1 /*
2  *  Maple (970 eval board) setup code
3  *
4  *  (c) Copyright 2004 Benjamin Herrenschmidt (benh@kernel.crashing.org),
5  *                     IBM Corp.
6  *
7  *  This program is free software; you can redistribute it and/or
8  *  modify it under the terms of the GNU General Public License
9  *  as published by the Free Software Foundation; either version
10  *  2 of the License, or (at your option) any later version.
11  *
12  */
13 
14 #undef DEBUG
15 
16 #include <linux/init.h>
17 #include <linux/errno.h>
18 #include <linux/sched.h>
19 #include <linux/kernel.h>
20 #include <linux/mm.h>
21 #include <linux/stddef.h>
22 #include <linux/unistd.h>
23 #include <linux/ptrace.h>
24 #include <linux/slab.h>
25 #include <linux/user.h>
26 #include <linux/a.out.h>
27 #include <linux/tty.h>
28 #include <linux/string.h>
29 #include <linux/delay.h>
30 #include <linux/ioport.h>
31 #include <linux/major.h>
32 #include <linux/initrd.h>
33 #include <linux/vt_kern.h>
34 #include <linux/console.h>
35 #include <linux/pci.h>
36 #include <linux/adb.h>
37 #include <linux/cuda.h>
38 #include <linux/pmu.h>
39 #include <linux/irq.h>
40 #include <linux/seq_file.h>
41 #include <linux/root_dev.h>
42 #include <linux/serial.h>
43 #include <linux/smp.h>
44 #include <linux/bitops.h>
45 #include <linux/of_device.h>
46 #include <linux/lmb.h>
47 
48 #include <asm/processor.h>
49 #include <asm/sections.h>
50 #include <asm/prom.h>
51 #include <asm/system.h>
52 #include <asm/pgtable.h>
53 #include <asm/io.h>
54 #include <asm/kexec.h>
55 #include <asm/pci-bridge.h>
56 #include <asm/iommu.h>
57 #include <asm/machdep.h>
58 #include <asm/dma.h>
59 #include <asm/cputable.h>
60 #include <asm/time.h>
61 #include <asm/mpic.h>
62 #include <asm/rtas.h>
63 #include <asm/udbg.h>
64 #include <asm/nvram.h>
65 
66 #include "maple.h"
67 
68 #ifdef DEBUG
69 #define DBG(fmt...) udbg_printf(fmt)
70 #else
71 #define DBG(fmt...)
72 #endif
73 
74 static unsigned long maple_find_nvram_base(void)
75 {
76 	struct device_node *rtcs;
77 	unsigned long result = 0;
78 
79 	/* find NVRAM device */
80 	rtcs = of_find_compatible_node(NULL, "nvram", "AMD8111");
81 	if (rtcs) {
82 		struct resource r;
83 		if (of_address_to_resource(rtcs, 0, &r)) {
84 			printk(KERN_EMERG "Maple: Unable to translate NVRAM"
85 			       " address\n");
86 			goto bail;
87 		}
88 		if (!(r.flags & IORESOURCE_IO)) {
89 			printk(KERN_EMERG "Maple: NVRAM address isn't PIO!\n");
90 			goto bail;
91 		}
92 		result = r.start;
93 	} else
94 		printk(KERN_EMERG "Maple: Unable to find NVRAM\n");
95  bail:
96 	of_node_put(rtcs);
97 	return result;
98 }
99 
100 static void maple_restart(char *cmd)
101 {
102 	unsigned int maple_nvram_base;
103 	const unsigned int *maple_nvram_offset, *maple_nvram_command;
104 	struct device_node *sp;
105 
106 	maple_nvram_base = maple_find_nvram_base();
107 	if (maple_nvram_base == 0)
108 		goto fail;
109 
110 	/* find service processor device */
111 	sp = of_find_node_by_name(NULL, "service-processor");
112 	if (!sp) {
