From: Thor Thayer <ttha...@opensource.altera.com>
This patch adds support for the CycloneV and ArriaV SDRAM controllers.
Correction and reporting of SBEs, Panic on DBEs.
Signed-off-by: Thor Thayer <ttha...@opensource.altera.com>
---
v2: Use the SDRAM controller registers to calculate memory size
instead of the Device Tree. Update To & Cc list. Add maintainer
information.
v3: EDAC driver cleanup based on comments from Mailing list.
v4: Panic on DBE. Add macro around inject-error reads to prevent
them from being optimized out. Remove of_match_ptr since this
will always use Device Tree.
v5: Addition of printk to trigger function to ensure read vars
are not optimized out.
v6: Changes to split out shared SDRAM controller reg (offset 0x00)
as a syscon device and allocate ECC specific SDRAM registers
to EDAC.
v7: No changes. Bump for consistency.
v8: Alphabetize headers.
v9: Move Altera EDAC driver to use SDRAM MFD device since controller
registers are shared between different drivers.
---
MAINTAINERS | 1 +
drivers/edac/Kconfig | 10 ++
drivers/edac/Makefile | 2 +
drivers/edac/altera_edac.c | 293 ++++++++++++++++++++++++++++++++++++++++++++
4 files changed, 306 insertions(+)
create mode 100644 drivers/edac/altera_edac.c
diff --git a/MAINTAINERS b/MAINTAINERS
index 48a8923..7fde28b 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -1344,6 +1344,7 @@ ARM/SOCFPGA SDRAM CONTROLLER SUPPORT
M: Thor Thayer <ttha...@altera.com>
S: Maintained
F: drivers/mfd/altera-sdr.c
+F: drivers/edac/altera_edac.c
ARM/STI ARCHITECTURE
M: Srinivas Kandagatla <srinivas.kandaga...@gmail.com>
diff --git a/drivers/edac/Kconfig b/drivers/edac/Kconfig
index 878f090..429e244 100644
--- a/drivers/edac/Kconfig
+++ b/drivers/edac/Kconfig
@@ -368,4 +368,14 @@ config EDAC_OCTEON_PCI
Support for error detection and correction on the
Cavium Octeon family of SOCs.
+config EDAC_ALTERA_MC
+ bool "Altera SDRAM Memory Controller EDAC"
+ depends on EDAC_MM_EDAC && ARCH_SOCFPGA
+ select MFD_ALTERA_SDR
+ help
+ Support for error detection and correction on the
+ Altera SDRAM memory controller. Note that the
+ preloader must initialize the SDRAM before loading
+ the kernel.
+
endif # EDAC
diff --git a/drivers/edac/Makefile b/drivers/edac/Makefile
index 4154ed6..70845c4 100644
--- a/drivers/edac/Makefile
+++ b/drivers/edac/Makefile
@@ -64,3 +64,5 @@ obj-$(CONFIG_EDAC_OCTEON_PC) += octeon_edac-pc.o
obj-$(CONFIG_EDAC_OCTEON_L2C) += octeon_edac-l2c.o
obj-$(CONFIG_EDAC_OCTEON_LMC) += octeon_edac-lmc.o
obj-$(CONFIG_EDAC_OCTEON_PCI) += octeon_edac-pci.o
+
+obj-$(CONFIG_EDAC_ALTERA_MC) += altera_edac.o
diff --git a/drivers/edac/altera_edac.c b/drivers/edac/altera_edac.c
new file mode 100644
index 0000000..602ae62
--- /dev/null
+++ b/drivers/edac/altera_edac.c
@@ -0,0 +1,293 @@
+/*
+ * Copyright Altera Corporation (C) 2014. All rights reserved.
+ * 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/>.
+ *
+ * Adapted from the highbank_mc_edac driver.
