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/* Copyright (C) 2005-2006 by Texas Instruments */
#ifndef _CPPI_DMA_H_
#define _CPPI_DMA_H_
#include <linux/slab.h>
#include <linux/list.h>
#include <linux/errno.h>
#include <linux/dmapool.h>
#include "musb_dma.h"
#include "musb_core.h"
/* FIXME fully isolate CPPI from DaVinci ... the "CPPI generic" registers
* would seem to be shared with the TUSB6020 (over VLYNQ).
*/
#include "davinci.h"
/* CPPI RX/TX state RAM */
struct cppi_tx_stateram {
u32 tx_head; /* "DMA packet" head descriptor */
u32 tx_buf;
u32 tx_current; /* current descriptor */
u32 tx_buf_current;
u32 tx_info; /* flags, remaining buflen */
u32 tx_rem_len;
u32 tx_dummy; /* unused */
u32 tx_complete;
};
struct cppi_rx_stateram {
u32 rx_skipbytes;
u32 rx_head;
u32 rx_sop; /* "DMA packet" head descriptor */
u32 rx_current; /* current descriptor */
u32 rx_buf_current;
u32 rx_len_len;
u32 rx_cnt_cnt;
u32 rx_complete;
};
/* hw_options bits in CPPI buffer descriptors */
#define CPPI_SOP_SET ((u32)(1 << 31))
#define CPPI_EOP_SET ((u32)(1 << 30))
#define CPPI_OWN_SET ((u32)(1 << 29)) /* owned by cppi */
#define CPPI_EOQ_MASK ((u32)(1 << 28))
#define CPPI_ZERO_SET ((u32)(1 << 23)) /* rx saw zlp; tx issues one */
#define CPPI_RXABT_MASK ((u32)(1 << 19)) /* need more rx buffers */
#define CPPI_RECV_PKTLEN_MASK 0xFFFF
#define CPPI_BUFFER_LEN_MASK 0xFFFF
#define CPPI_TEAR_READY ((u32)(1 << 31))
/* CPPI data structure definitions */
#define CPPI_DESCRIPTOR_ALIGN 16 /* bytes; 5-dec docs say 4-byte align */
struct cppi_descriptor {
/* hardware overlay */
u32 hw_next; /* next buffer descriptor Pointer */
u32 hw_bufp; /* i/o buffer pointer */
u32 hw_off_len; /* buffer_offset16, buffer_length16 */
u32 hw_options; /* flags: SOP, EOP etc*/
struct cppi_descriptor *next;
dma_addr_t dma; /* address of this descriptor */
u32 buflen; /* for RX: original buffer length */
} __attribute__ ((aligned(CPPI_DESCRIPTOR_ALIGN)));
struct cppi;
/* CPPI Channel Control structure */
struct cppi_channel {
struct dma_channel channel;
/* back pointer to the DMA controller structure */
struct cppi *controller;
/* which direction of which endpoint? */
struct musb_hw_ep *hw_ep;
bool transmit;
u8 index;
/* DMA modes: RNDIS or "transparent" */
u8 is_rndis;
/* book keeping for current transfer request */
dma_addr_t buf_dma;
u32 buf_len;
u32 maxpacket;
u32 offset; /* dma requested */
void __iomem *state_ram; /* CPPI state */
struct cppi_descriptor *freelist;
/* BD management fields */
struct cppi_descriptor *head;
struct cppi_descriptor *tail;
struct cppi_descriptor *last_processed;
/* use tx_complete in host role to track endpoints waiting for
* FIFONOTEMPTY to clear.
*/
struct list_head tx_complete;
};
/* CPPI DMA controller object */
struct cppi {
struct dma_controller controller;
struct musb *musb;
void __iomem *mregs; /* Mentor regs */
void __iomem *tibase; /* TI/CPPI regs */
int irq;
struct cppi_channel tx[4];
struct cppi_channel rx[4];
struct dma_pool *pool;
struct list_head tx_complete;
};
/* CPPI IRQ handler */
extern irqreturn_t cppi_interrupt(int, void *);
#endif /* end of ifndef _CPPI_DMA_H_ */
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