arch/c6x/kernel/setup.c - arm/linux-arm-legacy - Git at Google

 /*
  *  Port on Texas Instruments TMS320C6x architecture
  *
  *  Copyright (C) 2004, 2006, 2009, 2010, 2011 Texas Instruments Incorporated
  *  Author: Aurelien Jacquiot (aurelien.jacquiot@jaluna.com)
  *
  *  This program is free software; you can redistribute it and/or modify
  *  it under the terms of the GNU General Public License version 2 as
  *  published by the Free Software Foundation.
  */
 #include <linux/dma-mapping.h>
 #include <linux/memblock.h>
 #include <linux/seq_file.h>
 #include <linux/bootmem.h>
 #include <linux/clkdev.h>
 #include <linux/initrd.h>
 #include <linux/kernel.h>
 #include <linux/module.h>
 #include <linux/of_fdt.h>
 #include <linux/string.h>
 #include <linux/errno.h>
 #include <linux/cache.h>
 #include <linux/delay.h>
 #include <linux/sched.h>
 #include <linux/clk.h>
 #include <linux/cpu.h>
 #include <linux/fs.h>
 #include <linux/of.h>


 #include <asm/sections.h>
 #include <asm/div64.h>
 #include <asm/setup.h>
 #include <asm/dscr.h>
 #include <asm/clock.h>
 #include <asm/soc.h>
 #include <asm/special_insns.h>

 static const char *c6x_soc_name;

 int c6x_num_cores;
 EXPORT_SYMBOL_GPL(c6x_num_cores);

 unsigned int c6x_silicon_rev;
 EXPORT_SYMBOL_GPL(c6x_silicon_rev);

 /*
  * Device status register. This holds information
  * about device configuration needed by some drivers.
  */
 unsigned int c6x_devstat;
 EXPORT_SYMBOL_GPL(c6x_devstat);

 /*
  * Some SoCs have fuse registers holding a unique MAC
  * address. This is parsed out of the device tree with
  * the resulting MAC being held here.
  */
 unsigned char c6x_fuse_mac[6];

 unsigned long memory_start;
 unsigned long memory_end;

 unsigned long ram_start;
 unsigned long ram_end;

 /* Uncached memory for DMA consistent use (memdma=) */
 static unsigned long dma_start __initdata;
 static unsigned long dma_size __initdata;

 struct cpuinfo_c6x {
 	const char *cpu_name;
 	const char *cpu_voltage;
 	const char *mmu;
 	const char *fpu;
 	char *cpu_rev;
 	unsigned int core_id;
 	char __cpu_rev[5];
 };

 static DEFINE_PER_CPU(struct cpuinfo_c6x, cpu_data);

 unsigned int ticks_per_ns_scaled;
 EXPORT_SYMBOL(ticks_per_ns_scaled);

 unsigned int c6x_core_freq;

 static void __init get_cpuinfo(void)
 {
 	unsigned cpu_id, rev_id, csr;
 	struct clk *coreclk = clk_get_sys(NULL, "core");
 	unsigned long core_khz;
 	u64 tmp;
 	struct cpuinfo_c6x *p;
 	struct device_node *node, *np;

 	p = &per_cpu(cpu_data, smp_processor_id());

 	if (!IS_ERR(coreclk))
 		c6x_core_freq = clk_get_rate(coreclk);
 	else {
 		printk(KERN_WARNING
 		       "Cannot find core clock frequency. Using 700MHz\n");
 		c6x_core_freq = 700000000;
 	}

 	core_khz = c6x_core_freq / 1000;

 	tmp = (uint64_t)core_khz << C6X_NDELAY_SCALE;
 	do_div(tmp, 1000000);
 	ticks_per_ns_scaled = tmp;

 	csr = get_creg(CSR);
 	cpu_id = csr >> 24;
 	rev_id = (csr >> 16) & 0xff;

 	p->mmu = "none";
 	p->fpu = "none";
 	p->cpu_voltage = "unknown";

