1// SPDX-License-Identifier: GPL-2.0
 2/*
 3 * MPC5200 PSC serial console support.
 4 *
 5 * Author: Grant Likely <grant.likely@secretlab.ca>
 6 *
 7 * Copyright (c) 2007 Secret Lab Technologies Ltd.
 8 * Copyright (c) 2007 Freescale Semiconductor, Inc.
 9 *
10 * It is assumed that the firmware (or the platform file) has already set
11 * up the port.
12 */
13
14#include "types.h"
15#include "io.h"
16#include "ops.h"
17
18/* Programmable Serial Controller (PSC) status register bits */
19#define MPC52xx_PSC_SR		0x04
20#define MPC52xx_PSC_SR_RXRDY		0x0100
21#define MPC52xx_PSC_SR_RXFULL		0x0200
22#define MPC52xx_PSC_SR_TXRDY		0x0400
23#define MPC52xx_PSC_SR_TXEMP		0x0800
24
25#define MPC52xx_PSC_BUFFER	0x0C
26
27static void *psc;
28
29static int psc_open(void)
30{
31	/* Assume the firmware has already configured the PSC into
32	 * uart mode */
33	return 0;
34}
35
36static void psc_putc(unsigned char c)
37{
38	while (!(in_be16(psc + MPC52xx_PSC_SR) & MPC52xx_PSC_SR_TXRDY)) ;
39	out_8(psc + MPC52xx_PSC_BUFFER, c);
40}
41
42static unsigned char psc_tstc(void)
43{
44	return (in_be16(psc + MPC52xx_PSC_SR) & MPC52xx_PSC_SR_RXRDY) != 0;
45}
46
47static unsigned char psc_getc(void)
48{
49	while (!(in_be16(psc + MPC52xx_PSC_SR) & MPC52xx_PSC_SR_RXRDY)) ;
50	return in_8(psc + MPC52xx_PSC_BUFFER);
51}
52
53int mpc5200_psc_console_init(void *devp, struct serial_console_data *scdp)
54{
55	/* Get the base address of the psc registers */
56	if (dt_get_virtual_reg(devp, &psc, 1) < 1)
57		return -1;
58
59	scdp->open = psc_open;
60	scdp->putc = psc_putc;
61	scdp->getc = psc_getc;
62	scdp->tstc = psc_tstc;
63
64	return 0;
65}

 
 1/*
 2 * MPC5200 PSC serial console support.
 3 *
 4 * Author: Grant Likely <grant.likely@secretlab.ca>
 5 *
 6 * Copyright (c) 2007 Secret Lab Technologies Ltd.
 7 * Copyright (c) 2007 Freescale Semiconductor, Inc.
 8 *
 9 * It is assumed that the firmware (or the platform file) has already set
10 * up the port.
11 */
12
13#include "types.h"
14#include "io.h"
15#include "ops.h"
16
17/* Programmable Serial Controller (PSC) status register bits */
18#define MPC52xx_PSC_SR		0x04
19#define MPC52xx_PSC_SR_RXRDY		0x0100
20#define MPC52xx_PSC_SR_RXFULL		0x0200
21#define MPC52xx_PSC_SR_TXRDY		0x0400
22#define MPC52xx_PSC_SR_TXEMP		0x0800
23
24#define MPC52xx_PSC_BUFFER	0x0C
25
26static void *psc;
27
28static int psc_open(void)
29{
30	/* Assume the firmware has already configured the PSC into
31	 * uart mode */
32	return 0;
33}
34
35static void psc_putc(unsigned char c)
36{
37	while (!(in_be16(psc + MPC52xx_PSC_SR) & MPC52xx_PSC_SR_TXRDY)) ;
38	out_8(psc + MPC52xx_PSC_BUFFER, c);
39}
40
41static unsigned char psc_tstc(void)
42{
43	return (in_be16(psc + MPC52xx_PSC_SR) & MPC52xx_PSC_SR_RXRDY) != 0;
44}
45
46static unsigned char psc_getc(void)
47{
48	while (!(in_be16(psc + MPC52xx_PSC_SR) & MPC52xx_PSC_SR_RXRDY)) ;
49	return in_8(psc + MPC52xx_PSC_BUFFER);
50}
51
52int mpc5200_psc_console_init(void *devp, struct serial_console_data *scdp)
53{
54	/* Get the base address of the psc registers */
55	if (dt_get_virtual_reg(devp, &psc, 1) < 1)
56		return -1;
57
58	scdp->open = psc_open;
59	scdp->putc = psc_putc;
60	scdp->getc = psc_getc;
61	scdp->tstc = psc_tstc;
62
63	return 0;
64}