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/*
* (C) Copyright 2003
* Martin Winistoerfer, martinwinistoerfer@gmx.ch.
*
* SPDX-License-Identifier: GPL-2.0+
*/
/*
* File: serial.c
*
* Discription: Serial interface driver for SCI1 and SCI2.
* Since this code will be called from ROM use
* only non-static local variables.
*
*/
#include <common.h>
#include <watchdog.h>
#include <command.h>
#include <mpc5xx.h>
#include <serial.h>
#include <linux/compiler.h>
DECLARE_GLOBAL_DATA_PTR;
/*
* Local functions
*/
static int ready_to_send(void)
{
volatile immap_t *immr = (immap_t *)CONFIG_SYS_IMMR;
volatile short status;
do {
#if defined(CONFIG_5xx_CONS_SCI1)
status = immr->im_qsmcm.qsmcm_sc1sr;
#else
status = immr->im_qsmcm.qsmcm_sc2sr;
#endif
#if defined(CONFIG_WATCHDOG)
reset_5xx_watchdog (immr);
#endif
} while ((status & SCI_TDRE) == 0);
return 1;
}
/*
* Minimal global serial functions needed to use one of the SCI modules.
*/
static int mpc5xx_serial_init(void)
{
volatile immap_t *immr = (immap_t *)CONFIG_SYS_IMMR;
serial_setbrg();
#if defined(CONFIG_5xx_CONS_SCI1)
/* 10-Bit, 1 start bit, 8 data bit, no parity, 1 stop bit */
immr->im_qsmcm.qsmcm_scc1r1 = SCI_M_10;
immr->im_qsmcm.qsmcm_scc1r1 = SCI_TE | SCI_RE;
#else
immr->im_qsmcm.qsmcm_scc2r1 = SCI_M_10;
immr->im_qsmcm.qsmcm_scc2r1 = SCI_TE | SCI_RE;
#endif
return 0;
}
static void mpc5xx_serial_putc(const char c)
{
volatile immap_t *immr = (immap_t *)CONFIG_SYS_IMMR;
/* Test for completition */
if(ready_to_send()) {
#if defined(CONFIG_5xx_CONS_SCI1)
immr->im_qsmcm.qsmcm_sc1dr = (short)c;
#else
immr->im_qsmcm.qsmcm_sc2dr = (short)c;
#endif
if(c == '\n') {
if(ready_to_send());
#if defined(CONFIG_5xx_CONS_SCI1)
immr->im_qsmcm.qsmcm_sc1dr = (short)'\r';
#else
immr->im_qsmcm.qsmcm_sc2dr = (short)'\r';
#endif
}
}
}
static int mpc5xx_serial_getc(void)
{
volatile immap_t *immr = (immap_t *)CONFIG_SYS_IMMR;
volatile short status;
unsigned char tmp;
/* New data ? */
do {
#if defined(CONFIG_5xx_CONS_SCI1)
status = immr->im_qsmcm.qsmcm_sc1sr;
#else
status = immr->im_qsmcm.qsmcm_sc2sr;
#endif
#if defined(CONFIG_WATCHDOG)
reset_5xx_watchdog (immr);
#endif
} while ((status & SCI_RDRF) == 0);
/* Read data */
#if defined(CONFIG_5xx_CONS_SCI1)
tmp = (unsigned char)(immr->im_qsmcm.qsmcm_sc1dr & SCI_SCXDR_MK);
#else
tmp = (unsigned char)( immr->im_qsmcm.qsmcm_sc2dr & SCI_SCXDR_MK);
#endif
return tmp;
}
static int mpc5xx_serial_tstc(void)
{
volatile immap_t *immr = (immap_t *)CONFIG_SYS_IMMR;
short status;
/* New data character ? */
#if defined(CONFIG_5xx_CONS_SCI1)
status = immr->im_qsmcm.qsmcm_sc1sr;
#else
status = immr->im_qsmcm.qsmcm_sc2sr;
#endif
return (status & SCI_RDRF);
}
static void mpc5xx_serial_setbrg(void)
{
volatile immap_t *immr = (immap_t *)CONFIG_SYS_IMMR;
short scxbr;
/* Set baudrate */
scxbr = (gd->cpu_clk / (32 * gd->baudrate));
#if defined(CONFIG_5xx_CONS_SCI1)
immr->im_qsmcm.qsmcm_scc1r0 = (scxbr & SCI_SCXBR_MK);
#else
immr->im_qsmcm.qsmcm_scc2r0 = (scxbr & SCI_SCXBR_MK);
#endif
}
static struct serial_device mpc5xx_serial_drv = {
.name = "mpc5xx_serial",
.start = mpc5xx_serial_init,
.stop = NULL,
.setbrg = mpc5xx_serial_setbrg,
.putc = mpc5xx_serial_putc,
.puts = default_serial_puts,
.getc = mpc5xx_serial_getc,
.tstc = mpc5xx_serial_tstc,
};
void mpc5xx_serial_initialize(void)
{
serial_register(&mpc5xx_serial_drv);
}
__weak struct serial_device *default_serial_console(void)
{
return &mpc5xx_serial_drv;
}
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