1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /*
3  * GE IMP3A Board Setup
4  *
5  * Author Martyn Welch <martyn.welch@ge.com>
6  *
7  * Copyright 2010 GE Intelligent Platforms Embedded Systems, Inc.
8  *
9  * Based on: mpc85xx_ds.c (MPC85xx DS Board Setup)
10  * Copyright 2007 Freescale Semiconductor Inc.
11  */
12 
13 #include <linux/stddef.h>
14 #include <linux/kernel.h>
15 #include <linux/pci.h>
16 #include <linux/kdev_t.h>
17 #include <linux/delay.h>
18 #include <linux/seq_file.h>
19 #include <linux/interrupt.h>
20 #include <linux/of_address.h>
21 #include <linux/of_platform.h>
22 
23 #include <asm/time.h>
24 #include <asm/machdep.h>
25 #include <asm/pci-bridge.h>
26 #include <mm/mmu_decl.h>
27 #include <asm/udbg.h>
28 #include <asm/mpic.h>
29 #include <asm/swiotlb.h>
30 #include <asm/nvram.h>
31 
32 #include <sysdev/fsl_soc.h>
33 #include <sysdev/fsl_pci.h>
34 #include "smp.h"
35 
36 #include "mpc85xx.h"
37 #include <sysdev/ge/ge_pic.h>
38 
39 void __iomem *imp3a_regs;
40 
41 void __init ge_imp3a_pic_init(void)
42 {
43 	struct mpic *mpic;
44 	struct device_node *np;
45 	struct device_node *cascade_node = NULL;
46 
47 	if (of_machine_is_compatible("fsl,MPC8572DS-CAMP")) {
48 		mpic = mpic_alloc(NULL, 0,
49 			MPIC_NO_RESET |
50 			MPIC_BIG_ENDIAN |
51 			MPIC_SINGLE_DEST_CPU,
52 			0, 256, " OpenPIC  ");
53 	} else {
54 		mpic = mpic_alloc(NULL, 0,
55 			  MPIC_BIG_ENDIAN |
56 			  MPIC_SINGLE_DEST_CPU,
57 			0, 256, " OpenPIC  ");
58 	}
59 
60 	BUG_ON(mpic == NULL);
61 	mpic_init(mpic);
62 	/*
63 	 * There is a simple interrupt handler in the main FPGA, this needs
64 	 * to be cascaded into the MPIC
65 	 */
66 	for_each_node_by_type(np, "interrupt-controller")
67 		if (of_device_is_compatible(np, "gef,fpga-pic-1.00")) {
68 			cascade_node = np;
69 			break;
70 		}
71 
72 	if (cascade_node == NULL) {
73 		printk(KERN_WARNING "IMP3A: No FPGA PIC\n");
74 		return;
75 	}
76 
77 	gef_pic_init(cascade_node);
78 	of_node_put(cascade_node);
79 }
80 
81 static void __init ge_imp3a_pci_assign_primary(void)
82 {
83 #ifdef CONFIG_PCI
84 	struct device_node *np;
85 	struct resource rsrc;
86 
87 	for_each_node_by_type(np, "pci") {
88 		if (of_device_is_compatible(np, "fsl,mpc8540-pci") ||
89 		    of_device_is_compatible(np, "fsl,mpc8548-pcie") ||
90 		    of_device_is_compatible(np, "fsl,p2020-pcie")) {
91 			of_address_to_resource(np, 0, &rsrc);
92 			if ((rsrc.start & 0xfffff) == 0x9000) {
93 				of_node_put(fsl_pci_primary);
94 				fsl_pci_primary = of_node_get(np);
95 			}
96 		}
97 	}
98 #endif
99 }
100 
101 /*
102  * Setup the architecture
103  */
104 static void __init ge_imp3a_setup_arch(void)
105 {
106 	struct device_node *regs;
107 
108 	if (ppc_md.progress)
109 		ppc_md.progress("ge_imp3a_setup_arch()", 0);
110 
111 	mpc85xx_smp_init();
112 
