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