1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /*
3  * MPC85xx DS Board Setup
4  *
5  * Author Xianghua Xiao (x.xiao@freescale.com)
6  * Roy Zang <tie-fei.zang@freescale.com>
7  * 	- Add PCI/PCI Exprees support
8  * Copyright 2007 Freescale Semiconductor Inc.
9  */
10 
11 #include <linux/stddef.h>
12 #include <linux/kernel.h>
13 #include <linux/pci.h>
14 #include <linux/kdev_t.h>
15 #include <linux/delay.h>
16 #include <linux/seq_file.h>
17 #include <linux/interrupt.h>
18 #include <linux/of_irq.h>
19 #include <linux/of_platform.h>
20 
21 #include <asm/time.h>
22 #include <asm/machdep.h>
23 #include <asm/pci-bridge.h>
24 #include <mm/mmu_decl.h>
25 #include <asm/udbg.h>
26 #include <asm/mpic.h>
27 #include <asm/i8259.h>
28 #include <asm/swiotlb.h>
29 
30 #include <sysdev/fsl_soc.h>
31 #include <sysdev/fsl_pci.h>
32 #include "smp.h"
33 
34 #include "mpc85xx.h"
35 
36 #undef DEBUG
37 
38 #ifdef DEBUG
39 #define DBG(fmt, args...) printk(KERN_ERR "%s: " fmt, __func__, ## args)
40 #else
41 #define DBG(fmt, args...)
42 #endif
43 
44 #ifdef CONFIG_PPC_I8259
45 static void mpc85xx_8259_cascade(struct irq_desc *desc)
46 {
47 	struct irq_chip *chip = irq_desc_get_chip(desc);
48 	unsigned int cascade_irq = i8259_irq();
49 
50 	if (cascade_irq) {
51 		generic_handle_irq(cascade_irq);
52 	}
53 	chip->irq_eoi(&desc->irq_data);
54 }
55 #endif	/* CONFIG_PPC_I8259 */
56 
57 void __init mpc85xx_ds_pic_init(void)
58 {
59 	struct mpic *mpic;
60 #ifdef CONFIG_PPC_I8259
61 	struct device_node *np;
62 	struct device_node *cascade_node = NULL;
63 	int cascade_irq;
64 #endif
65 	if (of_machine_is_compatible("fsl,MPC8572DS-CAMP")) {
66 		mpic = mpic_alloc(NULL, 0,
67 			MPIC_NO_RESET |
68 			MPIC_BIG_ENDIAN |
69 			MPIC_SINGLE_DEST_CPU,
70 			0, 256, " OpenPIC  ");
71 	} else {
72 		mpic = mpic_alloc(NULL, 0,
73 			  MPIC_BIG_ENDIAN |
74 			  MPIC_SINGLE_DEST_CPU,
75 			0, 256, " OpenPIC  ");
76 	}
77 
78 	BUG_ON(mpic == NULL);
79 	mpic_init(mpic);
80 
81 #ifdef CONFIG_PPC_I8259
82 	/* Initialize the i8259 controller */
83 	for_each_node_by_type(np, "interrupt-controller")
84 	    if (of_device_is_compatible(np, "chrp,iic")) {
85 		cascade_node = np;
86 		break;
87 	}
88 
89 	if (cascade_node == NULL) {
90 		printk(KERN_DEBUG "Could not find i8259 PIC\n");
91 		return;
92 	}
93 
94 	cascade_irq = irq_of_parse_and_map(cascade_node, 0);
95 	if (!cascade_irq) {
96 		printk(KERN_ERR "Failed to map cascade interrupt\n");
97 		return;
98 	}
99 
100 	DBG("mpc85xxds: cascade mapped to irq %d\n", cascade_irq);
101 
102 	i8259_init(cascade_node, 0);
103 	of_node_put(cascade_node);
104 
105 	irq_set_chained_handler(cascade_irq, mpc85xx_8259_cascade);
106 #endif	/* CONFIG_PPC_I8259 */
107 }
108 
109 #ifdef CONFIG_PCI
110 extern int uli_exclude_device(struct pci_controller *hose,
111 				u_char bus, u_char devfn);
112 
113 static struct device_node *pci_with_uli;
114 
115 static int mpc85xx_exclude_device(struct pci_controller *hose,
116 				   u_char bus, u_char devfn)
117 {
118 	if (hose->dn == pci_with_uli)
