board/freescale/t4rdb/cpld.c

   1 // SPDX-License-Identifier: GPL-2.0+
   2 /**
   3  * Copyright 2014 Freescale Semiconductor
   4  *
   5  * Author: Chunhe Lan <Chunhe.Lan@freescale.com>
   6  *
   7  * This file provides support for the board-specific CPLD used on some Freescale
   8  * reference boards.
   9  *
  10  * The following macros need to be defined:
  11  *
  12  * CONFIG_SYS_CPLD_BASE - The virtual address of the base of the
  13  * CPLD register map
  14  *
  15  */
  16
  17 #include <common.h>
  18 #include <command.h>
  19 #include <asm/io.h>
  20
  21 #include "cpld.h"
  22
  23 u8 cpld_read(unsigned int reg)
  24 {
  25         void *p = (void *)CONFIG_SYS_CPLD_BASE;
  26
  27         return in_8(p + reg);
  28 }
  29
  30 void cpld_write(unsigned int reg, u8 value)
  31 {
  32         void *p = (void *)CONFIG_SYS_CPLD_BASE;
  33
  34         out_8(p + reg, value);
  35 }
  36
  37 /**
  38  * Set the boot bank to the alternate bank
  39  */
  40 void cpld_set_altbank(void)
  41 {
  42         u8 val, curbank, altbank, override;
  43
  44         val = CPLD_READ(vbank);
  45         curbank = val & CPLD_BANK_SEL_MASK;
  46
  47         switch (curbank) {
  48         case CPLD_SELECT_BANK0:
  49         case CPLD_SELECT_BANK4:
  50                 altbank = CPLD_SELECT_BANK4;
  51                 CPLD_WRITE(vbank, altbank);
  52                 override = CPLD_READ(software_on);
  53                 CPLD_WRITE(software_on, override | CPLD_BANK_SEL_EN);
  54                 CPLD_WRITE(sys_reset, CPLD_SYSTEM_RESET);
  55                 break;
  56         default:
  57                 printf("CPLD Altbank Fail: Invalid value!\n");
  58                 return;
  59         }
  60 }
  61
  62 /**
  63  * Set the boot bank to the default bank
  64  */
  65 void cpld_set_defbank(void)
  66 {
  67         u8 val;
  68
  69         val = CPLD_DEFAULT_BANK;
  70
  71         CPLD_WRITE(global_reset, val);
  72 }
  73
  74 #ifdef DEBUG
  75 static void cpld_dump_regs(void)
  76 {
  77         printf("chip_id1        = 0x%02x\n", CPLD_READ(chip_id1));
  78         printf("chip_id2        = 0x%02x\n", CPLD_READ(chip_id2));
  79         printf("sw_maj_ver      = 0x%02x\n", CPLD_READ(sw_maj_ver));
  80         printf("sw_min_ver      = 0x%02x\n", CPLD_READ(sw_min_ver));
  81         printf("hw_ver          = 0x%02x\n", CPLD_READ(hw_ver));
  82         printf("software_on     = 0x%02x\n", CPLD_READ(software_on));
  83         printf("cfg_rcw_src     = 0x%02x\n", CPLD_READ(cfg_rcw_src));
  84         printf("res0            = 0x%02x\n", CPLD_READ(res0));
  85         printf("vbank           = 0x%02x\n", CPLD_READ(vbank));
  86         printf("sw1_sysclk      = 0x%02x\n", CPLD_READ(sw1_sysclk));
  87         printf("sw2_status      = 0x%02x\n", CPLD_READ(sw2_status));
  88         printf("sw3_status      = 0x%02x\n", CPLD_READ(sw3_status));
  89         printf("sw4_status      = 0x%02x\n", CPLD_READ(sw4_status));
  90         printf("sys_reset       = 0x%02x\n", CPLD_READ(sys_reset));
  91         printf("global_reset    = 0x%02x\n", CPLD_READ(global_reset));
  92         printf("res1            = 0x%02x\n", CPLD_READ(res1));
  93         putc('\n');
  94 }
  95 #endif
  96
  97 #ifndef CONFIG_SPL_BUILD
  98 int do_cpld(struct cmd_tbl *cmdtp, int flag, int argc, char *const argv[])
  99 {
 100         int rc = 0;
 101
 102         if (argc <= 1)
 103                 return cmd_usage(cmdtp);
 104
 105         if (strcmp(argv[1], "reset") == 0) {
 106                 if (strcmp(argv[2], "altbank") == 0)
 107                         cpld_set_altbank();
 108                 else
 109                         cpld_set_defbank();
 110 #ifdef DEBUG
 111         } else if (strcmp(argv[1], "dump") == 0) {
 112                 cpld_dump_regs();
 113 #endif
 114         } else
 115                 rc = cmd_usage(cmdtp);
 116
 117         return rc;
 118 }
 119
 120 U_BOOT_CMD(
 121         cpld, CONFIG_SYS_MAXARGS, 1, do_cpld,
 122         "Reset the board or alternate bank",
 123         "reset - reset to default bank\n"
 124         "cpld reset altbank - reset to alternate bank\n"
 125 #ifdef DEBUG
 126         "cpld dump - display the CPLD registers\n"
 127 #endif
 128         );
 129 #endif