 	switch (cpu_id) {
 	case 0:
 		p->cpu_name = "C67x";
 		p->fpu = "yes";
 		break;
 	case 2:
 		p->cpu_name = "C62x";
 		break;
 	case 8:
 		p->cpu_name = "C64x";
 		break;
 	case 12:
 		p->cpu_name = "C64x";
 		break;
 	case 16:
 		p->cpu_name = "C64x+";
 		p->cpu_voltage = "1.2";
 		break;
 	case 21:
 		p->cpu_name = "C66X";
 		p->cpu_voltage = "1.2";
 		break;
 	default:
 		p->cpu_name = "unknown";
 		break;
 	}

 	if (cpu_id < 16) {
 		switch (rev_id) {
 		case 0x1:
 			if (cpu_id > 8) {
 				p->cpu_rev = "DM640/DM641/DM642/DM643";
 				p->cpu_voltage = "1.2 - 1.4";
 			} else {
 				p->cpu_rev = "C6201";
 				p->cpu_voltage = "2.5";
 			}
 			break;
 		case 0x2:
 			p->cpu_rev = "C6201B/C6202/C6211";
 			p->cpu_voltage = "1.8";
 			break;
 		case 0x3:
 			p->cpu_rev = "C6202B/C6203/C6204/C6205";
 			p->cpu_voltage = "1.5";
 			break;
 		case 0x201:
 			p->cpu_rev = "C6701 revision 0 (early CPU)";
 			p->cpu_voltage = "1.8";
 			break;
 		case 0x202:
 			p->cpu_rev = "C6701/C6711/C6712";
 			p->cpu_voltage = "1.8";
 			break;
 		case 0x801:
 			p->cpu_rev = "C64x";
 			p->cpu_voltage = "1.5";
 			break;
 		default:
 			p->cpu_rev = "unknown";
 		}
 	} else {
 		p->cpu_rev = p->__cpu_rev;
 		snprintf(p->__cpu_rev, sizeof(p->__cpu_rev), "0x%x", cpu_id);
 	}

 	p->core_id = get_coreid();

 	node = of_find_node_by_name(NULL, "cpus");
 	if (node) {
 		for_each_child_of_node(node, np)
 			if (!strcmp("cpu", np->name))
 				++c6x_num_cores;
 		of_node_put(node);
 	}

 	node = of_find_node_by_name(NULL, "soc");
 	if (node) {
 		if (of_property_read_string(node, "model", &c6x_soc_name))
 			c6x_soc_name = "unknown";
 		of_node_put(node);
 	} else
 		c6x_soc_name = "unknown";

 	printk(KERN_INFO "CPU%d: %s rev %s, %s volts, %uMHz\n",
 	       p->core_id, p->cpu_name, p->cpu_rev,
 	       p->cpu_voltage, c6x_core_freq / 1000000);
 }

 /*
  * Early parsing of the command line
  */
 static u32 mem_size __initdata;

 /* "mem=" parsing. */
 static int __init early_mem(char *p)
 {
 	if (!p)
 		return -EINVAL;

 	mem_size = memparse(p, &p);
 	/* don't remove all of memory when handling "mem={invalid}" */
 	if (mem_size == 0)
 		return -EINVAL;

 	return 0;
 }
 early_param("mem", early_mem);

 /* "memdma=<size>[@<address>]" parsing. */
 static int __init early_memdma(char *p)
 {
 	if (!p)
 		return -EINVAL;

 	dma_size = memparse(p, &p);
 	if (*p == '@')
 		dma_start = memparse(p, &p);

 	return 0;
 }
 early_param("memdma", early_memdma);

 int __init c6x_add_memory(phys_addr_t start, unsigned long size)
 {
 	static int ram_found __initdata;

