arch/powerpc/platforms/44x/currituck.c

   1 /*
   2  * Currituck board specific routines
   3  *
   4  * Copyright © 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 © 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
  40 static __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 */
  50 static 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 }
  57 DECLARE_PCI_FIXUP_HEADER(0x1033, 0x0035, quirk_ppc_currituck_usb_fixup);
  58
  59 static int __init ppc47x_device_probe(void)
  60 {
  61         of_platform_bus_probe(NULL, ppc47x_of_bus, NULL);
  62
  63         return 0;
  64 }
  65 machine_device_initcall(ppc47x, ppc47x_device_probe);
  66
  67 /* We can have either UICs or MPICs */
  68 static 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, MPIC_NO_RESET, 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
  95 static void __cpuinit smp_ppc47x_setup_cpu(int cpu)
  96 {
  97         mpic_setup_this_cpu();
  98 }
  99
 100 static 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
 138 static 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
 147 static 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 */
 154 static void __init ppc47x_smp_init(void) { }
 155 #endif /* CONFIG_SMP */
 156
 157 static 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() - 1) > 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  */
 175 static 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 :( */
 186 static 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
 195 define_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 };