linux/arch/powerpc/platforms/40x/ep405.c
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   1/*
   2 * Architecture- / platform-specific boot-time initialization code for
   3 * IBM PowerPC 4xx based boards. Adapted from original
   4 * code by Gary Thomas, Cort Dougan <cort@fsmlabs.com>, and Dan Malek
   5 * <dan@net4x.com>.
   6 *
   7 * Copyright(c) 1999-2000 Grant Erickson <grant@lcse.umn.edu>
   8 *
   9 * Rewritten and ported to the merged powerpc tree:
  10 * Copyright 2007 IBM Corporation
  11 * Josh Boyer <jwboyer@linux.vnet.ibm.com>
  12 *
  13 * Adapted to EP405 by Ben. Herrenschmidt <benh@kernel.crashing.org>
  14 *
  15 * TODO: Wire up the PCI IRQ mux and the southbridge interrupts
  16 *
  17 * 2002 (c) MontaVista, Software, Inc.  This file is licensed under
  18 * the terms of the GNU General Public License version 2.  This program
  19 * is licensed "as is" without any warranty of any kind, whether express
  20 * or implied.
  21 */
  22
  23#include <linux/init.h>
  24#include <linux/of_platform.h>
  25
  26#include <asm/machdep.h>
  27#include <asm/prom.h>
  28#include <asm/udbg.h>
  29#include <asm/time.h>
  30#include <asm/uic.h>
  31#include <asm/pci-bridge.h>
  32#include <asm/ppc4xx.h>
  33
  34static struct device_node *bcsr_node;
  35static void __iomem *bcsr_regs;
  36
  37/* BCSR registers  */
  38#define BCSR_ID                 0
  39#define BCSR_PCI_CTRL           1
  40#define BCSR_FLASH_NV_POR_CTRL  2
  41#define BCSR_FENET_UART_CTRL    3
  42#define BCSR_PCI_IRQ            4
  43#define BCSR_XIRQ_SELECT        5
  44#define BCSR_XIRQ_ROUTING       6
  45#define BCSR_XIRQ_STATUS        7
  46#define BCSR_XIRQ_STATUS2       8
  47#define BCSR_SW_STAT_LED_CTRL   9
  48#define BCSR_GPIO_IRQ_PAR_CTRL  10
  49/* there's more, can't be bothered typing them tho */
  50
  51
  52static __initdata struct of_device_id ep405_of_bus[] = {
  53        { .compatible = "ibm,plb3", },
  54        { .compatible = "ibm,opb", },
  55        { .compatible = "ibm,ebc", },
  56        {},
  57};
  58
  59static int __init ep405_device_probe(void)
  60{
  61        of_platform_bus_probe(NULL, ep405_of_bus, NULL);
  62
  63        return 0;
  64}
  65machine_device_initcall(ep405, ep405_device_probe);
  66
  67static void __init ep405_init_bcsr(void)
  68{
  69        const u8 *irq_routing;
  70        int i;
  71
  72        /* Find the bloody thing & map it */
  73        bcsr_node = of_find_compatible_node(NULL, NULL, "ep405-bcsr");
  74        if (bcsr_node == NULL) {
  75                printk(KERN_ERR "EP405 BCSR not found !\n");
  76                return;
  77        }
  78        bcsr_regs = of_iomap(bcsr_node, 0);
  79        if (bcsr_regs == NULL) {
  80                printk(KERN_ERR "EP405 BCSR failed to map !\n");
  81                return;
  82        }
  83
  84        /* Get the irq-routing property and apply the routing to the CPLD */
  85        irq_routing = of_get_property(bcsr_node, "irq-routing", NULL);
  86        if (irq_routing == NULL)
  87                return;
  88        for (i = 0; i < 16; i++) {
  89                u8 irq = irq_routing[i];
  90                out_8(bcsr_regs + BCSR_XIRQ_SELECT, i);
  91                out_8(bcsr_regs + BCSR_XIRQ_ROUTING, irq);
  92        }
  93        in_8(bcsr_regs + BCSR_XIRQ_SELECT);
  94        mb();
  95        out_8(bcsr_regs + BCSR_GPIO_IRQ_PAR_CTRL, 0xfe);
  96}
  97
  98static void __init ep405_setup_arch(void)
  99{
 100        /* Find & init the BCSR CPLD */
 101        ep405_init_bcsr();
 102
 103        pci_set_flags(PCI_REASSIGN_ALL_RSRC);
 104}
 105
 106static int __init ep405_probe(void)
 107{
 108        unsigned long root = of_get_flat_dt_root();
 109
 110        if (!of_flat_dt_is_compatible(root, "ep405"))
 111                return 0;
 112
 113        return 1;
 114}
 115
 116define_machine(ep405) {
 117        .name                   = "EP405",
 118        .probe                  = ep405_probe,
 119        .setup_arch             = ep405_setup_arch,
 120        .progress               = udbg_progress,
 121        .init_IRQ               = uic_init_tree,
 122        .get_irq                = uic_get_irq,
 123        .restart                = ppc4xx_reset_system,
 124        .calibrate_decr         = generic_calibrate_decr,
 125};
 126