 	/* We only handle one bank (the one with PAGE_OFFSET) for now */
 	if (ram_found)
 		return -EINVAL;

 	if (start > PAGE_OFFSET || PAGE_OFFSET >= (start + size))
 		return 0;

 	ram_start = start;
 	ram_end = start + size;

 	ram_found = 1;
 	return 0;
 }

 /*
  * Do early machine setup and device tree parsing. This is called very
  * early on the boot process.
  */
 notrace void __init machine_init(unsigned long dt_ptr)
 {
 	struct boot_param_header *dtb = __va(dt_ptr);
 	struct boot_param_header *fdt = (struct boot_param_header *)_fdt_start;

 	/* interrupts must be masked */
 	set_creg(IER, 2);

 	/*
 	 * Set the Interrupt Service Table (IST) to the beginning of the
 	 * vector table.
 	 */
 	set_ist(_vectors_start);

 	lockdep_init();

 	/*
 	 * dtb is passed in from bootloader.
 	 * fdt is linked in blob.
 	 */
 	if (dtb && dtb != fdt)
 		fdt = dtb;

 	/* Do some early initialization based on the flat device tree */
 	early_init_dt_scan(fdt);

 	parse_early_param();
 }

 void __init setup_arch(char **cmdline_p)
 {
 	int bootmap_size;
 	struct memblock_region *reg;

 	printk(KERN_INFO "Initializing kernel\n");

 	/* Initialize command line */
 	*cmdline_p = boot_command_line;

 	memory_end = ram_end;
 	memory_end &= ~(PAGE_SIZE - 1);

 	if (mem_size && (PAGE_OFFSET + PAGE_ALIGN(mem_size)) < memory_end)
 		memory_end = PAGE_OFFSET + PAGE_ALIGN(mem_size);

 	/* add block that this kernel can use */
 	memblock_add(PAGE_OFFSET, memory_end - PAGE_OFFSET);

 	/* reserve kernel text/data/bss */
 	memblock_reserve(PAGE_OFFSET,
 			 PAGE_ALIGN((unsigned long)&_end - PAGE_OFFSET));

 	if (dma_size) {
 		/* align to cacheability granularity */
 		dma_size = CACHE_REGION_END(dma_size);

 		if (!dma_start)
 			dma_start = memory_end - dma_size;

 		/* align to cacheability granularity */
 		dma_start = CACHE_REGION_START(dma_start);

 		/* reserve DMA memory taken from kernel memory */
 		if (memblock_is_region_memory(dma_start, dma_size))
 			memblock_reserve(dma_start, dma_size);
 	}

 	memory_start = PAGE_ALIGN((unsigned int) &_end);

 	printk(KERN_INFO "Memory Start=%08lx, Memory End=%08lx\n",
 	       memory_start, memory_end);

 #ifdef CONFIG_BLK_DEV_INITRD
 	/*
 	 * Reserve initrd memory if in kernel memory.
 	 */
 	if (initrd_start < initrd_end)
 		if (memblock_is_region_memory(initrd_start,
 					      initrd_end - initrd_start))
 			memblock_reserve(initrd_start,
 					 initrd_end - initrd_start);
 #endif

 	init_mm.start_code = (unsigned long) &_stext;
 	init_mm.end_code   = (unsigned long) &_etext;
 	init_mm.end_data   = memory_start;
 	init_mm.brk        = memory_start;

 	/*
 	 * Give all the memory to the bootmap allocator,  tell it to put the
 	 * boot mem_map at the start of memory
 	 */
 	bootmap_size = init_bootmem_node(NODE_DATA(0),
 					 memory_start >> PAGE_SHIFT,
 					 PAGE_OFFSET >> PAGE_SHIFT,
 					 memory_end >> PAGE_SHIFT);
 	memblock_reserve(memory_start, bootmap_size);

 	unflatten_device_tree();

 	c6x_cache_init();

 	/* Set the whole external memory as non-cacheable */
 	disable_caching(ram_start, ram_end - 1);

