path: root/drivers/edac/mv64x60_edac.c

/*
 * Marvell MV64x60 Memory Controller kernel module for PPC platforms
 *
 * 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/slab.h>
#include <linux/interrupt.h>
#include <linux/io.h>
#include <linux/edac.h>

#include "edac_core.h"
#include "edac_module.h"
#include "mv64x60_edac.h"

static const char *mv64x60_ctl_name = "MV64x60";
static int edac_dev_idx;
static int edac_pci_idx;
static int edac_mc_idx;

/*********************** PCI err device **********************************/
#ifdef CONFIG_PCI
static void mv64x60_pci_check(struct edac_pci_ctl_info *pci)
{
	struct mv64x60_pci_pdata *pdata = pci->pvt_info;
	u32 cause;

	cause = in_le32(pdata->pci_vbase + MV64X60_PCI_ERROR_CAUSE);
	if (!cause)
		return;

	printk(KERN_ERR "Error in PCI %d Interface\n", pdata->pci_hose);
	printk(KERN_ERR "Cause register: 0x%08x\n", cause);
	printk(KERN_ERR "Address Low: 0x%08x\n",
	       in_le32(pdata->pci_vbase + MV64X60_PCI_ERROR_ADDR_LO));
	printk(KERN_ERR "Address High: 0x%08x\n",
	       in_le32(pdata->pci_vbase + MV64X60_PCI_ERROR_ADDR_HI));
	printk(KERN_ERR "Attribute: 0x%08x\n",
	       in_le32(pdata->pci_vbase + MV64X60_PCI_ERROR_ATTR));
	printk(KERN_ERR "Command: 0x%08x\n",
	       in_le32(pdata->pci_vbase + MV64X60_PCI_ERROR_CMD));
	out_le32(pdata->pci_vbase + MV64X60_PCI_ERROR_CAUSE, ~cause);

	if (cause & MV64X60_PCI_PE_MASK)
		edac_pci_handle_pe(pci, pci->ctl_name);

	if (!(cause & MV64X60_PCI_PE_MASK))
		edac_pci_handle_npe(pci, pci->ctl_name);
}

static irqreturn_t mv64x60_pci_isr(int irq, void *dev_id)
{
	struct edac_pci_ctl_info *pci = dev_id;
	struct mv64x60_pci_pdata *pdata = pci->pvt_info;
	u32 val;

	val = in_le32(pdata->pci_vbase + MV64X60_PCI_ERROR_CAUSE);
	if (!val)
		return IRQ_NONE;

	mv64x60_pci_check(pci);

	return IRQ_HANDLED;
}

/*
 * Bit 0 of MV64x60_PCIx_ERR_MASK does not exist on the 64360 and because of
 * errata FEr-#11 and FEr-##16 for the 64460, it should be 0 on that chip as
 * well.  IOW, don't set bit 0.
 */

/* Erratum FEr PCI-#16: clear bit 0 of PCI SERRn Mask reg. */
static int __init mv64x60_pci_fixup(struct platform_device *pdev)
{
	struct resource *r;
	void __iomem *pci_serr;

	r = platform_get_resource(pdev, IORESOURCE_MEM, 1);
	if (!r) {
		printk(KERN_ERR "%s: Unable to get resource for "
		       "PCI err regs\n", __func__);
		return -ENOENT;
	}

	pci_serr = ioremap(r->start, r->end - r->start + 1);
	if (!pci_serr)
		return -ENOMEM;

	out_le32(pci_serr, in_le32(pci_serr) & ~0x1);
	iounmap(pci_serr);

	return 0;
}

static int __devinit mv64x60_pci_err_probe(struct platform_device *pdev)
{
	struct edac_pci_ctl_info *pci;
	struct mv64x60_pci_pdata *pdata;
	struct resource *r;
	int res = 0;

	if (!devres_open_group(&pdev->dev, mv64x60_pci_err_probe, GFP_KERNEL))
		return -ENOMEM;

	pci = edac_pci_alloc_ctl_info(sizeof(*pdata), "mv64x60_pci_err");
	if (!pci)
		return -ENOMEM;

	pdata = pci->pvt_info;

	pdata->pci_hose = pdev->id;
	pdata->name = "mpc85xx_pci_err";
	pdata->irq = NO_IRQ;
	platform_set_drvdata(pdev, pci);
	pci->dev = &pdev->dev;
	pci->dev_name = dev_name(&pdev->dev);
	pci->mod_name = EDAC_MOD_STR;
	pci->ctl_name = pdata->name;

	if (edac_op_state == EDAC_OPSTATE_POLL)
		pci->edac_check = mv64x60_pci_check;

	pdata->edac_idx = edac_pci_idx++;

	r = platform_get_resource(pdev, IORESOURCE_MEM, 0);
	if (!r) {
		printk(KERN_ERR "%s: Unable to get resource for "
		       "PCI err regs\n", __func__);
		res = -ENOENT;
		goto err;
	}

	if (!devm_request_mem_region(&pdev->dev,
				     r->start,
				     r->end - r->start + 1,
				     pdata->name)) {
		printk(KERN_ERR "%s: Error while requesting mem region\n",
		       __func__);
		res = -EBUSY;
		goto err;
	}

	pdata->pci_vbase = devm_ioremap(&pdev->dev,
					r->start,
					r->end - r->start + 1);
	if (!pdata->pci_vbase) {
		printk(KERN_ERR "%s: Unable to setup PCI err regs\n", __func__);
		res = -ENOMEM;
		goto err;
	}

	res = mv64x60_pci_fixup(pdev);
	if (res < 0) {
		printk(