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3b4bd2d75c
This patch adds support to detect the amount of DDR2 SDRAM on PMC440 modules. Detection is done by probing through a list of available and supported hardware configurations from 1GByte down to 256MB. The static TLB entry is replaced by dynamically created entries. Signed-off-by: Matthias Fuchs <matthias.fuchs@esd.eu> Signed-off-by: Stefan Roese <sr@denx.de>
118 lines
3.8 KiB
ArmAsm
118 lines
3.8 KiB
ArmAsm
/*
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*
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* See file CREDITS for list of people who contributed to this
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* project.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License as
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* published by the Free Software Foundation; either version 2 of
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* the License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston,
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* MA 02111-1307 USA
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*/
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#include <ppc_asm.tmpl>
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#include <asm-ppc/mmu.h>
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#include <config.h>
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/*
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* TLB TABLE
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*
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* This table is used by the cpu boot code to setup the initial tlb
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* entries. Rather than make broad assumptions in the cpu source tree,
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* this table lets each board set things up however they like.
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*
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* Pointer to the table is returned in r1
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*
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*/
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.section .bootpg,"ax"
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.globl tlbtab
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tlbtab:
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tlbtab_start
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/*
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* BOOT_CS (FLASH) must be first. Before relocation SA_I can be off to use the
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* speed up boot process. It is patched after relocation to enable SA_I
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*/
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#ifndef CONFIG_NAND_SPL
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tlbentry( CONFIG_SYS_BOOT_BASE_ADDR, SZ_256M, CONFIG_SYS_BOOT_BASE_ADDR, 1, AC_R|AC_W|AC_X|SA_G )
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#else
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tlbentry( CONFIG_SYS_NAND_BOOT_SPL_SRC, SZ_4K, CONFIG_SYS_NAND_BOOT_SPL_SRC, 1, AC_R|AC_W|AC_X|SA_G )
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#endif
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/* TLB entries for DDR2 SDRAM are generated dynamically */
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#ifdef CONFIG_SYS_INIT_RAM_DCACHE
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/* TLB-entry for init-ram in dcache (SA_I must be turned off!) */
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tlbentry( CONFIG_SYS_INIT_RAM_ADDR, SZ_64K, CONFIG_SYS_INIT_RAM_ADDR, 0, AC_R|AC_W|AC_X|SA_G )
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#endif
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/* TLB-entry for PCI Memory */
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tlbentry( CONFIG_SYS_PCI_MEMBASE, SZ_256M, CONFIG_SYS_PCI_MEMBASE, 1, AC_R|AC_W|SA_G|SA_I )
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tlbentry( CONFIG_SYS_PCI_MEMBASE1, SZ_256M, CONFIG_SYS_PCI_MEMBASE1, 1, AC_R|AC_W|SA_G|SA_I )
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tlbentry( CONFIG_SYS_PCI_MEMBASE2, SZ_256M, CONFIG_SYS_PCI_MEMBASE2, 1, AC_R|AC_W|SA_G|SA_I )
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tlbentry( CONFIG_SYS_PCI_MEMBASE3, SZ_256M, CONFIG_SYS_PCI_MEMBASE3, 1, AC_R|AC_W|SA_G|SA_I )
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/* TLB-entries for EBC */
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/* PMC440 maps EBC to 0xef000000 which is handled by the peripheral
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* tlb entry.
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* This dummy entry is only for convinience in order not to modify the
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* amount of entries. Currently OS/9 relies on this :-)
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*/
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tlbentry( 0xc0000000, SZ_256M, 0xc0000000, 1, AC_R|AC_W|AC_X|SA_G|SA_I )
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/* TLB-entry for NAND */
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tlbentry( CONFIG_SYS_NAND_ADDR, SZ_1K, CONFIG_SYS_NAND_ADDR, 1, AC_R|AC_W|AC_X|SA_G|SA_I )
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/* TLB-entry for Internal Registers & OCM */
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tlbentry( 0xe0000000, SZ_16M, 0xe0000000, 0, AC_R|AC_W|AC_X|SA_I )
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/*TLB-entry PCI registers*/
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tlbentry( 0xEEC00000, SZ_1K, 0xEEC00000, 1, AC_R|AC_W|AC_X|SA_G|SA_I )
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/* TLB-entry for peripherals */
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tlbentry( 0xEF000000, SZ_16M, 0xEF000000, 1, AC_R|AC_W|AC_X|SA_G|SA_I)
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/* TLB-entry PCI IO space */
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tlbentry(0xE8000000, SZ_64K, 0xE8000000, 1, AC_R|AC_W|AC_X|SA_G|SA_I)
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/* TODO: what about high IO space */
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tlbtab_end
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#if defined(CONFIG_NAND_U_BOOT) && !defined(CONFIG_NAND_SPL)
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/*
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* For NAND booting the first TLB has to be reconfigured to full size
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* and with caching disabled after running from RAM!
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*/
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#define TLB00 TLB0(CONFIG_SYS_BOOT_BASE_ADDR, SZ_256M)
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#define TLB01 TLB1(CONFIG_SYS_BOOT_BASE_ADDR, 1)
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#define TLB02 TLB2(AC_R|AC_W|AC_X|SA_G|SA_I)
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.globl reconfig_tlb0
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reconfig_tlb0:
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sync
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isync
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addi r4,r0,0x0000 /* TLB entry #0 */
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lis r5,TLB00@h
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ori r5,r5,TLB00@l
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tlbwe r5,r4,0x0000 /* Save it out */
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lis r5,TLB01@h
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ori r5,r5,TLB01@l
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tlbwe r5,r4,0x0001 /* Save it out */
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lis r5,TLB02@h
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ori r5,r5,TLB02@l
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tlbwe r5,r4,0x0002 /* Save it out */
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sync
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isync
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blr
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#endif
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