1 /*
2  * GE IMP3A Board Setup
3  *
4  * Author Martyn Welch <martyn.welch@ge.com>
5  *
6  * Copyright 2010 GE Intelligent Platforms Embedded Systems, Inc.
7  *
8  * This program is free software; you can redistribute  it and/or modify it
9  * under  the terms of  the GNU General  Public License as published by the
10  * Free Software Foundation;  either version 2 of the  License, or (at your
11  * option) any later version.
12  *
13  * Based on: mpc85xx_ds.c (MPC85xx DS Board Setup)
14  * Copyright 2007 Freescale Semiconductor Inc.
15  */
16 
17 #include <linux/stddef.h>
18 #include <linux/kernel.h>
19 #include <linux/pci.h>
20 #include <linux/kdev_t.h>
21 #include <linux/delay.h>
22 #include <linux/seq_file.h>
23 #include <linux/interrupt.h>
24 #include <linux/of_platform.h>
25 
26 #include <asm/time.h>
27 #include <asm/machdep.h>
28 #include <asm/pci-bridge.h>
29 #include <mm/mmu_decl.h>
30 #include <asm/prom.h>
31 #include <asm/udbg.h>
32 #include <asm/mpic.h>
33 #include <asm/swiotlb.h>
34 #include <asm/nvram.h>
35 
36 #include <sysdev/fsl_soc.h>
37 #include <sysdev/fsl_pci.h>
38 #include "smp.h"
39 
40 #include "mpc85xx.h"
41 #include <sysdev/ge/ge_pic.h>
42 
43 void __iomem *imp3a_regs;
44 
45 void __init ge_imp3a_pic_init(void)
46 {
47 	struct mpic *mpic;
48 	struct device_node *np;
49 	struct device_node *cascade_node = NULL;
50 
51 	if (of_machine_is_compatible("fsl,MPC8572DS-CAMP")) {
52 		mpic = mpic_alloc(NULL, 0,
53 			MPIC_NO_RESET |
54 			MPIC_BIG_ENDIAN |
55 			MPIC_SINGLE_DEST_CPU,
56 			0, 256, " OpenPIC  ");
57 	} else {
58 		mpic = mpic_alloc(NULL, 0,
59 			  MPIC_BIG_ENDIAN |
60 			  MPIC_SINGLE_DEST_CPU,
61 			0, 256, " OpenPIC  ");
62 	}
63 
64 	BUG_ON(mpic == NULL);
65 	mpic_init(mpic);
66 	/*
67 	 * There is a simple interrupt handler in the main FPGA, this needs
68 	 * to be cascaded into the MPIC
69 	 */
70 	for_each_node_by_type(np, "interrupt-controller")
71 		if (of_device_is_compatible(np, "gef,fpga-pic-1.00")) {
72 			cascade_node = np;
73 			break;
74 		}
75 
76 	if (cascade_node == NULL) {
77 		printk(KERN_WARNING "IMP3A: No FPGA PIC\n");
78 		return;
79 	}
80 
81 	gef_pic_init(cascade_node);
82 	of_node_put(cascade_node);
83 }
84 
85 static void ge_imp3a_pci_assign_primary(void)
86 {
87 #ifdef CONFIG_PCI
88 	struct device_node *np;
89 	struct resource rsrc;
90 
91 	for_each_node_by_type(np, "pci") {
92 		if (of_device_is_compatible(np, "fsl,mpc8540-pci") ||
93 		    of_device_is_compatible(np, "fsl,mpc8548-pcie") ||
94 		    of_device_is_compatible(np, "fsl,p2020-pcie")) {
95 			of_address_to_resource(np, 0, &rsrc);
96 			if ((rsrc.start & 0xfffff) == 0x9000)
97 				fsl_pci_primary = np;
98 		}
99 	}
100 #endif
101 }
102 
103 /*
104  * Setup the architecture
105  */
106 static void __init ge_imp3a_setup_arch(void)
107 {
108 	struct device_node *regs;
109 
110 	if (ppc_md.progress)
111 		ppc_md.progress("ge_imp3a_setup_arch()", 0);
