xiaomi-ax3600/target/linux/realtek/files-6.12/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 <asm/fw/fw.h>
#include <asm/mips-cps.h>
#include <asm/prom.h>
#include <asm/smp-ops.h>
#include <linux/smp.h>

#include <mach-rtl83xx.h>

struct rtl83xx_soc_info soc_info;
const void *fdt;

#ifdef CONFIG_MIPS_MT_SMP

extern const struct plat_smp_ops vsmp_smp_ops;
static struct plat_smp_ops rtlops;

static void rtlsmp_init_secondary(void)
{
	/*
	 * Enable all CPU interrupts, as everything is managed by the external controller.
	 * TODO: Standard vsmp_init_secondary() has special treatment for Malta if external
	 * GIC is available. Maybe we need this too.
	 */
	if (mips_gic_present())
		pr_warn("%s: GIC present. Maybe interrupt enabling required.\n", __func__);
	else
		set_c0_status(ST0_IM);
}

static void rtlsmp_finish(void)
{
	/* These devices are low on resources. There might be the chance that CEVT_R4K is
	 * not enabled in kernel build. Nevertheless the timer and interrupt 7 might be
	 * active by default after startup of secondary VPEs. With no registered handler
	 * that leads to continuous unhandeled interrupts. Disable it but keep the counter
	 * running so it can still be used as an entropy source.
	 */
	if (!IS_ENABLED(CONFIG_CEVT_R4K)) {
		write_c0_status(read_c0_status() & ~CAUSEF_IP7);
		write_c0_compare(read_c0_count() - 1);
	}

	local_irq_enable();
}

static int rtlsmp_register(void)
{
	if (!cpu_has_mipsmt)
		return 1;

	rtlops = vsmp_smp_ops;
	rtlops.init_secondary = rtlsmp_init_secondary;
	rtlops.smp_finish = rtlsmp_finish;
	register_smp_ops(&rtlops);

	return 0;
}

#else /* !CONFIG_MIPS_MT_SMP */

#define rtlsmp_register() (1)

#endif

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();

	/* delay cpc & smp probing to allow devicetree access */
	mips_cpc_probe();

	if (!register_cps_smp_ops())
		return;

	if (!rtlsmp_register())
		return;

	register_up_smp_ops();
}

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

static 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;

	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 0x9303:
		soc_info.name = "RTL9303";
		soc_info.family = RTL9300_FAMILY_ID;
		break;
	case 0x9311:
		soc_info.name = "RTL9311";
		soc_info.family = RTL9310_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());

	/*
	 * fw_arg2 is be the pointer to the environment. Some devices (e.g. HP JG924A) hand
	 * over other than expected kernel boot arguments. Something like 0xfffdffff looks
	 * suspicous. Do extra cleanup for fw_init_cmdline() to avoid a hang during boot.
	 */
	if (fw_arg2 >= CKSEG2)
		fw_arg2 = 0;

	fw_init_cmdline();
}