powerpc/47x: Add support for the new IBM currituck platform

Based on original work by David 'Shaggy' Kleikamp.

Signed-off-by: Tony Breeds <tony@bakeyournoodle.com>
Signed-off-by: Josh Boyer <jwboyer@gmail.com>

1 files changed, 204 insertions, 0 deletions

diff --git a/arch/powerpc/platforms/44x/currituck.c b/arch/powerpc/platforms/44x/currituck.c
new file mode 100644
index 000000000000..1fdf56916873
--- /dev/null
+++ b/arch/powerpc/platforms/44x/currituck.c
@@ -0,0 +1,204 @@
+/*
+ * Currituck board specific routines
+ *
+ * Copyright © 2011 Tony Breeds IBM Corporation
+ *
+ * Based on earlier code:
+ *    Matt Porter <mporter@kernel.crashing.org>
+ *    Copyright 2002-2005 MontaVista Software Inc.
+ *
+ *    Eugene Surovegin <eugene.surovegin@zultys.com> or <ebs@ebshome.net>
+ *    Copyright (c) 2003-2005 Zultys Technologies
+ *
+ *    Rewritten and ported to the merged powerpc tree:
+ *    Copyright 2007 David Gibson <dwg@au1.ibm.com>, IBM Corporation.
+ *    Copyright © 2011 David Kliekamp IBM Corporation
+ *
+ * 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.
+ */
+
+#include <linux/init.h>
+#include <linux/memblock.h>
+#include <linux/of.h>
+#include <linux/of_platform.h>
+#include <linux/rtc.h>
+
+#include <asm/machdep.h>
+#include <asm/prom.h>
+#include <asm/udbg.h>
+#include <asm/time.h>
+#include <asm/uic.h>
+#include <asm/ppc4xx.h>
+#include <asm/mpic.h>
+#include <asm/mmu.h>
+
+#include <linux/pci.h>
+
+static __initdata struct of_device_id ppc47x_of_bus[] = {
+        { .compatible = "ibm,plb4", },
+        { .compatible = "ibm,plb6", },
+        { .compatible = "ibm,opb", },
+        { .compatible = "ibm,ebc", },
+        {},
+};
+
+/* The EEPROM is missing and the default values are bogus.  This forces USB in
+ * to EHCI mode */
+static void __devinit quirk_ppc_currituck_usb_fixup(struct pci_dev *dev)
+{
+        if (of_machine_is_compatible("ibm,currituck")) {
+                pci_write_config_dword(dev, 0xe0, 0x0114231f);
+                pci_write_config_dword(dev, 0xe4, 0x00006c40);
+        }
+}
+DECLARE_PCI_FIXUP_HEADER(0x1033, 0x0035, quirk_ppc_currituck_usb_fixup);
+
+static int __init ppc47x_device_probe(void)
+{
+        of_platform_bus_probe(NULL, ppc47x_of_bus, NULL);
+
+        return 0;
+}
+machine_device_initcall(ppc47x, ppc47x_device_probe);
+
+/* We can have either UICs or MPICs */
+static void __init ppc47x_init_irq(void)
+{
+        struct device_node *np;
+
+        /* Find top level interrupt controller */
+        for_each_node_with_property(np, "interrupt-controller") {
+                if (of_get_property(np, "interrupts", NULL) == NULL)
+                        break;
+        }
+        if (np == NULL)
+                panic("Can't find top level interrupt controller");
+
+        /* Check type and do appropriate initialization */
+        if (of_device_is_compatible(np, "chrp,open-pic")) {
+                /* The MPIC driver will get everything it needs from the
+                 * device-tree, just pass 0 to all arguments
+                 */
+                struct mpic *mpic =
+                        mpic_alloc(np, 0, MPIC_PRIMARY, 0, 0, " MPIC     ");
+                BUG_ON(mpic == NULL);
+                mpic_init(mpic);
+                ppc_md.get_irq = mpic_get_irq;
+        } else
+                panic("Unrecognized top level interrupt controller");
+}
+
+#ifdef CONFIG_SMP
+static void __cpuinit smp_ppc47x_setup_cpu(int cpu)
+{
+        mpic_setup_this_cpu();
