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
40 static __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 */
quirk_ppc_currituck_usb_fixup(struct pci_dev * dev)50 static 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 }
57 DECLARE_PCI_FIXUP_HEADER(0x1033, 0x0035, quirk_ppc_currituck_usb_fixup);
58
ppc47x_device_probe(void)59 static int __init ppc47x_device_probe(void)
60 {
61 of_platform_bus_probe(NULL, ppc47x_of_bus, NULL);
62
63 return 0;
64 }
65 machine_device_initcall(ppc47x, ppc47x_device_probe);
66
67 /* We can have either UICs or MPICs */
ppc47x_init_irq(void)68 static 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, 0, 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
smp_ppc47x_setup_cpu(int cpu)95 static void __cpuinit smp_ppc47x_setup_cpu(int cpu)
96 {
97 mpic_setup_this_cpu();
98 }
99
smp_ppc47x_kick_cpu(int cpu)100 static 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
138 static 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
ppc47x_smp_init(void)147 static 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 */
ppc47x_smp_init(void)154 static void __init ppc47x_smp_init(void) { }
155 #endif /* CONFIG_SMP */
156
ppc47x_setup_arch(void)157 static 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 */
ppc47x_probe(void)175 static 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 :( */
ppc47x_pci_irq_fixup(struct pci_dev * dev)186 static 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
define_machine(ppc47x)195 define_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