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SubjectRE: [PATCH 2/3] soc: sifive: beu: Add support for SiFive Bus Error Unit
Date
Any updates on this patch?

- Yash

> -----Original Message-----
> From: Yash Shah <yash.shah@openfive.com>
> Sent: 12 November 2020 17:31
> To: robh+dt@kernel.org; Paul Walmsley ( Sifive)
> <paul.walmsley@sifive.com>; palmer@dabbelt.com; bp@alien8.de;
> mchehab@kernel.org; tony.luck@intel.com; james.morse@arm.com;
> rric@kernel.org
> Cc: aou@eecs.berkeley.edu; devicetree@vger.kernel.org; linux-
> riscv@lists.infradead.org; linux-kernel@vger.kernel.org; linux-
> edac@vger.kernel.org; Sachin Ghadi <sachin.ghadi@openfive.com>; Yash
> Shah <yash.shah@openfive.com>
> Subject: [PATCH 2/3] soc: sifive: beu: Add support for SiFive Bus Error Unit
>
> Add driver support for Bus Error Unit present in SiFive's FU740 chip.
> Currently the driver reports erroneous events only using Platform-level
> interrupts. The support for reporting events using hart-local interrupts can
> be added in future.
>
> Signed-off-by: Yash Shah <yash.shah@sifive.com>
> ---
> drivers/soc/sifive/Kconfig | 5 +
> drivers/soc/sifive/Makefile | 1 +
> drivers/soc/sifive/sifive_beu.c | 197
> ++++++++++++++++++++++++++++++++++++++++
> include/soc/sifive/sifive_beu.h | 16 ++++
> 4 files changed, 219 insertions(+)
> create mode 100644 drivers/soc/sifive/sifive_beu.c create mode 100644
> include/soc/sifive/sifive_beu.h
>
> diff --git a/drivers/soc/sifive/Kconfig b/drivers/soc/sifive/Kconfig index
> 58cf8c4..d575fc1 100644
> --- a/drivers/soc/sifive/Kconfig
> +++ b/drivers/soc/sifive/Kconfig
> @@ -7,4 +7,9 @@ config SIFIVE_L2
> help
> Support for the L2 cache controller on SiFive platforms.
>
> +config SIFIVE_BEU
> + bool "Sifive Bus Error Unit"
> + help
> + Support for the Bus Error Unit on SiFive platforms.
> +
> endif
> diff --git a/drivers/soc/sifive/Makefile b/drivers/soc/sifive/Makefile index
> b5caff7..1b43ecd 100644
> --- a/drivers/soc/sifive/Makefile
> +++ b/drivers/soc/sifive/Makefile
> @@ -1,3 +1,4 @@
> # SPDX-License-Identifier: GPL-2.0
>
> obj-$(CONFIG_SIFIVE_L2) += sifive_l2_cache.o
> +obj-$(CONFIG_SIFIVE_BEU) += sifive_beu.o
> diff --git a/drivers/soc/sifive/sifive_beu.c b/drivers/soc/sifive/sifive_beu.c
> new file mode 100644 index 0000000..87b69ba
> --- /dev/null
> +++ b/drivers/soc/sifive/sifive_beu.c
> @@ -0,0 +1,197 @@
> +// SPDX-License-Identifier: GPL-2.0
> +/*
> + * SiFive Bus Error Unit driver
> + * Copyright (C) 2020 SiFive
> + * Author: Yash Shah <yash.shah@sifive.com>
> + *
> + */
> +
> +#include <linux/module.h>
> +#include <linux/platform_device.h>
> +#include <linux/of_platform.h>
> +#include <linux/interrupt.h>
> +#include <linux/io.h>
> +#include <soc/sifive/sifive_beu.h>
> +
> +#define SIFIVE_BEU_CAUSE 0x00
> +#define SIFIVE_BEU_VALUE 0x08
