linux/arch/powerpc/platforms/44x/currituck.c
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   1/*
   2 * Currituck board specific routines
   3 *
   4 * Copyright \xC2\xA9 2011 Tony Breeds IBM Corporation
   5 *
   6 * Based on earlier code:
   7 *    Matt Porter <mporter@kernel.crashing.org>
   8 *    Copyright 2002-2005 MontaVista Software Inc.
   9 *
  10 *    Eugene Surovegin <eugene.surovegin@zultys.com> or <ebs@ebshome.net>
  11 *    Copyright (c) 2003-2005 Zultys Technologies
  12 *
  13 *    Rewritten and ported to the merged powerpc tree:
  14 *    Copyright 2007 David Gibson <dwg@au1.ibm.com>, IBM Corporation.
  15 *    Copyright \xC2\xA9 2011 David Kliekamp IBM Corporation
  16 *
  17 * This program is free software; you can redistribute  it and/or modify it
  18 * under  the terms of  the GNU General  Public License as published by the
  19 * Free Software Foundation;  either version 2 of the  License, or (at your
  20 * option) any later version.
  21 */
  22
  23#include <linux/init.h>
  24#include <linux/memblock.h>
  25#include <linux/of.h>
  26#include <linux/of_platform.h>
  27#include <linux/rtc.h>
  28
  29#include <asm/machdep.h>
  30#include <asm/prom.h>
  31#include <asm/udbg.h>
  32#include <asm/time.h>
  33#include <asm/uic.h>
  34#include <asm/ppc4xx.h>
  35#include <asm/mpic.h>
  36#include <asm/mmu.h>
  37
  38#include <linux/pci.h>
  39
  40static __initdata struct of_device_id ppc47x_of_bus[] = {
  41        { .compatible = "ibm,plb4", },
  42        { .compatible = "ibm,plb6", },
  43        { .compatible = "ibm,opb", },
  44        { .compatible = "ibm,ebc", },
  45        {},
  46};
  47
  48/* The EEPROM is missing and the default values are bogus.  This forces USB in
  49 * to EHCI mode */
  50static void __devinit quirk_ppc_currituck_usb_fixup(struct pci_dev *dev)
  51{
  52        if (of_machine_is_compatible("ibm,currituck")) {
  53                pci_write_config_dword(dev, 0xe0, 0x0114231f);
  54                pci_write_config_dword(dev, 0xe4, 0x00006c40);
  55        }
  56}
  57DECLARE_PCI_FIXUP_HEADER(0x1033, 0x0035, quirk_ppc_currituck_usb_fixup);
  58
  59static int __init ppc47x_device_probe(void)
  60{
  61        of_platform_bus_probe(NULL, ppc47x_of_bus, NULL);
  62
  63        return 0;
  64}
  65machine_device_initcall(ppc47x, ppc47x_device_probe);
  66
  67/* We can have either UICs or MPICs */
  68static void __init ppc47x_init_irq(void)
  69{
  70        struct device_node *np;
  71
  72        /* Find top level interrupt controller */
  73        for_each_node_with_property(np, "interrupt-controller") {
  74                if (of_get_property(np, "interrupts", NULL) == NULL)
  75                        break;
  76        }
  77        if (np == NULL)
  78                panic("Can't find top level interrupt controller");
  79
  80        /* Check type and do appropriate initialization */
  81        if (of_device_is_compatible(np, "chrp,open-pic")) {
  82                /* The MPIC driver will get everything it needs from the
  83                 * device-tree, just pass 0 to all arguments
  84                 */
  85                struct mpic *mpic =
  86                        mpic_alloc(np, 0, 0, 0, 0, " MPIC     ");
  87                BUG_ON(mpic == NULL);
  88                mpic_init(mpic);
  89                ppc_md.get_irq = mpic_get_irq;
  90        } else
  91                panic("Unrecognized top level interrupt controller");
  92}
  93
  94#ifdef CONFIG_SMP
  95static void __cpuinit smp_ppc47x_setup_cpu(int cpu)
  96{
  97        mpic_setup_this_cpu();
  98}
  99
 100static int __cpuinit smp_ppc47x_kick_cpu(int cpu)
 101{
 102        struct device_node *cpunode = of_get_cpu_node(cpu, NULL);
 103        const u64 *spin_table_addr_prop;
 104        u32 *spin_table;
 105        extern void start_secondary_47x(void);
 106
 107        BUG_ON(cpunode == NULL);
 108
 109        /* Assume spin table. We could test for the enable-method in
 110         * the device-tree but currently there's little point as it's
 111         * our only supported method
 112         */
 113        spin_table_addr_prop =
 114                of_get_property(cpunode, "cpu-release-addr", NULL);
 115
 116        if (spin_table_addr_prop == NULL) {
 117                pr_err("CPU%d: Can't start, missing cpu-release-addr !\n",
 118                       cpu);
 119                return 1;
 120        }
 121
 122        /* Assume it's mapped as part of the linear mapping. This is a bit
 123         * fishy but will work fine for now
 124         *
 125         * XXX: Is there any reason to assume differently?
