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linux/drivers/edac/cpc925_edac.c
Dmitry Eremin-Solenikov ce39508883 cpc925_edac: Support single-processor configurations 
If second CPU is not enabled, CPC925 EDAC driver will spill out warnings
about errors on second Processor Interface. Support masking that out,
by detecting at runtime which CPUs are present in device tree.

Signed-off-by: Dmitry Eremin-Solenikov <dbaryshkov@gmail.com>
Cc: Harry Ciao <qingtao.cao@windriver.com>
Cc: Doug Thompson <dougthompson@xmission.com>
Signed-off-by: Dmitry Eremin-Solenikov <dbaryshkov@gmail.com>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
2011-09-01 16:00:18 +10:00

1081 lines
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Raw Blame History

/*
* cpc925_edac.c, EDAC driver for IBM CPC925 Bridge and Memory Controller.
*
* Copyright (c) 2008 Wind River Systems, Inc.
*
* Authors: Cao Qingtao <qingtao.cao@windriver.com>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*
* 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 <linux/module.h>
#include <linux/init.h>
#include <linux/io.h>
#include <linux/edac.h>
#include <linux/of.h>
#include <linux/platform_device.h>
#include <linux/gfp.h>
#include "edac_core.h"
#include "edac_module.h"
#define CPC925_EDAC_REVISION " Ver: 1.0.0"
#define CPC925_EDAC_MOD_STR "cpc925_edac"
#define cpc925_printk(level, fmt, arg...) \
edac_printk(level, "CPC925", fmt, ##arg)
#define cpc925_mc_printk(mci, level, fmt, arg...) \
edac_mc_chipset_printk(mci, level, "CPC925", fmt, ##arg)
/*
* CPC925 registers are of 32 bits with bit0 defined at the
* most significant bit and bit31 at that of least significant.
*/
#define CPC925_BITS_PER_REG 32
#define CPC925_BIT(nr) (1UL << (CPC925_BITS_PER_REG - 1 - nr))
/*
* EDAC device names for the error detections of
* CPU Interface and Hypertransport Link.
*/
#define CPC925_CPU_ERR_DEV "cpu"
#define CPC925_HT_LINK_DEV "htlink"
/* Suppose DDR Refresh cycle is 15.6 microsecond */
#define CPC925_REF_FREQ 0xFA69
#define CPC925_SCRUB_BLOCK_SIZE 64 /* bytes */
#define CPC925_NR_CSROWS 8
/*
* All registers and bits definitions are taken from
* "CPC925 Bridge and Memory Controller User Manual, SA14-2761-02".
*/
/*
* CPU and Memory Controller Registers
*/
/************************************************************
* Processor Interface Exception Mask Register (APIMASK)
************************************************************/
#define REG_APIMASK_OFFSET 0x30070
enum apimask_bits {
APIMASK_DART = CPC925_BIT(0), /* DART Exception */
APIMASK_ADI0 = CPC925_BIT(1), /* Handshake Error on PI0_ADI */
APIMASK_ADI1 = CPC925_BIT(2), /* Handshake Error on PI1_ADI */
APIMASK_STAT = CPC925_BIT(3), /* Status Exception */
APIMASK_DERR = CPC925_BIT(4), /* Data Error Exception */
APIMASK_ADRS0 = CPC925_BIT(5), /* Addressing Exception on PI0 */
APIMASK_ADRS1 = CPC925_BIT(6), /* Addressing Exception on PI1 */
/* BIT(7) Reserved */
APIMASK_ECC_UE_H = CPC925_BIT(8), /* UECC upper */
APIMASK_ECC_CE_H = CPC925_BIT(9), /* CECC upper */
APIMASK_ECC_UE_L = CPC925_BIT(10), /* UECC lower */
APIMASK_ECC_CE_L = CPC925_BIT(11), /* CECC lower */
CPU_MASK_ENABLE = (APIMASK_DART | APIMASK_ADI0 | APIMASK_ADI1 |
APIMASK_STAT | APIMASK_DERR | APIMASK_ADRS0 |
APIMASK_ADRS1),
ECC_MASK_ENABLE = (APIMASK_ECC_UE_H | APIMASK_ECC_CE_H |
APIMASK_ECC_UE_L | APIMASK_ECC_CE_L),
};
#define APIMASK_ADI(n) CPC925_BIT(((n)+1))
/************************************************************
* Processor Interface Exception Register (APIEXCP)
************************************************************/
#define REG_APIEXCP_OFFSET 0x30060
enum apiexcp_bits {
APIEXCP_DART = CPC925_BIT(0), /* DART Exception */
APIEXCP_ADI0 = CPC925_BIT(1), /* Handshake Error on PI0_ADI */
APIEXCP_ADI1 = CPC925_BIT(2), /* Handshake Error on PI1_ADI */
APIEXCP_STAT = CPC925_BIT(3), /* Status Exception */
APIEXCP_DERR = CPC925_BIT(4), /* Data Error Exception */
APIEXCP_ADRS0 = CPC925_BIT(5), /* Addressing Exception on PI0 */
APIEXCP_ADRS1 = CPC925_BIT(6), /* Addressing Exception on PI1 */
/* BIT(7) Reserved */
