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1 | /* | |
2 | * | |
3 | * Copyright (c) 1999-2000 Grant Erickson <grant@lcse.umn.edu> | |
4 | * | |
5 | * Copyright 2000-2001 MontaVista Software Inc. | |
6 | * Completed implementation. | |
7 | * Author: MontaVista Software, Inc. <source@mvista.com> | |
8 | * Frank Rowand <frank_rowand@mvista.com> | |
9 | * Debbie Chu <debbie_chu@mvista.com> | |
10 | * Further modifications by Armin Kuster | |
11 | * | |
12 | * Module name: ppc4xx_setup.c | |
13 | * | |
14 | */ | |
15 | ||
16 | #include <linux/init.h> | |
17 | #include <linux/smp.h> | |
18 | #include <linux/threads.h> | |
19 | #include <linux/spinlock.h> | |
20 | #include <linux/reboot.h> | |
21 | #include <linux/param.h> | |
22 | #include <linux/string.h> | |
23 | #include <linux/initrd.h> | |
24 | #include <linux/pci.h> | |
25 | #include <linux/rtc.h> | |
26 | #include <linux/console.h> | |
27 | #include <linux/serial_reg.h> | |
28 | #include <linux/seq_file.h> | |
29 | ||
30 | #include <asm/system.h> | |
31 | #include <asm/processor.h> | |
32 | #include <asm/machdep.h> | |
33 | #include <asm/page.h> | |
34 | #include <asm/kgdb.h> | |
35 | #include <asm/ibm4xx.h> | |
36 | #include <asm/time.h> | |
37 | #include <asm/todc.h> | |
38 | #include <asm/ppc4xx_pic.h> | |
39 | #include <asm/pci-bridge.h> | |
40 | #include <asm/bootinfo.h> | |
41 | ||
42 | #include <syslib/gen550.h> | |
43 | ||
44 | /* Function Prototypes */ | |
45 | extern void abort(void); | |
46 | extern void ppc4xx_find_bridges(void); | |
47 | ||
48 | /* Global Variables */ | |
49 | bd_t __res; | |
50 | ||
51 | void __init | |
52 | ppc4xx_setup_arch(void) | |
53 | { | |
54 | #if !defined(CONFIG_BDI_SWITCH) | |
55 | /* | |
56 | * The Abatron BDI JTAG debugger does not tolerate others | |
57 | * mucking with the debug registers. | |
58 | */ | |
59 | mtspr(SPRN_DBCR0, (DBCR0_IDM)); | |
60 | mtspr(SPRN_DBSR, 0xffffffff); | |
61 | #endif | |
62 | ||
63 | /* Setup PCI host bridges */ | |
64 | #ifdef CONFIG_PCI | |
65 | ppc4xx_find_bridges(); | |
66 | #endif | |
67 | } | |
68 | ||
69 | /* | |
70 | * This routine pretty-prints the platform's internal CPU clock | |
71 | * frequencies into the buffer for usage in /proc/cpuinfo. | |
72 | */ | |
73 | ||
74 | static int | |
75 | ppc4xx_show_percpuinfo(struct seq_file *m, int i) | |
76 | { | |
77 | seq_printf(m, "clock\t\t: %ldMHz\n", (long)__res.bi_intfreq / 1000000); | |
78 | ||
79 | return 0; | |
80 | } | |
81 | ||
82 | /* | |
83 | * This routine pretty-prints the platform's internal bus clock | |
84 | * frequencies into the buffer for usage in /proc/cpuinfo. | |
85 | */ | |
86 | static int | |
87 | ppc4xx_show_cpuinfo(struct seq_file *m) | |
88 | { | |
89 | bd_t *bip = &__res; | |
90 | ||
91 | seq_printf(m, "machine\t\t: %s\n", PPC4xx_MACHINE_NAME); | |
92 | seq_printf(m, "plb bus clock\t: %ldMHz\n", | |
93 | (long) bip->bi_busfreq / 1000000); | |
