| 1 | /* |
| 2 | * Jz47xx UART support |
| 3 | * |
| 4 | * Hardcoded to UART 0 for now |
| 5 | * Options also hardcoded to 8N1 |
| 6 | * |
| 7 | * Copyright (c) 2005 |
| 8 | * Ingenic Semiconductor, <jlwei@ingenic.cn> |
| 9 | * |
| 10 | * This program is free software; you can redistribute it and/or |
| 11 | * modify it under the terms of the GNU General Public License as |
| 12 | * published by the Free Software Foundation; either version 2 of |
| 13 | * the License, or (at your option) any later version. |
| 14 | * |
| 15 | * This program is distributed in the hope that it will be useful, |
| 16 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 17 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 18 | * GNU General Public License for more details. |
| 19 | * |
| 20 | * You should have received a copy of the GNU General Public License |
| 21 | * along with this program; if not, write to the Free Software |
| 22 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, |
| 23 | * MA 02111-1307 USA |
| 24 | */ |
| 25 | |
| 26 | #include <config.h> |
| 27 | |
| 28 | #if defined(CONFIG_JZ4740) |
| 29 | |
| 30 | #include <common.h> |
| 31 | |
| 32 | #include <asm/jz4740.h> |
| 33 | |
| 34 | #undef UART_BASE |
| 35 | #ifndef CONFIG_SYS_UART_BASE |
| 36 | #define UART_BASE UART0_BASE |
| 37 | #else |
| 38 | #define UART_BASE CONFIG_SYS_UART_BASE |
| 39 | #endif |
| 40 | |
| 41 | /****************************************************************************** |
| 42 | * |
| 43 | * serial_init - initialize a channel |
| 44 | * |
| 45 | * This routine initializes the number of data bits, parity |
| 46 | * and set the selected baud rate. Interrupts are disabled. |
| 47 | * Set the modem control signals if the option is selected. |
| 48 | * |
| 49 | * RETURNS: N/A |
| 50 | */ |
| 51 | |
| 52 | int serial_init (void) |
| 53 | { |
| 54 | #if !defined(CONFIG_NAND_U_BOOT) || defined(CONFIG_NAND_SPL) |
| 55 | volatile u8 *uart_fcr = (volatile u8 *)(UART_BASE + OFF_FCR); |
| 56 | volatile u8 *uart_lcr = (volatile u8 *)(UART_BASE + OFF_LCR); |
| 57 | volatile u8 *uart_ier = (volatile u8 *)(UART_BASE + OFF_IER); |
| 58 | volatile u8 *uart_sircr = (volatile u8 *)(UART_BASE + OFF_SIRCR); |
| 59 | |
| 60 | /* Disable port interrupts while changing hardware */ |
| 61 | *uart_ier = 0; |
| 62 | |
| 63 | /* Disable UART unit function */ |
| 64 | *uart_fcr = ~UART_FCR_UUE; |
| 65 | |
| 66 | /* Set both receiver and transmitter in UART mode (not SIR) */ |
| 67 | *uart_sircr = ~(SIRCR_RSIRE | SIRCR_TSIRE); |
| 68 | |
| 69 | /* Set databits, stopbits and parity. (8-bit data, 1 stopbit, no parity) */ |
| 70 | *uart_lcr = UART_LCR_WLEN_8 | UART_LCR_STOP_1; |
| 71 | |
| 72 | /* Set baud rate */ |
| 73 | serial_setbrg(); |
| 74 | |
| 75 | /* Enable UART unit, enable and clear FIFO */ |
| 76 | *uart_fcr = UART_FCR_UUE | UART_FCR_FE | UART_FCR_TFLS | UART_FCR_RFLS; |
| 77 | #endif |
| 78 | return 0; |
| 79 | } |
| 80 | |
| 81 | void serial_setbrg (void) |
| 82 | { |
| 83 | volatile u8 *uart_lcr = (volatile u8 *)(UART_BASE + OFF_LCR); |
| 84 | volatile u8 *uart_dlhr = (volatile u8 *)(UART_BASE + OFF_DLHR); |
| 85 | volatile u8 *uart_dllr = (volatile u8 *)(UART_BASE + OFF_DLLR); |
| 86 | u32 baud_div, tmp; |
| 87 | |
| 88 | baud_div = CONFIG_SYS_EXTAL / 16 / CONFIG_BAUDRATE; |
| 89 | |
| 90 | tmp = *uart_lcr; |
| 91 | tmp |= UART_LCR_DLAB; |
| 92 | *uart_lcr = tmp; |
| 93 | |
| 94 | *uart_dlhr = (baud_div >> 8) & 0xff; |
| 95 | *uart_dllr = baud_div & 0xff; |
| 96 | |
| 97 | tmp &= ~UART_LCR_DLAB; |
| 98 | *uart_lcr = tmp; |
| 99 | } |
| 100 | |
| 101 | void serial_putc (const char c) |
| 102 | { |
| 103 | volatile u8 *uart_lsr = (volatile u8 *)(UART_BASE + OFF_LSR); |
| 104 | volatile u8 *uart_tdr = (volatile u8 *)(UART_BASE + OFF_TDR); |
| 105 | |
| 106 | if (c == '\n') serial_putc ('\r'); |
| 107 | |
| 108 | /* Wait for fifo to shift out some bytes */ |
| 109 | while ( !((*uart_lsr & (UART_LSR_TDRQ | UART_LSR_TEMT)) == 0x60) ); |
| 110 | |
| 111 | *uart_tdr = (u8)c; |
| 112 | } |
| 113 | |
| 114 | void serial_puts (const char *s) |
| 115 | { |
| 116 | while (*s) { |
| 117 | serial_putc (*s++); |
| 118 | } |
| 119 | } |
| 120 | |
| 121 | int serial_getc (void) |
| 122 | { |
| 123 | volatile u8 *uart_rdr = (volatile u8 *)(UART_BASE + OFF_RDR); |
| 124 | |
| 125 | while (!serial_tstc()); |
| 126 | |
| 127 | return *uart_rdr; |
| 128 | } |
| 129 | |
| 130 | int serial_tstc (void) |
| 131 | { |
| 132 | volatile u8 *uart_lsr = (volatile u8 *)(UART_BASE + OFF_LSR); |
| 133 | |
| 134 | if (*uart_lsr & UART_LSR_DR) { |
| 135 | /* Data in rfifo */ |
| 136 | return (1); |
| 137 | } |
| 138 | return 0; |
| 139 | } |
| 140 | |
| 141 | #endif |
| 142 | |
