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_fdt.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 */
39static 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 */
77static 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
84static 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}
98DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_NEC, PCI_DEVICE_ID_NEC_USB,
99	mvme7100_usb_host_fixup);
100
101machine_arch_initcall(mvme7100, mpc86xx_common_publish_devices);
102
103define_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	.progress		= udbg_progress,
111#ifdef CONFIG_PCI
112	.pcibios_fixup_bus	= fsl_pcibios_fixup_bus,
113#endif
114};
115