[ARM] 3995/1: iop13xx: add iop13xx support

The iop348 processor integrates an Xscale (XSC3 512KB L2 Cache) core with a
Serial Attached SCSI (SAS) controller, multi-ported DDR2 memory
controller, 3 Application Direct Memory Access (DMA) controllers, a 133Mhz
PCI-X interface, a x8 PCI-Express interface, and other peripherals to form
a system-on-a-chip RAID subsystem engine.

The iop342 processor replaces the SAS controller with a second Xscale core
for dual core embedded applications.

The iop341 processor is the single core version of iop342.

This patch supports the two Intel customer reference platforms iq81340mc
for external storage and iq81340sc for direct attach (HBA) development.

The developer's manual is available here:
ftp://download.intel.com/design/iio/docs/31503701.pdf

Changelog:
* removed virtual addresses from resource definitions
* cleaned up some unnecessary #include's

Signed-off-by: Dan Williams <dan.j.williams@intel.com>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>

1 files changed, 286 insertions, 0 deletions

diff --git a/arch/arm/mach-iop13xx/irq.c b/arch/arm/mach-iop13xx/irq.c
new file mode 100644
index 000000000000..c4d9c8c5579c
--- /dev/null
+++ b/arch/arm/mach-iop13xx/irq.c
@@ -0,0 +1,286 @@
+/*
+ * iop13xx IRQ handling / support functions
+ * Copyright (c) 2005-2006, Intel Corporation.
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms and conditions of the GNU General Public License,
+ * version 2, as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope 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.
+ *
+ */
+#include <linux/init.h>
+#include <linux/interrupt.h>
+#include <linux/list.h>
+#include <linux/sysctl.h>
+#include <asm/uaccess.h>
+#include <asm/mach/irq.h>
+#include <asm/irq.h>
+#include <asm/hardware.h>
+#include <asm/mach-types.h>
+#include <asm/arch/irqs.h>
+
+/* INTCTL0 CP6 R0 Page 4
+ */
+static inline u32 read_intctl_0(void)
+{
+        u32 val;
+        asm volatile("mrc p6, 0, %0, c0, c4, 0":"=r" (val));
+        return val;
+}
+static inline void write_intctl_0(u32 val)
+{
+        asm volatile("mcr p6, 0, %0, c0, c4, 0"::"r" (val));
+}
+
+/* INTCTL1 CP6 R1 Page 4
+ */
+static inline u32 read_intctl_1(void)
+{
+        u32 val;
+        asm volatile("mrc p6, 0, %0, c1, c4, 0":"=r" (val));
+        return val;
+}
+static inline void write_intctl_1(u32 val)
+{
+        asm volatile("mcr p6, 0, %0, c1, c4, 0"::"r" (val));
+}
+
+/* INTCTL2 CP6 R2 Page 4
+ */
+static inline u32 read_intctl_2(void)
+{
+        u32 val;
+        asm volatile("mrc p6, 0, %0, c2, c4, 0":"=r" (val));
+        return val;
+}
+static inline void write_intctl_2(u32 val)
+{
+        asm volatile("mcr p6, 0, %0, c2, c4, 0"::"r" (val));
+}
+
+/* INTCTL3 CP6 R3 Page 4
+ */
+static inline u32 read_intctl_3(void)
+{
+        u32 val;
+        asm volatile("mrc p6, 0, %0, c3, c4, 0":"=r" (val));
+        return val;
+}
+static inline void write_intctl_3(u32 val)
+{
+        asm volatile("mcr p6, 0, %0, c3, c4, 0"::"r" (val));
+}
+
+/* INTSTR0 CP6 R0 Page 5
+ */
+static inline u32 read_intstr_0(void)
+{
+        u32 val;
+        asm volatile("mrc p6, 0, %0, c0, c5, 0":"=r" (val));
+        return val;
+}
+static inline void write_intstr_0(u32 val)
+{
+        asm volatile("mcr p6, 0, %0, c0, c5, 0"::"r" (val));
+}
+
+/* INTSTR1 CP6 R1 Page 5
+ */
+static inline u32 read_intstr_1(void)
+{
+        u32 val;
+        asm volatile("mrc p6, 0, %0, c1, c5, 0":"=r" (val));
+        return val;
+}
+static void write_intstr_1(u32 val)
+{
+        asm volatile("mcr p6, 0, %0, c1, c5, 0"::"r" (val));
+}
+
+/* INTSTR2 CP6 R2 Page 5
+ */
+static inline u32 read_intstr_2(void)
+{
+        u32 val;
+        asm volatile("mrc p6, 0, %0, c2, c5, 0":"=r" (val));
+        return val;
+}
+static void write_intstr_2(u32 val)
+{
+        asm volatile("mcr p6, 0, %0, c2, c5, 0"::"r" (val));
+}
+
+/* INTSTR3 CP6 R3 Page 5
+ */
+static inline u32 read_intstr_3(void)
+{
+        u32 val;
+        asm volatile("mrc p6, 0, %0, c3, c5, 0":"=r" (val));
+        return val;
+}
+static void write_intstr_3(u32 val)
+{
