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u-boot/cpu/mpc5xxx/serial.c
Wolfgang Denk c12cffc543 Add support for CONFIG_SERIAL_MULTI on MPC5xxx 
Patch by Martin Krause, 8 Jun 2006

This patch supports two serial consoles on boards with
a MPC5xxx CPU. The console can be switched at runtime
by setting stdin, stdout and stderr to the desired serial
interface (serial0 or serial1). The PSCs to be used as
console port are definded by CONFIG_PSC_CONSOLE
and CONFIG_PSC_CONSOLE2.
See README.serial_multi for details.
2006-06-16 17:04:45 +02:00

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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).
*
* Martin Krause, 8 Jun 2006
* Added CONFIG_SERIAL_MULTI support
*/
/*
* Minimal serial functions needed to use one of the PSC ports
* as serial console interface.
*/
#include <common.h>
#include <mpc5xxx.h>
#if defined (CONFIG_SERIAL_MULTI)
#include <serial.h>
#endif
DECLARE_GLOBAL_DATA_PTR;
#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
#if defined(CONFIG_SERIAL_MULTI) && !defined(CONFIG_PSC_CONSOLE2)
#error you must define CONFIG_PSC_CONSOLE2 if CONFIG_SERIAL_MULTI is set
#endif
#if defined(CONFIG_SERIAL_MULTI)
#if CONFIG_PSC_CONSOLE2 == 1
#define PSC_BASE2 MPC5XXX_PSC1
#elif CONFIG_PSC_CONSOLE2 == 2
#define PSC_BASE2 MPC5XXX_PSC2
#elif CONFIG_PSC_CONSOLE2 == 3
#define PSC_BASE2 MPC5XXX_PSC3
#elif defined(CONFIG_MGT5100)
#error CONFIG_PSC_CONSOLE2 must be in 1, 2 or 3
#elif CONFIG_PSC_CONSOLE2 == 4
#define PSC_BASE2 MPC5XXX_PSC4
#elif CONFIG_PSC_CONSOLE2 == 5
#define PSC_BASE2 MPC5XXX_PSC5
#elif CONFIG_PSC_CONSOLE2 == 6
#define PSC_BASE2 MPC5XXX_PSC6
#else
#error CONFIG_PSC_CONSOLE2 must be in 1 ... 6
#endif
#endif /* CONFIG_SERIAL_MULTI */
#if defined(CONFIG_SERIAL_MULTI)
int serial_init_dev (unsigned long dev_base)
#else
int serial_init (void)
#endif
{
#if defined(CONFIG_SERIAL_MULTI)
volatile struct mpc5xxx_psc *psc = (struct mpc5xxx_psc *)dev_base;
#else
volatile struct mpc5xxx_psc *psc = (struct mpc5xxx_psc *)PSC_BASE;
#endif
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);
}
#if defined(CONFIG_SERIAL_MULTI)
void serial_putc_dev (unsigned long dev_base, const char c)
#else
void serial_putc(const char c)
#endif
{
#if defined(CONFIG_SERIAL_MULTI)
volatile struct mpc5xxx_psc *psc = (struct mpc5xxx_psc *)dev_base;
#else
volatile struct mpc5xxx_psc *psc = (struct mpc5xxx_psc *)PSC_BASE;
#endif
if (c == '\n')
#if defined(CONFIG_SERIAL_MULTI)
serial_putc_dev (dev_base, '\r');
#else
serial_putc('\r');
#endif
/* Wait for last character to go. */
while (!(psc->psc_status & PSC_SR_TXEMP))
;
psc->psc_buffer_8 = c;
}
#if defined(CONFIG_SERIAL_MULTI)
void serial_puts_dev (unsigned long dev_base, const char *s)
#else
void serial_puts (const char *s)
#endif
{
while (*s) {
#if defined(CONFIG_SERIAL_MULTI)
serial_putc_dev (dev_base, *s++);
#else
serial_putc (*s++);
#endif
}
}
#if defined(CONFIG_SERIAL_MULTI)
int serial_getc_dev (unsigned long dev_base)
#else
int serial_getc(void)
#endif
{
#if defined(CONFIG_SERIAL_MULTI)
volatile struct mpc5xxx_psc *psc = (struct mpc5xxx_psc *)dev_base;
#else
volatile struct mpc5xxx_psc *psc = (struct mpc5xxx_psc *)PSC_BASE;
#endif
/* Wait for a character to arrive. */
while (!(psc->psc_status & PSC_SR_RXRDY))
;
return psc->psc_buffer_8;
}
#if defined(CONFIG_SERIAL_MULTI)
int serial_tstc_dev (unsigned long dev_base)
#else
int serial_tstc(void)
#endif
{
#if defined(CONFIG_SERIAL_MULTI)
volatile struct mpc5xxx_psc *psc = (struct mpc5xxx_psc *)dev_base;
#else
volatile struct mpc5xxx_psc *psc = (struct mpc5xxx_psc *)PSC_BASE;
#endif
return (psc->psc_status & PSC_SR_RXRDY);
}
#if defined(CONFIG_SERIAL_MULTI)
void serial_setbrg_dev (unsigned long dev_base)
#else
void serial_setbrg(void)
#endif
{
#if defined(CONFIG_SERIAL_MULTI)
volatile struct mpc5xxx_psc *psc = (struct mpc5xxx_psc *)dev_base;
#else
volatile struct mpc5xxx_psc *psc = (struct mpc5xxx_psc *)PSC_BASE;
#endif
unsigned long baseclk, div;
#if defined(CONFIG_MGT5100)
baseclk = (CFG_MPC5XXX_CLKIN + 16) / 32;
#elif defined(CONFIG_MPC5200)
baseclk = (gd->ipb_clk + 16) / 32;
#endif
/* set up UART divisor */
div = (baseclk + (gd->baudrate/2)) / gd->baudrate;
psc->ctur = (div >> 8) & 0xFF;
psc->ctlr = div & 0xff;
}
#if defined(CONFIG_SERIAL_MULTI)
int serial0_init(void)
{
return (serial_init_dev(PSC_BASE));
}
int serial1_init(void)
{
return (serial_init_dev(PSC_BASE2));
}
void serial0_setbrg (void)
{
serial_setbrg_dev(PSC_BASE);
}
void serial1_setbrg (void)
{
serial_setbrg_dev(PSC_BASE2);
}
void serial0_putc(const char c)
{
serial_putc_dev(PSC_BASE,c);
}
void serial1_putc(const char c)
{
serial_putc_dev(PSC_BASE2, c);
}
void serial0_puts(const char *s)
{
serial_puts_dev(PSC_BASE, s);
}
void serial1_puts(const char *s)
{
serial_puts_dev(PSC_BASE2, s);
}
int serial0_getc(void)
{
return(serial_getc_dev(PSC_BASE));
}
int serial1_getc(void)
{
return(serial_getc_dev(PSC_BASE2));
}
int serial0_tstc(void)
{
return (serial_tstc_dev(PSC_BASE));
}
int serial1_tstc(void)
{
return (serial_tstc_dev(PSC_BASE2));
}
struct serial_device serial0_device =
{
"serial0",
"UART0",
serial0_init,
serial0_setbrg,
serial0_getc,
serial0_tstc,
serial0_putc,
serial0_puts,
};
struct serial_device serial1_device =
{
"serial1",
"UART1",
serial1_init,
serial1_setbrg,
serial1_getc,
serial1_tstc,
serial1_putc,
serial1_puts,
};
#endif /* CONFIG_SERIAL_MULTI */
#endif /* CONFIG_PSC_CONSOLE */
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