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authorAndré Fabian Silva Delgado <emulatorman@parabola.nu>2015-09-08 01:01:14 -0300
committerAndré Fabian Silva Delgado <emulatorman@parabola.nu>2015-09-08 01:01:14 -0300
commite5fd91f1ef340da553f7a79da9540c3db711c937 (patch)
treeb11842027dc6641da63f4bcc524f8678263304a3 /arch/mips/ath79/irq.c
parent2a9b0348e685a63d97486f6749622b61e9e3292f (diff)
Linux-libre 4.2-gnu
Diffstat (limited to 'arch/mips/ath79/irq.c')
-rw-r--r--arch/mips/ath79/irq.c200
1 files changed, 102 insertions, 98 deletions
diff --git a/arch/mips/ath79/irq.c b/arch/mips/ath79/irq.c
index 6adae366f..afb009603 100644
--- a/arch/mips/ath79/irq.c
+++ b/arch/mips/ath79/irq.c
@@ -15,7 +15,9 @@
#include <linux/kernel.h>
#include <linux/init.h>
#include <linux/interrupt.h>
-#include <linux/irq.h>
+#include <linux/irqchip.h>
+#include <linux/of_irq.h>
+#include "../../../drivers/irqchip/irqchip.h"
#include <asm/irq_cpu.h>
#include <asm/mipsregs.h>
@@ -23,9 +25,7 @@
#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);
+#include "machtypes.h"
static void ath79_misc_irq_handler(unsigned int irq, struct irq_desc *desc)
{
@@ -129,10 +129,10 @@ static void ar934x_ip2_irq_dispatch(unsigned int irq, struct irq_desc *desc)
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);
+ ath79_ddr_wb_flush(3);
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);
+ ath79_ddr_wb_flush(4);
generic_handle_irq(ATH79_IP2_IRQ(1));
} else {
spurious_interrupt();
@@ -235,128 +235,132 @@ static void qca955x_irq_init(void)
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.
+ *
+ * This array map the interrupt lines to the DDR write buffer channels.
*/
-static void ath79_default_ip2_handler(void)
-{
- do_IRQ(ATH79_CPU_IRQ(2));
-}
+static unsigned irq_wb_chan[8] = {
+ -1, -1, -1, -1, -1, -1, -1, -1,
+};
-static void ath79_default_ip3_handler(void)
+asmlinkage void plat_irq_dispatch(void)
{
- do_IRQ(ATH79_CPU_IRQ(3));
-}
+ unsigned long pending;
+ int irq;
-static void ar71xx_ip2_handler(void)
-{
- ath79_ddr_wb_flush(AR71XX_DDR_REG_FLUSH_PCI);
- do_IRQ(ATH79_CPU_IRQ(2));
-}
+ pending = read_c0_status() & read_c0_cause() & ST0_IM;
-static void ar724x_ip2_handler(void)
-{
- ath79_ddr_wb_flush(AR724X_DDR_REG_FLUSH_PCIE);
- do_IRQ(ATH79_CPU_IRQ(2));
-}
+ if (!pending) {
+ spurious_interrupt();
+ return;
+ }
-static void ar913x_ip2_handler(void)
-{
- ath79_ddr_wb_flush(AR913X_DDR_REG_FLUSH_WMAC);
- do_IRQ(ATH79_CPU_IRQ(2));
+ pending >>= CAUSEB_IP;
+ while (pending) {
+ irq = fls(pending) - 1;
+ if (irq < ARRAY_SIZE(irq_wb_chan) && irq_wb_chan[irq] != -1)
+ ath79_ddr_wb_flush(irq_wb_chan[irq]);
+ do_IRQ(MIPS_CPU_IRQ_BASE + irq);
+ pending &= ~BIT(irq);
+ }
}
-static void ar933x_ip2_handler(void)
+#ifdef CONFIG_IRQCHIP
+static int misc_map(struct irq_domain *d, unsigned int irq, irq_hw_number_t hw)
{
