xref: /openbmc/linux/drivers/tty/serial/zs.h (revision b2441318)
1 /* SPDX-License-Identifier: GPL-2.0 */
2 /*
3  * zs.h: Definitions for the DECstation Z85C30 serial driver.
4  *
5  * Adapted from drivers/sbus/char/sunserial.h by Paul Mackerras.
6  * Adapted from drivers/macintosh/macserial.h by Harald Koerfgen.
7  *
8  * Copyright (C) 1996 Paul Mackerras (Paul.Mackerras@cs.anu.edu.au)
9  * Copyright (C) 1995 David S. Miller (davem@caip.rutgers.edu)
10  * Copyright (C) 2004, 2005, 2007  Maciej W. Rozycki
11  */
12 #ifndef _SERIAL_ZS_H
13 #define _SERIAL_ZS_H
14 
15 #ifdef __KERNEL__
16 
17 #define ZS_NUM_REGS 16
18 
19 /*
20  * This is our internal structure for each serial port's state.
21  */
22 struct zs_port {
23 	struct zs_scc	*scc;			/* Containing SCC.  */
24 	struct uart_port port;			/* Underlying UART.  */
25 
26 	int		clk_mode;		/* May be 1, 16, 32, or 64.  */
27 
28 	unsigned int	tty_break;		/* Set on BREAK condition.  */
29 	int		tx_stopped;		/* Output is suspended.  */
30 
31 	unsigned int	mctrl;			/* State of modem lines.  */
32 	u8		brk;			/* BREAK state from RR0.  */
33 
34 	u8		regs[ZS_NUM_REGS];	/* Channel write registers.  */
35 };
36 
37 /*
38  * Per-SCC state for locking and the interrupt handler.
39  */
40 struct zs_scc {
41 	struct zs_port	zport[2];
42 	spinlock_t	zlock;
43 	atomic_t	irq_guard;
44 	int		initialised;
45 };
46 
47 #endif /* __KERNEL__ */
48 
49 /*
50  * Conversion routines to/from brg time constants from/to bits per second.
51  */
52 #define ZS_BRG_TO_BPS(brg, freq) ((freq) / 2 / ((brg) + 2))
53 #define ZS_BPS_TO_BRG(bps, freq) ((((freq) + (bps)) / (2 * (bps))) - 2)
54 
55 /*
56  * The Zilog register set.
57  */
58 
59 /* Write Register 0 (Command) */
60 #define R0		0	/* Register selects */
61 #define R1		1
62 #define R2		2
63 #define R3		3
64 #define R4		4
65 #define R5		5
66 #define R6		6
67 #define R7		7
68 #define R8		8
69 #define R9		9
70 #define R10		10
71 #define R11		11
72 #define R12		12
73 #define R13		13
74 #define R14		14
75 #define R15		15
76 
77 #define NULLCODE	0	/* Null Code */
78 #define POINT_HIGH	0x8	/* Select upper half of registers */
79 #define RES_EXT_INT	0x10	/* Reset Ext. Status Interrupts */
80 #define SEND_ABORT	0x18	/* HDLC Abort */
81 #define RES_RxINT_FC	0x20	/* Reset RxINT on First Character */
82 #define RES_Tx_P	0x28	/* Reset TxINT Pending */
83 #define ERR_RES		0x30	/* Error Reset */
84 #define RES_H_IUS	0x38	/* Reset highest IUS */
85 
86 #define RES_Rx_CRC	0x40	/* Reset Rx CRC Checker */
87 #define RES_Tx_CRC	0x80	/* Reset Tx CRC Checker */
88 #define RES_EOM_L	0xC0	/* Reset EOM latch */
89 
90 /* Write Register 1 (Tx/Rx/Ext Int Enable and WAIT/DMA Commands) */
91 #define EXT_INT_ENAB	0x1	/* Ext Int Enable */
92 #define TxINT_ENAB	0x2	/* Tx Int Enable */
93 #define PAR_SPEC	0x4	/* Parity is special condition */
94 
95 #define RxINT_DISAB	0	/* Rx Int Disable */
96 #define RxINT_FCERR	0x8	/* Rx Int on First Character Only or Error */
97 #define RxINT_ALL	0x10	/* Int on all Rx Characters or error */
98 #define RxINT_ERR	0x18	/* Int on error only */
99 #define RxINT_MASK	0x18
100 
101 #define WT_RDY_RT	0x20	/* Wait/Ready on R/T */
102 #define WT_FN_RDYFN	0x40	/* Wait/FN/Ready FN */
103 #define WT_RDY_ENAB	0x80	/* Wait/Ready Enable */
104 
105 /* Write Register 2 (Interrupt Vector) */
106 
107 /* Write Register 3 (Receive Parameters and Control) */
108 #define RxENABLE	0x1	/* Rx Enable */
109 #define SYNC_L_INH	0x2	/* Sync Character Load Inhibit */
110 #define ADD_SM		0x4	/* Address Search Mode (SDLC) */
111 #define RxCRC_ENAB	0x8	/* Rx CRC Enable */
