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-rw-r--r--drivers/pci/host/pci-aardvark.c5
-rw-r--r--drivers/pci/host/pcie-altera-msi.c6
-rw-r--r--drivers/pci/host/pcie-altera.c13
-rw-r--r--include/linux/pci-epf.h9
-rw-r--r--include/linux/pci.h54
5 files changed, 65 insertions, 22 deletions
diff --git a/drivers/pci/host/pci-aardvark.c b/drivers/pci/host/pci-aardvark.c
index 5fb9b620ac78..89f4e3d072d7 100644
--- a/drivers/pci/host/pci-aardvark.c
+++ b/drivers/pci/host/pci-aardvark.c
@@ -191,7 +191,6 @@
#define LINK_WAIT_USLEEP_MIN 90000
#define LINK_WAIT_USLEEP_MAX 100000
-#define LEGACY_IRQ_NUM 4
#define MSI_IRQ_NUM 32
struct advk_pcie {
@@ -729,7 +728,7 @@ static int advk_pcie_init_irq_domain(struct advk_pcie *pcie)
irq_chip->irq_unmask = advk_pcie_irq_unmask;
pcie->irq_domain =
- irq_domain_add_linear(pcie_intc_node, LEGACY_IRQ_NUM,
+ irq_domain_add_linear(pcie_intc_node, PCI_NUM_INTX,
&advk_pcie_irq_domain_ops, pcie);
if (!pcie->irq_domain) {
dev_err(dev, "Failed to get a INTx IRQ domain\n");
@@ -786,7 +785,7 @@ static void advk_pcie_handle_int(struct advk_pcie *pcie)
advk_pcie_handle_msi(pcie);
/* Process legacy interrupts */
- for (i = 0; i < LEGACY_IRQ_NUM; i++) {
+ for (i = 0; i < PCI_NUM_INTX; i++) {
if (!(status & PCIE_ISR0_INTX_ASSERT(i)))
continue;
diff --git a/drivers/pci/host/pcie-altera-msi.c b/drivers/pci/host/pcie-altera-msi.c
index 4e5d628e8cd4..d8141f4865de 100644
--- a/drivers/pci/host/pcie-altera-msi.c
+++ b/drivers/pci/host/pcie-altera-msi.c
@@ -64,13 +64,11 @@ static void altera_msi_isr(struct irq_desc *desc)
struct irq_chip *chip = irq_desc_get_chip(desc);
struct altera_msi *msi;
unsigned long status;
- u32 num_of_vectors;
u32 bit;
u32 virq;
chained_irq_enter(chip, desc);
msi = irq_desc_get_handler_data(desc);
- num_of_vectors = msi->num_of_vectors;
while ((status = msi_readl(msi, MSI_STATUS)) != 0) {
for_each_set_bit(bit, &status, msi->num_of_vectors) {
@@ -267,9 +265,9 @@ static int altera_msi_probe(struct platform_device *pdev)
return ret;
msi->irq = platform_get_irq(pdev, 0);
- if (msi->irq <= 0) {
+ if (msi->irq < 0) {
dev_err(&pdev->dev, "failed to map IRQ: %d\n", msi->irq);
- ret = -ENODEV;
+ ret = msi->irq;
goto err;
}
diff --git a/drivers/pci/host/pcie-altera.c b/drivers/pci/host/pcie-altera.c
index 4ea4f8f5dc77..b468b8cccf8d 100644
--- a/drivers/pci/host/pcie-altera.c
+++ b/drivers/pci/host/pcie-altera.c
@@ -76,8 +76,6 @@
#define LINK_UP_TIMEOUT HZ
#define LINK_RETRAIN_TIMEOUT HZ
-#define INTX_NUM 4
-
#define DWORD_MASK 3
struct altera_pcie {
@@ -464,6 +462,7 @@ static int altera_pcie_intx_map(struct irq_domain *domain, unsigned int irq,
static const struct irq_domain_ops intx_domain_ops = {
.map = altera_pcie_intx_map,
+ .xlate = pci_irqd_intx_xlate,
};
static void altera_pcie_isr(struct irq_desc *desc)
@@ -481,11 +480,11 @@ static void altera_pcie_isr(struct irq_desc *desc)
while ((status = cra_readl(pcie, P2A_INT_STATUS)
& P2A_INT_STS_ALL) != 0) {
- for_each_set_bit(bit, &status, INTX_NUM) {
+ for_each_set_bit(bit, &status, PCI_NUM_INTX) {
/* clear interrupts */
cra_writel(pcie, 1 << bit, P2A_INT_STATUS);
- virq = irq_find_mapping(pcie->irq_domain, bit + 1);
+ virq = irq_find_mapping(pcie->irq_domain, bit);
if (virq)
generic_handle_irq(virq);
else
@@ -536,7 +535,7 @@ static int altera_pcie_init_irq_domain(struct altera_pcie *pcie)
struct device_node *node = dev->of_node;
/* Setup INTx */
