1 /* SPDX-License-Identifier: GPL-1.0+ WITH Linux-syscall-note */ 2 /* 3 * include/linux/serial_reg.h 4 * 5 * Copyright (C) 1992, 1994 by Theodore Ts'o. 6 * 7 * Redistribution of this file is permitted under the terms of the GNU 8 * Public License (GPL) 9 * 10 * These are the UART port assignments, expressed as offsets from the base 11 * register. These assignments should hold for any serial port based on 12 * a 8250, 16450, or 16550(A). 13 */ 14 15 #ifndef _LINUX_SERIAL_REG_H 16 #define _LINUX_SERIAL_REG_H 17 18 /* 19 * DLAB=0 20 */ 21 #define UART_RX 0 /* In: Receive buffer */ 22 #define UART_TX 0 /* Out: Transmit buffer */ 23 24 #define UART_IER 1 /* Out: Interrupt Enable Register */ 25 #define UART_IER_MSI 0x08 /* Enable Modem status interrupt */ 26 #define UART_IER_RLSI 0x04 /* Enable receiver line status interrupt */ 27 #define UART_IER_THRI 0x02 /* Enable Transmitter holding register int. */ 28 #define UART_IER_RDI 0x01 /* Enable receiver data interrupt */ 29 /* 30 * Sleep mode for ST16650 and TI16750. For the ST16650, EFR[4]=1 31 */ 32 #define UART_IERX_SLEEP 0x10 /* Enable sleep mode */ 33 34 #define UART_IIR 2 /* In: Interrupt ID Register */ 35 #define UART_IIR_NO_INT 0x01 /* No interrupts pending */ 36 #define UART_IIR_ID 0x0e /* Mask for the interrupt ID */ 37 #define UART_IIR_MSI 0x00 /* Modem status interrupt */ 38 #define UART_IIR_THRI 0x02 /* Transmitter holding register empty */ 39 #define UART_IIR_RDI 0x04 /* Receiver data interrupt */ 40 #define UART_IIR_RLSI 0x06 /* Receiver line status interrupt */ 41 42 #define UART_IIR_BUSY 0x07 /* DesignWare APB Busy Detect */ 43 44 #define UART_IIR_RX_TIMEOUT 0x0c /* OMAP RX Timeout interrupt */ 45 #define UART_IIR_XOFF 0x10 /* OMAP XOFF/Special Character */ 46 #define UART_IIR_CTS_RTS_DSR 0x20 /* OMAP CTS/RTS/DSR Change */ 47 #define UART_IIR_64BYTE_FIFO 0x20 /* 16750 64 bytes FIFO */ 48 #define UART_IIR_FIFO_ENABLED 0xc0 /* FIFOs enabled / port type identification */ 49 #define UART_IIR_FIFO_ENABLED_8250 0x00 /* 8250: no FIFO */ 50 #define UART_IIR_FIFO_ENABLED_16550 0x80 /* 16550: (broken/unusable) FIFO */ 51 #define UART_IIR_FIFO_ENABLED_16550A 0xc0 /* 16550A: FIFO enabled */ 52 53 #define UART_FCR 2 /* Out: FIFO Control Register */ 54 #define UART_FCR_ENABLE_FIFO 0x01 /* Enable the FIFO */ 55 #define UART_FCR_CLEAR_RCVR 0x02 /* Clear the RCVR FIFO */ 56 #define UART_FCR_CLEAR_XMIT 0x04 /* Clear the XMIT FIFO */ 57 #define UART_FCR_DMA_SELECT 0x08 /* For DMA applications */ 58 /* 59 * Note: The FIFO trigger levels are chip specific: 60 * RX:76 = 00 01 10 11 TX:54 = 00 01 10 11 61 * PC16550D: 1 4 8 14 xx xx xx xx 62 * TI16C550A: 1 4 8 14 xx xx xx xx 63 * TI16C550C: 1 4 8 14 xx xx xx xx 64 * ST16C550: 1 4 8 14 xx xx xx xx 65 * ST16C650: 8 16 24 28 16 8 24 30 PORT_16650V2 66 * NS16C552: 1 4 8 14 xx xx xx xx 67 * ST16C654: 8 