3 * originally from linux source (arch/powerpc/boot/ns16550.c)
4 * modified to use CONFIG_SYS_ISA_MEM and new defines
10 #include <linux/types.h>
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 | \
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)
29 #define serial_out(x, y) writeb(x, y)
30 #define serial_in(y) readb(y)
33 #ifndef CONFIG_SYS_NS16550_IER
34 #define CONFIG_SYS_NS16550_IER 0x00
35 #endif /* CONFIG_SYS_NS16550_IER */
37 void NS16550_init(NS16550_t com_port, int baud_divisor)
39 #if (!defined(CONFIG_SYS_NS16550_BROKEN_TEMT))
40 while (!(serial_in(&com_port->lsr) & UART_LSR_TEMT))
44 serial_out(CONFIG_SYS_NS16550_IER, &com_port->ier);
45 #if (defined(CONFIG_OMAP) && !defined(CONFIG_OMAP3_ZOOM2)) || \
46 defined(CONFIG_AM33XX) || defined(CONFIG_TI814X)
47 serial_out(0x7, &com_port->mdr1); /* mode select reset TL16C750*/
49 serial_out(UART_LCR_BKSE | UART_LCRVAL, &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 defined(CONFIG_TI814X)
63 #if defined(CONFIG_APTIX)
64 /* /13 mode so Aptix 6MHz can hit 115200 */
65 serial_out(3, &com_port->mdr1);
67 /* /16 is proper to hit 115200 with 48MHz */
68 serial_out(0, &com_port->mdr1);
70 #endif /* CONFIG_OMAP */
73 #ifndef CONFIG_NS16550_MIN_FUNCTIONS
74 void NS16550_reinit(NS16550_t com_port, int baud_divisor)
76 serial_out(CONFIG_SYS_NS16550_IER, &com_port->ier);
77 serial_out(UART_LCR_BKSE | UART_LCRVAL, &com_port->lcr);
78 serial_out(0, &com_port->dll);
79 serial_out(0, &com_port->dlm);
80 serial_out(UART_LCRVAL, &com_port->lcr);
81 serial_out(UART_MCRVAL, &com_port->mcr);
82 serial_out(UART_FCRVAL, &com_port->fcr);
83 serial_out(UART_LCR_BKSE, &com_port->lcr);
84 serial_out(baud_divisor & 0xff, &com_port->dll);
85 serial_out((baud_divisor >> 8) & 0xff, &com_port->dlm);
86 serial_out(UART_LCRVAL, &com_port->lcr);
88 #endif /* CONFIG_NS16550_MIN_FUNCTIONS */
90 void NS16550_putc(NS16550_t com_port, char c)
92 while ((serial_in(&com_port->lsr) & UART_LSR_THRE) == 0)
94 serial_out(c, &com_port->thr);
97 * Call watchdog_reset() upon newline. This is done here in putc
98 * since the environment code uses a single puts() to print the complete
99 * environment upon "printenv". So we can't put this watchdog call
106 #ifndef CONFIG_NS16550_MIN_FUNCTIONS
107 char NS16550_getc(NS16550_t com_port)
109 while ((serial_in(&com_port->lsr) & UART_LSR_DR) == 0) {
110 #if !defined(CONFIG_SPL_BUILD) && defined(CONFIG_USB_TTY)
111 extern void usbtty_poll(void);
116 return serial_in(&com_port->rbr);
119 int NS16550_tstc(NS16550_t com_port)
121 return (serial_in(&com_port->lsr) & UART_LSR_DR) != 0;
124 #endif /* CONFIG_NS16550_MIN_FUNCTIONS */