113 	ge_imp3a_pci_assign_primary();
114 
115 	swiotlb_detect_4g();
116 
117 	/* Remap basic board registers */
118 	regs = of_find_compatible_node(NULL, NULL, "ge,imp3a-fpga-regs");
119 	if (regs) {
120 		imp3a_regs = of_iomap(regs, 0);
121 		if (imp3a_regs == NULL)
122 			printk(KERN_WARNING "Unable to map board registers\n");
123 		of_node_put(regs);
124 	}
125 
126 #if defined(CONFIG_MMIO_NVRAM)
127 	mmio_nvram_init();
128 #endif
129 
130 	printk(KERN_INFO "GE Intelligent Platforms IMP3A 3U cPCI SBC\n");
131 }
132 
133 /* Return the PCB revision */
134 static unsigned int ge_imp3a_get_pcb_rev(void)
135 {
136 	unsigned int reg;
137 
138 	reg = ioread16(imp3a_regs);
139 	return (reg >> 8) & 0xff;
140 }
141 
142 /* Return the board (software) revision */
143 static unsigned int ge_imp3a_get_board_rev(void)
144 {
145 	unsigned int reg;
146 
147 	reg = ioread16(imp3a_regs + 0x2);
148 	return reg & 0xff;
149 }
150 
151 /* Return the FPGA revision */
152 static unsigned int ge_imp3a_get_fpga_rev(void)
153 {
154 	unsigned int reg;
155 
156 	reg = ioread16(imp3a_regs + 0x2);
157 	return (reg >> 8) & 0xff;
158 }
159 
160 /* Return compactPCI Geographical Address */
161 static unsigned int ge_imp3a_get_cpci_geo_addr(void)
162 {
163 	unsigned int reg;
164 
165 	reg = ioread16(imp3a_regs + 0x6);
166 	return (reg & 0x0f00) >> 8;
167 }
168 
169 /* Return compactPCI System Controller Status */
170 static unsigned int ge_imp3a_get_cpci_is_syscon(void)
171 {
172 	unsigned int reg;
173 
174 	reg = ioread16(imp3a_regs + 0x6);
175 	return reg & (1 << 12);
176 }
177 
178 static void ge_imp3a_show_cpuinfo(struct seq_file *m)
179 {
180 	seq_printf(m, "Vendor\t\t: GE Intelligent Platforms\n");
181 
182 	seq_printf(m, "Revision\t: %u%c\n", ge_imp3a_get_pcb_rev(),
183 		('A' + ge_imp3a_get_board_rev() - 1));
184 
185 	seq_printf(m, "FPGA Revision\t: %u\n", ge_imp3a_get_fpga_rev());
186 
187 	seq_printf(m, "cPCI geo. addr\t: %u\n", ge_imp3a_get_cpci_geo_addr());
188 
189 	seq_printf(m, "cPCI syscon\t: %s\n",
190 		ge_imp3a_get_cpci_is_syscon() ? "yes" : "no");
191 }
192 
193 /*
194  * Called very early, device-tree isn't unflattened
195  */
196 static int __init ge_imp3a_probe(void)
197 {
198 	return of_machine_is_compatible("ge,IMP3A");
199 }
200 
201 machine_arch_initcall(ge_imp3a, mpc85xx_common_publish_devices);
202 
203 define_machine(ge_imp3a) {
204 	.name			= "GE_IMP3A",
205 	.probe			= ge_imp3a_probe,
206 	.setup_arch		= ge_imp3a_setup_arch,
207 	.init_IRQ		= ge_imp3a_pic_init,
208 	.show_cpuinfo		= ge_imp3a_show_cpuinfo,
209 #ifdef CONFIG_PCI
210 	.pcibios_fixup_bus	= fsl_pcibios_fixup_bus,
211 	.pcibios_fixup_phb      = fsl_pcibios_fixup_phb,
212 #endif
213 	.get_irq		= mpic_get_irq,
214 	.calibrate_decr		= generic_calibrate_decr,
215 	.progress		= udbg_progress,
216 };
217