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Subject[PATCH v2 3/6] edac: synopsys: Add EDAC ECC support for ZynqMP DDRC
Date
From: Naga Sureshkumar Relli <naga.sureshkumar.relli@xilinx.com>

This patch adds EDAC ECC support for ZynqMP DDRC IP

Signed-off-by: Naga Sureshkumar Relli <nagasure@xilinx.com>
Signed-off-by: Michal Simek <michal.simek@xilinx.com>
---

Changes in v2:
- Add binding doc to this series to resolve checkpatch warning
- Rebased on the top of
https://git.kernel.org/pub/scm/linux/kernel/git/bp/bp.git/log/?h=for-next
and resolve conflict caused by "EDAC: Get rid of mci->mod_ver" patch
- Add changes done in previous patch

drivers/edac/Kconfig | 2 +-
drivers/edac/synopsys_edac.c | 305 ++++++++++++++++++++++++++++++++++++++++++-
2 files changed, 302 insertions(+), 5 deletions(-)

diff --git a/drivers/edac/Kconfig b/drivers/edac/Kconfig
index 96afb2aeed18..e2f62dda8944 100644
--- a/drivers/edac/Kconfig
+++ b/drivers/edac/Kconfig
@@ -445,7 +445,7 @@ config EDAC_ALTERA_SDMMC

config EDAC_SYNOPSYS
tristate "Synopsys DDR Memory Controller"
- depends on ARCH_ZYNQ
+ depends on ARCH_ZYNQ || ARM64
help
Support for error detection and correction on the Synopsys DDR
memory controller.
diff --git a/drivers/edac/synopsys_edac.c b/drivers/edac/synopsys_edac.c
index 293380f884fe..11016cd13a08 100644
--- a/drivers/edac/synopsys_edac.c
+++ b/drivers/edac/synopsys_edac.c
@@ -22,6 +22,7 @@
#include <linux/edac.h>
#include <linux/module.h>
#include <linux/platform_device.h>
+#include <linux/interrupt.h>
#include <linux/of.h>

#include "edac_module.h"
@@ -99,6 +100,87 @@
/* DDR ECC Quirks */
#define DDR_ECC_INTR_SUPPORT BIT(0)

+/* ZynqMP Enhanced DDR memory controller registers that are relevant to ECC */
+/* ECC Configuration Registers */
+#define ECC_CFG0_OFST 0x70
+#define ECC_CFG1_OFST 0x74
+
+/* ECC Status Register */
+#define ECC_STAT_OFST 0x78
+
+/* ECC Clear Register */
+#define ECC_CLR_OFST 0x7C
+
+/* ECC Error count Register */
+#define ECC_ERRCNT_OFST 0x80
+
+/* ECC Corrected Error Address Register */
+#define ECC_CEADDR0_OFST 0x84
+#define ECC_CEADDR1_OFST 0x88
+
+/* ECC Syndrome Registers */
+#define ECC_CSYND0_OFST 0x8C
+#define ECC_CSYND1_OFST 0x90
+#define ECC_CSYND2_OFST 0x94
+
+/* ECC Bit Mask0 Address Register */
+#define ECC_BITMASK0_OFST 0x98
+#define ECC_BITMASK1_OFST 0x9C
+#define ECC_BITMASK2_OFST 0xA0
+
+/* ECC UnCorrected Error Address Register */
+#define ECC_UEADDR0_OFST 0xA4
+#define ECC_UEADDR1_OFST 0xA8
+
+/* ECC Syndrome Registers */
+#define ECC_UESYND0_OFST 0xAC
+#define ECC_UESYND1_OFST 0xB0
+#define ECC_UESYND2_OFST 0xB4
+
+/* ECC Poison Address Reg */
+#define ECC_POISON0_OFST 0xB8
+#define ECC_POISON1_OFST 0xBC
+
+/* Control register bitfield definitions */
+#define ECC_CTRL_BUSWIDTH_MASK 0x3000
+#define ECC_CTRL_BUSWIDTH_SHIFT 12
+#define ECC_CTRL_CLR_CE_ERRCNT BIT(2)
+#define ECC_CTRL_CLR_UE_ERRCNT BIT(3)
+
+/* DDR Control Register width definitions */
+#define DDRCTL_EWDTH_16 2
+#define DDRCTL_EWDTH_32 1
+#define DDRCTL_EWDTH_64 0
+
+/* ECC status register definitions */
+#define ECC_STAT_UECNT_MASK 0xF0000
+#define ECC_STAT_UECNT_SHIFT 16
+#define ECC_STAT_CECNT_MASK 0xF00
+#define ECC_STAT_CECNT_SHIFT 8
+#define ECC_STAT_BITNUM_MASK 0x7F
+
+/* DDR QOS Interrupt register definitions */
+#define DDR_QOS_IRQ_STAT_OFST 0x20200
+#define DDR_QOSUE_MASK 0x4
+#define DDR_QOSCE_MASK 0x2
+#define ECC_CE_UE_INTR_MASK 0x6
+
+/* ECC Corrected Error Register Mask and Shifts*/
+#define ECC_CEADDR0_RW_MASK 0x3FFFF
+#define ECC_CEADDR0_RNK_MASK BIT(24)
+#define ECC_CEADDR1_BNKGRP_MASK 0x3000000
+#define ECC_CEADDR1_BNKNR_MASK 0x70000
+#define ECC_CEADDR1_BLKNR_MASK 0xFFF
+#define ECC_CEADDR1_BNKGRP_SHIFT 24
+#define ECC_CEADDR1_BNKNR_SHIFT 16
+
+/* DDR Memory type defines */
+#define MEM_TYPE_DDR3 0x1
+#define MEM_TYPE_LPDDR3 0x1
+#define MEM_TYPE_DDR2 0x4
+#define MEM_TYPE_DDR4 0x10
+#define MEM_TYPE_LPDDR4 0x10
+
/**
* struct ecc_error_info - ECC error log information
* @row: Row number
@@ -106,6 +188,8 @@
* @bank: Bank number
* @bitpos: Bit position
* @data: Data causing the error
+ * @bankgrpnr: Bank group number
+ * @blknr: Block number
*/
struct ecc_error_info {
u32 row;
@@ -113,6 +197,8 @@ struct ecc_error_info {
u32 bank;
u32 bitpos;
u32 data;
+ u32 bankgrpnr;
+ u32 blknr;
};

