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setup.c
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/* * OpenRISC setup.c * * Linux architectural port borrowing liberally from similar works of * others. All original copyrights apply as per the original source * declaration. * * Modifications for the OpenRISC architecture: * Copyright (C) 2003 Matjaz Breskvar <phoenix@bsemi.com> * Copyright (C) 2010-2011 Jonas Bonn <jonas@southpole.se> * * This program is free software; you can redistribute it and/or * modify it under the terms of the GNU General Public License * as published by the Free Software Foundation; either version * 2 of the License, or (at your option) any later version. * * This file handles the architecture-dependent parts of initialization */ #include <linux/errno.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/tty.h> #include <linux/ioport.h> #include <linux/delay.h> #include <linux/console.h> #include <linux/init.h> #include <linux/bootmem.h> #include <linux/seq_file.h> #include <linux/serial.h> #include <linux/initrd.h> #include <linux/of_fdt.h> #include <linux/of.h> #include <linux/memblock.h> #include <linux/device.h> #include <linux/of_platform.h> #include <asm/segment.h> #include <asm/pgtable.h> #include <asm/types.h> #include <asm/setup.h> #include <asm/io.h> #include <asm/cpuinfo.h> #include <asm/delay.h> #include "vmlinux.h" char __initdata cmd_line[COMMAND_LINE_SIZE] = CONFIG_CMDLINE; static unsigned long __init setup_memory(void) { unsigned long bootmap_size; unsigned long ram_start_pfn; unsigned long free_ram_start_pfn; unsigned long ram_end_pfn; phys_addr_t memory_start, memory_end; struct memblock_region *region; memory_end = memory_start = 0; /* Find main memory where is the kernel */ for_each_memblock(memory, region) { memory_start = region->base; memory_end = region->base + region->size; printk(KERN_INFO "%s: Memory: 0x%x-0x%x\n", __func__, memory_start, memory_end); } if (!memory_end) { panic("No memory!"); } ram_start_pfn = PFN_UP(memory_start); /* free_ram_start_pfn is first page after kernel */ free_ram_start_pfn = PFN_UP(__pa(&_end)); ram_end_pfn = PFN_DOWN(memblock_end_of_DRAM()); max_pfn = ram_end_pfn; /* * initialize the boot-time allocator (with low memory only). * * This makes the memory from the end of the kernel to the end of * RAM usable. * init_bootmem sets the global values min_low_pfn, max_low_pfn. */ bootmap_size = init_bootmem(free_ram_start_pfn, ram_end_pfn - ram_start_pfn); free_bootmem(PFN_PHYS(free_ram_start_pfn), (ram_end_pfn - free_ram_start_pfn) << PAGE_SHIFT); reserve_bootmem(PFN_PHYS(free_ram_start_pfn), bootmap_size, BOOTMEM_DEFAULT); for_each_memblock(reserved, region) { printk(KERN_INFO "Reserved - 0x%08x-0x%08x\n", (u32) region->base, (u32) region->size); reserve_bootmem(region->base, region->size, BOOTMEM_DEFAULT); } return ram_end_pfn; } struct cpuinfo cpuinfo; static void print_cpuinfo(void) { unsigned long upr = mfspr(SPR_UPR); unsigned long vr = mfspr(SPR_VR); unsigned int version; unsigned int revision; version = (vr & SPR_VR_VER) >> 24; revision = (vr & SPR_VR_REV); printk(KERN_INFO "CPU: OpenRISC-%x (revision %d) @%d MHz\n", version, revision, cpuinfo.clock_frequency / 1000000); if (!