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linux-next/drivers/edac/mpc85xx_edac.c
Scott Wood 666db563d3 EDAC, mpc85xx: Make mpc85xx-pci-edac a platform device 
Originally the mpc85xx-pci-edac driver bound directly to the PCI
controller node.

Commit

  905e75c46d ("powerpc/fsl-pci: Unify pci/pcie initialization code")

turned the PCI controller code into a platform device. Since we can't
have two drivers binding to the same device, the EDAC code was changed
to be called into as a library-style submodule. However, this doesn't
work if the EDAC driver is built as a module.

Commit

  8d8fcba6d1ea ("EDAC: Rip out the edac_subsys reference counting")

exposed another problem with this approach -- mpc85xx_pci_err_probe()
was being called in the same early boot phase that the PCI controller
is initialized, rather than in the device_initcall phase that the EDAC
layer expects. This caused a crash on boot.

To fix this, the PCI controller code now creates a child platform device
specifically for EDAC, which the mpc85xx-pci-edac driver binds to.

Reported-by: Michael Ellerman <mpe@ellerman.id.au>
Reviewed-by: Johannes Thumshirn <jthumshirn@suse.de>
Signed-off-by: Scott Wood <scottwood@freescale.com>
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Cc: Daniel Axtens <dja@axtens.net>
Cc: Doug Thompson <dougthompson@xmission.com>
Cc: Jia Hongtao <B38951@freescale.com>
Cc: Jiri Kosina <jkosina@suse.com>
Cc: Kim Phillips <kim.phillips@freescale.com>
Cc: linux-edac <linux-edac@vger.kernel.org>
Cc: linuxppc-dev@lists.ozlabs.org
Cc: Masanari Iida <standby24x7@gmail.com>
Cc: Mauro Carvalho Chehab <mchehab@osg.samsung.com>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Randy Dunlap <rdunlap@infradead.org>
Cc: Rob Herring <robh@kernel.org>
Link: http://lkml.kernel.org/r/1449774432-18593-1-git-send-email-scottwood@freescale.com
Signed-off-by: Borislav Petkov <bp@suse.de>
2015-12-11 16:56:16 +01:00

1312 lines
35 KiB
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/*
* Freescale MPC85xx Memory Controller kernel module
*
* Parts Copyrighted (c) 2013 by Freescale Semiconductor, Inc.
*
* Author: Dave Jiang <djiang@mvista.com>
*
* 2006-2007 (c) MontaVista Software, Inc. This file is licensed under
* the terms of the GNU General Public License version 2. This program
* is licensed "as is" without any warranty of any kind, whether express
* or implied.
*
*/
#include <linux/module.h>
#include <linux/init.h>
#include <linux/interrupt.h>
#include <linux/ctype.h>
#include <linux/io.h>
#include <linux/mod_devicetable.h>
#include <linux/edac.h>
#include <linux/smp.h>
#include <linux/gfp.h>
#include <linux/fsl/edac.h>
#include <linux/of_platform.h>
#include <linux/of_device.h>
#include "edac_module.h"
#include "edac_core.h"
#include "mpc85xx_edac.h"
static int edac_dev_idx;
#ifdef CONFIG_PCI
static int edac_pci_idx;
#endif
static int edac_mc_idx;
static u32 orig_ddr_err_disable;
static u32 orig_ddr_err_sbe;
/*
* PCI Err defines
*/
#ifdef CONFIG_PCI
static u32 orig_pci_err_cap_dr;
static u32 orig_pci_err_en;
#endif
static u32 orig_l2_err_disable;
#ifdef CONFIG_FSL_SOC_BOOKE
static u32 orig_hid1[2];
#endif
/************************ MC SYSFS parts ***********************************/
#define to_mci(k) container_of(k, struct mem_ctl_info, dev)
static ssize_t mpc85xx_mc_inject_data_hi_show(struct device *dev,
struct device_attribute *mattr,
char *data)
{
struct mem_ctl_info *mci = to_mci(dev);
struct mpc85xx_mc_pdata *pdata = mci->pvt_info;
return sprintf(data, "0x%08x",
in_be32(pdata->mc_vbase +
MPC85XX_MC_DATA_ERR_INJECT_HI));
}
static ssize_t mpc85xx_mc_inject_data_lo_show(struct device *dev,
struct device_attribute *mattr,
char *data)
{
struct mem_ctl_info *mci = to_mci(dev);
struct mpc85xx_mc_pdata *pdata = mci->pvt_info;
return sprintf(data, "0x%08x",
in_be32(pdata->mc_vbase +
MPC85XX_MC_DATA_ERR_INJECT_LO));
}
static ssize_t mpc85xx_mc_inject_ctrl_show(struct device *dev,
struct device_attribute *mattr,
char *data)
{
struct mem_ctl_info *mci = to_mci(dev);
struct mpc85xx_mc_pdata *pdata = mci->pvt_info;
return sprintf(data, "0x%08x",
in_be32(pdata->mc_vbase + MPC85XX_MC_ECC_ERR_INJECT));
}
static ssize_t mpc85xx_mc_inject_data_hi_store(struct device *dev,
struct device_attribute *mattr,
const char *data, size_t count)
{
struct mem_ctl_info *mci = to_mci(dev);
struct mpc85xx_mc_pdata *pdata = mci->pvt_info;
if (isdigit(*data)) {
out_be32(pdata->mc_vbase + MPC85XX_MC_DATA_ERR_INJECT_HI,
simple_strtoul(data, NULL, 0));
return count;
}
return 0;
}
