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Message-Id: <20210816031621.240268-5-alyssa@rosenzweig.io>
Date: Sun, 15 Aug 2021 23:16:19 -0400
From: Alyssa Rosenzweig <alyssa@...enzweig.io>
To: linux-pci@...r.kernel.org
Cc: Bjorn Helgaas <bhelgaas@...gle.com>,
Rob Herring <robh+dt@...nel.org>,
Lorenzo Pieralisi <lorenzo.pieralisi@....com>,
Krzysztof Wilczyński <kw@...ux.com>,
Alyssa Rosenzweig <alyssa@...enzweig.io>,
Stan Skowronek <stan@...ellium.com>,
Marc Zyngier <maz@...nel.org>,
Mark Kettenis <kettenis@...nbsd.org>,
Sven Peter <sven@...npeter.dev>,
Hector Martin <marcan@...can.st>, devicetree@...r.kernel.org,
linux-kernel@...r.kernel.org
Subject: [PATCH v2 4/6] PCI: apple: Add MSI handling
Add MSI handling to the Apple PCIe driver. As the hardware is ECAM
compliant, this code is the only hardware-specific piece required
after probing. This is sufficient to bring up Ethernet and the USB type
A ports.
Co-developed-by: Marc Zyngier <maz@...nel.org>
Signed-off-by: Marc Zyngier <maz@...nel.org>
Signed-off-by: Alyssa Rosenzweig <alyssa@...enzweig.io>
---
drivers/pci/controller/pcie-apple.c | 152 +++++++++++++++++++++++++++-
1 file changed, 151 insertions(+), 1 deletion(-)
diff --git a/drivers/pci/controller/pcie-apple.c b/drivers/pci/controller/pcie-apple.c
index 4ab767cf841b..04ebb9b956ae 100644
--- a/drivers/pci/controller/pcie-apple.c
+++ b/drivers/pci/controller/pcie-apple.c
@@ -119,6 +119,10 @@ struct apple_pcie {
struct mutex lock;
struct device *dev;
void __iomem *rc;
+ struct irq_domain *domain;
+ unsigned long *bitmap;
+ u32 msi_base;
+ u32 nvecs;
};
static inline void rmwl(u32 clr, u32 set, void __iomem *addr)
@@ -126,6 +130,105 @@ static inline void rmwl(u32 clr, u32 set, void __iomem *addr)
writel_relaxed((readl_relaxed(addr) & ~clr) | set, addr);
}
+static void apple_msi_top_irq_mask(struct irq_data *d)
+{
+ pci_msi_mask_irq(d);
+ irq_chip_mask_parent(d);
+}
+
+static void apple_msi_top_irq_unmask(struct irq_data *d)
+{
+ pci_msi_unmask_irq(d);
+ irq_chip_unmask_parent(d);
+}
+
+static struct irq_chip apple_msi_top_chip = {
+ .name = "PCIe MSI",
+ .irq_mask = apple_msi_top_irq_mask,
+ .irq_unmask = apple_msi_top_irq_unmask,
+ .irq_eoi = irq_chip_eoi_parent,
+ .irq_set_affinity = irq_chip_set_affinity_parent,
+ .irq_set_type = irq_chip_set_type_parent,
+};
+
+static void apple_msi_compose_msg(struct irq_data *data, struct msi_msg *msg)
+{
+ msg->address_hi = upper_32_bits(DOORBELL_ADDR);
+ msg->address_lo = lower_32_bits(DOORBELL_ADDR);
+ msg->data = data->hwirq;
+}
+
+static struct irq_chip apple_msi_bottom_chip = {
+ .name = "MSI",
+ .irq_mask = irq_chip_mask_parent,
+ .irq_unmask = irq_chip_unmask_parent,
+ .irq_eoi = irq_chip_eoi_parent,
+ .irq_set_affinity = irq_chip_set_affinity_parent,
+ .irq_set_type = irq_chip_set_type_parent,
+ .irq_compose_msi_msg = apple_msi_compose_msg,
+};
+
+static int apple_msi_domain_alloc(struct irq_domain *domain, unsigned int virq,
+ unsigned int nr_irqs, void *args)
+{
+ struct apple_pcie *pcie = domain->host_data;
+ struct irq_fwspec fwspec;
+ unsigned int i;
+ int ret, hwirq;
