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https://github.com/brain-hackers/u-boot-brain
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![Peter Tyser](/assets/img/avatar_default.png)
__asm__ follows gcc's documented syntax and is generally more common than __asm. This change is only asthetic and should not affect functionality. Signed-off-by: Peter Tyser <ptyser@xes-inc.com>
246 lines
4.1 KiB
C
246 lines
4.1 KiB
C
#include <common.h>
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#include <ns16550.h>
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#include "short_types.h"
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#include "memio.h"
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#include "articiaS.h"
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DECLARE_GLOBAL_DATA_PTR;
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#ifndef CONFIG_SYS_NS16550
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static uint32 ComPort1;
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uint16 SerialEcho = 1;
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#define RECEIVER_HOLDING 0
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#define TRANSMITTER_HOLDING 0
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#define INTERRUPT_ENABLE 1
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#define INTERRUPT_STATUS 2
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#define FIFO_CONTROL 2
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#define LINE_CONTROL 3
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#define MODEM_CONTROL 4
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#define LINE_STATUS 5
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#define MODEM_STATUS 6
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#define SCRATCH_PAD 7
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#define DIVISOR_LATCH_LSB 0
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#define DIVISOR_LATCH_MSB 1
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#define PRESCALER_DIVISION 5
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#define COM_WRITE_BYTE(reg, byte) out_byte((ComPort1+reg), byte)
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#define COM_READ_BYTE(reg) in_byte((ComPort1+reg))
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static int serial_init_done = 0;
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void serial_init (void)
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{
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#if 0
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uint32 clock_divisor = 115200 / baudrate;
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uint8 cfg;
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uint8 a;
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uint16 devfn = 7 << 3;
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if (serial_init_done)
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return;
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/* Enter configuration mode */
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cfg = pci_read_cfg_byte (0, devfn, 0x85);
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pci_write_cfg_byte (0, devfn, 0x85, cfg | 0x02);
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/* Set serial port COM1 as 3F8 */
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out_byte (0x3F0, 0xE7);
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out_byte (0x3f1, 0xfe);
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/* Set serial port COM2 as 2F8 */
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out_byte (0x3f0, 0xe8);
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out_byte (0x3f1, 0xeb);
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/* Enable */
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out_byte (0x3f0, 0xe2);
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a = in_byte (0x3f1);
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a |= 0xc;
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out_byte (0x3f0, 0xe2);
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out_byte (0x3f1, a);
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/* Reset the configuration mode */
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pci_write_cfg_byte (0, devfn, 0x85, cfg);
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#endif
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ComPort1 = 0x3F8;
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/* Disable interrupts */
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COM_WRITE_BYTE (INTERRUPT_ENABLE, 0x00);
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/* Set baud rate */
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/* COM_WRITE_BYTE(LINE_CONTROL, 0x83); */
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/* COM_WRITE_BYTE(DIVISOR_LATCH_LSB, (uint8)(clock_divisor & 0xFF)); */
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/* COM_WRITE_BYTE(DIVISOR_LATCH_MSB, (uint8)(clock_divisor >> 8)); */
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/* __asm__("eieio"); */
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/* Set 8-N-1 */
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COM_WRITE_BYTE (LINE_CONTROL, 0x03);
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__asm__ ("eieio");
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/* Disable FIFO */
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COM_WRITE_BYTE (MODEM_CONTROL, 0x03);
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COM_WRITE_BYTE (FIFO_CONTROL, 0x07);
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__asm__ ("eieio");
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serial_init_done = 1;
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}
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extern int console_changed;
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void serial_putc (const char sendme)
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{
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if (sendme == '\n') {
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while ((in_byte (0x3FD) & 0x40) == 0);
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out_byte (0x3f8, 0x0D);
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}
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while ((in_byte (0x3FD) & 0x40) == 0);
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out_byte (0x3f8, sendme);
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}
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int serial_getc (void)
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{
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#if 0
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uint8 c;
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for (;;) {
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uint8 x = in_byte (0x3FD);
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if (x & 0x01)
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break;
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if (x & 0x0C)
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out_byte (0x3fd, 0x0c);
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}
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c = in_byte (0x3F8);
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return c;
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#else
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while ((in_byte (0x3FD) & 0x01) == 0) {
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if (console_changed != 0) {
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printf ("Console changed\n");
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console_changed = 0;
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return 0;
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}
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}
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return in_byte (0x3F8);
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#endif
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}
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int serial_tstc (void)
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{
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return (in_byte (0x03FD) & 0x01) != 0;
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}
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void serial_debug_putc (int c)
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{
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serial_puts ("DBG");
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serial_putc (c);
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serial_putc (0x0d);
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serial_putc (0x0A);
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}
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#else
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const NS16550_t Com0 = (NS16550_t) CONFIG_SYS_NS16550_COM1;
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const NS16550_t Com1 = (NS16550_t) CONFIG_SYS_NS16550_COM2;
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int serial_init (void)
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{
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uint32 clock_divisor = 115200 / gd->baudrate;
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NS16550_init (Com0, clock_divisor);
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/* NS16550_reinit(Com1, clock_divisor); */
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/* serial_puts("COM1: 3F8h initalized"); */
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return (0);
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}
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#if 0
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void serial_putc (const char c)
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{
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NS16550_putc (Com0, c);
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if (c == '\n')
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NS16550_putc (Com0, 0x0D);
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}
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int serial_getc (void)
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{
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return (int) NS16550_getc (Com0);
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}
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int serial_tstc (void)
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{
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return NS16550_tstc (Com0);
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}
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#else
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void serial_putc (const char sendme)
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{
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if (sendme == '\n') {
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while ((in_byte (0x3FD) & 0x40) == 0);
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out_byte (0x3f8, 0x0D);
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}
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while ((in_byte (0x3FD) & 0x40) == 0);
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out_byte (0x3f8, sendme);
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}
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extern int console_changed;
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int serial_getc (void)
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{
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#if 0
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uint8 c;
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for (;;) {
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uint8 x = in_byte (0x3FD);
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if (x & 0x01)
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break;
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if (x & 0x0C)
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out_byte (0x3fd, 0x0c);
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}
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c = in_byte (0x3F8);
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return c;
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#else
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while ((in_byte (0x3FD) & 0x01) == 0) {
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if (console_changed != 0) {
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console_changed = 0;
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return 0;
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}
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}
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return in_byte (0x3F8);
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#endif
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}
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int serial_tstc (void)
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{
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return (in_byte (0x03FD) & 0x01) != 0;
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}
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#endif
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#endif
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void serial_puts (const char *string)
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{
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while (*string)
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serial_putc (*string++);
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}
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void serial_setbrg (void)
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{
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uint32 clock_divisor = 115200 / gd->baudrate;
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NS16550_init (Com0, clock_divisor);
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}
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