3 * This file is subject to the terms and conditions of the GNU General Public
4 * License. See the file "COPYING" in the main directory of this archive
7 * Copyright (C) 1992-1997,2000-2003 Silicon Graphics, Inc. All rights reserved.
10 #ifndef _ASM_IA64_SN_UART16550_H
11 #define _ASM_IA64_SN_UART16550_H
15 * Definitions for 16550 chip
18 /* defined as offsets from the data register */
19 #define REG_DAT 0 /* receive/transmit data */
20 #define REG_ICR 1 /* interrupt control register */
21 #define REG_ISR 2 /* interrupt status register */
22 #define REG_FCR 2 /* fifo control register */
23 #define REG_LCR 3 /* line control register */
24 #define REG_MCR 4 /* modem control register */
25 #define REG_LSR 5 /* line status register */
26 #define REG_MSR 6 /* modem status register */
27 #define REG_SCR 7 /* Scratch register */
28 #define REG_DLL 0 /* divisor latch (lsb) */
29 #define REG_DLH 1 /* divisor latch (msb) */
30 #define REG_EFR 2 /* 16650 enhanced feature register */
33 * 16450/16550 Registers Structure.
36 /* Line Control Register */
37 #define LCR_WLS0 0x01 /*word length select bit 0 */
38 #define LCR_WLS1 0x02 /*word length select bit 2 */
39 #define LCR_STB 0x04 /* number of stop bits */
40 #define LCR_PEN 0x08 /* parity enable */
41 #define LCR_EPS 0x10 /* even parity select */
42 #define LCR_SETBREAK 0x40 /* break key */
43 #define LCR_DLAB 0x80 /* divisor latch access bit */
44 #define LCR_RXLEN 0x03 /* # of data bits per received/xmitted char */
45 #define LCR_STOP1 0x00
46 #define LCR_STOP2 0x04
47 #define LCR_PAREN 0x08
48 #define LCR_PAREVN 0x10
49 #define LCR_PARMARK 0x20
50 #define LCR_SNDBRK 0x40
54 #define LCR_BITS5 0x00 /* 5 bits per char */
55 #define LCR_BITS6 0x01 /* 6 bits per char */
56 #define LCR_BITS7 0x02 /* 7 bits per char */
57 #define LCR_BITS8 0x03 /* 8 bits per char */
59 #define LCR_MASK_BITS_CHAR 0x03
60 #define LCR_MASK_STOP_BITS 0x04
61 #define LCR_MASK_PARITY_BITS 0x18
64 /* Line Status Register */
65 #define LSR_RCA 0x01 /* data ready */
66 #define LSR_OVRRUN 0x02 /* overrun error */
67 #define LSR_PARERR 0x04 /* parity error */
68 #define LSR_FRMERR 0x08 /* framing error */
69 #define LSR_BRKDET 0x10 /* a break has arrived */
70 #define LSR_XHRE 0x20 /* tx hold reg is now empty */
71 #define LSR_XSRE 0x40 /* tx shift reg is now empty */
72 #define LSR_RFBE 0x80 /* rx FIFO Buffer error */
74 /* Interrupt Status Regisger */
75 #define ISR_MSTATUS 0x00
76 #define ISR_TxRDY 0x02
77 #define ISR_RxRDY 0x04
78 #define ISR_ERROR_INTR 0x08
79 #define ISR_FFTMOUT 0x0c /* FIFO Timeout */
80 #define ISR_RSTATUS 0x06 /* Receiver Line status */
82 /* Interrupt Enable Register */
83 #define ICR_RIEN 0x01 /* Received Data Ready */
84 #define ICR_TIEN 0x02 /* Tx Hold Register Empty */
85 #define ICR_SIEN 0x04 /* Receiver Line Status */
86 #define ICR_MIEN 0x08 /* Modem Status */
88 /* Modem Control Register */
89 #define MCR_DTR 0x01 /* Data Terminal Ready */
90 #define MCR_RTS 0x02 /* Request To Send */
91 #define MCR_OUT1 0x04 /* Aux output - not used */
