diff options
Diffstat (limited to 'arch/sh/kernel/setup.c')
| -rw-r--r-- | arch/sh/kernel/setup.c | 649 |
1 files changed, 649 insertions, 0 deletions
diff --git a/arch/sh/kernel/setup.c b/arch/sh/kernel/setup.c new file mode 100644 index 0000000..25b9d9e --- /dev/null +++ b/arch/sh/kernel/setup.c @@ -0,0 +1,649 @@ +/* $Id: setup.c,v 1.30 2003/10/13 07:21:19 lethal Exp $ + * + * linux/arch/sh/kernel/setup.c + * + * Copyright (C) 1999 Niibe Yutaka + * Copyright (C) 2002, 2003 Paul Mundt + */ + +/* + * This file handles the architecture-dependent parts of initialization + */ + +#include <linux/tty.h> +#include <linux/ioport.h> +#include <linux/init.h> +#include <linux/initrd.h> +#include <linux/bootmem.h> +#include <linux/console.h> +#include <linux/seq_file.h> +#include <linux/root_dev.h> +#include <linux/utsname.h> +#include <linux/cpu.h> +#include <asm/uaccess.h> +#include <asm/io.h> +#include <asm/io_generic.h> +#include <asm/sections.h> +#include <asm/irq.h> +#include <asm/setup.h> + +#ifdef CONFIG_SH_KGDB +#include <asm/kgdb.h> +static int kgdb_parse_options(char *options); +#endif +extern void * __rd_start, * __rd_end; +/* + * Machine setup.. + */ + +/* + * Initialize loops_per_jiffy as 10000000 (1000MIPS). + * This value will be used at the very early stage of serial setup. + * The bigger value means no problem. + */ +struct sh_cpuinfo boot_cpu_data = { CPU_SH_NONE, 0, 10000000, }; +struct screen_info screen_info; + +#if defined(CONFIG_SH_UNKNOWN) +struct sh_machine_vector sh_mv; +#endif + +/* We need this to satisfy some external references. */ +struct screen_info screen_info = { + 0, 25, /* orig-x, orig-y */ + 0, /* unused */ + 0, /* orig-video-page */ + 0, /* orig-video-mode */ + 80, /* orig-video-cols */ + 0,0,0, /* ega_ax, ega_bx, ega_cx */ + 25, /* orig-video-lines */ + 0, /* orig-video-isVGA */ + 16 /* orig-video-points */ +}; + +extern void platform_setup(void); +extern char *get_system_type(void); +extern int root_mountflags; + +#define MV_NAME_SIZE 32 + +static struct sh_machine_vector* __init get_mv_byname(const char* name); + +/* + * This is set up by the setup-routine at boot-time + */ +#define PARAM ((unsigned char *)empty_zero_page) + +#define MOUNT_ROOT_RDONLY (*(unsigned long *) (PARAM+0x000)) +#define RAMDISK_FLAGS (*(unsigned long *) (PARAM+0x004)) +#define ORIG_ROOT_DEV (*(unsigned long *) (PARAM+0x008)) +#define LOADER_TYPE (*(unsigned long *) (PARAM+0x00c)) +#define INITRD_START (*(unsigned long *) (PARAM+0x010)) +#define INITRD_SIZE (*(unsigned long *) (PARAM+0x014)) +/* ... */ +#define COMMAND_LINE ((char *) (PARAM+0x100)) + +#define RAMDISK_IMAGE_START_MASK 0x07FF +#define RAMDISK_PROMPT_FLAG 0x8000 +#define RAMDISK_LOAD_FLAG 0x4000 + +static char command_line[COMMAND_LINE_SIZE] = { 0, }; + +struct resource standard_io_resources[] = { + { "dma1", 0x00, 0x1f }, + { "pic1", 0x20, 0x3f }, + { "timer", 0x40, 0x5f }, + { "keyboard", 0x60, 0x6f }, + { "dma page reg", 0x80, 0x8f }, + { "pic2", 0xa0, 0xbf }, + { "dma2", 0xc0, 0xdf }, + { "fpu", 0xf0, 0xff } +}; + +#define