diff options
Diffstat (limited to 'drivers/iommu/riscv/iommu-platform.c')
| -rw-r--r-- | drivers/iommu/riscv/iommu-platform.c | 108 |
1 files changed, 90 insertions, 18 deletions
diff --git a/drivers/iommu/riscv/iommu-platform.c b/drivers/iommu/riscv/iommu-platform.c index 382ba2841849..725e919b97ef 100644 --- a/drivers/iommu/riscv/iommu-platform.c +++ b/drivers/iommu/riscv/iommu-platform.c @@ -11,18 +11,43 @@ */ #include <linux/kernel.h> +#include <linux/msi.h> +#include <linux/of_irq.h> #include <linux/of_platform.h> #include <linux/platform_device.h> #include "iommu-bits.h" #include "iommu.h" +static void riscv_iommu_write_msi_msg(struct msi_desc *desc, struct msi_msg *msg) +{ + struct device *dev = msi_desc_to_dev(desc); + struct riscv_iommu_device *iommu = dev_get_drvdata(dev); + u16 idx = desc->msi_index; + u64 addr; + + addr = ((u64)msg->address_hi << 32) | msg->address_lo; + + if (addr != (addr & RISCV_IOMMU_MSI_CFG_TBL_ADDR)) { + dev_err_once(dev, + "uh oh, the IOMMU can't send MSIs to 0x%llx, sending to 0x%llx instead\n", + addr, addr & RISCV_IOMMU_MSI_CFG_TBL_ADDR); + } + + addr &= RISCV_IOMMU_MSI_CFG_TBL_ADDR; + + riscv_iommu_writeq(iommu, RISCV_IOMMU_REG_MSI_CFG_TBL_ADDR(idx), addr); + riscv_iommu_writel(iommu, RISCV_IOMMU_REG_MSI_CFG_TBL_DATA(idx), msg->data); + riscv_iommu_writel(iommu, RISCV_IOMMU_REG_MSI_CFG_TBL_CTRL(idx), 0); +} + static int riscv_iommu_platform_probe(struct platform_device *pdev) { + enum riscv_iommu_igs_settings igs; struct device *dev = &pdev->dev; struct riscv_iommu_device *iommu = NULL; struct resource *res = NULL; - int vec; + int vec, ret; iommu = devm_kzalloc(dev, sizeof(*iommu), GFP_KERNEL); if (!iommu) @@ -40,16 +65,6 @@ static int riscv_iommu_platform_probe(struct platform_device *pdev) 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, @@ -57,13 +72,58 @@ static int riscv_iommu_platform_probe(struct platform_device *pdev) 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); + igs = FIELD_GET(RISCV_IOMMU_CAPABILITIES_IGS, iommu->caps); + switch (igs) { + case RISCV_IOMMU_CAPABILITIES_IGS_BOTH: + case RISCV_IOMMU_CAPABILITIES_IGS_MSI: + if (is_of_node(dev->fwnode)) + of_msi_configure(dev, to_of_node(dev->fwnode)); + + if (!dev_get_msi_domain(dev)) { + dev_warn(dev, "failed to find an MSI domain\n"); + goto msi_fail; + } + + ret = platform_device_msi_init_and_alloc_irqs(dev, iommu->irqs_count, + riscv_iommu_write_msi_msg); + if (ret) { + dev_warn(dev, "failed to allocate MSIs\n"); + goto msi_fail; + } + + for (vec = 0; vec < iommu->irqs_count; vec++) + iommu->irqs[vec] = msi_get_virq(dev, vec); + + /* Enable message-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); + } + + dev_info(dev, "using MSIs\n"); + break; + +msi_fail: + if (igs != RISCV_IOMMU_CAPABILITIES_IGS_BOTH) { + return dev_err_probe(dev, -ENODEV, + "unable to use wire-signaled interrupts\n"); + } - /* 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); + fallthrough; + + case RISCV_IOMMU_CAPABILITIES_IGS_WSI: + 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); + } + dev_info(dev, "using wire-signaled interrupts\n"); + break; + default: + return dev_err_probe(dev, -ENODEV, "invalid IGS\n"); } return riscv_iommu_init(iommu); @@ -71,7 +131,18 @@ static int riscv_iommu_platform_probe(struct platform_device *pdev) static void riscv_iommu_platform_remove(struct platform_device *pdev) { - riscv_iommu_remove(dev_get_drvdata(&pdev->dev)); + struct riscv_iommu_device *iommu = dev_get_drvdata(&pdev->dev); + bool msi = !(iommu->fctl & RISCV_IOMMU_FCTL_WSI); + + riscv_iommu_remove(iommu); + + if (msi) + platform_device_msi_free_irqs_all(&pdev->dev); +}; + +static void riscv_iommu_platform_shutdown(struct platform_device *pdev) +{ + riscv_iommu_disable(dev_get_drvdata(&pdev->dev)); }; static const struct of_device_id riscv_iommu_of_match[] = { @@ -82,6 +153,7 @@ static const struct of_device_id riscv_iommu_of_match[] = { static struct platform_driver riscv_iommu_platform_driver = { .probe = riscv_iommu_platform_probe, .remove = riscv_iommu_platform_remove, + .shutdown = riscv_iommu_platform_shutdown, .driver = { .name = "riscv,iommu", .of_match_table = riscv_iommu_of_match, |