+        asm volatile("mcr p6, 0, %0, c3, c5, 0"::"r" (val));
+}
+
+/* INTBASE CP6 R0 Page 2
+ */
+static inline u32 read_intbase(void)
+{
+        u32 val;
+        asm volatile("mrc p6, 0, %0, c0, c2, 0":"=r" (val));
+        return val;
+}
+static void write_intbase(u32 val)
+{
+        asm volatile("mcr p6, 0, %0, c0, c2, 0"::"r" (val));
+}
+
+/* INTSIZE CP6 R2 Page 2
+ */
+static inline u32 read_intsize(void)
+{
+        u32 val;
+        asm volatile("mrc p6, 0, %0, c2, c2, 0":"=r" (val));
+        return val;
+}
+static void write_intsize(u32 val)
+{
+        asm volatile("mcr p6, 0, %0, c2, c2, 0"::"r" (val));
+}
+
+/* 0 = Interrupt Masked and 1 = Interrupt not masked */
+static void
+iop13xx_irq_mask0 (unsigned int irq)
+{
+        u32 cp_flags = iop13xx_cp6_save();
+        write_intctl_0(read_intctl_0() & ~(1 << (irq - 0)));
+        iop13xx_cp6_restore(cp_flags);
+}
+
+static void
+iop13xx_irq_mask1 (unsigned int irq)
+{
+        u32 cp_flags = iop13xx_cp6_save();
+        write_intctl_1(read_intctl_1() & ~(1 << (irq - 32)));
+        iop13xx_cp6_restore(cp_flags);
+}
+
+static void
+iop13xx_irq_mask2 (unsigned int irq)
+{
+        u32 cp_flags = iop13xx_cp6_save();
+        write_intctl_2(read_intctl_2() & ~(1 << (irq - 64)));
+        iop13xx_cp6_restore(cp_flags);
+}
+
+static void
+iop13xx_irq_mask3 (unsigned int irq)
+{
+        u32 cp_flags = iop13xx_cp6_save();
+        write_intctl_3(read_intctl_3() & ~(1 << (irq - 96)));
+        iop13xx_cp6_restore(cp_flags);
+}
+
+static void
+iop13xx_irq_unmask0(unsigned int irq)
+{
+        u32 cp_flags = iop13xx_cp6_save();
+        write_intctl_0(read_intctl_0() | (1 << (irq - 0)));
+        iop13xx_cp6_restore(cp_flags);
+}
+
+static void
+iop13xx_irq_unmask1(unsigned int irq)
+{
+        u32 cp_flags = iop13xx_cp6_save();
+        write_intctl_1(read_intctl_1() | (1 << (irq - 32)));
+        iop13xx_cp6_restore(cp_flags);
+}
+
+static void
+iop13xx_irq_unmask2(unsigned int irq)
+{
+        u32 cp_flags = iop13xx_cp6_save();
+        write_intctl_2(read_intctl_2() | (1 << (irq - 64)));
+        iop13xx_cp6_restore(cp_flags);
+}
+
+static void
+iop13xx_irq_unmask3(unsigned int irq)
+{
+        u32 cp_flags = iop13xx_cp6_save();
+        write_intctl_3(read_intctl_3() | (1 << (irq - 96)));
+        iop13xx_cp6_restore(cp_flags);
+}
+
+static struct irqchip iop13xx_irqchip0 = {
+        .ack    = iop13xx_irq_mask0,
+        .mask   = iop13xx_irq_mask0,
+        .unmask = iop13xx_irq_unmask0,
+};
+
+static struct irqchip iop13xx_irqchip1 = {
+        .ack    = iop13xx_irq_mask1,
+        .mask   = iop13xx_irq_mask1,
+        .unmask = iop13xx_irq_unmask1,
+};
+
+static struct irqchip iop13xx_irqchip2 = {
+        .ack    = iop13xx_irq_mask2,
+        .mask   = iop13xx_irq_mask2,
+        .unmask = iop13xx_irq_unmask2,
+};
+
+static struct irqchip iop13xx_irqchip3 = {
+        .ack    = iop13xx_irq_mask3,
+        .mask   = iop13xx_irq_mask3,
+        .unmask = iop13xx_irq_unmask3,
+};
+
+void __init iop13xx_init_irq(void)
+{
+        unsigned int i;
+
+        u32 cp_flags = iop13xx_cp6_save();
+
+        /* disable all interrupts */
+        write_intctl_0(0);
+        write_intctl_1(0);
+        write_intctl_2(0);
+        write_intctl_3(0);
+
+        /* treat all as IRQ */
+        write_intstr_0(0);
+        write_intstr_1(0);
+        write_intstr_2(0);
+        write_intstr_3(0);
+
+        /* initialize the interrupt vector generator */
+        write_intbase(INTBASE);
+        write_intsize(INTSIZE_4);
+
+        for(i = 0; i < NR_IOP13XX_IRQS; i++) {
+                if (i < 32)
+                        set_irq_chip(i, &iop13xx_irqchip0);
+                else if (i < 64)
+                        set_irq_chip(i, &iop13xx_irqchip1);
+                else if (i < 96)
+                        set_irq_chip(i, &iop13xx_irqchip2);
+                else
+                        set_irq_chip(i, &iop13xx_irqchip3);
+
+                set_irq_handler(i, do_level_IRQ);
+                set_irq_flags(i, IRQF_VALID | IRQF_PROBE);
+        }
+
+        iop13xx_cp6_restore(cp_flags);
+}