> +#define SIFIVE_BEU_ENABLE 0x10
> +#define SIFIVE_BEU_PLIC_INTR 0x18
> +#define SIFIVE_BEU_ACCRUED 0x20
> +#define SIFIVE_BEU_LOCAL_INTR 0x28
> +
> +#define LOCAL_INTERRUPT 0
> +#define PLIC_INTERRUPT 1
> +#define MAX_ERR_EVENTS 5
> +
> +enum beu_err_events {
> + RESERVED = -1,
> + NO_ERR,
> + ITIM_CORR_ECC = 2,
> + ITIM_UNCORR_ECC,
> + TILINKBUS_ERR = 5,
> + DCACHE_CORR_ECC,
> + DCACHE_UNCORR_ECC
> +};
> +
> +static
> +int err_events[MAX_ERR_EVENTS] = {ITIM_CORR_ECC, ITIM_UNCORR_ECC,
> TILINKBUS_ERR,
> + DCACHE_CORR_ECC,
> DCACHE_UNCORR_ECC};
> +
> +struct beu_sifive_ddata {
> + void __iomem *regs;
> + int irq;
> +};
> +
> +static int beu_enable_event(struct beu_sifive_ddata *ddata,
> + int event, int intr_type)
> +{
> + unsigned char event_mask = BIT(event), val;
> +
> + val = readb(ddata->regs + SIFIVE_BEU_ENABLE);
> + val |= event_mask;
> + writeb(val, ddata->regs + SIFIVE_BEU_ENABLE);
> +
> + if (intr_type == PLIC_INTERRUPT) {
> + val = readb(ddata->regs + SIFIVE_BEU_PLIC_INTR);
> + val |= event_mask;
> + writeb(val, ddata->regs + SIFIVE_BEU_PLIC_INTR);
> + } else if (intr_type == LOCAL_INTERRUPT) {
> + val = readb(ddata->regs + SIFIVE_BEU_LOCAL_INTR);
> + val |= event_mask;
> + writeb(event_mask, ddata->regs + SIFIVE_BEU_LOCAL_INTR);
> + }
> +
> + return 0;
> +}
> +
> +static ATOMIC_NOTIFIER_HEAD(beu_chain);
> +
> +int register_sifive_beu_error_notifier(struct notifier_block *nb) {
> + return atomic_notifier_chain_register(&beu_chain, nb); }
> +
> +int unregister_sifive_beu_error_notifier(struct notifier_block *nb) {
> + return atomic_notifier_chain_unregister(&beu_chain, nb); }
> +
> +static irqreturn_t beu_sifive_irq(int irq, void *data) {
> + struct beu_sifive_ddata *ddata = data;
> + unsigned char cause, addr;
> +
> + addr = readb(ddata->regs + SIFIVE_BEU_VALUE);
> + cause = readb(ddata->regs + SIFIVE_BEU_CAUSE);
> + switch (cause) {
> + case NO_ERR:
> + break;
> + case ITIM_CORR_ECC:
> + pr_err("BEU: ITIM ECCFIX @ %d\n", addr);
> + atomic_notifier_call_chain(&beu_chain,
> SIFIVE_BEU_ERR_TYPE_CE,
> + "ITIM ECCFIX");
> + break;
> + case ITIM_UNCORR_ECC:
> + pr_err("BEU: ITIM ECCFAIL @ %d\n", addr);
> + atomic_notifier_call_chain(&beu_chain,
> SIFIVE_BEU_ERR_TYPE_UE,
> + "ITIM ECCFAIL");
> + break;
> + case TILINKBUS_ERR:
> + pr_err("BEU: Load or Store TILINK BUS ERR occurred\n");
> + break;
> + case DCACHE_CORR_ECC:
> + pr_err("BEU: DATACACHE ECCFIX @ %d\n", addr);
> + atomic_notifier_call_chain(&beu_chain,
> SIFIVE_BEU_ERR_TYPE_CE,
> + "DCACHE ECCFIX");
> + break;
> + case DCACHE_UNCORR_ECC:
> + pr_err("BEU: DATACACHE ECCFAIL @ %d\n", addr);
> + atomic_notifier_call_chain(&beu_chain,
> SIFIVE_BEU_ERR_TYPE_UE,
> + "DCACHE ECCFAIL");
> + break;
> + default:
> + pr_err("BEU: Unidentified cause\n");
> + break;
> + }
> + writeb(0, ddata->regs + SIFIVE_BEU_CAUSE);
