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 #else 23 #define serial_out(x,y) writeb(x,y) 24 #define serial_in(y) readb(y) 25 #endif 26 27 #ifndef CONFIG_SYS_NS16550_IER 28 #define CONFIG_SYS_NS16550_IER 0x00 29 #endif /* CONFIG_SYS_NS16550_IER */ 30 31 void NS16550_init (NS16550_t com_port, int baud_divisor) 32 { 33 serial_out(CONFIG_SYS_NS16550_IER, &com_port->ier); 34 #if defined(CONFIG_OMAP) && !defined(CONFIG_OMAP3_ZOOM2) 35 serial_out(0x7, &com_port->mdr1); /* mode select reset TL16C750*/ 36 #endif 37 serial_out(UART_LCR_BKSE | UART_LCRVAL, (ulong)&com_port->lcr); 38 serial_out(0, &com_port->dll); 39 serial_out(0, &com_port->dlm); 40 serial_out(UART_LCRVAL, &com_port->lcr); 41 serial_out(UART_MCRVAL, &com_port->mcr); 42 serial_out(UART_FCRVAL, &com_port->fcr); 43 serial_out(UART_LCR_BKSE | UART_LCRVAL, &com_port->lcr); 44 serial_out(baud_divisor & 0xff, &com_port->dll); 45 serial_out((baud_divisor >> 8) & 0xff, &com_port->dlm); 46 serial_out(UART_LCRVAL, &com_port->lcr); 47 #if defined(CONFIG_OMAP) && !defined(CONFIG_OMAP3_ZOOM2) 48 #if defined(CONFIG_APTIX) 49 serial_out(3, &com_port->mdr1); /* /13 mode so Aptix 6MHz can hit 115200 */ 50 #else 51 serial_out(0, &com_port->mdr1); /* /16 is proper to hit 115200 with 48MHz */ 52 #endif 53 #endif /* CONFIG_OMAP */ 54 } 55 56 #ifndef CONFIG_NS16550_MIN_FUNCTIONS 57 void NS16550_reinit (NS16550_t com_port, int baud_divisor) 58 { 59 serial_out(CONFIG_SYS_NS16550_IER, &com_port->ier); 60 serial_out(UART_LCR_BKSE | UART_LCRVAL, &com_port->lcr); 61 serial_out(0, &com_port->dll); 62 serial_out(0, &com_port->dlm); 63 serial_out(UART_LCRVAL, &com_port->lcr); 64 serial_out(UART_MCRVAL, &com_port->mcr); 65 serial_out(UART_FCRVAL, &com_port->fcr); 66 serial_out(UART_LCR_BKSE, &com_port->lcr); 67 serial_out(baud_divisor & 0xff, &com_port->dll); 68 serial_out((baud_divisor >> 8) & 0xff, &com_port->dlm); 69 serial_out(UART_LCRVAL, &com_port->lcr); 70 } 71 #endif /* CONFIG_NS16550_MIN_FUNCTIONS */ 72 73 void NS16550_putc (NS16550_t com_port, char c) 74 { 75 while ((serial_in(&com_port->lsr) & UART_LSR_THRE) == 0); 76 serial_out(c, &com_port->thr); 77 78 /* 79 * Call watchdog_reset() upon newline. This is done here in putc 80 * since the environment code uses a single puts() to print the complete 81 * environment upon "printenv". So we can't put this watchdog call 82 * in puts(). 83 */ 84 if (c == '\n') 85 WATCHDOG_RESET(); 86 } 87 88 #ifndef CONFIG_NS16550_MIN_FUNCTIONS 89 char NS16550_getc (NS16550_t com_port) 90 { 91 while ((serial_in(&com_port->lsr) & UART_LSR_DR) == 0) { 92 #ifdef CONFIG_USB_TTY 93 extern void usbtty_poll(void); 94 usbtty_poll(); 95 #endif 96 WATCHDOG_RESET(); 97 } 98 return serial_in(&com_port->rbr); 99 } 100 101 int NS16550_tstc (NS16550_t com_port) 102 { 103 return ((serial_in(&com_port->lsr) & UART_LSR_DR) != 0); 104 } 105 106 #endif /* CONFIG_NS16550_MIN_FUNCTIONS */ 107