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-rw-r--r--board/freescale/ls1043ardb/cpld.c152
1 files changed, 152 insertions, 0 deletions
diff --git a/board/freescale/ls1043ardb/cpld.c b/board/freescale/ls1043ardb/cpld.c
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+++ b/board/freescale/ls1043ardb/cpld.c
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+/*
+ * Copyright 2015 Freescale Semiconductor
+ *
+ * SPDX-License-Identifier: GPL-2.0+
+ *
+ * Freescale LS1043ARDB board-specific CPLD controlling supports.
+ */
+
+#include <common.h>
+#include <command.h>
+#include <asm/io.h>
+#include "cpld.h"
+
+u8 cpld_read(unsigned int reg)
+{
+ void *p = (void *)CONFIG_SYS_CPLD_BASE;
+
+ return in_8(p + reg);
+}
+
+void cpld_write(unsigned int reg, u8 value)
+{
+ void *p = (void *)CONFIG_SYS_CPLD_BASE;
+
+ out_8(p + reg, value);
+}
+
+/* Set the boot bank to the alternate bank */
+void cpld_set_altbank(void)
+{
+ u8 reg4 = CPLD_READ(soft_mux_on);
+ u8 reg7 = CPLD_READ(vbank);
+
+ CPLD_WRITE(soft_mux_on, reg4 | CPLD_SW_MUX_BANK_SEL);
+
+ reg7 = (reg7 & ~CPLD_BANK_SEL_MASK) | CPLD_BANK_SEL_ALTBANK;
+ CPLD_WRITE(vbank, reg7);
+
+ CPLD_WRITE(system_rst, 1);
+}
+
+/* Set the boot bank to the default bank */
+void cpld_set_defbank(void)
+{
+ CPLD_WRITE(global_rst, 1);
+}
+
+void cpld_set_nand(void)
+{
+ u16 reg = CPLD_CFG_RCW_SRC_NAND;
+ u8 reg5 = (u8)(reg >> 1);
+ u8 reg6 = (u8)(reg & 1);
+
+ cpld_rev_bit(&reg5);
+
+ CPLD_WRITE(soft_mux_on, 1);
+
+ CPLD_WRITE(cfg_rcw_src1, reg5);
+ CPLD_WRITE(cfg_rcw_src2, reg6);
+
+ CPLD_WRITE(system_rst, 1);
+}
+
+void cpld_set_sd(void)
+{
+ u16 reg = CPLD_CFG_RCW_SRC_SD;
+ u8 reg5 = (u8)(reg >> 1);
+ u8 reg6 = (u8)(reg & 1);
+
+ cpld_rev_bit(&reg5);
+
+ CPLD_WRITE(soft_mux_on, 1);
+
+ CPLD_WRITE(cfg_rcw_src1, reg5);
+ CPLD_WRITE(cfg_rcw_src2, reg6);
+
+ CPLD_WRITE(system_rst, 1);
+}
+#ifdef DEBUG
+static void cpld_dump_regs(void)
+{
+ printf("cpld_ver = %x\n", CPLD_READ(cpld_ver));
+ printf("cpld_ver_sub = %x\n", CPLD_READ(cpld_ver_sub));
+ printf("pcba_ver = %x\n", CPLD_READ(pcba_ver));
+ printf("soft_mux_on = %x\n", CPLD_READ(soft_mux_on));
+ printf("cfg_rcw_src1 = %x\n", CPLD_READ(cfg_rcw_src1));
+ printf("cfg_rcw_src2 = %x\n", CPLD_READ(cfg_rcw_src2));
+ printf("vbank = %x\n", CPLD_READ(vbank));
+ printf("sysclk_sel = %x\n", CPLD_READ(sysclk_sel));
+ printf("uart_sel = %x\n", CPLD_READ(uart_sel));
+ printf("sd1refclk_sel = %x\n", CPLD_READ(sd1refclk_sel));
+ printf("tdmclk_mux_sel = %x\n", CPLD_READ(tdmclk_mux_sel));
+ printf("sdhc_spics_sel = %x\n", CPLD_READ(sdhc_spics_sel));
+ printf("status_led = %x\n", CPLD_READ(status_led));
+ putc('\n');
+}
+#endif
+
+void cpld_rev_bit(unsigned char *value)
+{
+ u8 rev_val, val;
+ int i;
+
+ val = *value;
+ rev_val = val & 1;
+ for (i = 1; i <= 7; i++) {
+ val >>= 1;
+ rev_val <<= 1;
+ rev_val |= val & 1;
+ }
+
+ *value = rev_val;
+}
+
+int do_cpld(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
+{
+ int rc = 0;
+
+ if (argc <= 1)
+ return cmd_usage(cmdtp);
+
+ if (strcmp(argv[1], "reset") == 0) {
+ if (strcmp(argv[2], "altbank") == 0)
+ cpld_set_altbank();
+ else if (strcmp(argv[2], "nand") == 0)
+ cpld_set_nand();
+ else if (strcmp(argv[2], "sd") == 0)
+ cpld_set_sd();
+ else
+ cpld_set_defbank();
+#ifdef DEBUG
+ } else if (strcmp(argv[1], "dump") == 0) {
+ cpld_dump_regs();
+#endif
+ } else {
+ rc = cmd_usage(cmdtp);
+ }
+
+ return rc;
+}
+
+U_BOOT_CMD(
+ cpld, CONFIG_SYS_MAXARGS, 1, do_cpld,
+ "Reset the board or alternate bank",
+ "reset: reset to default bank\n"
+ "cpld reset altbank: reset to alternate bank\n"
+ "cpld reset nand: reset to boot from NAND flash\n"
+ "cpld reset sd: reset to boot from SD card\n"
+#ifdef DEBUG
+ "cpld dump - display the CPLD registers\n"
+#endif
+);