112 #define ENT_HM		0x10	/* Enter Hunt Mode */
113 #define AUTO_ENAB	0x20	/* Auto Enables */
114 #define Rx5		0x0	/* Rx 5 Bits/Character */
115 #define Rx7		0x40	/* Rx 7 Bits/Character */
116 #define Rx6		0x80	/* Rx 6 Bits/Character */
117 #define Rx8		0xc0	/* Rx 8 Bits/Character */
118 #define RxNBITS_MASK	0xc0
119 
120 /* Write Register 4 (Transmit/Receive Miscellaneous Parameters and Modes) */
121 #define PAR_ENA		0x1	/* Parity Enable */
122 #define PAR_EVEN	0x2	/* Parity Even/Odd* */
123 
124 #define SYNC_ENAB	0	/* Sync Modes Enable */
125 #define SB1		0x4	/* 1 stop bit/char */
126 #define SB15		0x8	/* 1.5 stop bits/char */
127 #define SB2		0xc	/* 2 stop bits/char */
128 #define SB_MASK		0xc
129 
130 #define MONSYNC		0	/* 8 Bit Sync character */
131 #define BISYNC		0x10	/* 16 bit sync character */
132 #define SDLC		0x20	/* SDLC Mode (01111110 Sync Flag) */
133 #define EXTSYNC		0x30	/* External Sync Mode */
134 
135 #define X1CLK		0x0	/* x1 clock mode */
136 #define X16CLK		0x40	/* x16 clock mode */
137 #define X32CLK		0x80	/* x32 clock mode */
138 #define X64CLK		0xc0	/* x64 clock mode */
139 #define XCLK_MASK	0xc0
140 
141 /* Write Register 5 (Transmit Parameters and Controls) */
142 #define TxCRC_ENAB	0x1	/* Tx CRC Enable */
143 #define RTS		0x2	/* RTS */
144 #define SDLC_CRC	0x4	/* SDLC/CRC-16 */
145 #define TxENAB		0x8	/* Tx Enable */
146 #define SND_BRK		0x10	/* Send Break */
147 #define Tx5		0x0	/* Tx 5 bits (or less)/character */
148 #define Tx7		0x20	/* Tx 7 bits/character */
149 #define Tx6		0x40	/* Tx 6 bits/character */
150 #define Tx8		0x60	/* Tx 8 bits/character */
151 #define TxNBITS_MASK	0x60
152 #define DTR		0x80	/* DTR */
153 
154 /* Write Register 6 (Sync bits 0-7/SDLC Address Field) */
155 
156 /* Write Register 7 (Sync bits 8-15/SDLC 01111110) */
157 
158 /* Write Register 8 (Transmit Buffer) */
159 
160 /* Write Register 9 (Master Interrupt Control) */
161 #define VIS		1	/* Vector Includes Status */
162 #define NV		2	/* No Vector */
163 #define DLC		4	/* Disable Lower Chain */
164 #define MIE		8	/* Master Interrupt Enable */
165 #define STATHI		0x10	/* Status high */
166 #define SOFTACK		0x20	/* Software Interrupt Acknowledge */
167 #define NORESET		0	/* No reset on write to R9 */
168 #define CHRB		0x40	/* Reset channel B */
169 #define CHRA		0x80	/* Reset channel A */
170 #define FHWRES		0xc0	/* Force hardware reset */
171 
172 /* Write Register 10 (Miscellaneous Transmitter/Receiver Control Bits) */
173 #define BIT6		1	/* 6 bit/8bit sync */
174 #define LOOPMODE	2	/* SDLC Loop mode */
175 #define ABUNDER		4	/* Abort/flag on SDLC xmit underrun */
176 #define MARKIDLE	8	/* Mark/flag on idle */
177 #define GAOP		0x10	/* Go active on poll */
178 #define NRZ		0	/* NRZ mode */
179 #define NRZI		0x20	/* NRZI mode */
180 #define FM1		0x40	/* FM1 (transition = 1) */
181 #define FM0		0x60	/* FM0 (transition = 0) */
182 #define CRCPS		0x80	/* CRC Preset I/O */
183 
184 /* Write Register 11 (Clock Mode Control) */
185 #define TRxCXT		0	/* TRxC = Xtal output */
186 #define TRxCTC		1	/* TRxC = Transmit clock */
187 #define TRxCBR		2	/* TRxC = BR Generator Output */
188 #define TRxCDP		3	/* TRxC = DPLL output */
189 #define TRxCOI		4	/* TRxC O/I */
190 #define TCRTxCP		0	/* Transmit clock = RTxC pin */
191 #define TCTRxCP		8	/* Transmit clock = TRxC pin */
192 #define TCBR		0x10	/* Transmit clock = BR Generator output */
193 #define TCDPLL		0x18	/* Transmit clock = DPLL output */
194 #define RCRTxCP		0	/* Receive clock = RTxC pin */
195 #define RCTRxCP		0x20	/* Receive clock = TRxC pin */
196 #define RCBR		0x40	/* Receive clock = BR Generator output */