/**
@@ -171,7 +257,7 @@ struct synps_platform_data {
*
* Determines there is any ecc error or not
*
- * Return: one if there is no error otherwise returns zero
+ * Return: 1 if there is no error otherwise returns 0
*/
static int synps_edac_geterror_info(void __iomem *base,
struct synps_ecc_status *p)
@@ -219,6 +305,65 @@ static int synps_edac_geterror_info(void __iomem *base,
}

/**
+ * synps_enh_edac_geterror_info - Get the current ecc error info
+ * @base: Pointer to the base address of the ddr memory controller
+ * @p: Pointer to the synopsys ecc status structure
+ *
+ * Determines there is any ecc error or not
+ *
+ * Return: one if there is no error otherwise returns zero
+ */
+static int synps_enh_edac_geterror_info(void __iomem *base,
+ struct synps_ecc_status *p)
+{
+ u32 regval, clearval = 0;
+
+ regval = readl(base + ECC_STAT_OFST);
+ if (!regval)
+ return 1;
+
+ p->ce_cnt = (regval & ECC_STAT_CECNT_MASK) >> ECC_STAT_CECNT_SHIFT;
+ p->ue_cnt = (regval & ECC_STAT_UECNT_MASK) >> ECC_STAT_UECNT_SHIFT;
+ p->ceinfo.bitpos = (regval & ECC_STAT_BITNUM_MASK);
+
+ regval = readl(base + ECC_CEADDR0_OFST);
+ if (!(p->ce_cnt))
+ goto ue_err;
+
+ p->ceinfo.row = (regval & ECC_CEADDR0_RW_MASK);
+ regval = readl(base + ECC_CEADDR1_OFST);
+ p->ceinfo.bank = (regval & ECC_CEADDR1_BNKNR_MASK) >>
+ ECC_CEADDR1_BNKNR_SHIFT;
+ p->ceinfo.bankgrpnr = (regval & ECC_CEADDR1_BNKGRP_MASK) >>
+ ECC_CEADDR1_BNKGRP_SHIFT;
+ p->ceinfo.blknr = (regval & ECC_CEADDR1_BLKNR_MASK);
+ p->ceinfo.data = readl(base + ECC_CSYND0_OFST);
+ edac_dbg(3, "ce bit position: %d data: %d\n", p->ceinfo.bitpos,
+ p->ceinfo.data);
+
+ue_err:
+ regval = readl(base + ECC_UEADDR0_OFST);
+ if (!(p->ue_cnt))
+ goto out;
+
+ p->ueinfo.row = (regval & ECC_CEADDR0_RW_MASK);
+ regval = readl(base + ECC_UEADDR1_OFST);
+ p->ueinfo.bankgrpnr = (regval & ECC_CEADDR1_BNKGRP_MASK) >>
+ ECC_CEADDR1_BNKGRP_SHIFT;
+ p->ueinfo.bank = (regval & ECC_CEADDR1_BNKNR_MASK) >>
+ ECC_CEADDR1_BNKNR_SHIFT;
+ p->ueinfo.blknr = (regval & ECC_CEADDR1_BLKNR_MASK);
+ p->ueinfo.data = readl(base + ECC_UESYND0_OFST);
+out:
+ clearval = ECC_CTRL_CLR_CE_ERR | ECC_CTRL_CLR_CE_ERRCNT;
+ clearval |= ECC_CTRL_CLR_UE_ERR | ECC_CTRL_CLR_UE_ERRCNT;
+ writel(clearval, base + ECC_CLR_OFST);
+ writel(0x0, base + ECC_CLR_OFST);
+
+ return 0;
+}
+
+/**
* synps_edac_handle_error - Handle controller error types CE and UE
* @mci: Pointer to the edac memory controller instance
* @p: Pointer to the synopsys ecc status structure
@@ -255,6 +400,41 @@ static void synps_edac_handle_error(struct mem_ctl_info *mci,
}

