This commit was manufactured by cvs2svn to create branch 'vserver'.

[linux-2.6.git] / arch / sh / kernel / cpu / irq / pint.c

diff --git a/arch/sh/kernel/cpu/irq/pint.c b/arch/sh/kernel/cpu/irq/pint.c
new file mode 100644 (file)
index 0000000..95d6024
--- /dev/null
+++ b/arch/sh/kernel/cpu/irq/pint.c
@@ -0,0 +1,169 @@
+/*
+ * arch/sh/kernel/cpu/irq/pint.c - Interrupt handling for PINT-based IRQs.
+ *
+ * Copyright (C) 1999  Niibe Yutaka & Takeshi Yaegashi
+ * Copyright (C) 2000  Kazumoto Kojima
+ * Copyright (C) 2003 Takashi Kusuda <kusuda-takashi@hitachi-ul.co.jp>
+ *
+ * This file is subject to the terms and conditions of the GNU General Public
+ * License.  See the file "COPYING" in the main directory of this archive
+ * for more details.
+ */
+
+#include <linux/config.h>
+#include <linux/init.h>
+#include <linux/irq.h>
+#include <linux/module.h>
+
+#include <asm/system.h>
+#include <asm/io.h>
+#include <asm/machvec.h>
+
+static unsigned char pint_map[256];
+static unsigned long portcr_mask;
+
+static void enable_pint_irq(unsigned int irq);
+static void disable_pint_irq(unsigned int irq);
+
+/* shutdown is same as "disable" */
+#define shutdown_pint_irq disable_pint_irq
+
+static void mask_and_ack_pint(unsigned int);
+static void end_pint_irq(unsigned int irq);
+
+static unsigned int startup_pint_irq(unsigned int irq)
+{
+       enable_pint_irq(irq);
+       return 0; /* never anything pending */
+}
+
+static struct hw_interrupt_type pint_irq_type = {
+       .typename = "PINT-IRQ",
+       .startup = startup_pint_irq,
+       .shutdown = shutdown_pint_irq,
+       .enable = enable_pint_irq,
+       .disable = disable_pint_irq,
+       .ack = mask_and_ack_pint,
+       .end = end_pint_irq
+};
+
+static void disable_pint_irq(unsigned int irq)
+{
+       unsigned long val, flags;
+
+       local_irq_save(flags);
+       val = ctrl_inw(INTC_INTER);
+       val &= ~(1 << (irq - PINT_IRQ_BASE));
+       ctrl_outw(val, INTC_INTER);     /* disable PINTn */
+       portcr_mask &= ~(3 << (irq - PINT_IRQ_BASE)*2);
+       local_irq_restore(flags);
+}
+
+static void enable_pint_irq(unsigned int irq)
+{
+       unsigned long val, flags;
+
+       local_irq_save(flags);
+       val = ctrl_inw(INTC_INTER);
+       val |= 1 << (irq - PINT_IRQ_BASE);
+       ctrl_outw(val, INTC_INTER);     /* enable PINTn */
+       portcr_mask |= 3 << (irq - PINT_IRQ_BASE)*2;
+       local_irq_restore(flags);
+}
+
+static void mask_and_ack_pint(unsigned int irq)
+{
+       disable_pint_irq(irq);
+}
+
+static void end_pint_irq(unsigned int irq)
+{
+       if (!(irq_desc[irq].status & (IRQ_DISABLED|IRQ_INPROGRESS)))
+               enable_pint_irq(irq);
+}
+
+void make_pint_irq(unsigned int irq)
+{
+       disable_irq_nosync(irq);
+       irq_desc[irq].handler = &pint_irq_type;
+       disable_pint_irq(irq);
+}
+
+void __init init_IRQ_pint(void)
+{
+       int i;
+
+       make_ipr_irq(PINT0_IRQ, PINT0_IPR_ADDR, PINT0_IPR_POS, PINT0_PRIORITY);
+       make_ipr_irq(PINT8_IRQ, PINT8_IPR_ADDR, PINT8_IPR_POS, PINT8_PRIORITY);
+
+       enable_irq(PINT0_IRQ);
+       enable_irq(PINT8_IRQ);
+
+       for(i = 0; i < 16; i++)
+               make_pint_irq(PINT_IRQ_BASE + i);
+
+       for(i = 0; i < 256; i++) {
+               if (i & 1)
+                       pint_map[i] = 0;
+               else if (i & 2)
+                       pint_map[i] = 1;
+               else if (i & 4)
+                       pint_map[i] = 2;
+               else if (i & 8)
+                       pint_map[i] = 3;
+               else if (i & 0x10)
+                       pint_map[i] = 4;
+               else if (i & 0x20)
+                       pint_map[i] = 5;
+               else if (i & 0x40)
+                       pint_map[i] = 6;
+               else if (i & 0x80)
+                       pint_map[i] = 7;
+       }
+}
+
+int ipr_irq_demux(int irq)
+{
+       unsigned long creg, dreg, d, sav;
+
+       if (irq == PINT0_IRQ) {
+#if defined(CONFIG_CPU_SUBTYPE_SH7707)
+               creg = PORT_PACR;
+               dreg = PORT_PADR;
+#else
+               creg = PORT_PCCR;
+               dreg = PORT_PCDR;
+#endif
+               sav = ctrl_inw(creg);
+               ctrl_outw(sav | portcr_mask, creg);
+               d = (~ctrl_inb(dreg) ^ ctrl_inw(INTC_ICR2)) &
+                       ctrl_inw(INTC_INTER) & 0xff;
+               ctrl_outw(sav, creg);
+
+               if (d == 0)
+                       return irq;
+
+               return PINT_IRQ_BASE + pint_map[d];
+       } else if (irq == PINT8_IRQ) {
+#if defined(CONFIG_CPU_SUBTYPE_SH7707)
+               creg = PORT_PBCR;
+               dreg = PORT_PBDR;
+#else
+               creg = PORT_PFCR;
+               dreg = PORT_PFDR;
+#endif
+               sav = ctrl_inw(creg);
+               ctrl_outw(sav | (portcr_mask >> 16), creg);
+               d = (~ctrl_inb(dreg) ^ (ctrl_inw(INTC_ICR2) >> 8)) &
+                       (ctrl_inw(INTC_INTER) >> 8) & 0xff;
+               ctrl_outw(sav, creg);
+
+               if (d == 0)
+                       return irq;
+
+               return PINT_IRQ_BASE + 8 + pint_map[d];
+       }
+
+       return irq;
+}
+