MIPS: ath79: add IRQ handling code for the QCA955X SoCs

The IRQ routing in the QCA955x SoCs is slightly
different from the routing implemented in the
already supported SoCs.

Cc: Rodriguez, Luis <rodrigue@qca.qualcomm.com>
Cc: Giori, Kathy <kgiori@qca.qualcomm.com>
Cc: QCA Linux Team <qca-linux-team@qca.qualcomm.com>
Signed-off-by: Gabor Juhos <juhosg@openwrt.org>
Patchwork: http://patchwork.linux-mips.org/patch/4955/
Signed-off-by: John Crispin <blogic@openwrt.org>

diff --git a/arch/mips/ath79/irq.c b/arch/mips/ath79/irq.c
index df88d49..9c0e176 100644 (file)
--- a/arch/mips/ath79/irq.c
+++ b/arch/mips/ath79/irq.c
@@ -103,7 +103,10 @@ static void __init ath79_misc_irq_init(void)
 
        if (soc_is_ar71xx() || soc_is_ar913x())
                ath79_misc_irq_chip.irq_mask_ack = ar71xx_misc_irq_mask;
-       else if (soc_is_ar724x() || soc_is_ar933x() || soc_is_ar934x())
+       else if (soc_is_ar724x() ||
+                soc_is_ar933x() ||
+                soc_is_ar934x() ||
+                soc_is_qca955x())
                ath79_misc_irq_chip.irq_ack = ar724x_misc_irq_ack;
        else
                BUG();
@@ -150,6 +153,88 @@ static void ar934x_ip2_irq_init(void)
        irq_set_chained_handler(ATH79_CPU_IRQ(2), ar934x_ip2_irq_dispatch);
 }
 
+static void qca955x_ip2_irq_dispatch(unsigned int irq, struct irq_desc *desc)
+{
+       u32 status;
+
+       disable_irq_nosync(irq);
+
+       status = ath79_reset_rr(QCA955X_RESET_REG_EXT_INT_STATUS);
+       status &= QCA955X_EXT_INT_PCIE_RC1_ALL | QCA955X_EXT_INT_WMAC_ALL;
+
+       if (status == 0) {
+               spurious_interrupt();
+               goto enable;
+       }
+
+       if (status & QCA955X_EXT_INT_PCIE_RC1_ALL) {
+               /* TODO: flush DDR? */
+               generic_handle_irq(ATH79_IP2_IRQ(0));
+       }
+
+       if (status & QCA955X_EXT_INT_WMAC_ALL) {
+               /* TODO: flush DDR? */
+               generic_handle_irq(ATH79_IP2_IRQ(1));
+       }
+
+enable:
+       enable_irq(irq);
+}
+
+static void qca955x_ip3_irq_dispatch(unsigned int irq, struct irq_desc *desc)
+{
+       u32 status;
+
+       disable_irq_nosync(irq);
+
+       status = ath79_reset_rr(QCA955X_RESET_REG_EXT_INT_STATUS);
+       status &= QCA955X_EXT_INT_PCIE_RC2_ALL |
+                 QCA955X_EXT_INT_USB1 |
+                 QCA955X_EXT_INT_USB2;
+
+       if (status == 0) {
+               spurious_interrupt();
+               goto enable;
+       }
+
+       if (status & QCA955X_EXT_INT_USB1) {
+               /* TODO: flush DDR? */
+               generic_handle_irq(ATH79_IP3_IRQ(0));
+       }
+
+       if (status & QCA955X_EXT_INT_USB2) {
+               /* TODO: flush DDR? */
+               generic_handle_irq(ATH79_IP3_IRQ(1));
+       }
+
+       if (status & QCA955X_EXT_INT_PCIE_RC2_ALL) {
+               /* TODO: flush DDR? */
+               generic_handle_irq(ATH79_IP3_IRQ(2));
+       }
+
+enable:
+       enable_irq(irq);
+}
+
+static void qca955x_irq_init(void)
+{
+       int i;
+
+       for (i = ATH79_IP2_IRQ_BASE;
+            i < ATH79_IP2_IRQ_BASE + ATH79_IP2_IRQ_COUNT; i++)
+               irq_set_chip_and_handler(i, &dummy_irq_chip,
+                                        handle_level_irq);
+
+       irq_set_chained_handler(ATH79_CPU_IRQ(2), qca955x_ip2_irq_dispatch);
+
+       for (i = ATH79_IP3_IRQ_BASE;
+            i < ATH79_IP3_IRQ_BASE + ATH79_IP3_IRQ_COUNT; i++)
+               irq_set_chip_and_handler(i, &dummy_irq_chip,
+                                        handle_level_irq);
+
+       irq_set_chained_handler(ATH79_CPU_IRQ(3), qca955x_ip3_irq_dispatch);
+}
+
 asmlinkage void plat_irq_dispatch(void)
 {
        unsigned long pending;
@@ -185,6 +270,17 @@ asmlinkage void plat_irq_dispatch(void)
  * Issue a flush in the handlers to ensure that the driver sees
  * the update.
  */
+
+static void ath79_default_ip2_handler(void)
+{
+       do_IRQ(ATH79_CPU_IRQ(2));
+}
+
+static void ath79_default_ip3_handler(void)
+{
+       do_IRQ(ATH79_CPU_IRQ(3));
+}
+
 static void ar71xx_ip2_handler(void)
 {
        ath79_ddr_wb_flush(AR71XX_DDR_REG_FLUSH_PCI);
@@ -209,11 +305,6 @@ static void ar933x_ip2_handler(void)
        do_IRQ(ATH79_CPU_IRQ(2));
 }
 