APIEXCP_ECC_UE_H = CPC925_BIT(8), /* UECC upper */
APIEXCP_ECC_CE_H = CPC925_BIT(9), /* CECC upper */
APIEXCP_ECC_UE_L = CPC925_BIT(10), /* UECC lower */
APIEXCP_ECC_CE_L = CPC925_BIT(11), /* CECC lower */
CPU_EXCP_DETECTED = (APIEXCP_DART | APIEXCP_ADI0 | APIEXCP_ADI1 |
APIEXCP_STAT | APIEXCP_DERR | APIEXCP_ADRS0 |
APIEXCP_ADRS1),
UECC_EXCP_DETECTED = (APIEXCP_ECC_UE_H | APIEXCP_ECC_UE_L),
CECC_EXCP_DETECTED = (APIEXCP_ECC_CE_H | APIEXCP_ECC_CE_L),
ECC_EXCP_DETECTED = (UECC_EXCP_DETECTED | CECC_EXCP_DETECTED),
};
/************************************************************
* Memory Bus Configuration Register (MBCR)
************************************************************/
#define REG_MBCR_OFFSET 0x2190
#define MBCR_64BITCFG_SHIFT 23
#define MBCR_64BITCFG_MASK (1UL << MBCR_64BITCFG_SHIFT)
#define MBCR_64BITBUS_SHIFT 22
#define MBCR_64BITBUS_MASK (1UL << MBCR_64BITBUS_SHIFT)
/************************************************************
* Memory Bank Mode Register (MBMR)
************************************************************/
#define REG_MBMR_OFFSET 0x21C0
#define MBMR_MODE_MAX_VALUE 0xF
#define MBMR_MODE_SHIFT 25
#define MBMR_MODE_MASK (MBMR_MODE_MAX_VALUE << MBMR_MODE_SHIFT)
#define MBMR_BBA_SHIFT 24
#define MBMR_BBA_MASK (1UL << MBMR_BBA_SHIFT)
/************************************************************
* Memory Bank Boundary Address Register (MBBAR)
************************************************************/
#define REG_MBBAR_OFFSET 0x21D0
#define MBBAR_BBA_MAX_VALUE 0xFF
#define MBBAR_BBA_SHIFT 24
#define MBBAR_BBA_MASK (MBBAR_BBA_MAX_VALUE << MBBAR_BBA_SHIFT)
/************************************************************
* Memory Scrub Control Register (MSCR)
************************************************************/
#define REG_MSCR_OFFSET 0x2400
#define MSCR_SCRUB_MOD_MASK 0xC0000000 /* scrub_mod - bit0:1*/
#define MSCR_BACKGR_SCRUB 0x40000000 /* 01 */
#define MSCR_SI_SHIFT 16 /* si - bit8:15*/
#define MSCR_SI_MAX_VALUE 0xFF
#define MSCR_SI_MASK (MSCR_SI_MAX_VALUE << MSCR_SI_SHIFT)
/************************************************************
* Memory Scrub Range Start Register (MSRSR)
************************************************************/
#define REG_MSRSR_OFFSET 0x2410
/************************************************************
* Memory Scrub Range End Register (MSRER)
************************************************************/
#define REG_MSRER_OFFSET 0x2420
/************************************************************
* Memory Scrub Pattern Register (MSPR)
************************************************************/
#define REG_MSPR_OFFSET 0x2430
/************************************************************
* Memory Check Control Register (MCCR)
************************************************************/
#define REG_MCCR_OFFSET 0x2440
enum mccr_bits {
MCCR_ECC_EN = CPC925_BIT(0), /* ECC high and low check */
};
/************************************************************
* Memory Check Range End Register (MCRER)
************************************************************/
#define REG_MCRER_OFFSET 0x2450
/************************************************************
* Memory Error Address Register (MEAR)
************************************************************/
#define REG_MEAR_OFFSET 0x2460
#define MEAR_BCNT_MAX_VALUE 0x3
#define MEAR_BCNT_SHIFT 30
#define MEAR_BCNT_MASK (MEAR_BCNT_MAX_VALUE << MEAR_BCNT_SHIFT)
#define MEAR_RANK_MAX_VALUE 0x7
#define MEAR_RANK_SHIFT 27
#define MEAR_RANK_MASK (MEAR_RANK_MAX_VALUE << MEAR_RANK_SHIFT)
#define MEAR_COL_MAX_VALUE 0x7FF
#define MEAR_COL_SHIFT 16
#define MEAR_COL_MASK (MEAR_COL_MAX_VALUE << MEAR_COL_SHIFT)
#define MEAR_BANK_MAX_VALUE 0x3
#define MEAR_BANK_SHIFT 14
#define MEAR_BANK_MASK (MEAR_BANK_MAX_VALUE << MEAR_BANK_SHIFT)
#define MEAR_ROW_MASK 0x00003FFF
/************************************************************
* Memory Error Syndrome Register (MESR)
************************************************************/
#define REG_MESR_OFFSET 0x2470
#define MESR_ECC_SYN_H_MASK 0xFF00
#define MESR_ECC_SYN_L_MASK 0x00FF
