[POWERPC] MPC5200 low power mode
[linux-2.6] / arch / powerpc / platforms / 85xx / mpc85xx_ds.c
1 /*
2  * MPC85xx DS Board Setup
3  *
4  * Author Xianghua Xiao (x.xiao@freescale.com)
5  * Roy Zang <tie-fei.zang@freescale.com>
6  *      - Add PCI/PCI Exprees support
7  * Copyright 2007 Freescale Semiconductor Inc.
8  *
9  * This program is free software; you can redistribute  it and/or modify it
10  * under  the terms of  the GNU General  Public License as published by the
11  * Free Software Foundation;  either version 2 of the  License, or (at your
12  * option) any later version.
13  */
14
15 #include <linux/stddef.h>
16 #include <linux/kernel.h>
17 #include <linux/pci.h>
18 #include <linux/kdev_t.h>
19 #include <linux/delay.h>
20 #include <linux/seq_file.h>
21 #include <linux/interrupt.h>
22
23 #include <asm/system.h>
24 #include <asm/time.h>
25 #include <asm/machdep.h>
26 #include <asm/pci-bridge.h>
27 #include <asm/mpc85xx.h>
28 #include <mm/mmu_decl.h>
29 #include <asm/prom.h>
30 #include <asm/udbg.h>
31 #include <asm/mpic.h>
32 #include <asm/i8259.h>
33
34 #include <sysdev/fsl_soc.h>
35 #include <sysdev/fsl_pci.h>
36 #include "mpc85xx.h"
37
38 #undef DEBUG
39
40 #ifdef DEBUG
41 #define DBG(fmt, args...) printk(KERN_ERR "%s: " fmt, __FUNCTION__, ## args)
42 #else
43 #define DBG(fmt, args...)
44 #endif
45
46 #ifdef CONFIG_PPC_I8259
47 static void mpc85xx_8259_cascade(unsigned int irq, struct irq_desc *desc)
48 {
49         unsigned int cascade_irq = i8259_irq();
50
51         if (cascade_irq != NO_IRQ) {
52                 generic_handle_irq(cascade_irq);
53         }
54         desc->chip->eoi(irq);
55 }
56 #endif  /* CONFIG_PPC_I8259 */
57
58 void __init mpc85xx_ds_pic_init(void)
59 {
60         struct mpic *mpic;
61         struct resource r;
62         struct device_node *np = NULL;
63 #ifdef CONFIG_PPC_I8259
64         struct device_node *cascade_node = NULL;
65         int cascade_irq;
66 #endif
67
68         np = of_find_node_by_type(np, "open-pic");
69
70         if (np == NULL) {
71                 printk(KERN_ERR "Could not find open-pic node\n");
72                 return;
73         }
74
75         if (of_address_to_resource(np, 0, &r)) {
76                 printk(KERN_ERR "Failed to map mpic register space\n");
77                 of_node_put(np);
78                 return;
79         }
80
81         mpic = mpic_alloc(np, r.start,
82                           MPIC_PRIMARY | MPIC_WANTS_RESET | MPIC_BIG_ENDIAN,
83                         0, 256, " OpenPIC  ");
84         BUG_ON(mpic == NULL);
85
86         mpic_init(mpic);
87
88 #ifdef CONFIG_PPC_I8259
89         /* Initialize the i8259 controller */
90         for_each_node_by_type(np, "interrupt-controller")
91             if (of_device_is_compatible(np, "chrp,iic")) {
92                 cascade_node = np;
93                 break;
94         }
95
96         if (cascade_node == NULL) {
97                 printk(KERN_DEBUG "Could not find i8259 PIC\n");
98                 return;
99         }
100
101         cascade_irq = irq_of_parse_and_map(cascade_node, 0);
102         if (cascade_irq == NO_IRQ) {
103                 printk(KERN_ERR "Failed to map cascade interrupt\n");
104                 return;
105         }
106
107         DBG("mpc85xxds: cascade mapped to irq %d\n", cascade_irq);
108
109         i8259_init(cascade_node, 0);
110         of_node_put(cascade_node);
111
112         set_irq_chained_handler(cascade_irq, mpc85xx_8259_cascade);
113 #endif  /* CONFIG_PPC_I8259 */
114 }
115
116 #ifdef CONFIG_PCI
117 static int primary_phb_addr;
118 extern int uses_fsl_uli_m1575;
