diff options
Diffstat (limited to 'board/freescale/ls1043ardb/cpld.c')
| -rw-r--r-- | board/freescale/ls1043ardb/cpld.c | 152 |
1 files changed, 152 insertions, 0 deletions
diff --git a/board/freescale/ls1043ardb/cpld.c b/board/freescale/ls1043ardb/cpld.c new file mode 100644 index 0000000..78c2824 --- /dev/null +++ b/board/freescale/ls1043ardb/cpld.c @@ -0,0 +1,152 @@ +/* + * 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(®5); + + 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(®5); + + 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 +); |