(upr & SPR_UPR_UP)) { printk(KERN_INFO "-- no UPR register... unable to detect configuration\n"); return; } if (upr & SPR_UPR_DCP) printk(KERN_INFO "-- dcache: %4d bytes total, %2d bytes/line, %d way(s)\n", cpuinfo.dcache_size, cpuinfo.dcache_block_size, 1); else printk(KERN_INFO "-- dcache disabled\n"); if (upr & SPR_UPR_ICP) printk(KERN_INFO "-- icache: %4d bytes total, %2d bytes/line, %d way(s)\n", cpuinfo.icache_size, cpuinfo.icache_block_size, 1); else printk(KERN_INFO "-- icache disabled\n"); if (upr & SPR_UPR_DMP) printk(KERN_INFO "-- dmmu: %4d entries, %lu way(s)\n", 1 << ((mfspr(SPR_DMMUCFGR) & SPR_DMMUCFGR_NTS) >> 2), 1 + (mfspr(SPR_DMMUCFGR) & SPR_DMMUCFGR_NTW)); if (upr & SPR_UPR_IMP) printk(KERN_INFO "-- immu: %4d entries, %lu way(s)\n", 1 << ((mfspr(SPR_IMMUCFGR) & SPR_IMMUCFGR_NTS) >> 2), 1 + (mfspr(SPR_IMMUCFGR) & SPR_IMMUCFGR_NTW)); printk(KERN_INFO "-- additional features:\n"); if (upr & SPR_UPR_DUP) printk(KERN_INFO "-- debug unit\n"); if (upr & SPR_UPR_PCUP) printk(KERN_INFO "-- performance counters\n"); if (upr & SPR_UPR_PMP) printk(KERN_INFO "-- power management\n"); if (upr & SPR_UPR_PICP) printk(KERN_INFO "-- PIC\n"); if (upr & SPR_UPR_TTP) printk(KERN_INFO "-- timer\n"); if (upr & SPR_UPR_CUP) printk(KERN_INFO "-- custom unit(s)\n"); } void __init setup_cpuinfo(void) { struct device_node *cpu; unsigned long iccfgr, dccfgr; unsigned long cache_set_size, cache_ways; cpu = of_find_compatible_node(NULL, NULL, "opencores,or1200-rtlsvn481"); if (!cpu) panic("No compatible CPU found in device tree...\n"); iccfgr = mfspr(SPR_ICCFGR); cache_ways = 1 << (iccfgr & SPR_ICCFGR_NCW); cache_set_size = 1 << ((iccfgr & SPR_ICCFGR_NCS) >> 3); cpuinfo.icache_block_size = 16 << ((iccfgr & SPR_ICCFGR_CBS) >> 7); cpuinfo.icache_size = cache_set_size * cache_ways * cpuinfo.icache_block_size; dccfgr = mfspr(SPR_DCCFGR); cache_ways = 1 << (dccfgr & SPR_DCCFGR_NCW); cache_set_size = 1 << ((dccfgr & SPR_DCCFGR_NCS) >> 3); cpuinfo.dcache_block_size = 16 << ((dccfgr & SPR_DCCFGR_CBS) >> 7); cpuinfo.dcache_size = cache_set_size * cache_ways * cpuinfo.dcache_block_size; if (of_property_read_u32(cpu, "clock-frequency", &cpuinfo.clock_frequency)) { printk(KERN_WARNING "Device tree missing CPU 'clock-frequency' parameter." "Assuming frequency 25MHZ" "This is probably not what you want."); } of_node_put(cpu); print_cpuinfo(); } /** * or32_early_setup * * Handles the pointer to the device tree that this kernel is to use * for establishing the available platform devices. * * Falls back on built-in device tree in case null pointer is passed. */ void __init or32_early_setup(unsigned int fdt) { if (fdt) { early_init_devtree((void*) fdt); printk(KERN_INFO "FDT at 0x%08x\n", fdt); } else { early_init_devtree(__dtb_start); printk(KERN_INFO "Compiled-in FDT at %p\n", __dtb_start); } } static int __init openrisc_device_probe(void) { of_platform_populate(NULL, NULL, NULL, NULL); return 0; } device_initcall(openrisc_device_probe); static inline unsigned long extract_value_bits(unsigned long reg, short bit_nr, short width) { return (reg >> bit_nr) & (0 << width); } static inline unsigned long extract_value(unsigned long reg, unsigned long mask) { while (!