 	/* Set caching of external RAM used by Linux */
 	for_each_memblock(memory, reg)
 		enable_caching(CACHE_REGION_START(reg->base),
 			       CACHE_REGION_START(reg->base + reg->size - 1));

 #ifdef CONFIG_BLK_DEV_INITRD
 	/*
 	 * Enable caching for initrd which falls outside kernel memory.
 	 */
 	if (initrd_start < initrd_end) {
 		if (!memblock_is_region_memory(initrd_start,
 					       initrd_end - initrd_start))
 			enable_caching(CACHE_REGION_START(initrd_start),
 				       CACHE_REGION_START(initrd_end - 1));
 	}
 #endif

 	/*
 	 * Disable caching for dma coherent memory taken from kernel memory.
 	 */
 	if (dma_size && memblock_is_region_memory(dma_start, dma_size))
 		disable_caching(dma_start,
 				CACHE_REGION_START(dma_start + dma_size - 1));

 	/* Initialize the coherent memory allocator */
 	coherent_mem_init(dma_start, dma_size);

 	/*
 	 * Free all memory as a starting point.
 	 */
 	free_bootmem(PAGE_OFFSET, memory_end - PAGE_OFFSET);

 	/*
 	 * Then reserve memory which is already being used.
 	 */
 	for_each_memblock(reserved, reg) {
 		pr_debug("reserved - 0x%08x-0x%08x\n",
 			 (u32) reg->base, (u32) reg->size);
 		reserve_bootmem(reg->base, reg->size, BOOTMEM_DEFAULT);
 	}

 	max_low_pfn = PFN_DOWN(memory_end);
 	min_low_pfn = PFN_UP(memory_start);
 	max_mapnr = max_low_pfn - min_low_pfn;

 	/* Get kmalloc into gear */
 	paging_init();

 	/*
 	 * Probe for Device State Configuration Registers.
 	 * We have to do this early in case timer needs to be enabled
 	 * through DSCR.
 	 */
 	dscr_probe();

 	/* We do this early for timer and core clock frequency */
 	c64x_setup_clocks();

 	/* Get CPU info */
 	get_cpuinfo();

 #if defined(CONFIG_VT) && defined(CONFIG_DUMMY_CONSOLE)
 	conswitchp = &dummy_con;
 #endif
 }

 #define cpu_to_ptr(n) ((void *)((long)(n)+1))
 #define ptr_to_cpu(p) ((long)(p) - 1)

 static int show_cpuinfo(struct seq_file *m, void *v)
 {
 	int n = ptr_to_cpu(v);
 	struct cpuinfo_c6x *p = &per_cpu(cpu_data, n);

 	if (n == 0) {
 		seq_printf(m,
 			   "soc\t\t: %s\n"
 			   "soc revision\t: 0x%x\n"
 			   "soc cores\t: %d\n",
 			   c6x_soc_name, c6x_silicon_rev, c6x_num_cores);
 	}

 	seq_printf(m,
 		   "\n"
 		   "processor\t: %d\n"
 		   "cpu\t\t: %s\n"
 		   "core revision\t: %s\n"
 		   "core voltage\t: %s\n"
 		   "core id\t\t: %d\n"
 		   "mmu\t\t: %s\n"
 		   "fpu\t\t: %s\n"
 		   "cpu MHz\t\t: %u\n"
 		   "bogomips\t: %lu.%02lu\n\n",
 		   n,
 		   p->cpu_name, p->cpu_rev, p->cpu_voltage,
 		   p->core_id, p->mmu, p->fpu,
 		   (c6x_core_freq + 500000) / 1000000,
 		   (loops_per_jiffy/(500000/HZ)),
 		   (loops_per_jiffy/(5000/HZ))%100);

 	return 0;
 }

 static void *c_start(struct seq_file *m, loff_t *pos)
 {
 	return *pos < nr_cpu_ids ? cpu_to_ptr(*pos) : NULL;
 }
 static void *c_next(struct seq_file *m, void *v, loff_t *pos)
 {
 	++*pos;
 	return NULL;
 }
 static void c_stop(struct seq_file *m, void *v)
 {
 }

