openwrt/target/linux/realtek/files-5.4/arch/mips/rtl838x/prom.c

// SPDX-License-Identifier: GPL-2.0-only
/*
 * prom.c
 * Early intialization code for the Realtek RTL838X SoC
 *
 * based on the original BSP by
 * Copyright (C) 2006-2012 Tony Wu (tonywu@realtek.com)
 * Copyright (C) 2020 B. Koblitz
 *
 */

#include <linux/init.h>
#include <linux/kernel.h>
#include <linux/string.h>
#include <linux/of_fdt.h>
#include <linux/libfdt.h>
#include <asm/bootinfo.h>
#include <asm/addrspace.h>
#include <asm/page.h>
#include <asm/cpu.h>

#include <mach-rtl83xx.h>

extern char arcs_cmdline[];
extern const char __appended_dtb;

struct rtl83xx_soc_info soc_info;
const void *fdt;

const char *get_system_type(void)
{
	return soc_info.name;
}

void __init prom_free_prom_memory(void)
{

}

void __init device_tree_init(void)
{
	if (!fdt_check_header(&__appended_dtb)) {
		fdt = &__appended_dtb;
		pr_info("Using appended Device Tree.\n");
	}
	initial_boot_params = (void *)fdt;
	unflatten_and_copy_device_tree();
}

static void __init prom_init_cmdline(void)
{
	int argc = fw_arg0;
	char **argv = (char **) KSEG1ADDR(fw_arg1);
	int i;

	arcs_cmdline[0] = '\0';

	for (i = 0; i < argc; i++) {
		char *p = (char *) KSEG1ADDR(argv[i]);

		if (CPHYSADDR(p) && *p) {
			strlcat(arcs_cmdline, p, sizeof(arcs_cmdline));
			strlcat(arcs_cmdline, " ", sizeof(arcs_cmdline));
		}
	}
	pr_info("Kernel command line: %s\n", arcs_cmdline);
}

void __init prom_init(void)
{
	uint32_t model;

	/* uart0 */
        setup_8250_early_printk_port(0xb8002000, 2, 0);

	soc_info.sw_base = RTL838X_SW_BASE;

	model = sw_r32(RTL838X_MODEL_NAME_INFO) >> 16;
	if (model != 0x8328 && model != 0x8330 && model != 0x8332 &&
	    model != 0x8380 && model != 0x8382)
		model = sw_r32(RTL839X_MODEL_NAME_INFO) >> 16;

	soc_info.id = model;

	switch (model) {
	case 0x8328:
		soc_info.name = "RTL8328";
		soc_info.family = RTL8328_FAMILY_ID;
		break;
	case 0x8332:
		soc_info.name = "RTL8332";
		soc_info.family = RTL8380_FAMILY_ID;
		break;
	case 0x8380:
		soc_info.name = "RTL8380";
		soc_info.family = RTL8380_FAMILY_ID;
		break;
	case 0x8382:
		soc_info.name = "RTL8382";
		soc_info.family = RTL8380_FAMILY_ID;
		break;
	case 0x8390:
		soc_info.name = "RTL8390";
		soc_info.family = RTL8390_FAMILY_ID;
		break;
	case 0x8391:
		soc_info.name = "RTL8391";
		soc_info.family = RTL8390_FAMILY_ID;
		break;
	case 0x8392:
		soc_info.name = "RTL8392";
		soc_info.family = RTL8390_FAMILY_ID;
		break;
	case 0x8393:
		soc_info.name = "RTL8393";
		soc_info.family = RTL8390_FAMILY_ID;
		break;
	default:
		soc_info.name = "DEFAULT";
		soc_info.family = 0;
	}
	pr_info("SoC Type: %s\n", get_system_type());
	prom_init_cmdline();
}