text: /*
   * 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_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 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 int highbank_l2_err_probe(struct platform_device *pdev)
  {
  	const struct of_device_id *id;
  	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;
  	}
  
  	id = of_match_device(hb_l2_err_of_match, &pdev->dev);
  	dci->mod_name = pdev->dev.driver->name;
  	dci->ctl_name = id ? id->compatible : "unknown";
  	dci->dev_name = dev_name(&pdev->dev);
  
  	if (edac_device_add_device(dci))
  		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 err2;
  
  	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 err2;
  
  	devres_close_group(&pdev->dev, NULL);
  	return 0;
  err2:
  	edac_device_del_device(&pdev->dev);
  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 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");
  