 const struct seq_operations cpuinfo_op = {
 	c_start,
 	c_stop,
 	c_next,
 	show_cpuinfo
 };

 static struct cpu cpu_devices[NR_CPUS];

 static int __init topology_init(void)
 {
 	int i;

 	for_each_present_cpu(i)
 		register_cpu(&cpu_devices[i], i);

 	return 0;
 }

 subsys_initcall(topology_init);
	/*
	* Port on Texas Instruments TMS320C6x architecture
	*
	* Copyright (C) 2004, 2006, 2009, 2010, 2011 Texas Instruments Incorporated
	* Author: Aurelien Jacquiot (aurelien.jacquiot@jaluna.com)
	*
	* This program is free software; you can redistribute it and/or modify
	* it under the terms of the GNU General Public License version 2 as
	* published by the Free Software Foundation.
	*/
	#include <linux/dma-mapping.h>
	#include <linux/memblock.h>
	#include <linux/seq_file.h>
	#include <linux/bootmem.h>
	#include <linux/clkdev.h>
	#include <linux/initrd.h>
	#include <linux/kernel.h>
	#include <linux/module.h>
	#include <linux/of_fdt.h>
	#include <linux/string.h>
	#include <linux/errno.h>
	#include <linux/cache.h>
	#include <linux/delay.h>
	#include <linux/sched.h>
	#include <linux/clk.h>
	#include <linux/cpu.h>
	#include <linux/fs.h>
	#include <linux/of.h>


	#include <asm/sections.h>
	#include <asm/div64.h>
	#include <asm/setup.h>
	#include <asm/dscr.h>
	#include <asm/clock.h>
	#include <asm/soc.h>
	#include <asm/special_insns.h>

	static const char *c6x_soc_name;

	int c6x_num_cores;
	EXPORT_SYMBOL_GPL(c6x_num_cores);

	unsigned int c6x_silicon_rev;
	EXPORT_SYMBOL_GPL(c6x_silicon_rev);

	/*
	* Device status register. This holds information
	* about device configuration needed by some drivers.
	*/
	unsigned int c6x_devstat;
	EXPORT_SYMBOL_GPL(c6x_devstat);

	/*
	* Some SoCs have fuse registers holding a unique MAC
	* address. This is parsed out of the device tree with
	* the resulting MAC being held here.
	*/
	unsigned char c6x_fuse_mac[6];

	unsigned long memory_start;
	unsigned long memory_end;

	unsigned long ram_start;
	unsigned long ram_end;

	/* Uncached memory for DMA consistent use (memdma=) */
	static unsigned long dma_start __initdata;
	static unsigned long dma_size __initdata;

	struct cpuinfo_c6x {
	const char *cpu_name;
	const char *cpu_voltage;
	const char *mmu;
	const char *fpu;
	char *cpu_rev;
	unsigned int core_id;
	char __cpu_rev[5];
	};

	static DEFINE_PER_CPU(struct cpuinfo_c6x, cpu_data);

	unsigned int ticks_per_ns_scaled;
	EXPORT_SYMBOL(ticks_per_ns_scaled);

	unsigned int c6x_core_freq;

	static void __init get_cpuinfo(void)
	{
	unsigned cpu_id, rev_id, csr;
	struct clk *coreclk = clk_get_sys(NULL, "core");
	unsigned long core_khz;
	u64 tmp;
	struct cpuinfo_c6x *p;
	struct device_node node, np;

	p = &per_cpu(cpu_data, smp_processor_id());

	if (!IS_ERR(coreclk))
	c6x_core_freq = clk_get_rate(coreclk);
	else {
	printk(KERN_WARNING
	"Cannot find core clock frequency. Using 700MHz\n");
	c6x_core_freq = 700000000;
	}

	core_khz = c6x_core_freq / 1000;

