/*
 * Modifications by Kumar Gala (galak@kernel.crashing.org) to support
 * E500 Book E processors.
 *
 * Copyright 2004,2010 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 <linux/memblock.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/machdep.h>
#include <asm/setup.h>

#include "mmu_decl.h"

unsigned int tlbcam_index;

#define NUM_TLBCAMS     (64)
struct tlbcam TLBCAM[NUM_TLBCAMS];

struct tlbcamrange {
        unsigned long start;
        unsigned long limit;
        phys_addr_t phys;
} tlbcam_addrs[NUM_TLBCAMS];

extern unsigned int tlbcam_index;

unsigned long tlbcam_sz(int idx)
{
        return tlbcam_addrs[idx].limit - tlbcam_addrs[idx].start + 1;
}

/*
 * Return PA for this VA if it is mapped by a CAM, or 0
 */
phys_addr_t 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(phys_addr_t 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 a variable-size TLB entry (tlbcam). The parameters are not checked;
 * in particular size must be a power of 4 between 4k and 256M (or 1G, for cpus
 * that support extended page sizes).  Note that while some cpus support a
 * page size of 4G, we don't allow its use here.
 */
static void settlbcam(int index, unsigned long virt, phys_addr_t phys,
                unsigned long size, unsigned long flags, unsigned int pid)
{
        unsigned int tsize, lz;

        asm (PPC_CNTLZL "%0,%1" : "=r" (lz) : "r" (size));
        tsize = 21 - lz;

#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 & MAS3_RPN) | MAS3_SX | MAS3_SR;
        TLBCAM[index].MAS3 |= ((flags & _PAGE_RW) ? MAS3_SW : 0);
        if (mmu_has_feature(MMU_FTR_BIG_PHYS))
                TLBCAM[index].MAS7 = (u64)phys >> 32;

        /* Below is unlikely -- only for large user pages or similar */
        if (pte_user(flags)) {
           TLBCAM[index].MAS3 |= MAS3_UX | MAS3_UR;
           TLBCAM[index].MAS3 |= ((flags & _PAGE_RW) ? MAS3_UW : 0);
        }

        tlbcam_addrs[index].start = virt;
        tlbcam_addrs[index].limit = virt + size - 1;
        tlbcam_addrs[index].phys = phys;

        loadcam_entry(index);
}

unsigned long map_mem_in_cams(unsigned long ram, int max_cam_idx)
{
        int i;
        unsigned long virt = PAGE_OFFSET;
        phys_addr_t phys = memstart_addr;
        unsigned long amount_mapped = 0;
        unsigned long max_cam = (mfspr(SPRN_TLB1CFG) >> 16) & 0xf;

        /* Convert (4^max) kB to (2^max) bytes */
        max_cam = max_cam * 2 + 10;

        /* Calculate CAM values */
        for (i = 0; ram && i < max_cam_idx; i++) {
                unsigned int camsize = __ilog2(ram) & ~1U;
                unsigned int align = __ffs(virt | phys) & ~1U;
                unsigned long cam_sz;

                if (camsize > align)
                        camsize = align;
                if (camsize > max_cam)
                        camsize = max_cam;

                cam_sz = 1UL << camsize;
                settlbcam(i, virt, phys, cam_sz, PAGE_KERNEL_X, 0);

                ram -= cam_sz;
                amount_mapped += cam_sz;
                virt += cam_sz;
                phys += cam_sz;
        }
        tlbcam_index = i;

        return amount_mapped;
}

#ifdef CONFIG_PPC32

#if defined(CONFIG_LOWMEM_CAM_NUM_BOOL) && (CONFIG_LOWMEM_CAM_NUM >= NUM_TLBCAMS)
#error "LOWMEM_CAM_NUM must be less than NUM_TLBCAMS"
#endif

unsigned long __init mmu_mapin_ram(unsigned long top)
{
        return tlbcam_addrs[tlbcam_index - 1].limit - PAGE_OFFSET + 1;
}

/*
 * MMU_init_hw does the chip-specific initialization of the MMU hardware.
 */
void __init MMU_init_hw(void)
{
        flush_instruction_cache();
}

void __init adjust_total_lowmem(void)
{
        unsigned long ram;
        int i;

        /* adjust lowmem size to __max_low_memory */
        ram = min((phys_addr_t)__max_low_memory, (phys_addr_t)total_lowmem);

        __max_low_memory = map_mem_in_cams(ram, CONFIG_LOWMEM_CAM_NUM);

        pr_info("Memory CAM mapping: ");
        for (i = 0; i < tlbcam_index - 1; i++)
                pr_cont("%lu/", tlbcam_sz(i) >> 20);
        pr_cont("%lu Mb, residual: %dMb\n", tlbcam_sz(tlbcam_index - 1) >> 20,
                (unsigned int)((total_lowmem - __max_low_memory) >> 20));

        memblock_set_current_limit(memstart_addr + __max_low_memory);
}

void setup_initial_memory_limit(phys_addr_t first_memblock_base,
                                phys_addr_t first_memblock_size)
{
        phys_addr_t limit = first_memblock_base + first_memblock_size;

        /* 64M mapped initially according to head_fsl_booke.S */
        memblock_set_current_limit(min_t(u64, limit, 0x04000000));
}
#endif