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/*
* Modifications by Kumar Gala (galak@kernel.crashing.org) to support
* E500 Book E processors.
*
* Copyright 2004 Freescale Semiconductor, Inc
*
* This file contains the routines for initializing the MMU
* on the 4xx series of chips.
* -- paulus
*
* Derived from arch/ppc/mm/init.c:
* Copyright (C) 1995-1996 Gary Thomas (gdt@linuxppc.org)
*
* Modifications by Paul Mackerras (PowerMac) (paulus@cs.anu.edu.au)
* and Cort Dougan (PReP) (cort@cs.nmt.edu)
* Copyright (C) 1996 Paul Mackerras
*
* Derived from "arch/i386/mm/init.c"
* Copyright (C) 1991, 1992, 1993, 1994 Linus Torvalds
*
* 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.
*
*/
#include <linux/signal.h>
#include <linux/sched.h>
#include <linux/kernel.h>
#include <linux/errno.h>
#include <linux/string.h>
#include <linux/types.h>
#include <linux/ptrace.h>
#include <linux/mman.h>
#include <linux/mm.h>
#include <linux/swap.h>
#include <linux/stddef.h>
#include <linux/vmalloc.h>
#include <linux/init.h>
#include <linux/delay.h>
#include <linux/highmem.h>
#include <asm/pgalloc.h>
#include <asm/prom.h>
#include <asm/io.h>
#include <asm/mmu_context.h>
#include <asm/pgtable.h>
#include <asm/mmu.h>
#include <asm/uaccess.h>
#include <asm/smp.h>
#include <asm/bootx.h>
#include <asm/machdep.h>
#include <asm/setup.h>
extern void loadcam_entry(unsigned int index);
unsigned int tlbcam_index;
unsigned int num_tlbcam_entries;
static unsigned long __cam0, __cam1, __cam2;
extern unsigned long total_lowmem;
extern unsigned long __max_low_memory;
extern unsigned long __initial_memory_limit;
#define MAX_LOW_MEM CONFIG_LOWMEM_SIZE
#define NUM_TLBCAMS (16)
struct tlbcam {
u32 MAS0;
u32 MAS1;
u32 MAS2;
u32 MAS3;
u32 MAS7;
} TLBCAM[NUM_TLBCAMS];
struct tlbcamrange {
unsigned long start;
unsigned long limit;
phys_addr_t phys;
} tlbcam_addrs[NUM_TLBCAMS];
extern unsigned int tlbcam_index;
/*
* Return PA for this VA if it is mapped by a CAM, or 0
*/
unsigned long v_mapped_by_tlbcam(unsigned long va)
{
int b;
for (b = 0; b < tlbcam_index; ++b)
if (va >= tlbcam_addrs[b].start && va < tlbcam_addrs[b].limit)
return tlbcam_addrs[b].phys + (va - tlbcam_addrs[b].start);
return 0;
}
/*
* Return VA for a given PA or 0 if not mapped
*/
unsigned long p_mapped_by_tlbcam(unsigned long pa)
{
int b;
for (b = 0; b < tlbcam_index; ++b)
if (pa >= tlbcam_addrs[b].phys
&& pa < (tlbcam_addrs[b].limit-tlbcam_addrs[b].start)
+tlbcam_addrs[b].phys)
return tlbcam_addrs[b].start+(pa-tlbcam_addrs[b].phys);
return 0;
}
/*
* Set up one of the I/D BAT (block address translation) register pairs.
* The parameters are not checked; in particular size must be a power
* of 4 between 4k and 256M.
