diff options
Diffstat (limited to 'arch/sh/kernel/setup.c')
| -rw-r--r-- | arch/sh/kernel/setup.c | 411 |
1 files changed, 411 insertions, 0 deletions
diff --git a/arch/sh/kernel/setup.c b/arch/sh/kernel/setup.c new file mode 100644 index 0000000000..b3da2757fa --- /dev/null +++ b/arch/sh/kernel/setup.c @@ -0,0 +1,411 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * arch/sh/kernel/setup.c + * + * This file handles the architecture-dependent parts of initialization + * + * Copyright (C) 1999 Niibe Yutaka + * Copyright (C) 2002 - 2010 Paul Mundt + */ +#include <linux/screen_info.h> +#include <linux/ioport.h> +#include <linux/init.h> +#include <linux/initrd.h> +#include <linux/console.h> +#include <linux/root_dev.h> +#include <linux/utsname.h> +#include <linux/nodemask.h> +#include <linux/cpu.h> +#include <linux/pfn.h> +#include <linux/fs.h> +#include <linux/mm.h> +#include <linux/kexec.h> +#include <linux/module.h> +#include <linux/smp.h> +#include <linux/err.h> +#include <linux/crash_dump.h> +#include <linux/mmzone.h> +#include <linux/clk.h> +#include <linux/delay.h> +#include <linux/platform_device.h> +#include <linux/memblock.h> +#include <linux/of.h> +#include <linux/of_fdt.h> +#include <linux/uaccess.h> +#include <uapi/linux/mount.h> +#include <asm/io.h> +#include <asm/page.h> +#include <asm/elf.h> +#include <asm/sections.h> +#include <asm/irq.h> +#include <asm/setup.h> +#include <asm/clock.h> +#include <asm/smp.h> +#include <asm/mmu_context.h> +#include <asm/mmzone.h> +#include <asm/processor.h> +#include <asm/sparsemem.h> +#include <asm/platform_early.h> + +/* + * 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 cpu_data[NR_CPUS] __read_mostly = { + [0] = { + .type = CPU_SH_NONE, + .family = CPU_FAMILY_UNKNOWN, + .loops_per_jiffy = 10000000, + .phys_bits = MAX_PHYSMEM_BITS, + }, +}; +EXPORT_SYMBOL(cpu_data); + +/* + * The machine vector. First entry in .machvec.init, or clobbered by + * sh_mv= on the command line, prior to .machvec.init teardown. + */ +struct sh_machine_vector sh_mv = { .mv_name = "generic", }; +EXPORT_SYMBOL(sh_mv); + +#ifdef CONFIG_VT +struct screen_info screen_info; +#endif + +extern int root_mountflags; + +#define RAMDISK_IMAGE_START_MASK 0x07FF +#define RAMDISK_PROMPT_FLAG 0x8000 +#define RAMDISK_LOAD_FLAG 0x4000 + +static char __initdata command_line[COMMAND_LINE_SIZE] = { 0, }; + +static struct resource code_resource = { + .name = "Kernel code", + .flags = IORESOURCE_BUSY | IORESOURCE_SYSTEM_RAM, +}; + +static struct resource data_resource = { + .name = "Kernel data", + .flags = IORESOURCE_BUSY | IORESOURCE_SYSTEM_RAM, +}; + +static struct resource bss_resource = { + .name = "Kernel bss", + .flags = IORESOURCE_BUSY | IORESOURCE_SYSTEM_RAM, +}; + +unsigned long memory_start; +EXPORT_SYMBOL(memory_start); +unsigned long memory_end = 0; +EXPORT_SYMBOL(memory_end); +unsigned long memory_limit = 0; + +static struct resource mem_resources[MAX_NUMNODES]; + +int l1i_cache_shape, l1d_cache_shape, l2_cache_shape; + +static int __init early_parse_mem(char *p) +{ + if (!p) + return 1; + + memory_limit = PAGE_ALIGN(memparse(p, &p)); + + pr_notice("Memory limited to %ldMB\n", memory_limit >> 20); + + return 0; +} +early_param("mem", early_parse_mem); + +void __init check_for_initrd(void) +{ +#ifdef CONFIG_BLK_DEV_INITRD + unsigned long