mvme7100.c

  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};