/************************************************************
* Memory Mode Control Register (MMCR)
************************************************************/
#define REG_MMCR_OFFSET 0x2500
enum mmcr_bits {
MMCR_REG_DIMM_MODE = CPC925_BIT(3),
};
/*
* HyperTransport Link Registers
*/
/************************************************************
* Error Handling/Enumeration Scratch Pad Register (ERRCTRL)
************************************************************/
#define REG_ERRCTRL_OFFSET 0x70140
enum errctrl_bits { /* nonfatal interrupts for */
ERRCTRL_SERR_NF = CPC925_BIT(0), /* system error */
ERRCTRL_CRC_NF = CPC925_BIT(1), /* CRC error */
ERRCTRL_RSP_NF = CPC925_BIT(2), /* Response error */
ERRCTRL_EOC_NF = CPC925_BIT(3), /* End-Of-Chain error */
ERRCTRL_OVF_NF = CPC925_BIT(4), /* Overflow error */
ERRCTRL_PROT_NF = CPC925_BIT(5), /* Protocol error */
ERRCTRL_RSP_ERR = CPC925_BIT(6), /* Response error received */
ERRCTRL_CHN_FAL = CPC925_BIT(7), /* Sync flooding detected */
HT_ERRCTRL_ENABLE = (ERRCTRL_SERR_NF | ERRCTRL_CRC_NF |
ERRCTRL_RSP_NF | ERRCTRL_EOC_NF |
ERRCTRL_OVF_NF | ERRCTRL_PROT_NF),
HT_ERRCTRL_DETECTED = (ERRCTRL_RSP_ERR | ERRCTRL_CHN_FAL),
};
/************************************************************
* Link Configuration and Link Control Register (LINKCTRL)
************************************************************/
#define REG_LINKCTRL_OFFSET 0x70110
enum linkctrl_bits {
LINKCTRL_CRC_ERR = (CPC925_BIT(22) | CPC925_BIT(23)),
LINKCTRL_LINK_FAIL = CPC925_BIT(27),
HT_LINKCTRL_DETECTED = (LINKCTRL_CRC_ERR | LINKCTRL_LINK_FAIL),
};
/************************************************************
* Link FreqCap/Error/Freq/Revision ID Register (LINKERR)
************************************************************/
#define REG_LINKERR_OFFSET 0x70120
enum linkerr_bits {
LINKERR_EOC_ERR = CPC925_BIT(17), /* End-Of-Chain error */
LINKERR_OVF_ERR = CPC925_BIT(18), /* Receive Buffer Overflow */
LINKERR_PROT_ERR = CPC925_BIT(19), /* Protocol error */
HT_LINKERR_DETECTED = (LINKERR_EOC_ERR | LINKERR_OVF_ERR |
LINKERR_PROT_ERR),
};
/************************************************************
* Bridge Control Register (BRGCTRL)
************************************************************/
#define REG_BRGCTRL_OFFSET 0x70300
enum brgctrl_bits {
BRGCTRL_DETSERR = CPC925_BIT(0), /* SERR on Secondary Bus */
BRGCTRL_SECBUSRESET = CPC925_BIT(9), /* Secondary Bus Reset */
};
/* Private structure for edac memory controller */
struct cpc925_mc_pdata {
void __iomem *vbase;
unsigned long total_mem;
const char *name;
int edac_idx;
};
/* Private structure for common edac device */
struct cpc925_dev_info {
void __iomem *vbase;
struct platform_device *pdev;
char *ctl_name;
int edac_idx;
struct edac_device_ctl_info *edac_dev;
void (*init)(struct cpc925_dev_info *dev_info);
void (*exit)(struct cpc925_dev_info *dev_info);
void (*check)(struct edac_device_ctl_info *edac_dev);
};
/* Get total memory size from Open Firmware DTB */
static void get_total_mem(struct cpc925_mc_pdata *pdata)
{
struct device_node *np = NULL;
const unsigned int *reg, *reg_end;
int len, sw, aw;
unsigned long start, size;
np = of_find_node_by_type(NULL, "memory");
if (!np)
return;
aw = of_n_addr_cells(np);
sw = of_n_size_cells(np);
reg = (const unsigned int *)of_get_property(np, "reg", &len);
reg_end = reg + len/4;
pdata->total_mem = 0;
do {
start = of_read_number(reg, aw);
reg += aw;
size = of_read_number(reg, sw);
reg += sw;
debugf1("%s: start 0x%lx, size 0x%lx\n", __func__,
start, size);
pdata->total_mem += size;
} while (reg < reg_end);
of_node_put(np);
debugf0("%s: total_mem 0x%lx\n", __func__, pdata->total_mem);
}
static void cpc925_init_csrows(struct mem_ctl_info *mci)
{
struct cpc925_mc_pdata *pdata = mci->pvt_info;
struct csrow_info *csrow;
int index;
u32 mbmr, mbbar, bba;
unsigned long row_size, last_nr_pages = 0;
get_total_mem(pdata);
for (index = 0; index < mci->nr_csrows; index++) {
mbmr = __raw_readl(pdata->vbase + REG_MBMR_OFFSET +
0x20 * index);
mbbar = __raw_readl(pdata->vbase + REG_MBBAR_OFFSET +
0x20 + index);
bba = (((mbmr & MBMR_BBA_MASK) >> MBMR_BBA_SHIFT) << 8) |
