arch/microblaze/kernel/setup.c - linux - Git at Google

 /*
  * Copyright (C) 2007-2009 Michal Simek <monstr@monstr.eu>
  * Copyright (C) 2007-2009 PetaLogix
  * Copyright (C) 2006 Atmark Techno, Inc.
  *
  * 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.
  */

 #include <linux/init.h>
 #include <linux/clocksource.h>
 #include <linux/string.h>
 #include <linux/seq_file.h>
 #include <linux/cpu.h>
 #include <linux/initrd.h>
 #include <linux/console.h>
 #include <linux/debugfs.h>
 #include <linux/of_fdt.h>

 #include <asm/setup.h>
 #include <asm/sections.h>
 #include <asm/page.h>
 #include <linux/io.h>
 #include <linux/bug.h>
 #include <linux/param.h>
 #include <linux/pci.h>
 #include <linux/cache.h>
 #include <linux/of_platform.h>
 #include <linux/dma-mapping.h>
 #include <asm/cacheflush.h>
 #include <asm/entry.h>
 #include <asm/cpuinfo.h>

 #include <asm/prom.h>
 #include <asm/pgtable.h>

 DEFINE_PER_CPU(unsigned int, KSP);	/* Saved kernel stack pointer */
 DEFINE_PER_CPU(unsigned int, KM);	/* Kernel/user mode */
 DEFINE_PER_CPU(unsigned int, ENTRY_SP);	/* Saved SP on kernel entry */
 DEFINE_PER_CPU(unsigned int, R11_SAVE);	/* Temp variable for entry */
 DEFINE_PER_CPU(unsigned int, CURRENT_SAVE);	/* Saved current pointer */

 unsigned int boot_cpuid;
 /*
  * Placed cmd_line to .data section because can be initialized from
  * ASM code. Default position is BSS section which is cleared
  * in machine_early_init().
  */
 char cmd_line[COMMAND_LINE_SIZE] __attribute__ ((section(".data")));

 void __init setup_arch(char **cmdline_p)
 {
 	*cmdline_p = boot_command_line;

 	console_verbose();

 	unflatten_device_tree();

 	setup_cpuinfo();

 	microblaze_cache_init();

 	setup_memory();

 #ifdef CONFIG_EARLY_PRINTK
 	/* remap early console to virtual address */
 	remap_early_printk();
 #endif

 	xilinx_pci_init();

 #ifdef CONFIG_VT
 #if defined(CONFIG_XILINX_CONSOLE)
 	conswitchp = &xil_con;
 #elif defined(CONFIG_DUMMY_CONSOLE)
 	conswitchp = &dummy_con;
 #endif
 #endif
 }

 #ifdef CONFIG_MTD_UCLINUX
 /* Handle both romfs and cramfs types, without generating unnecessary
  code (ie no point checking for CRAMFS if it's not even enabled) */
 inline unsigned get_romfs_len(unsigned *addr)
 {
 #ifdef CONFIG_ROMFS_FS
 	if (memcmp(&addr[0], "-rom1fs-", 8) == 0) /* romfs */
 		return be32_to_cpu(addr[2]);
 #endif

 #ifdef CONFIG_CRAMFS
 	if (addr[0] == le32_to_cpu(0x28cd3d45)) /* cramfs */
 		return le32_to_cpu(addr[1]);
 #endif
 	return 0;
 }
 #endif	/* CONFIG_MTD_UCLINUX_EBSS */

 unsigned long kernel_tlb;

 void __init machine_early_init(const char *cmdline, unsigned int ram,
 		unsigned int fdt, unsigned int msr, unsigned int tlb0,
 		unsigned int tlb1)
 {
 	unsigned long *src, *dst;
 	unsigned int offset = 0;

 	/* If CONFIG_MTD_UCLINUX is defined, assume ROMFS is at the
 	 * end of kernel. There are two position which we want to check.
 	 * The first is __init_end and the second __bss_start.
 	 */
 #ifdef CONFIG_MTD_UCLINUX
 	int romfs_size;
 	unsigned int romfs_base;
 	char *old_klimit = klimit;

 	romfs_base = (ram ? ram : (unsigned int)&__init_end);
 	romfs_size = PAGE_ALIGN(get_romfs_len((unsigned *)romfs_base));
 	if (!romfs_size) {
 		romfs_base = (unsigned int)&__bss_start;
 		romfs_size = PAGE_ALIGN(get_romfs_len((unsigned *)romfs_base));
 	}