92 #define MCR_OUT2 0x08 /* turns intr to 386 on/off */
93 #define MCR_LOOP 0x10 /* loopback for diagnostics */
94 #define MCR_AFE 0x20 /* Auto flow control enable */
96 /* Modem Status Register */
97 #define MSR_DCTS 0x01 /* Delta Clear To Send */
98 #define MSR_DDSR 0x02 /* Delta Data Set Ready */
99 #define MSR_DRI 0x04 /* Trail Edge Ring Indicator */
100 #define MSR_DDCD 0x08 /* Delta Data Carrier Detect */
101 #define MSR_CTS 0x10 /* Clear To Send */
102 #define MSR_DSR 0x20 /* Data Set Ready */
103 #define MSR_RI 0x40 /* Ring Indicator */
104 #define MSR_DCD 0x80 /* Data Carrier Detect */
106 #define DELTAS(x) ((x)&(MSR_DCTS|MSR_DDSR|MSR_DRI|MSR_DDCD))
107 #define STATES(x) ((x)(MSR_CTS|MSR_DSR|MSR_RI|MSR_DCD))
110 #define FCR_FIFOEN 0x01 /* enable receive/transmit fifo */
111 #define FCR_RxFIFO 0x02 /* enable receive fifo */
112 #define FCR_TxFIFO 0x04 /* enable transmit fifo */
113 #define FCR_MODE1 0x08 /* change to mode 1 */
114 #define RxLVL0 0x00 /* Rx fifo level at 1 */
115 #define RxLVL1 0x40 /* Rx fifo level at 4 */
116 #define RxLVL2 0x80 /* Rx fifo level at 8 */
117 #define RxLVL3 0xc0 /* Rx fifo level at 14 */
119 #define FIFOEN (FCR_FIFOEN | FCR_RxFIFO | FCR_TxFIFO | RxLVL3 | FCR_MODE1)
121 #define FCT_TxMASK 0x30 /* mask for Tx trigger */
122 #define FCT_RxMASK 0xc0 /* mask for Rx trigger */
124 /* enhanced festures register */
125 #define EFR_SFLOW 0x0f /* various S/w Flow Controls */
126 #define EFR_EIC 0x10 /* Enhanced Interrupt Control bit */
127 #define EFR_SCD 0x20 /* Special Character Detect */
128 #define EFR_RTS 0x40 /* RTS flow control */
129 #define EFR_CTS 0x80 /* CTS flow control */
131 /* Rx Tx software flow controls in 16650 enhanced mode */
132 #define SFLOW_Tx0 0x00 /* no Xmit flow control */
133 #define SFLOW_Tx1 0x08 /* Transmit Xon1, Xoff1 */
134 #define SFLOW_Tx2 0x04 /* Transmit Xon2, Xoff2 */
135 #define SFLOW_Tx3 0x0c /* Transmit Xon1,Xon2, Xoff1,Xoff2 */
136 #define SFLOW_Rx0 0x00 /* no Rcv flow control */
137 #define SFLOW_Rx1 0x02 /* Receiver compares Xon1, Xoff1 */
138 #define SFLOW_Rx2 0x01 /* Receiver compares Xon2, Xoff2 */
140 #define ASSERT_DTR(x) (x |= MCR_DTR)
141 #define ASSERT_RTS(x) (x |= MCR_RTS)
142 #define DU_RTS_ASSERTED(x) (((x) & MCR_RTS) != 0)
143 #define DU_RTS_ASSERT(x) ((x) |= MCR_RTS)
144 #define DU_RTS_DEASSERT(x) ((x) &= ~MCR_RTS)
148 * ioctl(fd, I_STR, arg)
149 * use the SIOC_RS422 and SIOC_EXTCLK combination to support MIDI
151 #define SIOC ('z' << 8) /* z for z85130 */
152 #define SIOC_EXTCLK (SIOC | 1) /* select/de-select external clock */
153 #define SIOC_RS422 (SIOC | 2) /* select/de-select RS422 protocol */
154 #define SIOC_ITIMER (SIOC | 3) /* upstream timer adjustment */
155 #define SIOC_LOOPBACK (SIOC | 4) /* diagnostic loopback test mode */
158 /* channel control register */
159 #define DMA_INT_MASK 0xe0 /* ring intr mask */
160 #define DMA_INT_TH25 0x20 /* 25% threshold */
161 #define DMA_INT_TH50 0x40 /* 50% threshold */
162 #define DMA_INT_TH75 0x60 /* 75% threshold */
