1 // SPDX-License-Identifier: GPL-2.0+
3 * Copyright (C) 2018 Synopsys, Inc. All rights reserved.
13 #include <asm/arcregs.h>
15 DECLARE_GLOBAL_DATA_PTR;
17 #define ARC_PERIPHERAL_BASE 0xF0000000
19 #define CGU_ARC_FMEAS_ARC (void *)(ARC_PERIPHERAL_BASE + 0x84)
20 #define CGU_ARC_FMEAS_ARC_START BIT(31)
21 #define CGU_ARC_FMEAS_ARC_DONE BIT(30)
22 #define CGU_ARC_FMEAS_ARC_CNT_MASK GENMASK(14, 0)
23 #define CGU_ARC_FMEAS_ARC_RCNT_OFFSET 0
24 #define CGU_ARC_FMEAS_ARC_FCNT_OFFSET 15
26 #define SDIO_BASE (void *)(ARC_PERIPHERAL_BASE + 0x10000)
28 int mach_cpu_init(void)
33 /* Start frequency measurement */
34 writel(CGU_ARC_FMEAS_ARC_START, CGU_ARC_FMEAS_ARC);
38 data = readl(CGU_ARC_FMEAS_ARC);
39 } while (!(data & CGU_ARC_FMEAS_ARC_DONE));
41 /* Amount of reference 100 MHz clocks */
42 rcnt = ((data >> CGU_ARC_FMEAS_ARC_RCNT_OFFSET) &
43 CGU_ARC_FMEAS_ARC_CNT_MASK);
45 /* Amount of CPU clocks */
46 fcnt = ((data >> CGU_ARC_FMEAS_ARC_FCNT_OFFSET) &
47 CGU_ARC_FMEAS_ARC_CNT_MASK);
49 gd->cpu_clk = ((100 * fcnt) / rcnt) * 1000000;
54 int board_early_init_r(void)
56 #define EMSDP_PSRAM_BASE 0xf2001000
57 #define PSRAM_FLASH_CONFIG_REG_0 (void *)(EMSDP_PSRAM_BASE + 0x10)
58 #define PSRAM_FLASH_CONFIG_REG_1 (void *)(EMSDP_PSRAM_BASE + 0x14)
59 #define CRE_ENABLE BIT(31)
60 #define CRE_DRIVE_CMD BIT(6)
62 #define PSRAM_RCR_DPD BIT(1)
63 #define PSRAM_RCR_PAGE_MODE BIT(7)
66 * PSRAM_FLASH_CONFIG_REG_x[30:15] to the address lines[16:1] of flash,
69 #define PSRAM_RCR_SETUP ((PSRAM_RCR_DPD | PSRAM_RCR_PAGE_MODE) << 1)
71 // Switch PSRAM controller to command mode
72 writel(CRE_ENABLE | CRE_DRIVE_CMD, PSRAM_FLASH_CONFIG_REG_0);
73 // Program Refresh Configuration Register (RCR) for BANK0
74 writew(0, (void *)(0x10000000 + PSRAM_RCR_SETUP));
75 // Switch PSRAM controller back to memory mode
76 writel(0, PSRAM_FLASH_CONFIG_REG_0);
79 // Switch PSRAM controller to command mode
80 writel(CRE_ENABLE | CRE_DRIVE_CMD, PSRAM_FLASH_CONFIG_REG_1);
81 // Program Refresh Configuration Register (RCR) for BANK1
82 writew(0, (void *)(0x10800000 + PSRAM_RCR_SETUP));
83 // Switch PSRAM controller back to memory mode
84 writel(0, PSRAM_FLASH_CONFIG_REG_1);
86 printf("PSRAM initialized.\n");
91 #define CREG_BASE 0xF0001000
92 #define CREG_BOOT (void *)(CREG_BASE + 0x0FF0)
93 #define CREG_IP_SW_RESET (void *)(CREG_BASE + 0x0FF0)
94 #define CREG_IP_VERSION (void *)(CREG_BASE + 0x0FF8)
96 /* Bits in CREG_BOOT register */
97 #define CREG_BOOT_WP_BIT BIT(8)
99 void reset_cpu(ulong addr)
101 writel(1, CREG_IP_SW_RESET);
103 ; /* loop forever till reset */
106 static int do_emsdp_rom(struct cmd_tbl *cmdtp, int flag, int argc,
109 u32 creg_boot = readl(CREG_BOOT);
111 if (!strcmp(argv[1], "unlock"))
112 creg_boot &= ~CREG_BOOT_WP_BIT;
113 else if (!strcmp(argv[1], "lock"))
114 creg_boot |= CREG_BOOT_WP_BIT;
116 return CMD_RET_USAGE;
118 writel(creg_boot, CREG_BOOT);
120 return CMD_RET_SUCCESS;
123 struct cmd_tbl cmd_emsdp[] = {
124 U_BOOT_CMD_MKENT(rom, 2, 0, do_emsdp_rom, "", ""),
127 static int do_emsdp(struct cmd_tbl *cmdtp, int flag, int argc,
132 c = find_cmd_tbl(argv[1], cmd_emsdp, ARRAY_SIZE(cmd_emsdp));
134 /* Strip off leading 'emsdp' command */
138 if (c == NULL || argc > c->maxargs)
139 return CMD_RET_USAGE;
141 return c->cmd(cmdtp, flag, argc, argv);
145 emsdp, CONFIG_SYS_MAXARGS, 0, do_emsdp,
146 "Synopsys EMSDP specific commands",
147 "rom unlock - Unlock non-volatile memory for writing\n"
148 "emsdp rom lock - Lock non-volatile memory to prevent writing\n"
153 int version = readl(CREG_IP_VERSION);
155 printf("Board: ARC EM Software Development Platform v%d.%d\n",
156 (version >> 16) & 0xff, version & 0xff);