static ssize_t mpc85xx_mc_inject_data_lo_store(struct device *dev,
struct device_attribute *mattr,
const char *data, size_t count)
{
struct mem_ctl_info *mci = to_mci(dev);
struct mpc85xx_mc_pdata *pdata = mci->pvt_info;
if (isdigit(*data)) {
out_be32(pdata->mc_vbase + MPC85XX_MC_DATA_ERR_INJECT_LO,
simple_strtoul(data, NULL, 0));
return count;
}
return 0;
}
static ssize_t mpc85xx_mc_inject_ctrl_store(struct device *dev,
struct device_attribute *mattr,
const char *data, size_t count)
{
struct mem_ctl_info *mci = to_mci(dev);
struct mpc85xx_mc_pdata *pdata = mci->pvt_info;
if (isdigit(*data)) {
out_be32(pdata->mc_vbase + MPC85XX_MC_ECC_ERR_INJECT,
simple_strtoul(data, NULL, 0));
return count;
}
return 0;
}
DEVICE_ATTR(inject_data_hi, S_IRUGO | S_IWUSR,
mpc85xx_mc_inject_data_hi_show, mpc85xx_mc_inject_data_hi_store);
DEVICE_ATTR(inject_data_lo, S_IRUGO | S_IWUSR,
mpc85xx_mc_inject_data_lo_show, mpc85xx_mc_inject_data_lo_store);
DEVICE_ATTR(inject_ctrl, S_IRUGO | S_IWUSR,
mpc85xx_mc_inject_ctrl_show, mpc85xx_mc_inject_ctrl_store);
static struct attribute *mpc85xx_dev_attrs[] = {
&dev_attr_inject_data_hi.attr,
&dev_attr_inject_data_lo.attr,
&dev_attr_inject_ctrl.attr,
NULL
};
ATTRIBUTE_GROUPS(mpc85xx_dev);
/**************************** PCI Err device ***************************/
#ifdef CONFIG_PCI
static void mpc85xx_pci_check(struct edac_pci_ctl_info *pci)
{
struct mpc85xx_pci_pdata *pdata = pci->pvt_info;
u32 err_detect;
err_detect = in_be32(pdata->pci_vbase + MPC85XX_PCI_ERR_DR);
/* master aborts can happen during PCI config cycles */
if (!(err_detect & ~(PCI_EDE_MULTI_ERR | PCI_EDE_MST_ABRT))) {
out_be32(pdata->pci_vbase + MPC85XX_PCI_ERR_DR, err_detect);
return;
}
printk(KERN_ERR "PCI error(s) detected\n");
printk(KERN_ERR "PCI/X ERR_DR register: %#08x\n", err_detect);
printk(KERN_ERR "PCI/X ERR_ATTRIB register: %#08x\n",
in_be32(pdata->pci_vbase + MPC85XX_PCI_ERR_ATTRIB));
printk(KERN_ERR "PCI/X ERR_ADDR register: %#08x\n",
in_be32(pdata->pci_vbase + MPC85XX_PCI_ERR_ADDR));
printk(KERN_ERR "PCI/X ERR_EXT_ADDR register: %#08x\n",
in_be32(pdata->pci_vbase + MPC85XX_PCI_ERR_EXT_ADDR));
printk(KERN_ERR "PCI/X ERR_DL register: %#08x\n",
in_be32(pdata->pci_vbase + MPC85XX_PCI_ERR_DL));
printk(KERN_ERR "PCI/X ERR_DH register: %#08x\n",
in_be32(pdata->pci_vbase + MPC85XX_PCI_ERR_DH));
/* clear error bits */
out_be32(pdata->pci_vbase + MPC85XX_PCI_ERR_DR, err_detect);
if (err_detect & PCI_EDE_PERR_MASK)
edac_pci_handle_pe(pci, pci->ctl_name);
if ((err_detect & ~PCI_EDE_MULTI_ERR) & ~PCI_EDE_PERR_MASK)
edac_pci_handle_npe(pci, pci->ctl_name);
}
static void mpc85xx_pcie_check(struct edac_pci_ctl_info *pci)
{
struct mpc85xx_pci_pdata *pdata = pci->pvt_info;
u32 err_detect;
err_detect = in_be32(pdata->pci_vbase + MPC85XX_PCI_ERR_DR);
pr_err("PCIe error(s) detected\n");
pr_err("PCIe ERR_DR register: 0x%08x\n", err_detect);
pr_err("PCIe ERR_CAP_STAT register: 0x%08x\n",
in_be32(pdata->pci_vbase + MPC85XX_PCI_GAS_TIMR));
pr_err("PCIe ERR_CAP_R0 register: 0x%08x\n",
in_be32(pdata->pci_vbase + MPC85XX_PCIE_ERR_CAP_R0));
pr_err("PCIe ERR_CAP_R1 register: 0x%08x\n",
in_be32(pdata->pci_vbase + MPC85XX_PCIE_ERR_CAP_R1));
pr_err("PCIe ERR_CAP_R2 register: 0x%08x\n",
in_be32(pdata->pci_vbase + MPC85XX_PCIE_ERR_CAP_R2));
pr_err("PCIe ERR_CAP_R3 register: 0x%08x\n",
in_be32(pdata->pci_vbase + MPC85XX_PCIE_ERR_CAP_R3));
/* clear error bits */
out_be32(pdata->pci_vbase + MPC85XX_PCI_ERR_DR, err_detect);
}
static int mpc85xx_pcie_find_capability(struct device_node *np)
{
struct pci_controller *hose;
if (!np)
return -EINVAL;
hose = pci_find_hose_for_OF_device(np);
return early_find_capability(hose, 0, 0, PCI_CAP_ID_EXP);
}
static irqreturn_t mpc85xx_pci_isr(int irq, void *dev_id)
{
struct edac_pci_ctl_info *pci = dev_id;
struct mpc85xx_pci_pdata *pdata = pci->pvt_info;
u32 err_detect;
err_detect = in_be32(pdata->pci_vbase + MPC85XX_PCI_ERR_DR);
if (!err_detect)
return IRQ_NONE;
if (pdata->is_pcie)
mpc85xx_pcie_check(pci);
else
mpc85xx_pci_check(pci);
return IRQ_HANDLED;
}
static int mpc85xx_pci_err_probe(struct platform_device *op)
{
struct edac_pci_ctl_info *pci;
struct mpc85xx_pci_pdata *pdata;
struct mpc85xx_edac_pci_plat_data *plat_data;
struct device_node *of_node;
struct resource r;
int res = 0;
if (!devres_open_group(&op->dev, mpc85xx_pci_err_probe, GFP_KERNEL))
return -ENOMEM;
pci = edac_pci_alloc_ctl_info(sizeof(*pdata), "mpc85xx_pci_err");
if (!pci)
return -ENOMEM;
/* make sure error reporting method is sane */
switch (edac_op_state) {
case EDAC_OPSTATE_POLL:
case EDAC_OPSTATE_INT:
break;
default:
edac_op_state = EDAC_OPSTATE_INT;
break;
}
pdata = pci->pvt_info;
pdata->name = "mpc85xx_pci_err";
pdata->irq = NO_IRQ;
plat_data = op->dev.platform_data;
if (!plat_data) {
dev_err(&op->dev, "no platform data");
res = -ENXIO;
goto err;
}
of_node = plat_data->of_node;
if (mpc85xx_pcie_find_capability(of_node) > 0)
pdata->is_pcie = true;
dev_set_drvdata(&op->dev, pci);
pci->dev = &op->dev;
pci->mod_name = EDAC_MOD_STR;
pci->ctl_name = pdata->name;
pci->dev_name = dev_name(&op->dev);
if (edac_op_state == EDAC_OPSTATE_POLL) {
if (pdata->is_pcie)
pci->edac_check = mpc85xx_pcie_check;
else
pci->edac_check = mpc85xx_pci_check;
}
pdata->edac_idx = edac_pci_idx++;
res = of_address_to_resource(of_node, 0, &r);
if (res) {
printk(KERN_ERR "%s: Unable to get resource for "
"PCI err regs\n", __func__);
goto err;
}
/* we only need the error registers */
r.start += 0xe00;
if (!devm_request_mem_region(&op->dev, r.start, resource_size(&r),
pdata->name)) {
printk(KERN_ERR "%s: Error while requesting mem region\n",
__func__);
res = -EBUSY;
goto err;
}
pdata->pci_vbase = devm_ioremap(&op->dev, r.start, resource_size(&r));
if (!pdata->pci_vbase) {
printk(KERN_ERR "%s: Unable to setup PCI err regs\n", __func__);
res = -ENOMEM;
goto err;
}
if (pdata->is_pcie) {
orig_pci_err_cap_dr =
in_be32(pdata->pci_vbase + MPC85XX_PCI_ERR_ADDR);
out_be32(pdata->pci_vbase + MPC85XX_PCI_ERR_ADDR, ~0);
orig_pci_err_en =
in_be32(pdata->pci_vbase + MPC85XX_PCI_ERR_EN);
out_be32(pdata->pci_vbase + MPC85XX_PCI_ERR_EN, 0);
} else {
orig_pci_err_cap_dr =
in_be32(pdata->pci_vbase + MPC85XX_PCI_ERR_CAP_DR);
/* PCI master abort is expected during config cycles */
out_be32(pdata->pci_vbase + MPC85XX_PCI_ERR_CAP_DR, 0x40);
orig_pci_err_en =
in_be32(pdata->pci_vbase + MPC85XX_PCI_ERR_EN);
/* disable master abort reporting */
out_be32(pdata->pci_vbase + MPC85XX_PCI_ERR_EN, ~0x40);
}
/* clear error bits */
out_be32(pdata->pci_vbase + MPC85XX_PCI_ERR_DR, ~0);
if (edac_pci_add_device(pci, pdata->edac_idx) > 0) {
edac_dbg(3, "failed edac_pci_add_device()\n");
goto err;
}
if (edac_op_state == EDAC_OPSTATE_INT) {
pdata->irq = irq_of_parse_and_map(of_node, 0);
res = devm_request_irq(&op->dev, pdata->irq,
mpc85xx_pci_isr,
IRQF_SHARED,
"[EDAC] PCI err", pci);
if (res < 0) {
printk(KERN_ERR
"%s: Unable to request irq %d for "
"MPC85xx PCI err\n", __func__, pdata->irq);
irq_dispose_mapping(pdata->irq);
res = -ENODEV;
goto err2;
}
printk(KERN_INFO EDAC_MOD_STR " acquired irq %d for PCI Err\n",
pdata->irq);
}
if (pdata->is_pcie) {
/*
* Enable all PCIe error interrupt & error detect except invalid
* PEX_CONFIG_ADDR/PEX_CONFIG_DATA access interrupt generation
* enable bit and invalid PEX_CONFIG_ADDR/PEX_CONFIG_DATA access
* detection enable bit. Because PCIe bus code to initialize and
* configure these PCIe devices on booting will use some invalid
* PEX_CONFIG_ADDR/PEX_CONFIG_DATA, edac driver prints the much
* notice information. So disable this detect to fix ugly print.
*/
out_be32(pdata->pci_vbase + MPC85XX_PCI_ERR_EN, ~0
& ~PEX_ERR_ICCAIE_EN_BIT);
out_be32(pdata->pci_vbase + MPC85XX_PCI_ERR_ADDR, 0
| PEX_ERR_ICCAD_DISR_BIT);
}
devres_remove_group(&op->dev, mpc85xx_pci_err_probe);
edac_dbg(3, "success\n");
printk(KERN_INFO EDAC_MOD_STR " PCI err registered\n");
return 0;
err2:
edac_pci_del_device(&op->dev);
err:
edac_pci_free_ctl_info(pci);
devres_release_group(&op->dev, mpc85xx_pci_err_probe);
return res;
}
static const struct platform_device_id mpc85xx_pci_err_match[] = {
{
.name = "mpc85xx-pci-edac"
},
{}
};
static struct platform_driver mpc85xx_pci_err_driver = {
.probe = mpc85xx_pci_err_probe,
.id_table = mpc85xx_pci_err_match,
.driver = {
.name = "mpc85xx_pci_err",
.suppress_bind_attrs = true,
},
};
#endif /* CONFIG_PCI */
/**************************** L2 Err device ***************************/
/************************ L2 SYSFS parts ***********************************/
static ssize_t mpc85xx_l2_inject_data_hi_show(struct edac_device_ctl_info
*edac_dev, char *data)
{
struct mpc85xx_l2_pdata *pdata = edac_dev->pvt_info;
return sprintf(data, "0x%08x",
in_be32(pdata->l2_vbase + MPC85XX_L2_ERRINJHI));
}
static ssize_t mpc85xx_l2_inject_data_lo_show(struct edac_device_ctl_info
*edac_dev, char *data)
{
struct mpc85xx_l2_pdata *pdata = edac_dev->pvt_info;
return sprintf(data, "0x%08x",
in_be32(pdata->l2_vbase + MPC85XX_L2_ERRINJLO));
}
static ssize_t mpc85xx_l2_inject_ctrl_show(struct edac_device_ctl_info
*edac_dev, char *data)
{
struct mpc85xx_l2_pdata *pdata = edac_dev->pvt_info;
