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