ramips: improve interrupt mapping

As the Interrupts for the PCI adapters are listed in
devicetree we shouldn't need to have them explicit in the code.

The simplest way to do this is to use of_irq_parse_and_map_pci()
and specify an interrupt-map which identifies the different
PCI hosts by bus/slot numbers.
This has the advantage that the hwirq number are mapped to virq
numbers for us, so the ugly hack can go.

Signed-off-by: NeilBrown <[email protected]>
Signed-off-by: Greg Kroah-Hartman <[email protected]>

target/linux/ramips/dts/mt7621.dtsi

@@ -440,10 +440,11 @@
 			0x01000000 0 0x00000000 0x1e160000 0 0x00010000 /* io space */
 		>;
 
-		interrupt-parent = <&gic>;
-		interrupts = <GIC_SHARED 4 IRQ_TYPE_LEVEL_HIGH
-				GIC_SHARED 24 IRQ_TYPE_LEVEL_HIGH
-				GIC_SHARED 25 IRQ_TYPE_LEVEL_HIGH>;
+		#interrupt-cells = <1>;
+		interrupt-map-mask = <0xF0000 0 0 1>;
+		interrupt-map = <0x10000 0 0 1 &gic GIC_SHARED 4 IRQ_TYPE_LEVEL_HIGH>,
+				<0x20000 0 0 1 &gic GIC_SHARED 24 IRQ_TYPE_LEVEL_HIGH>,
+				<0x30000 0 0 1 &gic GIC_SHARED 25 IRQ_TYPE_LEVEL_HIGH>;
 
 		status = "disabled";
 

target/linux/ramips/files-4.14/arch/mips/pci/pci-mt7621.c

@@ -74,9 +74,6 @@ extern void chk_phy_pll(void);
 
 #define RALINK_PCI_CONFIG_ADDR                         0x20
 #define RALINK_PCI_CONFIG_DATA_VIRTUAL_REG     0x24
-#define RALINK_INT_PCIE0         pcie_irq[0]
-#define RALINK_INT_PCIE1         pcie_irq[1]
-#define RALINK_INT_PCIE2         pcie_irq[2]
 #define RALINK_PCI_MEMBASE              *(volatile u32 *)(RALINK_PCI_BASE + 0x0028)
 #define RALINK_PCI_IOBASE               *(volatile u32 *)(RALINK_PCI_BASE + 0x002C)
 #define RALINK_PCIE0_RST                (1<<24)
@@ -367,68 +364,12 @@ pcibios_map_irq(const struct pci_dev *dev, u8 slot, u8 pin)
 {
 	u16 cmd;
 	u32 val;
-	int irq = 0;
-
-	if ((dev->bus->number == 0) && (slot == 0)) {
-		write_config(0, 0, 0, PCI_BASE_ADDRESS_0, MEMORY_BASE);
-		read_config(0, 0, 0, PCI_BASE_ADDRESS_0, (unsigned long *)&val);
-		printk("BAR0 at slot 0 = %x\n", val);
-		printk("bus=0x%x, slot = 0x%x\n",dev->bus->number, slot);
-	} else if((dev->bus->number == 0) && (slot == 0x1)) {
-		write_config(0, 1, 0, PCI_BASE_ADDRESS_0, MEMORY_BASE);
-		read_config(0, 1, 0, PCI_BASE_ADDRESS_0, (unsigned long *)&val);
-		printk("BAR0 at slot 1 = %x\n", val);
-		printk("bus=0x%x, slot = 0x%x\n",dev->bus->number, slot);
-	} else if((dev->bus->number == 0) && (slot == 0x2)) {
-		write_config(0, 2, 0, PCI_BASE_ADDRESS_0, MEMORY_BASE);
-		read_config(0, 2, 0, PCI_BASE_ADDRESS_0, (unsigned long *)&val);
-		printk("BAR0 at slot 2 = %x\n", val);
-		printk("bus=0x%x, slot = 0x%x\n",dev->bus->number, slot);
-	} else if ((dev->bus->number == 1) && (slot == 0x0)) {
-		switch (pcie_link_status) {
-		case 2:
-		case 6:
-			irq = RALINK_INT_PCIE1;
-			break;
-		case 4:
-			irq = RALINK_INT_PCIE2;
-			break;
-		default:
-			irq = RALINK_INT_PCIE0;
-		}
-		printk("bus=0x%x, slot = 0x%x, irq=0x%x\n",dev->bus->number, slot, dev->irq);
-	} else if ((dev->bus->number == 2) && (slot == 0x0)) {
-		switch (pcie_link_status) {
-		case 5:
-		case 6:
-			irq = RALINK_INT_PCIE2;
-			break;
-		default:
-			irq = RALINK_INT_PCIE1;
-		}
-		printk("bus=0x%x, slot = 0x%x, irq=0x%x\n",dev->bus->number, slot, dev->irq);
-	} else if ((dev->bus->number == 2) && (slot == 0x1)) {
-		switch (pcie_link_status) {
-		case 5:
-		case 6:
-			irq = RALINK_INT_PCIE2;
-			break;
-		default:
-			irq = RALINK_INT_PCIE1;
-		}
-		printk("bus=0x%x, slot = 0x%x, irq=0x%x\n",dev->bus->number, slot, dev->irq);
-	} else if ((dev->bus->number ==3) && (slot == 0x0)) {
-		irq = RALINK_INT_PCIE2;
-		printk("bus=0x%x, slot = 0x%x, irq=0x%x\n",dev->bus->number, slot, dev->irq);
-	} else if ((dev->bus->number ==3) && (slot == 0x1)) {
-		irq = RALINK_INT_PCIE2;
-		printk("bus=0x%x, slot = 0x%x, irq=0x%x\n",dev->bus->number, slot, dev->irq);
-	} else if ((dev->bus->number ==3) && (slot == 0x2)) {
-		irq = RALINK_INT_PCIE2;
-		printk("bus=0x%x, slot = 0x%x, irq=0x%x\n",dev->bus->number, slot, dev->irq);
-	} else {
-		printk("bus=0x%x, slot = 0x%x\n",dev->bus->number, slot);
-		return 0;
+	int irq;
+
+	if (dev->bus->number == 0) {
+		write_config(0, slot, 0, PCI_BASE_ADDRESS_0, MEMORY_BASE);
+		read_config(0, slot, 0, PCI_BASE_ADDRESS_0, (unsigned long *)&val);
+		printk("BAR0 at slot %d = %x\n", slot, val);
 	}
 
 	pci_write_config_byte(dev, PCI_CACHE_LINE_SIZE, 0x14);  //configure cache line size 0x14
@@ -436,6 +377,9 @@ pcibios_map_irq(const struct pci_dev *dev, u8 slot, u8 pin)
 	pci_read_config_word(dev, PCI_COMMAND, &cmd);
 	cmd = cmd | PCI_COMMAND_MASTER | PCI_COMMAND_IO | PCI_COMMAND_MEMORY;
 	pci_write_config_word(dev, PCI_COMMAND, cmd);
+
+	irq = of_irq_parse_and_map_pci(dev, slot, pin);
+
 	pci_write_config_byte(dev, PCI_INTERRUPT_LINE, irq);
 	return irq;
 }