119 extern int uli_exclude_device(struct pci_controller *hose,
120                                 u_char bus, u_char devfn);
121
122 static int mpc85xx_exclude_device(struct pci_controller *hose,
123                                    u_char bus, u_char devfn)
124 {
125         struct device_node* node;
126         struct resource rsrc;
127
128         node = (struct device_node *)hose->arch_data;
129         of_address_to_resource(node, 0, &rsrc);
130
131         if ((rsrc.start & 0xfffff) == primary_phb_addr) {
132                 return uli_exclude_device(hose, bus, devfn);
133         }
134
135         return PCIBIOS_SUCCESSFUL;
136 }
137 #endif  /* CONFIG_PCI */
138
139 /*
140  * Setup the architecture
141  */
142 static void __init mpc85xx_ds_setup_arch(void)
143 {
144 #ifdef CONFIG_PCI
145         struct device_node *np;
146 #endif
147
148         if (ppc_md.progress)
149                 ppc_md.progress("mpc85xx_ds_setup_arch()", 0);
150
151 #ifdef CONFIG_PCI
152         for (np = NULL; (np = of_find_node_by_type(np, "pci")) != NULL;) {
153                 struct resource rsrc;
154                 of_address_to_resource(np, 0, &rsrc);
155                 if ((rsrc.start & 0xfffff) == primary_phb_addr)
156                         fsl_add_bridge(np, 1);
157                 else
158                         fsl_add_bridge(np, 0);
159         }
160         uses_fsl_uli_m1575 = 1;
161         ppc_md.pci_exclude_device = mpc85xx_exclude_device;
162 #endif
163
164         printk("MPC85xx DS board from Freescale Semiconductor\n");
165 }
166
167 /*
168  * Called very early, device-tree isn't unflattened
169  */
170 static int __init mpc8544_ds_probe(void)
171 {
172         unsigned long root = of_get_flat_dt_root();
173
174         if (of_flat_dt_is_compatible(root, "MPC8544DS")) {
175 #ifdef CONFIG_PCI
176                 primary_phb_addr = 0xb000;
177 #endif
178                 return 1;
179         } else {
180                 return 0;
181         }
182 }
183
184 /*
185  * Called very early, device-tree isn't unflattened
186  */
187 static int __init mpc8572_ds_probe(void)
188 {
189         unsigned long root = of_get_flat_dt_root();
190
191         if (of_flat_dt_is_compatible(root, "fsl,MPC8572DS")) {
192 #ifdef CONFIG_PCI
193                 primary_phb_addr = 0x8000;
194 #endif
195                 return 1;
196         } else {
197                 return 0;
198         }
199 }
200
201 define_machine(mpc8544_ds) {
202         .name                   = "MPC8544 DS",
203         .probe                  = mpc8544_ds_probe,
204         .setup_arch             = mpc85xx_ds_setup_arch,
205         .init_IRQ               = mpc85xx_ds_pic_init,
206 #ifdef CONFIG_PCI
207         .pcibios_fixup_bus      = fsl_pcibios_fixup_bus,
208 #endif
209         .get_irq                = mpic_get_irq,
210         .restart                = mpc85xx_restart,
211         .calibrate_decr         = generic_calibrate_decr,
212         .progress               = udbg_progress,
213 };
214
215 define_machine(mpc8572_ds) {
216         .name                   = "MPC8572 DS",
217         .probe                  = mpc8572_ds_probe,
218         .setup_arch             = mpc85xx_ds_setup_arch,
219         .init_IRQ               = mpc85xx_ds_pic_init,
220 #ifdef CONFIG_PCI
221         .pcibios_fixup_bus      = fsl_pcibios_fixup_bus,
222 #endif
223         .get_irq                = mpic_get_irq,
224         .restart                = mpc85xx_restart,
225         .calibrate_decr         = generic_calibrate_decr,
226         .progress               = udbg_progress,
227 };