- pcie->irq_domain = irq_domain_add_linear(node, INTX_NUM + 1,
+ pcie->irq_domain = irq_domain_add_linear(node, PCI_NUM_INTX,
&intx_domain_ops, pcie);
if (!pcie->irq_domain) {
dev_err(dev, "Failed to get a INTx IRQ domain\n");
@@ -559,9 +558,9 @@ static int altera_pcie_parse_dt(struct altera_pcie *pcie)
/* setup IRQ */
pcie->irq = platform_get_irq(pdev, 0);
- if (pcie->irq <= 0) {
+ if (pcie->irq < 0) {
dev_err(dev, "failed to get IRQ: %d\n", pcie->irq);
- return -EINVAL;
+ return pcie->irq;
}
irq_set_chained_handler_and_data(pcie->irq, altera_pcie_isr, pcie);
diff --git a/include/linux/pci-epf.h b/include/linux/pci-epf.h
index 0d529cb90143..bc8750688348 100644
--- a/include/linux/pci-epf.h
+++ b/include/linux/pci-epf.h
@@ -14,17 +14,10 @@
#include <linux/device.h>
#include <linux/mod_devicetable.h>
+#include <linux/pci.h>
struct pci_epf;
-enum pci_interrupt_pin {
- PCI_INTERRUPT_UNKNOWN,
- PCI_INTERRUPT_INTA,
- PCI_INTERRUPT_INTB,
- PCI_INTERRUPT_INTC,
- PCI_INTERRUPT_INTD,
-};
-
enum pci_barno {
BAR_0,
BAR_1,
diff --git a/include/linux/pci.h b/include/linux/pci.h
index 4869e66dd659..bbc2a991b63f 100644
--- a/include/linux/pci.h
+++ b/include/linux/pci.h
@@ -102,6 +102,28 @@ enum {
DEVICE_COUNT_RESOURCE = PCI_NUM_RESOURCES,
};
+/**
+ * enum pci_interrupt_pin - PCI INTx interrupt values
+ * @PCI_INTERRUPT_UNKNOWN: Unknown or unassigned interrupt
+ * @PCI_INTERRUPT_INTA: PCI INTA pin
+ * @PCI_INTERRUPT_INTB: PCI INTB pin
+ * @PCI_INTERRUPT_INTC: PCI INTC pin
+ * @PCI_INTERRUPT_INTD: PCI INTD pin
+ *
+ * Corresponds to values for legacy PCI INTx interrupts, as can be found in the
+ * PCI_INTERRUPT_PIN register.
+ */
+enum pci_interrupt_pin {
+ PCI_INTERRUPT_UNKNOWN,
+ PCI_INTERRUPT_INTA,
+ PCI_INTERRUPT_INTB,
+ PCI_INTERRUPT_INTC,
+ PCI_INTERRUPT_INTD,
+};
+
+/* The number of legacy PCI INTx interrupts */
+#define PCI_NUM_INTX 4
+
/*
* pci_power_t values must match the bits in the Capabilities PME_Support
* and Control/Status PowerState fields in the Power Management capability.
@@ -1394,6 +1416,38 @@ pci_alloc_irq_vectors(struct pci_dev *dev, unsigned int min_vecs,
NULL);
}
+/**
+ * pci_irqd_intx_xlate() - Translate PCI INTx value to an IRQ domain hwirq
+ * @d: the INTx IRQ domain
+ * @node: the DT node for the device whose interrupt we're translating
+ * @intspec: the interrupt specifier data from the DT
+ * @intsize: the number of entries in @intspec
+ * @out_hwirq: pointer at which to write the hwirq number
+ * @out_type: pointer at which to write the interrupt type
+ *
+ * Translate a PCI INTx interrupt number from device tree in the range 1-4, as
+ * stored in the standard PCI_INTERRUPT_PIN register, to a value in the range
+ * 0-3 suitable for use in a 4 entry IRQ domain. That is, subtract one from the
+ * INTx value to obtain the hwirq number.
+ *
+ * Returns 0 on success, or -EINVAL if the interrupt specifier is out of range.
+ */
+static inline int pci_irqd_intx_xlate(struct irq_domain *d,
+ struct device_node *node,
+ const u32 *intspec,
+ unsigned int intsize,
+ unsigned long *out_hwirq,
+ unsigned int *out_type)
+{
+ const u32 intx = intspec[0];
+
+ if (intx < PCI_INTERRUPT_INTA || intx > PCI_INTERRUPT_INTD)
+ return -EINVAL;
+
+ *out_hwirq = intx - PCI_INTERRUPT_INTA;
+ return 0;
+}
+
#ifdef CONFIG_PCIEPORTBUS
extern bool pcie_ports_disabled;
extern bool pcie_ports_auto;
Copyright © 1996 – 2023 Jason A. Donenfeld. All Rights Reverse Engineered.