diff options
Diffstat (limited to 'arch/metag/kernel/setup.c')
| -rw-r--r-- | arch/metag/kernel/setup.c | 622 |
1 files changed, 0 insertions, 622 deletions
diff --git a/arch/metag/kernel/setup.c b/arch/metag/kernel/setup.c deleted file mode 100644 index 1166f1fbfd63..000000000000 --- a/arch/metag/kernel/setup.c +++ /dev/null @@ -1,622 +0,0 @@ -/* - * Copyright (C) 2005-2012 Imagination Technologies Ltd. - * - * This file contains the architecture-dependant parts of system setup. - * - */ - -#include <linux/export.h> -#include <linux/bootmem.h> -#include <linux/console.h> -#include <linux/cpu.h> -#include <linux/delay.h> -#include <linux/errno.h> -#include <linux/fs.h> -#include <linux/genhd.h> -#include <linux/init.h> -#include <linux/initrd.h> -#include <linux/interrupt.h> -#include <linux/kernel.h> -#include <linux/memblock.h> -#include <linux/mm.h> -#include <linux/of_fdt.h> -#include <linux/pfn.h> -#include <linux/root_dev.h> -#include <linux/sched.h> -#include <linux/seq_file.h> -#include <linux/start_kernel.h> -#include <linux/string.h> - -#include <asm/cachepart.h> -#include <asm/clock.h> -#include <asm/core_reg.h> -#include <asm/cpu.h> -#include <asm/da.h> -#include <asm/highmem.h> -#include <asm/hwthread.h> -#include <asm/l2cache.h> -#include <asm/mach/arch.h> -#include <asm/metag_mem.h> -#include <asm/metag_regs.h> -#include <asm/mmu.h> -#include <asm/mmzone.h> -#include <asm/processor.h> -#include <asm/sections.h> -#include <asm/setup.h> -#include <asm/traps.h> - -/* Priv protect as many registers as possible. */ -#define DEFAULT_PRIV (TXPRIVEXT_COPRO_BITS | \ - TXPRIVEXT_TXTRIGGER_BIT | \ - TXPRIVEXT_TXGBLCREG_BIT | \ - TXPRIVEXT_ILOCK_BIT | \ - TXPRIVEXT_TXITACCYC_BIT | \ - TXPRIVEXT_TXDIVTIME_BIT | \ - TXPRIVEXT_TXAMAREGX_BIT | \ - TXPRIVEXT_TXTIMERI_BIT | \ - TXPRIVEXT_TXSTATUS_BIT | \ - TXPRIVEXT_TXDISABLE_BIT) - -/* Meta2 specific bits. */ -#ifdef CONFIG_METAG_META12 -#define META2_PRIV 0 -#else -#define META2_PRIV (TXPRIVEXT_TXTIMER_BIT | \ - TXPRIVEXT_TRACE_BIT) -#endif - -/* Unaligned access checking bits. */ -#ifdef CONFIG_METAG_UNALIGNED -#define UNALIGNED_PRIV TXPRIVEXT_ALIGNREW_BIT -#else -#define UNALIGNED_PRIV 0 -#endif - -#define PRIV_BITS (DEFAULT_PRIV | \ - META2_PRIV | \ - UNALIGNED_PRIV) - -/* - * Protect access to: - * 0x06000000-0x07ffffff Direct mapped region - * 0x05000000-0x05ffffff MMU table region (Meta1) - * 0x04400000-0x047fffff Cache flush region - * 0x84000000-0x87ffffff Core cache memory region (Meta2) - * - * Allow access to: - * 0x80000000-0x81ffffff Core code memory region (Meta2) - */ -#ifdef CONFIG_METAG_META12 -#define PRIVSYSR_BITS TXPRIVSYSR_ALL_BITS -#else -#define PRIVSYSR_BITS (TXPRIVSYSR_ALL_BITS & ~TXPRIVSYSR_CORECODE_BIT) -#endif - -/* Protect all 0x02xxxxxx and 0x048xxxxx. */ -#define PIOREG_BITS 0xffffffff - -/* - * Protect all 0x04000xx0 (system events) - * except write combiner flush and write fence (system events 4 and 5). - */ -#define PSYREG_BITS 0xfffffffb - - -extern char _heap_start[]; - -#ifdef CONFIG_DA_CONSOLE -/* Our early channel based console driver */ -extern struct console dash_console; -#endif - -const struct machine_desc *machine_desc __initdata; - -/* - * Map a Linux CPU number to a hardware thread ID - * In