X-Git-Url: https://git.sur5r.net/?a=blobdiff_plain;f=drivers%2Fserial%2Fns16550.c;h=7f013ab33c511d41e2bcbdd47d2372b778d52f43;hb=64f4a6192f0670de2d9af98900b750a3e7bf8ce6;hp=2429464d89656f167480ba0efc4af7fb4584adf0;hpb=f743931f9b4d4e15c9bdfe726bef033ea1f1402c;p=u-boot diff --git a/drivers/serial/ns16550.c b/drivers/serial/ns16550.c index 2429464d89..7f013ab33c 100644 --- a/drivers/serial/ns16550.c +++ b/drivers/serial/ns16550.c @@ -1,71 +1,138 @@ /* * COM1 NS16550 support - * originally from linux source (arch/ppc/boot/ns16550.c) - * modified to use CFG_ISA_MEM and new defines + * originally from linux source (arch/powerpc/boot/ns16550.c) + * modified to use CONFIG_SYS_ISA_MEM and new defines */ #include - -#ifdef CFG_NS16550 - #include +#include +#include +#include -#define LCRVAL LCR_8N1 /* 8 data, 1 stop, no parity */ -#define MCRVAL (MCR_DTR | MCR_RTS) /* RTS/DTR */ -#define FCRVAL (FCR_FIFO_EN | FCR_RXSR | FCR_TXSR) /* Clear & enable FIFOs */ +#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 -void NS16550_init (NS16550_t com_port, int baud_divisor) +#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) { - com_port->ier = 0x00; -#ifdef CONFIG_OMAP - com_port->mdr1 = 0x7; /* mode select reset TL16C750*/ +#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 - com_port->lcr = LCR_BKSE | LCRVAL; - com_port->dll = baud_divisor & 0xff; - com_port->dlm = (baud_divisor >> 8) & 0xff; - com_port->lcr = LCRVAL; - com_port->mcr = MCRVAL; - com_port->fcr = FCRVAL; -#if defined(CONFIG_OMAP) + + 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) - com_port->mdr1 = 3; /* /13 mode so Aptix 6MHz can hit 115200 */ + /* /13 mode so Aptix 6MHz can hit 115200 */ + serial_out(3, &com_port->mdr1); #else - com_port->mdr1 = 0; /* /16 is proper to hit 115200 with 48MHz */ -#endif + /* /16 is proper to hit 115200 with 48MHz */ + serial_out(0, &com_port->mdr1); #endif +#endif /* CONFIG_OMAP */ } -void NS16550_reinit (NS16550_t com_port, int baud_divisor) +#ifndef CONFIG_NS16550_MIN_FUNCTIONS +void NS16550_reinit(NS16550_t com_port, int baud_divisor) { - com_port->ier = 0x00; - com_port->lcr = LCR_BKSE; - com_port->dll = baud_divisor & 0xff; - com_port->dlm = (baud_divisor >> 8) & 0xff; - com_port->lcr = LCRVAL; - com_port->mcr = MCRVAL; - com_port->fcr = FCRVAL; + 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) +void NS16550_putc(NS16550_t com_port, char c) { - while ((com_port->lsr & LSR_THRE) == 0); - com_port->thr = 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(); } -char NS16550_getc (NS16550_t com_port) +#ifndef CONFIG_NS16550_MIN_FUNCTIONS +char NS16550_getc(NS16550_t com_port) { - while ((com_port->lsr & LSR_DR) == 0) { -#ifdef CONFIG_USB_TTY + 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 (com_port->rbr); + return serial_in(&com_port->rbr); } -int NS16550_tstc (NS16550_t com_port) +int NS16550_tstc(NS16550_t com_port) { - return ((com_port->lsr & LSR_DR) != 0); + return (serial_in(&com_port->lsr) & UART_LSR_DR) != 0; } -#endif +#endif /* CONFIG_NS16550_MIN_FUNCTIONS */