
#define B43legacy_DMA32_TXERR_BUFREAD 0x00030000
#define B43legacy_DMA32_TXERR_DESCREAD 0x00040000
#define B43legacy_DMA32_TXACTIVE 0xFFF00000
#define B43legacy_DMA32_RXCTL 0x10
#define B43legacy_DMA32_RXENABLE 0x00000001
#define B43legacy_DMA32_RXFROFF_MASK 0x000000FE
#define B43legacy_DMA32_RXFROFF_SHIFT 1
#define B43legacy_DMA32_RXDIRECTFIFO 0x00000100
#define B43legacy_DMA32_RXADDREXT_MASK 0x00030000
#define B43legacy_DMA32_RXADDREXT_SHIFT 16
#define B43legacy_DMA32_RXRING 0x14
#define B43legacy_DMA32_RXINDEX 0x18
#define B43legacy_DMA32_RXSTATUS 0x1C
#define B43legacy_DMA32_RXDPTR 0x00000FFF
#define B43legacy_DMA32_RXSTATE 0x0000F000
#define B43legacy_DMA32_RXSTAT_DISABLED 0x00000000
#define B43legacy_DMA32_RXSTAT_ACTIVE 0x00001000
#define B43legacy_DMA32_RXSTAT_IDLEWAIT 0x00002000
#define B43legacy_DMA32_RXSTAT_STOPPED 0x00003000
#define B43legacy_DMA32_RXERROR 0x000F0000
#define B43legacy_DMA32_RXERR_NOERR 0x00000000
#define B43legacy_DMA32_RXERR_PROT 0x00010000
#define B43legacy_DMA32_RXERR_OVERFLOW 0x00020000
#define B43legacy_DMA32_RXERR_BUFWRITE 0x00030000
#define B43legacy_DMA32_RXERR_DESCREAD 0x00040000
#define B43legacy_DMA32_RXACTIVE 0xFFF00000
/* 32-bit DMA descriptor. */
struct b43legacy_dmadesc32 {
__le32 control;
__le32 address;
} __packed;
#define B43legacy_DMA32_DCTL_BYTECNT 0x00001FFF
#define B43legacy_DMA32_DCTL_ADDREXT_MASK 0x00030000
#define B43legacy_DMA32_DCTL_ADDREXT_SHIFT 16
#define B43legacy_DMA32_DCTL_DTABLEEND 0x10000000
#define B43legacy_DMA32_DCTL_IRQ 0x20000000
#define B43legacy_DMA32_DCTL_FRAMEEND 0x40000000
#define B43legacy_DMA32_DCTL_FRAMESTART 0x80000000
/* Misc DMA constants */
#define B43legacy_DMA_RINGMEMSIZE PAGE_SIZE
#define B43legacy_DMA0_RX_FRAMEOFFSET 30
#define B43legacy_DMA3_RX_FRAMEOFFSET 0
/* DMA engine tuning knobs */
#define B43legacy_TXRING_SLOTS 128
#define B43legacy_RXRING_SLOTS 64
#define B43legacy_DMA0_RX_BUFFERSIZE (2304 + 100)
#define B43legacy_DMA3_RX_BUFFERSIZE 16
#ifdef CONFIG_B43LEGACY_DMA
struct sk_buff;
struct b43legacy_private;
struct b43legacy_txstatus;
struct b43legacy_dmadesc_meta {
/* The kernel DMA-able buffer. */
struct sk_buff *skb;
/* DMA base bus-address of the descriptor buffer. */
dma_addr_t dmaaddr;
/* ieee80211 TX status. Only used once per 802.11 frag. */
bool is_last_fragment;
};
enum b43legacy_dmatype {
B43legacy_DMA_30BIT = 30,
B43legacy_DMA_32BIT = 32,
};
struct b43legacy_dmaring {
/* Kernel virtual base address of the ring memory. */
void *descbase;
/* Meta data about all descriptors. */
struct b43legacy_dmadesc_meta *meta;
/* Cache of TX headers for each slot.
* This is to avoid an allocation on each TX.
* This is NULL for an RX ring.
*/
u8 *txhdr_cache;
/* (Unadjusted) DMA base bus-address of the ring memory. */
dma_addr_t dmabase;
/* Number of descriptor slots in the ring. */
int nr_slots;
/* Number of used descriptor slots. */
int used_slots;
/* Currently used slot in the ring. */
int current_slot;
/* Frameoffset in octets. */
u32 frameoffset;
/* Descriptor buffer size. */
u16 rx_buffersize;
/* The MMIO base register of the DMA controller. */
u16 mmio_base;
/* DMA controller index number (0-5). */
int index;
/* Boolean. Is this a TX ring? */
bool tx;
/* The type of DMA engine used. */
enum b43legacy_dmatype type;
/* Boolean. Is this ring stopped at ieee80211 level? */
bool stopped;
/* The QOS priority assigned to this ring. Only used for TX rings.
* This is the mac80211 "queue" value. */
u8 queue_prio;
struct b43legacy_wldev *dev;
#ifdef CONFIG_B43LEGACY_DEBUG
/* Maximum number of used slots. */
int max_used_slots;
/* Last time we injected a ring overflow. */
unsigned long last_injected_overflow;
#endif /* CONFIG_B43LEGACY_DEBUG*/
};
static inline
u32 b43legacy_dma_read(struct b43legacy_dmaring *ring,
u16 offset)
{
return b43legacy_read32(ring->dev, ring->mmio_base + offset);
}
static inline
void b43legacy_dma_write(struct b43legacy_dmaring *ring,
u16 offset, u32 value)
{
b43legacy_write32(ring->dev, ring->mmio_base + offset, value);
}
int b43legacy_dma_init(struct b43legacy_wldev *dev);
void b43legacy_dma_free(struct b43legacy_wldev *dev);
void b43legacy_dma_tx_suspend(struct b43legacy_wldev *dev);
void b43legacy_dma_tx_resume(struct b43legacy_wldev *dev);
int b43legacy_dma_tx(struct b43legacy_wldev *dev,
struct sk_buff *skb);
void b43legacy_dma_handle_txstatus(struct b43legacy_wldev *dev,
const struct b43legacy_txstatus *status);
void b43legacy_dma_rx(struct b43legacy_dmaring *ring);
#else /* CONFIG_B43LEGACY_DMA */
static inline
int b43legacy_dma_init(struct b43legacy_wldev *dev)
{
return 0;
}
static inline
void b43legacy_dma_free(struct b43legacy_wldev *dev)
{
}
static inline
int b43legacy_dma_tx(struct b43legacy_wldev *dev,
struct sk_buff *skb)
{
return 0;
}
static inline
void b43legacy_dma_handle_txstatus(struct b43legacy_wldev *dev,
const struct b43legacy_txstatus *status)
{
}
static inline
void b43legacy_dma_rx(struct b43legacy_dmaring *ring)
{
}
static inline
void b43legacy_dma_tx_suspend(struct b43legacy_wldev *dev)
{
}
static inline
void b43legacy_dma_tx_resume(struct b43legacy_wldev *dev)
{
}
#endif /* CONFIG_B43LEGACY_DMA */
#endif /* B43legacy_DMA_H_ */