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/*
* (C) Copyright 2002 ELTEC Elektronik AG
* Frank Gottschling <fgottschling@eltec.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_SYS_L2_BAB7xx)
#include <pci.h>
#include <mpc106.h>
#include <asm/processor.h>
/* defines L2CR register for MPC750 */
#define L2CR_E 0x80000000
#define L2CR_256K 0x10000000
#define L2CR_512K 0x20000000
#define L2CR_1024K 0x30000000
#define L2CR_I 0x00200000
#define L2CR_SL 0x00008000
#define L2CR_IP 0x00000001
/*----------------------------------------------------------------------------*/
static int dummy (int dummy)
{
return (dummy+1);
}
/*----------------------------------------------------------------------------*/
int l2_cache_enable (int l2control)
{
if (l2control) /* BAB750 */
{
mtspr(SPRN_L2CR, l2control);
mtspr(SPRN_L2CR, (l2control | L2CR_I));
while (mfspr(SPRN_L2CR) & L2CR_IP)
;
mtspr(SPRN_L2CR, (l2control | L2CR_E));
return (0);
}
else /* BAB740 */
{
int picr1, picr2, mask;
int picr2CacheSize, cacheSize;
int *d;
int devbusfn;
u32 reg32;
devbusfn = pci_find_device(PCI_VENDOR_ID_MOTOROLA,
PCI_DEVICE_ID_MOTOROLA_MPC106, 0);
if (devbusfn == -1)
return (-1);
pci_read_config_dword (devbusfn, PCI_PICR2, ®32);
reg32 &= ~PICR2_L2_EN;
pci_write_config_dword (devbusfn, PCI_PICR2, reg32);
/* cache size */
if (*(volatile unsigned char *) (CONFIG_SYS_ISA_IO + 0x220) & 0x04)
{
/* cache size is 512 KB */
picr2CacheSize = PICR2_L2_SIZE_512K;
cacheSize = 0x80000;
}
else
{
/* cache size is 256 KB */
picr2CacheSize = PICR2_L2_SIZE_256K;
cacheSize = 0x40000;
}
/* setup PICR1 */
mask =
~(PICR1_CF_BREAD_WS(1) |
PICR1_CF_BREAD_WS(2) |
PICR1_CF_CBA(0xff) |
PICR1_CF_CACHE_1G |
PICR1_CF_DPARK |
PICR1_CF_APARK |
PICR1_CF_L2_CACHE_MASK);
picr1 =
(PICR1_CF_CBA(0x3f) |
PICR1_CF_CACHE_1G |
PICR1_CF_APARK |
PICR1_CF_DPARK |
PICR1_CF_L2_COPY_BACK); /* PICR1_CF_L2_WRITE_THROUGH */
pci_read_config_dword (devbusfn, PCI_PICR1, ®32);
reg32 &= mask;
reg32 |= picr1;
pci_write_config_dword (devbusfn, PCI_PICR1, reg32);
/*
* invalidate all L2 cache
*/
picr2 =
(PICR2_CF_INV_MODE |
PICR2_CF_HIT_HIGH |
PICR2_CF_MOD_HIGH |
PICR2_CF_L2_HIT_DELAY(1) |
PICR2_CF_APHASE_WS(1) |
picr2CacheSize);
pci_write_config_dword (devbusfn, PCI_PICR2, picr2);
/*
* dummy transactions
*/
for (d=0; d<(int *)(2*cacheSize); d++)
dummy(*d);
pci_write_config_dword (devbusfn, PCI_PICR2,
(picr2 | PICR2_CF_FLUSH_L2));
/* setup PICR2 */
picr2 =
(PICR2_CF_FAST_CASTOUT |
PICR2_CF_WDATA |
PICR2_CF_ADDR_ONLY_DISABLE |
PICR2_CF_HIT_HIGH |
PICR2_CF_MOD_HIGH |
PICR2_L2_UPDATE_EN |
PICR2_L2_EN |
PICR2_CF_APHASE_WS(1) |
PICR2_CF_DATA_RAM_PBURST |
PICR2_CF_L2_HIT_DELAY(1) |
PICR2_CF_SNOOP_WS(2) |
picr2CacheSize);
pci_write_config_dword (devbusfn, PCI_PICR2, picr2);
}
return (0);
}
/*----------------------------------------------------------------------------*/
#endif /* (CONFIG_SYS_L2_BAB7xx) */
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