- ath79_ddr_wb_flush(AR933X_DDR_REG_FLUSH_WMAC);
- do_IRQ(ATH79_CPU_IRQ(2));
+ irq_set_chip_and_handler(irq, &ath79_misc_irq_chip, handle_level_irq);
+ return 0;
}
-static void ar71xx_ip3_handler(void)
-{
- ath79_ddr_wb_flush(AR71XX_DDR_REG_FLUSH_USB);
- do_IRQ(ATH79_CPU_IRQ(3));
-}
+static const struct irq_domain_ops misc_irq_domain_ops = {
+ .xlate = irq_domain_xlate_onecell,
+ .map = misc_map,
+};
-static void ar724x_ip3_handler(void)
+static int __init ath79_misc_intc_of_init(
+ struct device_node *node, struct device_node *parent)
{
- ath79_ddr_wb_flush(AR724X_DDR_REG_FLUSH_USB);
- do_IRQ(ATH79_CPU_IRQ(3));
-}
+ void __iomem *base = ath79_reset_base;
+ struct irq_domain *domain;
+ int irq;
-static void ar913x_ip3_handler(void)
-{
- ath79_ddr_wb_flush(AR913X_DDR_REG_FLUSH_USB);
- do_IRQ(ATH79_CPU_IRQ(3));
-}
+ irq = irq_of_parse_and_map(node, 0);
+ if (!irq)
+ panic("Failed to get MISC IRQ");
-static void ar933x_ip3_handler(void)
-{
- ath79_ddr_wb_flush(AR933X_DDR_REG_FLUSH_USB);
- do_IRQ(ATH79_CPU_IRQ(3));
+ domain = irq_domain_add_legacy(node, ATH79_MISC_IRQ_COUNT,
+ ATH79_MISC_IRQ_BASE, 0, &misc_irq_domain_ops, NULL);
+ if (!domain)
+ panic("Failed to add MISC irqdomain");
+
+ /* Disable and clear all interrupts */
+ __raw_writel(0, base + AR71XX_RESET_REG_MISC_INT_ENABLE);
+ __raw_writel(0, base + AR71XX_RESET_REG_MISC_INT_STATUS);
+
+
+ irq_set_chained_handler(irq, ath79_misc_irq_handler);
+
+ return 0;
}
+IRQCHIP_DECLARE(ath79_misc_intc, "qca,ar7100-misc-intc",
+ ath79_misc_intc_of_init);
-static void ar934x_ip3_handler(void)
+static int __init ar79_cpu_intc_of_init(
+ struct device_node *node, struct device_node *parent)
{
- ath79_ddr_wb_flush(AR934X_DDR_REG_FLUSH_USB);
- do_IRQ(ATH79_CPU_IRQ(3));
+ int err, i, count;
+
+ /* Fill the irq_wb_chan table */
+ count = of_count_phandle_with_args(
+ node, "qca,ddr-wb-channels", "#qca,ddr-wb-channel-cells");
+
+ for (i = 0; i < count; i++) {
+ struct of_phandle_args args;
+ u32 irq = i;
+
+ of_property_read_u32_index(
+ node, "qca,ddr-wb-channel-interrupts", i, &irq);
+ if (irq >= ARRAY_SIZE(irq_wb_chan))
+ continue;
+
+ err = of_parse_phandle_with_args(
+ node, "qca,ddr-wb-channels",
+ "#qca,ddr-wb-channel-cells",
+ i, &args);
+ if (err)
+ return err;
+
+ irq_wb_chan[irq] = args.args[0];
+ pr_info("IRQ: Set flush channel of IRQ%d to %d\n",
+ irq, args.args[0]);
+ }
+
+ return mips_cpu_irq_of_init(node, parent);
}
+IRQCHIP_DECLARE(ar79_cpu_intc, "qca,ar7100-cpu-intc",
+ ar79_cpu_intc_of_init);
+
+#endif
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;
+ if (mips_machtype == ATH79_MACH_GENERIC_OF) {
+ irqchip_init();
+ return;
+ }
+
+ if (soc_is_ar71xx() || soc_is_ar724x() ||
+ soc_is_ar913x() || soc_is_ar933x()) {
+ irq_wb_chan[2] = 3;
+ irq_wb_chan[3] = 2;
} 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();
+ irq_wb_chan[3] = 2;
}
mips_cpu_irq_init();