((mbbar & MBBAR_BBA_MASK) >> MBBAR_BBA_SHIFT);
if (bba == 0)
continue; /* not populated */
csrow = &mci->csrows[index];
row_size = bba * (1UL << 28); /* 256M */
csrow->first_page = last_nr_pages;
csrow->nr_pages = row_size >> PAGE_SHIFT;
csrow->last_page = csrow->first_page + csrow->nr_pages - 1;
last_nr_pages = csrow->last_page + 1;
csrow->mtype = MEM_RDDR;
csrow->edac_mode = EDAC_SECDED;
switch (csrow->nr_channels) {
case 1: /* Single channel */
csrow->grain = 32; /* four-beat burst of 32 bytes */
break;
case 2: /* Dual channel */
default:
csrow->grain = 64; /* four-beat burst of 64 bytes */
break;
}
switch ((mbmr & MBMR_MODE_MASK) >> MBMR_MODE_SHIFT) {
case 6: /* 0110, no way to differentiate X8 VS X16 */
case 5: /* 0101 */
case 8: /* 1000 */
csrow->dtype = DEV_X16;
break;
case 7: /* 0111 */
case 9: /* 1001 */
csrow->dtype = DEV_X8;
break;
default:
csrow->dtype = DEV_UNKNOWN;
break;
}
}
}
/* Enable memory controller ECC detection */
static void cpc925_mc_init(struct mem_ctl_info *mci)
{
struct cpc925_mc_pdata *pdata = mci->pvt_info;
u32 apimask;
u32 mccr;
/* Enable various ECC error exceptions */
apimask = __raw_readl(pdata->vbase + REG_APIMASK_OFFSET);
if ((apimask & ECC_MASK_ENABLE) == 0) {
apimask |= ECC_MASK_ENABLE;
__raw_writel(apimask, pdata->vbase + REG_APIMASK_OFFSET);
}
/* Enable ECC detection */
mccr = __raw_readl(pdata->vbase + REG_MCCR_OFFSET);
if ((mccr & MCCR_ECC_EN) == 0) {
mccr |= MCCR_ECC_EN;
__raw_writel(mccr, pdata->vbase + REG_MCCR_OFFSET);
}
}
/* Disable memory controller ECC detection */
static void cpc925_mc_exit(struct mem_ctl_info *mci)
{
/*
* WARNING:
* We are supposed to clear the ECC error detection bits,
* and it will be no problem to do so. However, once they
* are cleared here if we want to re-install CPC925 EDAC
* module later, setting them up in cpc925_mc_init() will
* trigger machine check exception.
* Also, it's ok to leave ECC error detection bits enabled,
* since they are reset to 1 by default or by boot loader.
*/
return;
}
/*
* Revert DDR column/row/bank addresses into page frame number and
* offset in page.
*
* Suppose memory mode is 0x0111(128-bit mode, identical DIMM pairs),
* physical address(PA) bits to column address(CA) bits mappings are:
* CA 0 1 2 3 4 5 6 7 8 9 10
* PA 59 58 57 56 55 54 53 52 51 50 49
*
* physical address(PA) bits to bank address(BA) bits mappings are:
* BA 0 1
* PA 43 44
*
* physical address(PA) bits to row address(RA) bits mappings are:
* RA 0 1 2 3 4 5 6 7 8 9 10 11 12
* PA 36 35 34 48 47 46 45 40 41 42 39 38 37
*/
static void cpc925_mc_get_pfn(struct mem_ctl_info *mci, u32 mear,
unsigned long *pfn, unsigned long *offset, int *csrow)
{
u32 bcnt, rank, col, bank, row;
u32 c;
unsigned long pa;
int i;
bcnt = (mear & MEAR_BCNT_MASK) >> MEAR_BCNT_SHIFT;
rank = (mear & MEAR_RANK_MASK) >> MEAR_RANK_SHIFT;
col = (mear & MEAR_COL_MASK) >> MEAR_COL_SHIFT;
bank = (mear & MEAR_BANK_MASK) >> MEAR_BANK_SHIFT;
row = mear & MEAR_ROW_MASK;
*csrow = rank;
#ifdef CONFIG_EDAC_DEBUG
if (mci->csrows[rank].first_page == 0) {
cpc925_mc_printk(mci, KERN_ERR, "ECC occurs in a "
"non-populated csrow, broken hardware?\n");
return;
}
#endif
/* Revert csrow number */
pa = mci->csrows[rank].first_page << PAGE_SHIFT;
/* Revert column address */
col += bcnt;
for (i = 0; i < 11; i++) {
c = col & 0x1;
col >>= 1;
pa |= c << (14 - i);
}
/* Revert bank address */
pa |= bank << 19;
/* Revert row address, in 4 steps */
for (i = 0; i < 3; i++) {
c = row & 0x1;
row >>= 1;
pa |= c << (26 - i);
}
for (i = 0; i < 3; i++) {
c = row & 0x1;
row >>= 1;
pa |= c << (21 + i);
}
for (i = 0; i < 4; i++) {
c = row & 0x1;
row >>= 1;
pa |= c << (18 - i);
}
for (i = 0; i < 3; i++) {
c = row & 0x1;
row >>= 1;
pa |= c << (29 - i);
}
*offset = pa & (PAGE_SIZE - 1);
*pfn = pa >> PAGE_SHIFT;
debugf0("%s: ECC physical address 0x%lx\n", __func__, pa);
}
static int cpc925_mc_find_channel(struct mem_ctl_info *mci, u16 syndrome)
{
if ((syndrome & MESR_ECC_SYN_H_MASK) == 0)
return 0;
if ((syndrome & MESR_ECC_SYN_L_MASK) == 0)
return 1;
cpc925_mc_printk(mci, KERN_INFO, "Unexpected syndrome value: 0x%x\n",