	tmp = (uint64_t)core_khz << C6X_NDELAY_SCALE;
	do_div(tmp, 1000000);
	ticks_per_ns_scaled = tmp;

	csr = get_creg(CSR);
	cpu_id = csr >> 24;
	rev_id = (csr >> 16) & 0xff;

	p->mmu = "none";
	p->fpu = "none";
	p->cpu_voltage = "unknown";

	switch (cpu_id) {
	case 0:
	p->cpu_name = "C67x";
	p->fpu = "yes";
	break;
	case 2:
	p->cpu_name = "C62x";
	break;
	case 8:
	p->cpu_name = "C64x";
	break;
	case 12:
	p->cpu_name = "C64x";
	break;
	case 16:
	p->cpu_name = "C64x+";
	p->cpu_voltage = "1.2";
	break;
	case 21:
	p->cpu_name = "C66X";
	p->cpu_voltage = "1.2";
	break;
	default:
	p->cpu_name = "unknown";
	break;
	}

	if (cpu_id < 16) {
	switch (rev_id) {
	case 0x1:
	if (cpu_id > 8) {
	p->cpu_rev = "DM640/DM641/DM642/DM643";
	p->cpu_voltage = "1.2 - 1.4";
	} else {
	p->cpu_rev = "C6201";
	p->cpu_voltage = "2.5";
	}
	break;
	case 0x2:
	p->cpu_rev = "C6201B/C6202/C6211";
	p->cpu_voltage = "1.8";
	break;
	case 0x3:
	p->cpu_rev = "C6202B/C6203/C6204/C6205";
	p->cpu_voltage = "1.5";
	break;
	case 0x201:
	p->cpu_rev = "C6701 revision 0 (early CPU)";
	p->cpu_voltage = "1.8";
	break;
	case 0x202:
	p->cpu_rev = "C6701/C6711/C6712";
	p->cpu_voltage = "1.8";
	break;
	case 0x801:
	p->cpu_rev = "C64x";
	p->cpu_voltage = "1.5";
	break;
	default:
	p->cpu_rev = "unknown";
	}
	} else {
	p->cpu_rev = p->__cpu_rev;
	snprintf(p->__cpu_rev, sizeof(p->__cpu_rev), "0x%x", cpu_id);
	}

	p->core_id = get_coreid();

	node = of_find_node_by_name(NULL, "cpus");
	if (node) {
	for_each_child_of_node(node, np)
	if (!strcmp("cpu", np->name))
	++c6x_num_cores;
	of_node_put(node);
	}

	node = of_find_node_by_name(NULL, "soc");
	if (node) {
	if (of_property_read_string(node, "model", &c6x_soc_name))
	c6x_soc_name = "unknown";
	of_node_put(node);
	} else
	c6x_soc_name = "unknown";

	printk(KERN_INFO "CPU%d: %s rev %s, %s volts, %uMHz\n",
	p->core_id, p->cpu_name, p->cpu_rev,
	p->cpu_voltage, c6x_core_freq / 1000000);
	}

	/*
	* Early parsing of the command line
	*/
	static u32 mem_size __initdata;

	/* "mem=" parsing. */
	static int __init early_mem(char *p)
	{
	if (!p)
	return -EINVAL;

	mem_size = memparse(p, &p);
	/* don't remove all of memory when handling "mem={invalid}" */
	if (mem_size == 0)
	return -EINVAL;

	return 0;
	}
	early_param("mem", early_mem);

	/* "memdma=<size>[@<address>]" parsing. */
	static int __init early_memdma(char *p)
	{
	if (!p)
	return -EINVAL;

	dma_size = memparse(p, &p);
	if (*p == '@')
	dma_start = memparse(p, &p);

	return 0;
	}
	early_param("memdma", early_memdma);

	int __init c6x_add_memory(phys_addr_t start, unsigned long size)
	{
	static int ram_found __initdata;

