PCI: tango: Add MSI controller support

Add support for the MSI controller in Tango, which supports 256
message-signaled interrupts and a single doorbell address.

Signed-off-by: Marc Gonzalez <marc_gonzalez@sigmadesigns.com>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>

1 files changed, 202 insertions, 3 deletions

diff --git a/drivers/pci/host/pcie-tango.c b/drivers/pci/host/pcie-tango.c
index 6bbb81f06a53..e23f7383ac33 100644
--- a/drivers/pci/host/pcie-tango.c
+++ b/drivers/pci/host/pcie-tango.c
@@ -1,12 +1,172 @@
+#include <linux/irqchip/chained_irq.h>
+#include <linux/irqdomain.h>
 #include <linux/pci-ecam.h>
 #include <linux/delay.h>
-#include <linux/of.h>
+#include <linux/msi.h>
+#include <linux/of_address.h>
+
+#define MSI_MAX                 256
 
 #define SMP8759_MUX             0x48
 #define SMP8759_TEST_OUT        0x74
+#define SMP8759_DOORBELL        0x7c
+#define SMP8759_STATUS          0x80
+#define SMP8759_ENABLE          0xa0
 
 struct tango_pcie {
-        void __iomem *base;
+        DECLARE_BITMAP(used_msi, MSI_MAX);
+        u64                     msi_doorbell;
+        spinlock_t              used_msi_lock;
+        void __iomem            *base;
+        struct irq_domain       *dom;
+};
+
+static void tango_msi_isr(struct irq_desc *desc)
+{
+        struct irq_chip *chip = irq_desc_get_chip(desc);
+        struct tango_pcie *pcie = irq_desc_get_handler_data(desc);
+        unsigned long status, base, virq, idx, pos = 0;
+
+        chained_irq_enter(chip, desc);
+        spin_lock(&pcie->used_msi_lock);
+
+        while ((pos = find_next_bit(pcie->used_msi, MSI_MAX, pos)) < MSI_MAX) {
+                base = round_down(pos, 32);
+                status = readl_relaxed(pcie->base + SMP8759_STATUS + base / 8);
+                for_each_set_bit(idx, &status, 32) {
+                        virq = irq_find_mapping(pcie->dom, base + idx);
+                        generic_handle_irq(virq);
+                }
+                pos = base + 32;
+        }
+
+        spin_unlock(&pcie->used_msi_lock);
+        chained_irq_exit(chip, desc);
+}
+
+static void tango_ack(struct irq_data *d)
+{
+        struct tango_pcie *pcie = d->chip_data;
+        u32 offset = (d->hwirq / 32) * 4;
+        u32 bit = BIT(d->hwirq % 32);
+
+        writel_relaxed(bit, pcie->base + SMP8759_STATUS + offset);
+}
+
+static void update_msi_enable(struct irq_data *d, bool unmask)
+{
+        unsigned long flags;
+        struct tango_pcie *pcie = d->chip_data;
+        u32 offset = (d->hwirq / 32) * 4;
+        u32 bit = BIT(d->hwirq % 32);
+        u32 val;
+
+        spin_lock_irqsave(&pcie->used_msi_lock, flags);
+        val = readl_relaxed(pcie->base + SMP8759_ENABLE + offset);
+        val = unmask ? val | bit : val & ~bit;
+        writel_relaxed(val, pcie->base + SMP8759_ENABLE + offset);
+        spin_unlock_irqrestore(&pcie->used_msi_lock, flags);
+}
+
+static void tango_mask(struct irq_data *d)
+{
+        update_msi_enable(d, false);
+}
+
+static void tango_unmask(struct irq_data *d)
+{
+        update_msi_enable(d, true);
+}
+
+static int tango_set_affinity(struct irq_data *d, const struct cpumask *mask,
+                              bool force)
+{
+        return -EINVAL;
+}
+
+static void tango_compose_msi_msg(struct irq_data *d, struct msi_msg *msg)
+{
+        struct tango_pcie *pcie = d->chip_data;
+        msg->address_lo = lower_32_bits(pcie->msi_doorbell);
+        msg->address_hi = upper_32_bits(pcie->msi_doorbell);
+        msg->data = d->hwirq;
+}
+
+static struct irq_chip tango_chip = {
+        .irq_ack                = tango_ack,
+        .irq_mask               = tango_mask,
+        .irq_unmask             = tango_unmask,
+        .irq_set_affinity       = tango_set_affinity,
+        .irq_compose_msi_msg    = tango_compose_msi_msg,
+};
+
+static void msi_ack(struct irq_data *d)
+{
+        irq_chip_ack_parent(d);
+}
+
+static void msi_mask(struct irq_data *d)
+{
+        pci_msi_mask_irq(d);
+        irq_chip_mask_parent(d);
+}
+
+static void msi_unmask(struct irq_data *d)
+{
+        pci_msi_unmask_irq(d);
+        irq_chip_unmask_parent(d);
+}
+
+static struct irq_chip msi_chip = {
+        .name = "MSI",
+        .irq_ack = msi_ack,
+        .irq_mask = msi_mask,
+        .irq_unmask = msi_unmask,
+};
+
+static struct msi_domain_info msi_dom_info = {
+        .flags  = MSI_FLAG_PCI_MSIX
+                | MSI_FLAG_USE_DEF_DOM_OPS
+                | MSI_FLAG_USE_DEF_CHIP_OPS,
+        .chip   = &msi_chip,
+};
+
+static int tango_irq_domain_alloc(struct irq_domain *dom, unsigned int virq,
+                                  unsigned int nr_irqs, void *args)
+{
+        struct tango_pcie *pcie = dom->host_data;
+        unsigned long flags;
+        int pos;
+
+        spin_lock_irqsave(&pcie->used_msi_lock, flags);
+        pos = find_first_zero_bit(pcie->used_msi, MSI_MAX);
+        if (pos >= MSI_MAX) {
+                spin_unlock_irqrestore(&pcie->used_msi_lock, flags);
+                return -ENOSPC;
+        }
+        __set_bit(pos, pcie->used_msi);
+        spin_unlock_irqrestore(&pcie->used_msi_lock, flags);
+        irq_domain_set_info(dom, virq, pos, &tango_chip,
+                        pcie, handle_edge_irq, NULL, NULL);
+
+        return 0;
+}
+
+static void tango_irq_domain_free(struct irq_domain *dom, unsigned int virq,
+                                  unsigned int nr_irqs)
+{
+        unsigned long flags;
+        struct irq_data *d = irq_domain_get_irq_data(dom, virq);
+        struct tango_pcie *pcie = d->chip_data;
+
+        spin_lock_irqsave(&pcie->used_msi_lock, flags);
+        __clear_bit(d->hwirq, pcie->used_msi);
+        spin_unlock_irqrestore(&pcie->used_msi_lock, flags);
+}
+
+static const struct irq_domain_ops dom_ops = {
+        .alloc  = tango_irq_domain_alloc,
+        .free   = tango_irq_domain_free,
 };
 