SMP this will be setup with the correct mapping at startup; in UP this - * will map to the HW thread on which we are running. - */ -u8 cpu_2_hwthread_id[NR_CPUS] __read_mostly = { - [0 ... NR_CPUS-1] = BAD_HWTHREAD_ID -}; -EXPORT_SYMBOL_GPL(cpu_2_hwthread_id); - -/* - * Map a hardware thread ID to a Linux CPU number - * In SMP this will be fleshed out with the correct CPU ID for a particular - * hardware thread. In UP this will be initialised with the boot CPU ID. - */ -u8 hwthread_id_2_cpu[4] __read_mostly = { - [0 ... 3] = BAD_CPU_ID -}; - -/* The relative offset of the MMU mapped memory (from ldlk or bootloader) - * to the real physical memory. This is needed as we have to use the - * physical addresses in the MMU tables (pte entries), and not the virtual - * addresses. - * This variable is used in the __pa() and __va() macros, and should - * probably only be used via them. - */ -unsigned int meta_memoffset; -EXPORT_SYMBOL(meta_memoffset); - -static char __initdata *original_cmd_line; - -DEFINE_PER_CPU(PTBI, pTBI); - -/* - * Mapping are specified as "CPU_ID:HWTHREAD_ID", e.g. - * - * "hwthread_map=0:1,1:2,2:3,3:0" - * - * Linux CPU ID HWTHREAD_ID - * --------------------------- - * 0 1 - * 1 2 - * 2 3 - * 3 0 - */ -static int __init parse_hwthread_map(char *p) -{ - int cpu; - - while (*p) { - cpu = (*p++) - '0'; - if (cpu < 0 || cpu > 9) - goto err_cpu; - - p++; /* skip semi-colon */ - cpu_2_hwthread_id[cpu] = (*p++) - '0'; - if (cpu_2_hwthread_id[cpu] >= 4) - goto err_thread; - hwthread_id_2_cpu[cpu_2_hwthread_id[cpu]] = cpu; - - if (*p == ',') - p++; /* skip comma */ - } - - return 0; -err_cpu: - pr_err("%s: hwthread_map cpu argument out of range\n", __func__); - return -EINVAL; -err_thread: - pr_err("%s: hwthread_map thread argument out of range\n", __func__); - return -EINVAL; -} -early_param("hwthread_map", parse_hwthread_map); - -void __init dump_machine_table(void) -{ - struct machine_desc *p; - const char **compat; - - pr_info("Available machine support:\n\tNAME\t\tCOMPATIBLE LIST\n"); - for_each_machine_desc(p) { - pr_info("\t%s\t[", p->name); - for (compat = p->dt_compat; compat && *compat; ++compat) - printk(" '%s'", *compat); - printk(" ]\n"); - } - - pr_info("\nPlease check your kernel config and/or bootloader.\n"); - - hard_processor_halt(HALT_PANIC); -} - -#ifdef CONFIG_METAG_HALT_ON_PANIC -static int metag_panic_event(struct notifier_block *this, unsigned long event, - void *ptr) -{ - hard_processor_halt(HALT_PANIC); - return NOTIFY_DONE; -} - -static struct notifier_block metag_panic_block = { - metag_panic_event, - NULL, - 0 -}; -#endif - -void __init setup_arch(char **cmdline_p) -{ - unsigned long start_pfn; - unsigned long text_start = (unsigned long)(&_stext); - unsigned long cpu = smp_processor_id(); - unsigned long heap_start, heap_end; - unsigned long start_pte; - PTBI _pTBI; - PTBISEG p_heap; - int heap_id, i; - - metag_cache_probe(); - - metag_da_probe(); -#ifdef CONFIG_DA_CONSOLE - if (metag_da_enabled()) { - /* An early channel based console driver */ - register_console(&dash_console); - add_preferred_console("ttyDA", 1, NULL); - } -#endif - - /* try interpreting the argument as a device tree */ - machine_desc = setup_machine_fdt(original_cmd_line); - /* if