119 		return uli_exclude_device(hose, bus, devfn);
120 
121 	return PCIBIOS_SUCCESSFUL;
122 }
123 #endif	/* CONFIG_PCI */
124 
125 static void __init mpc85xx_ds_uli_init(void)
126 {
127 #ifdef CONFIG_PCI
128 	struct device_node *node;
129 
130 	/* See if we have a ULI under the primary */
131 
132 	node = of_find_node_by_name(NULL, "uli1575");
133 	while ((pci_with_uli = of_get_parent(node))) {
134 		of_node_put(node);
135 		node = pci_with_uli;
136 
137 		if (pci_with_uli == fsl_pci_primary) {
138 			ppc_md.pci_exclude_device = mpc85xx_exclude_device;
139 			break;
140 		}
141 	}
142 #endif
143 }
144 
145 /*
146  * Setup the architecture
147  */
148 static void __init mpc85xx_ds_setup_arch(void)
149 {
150 	if (ppc_md.progress)
151 		ppc_md.progress("mpc85xx_ds_setup_arch()", 0);
152 
153 	swiotlb_detect_4g();
154 	fsl_pci_assign_primary();
155 	mpc85xx_ds_uli_init();
156 	mpc85xx_smp_init();
157 
158 	printk("MPC85xx DS board from Freescale Semiconductor\n");
159 }
160 
161 /*
162  * Called very early, device-tree isn't unflattened
163  */
164 static int __init mpc8544_ds_probe(void)
165 {
166 	return !!of_machine_is_compatible("MPC8544DS");
167 }
168 
169 machine_arch_initcall(mpc8544_ds, mpc85xx_common_publish_devices);
170 machine_arch_initcall(mpc8572_ds, mpc85xx_common_publish_devices);
171 machine_arch_initcall(p2020_ds, mpc85xx_common_publish_devices);
172 
173 /*
174  * Called very early, device-tree isn't unflattened
175  */
176 static int __init mpc8572_ds_probe(void)
177 {
178 	return !!of_machine_is_compatible("fsl,MPC8572DS");
179 }
180 
181 /*
182  * Called very early, device-tree isn't unflattened
183  */
184 static int __init p2020_ds_probe(void)
185 {
186 	return !!of_machine_is_compatible("fsl,P2020DS");
187 }
188 
189 define_machine(mpc8544_ds) {
190 	.name			= "MPC8544 DS",
191 	.probe			= mpc8544_ds_probe,
192 	.setup_arch		= mpc85xx_ds_setup_arch,
193 	.init_IRQ		= mpc85xx_ds_pic_init,
194 #ifdef CONFIG_PCI
195 	.pcibios_fixup_bus	= fsl_pcibios_fixup_bus,
196 	.pcibios_fixup_phb      = fsl_pcibios_fixup_phb,
197 #endif
198 	.get_irq		= mpic_get_irq,
199 	.calibrate_decr		= generic_calibrate_decr,
200 	.progress		= udbg_progress,
201 };
202 
203 define_machine(mpc8572_ds) {
204 	.name			= "MPC8572 DS",
205 	.probe			= mpc8572_ds_probe,
206 	.setup_arch		= mpc85xx_ds_setup_arch,
207 	.init_IRQ		= mpc85xx_ds_pic_init,
208 #ifdef CONFIG_PCI
209 	.pcibios_fixup_bus	= fsl_pcibios_fixup_bus,
210 	.pcibios_fixup_phb      = fsl_pcibios_fixup_phb,
211 #endif
212 	.get_irq		= mpic_get_irq,
213 	.calibrate_decr		= generic_calibrate_decr,
214 	.progress		= udbg_progress,
215 };
216 
217 define_machine(p2020_ds) {
218 	.name			= "P2020 DS",
219 	.probe			= p2020_ds_probe,
220 	.setup_arch		= mpc85xx_ds_setup_arch,
221 	.init_IRQ		= mpc85xx_ds_pic_init,
222 #ifdef CONFIG_PCI
223 	.pcibios_fixup_bus	= fsl_pcibios_fixup_bus,
224 	.pcibios_fixup_phb      = fsl_pcibios_fixup_phb,
225 #endif
226 	.get_irq		= mpic_get_irq,
227 	.calibrate_decr		= generic_calibrate_decr,
228 	.progress		= udbg_progress,
229 };
230