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-rw-r--r--arch/mips/ath79/irq.c369
1 files changed, 369 insertions, 0 deletions
diff --git a/arch/mips/ath79/irq.c b/arch/mips/ath79/irq.c
new file mode 100644
index 000000000..6adae366f
--- /dev/null
+++ b/arch/mips/ath79/irq.c
@@ -0,0 +1,369 @@
+/*
+ * Atheros AR71xx/AR724x/AR913x specific interrupt handling
+ *
+ * Copyright (C) 2010-2011 Jaiganesh Narayanan <jnarayanan@atheros.com>
+ * Copyright (C) 2008-2011 Gabor Juhos <juhosg@openwrt.org>
+ * Copyright (C) 2008 Imre Kaloz <kaloz@openwrt.org>
+ *
+ * Parts of this file are based on Atheros' 2.6.15/2.6.31 BSP
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 2 as published
+ * by the Free Software Foundation.
+ */
+
+#include <linux/kernel.h>
+#include <linux/init.h>
+#include <linux/interrupt.h>
+#include <linux/irq.h>
+
+#include <asm/irq_cpu.h>
+#include <asm/mipsregs.h>
+
+#include <asm/mach-ath79/ath79.h>
+#include <asm/mach-ath79/ar71xx_regs.h>
+#include "common.h"
+
+static void (*ath79_ip2_handler)(void);
+static void (*ath79_ip3_handler)(void);
+
+static void ath79_misc_irq_handler(unsigned int irq, struct irq_desc *desc)
+{
+ void __iomem *base = ath79_reset_base;
+ u32 pending;
+
+ pending = __raw_readl(base + AR71XX_RESET_REG_MISC_INT_STATUS) &
+ __raw_readl(base + AR71XX_RESET_REG_MISC_INT_ENABLE);
+
+ if (!pending) {
+ spurious_interrupt();
+ return;
+ }
+
+ while (pending) {
+ int bit = __ffs(pending);
+
+ generic_handle_irq(ATH79_MISC_IRQ(bit));
+ pending &= ~BIT(bit);
+ }
+}
+
+static void ar71xx_misc_irq_unmask(struct irq_data *d)
+{
+ unsigned int irq = d->irq - ATH79_MISC_IRQ_BASE;
+ void __iomem *base = ath79_reset_base;
+ u32 t;
+
+ t = __raw_readl(base + AR71XX_RESET_REG_MISC_INT_ENABLE);
+ __raw_writel(t | (1 << irq), base + AR71XX_RESET_REG_MISC_INT_ENABLE);
+
+ /* flush write */
+ __raw_readl(base + AR71XX_RESET_REG_MISC_INT_ENABLE);
+}
+
+static void ar71xx_misc_irq_mask(struct irq_data *d)
+{
+ unsigned int irq = d->irq - ATH79_MISC_IRQ_BASE;
+ void __iomem *base = ath79_reset_base;
+ u32 t;
+
+ t = __raw_readl(base + AR71XX_RESET_REG_MISC_INT_ENABLE);
+ __raw_writel(t & ~(1 << irq), base + AR71XX_RESET_REG_MISC_INT_ENABLE);
+
+ /* flush write */
+ __raw_readl(base + AR71XX_RESET_REG_MISC_INT_ENABLE);
+}
+
+static void ar724x_misc_irq_ack(struct irq_data *d)
+{
+ unsigned int irq = d->irq - ATH79_MISC_IRQ_BASE;
+ void __iomem *base = ath79_reset_base;
+ u32 t;
+
+ t = __raw_readl(base + AR71XX_RESET_REG_MISC_INT_STATUS);
+ __raw_writel(t & ~(1 << irq), base + AR71XX_RESET_REG_MISC_INT_STATUS);
+
+ /* flush write */
+ __raw_readl(base + AR71XX_RESET_REG_MISC_INT_STATUS);
+}
+
+static struct irq_chip ath79_misc_irq_chip = {
+ .name = "MISC",
+ .irq_unmask = ar71xx_misc_irq_unmask,
+ .irq_mask = ar71xx_misc_irq_mask,
+};
+
+static void __init ath79_misc_irq_init(void)
+{
+ void __iomem *base = ath79_reset_base;
+ int i;
+
+ __raw_writel(0, base + AR71XX_RESET_REG_MISC_INT_ENABLE);
+ __raw_writel(0, base + AR71XX_RESET_REG_MISC_INT_STATUS);
+
+ 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() ||
+ soc_is_qca955x())
+ ath79_misc_irq_chip.irq_ack = ar724x_misc_irq_ack;
+ else
+ BUG();
+
+ for (i = ATH79_MISC_IRQ_BASE;
+ i < ATH79_MISC_IRQ_BASE + ATH79_MISC_IRQ_COUNT; i++) {
+ irq_set_chip_and_handler(i, &ath79_misc_irq_chip,
+ handle_level_irq);