it doesn't look like a device tree it must be a command line */ - if (!machine_desc) { -#ifdef CONFIG_METAG_BUILTIN_DTB - /* try the embedded device tree */ - machine_desc = setup_machine_fdt(__dtb_start); - if (!machine_desc) - panic("Invalid embedded device tree."); -#else - /* use the default machine description */ - machine_desc = default_machine_desc(); -#endif -#ifndef CONFIG_CMDLINE_FORCE - /* append the bootloader cmdline to any builtin fdt cmdline */ - if (boot_command_line[0] && original_cmd_line[0]) - strlcat(boot_command_line, " ", COMMAND_LINE_SIZE); - strlcat(boot_command_line, original_cmd_line, - COMMAND_LINE_SIZE); -#endif - } - setup_meta_clocks(machine_desc->clocks); - - *cmdline_p = boot_command_line; - parse_early_param(); - - /* - * Make sure we don't alias in dcache or icache - */ - check_for_cache_aliasing(cpu); - - -#ifdef CONFIG_METAG_HALT_ON_PANIC - atomic_notifier_chain_register(&panic_notifier_list, - &metag_panic_block); -#endif - -#ifdef CONFIG_DUMMY_CONSOLE - conswitchp = &dummy_con; -#endif - - if (!(__core_reg_get(TXSTATUS) & TXSTATUS_PSTAT_BIT)) - panic("Privilege must be enabled for this thread."); - - _pTBI = __TBI(TBID_ISTAT_BIT); - - per_cpu(pTBI, cpu) = _pTBI; - - if (!per_cpu(pTBI, cpu)) - panic("No TBI found!"); - - /* - * Initialize all interrupt vectors to our copy of __TBIUnExpXXX, - * rather than the version from the bootloader. This makes call - * stacks easier to understand and may allow us to unmap the - * bootloader at some point. - */ - for (i = 0; i <= TBID_SIGNUM_MAX; i++) - _pTBI->fnSigs[i] = __TBIUnExpXXX; - - /* A Meta requirement is that the kernel is loaded (virtually) - * at the PAGE_OFFSET. - */ - if (PAGE_OFFSET != text_start) - panic("Kernel not loaded at PAGE_OFFSET (%#x) but at %#lx.", - PAGE_OFFSET, text_start); - - start_pte = mmu_read_second_level_page(text_start); - - /* - * Kernel pages should have the PRIV bit set by the bootloader. - */ - if (!(start_pte & _PAGE_KERNEL)) - panic("kernel pte does not have PRIV set"); - - /* - * See __pa and __va in include/asm/page.h. - * This value is negative when running in local space but the - * calculations work anyway. - */ - meta_memoffset = text_start - (start_pte & PAGE_MASK); - - /* Now lets look at the heap space */ - heap_id = (__TBIThreadId() & TBID_THREAD_BITS) - + TBID_SEG(0, TBID_SEGSCOPE_LOCAL, TBID_SEGTYPE_HEAP); - - p_heap = __TBIFindSeg(NULL, heap_id); - - if (!p_heap) - panic("Could not find heap from TBI!"); - - /* The heap begins at the first full page after the kernel data. */ - heap_start = (unsigned long) &_heap_start; - - /* The heap ends at the end of the heap segment specified with - * ldlk. - */ - if (is_global_space(text_start)) { - pr_debug("WARNING: running in global space!