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 identify_rtl9302(void)
{
	switch (sw_r32(RTL93XX_MODEL_NAME_INFO) & 0xfffffff0) {
	case 0x93020810:
		soc_info.name = "RTL9302A 12x2.5G";
		break;
	case 0x93021010:
		soc_info.name = "RTL9302B 8x2.5G";
		break;
	case 0x93021810:
		soc_info.name = "RTL9302C 16x2.5G";
		break;
	case 0x93022010:
		soc_info.name = "RTL9302D 24x2.5G";
		break;
	case 0x93020800:
		soc_info.name = "RTL9302A";
		break;
	case 0x93021000:
		soc_info.name = "RTL9302B";
		break;
	case 0x93021800:
		soc_info.name = "RTL9302C";
		break;
	case 0x93022000:
		soc_info.name = "RTL9302D";
		break;
	case 0x93023001:
		soc_info.name = "RTL9302F";
		break;
	default:
		soc_info.name = "RTL9302";
	}
}

void __init prom_init(void)
{
	uint32_t model;

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

	model = sw_r32(RTL838X_MODEL_NAME_INFO);
	pr_info("RTL838X model is %x\n", model);
	model = model >> 16 & 0xFFFF;

	if ((model != 0x8328) && (model != 0x8330) && (model != 0x8332)
	    && (model != 0x8380) && (model != 0x8382)) {
		model = sw_r32(RTL839X_MODEL_NAME_INFO);
		pr_info("RTL839X model is %x\n", model);
		model = model >> 16 & 0xFFFF;
	}

	if ((model & 0x8390) != 0x8380 && (model & 0x8390) != 0x8390) {
		model = sw_r32(RTL93XX_MODEL_NAME_INFO);
		pr_info("RTL93XX model is %x\n", model);
		model = model >> 16 & 0xFFFF;
	}

	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;
	case 0x9301:
		soc_info.name = "RTL9301";
		soc_info.family = RTL9300_FAMILY_ID;
		break;
	case 0x9302:
		identify_rtl9302();
		soc_info.family = RTL9300_FAMILY_ID;
		break;
	case 0x9313:
		soc_info.name = "RTL9313";
		soc_info.family = RTL9310_FAMILY_ID;
		break;
	default:
		soc_info.name = "DEFAULT";
		soc_info.family = 0;
	}

	pr_info("SoC Type: %s\n", get_system_type());

	prom_init_cmdline();
}