 	/* Move ROMFS out of BSS before clearing it */
 	if (romfs_size > 0) {
 		memmove(&__bss_stop, (int *)romfs_base, romfs_size);
 		klimit += romfs_size;
 	}
 #endif

 /* clearing bss section */
 	memset(__bss_start, 0, __bss_stop-__bss_start);
 	memset(_ssbss, 0, _esbss-_ssbss);

 	lockdep_init();

 /* initialize device tree for usage in early_printk */
 	early_init_devtree((void *)_fdt_start);

 #ifdef CONFIG_EARLY_PRINTK
 	setup_early_printk(NULL);
 #endif

 	/* setup kernel_tlb after BSS cleaning
 	 * Maybe worth to move to asm code */
 	kernel_tlb = tlb0 + tlb1;
 	/* printk("TLB1 0x%08x, TLB0 0x%08x, tlb 0x%x\n", tlb0,
 							tlb1, kernel_tlb); */

 	pr_info("Ramdisk addr 0x%08x, ", ram);
 	if (fdt)
 		pr_info("FDT at 0x%08x\n", fdt);
 	else
 		pr_info("Compiled-in FDT at 0x%08x\n",
 					(unsigned int)_fdt_start);

 #ifdef CONFIG_MTD_UCLINUX
 	pr_info("Found romfs @ 0x%08x (0x%08x)\n",
 			romfs_base, romfs_size);
 	pr_info("#### klimit %p ####\n", old_klimit);
 	BUG_ON(romfs_size < 0); /* What else can we do? */

 	pr_info("Moved 0x%08x bytes from 0x%08x to 0x%08x\n",
 			romfs_size, romfs_base, (unsigned)&__bss_stop);

 	pr_info("New klimit: 0x%08x\n", (unsigned)klimit);
 #endif

 #if CONFIG_XILINX_MICROBLAZE0_USE_MSR_INSTR
 	if (msr) {
 		pr_info("!!!Your kernel has setup MSR instruction but ");
 		pr_cont("CPU don't have it %x\n", msr);
 	}
 #else
 	if (!msr) {
 		pr_info("!!!Your kernel not setup MSR instruction but ");
 		pr_cont"CPU have it %x\n", msr);
 	}
 #endif

 	/* Do not copy reset vectors. offset = 0x2 means skip the first
 	 * two instructions. dst is pointer to MB vectors which are placed
 	 * in block ram. If you want to copy reset vector setup offset to 0x0 */
 #if !CONFIG_MANUAL_RESET_VECTOR
 	offset = 0x2;
 #endif
 	dst = (unsigned long *) (offset * sizeof(u32));
 	for (src = __ivt_start + offset; src < __ivt_end; src++, dst++)
 		*dst = *src;

 	/* Initialize global data */
 	per_cpu(KM, 0) = 0x1;	/* We start in kernel mode */
 	per_cpu(CURRENT_SAVE, 0) = (unsigned long)current;
 }

 void __init time_init(void)
 {
 	clocksource_of_init();
 }

 #ifdef CONFIG_DEBUG_FS
 struct dentry *of_debugfs_root;

 static int microblaze_debugfs_init(void)
 {
 	of_debugfs_root = debugfs_create_dir("microblaze", NULL);

 	return of_debugfs_root == NULL;
 }
 arch_initcall(microblaze_debugfs_init);

 # ifdef CONFIG_MMU
 static int __init debugfs_tlb(void)
 {
 	struct dentry *d;

 	if (!of_debugfs_root)
 		return -ENODEV;

 	d = debugfs_create_u32("tlb_skip", S_IRUGO, of_debugfs_root, &tlb_skip);
 	if (!d)
 		return -ENOMEM;

 	return 0;
 }
 device_initcall(debugfs_tlb);
 # endif
 #endif

 static int dflt_bus_notify(struct notifier_block *nb,
 				unsigned long action, void *data)
 {
 	struct device *dev = data;