+ */
+
+#include <linux/ctype.h>
+#include <linux/edac.h>
+#include <linux/interrupt.h>
+#include <linux/kernel.h>
+#include <linux/mfd/altera-sdr.h>
+#include <linux/of_platform.h>
+#include <linux/platform_device.h>
+#include <linux/types.h>
+#include <linux/uaccess.h>
+#include "edac_core.h"
+#include "edac_module.h"
+
+#define EDAC_MOD_STR "altera_edac"
+#define EDAC_VERSION "1"
+
+/* Altera SDRAM Memory Controller data */
+struct altr_sdram_mc_data {
+ struct altera_sdr *sdr;
+};
+
+static irqreturn_t altr_sdram_mc_err_handler(int irq, void *dev_id)
+{
+ struct mem_ctl_info *mci = dev_id;
+ struct altr_sdram_mc_data *drvdata = mci->pvt_info;
+ u32 status, err_count, err_addr;
+
+ /* Error Address is shared by both SBE & DBE */
+ err_addr = altera_sdr_readl(drvdata->sdr, SDR_ERRADDR_OFST);
+ status = altera_sdr_readl(drvdata->sdr, SDR_DRAMSTS_OFST);
+
+ if (status & SDR_DRAMSTS_DBEERR) {
+ err_count = altera_sdr_readl(drvdata->sdr, SDR_DBECOUNT_OFST);
+ panic("\nEDAC: [%d Uncorrectable errors @ 0x%08X]\n",
+ err_count, err_addr);
+ }
+ if (status & SDR_DRAMSTS_SBEERR) {
+ err_count = altera_sdr_readl(drvdata->sdr, SDR_SBECOUNT_OFST);
+ edac_mc_handle_error(HW_EVENT_ERR_CORRECTED, mci, err_count,
+ err_addr >> PAGE_SHIFT,
+ err_addr & ~PAGE_MASK, 0,
+ 0, 0, -1, mci->ctl_name, "");
+ }
+
+ altera_sdr_writel(drvdata->sdr,
+ SDR_DRAMINTR_OFST,
+ SDR_DRAMINTR_INTRCLR | SDR_DRAMINTR_INTREN);
+
+ return IRQ_HANDLED;
+}
+
+#ifdef CONFIG_EDAC_DEBUG
+static ssize_t altr_sdr_mc_err_inject_write(struct file *file,
+ const char __user *data,
+ size_t count, loff_t *ppos)
+{
+ struct mem_ctl_info *mci = file->private_data;
+ struct altr_sdram_mc_data *drvdata = mci->pvt_info;
+ u32 *ptemp;
+ dma_addr_t dma_handle;
+ u32 reg, read_reg;
+
+ mci->pdev->coherent_dma_mask = ~0;
+ ptemp = dma_alloc_coherent(mci->pdev, 16, &dma_handle, GFP_KERNEL);
+
+ if (!ptemp) {
+ edac_printk(KERN_ERR, EDAC_MC,
+ "Inject: Buffer Allocation error\n");
+ return -ENOMEM;
+ }
+
+ read_reg = altera_sdr_readl(drvdata->sdr, SDR_CTLCFG_OFST);
+ read_reg &= ~(SDR_CTLCFG_GEN_SB_ERR | SDR_CTLCFG_GEN_DB_ERR);
+
+ /* Error are injected by writing a word while the SBE or DBE
+ * bit in the CTLCFG register is set. Reading the word will
+ * trigger the SBE or DBE error and the corresponding IRQ.
+ */
+ if (count == 3) {
+ edac_printk(KERN_ALERT, EDAC_MC,
+ "Inject Double bit error\n");
+ altera_sdr_writel(drvdata->sdr, SDR_CTLCFG_OFST,
+ (read_reg | SDR_CTLCFG_GEN_DB_ERR));
+ } else {
+ edac_printk(KERN_ALERT, EDAC_MC,
+ "Inject Single bit error\n");
+ altera_sdr_writel(drvdata->sdr, SDR_CTLCFG_OFST,
+ (read_reg | SDR_CTLCFG_GEN_SB_ERR));
+ }
+
+ ptemp[0] = 0x5A5A5A5A;
+ ptemp[1] = 0xA5A5A5A5;
+
+ /* Clear the error injection bits */
+ altera_sdr_writel(drvdata->sdr, SDR_CTLCFG_OFST, read_reg);
+ /* Ensure it has been written out */
+ wmb();
+
+ /*
+ * To trigger the error, we need to read the data back
+ * (the data was written with errors above).
+ * The ACCESS_ONCE macros and printk are used to prevent the
+ * the compiler optimizing these reads out.
+ */
+ reg = ACCESS_ONCE(ptemp[0]);
+ read_reg = ACCESS_ONCE(ptemp[1]);
+ /* Force Read */
+ rmb();
+
+ edac_printk(KERN_ALERT, EDAC_MC, "Read Data [0x%X, 0x%X]\n",
+ reg, read_reg);
+
+ dma_free_coherent(mci->pdev, 16, ptemp, dma_handle);
+
+ return count;
+}
+
+static const struct file_operations altr_sdr_mc_debug_inject_fops = {
+ .open = simple_open,
+ .write = altr_sdr_mc_err_inject_write,
+ .llseek = generic_file_llseek,
+};
+
+static void altr_sdr_mc_create_debugfs_nodes(struct mem_ctl_info *mci)
+{
+ if (mci->debugfs)
+ debugfs_create_file("inject_ctrl", S_IWUSR, mci->debugfs, mci,
