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/system.h>
36 #include <asm/time.h>
37 #include <asm/machdep.h>
38 #include <asm/prom.h>
39 #include <asm/udbg.h>
40 #include <asm/tsi108.h>
41 #include <asm/pci-bridge.h>
42 #include <asm/reg.h>
43 #include <mm/mmu_decl.h>
44 #include <asm/tsi108_pci.h>
45 #include <asm/tsi108_irq.h>
46 #include <asm/mpic.h>
47
48 #undef DEBUG
49 #ifdef DEBUG
50 #define DBG(fmt...) do { printk(fmt); } while(0)
51 #else
52 #define DBG(fmt...) do { } while(0)
53 #endif
54
55 #define MPC7448HPC2_PCI_CFG_PHYS 0xfb000000
56
mpc7448_hpc2_exclude_device(struct pci_controller * hose,u_char bus,u_char devfn)57 int mpc7448_hpc2_exclude_device(struct pci_controller *hose,
58 u_char bus, u_char devfn)
59 {
60 if (bus == 0 && PCI_SLOT(devfn) == 0)
61 return PCIBIOS_DEVICE_NOT_FOUND;
62 else
63 return PCIBIOS_SUCCESSFUL;
64 }
65
mpc7448_hpc2_setup_arch(void)66 static void __init mpc7448_hpc2_setup_arch(void)
67 {
68 struct device_node *np;
69 if (ppc_md.progress)
70 ppc_md.progress("mpc7448_hpc2_setup_arch():set_bridge", 0);
71
72 tsi108_csr_vir_base = get_vir_csrbase();
73
74 /* setup PCI host bridge */
75 #ifdef CONFIG_PCI
76 for_each_compatible_node(np, "pci", "tsi108-pci")
77 tsi108_setup_pci(np, MPC7448HPC2_PCI_CFG_PHYS, 0);
78
79 ppc_md.pci_exclude_device = mpc7448_hpc2_exclude_device;
80 if (ppc_md.progress)
81 ppc_md.progress("tsi108: resources set", 0x100);
82 #endif
83
84 printk(KERN_INFO "MPC7448HPC2 (TAIGA) Platform\n");
85 printk(KERN_INFO
86 "Jointly ported by Freescale and Tundra Semiconductor\n");
87 printk(KERN_INFO
88 "Enabling L2 cache then enabling the HID0 prefetch engine.\n");
89 }
90
91 /*
92 * Interrupt setup and service. Interrupts on the mpc7448_hpc2 come
93 * from the four external INT pins, PCI interrupts are routed via
94 * PCI interrupt control registers, it generates internal IRQ23
95 *
96 * Interrupt routing on the Taiga Board:
97 * TSI108:PB_INT[0] -> CPU0:INT#
98 * TSI108:PB_INT[1] -> CPU0:MCP#
99 * TSI108:PB_INT[2] -> N/C
100 * TSI108:PB_INT[3] -> N/C
101 */
mpc7448_hpc2_init_IRQ(void)102 static void __init mpc7448_hpc2_init_IRQ(void)
103 {
104 struct mpic *mpic;
105 #ifdef CONFIG_PCI
106 unsigned int cascade_pci_irq;
107 struct device_node *tsi_pci;
108 struct device_node *cascade_node = NULL;
109 #endif
110
111 mpic = mpic_alloc(NULL, 0,
112 MPIC_BIG_ENDIAN | MPIC_WANTS_RESET |
113 MPIC_SPV_EOI | MPIC_NO_PTHROU_DIS | MPIC_REGSET_TSI108,
114 24,
115 NR_IRQS-4, /* num_sources used */
116 "Tsi108_PIC");
117
118 BUG_ON(mpic == NULL);
119
120 mpic_assign_isu(mpic, 0, mpic->paddr + 0x100);
121
122 mpic_init(mpic);
123
124 #ifdef CONFIG_PCI
125 tsi_pci = of_find_node_by_type(NULL, "pci");
126 if (tsi_pci == NULL) {
127 printk("%s: No tsi108 pci node found !\n", __func__);
128 return;
129 }
130 cascade_node = of_find_node_by_type(NULL, "pic-router");
131 if (cascade_node == NULL) {
132 printk("%s: No tsi108 pci cascade node found !\n", __func__);
133 return;
134 }
135
136 cascade_pci_irq = irq_of_parse_and_map(tsi_pci, 0);
137 DBG("%s: tsi108 cascade_pci_irq = 0x%x\n", __func__,
138 (u32) cascade_pci_irq);
139 tsi108_pci_int_init(cascade_node);
140 irq_set_handler_data(cascade_pci_irq, mpic);
141 irq_set_chained_handler(cascade_pci_irq, tsi108_irq_cascade);
142 #endif
143 /* Configure MPIC outputs to CPU0 */
144 tsi108_write_reg(TSI108_MPIC_OFFSET + 0x30c, 0);
145 }
146
mpc7448_hpc2_show_cpuinfo(struct seq_file * m)147 void mpc7448_hpc2_show_cpuinfo(struct seq_file *m)
148 {
149 seq_printf(m, "vendor\t\t: Freescale Semiconductor\n");
150 }
151
mpc7448_hpc2_restart(char * cmd)152 void mpc7448_hpc2_restart(char *cmd)
153 {
154 local_irq_disable();
155
156 /* Set exception prefix high - to the firmware */
157 _nmask_and_or_msr(0, MSR_IP);
158
159 for (;;) ; /* Spin until reset happens */
160 }
161
mpc7448_hpc2_power_off(void)162 void mpc7448_hpc2_power_off(void)
163 {
164 local_irq_disable();
165 for (;;) ; /* No way to shut power off with software */
166 }
167
mpc7448_hpc2_halt(void)168 void mpc7448_hpc2_halt(void)
169 {
170 mpc7448_hpc2_power_off();
171 }
172
173 /*
174 * Called very early, device-tree isn't unflattened
175 */
mpc7448_hpc2_probe(void)176 static int __init mpc7448_hpc2_probe(void)
177 {
178 unsigned long root = of_get_flat_dt_root();
179
180 if (!of_flat_dt_is_compatible(root, "mpc74xx"))
181 return 0;
182 return 1;
183 }
184
mpc7448_machine_check_exception(struct pt_regs * regs)185 static int mpc7448_machine_check_exception(struct pt_regs *regs)
186 {
187 const struct exception_table_entry *entry;
188
189 /* Are we prepared to handle this fault */
190 if ((entry = search_exception_tables(regs->nip)) != NULL) {
191 tsi108_clear_pci_cfg_error();
192 regs->msr |= MSR_RI;
193 regs->nip = entry->fixup;
194 return 1;
195 }
196 return 0;
197 }
198
define_machine(mpc7448_hpc2)199 define_machine(mpc7448_hpc2){
200 .name = "MPC7448 HPC2",
201 .probe = mpc7448_hpc2_probe,
202 .setup_arch = mpc7448_hpc2_setup_arch,
203 .init_IRQ = mpc7448_hpc2_init_IRQ,
204 .show_cpuinfo = mpc7448_hpc2_show_cpuinfo,
205 .get_irq = mpic_get_irq,
206 .restart = mpc7448_hpc2_restart,
207 .calibrate_decr = generic_calibrate_decr,
208 .machine_check_exception= mpc7448_machine_check_exception,
209 .progress = udbg_progress,
210 };
211