[af85485] | 1 | /* |
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| 2 | * Console driver for AT91RM9200 DBGU port |
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| 3 | * |
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[359e537] | 4 | * This driver uses the shared console driver in |
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[af85485] | 5 | * ...../libbsp/shared/console.c |
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| 6 | * |
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| 7 | * Copyright (c) 2003 by Cogent Computer Systems |
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| 8 | * Written by Mike Kelly <mike@cogcomp.com> |
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| 9 | * and Jay Monkman <jtm@lopingdog.com> |
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| 10 | * |
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| 11 | * The license and distribution terms for this file may be |
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| 12 | * found in the file LICENSE in this distribution or at |
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| 13 | * |
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[93f4a906] | 14 | * http://www.rtems.com/license/LICENSE. |
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[af85485] | 15 | * |
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| 16 | * $Id$ |
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| 17 | */ |
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| 18 | #include <bsp.h> |
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| 19 | #include <rtems/libio.h> |
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| 20 | #include <termios.h> |
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| 21 | |
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| 22 | #include <at91rm9200.h> |
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| 23 | #include <at91rm9200_dbgu.h> |
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| 24 | #include <at91rm9200_pmc.h> |
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| 25 | #include <rtems/bspIo.h> |
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| 26 | #include <libchip/serial.h> |
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| 27 | #include <libchip/sersupp.h> |
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| 28 | |
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| 29 | volatile int dbg_dly; |
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| 30 | |
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| 31 | /* static function prototypes */ |
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| 32 | static int dbgu_first_open(int major, int minor, void *arg); |
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| 33 | static int dbgu_last_close(int major, int minor, void *arg); |
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| 34 | static int dbgu_read(int minor); |
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[ae3c037] | 35 | static ssize_t dbgu_write(int minor, const char *buf, size_t len); |
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[af85485] | 36 | static void dbgu_init(int minor); |
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| 37 | static void dbgu_write_polled(int minor, char c); |
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| 38 | static int dbgu_set_attributes(int minor, const struct termios *t); |
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| 39 | |
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| 40 | /* Pointers to functions for handling the UART. */ |
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[359e537] | 41 | console_fns dbgu_fns = |
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| 42 | { |
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[af85485] | 43 | libchip_serial_default_probe, |
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| 44 | dbgu_first_open, |
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| 45 | dbgu_last_close, |
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| 46 | dbgu_read, |
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| 47 | dbgu_write, |
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| 48 | dbgu_init, |
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| 49 | dbgu_write_polled, /* not used in this driver */ |
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| 50 | dbgu_set_attributes, |
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| 51 | FALSE /* TRUE if interrupt driven, FALSE if not. */ |
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| 52 | }; |
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| 53 | /*********************************************************************/ |
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| 54 | /* Functions called via callbacks (i.e. the ones in uart_fns */ |
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| 55 | /*********************************************************************/ |
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| 56 | |
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[359e537] | 57 | /* |
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[af85485] | 58 | * This is called the first time each device is opened. Since |
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[359e537] | 59 | * the driver is polled, we don't have to do anything. If the driver |
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| 60 | * were interrupt driven, we'd enable interrupts here. |
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[af85485] | 61 | */ |
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[359e537] | 62 | static int dbgu_first_open(int major, int minor, void *arg) |
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[af85485] | 63 | { |
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| 64 | return 0; |
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| 65 | } |
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| 66 | |
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| 67 | |
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[359e537] | 68 | /* |
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[af85485] | 69 | * This is called the last time each device is closed. Since |
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[359e537] | 70 | * the driver is polled, we don't have to do anything. If the driver |
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| 71 | * were interrupt driven, we'd disable interrupts here. |
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[af85485] | 72 | */ |
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[359e537] | 73 | static int dbgu_last_close(int major, int minor, void *arg) |
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[af85485] | 74 | { |
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| 75 | return 0; |
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| 76 | } |
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| 77 | |
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| 78 | |
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| 79 | /* |
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| 80 | * Read one character from UART. |
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| 81 | * |
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| 82 | * return -1 if there's no data, otherwise return |
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| 83 | * the character in lowest 8 bits of returned int. |
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| 84 | */ |
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[359e537] | 85 | static int dbgu_read(int minor) |
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[af85485] | 86 | { |
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| 87 | char c; |
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| 88 | console_tbl *console_entry; |
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| 89 | at91rm9200_dbgu_regs_t *dbgu; |
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| 90 | |
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| 91 | console_entry = BSP_get_uart_from_minor(minor); |
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| 92 | |
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| 93 | if (console_entry == NULL) { |
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| 94 | return -1; |
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| 95 | } |
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| 96 | |
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| 97 | dbgu = (at91rm9200_dbgu_regs_t *)console_entry->ulCtrlPort1; |
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| 98 | |
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| 99 | if (!(dbgu->sr & DBGU_INT_RXRDY)) { |
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| 100 | return -1; |
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| 101 | } |
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[359e537] | 102 | |
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| 103 | c = dbgu->rhr & 0xff; |
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| 104 | |
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[af85485] | 105 | return c; |
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| 106 | } |
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| 107 | |
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| 108 | |
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[359e537] | 109 | /* |
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| 110 | * Write buffer to UART |
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[af85485] | 111 | * |
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| 112 | * return 1 on success, -1 on error |
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| 113 | */ |
