arch/powerpc/boot/cuboot-52xx.c

Source file repositories/reference/linux-study-clean/arch/powerpc/boot/cuboot-52xx.c

File Facts

System
Linux kernel
Corpus path
arch/powerpc/boot/cuboot-52xx.c
Extension
.c
Size
1511 bytes
Lines
61
Domain
Architecture Layer
Bucket
arch/powerpc
Inferred role
Architecture Layer: implementation source
Status
source implementation candidate

Why This File Exists

CPU and platform-specific kernel glue: boot entry, traps, syscall entry, interrupts, page tables, context switch, and low-level barriers.

Dependency Surface

Detected Declarations

Annotated Snippet

// SPDX-License-Identifier: GPL-2.0-only
/*
 * Old U-boot compatibility for MPC5200
 *
 * Author: Grant Likely <grant.likely@secretlab.ca>
 *
 * Copyright (c) 2007 Secret Lab Technologies Ltd.
 * Copyright (c) 2007 Freescale Semiconductor, Inc.
 */

#include "ops.h"
#include "stdio.h"
#include "io.h"
#include "cuboot.h"

#define TARGET_PPC_MPC52xx
#include "ppcboot.h"

static bd_t bd;

static void platform_fixups(void)
{
	void *soc, *reg;
	int div;
	u32 sysfreq;


	dt_fixup_memory(bd.bi_memstart, bd.bi_memsize);
	dt_fixup_mac_addresses(bd.bi_enetaddr);
	dt_fixup_cpu_clocks(bd.bi_intfreq, bd.bi_busfreq / 4, bd.bi_busfreq);

	/* Unfortunately, the specific model number is encoded in the
	 * soc node name in existing dts files -- once that is fixed,
	 * this can do a simple path lookup.
	 */
	soc = find_node_by_devtype(NULL, "soc");
	if (!soc)
		soc = find_node_by_compatible(NULL, "fsl,mpc5200-immr");
	if (!soc)
		soc = find_node_by_compatible(NULL, "fsl,mpc5200b-immr");
	if (soc) {
		setprop(soc, "bus-frequency", &bd.bi_ipbfreq,
			sizeof(bd.bi_ipbfreq));

		if (!dt_xlate_reg(soc, 0, (void*)&reg, NULL))
			return;
		div = in_8(reg + 0x204) & 0x0020 ? 8 : 4;
		sysfreq = bd.bi_busfreq * div;
		setprop(soc, "system-frequency", &sysfreq, sizeof(sysfreq));
	}
}

void platform_init(unsigned long r3, unsigned long r4, unsigned long r5,
                   unsigned long r6, unsigned long r7)
{
	CUBOOT_INIT();
	fdt_init(_dtb_start);
	serial_console_init();
	platform_ops.fixups = platform_fixups;
}

Annotation

Implementation Notes