syndrome);
return 1;
}
/* Check memory controller registers for ECC errors */
static void cpc925_mc_check(struct mem_ctl_info *mci)
{
struct cpc925_mc_pdata *pdata = mci->pvt_info;
u32 apiexcp;
u32 mear;
u32 mesr;
u16 syndrome;
unsigned long pfn = 0, offset = 0;
int csrow = 0, channel = 0;
/* APIEXCP is cleared when read */
apiexcp = __raw_readl(pdata->vbase + REG_APIEXCP_OFFSET);
if ((apiexcp & ECC_EXCP_DETECTED) == 0)
return;
mesr = __raw_readl(pdata->vbase + REG_MESR_OFFSET);
syndrome = mesr | (MESR_ECC_SYN_H_MASK | MESR_ECC_SYN_L_MASK);
mear = __raw_readl(pdata->vbase + REG_MEAR_OFFSET);
/* Revert column/row addresses into page frame number, etc */
cpc925_mc_get_pfn(mci, mear, &pfn, &offset, &csrow);
if (apiexcp & CECC_EXCP_DETECTED) {
cpc925_mc_printk(mci, KERN_INFO, "DRAM CECC Fault\n");
channel = cpc925_mc_find_channel(mci, syndrome);
edac_mc_handle_ce(mci, pfn, offset, syndrome,
csrow, channel, mci->ctl_name);
}
if (apiexcp & UECC_EXCP_DETECTED) {
cpc925_mc_printk(mci, KERN_INFO, "DRAM UECC Fault\n");
edac_mc_handle_ue(mci, pfn, offset, csrow, mci->ctl_name);
}
cpc925_mc_printk(mci, KERN_INFO, "Dump registers:\n");
cpc925_mc_printk(mci, KERN_INFO, "APIMASK 0x%08x\n",
__raw_readl(pdata->vbase + REG_APIMASK_OFFSET));
cpc925_mc_printk(mci, KERN_INFO, "APIEXCP 0x%08x\n",
apiexcp);
cpc925_mc_printk(mci, KERN_INFO, "Mem Scrub Ctrl 0x%08x\n",
__raw_readl(pdata->vbase + REG_MSCR_OFFSET));
cpc925_mc_printk(mci, KERN_INFO, "Mem Scrub Rge Start 0x%08x\n",
__raw_readl(pdata->vbase + REG_MSRSR_OFFSET));
cpc925_mc_printk(mci, KERN_INFO, "Mem Scrub Rge End 0x%08x\n",
__raw_readl(pdata->vbase + REG_MSRER_OFFSET));
cpc925_mc_printk(mci, KERN_INFO, "Mem Scrub Pattern 0x%08x\n",
__raw_readl(pdata->vbase + REG_MSPR_OFFSET));
cpc925_mc_printk(mci, KERN_INFO, "Mem Chk Ctrl 0x%08x\n",
__raw_readl(pdata->vbase + REG_MCCR_OFFSET));
cpc925_mc_printk(mci, KERN_INFO, "Mem Chk Rge End 0x%08x\n",
__raw_readl(pdata->vbase + REG_MCRER_OFFSET));
cpc925_mc_printk(mci, KERN_INFO, "Mem Err Address 0x%08x\n",
mesr);
cpc925_mc_printk(mci, KERN_INFO, "Mem Err Syndrome 0x%08x\n",
syndrome);
}
/******************** CPU err device********************************/
static u32 cpc925_cpu_mask_disabled(void)
{
struct device_node *cpus;
struct device_node *cpunode = NULL;
static u32 mask = 0;
/* use cached value if available */
if (mask != 0)
return mask;
mask = APIMASK_ADI0 | APIMASK_ADI1;
cpus = of_find_node_by_path("/cpus");
if (cpus == NULL) {
cpc925_printk(KERN_DEBUG, "No /cpus node !\n");
return 0;
}
while ((cpunode = of_get_next_child(cpus, cpunode)) != NULL) {
const u32 *reg = of_get_property(cpunode, "reg", NULL);
if (strcmp(cpunode->type, "cpu")) {
cpc925_printk(KERN_ERR, "Not a cpu node in /cpus: %s\n", cpunode->name);
continue;
}
if (reg == NULL || *reg > 2) {
cpc925_printk(KERN_ERR, "Bad reg value at %s\n", cpunode->full_name);
continue;
}
mask &= ~APIMASK_ADI(*reg);
}
if (mask != (APIMASK_ADI0 | APIMASK_ADI1)) {
/* We assume that each CPU sits on it's own PI and that
* for present CPUs the reg property equals to the PI
* interface id */
cpc925_printk(KERN_WARNING,
"Assuming PI id is equal to CPU MPIC id!\n");
}
of_node_put(cpunode);
of_node_put(cpus);
return mask;
}
/* Enable CPU Errors detection */
static void cpc925_cpu_init(struct cpc925_dev_info *dev_info)
{
u32 apimask;
u32 cpumask;
apimask = __raw_readl(dev_info->vbase + REG_APIMASK_OFFSET);
cpumask = cpc925_cpu_mask_disabled();
if (apimask & cpumask) {
cpc925_printk(KERN_WARNING, "CPU(s) not present, "
"but enabled in APIMASK, disabling\n");
apimask &= ~cpumask;
}
if ((apimask & CPU_MASK_ENABLE) == 0)
apimask |= CPU_MASK_ENABLE;
__raw_writel(apimask, dev_info->vbase + REG_APIMASK_OFFSET);
}
/* Disable CPU Errors detection */
static void cpc925_cpu_exit(struct cpc925_dev_info *dev_info)
{
/*
* WARNING:
* We are supposed to clear the CPU error detection bits,
* and it will be no problem to do so. However, once they
* are cleared here if we want to re-install CPC925 EDAC
* module later, setting them up in cpc925_cpu_init() will
* trigger machine check exception.