	/* We only handle one bank (the one with PAGE_OFFSET) for now */
	if (ram_found)
	return -EINVAL;

	if (start > PAGE_OFFSET \|\| PAGE_OFFSET >= (start + size))
	return 0;

	ram_start = start;
	ram_end = start + size;

	ram_found = 1;
	return 0;
	}

	/*
	* Do early machine setup and device tree parsing. This is called very
	* early on the boot process.
	*/
	notrace void __init machine_init(unsigned long dt_ptr)
	{
	struct boot_param_header *dtb = __va(dt_ptr);
	struct boot_param_header fdt = (struct boot_param_header )_fdt_start;

	/* interrupts must be masked */
	set_creg(IER, 2);

	/*
	* Set the Interrupt Service Table (IST) to the beginning of the
	* vector table.
	*/
	set_ist(_vectors_start);

	lockdep_init();

	/*
	* dtb is passed in from bootloader.
	* fdt is linked in blob.
	*/
	if (dtb && dtb != fdt)
	fdt = dtb;

	/* Do some early initialization based on the flat device tree */
	early_init_dt_scan(fdt);

	parse_early_param();
	}

	void __init setup_arch(char **cmdline_p)
	{
	int bootmap_size;
	struct memblock_region *reg;

	printk(KERN_INFO "Initializing kernel\n");

	/* Initialize command line */
	*cmdline_p = boot_command_line;

	memory_end = ram_end;
	memory_end &= ~(PAGE_SIZE - 1);

	if (mem_size && (PAGE_OFFSET + PAGE_ALIGN(mem_size)) < memory_end)
	memory_end = PAGE_OFFSET + PAGE_ALIGN(mem_size);

	/* add block that this kernel can use */
	memblock_add(PAGE_OFFSET, memory_end - PAGE_OFFSET);

	/* reserve kernel text/data/bss */
	memblock_reserve(PAGE_OFFSET,
	PAGE_ALIGN((unsigned long)&_end - PAGE_OFFSET));

	if (dma_size) {
	/* align to cacheability granularity */
	dma_size = CACHE_REGION_END(dma_size);

	if (!dma_start)
	dma_start = memory_end - dma_size;

	/* align to cacheability granularity */
	dma_start = CACHE_REGION_START(dma_start);

	/* reserve DMA memory taken from kernel memory */
	if (memblock_is_region_memory(dma_start, dma_size))
	memblock_reserve(dma_start, dma_size);
	}

	memory_start = PAGE_ALIGN((unsigned int) &_end);

	printk(KERN_INFO "Memory Start=%08lx, Memory End=%08lx\n",
	memory_start, memory_end);

	#ifdef CONFIG_BLK_DEV_INITRD
	/*
	* Reserve initrd memory if in kernel memory.
	*/
	if (initrd_start < initrd_end)
	if (memblock_is_region_memory(initrd_start,
	initrd_end - initrd_start))
	memblock_reserve(initrd_start,
	initrd_end - initrd_start);
	#endif

	init_mm.start_code = (unsigned long) &_stext;
	init_mm.end_code = (unsigned long) &_etext;
	init_mm.end_data = memory_start;
	init_mm.brk = memory_start;

	/*
	* Give all the memory to the bootmap allocator, tell it to put the
	* boot mem_map at the start of memory
	*/
	bootmap_size = init_bootmem_node(NODE_DATA(0),
	memory_start >> PAGE_SHIFT,
	PAGE_OFFSET >> PAGE_SHIFT,
	memory_end >> PAGE_SHIFT);
	memblock_reserve(memory_start, bootmap_size);

	unflatten_device_tree();

	c6x_cache_init();

	/* Set the whole external memory as non-cacheable */
	disable_caching(ram_start, ram_end - 1);

	/* Set caching of external RAM used by Linux */
	for_each_memblock(memory, reg)
	enable_caching(CACHE_REGION_START(reg->base),
	CACHE_REGION_START(reg->base + reg->size - 1));

