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![Stefan Roese](/assets/img/avatar_default.png)
This patch enables the hardware-fix for the PCI/DMA errata's 19+22 by setting the FIXD bit in the SDR0_MFR register. Here a description of the symptoms: Problem Description ------------------------------ If a DMA is performed between memory and PCI with the DMA 1 Controller using prefetch, and as a result uses a special purpose buffer selected by the PCIXn Bridge Options 1 Register (PCIXn_BRDGOPT1[RBP7] - bits 31-29), the first part of the transfer sequence is performed twice. The PPC440SPe PCI Controller requests more data than was needed such that in the case of enforce memory protection, a host CPU exception can occur. No data is corrupted, because data transfer is stopped in the PCI Controller. Prefetch enable is specified by setting DMA Configuration Register (I2O0_DMAx_CFG[DXEPD] - bit 31) to 0. Behavior that may be observed in a running system --------------------------------------------------------------------------- 1. DMA performance is decreased because of the double access on the PCI bus interface. 2. If an illegal access to some address on the PCI bus is detected at the system level, a machine check or similar system error may occur. Workarounds Available ---------------------------------- 1. Do not program prefetch. Note that a prefetch command cannot be programmed without selecting a special purpose buffer. 2. To avoid crossing a physical boundary of the PCI slave device, add 512 bytes of address to the PCI address range. This patch was originally provided by Pravin M. Bathija <pbathija@amcc.com> from AMCC and slighly changed. Signed-off-by: Pravin M. Bathija <pbathija@amcc.com> Signed-off-by: Stefan Roese <sr@denx.de>
379 lines
11 KiB
C
379 lines
11 KiB
C
/*
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* (C) Copyright 2005
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* John Otken, jotken@softadvances.com
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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 <common.h>
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#include <command.h>
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#include <ppc4xx.h>
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#include <asm/processor.h>
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#include <spd_sdram.h>
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#include "epld.h"
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DECLARE_GLOBAL_DATA_PTR;
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extern flash_info_t flash_info[CFG_MAX_FLASH_BANKS]; /* info for FLASH chips */
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/*************************************************************************
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* int board_early_init_f()
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*
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************************************************************************/
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int board_early_init_f(void)
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{
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u32 mfr;
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mtebc( pb0ap, 0x03800000 ); /* set chip selects */
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mtebc( pb0cr, 0xffc58000 ); /* ebc0_b0cr, 4MB at 0xffc00000 CS0 */
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mtebc( pb1ap, 0x03800000 );
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mtebc( pb1cr, 0xff018000 ); /* ebc0_b1cr, 1MB at 0xff000000 CS1 */
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mtebc( pb2ap, 0x03800000 );
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mtebc( pb2cr, 0xff838000 ); /* ebc0_b2cr, 2MB at 0xff800000 CS2 */
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mtdcr( uic1sr, 0xffffffff ); /* Clear all interrupts */
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mtdcr( uic1er, 0x00000000 ); /* disable all interrupts */
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mtdcr( uic1cr, 0x00000000 ); /* Set Critical / Non Critical interrupts */
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mtdcr( uic1pr, 0x7fff83ff ); /* Set Interrupt Polarities */
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mtdcr( uic1tr, 0x001f8000 ); /* Set Interrupt Trigger Levels */
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mtdcr( uic1vr, 0x00000001 ); /* Set Vect base=0,INT31 Highest priority */
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mtdcr( uic1sr, 0x00000000 ); /* clear all interrupts */
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mtdcr( uic1sr, 0xffffffff );
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mtdcr( uic0sr, 0xffffffff ); /* Clear all interrupts */
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mtdcr( uic0er, 0x00000000 ); /* disable all interrupts excepted cascade */
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mtdcr( uic0cr, 0x00000001 ); /* Set Critical / Non Critical interrupts */
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mtdcr( uic0pr, 0xffffffff ); /* Set Interrupt Polarities */
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mtdcr( uic0tr, 0x01000004 ); /* Set Interrupt Trigger Levels */
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mtdcr( uic0vr, 0x00000001 ); /* Set Vect base=0,INT31 Highest priority */
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mtdcr( uic0sr, 0x00000000 ); /* clear all interrupts */
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mtdcr( uic0sr, 0xffffffff );
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mfsdr(sdr_mfr, mfr);
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mfr |= SDR0_MFR_FIXD; /* Workaround for PCI/DMA */
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mtsdr(sdr_mfr, mfr);
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return 0;
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}
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/*************************************************************************
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* int misc_init_r()
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*
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************************************************************************/
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int misc_init_r(void)
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{
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volatile epld_t *x = (epld_t *) CFG_EPLD_BASE;
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/* set modes of operation */
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x->ethuart |= EPLD2_ETH_MODE_10 | EPLD2_ETH_MODE_100 |
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EPLD2_ETH_MODE_1000 | EPLD2_ETH_DUPLEX_MODE;
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/* clear ETHERNET_AUTO_NEGO bit to turn on autonegotiation */
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x->ethuart &= ~EPLD2_ETH_AUTO_NEGO;
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/* put Ethernet+PHY in reset */
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x->ethuart &= ~EPLD2_RESET_ETH_N;
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udelay(10000);
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/* take Ethernet+PHY out of reset */
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x->ethuart |= EPLD2_RESET_ETH_N;
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return 0;
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}
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/*************************************************************************
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* int checkboard()
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*
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************************************************************************/
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int checkboard(void)
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{
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char *s = getenv("serial#");
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printf("Board: Luan - AMCC PPC440SP Evaluation Board");
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if (s != NULL) {
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puts(", serial# ");
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puts(s);
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}
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putc('\n');
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return 0;
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}
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/*
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* Override the default functions in cpu/ppc4xx/44x_spd_ddr2.c with
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* board specific values.
