66 lines
1.5 KiB
C
66 lines
1.5 KiB
C
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// SPDX-License-Identifier: GPL-2.0
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/*
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* MPC5200 PSC serial console support.
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*
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* Author: Grant Likely <grant.likely@secretlab.ca>
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*
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* Copyright (c) 2007 Secret Lab Technologies Ltd.
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* Copyright (c) 2007 Freescale Semiconductor, Inc.
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*
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* It is assumed that the firmware (or the platform file) has already set
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* up the port.
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*/
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#include "types.h"
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#include "io.h"
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#include "ops.h"
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/* Programmable Serial Controller (PSC) status register bits */
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#define MPC52xx_PSC_SR 0x04
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#define MPC52xx_PSC_SR_RXRDY 0x0100
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#define MPC52xx_PSC_SR_RXFULL 0x0200
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#define MPC52xx_PSC_SR_TXRDY 0x0400
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#define MPC52xx_PSC_SR_TXEMP 0x0800
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#define MPC52xx_PSC_BUFFER 0x0C
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static void *psc;
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static int psc_open(void)
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{
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/* Assume the firmware has already configured the PSC into
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* uart mode */
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return 0;
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}
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static void psc_putc(unsigned char c)
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{
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while (!(in_be16(psc + MPC52xx_PSC_SR) & MPC52xx_PSC_SR_TXRDY)) ;
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out_8(psc + MPC52xx_PSC_BUFFER, c);
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}
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static unsigned char psc_tstc(void)
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{
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return (in_be16(psc + MPC52xx_PSC_SR) & MPC52xx_PSC_SR_RXRDY) != 0;
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}
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static unsigned char psc_getc(void)
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{
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while (!(in_be16(psc + MPC52xx_PSC_SR) & MPC52xx_PSC_SR_RXRDY)) ;
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return in_8(psc + MPC52xx_PSC_BUFFER);
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}
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int mpc5200_psc_console_init(void *devp, struct serial_console_data *scdp)
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{
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/* Get the base address of the psc registers */
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if (dt_get_virtual_reg(devp, &psc, 1) < 1)
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return -1;
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scdp->open = psc_open;
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scdp->putc = psc_putc;
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scdp->getc = psc_getc;
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scdp->tstc = psc_tstc;
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return 0;
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}
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