1 /* Copyright (C) 2005-2006 by Texas Instruments */
6 #include <linux/slab.h>
7 #include <linux/list.h>
8 #include <linux/smp_lock.h>
9 #include <linux/errno.h>
10 #include <linux/dmapool.h>
13 #include "musb_core.h"
16 /* FIXME fully isolate CPPI from DaVinci ... the "CPPI generic" registers
17 * would seem to be shared with the TUSB6020 (over VLYNQ).
23 /* CPPI RX/TX state RAM */
25 struct cppi_tx_stateram {
26 u32 tx_head; /* "DMA packet" head descriptor */
28 u32 tx_current; /* current descriptor */
30 u32 tx_info; /* flags, remaining buflen */
32 u32 tx_dummy; /* unused */
36 struct cppi_rx_stateram {
39 u32 rx_sop; /* "DMA packet" head descriptor */
40 u32 rx_current; /* current descriptor */
47 /* hw_options bits in CPPI buffer descriptors */
48 #define CPPI_SOP_SET ((u32)(1 << 31))
49 #define CPPI_EOP_SET ((u32)(1 << 30))
50 #define CPPI_OWN_SET ((u32)(1 << 29)) /* owned by cppi */
51 #define CPPI_EOQ_MASK ((u32)(1 << 28))
52 #define CPPI_ZERO_SET ((u32)(1 << 23)) /* rx saw zlp; tx issues one */
53 #define CPPI_RXABT_MASK ((u32)(1 << 19)) /* need more rx buffers */
55 #define CPPI_RECV_PKTLEN_MASK 0xFFFF
56 #define CPPI_BUFFER_LEN_MASK 0xFFFF
58 #define CPPI_TEAR_READY ((u32)(1 << 31))
60 /* CPPI data structure definitions */
62 #define CPPI_DESCRIPTOR_ALIGN 16 /* bytes; 5-dec docs say 4-byte align */
64 struct cppi_descriptor {
65 /* hardware overlay */
66 u32 hw_next; /* next buffer descriptor Pointer */
67 u32 hw_bufp; /* i/o buffer pointer */
68 u32 hw_off_len; /* buffer_offset16, buffer_length16 */
69 u32 hw_options; /* flags: SOP, EOP etc*/
71 struct cppi_descriptor *next;
72 dma_addr_t dma; /* address of this descriptor */
73 u32 buflen; /* for RX: original buffer length */
74 } __attribute__ ((aligned(CPPI_DESCRIPTOR_ALIGN)));
79 /* CPPI Channel Control structure */
81 struct dma_channel channel;
83 /* back pointer to the DMA controller structure */
84 struct cppi *controller;
86 /* which direction of which endpoint? */
87 struct musb_hw_ep *hw_ep;
91 /* DMA modes: RNDIS or "transparent" */
94 /* book keeping for current transfer request */
98 u32 offset; /* dma requested */
100 void __iomem *state_ram; /* CPPI state */
102 struct cppi_descriptor *freelist;
104 /* BD management fields */
105 struct cppi_descriptor *head;
106 struct cppi_descriptor *tail;
107 struct cppi_descriptor *last_processed;
109 /* use tx_complete in host role to track endpoints waiting for
110 * FIFONOTEMPTY to clear.
112 struct list_head tx_complete;
115 /* CPPI DMA controller object */
117 struct dma_controller controller;
119 void __iomem *mregs; /* Mentor regs */
120 void __iomem *tibase; /* TI/CPPI regs */
122 struct cppi_channel tx[MUSB_C_NUM_EPT - 1];
123 struct cppi_channel rx[MUSB_C_NUM_EPR - 1];
125 struct dma_pool *pool;
127 struct list_head tx_complete;
130 /* irq handling hook */
131 extern void cppi_completion(struct musb *, u32 rx, u32 tx);
133 #endif /* end of ifndef _CPPI_DMA_H_ */