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/*
* 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 si_pub *sih,
void __iomem *dmaregstx, void __iomem *dmaregsrx,
uint ntxd, uint nrxd,
uint rxbufsize, int rxextheadroom,
uint nrxpost, uint rxoffset, uint *msg_level);
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 dma_pub *pub, struct sk_buff *p0, bool commit);
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_ */
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