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 #include <linux/of_irq.h>
31
32 #include <asm/time.h>
33 #include <asm/machdep.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
mpc7448_hpc2_exclude_device(struct pci_controller * hose,u_char bus,u_char devfn)52 int 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
mpc7448_hpc2_setup_pci(void)61 static void __init mpc7448_hpc2_setup_pci(void)
62 {
63 #ifdef CONFIG_PCI
64 struct device_node *np;
65 if (ppc_md.progress)
66 ppc_md.progress("mpc7448_hpc2_setup_pci():set_bridge", 0);
67
68 /* setup PCI host bridge */
69 for_each_compatible_node(np, "pci", "tsi108-pci")
70 tsi108_setup_pci(np, MPC7448HPC2_PCI_CFG_PHYS, 0);
71
72 ppc_md.pci_exclude_device = mpc7448_hpc2_exclude_device;
73 if (ppc_md.progress)
74 ppc_md.progress("tsi108: resources set", 0x100);
75 #endif
76 }
77
mpc7448_hpc2_setup_arch(void)78 static void __init mpc7448_hpc2_setup_arch(void)
79 {
80 tsi108_csr_vir_base = get_vir_csrbase();
81
82 printk(KERN_INFO "MPC7448HPC2 (TAIGA) Platform\n");
83 printk(KERN_INFO
84 "Jointly ported by Freescale and Tundra Semiconductor\n");
85 printk(KERN_INFO
86 "Enabling L2 cache then enabling the HID0 prefetch engine.\n");
87 }
88
89 /*
90 * Interrupt setup and service. Interrupts on the mpc7448_hpc2 come
91 * from the four external INT pins, PCI interrupts are routed via
92 * PCI interrupt control registers, it generates internal IRQ23
93 *
94 * Interrupt routing on the Taiga Board:
95 * TSI108:PB_INT[0] -> CPU0:INT#
96 * TSI108:PB_INT[1] -> CPU0:MCP#
97 * TSI108:PB_INT[2] -> N/C
98 * TSI108:PB_INT[3] -> N/C
99 */
mpc7448_hpc2_init_IRQ(void)100 static void __init mpc7448_hpc2_init_IRQ(void)
101 {
102 struct mpic *mpic;
103 #ifdef CONFIG_PCI
104 unsigned int cascade_pci_irq;
105 struct device_node *tsi_pci;
106 struct device_node *cascade_node = NULL;
107 #endif
108
109 mpic = mpic_alloc(NULL, 0, MPIC_BIG_ENDIAN |
110 MPIC_SPV_EOI | MPIC_NO_PTHROU_DIS | MPIC_REGSET_TSI108,
111 24, 0,
112 "Tsi108_PIC");
113
114 BUG_ON(mpic == NULL);
115
116 mpic_assign_isu(mpic, 0, mpic->paddr + 0x100);
117
118 mpic_init(mpic);
119
120 #ifdef CONFIG_PCI
121 tsi_pci = of_find_node_by_type(NULL, "pci");
122 if (tsi_pci == NULL) {
123 printk("%s: No tsi108 pci node found !\n", __func__);
124 return;
125 }
126 cascade_node = of_find_node_by_type(NULL, "pic-router");
127 if (cascade_node == NULL) {
128 printk("%s: No tsi108 pci cascade node found !\n", __func__);
129 return;
130 }
131
132 cascade_pci_irq = irq_of_parse_and_map(tsi_pci, 0);
133 DBG("%s: tsi108 cascade_pci_irq = 0x%x\n", __func__,
134 (u32) cascade_pci_irq);
135 tsi108_pci_int_init(cascade_node);
136 irq_set_handler_data(cascade_pci_irq, mpic);
137 irq_set_chained_handler(cascade_pci_irq, tsi108_irq_cascade);
138
139 of_node_put(tsi_pci);
140 of_node_put(cascade_node);
141 #endif
142 /* Configure MPIC outputs to CPU0 */
143 tsi108_write_reg(TSI108_MPIC_OFFSET + 0x30c, 0);
144 }
145
mpc7448_hpc2_show_cpuinfo(struct seq_file * m)146 void mpc7448_hpc2_show_cpuinfo(struct seq_file *m)
147 {
148 seq_printf(m, "vendor\t\t: Freescale Semiconductor\n");
149 }
150
mpc7448_hpc2_restart(char * cmd)151 static void __noreturn mpc7448_hpc2_restart(char *cmd)
152 {
153 local_irq_disable();
154
155 /* Set exception prefix high - to the firmware */
156 mtmsr(mfmsr() | MSR_IP);
157 isync();
158
159 for (;;) ; /* Spin until reset happens */
160 }
161
162 /*
163 * Called very early, device-tree isn't unflattened
164 */
mpc7448_hpc2_probe(void)165 static int __init mpc7448_hpc2_probe(void)
166 {
167 if (!of_machine_is_compatible("mpc74xx"))
168 return 0;
169 return 1;
170 }
171
mpc7448_machine_check_exception(struct pt_regs * regs)172 static int mpc7448_machine_check_exception(struct pt_regs *regs)
173 {
174 const struct exception_table_entry *entry;
175
176 /* Are we prepared to handle this fault */
177 if ((entry = search_exception_tables(regs->nip)) != NULL) {
178 tsi108_clear_pci_cfg_error();
179 regs_set_recoverable(regs);
180 regs_set_return_ip(regs, extable_fixup(entry));
181 return 1;
182 }
183 return 0;
184 }
185
define_machine(mpc7448_hpc2)186 define_machine(mpc7448_hpc2){
187 .name = "MPC7448 HPC2",
188 .probe = mpc7448_hpc2_probe,
189 .setup_arch = mpc7448_hpc2_setup_arch,
190 .discover_phbs = mpc7448_hpc2_setup_pci,
191 .init_IRQ = mpc7448_hpc2_init_IRQ,
192 .show_cpuinfo = mpc7448_hpc2_show_cpuinfo,
193 .get_irq = mpic_get_irq,
194 .restart = mpc7448_hpc2_restart,
195 .calibrate_decr = generic_calibrate_decr,
196 .machine_check_exception= mpc7448_machine_check_exception,
197 .progress = udbg_progress,
198 };
199