> + writeb(0, ddata->regs + SIFIVE_BEU_ACCRUED);
> +
> + return IRQ_HANDLED;
> +}
> +
> +static int beu_sifive_probe(struct platform_device *pdev) {
> + struct device *dev = &pdev->dev;
> + struct beu_sifive_ddata *ddata;
> + struct resource *res;
> + int ret, i;
> +
> + ddata = devm_kzalloc(dev, sizeof(*ddata), GFP_KERNEL);
> + if (!ddata)
> + return -ENOMEM;
> +
> + res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
> + ddata->regs = devm_ioremap_resource(dev, res);
> + if (IS_ERR(ddata->regs)) {
> + dev_err(dev, "Unable to map IO resources\n");
> + return PTR_ERR(ddata->regs);
> + }
> +
> + ddata->irq = platform_get_irq(pdev, 0);
> + if (ddata->irq < 0) {
> + dev_err(dev, "Unable to find interrupt\n");
> + ret = ddata->irq;
> + return ret;
> + }
> +
> + ret = devm_request_irq(dev, ddata->irq, beu_sifive_irq, 0,
> + dev_name(dev), ddata);
> + if (ret) {
> + dev_err(dev, "Unable to request IRQ\n");
> + return ret;
> + }
> +
> + for (i = 0; i < MAX_ERR_EVENTS; i++) {
> + ret = beu_enable_event(ddata, err_events[i],
> PLIC_INTERRUPT);
> + if (ret) {
> + dev_err(dev, "Unable to register PLIC interrupt\n");
> + return ret;
> + }
> + }
> +
> + platform_set_drvdata(pdev, ddata);
> +
> + return 0;
> +}
> +
> +static int beu_sifive_remove(struct platform_device *pdev) {
> + struct beu_sifive_ddata *ddata = platform_get_drvdata(pdev);
> +
> + /* Mask all error events */
> + writeb(0, ddata->regs + SIFIVE_BEU_ENABLE);
> + writeb(0, ddata->regs + SIFIVE_BEU_PLIC_INTR);
> + writeb(0, ddata->regs + SIFIVE_BEU_LOCAL_INTR);
> +
> + return 0;
> +}
> +
> +static const struct of_device_id beu_sifive_of_match[] = {
> + { .compatible = "sifive,beu0" },
> + {},
> +};
> +MODULE_DEVICE_TABLE(of, beu_sifive_of_match);
> +
> +static struct platform_driver beu_sifive_driver = {
> + .probe = beu_sifive_probe,
> + .remove = beu_sifive_remove,
> + .driver = {
> + .name = "beu-sifive",
> + .of_match_table = beu_sifive_of_match,
> + },
> +};
> +module_platform_driver(beu_sifive_driver);
> +
> +MODULE_DESCRIPTION("SiFive BEU driver"); MODULE_LICENSE("GPL v2");
> diff --git a/include/soc/sifive/sifive_beu.h b/include/soc/sifive/sifive_beu.h
> new file mode 100644 index 0000000..c2ab688
> --- /dev/null
> +++ b/include/soc/sifive/sifive_beu.h
> @@ -0,0 +1,16 @@
> +/* SPDX-License-Identifier: GPL-2.0 */
> +/*
> + * SiFive Bus Error unit header file
> + *
> + */
> +
> +#ifndef __SOC_SIFIVE_BEU_H
> +#define __SOC_SIFIVE_BEU_H
> +
> +extern int register_sifive_beu_error_notifier(struct notifier_block
> +*nb); extern int unregister_sifive_beu_error_notifier(struct
> +notifier_block *nb);
> +
> +#define SIFIVE_BEU_ERR_TYPE_CE 0
> +#define SIFIVE_BEU_ERR_TYPE_UE 1
> +
> +#endif /* __SOC_SIFIVE_BEU_H */
> --
> 2.7.4

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