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 = NULL;
62 #ifdef CONFIG_PPC_I8259
63 	struct device_node *cascade_node = NULL;
64 	int cascade_irq;
65 #endif
66 
67 	np = of_find_node_by_type(np, "open-pic");
68 
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 	mpic = mpic_alloc(np, r.start,
81 			  MPIC_PRIMARY | MPIC_WANTS_RESET | MPIC_BIG_ENDIAN,
82 			0, 256, " OpenPIC  ");
83 	BUG_ON(mpic == NULL);
84 
85 	mpic_init(mpic);
86 
87 #ifdef CONFIG_PPC_I8259
88 	/* Initialize the i8259 controller */
89 	for_each_node_by_type(np, "interrupt-controller")
90 	    if (of_device_is_compatible(np, "chrp,iic")) {
91 		cascade_node = np;
92 		break;
93 	}
94 
95 	if (cascade_node == NULL) {
96 		printk(KERN_DEBUG "Could not find i8259 PIC\n");
97 		return;
98 	}
99 
100 	cascade_irq = irq_of_parse_and_map(cascade_node, 0);
101 	if (cascade_irq == NO_IRQ) {
102 		printk(KERN_ERR "Failed to map cascade interrupt\n");
103 		return;
104 	}
105 
106 	DBG("mpc85xxds: cascade mapped to irq %d\n", cascade_irq);
107 
108 	i8259_init(cascade_node, 0);
109 	of_node_put(cascade_node);
110 
111 	set_irq_chained_handler(cascade_irq, mpc85xx_8259_cascade);
112 #endif	/* CONFIG_PPC_I8259 */
113 }
114 
115 #ifdef CONFIG_PCI
116 static int primary_phb_addr;
117 extern int uses_fsl_uli_m1575;
118 extern int uli_exclude_device(struct pci_controller *hose,
119 				u_char bus, u_char devfn);
120 
121 static int mpc85xx_exclude_device(struct pci_controller *hose,
122 				   u_char bus, u_char devfn)
123 {
124 	struct device_node* node;
125 	struct resource rsrc;
126 
127 	node = hose->dn;
128 	of_address_to_resource(node, 0, &rsrc);
129 
130 	if ((rsrc.start & 0xfffff) == primary_phb_addr) {
131 		return uli_exclude_device(hose, bus, devfn);
132 	}
133 
134 	return PCIBIOS_SUCCESSFUL;
135 }
136 #endif	/* CONFIG_PCI */
137 
138 /*
139  * Setup the architecture
140  */
141 static void __init mpc85xx_ds_setup_arch(void)
142 {
143 #ifdef CONFIG_PCI
144 	struct device_node *np;
145 #endif
146 
147 	if (ppc_md.progress)
148 		ppc_md.progress("mpc85xx_ds_setup_arch()", 0);
149 
150 #ifdef CONFIG_PCI
151 	for_each_node_by_type(np, "pci") {
152 		if (of_device_is_compatible(np, "fsl,mpc8540-pci") ||
153 		    of_device_is_compatible(np, "fsl,mpc8548-pcie")) {
154 			struct resource rsrc;
155 			of_address_to_resource(np, 0, &rsrc);
156 			if ((rsrc.start & 0xfffff) == primary_phb_addr)
157 				fsl_add_bridge(np, 1);
158 			else
159 				fsl_add_bridge(np, 0);
160 		}
161 	}
162 
163 	uses_fsl_uli_m1575 = 1;
164 	ppc_md.pci_exclude_device = mpc85xx_exclude_device;
165 #endif
166 
167 	printk("MPC85xx DS board from Freescale Semiconductor\n");
168 }
169 
170 /*
171  * Called very early, device-tree isn't unflattened
172  */
173 static int __init mpc8544_ds_probe(void)
174 {
175 	unsigned long root = of_get_flat_dt_root();
176 
177 	if (of_flat_dt_is_compatible(root, "MPC8544DS")) {
178 #ifdef CONFIG_PCI
179 		primary_phb_addr = 0xb000;
180 #endif
181 		return 1;
182 	} else {
183 		return 0;
184 	}
185 }
186 
187 static struct of_device_id mpc85xxds_ids[] = {
188 	{ .type = "soc", },
189 	{ .compatible = "soc", },
190 	{},
191 };
192 
193 static int __init mpc85xxds_publish_devices(void)
194 {
195 	return of_platform_bus_probe(NULL, mpc85xxds_ids, NULL);
196 }
197 machine_device_initcall(mpc8544_ds, mpc85xxds_publish_devices);
198 
199 /*
200  * Called very early, device-tree isn't unflattened
201  */
202 static int __init mpc8572_ds_probe(void)
203 {
204 	unsigned long root = of_get_flat_dt_root();
205 
206 	if (of_flat_dt_is_compatible(root, "fsl,MPC8572DS")) {
207 #ifdef CONFIG_PCI
208 		primary_phb_addr = 0x8000;
209 #endif
210 		return 1;
211 	} else {
212 		return 0;
213 	}
214 }
215 
216 define_machine(mpc8544_ds) {
217 	.name			= "MPC8544 DS",
218 	.probe			= mpc8544_ds_probe,
219 	.setup_arch		= mpc85xx_ds_setup_arch,
220 	.init_IRQ		= mpc85xx_ds_pic_init,
221 #ifdef CONFIG_PCI
222 	.pcibios_fixup_bus	= fsl_pcibios_fixup_bus,
223 #endif
224 	.get_irq		= mpic_get_irq,
225 	.restart		= fsl_rstcr_restart,
226 	.calibrate_decr		= generic_calibrate_decr,
227 	.progress		= udbg_progress,
228 };
229 
230 define_machine(mpc8572_ds) {
231 	.name			= "MPC8572 DS",
232 	.probe			= mpc8572_ds_probe,
233 	.setup_arch		= mpc85xx_ds_setup_arch,
234 	.init_IRQ		= mpc85xx_ds_pic_init,
235 #ifdef CONFIG_PCI
236 	.pcibios_fixup_bus	= fsl_pcibios_fixup_bus,
237 #endif
238 	.get_irq		= mpic_get_irq,
239 	.restart		= fsl_rstcr_restart,
240 	.calibrate_decr		= generic_calibrate_decr,
241 	.progress		= udbg_progress,
242 };
243