(mask & 0x1)) { reg = reg >> 1; mask = mask >> 1; } return mask & reg; } void __init detect_unit_config(unsigned long upr, unsigned long mask, char *text, void (*func) (void)) { if (text != NULL) printk("%s", text); if (upr & mask) { if (func != NULL) func(); else printk("present\n"); } else printk("not present\n"); } /* * calibrate_delay * * Lightweight calibrate_delay implementation that calculates loops_per_jiffy * from the clock frequency passed in via the device tree * */ void calibrate_delay(void) { const int *val; struct device_node *cpu = NULL; cpu = of_find_compatible_node(NULL, NULL, "opencores,or1200-rtlsvn481"); val = of_get_property(cpu, "clock-frequency", NULL); if (!val) panic("no cpu 'clock-frequency' parameter in device tree"); loops_per_jiffy = *val / HZ; pr_cont("%lu.%02lu BogoMIPS (lpj=%lu)\n", loops_per_jiffy / (500000 / HZ), (loops_per_jiffy / (5000 / HZ)) % 100, loops_per_jiffy); } void __init setup_arch(char **cmdline_p) { unsigned long max_low_pfn; unflatten_device_tree(); setup_cpuinfo(); /* process 1's initial memory region is the kernel code/data */ 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)&_end; #ifdef CONFIG_BLK_DEV_INITRD initrd_start = (unsigned long)&__initrd_start; initrd_end = (unsigned long)&__initrd_end; if (initrd_start == initrd_end) { initrd_start = 0; initrd_end = 0; } initrd_below_start_ok = 1; #endif /* setup bootmem allocator */ max_low_pfn = setup_memory(); /* paging_init() sets up the MMU and marks all pages as reserved */ paging_init(); #if defined(CONFIG_VT) && defined(CONFIG_DUMMY_CONSOLE) if (!conswitchp) conswitchp = &dummy_con; #endif *cmdline_p = cmd_line; printk(KERN_INFO "OpenRISC Linux -- http://openrisc.net\n"); } static int show_cpuinfo(struct seq_file *m, void *v) { unsigned long vr; int version, revision; vr = mfspr(SPR_VR); version = (vr & SPR_VR_VER) >> 24; revision = vr & SPR_VR_REV; return seq_printf(m, "cpu\t\t: OpenRISC-%x\n" "revision\t: %d\n" "frequency\t: %ld\n" "dcache size\t: %d bytes\n" "dcache block size\t: %d bytes\n" "icache size\t: %d bytes\n" "icache block size\t: %d bytes\n" "immu\t\t: %d entries, %lu ways\n" "dmmu\t\t: %d entries, %lu ways\n" "bogomips\t: %lu.%02lu\n", version, revision, loops_per_jiffy * HZ, cpuinfo.dcache_size, cpuinfo.dcache_block_size, cpuinfo.icache_size, cpuinfo.icache_block_size, 1 << ((mfspr(SPR_DMMUCFGR) & SPR_DMMUCFGR_NTS) >> 2), 1 + (mfspr(SPR_DMMUCFGR) & SPR_DMMUCFGR_NTW), 1 << ((mfspr(SPR_IMMUCFGR) & SPR_IMMUCFGR_NTS) >> 2), 1 + (mfspr(SPR_IMMUCFGR) & SPR_IMMUCFGR_NTW), (loops_per_jiffy * HZ) / 500000, ((loops_per_jiffy * HZ) / 5000) % 100); } static void *c_start(struct seq_file *m, loff_t * pos) { /* We only have one CPU... */ return *pos < 1 ? (void *)1 : NULL; } static void *c_next(struct seq_file *m, void *v, loff_t * pos) { ++*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, };
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