1 /* Copyright (C) 2005-2006 by Texas Instruments */ 2 3 #ifndef _CPPI_DMA_H_ 4 #define _CPPI_DMA_H_ 5 6 #include <linux/slab.h> 7 #include <linux/list.h> 8 #include <linux/errno.h> 9 #include <linux/dmapool.h> 10 #include <linux/dmaengine.h> 11 12 #include "musb_core.h" 13 #include "musb_dma.h" 14 15 /* CPPI RX/TX state RAM */ 16 17 struct cppi_tx_stateram { 18 u32 tx_head; /* "DMA packet" head descriptor */ 19 u32 tx_buf; 20 u32 tx_current; /* current descriptor */ 21 u32 tx_buf_current; 22 u32 tx_info; /* flags, remaining buflen */ 23 u32 tx_rem_len; 24 u32 tx_dummy; /* unused */ 25 u32 tx_complete; 26 }; 27 28 struct cppi_rx_stateram { 29 u32 rx_skipbytes; 30 u32 rx_head; 31 u32 rx_sop; /* "DMA packet" head descriptor */ 32 u32 rx_current; /* current descriptor */ 33 u32 rx_buf_current; 34 u32 rx_len_len; 35 u32 rx_cnt_cnt; 36 u32 rx_complete; 37 }; 38 39 /* hw_options bits in CPPI buffer descriptors */ 40 #define CPPI_SOP_SET ((u32)(1 << 31)) 41 #define CPPI_EOP_SET ((u32)(1 << 30)) 42 #define CPPI_OWN_SET ((u32)(1 << 29)) /* owned by cppi */ 43 #define CPPI_EOQ_MASK ((u32)(1 << 28)) 44 #define CPPI_ZERO_SET ((u32)(1 << 23)) /* rx saw zlp; tx issues one */ 45 #define CPPI_RXABT_MASK ((u32)(1 << 19)) /* need more rx buffers */ 46 47 #define CPPI_RECV_PKTLEN_MASK 0xFFFF 48 #define CPPI_BUFFER_LEN_MASK 0xFFFF 49 50 #define CPPI_TEAR_READY ((u32)(1 << 31)) 51 52 /* CPPI data structure definitions */ 53 54 #define CPPI_DESCRIPTOR_ALIGN 16 /* bytes; 5-dec docs say 4-byte align */ 55 56 struct cppi_descriptor { 57 /* hardware overlay */ 58 u32 hw_next; /* next buffer descriptor Pointer */ 59 u32 hw_bufp; /* i/o buffer pointer */ 60 u32 hw_off_len; /* buffer_offset16, buffer_length16 */ 61 u32 hw_options; /* flags: SOP, EOP etc*/ 62 63 struct cppi_descriptor *next; 64 dma_addr_t dma; /* address of this descriptor */ 65 u32 buflen; /* for RX: original buffer length */ 66 } __attribute__ ((aligned(CPPI_DESCRIPTOR_ALIGN))); 67 68 69 struct cppi; 70 71 /* CPPI Channel Control structure */ 72 struct cppi_channel { 73 struct dma_channel channel; 74 75 /* back pointer to the DMA controller structure */ 76 struct cppi *controller; 77 78 /* which direction of which endpoint? */ 79 struct musb_hw_ep *hw_ep; 80 bool transmit; 81 u8 index; 82 83 /* DMA modes: RNDIS or "transparent" */ 84 u8 is_rndis; 85 86 /* book keeping for current transfer request */ 87 dma_addr_t buf_dma; 88 u32 buf_len; 89 u32 maxpacket; 90 u32 offset; /* dma requested */ 91 92 void __iomem *state_ram; /* CPPI state */ 93 94 struct cppi_descriptor *freelist; 95 96 /* BD management fields */ 97 struct cppi_descriptor *head; 98 struct cppi_descriptor *tail; 99 struct cppi_descriptor *last_processed; 100 101 /* use tx_complete in host role to track endpoints waiting for 102 * FIFONOTEMPTY to clear. 103 */ 104 struct list_head tx_complete; 105 }; 106 107 /* CPPI DMA controller object */ 108 struct cppi { 109 struct dma_controller controller; 110 struct musb *musb; 111 void __iomem *mregs; /* Mentor regs */ 112 void __iomem *tibase; /* TI/CPPI regs */ 113 114 int irq; 115 116 struct cppi_channel tx[4]; 117 struct cppi_channel rx[4]; 118 119 struct dma_pool *pool; 120 121 struct list_head tx_complete; 122 }; 123 124 /* CPPI IRQ handler */ 125 extern irqreturn_t cppi_interrupt(int, void *); 126 127 struct cppi41_dma_channel { 128 struct dma_channel channel; 129 struct cppi41_dma_controller *controller; 130 struct musb_hw_ep *hw_ep; 131 struct dma_chan *dc; 132 dma_cookie_t cookie; 133 u8 port_num; 134 u8 is_tx; 135 u8 is_allocated; 136 u8 usb_toggle; 137 138 dma_addr_t buf_addr; 139 u32 total_len; 140 u32 prog_len; 141 u32 transferred; 142 u32 packet_sz; 143 struct list_head tx_check; 144 int tx_zlp; 145 }; 146 147 #endif /* end of ifndef _CPPI_DMA_H_ */ 148