197 #define RCDPLL		0x60	/* Receive clock = DPLL output */
198 #define RTxCX		0x80	/* RTxC Xtal/No Xtal */
199 
200 /* Write Register 12 (Lower Byte of Baud Rate Generator Time Constant) */
201 
202 /* Write Register 13 (Upper Byte of Baud Rate Generator Time Constant) */
203 
204 /* Write Register 14 (Miscellaneous Control Bits) */
205 #define BRENABL		1	/* Baud rate generator enable */
206 #define BRSRC		2	/* Baud rate generator source */
207 #define DTRREQ		4	/* DTR/Request function */
208 #define AUTOECHO	8	/* Auto Echo */
209 #define LOOPBAK		0x10	/* Local loopback */
210 #define SEARCH		0x20	/* Enter search mode */
211 #define RMC		0x40	/* Reset missing clock */
212 #define DISDPLL		0x60	/* Disable DPLL */
213 #define SSBR		0x80	/* Set DPLL source = BR generator */
214 #define SSRTxC		0xa0	/* Set DPLL source = RTxC */
215 #define SFMM		0xc0	/* Set FM mode */
216 #define SNRZI		0xe0	/* Set NRZI mode */
217 
218 /* Write Register 15 (External/Status Interrupt Control) */
219 #define WR7P_EN		1	/* WR7 Prime SDLC Feature Enable */
220 #define ZCIE		2	/* Zero count IE */
221 #define DCDIE		8	/* DCD IE */
222 #define SYNCIE		0x10	/* Sync/hunt IE */
223 #define CTSIE		0x20	/* CTS IE */
224 #define TxUIE		0x40	/* Tx Underrun/EOM IE */
225 #define BRKIE		0x80	/* Break/Abort IE */
226 
227 
228 /* Read Register 0 (Transmit/Receive Buffer Status and External Status) */
229 #define Rx_CH_AV	0x1	/* Rx Character Available */
230 #define ZCOUNT		0x2	/* Zero count */
231 #define Tx_BUF_EMP	0x4	/* Tx Buffer empty */
232 #define DCD		0x8	/* DCD */
233 #define SYNC_HUNT	0x10	/* Sync/hunt */
234 #define CTS		0x20	/* CTS */
235 #define TxEOM		0x40	/* Tx underrun */
236 #define BRK_ABRT	0x80	/* Break/Abort */
237 
238 /* Read Register 1 (Special Receive Condition Status) */
239 #define ALL_SNT		0x1	/* All sent */
240 /* Residue Data for 8 Rx bits/char programmed */
241 #define RES3		0x8	/* 0/3 */
242 #define RES4		0x4	/* 0/4 */
243 #define RES5		0xc	/* 0/5 */
244 #define RES6		0x2	/* 0/6 */
245 #define RES7		0xa	/* 0/7 */
246 #define RES8		0x6	/* 0/8 */
247 #define RES18		0xe	/* 1/8 */
248 #define RES28		0x0	/* 2/8 */
249 /* Special Rx Condition Interrupts */
250 #define PAR_ERR		0x10	/* Parity Error */
251 #define Rx_OVR		0x20	/* Rx Overrun Error */
252 #define FRM_ERR		0x40	/* CRC/Framing Error */
253 #define END_FR		0x80	/* End of Frame (SDLC) */
254 
255 /* Read Register 2 (Interrupt Vector (WR2) -- channel A).  */
256 
257 /* Read Register 2 (Modified Interrupt Vector -- channel B).  */
258 
259 /* Read Register 3 (Interrupt Pending Bits -- channel A only).  */
260 #define CHBEXT		0x1	/* Channel B Ext/Stat IP */
261 #define CHBTxIP		0x2	/* Channel B Tx IP */
262 #define CHBRxIP		0x4	/* Channel B Rx IP */
263 #define CHAEXT		0x8	/* Channel A Ext/Stat IP */
264 #define CHATxIP		0x10	/* Channel A Tx IP */
265 #define CHARxIP		0x20	/* Channel A Rx IP */
266 
267 /* Read Register 6 (SDLC FIFO Status and Byte Count LSB) */
268 
269 /* Read Register 7 (SDLC FIFO Status and Byte Count MSB) */
270 
271 /* Read Register 8 (Receive Data) */
272 
273 /* Read Register 10 (Miscellaneous Status Bits) */
274 #define ONLOOP		2	/* On loop */
275 #define LOOPSEND	0x10	/* Loop sending */
276 #define CLK2MIS		0x40	/* Two clocks missing */
277 #define CLK1MIS		0x80	/* One clock missing */
278 
279 /* Read Register 12 (Lower Byte of Baud Rate Generator Constant (WR12)) */
280 
281 /* Read Register 13 (Upper Byte of Baud Rate Generator Constant (WR13) */
282 
283 /* Read Register 15 (External/Status Interrupt Control (WR15)) */
284 
285 #endif /* _SERIAL_ZS_H */
286