2 * PPC476 board specific routines
4 * Copyright 2010 Torez Smith, IBM Corporation.
6 * Based on earlier code:
7 * Matt Porter <mporter@kernel.crashing.org>
8 * Copyright 2002-2005 MontaVista Software Inc.
10 * Eugene Surovegin <eugene.surovegin@zultys.com> or <ebs@ebshome.net>
11 * Copyright (c) 2003-2005 Zultys Technologies
13 * Rewritten and ported to the merged powerpc tree:
14 * Copyright 2007 David Gibson <dwg@au1.ibm.com>, IBM Corporation.
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.
22 #include <linux/init.h>
23 #include <linux/of_platform.h>
24 #include <linux/rtc.h>
26 #include <asm/machdep.h>
31 #include <asm/ppc4xx.h>
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", },
43 static int __init
iss4xx_device_probe(void)
45 of_platform_bus_probe(NULL
, iss4xx_of_bus
, NULL
);
50 machine_device_initcall(iss4xx
, iss4xx_device_probe
);
52 /* We can have either UICs or MPICs */
53 static void __init
iss4xx_init_irq(void)
55 struct device_node
*np
;
57 /* Find top level interrupt controller */
58 for_each_node_with_property(np
, "interrupt-controller") {
59 if (of_get_property(np
, "interrupts", NULL
) == NULL
)
63 panic("Can't find top level interrupt controller");
65 /* Check type and do appropriate initialization */
66 if (of_device_is_compatible(np
, "ibm,uic")) {
68 ppc_md
.get_irq
= uic_get_irq
;
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
74 struct mpic
*mpic
= mpic_alloc(np
, 0, MPIC_NO_RESET
, 0, 0, " MPIC ");
77 ppc_md
.get_irq
= mpic_get_irq
;
80 panic("Unrecognized top level interrupt controller");
84 static void __cpuinit
smp_iss4xx_setup_cpu(int cpu
)
86 mpic_setup_this_cpu();
89 static int __cpuinit
smp_iss4xx_kick_cpu(int cpu
)
91 struct device_node
*cpunode
= of_get_cpu_node(cpu
, NULL
);
92 const u64
*spin_table_addr_prop
;
94 extern void start_secondary_47x(void);
96 BUG_ON(cpunode
== NULL
);
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
102 spin_table_addr_prop
= of_get_property(cpunode
, "cpu-release-addr",
104 if (spin_table_addr_prop
== NULL
) {
105 pr_err("CPU%d: Can't start, missing cpu-release-addr !\n", cpu
);
109 /* Assume it's mapped as part of the linear mapping. This is a bit
110 * fishy but will work fine for now
112 spin_table
= (u32
*)__va(*spin_table_addr_prop
);
113 pr_debug("CPU%d: Spin table mapped at %p\n", cpu
, spin_table
);
117 spin_table
[1] = __pa(start_secondary_47x
);
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
,
132 static void __init
iss4xx_smp_init(void)
134 if (mmu_has_feature(MMU_FTR_TYPE_47x
))
135 smp_ops
= &iss_smp_ops
;
138 #else /* CONFIG_SMP */
139 static void __init
iss4xx_smp_init(void) { }
140 #endif /* CONFIG_SMP */
142 static void __init
iss4xx_setup_arch(void)
148 * Called very early, MMU is off, device-tree isn't unflattened
150 static int __init
iss4xx_probe(void)
152 unsigned long root
= of_get_flat_dt_root();
154 if (!of_flat_dt_is_compatible(root
, "ibm,iss-4xx"))
160 define_machine(iss4xx
) {
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
,