* Also, it's ok to leave CPU error detection bits enabled,
* since they are reset to 1 by default.
*/
return;
}
/* Check for CPU Errors */
static void cpc925_cpu_check(struct edac_device_ctl_info *edac_dev)
{
struct cpc925_dev_info *dev_info = edac_dev->pvt_info;
u32 apiexcp;
u32 apimask;
/* APIEXCP is cleared when read */
apiexcp = __raw_readl(dev_info->vbase + REG_APIEXCP_OFFSET);
if ((apiexcp & CPU_EXCP_DETECTED) == 0)
return;
if ((apiexcp & ~cpc925_cpu_mask_disabled()) == 0)
return;
apimask = __raw_readl(dev_info->vbase + REG_APIMASK_OFFSET);
cpc925_printk(KERN_INFO, "Processor Interface Fault\n"
"Processor Interface register dump:\n");
cpc925_printk(KERN_INFO, "APIMASK 0x%08x\n", apimask);
cpc925_printk(KERN_INFO, "APIEXCP 0x%08x\n", apiexcp);
edac_device_handle_ue(edac_dev, 0, 0, edac_dev->ctl_name);
}
/******************** HT Link err device****************************/
/* Enable HyperTransport Link Error detection */
static void cpc925_htlink_init(struct cpc925_dev_info *dev_info)
{
u32 ht_errctrl;
ht_errctrl = __raw_readl(dev_info->vbase + REG_ERRCTRL_OFFSET);
if ((ht_errctrl & HT_ERRCTRL_ENABLE) == 0) {
ht_errctrl |= HT_ERRCTRL_ENABLE;
__raw_writel(ht_errctrl, dev_info->vbase + REG_ERRCTRL_OFFSET);
}
}
/* Disable HyperTransport Link Error detection */
static void cpc925_htlink_exit(struct cpc925_dev_info *dev_info)
{
u32 ht_errctrl;
ht_errctrl = __raw_readl(dev_info->vbase + REG_ERRCTRL_OFFSET);
ht_errctrl &= ~HT_ERRCTRL_ENABLE;
__raw_writel(ht_errctrl, dev_info->vbase + REG_ERRCTRL_OFFSET);
}
/* Check for HyperTransport Link errors */
static void cpc925_htlink_check(struct edac_device_ctl_info *edac_dev)
{
struct cpc925_dev_info *dev_info = edac_dev->pvt_info;
u32 brgctrl = __raw_readl(dev_info->vbase + REG_BRGCTRL_OFFSET);
u32 linkctrl = __raw_readl(dev_info->vbase + REG_LINKCTRL_OFFSET);
u32 errctrl = __raw_readl(dev_info->vbase + REG_ERRCTRL_OFFSET);
u32 linkerr = __raw_readl(dev_info->vbase + REG_LINKERR_OFFSET);
if (!((brgctrl & BRGCTRL_DETSERR) ||
(linkctrl & HT_LINKCTRL_DETECTED) ||
(errctrl & HT_ERRCTRL_DETECTED) ||
(linkerr & HT_LINKERR_DETECTED)))
return;
cpc925_printk(KERN_INFO, "HT Link Fault\n"
"HT register dump:\n");
cpc925_printk(KERN_INFO, "Bridge Ctrl 0x%08x\n",
brgctrl);
cpc925_printk(KERN_INFO, "Link Config Ctrl 0x%08x\n",
linkctrl);
cpc925_printk(KERN_INFO, "Error Enum and Ctrl 0x%08x\n",
errctrl);
cpc925_printk(KERN_INFO, "Link Error 0x%08x\n",
linkerr);
/* Clear by write 1 */
if (brgctrl & BRGCTRL_DETSERR)
__raw_writel(BRGCTRL_DETSERR,
dev_info->vbase + REG_BRGCTRL_OFFSET);
if (linkctrl & HT_LINKCTRL_DETECTED)
__raw_writel(HT_LINKCTRL_DETECTED,
dev_info->vbase + REG_LINKCTRL_OFFSET);
/* Initiate Secondary Bus Reset to clear the chain failure */
if (errctrl & ERRCTRL_CHN_FAL)
__raw_writel(BRGCTRL_SECBUSRESET,
dev_info->vbase + REG_BRGCTRL_OFFSET);
if (errctrl & ERRCTRL_RSP_ERR)
__raw_writel(ERRCTRL_RSP_ERR,
dev_info->vbase + REG_ERRCTRL_OFFSET);
if (linkerr & HT_LINKERR_DETECTED)
__raw_writel(HT_LINKERR_DETECTED,
dev_info->vbase + REG_LINKERR_OFFSET);
edac_device_handle_ce(edac_dev, 0, 0, edac_dev->ctl_name);
}
static struct cpc925_dev_info cpc925_devs[] = {
{
.ctl_name = CPC925_CPU_ERR_DEV,
.init = cpc925_cpu_init,
.exit = cpc925_cpu_exit,
.check = cpc925_cpu_check,
},
{
.ctl_name = CPC925_HT_LINK_DEV,
.init = cpc925_htlink_init,
.exit = cpc925_htlink_exit,
.check = cpc925_htlink_check,
},
{0}, /* Terminated by NULL */
};
/*
* Add CPU Err detection and HyperTransport Link Err detection
* as common "edac_device", they have no corresponding device
* nodes in the Open Firmware DTB and we have to add platform
* devices for them. Also, they will share the MMIO with that
* of memory controller.
