arch/arm/mach-socfpga/ocram.c

   1 /*
   2  * Copyright Altera Corporation (C) 2016. All rights reserved.
   3  *
   4  * This program is free software; you can redistribute it and/or modify it
   5  * under the terms and conditions of the GNU General Public License,
   6  * version 2, as published by the Free Software Foundation.
   7  *
   8  * This program is distributed in the hope it will be useful, but WITHOUT
   9  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  10  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
  11  * more details.
  12  *
  13  * You should have received a copy of the GNU General Public License along with
  14  * this program.  If not, see <http://www.gnu.org/licenses/>.
  15  */
  16 #include <linux/io.h>
  17 #include <linux/genalloc.h>
  18 #include <linux/module.h>
  19 #include <linux/of_address.h>
  20 #include <linux/of_platform.h>
  21
  22 #define ALTR_OCRAM_CLEAR_ECC          0x00000018
  23 #define ALTR_OCRAM_ECC_EN             0x00000019
  24
  25 void socfpga_init_ocram_ecc(void)
  26 {
  27         struct device_node *np;
  28         void __iomem *mapped_ocr_edac_addr;
  29
  30         /* Find the OCRAM EDAC device tree node */
  31         np = of_find_compatible_node(NULL, NULL, "altr,socfpga-ocram-ecc");
  32         if (!np) {
  33                 pr_err("Unable to find socfpga-ocram-ecc\n");
  34                 return;
  35         }
  36
  37         mapped_ocr_edac_addr = of_iomap(np, 0);
  38         of_node_put(np);
  39         if (!mapped_ocr_edac_addr) {
  40                 pr_err("Unable to map OCRAM ecc regs.\n");
  41                 return;
  42         }
  43
  44         /* Clear any pending OCRAM ECC interrupts, then enable ECC */
  45         writel(ALTR_OCRAM_CLEAR_ECC, mapped_ocr_edac_addr);
  46         writel(ALTR_OCRAM_ECC_EN, mapped_ocr_edac_addr);
  47
  48         iounmap(mapped_ocr_edac_addr);
  49 }