[PATCH 2/9] PCI: host: rcar: Add MSI support

[Phil Edworthy <phil.edworthy@renesas.com>]

Signed-off-by: Phil Edworthy <phil.edworthy@renesas.com>
---
 drivers/pci/host/pcie-rcar.c |  232 +++++++++++++++++++++++++++++++++++++++++-
 drivers/pci/host/pcie-rcar.h |    5 +
 2 files changed, 236 insertions(+), 1 deletion(-)

diff --git a/drivers/pci/host/pcie-rcar.c b/drivers/pci/host/pcie-rcar.c
index 7f094fa..a6f4049 100644
--- a/drivers/pci/host/pcie-rcar.c
+++ b/drivers/pci/host/pcie-rcar.c
@@ -14,8 +14,11 @@
 
 #include <linux/delay.h>
 #include <linux/interrupt.h>
+#include <linux/irq.h>
+#include <linux/irqdomain.h>
 #include <linux/module.h>
 #include <linux/kernel.h>
+#include <linux/msi.h>
 #include <linux/of_address.h>
 #include <linux/of_irq.h>
 #include <linux/of_pci.h>
@@ -34,6 +37,8 @@ enum chip_id {
 	RCAR_H1,
 };
 
+#define INT_PCI_MSI_NR	32
+
 #define RCONF(x)	(PCICONF(0)+(x))
 #define RPMCAP(x)	(PMCAP(0)+(x))
 #define REXPCAP(x)	(EXPCAP(0)+(x))
@@ -53,6 +58,20 @@ static const struct of_device_id rcar_pcie_of_match[] = {
 };
 MODULE_DEVICE_TABLE(of, rcar_pcie_of_match);
 
+struct rcar_msi {
+	DECLARE_BITMAP(used, INT_PCI_MSI_NR);
+	struct irq_domain *domain;
+	struct msi_chip chip;
+	unsigned long pages;
+	struct mutex lock;
+	int irq;
+};
+
+static inline struct rcar_msi *to_rcar_msi(struct msi_chip *chip)
+{
+	return container_of(chip, struct rcar_msi, chip);
+}
+
 /* Structure representing the PCIe interface */
 struct rcar_pcie {
 	struct device		*dev;
@@ -62,6 +81,7 @@ struct rcar_pcie {
 	enum chip_id		chip;
 	u8			root_bus_nr;
 	struct clk		*clk;
+	struct			rcar_msi msi;
 };
 
 static inline struct rcar_pcie *sys_to_pcie(struct pci_sys_data *sys)
@@ -313,6 +333,15 @@ static int rcar_pcie_setup(int nr, struct pci_sys_data *sys)
 	return 1;
 }
 
+static void rcar_pcie_add_bus(struct pci_bus *bus)
+{
+	if (IS_ENABLED(CONFIG_PCI_MSI)) {
+		struct rcar_pcie *pcie = sys_to_pcie(bus->sysdata);
+
+		bus->msi = &pcie->msi.chip;
+	}
+}
+
 static void __init rcar_pcie_enable(struct rcar_pcie *pcie)
 {
 	struct platform_device *pdev = to_platform_device(pcie->dev);
@@ -325,6 +354,7 @@ static void __init rcar_pcie_enable(struct rcar_pcie *pcie)
 	hw.setup          = rcar_pcie_setup,
 	hw.map_irq        = of_irq_parse_and_map_pci,
 	hw.ops		  = &rcar_pcie_ops,
+	hw.add_bus	  = rcar_pcie_add_bus;
 
 	pci_common_init_dev(&pdev->dev, &hw);
 }
@@ -479,6 +509,10 @@ static void __init rcar_pcie_hw_init(struct rcar_pcie *pcie)
 	/* Enable MAC data scrambling. */
 	rcar_rmw32(pcie, MACCTLR, SCRAMBLE_DISABLE, 0);
 
+	/* Enable MSI */
+	if (IS_ENABLED(CONFIG_PCI_MSI))
+		pci_write_reg(pcie, 0x101f0000, PCIEMSITXR);
+
 	/* Finish initialization - establish a PCI Express link */
 	pci_write_reg(pcie, CFINIT, PCIETCTLR);
 
@@ -514,12 +548,191 @@ static int rcar_pcie_runtime_resume(struct device *dev)
 }
 #endif
 
