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 #include <linux/of_platform.h>
23 
24 #include <asm/system.h>
25 #include <asm/time.h>
26 #include <asm/machdep.h>
27 #include <asm/pci-bridge.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 
37 #undef DEBUG
38 
39 #ifdef DEBUG
40 #define DBG(fmt, args...) printk(KERN_ERR "%s: " fmt, __func__, ## args)
41 #else
42 #define DBG(fmt, args...)
43 #endif
44 
45 #ifdef CONFIG_PPC_I8259
46 static void mpc85xx_8259_cascade(unsigned int irq, struct irq_desc *desc)
47 {
48 	unsigned int cascade_irq = i8259_irq();
49 
50 	if (cascade_irq != NO_IRQ) {
51 		generic_handle_irq(cascade_irq);
52 	}
53 	desc->chip->eoi(irq);
54 }
55 #endif	/* CONFIG_PPC_I8259 */
56 
57 void __init mpc85xx_ds_pic_init(void)
58 {
59 	struct mpic *mpic;
60 	struct resource r;
61 	struct device_node *np;
62 #ifdef CONFIG_PPC_I8259
63 	struct device_node *cascade_node = NULL;
64 	int cascade_irq;
65 #endif
66 	unsigned long root = of_get_flat_dt_root();
67 
68 	np = of_find_node_by_type(NULL, "open-pic");
69 	if (np == NULL) {
70 		printk(KERN_ERR "Could not find open-pic node\n");
71 		return;
72 	}
73 
74 	if (of_address_to_resource(np, 0, &r)) {
75 		printk(KERN_ERR "Failed to map mpic register space\n");
76 		of_node_put(np);
77 		return;
78 	}
79 
80 	if (of_flat_dt_is_compatible(root, "fsl,MPC8572DS-CAMP")) {
81 		mpic = mpic_alloc(np, r.start,
82 			MPIC_PRIMARY |
83 			MPIC_BIG_ENDIAN | MPIC_BROKEN_FRR_NIRQS,
84 			0, 256, " OpenPIC  ");
85 	} else {
86 		mpic = mpic_alloc(np, r.start,
87 			  MPIC_PRIMARY | MPIC_WANTS_RESET |
88 			  MPIC_BIG_ENDIAN | MPIC_BROKEN_FRR_NIRQS |
89 			  MPIC_SINGLE_DEST_CPU,
90 			0, 256, " OpenPIC  ");
91 	}
92 
93 	BUG_ON(mpic == NULL);
94 	of_node_put(np);
95 
96 	mpic_init(mpic);
97 
98 #ifdef CONFIG_PPC_I8259
99 	/* Initialize the i8259 controller */
100 	for_each_node_by_type(np, "interrupt-controller")
101 	    if (of_device_is_compatible(np, "chrp,iic")) {
102 		cascade_node = np;
103 		break;
104 	}
105 
106 	if (cascade_node == NULL) {
107 		printk(KERN_DEBUG "Could not find i8259 PIC\n");
108 		return;
109 	}
110 
111 	cascade_irq = irq_of_parse_and_map(cascade_node, 0);
112 	if (cascade_irq == NO_IRQ) {
113 		printk(KERN_ERR "Failed to map cascade interrupt\n");
114 		return;
115 	}
116 
117 	DBG("mpc85xxds: cascade mapped to irq %d\n", cascade_irq);
118 
119 	i8259_init(cascade_node, 0);
120 	of_node_put(cascade_node);
121 
122 	set_irq_chained_handler(cascade_irq, mpc85xx_8259_cascade);
123 #endif	/* CONFIG_PPC_I8259 */
124 }
125 
126 #ifdef CONFIG_PCI
127 static int primary_phb_addr;
128 extern int uli_exclude_device(struct pci_controller *hose,
129 				u_char bus, u_char devfn);
130 
131 static int mpc85xx_exclude_device(struct pci_controller *hose,
132 				   u_char bus, u_char devfn)
133 {
134 	struct device_node* node;
135 	struct resource rsrc;
136 
137 	node = hose->dn;
138 	of_address_to_resource(node, 0, &rsrc);
139 
140 	if ((rsrc.start & 0xfffff) == primary_phb_addr) {
141 		return uli_exclude_device(hose, bus, devfn);
142 	}
143 
