1 /*- 2 * SPDX-License-Identifier: BSD-2-Clause-FreeBSD 3 * 4 * Copyright (c) 2011-2012 Robert N. M. Watson 5 * All rights reserved. 6 * 7 * This software was developed by SRI International and the University of 8 * Cambridge Computer Laboratory under DARPA/AFRL contract (FA8750-10-C-0237) 9 * ("CTSRD"), as part of the DARPA CRASH research programme. 10 * 11 * Redistribution and use in source and binary forms, with or without 12 * modification, are permitted provided that the following conditions 13 * are met: 14 * 1. Redistributions of source code must retain the above copyright 15 * notice, this list of conditions and the following disclaimer. 16 * 2. Redistributions in binary form must reproduce the above copyright 17 * notice, this list of conditions and the following disclaimer in the 18 * documentation and/or other materials provided with the distribution. 19 * 20 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 21 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 22 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 23 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 24 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 25 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 26 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 27 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 28 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 29 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 30 * SUCH DAMAGE. 31 * 32 * $FreeBSD$ 33 */ 34 35 #ifndef _DEV_ALTERA_JTAG_UART_H_ 36 #define _DEV_ALTERA_JTAG_UART_H_ 37 38 struct altera_jtag_uart_softc { 39 device_t ajus_dev; 40 int ajus_unit; 41 42 /* 43 * Hardware resources. 44 */ 45 struct resource *ajus_irq_res; 46 int ajus_irq_rid; 47 void *ajus_irq_cookie; 48 struct resource *ajus_mem_res; 49 int ajus_mem_rid; 50 51 /* 52 * TTY resources. 53 */ 54 struct tty *ajus_ttyp; 55 int ajus_alt_break_state; 56 57 /* 58 * Driver resources. 59 */ 60 u_int ajus_flags; 61 struct mtx *ajus_lockp; 62 struct mtx ajus_lock; 63 struct callout ajus_io_callout; 64 struct callout ajus_ac_callout; 65 66 /* 67 * One-character buffer required because it's not possible to peek at 68 * the input FIFO without reading it. 69 */ 70 int ajus_buffer_valid; 71 int *ajus_buffer_validp; 72 uint8_t ajus_buffer_data; 73 uint8_t *ajus_buffer_datap; 74 int ajus_jtag_present; 75 int *ajus_jtag_presentp; 76 u_int ajus_jtag_missed; 77 u_int *ajus_jtag_missedp; 78 }; 79 80 #define AJU_TTYNAME "ttyj" 81 82 /* 83 * Flag values for ajus_flags. 84 */ 85 #define ALTERA_JTAG_UART_FLAG_CONSOLE 0x00000001 /* Is console. */ 86 87 /* 88 * Because tty-level use of the I/O ports completes with low-level console 89 * use, spinlocks must be employed here. 90 */ 91 #define AJU_CONSOLE_LOCK_INIT() do { \ 92 mtx_init(&aju_cons_lock, "aju_cons_lock", NULL, MTX_SPIN); \ 93 } while (0) 94 95 #define AJU_CONSOLE_LOCK() do { \ 96 if (!kdb_active) \ 97 mtx_lock_spin(&aju_cons_lock); \ 98 } while (0) 99 100 #define AJU_CONSOLE_LOCK_ASSERT() { \ 101 if (!kdb_active) \ 102 mtx_assert(&aju_cons_lock, MA_OWNED); \ 103 } while (0) 104 105 #define AJU_CONSOLE_UNLOCK() do { \ 106 if (!kdb_active) \ 107 mtx_unlock_spin(&aju_cons_lock); \ 108 } while (0) 109 110 #define