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*/
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u32 ddr_clktr(u32 default_val) {
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return (SDRAM_CLKTR_CLKP_180_DEG_ADV);
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}
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/*************************************************************************
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* int testdram()
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*
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************************************************************************/
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#if defined(CFG_DRAM_TEST)
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int testdram(void)
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{
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unsigned long *mem = (unsigned long *) 0;
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const unsigned long kend = (1024 / sizeof(unsigned long));
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unsigned long k, n;
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mtmsr(0);
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for (k = 0; k < CFG_KBYTES_SDRAM;
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++k, mem += (1024 / sizeof(unsigned long))) {
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if ((k & 1023) == 0) {
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printf("%3d MB\r", k / 1024);
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}
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memset(mem, 0xaaaaaaaa, 1024);
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for (n = 0; n < kend; ++n) {
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if (mem[n] != 0xaaaaaaaa) {
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printf("SDRAM test fails at: %08x\n",
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(uint) & mem[n]);
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return 1;
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}
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}
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memset(mem, 0x55555555, 1024);
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for (n = 0; n < kend; ++n) {
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if (mem[n] != 0x55555555) {
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printf("SDRAM test fails at: %08x\n",
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(uint) & mem[n]);
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return 1;
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}
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}
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}
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printf("SDRAM test passes\n");
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return 0;
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}
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#endif
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/*************************************************************************
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* pci_pre_init
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*
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* This routine is called just prior to registering the hose and gives
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* the board the opportunity to check things. Returning a value of zero
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* indicates that things are bad & PCI initialization should be aborted.
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*
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* Different boards may wish to customize the pci controller structure
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* (add regions, override default access routines, etc) or perform
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* certain pre-initialization actions.
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*
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************************************************************************/
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#if defined(CONFIG_PCI)
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int pci_pre_init( struct pci_controller *hose )
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{
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unsigned long strap;
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/*--------------------------------------------------------------------------+
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* The luan board is always configured as the host & requires the
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* PCI arbiter to be enabled.
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*--------------------------------------------------------------------------*/
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mfsdr(sdr_sdstp1, strap);
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if( (strap & SDR0_SDSTP1_PAE_MASK) == 0 ) {
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printf("PCI: SDR0_STRP1[%08lX] - PCI Arbiter disabled.\n",strap);
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return 0;
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}
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return 1;
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}
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#endif /* defined(CONFIG_PCI) */
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/*************************************************************************
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* pci_target_init
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*
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* The bootstrap configuration provides default settings for the pci
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* inbound map (PIM). But the bootstrap config choices are limited and
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* may not be sufficient for a given board.
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*
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************************************************************************/
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#if defined(CONFIG_PCI) && defined(CFG_PCI_TARGET_INIT)
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void pci_target_init(struct pci_controller *hose)
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{
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/*--------------------------------------------------------------------------+
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* Disable everything
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*--------------------------------------------------------------------------*/
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out32r( PCIX0_PIM0SA, 0 ); /* disable */
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out32r( PCIX0_PIM1SA, 0 ); /* disable */
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out32r( PCIX0_PIM2SA, 0 ); /* disable */
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out32r( PCIX0_EROMBA, 0 ); /* disable expansion rom */
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/*--------------------------------------------------------------------------+
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* Map all of SDRAM to PCI address 0x0000_0000. Note that the 440 strapping
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* options to not support sizes such as 128/256 MB.
