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// SPDX-License-Identifier: GPL-2.0+
/*
* Copyright (C) 2018 Synopsys, Inc. All rights reserved.
*/
#include <command.h>
#include <cpu_func.h>
#include <dwmmc.h>
#include <init.h>
#include <malloc.h>
#include <asm/global_data.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(void)
{
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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