1/*
2 * mpc7448_hpc2.c
3 *
4 * Board setup routines for the Freescale mpc7448hpc2(taiga) platform
5 *
6 * Author: Jacob Pan
7 *	 jacob.pan@freescale.com
8 * Author: Xianghua Xiao
9 *       x.xiao@freescale.com
10 * Maintainer: Roy Zang <tie-fei.zang@freescale.com>
11 * 	Add Flat Device Tree support fot mpc7448hpc2 board
12 *
13 * Copyright 2004-2006 Freescale Semiconductor, Inc.
14 *
15 * This program is free software; you can redistribute it and/or
16 * modify it under the terms of the GNU General Public License
17 * as published by the Free Software Foundation; either version
18 * 2 of the License, or (at your option) any later version.
19 */
20
21#include <linux/stddef.h>
22#include <linux/kernel.h>
23#include <linux/pci.h>
24#include <linux/kdev_t.h>
25#include <linux/console.h>
26#include <linux/module.h>
27#include <linux/delay.h>
28#include <linux/irq.h>
29#include <linux/seq_file.h>
30#include <linux/root_dev.h>
31#include <linux/serial.h>
32#include <linux/tty.h>
33#include <linux/serial_core.h>
34
35#include <asm/time.h>
36#include <asm/machdep.h>
37#include <asm/prom.h>
38#include <asm/udbg.h>
39#include <asm/tsi108.h>
40#include <asm/pci-bridge.h>
41#include <asm/reg.h>
42#include <mm/mmu_decl.h>
43#include <asm/tsi108_pci.h>
44#include <asm/tsi108_irq.h>
45#include <asm/mpic.h>
46
47#undef DEBUG
48#ifdef DEBUG
49#define DBG(fmt...) do { printk(fmt); } while(0)
50#else
51#define DBG(fmt...) do { } while(0)
52#endif
53
54#define MPC7448HPC2_PCI_CFG_PHYS 0xfb000000
55
56int mpc7448_hpc2_exclude_device(struct pci_controller *hose,
57				u_char bus, u_char devfn)
58{
59	if (bus == 0 && PCI_SLOT(devfn) == 0)
60		return PCIBIOS_DEVICE_NOT_FOUND;
61	else
62		return PCIBIOS_SUCCESSFUL;
63}
64
65static void __init mpc7448_hpc2_setup_arch(void)
66{
67	struct device_node *np;
68	if (ppc_md.progress)
69		ppc_md.progress("mpc7448_hpc2_setup_arch():set_bridge", 0);
70
71	tsi108_csr_vir_base = get_vir_csrbase();
72
73	/* setup PCI host bridge */
74#ifdef CONFIG_PCI
75	for_each_compatible_node(np, "pci", "tsi108-pci")
76		tsi108_setup_pci(np, MPC7448HPC2_PCI_CFG_PHYS, 0);
77
78	ppc_md.pci_exclude_device = mpc7448_hpc2_exclude_device;
79	if (ppc_md.progress)
80		ppc_md.progress("tsi108: resources set", 0x100);
81#endif
82
83	printk(KERN_INFO "MPC7448HPC2 (TAIGA) Platform\n");
84	printk(KERN_INFO
85	       "Jointly ported by Freescale and Tundra Semiconductor\n");
86	printk(KERN_INFO
87	       "Enabling L2 cache then enabling the HID0 prefetch engine.\n");
88}
89
90/*
91 * Interrupt setup and service.  Interrupts on the mpc7448_hpc2 come
92 * from the four external INT pins, PCI interrupts are routed via
93 * PCI interrupt control registers, it generates internal IRQ23
94 *
95 * Interrupt routing on the Taiga Board:
96 * TSI108:PB_INT[0] -> CPU0:INT#
97 * TSI108:PB_INT[1] -> CPU0:MCP#
98 * TSI108:PB_INT[2] -> N/C
99 * TSI108:PB_INT[3] -> N/C
100 */
101static void __init mpc7448_hpc2_init_IRQ(void)
102{
103	struct mpic *mpic;
104#ifdef CONFIG_PCI
105	unsigned int cascade_pci_irq;
106	struct device_node *tsi_pci;
107	struct device_node *cascade_node = NULL;
108#endif
109
110	mpic = mpic_alloc(NULL, 0, MPIC_BIG_ENDIAN |
111			MPIC_SPV_EOI | MPIC_NO_PTHROU_DIS | MPIC_REGSET_TSI108,
112			24, 0,
113			"Tsi108_PIC");
114
115	BUG_ON(mpic == NULL);
116
117	mpic_assign_isu(mpic, 0, mpic->paddr + 0x100);
118
119	mpic_init(mpic);
120
121#ifdef CONFIG_PCI
122	tsi_pci = of_find_node_by_type(NULL, "pci");
123	if (tsi_pci == NULL) {
124		printk("%s: No tsi108 pci node found !\n", __func__);
125		return;
126	}
127	cascade_node = of_find_node_by_type(NULL, "pic-router");
128	if (cascade_node == NULL) {
129		printk("%s: No tsi108 pci cascade node found !\n", __func__);
130		return;
131	}
132
133	cascade_pci_irq = irq_of_parse_and_map(tsi_pci, 0);
134	DBG("%s: tsi108 cascade_pci_irq = 0x%x\n", __func__,
135	    (u32) cascade_pci_irq);
136	tsi108_pci_int_init(cascade_node);
137	irq_set_handler_data(cascade_pci_irq, mpic);
138	irq_set_chained_handler(cascade_pci_irq, tsi108_irq_cascade);
139#endif
140	/* Configure MPIC outputs to CPU0 */
141	tsi108_write_reg(TSI108_MPIC_OFFSET + 0x30c, 0);
142}
143
144void mpc7448_hpc2_show_cpuinfo(struct seq_file *m)
145{
146	seq_printf(m, "vendor\t\t: Freescale Semiconductor\n");
147}
148
149void mpc7448_hpc2_restart(char *cmd)
150{
151	local_irq_disable();
152
153	/* Set exception prefix high - to the firmware */
154	_nmask_and_or_msr(0, MSR_IP);
155
156	for (;;) ;		/* Spin until reset happens */
157}
158
159/*
160 * Called very early, device-tree isn't unflattened
161 */
162static int __init mpc7448_hpc2_probe(void)
163{
164	unsigned long root = of_get_flat_dt_root();
165
166	if (!of_flat_dt_is_compatible(root, "mpc74xx"))
167		return 0;
168	return 1;
169}
170
171static int mpc7448_machine_check_exception(struct pt_regs *regs)
172{
173	const struct exception_table_entry *entry;
174
175	/* Are we prepared to handle this fault */
176	if ((entry = search_exception_tables(regs->nip)) != NULL) {
177		tsi108_clear_pci_cfg_error();
178		regs->msr |= MSR_RI;
179		regs->nip = entry->fixup;
180		return 1;
181	}
182	return 0;
183}
184
185define_machine(mpc7448_hpc2){
186	.name 			= "MPC7448 HPC2",
187	.probe 			= mpc7448_hpc2_probe,
188	.setup_arch 		= mpc7448_hpc2_setup_arch,
189	.init_IRQ 		= mpc7448_hpc2_init_IRQ,
190	.show_cpuinfo 		= mpc7448_hpc2_show_cpuinfo,
191	.get_irq 		= mpic_get_irq,
192	.restart 		= mpc7448_hpc2_restart,
193	.calibrate_decr 	= generic_calibrate_decr,
194	.machine_check_exception= mpc7448_machine_check_exception,
195	.progress 		= udbg_progress,
196};
197