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 #if (!defined(CONFIG_SYS_NS16550_BROKEN_TEMT)) 40 while (!(serial_in(&com_port->lsr) & UART_LSR_TEMT)) 41 ; 42 #endif 43 44 serial_out(CONFIG_SYS_NS16550_IER, &com_port->ier); 45 #if (defined(CONFIG_OMAP) && !defined(CONFIG_OMAP3_ZOOM2)) || \ 46 defined(CONFIG_AM33XX) 47 serial_out(0x7, &com_port->mdr1); /* mode select reset TL16C750*/ 48 #endif 49 serial_out(UART_LCR_BKSE | UART_LCRVAL, (ulong)&com_port->lcr); 50 serial_out(0, &com_port->dll); 51 serial_out(0, &com_port->dlm); 52 serial_out(UART_LCRVAL, &com_port->lcr); 53 serial_out(UART_MCRVAL, &com_port->mcr); 54 serial_out(UART_FCRVAL, &com_port->fcr); 55 serial_out(UART_LCR_BKSE | UART_LCRVAL, &com_port->lcr); 56 serial_out(baud_divisor & 0xff, &com_port->dll); 57 serial_out((baud_divisor >> 8) & 0xff, &com_port->dlm); 58 serial_out(UART_LCRVAL, &com_port->lcr); 59 #if (defined(CONFIG_OMAP) && !defined(CONFIG_OMAP3_ZOOM2)) || \ 60 defined(CONFIG_AM33XX) || defined(CONFIG_SOC_DA8XX) 61 62 #if defined(CONFIG_APTIX) 63 /* /13 mode so Aptix 6MHz can hit 115200 */ 64 serial_out(3, &com_port->mdr1); 65 #else 66 /* /16 is proper to hit 115200 with 48MHz */ 67 serial_out(0, &com_port->mdr1); 68 #endif 69 #endif /* CONFIG_OMAP */ 70 } 71 72 #ifndef CONFIG_NS16550_MIN_FUNCTIONS 73 void NS16550_reinit(NS16550_t com_port, int baud_divisor) 74 { 75 serial_out(CONFIG_SYS_NS16550_IER, &com_port->ier); 76 serial_out(UART_LCR_BKSE | UART_LCRVAL, &com_port->lcr); 77 serial_out(0, &com_port->dll); 78 serial_out(0, &com_port->dlm); 79 serial_out(UART_LCRVAL, &com_port->lcr); 80 serial_out(UART_MCRVAL, &com_port->mcr); 81 serial_out(UART_FCRVAL, &com_port->fcr); 82 serial_out(UART_LCR_BKSE, &com_port->lcr); 83 serial_out(baud_divisor & 0xff, &com_port->dll); 84 serial_out((baud_divisor >> 8) & 0xff, &com_port->dlm); 85 serial_out(UART_LCRVAL, &com_port->lcr); 86 } 87 #endif /* CONFIG_NS16550_MIN_FUNCTIONS */ 88 89 void NS16550_putc(NS16550_t com_port, char c) 90 { 91 while ((serial_in(&com_port->lsr) & UART_LSR_THRE) == 0) 92 ; 93 serial_out(c, &com_port->thr); 94 95 /* 96 * Call watchdog_reset() upon newline. This is done here in putc 97 * since the environment code uses a single puts() to print the complete 98 * environment upon "printenv". So we can't put this watchdog call 99 * in puts(). 100 */ 101 if (c == '\n') 102 WATCHDOG_RESET(); 103 } 104 105 #ifndef CONFIG_NS16550_MIN_FUNCTIONS 106 char NS16550_getc(NS16550_t com_port) 107 { 108 while ((serial_in(&com_port->lsr) & UART_LSR_DR) == 0) { 109 #if !defined(CONFIG_SPL_BUILD) && defined(CONFIG_USB_TTY) 110 extern void usbtty_poll(void); 111 usbtty_poll(); 112 #endif 113 WATCHDOG_RESET(); 114 } 115 return serial_in(&com_port->rbr); 116 } 117 118 int NS16550_tstc(NS16550_t com_port) 119 { 120 return (serial_in(&com_port->lsr) & UART_LSR_DR) != 0; 121 } 122 123 #endif /* CONFIG_NS16550_MIN_FUNCTIONS */ 124