1 files changed, 205 insertions, 0 deletions

diff --git a/arch/arm/mach-footbridge/common.c b/arch/arm/mach-footbridge/common.c
new file mode 100644
index 000000000000..eb8238c1ef06
--- /dev/null
+++ b/arch/arm/mach-footbridge/common.c
@@ -0,0 +1,205 @@
+/*
+ *  linux/arch/arm/mach-footbridge/common.c
+ *
+ *  Copyright (C) 1998-2000 Russell King, Dave Gilbert.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+#include <linux/config.h>
+#include <linux/module.h>
+#include <linux/types.h>
+#include <linux/mm.h>
+#include <linux/ioport.h>
+#include <linux/list.h>
+#include <linux/init.h>
+ 
+#include <asm/pgtable.h>
+#include <asm/page.h>
+#include <asm/irq.h>
+#include <asm/io.h>
+#include <asm/mach-types.h>
+#include <asm/setup.h>
+#include <asm/hardware/dec21285.h>
+
+#include <asm/mach/irq.h>
+#include <asm/mach/map.h>
+
+#include "common.h"
+
+extern void __init isa_init_irq(unsigned int irq);
+
+unsigned int mem_fclk_21285 = 50000000;
+
+EXPORT_SYMBOL(mem_fclk_21285);
+
+static int __init parse_tag_memclk(const struct tag *tag)
+{
+        mem_fclk_21285 = tag->u.memclk.fmemclk;
+        return 0;
+}
+
+__tagtable(ATAG_MEMCLK, parse_tag_memclk);
+
+/*
+ * Footbridge IRQ translation table
+ *  Converts from our IRQ numbers into FootBridge masks
+ */
+static const int fb_irq_mask[] = {
+        IRQ_MASK_UART_RX,       /*  0 */
+        IRQ_MASK_UART_TX,       /*  1 */
+        IRQ_MASK_TIMER1,        /*  2 */
+        IRQ_MASK_TIMER2,        /*  3 */
+        IRQ_MASK_TIMER3,        /*  4 */
+        IRQ_MASK_IN0,           /*  5 */
+        IRQ_MASK_IN1,           /*  6 */
+        IRQ_MASK_IN2,           /*  7 */
+        IRQ_MASK_IN3,           /*  8 */
+        IRQ_MASK_DOORBELLHOST,  /*  9 */
+        IRQ_MASK_DMA1,          /* 10 */
+        IRQ_MASK_DMA2,          /* 11 */
+        IRQ_MASK_PCI,           /* 12 */
+        IRQ_MASK_SDRAMPARITY,   /* 13 */
+        IRQ_MASK_I2OINPOST,     /* 14 */
+        IRQ_MASK_PCI_ABORT,     /* 15 */
+        IRQ_MASK_PCI_SERR,      /* 16 */
+        IRQ_MASK_DISCARD_TIMER, /* 17 */
+        IRQ_MASK_PCI_DPERR,     /* 18 */
+        IRQ_MASK_PCI_PERR,      /* 19 */
+};
+
+static void fb_mask_irq(unsigned int irq)
+{
+        *CSR_IRQ_DISABLE = fb_irq_mask[_DC21285_INR(irq)];
+}
+
+static void fb_unmask_irq(unsigned int irq)
+{
+        *CSR_IRQ_ENABLE = fb_irq_mask[_DC21285_INR(irq)];
+}
+
+static struct irqchip fb_chip = {
+        .ack    = fb_mask_irq,
+        .mask   = fb_mask_irq,
+        .unmask = fb_unmask_irq,
+};
+
+static void __init __fb_init_irq(void)
+{
+        unsigned int irq;
+
+        /*
+         * setup DC21285 IRQs
+         */
+        *CSR_IRQ_DISABLE = -1;
+        *CSR_FIQ_DISABLE = -1;
+
+        for (irq = _DC21285_IRQ(0); irq < _DC21285_IRQ(20); irq++) {
+                set_irq_chip(irq, &fb_chip);
+                set_irq_handler(irq, do_level_IRQ);
+                set_irq_flags(irq, IRQF_VALID | IRQF_PROBE);
+        }
+}
+
+void __init footbridge_init_irq(void)
+{
+        __fb_init_irq();
+
+        if (!footbridge_cfn_mode())
+                return;
+
+        if (machine_is_ebsa285())
+                /* The following is dependent on which slot
+                 * you plug the Southbridge card into.  We
+                 * currently assume that you plug it into
+                 * the right-hand most slot.
