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/*
* (C) Copyright 2007
* Stefan Roese, DENX Software Engineering, sr@denx.de.
*
* See file CREDITS for list of people who contributed to this
* project.
*
* 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 program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston,
* MA 02111-1307 USA
*/
#include <common.h>
#if defined(CONFIG_440)
#include <ppc4xx.h>
#include <ppc440.h>
#include <asm/io.h>
#include <asm/mmu.h>
typedef struct region {
unsigned long base;
unsigned long size;
unsigned long tlb_word2_i_value;
} region_t;
static int add_tlb_entry(unsigned long base_addr,
unsigned long tlb_word0_size_value,
unsigned long tlb_word2_i_value)
{
int i;
unsigned long tlb_word0_value;
unsigned long tlb_word1_value;
unsigned long tlb_word2_value;
/* First, find the index of a TLB entry not being used */
for (i=0; i<PPC4XX_TLB_SIZE; i++) {
tlb_word0_value = mftlb1(i);
if ((tlb_word0_value & TLB_WORD0_V_MASK) == TLB_WORD0_V_DISABLE)
break;
}
if (i >= PPC4XX_TLB_SIZE)
return -1;
/* Second, create the TLB entry */
tlb_word0_value = TLB_WORD0_EPN_ENCODE(base_addr) | TLB_WORD0_V_ENABLE |
TLB_WORD0_TS_0 | tlb_word0_size_value;
tlb_word1_value = TLB_WORD1_RPN_ENCODE(base_addr) | TLB_WORD1_ERPN_ENCODE(0);
tlb_word2_value = TLB_WORD2_U0_DISABLE | TLB_WORD2_U1_DISABLE |
TLB_WORD2_U2_DISABLE | TLB_WORD2_U3_DISABLE |
TLB_WORD2_W_DISABLE | tlb_word2_i_value |
TLB_WORD2_M_DISABLE | TLB_WORD2_G_DISABLE |
TLB_WORD2_E_DISABLE | TLB_WORD2_UX_ENABLE |
TLB_WORD2_UW_ENABLE | TLB_WORD2_UR_ENABLE |
TLB_WORD2_SX_ENABLE | TLB_WORD2_SW_ENABLE |
TLB_WORD2_SR_ENABLE;
/* Wait for all memory accesses to complete */
sync();
/* Third, add the TLB entries */
mttlb1(i, tlb_word0_value);
mttlb2(i, tlb_word1_value);
mttlb3(i, tlb_word2_value);
/* Execute an ISYNC instruction so that the new TLB entry takes effect */
asm("isync");
return 0;
}
static void program_tlb_addr(unsigned long base_addr, unsigned long mem_size,
unsigned long tlb_word2_i_value)
{
int rc;
int tlb_i;
tlb_i = tlb_word2_i_value;
while (mem_size != 0) {
rc = 0;
/* Add the TLB entries in to map the region. */
if (((base_addr & TLB_256MB_ALIGN_MASK) == base_addr) &&
(mem_size >= TLB_256MB_SIZE)) {
/* Add a 256MB TLB entry */
if ((rc = add_tlb_entry(base_addr, TLB_WORD0_SIZE_256MB, tlb_i)) == 0) {
mem_size -= TLB_256MB_SIZE;
base_addr += TLB_256MB_SIZE;
}
} else if (((base_addr & TLB_16MB_ALIGN_MASK) == base_addr) &&
(mem_size >= TLB_16MB_SIZE)) {
/* Add a 16MB TLB entry */
if ((rc = add_tlb_entry(base_addr, TLB_WORD0_SIZE_16MB, tlb_i)) == 0) {
mem_size -= TLB_16MB_SIZE;
base_addr += TLB_16MB_SIZE;
}
} else if (((base_addr & TLB_1MB_ALIGN_MASK) == base_addr) &&
(mem_size >= TLB_1MB_SIZE)) {
/* Add a 1MB TLB entry */
if ((rc = add_tlb_entry(base_addr, TLB_WORD0_SIZE_1MB, tlb_i)) == 0) {
mem_size -= TLB_1MB_SIZE;
base_addr += TLB_1MB_SIZE;
}
} else if (((base_addr & TLB_256KB_ALIGN_MASK) == base_addr) &&
(mem_size >= TLB_256KB_SIZE)) {
/* Add a 256KB TLB entry */
if ((rc = add_tlb_entry(base_addr, TLB_WORD0_SIZE_256KB, tlb_i)) == 0) {
mem_size -= TLB_256KB_SIZE;
base_addr += TLB_256KB_SIZE;
}
} else if (((base_addr & TLB_64KB_ALIGN_MASK) == base_addr) &&
(mem_size >= TLB_64KB_SIZE)) {
/* Add a 64KB TLB entry */
if ((rc = add_tlb_entry(base_addr, TLB_WORD0_SIZE_64KB, tlb_i)) == 0) {
mem_size -= TLB_64KB_SIZE;
base_addr += TLB_64KB_SIZE;
}
} else if (((base_addr & TLB_16KB_ALIGN_MASK) == base_addr) &&
(mem_size >= TLB_16KB_SIZE)) {
/* Add a 16KB TLB entry */
if ((rc = add_tlb_entry(base_addr, TLB_WORD0_SIZE_16KB, tlb_i)) == 0) {
mem_size -= TLB_16KB_SIZE;
base_addr += TLB_16KB_SIZE;
}
} else if (((base_addr & TLB_4KB_ALIGN_MASK) == base_addr) &&
(mem_size >= TLB_4KB_SIZE)) {
/* Add a 4KB TLB entry */
if ((rc = add_tlb_entry(base_addr, TLB_WORD0_SIZE_4KB, tlb_i)) == 0) {
mem_size -= TLB_4KB_SIZE;
base_addr += TLB_4KB_SIZE;
}
} else if (((base_addr & TLB_1KB_ALIGN_MASK) == base_addr) &&
(mem_size >= TLB_1KB_SIZE)) {
/* Add a 1KB TLB entry */
if ((rc = add_tlb_entry(base_addr, TLB_WORD0_SIZE_1KB, tlb_i)) == 0) {
mem_size -= TLB_1KB_SIZE;
base_addr += TLB_1KB_SIZE;
}
} else {
printf("ERROR: no TLB size exists for the base address 0x%0X.\n",
base_addr);
}
if (rc != 0)
printf("ERROR: no TLB entries available for the base addr 0x%0X.\n",
base_addr);
}
return;
}
/*
* Program one (or multiple) TLB entries for one memory region
*
* Common usage for boards with SDRAM DIMM modules to dynamically
* configure the TLB's for the SDRAM
*/
void program_tlb(u32 start, u32 size)
{
region_t region_array;
region_array.base = start;
region_array.size = size;
region_array.tlb_word2_i_value = TLB_WORD2_I_ENABLE; /* disable cache (for now) */
/* Call the routine to add in the tlb entries for the memory regions */
program_tlb_addr(region_array.base, region_array.size,
region_array.tlb_word2_i_value);
return;
}
#endif /* CONFIG_440 */
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