144 	return PCIBIOS_SUCCESSFUL;
145 }
146 #endif	/* CONFIG_PCI */
147 
148 /*
149  * Setup the architecture
150  */
151 #ifdef CONFIG_SMP
152 extern void __init mpc85xx_smp_init(void);
153 #endif
154 static void __init mpc85xx_ds_setup_arch(void)
155 {
156 #ifdef CONFIG_PCI
157 	struct device_node *np;
158 #endif
159 
160 	if (ppc_md.progress)
161 		ppc_md.progress("mpc85xx_ds_setup_arch()", 0);
162 
163 #ifdef CONFIG_PCI
164 	for_each_node_by_type(np, "pci") {
165 		if (of_device_is_compatible(np, "fsl,mpc8540-pci") ||
166 		    of_device_is_compatible(np, "fsl,mpc8548-pcie")) {
167 			struct resource rsrc;
168 			of_address_to_resource(np, 0, &rsrc);
169 			if ((rsrc.start & 0xfffff) == primary_phb_addr)
170 				fsl_add_bridge(np, 1);
171 			else
172 				fsl_add_bridge(np, 0);
173 		}
174 	}
175 
176 	ppc_md.pci_exclude_device = mpc85xx_exclude_device;
177 #endif
178 
179 #ifdef CONFIG_SMP
180 	mpc85xx_smp_init();
181 #endif
182 
183 	printk("MPC85xx DS board from Freescale Semiconductor\n");
184 }
185 
186 /*
187  * Called very early, device-tree isn't unflattened
188  */
189 static int __init mpc8544_ds_probe(void)
190 {
191 	unsigned long root = of_get_flat_dt_root();
192 
193 	if (of_flat_dt_is_compatible(root, "MPC8544DS")) {
194 #ifdef CONFIG_PCI
195 		primary_phb_addr = 0xb000;
196 #endif
197 		return 1;
198 	} else {
199 		return 0;
200 	}
201 }
202 
203 static struct of_device_id __initdata mpc85xxds_ids[] = {
204 	{ .type = "soc", },
205 	{ .compatible = "soc", },
206 	{ .compatible = "simple-bus", },
207 	{ .compatible = "gianfar", },
208 	{},
209 };
210 
211 static int __init mpc85xxds_publish_devices(void)
212 {
213 	return of_platform_bus_probe(NULL, mpc85xxds_ids, NULL);
214 }
215 machine_device_initcall(mpc8544_ds, mpc85xxds_publish_devices);
216 machine_device_initcall(mpc8572_ds, mpc85xxds_publish_devices);
217 
218 /*
219  * Called very early, device-tree isn't unflattened
220  */
221 static int __init mpc8572_ds_probe(void)
222 {
223 	unsigned long root = of_get_flat_dt_root();
224 
225 	if (of_flat_dt_is_compatible(root, "fsl,MPC8572DS")) {
226 #ifdef CONFIG_PCI
227 		primary_phb_addr = 0x8000;
228 #endif
229 		return 1;
230 	} else {
231 		return 0;
232 	}
233 }
234 
235 define_machine(mpc8544_ds) {
236 	.name			= "MPC8544 DS",
237 	.probe			= mpc8544_ds_probe,
238 	.setup_arch		= mpc85xx_ds_setup_arch,
239 	.init_IRQ		= mpc85xx_ds_pic_init,
240 #ifdef CONFIG_PCI
241 	.pcibios_fixup_bus	= fsl_pcibios_fixup_bus,
242 #endif
243 	.get_irq		= mpic_get_irq,
244 	.restart		= fsl_rstcr_restart,
245 	.calibrate_decr		= generic_calibrate_decr,
246 	.progress		= udbg_progress,
247 };
248 
249 define_machine(mpc8572_ds) {
250 	.name			= "MPC8572 DS",
251 	.probe			= mpc8572_ds_probe,
252 	.setup_arch		= mpc85xx_ds_setup_arch,
253 	.init_IRQ		= mpc85xx_ds_pic_init,
254 #ifdef CONFIG_PCI
255 	.pcibios_fixup_bus	= fsl_pcibios_fixup_bus,
256 #endif
257 	.get_irq		= mpic_get_irq,
258 	.restart		= fsl_rstcr_restart,
259 	.calibrate_decr		= generic_calibrate_decr,
260 	.progress		= udbg_progress,
261 };
262