diff options
Diffstat (limited to 'kernel/drivers/net/wireless/brcm80211/brcmsmac/dma.h')
| -rw-r--r-- | kernel/drivers/net/wireless/brcm80211/brcmsmac/dma.h | 125 |
1 files changed, 125 insertions, 0 deletions
diff --git a/kernel/drivers/net/wireless/brcm80211/brcmsmac/dma.h b/kernel/drivers/net/wireless/brcm80211/brcmsmac/dma.h new file mode 100644 index 000000000..ff5b80b09 --- /dev/null +++ b/kernel/drivers/net/wireless/brcm80211/brcmsmac/dma.h @@ -0,0 +1,125 @@ +/* + * Copyright (c) 2010 Broadcom Corporation + * + * Permission to use, copy, modify, and/or distribute this software for any + * purpose with or without fee is hereby granted, provided that the above + * copyright notice and this permission notice appear in all copies. + * + * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES + * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF + * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY + * SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES + * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION + * OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN + * CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. + */ + +#ifndef _BRCM_DMA_H_ +#define _BRCM_DMA_H_ + +#include <linux/delay.h> +#include <linux/skbuff.h> +#include "types.h" /* forward structure declarations */ + +/* map/unmap direction */ +#define DMA_TX 1 /* TX direction for DMA */ +#define DMA_RX 2 /* RX direction for DMA */ + +/* DMA structure: + * support two DMA engines: 32 bits address or 64 bit addressing + * basic DMA register set is per channel(transmit or receive) + * a pair of channels is defined for convenience + */ + +/* 32 bits addressing */ + +struct dma32diag { /* diag access */ + u32 fifoaddr; /* diag address */ + u32 fifodatalow; /* low 32bits of data */ + u32 fifodatahigh; /* high 32bits of data */ + u32 pad; /* reserved */ +}; + +/* 64 bits addressing */ + +/* dma registers per channel(xmt or rcv) */ +struct dma64regs { + u32 control; /* enable, et al */ + u32 ptr; /* last descriptor posted to chip */ + u32 addrlow; /* desc ring base address low 32-bits (8K aligned) */ + u32 addrhigh; /* desc ring base address bits 63:32 (8K aligned) */ + u32 status0; /* current descriptor, xmt state */ + u32 status1; /* active descriptor, xmt error */ +}; + +/* range param for dma_getnexttxp() and dma_txreclaim */ +enum txd_range { + DMA_RANGE_ALL = 1, + DMA_RANGE_TRANSMITTED, + DMA_RANGE_TRANSFERED +}; + +/* + * Exported data structure (read-only) + */ +/* export structure */ +struct dma_pub { + uint txavail; /* # free tx descriptors */ + uint dmactrlflags; /* dma control flags */ + + /* rx error counters */ + uint rxgiants; /* rx giant frames */ + uint rxnobuf; /* rx out of dma descriptors */ + /* tx error counters */ + uint txnobuf; /* tx out of dma descriptors */ +}; + +extern struct dma_pub *dma_attach(char *name, struct brcms_c_info *wlc, + uint txregbase, uint rxregbase, + uint ntxd, uint nrxd, + uint rxbufsize, int rxextheadroom, + uint nrxpost, uint rxoffset); + +void dma_rxinit(struct dma_pub *pub); +int dma_rx(struct dma_pub *pub, struct sk_buff_head *skb_list); +bool dma_rxfill(struct dma_pub *pub); +bool dma_rxreset(struct dma_pub *pub); +bool dma_txreset(struct dma_pub *pub); +void dma_txinit(struct dma_pub *pub); +int dma_txfast(struct brcms_c_info *wlc, struct dma_pub *pub, + struct sk_buff *p0); +void dma_txflush(struct dma_pub *pub); +int dma_txpending(struct dma_pub *pub); +void dma_kick_tx(struct dma_pub *pub); +void dma_txsuspend(struct dma_pub *pub); +bool dma_txsuspended(struct dma_pub *pub); +void dma_txresume(struct dma_pub *pub); +void dma_txreclaim(struct dma_pub *pub, enum txd_range range); +void dma_rxreclaim(struct dma_pub *pub); +void dma_detach(struct dma_pub *pub); +unsigned long dma_getvar(struct dma_pub *pub, const char *name); +struct sk_buff *dma_getnexttxp(struct dma_pub *pub, enum txd_range range); +void dma_counterreset(struct dma_pub *pub); + +void dma_walk_packets(struct dma_pub *dmah, void (*callback_fnc) + (void *pkt, void *arg_a), void *arg_a); + +/* + * DMA(Bug) on bcm47xx chips seems to declare that the packet is ready, but + * the packet length is not updated yet (by DMA) on the expected time. + * Workaround is to hold processor till DMA updates the length, and stay off + * the bus to allow DMA update the length in buffer + */ +static inline void dma_spin_for_len(uint len, struct sk_buff *head) +{ +#if defined(CONFIG_BCM47XX) + if (!len) { + while (!(len = *(u16 *) KSEG1ADDR(head->data))) + udelay(1); + + *(u16 *) (head->data) = cpu_to_le16((u16) len); + } +#endif /* defined(CONFIG_BCM47XX) */ +} + +#endif /* _BRCM_DMA_H_ */ |