AJU_LOCK_INIT(sc) do { \ 111 mtx_init(&(sc)->ajus_lock, "aju_lock", NULL, MTX_SPIN); \ 112 } while (0) 113 114 #define AJU_LOCK_DESTROY(sc) do { \ 115 mtx_destroy(&(sc)->ajus_lock); \ 116 } while (0) 117 118 #define AJU_LOCK(sc) do { \ 119 mtx_lock_spin((sc)->ajus_lockp); \ 120 } while (0) 121 122 #define AJU_LOCK_ASSERT(sc) do { \ 123 mtx_assert((sc)->ajus_lockp, MA_OWNED); \ 124 } while (0) 125 126 #define AJU_UNLOCK(sc) do { \ 127 mtx_unlock_spin((sc)->ajus_lockp); \ 128 } while (0) 129 130 /* 131 * When a TTY-level Altera JTAG UART instance is also the low-level console, 132 * the TTY layer borrows the console-layer lock and buffer rather than using 133 * its own. 134 */ 135 extern struct mtx aju_cons_lock; 136 extern char aju_cons_buffer_data; 137 extern int aju_cons_buffer_valid; 138 extern int aju_cons_jtag_present; 139 extern u_int aju_cons_jtag_missed; 140 141 /* 142 * Base physical address of the JTAG UART in BERI. 143 */ 144 #define BERI_UART_BASE 0x7f000000 /* JTAG UART */ 145 146 /*- 147 * Routines for interacting with the BERI console JTAG UART. Programming 148 * details from the June 2011 "Embedded Peripherals User Guide" by Altera 149 * Corporation, tables 6-2 (JTAG UART Core Register Map), 6-3 (Data Register 150 * Bits), and 6-4 (Control Register Bits). 151 * 152 * Offsets of data and control registers relative to the base. Altera 153 * conventions are maintained in BERI. 154 */ 155 #define ALTERA_JTAG_UART_DATA_OFF 0x00000000 156 #define ALTERA_JTAG_UART_CONTROL_OFF 0x00000004 157 158 /* 159 * Offset 0: 'data' register -- bits 31-16 (RAVAIL), 15 (RVALID), 160 * 14-8 (Reserved), 7-0 (DATA). 161 * 162 * DATA - One byte read or written. 163 * RAVAIL - Bytes available to read (excluding the current byte). 164 * RVALID - Whether the byte in DATA is valid. 165 */ 166 #define ALTERA_JTAG_UART_DATA_DATA 0x000000ff 167 #define ALTERA_JTAG_UART_DATA_RESERVED 0x00007f00 168 #define ALTERA_JTAG_UART_DATA_RVALID 0x00008000 169 #define ALTERA_JTAG_UART_DATA_RAVAIL 0xffff0000 170 #define ALTERA_JTAG_UART_DATA_RAVAIL_SHIFT 16 171 172 /*- 173 * Offset 1: 'control' register -- bits 31-16 (WSPACE), 15-11 (Reserved), 174 * 10 (AC), 9 (WI), 8 (RI), 7..2 (Reserved), 1 (WE), 0 (RE). 175 * 176 * RE - Enable read interrupts. 177 * WE - Enable write interrupts. 178 * RI - Read interrupt pending. 179 * WI - Write interrupt pending. 180 * AC - Activity bit; set to '1' to clear to '0'. 181 * WSPACE - Space available in the write FIFO. 182 */ 183 #define ALTERA_JTAG_UART_CONTROL_RE 0x00000001 184 #define ALTERA_JTAG_UART_CONTROL_WE 0x00000002 185 #define ALTERA_JTAG_UART_CONTROL_RESERVED0 0x000000fc 186 #define ALTERA_JTAG_UART_CONTROL_RI 0x00000100 187 #define ALTERA_JTAG_UART_CONTROL_WI 0x00000200 188 #define ALTERA_JTAG_UART_CONTROL_AC 0x00000400 189 #define ALTERA_JTAG_UART_CONTROL_RESERVED1 0x0000f800 190 #define ALTERA_JTAG_UART_CONTROL_WSPACE 0xffff0000 191 #define ALTERA_JTAG_UART_CONTROL_WSPACE_SHIFT 16 192 193 /* 194 * Driver attachment functions for Nexus. 195 */ 196 int altera_jtag_uart_attach(struct altera_jtag_uart_softc *sc); 197 void altera_jtag_uart_detach(struct altera_jtag_uart_softc *sc); 198 199 extern devclass_t altera_jtag_uart_devclass; 200 201 #endif /* _DEV_ALTERA_JTAG_UART_H_ */ 202