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- // SPDX-License-Identifier: GPL-2.0+
- /*
- * Copyright (C) 2018 Synopsys, Inc. All rights reserved.
- */
- #include <common.h>
- #include <command.h>
- #include <cpu_func.h>
- #include <dwmmc.h>
- #include <init.h>
- #include <malloc.h>
- #include <linux/bitops.h>
- #include <asm/arcregs.h>
- DECLARE_GLOBAL_DATA_PTR;
- #define ARC_PERIPHERAL_BASE 0xF0000000
- #define CGU_ARC_FMEAS_ARC (void *)(ARC_PERIPHERAL_BASE + 0x84)
- #define CGU_ARC_FMEAS_ARC_START BIT(31)
- #define CGU_ARC_FMEAS_ARC_DONE BIT(30)
- #define CGU_ARC_FMEAS_ARC_CNT_MASK GENMASK(14, 0)
- #define CGU_ARC_FMEAS_ARC_RCNT_OFFSET 0
- #define CGU_ARC_FMEAS_ARC_FCNT_OFFSET 15
- #define SDIO_BASE (void *)(ARC_PERIPHERAL_BASE + 0x10000)
- int mach_cpu_init(void)
- {
- int rcnt, fcnt;
- u32 data;
- /* Start frequency measurement */
- writel(CGU_ARC_FMEAS_ARC_START, CGU_ARC_FMEAS_ARC);
- /* Poll DONE bit */
- do {
- data = readl(CGU_ARC_FMEAS_ARC);
- } while (!(data & CGU_ARC_FMEAS_ARC_DONE));
- /* Amount of reference 100 MHz clocks */
- rcnt = ((data >> CGU_ARC_FMEAS_ARC_RCNT_OFFSET) &
- CGU_ARC_FMEAS_ARC_CNT_MASK);
- /* Amount of CPU clocks */
- fcnt = ((data >> CGU_ARC_FMEAS_ARC_FCNT_OFFSET) &
- CGU_ARC_FMEAS_ARC_CNT_MASK);
- gd->cpu_clk = ((100 * fcnt) / rcnt) * 1000000;
- return 0;
- }
- int board_early_init_r(void)
- {
- #define EMSDP_PSRAM_BASE 0xf2001000
- #define PSRAM_FLASH_CONFIG_REG_0 (void *)(EMSDP_PSRAM_BASE + 0x10)
- #define PSRAM_FLASH_CONFIG_REG_1 (void *)(EMSDP_PSRAM_BASE + 0x14)
- #define CRE_ENABLE BIT(31)
- #define CRE_DRIVE_CMD BIT(6)
- #define PSRAM_RCR_DPD BIT(1)
- #define PSRAM_RCR_PAGE_MODE BIT(7)
- /*
- * PSRAM_FLASH_CONFIG_REG_x[30:15] to the address lines[16:1] of flash,
- * thus "<< 1".
- */
- #define PSRAM_RCR_SETUP ((PSRAM_RCR_DPD | PSRAM_RCR_PAGE_MODE) << 1)
- // Switch PSRAM controller to command mode
- writel(CRE_ENABLE | CRE_DRIVE_CMD, PSRAM_FLASH_CONFIG_REG_0);
- // Program Refresh Configuration Register (RCR) for BANK0
- writew(0, (void *)(0x10000000 + PSRAM_RCR_SETUP));
- // Switch PSRAM controller back to memory mode
- writel(0, PSRAM_FLASH_CONFIG_REG_0);
- // Switch PSRAM controller to command mode
- writel(CRE_ENABLE | CRE_DRIVE_CMD, PSRAM_FLASH_CONFIG_REG_1);
- // Program Refresh Configuration Register (RCR) for BANK1
- writew(0, (void *)(0x10800000 + PSRAM_RCR_SETUP));
- // Switch PSRAM controller back to memory mode
- writel(0, PSRAM_FLASH_CONFIG_REG_1);
- printf("PSRAM initialized.\n");
- return 0;
- }
- #define CREG_BASE 0xF0001000
- #define CREG_BOOT (void *)(CREG_BASE + 0x0FF0)
- #define CREG_IP_SW_RESET (void *)(CREG_BASE + 0x0FF0)
- #define CREG_IP_VERSION (void *)(CREG_BASE + 0x0FF8)
- /* Bits in CREG_BOOT register */
- #define CREG_BOOT_WP_BIT BIT(8)
- void reset_cpu(ulong addr)
- {
- writel(1, CREG_IP_SW_RESET);
- while (1)
- ; /* loop forever till reset */
- }
- static int do_emsdp_rom(struct cmd_tbl *cmdtp, int flag, int argc,
- char *const argv[])
- {
- u32 creg_boot = readl(CREG_BOOT);
- if (!strcmp(argv[1], "unlock"))
- creg_boot &= ~CREG_BOOT_WP_BIT;
- else if (!strcmp(argv[1], "lock"))
- creg_boot |= CREG_BOOT_WP_BIT;
- else
- return CMD_RET_USAGE;
- writel(creg_boot, CREG_BOOT);
- return CMD_RET_SUCCESS;
- }
- struct cmd_tbl cmd_emsdp[] = {
- U_BOOT_CMD_MKENT(rom, 2, 0, do_emsdp_rom, "", ""),
- };
- static int do_emsdp(struct cmd_tbl *cmdtp, int flag, int argc,
- char *const argv[])
- {
- struct cmd_tbl *c;
- c = find_cmd_tbl(argv[1], cmd_emsdp, ARRAY_SIZE(cmd_emsdp));
- /* Strip off leading 'emsdp' command */
- argc--;
- argv++;
- if (c == NULL || argc > c->maxargs)
- return CMD_RET_USAGE;
- return c->cmd(cmdtp, flag, argc, argv);
- }
- U_BOOT_CMD(
- emsdp, CONFIG_SYS_MAXARGS, 0, do_emsdp,
- "Synopsys EMSDP specific commands",
- "rom unlock - Unlock non-volatile memory for writing\n"
- "emsdp rom lock - Lock non-volatile memory to prevent writing\n"
- );
- int checkboard(void)
- {
- int version = readl(CREG_IP_VERSION);
- printf("Board: ARC EM Software Development Platform v%d.%d\n",
- (version >> 16) & 0xff, version & 0xff);
- return 0;
- };
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