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1da177e4 LT |
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/config.h> | |
17 | #include <linux/init.h> | |
18 | #include <linux/smp.h> | |
19 | #include <linux/threads.h> | |
20 | #include <linux/spinlock.h> | |
21 | #include <linux/irq.h> | |
22 | #include <linux/reboot.h> | |
23 | #include <linux/param.h> | |
24 | #include <linux/string.h> | |
25 | #include <linux/initrd.h> | |
26 | #include <linux/pci.h> | |
27 | #include <linux/rtc.h> | |
28 | #include <linux/console.h> | |
29 | #include <linux/ide.h> | |
30 | #include <linux/serial_reg.h> | |
31 | #include <linux/seq_file.h> | |
32 | ||
33 | #include <asm/system.h> | |
34 | #include <asm/processor.h> | |
35 | #include <asm/machdep.h> | |
36 | #include <asm/page.h> | |
37 | #include <asm/kgdb.h> | |
38 | #include <asm/ibm4xx.h> | |
39 | #include <asm/time.h> | |
40 | #include <asm/todc.h> | |
41 | #include <asm/ppc4xx_pic.h> | |
42 | #include <asm/pci-bridge.h> | |
43 | #include <asm/bootinfo.h> | |
44 | ||
45 | #include <syslib/gen550.h> | |
46 | ||
47 | /* Function Prototypes */ | |
48 | extern void abort(void); | |
49 | extern void ppc4xx_find_bridges(void); | |
50 | ||
1da177e4 LT |
51 | /* Global Variables */ |
52 | bd_t __res; | |
53 | ||
54 | void __init | |
55 | ppc4xx_setup_arch(void) | |
56 | { | |
57 | #if !defined(CONFIG_BDI_SWITCH) | |
58 | /* | |
59 | * The Abatron BDI JTAG debugger does not tolerate others | |
60 | * mucking with the debug registers. | |
61 | */ | |
62 | mtspr(SPRN_DBCR0, (DBCR0_IDM)); | |
63 | mtspr(SPRN_DBSR, 0xffffffff); | |
64 | #endif | |
65 | ||
66 | /* Setup PCI host bridges */ | |
67 | #ifdef CONFIG_PCI | |
68 | ppc4xx_find_bridges(); | |
69 | #endif | |
70 | } | |
71 | ||
72 | /* | |
73 | * This routine pretty-prints the platform's internal CPU clock | |
74 | * frequencies into the buffer for usage in /proc/cpuinfo. | |
75 | */ | |
76 | ||
77 | static int | |
78 | ppc4xx_show_percpuinfo(struct seq_file *m, int i) | |
79 | { | |
80 | seq_printf(m, "clock\t\t: %ldMHz\n", (long)__res.bi_intfreq / 1000000); | |
81 | ||
82 | return 0; | |
83 | } | |
84 | ||
85 | /* | |
86 | * This routine pretty-prints the platform's internal bus clock | |
87 | * frequencies into the buffer for usage in /proc/cpuinfo. | |
88 | */ | |
89 | static int | |
90 | ppc4xx_show_cpuinfo(struct seq_file *m) | |
91 | { | |
92 | bd_t *bip = &__res; | |
93 | ||
94 | seq_printf(m, "machine\t\t: %s\n", PPC4xx_MACHINE_NAME); | |
95 | seq_printf(m, "plb bus clock\t: %ldMHz\n", | |
96 | (long) bip->bi_busfreq / 1000000); | |
97 | #ifdef CONFIG_PCI | |
98 | seq_printf(m, "pci bus clock\t: %dMHz\n", | |
99 | bip->bi_pci_busfreq / 1000000); | |
100 | #endif | |
101 | ||
102 | return 0; | |
103 | } | |
104 | ||
105 | /* | |
106 | * Return the virtual address representing the top of physical RAM. | |
107 | */ | |
108 | static unsigned long __init | |
109 | ppc4xx_find_end_of_memory(void) | |
110 | { | |
111 | return ((unsigned long) __res.bi_memsize); | |
112 | } | |
113 | ||
114 | void __init | |
115 | ppc4xx_map_io(void) | |
116 | { | |