+ }
+
+ irq_set_chained_handler(ATH79_CPU_IRQ(6), ath79_misc_irq_handler);
+}
+
+static void ar934x_ip2_irq_dispatch(unsigned int irq, struct irq_desc *desc)
+{
+ u32 status;
+
+ disable_irq_nosync(irq);
+
+ status = ath79_reset_rr(AR934X_RESET_REG_PCIE_WMAC_INT_STATUS);
+
+ if (status & AR934X_PCIE_WMAC_INT_PCIE_ALL) {
+ ath79_ddr_wb_flush(AR934X_DDR_REG_FLUSH_PCIE);
+ generic_handle_irq(ATH79_IP2_IRQ(0));
+ } else if (status & AR934X_PCIE_WMAC_INT_WMAC_ALL) {
+ ath79_ddr_wb_flush(AR934X_DDR_REG_FLUSH_WMAC);
+ generic_handle_irq(ATH79_IP2_IRQ(1));
+ } else {
+ spurious_interrupt();
+ }
+
+ enable_irq(irq);
+}
+
+static void ar934x_ip2_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), 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;
+
+ pending = read_c0_status() & read_c0_cause() & ST0_IM;
+
+ if (pending & STATUSF_IP7)
+ do_IRQ(ATH79_CPU_IRQ(7));
+
+ else if (pending & STATUSF_IP2)
+ ath79_ip2_handler();
+
+ else if (pending & STATUSF_IP4)
+ do_IRQ(ATH79_CPU_IRQ(4));
+
+ else if (pending & STATUSF_IP5)
+ do_IRQ(ATH79_CPU_IRQ(5));
+
+ else if (pending & STATUSF_IP3)
+ ath79_ip3_handler();
+
+ else if (pending & STATUSF_IP6)
+ do_IRQ(ATH79_CPU_IRQ(6));
+
+ else
+ spurious_interrupt();
+}
+
+/*
+ * The IP2/IP3 lines are tied to a PCI/WMAC/USB device. Drivers for
+ * these devices typically allocate coherent DMA memory, however the
+ * DMA controller may still have some unsynchronized data in the FIFO.
+ * 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);
+ do_IRQ(ATH79_CPU_IRQ(2));
+}
+
+static void ar724x_ip2_handler(void)
+{
+ ath79_ddr_wb_flush(AR724X_DDR_REG_FLUSH_PCIE);
+ do_IRQ(ATH79_CPU_IRQ(2));
+}
+
+static void ar913x_ip2_handler(void)
+{
+ ath79_ddr_wb_flush(AR913X_DDR_REG_FLUSH_WMAC);
+ do_IRQ(ATH79_CPU_IRQ(2));
+}
+
+static void ar933x_ip2_handler(void)
+{
+ ath79_ddr_wb_flush(AR933X_DDR_REG_FLUSH_WMAC);
+ do_IRQ(ATH79_CPU_IRQ(2));
+}
+
+static void ar71xx_ip3_handler(void)
+{
+ ath79_ddr_wb_flush(AR71XX_DDR_REG_FLUSH_USB);
+ do_IRQ(ATH79_CPU_IRQ(3));
+}
+
+static void ar724x_ip3_handler(void)
+{
+ ath79_ddr_wb_flush(AR724X_DDR_REG_FLUSH_USB);
+ do_IRQ(ATH79_CPU_IRQ(3));
+}
+
+static void ar913x_ip3_handler(void)
+{
+ ath79_ddr_wb_flush(AR913X_DDR_REG_FLUSH_USB);
+ do_IRQ(ATH79_CPU_IRQ(3));
+}
+
+static void ar933x_ip3_handler(void)
+{
+ ath79_ddr_wb_flush(AR933X_DDR_REG_FLUSH_USB);
+ do_IRQ(ATH79_CPU_IRQ(3));
+}
+
+static void ar934x_ip3_handler(void)
+{
+ ath79_ddr_wb_flush(AR934X_DDR_REG_FLUSH_USB);
+ do_IRQ(ATH79_CPU_IRQ(3));
+}
+
+void __init arch_init_irq(void)
+{
+ if (soc_is_ar71xx()) {
+ ath79_ip2_handler = ar71xx_ip2_handler;
+ ath79_ip3_handler = ar71xx_ip3_handler;
+ } else if (soc_is_ar724x()) {
+ ath79_ip2_handler = ar724x_ip2_handler;
+ ath79_ip3_handler = ar724x_ip3_handler;
+ } else if (soc_is_ar913x()) {
+ ath79_ip2_handler = ar913x_ip2_handler;
+ ath79_ip3_handler = ar913x_ip3_handler;
+ } else if (soc_is_ar933x()) {
+ ath79_ip2_handler = ar933x_ip2_handler;
+ ath79_ip3_handler = ar933x_ip3_handler;
+ } else if (soc_is_ar934x()) {
+ 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();
+ }
+
+ mips_cpu_irq_init();
+ ath79_misc_irq_init();
+
+ if (soc_is_ar934x())
+ ar934x_ip2_irq_init();
+ else if (soc_is_qca955x())
+ qca955x_irq_init();
+}
generated by cgit v1.2.3-54-g00ecf (git 2.45.2) at 2024-11-05 23:22:35 +0000