\n"); - heap_end = (unsigned long)p_heap->pGAddr + p_heap->Bytes; - } else { - heap_end = (unsigned long)p_heap->pLAddr + p_heap->Bytes; - } - - ROOT_DEV = Root_RAM0; - - /* init_mm is the mm struct used for the first task. It is then - * cloned for all other tasks spawned from that task. - * - * Note - we are using the virtual addresses here. - */ - init_mm.start_code = (unsigned long)(&_stext); - init_mm.end_code = (unsigned long)(&_etext); - init_mm.end_data = (unsigned long)(&_edata); - init_mm.brk = (unsigned long)heap_start; - - min_low_pfn = PFN_UP(__pa(text_start)); - max_low_pfn = PFN_DOWN(__pa(heap_end)); - - pfn_base = min_low_pfn; - - /* Round max_pfn up to a 4Mb boundary. The free_bootmem_node() - * call later makes sure to keep the rounded up pages marked reserved. - */ - max_pfn = max_low_pfn + ((1 << MAX_ORDER) - 1); - max_pfn &= ~((1 << MAX_ORDER) - 1); - - start_pfn = PFN_UP(__pa(heap_start)); - - if (min_low_pfn & ((1 << MAX_ORDER) - 1)) { - /* Theoretically, we could expand the space that the - * bootmem allocator covers - much as we do for the - * 'high' address, and then tell the bootmem system - * that the lowest chunk is 'not available'. Right - * now it is just much easier to constrain the - * user to always MAX_ORDER align their kernel space. - */ - - panic("Kernel must be %d byte aligned, currently at %#lx.", - 1 << (MAX_ORDER + PAGE_SHIFT), - min_low_pfn << PAGE_SHIFT); - } - -#ifdef CONFIG_HIGHMEM - highstart_pfn = highend_pfn = max_pfn; - high_memory = (void *) __va(PFN_PHYS(highstart_pfn)); -#else - high_memory = (void *)__va(PFN_PHYS(max_pfn)); -#endif - - paging_init(heap_end); - - setup_priv(); - - /* Setup the boot cpu's mapping. The rest will be setup below. */ - cpu_2_hwthread_id[smp_processor_id()] = hard_processor_id(); - hwthread_id_2_cpu[hard_processor_id()] = smp_processor_id(); - - unflatten_and_copy_device_tree(); - -#ifdef CONFIG_SMP - smp_init_cpus(); -#endif - - if (machine_desc->init_early) - machine_desc->init_early(); -} - -static int __init customize_machine(void) -{ - /* customizes platform devices, or adds new ones */ - if (machine_desc->init_machine) - machine_desc->init_machine(); - - return 0; -} -arch_initcall(customize_machine); - -static int __init init_machine_late(void) -{ - if (machine_desc->init_late) - machine_desc->init_late(); - return 0; -} -late_initcall(init_machine_late); - -#ifdef CONFIG_PROC_FS -/* - * Get CPU information for use by the procfs. - */ -static const char *get_cpu_capabilities(unsigned int txenable) -{ -#ifdef CONFIG_METAG_META21 - /* See CORE_ID in META HTP.GP TRM - Architecture Overview 2.1.238 */ - int coreid = metag_in32(METAC_CORE_ID); - unsigned int dsp_type = (coreid >> 3) & 7; - unsigned int fpu_type = (coreid >> 7) & 3; - - switch (dsp_type | fpu_type << 3) { - case (0x00): return "EDSP"; - case (0x01): return "DSP"; - case (0x08): return "EDSP+LFPU"; - case (0x09): return "DSP+LFPU"; - case (0x10): return "EDSP+FPU"; - case (0x11): return "DSP+FPU"; - } - return "UNKNOWN"; - -#else - if (!(txenable & TXENABLE_CLASS_BITS)) - return "DSP"; - else - return ""; -#endif -} - -static int show_cpuinfo(struct seq_file *m, void *v) -{ - const char *cpu; - unsigned int txenable, thread_id, major, minor; - unsigned long clockfreq = get_coreclock(); -#ifdef CONFIG_SMP - int i; - unsigned long lpj; -#endif - - cpu = "META"; - - txenable = __core_reg_get(TXENABLE); - major = (txenable & TXENABLE_MAJOR_REV_BITS) >> TXENABLE_MAJOR_REV_S; - minor = (txenable & TXENABLE_MINOR_REV_BITS) >> TXENABLE_MINOR_REV_S; - thread_id = (txenable >> 8) & 0x3; - -#ifdef CONFIG_SMP - for_each_online_cpu(i) { - lpj = per_cpu(cpu_data, i).loops_per_jiffy; - txenable = core_reg_read(TXUCT_ID, TXENABLE_REGNUM, - cpu_2_hwthread_id[i]); - - seq_printf(m, "CPU:\t\t%s %d.