Commit 2a706919 authored by Stefan Roese's avatar Stefan Roese Committed by Josh Boyer

[POWERPC] 4xx: Add PPC4xx L2-cache support (440GX)

This patch adds support for the 256k L2 cache found on some IBM/AMCC
4xx PPC's. It introduces a common 4xx SoC file (sysdev/ppc4xx_soc.c)
which currently "only" adds the L2 cache init code. Other common 4xx
stuff can be added later here.

The L2 cache handling code is a copy of Eugene's code in arch/ppc
with small modifications.

Tested on AMCC Taishan 440GX.
Signed-off-by: default avatarStefan Roese <sr@denx.de>
Signed-off-by: default avatarJosh Boyer <jwboyer@linux.vnet.ibm.com>
parent 145692a7
......@@ -501,6 +501,9 @@ config FSL_PCI
bool
select PPC_INDIRECT_PCI
config 4xx_SOC
bool
# Yes MCA RS/6000s exist but Linux-PPC does not currently support any
config MCA
bool
......
......@@ -129,6 +129,7 @@ config 440GP
config 440GX
bool
select 4xx_SOC
select IBM_NEW_EMAC_EMAC4
select IBM_NEW_EMAC_RGMII
select IBM_NEW_EMAC_ZMII #test only
......
......@@ -27,6 +27,7 @@ obj-$(CONFIG_PPC_INDIRECT_PCI) += indirect_pci.o
obj-$(CONFIG_PPC_I8259) += i8259.o
obj-$(CONFIG_IPIC) += ipic.o
obj-$(CONFIG_4xx) += uic.o
obj-$(CONFIG_4xx_SOC) += ppc4xx_soc.o
obj-$(CONFIG_XILINX_VIRTEX) += xilinx_intc.o
obj-$(CONFIG_OF_RTC) += of_rtc.o
ifeq ($(CONFIG_PCI),y)
......
/*
* IBM/AMCC PPC4xx SoC setup code
*
* Copyright 2008 DENX Software Engineering, Stefan Roese <sr@denx.de>
*
* L2 cache routines cloned from arch/ppc/syslib/ibm440gx_common.c which is:
* Eugene Surovegin <eugene.surovegin@zultys.com> or <ebs@ebshome.net>
* Copyright (c) 2003 - 2006 Zultys Technologies
*
* 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/stddef.h>
#include <linux/kernel.h>
#include <linux/init.h>
#include <linux/errno.h>
#include <linux/interrupt.h>
#include <linux/irq.h>
#include <linux/of_platform.h>
#include <asm/dcr.h>
#include <asm/dcr-regs.h>
static u32 dcrbase_l2c;
/*
* L2-cache
*/
/* Issue L2C diagnostic command */
static inline u32 l2c_diag(u32 addr)
{
mtdcr(dcrbase_l2c + DCRN_L2C0_ADDR, addr);
mtdcr(dcrbase_l2c + DCRN_L2C0_CMD, L2C_CMD_DIAG);
while (!(mfdcr(dcrbase_l2c + DCRN_L2C0_SR) & L2C_SR_CC))
;
return mfdcr(dcrbase_l2c + DCRN_L2C0_DATA);
}
static irqreturn_t l2c_error_handler(int irq, void *dev)
{
u32 sr = mfdcr(dcrbase_l2c + DCRN_L2C0_SR);
if (sr & L2C_SR_CPE) {
/* Read cache trapped address */
u32 addr = l2c_diag(0x42000000);
printk(KERN_EMERG "L2C: Cache Parity Error, addr[16:26] = 0x%08x\n",
addr);
}
if (sr & L2C_SR_TPE) {
/* Read tag trapped address */
u32 addr = l2c_diag(0x82000000) >> 16;
printk(KERN_EMERG "L2C: Tag Parity Error, addr[16:26] = 0x%08x\n",
addr);
}
/* Clear parity errors */
if (sr & (L2C_SR_CPE | L2C_SR_TPE)){
mtdcr(dcrbase_l2c + DCRN_L2C0_ADDR, 0);
mtdcr(dcrbase_l2c + DCRN_L2C0_CMD, L2C_CMD_CCP | L2C_CMD_CTE);
} else {
printk(KERN_EMERG "L2C: LRU error\n");
}
return IRQ_HANDLED;
}
static int __init ppc4xx_l2c_probe(void)
{
struct device_node *np;
u32 r;
unsigned long flags;
int irq;
const u32 *dcrreg;
u32 dcrbase_isram;
int len;
const u32 *prop;
u32 l2_size;
np = of_find_compatible_node(NULL, NULL, "ibm,l2-cache");
if (!np)
return 0;
/* Get l2 cache size */
prop = of_get_property(np, "cache-size", NULL);
