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b2441318 | 1 | // SPDX-License-Identifier: GPL-2.0 |
85498ae8 GL |
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 | ||
27 | static void *psc; | |
28 | ||
29 | static int psc_open(void) | |
30 | { | |
31 | /* Assume the firmware has already configured the PSC into | |
32 | * uart mode */ | |
33 | return 0; | |
34 | } | |
35 | ||
36 | static 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 | ||
42 | static unsigned char psc_tstc(void) | |
43 | { | |
44 | return (in_be16(psc + MPC52xx_PSC_SR) & MPC52xx_PSC_SR_RXRDY) != 0; | |
45 | } | |
46 | ||
47 | static 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 | ||
53 | int mpc5200_psc_console_init(void *devp, struct serial_console_data *scdp) | |
54 | { | |
85498ae8 | 55 | /* Get the base address of the psc registers */ |
da0a5f0c LP |
56 | if (dt_get_virtual_reg(devp, &psc, 1) < 1) |
57 | return -1; | |
85498ae8 GL |
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 | } |