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 serial_out(0x7, &com_port->mdr1); /* mode select reset TL16C750*/ 42 #endif 43 serial_out(UART_LCR_BKSE | UART_LCRVAL, (ulong)&com_port->lcr); 44 serial_out(0, &com_port->dll); 45 serial_out(0, &com_port->dlm); 46 serial_out(UART_LCRVAL, &com_port->lcr); 47 serial_out(UART_MCRVAL, &com_port->mcr); 48 serial_out(UART_FCRVAL, &com_port->fcr); 49 serial_out(UART_LCR_BKSE | UART_LCRVAL, &com_port->lcr); 50 serial_out(baud_divisor & 0xff, &com_port->dll); 51 serial_out((baud_divisor >> 8) & 0xff, &com_port->dlm); 52 serial_out(UART_LCRVAL, &com_port->lcr); 53 #if defined(CONFIG_OMAP) && !defined(CONFIG_OMAP3_ZOOM2) 54 #if defined(CONFIG_APTIX) 55 serial_out(3, &com_port->mdr1); /* /13 mode so Aptix 6MHz can hit 115200 */ 56 #else 57 serial_out(0, &com_port->mdr1); /* /16 is proper to hit 115200 with 48MHz */ 58 #endif 59 #endif /* CONFIG_OMAP */ 60 } 61 62 #ifndef CONFIG_NS16550_MIN_FUNCTIONS 63 void NS16550_reinit (NS16550_t com_port, int baud_divisor) 64 { 65 serial_out(CONFIG_SYS_NS16550_IER, &com_port->ier); 66 serial_out(UART_LCR_BKSE | UART_LCRVAL, &com_port->lcr); 67 serial_out(0, &com_port->dll); 68 serial_out(0, &com_port->dlm); 69 serial_out(UART_LCRVAL, &com_port->lcr); 70 serial_out(UART_MCRVAL, &com_port->mcr); 71 serial_out(UART_FCRVAL, &com_port->fcr); 72 serial_out(UART_LCR_BKSE, &com_port->lcr); 73 serial_out(baud_divisor & 0xff, &com_port->dll); 74 serial_out((baud_divisor >> 8) & 0xff, &com_port->dlm); 75 serial_out(UART_LCRVAL, &com_port->lcr); 76 } 77 #endif /* CONFIG_NS16550_MIN_FUNCTIONS */ 78 79 void NS16550_putc (NS16550_t com_port, char c) 80 { 81 while ((serial_in(&com_port->lsr) & UART_LSR_THRE) == 0); 82 serial_out(c, &com_port->thr); 83 84 /* 85 * Call watchdog_reset() upon newline. This is done here in putc 86 * since the environment code uses a single puts() to print the complete 87 * environment upon "printenv". So we can't put this watchdog call 88 * in puts(). 89 */ 90 if (c == '\n') 91 WATCHDOG_RESET(); 92 } 93 94 #ifndef CONFIG_NS16550_MIN_FUNCTIONS 95 char NS16550_getc (NS16550_t com_port) 96 { 97 while ((serial_in(&com_port->lsr) & UART_LSR_DR) == 0) { 98 #ifdef CONFIG_USB_TTY 99 extern void usbtty_poll(void); 100 usbtty_poll(); 101 #endif 102 WATCHDOG_RESET(); 103 } 104 return serial_in(&com_port->rbr); 105 } 106 107 int NS16550_tstc (NS16550_t com_port) 108 { 109 return ((serial_in(&com_port->lsr) & UART_LSR_DR) != 0); 110 } 111 112 #endif /* CONFIG_NS16550_MIN_FUNCTIONS */ 113