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124 lines
2.4 KiB
124 lines
2.4 KiB
#include <linux/config.h>
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#include <linux/types.h>
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#include <asm/ibm4xx.h>
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#include <linux/kernel.h>
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#define LSR_DR 0x01 /* Data ready */
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#define LSR_OE 0x02 /* Overrun */
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#define LSR_PE 0x04 /* Parity error */
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#define LSR_FE 0x08 /* Framing error */
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#define LSR_BI 0x10 /* Break */
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#define LSR_THRE 0x20 /* Xmit holding register empty */
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#define LSR_TEMT 0x40 /* Xmitter empty */
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#define LSR_ERR 0x80 /* Error */
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#include <platforms/4xx/ibm_ocp.h>
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extern struct NS16550* COM_PORTS[];
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#ifndef NULL
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#define NULL 0x00
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#endif
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static volatile struct NS16550 *kgdb_debugport = NULL;
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volatile struct NS16550 *
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NS16550_init(int chan)
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{
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volatile struct NS16550 *com_port;
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int quot;
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#ifdef BASE_BAUD
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quot = BASE_BAUD / 9600;
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#else
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quot = 0x000c; /* 0xc = 9600 baud (on a pc) */
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#endif
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com_port = (struct NS16550 *) COM_PORTS[chan];
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com_port->lcr = 0x00;
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com_port->ier = 0xFF;
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com_port->ier = 0x00;
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com_port->lcr = com_port->lcr | 0x80; /* Access baud rate */
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com_port->dll = ( quot & 0x00ff ); /* 0xc = 9600 baud */
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com_port->dlm = ( quot & 0xff00 ) >> 8;
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com_port->lcr = 0x03; /* 8 data, 1 stop, no parity */
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com_port->mcr = 0x00; /* RTS/DTR */
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com_port->fcr = 0x07; /* Clear & enable FIFOs */
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return( com_port );
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}
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void
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NS16550_putc(volatile struct NS16550 *com_port, unsigned char c)
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{
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while ((com_port->lsr & LSR_THRE) == 0)
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;
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com_port->thr = c;
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return;
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}
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unsigned char
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NS16550_getc(volatile struct NS16550 *com_port)
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{
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while ((com_port->lsr & LSR_DR) == 0)
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;
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return (com_port->rbr);
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}
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unsigned char
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NS16550_tstc(volatile struct NS16550 *com_port)
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{
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return ((com_port->lsr & LSR_DR) != 0);
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}
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#if defined(CONFIG_KGDB_TTYS0)
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#define KGDB_PORT 0
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#elif defined(CONFIG_KGDB_TTYS1)
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#define KGDB_PORT 1
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#elif defined(CONFIG_KGDB_TTYS2)
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#define KGDB_PORT 2
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#elif defined(CONFIG_KGDB_TTYS3)
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#define KGDB_PORT 3
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#else
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#error "invalid kgdb_tty port"
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#endif
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void putDebugChar( unsigned char c )
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{
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if ( kgdb_debugport == NULL )
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kgdb_debugport = NS16550_init(KGDB_PORT);
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NS16550_putc( kgdb_debugport, c );
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}
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int getDebugChar( void )
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{
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if (kgdb_debugport == NULL)
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kgdb_debugport = NS16550_init(KGDB_PORT);
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return(NS16550_getc(kgdb_debugport));
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}
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void kgdb_interruptible(int enable)
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{
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return;
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}
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void putDebugString(char* str)
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{
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while (*str != '\0') {
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putDebugChar(*str);
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str++;
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}
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putDebugChar('\r');
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return;
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}
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void
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kgdb_map_scc(void)
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{
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printk("kgdb init \n");
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kgdb_debugport = NS16550_init(KGDB_PORT);
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}
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