94 | #ifdef CONFIG_PCI | |
95 | seq_printf(m, "pci bus clock\t: %dMHz\n", | |
96 | bip->bi_pci_busfreq / 1000000); | |
97 | #endif | |
98 | ||
99 | return 0; | |
100 | } | |
101 | ||
102 | /* | |
103 | * Return the virtual address representing the top of physical RAM. | |
104 | */ | |
105 | static unsigned long __init | |
106 | ppc4xx_find_end_of_memory(void) | |
107 | { | |
108 | return ((unsigned long) __res.bi_memsize); | |
109 | } | |
110 | ||
111 | void __init | |
112 | ppc4xx_map_io(void) | |
113 | { | |
114 | io_block_mapping(PPC4xx_ONB_IO_VADDR, | |
115 | PPC4xx_ONB_IO_PADDR, PPC4xx_ONB_IO_SIZE, _PAGE_IO); | |
116 | #ifdef CONFIG_PCI | |
117 | io_block_mapping(PPC4xx_PCI_IO_VADDR, | |
118 | PPC4xx_PCI_IO_PADDR, PPC4xx_PCI_IO_SIZE, _PAGE_IO); | |
119 | io_block_mapping(PPC4xx_PCI_CFG_VADDR, | |
120 | PPC4xx_PCI_CFG_PADDR, PPC4xx_PCI_CFG_SIZE, _PAGE_IO); | |
121 | io_block_mapping(PPC4xx_PCI_LCFG_VADDR, | |
122 | PPC4xx_PCI_LCFG_PADDR, PPC4xx_PCI_LCFG_SIZE, _PAGE_IO); | |
123 | #endif | |
124 | } | |
125 | ||
126 | void __init | |
127 | ppc4xx_init_IRQ(void) | |
128 | { | |
129 | ppc4xx_pic_init(); | |
130 | } | |
131 | ||
132 | static void | |
133 | ppc4xx_restart(char *cmd) | |
134 | { | |
135 | printk("%s\n", cmd); | |
136 | abort(); | |
137 | } | |
138 | ||
139 | static void | |
140 | ppc4xx_power_off(void) | |
141 | { | |
142 | printk("System Halted\n"); | |
143 | local_irq_disable(); | |
144 | while (1) ; | |
145 | } | |
146 | ||
147 | static void | |
148 | ppc4xx_halt(void) | |
149 | { | |
150 | printk("System Halted\n"); | |
151 | local_irq_disable(); | |
152 | while (1) ; | |
153 | } | |
154 | ||
155 | /* | |
156 | * This routine retrieves the internal processor frequency from the board | |
157 | * information structure, sets up the kernel timer decrementer based on | |
158 | * that value, enables the 4xx programmable interval timer (PIT) and sets | |
159 | * it up for auto-reload. | |
160 | */ | |
161 | static void __init | |
162 | ppc4xx_calibrate_decr(void) | |
163 | { | |
164 | unsigned int freq; | |
165 | bd_t *bip = &__res; | |
166 | ||
167 | #if defined(CONFIG_WALNUT) || defined(CONFIG_SYCAMORE) | |
168 | /* Walnut boot rom sets DCR CHCR1 (aka CPC0_CR1) bit CETE to 1 */ | |
169 | mtdcr(DCRN_CHCR1, mfdcr(DCRN_CHCR1) & ~CHR1_CETE); | |
170 | #endif | |
171 | freq = bip->bi_tbfreq; | |
172 | tb_ticks_per_jiffy = freq / HZ; | |
173 | tb_to_us = mulhwu_scale_factor(freq, 1000000); | |
174 | ||
175 | /* Set the time base to zero. | |
176 | ** At 200 Mhz, time base will rollover in ~2925 years. | |
177 | */ | |
178 | ||
179 | mtspr(SPRN_TBWL, 0); | |
180 | mtspr(SPRN_TBWU, 0); | |
181 | ||
182 | /* Clear any pending timer interrupts */ | |
183 | ||
184 | mtspr(SPRN_TSR, TSR_ENW | TSR_WIS | TSR_PIS | TSR_FIS); | |
185 | mtspr(SPRN_TCR, TCR_PIE | TCR_ARE); | |
186 | ||
187 | /* Set the PIT reload value and just let it run. */ | |
188 | mtspr(SPRN_PIT, tb_ticks_per_jiffy); | |
