1 /*
2 * Copyright 2015 Freescale Semiconductor
3 *
4 * SPDX-License-Identifier: GPL-2.0+
5 *
6 * Freescale LS1043ARDB board-specific CPLD controlling supports.
7 */
8
9 #include <common.h>
10 #include <command.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 *)CONFIG_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 *)CONFIG_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 u16 reg = CPLD_CFG_RCW_SRC_NOR;
32 u8 reg4 = CPLD_READ(soft_mux_on);
33 u8 reg5 = (u8)(reg >> 1);
34 u8 reg6 = (u8)(reg & 1);
35 u8 reg7 = CPLD_READ(vbank);
36
37 cpld_rev_bit(®5);
38
39 CPLD_WRITE(soft_mux_on, reg4 | CPLD_SW_MUX_BANK_SEL | 1);
40
41 CPLD_WRITE(cfg_rcw_src1, reg5);
42 CPLD_WRITE(cfg_rcw_src2, reg6);
43
44 reg7 = (reg7 & ~CPLD_BANK_SEL_MASK) | CPLD_BANK_SEL_ALTBANK;
45 CPLD_WRITE(vbank, reg7);
46
47 CPLD_WRITE(system_rst, 1);
48 }
49
50 /* Set the boot bank to the default bank */
cpld_set_defbank(void)51 void cpld_set_defbank(void)
52 {
53 u16 reg = CPLD_CFG_RCW_SRC_NOR;
54 u8 reg4 = CPLD_READ(soft_mux_on);
55 u8 reg5 = (u8)(reg >> 1);
56 u8 reg6 = (u8)(reg & 1);
57
58 cpld_rev_bit(®5);
59
60 CPLD_WRITE(soft_mux_on, reg4 | CPLD_SW_MUX_BANK_SEL | 1);
61
62 CPLD_WRITE(cfg_rcw_src1, reg5);
63 CPLD_WRITE(cfg_rcw_src2, reg6);
64
65 CPLD_WRITE(vbank, 0);
66
67 CPLD_WRITE(system_rst, 1);
68 }
69
cpld_set_nand(void)70 void cpld_set_nand(void)
71 {
72 u16 reg = CPLD_CFG_RCW_SRC_NAND;
73 u8 reg5 = (u8)(reg >> 1);
74 u8 reg6 = (u8)(reg & 1);
75
76 cpld_rev_bit(®5);
77
78 CPLD_WRITE(soft_mux_on, 1);
79
80 CPLD_WRITE(cfg_rcw_src1, reg5);
81 CPLD_WRITE(cfg_rcw_src2, reg6);
82
83 CPLD_WRITE(system_rst, 1);
84 }
85
cpld_set_sd(void)86 void cpld_set_sd(void)
87 {
88 u16 reg = CPLD_CFG_RCW_SRC_SD;
89 u8 reg5 = (u8)(reg >> 1);
90 u8 reg6 = (u8)(reg & 1);
91
92 cpld_rev_bit(®5);
93
94 CPLD_WRITE(soft_mux_on, 1);
95
96 CPLD_WRITE(cfg_rcw_src1, reg5);
97 CPLD_WRITE(cfg_rcw_src2, reg6);
98
99 CPLD_WRITE(system_rst, 1);
100 }
101 #ifdef DEBUG
cpld_dump_regs(void)102 static void cpld_dump_regs(void)
103 {
104 printf("cpld_ver = %x\n", CPLD_READ(cpld_ver));
105 printf("cpld_ver_sub = %x\n", CPLD_READ(cpld_ver_sub));
106 printf("pcba_ver = %x\n", CPLD_READ(pcba_ver));
107 printf("soft_mux_on = %x\n", CPLD_READ(soft_mux_on));
108 printf("cfg_rcw_src1 = %x\n", CPLD_READ(cfg_rcw_src1));
109 printf("cfg_rcw_src2 = %x\n", CPLD_READ(cfg_rcw_src2));
110 printf("vbank = %x\n", CPLD_READ(vbank));
111 printf("sysclk_sel = %x\n", CPLD_READ(sysclk_sel));
112 printf("uart_sel = %x\n", CPLD_READ(uart_sel));
113 printf("sd1refclk_sel = %x\n", CPLD_READ(sd1refclk_sel));
114 printf("tdmclk_mux_sel = %x\n", CPLD_READ(tdmclk_mux_sel));
115 printf("sdhc_spics_sel = %x\n", CPLD_READ(sdhc_spics_sel));
116 printf("status_led = %x\n", CPLD_READ(status_led));
117 putc('\n');
118 }
119 #endif
120
cpld_rev_bit(unsigned char * value)121 void cpld_rev_bit(unsigned char *value)
122 {
123 u8 rev_val, val;
124 int i;
125
126 val = *value;
127 rev_val = val & 1;
128 for (i = 1; i <= 7; i++) {
129 val >>= 1;
130 rev_val <<= 1;
131 rev_val |= val & 1;
132 }
133
134 *value = rev_val;
135 }
136
do_cpld(cmd_tbl_t * cmdtp,int flag,int argc,char * const argv[])137 int do_cpld(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
138 {
139 int rc = 0;
140
141 if (argc <= 1)
142 return cmd_usage(cmdtp);
143
144 if (strcmp(argv[1], "reset") == 0) {
145 if (strcmp(argv[2], "altbank") == 0)
146 cpld_set_altbank();
147 else if (strcmp(argv[2], "nand") == 0)
148 cpld_set_nand();
149 else if (strcmp(argv[2], "sd") == 0)
150 cpld_set_sd();
151 else
152 cpld_set_defbank();
153 #ifdef DEBUG
154 } else if (strcmp(argv[1], "dump") == 0) {
155 cpld_dump_regs();
156 #endif
157 } else {
158 rc = cmd_usage(cmdtp);
159 }
160
161 return rc;
162 }
163
164 U_BOOT_CMD(
165 cpld, CONFIG_SYS_MAXARGS, 1, do_cpld,
166 "Reset the board or alternate bank",
167 "reset: reset to default bank\n"
168 "cpld reset altbank: reset to alternate bank\n"
169 "cpld reset nand: reset to boot from NAND flash\n"
170 "cpld reset sd: reset to boot from SD card\n"
171 #ifdef DEBUG
172 "cpld dump - display the CPLD registers\n"
173 #endif
174 );
175