arch/powerpc/platforms/40x/ep405.c

   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
  33 static struct device_node *bcsr_node;
  34 static void __iomem *bcsr_regs;
  35
  36 /* BCSR registers  */
  37 #define BCSR_ID                 0
  38 #define BCSR_PCI_CTRL           1
  39 #define BCSR_FLASH_NV_POR_CTRL  2
  40 #define BCSR_FENET_UART_CTRL    3
  41 #define BCSR_PCI_IRQ            4
  42 #define BCSR_XIRQ_SELECT        5
  43 #define BCSR_XIRQ_ROUTING       6
  44 #define BCSR_XIRQ_STATUS        7
  45 #define BCSR_XIRQ_STATUS2       8
  46 #define BCSR_SW_STAT_LED_CTRL   9
  47 #define BCSR_GPIO_IRQ_PAR_CTRL  10
  48 /* there's more, can't be bothered typing them tho */
  49
  50
  51 static __initdata struct of_device_id ep405_of_bus[] = {
  52         { .compatible = "ibm,plb3", },
  53         { .compatible = "ibm,opb", },
  54         { .compatible = "ibm,ebc", },
  55         {},
  56 };
  57
  58 static int __init ep405_device_probe(void)
  59 {
  60         of_platform_bus_probe(NULL, ep405_of_bus, NULL);
  61
  62         return 0;
  63 }
  64 machine_device_initcall(ep405, ep405_device_probe);
  65
  66 static void __init ep405_init_bcsr(void)
  67 {
  68         const u8 *irq_routing;
  69         int i;
  70
  71         /* Find the bloody thing & map it */
  72         bcsr_node = of_find_compatible_node(NULL, NULL, "ep405-bcsr");
  73         if (bcsr_node == NULL) {
  74                 printk(KERN_ERR "EP405 BCSR not found !\n");
  75                 return;
  76         }
  77         bcsr_regs = of_iomap(bcsr_node, 0);
  78         if (bcsr_regs == NULL) {
  79                 printk(KERN_ERR "EP405 BCSR failed to map !\n");
  80                 return;
  81         }
  82
  83         /* Get the irq-routing property and apply the routing to the CPLD */
  84         irq_routing = of_get_property(bcsr_node, "irq-routing", NULL);
  85         if (irq_routing == NULL)
  86                 return;
  87         for (i = 0; i < 16; i++) {
  88                 u8 irq = irq_routing[i];
  89                 out_8(bcsr_regs + BCSR_XIRQ_SELECT, i);
  90                 out_8(bcsr_regs + BCSR_XIRQ_ROUTING, irq);
  91         }
  92         in_8(bcsr_regs + BCSR_XIRQ_SELECT);
  93         mb();
  94         out_8(bcsr_regs + BCSR_GPIO_IRQ_PAR_CTRL, 0xfe);
  95 }
  96
  97 static void __init ep405_setup_arch(void)
  98 {
  99         /* Find & init the BCSR CPLD */
 100         ep405_init_bcsr();
 101
 102         ppc_pci_flags = PPC_PCI_REASSIGN_ALL_RSRC;
 103 }
 104
 105 static int __init ep405_probe(void)
 106 {
 107         unsigned long root = of_get_flat_dt_root();
 108
 109         if (!of_flat_dt_is_compatible(root, "ep405"))
 110                 return 0;
 111
 112         return 1;
 113 }
 114
 115 define_machine(ep405) {
 116         .name                   = "EP405",
 117         .probe                  = ep405_probe,
 118         .setup_arch             = ep405_setup_arch,
 119         .progress               = udbg_progress,
 120         .init_IRQ               = uic_init_tree,
 121         .get_irq                = uic_get_irq,
 122         .calibrate_decr         = generic_calibrate_decr,
 123 };