117 | io_block_mapping(PPC4xx_ONB_IO_VADDR, | |
118 | PPC4xx_ONB_IO_PADDR, PPC4xx_ONB_IO_SIZE, _PAGE_IO); | |
119 | #ifdef CONFIG_PCI | |
120 | io_block_mapping(PPC4xx_PCI_IO_VADDR, | |
121 | PPC4xx_PCI_IO_PADDR, PPC4xx_PCI_IO_SIZE, _PAGE_IO); | |
122 | io_block_mapping(PPC4xx_PCI_CFG_VADDR, | |
123 | PPC4xx_PCI_CFG_PADDR, PPC4xx_PCI_CFG_SIZE, _PAGE_IO); | |
124 | io_block_mapping(PPC4xx_PCI_LCFG_VADDR, | |
125 | PPC4xx_PCI_LCFG_PADDR, PPC4xx_PCI_LCFG_SIZE, _PAGE_IO); | |
126 | #endif | |
127 | } | |
128 | ||
129 | void __init | |
130 | ppc4xx_init_IRQ(void) | |
131 | { | |
132 | ppc4xx_pic_init(); | |
133 | } | |
134 | ||
135 | static void | |
136 | ppc4xx_restart(char *cmd) | |
137 | { | |
138 | printk("%s\n", cmd); | |
139 | abort(); | |
140 | } | |
141 | ||
142 | static void | |
143 | ppc4xx_power_off(void) | |
144 | { | |
145 | printk("System Halted\n"); | |
146 | local_irq_disable(); | |
147 | while (1) ; | |
148 | } | |
149 | ||
150 | static void | |
151 | ppc4xx_halt(void) | |
152 | { | |
153 | printk("System Halted\n"); | |
154 | local_irq_disable(); | |
155 | while (1) ; | |
156 | } | |
157 | ||
158 | /* | |
159 | * This routine retrieves the internal processor frequency from the board | |
160 | * information structure, sets up the kernel timer decrementer based on | |
161 | * that value, enables the 4xx programmable interval timer (PIT) and sets | |
162 | * it up for auto-reload. | |
163 | */ | |
164 | static void __init | |
165 | ppc4xx_calibrate_decr(void) | |
166 | { | |
167 | unsigned int freq; | |
168 | bd_t *bip = &__res; | |
169 | ||
f4f1269c | 170 | #if defined(CONFIG_WALNUT) || defined(CONFIG_SYCAMORE) |
1da177e4 LT |
171 | /* Walnut boot rom sets DCR CHCR1 (aka CPC0_CR1) bit CETE to 1 */ |
172 | mtdcr(DCRN_CHCR1, mfdcr(DCRN_CHCR1) & ~CHR1_CETE); | |
173 | #endif | |
174 | freq = bip->bi_tbfreq; | |
175 | tb_ticks_per_jiffy = freq / HZ; | |
176 | tb_to_us = mulhwu_scale_factor(freq, 1000000); | |
177 | ||
178 | /* Set the time base to zero. | |
179 | ** At 200 Mhz, time base will rollover in ~2925 years. | |
180 | */ | |
181 | ||
182 | mtspr(SPRN_TBWL, 0); | |
183 | mtspr(SPRN_TBWU, 0); | |
184 | ||
185 | /* Clear any pending timer interrupts */ | |
186 | ||
187 | mtspr(SPRN_TSR, TSR_ENW | TSR_WIS | TSR_PIS | TSR_FIS); | |
188 | mtspr(SPRN_TCR, TCR_PIE | TCR_ARE); | |
189 | ||
190 | /* Set the PIT reload value and just let it run. */ | |
191 | mtspr(SPRN_PIT, tb_ticks_per_jiffy); | |
192 | } | |
193 | ||
194 | /* | |
195 | * IDE stuff. | |
196 | * should be generic for every IDE PCI chipset | |
197 | */ | |
198 | #if defined(CONFIG_PCI) && defined(CONFIG_IDE) | |
199 | static void | |
200 | ppc4xx_ide_init_hwif_ports(hw_regs_t * hw, unsigned long data_port, | |
201 | unsigned long ctrl_port, int *irq) | |
202 | { | |
203 | int i; | |
204 | ||
205 | for (i = IDE_DATA_OFFSET; i <= IDE_STATUS_OFFSET; ++i) | |
206 | hw->io_ports[i] = data_port + i - IDE_DATA_OFFSET; | |
207 | ||
208 | hw->io_ports[IDE_CONTROL_OFFSET] = ctrl_port; | |
209 | } | |
210 | #endif /* defined(CONFIG_PCI) && defined(CONFIG_IDE) */ | |
211 | ||
