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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 | /* GRLIB APBUART Serial controller driver * * (C) Copyright 2007 * Daniel Hellstrom, Gaisler Research, daniel@gaisler.com. * * See file CREDITS for list of people who contributed to this * project. * * This program is free software; you can redistribute it and/or * modify it under the terms of the GNU General Public License as * published by the Free Software Foundation; either version 2 of * the License, or (at your option) any later version. * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. * * You should have received a copy of the GNU General Public License * along with this program; if not, write to the Free Software * Foundation, Inc., 59 Temple Place, Suite 330, Boston, * MA 02111-1307 USA * */ #include <common.h> #include <asm/processor.h> #include <asm/leon.h> #include <ambapp.h> DECLARE_GLOBAL_DATA_PTR; /* Force cache miss each time a serial controller reg is read */ #define CACHE_BYPASS 1 #ifdef CACHE_BYPASS #define READ_BYTE(var) SPARC_NOCACHE_READ_BYTE((unsigned int)&(var)) #define READ_HWORD(var) SPARC_NOCACHE_READ_HWORD((unsigned int)&(var)) #define READ_WORD(var) SPARC_NOCACHE_READ((unsigned int)&(var)) #define READ_DWORD(var) SPARC_NOCACHE_READ_DWORD((unsigned int)&(var)) #endif ambapp_dev_apbuart *leon3_apbuart = NULL; int serial_init(void) { ambapp_apbdev apbdev; unsigned int tmp; /* find UART */ if (ambapp_apb_first(VENDOR_GAISLER, GAISLER_APBUART, &apbdev) == 1) { leon3_apbuart = (ambapp_dev_apbuart *) apbdev.address; /* found apbuart, let's init... * * Set scaler / baud rate * * Receiver & transmitter enable */ leon3_apbuart->scaler = CFG_GRLIB_APBUART_SCALER; /* Let bit 11 be unchanged (debug bit for GRMON) */ tmp = READ_WORD(leon3_apbuart->ctrl); leon3_apbuart->ctrl = ((tmp & LEON_REG_UART_CTRL_DBG) | LEON_REG_UART_CTRL_RE | LEON_REG_UART_CTRL_TE); return 0; } return -1; /* didn't find hardware */ } void serial_putc(const char c) { if (c == '\n') serial_putc_raw('\r'); serial_putc_raw(c); } void serial_putc_raw(const char c) { if (!leon3_apbuart) return; /* Wait for last character to go. */ while (!(READ_WORD(leon3_apbuart->status) & LEON_REG_UART_STATUS_THE)) ; /* Send data */ leon3_apbuart->data = c; #ifdef LEON_DEBUG /* Wait for data to be sent */ while (!(READ_WORD(leon3_apbuart->status) & LEON_REG_UART_STATUS_TSE)) ; #endif } void serial_puts(const char *s) { while (*s) { serial_putc(*s++); } } int serial_getc(void) { if (!leon3_apbuart) return 0; /* Wait for a character to arrive. */ while (!(READ_WORD(leon3_apbuart->status) & LEON_REG_UART_STATUS_DR)) ; /* read data */ return READ_WORD(leon3_apbuart->data); } int serial_tstc(void) { if (leon3_apbuart) return (READ_WORD(leon3_apbuart->status) & LEON_REG_UART_STATUS_DR); return 0; } /* set baud rate for uart */ void serial_setbrg(void) { /* update baud rate settings, read it from gd->baudrate */ unsigned int scaler; if (leon3_apbuart && (gd->baudrate > 0)) { scaler = (((CONFIG_SYS_CLK_FREQ * 10) / (gd->baudrate * 8)) - 5) / 10; leon3_apbuart->scaler = scaler; } return; } |