patch-2.4.22 linux-2.4.22/arch/sh/overdrive/irq.c
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- Lines: 193
- Date:
2003-08-25 04:44:40.000000000 -0700
- Orig file:
linux-2.4.21/arch/sh/overdrive/irq.c
- Orig date:
1969-12-31 16:00:00.000000000 -0800
diff -urN linux-2.4.21/arch/sh/overdrive/irq.c linux-2.4.22/arch/sh/overdrive/irq.c
@@ -0,0 +1,192 @@
+/*
+ * Copyright (C) 2000 David J. Mckay (david.mckay@st.com)
+ *
+ * May be copied or modified under the terms of the GNU General Public
+ * License. See linux/COPYING for more information.
+ *
+ * Looks after interrupts on the overdrive board.
+ *
+ * Bases on the IPR irq system
+ */
+
+#include <linux/config.h>
+#include <linux/init.h>
+#include <linux/irq.h>
+
+#include <asm/system.h>
+#include <asm/io.h>
+
+#include "overdrive.h"
+
+struct od_data {
+ int overdrive_irq;
+ int irq_mask;
+};
+
+#define NUM_EXTERNAL_IRQS 16
+#define EXTERNAL_IRQ_NOT_IN_USE (-1)
+#define EXTERNAL_IRQ_NOT_ASSIGNED (-1)
+
+/*
+ * This table is used to determine what to program into the FPGA's CT register
+ * for the specified Linux IRQ.
+ *
+ * The irq_mask gives the interrupt number from the PCI board (PCI_Int(6:0))
+ * but is one greater than that because the because the FPGA treats 0
+ * as disabled, a value of 1 asserts PCI_Int0, and so on.
+ *
+ * The overdrive_irq specifies which of the eight interrupt sources generates
+ * that interrupt, and but is multiplied by four to give the bit offset into
+ * the CT register.
+ *
+ * The seven interrupts levels (SH4 IRL's) we have available here is hardwired
+ * by the EPLD. The assignments here of which PCI interrupt generates each
+ * level is arbitary.
+ */
+static struct od_data od_data_table[NUM_EXTERNAL_IRQS] = {
+ /* overdrive_irq , irq_mask */
+ {EXTERNAL_IRQ_NOT_ASSIGNED, EXTERNAL_IRQ_NOT_IN_USE}, /* 0 */
+ {EXTERNAL_IRQ_NOT_ASSIGNED, 7}, /* 1 */
+ {EXTERNAL_IRQ_NOT_ASSIGNED, 6}, /* 2 */
+ {EXTERNAL_IRQ_NOT_ASSIGNED, EXTERNAL_IRQ_NOT_IN_USE}, /* 3 */
+ {EXTERNAL_IRQ_NOT_ASSIGNED, 5}, /* 4 */
+ {EXTERNAL_IRQ_NOT_ASSIGNED, EXTERNAL_IRQ_NOT_IN_USE}, /* 5 */
+ {EXTERNAL_IRQ_NOT_ASSIGNED, EXTERNAL_IRQ_NOT_IN_USE}, /* 6 */
+ {EXTERNAL_IRQ_NOT_ASSIGNED, 4}, /* 7 */
+ {EXTERNAL_IRQ_NOT_ASSIGNED, EXTERNAL_IRQ_NOT_IN_USE}, /* 8 */
+ {EXTERNAL_IRQ_NOT_ASSIGNED, EXTERNAL_IRQ_NOT_IN_USE}, /* 9 */
+ {EXTERNAL_IRQ_NOT_ASSIGNED, 3}, /* 10 */
+ {EXTERNAL_IRQ_NOT_ASSIGNED, 2}, /* 11 */
+ {EXTERNAL_IRQ_NOT_ASSIGNED, EXTERNAL_IRQ_NOT_IN_USE}, /* 12 */
+ {EXTERNAL_IRQ_NOT_ASSIGNED, 1}, /* 13 */
+ {EXTERNAL_IRQ_NOT_ASSIGNED, EXTERNAL_IRQ_NOT_IN_USE}, /* 14 */
+ {EXTERNAL_IRQ_NOT_ASSIGNED, EXTERNAL_IRQ_NOT_IN_USE} /* 15 */
+};
+
+static void set_od_data(int overdrive_irq, int irq)
+{
+ if (irq >= NUM_EXTERNAL_IRQS || irq < 0)
+ return;
+ od_data_table[irq].overdrive_irq = overdrive_irq << 2;
+}
+
+static void enable_od_irq(unsigned int irq);
+void disable_od_irq(unsigned int irq);
+
+/* shutdown is same as "disable" */
+#define shutdown_od_irq disable_od_irq
+
+static void mask_and_ack_od(unsigned int);
+static void end_od_irq(unsigned int irq);
+
+static unsigned int startup_od_irq(unsigned int irq)
+{
+ enable_od_irq(irq);
+ return 0; /* never anything pending */
+}
+
+static struct hw_interrupt_type od_irq_type = {
+ "Overdrive-IRQ",
+ startup_od_irq,
+ shutdown_od_irq,
+ enable_od_irq,
+ disable_od_irq,
+ mask_and_ack_od,
+ end_od_irq
+};
+
+static void disable_od_irq(unsigned int irq)
+{
+ unsigned val, flags;
+ int overdrive_irq;
+ unsigned mask;
+
+ /* Not a valid interrupt */
+ if (irq < 0 || irq >= NUM_EXTERNAL_IRQS)
+ return;
+
+ /* Is is necessary to use a cli here? Would a spinlock not be
+ * mroe efficient?
