/* * COM1 NS16550 support * originally from linux source (arch/powerpc/boot/ns16550.c) * modified to use CONFIG_SYS_ISA_MEM and new defines */ #include <config.h> #include <ns16550.h> #include <watchdog.h> #include <linux/types.h> #include <asm/io.h> #define UART_LCRVAL UART_LCR_8N1 /* 8 data, 1 stop, no parity */ #define UART_MCRVAL (UART_MCR_DTR | \ UART_MCR_RTS) /* RTS/DTR */ #define UART_FCRVAL (UART_FCR_FIFO_EN | \ UART_FCR_RXSR | \ UART_FCR_TXSR) /* Clear & enable FIFOs */ #ifdef CONFIG_SYS_NS16550_PORT_MAPPED #define serial_out(x, y) outb(x, (ulong)y) #define serial_in(y) inb((ulong)y) #elif defined(CONFIG_SYS_NS16550_MEM32) && (CONFIG_SYS_NS16550_REG_SIZE > 0) #define serial_out(x, y) out_be32(y, x) #define serial_in(y) in_be32(y) #elif defined(CONFIG_SYS_NS16550_MEM32) && (CONFIG_SYS_NS16550_REG_SIZE < 0) #define serial_out(x, y) out_le32(y, x) #define serial_in(y) in_le32(y) #else #define serial_out(x, y) writeb(x, y) #define serial_in(y) readb(y) #endif #ifndef CONFIG_SYS_NS16550_IER #define CONFIG_SYS_NS16550_IER 0x00 #endif /* CONFIG_SYS_NS16550_IER */ void NS16550_init(NS16550_t com_port, int baud_divisor) { #if (defined(CONFIG_SPL_BUILD) && defined(CONFIG_OMAP34XX)) /* * On some OMAP3 devices when UART3 is configured for boot mode before * SPL starts only THRE bit is set. We have to empty the transmitter * before initialization starts. */ if ((serial_in(&com_port->lsr) & (UART_LSR_TEMT | UART_LSR_THRE)) == UART_LSR_THRE) { serial_out(UART_LCR_DLAB, &com_port->lcr); serial_out(baud_divisor & 0xff, &com_port->dll); serial_out((baud_divisor >> 8) & 0xff, &com_port->dlm); serial_out(UART_LCRVAL, &com_port->lcr); serial_out(0, &com_port->mdr1); } #endif while (!(serial_in(&com_port->lsr) & UART_LSR_TEMT)) ; serial_out(CONFIG_SYS_NS16550_IER, &com_port->ier); #if (defined(CONFIG_OMAP) && !defined(CONFIG_OMAP3_ZOOM2)) || \ defined(CONFIG_AM33XX) || defined(CONFIG_TI814X) serial_out(0x7, &com_port->mdr1); /* mode select reset TL16C750*/ #endif serial_out(UART_LCR_BKSE | UART_LCRVAL, &com_port->lcr); serial_out(0, &com_port->dll); serial_out(0, &com_port->dlm); serial_out(UART_LCRVAL, &com_port->lcr); serial_out(UART_MCRVAL, &com_port->mcr); serial_out(UART_FCRVAL, &com_port->fcr); serial_out(UART_LCR_BKSE | UART_LCRVAL, &com_port->lcr); serial_out(baud_divisor & 0xff, &com_port->dll); serial_out((baud_divisor >> 8) & 0xff, &com_port->dlm); serial_out(UART_LCRVAL, &com_port->lcr); #if (defined(CONFIG_OMAP) && !defined(CONFIG_OMAP3_ZOOM2)) || \ defined(CONFIG_AM33XX) || defined(CONFIG_SOC_DA8XX) || \ defined(CONFIG_TI814X) #if defined(CONFIG_APTIX) /* /13 mode so Aptix 6MHz can hit 115200 */ serial_out(3, &com_port->mdr1); #else /* /16 is proper to hit 115200 with 48MHz */ serial_out(0, &com_port->mdr1); #endif #endif /* CONFIG_OMAP */ } #ifndef CONFIG_NS16550_MIN_FUNCTIONS void NS16550_reinit(NS16550_t com_port, int baud_divisor) { serial_out(CONFIG_SYS_NS16550_IER, &com_port->ier); serial_out(UART_LCR_BKSE | UART_LCRVAL, &com_port->lcr); serial_out(0, &com_port->dll); serial_out(0, &com_port->dlm); serial_out(UART_LCRVAL, &com_port->lcr); serial_out(UART_MCRVAL, &com_port->mcr); serial_out(UART_FCRVAL, &com_port->fcr); serial_out(UART_LCR_BKSE, &com_port->lcr); serial_out(baud_divisor & 0xff, &com_port->dll); serial_out((baud_divisor >> 8) & 0xff, &com_port->dlm); serial_out(UART_LCRVAL, &com_port->lcr); } #endif /* CONFIG_NS16550_MIN_FUNCTIONS */ void NS16550_putc(NS16550_t com_port, char c) { while ((serial_in(&com_port->lsr) & UART_LSR_THRE) == 0) ; serial_out(c, &com_port->thr); /* * Call watchdog_reset() upon newline. This is done here in putc * since the environment code uses a single puts() to print the complete * environment upon "printenv". So we can't put this watchdog call * in puts(). */ if (c == '\n') WATCHDOG_RESET(); } #ifndef CONFIG_NS16550_MIN_FUNCTIONS char NS16550_getc(NS16550_t com_port) { while ((serial_in(&com_port->lsr) & UART_LSR_DR) == 0) { #if !defined(CONFIG_SPL_BUILD) && defined(CONFIG_USB_TTY) extern void usbtty_poll(void); usbtty_poll(); #endif WATCHDOG_RESET(); } return serial_in(&com_port->rbr); } int NS16550_tstc(NS16550_t com_port) { return (serial_in(&com_port->lsr) & UART_LSR_DR) != 0; } #endif /* CONFIG_NS16550_MIN_FUNCTIONS */