*/
static void cpc925_add_edac_devices(void __iomem *vbase)
{
struct cpc925_dev_info *dev_info;
if (!vbase) {
cpc925_printk(KERN_ERR, "MMIO not established yet\n");
return;
}
for (dev_info = &cpc925_devs[0]; dev_info->init; dev_info++) {
dev_info->vbase = vbase;
dev_info->pdev = platform_device_register_simple(
dev_info->ctl_name, 0, NULL, 0);
if (IS_ERR(dev_info->pdev)) {
cpc925_printk(KERN_ERR,
"Can't register platform device for %s\n",
dev_info->ctl_name);
continue;
}
/*
* Don't have to allocate private structure but
* make use of cpc925_devs[] instead.
*/
dev_info->edac_idx = edac_device_alloc_index();
dev_info->edac_dev =
edac_device_alloc_ctl_info(0, dev_info->ctl_name,
1, NULL, 0, 0, NULL, 0, dev_info->edac_idx);
if (!dev_info->edac_dev) {
cpc925_printk(KERN_ERR, "No memory for edac device\n");
goto err1;
}
dev_info->edac_dev->pvt_info = dev_info;
dev_info->edac_dev->dev = &dev_info->pdev->dev;
dev_info->edac_dev->ctl_name = dev_info->ctl_name;
dev_info->edac_dev->mod_name = CPC925_EDAC_MOD_STR;
dev_info->edac_dev->dev_name = dev_name(&dev_info->pdev->dev);
if (edac_op_state == EDAC_OPSTATE_POLL)
dev_info->edac_dev->edac_check = dev_info->check;
if (dev_info->init)
dev_info->init(dev_info);
if (edac_device_add_device(dev_info->edac_dev) > 0) {
cpc925_printk(KERN_ERR,
"Unable to add edac device for %s\n",
dev_info->ctl_name);
goto err2;
}
debugf0("%s: Successfully added edac device for %s\n",
__func__, dev_info->ctl_name);
continue;
err2:
if (dev_info->exit)
dev_info->exit(dev_info);
edac_device_free_ctl_info(dev_info->edac_dev);
err1:
platform_device_unregister(dev_info->pdev);
}
}
/*
* Delete the common "edac_device" for CPU Err Detection
* and HyperTransport Link Err Detection
*/
static void cpc925_del_edac_devices(void)
{
struct cpc925_dev_info *dev_info;
for (dev_info = &cpc925_devs[0]; dev_info->init; dev_info++) {
if (dev_info->edac_dev) {
edac_device_del_device(dev_info->edac_dev->dev);
edac_device_free_ctl_info(dev_info->edac_dev);
platform_device_unregister(dev_info->pdev);
}
if (dev_info->exit)
dev_info->exit(dev_info);
debugf0("%s: Successfully deleted edac device for %s\n",
__func__, dev_info->ctl_name);
}
}
/* Convert current back-ground scrub rate into byte/sec bandwidth */
static int cpc925_get_sdram_scrub_rate(struct mem_ctl_info *mci)
{
struct cpc925_mc_pdata *pdata = mci->pvt_info;
int bw;
u32 mscr;
u8 si;
mscr = __raw_readl(pdata->vbase + REG_MSCR_OFFSET);
si = (mscr & MSCR_SI_MASK) >> MSCR_SI_SHIFT;
debugf0("%s, Mem Scrub Ctrl Register 0x%x\n", __func__, mscr);
if (((mscr & MSCR_SCRUB_MOD_MASK) != MSCR_BACKGR_SCRUB) ||
(si == 0)) {
cpc925_mc_printk(mci, KERN_INFO, "Scrub mode not enabled\n");
bw = 0;
} else
bw = CPC925_SCRUB_BLOCK_SIZE * 0xFA67 / si;
return bw;
}
/* Return 0 for single channel; 1 for dual channel */
static int cpc925_mc_get_channels(void __iomem *vbase)
{
int dual = 0;
u32 mbcr;
mbcr = __raw_readl(vbase + REG_MBCR_OFFSET);
/*
* Dual channel only when 128-bit wide physical bus
* and 128-bit configuration.