112 
113 	mpc85xx_smp_init();
114 
115 	ge_imp3a_pci_assign_primary();
116 
117 	swiotlb_detect_4g();
118 
119 	/* Remap basic board registers */
120 	regs = of_find_compatible_node(NULL, NULL, "ge,imp3a-fpga-regs");
121 	if (regs) {
122 		imp3a_regs = of_iomap(regs, 0);
123 		if (imp3a_regs == NULL)
124 			printk(KERN_WARNING "Unable to map board registers\n");
125 		of_node_put(regs);
126 	}
127 
128 #if defined(CONFIG_MMIO_NVRAM)
129 	mmio_nvram_init();
130 #endif
131 
132 	printk(KERN_INFO "GE Intelligent Platforms IMP3A 3U cPCI SBC\n");
133 }
134 
135 /* Return the PCB revision */
136 static unsigned int ge_imp3a_get_pcb_rev(void)
137 {
138 	unsigned int reg;
139 
140 	reg = ioread16(imp3a_regs);
141 	return (reg >> 8) & 0xff;
142 }
143 
144 /* Return the board (software) revision */
145 static unsigned int ge_imp3a_get_board_rev(void)
146 {
147 	unsigned int reg;
148 
149 	reg = ioread16(imp3a_regs + 0x2);
150 	return reg & 0xff;
151 }
152 
153 /* Return the FPGA revision */
154 static unsigned int ge_imp3a_get_fpga_rev(void)
155 {
156 	unsigned int reg;
157 
158 	reg = ioread16(imp3a_regs + 0x2);
159 	return (reg >> 8) & 0xff;
160 }
161 
162 /* Return compactPCI Geographical Address */
163 static unsigned int ge_imp3a_get_cpci_geo_addr(void)
164 {
165 	unsigned int reg;
166 
167 	reg = ioread16(imp3a_regs + 0x6);
168 	return (reg & 0x0f00) >> 8;
169 }
170 
171 /* Return compactPCI System Controller Status */
172 static unsigned int ge_imp3a_get_cpci_is_syscon(void)
173 {
174 	unsigned int reg;
175 
176 	reg = ioread16(imp3a_regs + 0x6);
177 	return reg & (1 << 12);
178 }
179 
180 static void ge_imp3a_show_cpuinfo(struct seq_file *m)
181 {
182 	seq_printf(m, "Vendor\t\t: GE Intelligent Platforms\n");
183 
184 	seq_printf(m, "Revision\t: %u%c\n", ge_imp3a_get_pcb_rev(),
185 		('A' + ge_imp3a_get_board_rev() - 1));
186 
187 	seq_printf(m, "FPGA Revision\t: %u\n", ge_imp3a_get_fpga_rev());
188 
189 	seq_printf(m, "cPCI geo. addr\t: %u\n", ge_imp3a_get_cpci_geo_addr());
190 
191 	seq_printf(m, "cPCI syscon\t: %s\n",
192 		ge_imp3a_get_cpci_is_syscon() ? "yes" : "no");
193 }
194 
195 /*
196  * Called very early, device-tree isn't unflattened
197  */
198 static int __init ge_imp3a_probe(void)
199 {
200 	return of_machine_is_compatible("ge,IMP3A");
201 }
202 
203 machine_arch_initcall(ge_imp3a, mpc85xx_common_publish_devices);
204 
205 machine_arch_initcall(ge_imp3a, swiotlb_setup_bus_notifier);
206 
207 define_machine(ge_imp3a) {
208 	.name			= "GE_IMP3A",
209 	.probe			= ge_imp3a_probe,
210 	.setup_arch		= ge_imp3a_setup_arch,
211 	.init_IRQ		= ge_imp3a_pic_init,
212 	.show_cpuinfo		= ge_imp3a_show_cpuinfo,
213 #ifdef CONFIG_PCI
214 	.pcibios_fixup_bus	= fsl_pcibios_fixup_bus,
215 	.pcibios_fixup_phb      = fsl_pcibios_fixup_phb,
216 #endif
217 	.get_irq		= mpic_get_irq,
218 	.calibrate_decr		= generic_calibrate_decr,
219 	.progress		= udbg_progress,
220 };
221