 	/* We are only intereted in device addition */
 	if (action != BUS_NOTIFY_ADD_DEVICE)
 		return 0;

 	set_dma_ops(dev, &dma_direct_ops);

 	return NOTIFY_DONE;
 }

 static struct notifier_block dflt_plat_bus_notifier = {
 	.notifier_call = dflt_bus_notify,
 	.priority = INT_MAX,
 };

 static int __init setup_bus_notifier(void)
 {
 	bus_register_notifier(&platform_bus_type, &dflt_plat_bus_notifier);

 	return 0;
 }

 arch_initcall(setup_bus_notifier);
	/*
	* Copyright (C) 2007-2009 Michal Simek <monstr@monstr.eu>
	* Copyright (C) 2007-2009 PetaLogix
	* Copyright (C) 2006 Atmark Techno, Inc.
	*
	* 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.
	*/

	#include <linux/init.h>
	#include <linux/clocksource.h>
	#include <linux/string.h>
	#include <linux/seq_file.h>
	#include <linux/cpu.h>
	#include <linux/initrd.h>
	#include <linux/console.h>
	#include <linux/debugfs.h>
	#include <linux/of_fdt.h>

	#include <asm/setup.h>
	#include <asm/sections.h>
	#include <asm/page.h>
	#include <linux/io.h>
	#include <linux/bug.h>
	#include <linux/param.h>
	#include <linux/pci.h>
	#include <linux/cache.h>
	#include <linux/of_platform.h>
	#include <linux/dma-mapping.h>
	#include <asm/cacheflush.h>
	#include <asm/entry.h>
	#include <asm/cpuinfo.h>

	#include <asm/prom.h>
	#include <asm/pgtable.h>

	DEFINE_PER_CPU(unsigned int, KSP); /* Saved kernel stack pointer */
	DEFINE_PER_CPU(unsigned int, KM); /* Kernel/user mode */
	DEFINE_PER_CPU(unsigned int, ENTRY_SP); /* Saved SP on kernel entry */
	DEFINE_PER_CPU(unsigned int, R11_SAVE); /* Temp variable for entry */
	DEFINE_PER_CPU(unsigned int, CURRENT_SAVE); /* Saved current pointer */

	unsigned int boot_cpuid;
	/*
	* Placed cmd_line to .data section because can be initialized from
	* ASM code. Default position is BSS section which is cleared
	* in machine_early_init().
	*/
	char cmd_line[COMMAND_LINE_SIZE] __attribute__ ((section(".data")));

	void __init setup_arch(char **cmdline_p)
	{
	*cmdline_p = boot_command_line;

	console_verbose();

	unflatten_device_tree();

	setup_cpuinfo();

	microblaze_cache_init();

	setup_memory();

	#ifdef CONFIG_EARLY_PRINTK
	/* remap early console to virtual address */
	remap_early_printk();
	#endif

	xilinx_pci_init();

	#ifdef CONFIG_VT
	#if defined(CONFIG_XILINX_CONSOLE)
	conswitchp = &xil_con;
	#elif defined(CONFIG_DUMMY_CONSOLE)
	conswitchp = &dummy_con;
	#endif
	#endif
	}

	#ifdef CONFIG_MTD_UCLINUX
	/* Handle both romfs and cramfs types, without generating unnecessary
	code (ie no point checking for CRAMFS if it's not even enabled) */
	inline unsigned get_romfs_len(unsigned *addr)
	{
	#ifdef CONFIG_ROMFS_FS
	if (memcmp(&addr[0], "-rom1fs-", 8) == 0) /* romfs */
	return be32_to_cpu(addr[2]);
	#endif

	#ifdef CONFIG_CRAMFS
	if (addr[0] == le32_to_cpu(0x28cd3d45)) /* cramfs */
	return le32_to_cpu(addr[1]);
	#endif
	return 0;
	}
	#endif /* CONFIG_MTD_UCLINUX_EBSS */

	unsigned long kernel_tlb;

	void __init machine_early_init(const char *cmdline, unsigned int ram,
	unsigned int fdt, unsigned int msr, unsigned int tlb0,
	unsigned int tlb1)
	{
	unsigned long src, dst;
	unsigned int offset = 0;

	/* If CONFIG_MTD_UCLINUX is defined, assume ROMFS is at the
	* end of kernel. There are two position which we want to check.
	* The first is __init_end and the second __bss_start.
	*/
	#ifdef CONFIG_MTD_UCLINUX
	int romfs_size;
	unsigned int romfs_base;
	char *old_klimit = klimit;

	romfs_base = (ram ? ram : (unsigned int)&__init_end);
	romfs_size = PAGE_ALIGN(get_romfs_len((unsigned *)romfs_base));
	if (!romfs_size) {
	romfs_base = (unsigned int)&__bss_start;
	romfs_size = PAGE_ALIGN(get_romfs_len((unsigned *)romfs_base));
	}