%d (thread %d)\n" - "Clocking:\t%lu.%1luMHz\n" - "BogoMips:\t%lu.%02lu\n" - "Calibration:\t%lu loops\n" - "Capabilities:\t%s\n\n", - cpu, major, minor, i, - clockfreq / 1000000, (clockfreq / 100000) % 10, - lpj / (500000 / HZ), (lpj / (5000 / HZ)) % 100, - lpj, - get_cpu_capabilities(txenable)); - } -#else - seq_printf(m, "CPU:\t\t%s %d.%d (thread %d)\n" - "Clocking:\t%lu.%1luMHz\n" - "BogoMips:\t%lu.%02lu\n" - "Calibration:\t%lu loops\n" - "Capabilities:\t%s\n", - cpu, major, minor, thread_id, - clockfreq / 1000000, (clockfreq / 100000) % 10, - loops_per_jiffy / (500000 / HZ), - (loops_per_jiffy / (5000 / HZ)) % 100, - loops_per_jiffy, - get_cpu_capabilities(txenable)); -#endif /* CONFIG_SMP */ - -#ifdef CONFIG_METAG_L2C - if (meta_l2c_is_present()) { - seq_printf(m, "L2 cache:\t%s\n" - "L2 cache size:\t%d KB\n", - meta_l2c_is_enabled() ? "enabled" : "disabled", - meta_l2c_size() >> 10); - } -#endif - 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) -{ -} -const struct seq_operations cpuinfo_op = { - .start = c_start, - .next = c_next, - .stop = c_stop, - .show = show_cpuinfo, -}; -#endif /* CONFIG_PROC_FS */ - -void __init metag_start_kernel(char *args) -{ - /* Zero the timer register so timestamps are from the point at - * which the kernel started running. - */ - __core_reg_set(TXTIMER, 0); - - /* Clear the bss. */ - memset(__bss_start, 0, - (unsigned long)__bss_stop - (unsigned long)__bss_start); - - /* Remember where these are for use in setup_arch */ - original_cmd_line = args; - - current_thread_info()->cpu = hard_processor_id(); - - start_kernel(); -} - -/** - * setup_priv() - Set up privilege protection registers. - * - * Set up privilege protection registers such as TXPRIVEXT to prevent userland - * from touching our precious registers and sensitive memory areas. - */ -void setup_priv(void) -{ - unsigned int offset = hard_processor_id() << TXPRIVREG_STRIDE_S; - - __core_reg_set(TXPRIVEXT, PRIV_BITS); - - metag_out32(PRIVSYSR_BITS, T0PRIVSYSR + offset); - metag_out32(PIOREG_BITS, T0PIOREG + offset); - metag_out32(PSYREG_BITS, T0PSYREG + offset); -} - -PTBI pTBI_get(unsigned int cpu) -{ - return per_cpu(pTBI, cpu); -} -EXPORT_SYMBOL(pTBI_get); - -#if defined(CONFIG_METAG_DSP) && defined(CONFIG_METAG_FPU) -static char capabilities[] = "dsp fpu"; -#elif defined(CONFIG_METAG_DSP) -static char capabilities[] = "dsp"; -#elif defined(CONFIG_METAG_FPU) -static char capabilities[] = "fpu"; -#else -static char capabilities[] = ""; -#endif - -static struct ctl_table caps_kern_table[] = { - { - .procname = "capabilities", - .data = capabilities, - .maxlen = sizeof(capabilities), - .mode = 0444, - .proc_handler = proc_dostring, - }, - {} -}; - -static struct ctl_table caps_root_table[] = { - { - .procname = "kernel", - .mode = 0555, - .child = caps_kern_table, - }, - {} -}; - -static int __init capabilities_register_sysctl(void) -{ - struct ctl_table_header *caps_table_header; - - caps_table_header = register_sysctl_table(caps_root_table); - if (!caps_table_header) { - pr_err("Unable to register CAPABILITIES sysctl\n"); - return -ENOMEM; - } - - return 0; -} - -core_initcall(capabilities_register_sysctl); |