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*--------------------------------------------------------------------------*/
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out32r( PCIX0_PIM0LAL, CFG_SDRAM_BASE );
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out32r( PCIX0_PIM0LAH, 0 );
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out32r( PCIX0_PIM0SA, ~(gd->ram_size - 1) | 1 );
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out32r( PCIX0_BAR0, 0 );
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/*--------------------------------------------------------------------------+
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* Program the board's subsystem id/vendor id
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*--------------------------------------------------------------------------*/
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out16r( PCIX0_SBSYSVID, CFG_PCI_SUBSYS_VENDORID );
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out16r( PCIX0_SBSYSID, CFG_PCI_SUBSYS_DEVICEID );
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out16r( PCIX0_CMD, in16r(PCIX0_CMD) | PCI_COMMAND_MEMORY );
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}
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#endif /* defined(CONFIG_PCI) && defined(CFG_PCI_TARGET_INIT) */
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/*************************************************************************
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* is_pci_host
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*
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* This routine is called to determine if a pci scan should be
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* performed. With various hardware environments (especially cPCI and
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* PPMC) it's insufficient to depend on the state of the arbiter enable
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* bit in the strap register, or generic host/adapter assumptions.
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*
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* Rather than hard-code a bad assumption in the general 440 code, the
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* 440 pci code requires the board to decide at runtime.
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*
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* Return 0 for adapter mode, non-zero for host (monarch) mode.
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*
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*
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************************************************************************/
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#if defined(CONFIG_PCI)
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int is_pci_host(struct pci_controller *hose)
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{
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return 1;
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}
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#endif /* defined(CONFIG_PCI) */
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/*************************************************************************
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* hw_watchdog_reset
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*
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* This routine is called to reset (keep alive) the watchdog timer
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*
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************************************************************************/
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#if defined(CONFIG_HW_WATCHDOG)
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void hw_watchdog_reset(void)
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{
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}
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#endif
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/*************************************************************************
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* int on_off()
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*
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************************************************************************/
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static int on_off( const char *s )
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{
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if (strcmp(s, "on") == 0) {
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return 1;
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} else if (strcmp(s, "off") == 0) {
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return 0;
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}
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return -1;
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}
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/*************************************************************************
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* void l2cache_disable()
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*
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************************************************************************/
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static void l2cache_disable(void)
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{
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mtdcr( l2_cache_cfg, 0 );
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}
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/*************************************************************************
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* void l2cache_enable()
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*
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************************************************************************/
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static void l2cache_enable(void) /* see p258 7.4.1 Enabling L2 Cache */
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{
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mtdcr( l2_cache_cfg, 0x80000000 ); /* enable L2_MODE L2_CFG[L2M] */
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mtdcr( l2_cache_addr, 0 ); /* set L2_ADDR with all zeros */
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mtdcr( l2_cache_cmd, 0x80000000 ); /* issue HCLEAR command via L2_CMD */
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while (!(mfdcr( l2_cache_stat ) & 0x80000000 )) ;; /* poll L2_SR for completion */
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mtdcr( l2_cache_cmd, 0x10000000 ); /* clear cache errors L2_CMD[CCP] */
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mtdcr( l2_cache_cmd, 0x08000000 ); /* clear tag errors L2_CMD[CTE] */
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mtdcr( l2_cache_snp0, 0 ); /* snoop registers */
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mtdcr( l2_cache_snp1, 0 );
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__asm__ volatile ("sync"); /* msync */
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mtdcr( l2_cache_cfg, 0xe0000000 ); /* inst and data use L2 */
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__asm__ volatile ("sync");
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}
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/*************************************************************************
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* int l2cache_status()
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*
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************************************************************************/
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static int l2cache_status(void)
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{
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return (mfdcr( l2_cache_cfg ) & 0x60000000) != 0;
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}
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/*************************************************************************
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* int do_l2cache()
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*
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************************************************************************/
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int do_l2cache( cmd_tbl_t *cmdtp, int flag, int argc, char *argv[] )
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{
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switch (argc) {
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case 2: /* on / off */
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switch (on_off(argv[1])) {
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case 0: l2cache_disable();
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break;
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case 1: l2cache_enable();
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break;
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}
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/* FALL TROUGH */
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case 1: /* get status */
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printf ("L2 Cache is %s\n",
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l2cache_status() ? "ON" : "OFF");
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return 0;
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default:
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printf ("Usage:\n%s\n", cmdtp->usage);
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return 1;
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}
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return 0;
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}
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U_BOOT_CMD(
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l2cache, 2, 1, do_l2cache,
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"l2cache - enable or disable L2 cache\n",
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"[on, off]\n"
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" - enable or disable L2 cache\n"
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);
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