 static int smp8759_config_read(struct pci_bus *bus, unsigned int devfn,
@@ -76,7 +236,11 @@ static int tango_pcie_probe(struct platform_device *pdev)
         struct device *dev = &pdev->dev;
         struct tango_pcie *pcie;
         struct resource *res;
-        int ret;
+        struct fwnode_handle *fwnode = of_node_to_fwnode(dev->of_node);
+        struct irq_domain *msi_dom, *irq_dom;
+        struct of_pci_range_parser parser;
+        struct of_pci_range range;
+        int virq, offset;
 
         dev_warn(dev, "simultaneous PCI config and MMIO accesses may cause data corruption\n");
         add_taint(TAINT_CRAP, LOCKDEP_STILL_OK);
@@ -95,6 +259,41 @@ static int tango_pcie_probe(struct platform_device *pdev)
         if (!tango_pcie_link_up(pcie))
                 return -ENODEV;
 
+        if (of_pci_dma_range_parser_init(&parser, dev->of_node) < 0)
+                return -ENOENT;
+
+        if (of_pci_range_parser_one(&parser, &range) == NULL)
+                return -ENOENT;
+
+        range.pci_addr += range.size;
+        pcie->msi_doorbell = range.pci_addr + res->start + SMP8759_DOORBELL;
+
+        for (offset = 0; offset < MSI_MAX / 8; offset += 4)
+                writel_relaxed(0, pcie->base + SMP8759_ENABLE + offset);
+
+        virq = platform_get_irq(pdev, 1);
+        if (virq <= 0) {
+                dev_err(dev, "Failed to map IRQ\n");
+                return -ENXIO;
+        }
+
+        irq_dom = irq_domain_create_linear(fwnode, MSI_MAX, &dom_ops, pcie);
+        if (!irq_dom) {
+                dev_err(dev, "Failed to create IRQ domain\n");
+                return -ENOMEM;
+        }
+
+        msi_dom = pci_msi_create_irq_domain(fwnode, &msi_dom_info, irq_dom);
+        if (!msi_dom) {
+                dev_err(dev, "Failed to create MSI domain\n");
+                irq_domain_remove(irq_dom);
+                return -ENOMEM;
+        }
+
+        pcie->dom = irq_dom;
+        spin_lock_init(&pcie->used_msi_lock);
+        irq_set_chained_handler_and_data(virq, tango_msi_isr, pcie);
+
         return pci_host_common_probe(pdev, &smp8759_ecam_ops);
 }