1 // SPDX-License-Identifier: GPL-2.0+
2 /*
3 * Copyright 2014 Freescale Semiconductor
4 *
5 * Freescale T2080RDB board-specific CPLD controlling supports.
6 */
7
8 #include <config.h>
9 #include <command.h>
10 #include <linux/string.h>
11 #include <asm/io.h>
12 #include "cpld.h"
13
cpld_read(unsigned int reg)14 u8 cpld_read(unsigned int reg)
15 {
16 void *p = (void *)CFG_SYS_CPLD_BASE;
17
18 return in_8(p + reg);
19 }
20
cpld_write(unsigned int reg,u8 value)21 void cpld_write(unsigned int reg, u8 value)
22 {
23 void *p = (void *)CFG_SYS_CPLD_BASE;
24
25 out_8(p + reg, value);
26 }
27
28 /* Set the boot bank to the alternate bank */
cpld_set_altbank(void)29 void cpld_set_altbank(void)
30 {
31 u8 reg = CPLD_READ(flash_csr);
32
33 reg = (reg & ~CPLD_BANK_SEL_MASK) | CPLD_LBMAP_ALTBANK;
34 CPLD_WRITE(flash_csr, reg);
35 CPLD_WRITE(reset_ctl, CPLD_LBMAP_RESET);
36 }
37
38 /* Set the boot bank to the default bank */
cpld_set_defbank(void)39 void cpld_set_defbank(void)
40 {
41 u8 reg = CPLD_READ(flash_csr);
42
43 reg = (reg & ~CPLD_BANK_SEL_MASK) | CPLD_LBMAP_DFLTBANK;
44 CPLD_WRITE(flash_csr, reg);
45 CPLD_WRITE(reset_ctl, CPLD_LBMAP_RESET);
46 }
47
do_cpld(struct cmd_tbl * cmdtp,int flag,int argc,char * const argv[])48 int do_cpld(struct cmd_tbl *cmdtp, int flag, int argc, char *const argv[])
49 {
50 int rc = 0;
51
52 if (argc <= 1)
53 return cmd_usage(cmdtp);
54
55 if (strcmp(argv[1], "reset") == 0) {
56 if (strcmp(argv[2], "altbank") == 0)
57 cpld_set_altbank();
58 else
59 cpld_set_defbank();
60 } else {
61 rc = cmd_usage(cmdtp);
62 }
63
64 return rc;
65 }
66
67 U_BOOT_CMD(
68 cpld, CONFIG_SYS_MAXARGS, 1, do_cpld,
69 "Reset the board or alternate bank",
70 "reset: reset to default bank\n"
71 "cpld reset altbank: reset to alternate bank\n"
72 );
73