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[ae3c037] | 114 | static ssize_t dbgu_write(int minor, const char *buf, size_t len) |
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[af85485] | 115 | { |
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| 116 | int i, x; |
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| 117 | char c; |
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| 118 | console_tbl *console_entry; |
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| 119 | at91rm9200_dbgu_regs_t *dbgu; |
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| 120 | |
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| 121 | console_entry = BSP_get_uart_from_minor(minor); |
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| 122 | |
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| 123 | if (console_entry == NULL) { |
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| 124 | return -1; |
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| 125 | } |
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| 126 | |
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| 127 | dbgu = (at91rm9200_dbgu_regs_t *)console_entry->ulCtrlPort1; |
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| 128 | |
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| 129 | for (i = 0; i < len; i++) { |
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| 130 | /* Wait for fifo to have room */ |
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| 131 | while(1) { |
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| 132 | if (dbgu->sr & DBGU_INT_TXRDY) { |
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| 133 | break; |
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| 134 | } |
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| 135 | } |
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[359e537] | 136 | |
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[af85485] | 137 | c = (char) buf[i]; |
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| 138 | dbgu->thr = c; |
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[359e537] | 139 | |
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[af85485] | 140 | /* the TXRDY flag does not seem to update right away (is this true?) */ |
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| 141 | /* so we wait a bit before continuing */ |
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| 142 | for (x = 0; x < 100; x++) { |
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| 143 | dbg_dly++; /* using a global so this doesn't get optimized out */ |
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| 144 | } |
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| 145 | } |
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[359e537] | 146 | |
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[af85485] | 147 | return 1; |
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| 148 | } |
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| 149 | |
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| 150 | |
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| 151 | /* Set up the UART. */ |
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| 152 | static void dbgu_init(int minor) |
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| 153 | { |
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| 154 | console_tbl *console_entry; |
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| 155 | at91rm9200_dbgu_regs_t *dbgu; |
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| 156 | |
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| 157 | console_entry = BSP_get_uart_from_minor(minor); |
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| 158 | |
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| 159 | if (console_entry == NULL) { |
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| 160 | return; |
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| 161 | } |
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| 162 | |
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| 163 | dbgu = (at91rm9200_dbgu_regs_t *)console_entry->ulCtrlPort1; |
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| 164 | |
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| 165 | /* Clear error bits, and reset */ |
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| 166 | dbgu->cr = (DBGU_CR_RSTSTA | DBGU_CR_RSTTX | DBGU_CR_RSTRX); |
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| 167 | |
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| 168 | /* Clear pending interrupts */ |
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| 169 | dbgu->idr = DBGU_INT_ALL; |
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| 170 | dbgu->imr = 0; |
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| 171 | |
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| 172 | /* Set port to no parity, no loopback */ |
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| 173 | dbgu->mr = DBGU_MR_PAR_NONE | DBGU_MR_CHMODE_NORM; |
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| 174 | |
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| 175 | /* Set the baud rate */ |
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| 176 | dbgu->brgr = (at91rm9200_get_mck() / 16) / BSP_get_baud(); |
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| 177 | |
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| 178 | /* Enable the DBGU */ |
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| 179 | dbgu->cr = (DBGU_CR_TXEN | DBGU_CR_RXEN); |
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| 180 | } |
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| 181 | |
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[9b623ee] | 182 | /* This is used for getchark support */ |
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[af85485] | 183 | static void dbgu_write_polled(int minor, char c) |
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| 184 | { |
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| 185 | dbgu_write(minor, &c, 1); |
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| 186 | } |
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| 187 | |
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| 188 | /* This is for setting baud rate, bits, etc. */ |
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[359e537] | 189 | static int dbgu_set_attributes(int minor, const struct termios *t) |
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[af85485] | 190 | { |
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| 191 | return 0; |
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| 192 | } |
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| 193 | |
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| 194 | /***********************************************************************/ |
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| 195 | /* |
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| 196 | * The following functions are not used by TERMIOS, but other RTEMS |
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| 197 | * functions use them instead. |
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| 198 | */ |
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| 199 | /***********************************************************************/ |
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[359e537] | 200 | /* |
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[af85485] | 201 | * Read from UART. This is used in the exit code, and can't |
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| 202 | * rely on interrupts. |
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| 203 | */ |
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| 204 | int dbgu_poll_read(int minor) |
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| 205 | { |
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| 206 | return dbgu_read(minor); |
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| 207 | } |
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| 208 | |
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| 209 | |
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| 210 | /* |
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[359e537] | 211 | * Write a character to the console. This is used by printk() and |
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[af85485] | 212 | * maybe other low level functions. It should not use interrupts or any |
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| 213 | * RTEMS system calls. It needs to be very simple |
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| 214 | */ |
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| 215 | static void _BSP_put_char( char c ) { |
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[3b8dfa66] | 216 | dbgu_write_polled(0, c); |
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| 217 | if ( c == '\n' ) |
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| 218 | dbgu_write_polled(0, '\r'); |
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[af85485] | 219 | } |
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| 220 | |
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[010d830] | 221 | BSP_output_char_function_type BSP_output_char = _BSP_put_char; |
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[af85485] | 222 | |
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[0e7cdc1e] | 223 | int _BSP_poll_char(void) |
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[9b623ee] | 224 | { |
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| 225 | return dbgu_poll_read(0); |
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| 226 | } |
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[af85485] | 227 | |
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[9b623ee] | 228 | BSP_polling_getchar_function_type BSP_poll_char = _BSP_poll_char; |
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