+}
+
+static int __cpuinit smp_ppc47x_kick_cpu(int cpu)
+{
+        struct device_node *cpunode = of_get_cpu_node(cpu, NULL);
+        const u64 *spin_table_addr_prop;
+        u32 *spin_table;
+        extern void start_secondary_47x(void);
+
+        BUG_ON(cpunode == NULL);
+
+        /* Assume spin table. We could test for the enable-method in
+         * the device-tree but currently there's little point as it's
+         * our only supported method
+         */
+        spin_table_addr_prop =
+                of_get_property(cpunode, "cpu-release-addr", NULL);
+
+        if (spin_table_addr_prop == NULL) {
+                pr_err("CPU%d: Can't start, missing cpu-release-addr !\n",
+                       cpu);
+                return 1;
+        }
+
+        /* Assume it's mapped as part of the linear mapping. This is a bit
+         * fishy but will work fine for now
+         *
+         * XXX: Is there any reason to assume differently?
+         */
+        spin_table = (u32 *)__va(*spin_table_addr_prop);
+        pr_debug("CPU%d: Spin table mapped at %p\n", cpu, spin_table);
+
+        spin_table[3] = cpu;
+        smp_wmb();
+        spin_table[1] = __pa(start_secondary_47x);
+        mb();
+
+        return 0;
+}
+
+static struct smp_ops_t ppc47x_smp_ops = {
+        .probe          = smp_mpic_probe,
+        .message_pass   = smp_mpic_message_pass,
+        .setup_cpu      = smp_ppc47x_setup_cpu,
+        .kick_cpu       = smp_ppc47x_kick_cpu,
+        .give_timebase  = smp_generic_give_timebase,
+        .take_timebase  = smp_generic_take_timebase,
+};
+
+static void __init ppc47x_smp_init(void)
+{
+        if (mmu_has_feature(MMU_FTR_TYPE_47x))
+                smp_ops = &ppc47x_smp_ops;
+}
+
+#else /* CONFIG_SMP */
+static void __init ppc47x_smp_init(void) { }
+#endif /* CONFIG_SMP */
+
+static void __init ppc47x_setup_arch(void)
+{
+
+        /* No need to check the DMA config as we /know/ our windows are all of
+         * RAM.  Lets hope that doesn't change */
+#ifdef CONFIG_SWIOTLB
+        if (memblock_end_of_DRAM() > 0xffffffff) {
+                ppc_swiotlb_enable = 1;
+                set_pci_dma_ops(&swiotlb_dma_ops);
+                ppc_md.pci_dma_dev_setup = pci_dma_dev_setup_swiotlb;
+        }
+#endif
+        ppc47x_smp_init();
+}
+
+/*
+ * Called very early, MMU is off, device-tree isn't unflattened
+ */
+static int __init ppc47x_probe(void)
+{
+        unsigned long root = of_get_flat_dt_root();
+
+        if (!of_flat_dt_is_compatible(root, "ibm,currituck"))
+                return 0;
+
+        return 1;
+}
+
+/* Use USB controller should have been hardware swizzled but it wasn't :( */
+static void ppc47x_pci_irq_fixup(struct pci_dev *dev)
+{
+        if (dev->vendor == 0x1033 && (dev->device == 0x0035 ||
+                                      dev->device == 0x00e0)) {
+                dev->irq = irq_create_mapping(NULL, 47);
+                pr_info("%s: Mapping irq 47 %d\n", __func__, dev->irq);
+        }
+}
+
+define_machine(ppc47x) {
+        .name                   = "PowerPC 47x",
+        .probe                  = ppc47x_probe,
+        .progress               = udbg_progress,
+        .init_IRQ               = ppc47x_init_irq,
+        .setup_arch             = ppc47x_setup_arch,
+        .pci_irq_fixup          = ppc47x_pci_irq_fixup,
+        .restart                = ppc4xx_reset_system,
+        .calibrate_decr         = generic_calibrate_decr,
+};