STANDARD_IO_RESOURCES (sizeof(standard_io_resources)/sizeof(struct resource)) + +/* System RAM - interrupted by the 640kB-1M hole */ +#define code_resource (ram_resources[3]) +#define data_resource (ram_resources[4]) +static struct resource ram_resources[] = { + { "System RAM", 0x000000, 0x09ffff, IORESOURCE_BUSY }, + { "System RAM", 0x100000, 0x100000, IORESOURCE_BUSY }, + { "Video RAM area", 0x0a0000, 0x0bffff }, + { "Kernel code", 0x100000, 0 }, + { "Kernel data", 0, 0 } +}; + +unsigned long memory_start, memory_end; + +static inline void parse_cmdline (char ** cmdline_p, char mv_name[MV_NAME_SIZE], + struct sh_machine_vector** mvp, + unsigned long *mv_io_base, + int *mv_mmio_enable) +{ + 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'; + + memory_start = (unsigned long)PAGE_OFFSET+__MEMORY_START; + memory_end = memory_start + __MEMORY_SIZE; + + 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; + } + } + if (c == ' ' && !memcmp(from, "sh_mv=", 6)) { + char* mv_end; + char* mv_comma; + int mv_len; + if (to != command_line) + to--; + from += 6; + mv_end = strchr(from, ' '); + if (mv_end == NULL) + mv_end = from + strlen(from); + + mv_comma = strchr(from, ','); + if ((mv_comma != NULL) && (mv_comma < mv_end)) { + int ints[3]; + get_options(mv_comma+1, ARRAY_SIZE(ints), ints); + *mv_io_base = ints[1]; + *mv_mmio_enable = ints[2]; + mv_len = mv_comma - from; + } else { + mv_len = mv_end - from; + } + if (mv_len > (MV_NAME_SIZE-1)) + mv_len = MV_NAME_SIZE-1; + memcpy(mv_name, from, mv_len); + mv_name[mv_len] = '\0'; + from = mv_end; + + *mvp = get_mv_byname(mv_name); + } + c = *(from++); + if (!c) + break; + if (COMMAND_LINE_SIZE <= ++len) + break; + *(to++) = c; + } + *to = '\0'; + *cmdline_p = command_line; +} + +static int __init sh_mv_setup(char **cmdline_p) +{ +#if defined(CONFIG_SH_UNKNOWN) + extern struct sh_machine_vector mv_unknown; +#endif + struct sh_machine_vector *mv = NULL; + char mv_name[MV_NAME_SIZE] = ""; + unsigned long mv_io_base = 0; + int mv_mmio_enable = 0; + + parse_cmdline(cmdline_p, mv_name, &mv, &mv_io_base, &mv_mmio_enable); + +#ifdef CONFIG_SH_GENERIC + if (mv == NULL) { + mv = &mv_unknown; + if (*mv_name != '\0') { + printk("Warning: Unsupported machine %s, using unknown\n", + mv_name); + } + } + sh_mv = *mv; +#endif +#ifdef CONFIG_SH_UNKNOWN + sh_mv = mv_unknown; +#endif + + /* + * Manually walk the vec, fill in anything that the board hasn't yet + * by hand, wrapping to the generic implementation. + */ +#define mv_set(elem) do { \ + if (!sh_mv.mv_##elem) \ + sh_mv.mv_##elem = generic_##elem; \ +} while (0) + + mv_set(inb); mv_set(inw); mv_set(inl); + mv_set(outb); mv_set(outw); mv_set(outl); + + mv_set(inb_p); mv_set(inw_p); mv_set(inl_p); + mv_set(outb_p); mv_set(outw_p); mv_set(outl_p); + + mv_set(insb); mv_set(insw); mv_set(insl); + mv_set(outsb); mv_set(outsw); mv_set(outsl); + + mv_set(readb); mv_set(readw); mv_set(readl); + mv_set(writeb); mv_set(writew); mv_set(writel); + + mv_set(ioremap); + mv_set(iounmap); + + mv_set(isa_port2addr); + mv_set(irq_demux); + +#ifdef