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// SPDX-License-Identifier: GPL-2.0-only
/*
* RISC-V IOMMU as a platform device
*
* Copyright © 2023 FORTH-ICS/CARV
* Copyright © 2023-2024 Rivos Inc.
*
* Authors
* Nick Kossifidis <mick@ics.forth.gr>
* Tomasz Jeznach <tjeznach@rivosinc.com>
*/
#include <linux/kernel.h>
#include <linux/of_platform.h>
#include <linux/platform_device.h>
#include "iommu-bits.h"
#include "iommu.h"
static int riscv_iommu_platform_probe(struct platform_device *pdev)
{
struct device *dev = &pdev->dev;
struct riscv_iommu_device *iommu = NULL;
struct resource *res = NULL;
int vec;
iommu = devm_kzalloc(dev, sizeof(*iommu), GFP_KERNEL);
if (!iommu)
return -ENOMEM;
iommu->dev = dev;
iommu->reg = devm_platform_get_and_ioremap_resource(pdev, 0, &res);
if (IS_ERR(iommu->reg))
return dev_err_probe(dev, PTR_ERR(iommu->reg),
"could not map register region\n");
dev_set_drvdata(dev, iommu);
/* Check device reported capabilities / features. */
iommu->caps = riscv_iommu_readq(iommu, RISCV_IOMMU_REG_CAPABILITIES);
iommu->fctl = riscv_iommu_readl(iommu, RISCV_IOMMU_REG_FCTL);
/* For now we only support WSI */
switch (FIELD_GET(RISCV_IOMMU_CAPABILITIES_IGS, iommu->caps)) {
case RISCV_IOMMU_CAPABILITIES_IGS_WSI:
case RISCV_IOMMU_CAPABILITIES_IGS_BOTH:
break;
default:
return dev_err_probe(dev, -ENODEV,
"unable to use wire-signaled interrupts\n");
}
iommu->irqs_count = platform_irq_count(pdev);
if (iommu->irqs_count <= 0)
return dev_err_probe(dev, -ENODEV,
"no IRQ resources provided\n");
if (iommu->irqs_count > RISCV_IOMMU_INTR_COUNT)
iommu->irqs_count = RISCV_IOMMU_INTR_COUNT;
for (vec = 0; vec < iommu->irqs_count; vec++)
iommu->irqs[vec] = platform_get_irq(pdev, vec);
/* Enable wire-signaled interrupts, fctl.WSI */
if (!(iommu->fctl & RISCV_IOMMU_FCTL_WSI)) {
iommu->fctl |= RISCV_IOMMU_FCTL_WSI;
riscv_iommu_writel(iommu, RISCV_IOMMU_REG_FCTL, iommu->fctl);
}
return riscv_iommu_init(iommu);
};
static void riscv_iommu_platform_remove(struct platform_device *pdev)
{
riscv_iommu_remove(dev_get_drvdata(&pdev->dev));
};
static const struct of_device_id riscv_iommu_of_match[] = {
{.compatible = "riscv,iommu",},
{},
};
static struct platform_driver riscv_iommu_platform_driver = {
.probe = riscv_iommu_platform_probe,
.remove = riscv_iommu_platform_remove,
.driver = {
.name = "riscv,iommu",
.of_match_table = riscv_iommu_of_match,
.suppress_bind_attrs = true,
},
};
builtin_platform_driver(riscv_iommu_platform_driver);
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