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authorRob Herring <rob.herring@calxeda.com>2012-06-12 06:32:14 +0400
committerMauro Carvalho Chehab <mchehab@redhat.com>2012-06-27 16:01:29 +0400
commit69154d069869b612383cef9d594f39b34ffba6dd (patch)
treeca356af0247ba18c0ffb1c00d9519530d2347832 /drivers/edac/highbank_l2_edac.c
parenta1b01edb274518c7da6d69b84e7558c092282aad (diff)
downloadlinux-69154d069869b612383cef9d594f39b34ffba6dd.tar.xz
edac: add support for Calxeda highbank L2 cache ecc
Add support for L2 ECC on Calxeda highbank platform. Signed-off-by: Rob Herring <rob.herring@calxeda.com> Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
Diffstat (limited to 'drivers/edac/highbank_l2_edac.c')
-rw-r--r--drivers/edac/highbank_l2_edac.c149
1 files changed, 149 insertions, 0 deletions
diff --git a/drivers/edac/highbank_l2_edac.c b/drivers/edac/highbank_l2_edac.c
new file mode 100644
index 000000000000..e599b00c05a8
--- /dev/null
+++ b/drivers/edac/highbank_l2_edac.c
@@ -0,0 +1,149 @@
+/*
+ * Copyright 2011-2012 Calxeda, Inc.
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms and conditions of the GNU General Public License,
+ * version 2, as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope 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, see <http://www.gnu.org/licenses/>.
+ */
+#include <linux/types.h>
+#include <linux/kernel.h>
+#include <linux/ctype.h>
+#include <linux/edac.h>
+#include <linux/interrupt.h>
+#include <linux/platform_device.h>
+#include <linux/of_platform.h>
+
+#include "edac_core.h"
+#include "edac_module.h"
+
+#define SR_CLR_SB_ECC_INTR 0x0
+#define SR_CLR_DB_ECC_INTR 0x4
+
+struct hb_l2_drvdata {
+ void __iomem *base;
+ int sb_irq;
+ int db_irq;
+};
+
+static irqreturn_t highbank_l2_err_handler(int irq, void *dev_id)
+{
+ struct edac_device_ctl_info *dci = dev_id;
+ struct hb_l2_drvdata *drvdata = dci->pvt_info;
+
+ if (irq == drvdata->sb_irq) {
+ writel(1, drvdata->base + SR_CLR_SB_ECC_INTR);
+ edac_device_handle_ce(dci, 0, 0, dci->ctl_name);
+ }
+ if (irq == drvdata->db_irq) {
+ writel(1, drvdata->base + SR_CLR_DB_ECC_INTR);
+ edac_device_handle_ue(dci, 0, 0, dci->ctl_name);
+ }
+
+ return IRQ_HANDLED;
+}
+
+static int __devinit highbank_l2_err_probe(struct platform_device *pdev)
+{
+ struct edac_device_ctl_info *dci;
+ struct hb_l2_drvdata *drvdata;
+ struct resource *r;
+ int res = 0;
+
+ dci = edac_device_alloc_ctl_info(sizeof(*drvdata), "cpu",
+ 1, "L", 1, 2, NULL, 0, 0);
+ if (!dci)
+ return -ENOMEM;
+
+ drvdata = dci->pvt_info;
+ dci->dev = &pdev->dev;
+ platform_set_drvdata(pdev, dci);
+
+ if (!devres_open_group(&pdev->dev, NULL, GFP_KERNEL))
+ return -ENOMEM;
+
+ r = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+ if (!r) {
+ dev_err(&pdev->dev, "Unable to get mem resource\n");
+ res = -ENODEV;
+ goto err;
+ }
+
+ if (!devm_request_mem_region(&pdev->dev, r->start,
+ resource_size(r), dev_name(&pdev->dev))) {
+ dev_err(&pdev->dev, "Error while requesting mem region\n");
+ res = -EBUSY;
+ goto err;
+ }
+
+ drvdata->base = devm_ioremap(&pdev->dev, r->start, resource_size(r));
+ if (!drvdata->base) {
+ dev_err(&pdev->dev, "Unable to map regs\n");
+ res = -ENOMEM;
+ goto err;
+ }
+
+ drvdata->db_irq = platform_get_irq(pdev, 0);
+ res = devm_request_irq(&pdev->dev, drvdata->db_irq,
+ highbank_l2_err_handler,
+ 0, dev_name(&pdev->dev), dci);
+ if (res < 0)
+ goto err;
+
+ drvdata->sb_irq = platform_get_irq(pdev, 1);
+ res = devm_request_irq(&pdev->dev, drvdata->sb_irq,
+ highbank_l2_err_handler,
+ 0, dev_name(&pdev->dev), dci);
+ if (res < 0)
+ goto err;
+
+ dci->mod_name = dev_name(&pdev->dev);
+ dci->dev_name = dev_name(&pdev->dev);
+
+ if (edac_device_add_device(dci))
+ goto err;
+
+ devres_close_group(&pdev->dev, NULL);
+ return 0;
+err:
+ devres_release_group(&pdev->dev, NULL);
+ edac_device_free_ctl_info(dci);
+ return res;
+}
+
+static int highbank_l2_err_remove(struct platform_device *pdev)
+{
+ struct edac_device_ctl_info *dci = platform_get_drvdata(pdev);
+
+ edac_device_del_device(&pdev->dev);
+ edac_device_free_ctl_info(dci);
+ return 0;
+}
+
+static const struct of_device_id hb_l2_err_of_match[] = {
+ { .compatible = "calxeda,hb-sregs-l2-ecc", },
+ {},
+};
+MODULE_DEVICE_TABLE(of, hb_l2_err_of_match);
+
+static struct platform_driver highbank_l2_edac_driver = {
+ .probe = highbank_l2_err_probe,
+ .remove = highbank_l2_err_remove,
+ .driver = {
+ .name = "hb_l2_edac",
+ .of_match_table = hb_l2_err_of_match,
+ },
+};
+
+module_platform_driver(highbank_l2_edac_driver);
+
+MODULE_LICENSE("GPL v2");
+MODULE_AUTHOR("Calxeda, Inc.");
+MODULE_DESCRIPTION("EDAC Driver for Calxeda Highbank L2 Cache");