linux/arch/openrisc/kernel/setup.c
Linus Torvalds 0195c00244 Disintegrate and delete asm/system.h
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Merge tag 'split-asm_system_h-for-linus-20120328' of git://git.kernel.org/pub/scm/linux/kernel/git/dhowells/linux-asm_system

Pull "Disintegrate and delete asm/system.h" from David Howells:
 "Here are a bunch of patches to disintegrate asm/system.h into a set of
  separate bits to relieve the problem of circular inclusion
  dependencies.

  I've built all the working defconfigs from all the arches that I can
  and made sure that they don't break.

  The reason for these patches is that I recently encountered a circular
  dependency problem that came about when I produced some patches to
  optimise get_order() by rewriting it to use ilog2().

  This uses bitops - and on the SH arch asm/bitops.h drags in
  asm-generic/get_order.h by a circuituous route involving asm/system.h.

  The main difficulty seems to be asm/system.h.  It holds a number of
  low level bits with no/few dependencies that are commonly used (eg.
  memory barriers) and a number of bits with more dependencies that
  aren't used in many places (eg.  switch_to()).

  These patches break asm/system.h up into the following core pieces:

    (1) asm/barrier.h

        Move memory barriers here.  This already done for MIPS and Alpha.

    (2) asm/switch_to.h

        Move switch_to() and related stuff here.

    (3) asm/exec.h

        Move arch_align_stack() here.  Other process execution related bits
        could perhaps go here from asm/processor.h.

    (4) asm/cmpxchg.h

        Move xchg() and cmpxchg() here as they're full word atomic ops and
        frequently used by atomic_xchg() and atomic_cmpxchg().

    (5) asm/bug.h

        Move die() and related bits.

    (6) asm/auxvec.h

        Move AT_VECTOR_SIZE_ARCH here.

  Other arch headers are created as needed on a per-arch basis."

Fixed up some conflicts from other header file cleanups and moving code
around that has happened in the meantime, so David's testing is somewhat
weakened by that.  We'll find out anything that got broken and fix it..

* tag 'split-asm_system_h-for-linus-20120328' of git://git.kernel.org/pub/scm/linux/kernel/git/dhowells/linux-asm_system: (38 commits)
  Delete all instances of asm/system.h
  Remove all #inclusions of asm/system.h
  Add #includes needed to permit the removal of asm/system.h
  Move all declarations of free_initmem() to linux/mm.h
  Disintegrate asm/system.h for OpenRISC
  Split arch_align_stack() out from asm-generic/system.h
  Split the switch_to() wrapper out of asm-generic/system.h
  Move the asm-generic/system.h xchg() implementation to asm-generic/cmpxchg.h
  Create asm-generic/barrier.h
  Make asm-generic/cmpxchg.h #include asm-generic/cmpxchg-local.h
  Disintegrate asm/system.h for Xtensa
  Disintegrate asm/system.h for Unicore32 [based on ver #3, changed by gxt]
  Disintegrate asm/system.h for Tile
  Disintegrate asm/system.h for Sparc
  Disintegrate asm/system.h for SH
  Disintegrate asm/system.h for Score
  Disintegrate asm/system.h for S390
  Disintegrate asm/system.h for PowerPC
  Disintegrate asm/system.h for PA-RISC
  Disintegrate asm/system.h for MN10300
  ...
2012-03-28 15:58:21 -07:00

381 lines
9.9 KiB
C

/*
* 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 __cpuinit 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,
};