1 /* 2 * COM1 NS16550 support 3 * originally from linux source (arch/powerpc/boot/ns16550.c) 4 * modified to use CONFIG_SYS_ISA_MEM and new defines 5 */ 6 7 #include <config.h> 8 #include <ns16550.h> 9 #include <watchdog.h> 10 #include <linux/types.h> 11 #include <asm/io.h> 12 13 #define UART_LCRVAL UART_LCR_8N1 /* 8 data, 1 stop, no parity */ 14 #define UART_MCRVAL (UART_MCR_DTR | \ 15 UART_MCR_RTS) /* RTS/DTR */ 16 #define UART_FCRVAL (UART_FCR_FIFO_EN | \ 17 UART_FCR_RXSR | \ 18 UART_FCR_TXSR) /* Clear & enable FIFOs */ 19 #ifdef CONFIG_SYS_NS16550_PORT_MAPPED 20 #define serial_out(x, y) outb(x, (ulong)y) 21 #define serial_in(y) inb((ulong)y) 22 #elif defined(CONFIG_SYS_NS16550_MEM32) && (CONFIG_SYS_NS16550_REG_SIZE > 0) 23 #define serial_out(x, y) out_be32(y, x) 24 #define serial_in(y) in_be32(y) 25 #elif defined(CONFIG_SYS_NS16550_MEM32) && (CONFIG_SYS_NS16550_REG_SIZE < 0) 26 #define serial_out(x, y) out_le32(y, x) 27 #define serial_in(y) in_le32(y) 28 #else 29 #define serial_out(x, y) writeb(x, y) 30 #define serial_in(y) readb(y) 31 #endif 32 33 #ifndef CONFIG_SYS_NS16550_IER 34 #define CONFIG_SYS_NS16550_IER 0x00 35 #endif /* CONFIG_SYS_NS16550_IER */ 36 37 void NS16550_init(NS16550_t com_port, int baud_divisor) 38 { 39 serial_out(CONFIG_SYS_NS16550_IER, &com_port->ier); 40 #if (defined(CONFIG_OMAP) && !defined(CONFIG_OMAP3_ZOOM2)) || \ 41 defined(CONFIG_AM33XX) 42 serial_out(0x7, &com_port->mdr1); /* mode select reset TL16C750*/ 43 #endif 44 serial_out(UART_LCR_BKSE | UART_LCRVAL, (ulong)&com_port->lcr); 45 serial_out(0, &com_port->dll); 46 serial_out(0, &com_port->dlm); 47 serial_out(UART_LCRVAL, &com_port->lcr); 48 serial_out(UART_MCRVAL, &com_port->mcr); 49 serial_out(UART_FCRVAL, &com_port->fcr); 50 serial_out(UART_LCR_BKSE | UART_LCRVAL, &com_port->lcr); 51 serial_out(baud_divisor & 0xff, &com_port->dll); 52 serial_out((baud_divisor >> 8) & 0xff, &com_port->dlm); 53 serial_out(UART_LCRVAL, &com_port->lcr); 54 #if (defined(CONFIG_OMAP) && !defined(CONFIG_OMAP3_ZOOM2)) || \ 55 defined(CONFIG_AM33XX) 56 57 #if defined(CONFIG_APTIX) 58 /* /13 mode so Aptix 6MHz can hit 115200 */ 59 serial_out(3, &com_port->mdr1); 60 #else 61 /* /16 is proper to hit 115200 with 48MHz */ 62 serial_out(0, &com_port->mdr1); 63 #endif 64 #endif /* CONFIG_OMAP */ 65 } 66 67 #ifndef CONFIG_NS16550_MIN_FUNCTIONS 68 void NS16550_reinit(NS16550_t com_port, int baud_divisor) 69 { 70 serial_out(CONFIG_SYS_NS16550_IER, &com_port->ier); 71 serial_out(UART_LCR_BKSE | UART_LCRVAL, &com_port->lcr); 72 serial_out(0, &com_port->dll); 73 serial_out(0, &com_port->dlm); 74 serial_out(UART_LCRVAL, &com_port->lcr); 75 serial_out(UART_MCRVAL, &com_port->mcr); 76 serial_out(UART_FCRVAL, &com_port->fcr); 77 serial_out(UART_LCR_BKSE, &com_port->lcr); 78 serial_out(baud_divisor & 0xff, &com_port->dll); 79 serial_out((baud_divisor >> 8) & 0xff, &com_port->dlm); 80 serial_out(UART_LCRVAL, &com_port->lcr); 81 } 82 #endif /* CONFIG_NS16550_MIN_FUNCTIONS */ 83 84 void NS16550_putc(NS16550_t com_port, char c) 85 { 86 while ((serial_in(&com_port->lsr) & UART_LSR_THRE) == 0) 87 ; 88 serial_out(c, &com_port->thr); 89 90 /* 91 * Call watchdog_reset() upon newline. This is done here in putc 92 * since the environment code uses a single puts() to print the complete 93 * environment upon "printenv". So we can't put this watchdog call 94 * in puts(). 95 */ 96 if (c == '\n') 97 WATCHDOG_RESET(); 98 } 99 100 #ifndef CONFIG_NS16550_MIN_FUNCTIONS 101 char NS16550_getc(NS16550_t com_port) 102 { 103 while ((serial_in(&com_port->lsr) & UART_LSR_DR) == 0) { 104 #ifdef CONFIG_USB_TTY 105 extern void usbtty_poll(void); 106 usbtty_poll(); 107 #endif 108 WATCHDOG_RESET(); 109 } 110 return serial_in(&com_port->rbr); 111 } 112 113 int NS16550_tstc(NS16550_t com_port) 114 { 115 return (serial_in(&com_port->lsr) & UART_LSR_DR) != 0; 116 } 117 118 #endif /* CONFIG_NS16550_MIN_FUNCTIONS */ 119