return sprintf(data, "0x%08x",
in_be32(pdata->l2_vbase + MPC85XX_L2_ERRINJCTL));
}
static ssize_t mpc85xx_l2_inject_data_hi_store(struct edac_device_ctl_info
*edac_dev, const char *data,
size_t count)
{
struct mpc85xx_l2_pdata *pdata = edac_dev->pvt_info;
if (isdigit(*data)) {
out_be32(pdata->l2_vbase + MPC85XX_L2_ERRINJHI,
simple_strtoul(data, NULL, 0));
return count;
}
return 0;
}
static ssize_t mpc85xx_l2_inject_data_lo_store(struct edac_device_ctl_info
*edac_dev, const char *data,
size_t count)
{
struct mpc85xx_l2_pdata *pdata = edac_dev->pvt_info;
if (isdigit(*data)) {
out_be32(pdata->l2_vbase + MPC85XX_L2_ERRINJLO,
simple_strtoul(data, NULL, 0));
return count;
}
return 0;
}
static ssize_t mpc85xx_l2_inject_ctrl_store(struct edac_device_ctl_info
*edac_dev, const char *data,
size_t count)
{
struct mpc85xx_l2_pdata *pdata = edac_dev->pvt_info;
if (isdigit(*data)) {
out_be32(pdata->l2_vbase + MPC85XX_L2_ERRINJCTL,
simple_strtoul(data, NULL, 0));
return count;
}
return 0;
}
static struct edac_dev_sysfs_attribute mpc85xx_l2_sysfs_attributes[] = {
{
.attr = {
.name = "inject_data_hi",
.mode = (S_IRUGO | S_IWUSR)
},
.show = mpc85xx_l2_inject_data_hi_show,
.store = mpc85xx_l2_inject_data_hi_store},
{
.attr = {
.name = "inject_data_lo",
.mode = (S_IRUGO | S_IWUSR)
},
.show = mpc85xx_l2_inject_data_lo_show,
.store = mpc85xx_l2_inject_data_lo_store},
{
.attr = {
.name = "inject_ctrl",
.mode = (S_IRUGO | S_IWUSR)
},
.show = mpc85xx_l2_inject_ctrl_show,
.store = mpc85xx_l2_inject_ctrl_store},
/* End of list */
{
.attr = {.name = NULL}
}
};
static void mpc85xx_set_l2_sysfs_attributes(struct edac_device_ctl_info
*edac_dev)
{
edac_dev->sysfs_attributes = mpc85xx_l2_sysfs_attributes;
}
/***************************** L2 ops ***********************************/
static void mpc85xx_l2_check(struct edac_device_ctl_info *edac_dev)
{
struct mpc85xx_l2_pdata *pdata = edac_dev->pvt_info;
u32 err_detect;
err_detect = in_be32(pdata->l2_vbase + MPC85XX_L2_ERRDET);
if (!(err_detect & L2_EDE_MASK))
return;
printk(KERN_ERR "ECC Error in CPU L2 cache\n");
printk(KERN_ERR "L2 Error Detect Register: 0x%08x\n", err_detect);
printk(KERN_ERR "L2 Error Capture Data High Register: 0x%08x\n",
in_be32(pdata->l2_vbase + MPC85XX_L2_CAPTDATAHI));
printk(KERN_ERR "L2 Error Capture Data Lo Register: 0x%08x\n",
in_be32(pdata->l2_vbase + MPC85XX_L2_CAPTDATALO));
printk(KERN_ERR "L2 Error Syndrome Register: 0x%08x\n",
in_be32(pdata->l2_vbase + MPC85XX_L2_CAPTECC));
printk(KERN_ERR "L2 Error Attributes Capture Register: 0x%08x\n",
in_be32(pdata->l2_vbase + MPC85XX_L2_ERRATTR));
printk(KERN_ERR "L2 Error Address Capture Register: 0x%08x\n",
in_be32(pdata->l2_vbase + MPC85XX_L2_ERRADDR));
/* clear error detect register */
out_be32(pdata->l2_vbase + MPC85XX_L2_ERRDET, err_detect);
if (err_detect & L2_EDE_CE_MASK)
edac_device_handle_ce(edac_dev, 0, 0, edac_dev->ctl_name);
if (err_detect & L2_EDE_UE_MASK)
edac_device_handle_ue(edac_dev, 0, 0, edac_dev->ctl_name);
}
static irqreturn_t mpc85xx_l2_isr(int irq, void *dev_id)
{
struct edac_device_ctl_info *edac_dev = dev_id;
struct mpc85xx_l2_pdata *pdata = edac_dev->pvt_info;
u32 err_detect;
err_detect = in_be32(pdata->l2_vbase + MPC85XX_L2_ERRDET);
if (!(err_detect & L2_EDE_MASK))
return IRQ_NONE;
mpc85xx_l2_check(edac_dev);
return IRQ_HANDLED;
}
static int mpc85xx_l2_err_probe(struct platform_device *op)
{
struct edac_device_ctl_info *edac_dev;
struct mpc85xx_l2_pdata *pdata;
struct resource r;
int res;
if (!devres_open_group(&op->dev, mpc85xx_l2_err_probe, GFP_KERNEL))
return -ENOMEM;
edac_dev = edac_device_alloc_ctl_info(sizeof(*pdata),
"cpu", 1, "L", 1, 2, NULL, 0,
edac_dev_idx);
if (!edac_dev) {
devres_release_group(&op->dev, mpc85xx_l2_err_probe);
return -ENOMEM;
}
pdata = edac_dev->pvt_info;
pdata->name = "mpc85xx_l2_err";
pdata->irq = NO_IRQ;
edac_dev->dev = &op->dev;
dev_set_drvdata(edac_dev->dev, edac_dev);
edac_dev->ctl_name = pdata->name;
edac_dev->dev_name = pdata->name;
res = of_address_to_resource(op->dev.of_node, 0, &r);
if (res) {
printk(KERN_ERR "%s: Unable to get resource for "
"L2 err regs\n", __func__);
goto err;
}
/* we only need the error registers */
r.start += 0xe00;
if (!devm_request_mem_region(&op->dev, r.start, resource_size(&r),
pdata->name)) {
printk(KERN_ERR "%s: Error while requesting mem region\n",
__func__);
res = -EBUSY;
goto err;
}
pdata->l2_vbase = devm_ioremap(&op->dev, r.start, resource_size(&r));
if (!pdata->l2_vbase) {
printk(KERN_ERR "%s: Unable to setup L2 err regs\n", __func__);
res = -ENOMEM;
goto err;
}