+static int rcar_msi_alloc(struct rcar_msi *chip)
+{
+	int msi;
+
+	mutex_lock(&chip->lock);
+
+	msi = find_first_zero_bit(chip->used, INT_PCI_MSI_NR);
+	if (msi < INT_PCI_MSI_NR)
+		set_bit(msi, chip->used);
+	else
+		msi = -ENOSPC;
+
+	mutex_unlock(&chip->lock);
+
+	return msi;
+}
+
+static void rcar_msi_free(struct rcar_msi *chip, unsigned long irq)
+{
+	struct device *dev = chip->chip.dev;
+
+	mutex_lock(&chip->lock);
+
+	if (!test_bit(irq, chip->used))
+		dev_err(dev, "trying to free unused MSI#%lu\n", irq);
+	else
+		clear_bit(irq, chip->used);
+
+	mutex_unlock(&chip->lock);
+}
+
+static irqreturn_t rcar_pcie_msi_irq(int irq, void *data)
+{
+	struct rcar_pcie *pcie = data;
+	struct rcar_msi *msi = &pcie->msi;
+	unsigned long reg;
+
+	reg = pci_read_reg(pcie, PCIEMSIFR);
+
+	while (reg) {
+		unsigned int index = find_first_bit(&reg, 32);
+		unsigned int irq;
+
+		/* clear the interrupt */
+		pci_write_reg(pcie, 1 << index, PCIEMSIFR);
+
+		irq = irq_find_mapping(msi->domain, index);
+		if (irq) {
+			if (test_bit(index, msi->used))
+				generic_handle_irq(irq);
+			else
+				dev_info(pcie->dev, "unhandled MSI\n");
+		} else {
+			/*
+			 * that's weird who triggered this?
+			 * just clear it
+			 */
+			dev_info(pcie->dev, "unexpected MSI\n");
+		}
+
+		/* see if there's any more pending in this vector */
+		reg = pci_read_reg(pcie, PCIEMSIFR);
+	}
+
+	return IRQ_HANDLED;
+}
+
+static int rcar_msi_setup_irq(struct msi_chip *chip, struct pci_dev *pdev,
+			       struct msi_desc *desc)
+{
+	struct rcar_msi *msi = to_rcar_msi(chip);
+	struct rcar_pcie *pcie = container_of(chip, struct rcar_pcie, msi.chip);
+	struct msi_msg msg;
+	unsigned int irq;
+	int hwirq;
+
+	hwirq = rcar_msi_alloc(msi);
+	if (hwirq < 0)
+		return hwirq;
+
+	irq = irq_create_mapping(msi->domain, hwirq);
+	if (!irq) {
+		rcar_msi_free(msi, hwirq);
+		return -EINVAL;
+	}
+
+	irq_set_msi_desc(irq, desc);
+
+	msg.address_lo = pci_read_reg(pcie, PCIEMSIALR) & ~MSIFE;
+	msg.address_hi = pci_read_reg(pcie, PCIEMSIAUR);
+	msg.data = hwirq;
+
+	write_msi_msg(irq, &msg);
+
+	return 0;
+}
+
+static void rcar_msi_teardown_irq(struct msi_chip *chip, unsigned int irq)
+{
+	struct rcar_msi *msi = to_rcar_msi(chip);
+	struct irq_data *d = irq_get_irq_data(irq);
+
+	rcar_msi_free(msi, d->hwirq);
+}
+
+static struct irq_chip rcar_msi_irq_chip = {
+	.name = "R-Car PCIe MSI",
+	.irq_enable = unmask_msi_irq,
+	.irq_disable = mask_msi_irq,
+	.irq_mask = mask_msi_irq,
+	.irq_unmask = unmask_msi_irq,
+};
+
+static int rcar_msi_map(struct irq_domain *domain, unsigned int irq,
+			 irq_hw_number_t hwirq)
+{
+	irq_set_chip_and_handler(irq, &rcar_msi_irq_chip, handle_simple_irq);
+	irq_set_chip_data(irq, domain->host_data);
+	set_irq_flags(irq, IRQF_VALID);
+
+	return 0;
+}
+
+static const struct irq_domain_ops msi_domain_ops = {
+	.map = rcar_msi_map,
+};
+
+static int rcar_pcie_enable_msi(struct rcar_pcie *pcie)
+{
+	struct platform_device *pdev = to_platform_device(pcie->dev);
+	struct rcar_msi *msi = &pcie->msi;
+	unsigned long base;
+	int err;
+
+	mutex_init(&msi->lock);
+
+	msi->chip.dev = pcie->dev;
+	msi->chip.setup_irq = rcar_msi_setup_irq;
+	msi->chip.teardown_irq = rcar_msi_teardown_irq;
+
+	msi->domain = irq_domain_add_linear(pcie->dev->of_node, INT_PCI_MSI_NR,
+					    &msi_domain_ops, &msi->chip);
+	if (!msi->domain) {
+		dev_err(&pdev->dev, "failed to create IRQ domain\n");
+		return -ENOMEM;
+	}
+
+	/* Two irqs are for MSI, but they are also used for non-MSI irqs */
+	err = devm_request_irq(&pdev->dev, msi->irq, rcar_pcie_msi_irq,
+			       IRQF_SHARED, rcar_msi_irq_chip.name, pcie);
+	if (err < 0) {
+		dev_err(&pdev->dev, "failed to request IRQ: %d\n", err);
+		goto err;
+	}
+
+	err = devm_request_irq(&pdev->dev, msi->irq+1, rcar_pcie_msi_irq,
+			       IRQF_SHARED, rcar_msi_irq_chip.name, pcie);
+	if (err < 0) {
+		dev_err(&pdev->dev, "failed to request IRQ: %d\n", err);
+		goto err;
+	}
+
+	/* setup MSI data target */
+	msi->pages = __get_free_pages(GFP_KERNEL, 0);
+	base = virt_to_phys((void *)msi->pages);
+
+	pci_write_reg(pcie, base | MSIFE, PCIEMSIALR);
+	pci_write_reg(pcie, 0, PCIEMSIAUR);
+
+	/* enable all MSI interrupts */
+	pci_write_reg(pcie, 0xffffffff, PCIEMSIIER);
+
+	return 0;
+
+err:
+	irq_domain_remove(msi->domain);
+	return err;
+}
+
 static int __init rcar_pcie_get_resources(struct platform_device *pdev,
 	struct rcar_pcie *pcie)
 {
 	struct device *dev = &pdev->dev;
 	struct resource res;
-	int err;
+	int err, i;
 