/**
+ * synps_edac_intr_handler - synps edac isr
+ * @irq: irq number
+ * @dev_id: device id poniter
+ *
+ * This is the Isr routine called by edac core interrupt thread.
+ * Used to check and post ECC errors.
+ *
+ * Return: IRQ_NONE, if interrupt not set or IRQ_HANDLED otherwise
+ */
+static irqreturn_t synps_edac_intr_handler(int irq, void *dev_id)
+{
+ struct mem_ctl_info *mci = dev_id;
+ struct synps_edac_priv *priv = mci->pvt_info;
+ int status, regval;
+
+ regval = readl(priv->baseaddr + DDR_QOS_IRQ_STAT_OFST) &
+ (DDR_QOSCE_MASK | DDR_QOSUE_MASK);
+ if (!(regval & ECC_CE_UE_INTR_MASK))
+ return IRQ_NONE;
+ status = priv->p_data->edac_geterror_info(priv->baseaddr,
+ &priv->stat);
+ if (status)
+ return IRQ_NONE;
+
+ priv->ce_cnt += priv->stat.ce_cnt;
+ priv->ue_cnt += priv->stat.ue_cnt;
+ synps_edac_handle_error(mci, &priv->stat);
+
+ edac_dbg(3, "Total error count ce %d ue %d\n",
+ priv->ce_cnt, priv->ue_cnt);
+ writel(regval, priv->baseaddr + DDR_QOS_IRQ_STAT_OFST);
+ return IRQ_HANDLED;
+}
+
+/**
* synps_edac_check - Check controller for ECC errors
* @mci: Pointer to the edac memory controller instance
*
@@ -310,6 +490,40 @@ static enum dev_type synps_edac_get_dtype(const void __iomem *base)
}

/**
+ * synps_enh_edac_get_dtype - Return the controller memory width
+ * @base: Pointer to the ddr memory controller base address
+ *
+ * Get the EDAC device type width appropriate for the current controller
+ * configuration.
+ *
+ * Return: a device type width enumeration.
+ */
+static enum dev_type synps_enh_edac_get_dtype(const void __iomem *base)
+{
+ enum dev_type dt;
+ u32 width;
+
+ width = readl(base + CTRL_OFST);
+ width = (width & ECC_CTRL_BUSWIDTH_MASK) >>
+ ECC_CTRL_BUSWIDTH_SHIFT;
+ switch (width) {
+ case DDRCTL_EWDTH_16:
+ dt = DEV_X2;
+ break;
+ case DDRCTL_EWDTH_32:
+ dt = DEV_X4;
+ break;
+ case DDRCTL_EWDTH_64:
+ dt = DEV_X8;
+ break;
+ default:
+ dt = DEV_UNKNOWN;
+ }
+
+ return dt;
+}
+
+/**
* synps_edac_get_eccstate - Return the controller ecc enable/disable status
* @base: Pointer to the ddr memory controller base address
*
@@ -335,6 +549,32 @@ static bool synps_edac_get_eccstate(void __iomem *base)
}

