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Linux/arch/powerpc/platforms/44x/iss4xx.c

  1 /*
  2  * PPC476 board specific routines
  3  *
  4  * Copyright 2010 Torez Smith, 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  *
 16  * This program is free software; you can redistribute  it and/or modify it
 17  * under  the terms of  the GNU General  Public License as published by the
 18  * Free Software Foundation;  either version 2 of the  License, or (at your
 19  * option) any later version.
 20  */
 21 
 22 #include <linux/init.h>
 23 #include <linux/of_platform.h>
 24 #include <linux/rtc.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/ppc4xx.h>
 32 #include <asm/mpic.h>
 33 #include <asm/mmu.h>
 34 
 35 static __initdata struct of_device_id iss4xx_of_bus[] = {
 36         { .compatible = "ibm,plb4", },
 37         { .compatible = "ibm,plb6", },
 38         { .compatible = "ibm,opb", },
 39         { .compatible = "ibm,ebc", },
 40         {},
 41 };
 42 
 43 static int __init iss4xx_device_probe(void)
 44 {
 45         of_platform_bus_probe(NULL, iss4xx_of_bus, NULL);
 46         of_instantiate_rtc();
 47 
 48         return 0;
 49 }
 50 machine_device_initcall(iss4xx, iss4xx_device_probe);
 51 
 52 /* We can have either UICs or MPICs */
 53 static void __init iss4xx_init_irq(void)
 54 {
 55         struct device_node *np;
 56 
 57         /* Find top level interrupt controller */
 58         for_each_node_with_property(np, "interrupt-controller") {
 59                 if (of_get_property(np, "interrupts", NULL) == NULL)
 60                         break;
 61         }
 62         if (np == NULL)
 63                 panic("Can't find top level interrupt controller");
 64 
 65         /* Check type and do appropriate initialization */
 66         if (of_device_is_compatible(np, "ibm,uic")) {
 67                 uic_init_tree();
 68                 ppc_md.get_irq = uic_get_irq;
 69 #ifdef CONFIG_MPIC
 70         } else if (of_device_is_compatible(np, "chrp,open-pic")) {
 71                 /* The MPIC driver will get everything it needs from the
 72                  * device-tree, just pass 0 to all arguments
 73                  */
 74                 struct mpic *mpic = mpic_alloc(np, 0, MPIC_NO_RESET, 0, 0, " MPIC     ");
 75                 BUG_ON(mpic == NULL);
 76                 mpic_init(mpic);
 77                 ppc_md.get_irq = mpic_get_irq;
 78 #endif
 79         } else
 80                 panic("Unrecognized top level interrupt controller");
 81 }
 82 
 83 #ifdef CONFIG_SMP
 84 static void smp_iss4xx_setup_cpu(int cpu)
 85 {
 86         mpic_setup_this_cpu();
 87 }
 88 
 89 static int smp_iss4xx_kick_cpu(int cpu)
 90 {
 91         struct device_node *cpunode = of_get_cpu_node(cpu, NULL);
 92         const u64 *spin_table_addr_prop;
 93         u32 *spin_table;
 94         extern void start_secondary_47x(void);
 95 
 96         BUG_ON(cpunode == NULL);
 97 
 98         /* Assume spin table. We could test for the enable-method in
 99          * the device-tree but currently there's little point as it's
100          * our only supported method
101          */
102         spin_table_addr_prop = of_get_property(cpunode, "cpu-release-addr",
103                                                NULL);
104         if (spin_table_addr_prop == NULL) {
105                 pr_err("CPU%d: Can't start, missing cpu-release-addr !\n", cpu);
106                 return -ENOENT;
107         }
108 
109         /* Assume it's mapped as part of the linear mapping. This is a bit
110          * fishy but will work fine for now
111          */
112         spin_table = (u32 *)__va(*spin_table_addr_prop);
113         pr_debug("CPU%d: Spin table mapped at %p\n", cpu, spin_table);
114 
115         spin_table[3] = cpu;
116         smp_wmb();
117         spin_table[1] = __pa(start_secondary_47x);
118         mb();
119 
120         return 0;
121 }
122 
123 static struct smp_ops_t iss_smp_ops = {
124         .probe          = smp_mpic_probe,
125         .message_pass   = smp_mpic_message_pass,
126         .setup_cpu      = smp_iss4xx_setup_cpu,
127         .kick_cpu       = smp_iss4xx_kick_cpu,
128         .give_timebase  = smp_generic_give_timebase,
129         .take_timebase  = smp_generic_take_timebase,
130 };
131 
132 static void __init iss4xx_smp_init(void)
133 {
134         if (mmu_has_feature(MMU_FTR_TYPE_47x))
135                 smp_ops = &iss_smp_ops;
136 }
137 
138 #else /* CONFIG_SMP */
139 static void __init iss4xx_smp_init(void) { }
140 #endif /* CONFIG_SMP */
141 
142 static void __init iss4xx_setup_arch(void)
143 {
144         iss4xx_smp_init();
145 }
146 
147 /*
148  * Called very early, MMU is off, device-tree isn't unflattened
149  */
150 static int __init iss4xx_probe(void)
151 {
152         unsigned long root = of_get_flat_dt_root();
153 
154         if (!of_flat_dt_is_compatible(root, "ibm,iss-4xx"))
155                 return 0;
156 
157         return 1;
158 }
159 
160 define_machine(iss4xx) {
161         .name                   = "ISS-4xx",
162         .probe                  = iss4xx_probe,
163         .progress               = udbg_progress,
164         .init_IRQ               = iss4xx_init_irq,
165         .setup_arch             = iss4xx_setup_arch,
166         .restart                = ppc4xx_reset_system,
167         .calibrate_decr         = generic_calibrate_decr,
168 };
169 

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