1 /*
2  * Board setup routines for the Emerson/Artesyn MVME7100
3  *
4  * Copyright 2016 Elettra-Sincrotrone Trieste S.C.p.A.
5  *
6  * Author: Alessio Igor Bogani <alessio.bogani@elettra.eu>
7  *
8  * Based on earlier code by:
9  *
10  *	Ajit Prem <ajit.prem@emerson.com>
11  *	Copyright 2008 Emerson
12  *
13  * USB host fixup is borrowed by:
14  *
15  *	Martyn Welch <martyn.welch@ge.com>
16  *	Copyright 2008 GE Intelligent Platforms Embedded Systems, Inc.
17  *
18  * This program is free software; you can redistribute  it and/or modify it
19  * under  the terms of  the GNU General  Public License as published by the
20  * Free Software Foundation;  either version 2 of the  License, or (at your
21  * option) any later version.
22  *
23  */
24 
25 #include <linux/pci.h>
26 #include <linux/of.h>
27 #include <linux/of_platform.h>
28 #include <linux/of_address.h>
29 #include <asm/udbg.h>
30 #include <asm/mpic.h>
31 #include <sysdev/fsl_soc.h>
32 #include <sysdev/fsl_pci.h>
33 
34 #include "mpc86xx.h"
35 
36 #define MVME7100_INTERRUPT_REG_2_OFFSET	0x05
37 #define MVME7100_DS1375_MASK		0x40
38 #define MVME7100_MAX6649_MASK		0x20
39 #define MVME7100_ABORT_MASK		0x10
40 
41 /*
42  * Setup the architecture
43  */
44 static void __init mvme7100_setup_arch(void)
45 {
46 	struct device_node *bcsr_node;
47 	void __iomem *mvme7100_regs = NULL;
48 	u8 reg;
49 
50 	if (ppc_md.progress)
51 		ppc_md.progress("mvme7100_setup_arch()", 0);
52 
53 #ifdef CONFIG_SMP
54 	mpc86xx_smp_init();
55 #endif
56 
57 	fsl_pci_assign_primary();
58 
59 	/* Remap BCSR registers */
60 	bcsr_node = of_find_compatible_node(NULL, NULL,
61 			"artesyn,mvme7100-bcsr");
62 	if (bcsr_node) {
63 		mvme7100_regs = of_iomap(bcsr_node, 0);
64 		of_node_put(bcsr_node);
65 	}
66 
67 	if (mvme7100_regs) {
68 		/* Disable ds1375, max6649, and abort interrupts */
69 		reg = readb(mvme7100_regs + MVME7100_INTERRUPT_REG_2_OFFSET);
70 		reg |= MVME7100_DS1375_MASK | MVME7100_MAX6649_MASK
71 			| MVME7100_ABORT_MASK;
72 		writeb(reg, mvme7100_regs + MVME7100_INTERRUPT_REG_2_OFFSET);
73 	} else
74 		pr_warn("Unable to map board registers\n");
75 
76 	pr_info("MVME7100 board from Artesyn\n");
77 }
78 
79 /*
80  * Called very early, device-tree isn't unflattened
81  */
82 static int __init mvme7100_probe(void)
83 {
84 	unsigned long root = of_get_flat_dt_root();
85 
86 	return of_flat_dt_is_compatible(root, "artesyn,MVME7100");
87 }
88 
89 static void mvme7100_usb_host_fixup(struct pci_dev *pdev)
90 {
91 	unsigned int val;
92 
93 	if (!machine_is(mvme7100))
94 		return;
95 
96 	/* Ensure only ports 1 & 2 are enabled */
97 	pci_read_config_dword(pdev, 0xe0, &val);
98 	pci_write_config_dword(pdev, 0xe0, (val & ~7) | 0x2);
99 
100 	/* System clock is 48-MHz Oscillator and EHCI Enabled. */
101 	pci_write_config_dword(pdev, 0xe4, 1 << 5);
102 }
103 DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_NEC, PCI_DEVICE_ID_NEC_USB,
104 	mvme7100_usb_host_fixup);
105 
106 machine_arch_initcall(mvme7100, mpc86xx_common_publish_devices);
107 
108 define_machine(mvme7100) {
109 	.name			= "MVME7100",
110 	.probe			= mvme7100_probe,
111 	.setup_arch		= mvme7100_setup_arch,
112 	.init_IRQ		= mpc86xx_init_irq,
113 	.get_irq		= mpic_get_irq,
114 	.time_init		= mpc86xx_time_init,
115 	.calibrate_decr		= generic_calibrate_decr,
116 	.progress		= udbg_progress,
117 #ifdef CONFIG_PCI
118 	.pcibios_fixup_bus	= fsl_pcibios_fixup_bus,
119 #endif
120 };
121