1 /*- 2 * SPDX-License-Identifier: BSD-2-Clause 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 33 #ifndef _DEV_ALTERA_JTAG_UART_H_ 34 #define _DEV_ALTERA_JTAG_UART_H_ 35 36 struct altera_jtag_uart_softc { 37 device_t ajus_dev; 38 int ajus_unit; 39 40 /* 41 * Hardware resources. 42 */ 43 struct resource *ajus_irq_res; 44 int ajus_irq_rid; 45 void *ajus_irq_cookie; 46 struct resource *ajus_mem_res; 47 int ajus_mem_rid; 48 49 /* 50 * TTY resources. 51 */ 52 struct tty *ajus_ttyp; 53 int ajus_alt_break_state; 54 55 /* 56 * Driver resources. 57 */ 58 u_int ajus_flags; 59 struct mtx *ajus_lockp; 60 struct mtx ajus_lock; 61 struct callout ajus_io_callout; 62 struct callout ajus_ac_callout; 63 64 /* 65 * One-character buffer required because it's not possible to peek at 66 * the input FIFO without reading it. 67 */ 68 int ajus_buffer_valid; 69 int *ajus_buffer_validp; 70 uint8_t ajus_buffer_data; 71 uint8_t *ajus_buffer_datap; 72 int ajus_jtag_present; 73 int *ajus_jtag_presentp; 74 u_int ajus_jtag_missed; 75 u_int *ajus_jtag_missedp; 76 }; 77 78 #define AJU_TTYNAME "ttyj" 79 80 /* 81 * Flag values for ajus_flags. 82 */ 83 #define ALTERA_JTAG_UART_FLAG_CONSOLE 0x00000001 /* Is console. */ 84 85 /* 86 * Because tty-level use of the I/O ports completes with low-level console 87 * use, spinlocks must be employed here. 88 */ 89 #define AJU_CONSOLE_LOCK_INIT() do { \ 90 mtx_init(&aju_cons_lock, "aju_cons_lock", NULL, MTX_SPIN); \ 91 } while (0) 92 93 #define AJU_CONSOLE_LOCK() do { \ 94 if (!kdb_active) \ 95 mtx_lock_spin(&aju_cons_lock); \ 96 } while (0) 97 98 #define AJU_CONSOLE_LOCK_ASSERT() { \ 99 if (!kdb_active) \ 100 mtx_assert(&aju_cons_lock, MA_OWNED); \ 101 } while (0) 102 103 #define AJU_CONSOLE_UNLOCK() do { \ 104 if (!kdb_active) \ 105 mtx_unlock_spin(&aju_cons_lock); \ 106 } while (0) 107 108 #define AJU_LOCK_INIT(sc) do { \ 109 mtx_init(&(sc)->ajus_lock, "aju_lock", NULL, MTX_SPIN); \ 110 } while (0) 111 112 #define AJU_LOCK_DESTROY(sc) do { \ 113 mtx_destroy(&(sc)->ajus_lock); \ 114 } while (0) 115 116 #define AJU_LOCK(sc) do { \ 117 mtx_lock_spin((sc)->ajus_lockp); \ 118 } while (0) 119 120 #define AJU_LOCK_ASSERT(sc) do { \ 121 mtx_assert((sc)->ajus_lockp, MA_OWNED); \ 122 } while (0) 123 124 #define AJU_UNLOCK(sc) do { \ 125 mtx_unlock_spin((sc)->ajus_lockp); \ 126 } while (0) 127 128 /* 129 * When a TTY-level Altera JTAG UART instance is also the low-level console, 130 * the TTY layer borrows the console-layer lock and buffer rather than using 131 * its own. 132 */ 133 extern struct mtx aju_cons_lock; 134 extern char aju_cons_buffer_data; 135 extern int aju_cons_buffer_valid; 136 extern int aju_cons_jtag_present; 137 extern u_int aju_cons_jtag_missed; 138 139 /* 140 * Base physical address of the JTAG UART in BERI. 141 */ 142 #define BERI_UART_BASE 0x7f000000 /* JTAG UART */ 143 144 /*- 145 * Routines for interacting with the BERI console JTAG UART. Programming 146 * details from the June 2011 "Embedded Peripherals User Guide" by Altera 147 * Corporation, tables 6-2 (JTAG UART Core Register Map), 6-3 (Data Register 148 * Bits), and 6-4 (Control Register Bits). 149 * 150 * Offsets of data and control registers relative to the base. Altera 151 * conventions are maintained in BERI. 152 */ 153 #define ALTERA_JTAG_UART_DATA_OFF 0x00000000 154 #define ALTERA_JTAG_UART_CONTROL_OFF 0x00000004 155 156 /* 157 * Offset 0: 'data' register -- bits 31-16 (RAVAIL), 15 (RVALID), 158 * 14-8 (Reserved), 7-0 (DATA). 159 * 160 * DATA - One byte read or written. 161 * RAVAIL - Bytes available to read (excluding the current byte). 162 * RVALID - Whether the byte in DATA is valid. 163 */ 164 #define ALTERA_JTAG_UART_DATA_DATA 0x000000ff 165 #define ALTERA_JTAG_UART_DATA_RESERVED 0x00007f00 166 #define ALTERA_JTAG_UART_DATA_RVALID 0x00008000 167 #define ALTERA_JTAG_UART_DATA_RAVAIL 0xffff0000 168 #define ALTERA_JTAG_UART_DATA_RAVAIL_SHIFT 16 169 170 /*- 171 * Offset 1: 'control' register -- bits 31-16 (WSPACE), 15-11 (Reserved), 172 * 10 (AC), 9 (WI), 8 (RI), 7..2 (Reserved), 1 (WE), 0 (RE). 173 * 174 * RE - Enable read interrupts. 175 * WE - Enable write interrupts. 176 * RI - Read interrupt pending. 177 * WI - Write interrupt pending. 178 * AC - Activity bit; set to '1' to clear to '0'. 179 * WSPACE - Space available in the write FIFO. 180 */ 181 #define ALTERA_JTAG_UART_CONTROL_RE 0x00000001 182 #define ALTERA_JTAG_UART_CONTROL_WE 0x00000002 183 #define ALTERA_JTAG_UART_CONTROL_RESERVED0 0x000000fc 184 #define ALTERA_JTAG_UART_CONTROL_RI 0x00000100 185 #define ALTERA_JTAG_UART_CONTROL_WI 0x00000200 186 #define ALTERA_JTAG_UART_CONTROL_AC 0x00000400 187 #define ALTERA_JTAG_UART_CONTROL_RESERVED1 0x0000f800 188 #define ALTERA_JTAG_UART_CONTROL_WSPACE 0xffff0000 189 #define ALTERA_JTAG_UART_CONTROL_WSPACE_SHIFT 16 190 191 /* 192 * Driver attachment functions for Nexus. 193 */ 194 int altera_jtag_uart_attach(struct altera_jtag_uart_softc *sc); 195 void altera_jtag_uart_detach(struct altera_jtag_uart_softc *sc); 196 197 #endif /* _DEV_ALTERA_JTAG_UART_H_ */ 198