+
+ mutex_lock(&pcie->lock);
+
+ hwirq = bitmap_find_free_region(pcie->bitmap, pcie->nvecs,
+ order_base_2(nr_irqs));
+
+ mutex_unlock(&pcie->lock);
+
+ if (hwirq < 0)
+ return -ENOSPC;
+
+ fwspec.fwnode = domain->parent->fwnode;
+ fwspec.param_count = 3;
+ fwspec.param[0] = 0;
+ fwspec.param[1] = hwirq + pcie->msi_base;
+ fwspec.param[2] = IRQ_TYPE_EDGE_RISING;
+
+ ret = irq_domain_alloc_irqs_parent(domain, virq, nr_irqs, &fwspec);
+ if (ret)
+ return ret;
+
+ for (i = 0; i < nr_irqs; i++) {
+ irq_domain_set_hwirq_and_chip(domain, virq + i, hwirq + i,
+ &apple_msi_bottom_chip,
+ domain->host_data);
+ }
+
+ return 0;
+}
+
+static void apple_msi_domain_free(struct irq_domain *domain, unsigned int virq,
+ unsigned int nr_irqs)
+{
+ struct irq_data *d = irq_domain_get_irq_data(domain, virq);
+ struct apple_pcie *pcie = domain->host_data;
+
+ mutex_lock(&pcie->lock);
+
+ bitmap_release_region(pcie->bitmap, d->hwirq, order_base_2(nr_irqs));
+
+ mutex_unlock(&pcie->lock);
+}
+
+static const struct irq_domain_ops apple_msi_domain_ops = {
+ .alloc = apple_msi_domain_alloc,
+ .free = apple_msi_domain_free,
+};
+
+static struct msi_domain_info apple_msi_info = {
+ .flags = (MSI_FLAG_USE_DEF_DOM_OPS | MSI_FLAG_USE_DEF_CHIP_OPS |
+ MSI_FLAG_MULTI_PCI_MSI | MSI_FLAG_PCI_MSIX),
+ .chip = &apple_msi_top_chip,
+};
+
static int apple_pcie_setup_refclk(void __iomem *rc,
void __iomem *port,
unsigned int idx)
@@ -225,6 +328,53 @@ static int apple_pcie_setup_port(struct apple_pcie *pcie,
return 0;
}
+static int apple_msi_init(struct apple_pcie *pcie)
+{
+ struct fwnode_handle *fwnode = dev_fwnode(pcie->dev);
+ struct device_node *parent_intc;
+ struct irq_domain *parent;
+ int ret;
+
+ ret = of_property_read_u32_index(to_of_node(fwnode), "msi-ranges",
+ 0, &pcie->msi_base);
+ if (ret)
+ return ret;
+
+ ret = of_property_read_u32_index(to_of_node(fwnode), "msi-ranges",
+ 1, &pcie->nvecs);
+ if (ret)
+ return ret;
+
+ pcie->bitmap = devm_bitmap_zalloc(pcie->dev, pcie->nvecs, GFP_KERNEL);
+ if (!pcie->bitmap)
+ return -ENOMEM;
+
+ parent_intc = of_irq_find_parent(to_of_node(fwnode));
+ parent = irq_find_host(parent_intc);
+ if (!parent_intc || !parent) {
+ dev_err(pcie->dev, "failed to find parent domain\n");
+ return -ENXIO;
+ }
+
+ parent = irq_domain_create_hierarchy(parent, 0, pcie->nvecs, fwnode,
+ &apple_msi_domain_ops, pcie);
+ if (!parent) {
+ dev_err(pcie->dev, "failed to create IRQ domain\n");
+ return -ENOMEM;
+ }
+ irq_domain_update_bus_token(parent, DOMAIN_BUS_NEXUS);
+
+ pcie->domain = pci_msi_create_irq_domain(fwnode, &apple_msi_info,
+ parent);
+ if (!pcie->domain) {
+ dev_err(pcie->dev, "failed to create MSI domain\n");
+ irq_domain_remove(parent);
+ return -ENOMEM;
+ }
+
+ return 0;
+}
+
static int apple_m1_pci_init(struct pci_config_window *cfg)
{
struct device *dev = cfg->parent;
@@ -267,7 +417,7 @@ static int apple_m1_pci_init(struct pci_config_window *cfg)
++i;
}
- return 0;
+ return apple_msi_init(pcie);
}
static const struct pci_ecam_ops apple_m1_cfg_ecam_ops = {
--
2.30.2
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