CONFIG_SH_UNKNOWN + __set_io_port_base(mv_io_base); +#endif + + return 0; +} + +void __init setup_arch(char **cmdline_p) +{ + unsigned long bootmap_size; + unsigned long start_pfn, max_pfn, max_low_pfn; + +#ifdef CONFIG_EARLY_PRINTK + extern void enable_early_printk(void); + + enable_early_printk(); +#endif +#ifdef CONFIG_CMDLINE_BOOL + strcpy(COMMAND_LINE, CONFIG_CMDLINE); +#endif + + 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 = virt_to_bus(_text); + code_resource.end = virt_to_bus(_etext)-1; + data_resource.start = virt_to_bus(_etext); + data_resource.end = virt_to_bus(_edata)-1; + + sh_mv_setup(cmdline_p); + +#define PFN_UP(x) (((x) + PAGE_SIZE-1) >> PAGE_SHIFT) +#define PFN_DOWN(x) ((x) >> PAGE_SHIFT) +#define PFN_PHYS(x) ((x) << PAGE_SHIFT) + +#ifdef CONFIG_DISCONTIGMEM + NODE_DATA(0)->bdata = &discontig_node_bdata[0]; + NODE_DATA(1)->bdata = &discontig_node_bdata[1]; + + bootmap_size = init_bootmem_node(NODE_DATA(1), + PFN_UP(__MEMORY_START_2ND), + PFN_UP(__MEMORY_START_2ND), + PFN_DOWN(__MEMORY_START_2ND+__MEMORY_SIZE_2ND)); + free_bootmem_node(NODE_DATA(1), __MEMORY_START_2ND, __MEMORY_SIZE_2ND); + reserve_bootmem_node(NODE_DATA(1), __MEMORY_START_2ND, bootmap_size); +#endif + + /* + * Find the highest page frame number we have available + */ + max_pfn = PFN_DOWN(__pa(memory_end)); + + /* + * Determine low and high memory ranges: + */ + max_low_pfn = max_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, + __MEMORY_START>>PAGE_SHIFT, + max_low_pfn); + /* + * Register fully available low RAM pages with the bootmem allocator. + */ + { + unsigned long curr_pfn, last_pfn, pages; + + /* + * We are rounding up the start address of usable memory: + */ + curr_pfn = PFN_UP(__MEMORY_START); + /* + * ... and at the end of the usable range downwards: + */ + last_pfn = PFN_DOWN(__pa(memory_end)); + + if (last_pfn > max_low_pfn) + last_pfn = max_low_pfn; + + pages = last_pfn - curr_pfn; + free_bootmem_node(NODE_DATA(0), PFN_PHYS(curr_pfn), + PFN_PHYS(pages)); + } + + /* + * Reserve the kernel text and + * Reserve the bootmem bitmap. We do this in two steps (first step + * was init_bootmem()), because this catches the (definitely buggy) + * case of us accidentally initializing the bootmem allocator with + * an invalid RAM area. + */ + reserve_bootmem_node(NODE_DATA(0), __MEMORY_START+PAGE_SIZE, + (PFN_PHYS(start_pfn)+bootmap_size+PAGE_SIZE-1)-__MEMORY_START); + + /* + * reserve physical page 0 - it's a special BIOS page on many boxes, + * enabling clean reboots, SMP operation, laptop functions. + */ + reserve_bootmem_node(NODE_DATA(0), __MEMORY_START, PAGE_SIZE); + +#ifdef CONFIG_BLK_DEV_INITRD + ROOT_DEV = MKDEV(RAMDISK_MAJOR, 0); + if (&__rd_start != &__rd_end) { + LOADER_TYPE = 1; + INITRD_START = PHYSADDR((unsigned long)&__rd_start) - __MEMORY_START; + INITRD_SIZE = (unsigned long)&__rd_end - (unsigned long)&__rd_start; + } + + if (LOADER_TYPE && INITRD_START) { + if (INITRD_START + INITRD_SIZE <= (max_low_pfn << PAGE_SHIFT)) { + reserve_bootmem_node(NODE_DATA(0), INITRD_START+__MEMORY_START, INITRD_SIZE); + initrd_start = + 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", + INITRD_START + INITRD_SIZE, + max_low_pfn << PAGE_SHIFT); + initrd_start = 0; + } + } +#endif + +#ifdef CONFIG_DUMMY_CONSOLE + conswitchp = &dummy_con; +#endif + + /* Perform the machine specific initialisation */ + platform_setup(); + + paging_init(); +} + +struct sh_machine_vector* __init get_mv_byname(const char* name) +{ + extern int strcasecmp(const char *, const char *); + extern long __machvec_start, __machvec_end; + struct sh_machine_vector *all_vecs = + (struct sh_machine_vector *)&__machvec_start; + + int i, n = ((unsigned long)&__machvec_end + - (unsigned long)&__machvec_start)/ + sizeof(struct sh_machine_vector); + + for (i = 0; i < n; ++i) { + struct sh_machine_vector *mv = &all_vecs[i]; + if (mv == NULL) + continue; + if (strcasecmp(name, get_system_type()) == 0) { + return mv; + } + } + return NULL; +} + +static struct cpu cpu[NR_CPUS]; + +static int __init topology_init(void) +{ + int cpu_id; + + for (cpu_id = 0; cpu_id < NR_CPUS; cpu_id++) + if (cpu_possible(cpu_id)) + register_cpu(&cpu[cpu_id], cpu_id, NULL); + + return 0; +} + +subsys_initcall(topology_init); + +static const char *cpu_name[] = { + [CPU_SH7604] = "SH7604", + [CPU_SH7705] = "SH7705", + [CPU_SH7708] = "SH7708", + [CPU_SH7729] = "SH7729", + [CPU_SH7300] = "SH7300", + [CPU_SH7750] = "SH7750", + [CPU_SH7750S] = "SH7750S", + [CPU_SH7750R] = "SH7750R", + [CPU_SH7751] = "SH7751", + [CPU_SH7751R] = "SH7751R", + [CPU_SH7760] = "SH7760", + [CPU_SH73180] = "SH73180", + [CPU_ST40RA] = "ST40RA", + [CPU_ST40GX1] = "ST40GX1", + [CPU_SH4_202] = "SH4-202", + [CPU_SH4_501] = "SH4-501", + [CPU_SH_NONE] = "Unknown" +}; + +const char *get_cpu_subtype(void) +{ + return cpu_name[boot_cpu_data.type]; +} + +#ifdef CONFIG_PROC_FS +static const char *cpu_flags[] = { + "none", "fpu", "p2flush", "mmuassoc", "dsp", "perfctr", +}; + +static void show_cpuflags(struct seq_file *m) +{ + unsigned long i; + + seq_printf(m, "cpu flags\t:"); + + if (!cpu_data->flags) { + seq_printf(m, " %s\n", cpu_flags[0]); + return; + } + + for (i = 0; i < cpu_data->flags; i++) + if ((cpu_data->flags & (1 << i))) + seq_printf(m, " %s", cpu_flags[i+1]); + + seq_printf(m, "\n"); +} + +static void show_cacheinfo(struct seq_file *m, const char *type, struct cache_info info) +{ + unsigned int cache_size; + + cache_size = info.ways * info.sets * info.linesz; + + seq_printf(m, "%s size\t: %dKiB\n", type, cache_size >> 10); +} + +/* + * Get CPU information for use by the procfs. + */ +static int show_cpuinfo(struct seq_file *m, void *v) +{ + unsigned int cpu = smp_processor_id(); + + if (!cpu && cpu_online(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: %s\n", system_utsname.machine); + seq_printf(m, "cpu type\t: %s\n", get_cpu_subtype()); + + show_cpuflags(m); + + seq_printf(m, "cache type\t: "); + + /* + * Check for what type of cache we have, we support both the + * unified cache on the SH-2 and SH-3, as well as the harvard + * style cache on the SH-4. + */ + if (test_bit(SH_CACHE_COMBINED, &(boot_cpu_data.icache.flags))) { + seq_printf(m, "unified\n"); + show_cacheinfo(m, "cache", boot_cpu_data.icache); + } else { + seq_printf(m, "split (harvard)\n"); + show_cacheinfo(m, "icache", boot_cpu_data.icache); + show_cacheinfo(m, "dcache", boot_cpu_data.dcache); + } + + seq_printf(m, "bogomips\t: %lu.