out_be32(pdata->l2_vbase + MPC85XX_L2_ERRDET, ~0);
orig_l2_err_disable = in_be32(pdata->l2_vbase + MPC85XX_L2_ERRDIS);
/* clear the err_dis */
out_be32(pdata->l2_vbase + MPC85XX_L2_ERRDIS, 0);
edac_dev->mod_name = EDAC_MOD_STR;
if (edac_op_state == EDAC_OPSTATE_POLL)
edac_dev->edac_check = mpc85xx_l2_check;
mpc85xx_set_l2_sysfs_attributes(edac_dev);
pdata->edac_idx = edac_dev_idx++;
if (edac_device_add_device(edac_dev) > 0) {
edac_dbg(3, "failed edac_device_add_device()\n");
goto err;
}
if (edac_op_state == EDAC_OPSTATE_INT) {
pdata->irq = irq_of_parse_and_map(op->dev.of_node, 0);
res = devm_request_irq(&op->dev, pdata->irq,
mpc85xx_l2_isr, IRQF_SHARED,
"[EDAC] L2 err", edac_dev);
if (res < 0) {
printk(KERN_ERR
"%s: Unable to request irq %d for "
"MPC85xx L2 err\n", __func__, pdata->irq);
irq_dispose_mapping(pdata->irq);
res = -ENODEV;
goto err2;
}
printk(KERN_INFO EDAC_MOD_STR " acquired irq %d for L2 Err\n",
pdata->irq);
edac_dev->op_state = OP_RUNNING_INTERRUPT;
out_be32(pdata->l2_vbase + MPC85XX_L2_ERRINTEN, L2_EIE_MASK);
}
devres_remove_group(&op->dev, mpc85xx_l2_err_probe);
edac_dbg(3, "success\n");
printk(KERN_INFO EDAC_MOD_STR " L2 err registered\n");
return 0;
err2:
edac_device_del_device(&op->dev);
err:
devres_release_group(&op->dev, mpc85xx_l2_err_probe);
edac_device_free_ctl_info(edac_dev);
return res;
}
static int mpc85xx_l2_err_remove(struct platform_device *op)
{
struct edac_device_ctl_info *edac_dev = dev_get_drvdata(&op->dev);
struct mpc85xx_l2_pdata *pdata = edac_dev->pvt_info;
edac_dbg(0, "\n");
if (edac_op_state == EDAC_OPSTATE_INT) {
out_be32(pdata->l2_vbase + MPC85XX_L2_ERRINTEN, 0);
irq_dispose_mapping(pdata->irq);
}
out_be32(pdata->l2_vbase + MPC85XX_L2_ERRDIS, orig_l2_err_disable);
edac_device_del_device(&op->dev);
edac_device_free_ctl_info(edac_dev);
return 0;
}
static const struct of_device_id mpc85xx_l2_err_of_match[] = {
/* deprecate the fsl,85.. forms in the future, 2.6.30? */
{ .compatible = "fsl,8540-l2-cache-controller", },
{ .compatible = "fsl,8541-l2-cache-controller", },
{ .compatible = "fsl,8544-l2-cache-controller", },
{ .compatible = "fsl,8548-l2-cache-controller", },
{ .compatible = "fsl,8555-l2-cache-controller", },
{ .compatible = "fsl,8568-l2-cache-controller", },
{ .compatible = "fsl,mpc8536-l2-cache-controller", },
{ .compatible = "fsl,mpc8540-l2-cache-controller", },
{ .compatible = "fsl,mpc8541-l2-cache-controller", },
{ .compatible = "fsl,mpc8544-l2-cache-controller", },
{ .compatible = "fsl,mpc8548-l2-cache-controller", },
{ .compatible = "fsl,mpc8555-l2-cache-controller", },
{ .compatible = "fsl,mpc8560-l2-cache-controller", },
{ .compatible = "fsl,mpc8568-l2-cache-controller", },
{ .compatible = "fsl,mpc8569-l2-cache-controller", },
{ .compatible = "fsl,mpc8572-l2-cache-controller", },
{ .compatible = "fsl,p1020-l2-cache-controller", },
{ .compatible = "fsl,p1021-l2-cache-controller", },
{ .compatible = "fsl,p2020-l2-cache-controller", },
{},
};
MODULE_DEVICE_TABLE(of, mpc85xx_l2_err_of_match);
static struct platform_driver mpc85xx_l2_err_driver = {
.probe = mpc85xx_l2_err_probe,
.remove = mpc85xx_l2_err_remove,
.driver = {
.name = "mpc85xx_l2_err",
.of_match_table = mpc85xx_l2_err_of_match,
},
};
/**************************** MC Err device ***************************/
/*
* Taken from table 8-55 in the MPC8641 User's Manual and/or 9-61 in the
* MPC8572 User's Manual. Each line represents a syndrome bit column as a
* 64-bit value, but split into an upper and lower 32-bit chunk. The labels
* below correspond to Freescale's manuals.
*/
static unsigned int ecc_table[16] = {
/* MSB LSB */
/* [0:31] [32:63] */
0xf00fe11e, 0xc33c0ff7, /* Syndrome bit 7 */
0x00ff00ff, 0x00fff0ff,
0x0f0f0f0f, 0x0f0fff00,
0x11113333, 0x7777000f,
0x22224444, 0x8888222f,
0x44448888, 0xffff4441,
0x8888ffff, 0x11118882,
0xffff1111, 0x22221114, /* Syndrome bit 0 */
};
/*
* Calculate the correct ECC value for a 64-bit value specified by high:low
*/
static u8 calculate_ecc(u32 high, u32 low)
{
u32 mask_low;
u32 mask_high;
int bit_cnt;
u8 ecc = 0;
int i;
int j;
for (i = 0; i < 8; i++) {
mask_high = ecc_table[i * 2];
mask_low = ecc_table[i * 2 + 1];
bit_cnt = 0;
for (j = 0; j < 32; j++) {
if ((mask_high >> j) & 1)
bit_cnt ^= (high >> j) & 1;
if ((mask_low >> j) & 1)
bit_cnt ^= (low >> j) & 1;
}
ecc |= bit_cnt << i;
}
return ecc;
}
/*
* Create the syndrome code which is generated if the data line specified by
* 'bit' failed. Eg generate an 8-bit codes seen in Table 8-55 in the MPC8641
* User's Manual and 9-61 in the MPC8572 User's Manual.