 126         */
 127        spin_table = (u32 *)__va(*spin_table_addr_prop);
 128        pr_debug("CPU%d: Spin table mapped at %p\n", cpu, spin_table);
 129
 130        spin_table[3] = cpu;
 131        smp_wmb();
 132        spin_table[1] = __pa(start_secondary_47x);
 133        mb();
 134
 135        return 0;
 136}
 137
 138static struct smp_ops_t ppc47x_smp_ops = {
 139        .probe          = smp_mpic_probe,
 140        .message_pass   = smp_mpic_message_pass,
 141        .setup_cpu      = smp_ppc47x_setup_cpu,
 142        .kick_cpu       = smp_ppc47x_kick_cpu,
 143        .give_timebase  = smp_generic_give_timebase,
 144        .take_timebase  = smp_generic_take_timebase,
 145};
 146
 147static void __init ppc47x_smp_init(void)
 148{
 149        if (mmu_has_feature(MMU_FTR_TYPE_47x))
 150                smp_ops = &ppc47x_smp_ops;
 151}
 152
 153#else /* CONFIG_SMP */
 154static void __init ppc47x_smp_init(void) { }
 155#endif /* CONFIG_SMP */
 156
 157static void __init ppc47x_setup_arch(void)
 158{
 159
 160        /* No need to check the DMA config as we /know/ our windows are all of
 161         * RAM.  Lets hope that doesn't change */
 162#ifdef CONFIG_SWIOTLB
 163        if (memblock_end_of_DRAM() > 0xffffffff) {
 164                ppc_swiotlb_enable = 1;
 165                set_pci_dma_ops(&swiotlb_dma_ops);
 166                ppc_md.pci_dma_dev_setup = pci_dma_dev_setup_swiotlb;
 167        }
 168#endif
 169        ppc47x_smp_init();
 170}
 171
 172/*
 173 * Called very early, MMU is off, device-tree isn't unflattened
 174 */
 175static int __init ppc47x_probe(void)
 176{
 177        unsigned long root = of_get_flat_dt_root();
 178
 179        if (!of_flat_dt_is_compatible(root, "ibm,currituck"))
 180                return 0;
 181
 182        return 1;
 183}
 184
 185/* Use USB controller should have been hardware swizzled but it wasn't :( */
 186static void ppc47x_pci_irq_fixup(struct pci_dev *dev)
 187{
 188        if (dev->vendor == 0x1033 && (dev->device == 0x0035 ||
 189                                      dev->device == 0x00e0)) {
 190                dev->irq = irq_create_mapping(NULL, 47);
 191                pr_info("%s: Mapping irq 47 %d\n", __func__, dev->irq);
 192        }
 193}
 194
 195define_machine(ppc47x) {
 196        .name                   = "PowerPC 47x",
 197        .probe                  = ppc47x_probe,
 198        .progress               = udbg_progress,
 199        .init_IRQ               = ppc47x_init_irq,
 200        .setup_arch             = ppc47x_setup_arch,
 201        .pci_irq_fixup          = ppc47x_pci_irq_fixup,
 202        .restart                = ppc4xx_reset_system,
 203        .calibrate_decr         = generic_calibrate_decr,
 204};
 205