 	err = of_address_to_resource(pdev->dev.of_node, 0, &res);
 	if (err)
@@ -531,6 +744,13 @@ static int __init rcar_pcie_get_resources(struct platform_device *pdev,
 		return PTR_ERR(pcie->clk);
 	}
 
+	i = irq_of_parse_and_map(pdev->dev.of_node, 0);
+	if (i < 0) {
+		dev_err(pcie->dev, "cannot get platform resources for msi interrupt\n");
+		return -ENOENT;
+	}
+	pcie->msi.irq = i;
+
 	pm_runtime_enable(dev);
 	pm_runtime_get_sync(dev);
 
@@ -588,6 +808,16 @@ static int __init rcar_pcie_probe(struct platform_device *pdev)
 			break;
 	}
 
+	if (IS_ENABLED(CONFIG_PCI_MSI)) {
+		err = rcar_pcie_enable_msi(pcie);
+		if (err < 0) {
+			dev_err(&pdev->dev,
+				"failed to enable MSI support: %d\n",
+				err);
+			return err;
+		}
+	}
+
 	rcar_pcie_hw_init(pcie);
 
 	if (!pcie->haslink) {
diff --git a/drivers/pci/host/pcie-rcar.h b/drivers/pci/host/pcie-rcar.h
index 3dc026b..4f0c678 100644
--- a/drivers/pci/host/pcie-rcar.h
+++ b/drivers/pci/host/pcie-rcar.h
@@ -13,6 +13,7 @@
 #define PCIEMSR			0x000028
 #define PCIEINTXR		0x000400
 #define PCIEPHYSR		0x0007f0
+#define PCIEMSITXR		0x000840
 
 /* Transfer control */
 #define PCIETCTLR		0x02000
@@ -28,6 +29,10 @@
 #define PCIEPMSR		0x02034
 #define PCIEPMSCIER		0x02038
 #define PCIEMSIFR		0x02044
+#define PCIEMSIALR		0x02048
+#define  MSIFE			1
+#define PCIEMSIAUR		0x0204c
+#define PCIEMSIIER		0x02050
 
 /* root port address */
 #define PCIEPRAR(x)		(0x02080 + ((x) * 0x4))
-- 
1.7.9.5