path: root/arch/mips/cavium-octeon/setup.c

/*
 * This file is subject to the terms and conditions of the GNU General Public
 * License.  See the file "COPYING" in the main directory of this archive
 * for more details.
 *
 * Copyright (C) 2004-2007 Cavium Networks
 * Copyright (C) 2008, 2009 Wind River Systems
 *   written by Ralf Baechle <ralf@linux-mips.org>
 */
#include <linux/compiler.h>
#include <linux/vmalloc.h>
#include <linux/init.h>
#include <linux/kernel.h>
#include <linux/console.h>
#include <linux/delay.h>
#include <linux/export.h>
#include <linux/interrupt.h>
#include <linux/io.h>
#include <linux/serial.h>
#include <linux/smp.h>
#include <linux/types.h>
#include <linux/string.h>	/* for memset */
#include <linux/tty.h>
#include <linux/time.h>
#include <linux/platform_device.h>
#include <linux/serial_core.h>
#include <linux/serial_8250.h>
#include <linux/of_fdt.h>
#include <linux/libfdt.h>
#include <linux/kexec.h>

#include <asm/processor.h>
#include <asm/reboot.h>
#include <asm/smp-ops.h>
#include <asm/irq_cpu.h>
#include <asm/mipsregs.h>
#include <asm/bootinfo.h>
#include <asm/sections.h>
#include <asm/time.h>

#include <asm/octeon/octeon.h>
#include <asm/octeon/pci-octeon.h>
#include <asm/octeon/cvmx-mio-defs.h>

extern struct plat_smp_ops octeon_smp_ops;

#ifdef CONFIG_PCI
extern void pci_console_init(const char *arg);
#endif

static unsigned long long MAX_MEMORY = 512ull << 20;

struct octeon_boot_descriptor *octeon_boot_desc_ptr;

struct cvmx_bootinfo *octeon_bootinfo;
EXPORT_SYMBOL(octeon_bootinfo);

static unsigned long long RESERVE_LOW_MEM = 0ull;
#ifdef CONFIG_KEXEC
#ifdef CONFIG_SMP
/*
 * Wait for relocation code is prepared and send
 * secondary CPUs to spin until kernel is relocated.
 */
static void octeon_kexec_smp_down(void *ignored)
{
	int cpu = smp_processor_id();

	local_irq_disable();
	set_cpu_online(cpu, false);
	while (!atomic_read(&kexec_ready_to_reboot))
		cpu_relax();

	asm volatile (
	"	sync						\n"
	"	synci	($0)					\n");

	relocated_kexec_smp_wait(NULL);
}
#endif

#define OCTEON_DDR0_BASE    (0x0ULL)
#define OCTEON_DDR0_SIZE    (0x010000000ULL)
#define OCTEON_DDR1_BASE    (0x410000000ULL)
#define OCTEON_DDR1_SIZE    (0x010000000ULL)
#define OCTEON_DDR2_BASE    (0x020000000ULL)
#define OCTEON_DDR2_SIZE    (0x3e0000000ULL)
#define OCTEON_MAX_PHY_MEM_SIZE (16*1024*1024*1024ULL)

static struct kimage *kimage_ptr;

static void kexec_bootmem_init(uint64_t mem_size, uint32_t low_reserved_bytes)
{
	int64_t addr;
	struct cvmx_bootmem_desc *bootmem_desc;

	bootmem_desc = cvmx_bootmem_get_desc();

	if (mem_size > OCTEON_MAX_PHY_MEM_SIZE) {
		mem_size = OCTEON_MAX_PHY_MEM_SIZE;
		pr_err("Error: requested memory too large,"
		       "truncating to maximum size\n");
	}

	bootmem_desc->major_version = CVMX_BOOTMEM_DESC_MAJ_VER;
	bootmem_desc->minor_version = CVMX_BOOTMEM_DESC_MIN_VER;

	addr = (OCTEON_DDR0_BASE + RESERVE_LOW_MEM + low_reserved_bytes);
	bootmem_desc->head_addr = 0;

	if (mem_size <= OCTEON_DDR0_SIZE) {
		__cvmx_bootmem_phy_free(addr,
				mem_size - RESERVE_LOW_MEM -
				low_reserved_bytes, 0);
		return;
	}

	__cvmx_bootmem_phy_free(addr,
			OCTEON_DDR0_SIZE - RESERVE_LOW_MEM -
			low_reserved_bytes, 0);

	mem_size -= OCTEON_DDR0_SIZE;

	if (mem_size > OCTEON_DDR1_SIZE) {
		__cvmx_bootmem_phy_free(OCTEON_DDR1_BASE, OCTEON_DDR1_SIZE, 0);
		__cvmx_bootmem_phy_free(OCTEON_DDR2_BASE,
				mem_size - OCTEON_DDR1_SIZE, 0);
	} else
		__cvmx_bootmem_phy_free(OCTEON_DDR1_BASE, mem_size, 0);
}

static int octeon_kexec_prepare(struct kimage *image)
{
	int i;
	char *bootloader = "kexec";

	octeon_boot_desc_ptr->argc = 0;
	for (i = 0; i < image->nr_segments; i++) {
		if (!strncmp(bootloader, (char *)image->segment[i].buf,
				strlen(bootloader)))