16 56 60 8 16 32 56 PORT_16654 68 * TI16C750: 1 16 32 56 xx xx xx xx PORT_16750 69 * TI16C752: 8 16 56 60 8 16 32 56 70 * OX16C950: 16 32 112 120 16 32 64 112 PORT_16C950 71 * Tegra: 1 4 8 14 16 8 4 1 PORT_TEGRA 72 */ 73 #define UART_FCR_R_TRIG_00 0x00 74 #define UART_FCR_R_TRIG_01 0x40 75 #define UART_FCR_R_TRIG_10 0x80 76 #define UART_FCR_R_TRIG_11 0xc0 77 #define UART_FCR_T_TRIG_00 0x00 78 #define UART_FCR_T_TRIG_01 0x10 79 #define UART_FCR_T_TRIG_10 0x20 80 #define UART_FCR_T_TRIG_11 0x30 81 82 #define UART_FCR_TRIGGER_MASK 0xC0 /* Mask for the FIFO trigger range */ 83 #define UART_FCR_TRIGGER_1 0x00 /* Mask for trigger set at 1 */ 84 #define UART_FCR_TRIGGER_4 0x40 /* Mask for trigger set at 4 */ 85 #define UART_FCR_TRIGGER_8 0x80 /* Mask for trigger set at 8 */ 86 #define UART_FCR_TRIGGER_14 0xC0 /* Mask for trigger set at 14 */ 87 /* 16650 definitions */ 88 #define UART_FCR6_R_TRIGGER_8 0x00 /* Mask for receive trigger set at 1 */ 89 #define UART_FCR6_R_TRIGGER_16 0x40 /* Mask for receive trigger set at 4 */ 90 #define UART_FCR6_R_TRIGGER_24 0x80 /* Mask for receive trigger set at 8 */ 91 #define UART_FCR6_R_TRIGGER_28 0xC0 /* Mask for receive trigger set at 14 */ 92 #define UART_FCR6_T_TRIGGER_16 0x00 /* Mask for transmit trigger set at 16 */ 93 #define UART_FCR6_T_TRIGGER_8 0x10 /* Mask for transmit trigger set at 8 */ 94 #define UART_FCR6_T_TRIGGER_24 0x20 /* Mask for transmit trigger set at 24 */ 95 #define UART_FCR6_T_TRIGGER_30 0x30 /* Mask for transmit trigger set at 30 */ 96 #define UART_FCR7_64BYTE 0x20 /* Go into 64 byte mode (TI16C750 and 97 some Freescale UARTs) */ 98 99 #define UART_FCR_R_TRIG_SHIFT 6 100 #define UART_FCR_R_TRIG_BITS(x) \ 101 (((x) & UART_FCR_TRIGGER_MASK) >> UART_FCR_R_TRIG_SHIFT) 102 #define UART_FCR_R_TRIG_MAX_STATE 4 103 104 #define UART_LCR 3 /* Out: Line Control Register */ 105 /* 106 * Note: if the word length is 5 bits (UART_LCR_WLEN5), then setting 107 * UART_LCR_STOP will select 1.5 stop bits, not 2 stop bits. 108 */ 109 #define UART_LCR_DLAB 0x80 /* Divisor latch access bit */ 110 #define UART_LCR_SBC 0x40 /* Set break control */ 111 #define UART_LCR_SPAR 0x20 /* Stick parity (?) */ 112 #define UART_LCR_EPAR 0x10 /* Even parity select */ 113 #define UART_LCR_PARITY 0x08 /* Parity Enable */ 114 #define UART_LCR_STOP 0x04 /* Stop bits: 0=1 bit, 1=2 bits */ 115 #define UART_LCR_WLEN5 0x00 /* Wordlength: 5 bits */ 116 #define UART_LCR_WLEN6 0x01 /* Wordlength: 6 bits */ 117 #define UART_LCR_WLEN7 0x02 /* Wordlength: 7 bits */ 118 #define UART_LCR_WLEN8 0x03 /* Wordlength: 8 bits */ 119 120 /* 121 * Access to some registers depends on register access / configuration 122 * mode. 123 */ 124 #define UART_LCR_CONF_MODE_A UART_LCR_DLAB /* Configutation mode A */ 125 #define UART_LCR_CONF_MODE_B 0xBF /* Configutation mode B */ 126 127 #define