1/*
2 * Currituck board specific routines
3 *
4 * Copyright © 2011 Tony Breeds 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 *    Copyright © 2011 David Kliekamp IBM Corporation
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/init.h>
24#include <linux/memblock.h>
25#include <linux/of.h>
26#include <linux/of_platform.h>
27#include <linux/rtc.h>
28
29#include <asm/machdep.h>
30#include <asm/prom.h>
31#include <asm/udbg.h>
32#include <asm/time.h>
33#include <asm/uic.h>
34#include <asm/ppc4xx.h>
35#include <asm/mpic.h>
36#include <asm/mmu.h>
37
38#include <linux/pci.h>
39
40static __initdata struct of_device_id ppc47x_of_bus[] = {
41	{ .compatible = "ibm,plb4", },
42	{ .compatible = "ibm,plb6", },
43	{ .compatible = "ibm,opb", },
44	{ .compatible = "ibm,ebc", },
45	{},
46};
47
48/* The EEPROM is missing and the default values are bogus.  This forces USB in
49 * to EHCI mode */
50static void __devinit quirk_ppc_currituck_usb_fixup(struct pci_dev *dev)
51{
52	if (of_machine_is_compatible("ibm,currituck")) {
53		pci_write_config_dword(dev, 0xe0, 0x0114231f);
54		pci_write_config_dword(dev, 0xe4, 0x00006c40);
55	}
56}
57DECLARE_PCI_FIXUP_HEADER(0x1033, 0x0035, quirk_ppc_currituck_usb_fixup);
58
59static int __init ppc47x_device_probe(void)
60{
61	of_platform_bus_probe(NULL, ppc47x_of_bus, NULL);
62
63	return 0;
64}
65machine_device_initcall(ppc47x, ppc47x_device_probe);
66
67/* We can have either UICs or MPICs */
68static void __init ppc47x_init_irq(void)
69{
70	struct device_node *np;
71
72	/* Find top level interrupt controller */
73	for_each_node_with_property(np, "interrupt-controller") {
74		if (of_get_property(np, "interrupts", NULL) == NULL)
75			break;
76	}
77	if (np == NULL)
78		panic("Can't find top level interrupt controller");
79
80	/* Check type and do appropriate initialization */
81	if (of_device_is_compatible(np, "chrp,open-pic")) {
82		/* The MPIC driver will get everything it needs from the
83		 * device-tree, just pass 0 to all arguments
84		 */
85		struct mpic *mpic =
86			mpic_alloc(np, 0, MPIC_NO_RESET, 0, 0, " MPIC     ");
87		BUG_ON(mpic == NULL);
88		mpic_init(mpic);
89		ppc_md.get_irq = mpic_get_irq;
90	} else
91		panic("Unrecognized top level interrupt controller");
92}
93
94#ifdef CONFIG_SMP
95static void __cpuinit smp_ppc47x_setup_cpu(int cpu)
96{
97	mpic_setup_this_cpu();
98}
99
100static int __cpuinit smp_ppc47x_kick_cpu(int cpu)
101{
102	struct device_node *cpunode = of_get_cpu_node(cpu, NULL);
103	const u64 *spin_table_addr_prop;
104	u32 *spin_table;
105	extern void start_secondary_47x(void);
106
107	BUG_ON(cpunode == NULL);
108
109	/* Assume spin table. We could test for the enable-method in
110	 * the device-tree but currently there's little point as it's
111	 * our only supported method
112	 */
113	spin_table_addr_prop =
114		of_get_property(cpunode, "cpu-release-addr", NULL);
115
116	if (spin_table_addr_prop == NULL) {
117		pr_err("CPU%d: Can't start, missing cpu-release-addr !\n",
118		       cpu);
119		return 1;
120	}
121
122	/* Assume it's mapped as part of the linear mapping. This is a bit
123	 * fishy but will work fine for now
124	 *
125	 * XXX: Is there any reason to assume differently?
126	 */
127	spin_table = (u32 *)__va(*spin_table_addr_prop);
128	pr_debug("CPU%d: Spin table mapped at %p\n", cpu, spin_table);
129
130	spin_table[3] = cpu;
131	smp_wmb();
132	spin_table[1] = __pa(start_secondary_47x);
133	mb();
134
135	return 0;
136}
137
138static struct smp_ops_t ppc47x_smp_ops = {
139	.probe		= smp_mpic_probe,
140	.message_pass	= smp_mpic_message_pass,
141	.setup_cpu	= smp_ppc47x_setup_cpu,
142	.kick_cpu	= smp_ppc47x_kick_cpu,
143	.give_timebase	= smp_generic_give_timebase,
144	.take_timebase	= smp_generic_take_timebase,
145};
146
147static void __init ppc47x_smp_init(void)
148{
149	if (mmu_has_feature(MMU_FTR_TYPE_47x))
150		smp_ops = &ppc47x_smp_ops;
151}
152
153#else /* CONFIG_SMP */
154static void __init ppc47x_smp_init(void) { }
155#endif /* CONFIG_SMP */
156
157static void __init ppc47x_setup_arch(void)
158{
159
160	/* No need to check the DMA config as we /know/ our windows are all of
161 	 * RAM.  Lets hope that doesn't change */
162#ifdef CONFIG_SWIOTLB
163	if (memblock_end_of_DRAM() > 0xffffffff) {
164		ppc_swiotlb_enable = 1;
165		set_pci_dma_ops(&swiotlb_dma_ops);
166		ppc_md.pci_dma_dev_setup = pci_dma_dev_setup_swiotlb;
167	}
168#endif
169	ppc47x_smp_init();
170}
171
172/*
173 * Called very early, MMU is off, device-tree isn't unflattened
174 */
175static int __init ppc47x_probe(void)
176{
177	unsigned long root = of_get_flat_dt_root();
178
179	if (!of_flat_dt_is_compatible(root, "ibm,currituck"))
180		return 0;
181
182	return 1;
183}
184
185/* Use USB controller should have been hardware swizzled but it wasn't :( */
186static void ppc47x_pci_irq_fixup(struct pci_dev *dev)
187{
188	if (dev->vendor == 0x1033 && (dev->device == 0x0035 ||
189	                              dev->device == 0x00e0)) {
190		dev->irq = irq_create_mapping(NULL, 47);
191		pr_info("%s: Mapping irq 47 %d\n", __func__, dev->irq);
192	}
193}
194
195define_machine(ppc47x) {
196	.name			= "PowerPC 47x",
197	.probe			= ppc47x_probe,
198	.progress		= udbg_progress,
199	.init_IRQ		= ppc47x_init_irq,
200	.setup_arch		= ppc47x_setup_arch,
201	.pci_irq_fixup		= ppc47x_pci_irq_fixup,
202	.restart		= ppc4xx_reset_system,
203	.calibrate_decr		= generic_calibrate_decr,
204};
205