1 /* 2 * serial.h: Arch-dep definitions for the Etrax100 serial driver. 3 * 4 * Copyright (C) 1998-2007 Axis Communications AB 5 */ 6 7 #ifndef _ETRAX_SERIAL_H 8 #define _ETRAX_SERIAL_H 9 10 #include <linux/circ_buf.h> 11 #include <asm/termios.h> 12 #include <asm/dma.h> 13 #include <arch/io_interface_mux.h> 14 15 /* Software state per channel */ 16 17 #ifdef __KERNEL__ 18 /* 19 * This is our internal structure for each serial port's state. 20 * 21 * Many fields are paralleled by the structure used by the serial_struct 22 * structure. 23 * 24 * For definitions of the flags field, see tty.h 25 */ 26 27 #define SERIAL_RECV_DESCRIPTORS 8 28 29 struct etrax_recv_buffer { 30 struct etrax_recv_buffer *next; 31 unsigned short length; 32 unsigned char error; 33 unsigned char pad; 34 35 unsigned char buffer[0]; 36 }; 37 38 struct e100_serial { 39 struct tty_port port; 40 int baud; 41 volatile u8 *ioport; /* R_SERIALx_CTRL */ 42 u32 irq; /* bitnr in R_IRQ_MASK2 for dmaX_descr */ 43 44 /* Output registers */ 45 volatile u8 *oclrintradr; /* adr to R_DMA_CHx_CLR_INTR */ 46 volatile u32 *ofirstadr; /* adr to R_DMA_CHx_FIRST */ 47 volatile u8 *ocmdadr; /* adr to R_DMA_CHx_CMD */ 48 const volatile u8 *ostatusadr; /* adr to R_DMA_CHx_STATUS */ 49 50 /* Input registers */ 51 volatile u8 *iclrintradr; /* adr to R_DMA_CHx_CLR_INTR */ 52 volatile u32 *ifirstadr; /* adr to R_DMA_CHx_FIRST */ 53 volatile u8 *icmdadr; /* adr to R_DMA_CHx_CMD */ 54 volatile u32 *idescradr; /* adr to R_DMA_CHx_DESCR */ 55 56 u8 rx_ctrl; /* shadow for R_SERIALx_REC_CTRL */ 57 u8 tx_ctrl; /* shadow for R_SERIALx_TR_CTRL */ 58 u8 iseteop; /* bit number for R_SET_EOP for the input dma */ 59 int enabled; /* Set to 1 if the port is enabled in HW config */ 60 61 u8 dma_out_enabled; /* Set to 1 if DMA should be used */ 62 u8 dma_in_enabled; /* Set to 1 if DMA should be used */ 63 64 /* end of fields defined in rs_table[] in .c-file */ 65 int dma_owner; 66 unsigned int dma_in_nbr; 67 unsigned int dma_out_nbr; 68 unsigned int dma_in_irq_nbr; 69 unsigned int dma_out_irq_nbr; 70 unsigned long dma_in_irq_flags; 71 unsigned long dma_out_irq_flags; 72 char *dma_in_irq_description; 73 char *dma_out_irq_description; 74 75 enum cris_io_interface io_if; 76 char *io_if_description; 77 78 u8 uses_dma_in; /* Set to 1 if DMA is used */ 79 u8 uses_dma_out; /* Set to 1 if DMA is used */ 80 u8 forced_eop; /* a fifo eop has been forced */ 81 int baud_base; /* For special baudrates */ 82 int custom_divisor; /* For special baudrates */ 83 struct etrax_dma_descr tr_descr; 84 struct etrax_dma_descr rec_descr[SERIAL_RECV_DESCRIPTORS]; 85 int cur_rec_descr; 86 87 volatile int tr_running; /* 1 if output is running */ 88 89 int x_char; /* xon/xoff character */ 90 unsigned long event; 91 int line; 92 int type; /* PORT_ETRAX */ 93 struct circ_buf xmit; 94 struct etrax_recv_buffer *first_recv_buffer; 95 struct etrax_recv_buffer *last_recv_buffer; 96 unsigned int recv_cnt; 97 unsigned int max_recv_cnt; 98 99 struct work_struct work; 100 struct async_icount icount; /* error-statistics etc.*/ 101 struct ktermios normal_termios; 102 103 unsigned long char_time_usec; /* The time for 1 char, in usecs */ 104 unsigned long flush_time_usec; /* How often we should flush */ 105 unsigned long last_tx_active_usec; /* Last tx usec in the jiffies */ 106 unsigned long last_tx_active; /* Last tx time in jiffies */ 107 unsigned long last_rx_active_usec; /* Last rx usec in the jiffies */ 108 unsigned long last_rx_active; /* Last rx time in jiffies */ 109 110 int break_detected_cnt; 111 int errorcode; 112 113 #ifdef CONFIG_ETRAX_RS485 114 struct serial_rs485 rs485; /* RS-485 support */ 115 #endif 116 }; 117 118 /* this PORT is not in the standard serial.h. it's not actually used for 119 * anything since we only have one type of async serial-port anyway in this 120 * system. 121 */ 122 123 #define PORT_ETRAX 1 124 125 /* 126 * Events are used to schedule things to happen at timer-interrupt 127 * time, instead of at rs interrupt time. 128 */ 129 #define RS_EVENT_WRITE_WAKEUP 0 130 131 #endif /* __KERNEL__ */ 132 133 #endif /* !_ETRAX_SERIAL_H */ 134