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65 lines
1.5 KiB
65 lines
1.5 KiB
// 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 <[email protected]> |
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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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