diff options
Diffstat (limited to 'drivers/net/wireless/broadcom/b43legacy/dma.h')
| -rw-r--r-- | drivers/net/wireless/broadcom/b43legacy/dma.h | 232 |
1 files changed, 232 insertions, 0 deletions
diff --git a/drivers/net/wireless/broadcom/b43legacy/dma.h b/drivers/net/wireless/broadcom/b43legacy/dma.h new file mode 100644 index 000000000..b5c1a51db --- /dev/null +++ b/drivers/net/wireless/broadcom/b43legacy/dma.h @@ -0,0 +1,232 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +#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_ */ |