*/
void settlbcam(int index, unsigned long virt, phys_addr_t phys,
unsigned int size, int flags, unsigned int pid)
{
unsigned int tsize, lz;
asm ("cntlzw %0,%1" : "=r" (lz) : "r" (size));
tsize = (21 - lz) / 2;
#ifdef CONFIG_SMP
if ((flags & _PAGE_NO_CACHE) == 0)
flags |= _PAGE_COHERENT;
#endif
TLBCAM[index].MAS0 = MAS0_TLBSEL(1) | MAS0_ESEL(index) | MAS0_NV(index+1);
TLBCAM[index].MAS1 = MAS1_VALID | MAS1_IPROT | MAS1_TSIZE(tsize) | MAS1_TID(pid);
TLBCAM[index].MAS2 = virt & PAGE_MASK;
TLBCAM[index].MAS2 |= (flags & _PAGE_WRITETHRU) ? MAS2_W : 0;
TLBCAM[index].MAS2 |= (flags & _PAGE_NO_CACHE) ? MAS2_I : 0;
TLBCAM[index].MAS2 |= (flags & _PAGE_COHERENT) ? MAS2_M : 0;
TLBCAM[index].MAS2 |= (flags & _PAGE_GUARDED) ? MAS2_G : 0;
TLBCAM[index].MAS2 |= (flags & _PAGE_ENDIAN) ? MAS2_E : 0;
TLBCAM[index].MAS3 = (phys & PAGE_MASK) | MAS3_SX | MAS3_SR;
TLBCAM[index].MAS3 |= ((flags & _PAGE_RW) ? MAS3_SW : 0);
#ifndef CONFIG_KGDB /* want user access for breakpoints */
if (flags & _PAGE_USER) {
TLBCAM[index].MAS3 |= MAS3_UX | MAS3_UR;
TLBCAM[index].MAS3 |= ((flags & _PAGE_RW) ? MAS3_UW : 0);
}
#else
TLBCAM[index].MAS3 |= MAS3_UX | MAS3_UR;
TLBCAM[index].MAS3 |= ((flags & _PAGE_RW) ? MAS3_UW : 0);
#endif
tlbcam_addrs[index].start = virt;
tlbcam_addrs[index].limit = virt + size - 1;
tlbcam_addrs[index].phys = phys;
loadcam_entry(index);
}
void invalidate_tlbcam_entry(int index)
{
TLBCAM[index].MAS0 = MAS0_TLBSEL(1) | MAS0_ESEL(index);
TLBCAM[index].MAS1 = ~MAS1_VALID;
loadcam_entry(index);
}
void __init cam_mapin_ram(unsigned long cam0, unsigned long cam1,
unsigned long cam2)
{
settlbcam(0, PAGE_OFFSET, PPC_MEMSTART, cam0, _PAGE_KERNEL, 0);
tlbcam_index++;
if (cam1) {
tlbcam_index++;
settlbcam(1, PAGE_OFFSET+cam0, PPC_MEMSTART+cam0, cam1, _PAGE_KERNEL, 0);
}
if (cam2) {
tlbcam_index++;
settlbcam(2, PAGE_OFFSET+cam0+cam1, PPC_MEMSTART+cam0+cam1, cam2, _PAGE_KERNEL, 0);
}
}
/*
* MMU_init_hw does the chip-specific initialization of the MMU hardware.
*/
void __init MMU_init_hw(void)
{
flush_instruction_cache();
}
unsigned long __init mmu_mapin_ram(void)
{
cam_mapin_ram(__cam0, __cam1, __cam2);
return __cam0 + __cam1 + __cam2;
}
void __init
adjust_total_lowmem(void)
{
unsigned long max_low_mem = MAX_LOW_MEM;
unsigned long cam_max = 0x10000000;
unsigned long ram;
/* adjust CAM size to max_low_mem */
if (max_low_mem < cam_max)
cam_max = max_low_mem;
/* adjust lowmem size to max_low_mem */
if (max_low_mem < total_lowmem)
ram = max_low_mem;
else
ram = total_lowmem;
/* Calculate CAM values */
__cam0 = 1UL << 2 * (__ilog2(ram) / 2);
if (__cam0 > cam_max)
__cam0 = cam_max;
ram -= __cam0;
if (ram) {
__cam1 = 1UL << 2 * (__ilog2(ram) / 2);
if (__cam1 > cam_max)
__cam1 = cam_max;
ram -= __cam1;
}
if (ram) {
__cam2 = 1UL << 2 * (__ilog2(ram) / 2);
if (__cam2 > cam_max)
__cam2 = cam_max;
ram -= __cam2;
}
printk(KERN_INFO "Memory CAM mapping: CAM0=%ldMb, CAM1=%ldMb,"
" CAM2=%ldMb residual: %ldMb\n",
__cam0 >> 20, __cam1 >> 20, __cam2 >> 20,
(total_lowmem - __cam0 - __cam1 - __cam2) >> 20);
__max_low_memory = max_low_mem = __cam0 + __cam1 + __cam2;
__initial_memory_limit = __max_low_memory;
}
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