UART_MCR 4 /* Out: Modem Control Register */ 128 #define UART_MCR_CLKSEL 0x80 /* Divide clock by 4 (TI16C752, EFR[4]=1) */ 129 #define UART_MCR_TCRTLR 0x40 /* Access TCR/TLR (TI16C752, EFR[4]=1) */ 130 #define UART_MCR_XONANY 0x20 /* Enable Xon Any (TI16C752, EFR[4]=1) */ 131 #define UART_MCR_AFE 0x20 /* Enable auto-RTS/CTS (TI16C550C/TI16C750) */ 132 #define UART_MCR_LOOP 0x10 /* Enable loopback test mode */ 133 #define UART_MCR_OUT2 0x08 /* Out2 complement */ 134 #define UART_MCR_OUT1 0x04 /* Out1 complement */ 135 #define UART_MCR_RTS 0x02 /* RTS complement */ 136 #define UART_MCR_DTR 0x01 /* DTR complement */ 137 138 #define UART_LSR 5 /* In: Line Status Register */ 139 #define UART_LSR_FIFOE 0x80 /* Fifo error */ 140 #define UART_LSR_TEMT 0x40 /* Transmitter empty */ 141 #define UART_LSR_THRE 0x20 /* Transmit-hold-register empty */ 142 #define UART_LSR_BI 0x10 /* Break interrupt indicator */ 143 #define UART_LSR_FE 0x08 /* Frame error indicator */ 144 #define UART_LSR_PE 0x04 /* Parity error indicator */ 145 #define UART_LSR_OE 0x02 /* Overrun error indicator */ 146 #define UART_LSR_DR 0x01 /* Receiver data ready */ 147 #define UART_LSR_BRK_ERROR_BITS (UART_LSR_BI|UART_LSR_FE|UART_LSR_PE|UART_LSR_OE) 148 149 #define UART_MSR 6 /* In: Modem Status Register */ 150 #define UART_MSR_DCD 0x80 /* Data Carrier Detect */ 151 #define UART_MSR_RI 0x40 /* Ring Indicator */ 152 #define UART_MSR_DSR 0x20 /* Data Set Ready */ 153 #define UART_MSR_CTS 0x10 /* Clear to Send */ 154 #define UART_MSR_DDCD 0x08 /* Delta DCD */ 155 #define UART_MSR_TERI 0x04 /* Trailing edge ring indicator */ 156 #define UART_MSR_DDSR 0x02 /* Delta DSR */ 157 #define UART_MSR_DCTS 0x01 /* Delta CTS */ 158 #define UART_MSR_ANY_DELTA (UART_MSR_DDCD|UART_MSR_TERI|UART_MSR_DDSR|UART_MSR_DCTS) 159 160 #define UART_SCR 7 /* I/O: Scratch Register */ 161 162 /* 163 * DLAB=1 164 */ 165 #define UART_DLL 0 /* Out: Divisor Latch Low */ 166 #define UART_DLM 1 /* Out: Divisor Latch High */ 167 #define UART_DIV_MAX 0xFFFF /* Max divisor value */ 168 169 /* 170 * LCR=0xBF (or DLAB=1 for 16C660) 171 */ 172 #define UART_EFR 2 /* I/O: Extended Features Register */ 173 #define UART_XR_EFR 9 /* I/O: Extended Features Register (XR17D15x) */ 174 #define UART_EFR_CTS 0x80 /* CTS flow control */ 175 #define UART_EFR_RTS 0x40 /* RTS flow control */ 176 #define UART_EFR_SCD 0x20 /* Special character detect */ 177 #define UART_EFR_ECB 0x10 /* Enhanced control bit */ 178 /* 179 * the low four bits control software flow control 180 */ 181 182 /* 183 * LCR=0xBF, TI16C752, ST16650, ST16650A, ST16654 184 */ 185 #define UART_XON1 4 /* I/O: Xon character 1 */ 186 #define UART_XON2 5 /* I/O: Xon character 2 */ 187 #define UART_XOFF1 6 /* I/O: Xoff character 1 */ 188 #define UART_XOFF2 7 /* I/O: Xoff character 2 */ 189 190 /* 191 * EFR[4]=1 MCR[6]=1, TI16C752 