if (prop == NULL) {
printk(KERN_ERR "%s: Can't get cache-size!\n", np->full_name);
of_node_put(np);
return -ENODEV;
}
l2_size = prop[0];
/* Map DCRs */
dcrreg = of_get_property(np, "dcr-reg", &len);
if (!dcrreg || (len != 4 * sizeof(u32))) {
printk(KERN_ERR "%s: Can't get DCR register base !",
np->full_name);
of_node_put(np);
return -ENODEV;
}
dcrbase_isram = dcrreg[0];
dcrbase_l2c = dcrreg[2];
/* Get and map irq number from device tree */
irq = irq_of_parse_and_map(np, 0);
if (irq == NO_IRQ) {
printk(KERN_ERR "irq_of_parse_and_map failed\n");
of_node_put(np);
return -ENODEV;
}
/* Install error handler */
if (request_irq(irq, l2c_error_handler, IRQF_DISABLED, "L2C", 0) < 0) {
printk(KERN_ERR "Cannot install L2C error handler"
", cache is not enabled\n");
of_node_put(np);
return -ENODEV;
}
local_irq_save(flags);
asm volatile ("sync" ::: "memory");
/* Disable SRAM */
mtdcr(dcrbase_isram + DCRN_SRAM0_DPC,
mfdcr(dcrbase_isram + DCRN_SRAM0_DPC) & ~SRAM_DPC_ENABLE);
mtdcr(dcrbase_isram + DCRN_SRAM0_SB0CR,
mfdcr(dcrbase_isram + DCRN_SRAM0_SB0CR) & ~SRAM_SBCR_BU_MASK);
mtdcr(dcrbase_isram + DCRN_SRAM0_SB1CR,
mfdcr(dcrbase_isram + DCRN_SRAM0_SB1CR) & ~SRAM_SBCR_BU_MASK);
mtdcr(dcrbase_isram + DCRN_SRAM0_SB2CR,
mfdcr(dcrbase_isram + DCRN_SRAM0_SB2CR) & ~SRAM_SBCR_BU_MASK);
mtdcr(dcrbase_isram + DCRN_SRAM0_SB3CR,
mfdcr(dcrbase_isram + DCRN_SRAM0_SB3CR) & ~SRAM_SBCR_BU_MASK);
/* Enable L2_MODE without ICU/DCU */
r = mfdcr(dcrbase_l2c + DCRN_L2C0_CFG) &
~(L2C_CFG_ICU | L2C_CFG_DCU | L2C_CFG_SS_MASK);
r |= L2C_CFG_L2M | L2C_CFG_SS_256;
mtdcr(dcrbase_l2c + DCRN_L2C0_CFG, r);
mtdcr(dcrbase_l2c + DCRN_L2C0_ADDR, 0);
/* Hardware Clear Command */
mtdcr(dcrbase_l2c + DCRN_L2C0_CMD, L2C_CMD_HCC);
while (!(mfdcr(dcrbase_l2c + DCRN_L2C0_SR) & L2C_SR_CC))
;
/* Clear Cache Parity and Tag Errors */
mtdcr(dcrbase_l2c + DCRN_L2C0_CMD, L2C_CMD_CCP | L2C_CMD_CTE);
/* Enable 64G snoop region starting at 0 */
r = mfdcr(dcrbase_l2c + DCRN_L2C0_SNP0) &
~(L2C_SNP_BA_MASK | L2C_SNP_SSR_MASK);
r |= L2C_SNP_SSR_32G | L2C_SNP_ESR;
mtdcr(dcrbase_l2c + DCRN_L2C0_SNP0, r);
r = mfdcr(dcrbase_l2c + DCRN_L2C0_SNP1) &
~(L2C_SNP_BA_MASK | L2C_SNP_SSR_MASK);
r |= 0x80000000 | L2C_SNP_SSR_32G | L2C_SNP_ESR;
mtdcr(dcrbase_l2c + DCRN_L2C0_SNP1, r);
asm volatile ("sync" ::: "memory");
/* Enable ICU/DCU ports */
r = mfdcr(dcrbase_l2c + DCRN_L2C0_CFG);
r &= ~(L2C_CFG_DCW_MASK | L2C_CFG_PMUX_MASK | L2C_CFG_PMIM
| L2C_CFG_TPEI | L2C_CFG_CPEI | L2C_CFG_NAM | L2C_CFG_NBRM);
r |= L2C_CFG_ICU | L2C_CFG_DCU | L2C_CFG_TPC | L2C_CFG_CPC | L2C_CFG_FRAN
| L2C_CFG_CPIM | L2C_CFG_TPIM | L2C_CFG_LIM | L2C_CFG_SMCM;
/* Check for 460EX/GT special handling */
if (of_device_is_compatible(np, "ibm,l2-cache-460ex"))
r |= L2C_CFG_RDBW;
mtdcr(dcrbase_l2c + DCRN_L2C0_CFG, r);
asm volatile ("sync; isync" ::: "memory");
local_irq_restore(flags);
printk(KERN_INFO "%dk L2-cache enabled\n", l2_size >> 10);
of_node_put(np);
return 0;
}
arch_initcall(ppc4xx_l2c_probe);
......@@ -68,4 +68,82 @@
#define SDR0_UART3 0x0123
#define SDR0_CUST0 0x4000
/*
* All those DCR register addresses are offsets from the base address
* for the SRAM0 controller (e.g. 0x20 on 440GX). The base address is
* excluded here and configured in the device tree.