start, end; + + /* + * Check for the rare cases where boot loaders adhere to the boot + * ABI. + */ + if (!LOADER_TYPE || !INITRD_START || !INITRD_SIZE) + goto disable; + + start = INITRD_START + __MEMORY_START; + end = start + INITRD_SIZE; + + if (unlikely(end <= start)) + goto disable; + if (unlikely(start & ~PAGE_MASK)) { + pr_err("initrd must be page aligned\n"); + goto disable; + } + + if (unlikely(start < __MEMORY_START)) { + pr_err("initrd start (%08lx) < __MEMORY_START(%x)\n", + start, __MEMORY_START); + goto disable; + } + + if (unlikely(end > memblock_end_of_DRAM())) { + pr_err("initrd extends beyond end of memory " + "(0x%08lx > 0x%08lx)\ndisabling initrd\n", + end, (unsigned long)memblock_end_of_DRAM()); + goto disable; + } + + /* + * If we got this far in spite of the boot loader's best efforts + * to the contrary, assume we actually have a valid initrd and + * fix up the root dev. + */ + ROOT_DEV = Root_RAM0; + + /* + * Address sanitization + */ + initrd_start = (unsigned long)__va(start); + initrd_end = initrd_start + INITRD_SIZE; + + memblock_reserve(__pa(initrd_start), INITRD_SIZE); + + return; + +disable: + pr_info("initrd disabled\n"); + initrd_start = initrd_end = 0; +#endif +} + +#ifndef CONFIG_GENERIC_CALIBRATE_DELAY +void calibrate_delay(void) +{ + struct clk *clk = clk_get(NULL, "cpu_clk"); + + if (IS_ERR(clk)) + panic("Need a sane CPU clock definition!"); + + loops_per_jiffy = (clk_get_rate(clk) >> 1) / HZ; + + printk(KERN_INFO "Calibrating delay loop (skipped)... " + "%lu.%02lu BogoMIPS PRESET (lpj=%lu)\n", + loops_per_jiffy/(500000/HZ), + (loops_per_jiffy/(5000/HZ)) % 100, + loops_per_jiffy); +} +#endif + +void __init __add_active_range(unsigned int nid, unsigned long start_pfn, + unsigned long end_pfn) +{ + struct resource *res = &mem_resources[nid]; + unsigned long start, end; + + WARN_ON(res->name); /* max one active range per node for now */ + + start = start_pfn << PAGE_SHIFT; + end = end_pfn << PAGE_SHIFT; + + res->name = "System RAM"; + res->start = start; + res->end = end - 1; + res->flags = IORESOURCE_SYSTEM_RAM | IORESOURCE_BUSY; + + if (request_resource(&iomem_resource, res)) { + pr_err("unable to request memory_resource 0x%lx 0x%lx\n", + start_pfn, end_pfn); + return; + } + + /* + * We don't know which RAM region contains kernel data or + * the reserved crashkernel region, so try it repeatedly + * and let the resource manager test it. + */ + request_resource(res, &code_resource); + request_resource(res, &data_resource); + request_resource(res, &bss_resource); +#ifdef CONFIG_KEXEC + request_resource(res, &crashk_res); +#endif + + /* + * Also make sure that there is a PMB mapping that covers this + * range before we attempt to activate it, to avoid reset by MMU. + * We can hit this path with NUMA or memory hot-add. + */ + pmb_bolt_mapping((unsigned long)__va(start), start, end - start, + PAGE_KERNEL); + + memblock_set_node(PFN_PHYS(start_pfn), PFN_PHYS(end_pfn - start_pfn), + &memblock.memory, nid); +} + +void __init __weak plat_early_device_setup(void) +{ +} + +#ifdef CONFIG_OF_EARLY_FLATTREE +void __ref sh_fdt_init(phys_addr_t dt_phys) +{ + static int done = 0; + void *dt_virt; + + /* Avoid calling an __init function on secondary cpus. */ + if (done) return; + +#ifdef CONFIG_USE_BUILTIN_DTB + dt_virt = __dtb_start; +#else + dt_virt = phys_to_virt(dt_phys); +#endif + + if (!dt_virt || !early_init_dt_scan(dt_virt)) { + pr_crit("Error: invalid device tree blob" + " at physical address %p\n", (void *)dt_phys); + + while (true) + cpu_relax(); + } + + done = 1; +} +#endif + +void __init setup_arch(char **cmdline_p) +{ + enable_mmu(); + + ROOT_DEV = old_decode_dev(ORIG_ROOT_DEV); + + printk(KERN_NOTICE "Boot params:\n" + "... MOUNT_ROOT_RDONLY - %08lx\n" + "... RAMDISK_FLAGS - %08lx\n" + "... ORIG_ROOT_DEV - %08lx\n" + "... LOADER_TYPE - %08lx\n" + "... INITRD_START - %08lx\n" + "... INITRD_SIZE - %08lx\n", + MOUNT_ROOT_RDONLY, RAMDISK_FLAGS, + ORIG_ROOT_DEV, LOADER_TYPE, + INITRD_START, INITRD_SIZE); + +#ifdef CONFIG_BLK_DEV_RAM + rd_image_start = RAMDISK_FLAGS & RAMDISK_IMAGE_START_MASK; +#endif + + if (!MOUNT_ROOT_RDONLY) + root_mountflags &= ~MS_RDONLY; + setup_initial_init_mm(_text, _etext, _edata, _end); + + code_resource.start = virt_to_phys(_text); + code_resource.end = virt_to_phys(_etext)-1; + data_resource.start = virt_to_phys(_etext); + data_resource.end = virt_to_phys(_edata)-1; + bss_resource.start = virt_to_phys(__bss_start); + bss_resource.end = virt_to_phys(__bss_stop)-1; + +#ifdef CONFIG_CMDLINE_OVERWRITE + strscpy(command_line, CONFIG_CMDLINE, sizeof(command_line)); +#else + strscpy(command_line, COMMAND_LINE, sizeof(command_line)); +#ifdef CONFIG_CMDLINE_EXTEND + strlcat(command_line, " ", sizeof(command_line)); + strlcat(command_line, CONFIG_CMDLINE, sizeof(command_line)); +#endif +#endif + + /* Save unparsed command line copy for /proc/cmdline */ + memcpy(boot_command_line, command_line, COMMAND_LINE_SIZE); + *cmdline_p = command_line; + + parse_early_param(); + + plat_early_device_setup(); + + sh_mv_setup(); + + /* Let earlyprintk output early console messages */ + sh_early_platform_driver_probe("earlyprintk", 1, 1); + +#ifdef CONFIG_OF_EARLY_FLATTREE +#ifdef CONFIG_USE_BUILTIN_DTB + unflatten_and_copy_device_tree(); +#else + unflatten_device_tree(); +#endif +#endif + + paging_init(); + + /* Perform the machine specific initialisation */ + if (likely(sh_mv.mv_setup)) + sh_mv.mv_setup(cmdline_p); + + plat_smp_setup(); +} + +/* processor boot mode configuration */ +int generic_mode_pins(void) +{ + pr_warn("generic_mode_pins(): missing mode pin configuration\n"); + return 0; +} + +int test_mode_pin(int pin) +{ + return sh_mv.mv_mode_pins() & pin; +} + +void __init arch_cpu_finalize_init(void) +{ + char *p = &init_utsname()->machine[2]; /* "sh" */ + + select_idle_routine(); + + current_cpu_data.loops_per_jiffy = loops_per_jiffy; + + switch (current_cpu_data.family) { + case CPU_FAMILY_SH2: + *p++ = '2'; + break; + case CPU_FAMILY_SH2A: + *p++ = '2'; + *p++ = 'a'; + break; + case CPU_FAMILY_SH3: + *p++ = '3'; + break; + case CPU_FAMILY_SH4: + *p++ = '4'; + break; + case CPU_FAMILY_SH4A: + *p++ = '4'; + *p++ = 'a'; + break; + case CPU_FAMILY_SH4AL_DSP: + *p++ = '4'; + *p++ = 'a'; + *p++ = 'l'; + *p++ = '-'; + *p++ = 'd'; + *p++ = 's'; + *p++ = 'p'; + break; + case CPU_FAMILY_UNKNOWN: + /* + * Specifically use CPU_FAMILY_UNKNOWN rather than + * default:, so we're able to have the compiler whine + * about unhandled enumerations. + */ + break; + } + + pr_info("CPU: %s\n", get_cpu_subtype(¤t_cpu_data)); + +#ifndef __LITTLE_ENDIAN__ + /* 'eb' means 'Endian Big' */ + *p++ = 'e'; + *p++ = 'b'; +#endif + *p = '\0'; +} |