163 #define DMA_INT_EMPTY 0x80 /* ring buffer empty */
164 #define DMA_INT_NEMPTY 0xa0 /* ring buffer not empty */
165 #define DMA_INT_FULL 0xc0 /* ring buffer full */
166 #define DMA_INT_NFULL 0xe0 /* ring buffer not full */
168 #define DMA_CHANNEL_RESET 0x400 /* reset dma channel */
169 #define DMA_ENABLE 0x200 /* enable DMA */
171 /* peripheral controller intr status bits applicable to serial ports */
172 #define ISA_SERIAL0_MASK 0x03f00000 /* mask for port #1 intrs */
173 #define ISA_SERIAL0_DIR 0x00100000 /* device intr request */
174 #define ISA_SERIAL0_Tx_THIR 0x00200000 /* Transmit DMA threshold */
175 #define ISA_SERIAL0_Tx_PREQ 0x00400000 /* Transmit DMA pair req */
176 #define ISA_SERIAL0_Tx_MEMERR 0x00800000 /* Transmit DMA memory err */
177 #define ISA_SERIAL0_Rx_THIR 0x01000000 /* Receive DMA threshold */
178 #define ISA_SERIAL0_Rx_OVERRUN 0x02000000 /* Receive DMA over-run */
180 #define ISA_SERIAL1_MASK 0xfc000000 /* mask for port #1 intrs */
181 #define ISA_SERIAL1_DIR 0x04000000 /* device intr request */
182 #define ISA_SERIAL1_Tx_THIR 0x08000000 /* Transmit DMA threshold */
183 #define ISA_SERIAL1_Tx_PREQ 0x10000000 /* Transmit DMA pair req */
184 #define ISA_SERIAL1_Tx_MEMERR 0x20000000 /* Transmit DMA memory err */
185 #define ISA_SERIAL1_Rx_THIR 0x40000000 /* Receive DMA threshold */
186 #define ISA_SERIAL1_Rx_OVERRUN 0x80000000 /* Receive DMA over-run */
188 #define MAX_RING_BLOCKS 128 /* 4096/32 */
189 #define MAX_RING_SIZE 4096
191 /* DMA Input Control Byte */
192 #define DMA_IC_OVRRUN 0x01 /* overrun error */
193 #define DMA_IC_PARERR 0x02 /* parity error */
194 #define DMA_IC_FRMERR 0x04 /* framing error */
195 #define DMA_IC_BRKDET 0x08 /* a break has arrived */
196 #define DMA_IC_VALID 0x80 /* pair is valid */
198 /* DMA Output Control Byte */
199 #define DMA_OC_TxINTR 0x20 /* set Tx intr after processing byte */
200 #define DMA_OC_INVALID 0x00 /* invalid pair */
201 #define DMA_OC_WTHR 0x40 /* Write byte to THR */
202 #define DMA_OC_WMCR 0x80 /* Write byte to MCR */
203 #define DMA_OC_DELAY 0xc0 /* time delay before next xmit */
206 #define RID_SERIAL0_TX 0x4 /* serial port 0, transmit ring buffer */
207 #define RID_SERIAL0_RX 0x5 /* serial port 0, receive ring buffer */
208 #define RID_SERIAL1_TX 0x6 /* serial port 1, transmit ring buffer */
209 #define RID_SERIAL1_RX 0x7 /* serial port 1, receive ring buffer */
212 #define PRESCALER_DIVISOR 3
213 #define CLOCK_ACE 7333333
216 * increment the ring offset. One way to do this would be to add b'100000.
217 * this would let the offset value roll over automatically when it reaches
218 * its maximum value (127). However when we use the offset, we must use
219 * the appropriate bits only by masking with 0xfe0.
220 * The other option is to shift the offset right by 5 bits and look at its
221 * value. Then increment if required and shift back
222 * note: 127 * 2^5 = 4064
224 #define INC_RING_POINTER(x) \
225 ( ((x & 0xffe0) < 4064) ? (x += 32) : 0 )
227 #endif /* _ASM_IA64_SN_UART16550_H */