189 | } | |
190 | ||
191 | TODC_ALLOC(); | |
192 | ||
193 | /* | |
194 | * Input(s): | |
195 | * r3 - Optional pointer to a board information structure. | |
196 | * r4 - Optional pointer to the physical starting address of the init RAM | |
197 | * disk. | |
198 | * r5 - Optional pointer to the physical ending address of the init RAM | |
199 | * disk. | |
200 | * r6 - Optional pointer to the physical starting address of any kernel | |
201 | * command-line parameters. | |
202 | * r7 - Optional pointer to the physical ending address of any kernel | |
203 | * command-line parameters. | |
204 | */ | |
205 | void __init | |
206 | ppc4xx_init(unsigned long r3, unsigned long r4, unsigned long r5, | |
207 | unsigned long r6, unsigned long r7) | |
208 | { | |
209 | parse_bootinfo(find_bootinfo()); | |
210 | ||
211 | /* | |
212 | * If we were passed in a board information, copy it into the | |
213 | * residual data area. | |
214 | */ | |
215 | if (r3) | |
216 | __res = *(bd_t *)(r3 + KERNELBASE); | |
217 | ||
218 | #if defined(CONFIG_BLK_DEV_INITRD) | |
219 | /* | |
220 | * If the init RAM disk has been configured in, and there's a valid | |
221 | * starting address for it, set it up. | |
222 | */ | |
223 | if (r4) { | |
224 | initrd_start = r4 + KERNELBASE; | |
225 | initrd_end = r5 + KERNELBASE; | |
226 | } | |
227 | #endif /* CONFIG_BLK_DEV_INITRD */ | |
228 | ||
229 | /* Copy the kernel command line arguments to a safe place. */ | |
230 | ||
231 | if (r6) { | |
232 | *(char *) (r7 + KERNELBASE) = 0; | |
233 | strcpy(cmd_line, (char *) (r6 + KERNELBASE)); | |
234 | } | |
235 | ||
236 | /* Initialize machine-dependent vectors */ | |
237 | ||
238 | ppc_md.setup_arch = ppc4xx_setup_arch; | |
239 | ppc_md.show_percpuinfo = ppc4xx_show_percpuinfo; | |
240 | ppc_md.show_cpuinfo = ppc4xx_show_cpuinfo; | |
241 | ppc_md.init_IRQ = ppc4xx_init_IRQ; | |
242 | ||
243 | ppc_md.restart = ppc4xx_restart; | |
244 | ppc_md.power_off = ppc4xx_power_off; | |
245 | ppc_md.halt = ppc4xx_halt; | |
246 | ||
247 | ppc_md.calibrate_decr = ppc4xx_calibrate_decr; | |
248 | ||
249 | ppc_md.find_end_of_memory = ppc4xx_find_end_of_memory; | |
250 | ppc_md.setup_io_mappings = ppc4xx_map_io; | |
251 | ||
252 | #ifdef CONFIG_SERIAL_TEXT_DEBUG | |
253 | ppc_md.progress = gen550_progress; | |
254 | #endif | |
255 | } | |
256 | ||
257 | /* Called from machine_check_exception */ | |
258 | void platform_machine_check(struct pt_regs *regs) | |
259 | { | |
260 | #if defined(DCRN_PLB0_BEAR) | |
261 | printk("PLB0: BEAR= 0x%08x ACR= 0x%08x BESR= 0x%08x\n", | |
262 | mfdcr(DCRN_PLB0_BEAR), mfdcr(DCRN_PLB0_ACR), | |
263 | mfdcr(DCRN_PLB0_BESR)); | |
264 | #endif | |
265 | #if defined(DCRN_POB0_BEAR) | |
266 | printk("PLB0 to OPB: BEAR= 0x%08x BESR0= 0x%08x BESR1= 0x%08x\n", | |
267 | mfdcr(DCRN_POB0_BEAR), mfdcr(DCRN_POB0_BESR0), | |
268 | mfdcr(DCRN_POB0_BESR1)); | |
269 | #endif | |
270 | ||
271 | } |