	/* Move ROMFS out of BSS before clearing it */
	if (romfs_size > 0) {
	memmove(&__bss_stop, (int *)romfs_base, romfs_size);
	klimit += romfs_size;
	}
	#endif

	/* clearing bss section */
	memset(__bss_start, 0, __bss_stop-__bss_start);
	memset(_ssbss, 0, _esbss-_ssbss);

	lockdep_init();

	/* initialize device tree for usage in early_printk */
	early_init_devtree((void *)_fdt_start);

	#ifdef CONFIG_EARLY_PRINTK
	setup_early_printk(NULL);
	#endif

	/* setup kernel_tlb after BSS cleaning
	* Maybe worth to move to asm code */
	kernel_tlb = tlb0 + tlb1;
	/* printk("TLB1 0x%08x, TLB0 0x%08x, tlb 0x%x\n", tlb0,
	tlb1, kernel_tlb); */

	pr_info("Ramdisk addr 0x%08x, ", ram);
	if (fdt)
	pr_info("FDT at 0x%08x\n", fdt);
	else
	pr_info("Compiled-in FDT at 0x%08x\n",
	(unsigned int)_fdt_start);

	#ifdef CONFIG_MTD_UCLINUX
	pr_info("Found romfs @ 0x%08x (0x%08x)\n",
	romfs_base, romfs_size);
	pr_info("#### klimit %p ####\n", old_klimit);
	BUG_ON(romfs_size < 0); /* What else can we do? */

	pr_info("Moved 0x%08x bytes from 0x%08x to 0x%08x\n",
	romfs_size, romfs_base, (unsigned)&__bss_stop);

	pr_info("New klimit: 0x%08x\n", (unsigned)klimit);
	#endif

	#if CONFIG_XILINX_MICROBLAZE0_USE_MSR_INSTR
	if (msr) {
	pr_info("!!!Your kernel has setup MSR instruction but ");
	pr_cont("CPU don't have it %x\n", msr);
	}
	#else
	if (!msr) {
	pr_info("!!!Your kernel not setup MSR instruction but ");
	pr_cont"CPU have it %x\n", msr);
	}
	#endif

	/* Do not copy reset vectors. offset = 0x2 means skip the first
	* two instructions. dst is pointer to MB vectors which are placed
	* in block ram. If you want to copy reset vector setup offset to 0x0 */
	#if !CONFIG_MANUAL_RESET_VECTOR
	offset = 0x2;
	#endif
	dst = (unsigned long ) (offset sizeof(u32));
	for (src = __ivt_start + offset; src < __ivt_end; src++, dst++)
	dst = src;

	/* Initialize global data */
	per_cpu(KM, 0) = 0x1; /* We start in kernel mode */
	per_cpu(CURRENT_SAVE, 0) = (unsigned long)current;
	}

	void __init time_init(void)
	{
	clocksource_of_init();
	}

	#ifdef CONFIG_DEBUG_FS
	struct dentry *of_debugfs_root;

	static int microblaze_debugfs_init(void)
	{
	of_debugfs_root = debugfs_create_dir("microblaze", NULL);

	return of_debugfs_root == NULL;
	}
	arch_initcall(microblaze_debugfs_init);

	# ifdef CONFIG_MMU
	static int __init debugfs_tlb(void)
	{
	struct dentry *d;

	if (!of_debugfs_root)
	return -ENODEV;

	d = debugfs_create_u32("tlb_skip", S_IRUGO, of_debugfs_root, &tlb_skip);
	if (!d)
	return -ENOMEM;

	return 0;
	}
	device_initcall(debugfs_tlb);
	# endif
	#endif

	static int dflt_bus_notify(struct notifier_block *nb,
	unsigned long action, void *data)
	{
	struct device *dev = data;

	/* We are only intereted in device addition */
	if (action != BUS_NOTIFY_ADD_DEVICE)
	return 0;

	set_dma_ops(dev, &dma_direct_ops);

	return NOTIFY_DONE;
	}

	static struct notifier_block dflt_plat_bus_notifier = {
	.notifier_call = dflt_bus_notify,
	.priority = INT_MAX,
	};

	static int __init setup_bus_notifier(void)
	{
	bus_register_notifier(&platform_bus_type, &dflt_plat_bus_notifier);

	return 0;
	}

	arch_initcall(setup_bus_notifier);