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