serial.c
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/*
* Simple serial driver for Cogent motherboard serial ports
* for use during boot
*/
#include <common.h>
#include "serial.h"
#include <serial.h>
#include <linux/compiler.h>
DECLARE_GLOBAL_DATA_PTR;
#if (CMA_MB_CAPS & CMA_MB_CAP_SERPAR)
#if (defined(CONFIG_8xx) && defined(CONFIG_8xx_CONS_NONE)) || \
(defined(CONFIG_8260) && defined(CONFIG_CONS_NONE))
#if CONFIG_CONS_INDEX == 1
#define CMA_MB_SERIAL_BASE CMA_MB_SERIALA_BASE
#elif CONFIG_CONS_INDEX == 2
#define CMA_MB_SERIAL_BASE CMA_MB_SERIALB_BASE
#elif CONFIG_CONS_INDEX == 3 && (CMA_MB_CAPS & CMA_MB_CAP_SER2)
#define CMA_MB_SERIAL_BASE CMA_MB_SER2A_BASE
#elif CONFIG_CONS_INDEX == 4 && (CMA_MB_CAPS & CMA_MB_CAP_SER2)
#define CMA_MB_SERIAL_BASE CMA_MB_SER2B_BASE
#else
#error CONFIG_CONS_INDEX must be configured for Cogent motherboard serial
#endif
static int cogent_serial_init(void)
{
cma_mb_serial *mbsp = (cma_mb_serial *) CMA_MB_SERIAL_BASE;
cma_mb_reg_write (&mbsp->ser_ier, 0x00); /* turn off interrupts */
serial_setbrg ();
cma_mb_reg_write (&mbsp->ser_lcr, 0x03); /* 8 data, 1 stop, no parity */
cma_mb_reg_write (&mbsp->ser_mcr, 0x03); /* RTS/DTR */
cma_mb_reg_write (&mbsp->ser_fcr, 0x07); /* Clear & enable FIFOs */
return (0);
}
static void cogent_serial_setbrg(void)
{
cma_mb_serial *mbsp = (cma_mb_serial *) CMA_MB_SERIAL_BASE;
unsigned int divisor;
unsigned char lcr;
if ((divisor = br_to_div (gd->baudrate)) == 0)
divisor = DEFDIV;
lcr = cma_mb_reg_read (&mbsp->ser_lcr);
cma_mb_reg_write (&mbsp->ser_lcr, lcr | 0x80); /* Access baud rate(set DLAB) */
cma_mb_reg_write (&mbsp->ser_brl, divisor & 0xff);
cma_mb_reg_write (&mbsp->ser_brh, (divisor >> 8) & 0xff);
cma_mb_reg_write (&mbsp->ser_lcr, lcr); /* unset DLAB */
}
static void cogent_serial_putc(const char c)
{
cma_mb_serial *mbsp = (cma_mb_serial *) CMA_MB_SERIAL_BASE;
if (c == '\n')
serial_putc ('\r');
while ((cma_mb_reg_read (&mbsp->ser_lsr) & LSR_THRE) == 0);
cma_mb_reg_write (&mbsp->ser_thr, c);
}
static int cogent_serial_getc(void)
{
cma_mb_serial *mbsp = (cma_mb_serial *) CMA_MB_SERIAL_BASE;
while ((cma_mb_reg_read (&mbsp->ser_lsr) & LSR_DR) == 0);
return ((int) cma_mb_reg_read (&mbsp->ser_rhr) & 0x7f);
}
static int cogent_serial_tstc(void)
{
cma_mb_serial *mbsp = (cma_mb_serial *) CMA_MB_SERIAL_BASE;
return ((cma_mb_reg_read (&mbsp->ser_lsr) & LSR_DR) != 0);
}
static struct serial_device cogent_serial_drv = {
.name = "cogent_serial",
.start = cogent_serial_init,
.stop = NULL,
.setbrg = cogent_serial_setbrg,
