| 1 | /* |
| 2 | * Copyright (C) 2009 Qi Hardware Inc., |
| 3 | * Author: Xiangfu Liu <xiangfu@qi-hardware.com> |
| 4 | * |
| 5 | * This program is free software; you can redistribute it and/or |
| 6 | * modify it under the terms of the GNU General Public License |
| 7 | * version 3 as published by the Free Software Foundation. |
| 8 | * |
| 9 | * This program is distributed in the hope that it will be useful, |
| 10 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 11 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 12 | * GNU General Public License for more details. |
| 13 | * |
| 14 | * You should have received a copy of the GNU General Public License |
| 15 | * along with this program; if not, write to the Free Software |
| 16 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, |
| 17 | * Boston, MA 02110-1301, USA |
| 18 | */ |
| 19 | #include "jz4750.h" |
| 20 | |
| 21 | volatile u32 UART_BASE; |
| 22 | #define CONFIG_BAUDRATE 57600 |
| 23 | #define CFG_EXTAL 12000000 /* EXTAL freq must=12 MHz !! */ |
| 24 | |
| 25 | void serial_setbrg (void) |
| 26 | { |
| 27 | volatile u8 *uart_lcr = (volatile u8 *)(UART_BASE + OFF_LCR); |
| 28 | volatile u8 *uart_dlhr = (volatile u8 *)(UART_BASE + OFF_DLHR); |
| 29 | volatile u8 *uart_dllr = (volatile u8 *)(UART_BASE + OFF_DLLR); |
| 30 | u32 baud_div, tmp; |
| 31 | |
| 32 | baud_div = CFG_EXTAL / 16 / CONFIG_BAUDRATE; |
| 33 | tmp = *uart_lcr; |
| 34 | tmp |= UART_LCR_DLAB; |
| 35 | *uart_lcr = tmp; |
| 36 | |
| 37 | *uart_dlhr = (baud_div >> 8) & 0xff; |
| 38 | *uart_dllr = baud_div & 0xff; |
| 39 | |
| 40 | tmp &= ~UART_LCR_DLAB; |
| 41 | *uart_lcr = tmp; |
| 42 | } |
| 43 | |
| 44 | void serial_putc (const char c) |
| 45 | { |
| 46 | volatile u8 *uart_lsr = (volatile u8 *)(UART_BASE + OFF_LSR); |
| 47 | volatile u8 *uart_tdr = (volatile u8 *)(UART_BASE + OFF_TDR); |
| 48 | |
| 49 | if (c == '\n') serial_putc ('\r'); |
| 50 | |
| 51 | /* Wait for fifo to shift out some bytes */ |
| 52 | while ( !((*uart_lsr & (UART_LSR_TDRQ | UART_LSR_TEMT)) == 0x60) ); |
| 53 | |
| 54 | *uart_tdr = (u8)c; |
| 55 | } |
| 56 | |
| 57 | void serial_puts (const char *s) |
| 58 | { |
| 59 | while (*s) { |
| 60 | serial_putc (*s++); |
| 61 | } |
| 62 | } |
| 63 | |
| 64 | void serial_init(void) |
| 65 | { |
| 66 | volatile u8 *uart_fcr = (volatile u8 *)(UART_BASE + OFF_FCR); |
| 67 | volatile u8 *uart_lcr = (volatile u8 *)(UART_BASE + OFF_LCR); |
| 68 | volatile u8 *uart_ier = (volatile u8 *)(UART_BASE + OFF_IER); |
| 69 | volatile u8 *uart_sircr = (volatile u8 *)(UART_BASE + OFF_SIRCR); |
| 70 | |
| 71 | /* Disable port interrupts while changing hardware */ |
| 72 | *uart_ier = 0; |
| 73 | |
| 74 | /* Disable UART unit function */ |
| 75 | *uart_fcr = ~UART_FCR_UUE; |
| 76 | |
| 77 | /* Set both receiver and transmitter in UART mode (not SIR) */ |
| 78 | *uart_sircr = ~(SIRCR_RSIRE | SIRCR_TSIRE); |
| 79 | |
| 80 | /* Set databits, stopbits and parity. (8-bit data, 1 stopbit, no parity) */ |
| 81 | *uart_lcr = UART_LCR_WLEN_8 | UART_LCR_STOP_1; |
| 82 | |
| 83 | /* Set baud rate */ |
| 84 | serial_setbrg(); |
| 85 | |
| 86 | /* Enable UART unit, enable and clear FIFO */ |
| 87 | *uart_fcr = UART_FCR_UUE | UART_FCR_FE | UART_FCR_TFLS | UART_FCR_RFLS; |
| 88 | } |
| 89 | |
| 90 | void serial_put_hex(unsigned int d) |
| 91 | { |
| 92 | unsigned char c[12]; |
| 93 | char i; |
| 94 | for(i = 0; i < 8;i++) |
| 95 | { |
| 96 | c[i] = (d >> ((7 - i) * 4)) & 0xf; |
| 97 | if(c[i] < 10) |
| 98 | c[i] += 0x30; |
| 99 | else |
| 100 | c[i] += (0x41 - 10); |
| 101 | } |
| 102 | c[8] = '\n'; |
| 103 | c[9] = 0; |
| 104 | serial_puts(c); |
| 105 | } |
| 106 | |