-static void ar934x_ip2_handler(void)
-{
-       do_IRQ(ATH79_CPU_IRQ(2));
-}
-
 static void ar71xx_ip3_handler(void)
 {
        ath79_ddr_wb_flush(AR71XX_DDR_REG_FLUSH_USB);
@@ -259,8 +350,11 @@ void __init arch_init_irq(void)
                ath79_ip2_handler = ar933x_ip2_handler;
                ath79_ip3_handler = ar933x_ip3_handler;
        } else if (soc_is_ar934x()) {
-               ath79_ip2_handler = ar934x_ip2_handler;
+               ath79_ip2_handler = ath79_default_ip2_handler;
                ath79_ip3_handler = ar934x_ip3_handler;
+       } else if (soc_is_qca955x()) {
+               ath79_ip2_handler = ath79_default_ip2_handler;
+               ath79_ip3_handler = ath79_default_ip3_handler;
        } else {
                BUG();
        }
@@ -271,4 +365,6 @@ void __init arch_init_irq(void)
 
        if (soc_is_ar934x())
                ar934x_ip2_irq_init();
+       else if (soc_is_qca955x())
+               qca955x_irq_init();
 }

diff --git a/arch/mips/include/asm/mach-ath79/ar71xx_regs.h b/arch/mips/include/asm/mach-ath79/ar71xx_regs.h
index 7b00e12..8782d8b 100644 (file)
--- a/arch/mips/include/asm/mach-ath79/ar71xx_regs.h
+++ b/arch/mips/include/asm/mach-ath79/ar71xx_regs.h
@@ -300,6 +300,7 @@
 #define AR934X_RESET_REG_PCIE_WMAC_INT_STATUS  0xac
 
 #define QCA955X_RESET_REG_BOOTSTRAP            0xb0
+#define QCA955X_RESET_REG_EXT_INT_STATUS       0xac
 
 #define MISC_INT_ETHSW                 BIT(12)
 #define MISC_INT_TIMER4                        BIT(10)
@@ -398,6 +399,37 @@
         AR934X_PCIE_WMAC_INT_PCIE_RC1 | AR934X_PCIE_WMAC_INT_PCIE_RC2 | \
         AR934X_PCIE_WMAC_INT_PCIE_RC3)
 
