diff options
Diffstat (limited to 'arch/sh64/kernel/setup.c')
| -rw-r--r-- | arch/sh64/kernel/setup.c | 385 |
1 files changed, 385 insertions, 0 deletions
diff --git a/arch/sh64/kernel/setup.c b/arch/sh64/kernel/setup.c new file mode 100644 index 000000000000..c7a7b816a30f --- /dev/null +++ b/arch/sh64/kernel/setup.c @@ -0,0 +1,385 @@ +/* + * 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. + * + * arch/sh64/kernel/setup.c + * + * sh64 Arch Support + * + * This file handles the architecture-dependent parts of initialization + * + * Copyright (C) 2000, 2001 Paolo Alberelli + * Copyright (C) 2003, 2004 Paul Mundt + * + * benedict.gaster@superh.com: 2nd May 2002 + * Modified to use the empty_zero_page to pass command line arguments. + * + * benedict.gaster@superh.com: 3rd May 2002 + * Added support for ramdisk, removing statically linked romfs at the same time. + * + * lethal@linux-sh.org: 15th May 2003 + * Added generic procfs cpuinfo reporting. Make boards just export their name. + * + * lethal@linux-sh.org: 25th May 2003 + * Added generic get_cpu_subtype() for subtype reporting from cpu_data->type. + * + */ +#include <linux/errno.h> +#include <linux/rwsem.h> +#include <linux/sched.h> +#include <linux/kernel.h> +#include <linux/mm.h> +#include <linux/stddef.h> +#include <linux/unistd.h> +#include <linux/ptrace.h> +#include <linux/slab.h> +#include <linux/user.h> +#include <linux/a.out.h> +#include <linux/tty.h> +#include <linux/ioport.h> +#include <linux/delay.h> +#include <linux/config.h> +#include <linux/init.h> +#include <linux/seq_file.h> +#include <linux/blkdev.h> +#include <linux/bootmem.h> +#include <linux/console.h> +#include <linux/root_dev.h> +#include <linux/cpu.h> +#include <linux/initrd.h> +#include <asm/processor.h> +#include <asm/page.h> +#include <asm/pgtable.h> +#include <asm/platform.h> +#include <asm/uaccess.h> +#include <asm/system.h> +#include <asm/io.h> +#include <asm/sections.h> +#include <asm/setup.h> +#include <asm/smp.h> + +#ifdef CONFIG_VT +#include <linux/console.h> +#endif + +struct screen_info screen_info; + +#ifdef CONFIG_BLK_DEV_RAM +extern int rd_doload; /* 1 = load ramdisk, 0 = don't load */ +extern int rd_prompt; /* 1 = prompt for ramdisk, 0 = don't prompt */ +extern int rd_image_start; /* starting block # of image */ +#endif + +extern int root_mountflags; +extern char *get_system_type(void); +extern void platform_setup(void); +extern void platform_monitor(void); +extern void platform_reserve(void); +extern int sh64_cache_init(void); +extern int sh64_tlb_init(void); + +#define RAMDISK_IMAGE_START_MASK 0x07FF +#define RAMDISK_PROMPT_FLAG 0x8000 +#define RAMDISK_LOAD_FLAG 0x4000 + +static char command_line[COMMAND_LINE_SIZE] = { 0, }; +unsigned long long memory_start = CONFIG_MEMORY_START; +unsigned long long memory_end = CONFIG_MEMORY_START + (CONFIG_MEMORY_SIZE_IN_MB * 1024 * 1024); + +struct sh_cpuinfo boot_cpu_data; + +static inline void parse_mem_cmdline (char ** cmdline_p) +{ + char c = ' ', *to = command_line, *from = COMMAND_LINE; + int len = 0; + + /* Save unparsed command line copy for /proc/cmdline */ + memcpy(saved_command_line, COMMAND_LINE, COMMAND_LINE_SIZE); + saved_command_line[COMMAND_LINE_SIZE-1] = '\0'; + + for (;;) { + /* + * "mem=XXX[kKmM]" defines a size of memory. + */ + if (c == ' ' && !memcmp(from, "mem=", 4)) { + if (to != command_line) + to--; + { + unsigned long mem_size; + + mem_size = memparse(from+4, &from); + memory_end = memory_start + mem_size; + } + } + c = *(from++); + if (!c) + break; + if (COMMAND_LINE_SIZE <= ++len) + break; + *(to++) = c; + } + *to = '\0'; + + *cmdline_p = command_line; +} + +static void __init sh64_cpu_type_detect(void) +{ + extern unsigned long long peek_real_address_q(unsigned long long addr); + unsigned long long cir; + /* Do peeks in real mode to avoid having to set up a mapping for the + WPC registers. On SH5-101 cut2, such a mapping would be exposed to + an address translation erratum which would make it hard to set up + correctly. */ + cir = peek_real_address_q(0x0d000008); + + if ((cir & 0xffff) == 0x5103) { + boot_cpu_data.type = CPU_SH5_103; + } else if (((cir >> 32) & 0xffff) == 0x51e2) { + /* CPU.VCR aliased at CIR address on SH5-101 */ + boot_cpu_data.type = CPU_SH5_101; + } else { + boot_cpu_data.type = CPU_SH_NONE; + } +} + +void __init setup_arch(char **cmdline_p) +{ + unsigned long bootmap_size, i; + unsigned long first_pfn, start_pfn, last_pfn, pages; + +#ifdef CONFIG_EARLY_PRINTK + extern void enable_early_printk(void); + + /* + * Setup Early SCIF console + */ + enable_early_printk(); +#endif + + /* + * Setup TLB mappings + */ + sh64_tlb_init(); + + /* + * Caches are already initialized by the time we get here, so we just + * fill in cpu_data info for the caches. + */ + sh64_cache_init(); + + platform_setup(); + platform_monitor(); + + sh64_cpu_type_detect(); + + ROOT_DEV = old_decode_dev(ORIG_ROOT_DEV); + +#ifdef CONFIG_BLK_DEV_RAM + rd_image_start = RAMDISK_FLAGS & RAMDISK_IMAGE_START_MASK; + rd_prompt = ((RAMDISK_FLAGS & RAMDISK_PROMPT_FLAG) != 0); + rd_doload = ((RAMDISK_FLAGS & RAMDISK_LOAD_FLAG) != 0); +#endif + + if (!MOUNT_ROOT_RDONLY) + root_mountflags &= ~MS_RDONLY; + init_mm.start_code = (unsigned long) _text; + init_mm.end_code = (unsigned long) _etext; + init_mm.end_data = (unsigned long) _edata; + init_mm.brk = (unsigned long) _end; + + code_resource.start = __pa(_text); + code_resource.end = __pa(_etext)-1; + data_resource.start = __pa(_etext); + data_resource.end = __pa(_edata)-1; + + parse_mem_cmdline(cmdline_p); + + /* + * Find the lowest and highest page frame numbers we have available + */ + first_pfn = PFN_DOWN(memory_start); + last_pfn = PFN_DOWN(memory_end); + pages = last_pfn - first_pfn; + + /* + * Partially used pages are not usable - thus + * we are rounding upwards: + */ + start_pfn = PFN_UP(__pa(_end)); + + /* + * Find a proper area for the bootmem bitmap. After this + * bootstrap step all allocations (until the page allocator + * is intact) must be done via bootmem_alloc(). + */ + bootmap_size = init_bootmem_node(NODE_DATA(0), start_pfn, + first_pfn, + last_pfn); + /* + * Round it up. + */ + bootmap_size = PFN_PHYS(PFN_UP(bootmap_size)); + + /* + * Register fully available RAM pages with the bootmem allocator. + */ + free_bootmem_node(NODE_DATA(0), PFN_PHYS(first_pfn), PFN_PHYS(pages)); + + /* + * Reserve all kernel sections + bootmem bitmap + a guard page. + */ + reserve_bootmem_node(NODE_DATA(0), PFN_PHYS(first_pfn), + (PFN_PHYS(start_pfn) + bootmap_size + PAGE_SIZE) - PFN_PHYS(first_pfn)); + + /* + * Reserve platform dependent sections + */ + platform_reserve(); + +#ifdef CONFIG_BLK_DEV_INITRD + if (LOADER_TYPE && INITRD_START) { + if (INITRD_START + INITRD_SIZE <= (PFN_PHYS(last_pfn))) { + reserve_bootmem_node(NODE_DATA(0), INITRD_START + __MEMORY_START, INITRD_SIZE); + + initrd_start = + (long) INITRD_START ? INITRD_START + PAGE_OFFSET + __MEMORY_START : 0; + + initrd_end = initrd_start + INITRD_SIZE; + } else { + printk("initrd extends beyond end of memory " + "(0x%08lx > 0x%08lx)\ndisabling initrd\n", + (long) INITRD_START + INITRD_SIZE, + PFN_PHYS(last_pfn)); + initrd_start = 0; + } + } +#endif + + /* + * Claim all RAM, ROM, and I/O resources. + */ + + /* Kernel RAM */ + request_resource(&iomem_resource, &code_resource); + request_resource(&iomem_resource, &data_resource); + + /* Other KRAM space */ + for (i = 0; i < STANDARD_KRAM_RESOURCES - 2; i++) + request_resource(&iomem_resource, + &platform_parms.kram_res_p[i]); + + /* XRAM space */ + for (i = 0; i < STANDARD_XRAM_RESOURCES; i++) + request_resource(&iomem_resource, + &platform_parms.xram_res_p[i]); + + /* ROM space */ + for (i = 0; i < STANDARD_ROM_RESOURCES; i++) + request_resource(&iomem_resource, + &platform_parms.rom_res_p[i]); + + /* I/O space */ + for (i = 0; i < STANDARD_IO_RESOURCES; i++) + request_resource(&ioport_resource, + &platform_parms.io_res_p[i]); + + +#ifdef CONFIG_VT +#if defined(CONFIG_VGA_CONSOLE) + conswitchp = &vga_con; +#elif defined(CONFIG_DUMMY_CONSOLE) + conswitchp = &dummy_con; +#endif +#endif + + printk("Hardware FPU: %s\n", fpu_in_use ? "enabled" : "disabled"); + + paging_init(); +} + +void __xchg_called_with_bad_pointer(void) +{ + printk(KERN_EMERG "xchg() called with bad pointer !\n"); +} + +static struct cpu cpu[1]; + +static int __init topology_init(void) +{ + return register_cpu(cpu, 0, NULL); +} + +subsys_initcall(topology_init); + +/* + * Get CPU information + */ +static const char *cpu_name[] = { + [CPU_SH5_101] = "SH5-101", + [CPU_SH5_103] = "SH5-103", + [CPU_SH_NONE] = "Unknown", +}; + +const char *get_cpu_subtype(void) +{ + return cpu_name[boot_cpu_data.type]; +} + +#ifdef CONFIG_PROC_FS +static int show_cpuinfo(struct seq_file *m,void *v) +{ + unsigned int cpu = smp_processor_id(); + + if (!cpu) + seq_printf(m, "machine\t\t: %s\n", get_system_type()); + + seq_printf(m, "processor\t: %d\n", cpu); + seq_printf(m, "cpu family\t: SH-5\n"); + seq_printf(m, "cpu type\t: %s\n", get_cpu_subtype()); + + seq_printf(m, "icache size\t: %dK-bytes\n", + (boot_cpu_data.icache.ways * + boot_cpu_data.icache.sets * + boot_cpu_data.icache.linesz) >> 10); + seq_printf(m, "dcache size\t: %dK-bytes\n", + (boot_cpu_data.dcache.ways * + boot_cpu_data.dcache.sets * + boot_cpu_data.dcache.linesz) >> 10); + seq_printf(m, "itlb entries\t: %d\n", boot_cpu_data.itlb.entries); + seq_printf(m, "dtlb entries\t: %d\n", boot_cpu_data.dtlb.entries); + +#define PRINT_CLOCK(name, value) \ + seq_printf(m, name " clock\t: %d.%02dMHz\n", \ + ((value) / 1000000), ((value) % 1000000)/10000) + + PRINT_CLOCK("cpu", boot_cpu_data.cpu_clock); + PRINT_CLOCK("bus", boot_cpu_data.bus_clock); + PRINT_CLOCK("module", boot_cpu_data.module_clock); + + seq_printf(m, "bogomips\t: %lu.%02lu\n\n", + (loops_per_jiffy*HZ+2500)/500000, + ((loops_per_jiffy*HZ+2500)/5000) % 100); + + return 0; +} + +static void *c_start(struct seq_file *m, loff_t *pos) +{ + return (void*)(*pos == 0); +} +static void *c_next(struct seq_file *m, void *v, loff_t *pos) +{ + return NULL; +} +static void c_stop(struct seq_file *m, void *v) +{ +} +struct seq_operations cpuinfo_op = { + .start = c_start, + .next = c_next, + .stop = c_stop, + .show = show_cpuinfo, +}; +#endif /* CONFIG_PROC_FS */ |