/**
+ * synps_enh_edac_get_eccstate - Return the controller ecc enable/disable status
+ * @base: Pointer to the ddr memory controller base address
+ *
+ * Get the ECC enable/disable status for the controller
+ *
+ * Return: a ecc status boolean i.e true/false - enabled/disabled.
+ */
+static bool synps_enh_edac_get_eccstate(void __iomem *base)
+{
+ enum dev_type dt;
+ u32 ecctype;
+ bool state = false;
+
+ dt = synps_enh_edac_get_dtype(base);
+ if (dt == DEV_UNKNOWN)
+ return state;
+
+ ecctype = readl(base + ECC_CFG0_OFST) & SCRUB_MODE_MASK;
+ if ((ecctype == SCRUB_MODE_SECDED) &&
+ ((dt == DEV_X2) || (dt == DEV_X4) || (dt == DEV_X8)))
+ state = true;
+
+ return state;
+}
+
+/**
* synps_edac_get_memsize - reads the size of the attached memory device
*
* Return: the memory size in bytes
@@ -373,6 +613,32 @@ static enum mem_type synps_edac_get_mtype(const void __iomem *base)
}

/**
+ * synps_enh_edac_get_mtype - Returns controller memory type
+ * @base: pointer to the synopsys ecc status structure
+ *
+ * Get the EDAC memory type appropriate for the current controller
+ * configuration.
+ *
+ * Return: a memory type enumeration.
+ */
+static enum mem_type synps_enh_edac_get_mtype(const void __iomem *base)
+{
+ enum mem_type mt = MEM_UNKNOWN;
+ u32 memtype;
+
+ memtype = readl(base + CTRL_OFST);
+
+ if ((memtype & MEM_TYPE_DDR3) || (memtype & MEM_TYPE_LPDDR3))
+ mt = MEM_DDR3;
+ else if (memtype & MEM_TYPE_DDR2)
+ mt = MEM_RDDR2;
+ else if ((memtype & MEM_TYPE_LPDDR4) || (memtype & MEM_TYPE_DDR4))
+ mt = MEM_DDR4;
+
+ return mt;
+}
+
+/**
* synps_edac_init_csrows - Initialize the cs row data
* @mci: Pointer to the edac memory controller instance
*
@@ -440,8 +706,12 @@ static int synps_edac_mc_init(struct mem_ctl_info *mci,
mci->dev_name = SYNPS_EDAC_MOD_STRING;
mci->mod_name = SYNPS_EDAC_MOD_VER;

- edac_op_state = EDAC_OPSTATE_POLL;
- mci->edac_check = synps_edac_check;
+ if (priv->p_data->quirks & DDR_ECC_INTR_SUPPORT) {
+ edac_op_state = EDAC_OPSTATE_INT;
+ } else {
+ edac_op_state = EDAC_OPSTATE_POLL;
+ mci->edac_check = synps_edac_check;
+ }
mci->ctl_page_to_phys = NULL;

status = synps_edac_init_csrows(mci);
@@ -457,8 +727,18 @@ static int synps_edac_mc_init(struct mem_ctl_info *mci,
.quirks = 0,
};

+static const struct synps_platform_data zynqmp_enh_edac_def = {
+ .edac_geterror_info = synps_enh_edac_geterror_info,
+ .edac_get_mtype = synps_enh_edac_get_mtype,
+ .edac_get_dtype = synps_enh_edac_get_dtype,
+ .edac_get_eccstate = synps_enh_edac_get_eccstate,
+ .quirks = DDR_ECC_INTR_SUPPORT,
+};
+
static const struct of_device_id synps_edac_match[] = {
{ .compatible = "xlnx,zynq-ddrc-a05", .data = (void *)&zynq_edac_def },
+ { .compatible = "xlnx,zynqmp-ddrc-2.40a",
+ .data = (void *)&zynqmp_enh_edac_def},
{ /* end of table */ }
};

@@ -478,7 +758,7 @@ static int synps_edac_mc_probe(struct platform_device *pdev)
struct mem_ctl_info *mci;
struct edac_mc_layer layers[2];
struct synps_edac_priv *priv;
- int rc;
+ int rc, irq, status;
struct resource *res;
void __iomem *baseaddr;
const struct of_device_id *match;
@@ -527,6 +807,23 @@ static int synps_edac_mc_probe(struct platform_device *pdev)
goto free_edac_mc;
}

+ if (priv->p_data->quirks & DDR_ECC_INTR_SUPPORT) {
+ irq = platform_get_irq(pdev, 0);
+ if (irq < 0) {
+ edac_printk(KERN_ERR, EDAC_MC,
+ "No irq %d in DT\n", irq);
+ return -ENODEV;
+ }
+
+ status = devm_request_irq(&pdev->dev, irq,
+ synps_edac_intr_handler,
+ 0, dev_name(&pdev->dev), mci);
+ if (status < 0) {
+ edac_printk(KERN_ERR, EDAC_MC, "Failed to request Irq\n");
+ goto free_edac_mc;
+ }
+ }
+
rc = edac_mc_add_mc(mci);
if (rc) {
edac_printk(KERN_ERR, EDAC_MC,
--
1.9.1
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