+                 */
+                isa_init_irq(IRQ_PCI);
+
+        if (machine_is_cats())
+                isa_init_irq(IRQ_IN2);
+
+        if (machine_is_netwinder())
+                isa_init_irq(IRQ_IN3);
+}
+
+/*
+ * Common mapping for all systems.  Note that the outbound write flush is
+ * commented out since there is a "No Fix" problem with it.  Not mapping
+ * it means that we have extra bullet protection on our feet.
+ */
+static struct map_desc fb_common_io_desc[] __initdata = {
+ { ARMCSR_BASE,  DC21285_ARMCSR_BASE,       ARMCSR_SIZE,  MT_DEVICE },
+ { XBUS_BASE,    0x40000000,                XBUS_SIZE,    MT_DEVICE }
+};
+
+/*
+ * The mapping when the footbridge is in host mode.  We don't map any of
+ * this when we are in add-in mode.
+ */
+static struct map_desc ebsa285_host_io_desc[] __initdata = {
+#if defined(CONFIG_ARCH_FOOTBRIDGE) && defined(CONFIG_FOOTBRIDGE_HOST)
+ { PCIMEM_BASE,  DC21285_PCI_MEM,           PCIMEM_SIZE,  MT_DEVICE },
+ { PCICFG0_BASE, DC21285_PCI_TYPE_0_CONFIG, PCICFG0_SIZE, MT_DEVICE },
+ { PCICFG1_BASE, DC21285_PCI_TYPE_1_CONFIG, PCICFG1_SIZE, MT_DEVICE },
+ { PCIIACK_BASE, DC21285_PCI_IACK,          PCIIACK_SIZE, MT_DEVICE },
+ { PCIO_BASE,    DC21285_PCI_IO,            PCIO_SIZE,    MT_DEVICE }
+#endif
+};
+
+/*
+ * The CO-ebsa285 mapping.
+ */
+static struct map_desc co285_io_desc[] __initdata = {
+#ifdef CONFIG_ARCH_CO285
+ { PCIO_BASE,    DC21285_PCI_IO,            PCIO_SIZE,    MT_DEVICE },
+ { PCIMEM_BASE,  DC21285_PCI_MEM,           PCIMEM_SIZE,  MT_DEVICE }
+#endif
+};
+
+void __init footbridge_map_io(void)
+{
+        /*
+         * Set up the common mapping first; we need this to
+         * determine whether we're in host mode or not.
+         */
+        iotable_init(fb_common_io_desc, ARRAY_SIZE(fb_common_io_desc));
+
+        /*
+         * Now, work out what we've got to map in addition on this
+         * platform.
+         */
+        if (machine_is_co285())
+                iotable_init(co285_io_desc, ARRAY_SIZE(co285_io_desc));
+        if (footbridge_cfn_mode())
+                iotable_init(ebsa285_host_io_desc, ARRAY_SIZE(ebsa285_host_io_desc));
+}
+
+#ifdef CONFIG_FOOTBRIDGE_ADDIN
+
+/*
+ * These two functions convert virtual addresses to PCI addresses and PCI
+ * addresses to virtual addresses.  Note that it is only legal to use these
+ * on memory obtained via get_zeroed_page or kmalloc.
+ */
+unsigned long __virt_to_bus(unsigned long res)
+{
+        WARN_ON(res < PAGE_OFFSET || res >= (unsigned long)high_memory);
+
+        return (res - PAGE_OFFSET) + (*CSR_PCISDRAMBASE & 0xfffffff0);
+}
+EXPORT_SYMBOL(__virt_to_bus);
+
+unsigned long __bus_to_virt(unsigned long res)
+{
+        res -= (*CSR_PCISDRAMBASE & 0xfffffff0);
+        res += PAGE_OFFSET;
+
+        WARN_ON(res < PAGE_OFFSET || res >= (unsigned long)high_memory);
+
+        return res;
+}
+EXPORT_SYMBOL(__bus_to_virt);
+
+#endif