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Diffstat (limited to 'arch/mips/emma2rh/common/irq_emma2rh.c')
-rw-r--r--arch/mips/emma2rh/common/irq_emma2rh.c134
1 files changed, 134 insertions, 0 deletions
diff --git a/arch/mips/emma2rh/common/irq_emma2rh.c b/arch/mips/emma2rh/common/irq_emma2rh.c
new file mode 100644
index 00000000000..b886aa94ca9
--- /dev/null
+++ b/arch/mips/emma2rh/common/irq_emma2rh.c
@@ -0,0 +1,134 @@
+/*
+ * arch/mips/emma2rh/common/irq_emma2rh.c
+ * This file defines the irq handler for EMMA2RH.
+ *
+ * Copyright (C) NEC Electronics Corporation 2005-2006
+ *
+ * This file is based on the arch/mips/ddb5xxx/ddb5477/irq_5477.c
+ *
+ * Copyright 2001 MontaVista Software Inc.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
+ */
+
+/*
+ * EMMA2RH defines 64 IRQs.
+ *
+ * This file exports one function:
+ * emma2rh_irq_init(u32 irq_base);
+ */
+
+#include <linux/interrupt.h>
+#include <linux/types.h>
+#include <linux/ptrace.h>
+
+#include <asm/debug.h>
+
+#include <asm/emma2rh/emma2rh.h>
+
+/* number of total irqs supported by EMMA2RH */
+#define NUM_EMMA2RH_IRQ 96
+
+static int emma2rh_irq_base = -1;
+
+void ll_emma2rh_irq_enable(int);
+void ll_emma2rh_irq_disable(int);
+
+static void emma2rh_irq_enable(unsigned int irq)
+{
+ ll_emma2rh_irq_enable(irq - emma2rh_irq_base);
+}
+
+static void emma2rh_irq_disable(unsigned int irq)
+{
+ ll_emma2rh_irq_disable(irq - emma2rh_irq_base);
+}
+
+static unsigned int emma2rh_irq_startup(unsigned int irq)
+{
+ emma2rh_irq_enable(irq);
+ return 0;
+}
+
+#define emma2rh_irq_shutdown emma2rh_irq_disable
+
+static void emma2rh_irq_ack(unsigned int irq)
+{
+ /* disable interrupt - some handler will re-enable the irq
+ * and if the interrupt is leveled, we will have infinite loop
+ */
+ ll_emma2rh_irq_disable(irq - emma2rh_irq_base);
+}
+
+static void emma2rh_irq_end(unsigned int irq)
+{
+ if (!(irq_desc[irq].status & (IRQ_DISABLED | IRQ_INPROGRESS)))
+ ll_emma2rh_irq_enable(irq - emma2rh_irq_base);
+}
+
+hw_irq_controller emma2rh_irq_controller = {
+ .typename = "emma2rh_irq",
+ .startup = emma2rh_irq_startup,
+ .shutdown = emma2rh_irq_shutdown,
+ .enable = emma2rh_irq_enable,
+ .disable = emma2rh_irq_disable,
+ .ack = emma2rh_irq_ack,
+ .end = emma2rh_irq_end,
+ .set_affinity = NULL /* no affinity stuff for UP */
+};
+
+void emma2rh_irq_init(u32 irq_base)
+{
+ u32 i;
+
+ for (i = irq_base; i < irq_base + NUM_EMMA2RH_IRQ; i++) {
+ irq_desc[i].status = IRQ_DISABLED;
+ irq_desc[i].action = NULL;
+ irq_desc[i].depth = 1;
+ irq_desc[i].handler = &emma2rh_irq_controller;
+ }
+
+ emma2rh_irq_base = irq_base;
+}
+
+void ll_emma2rh_irq_enable(int emma2rh_irq)
+{
+ u32 reg_value;
+ u32 reg_bitmask;
+ u32 reg_index;
+
+ reg_index = EMMA2RH_BHIF_INT_EN_0
+ + (EMMA2RH_BHIF_INT_EN_1 - EMMA2RH_BHIF_INT_EN_0)
+ * (emma2rh_irq / 32);
+ reg_value = emma2rh_in32(reg_index);
+ reg_bitmask = 0x1 << (emma2rh_irq % 32);
+ db_assert((reg_value & reg_bitmask) == 0);
+ emma2rh_out32(reg_index, reg_value | reg_bitmask);
+}
+
+void ll_emma2rh_irq_disable(int emma2rh_irq)
+{
+ u32 reg_value;
+ u32 reg_bitmask;
+ u32 reg_index;
+
+ reg_index = EMMA2RH_BHIF_INT_EN_0
+ + (EMMA2RH_BHIF_INT_EN_1 - EMMA2RH_BHIF_INT_EN_0)
+ * (emma2rh_irq / 32);
+ reg_value = emma2rh_in32(reg_index);
+ reg_bitmask = 0x1 << (emma2rh_irq % 32);
+ db_assert((reg_value & reg_bitmask) != 0);
+ emma2rh_out32(reg_index, reg_value & ~reg_bitmask);
+}