212 | TODC_ALLOC(); | |
213 | ||
214 | /* | |
215 | * Input(s): | |
216 | * r3 - Optional pointer to a board information structure. | |
217 | * r4 - Optional pointer to the physical starting address of the init RAM | |
218 | * disk. | |
219 | * r5 - Optional pointer to the physical ending address of the init RAM | |
220 | * disk. | |
221 | * r6 - Optional pointer to the physical starting address of any kernel | |
222 | * command-line parameters. | |
223 | * r7 - Optional pointer to the physical ending address of any kernel | |
224 | * command-line parameters. | |
225 | */ | |
226 | void __init | |
227 | ppc4xx_init(unsigned long r3, unsigned long r4, unsigned long r5, | |
228 | unsigned long r6, unsigned long r7) | |
229 | { | |
230 | parse_bootinfo(find_bootinfo()); | |
231 | ||
232 | /* | |
233 | * If we were passed in a board information, copy it into the | |
234 | * residual data area. | |
235 | */ | |
236 | if (r3) | |
237 | __res = *(bd_t *)(r3 + KERNELBASE); | |
238 | ||
239 | #if defined(CONFIG_BLK_DEV_INITRD) | |
240 | /* | |
241 | * If the init RAM disk has been configured in, and there's a valid | |
242 | * starting address for it, set it up. | |
243 | */ | |
244 | if (r4) { | |
245 | initrd_start = r4 + KERNELBASE; | |
246 | initrd_end = r5 + KERNELBASE; | |
247 | } | |
248 | #endif /* CONFIG_BLK_DEV_INITRD */ | |
249 | ||
250 | /* Copy the kernel command line arguments to a safe place. */ | |
251 | ||
252 | if (r6) { | |
253 | *(char *) (r7 + KERNELBASE) = 0; | |
254 | strcpy(cmd_line, (char *) (r6 + KERNELBASE)); | |
255 | } | |
1da177e4 LT |
256 | |
257 | /* Initialize machine-dependent vectors */ | |
258 | ||
259 | ppc_md.setup_arch = ppc4xx_setup_arch; | |
260 | ppc_md.show_percpuinfo = ppc4xx_show_percpuinfo; | |
261 | ppc_md.show_cpuinfo = ppc4xx_show_cpuinfo; | |
262 | ppc_md.init_IRQ = ppc4xx_init_IRQ; | |
263 | ||
264 | ppc_md.restart = ppc4xx_restart; | |
265 | ppc_md.power_off = ppc4xx_power_off; | |
266 | ppc_md.halt = ppc4xx_halt; | |
267 | ||
268 | ppc_md.calibrate_decr = ppc4xx_calibrate_decr; | |
269 | ||
1da177e4 LT |
270 | ppc_md.find_end_of_memory = ppc4xx_find_end_of_memory; |
271 | ppc_md.setup_io_mappings = ppc4xx_map_io; | |
272 | ||
273 | #ifdef CONFIG_SERIAL_TEXT_DEBUG | |
274 | ppc_md.progress = gen550_progress; | |
275 | #endif | |
276 | ||
277 | #if defined(CONFIG_PCI) && defined(CONFIG_IDE) | |
278 | ppc_ide_md.ide_init_hwif = ppc4xx_ide_init_hwif_ports; | |
279 | #endif /* defined(CONFIG_PCI) && defined(CONFIG_IDE) */ | |
280 | } | |
281 | ||
282 | /* Called from MachineCheckException */ | |
283 | void platform_machine_check(struct pt_regs *regs) | |
284 | { | |
285 | #if defined(DCRN_PLB0_BEAR) | |
286 | printk("PLB0: BEAR= 0x%08x ACR= 0x%08x BESR= 0x%08x\n", | |
287 | mfdcr(DCRN_PLB0_BEAR), mfdcr(DCRN_PLB0_ACR), | |
288 | mfdcr(DCRN_PLB0_BESR)); | |
289 | #endif | |
290 | #if defined(DCRN_POB0_BEAR) | |
291 | printk("PLB0 to OPB: BEAR= 0x%08x BESR0= 0x%08x BESR1= 0x%08x\n", | |
292 | mfdcr(DCRN_POB0_BEAR), mfdcr(DCRN_POB0_BESR0), | |
293 | mfdcr(DCRN_POB0_BESR1)); | |
294 | #endif | |
295 | ||
296 | } |