+ */
+ save_and_cli(flags);
+ overdrive_irq = od_data_table[irq].overdrive_irq;
+ if (overdrive_irq != EXTERNAL_IRQ_NOT_ASSIGNED) {
+ mask = ~(0x7 << overdrive_irq);
+ val = ctrl_inl(OVERDRIVE_INT_CT);
+ val &= mask;
+ ctrl_outl(val, OVERDRIVE_INT_CT);
+ }
+ restore_flags(flags);
+}
+
+static void enable_od_irq(unsigned int irq)
+{
+ unsigned val, flags;
+ int overdrive_irq;
+ unsigned mask;
+
+ /* Not a valid interrupt */
+ if (irq < 0 || irq >= NUM_EXTERNAL_IRQS)
+ return;
+
+ /* Set priority in OD back to original value */
+ save_and_cli(flags);
+ /* This one is not in use currently */
+ overdrive_irq = od_data_table[irq].overdrive_irq;
+ if (overdrive_irq != EXTERNAL_IRQ_NOT_ASSIGNED) {
+ val = ctrl_inl(OVERDRIVE_INT_CT);
+ mask = ~(0x7 << overdrive_irq);
+ val &= mask;
+ mask = od_data_table[irq].irq_mask << overdrive_irq;
+ val |= mask;
+ ctrl_outl(val, OVERDRIVE_INT_CT);
+ }
+ restore_flags(flags);
+}
+
+
+
+/* this functions sets the desired irq handler to be an overdrive type */
+static void __init make_od_irq(unsigned int irq)
+{
+ disable_irq_nosync(irq);
+ irq_desc[irq].handler = &od_irq_type;
+ disable_od_irq(irq);
+}
+
+
+static void mask_and_ack_od(unsigned int irq)
+{
+ disable_od_irq(irq);
+}
+
+static void end_od_irq(unsigned int irq)
+{
+ enable_od_irq(irq);
+}
+
+void __init init_overdrive_irq(void)
+{
+ int i;
+
+ /* Disable all interrupts */
+ ctrl_outl(0, OVERDRIVE_INT_CT);
+
+ /* Update interrupt pin mode to use encoded interrupts */
+ i = ctrl_inw(INTC_ICR);
+ i &= ~INTC_ICR_IRLM;
+ ctrl_outw(i, INTC_ICR);
+
+ for (i = 0; i < NUM_EXTERNAL_IRQS; i++) {
+ if (od_data_table[i].irq_mask != EXTERNAL_IRQ_NOT_IN_USE) {
+ make_od_irq(i);
+ } else if (i != 15) { // Cannot use imask on level 15
+ make_imask_irq(i);
+ }
+ }
+
+ /* Set up the interrupts */
+ set_od_data(OVERDRIVE_PCI_INTA, OVERDRIVE_PCI_IRQ1);
+ set_od_data(OVERDRIVE_PCI_INTB, OVERDRIVE_PCI_IRQ2);
+ set_od_data(OVERDRIVE_AUDIO_INT, OVERDRIVE_ESS_IRQ);
+}
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