1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /*
3  * Board setup routines for the Emerson/Artesyn MVME7100
4  *
5  * Copyright 2016 Elettra-Sincrotrone Trieste S.C.p.A.
6  *
7  * Author: Alessio Igor Bogani <alessio.bogani@elettra.eu>
8  *
9  * Based on earlier code by:
10  *
11  *	Ajit Prem <ajit.prem@emerson.com>
12  *	Copyright 2008 Emerson
13  *
14  * USB host fixup is borrowed by:
15  *
16  *	Martyn Welch <martyn.welch@ge.com>
17  *	Copyright 2008 GE Intelligent Platforms Embedded Systems, Inc.
18  */
19 
20 #include <linux/pci.h>
21 #include <linux/of.h>
22 #include <linux/of_platform.h>
23 #include <linux/of_address.h>
24 #include <asm/udbg.h>
25 #include <asm/mpic.h>
26 #include <sysdev/fsl_soc.h>
27 #include <sysdev/fsl_pci.h>
28 
29 #include "mpc86xx.h"
30 
31 #define MVME7100_INTERRUPT_REG_2_OFFSET	0x05
32 #define MVME7100_DS1375_MASK		0x40
33 #define MVME7100_MAX6649_MASK		0x20
34 #define MVME7100_ABORT_MASK		0x10
35 
36 /*
37  * Setup the architecture
38  */
39 static void __init mvme7100_setup_arch(void)
40 {
41 	struct device_node *bcsr_node;
42 	void __iomem *mvme7100_regs = NULL;
43 	u8 reg;
44 
45 	if (ppc_md.progress)
46 		ppc_md.progress("mvme7100_setup_arch()", 0);
47 
48 #ifdef CONFIG_SMP
49 	mpc86xx_smp_init();
50 #endif
51 
52 	fsl_pci_assign_primary();
53 
54 	/* Remap BCSR registers */
55 	bcsr_node = of_find_compatible_node(NULL, NULL,
56 			"artesyn,mvme7100-bcsr");
57 	if (bcsr_node) {
58 		mvme7100_regs = of_iomap(bcsr_node, 0);
59 		of_node_put(bcsr_node);
60 	}
61 
62 	if (mvme7100_regs) {
63 		/* Disable ds1375, max6649, and abort interrupts */
64 		reg = readb(mvme7100_regs + MVME7100_INTERRUPT_REG_2_OFFSET);
65 		reg |= MVME7100_DS1375_MASK | MVME7100_MAX6649_MASK
66 			| MVME7100_ABORT_MASK;
67 		writeb(reg, mvme7100_regs + MVME7100_INTERRUPT_REG_2_OFFSET);
68 	} else
69 		pr_warn("Unable to map board registers\n");
70 
71 	pr_info("MVME7100 board from Artesyn\n");
72 }
73 
74 /*
75  * Called very early, device-tree isn't unflattened
76  */
77 static int __init mvme7100_probe(void)
78 {
79 	unsigned long root = of_get_flat_dt_root();
80 
81 	return of_flat_dt_is_compatible(root, "artesyn,MVME7100");
82 }
83 
84 static void mvme7100_usb_host_fixup(struct pci_dev *pdev)
85 {
86 	unsigned int val;
87 
88 	if (!machine_is(mvme7100))
89 		return;
90 
91 	/* Ensure only ports 1 & 2 are enabled */
92 	pci_read_config_dword(pdev, 0xe0, &val);
93 	pci_write_config_dword(pdev, 0xe0, (val & ~7) | 0x2);
94 
95 	/* System clock is 48-MHz Oscillator and EHCI Enabled. */
96 	pci_write_config_dword(pdev, 0xe4, 1 << 5);
97 }
98 DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_NEC, PCI_DEVICE_ID_NEC_USB,
99 	mvme7100_usb_host_fixup);
100 
101 machine_arch_initcall(mvme7100, mpc86xx_common_publish_devices);
102 
103 define_machine(mvme7100) {
104 	.name			= "MVME7100",
105 	.probe			= mvme7100_probe,
106 	.setup_arch		= mvme7100_setup_arch,
107 	.init_IRQ		= mpc86xx_init_irq,
108 	.get_irq		= mpic_get_irq,
109 	.time_init		= mpc86xx_time_init,
110 	.calibrate_decr		= generic_calibrate_decr,
111 	.progress		= udbg_progress,
112 #ifdef CONFIG_PCI
113 	.pcibios_fixup_bus	= fsl_pcibios_fixup_bus,
114 #endif
115 };
116