	#ifdef CONFIG_BLK_DEV_INITRD
	/*
	* Enable caching for initrd which falls outside kernel memory.
	*/
	if (initrd_start < initrd_end) {
	if (!memblock_is_region_memory(initrd_start,
	initrd_end - initrd_start))
	enable_caching(CACHE_REGION_START(initrd_start),
	CACHE_REGION_START(initrd_end - 1));
	}
	#endif

	/*
	* Disable caching for dma coherent memory taken from kernel memory.
	*/
	if (dma_size && memblock_is_region_memory(dma_start, dma_size))
	disable_caching(dma_start,
	CACHE_REGION_START(dma_start + dma_size - 1));

	/* Initialize the coherent memory allocator */
	coherent_mem_init(dma_start, dma_size);

	/*
	* Free all memory as a starting point.
	*/
	free_bootmem(PAGE_OFFSET, memory_end - PAGE_OFFSET);

	/*
	* Then reserve memory which is already being used.
	*/
	for_each_memblock(reserved, reg) {
	pr_debug("reserved - 0x%08x-0x%08x\n",
	(u32) reg->base, (u32) reg->size);
	reserve_bootmem(reg->base, reg->size, BOOTMEM_DEFAULT);
	}

	max_low_pfn = PFN_DOWN(memory_end);
	min_low_pfn = PFN_UP(memory_start);
	max_mapnr = max_low_pfn - min_low_pfn;

	/* Get kmalloc into gear */
	paging_init();

	/*
	* Probe for Device State Configuration Registers.
	* We have to do this early in case timer needs to be enabled
	* through DSCR.
	*/
	dscr_probe();

	/* We do this early for timer and core clock frequency */
	c64x_setup_clocks();

	/* Get CPU info */
	get_cpuinfo();

	#if defined(CONFIG_VT) && defined(CONFIG_DUMMY_CONSOLE)
	conswitchp = &dummy_con;
	#endif
	}

	#define cpu_to_ptr(n) ((void *)((long)(n)+1))
	#define ptr_to_cpu(p) ((long)(p) - 1)

	static int show_cpuinfo(struct seq_file m, void v)
	{
	int n = ptr_to_cpu(v);
	struct cpuinfo_c6x *p = &per_cpu(cpu_data, n);

	if (n == 0) {
	seq_printf(m,
	"soc\t\t: %s\n"
	"soc revision\t: 0x%x\n"
	"soc cores\t: %d\n",
	c6x_soc_name, c6x_silicon_rev, c6x_num_cores);
	}

	seq_printf(m,
	"\n"
	"processor\t: %d\n"
	"cpu\t\t: %s\n"
	"core revision\t: %s\n"
	"core voltage\t: %s\n"
	"core id\t\t: %d\n"
	"mmu\t\t: %s\n"
	"fpu\t\t: %s\n"
	"cpu MHz\t\t: %u\n"
	"bogomips\t: %lu.%02lu\n\n",
	n,
	p->cpu_name, p->cpu_rev, p->cpu_voltage,
	p->core_id, p->mmu, p->fpu,
	(c6x_core_freq + 500000) / 1000000,
	(loops_per_jiffy/(500000/HZ)),
	(loops_per_jiffy/(5000/HZ))%100);

	return 0;
	}

	static void c_start(struct seq_file m, loff_t *pos)
	{
	return pos < nr_cpu_ids ? cpu_to_ptr(pos) : NULL;
	}
	static void c_next(struct seq_file m, void v, loff_t pos)
	{
	++*pos;
	return NULL;
	}
	static void c_stop(struct seq_file m, void v)
	{
	}

	const struct seq_operations cpuinfo_op = {
	c_start,
	c_stop,
	c_next,
	show_cpuinfo
	};

	static struct cpu cpu_devices[NR_CPUS];

	static int __init topology_init(void)
	{
	int i;

	for_each_present_cpu(i)
	register_cpu(&cpu_devices[i], i);

	return 0;
	}

	subsys_initcall(topology_init);