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/extable.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
56 int 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
65 static 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 */
101 static 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
144 void mpc7448_hpc2_show_cpuinfo(struct seq_file *m)
145 {
146 seq_printf(m, "vendor\t\t: Freescale Semiconductor\n");
147 }
148
149 static void __noreturn 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 */
162 static int __init mpc7448_hpc2_probe(void)
163 {
164 if (!of_machine_is_compatible("mpc74xx"))
165 return 0;
166 return 1;
167 }
168
169 static int mpc7448_machine_check_exception(struct pt_regs *regs)
170 {
171 const struct exception_table_entry *entry;
172
173 /* Are we prepared to handle this fault */
174 if ((entry = search_exception_tables(regs->nip)) != NULL) {
175 tsi108_clear_pci_cfg_error();
176 regs->msr |= MSR_RI;
177 regs->nip = extable_fixup(entry);
178 return 1;
179 }
180 return 0;
181 }
182
183 define_machine(mpc7448_hpc2){
184 .name = "MPC7448 HPC2",
185 .probe = mpc7448_hpc2_probe,
186 .setup_arch = mpc7448_hpc2_setup_arch,
187 .init_IRQ = mpc7448_hpc2_init_IRQ,
188 .show_cpuinfo = mpc7448_hpc2_show_cpuinfo,
189 .get_irq = mpic_get_irq,
190 .restart = mpc7448_hpc2_restart,
191 .calibrate_decr = generic_calibrate_decr,
192 .machine_check_exception= mpc7448_machine_check_exception,
193 .progress = udbg_progress,
194 };
195
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