*/
static u8 syndrome_from_bit(unsigned int bit) {
int i;
u8 syndrome = 0;
/*
* Cycle through the upper or lower 32-bit portion of each value in
* ecc_table depending on if 'bit' is in the upper or lower half of
* 64-bit data.
*/
for (i = bit < 32; i < 16; i += 2)
syndrome |= ((ecc_table[i] >> (bit % 32)) & 1) << (i / 2);
return syndrome;
}
/*
* Decode data and ecc syndrome to determine what went wrong
* Note: This can only decode single-bit errors
*/
static void sbe_ecc_decode(u32 cap_high, u32 cap_low, u32 cap_ecc,
int *bad_data_bit, int *bad_ecc_bit)
{
int i;
u8 syndrome;
*bad_data_bit = -1;
*bad_ecc_bit = -1;
/*
* Calculate the ECC of the captured data and XOR it with the captured
* ECC to find an ECC syndrome value we can search for
*/
syndrome = calculate_ecc(cap_high, cap_low) ^ cap_ecc;
/* Check if a data line is stuck... */
for (i = 0; i < 64; i++) {
if (syndrome == syndrome_from_bit(i)) {
*bad_data_bit = i;
return;
}
}
/* If data is correct, check ECC bits for errors... */
for (i = 0; i < 8; i++) {
if ((syndrome >> i) & 0x1) {
*bad_ecc_bit = i;
return;
}
}
}
#define make64(high, low) (((u64)(high) << 32) | (low))
static void mpc85xx_mc_check(struct mem_ctl_info *mci)
{
struct mpc85xx_mc_pdata *pdata = mci->pvt_info;
struct csrow_info *csrow;
u32 bus_width;
u32 err_detect;
u32 syndrome;
u64 err_addr;
u32 pfn;
int row_index;
u32 cap_high;
u32 cap_low;
int bad_data_bit;
int bad_ecc_bit;
err_detect = in_be32(pdata->mc_vbase + MPC85XX_MC_ERR_DETECT);
if (!err_detect)
return;
mpc85xx_mc_printk(mci, KERN_ERR, "Err Detect Register: %#8.8x\n",
err_detect);
/* no more processing if not ECC bit errors */
if (!(err_detect & (DDR_EDE_SBE | DDR_EDE_MBE))) {
out_be32(pdata->mc_vbase + MPC85XX_MC_ERR_DETECT, err_detect);
return;
}
syndrome = in_be32(pdata->mc_vbase + MPC85XX_MC_CAPTURE_ECC);
/* Mask off appropriate bits of syndrome based on bus width */
bus_width = (in_be32(pdata->mc_vbase + MPC85XX_MC_DDR_SDRAM_CFG) &
DSC_DBW_MASK) ? 32 : 64;
if (bus_width == 64)
syndrome &= 0xff;
else
syndrome &= 0xffff;
err_addr = make64(
in_be32(pdata->mc_vbase + MPC85XX_MC_CAPTURE_EXT_ADDRESS),
in_be32(pdata->mc_vbase + MPC85XX_MC_CAPTURE_ADDRESS));
pfn = err_addr >> PAGE_SHIFT;
for (row_index = 0; row_index < mci->nr_csrows; row_index++) {
csrow = mci->csrows[row_index];
if ((pfn >= csrow->first_page) && (pfn <= csrow->last_page))
break;
}
cap_high = in_be32(pdata->mc_vbase + MPC85XX_MC_CAPTURE_DATA_HI);
cap_low = in_be32(pdata->mc_vbase + MPC85XX_MC_CAPTURE_DATA_LO);
/*
* Analyze single-bit errors on 64-bit wide buses
* TODO: Add support for 32-bit wide buses
*/
if ((err_detect & DDR_EDE_SBE) && (bus_width == 64)) {
sbe_ecc_decode(cap_high, cap_low, syndrome,
&bad_data_bit, &bad_ecc_bit);
if (bad_data_bit != -1)
mpc85xx_mc_printk(mci, KERN_ERR,
"Faulty Data bit: %d\n", bad_data_bit);
if (bad_ecc_bit != -1)
mpc85xx_mc_printk(mci, KERN_ERR,
"Faulty ECC bit: %d\n", bad_ecc_bit);
mpc85xx_mc_printk(mci, KERN_ERR,
"Expected Data / ECC:\t%#8.8x_%08x / %#2.2x\n",
cap_high ^ (1 << (bad_data_bit - 32)),
cap_low ^ (1 << bad_data_bit),
syndrome ^ (1 << bad_ecc_bit));
}
mpc85xx_mc_printk(mci, KERN_ERR,
"Captured Data / ECC:\t%#8.8x_%08x / %#2.2x\n",
cap_high, cap_low, syndrome);
mpc85xx_mc_printk(mci, KERN_ERR, "Err addr: %#8.8llx\n", err_addr);
mpc85xx_mc_printk(mci, KERN_ERR, "PFN: %#8.8x\n", pfn);
/* we are out of range */
if (row_index == mci->nr_csrows)
mpc85xx_mc_printk(mci, KERN_ERR, "PFN out of range!\n");
if (err_detect & DDR_EDE_SBE)
edac_mc_handle_error(HW_EVENT_ERR_CORRECTED, mci, 1,
pfn, err_addr & ~PAGE_MASK, syndrome,
row_index, 0, -1,
mci->ctl_name, "");
if (err_detect & DDR_EDE_MBE)
edac_mc_handle_error(HW_EVENT_ERR_UNCORRECTED, mci, 1,
pfn, err_addr & ~PAGE_MASK, syndrome,
row_index, 0, -1,
mci->ctl_name, "");
out_be32(pdata->mc_vbase + MPC85XX_MC_ERR_DETECT, err_detect);
}
static irqreturn_t mpc85xx_mc_isr(int irq, void *dev_id)
{
struct mem_ctl_info *mci = dev_id;
struct mpc85xx_mc_pdata *pdata = mci->pvt_info;
u32 err_detect;
err_detect = in_be32(pdata->mc_vbase + MPC85XX_MC_ERR_DETECT);
if (!err_detect)
return IRQ_NONE;
mpc85xx_mc_check(mci);
return IRQ_HANDLED;
}
static void mpc85xx_init_csrows(struct mem_ctl_info *mci)
{
struct mpc85xx_mc_pdata *pdata = mci->pvt_info;
struct csrow_info *csrow;
