release/src-rt-6.x.4708/linux/linux-2.6.36/arch/powerpc/platforms/85xx/stx_gp3.c

   1 /*
   2  * Based on MPC8560 ADS and arch/ppc stx_gp3 ports
   3  *
   4  * Maintained by Kumar Gala (see MAINTAINERS for contact information)
   5  *
   6  * Copyright 2008 Freescale Semiconductor Inc.
   7  *
   8  * Dan Malek <dan@embeddededge.com>
   9  * Copyright 2004 Embedded Edge, LLC
  10  *
  11  * Copied from mpc8560_ads.c
  12  * Copyright 2002, 2003 Motorola Inc.
  13  *
  14  * Ported to 2.6, Matt Porter <mporter@kernel.crashing.org>
  15  * Copyright 2004-2005 MontaVista Software, Inc.
  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/stddef.h>
  24 #include <linux/kernel.h>
  25 #include <linux/pci.h>
  26 #include <linux/kdev_t.h>
  27 #include <linux/delay.h>
  28 #include <linux/seq_file.h>
  29 #include <linux/of_platform.h>
  30
  31 #include <asm/system.h>
  32 #include <asm/time.h>
  33 #include <asm/machdep.h>
  34 #include <asm/pci-bridge.h>
  35 #include <asm/mpic.h>
  36 #include <asm/prom.h>
  37 #include <mm/mmu_decl.h>
  38 #include <asm/udbg.h>
  39
  40 #include <sysdev/fsl_soc.h>
  41 #include <sysdev/fsl_pci.h>
  42
  43 #ifdef CONFIG_CPM2
  44 #include <asm/cpm2.h>
  45 #include <sysdev/cpm2_pic.h>
  46
  47 static void cpm2_cascade(unsigned int irq, struct irq_desc *desc)
  48 {
  49         int cascade_irq;
  50
  51         while ((cascade_irq = cpm2_get_irq()) >= 0)
  52                 generic_handle_irq(cascade_irq);
  53
  54         desc->chip->eoi(irq);
  55 }
  56 #endif /* CONFIG_CPM2 */
  57
  58 static void __init stx_gp3_pic_init(void)
  59 {
  60         struct mpic *mpic;
  61         struct resource r;
  62         struct device_node *np;
  63 #ifdef CONFIG_CPM2
  64         int irq;
  65 #endif
  66
  67         np = of_find_node_by_type(NULL, "open-pic");
  68         if (!np) {
  69                 printk(KERN_ERR "Could not find open-pic node\n");
  70                 return;
  71         }
  72
  73         if (of_address_to_resource(np, 0, &r)) {
  74                 printk(KERN_ERR "Could not map mpic register space\n");
  75                 of_node_put(np);
  76                 return;
  77         }
  78
  79         mpic = mpic_alloc(np, r.start,
  80                         MPIC_PRIMARY | MPIC_WANTS_RESET | MPIC_BIG_ENDIAN,
  81                         0, 256, " OpenPIC  ");
  82         BUG_ON(mpic == NULL);
  83         of_node_put(np);
  84
  85         mpic_init(mpic);
  86
  87 #ifdef CONFIG_CPM2
  88         /* Setup CPM2 PIC */
  89         np = of_find_compatible_node(NULL, NULL, "fsl,cpm2-pic");
  90         if (np == NULL) {
  91                 printk(KERN_ERR "PIC init: can not find fsl,cpm2-pic node\n");
  92                 return;
  93         }
  94         irq = irq_of_parse_and_map(np, 0);
  95
  96         if (irq == NO_IRQ) {
  97                 of_node_put(np);
  98                 printk(KERN_ERR "PIC init: got no IRQ for cpm cascade\n");
  99                 return;
 100         }
 101
 102         cpm2_pic_init(np);
 103         of_node_put(np);
 104         set_irq_chained_handler(irq, cpm2_cascade);
 105 #endif
 106 }
 107
 108 /*
 109  * Setup the architecture
 110  */
 111 static void __init stx_gp3_setup_arch(void)
 112 {
 113 #ifdef CONFIG_PCI
 114         struct device_node *np;
 115 #endif
 116
 117         if (ppc_md.progress)
 118                 ppc_md.progress("stx_gp3_setup_arch()", 0);
 119
 120 #ifdef CONFIG_CPM2
 121         cpm2_reset();
 122 #endif
 123
 124 #ifdef CONFIG_PCI
 125         for_each_compatible_node(np, "pci", "fsl,mpc8540-pci")
 126                 fsl_add_bridge(np, 1);
 127 #endif
 128 }
 129
 130 static void stx_gp3_show_cpuinfo(struct seq_file *m)
 131 {
 132         uint pvid, svid, phid1;
 133
 134         pvid = mfspr(SPRN_PVR);
 135         svid = mfspr(SPRN_SVR);
 136
 137         seq_printf(m, "Vendor\t\t: RPC Electronics STx\n");
 138         seq_printf(m, "PVR\t\t: 0x%x\n", pvid);
 139         seq_printf(m, "SVR\t\t: 0x%x\n", svid);
 140
 141         /* Display cpu Pll setting */
 142         phid1 = mfspr(SPRN_HID1);
 143         seq_printf(m, "PLL setting\t: 0x%x\n", ((phid1 >> 24) & 0x3f));
 144 }
 145
 146 static struct of_device_id __initdata of_bus_ids[] = {
 147         { .compatible = "simple-bus", },
 148         { .compatible = "gianfar", },
 149         {},
 150 };
 151
 152 static int __init declare_of_platform_devices(void)
 153 {
 154         of_platform_bus_probe(NULL, of_bus_ids, NULL);
 155
 156         return 0;
 157 }
 158 machine_device_initcall(stx_gp3, declare_of_platform_devices);
 159
 160 /*
 161  * Called very early, device-tree isn't unflattened
 162  */
 163 static int __init stx_gp3_probe(void)
 164 {
 165         unsigned long root = of_get_flat_dt_root();
 166
 167         return of_flat_dt_is_compatible(root, "stx,gp3-8560");
 168 }
 169
 170 define_machine(stx_gp3) {
 171         .name                   = "STX GP3",
 172         .probe                  = stx_gp3_probe,
 173         .setup_arch             = stx_gp3_setup_arch,
 174         .init_IRQ               = stx_gp3_pic_init,
 175         .show_cpuinfo           = stx_gp3_show_cpuinfo,
 176         .get_irq                = mpic_get_irq,
 177         .restart                = fsl_rstcr_restart,
 178         .calibrate_decr         = generic_calibrate_decr,
 179         .progress               = udbg_progress,
 180 };