arch/powerpc/cpu/mpc5xxx/serial.c

/*
 * (C) Copyright 2000 - 2003
 * Wolfgang Denk, DENX Software Engineering, wd@denx.de.
 *
 * SPDX-License-Identifier:	GPL-2.0+
 *
 * Hacked for MPC8260 by Murray.Jensen@cmst.csiro.au, 19-Oct-00, with
 * changes based on the file arch/powerpc/mbxboot/m8260_tty.c from the
 * Linux/PPC sources (m8260_tty.c had no copyright info in it).
 *
 * Martin Krause, 8 Jun 2006
 * Added SERIAL_MULTI support
 */

/*
 * Minimal serial functions needed to use one of the PSC ports
 * as serial console interface.
 */

#include <common.h>
#include <linux/compiler.h>
#include <mpc5xxx.h>
#include <serial.h>

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 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_PSC_CONSOLE2)

#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 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

int serial_init_dev (unsigned long dev_base)
{
	volatile struct mpc5xxx_psc *psc = (struct mpc5xxx_psc *)dev_base;
	unsigned long baseclk;
	int div;

	/* reset PSC */
	psc->command = PSC_SEL_MODE_REG_1;

	/* select clock sources */
	psc->psc_clock_select = 0;
	baseclk = (gd->arch.ipb_clk + 16) / 32;

	/* switch to UART mode */
	psc->sicr = 0;

	/* configure parity, bit length and so on */
	psc->mode = PSC_MODE_8_BITS | PSC_MODE_PARNONE;
	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_dev (unsigned long dev_base, const char c)
{
	volatile struct mpc5xxx_psc *psc = (struct mpc5xxx_psc *)dev_base;

	if (c == '\n')
		serial_putc_dev (dev_base, '\r');

	/* Wait for last character to go. */
	while (!(psc->psc_status & PSC_SR_TXEMP))
		;

	psc->psc_buffer_8 = c;
}

void serial_puts_dev (unsigned long dev_base, const char *s)
{
	while (*s) {
		serial_putc_dev (dev_base, *s++);
	}
}

int serial_getc_dev (unsigned long dev_base)
{
	volatile struct mpc5xxx_psc *psc = (struct mpc5xxx_psc *)dev_base;

	/* Wait for a character to arrive. */
	while (!(psc->psc_status & PSC_SR_RXRDY))
		;

	return psc->psc_buffer_8;
}

int serial_tstc_dev (unsigned long dev_base)
{
	volatile struct mpc5xxx_psc *psc = (struct mpc5xxx_psc *)dev_base;

	return (psc->psc_status & PSC_SR_RXRDY);
}

void serial_setbrg_dev (unsigned long dev_base)
{
	volatile struct mpc5xxx_psc *psc = (struct mpc5xxx_psc *)dev_base;
	unsigned long baseclk, div;

	baseclk = (gd->arch.ipb_clk + 16) / 32;

	/* set up UART divisor */
	div = (baseclk + (gd->baudrate/2)) / gd->baudrate;
	psc->ctur = (div >> 8) & 0xFF;
	psc->ctlr =  div & 0xff;
}

void serial_setrts_dev (unsigned long dev_base, int s)
{
	volatile struct mpc5xxx_psc *psc = (struct mpc5xxx_psc *)dev_base;

	if (s) {
		/* Assert RTS (become LOW) */
		psc->op1 = 0x1;
	}
	else {
		/* Negate RTS (become HIGH) */
		psc->op0 = 0x1;
	}
}

int serial_getcts_dev (unsigned long dev_base)
{
	volatile struct mpc5xxx_psc *psc = (struct mpc5xxx_psc *)dev_base;

	return (psc->ip & 0x1) ? 0 : 1;
}

int serial0_init(void)
{
	return (serial_init_dev(PSC_BASE));
}

void serial0_setbrg (void)
{
	serial_setbrg_dev(PSC_BASE);
}

void serial0_putc(const char c)
{
	serial_putc_dev(PSC_BASE,c);
}

void serial0_puts(const char *s)
{
	serial_puts_dev(PSC_BASE, s);
}

int serial0_getc(void)
{
	return(serial_getc_dev(PSC_BASE));
}

int serial0_tstc(void)
{
	return (serial_tstc_dev(PSC_BASE));
}

struct serial_device serial0_device =
{
	.name	= "serial0",
	.start	= serial0_init,
	.stop	= NULL,
	.setbrg	= serial0_setbrg,
	.getc	= serial0_getc,
	.tstc	= serial0_tstc,
	.putc	= serial0_putc,
	.puts	= serial0_puts,
};

__weak struct serial_device *default_serial_console(void)
{
	return &serial0_device;
}

#ifdef CONFIG_PSC_CONSOLE2
int serial1_init(void)
{
	return serial_init_dev(PSC_BASE2);
}

void serial1_setbrg(void)
{
	serial_setbrg_dev(PSC_BASE2);
}

void serial1_putc(const char c)
{
	serial_putc_dev(PSC_BASE2, c);
}

void serial1_puts(const char *s)
{
	serial_puts_dev(PSC_BASE2, s);
}

int serial1_getc(void)
{
	return serial_getc_dev(PSC_BASE2);
}

int serial1_tstc(void)
{
	return serial_tstc_dev(PSC_BASE2);
}

struct serial_device serial1_device =
{
	.name	= "serial1",
	.start	= serial1_init,
	.stop	= NULL,
	.setbrg	= serial1_setbrg,
	.getc	= serial1_getc,
	.tstc	= serial1_tstc,
	.putc	= serial1_putc,
	.puts	= serial1_puts,
};
#endif /* CONFIG_PSC_CONSOLE2 */

#endif /* CONFIG_PSC_CONSOLE */