struct dimm_info *dimm;
u32 sdram_ctl;
u32 sdtype;
enum mem_type mtype;
u32 cs_bnds;
int index;
sdram_ctl = in_be32(pdata->mc_vbase + MPC85XX_MC_DDR_SDRAM_CFG);
sdtype = sdram_ctl & DSC_SDTYPE_MASK;
if (sdram_ctl & DSC_RD_EN) {
switch (sdtype) {
case DSC_SDTYPE_DDR:
mtype = MEM_RDDR;
break;
case DSC_SDTYPE_DDR2:
mtype = MEM_RDDR2;
break;
case DSC_SDTYPE_DDR3:
mtype = MEM_RDDR3;
break;
default:
mtype = MEM_UNKNOWN;
break;
}
} else {
switch (sdtype) {
case DSC_SDTYPE_DDR:
mtype = MEM_DDR;
break;
case DSC_SDTYPE_DDR2:
mtype = MEM_DDR2;
break;
case DSC_SDTYPE_DDR3:
mtype = MEM_DDR3;
break;
default:
mtype = MEM_UNKNOWN;
break;
}
}
for (index = 0; index < mci->nr_csrows; index++) {
u32 start;
u32 end;
csrow = mci->csrows[index];
dimm = csrow->channels[0]->dimm;
cs_bnds = in_be32(pdata->mc_vbase + MPC85XX_MC_CS_BNDS_0 +
(index * MPC85XX_MC_CS_BNDS_OFS));
start = (cs_bnds & 0xffff0000) >> 16;
end = (cs_bnds & 0x0000ffff);
if (start == end)
continue; /* not populated */
start <<= (24 - PAGE_SHIFT);
end <<= (24 - PAGE_SHIFT);
end |= (1 << (24 - PAGE_SHIFT)) - 1;
csrow->first_page = start;
csrow->last_page = end;
dimm->nr_pages = end + 1 - start;
dimm->grain = 8;
dimm->mtype = mtype;
dimm->dtype = DEV_UNKNOWN;
if (sdram_ctl & DSC_X32_EN)
dimm->dtype = DEV_X32;
dimm->edac_mode = EDAC_SECDED;
}
}
static int mpc85xx_mc_err_probe(struct platform_device *op)
{
struct mem_ctl_info *mci;
struct edac_mc_layer layers[2];
struct mpc85xx_mc_pdata *pdata;
struct resource r;
u32 sdram_ctl;
int res;
if (!devres_open_group(&op->dev, mpc85xx_mc_err_probe, GFP_KERNEL))
return -ENOMEM;
layers[0].type = EDAC_MC_LAYER_CHIP_SELECT;
layers[0].size = 4;
layers[0].is_virt_csrow = true;
layers[1].type = EDAC_MC_LAYER_CHANNEL;
layers[1].size = 1;
layers[1].is_virt_csrow = false;
mci = edac_mc_alloc(edac_mc_idx, ARRAY_SIZE(layers), layers,
sizeof(*pdata));
if (!mci) {
devres_release_group(&op->dev, mpc85xx_mc_err_probe);
return -ENOMEM;
}
pdata = mci->pvt_info;
pdata->name = "mpc85xx_mc_err";
pdata->irq = NO_IRQ;
mci->pdev = &op->dev;
pdata->edac_idx = edac_mc_idx++;
dev_set_drvdata(mci->pdev, mci);
mci->ctl_name = pdata->name;
mci->dev_name = pdata->name;
res = of_address_to_resource(op->dev.of_node, 0, &r);
if (res) {
printk(KERN_ERR "%s: Unable to get resource for MC err regs\n",
__func__);
goto err;
}
if (!devm_request_mem_region(&op->dev, r.start, resource_size(&r),
pdata->name)) {
printk(KERN_ERR "%s: Error while requesting mem region\n",
__func__);
res = -EBUSY;
goto err;
}
pdata->mc_vbase = devm_ioremap(&op->dev, r.start, resource_size(&r));
if (!pdata->mc_vbase) {
printk(KERN_ERR "%s: Unable to setup MC err regs\n", __func__);
res = -ENOMEM;
goto err;
}
sdram_ctl = in_be32(pdata->mc_vbase + MPC85XX_MC_DDR_SDRAM_CFG);
if (!(sdram_ctl & DSC_ECC_EN)) {
/* no ECC */
printk(KERN_WARNING "%s: No ECC DIMMs discovered\n", __func__);
res = -ENODEV;
goto err;
}
edac_dbg(3, "init mci\n");
mci->mtype_cap = MEM_FLAG_RDDR | MEM_FLAG_RDDR2 |
MEM_FLAG_DDR | MEM_FLAG_DDR2;
mci->edac_ctl_cap = EDAC_FLAG_NONE | EDAC_FLAG_SECDED;
mci->edac_cap = EDAC_FLAG_SECDED;
mci->mod_name = EDAC_MOD_STR;
mci->mod_ver = MPC85XX_REVISION;
if (edac_op_state == EDAC_OPSTATE_POLL)
mci->edac_check = mpc85xx_mc_check;
mci->ctl_page_to_phys = NULL;
mci->scrub_mode = SCRUB_SW_SRC;
mpc85xx_init_csrows(mci);
/* store the original error disable bits */
orig_ddr_err_disable =
in_be32(pdata->mc_vbase + MPC85XX_MC_ERR_DISABLE);
out_be32(pdata->mc_vbase + MPC85XX_MC_ERR_DISABLE, 0);
/* clear all error bits */
out_be32(pdata->mc_vbase + MPC85XX_MC_ERR_DETECT, ~0);
if (edac_mc_add_mc_with_groups(mci, mpc85xx_dev_groups)) {
edac_dbg(3, "failed edac_mc_add_mc()\n");
goto err;
}
if (edac_op_state == EDAC_OPSTATE_INT) {
out_be32(pdata->mc_vbase + MPC85XX_MC_ERR_INT_EN,
DDR_EIE_MBEE | DDR_EIE_SBEE);
/* store the original error management threshold */
orig_ddr_err_sbe = in_be32(pdata->mc_vbase +
MPC85XX_MC_ERR_SBE) & 0xff0000;
/* set threshold to 1 error per interrupt */
out_be32(pdata->mc_vbase + MPC85XX_MC_ERR_SBE, 0x10000);
/* register interrupts */
pdata->irq = irq_of_parse_and_map(op->dev.of_node, 0);
res = devm_request_irq(&op->dev, pdata->irq,
mpc85xx_mc_isr,
IRQF_SHARED,
"[EDAC] MC err", mci);
if (res < 0) {
printk(KERN_ERR "%s: Unable to request irq %d for "