*/
if (((mbcr & MBCR_64BITCFG_MASK) == 0) &&
((mbcr & MBCR_64BITBUS_MASK) == 0))
dual = 1;
debugf0("%s: %s channel\n", __func__,
(dual > 0) ? "Dual" : "Single");
return dual;
}
static int __devinit cpc925_probe(struct platform_device *pdev)
{
static int edac_mc_idx;
struct mem_ctl_info *mci;
void __iomem *vbase;
struct cpc925_mc_pdata *pdata;
struct resource *r;
int res = 0, nr_channels;
debugf0("%s: %s platform device found!\n", __func__, pdev->name);
if (!devres_open_group(&pdev->dev, cpc925_probe, GFP_KERNEL)) {
res = -ENOMEM;
goto out;
}
r = platform_get_resource(pdev, IORESOURCE_MEM, 0);
if (!r) {
cpc925_printk(KERN_ERR, "Unable to get resource\n");
res = -ENOENT;
goto err1;
}
if (!devm_request_mem_region(&pdev->dev,
r->start,
resource_size(r),
pdev->name)) {
cpc925_printk(KERN_ERR, "Unable to request mem region\n");
res = -EBUSY;
goto err1;
}
vbase = devm_ioremap(&pdev->dev, r->start, resource_size(r));
if (!vbase) {
cpc925_printk(KERN_ERR, "Unable to ioremap device\n");
res = -ENOMEM;
goto err2;
}
nr_channels = cpc925_mc_get_channels(vbase);
mci = edac_mc_alloc(sizeof(struct cpc925_mc_pdata),
CPC925_NR_CSROWS, nr_channels + 1, edac_mc_idx);
if (!mci) {
cpc925_printk(KERN_ERR, "No memory for mem_ctl_info\n");
res = -ENOMEM;
goto err2;
}
pdata = mci->pvt_info;
pdata->vbase = vbase;
pdata->edac_idx = edac_mc_idx++;
pdata->name = pdev->name;
mci->dev = &pdev->dev;
platform_set_drvdata(pdev, mci);
mci->dev_name = dev_name(&pdev->dev);
mci->mtype_cap = MEM_FLAG_RDDR | MEM_FLAG_DDR;
mci->edac_ctl_cap = EDAC_FLAG_NONE | EDAC_FLAG_SECDED;
mci->edac_cap = EDAC_FLAG_SECDED;
mci->mod_name = CPC925_EDAC_MOD_STR;
mci->mod_ver = CPC925_EDAC_REVISION;
mci->ctl_name = pdev->name;
if (edac_op_state == EDAC_OPSTATE_POLL)
mci->edac_check = cpc925_mc_check;
mci->ctl_page_to_phys = NULL;
mci->scrub_mode = SCRUB_SW_SRC;
mci->set_sdram_scrub_rate = NULL;
mci->get_sdram_scrub_rate = cpc925_get_sdram_scrub_rate;
cpc925_init_csrows(mci);
/* Setup memory controller registers */
cpc925_mc_init(mci);
if (edac_mc_add_mc(mci) > 0) {
cpc925_mc_printk(mci, KERN_ERR, "Failed edac_mc_add_mc()\n");
goto err3;
}
cpc925_add_edac_devices(vbase);
/* get this far and it's successful */
debugf0("%s: success\n", __func__);
res = 0;
goto out;
err3:
cpc925_mc_exit(mci);
edac_mc_free(mci);
err2:
devm_release_mem_region(&pdev->dev, r->start, resource_size(r));
err1:
devres_release_group(&pdev->dev, cpc925_probe);
out:
return res;
}
static int cpc925_remove(struct platform_device *pdev)
{
struct mem_ctl_info *mci = platform_get_drvdata(pdev);
/*
* Delete common edac devices before edac mc, because
* the former share the MMIO of the latter.
*/
cpc925_del_edac_devices();
cpc925_mc_exit(mci);
edac_mc_del_mc(&pdev->dev);
edac_mc_free(mci);
return 0;
}
static struct platform_driver cpc925_edac_driver = {
.probe = cpc925_probe,
.remove = cpc925_remove,
.driver = {
.name = "cpc925_edac",
}
};
static int __init cpc925_edac_init(void)
{
int ret = 0;
printk(KERN_INFO "IBM CPC925 EDAC driver " CPC925_EDAC_REVISION "\n");
printk(KERN_INFO "\t(c) 2008 Wind River Systems, Inc\n");
/* Only support POLL mode so far */
edac_op_state = EDAC_OPSTATE_POLL;
ret = platform_driver_register(&cpc925_edac_driver);
if (ret) {
printk(KERN_WARNING "Failed to register %s\n",
CPC925_EDAC_MOD_STR);
}
return ret;
}
static void __exit cpc925_edac_exit(void)
{
platform_driver_unregister(&cpc925_edac_driver);
}
module_init(cpc925_edac_init);
module_exit(cpc925_edac_exit);
MODULE_LICENSE("GPL");
MODULE_AUTHOR("Cao Qingtao <qingtao.cao@windriver.com>");
MODULE_DESCRIPTION("IBM CPC925 Bridge and MC EDAC kernel module");
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