1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /*
3  * GE PPC9A board support
4  *
5  * Author: Martyn Welch <martyn.welch@ge.com>
6  *
7  * Copyright 2008 GE Intelligent Platforms Embedded Systems, Inc.
8  *
9  * Based on: mpc86xx_hpcn.c (MPC86xx HPCN board specific routines)
10  * Copyright 2006 Freescale Semiconductor Inc.
11  *
12  * NEC fixup adapted from arch/mips/pci/fixup-lm2e.c
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/of_address.h>
22 #include <linux/of_platform.h>
23 
24 #include <asm/time.h>
25 #include <asm/machdep.h>
26 #include <asm/pci-bridge.h>
27 #include <mm/mmu_decl.h>
28 #include <asm/udbg.h>
29 
30 #include <asm/mpic.h>
31 #include <asm/nvram.h>
32 
33 #include <sysdev/fsl_pci.h>
34 #include <sysdev/fsl_soc.h>
35 #include <sysdev/ge/ge_pic.h>
36 
37 #include "mpc86xx.h"
38 
39 #undef DEBUG
40 
41 #ifdef DEBUG
42 #define DBG (fmt...) do { printk(KERN_ERR "PPC9A: " fmt); } while (0)
43 #else
44 #define DBG (fmt...) do { } while (0)
45 #endif
46 
47 void __iomem *ppc9a_regs;
48 
49 static void __init gef_ppc9a_init_irq(void)
50 {
51 	struct device_node *cascade_node = NULL;
52 
53 	mpc86xx_init_irq();
54 
55 	/*
56 	 * There is a simple interrupt handler in the main FPGA, this needs
57 	 * to be cascaded into the MPIC
58 	 */
59 	cascade_node = of_find_compatible_node(NULL, NULL, "gef,fpga-pic-1.00");
60 	if (!cascade_node) {
61 		printk(KERN_WARNING "PPC9A: No FPGA PIC\n");
62 		return;
63 	}
64 
65 	gef_pic_init(cascade_node);
66 	of_node_put(cascade_node);
67 }
68 
69 static void __init gef_ppc9a_setup_arch(void)
70 {
71 	struct device_node *regs;
72 
73 	printk(KERN_INFO "GE Intelligent Platforms PPC9A 6U VME SBC\n");
74 
75 #ifdef CONFIG_SMP
76 	mpc86xx_smp_init();
77 #endif
78 
79 	fsl_pci_assign_primary();
80 
81 	/* Remap basic board registers */
82 	regs = of_find_compatible_node(NULL, NULL, "gef,ppc9a-fpga-regs");
83 	if (regs) {
84 		ppc9a_regs = of_iomap(regs, 0);
85 		if (ppc9a_regs == NULL)
86 			printk(KERN_WARNING "Unable to map board registers\n");
87 		of_node_put(regs);
88 	}
89 
90 #if defined(CONFIG_MMIO_NVRAM)
91 	mmio_nvram_init();
92 #endif
93 }
94 
95 /* Return the PCB revision */
96 static unsigned int gef_ppc9a_get_pcb_rev(void)
97 {
98 	unsigned int reg;
99 
100 	reg = ioread32be(ppc9a_regs);
101 	return (reg >> 16) & 0xff;
102 }
103 
104 /* Return the board (software) revision */
105 static unsigned int gef_ppc9a_get_board_rev(void)
106 {
107 	unsigned int reg;
108 
109 	reg = ioread32be(ppc9a_regs);
110 	return (reg >> 8) & 0xff;
111 }
112 
113 /* Return the FPGA revision */
114 static unsigned int gef_ppc9a_get_fpga_rev(void)
115 {
116 	unsigned int reg;
117 
118 	reg = ioread32be(ppc9a_regs);
119 	return reg & 0xf;
120 }
121 
122 /* Return VME Geographical Address */
123 static unsigned int gef_ppc9a_get_vme_geo_addr(void)
124 {
125 	unsigned int reg;
126 
127 	reg = ioread32be(ppc9a_regs + 0x4);
128 	return reg & 0x1f;
129 }
130 
131 /* Return VME System Controller Status */
132 static unsigned int gef_ppc9a_get_vme_is_syscon(void)
133 {
134 	unsigned int reg;
135 
136 	reg = ioread32be(ppc9a_regs + 0x4);
137 	return (reg >> 9) & 0x1;
138 }
139 
140 static void gef_ppc9a_show_cpuinfo(struct seq_file *m)
141 {
142 	uint svid = mfspr(SPRN_SVR);
143 
144 	seq_printf(m, "Vendor\t\t: GE Intelligent Platforms\n");
145 
146 	seq_printf(m, "Revision\t: %u%c\n", gef_ppc9a_get_pcb_rev(),
147 		('A' + gef_ppc9a_get_board_rev()));
148 	seq_printf(m, "FPGA Revision\t: %u\n", gef_ppc9a_get_fpga_rev());
149 
150 	seq_printf(m, "SVR\t\t: 0x%x\n", svid);
151 
152 	seq_printf(m, "VME geo. addr\t: %u\n", gef_ppc9a_get_vme_geo_addr());
153 
154 	seq_printf(m, "VME syscon\t: %s\n",
155 		gef_ppc9a_get_vme_is_syscon() ? "yes" : "no");
156 }
157 
158 static void gef_ppc9a_nec_fixup(struct pci_dev *pdev)
159 {
160 	unsigned int val;
161 
162 	/* Do not do the fixup on other platforms! */
163 	if (!machine_is(gef_ppc9a))
164 		return;
165 
166 	printk(KERN_INFO "Running NEC uPD720101 Fixup\n");
167 
168 	/* Ensure ports 1, 2, 3, 4 & 5 are enabled */
169 	pci_read_config_dword(pdev, 0xe0, &val);
170 	pci_write_config_dword(pdev, 0xe0, (val & ~7) | 0x5);
171 
172 	/* System clock is 48-MHz Oscillator and EHCI Enabled. */
173 	pci_write_config_dword(pdev, 0xe4, 1 << 5);
174 }
175 DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_NEC, PCI_DEVICE_ID_NEC_USB,
176 	gef_ppc9a_nec_fixup);
177 
178 /*
179  * Called very early, device-tree isn't unflattened
180  *
181  * This function is called to determine whether the BSP is compatible with the
182  * supplied device-tree, which is assumed to be the correct one for the actual
183  * board. It is expected that, in the future, a kernel may support multiple
184  * boards.
185  */
186 static int __init gef_ppc9a_probe(void)
187 {
188 	if (of_machine_is_compatible("gef,ppc9a"))
189 		return 1;
190 
191 	return 0;
192 }
193 
194 machine_arch_initcall(gef_ppc9a, mpc86xx_common_publish_devices);
195 
196 define_machine(gef_ppc9a) {
197 	.name			= "GE PPC9A",
198 	.probe			= gef_ppc9a_probe,
199 	.setup_arch		= gef_ppc9a_setup_arch,
200 	.init_IRQ		= gef_ppc9a_init_irq,
201 	.show_cpuinfo		= gef_ppc9a_show_cpuinfo,
202 	.get_irq		= mpic_get_irq,
203 	.time_init		= mpc86xx_time_init,
204 	.calibrate_decr		= generic_calibrate_decr,
205 	.progress		= udbg_progress,
206 #ifdef CONFIG_PCI
207 	.pcibios_fixup_bus	= fsl_pcibios_fixup_bus,
208 #endif
209 };
210