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