+#define QCA955X_EXT_INT_WMAC_MISC              BIT(0)
+#define QCA955X_EXT_INT_WMAC_TX                        BIT(1)
+#define QCA955X_EXT_INT_WMAC_RXLP              BIT(2)
+#define QCA955X_EXT_INT_WMAC_RXHP              BIT(3)
+#define QCA955X_EXT_INT_PCIE_RC1               BIT(4)
+#define QCA955X_EXT_INT_PCIE_RC1_INT0          BIT(5)
+#define QCA955X_EXT_INT_PCIE_RC1_INT1          BIT(6)
+#define QCA955X_EXT_INT_PCIE_RC1_INT2          BIT(7)
+#define QCA955X_EXT_INT_PCIE_RC1_INT3          BIT(8)
+#define QCA955X_EXT_INT_PCIE_RC2               BIT(12)
+#define QCA955X_EXT_INT_PCIE_RC2_INT0          BIT(13)
+#define QCA955X_EXT_INT_PCIE_RC2_INT1          BIT(14)
+#define QCA955X_EXT_INT_PCIE_RC2_INT2          BIT(15)
+#define QCA955X_EXT_INT_PCIE_RC2_INT3          BIT(16)
+#define QCA955X_EXT_INT_USB1                   BIT(24)
+#define QCA955X_EXT_INT_USB2                   BIT(28)
+
+#define QCA955X_EXT_INT_WMAC_ALL \
+       (QCA955X_EXT_INT_WMAC_MISC | QCA955X_EXT_INT_WMAC_TX | \
+        QCA955X_EXT_INT_WMAC_RXLP | QCA955X_EXT_INT_WMAC_RXHP)
+
+#define QCA955X_EXT_INT_PCIE_RC1_ALL \
+       (QCA955X_EXT_INT_PCIE_RC1 | QCA955X_EXT_INT_PCIE_RC1_INT0 | \
+        QCA955X_EXT_INT_PCIE_RC1_INT1 | QCA955X_EXT_INT_PCIE_RC1_INT2 | \
+        QCA955X_EXT_INT_PCIE_RC1_INT3)
+
+#define QCA955X_EXT_INT_PCIE_RC2_ALL \
+       (QCA955X_EXT_INT_PCIE_RC2 | QCA955X_EXT_INT_PCIE_RC2_INT0 | \
+        QCA955X_EXT_INT_PCIE_RC2_INT1 | QCA955X_EXT_INT_PCIE_RC2_INT2 | \
+        QCA955X_EXT_INT_PCIE_RC2_INT3)
+
 #define REV_ID_MAJOR_MASK              0xfff0
 #define REV_ID_MAJOR_AR71XX            0x00a0
 #define REV_ID_MAJOR_AR913X            0x00b0

diff --git a/arch/mips/include/asm/mach-ath79/irq.h b/arch/mips/include/asm/mach-ath79/irq.h
index 23e2bba..5c9ca76 100644 (file)
--- a/arch/mips/include/asm/mach-ath79/irq.h
+++ b/arch/mips/include/asm/mach-ath79/irq.h
@@ -10,7 +10,7 @@
 #define __ASM_MACH_ATH79_IRQ_H
 
 #define MIPS_CPU_IRQ_BASE      0
-#define NR_IRQS                        48
+#define NR_IRQS                        51
 
 #define ATH79_CPU_IRQ(_x)      (MIPS_CPU_IRQ_BASE + (_x))
 
@@ -26,6 +26,10 @@
 #define ATH79_IP2_IRQ_COUNT    2
 #define ATH79_IP2_IRQ(_x)      (ATH79_IP2_IRQ_BASE + (_x))
 
+#define ATH79_IP3_IRQ_BASE     (ATH79_IP2_IRQ_BASE + ATH79_IP2_IRQ_COUNT)
+#define ATH79_IP3_IRQ_COUNT     3
+#define ATH79_IP3_IRQ(_x)       (ATH79_IP3_IRQ_BASE + (_x))
+
 #include_next <irq.h>
 
 #endif /* __ASM_MACH_ATH79_IRQ_H */