*/
#define DCRN_SRAM0_SB0CR 0x00
#define DCRN_SRAM0_SB1CR 0x01
#define DCRN_SRAM0_SB2CR 0x02
#define DCRN_SRAM0_SB3CR 0x03
#define SRAM_SBCR_BU_MASK 0x00000180
#define SRAM_SBCR_BS_64KB 0x00000800
#define SRAM_SBCR_BU_RO 0x00000080
#define SRAM_SBCR_BU_RW 0x00000180
#define DCRN_SRAM0_BEAR 0x04
#define DCRN_SRAM0_BESR0 0x05
#define DCRN_SRAM0_BESR1 0x06
#define DCRN_SRAM0_PMEG 0x07
#define DCRN_SRAM0_CID 0x08
#define DCRN_SRAM0_REVID 0x09
#define DCRN_SRAM0_DPC 0x0a
#define SRAM_DPC_ENABLE 0x80000000
/*
* All those DCR register addresses are offsets from the base address
* for the SRAM0 controller (e.g. 0x30 on 440GX). The base address is
* excluded here and configured in the device tree.
*/
#define DCRN_L2C0_CFG 0x00
#define L2C_CFG_L2M 0x80000000
#define L2C_CFG_ICU 0x40000000
#define L2C_CFG_DCU 0x20000000
#define L2C_CFG_DCW_MASK 0x1e000000
#define L2C_CFG_TPC 0x01000000
#define L2C_CFG_CPC 0x00800000
#define L2C_CFG_FRAN 0x00200000
#define L2C_CFG_SS_MASK 0x00180000
#define L2C_CFG_SS_256 0x00000000
#define L2C_CFG_CPIM 0x00040000
#define L2C_CFG_TPIM 0x00020000
#define L2C_CFG_LIM 0x00010000
#define L2C_CFG_PMUX_MASK 0x00007000
#define L2C_CFG_PMUX_SNP 0x00000000
#define L2C_CFG_PMUX_IF 0x00001000
#define L2C_CFG_PMUX_DF 0x00002000
#define L2C_CFG_PMUX_DS 0x00003000
#define L2C_CFG_PMIM 0x00000800
#define L2C_CFG_TPEI 0x00000400
#define L2C_CFG_CPEI 0x00000200
#define L2C_CFG_NAM 0x00000100
#define L2C_CFG_SMCM 0x00000080
#define L2C_CFG_NBRM 0x00000040
#define L2C_CFG_RDBW 0x00000008 /* only 460EX/GT */
#define DCRN_L2C0_CMD 0x01
#define L2C_CMD_CLR 0x80000000
#define L2C_CMD_DIAG 0x40000000
#define L2C_CMD_INV 0x20000000
#define L2C_CMD_CCP 0x10000000
#define L2C_CMD_CTE 0x08000000
#define L2C_CMD_STRC 0x04000000
#define L2C_CMD_STPC 0x02000000
#define L2C_CMD_RPMC 0x01000000
#define L2C_CMD_HCC 0x00800000
#define DCRN_L2C0_ADDR 0x02
#define DCRN_L2C0_DATA 0x03
#define DCRN_L2C0_SR 0x04
#define L2C_SR_CC 0x80000000
#define L2C_SR_CPE 0x40000000
#define L2C_SR_TPE 0x20000000
#define L2C_SR_LRU 0x10000000
#define L2C_SR_PCS 0x08000000
#define DCRN_L2C0_REVID 0x05
#define DCRN_L2C0_SNP0 0x06
#define DCRN_L2C0_SNP1 0x07
#define L2C_SNP_BA_MASK 0xffff0000
#define L2C_SNP_SSR_MASK 0x0000f000
#define L2C_SNP_SSR_32G 0x0000f000
#define L2C_SNP_ESR 0x00000800
#endif /* __DCR_REGS_H__ */
Markdown is supported
0%
or
You are about to add 0 people to the discussion. Proceed with caution.
Finish editing this message first!
Please register or to comment