"MPC85xx DRAM ERR\n", __func__, pdata->irq);
irq_dispose_mapping(pdata->irq);
res = -ENODEV;
goto err2;
}
printk(KERN_INFO EDAC_MOD_STR " acquired irq %d for MC\n",
pdata->irq);
}
devres_remove_group(&op->dev, mpc85xx_mc_err_probe);
edac_dbg(3, "success\n");
printk(KERN_INFO EDAC_MOD_STR " MC err registered\n");
return 0;
err2:
edac_mc_del_mc(&op->dev);
err:
devres_release_group(&op->dev, mpc85xx_mc_err_probe);
edac_mc_free(mci);
return res;
}
static int mpc85xx_mc_err_remove(struct platform_device *op)
{
struct mem_ctl_info *mci = dev_get_drvdata(&op->dev);
struct mpc85xx_mc_pdata *pdata = mci->pvt_info;
edac_dbg(0, "\n");
if (edac_op_state == EDAC_OPSTATE_INT) {
out_be32(pdata->mc_vbase + MPC85XX_MC_ERR_INT_EN, 0);
irq_dispose_mapping(pdata->irq);
}
out_be32(pdata->mc_vbase + MPC85XX_MC_ERR_DISABLE,
orig_ddr_err_disable);
out_be32(pdata->mc_vbase + MPC85XX_MC_ERR_SBE, orig_ddr_err_sbe);
edac_mc_del_mc(&op->dev);
edac_mc_free(mci);
return 0;
}
static const struct of_device_id mpc85xx_mc_err_of_match[] = {
/* deprecate the fsl,85.. forms in the future, 2.6.30? */
{ .compatible = "fsl,8540-memory-controller", },
{ .compatible = "fsl,8541-memory-controller", },
{ .compatible = "fsl,8544-memory-controller", },
{ .compatible = "fsl,8548-memory-controller", },
{ .compatible = "fsl,8555-memory-controller", },
{ .compatible = "fsl,8568-memory-controller", },
{ .compatible = "fsl,mpc8536-memory-controller", },
{ .compatible = "fsl,mpc8540-memory-controller", },
{ .compatible = "fsl,mpc8541-memory-controller", },
{ .compatible = "fsl,mpc8544-memory-controller", },
{ .compatible = "fsl,mpc8548-memory-controller", },
{ .compatible = "fsl,mpc8555-memory-controller", },
{ .compatible = "fsl,mpc8560-memory-controller", },
{ .compatible = "fsl,mpc8568-memory-controller", },
{ .compatible = "fsl,mpc8569-memory-controller", },
{ .compatible = "fsl,mpc8572-memory-controller", },
{ .compatible = "fsl,mpc8349-memory-controller", },
{ .compatible = "fsl,p1020-memory-controller", },
{ .compatible = "fsl,p1021-memory-controller", },
{ .compatible = "fsl,p2020-memory-controller", },
{ .compatible = "fsl,qoriq-memory-controller", },
{},
};
MODULE_DEVICE_TABLE(of, mpc85xx_mc_err_of_match);
static struct platform_driver mpc85xx_mc_err_driver = {
.probe = mpc85xx_mc_err_probe,
.remove = mpc85xx_mc_err_remove,
.driver = {
.name = "mpc85xx_mc_err",
.of_match_table = mpc85xx_mc_err_of_match,
},
};
#ifdef CONFIG_FSL_SOC_BOOKE
static void __init mpc85xx_mc_clear_rfxe(void *data)
{
orig_hid1[smp_processor_id()] = mfspr(SPRN_HID1);
mtspr(SPRN_HID1, (orig_hid1[smp_processor_id()] & ~HID1_RFXE));
}
#endif
static struct platform_driver * const drivers[] = {
&mpc85xx_mc_err_driver,
&mpc85xx_l2_err_driver,
#ifdef CONFIG_PCI
&mpc85xx_pci_err_driver,
#endif
};
static int __init mpc85xx_mc_init(void)
{
int res = 0;
u32 pvr = 0;
printk(KERN_INFO "Freescale(R) MPC85xx EDAC driver, "
"(C) 2006 Montavista Software\n");
/* make sure error reporting method is sane */
switch (edac_op_state) {
case EDAC_OPSTATE_POLL:
case EDAC_OPSTATE_INT:
break;
default:
edac_op_state = EDAC_OPSTATE_INT;
break;
}
res = platform_register_drivers(drivers, ARRAY_SIZE(drivers));
if (res)
printk(KERN_WARNING EDAC_MOD_STR "drivers fail to register\n");
#ifdef CONFIG_FSL_SOC_BOOKE
pvr = mfspr(SPRN_PVR);
if ((PVR_VER(pvr) == PVR_VER_E500V1) ||
(PVR_VER(pvr) == PVR_VER_E500V2)) {
/*
* need to clear HID1[RFXE] to disable machine check int
* so we can catch it
*/
if (edac_op_state == EDAC_OPSTATE_INT)
on_each_cpu(mpc85xx_mc_clear_rfxe, NULL, 0);
}
#endif
return 0;
}
module_init(mpc85xx_mc_init);
#ifdef CONFIG_FSL_SOC_BOOKE
static void __exit mpc85xx_mc_restore_hid1(void *data)
{
mtspr(SPRN_HID1, orig_hid1[smp_processor_id()]);
}
#endif
static void __exit mpc85xx_mc_exit(void)
{
#ifdef CONFIG_FSL_SOC_BOOKE
u32 pvr = mfspr(SPRN_PVR);
if ((PVR_VER(pvr) == PVR_VER_E500V1) ||
(PVR_VER(pvr) == PVR_VER_E500V2)) {
on_each_cpu(mpc85xx_mc_restore_hid1, NULL, 0);
}
#endif
platform_unregister_drivers(drivers, ARRAY_SIZE(drivers));
}
module_exit(mpc85xx_mc_exit);
MODULE_LICENSE("GPL");
MODULE_AUTHOR("Montavista Software, Inc.");
module_param(edac_op_state, int, 0444);
MODULE_PARM_DESC(edac_op_state,
"EDAC Error Reporting state: 0=Poll, 2=Interrupt");
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