%02lu\n", + boot_cpu_data.loops_per_jiffy/(500000/HZ), + (boot_cpu_data.loops_per_jiffy/(5000/HZ)) % 100); + +#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); +#ifdef CONFIG_CPU_SUBTYPE_ST40STB1 + PRINT_CLOCK("memory", boot_cpu_data.memory_clock); +#endif + PRINT_CLOCK("module", boot_cpu_data.module_clock); + + return 0; +} + + +static void *c_start(struct seq_file *m, loff_t *pos) +{ + return *pos < NR_CPUS ? cpu_data + *pos : NULL; +} +static void *c_next(struct seq_file *m, void *v, loff_t *pos) +{ + ++*pos; + return c_start(m, pos); +} +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 */ + +#ifdef CONFIG_SH_KGDB +/* + * Parse command-line kgdb options. By default KGDB is enabled, + * entered on error (or other action) using default serial info. + * The command-line option can include a serial port specification + * and an action to override default or configured behavior. + */ +struct kgdb_sermap kgdb_sci_sermap = +{ "ttySC", 5, kgdb_sci_setup, NULL }; + +struct kgdb_sermap *kgdb_serlist = &kgdb_sci_sermap; +struct kgdb_sermap *kgdb_porttype = &kgdb_sci_sermap; + +void kgdb_register_sermap(struct kgdb_sermap *map) +{ + struct kgdb_sermap *last; + + for (last = kgdb_serlist; last->next; last = last->next) + ; + last->next = map; + if (!map->namelen) { + map->namelen = strlen(map->name); + } +} + +static int __init kgdb_parse_options(char *options) +{ + char c; + int baud; + + /* Check for port spec (or use default) */ + + /* Determine port type and instance */ + if (!memcmp(options, "tty", 3)) { + struct kgdb_sermap *map = kgdb_serlist; + + while (map && memcmp(options, map->name, map->namelen)) + map = map->next; + + if (!map) { + KGDB_PRINTK("unknown port spec in %s\n", options); + return -1; + } + + kgdb_porttype = map; + kgdb_serial_setup = map->setup_fn; + kgdb_portnum = options[map->namelen] - '0'; + options += map->namelen + 1; + + options = (*options == ',') ? options+1 : options; + + /* Read optional parameters (baud/parity/bits) */ + baud = simple_strtoul(options, &options, 10); + if (baud != 0) { + kgdb_baud = baud; + + c = toupper(*options); + if (c == 'E' || c == 'O' || c == 'N') { + kgdb_parity = c; + options++; + } + + c = *options; + if (c == '7' || c == '8') { + kgdb_bits = c; + options++; + } + options = (*options == ',') ? options+1 : options; + } + } + + /* Check for action specification */ + if (!memcmp(options, "halt", 4)) { + kgdb_halt = 1; + options += 4; + } else if (!memcmp(options, "disabled", 8)) { + kgdb_enabled = 0; + options += 8; + } + + if (*options) { + KGDB_PRINTK("ignored unknown options: %s\n", options); + return 0; + } + return 1; +} +__setup("kgdb=", kgdb_parse_options); +#endif /* CONFIG_SH_KGDB */ + |