+ &altr_sdr_mc_debug_inject_fops);
+}
+#else
+static void altr_sdr_mc_create_debugfs_nodes(struct mem_ctl_info *mci)
+{}
+#endif
+
+static int altr_sdram_probe(struct platform_device *pdev)
+{
+ struct altera_sdr *sdr = dev_get_drvdata(pdev->dev.parent);
+ struct edac_mc_layer layers[2];
+ struct mem_ctl_info *mci;
+ struct altr_sdram_mc_data *drvdata;
+ struct dimm_info *dimm;
+ u32 read_reg, mem_size;
+ int irq;
+ int res = 0;
+
+ /* Validate the SDRAM controller has ECC enabled */
+ read_reg = altera_sdr_readl(sdr, SDR_CTLCFG_OFST);
+ if ((read_reg & SDR_CTLCFG_ECC_AUTO_EN) != SDR_CTLCFG_ECC_AUTO_EN) {
+ edac_printk(KERN_ERR, EDAC_MC,
+ "No ECC/ECC disabled [0x%08X]\n", read_reg);
+ return -ENODEV;
+ }
+
+ /* Grab memory size from device tree. */
+ mem_size = altera_sdr_mem_size(sdr);
+ edac_printk(KERN_DEBUG, EDAC_MC, "Memory Size = 0x%08x\n", mem_size);
+ if (mem_size <= 0) {
+ edac_printk(KERN_ERR, EDAC_MC,
+ "Unable to calculate memory size\n");
+ return -ENODEV;
+ }
+
+ /* Ensure the SDRAM Interrupt is disabled and cleared */
+ altera_sdr_writel(sdr, SDR_DRAMINTR_OFST, SDR_DRAMINTR_INTRCLR);
+
+ irq = platform_get_irq(pdev, 0);
+ if (irq < 0) {
+ edac_printk(KERN_ERR, EDAC_MC,
+ "No irq %d in DT\n", irq);
+ return -ENODEV;
+ }
+
+ layers[0].type = EDAC_MC_LAYER_CHIP_SELECT;
+ layers[0].size = 1;
+ 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(0, ARRAY_SIZE(layers), layers,
+ sizeof(struct altr_sdram_mc_data));
+ if (!mci)
+ return -ENOMEM;
+
+ mci->pdev = &pdev->dev;
+ drvdata = mci->pvt_info;
+ drvdata->sdr = sdr;
+ platform_set_drvdata(pdev, mci);
+
+ if (!devres_open_group(&pdev->dev, NULL, GFP_KERNEL)) {
+ res = -ENOMEM;
+ goto free;
+ }
+
+ mci->mtype_cap = MEM_FLAG_DDR3;
+ 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 = EDAC_VERSION;
+ mci->ctl_name = dev_name(&pdev->dev);
+ mci->scrub_mode = SCRUB_SW_SRC;
+ mci->dev_name = dev_name(&pdev->dev);
+
+ dimm = *mci->dimms;
+ dimm->nr_pages = ((mem_size - 1) >> PAGE_SHIFT) + 1;
+ dimm->grain = 8;
+ dimm->dtype = DEV_X8;
+ dimm->mtype = MEM_DDR3;
+ dimm->edac_mode = EDAC_SECDED;
+
+ res = edac_mc_add_mc(mci);
+ if (res < 0)
+ goto err;
+
+ res = devm_request_irq(&pdev->dev, irq, altr_sdram_mc_err_handler,
+ 0, dev_name(&pdev->dev), mci);
+ if (res < 0) {
+ edac_mc_printk(mci, KERN_ERR,
+ "Unable to request irq %d\n", irq);
+ res = -ENODEV;
+ goto err2;
+ }
+
+ altera_sdr_writel(drvdata->sdr,
+ SDR_DRAMINTR_OFST,
+ SDR_DRAMINTR_INTRCLR | SDR_DRAMINTR_INTREN);
+
+ altr_sdr_mc_create_debugfs_nodes(mci);
+
+ devres_close_group(&pdev->dev, NULL);
+
+ return 0;
+
+err2:
+ edac_mc_del_mc(&pdev->dev);
+err:
+ devres_release_group(&pdev->dev, NULL);
+free:
+ edac_mc_free(mci);
+ edac_printk(KERN_ERR, EDAC_MC,
+ "EDAC Probe Failed; Error %d\n", res);
+
+ return res;
+}
+
+static int altr_sdram_remove(struct platform_device *pdev)
+{
+ struct mem_ctl_info *mci = platform_get_drvdata(pdev);
+
+ edac_mc_del_mc(&pdev->dev);
+ edac_mc_free(mci);
+ platform_set_drvdata(pdev, NULL);
+
+ return 0;
+}
+
+static const struct of_device_id altr_sdram_ctrl_of_match[] = {
+ { .compatible = "altr,sdram-edac", },
+ {},
+};
+MODULE_DEVICE_TABLE(of, altr_sdram_ctrl_of_match);
+
+static struct platform_driver altr_sdram_edac_driver = {
+ .probe = altr_sdram_probe,
+ .remove = altr_sdram_remove,
+ .driver = {
+ .name = "altr_sdram_edac",
+ .of_match_table = altr_sdram_ctrl_of_match,
+ },
+};
+
+module_platform_driver(altr_sdram_edac_driver);
+
+MODULE_LICENSE("GPL v2");
+MODULE_AUTHOR("Altera Corporation");
+MODULE_DESCRIPTION("EDAC Driver for Altera SDRAM Controller");
--
1.7.9.5
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