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/*
* (C) Copyright 2000 - 2003
* Wolfgang Denk, DENX Software Engineering, wd@denx.de.
*
* See file CREDITS for list of people who contributed to this
* project.
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License as
* published by the Free Software Foundation; either version 2 of
* the License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston,
* MA 02111-1307 USA
*
* Hacked for MPC8260 by Murray.Jensen@cmst.csiro.au, 19-Oct-00, with
* changes based on the file arch/ppc/mbxboot/m8260_tty.c from the
* Linux/PPC sources (m8260_tty.c had no copyright info in it).
*/
/*
* Minimal serial functions needed to use one of the PSC ports
* as serial console interface.
*/
#include <common.h>
#include <mpc5xxx.h>
#if defined(CONFIG_PSC_CONSOLE)
#if CONFIG_PSC_CONSOLE == 1
#define PSC_BASE MPC5XXX_PSC1
#elif CONFIG_PSC_CONSOLE == 2
#define PSC_BASE MPC5XXX_PSC2
#elif CONFIG_PSC_CONSOLE == 3
#define PSC_BASE MPC5XXX_PSC3
#elif defined(CONFIG_MGT5100)
#error CONFIG_PSC_CONSOLE must be in 1, 2 or 3
#elif CONFIG_PSC_CONSOLE == 4
#define PSC_BASE MPC5XXX_PSC4
#elif CONFIG_PSC_CONSOLE == 5
#define PSC_BASE MPC5XXX_PSC5
#elif CONFIG_PSC_CONSOLE == 6
#define PSC_BASE MPC5XXX_PSC6
#else
#error CONFIG_PSC_CONSOLE must be in 1 ... 6
#endif
int serial_init (void)
{
DECLARE_GLOBAL_DATA_PTR;
volatile struct mpc5xxx_psc *psc = (struct mpc5xxx_psc *)PSC_BASE;
unsigned long baseclk;
int div;
/* reset PSC */
psc->command = PSC_SEL_MODE_REG_1;
/* select clock sources */
#if defined(CONFIG_MGT5100)
psc->psc_clock_select = 0xdd00;
baseclk = (CFG_MPC5XXX_CLKIN + 16) / 32;
#elif defined(CONFIG_MPC5200)
psc->psc_clock_select = 0;
baseclk = (gd->ipb_clk + 16) / 32;
#endif
/* switch to UART mode */
psc->sicr = 0;
/* configure parity, bit length and so on */
#if defined(CONFIG_MGT5100)
psc->mode = PSC_MODE_ERR | PSC_MODE_8_BITS | PSC_MODE_PARNONE;
#elif defined(CONFIG_MPC5200)
psc->mode = PSC_MODE_8_BITS | PSC_MODE_PARNONE;
#endif
psc->mode = PSC_MODE_ONE_STOP;
/* set up UART divisor */
div = (baseclk + (gd->baudrate/2)) / gd->baudrate;
psc->ctur = (div >> 8) & 0xff;
psc->ctlr = div & 0xff;
/* disable all interrupts */
psc->psc_imr = 0;
/* reset and enable Rx/Tx */
psc->command = PSC_RST_RX;
psc->command = PSC_RST_TX;
psc->command = PSC_RX_ENABLE | PSC_TX_ENABLE;
return (0);
}
void
serial_putc(const char c)
{
volatile struct mpc5xxx_psc *psc = (struct mpc5xxx_psc *)PSC_BASE;
if (c == '\n')
serial_putc('\r');
/* Wait for last character to go. */
while (!(psc->psc_status & PSC_SR_TXEMP))
;
psc->psc_buffer_8 = c;
}
void
serial_puts (const char *s)
{
while (*s) {
serial_putc (*s++);
}
}
int
serial_getc(void)
{
volatile struct mpc5xxx_psc *psc = (struct mpc5xxx_psc *)PSC_BASE;
/* Wait for a character to arrive. */
while (!(psc->psc_status & PSC_SR_RXRDY))
;
return psc->psc_buffer_8;
}
int
serial_tstc(void)
{
volatile struct mpc5xxx_psc *psc = (struct mpc5xxx_psc *)PSC_BASE;
return (psc->psc_status & PSC_SR_RXRDY);
}
void
serial_setbrg(void)
{
DECLARE_GLOBAL_DATA_PTR;
volatile struct mpc5xxx_psc *psc = (struct mpc5xxx_psc *)PSC_BASE;
unsigned long baseclk, div;
#if defined(CONFIG_MGT5100)
baseclk = CFG_MPC5XXX_CLKIN / 32;
#elif defined(CONFIG_MPC5200)
baseclk = gd->ipb_clk / 32;
#endif
/* set up UART divisor */
div = baseclk / gd->baudrate;
psc->ctur = div >> 8;
psc->ctlr = div & 0xff;
}
#endif /* CONFIG_PSC_CONSOLE */
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