1// SPDX-License-Identifier: GPL-2.0-or-later
2/*
3 * mpc7448_hpc2.c
4 *
5 * Board setup routines for the Freescale mpc7448hpc2(taiga) platform
6 *
7 * Author: Jacob Pan
8 *	 jacob.pan@freescale.com
9 * Author: Xianghua Xiao
10 *       x.xiao@freescale.com
11 * Maintainer: Roy Zang <tie-fei.zang@freescale.com>
12 * 	Add Flat Device Tree support fot mpc7448hpc2 board
13 *
14 * Copyright 2004-2006 Freescale Semiconductor, Inc.
15 */
16
17#include <linux/stddef.h>
18#include <linux/kernel.h>
19#include <linux/pci.h>
20#include <linux/kdev_t.h>
21#include <linux/console.h>
22#include <linux/extable.h>
23#include <linux/delay.h>
24#include <linux/irq.h>
25#include <linux/seq_file.h>
26#include <linux/root_dev.h>
27#include <linux/serial.h>
28#include <linux/tty.h>
29#include <linux/serial_core.h>
30
31#include <asm/time.h>
32#include <asm/machdep.h>
33#include <asm/prom.h>
34#include <asm/udbg.h>
35#include <asm/tsi108.h>
36#include <asm/pci-bridge.h>
37#include <asm/reg.h>
38#include <mm/mmu_decl.h>
39#include <asm/tsi108_pci.h>
40#include <asm/tsi108_irq.h>
41#include <asm/mpic.h>
42
43#undef DEBUG
44#ifdef DEBUG
45#define DBG(fmt...) do { printk(fmt); } while(0)
46#else
47#define DBG(fmt...) do { } while(0)
48#endif
49
50#define MPC7448HPC2_PCI_CFG_PHYS 0xfb000000
51
52int mpc7448_hpc2_exclude_device(struct pci_controller *hose,
53				u_char bus, u_char devfn)
54{
55	if (bus == 0 && PCI_SLOT(devfn) == 0)
56		return PCIBIOS_DEVICE_NOT_FOUND;
57	else
58		return PCIBIOS_SUCCESSFUL;
59}
60
61static void __init mpc7448_hpc2_setup_arch(void)
62{
63	struct device_node *np;
64	if (ppc_md.progress)
65		ppc_md.progress("mpc7448_hpc2_setup_arch():set_bridge", 0);
66
67	tsi108_csr_vir_base = get_vir_csrbase();
68
69	/* setup PCI host bridge */
70#ifdef CONFIG_PCI
71	for_each_compatible_node(np, "pci", "tsi108-pci")
72		tsi108_setup_pci(np, MPC7448HPC2_PCI_CFG_PHYS, 0);
73
74	ppc_md.pci_exclude_device = mpc7448_hpc2_exclude_device;
75	if (ppc_md.progress)
76		ppc_md.progress("tsi108: resources set", 0x100);
77#endif
78
79	printk(KERN_INFO "MPC7448HPC2 (TAIGA) Platform\n");
80	printk(KERN_INFO
81	       "Jointly ported by Freescale and Tundra Semiconductor\n");
82	printk(KERN_INFO
83	       "Enabling L2 cache then enabling the HID0 prefetch engine.\n");
84}
85
86/*
87 * Interrupt setup and service.  Interrupts on the mpc7448_hpc2 come
88 * from the four external INT pins, PCI interrupts are routed via
89 * PCI interrupt control registers, it generates internal IRQ23
90 *
91 * Interrupt routing on the Taiga Board:
92 * TSI108:PB_INT[0] -> CPU0:INT#
93 * TSI108:PB_INT[1] -> CPU0:MCP#
94 * TSI108:PB_INT[2] -> N/C
95 * TSI108:PB_INT[3] -> N/C
96 */
97static void __init mpc7448_hpc2_init_IRQ(void)
98{
99	struct mpic *mpic;
100#ifdef CONFIG_PCI
101	unsigned int cascade_pci_irq;
102	struct device_node *tsi_pci;
103	struct device_node *cascade_node = NULL;
104#endif
105
106	mpic = mpic_alloc(NULL, 0, MPIC_BIG_ENDIAN |
107			MPIC_SPV_EOI | MPIC_NO_PTHROU_DIS | MPIC_REGSET_TSI108,
108			24, 0,
109			"Tsi108_PIC");
110
111	BUG_ON(mpic == NULL);
112
113	mpic_assign_isu(mpic, 0, mpic->paddr + 0x100);
114
115	mpic_init(mpic);
116
117#ifdef CONFIG_PCI
118	tsi_pci = of_find_node_by_type(NULL, "pci");
119	if (tsi_pci == NULL) {
120		printk("%s: No tsi108 pci node found !\n", __func__);
121		return;
122	}
123	cascade_node = of_find_node_by_type(NULL, "pic-router");
124	if (cascade_node == NULL) {
125		printk("%s: No tsi108 pci cascade node found !\n", __func__);
126		return;
127	}
128
129	cascade_pci_irq = irq_of_parse_and_map(tsi_pci, 0);
130	DBG("%s: tsi108 cascade_pci_irq = 0x%x\n", __func__,
131	    (u32) cascade_pci_irq);
132	tsi108_pci_int_init(cascade_node);
133	irq_set_handler_data(cascade_pci_irq, mpic);
134	irq_set_chained_handler(cascade_pci_irq, tsi108_irq_cascade);
135#endif
136	/* Configure MPIC outputs to CPU0 */
137	tsi108_write_reg(TSI108_MPIC_OFFSET + 0x30c, 0);
138}
139
140void mpc7448_hpc2_show_cpuinfo(struct seq_file *m)
141{
142	seq_printf(m, "vendor\t\t: Freescale Semiconductor\n");
143}
144
145static void __noreturn mpc7448_hpc2_restart(char *cmd)
146{
147	local_irq_disable();
148
149	/* Set exception prefix high - to the firmware */
150	mtmsr(mfmsr() | MSR_IP);
151	isync();
152
153	for (;;) ;		/* Spin until reset happens */
154}
155
156/*
157 * Called very early, device-tree isn't unflattened
158 */
159static int __init mpc7448_hpc2_probe(void)
160{
161	if (!of_machine_is_compatible("mpc74xx"))
162		return 0;
163	return 1;
164}
165
166static int mpc7448_machine_check_exception(struct pt_regs *regs)
167{
168	const struct exception_table_entry *entry;
169
170	/* Are we prepared to handle this fault */
171	if ((entry = search_exception_tables(regs->nip)) != NULL) {
172		tsi108_clear_pci_cfg_error();
173		regs->msr |= MSR_RI;
174		regs->nip = extable_fixup(entry);
175		return 1;
176	}
177	return 0;
178}
179
180define_machine(mpc7448_hpc2){
181	.name 			= "MPC7448 HPC2",
182	.probe 			= mpc7448_hpc2_probe,
183	.setup_arch 		= mpc7448_hpc2_setup_arch,
184	.init_IRQ 		= mpc7448_hpc2_init_IRQ,
185	.show_cpuinfo 		= mpc7448_hpc2_show_cpuinfo,
186	.get_irq 		= mpic_get_irq,
187	.restart 		= mpc7448_hpc2_restart,
188	.calibrate_decr 	= generic_calibrate_decr,
189	.machine_check_exception= mpc7448_machine_check_exception,
190	.progress 		= udbg_progress,
191};
192