projects / people / ms / u-boot.git / blame
| Commit | Line | Data |
|---|---|---|
| c9d4f46b SM |
1 | /* |
| 2 | * (C) Copyright 2004, Psyent Corporation <www.psyent.com> | |
| 3 | * Scott McNutt <smcnutt@psyent.com> | |
| 4 | * | |
| 5 | * See file CREDITS for list of people who contributed to this | |
| 6 | * project. | |
| 7 | * | |
| 8 | * This program is free software; you can redistribute it and/or | |
| 9 | * modify it under the terms of the GNU General Public License as | |
| 10 | * published by the Free Software Foundation; either version 2 of | |
| 11 | * the License, or (at your option) any later version. | |
| 12 | * | |
| 13 | * This program is distributed in the hope that it will be useful, | |
| 14 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
| 15 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
| 16 | * GNU General Public License for more details. | |
| 17 | * | |
| 18 | * You should have received a copy of the GNU General Public License | |
| 19 | * along with this program; if not, write to the Free Software | |
| 20 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, | |
| 21 | * MA 02111-1307 USA | |
| 22 | */ | |
| 23 | ||
| 24 | #include <common.h> | |
| 25 | #include <watchdog.h> | |
| 26 | #include <asm/io.h> | |
| 27 | #include <nios2-io.h> | |
| 8c085757 MV |
28 | #include <linux/compiler.h> |
| 29 | #include <serial.h> | |
| c9d4f46b SM |
30 | |
| 31 | DECLARE_GLOBAL_DATA_PTR; | |
| 32 | ||
| 33 | /*------------------------------------------------------------------ | |
| 34 | * JTAG acts as the serial port | |
| 35 | *-----------------------------------------------------------------*/ | |
| 36 | static nios_jtag_t *jtag = (nios_jtag_t *)CONFIG_SYS_NIOS_CONSOLE; | |
| 37 | ||
| 8c085757 MV |
38 | static void altera_jtag_serial_setbrg(void) |
| 39 | { | |
| 40 | } | |
| 41 | ||
| 42 | static int altera_jtag_serial_init(void) | |
| 43 | { | |
| 44 | return 0; | |
| 45 | } | |
| c9d4f46b | 46 | |
| 8c085757 | 47 | static void altera_jtag_serial_putc(char c) |
| c9d4f46b | 48 | { |
| 99485296 TC |
49 | while (1) { |
| 50 | unsigned st = readl(&jtag->control); | |
| 51 | if (NIOS_JTAG_WSPACE(st)) | |
| 52 | break; | |
| 53 | #ifdef CONFIG_ALTERA_JTAG_UART_BYPASS | |
| 54 | if (!(st & NIOS_JTAG_AC)) /* no connection */ | |
| 55 | return; | |
| 56 | #endif | |
| 57 | WATCHDOG_RESET(); | |
| 58 | } | |
| 3ea0037f | 59 | writel ((unsigned char)c, &jtag->data); |
| c9d4f46b SM |
60 | } |
| 61 | ||
| 8c085757 | 62 | static int altera_jtag_serial_tstc(void) |
| c9d4f46b SM |
63 | { |
| 64 | return ( readl (&jtag->control) & NIOS_JTAG_RRDY); | |
| 65 | } | |
| 66 | ||
| 8c085757 | 67 | static int altera_jtag_serial_getc(void) |
| c9d4f46b SM |
68 | { |
| 69 | int c; | |
| 70 | unsigned val; | |
| 71 | ||
| 72 | while (1) { | |
| 73 | WATCHDOG_RESET (); | |
| 74 | val = readl (&jtag->data); | |
| 75 | if (val & NIOS_JTAG_RVALID) | |
| 76 | break; | |
| 77 | } | |
| 78 | c = val & 0x0ff; | |
| 79 | return (c); | |
| 80 | } | |
| 8c085757 | 81 | |
| 8c085757 MV |
82 | static struct serial_device altera_jtag_serial_drv = { |
| 83 | .name = "altera_jtag_uart", | |
| 84 | .start = altera_jtag_serial_init, | |
| 85 | .stop = NULL, | |
| 86 | .setbrg = altera_jtag_serial_setbrg, | |
| 87 | .putc = altera_jtag_serial_putc, | |
| ec3fd689 | 88 | .puts = default_serial_puts, |
| 8c085757 MV |
89 | .getc = altera_jtag_serial_getc, |
| 90 | .tstc = altera_jtag_serial_tstc, | |
| 91 | }; | |
| 92 | ||
| 93 | void altera_jtag_serial_initialize(void) | |
| 94 | { | |
| 95 | serial_register(&altera_jtag_serial_drv); | |
| 96 | } | |
| 97 | ||
| 98 | __weak struct serial_device *default_serial_console(void) | |
| 99 | { | |
| 100 | return &altera_jtag_serial_drv; | |
| 101 | } |