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_platform.h>
24 #include <linux/of_address.h>
25 #include <asm/udbg.h>
26 #include <asm/mpic.h>
27 #include <sysdev/fsl_soc.h>
28 #include <sysdev/fsl_pci.h>
29 
30 #include "mpc86xx.h"
31 
32 #define MVME7100_INTERRUPT_REG_2_OFFSET	0x05
33 #define MVME7100_DS1375_MASK		0x40
34 #define MVME7100_MAX6649_MASK		0x20
35 #define MVME7100_ABORT_MASK		0x10
36 
37 /*
38  * Setup the architecture
39  */
40 static void __init mvme7100_setup_arch(void)
41 {
42 	struct device_node *bcsr_node;
43 	void __iomem *mvme7100_regs = NULL;
44 	u8 reg;
45 
46 	if (ppc_md.progress)
47 		ppc_md.progress("mvme7100_setup_arch()", 0);
48 
49 #ifdef CONFIG_SMP
50 	mpc86xx_smp_init();
51 #endif
52 
53 	fsl_pci_assign_primary();
54 
55 	/* Remap BCSR registers */
56 	bcsr_node = of_find_compatible_node(NULL, NULL,
57 			"artesyn,mvme7100-bcsr");
58 	if (bcsr_node) {
59 		mvme7100_regs = of_iomap(bcsr_node, 0);
60 		of_node_put(bcsr_node);
61 	}
62 
63 	if (mvme7100_regs) {
64 		/* Disable ds1375, max6649, and abort interrupts */
65 		reg = readb(mvme7100_regs + MVME7100_INTERRUPT_REG_2_OFFSET);
66 		reg |= MVME7100_DS1375_MASK | MVME7100_MAX6649_MASK
67 			| MVME7100_ABORT_MASK;
68 		writeb(reg, mvme7100_regs + MVME7100_INTERRUPT_REG_2_OFFSET);
69 	} else
70 		pr_warn("Unable to map board registers\n");
71 
72 	pr_info("MVME7100 board from Artesyn\n");
73 }
74 
75 /*
76  * Called very early, device-tree isn't unflattened
77  */
78 static int __init mvme7100_probe(void)
79 {
80 	unsigned long root = of_get_flat_dt_root();
81 
82 	return of_flat_dt_is_compatible(root, "artesyn,MVME7100");
83 }
84 
85 static void mvme7100_usb_host_fixup(struct pci_dev *pdev)
86 {
87 	unsigned int val;
88 
89 	if (!machine_is(mvme7100))
90 		return;
91 
92 	/* Ensure only ports 1 & 2 are enabled */
93 	pci_read_config_dword(pdev, 0xe0, &val);
94 	pci_write_config_dword(pdev, 0xe0, (val & ~7) | 0x2);
95 
96 	/* System clock is 48-MHz Oscillator and EHCI Enabled. */
97 	pci_write_config_dword(pdev, 0xe4, 1 << 5);
98 }
99 DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_NEC, PCI_DEVICE_ID_NEC_USB,
100 	mvme7100_usb_host_fixup);
101 
102 machine_arch_initcall(mvme7100, mpc86xx_common_publish_devices);
103 
104 define_machine(mvme7100) {
105 	.name			= "MVME7100",
106 	.probe			= mvme7100_probe,
107 	.setup_arch		= mvme7100_setup_arch,
108 	.init_IRQ		= mpc86xx_init_irq,
109 	.get_irq		= mpic_get_irq,
110 	.time_init		= mpc86xx_time_init,
111 	.calibrate_decr		= generic_calibrate_decr,
112 	.progress		= udbg_progress,
113 #ifdef CONFIG_PCI
114 	.pcibios_fixup_bus	= fsl_pcibios_fixup_bus,
115 #endif
116 };
117