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From:   NeilBrown <neil@brown.name>
To:     Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Date:   Fri, 04 May 2018 14:58:36 +1000
Subject: [PATCH 3/8] staging: mt7621-pci: improve interrupt mapping
Cc:     devel@driverdev.osuosl.org, linux-kernel@vger.kernel.org
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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 <neil@brown.name>
---
 drivers/staging/mt7621-dts/mt7621.dtsi  |    9 ++-
 drivers/staging/mt7621-pci/pci-mt7621.c |   90 +++----------------------------
 2 files changed, 14 insertions(+), 85 deletions(-)

diff --git a/drivers/staging/mt7621-dts/mt7621.dtsi b/drivers/staging/mt7621-dts/mt7621.dtsi
index ebcaa8b1fc81..9d941b531712 100644
--- a/drivers/staging/mt7621-dts/mt7621.dtsi
+++ b/drivers/staging/mt7621-dts/mt7621.dtsi
@@ -429,10 +429,11 @@
 			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";
 
diff --git a/drivers/staging/mt7621-pci/pci-mt7621.c b/drivers/staging/mt7621-pci/pci-mt7621.c
index c49442c9b187..cc89d464ef7f 100644
--- a/drivers/staging/mt7621-pci/pci-mt7621.c
+++ b/drivers/staging/mt7621-pci/pci-mt7621.c
@@ -73,12 +73,6 @@ extern void chk_phy_pll(void);
 
 #define RALINK_PCI_CONFIG_ADDR                         0x20
 #define RALINK_PCI_CONFIG_DATA_VIRTUAL_REG     0x24
-#define SURFBOARDINT_PCIE0       11      /* PCIE0 */
-#define RALINK_INT_PCIE0         SURFBOARDINT_PCIE0
-#define RALINK_INT_PCIE1         SURFBOARDINT_PCIE1
-#define RALINK_INT_PCIE2         SURFBOARDINT_PCIE2
-#define SURFBOARDINT_PCIE1       31     /* PCIE1 */
-#define SURFBOARDINT_PCIE2       32     /* PCIE2 */
 #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 +361,12 @@ 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
@@ -436,20 +374,10 @@ 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);
-#ifdef	CONFIG_DTB_GNUBEE1
-	/*
-	 * 'irq' here is a hwirq, but a virq is needed.  Until we know how and where
-	 * to convert one to the other, we have this hack for the GNUBEE1
-	 * Similarly 31->23 and 32->24.
-	 */
-	if (irq == 11)
-		return 22;
-	if (irq == 31)
-		return 23;
-	if (irq == 32)
-		return 24;
-#endif
 	return irq;
 }