.putc = cogent_serial_putc,
.puts = default_serial_puts,
.getc = cogent_serial_getc,
.tstc = cogent_serial_tstc,
};
void cogent_serial_initialize(void)
{
serial_register(&cogent_serial_drv);
}
__weak struct serial_device *default_serial_console(void)
{
return &cogent_serial_drv;
}
#endif /* CONS_NONE */
#if defined(CONFIG_CMD_KGDB) && \
defined(CONFIG_KGDB_NONE)
#if CONFIG_KGDB_INDEX == CONFIG_CONS_INDEX
#error Console and kgdb are on the same serial port - this is not supported
#endif
#if CONFIG_KGDB_INDEX == 1
#define CMA_MB_KGDB_SER_BASE CMA_MB_SERIALA_BASE
#elif CONFIG_KGDB_INDEX == 2
#define CMA_MB_KGDB_SER_BASE CMA_MB_SERIALB_BASE
#elif CONFIG_KGDB_INDEX == 3 && (CMA_MB_CAPS & CMA_MB_CAP_SER2)
#define CMA_MB_KGDB_SER_BASE CMA_MB_SER2A_BASE
#elif CONFIG_KGDB_INDEX == 4 && (CMA_MB_CAPS & CMA_MB_CAP_SER2)
#define CMA_MB_KGDB_SER_BASE CMA_MB_SER2B_BASE
#else
#error CONFIG_KGDB_INDEX must be configured for Cogent motherboard serial
#endif
void kgdb_serial_init (void)
{
cma_mb_serial *mbsp = (cma_mb_serial *) CMA_MB_KGDB_SER_BASE;
unsigned int divisor;
if ((divisor = br_to_div (CONFIG_KGDB_BAUDRATE)) == 0)
divisor = DEFDIV;
cma_mb_reg_write (&mbsp->ser_ier, 0x00); /* turn off interrupts */
cma_mb_reg_write (&mbsp->ser_lcr, 0x80); /* Access baud rate(set DLAB) */
cma_mb_reg_write (&mbsp->ser_brl, divisor & 0xff);
cma_mb_reg_write (&mbsp->ser_brh, (divisor >> 8) & 0xff);
cma_mb_reg_write (&mbsp->ser_lcr, 0x03); /* 8 data, 1 stop, no parity */
cma_mb_reg_write (&mbsp->ser_mcr, 0x03); /* RTS/DTR */
cma_mb_reg_write (&mbsp->ser_fcr, 0x07); /* Clear & enable FIFOs */
printf ("[on cma10x serial port B] ");
}
void putDebugChar (int c)
{
cma_mb_serial *mbsp = (cma_mb_serial *) CMA_MB_KGDB_SER_BASE;
while ((cma_mb_reg_read (&mbsp->ser_lsr) & LSR_THRE) == 0);
cma_mb_reg_write (&mbsp->ser_thr, c & 0xff);
}
void putDebugStr (const char *str)
{
while (*str != '\0') {
if (*str == '\n')
putDebugChar ('\r');
putDebugChar (*str++);
}
}
int getDebugChar (void)
{
cma_mb_serial *mbsp = (cma_mb_serial *) CMA_MB_KGDB_SER_BASE;
while ((cma_mb_reg_read (&mbsp->ser_lsr) & LSR_DR) == 0);
return ((int) cma_mb_reg_read (&mbsp->ser_rhr) & 0x7f);
}
void kgdb_interruptible (int yes)
{
cma_mb_serial *mbsp = (cma_mb_serial *) CMA_MB_KGDB_SER_BASE;
if (yes == 1) {
printf ("kgdb: turning serial ints on\n");
cma_mb_reg_write (&mbsp->ser_ier, 0xf);
} else {
printf ("kgdb: turning serial ints off\n");
cma_mb_reg_write (&mbsp->ser_ier, 0x0);
}
}
#endif /* KGDB && KGDB_NONE */
#endif /* CAPS & SERPAR */