192 */ 193 #define UART_TI752_TCR 6 /* I/O: transmission control register */ 194 #define UART_TI752_TLR 7 /* I/O: trigger level register */ 195 196 /* 197 * LCR=0xBF, XR16C85x 198 */ 199 #define UART_TRG 0 /* FCTR bit 7 selects Rx or Tx 200 * In: Fifo count 201 * Out: Fifo custom trigger levels */ 202 /* 203 * These are the definitions for the Programmable Trigger Register 204 */ 205 #define UART_TRG_1 0x01 206 #define UART_TRG_4 0x04 207 #define UART_TRG_8 0x08 208 #define UART_TRG_16 0x10 209 #define UART_TRG_32 0x20 210 #define UART_TRG_64 0x40 211 #define UART_TRG_96 0x60 212 #define UART_TRG_120 0x78 213 #define UART_TRG_128 0x80 214 215 #define UART_FCTR 1 /* Feature Control Register */ 216 #define UART_FCTR_RTS_NODELAY 0x00 /* RTS flow control delay */ 217 #define UART_FCTR_RTS_4DELAY 0x01 218 #define UART_FCTR_RTS_6DELAY 0x02 219 #define UART_FCTR_RTS_8DELAY 0x03 220 #define UART_FCTR_IRDA 0x04 /* IrDa data encode select */ 221 #define UART_FCTR_TX_INT 0x08 /* Tx interrupt type select */ 222 #define UART_FCTR_TRGA 0x00 /* Tx/Rx 550 trigger table select */ 223 #define UART_FCTR_TRGB 0x10 /* Tx/Rx 650 trigger table select */ 224 #define UART_FCTR_TRGC 0x20 /* Tx/Rx 654 trigger table select */ 225 #define UART_FCTR_TRGD 0x30 /* Tx/Rx 850 programmable trigger select */ 226 #define UART_FCTR_SCR_SWAP 0x40 /* Scratch pad register swap */ 227 #define UART_FCTR_RX 0x00 /* Programmable trigger mode select */ 228 #define UART_FCTR_TX 0x80 /* Programmable trigger mode select */ 229 230 /* 231 * LCR=0xBF, FCTR[6]=1 232 */ 233 #define UART_EMSR 7 /* Extended Mode Select Register */ 234 #define UART_EMSR_FIFO_COUNT 0x01 /* Rx/Tx select */ 235 #define UART_EMSR_ALT_COUNT 0x02 /* Alternating count select */ 236 237 /* 238 * The Intel XScale on-chip UARTs define these bits 239 */ 240 #define UART_IER_DMAE 0x80 /* DMA Requests Enable */ 241 #define UART_IER_UUE 0x40 /* UART Unit Enable */ 242 #define UART_IER_NRZE 0x20 /* NRZ coding Enable */ 243 #define UART_IER_RTOIE 0x10 /* Receiver Time Out Interrupt Enable */ 244 245 #define UART_IIR_TOD 0x08 /* Character Timeout Indication Detected */ 246 247 #define UART_FCR_PXAR1 0x00 /* receive FIFO threshold = 1 */ 248 #define UART_FCR_PXAR8 0x40 /* receive FIFO threshold = 8 */ 249 #define UART_FCR_PXAR16 0x80 /* receive FIFO threshold = 16 */ 250 #define UART_FCR_PXAR32 0xc0 /* receive FIFO threshold = 32 */ 251 252 /* 253 * These register definitions are for the 16C950 254 */ 255 #define UART_ASR 0x01 /* Additional Status Register */ 256 #define UART_RFL 0x03 /* Receiver FIFO level */ 257 #define UART_TFL 0x04 /* Transmitter FIFO level */ 258 #define UART_ICR 0x05 /* Index Control Register */ 259 260 /* The 16950 ICR registers */ 261 #define UART_ACR 0x00 /* Additional Control Register */ 262 #define UART_CPR 0x01 /* Clock Prescalar Register */ 263 #define UART_TCR 0x02 /* Times Clock Register */ 264 #define UART_CKS 0x03 /* Clock Select Register */ 265 #define UART_TTL 0x04 /* Transmitter Interrupt Trigger Level */ 266 #define UART_RTL 0x05 /* Receiver Interrupt Trigger Level */ 267 #define UART_FCL 0x06 /* Flow Control Level Lower */ 268 #define UART_FCH 0x07 /* Flow Control Level Higher */ 269 #define UART_ID1 0x08 /* ID #1 */ 270 #define UART_ID2 0x09 /* ID #2 */ 271 #define UART_ID3 0x0A /* ID #3 */ 272 #define UART_REV 0x0B /* Revision */ 273 #define UART_CSR 0x0C /* Channel Software Reset */ 274 #define UART_NMR 0x0D /* Nine-bit Mode Register */ 275 #define UART_CTR 0xFF 276 277 /* 278 * The 16C950 Additional Control Register 279 */ 280 #define UART_ACR_RXDIS 0x01 /* Receiver disable */ 281 #define UART_ACR_TXDIS 0x02 /* Transmitter disable */ 282 #define UART_ACR_DSRFC 0x04 /* DSR Flow Control */ 283 #define UART_ACR_TLENB 0x20 /* 950 trigger levels enable */ 284 #define UART_ACR_ICRRD 0x40 /* ICR Read enable */ 285 #define UART_ACR_ASREN 0x80 /* Additional status enable */ 286 287 288 289 /* 290 * These definitions are for the RSA-DV II/S card, from 291 * 292 * Kiyokazu SUTO <suto@ks-and-ks.ne.jp> 293 */ 294 295 #define UART_RSA_BASE (-8) 296 297 #define UART_RSA_MSR ((UART_RSA_BASE) + 0) /* I/O: Mode Select Register */ 298 299 #define UART_RSA_MSR_SWAP (1 << 0) /* Swap low/high 8 bytes in I/O port addr */ 300 #define UART_RSA_MSR_FIFO (1 << 2) /* Enable the external FIFO */ 301 #define UART_RSA_MSR_FLOW (1 << 3) /* Enable the auto RTS/CTS flow control */ 302 #define UART_RSA_MSR_ITYP (1 << 4) /* Level (1) / Edge triger (0) */ 303 304 #define UART_RSA_IER ((UART_RSA_BASE) + 1) /* I/O: Interrupt Enable Register */ 305 306 #define UART_RSA_IER_Rx_FIFO_H (1 << 0) /* Enable Rx FIFO half full int. */ 307 #define UART_RSA_IER_Tx_FIFO_H (1 << 1) /* Enable Tx FIFO half full int. */ 308 #define UART_RSA_IER_Tx_FIFO_E (1 << 2) /* Enable Tx FIFO empty int. */ 309 #define UART_RSA_IER_Rx_TOUT (1 << 3) /* Enable char receive timeout int */ 310 #define UART_RSA_IER_TIMER (1 << 4) /* Enable timer interrupt */ 311 312 #define UART_RSA_SRR ((UART_RSA_BASE) + 2) /* IN: Status Read Register */ 313 314 #define UART_RSA_SRR_Tx_FIFO_NEMP (1 << 0) /* Tx FIFO is not empty (1) */ 315 #define UART_RSA_SRR_Tx_FIFO_NHFL (1 << 1) /* Tx FIFO is not half full (1) */ 316 #define UART_RSA_SRR_Tx_FIFO_NFUL (1 << 2) /* Tx FIFO is not full (1) */ 317 #define UART_RSA_SRR_Rx_FIFO_NEMP (1 << 3) /* Rx FIFO is not empty (1) */ 318 #define UART_RSA_SRR_Rx_FIFO_NHFL (1 << 4) /* Rx FIFO is not half full (1) */ 319 #define UART_RSA_SRR_Rx_FIFO_NFUL (1 << 5) /* Rx FIFO is not full (1) */ 320 #define UART_RSA_SRR_Rx_TOUT (1 << 6) /* Character reception timeout occurred (1) */ 321 #define UART_RSA_SRR_TIMER (1 << 7) /* Timer interrupt occurred */ 322 323 #define UART_RSA_FRR ((UART_RSA_BASE) + 2) /* OUT: FIFO Reset Register */ 324 325 #define UART_RSA_TIVSR ((UART_RSA_BASE) + 3) /* I/O: Timer Interval Value Set Register */ 326 327 #define UART_RSA_TCR ((UART_RSA_BASE) + 4) /* OUT: Timer Control Register */ 328 329 #define UART_RSA_TCR_SWITCH (1 << 0) /* Timer on */ 330 331 /* 332 * The RSA DSV/II board has two fixed clock frequencies. One is the 333 * standard rate, and the other is 8 times faster. 334 */ 335 #define SERIAL_RSA_BAUD_BASE (921600) 336 #define SERIAL_RSA_BAUD_BASE_LO (SERIAL_RSA_BAUD_BASE / 8) 337 338 /* Extra registers for TI DA8xx/66AK2x */ 339 #define UART_DA830_PWREMU_MGMT 12 340 341 /* PWREMU_MGMT register bits */ 342 #define UART_DA830_PWREMU_MGMT_FREE (1 << 0) /* Free-running mode */ 343 #define UART_DA830_PWREMU_MGMT_URRST (1 << 13) /* Receiver reset/enable */ 344 #define UART_DA830_PWREMU_MGMT_UTRST (1 << 14) /* Transmitter reset/enable */ 345 346 /* 347 * Extra serial register definitions for the internal UARTs 348 * in TI OMAP processors. 349 */ 350 #define OMAP1_UART1_BASE 0xfffb0000 351 #define OMAP1_UART2_BASE 0xfffb0800 352 #define OMAP1_UART3_BASE 0xfffb9800 353 #define UART_OMAP_MDR1 0x08 /* Mode definition register */ 354 #define UART_OMAP_MDR2 0x09 /* Mode definition register 2 */ 355 #define UART_OMAP_SCR 0x10 /* Supplementary control register */ 356 #define UART_OMAP_SSR 0x11 /* Supplementary status register */ 357 #define UART_OMAP_EBLR 0x12 /* BOF length register */ 358 #define UART_OMAP_OSC_12M_SEL 0x13 /* OMAP1510 12MHz osc select */ 359 #define UART_OMAP_MVER 0x14 /* Module version register */ 360 #define UART_OMAP_SYSC 0x15 /* System configuration register */ 361 #define UART_OMAP_SYSS 0x16 /* System status register */ 362 #define UART_OMAP_WER 0x17 /* Wake-up enable register */ 363 #define UART_OMAP_TX_LVL 0x1a /* TX FIFO level register */ 364 365 /* 366 * These are the definitions for the MDR1 register 367 */ 368 #define UART_OMAP_MDR1_16X_MODE 0x00 /* UART 16x mode */ 369 #define UART_OMAP_MDR1_SIR_MODE 0x01 /* SIR mode */ 370 #define UART_OMAP_MDR1_16X_ABAUD_MODE 0x02 /* UART 16x auto-baud */ 371 #define UART_OMAP_MDR1_13X_MODE 0x03 /* UART 13x mode */ 372 #define UART_OMAP_MDR1_MIR_MODE 0x04 /* MIR mode */ 373 #define UART_OMAP_MDR1_FIR_MODE 0x05 /* FIR mode */ 374 #define UART_OMAP_MDR1_CIR_MODE 0x06 /* CIR mode */ 375 #define UART_OMAP_MDR1_DISABLE 0x07 /* Disable (default state) */ 376 377 /* 378 * These are definitions for the Altera ALTR_16550_F32/F64/F128 379 * Normalized from 0x100 to 0x40 because of shift by 2 (32 bit regs). 380 */ 381 #define UART_ALTR_AFR 0x40 /* Additional Features Register */ 382 #define UART_ALTR_EN_TXFIFO_LW 0x01 /* Enable the TX FIFO Low Watermark */ 383 #define UART_ALTR_TX_LOW 0x41 /* Tx FIFO Low Watermark */ 384 385 #endif /* _LINUX_SERIAL_REG_H */ 386 387