113 		printk(KERN_EMERG "Maple: Unable to find Service Processor\n");
114 		goto fail;
115 	}
116 	maple_nvram_offset = of_get_property(sp, "restart-addr", NULL);
117 	maple_nvram_command = of_get_property(sp, "restart-value", NULL);
118 	of_node_put(sp);
119 
120 	/* send command */
121 	outb_p(*maple_nvram_command, maple_nvram_base + *maple_nvram_offset);
122 	for (;;) ;
123  fail:
124 	printk(KERN_EMERG "Maple: Manual Restart Required\n");
125 }
126 
127 static void maple_power_off(void)
128 {
129 	unsigned int maple_nvram_base;
130 	const unsigned int *maple_nvram_offset, *maple_nvram_command;
131 	struct device_node *sp;
132 
133 	maple_nvram_base = maple_find_nvram_base();
134 	if (maple_nvram_base == 0)
135 		goto fail;
136 
137 	/* find service processor device */
138 	sp = of_find_node_by_name(NULL, "service-processor");
139 	if (!sp) {
140 		printk(KERN_EMERG "Maple: Unable to find Service Processor\n");
141 		goto fail;
142 	}
143 	maple_nvram_offset = of_get_property(sp, "power-off-addr", NULL);
144 	maple_nvram_command = of_get_property(sp, "power-off-value", NULL);
145 	of_node_put(sp);
146 
147 	/* send command */
148 	outb_p(*maple_nvram_command, maple_nvram_base + *maple_nvram_offset);
149 	for (;;) ;
150  fail:
151 	printk(KERN_EMERG "Maple: Manual Power-Down Required\n");
152 }
153 
154 static void maple_halt(void)
155 {
156 	maple_power_off();
157 }
158 
159 #ifdef CONFIG_SMP
160 struct smp_ops_t maple_smp_ops = {
161 	.probe		= smp_mpic_probe,
162 	.message_pass	= smp_mpic_message_pass,
163 	.kick_cpu	= smp_generic_kick_cpu,
164 	.setup_cpu	= smp_mpic_setup_cpu,
165 	.give_timebase	= smp_generic_give_timebase,
166 	.take_timebase	= smp_generic_take_timebase,
167 };
168 #endif /* CONFIG_SMP */
169 
170 static void __init maple_use_rtas_reboot_and_halt_if_present(void)
171 {
172 	if (rtas_service_present("system-reboot") &&
173 	    rtas_service_present("power-off")) {
174 		ppc_md.restart = rtas_restart;
175 		ppc_md.power_off = rtas_power_off;
176 		ppc_md.halt = rtas_halt;
177 	}
178 }
179 
180 void __init maple_setup_arch(void)
181 {
182 	/* init to some ~sane value until calibrate_delay() runs */
183 	loops_per_jiffy = 50000000;
184 
185 	/* Setup SMP callback */
186 #ifdef CONFIG_SMP
187 	smp_ops = &maple_smp_ops;
188 #endif
189 	/* Lookup PCI hosts */
190        	maple_pci_init();
191 
192 #ifdef CONFIG_DUMMY_CONSOLE
193 	conswitchp = &dummy_con;
194 #endif
195 	maple_use_rtas_reboot_and_halt_if_present();
196 
197 	printk(KERN_DEBUG "Using native/NAP idle loop\n");
198 
199 	mmio_nvram_init();
200 }
201 
202 /*
203  * Early initialization.
204  */
205 static void __init maple_init_early(void)
206 {
207 	DBG(" -> maple_init_early\n");
208 
209 	iommu_init_early_dart();
210 
211 	DBG(" <- maple_init_early\n");
212 }
213 
214 /*
215  * This is almost identical to pSeries and CHRP. We need to make that
216  * code generic at one point, with appropriate bits in the device-tree to
217  * identify the presence of an HT APIC
218  */
219 static void __init maple_init_IRQ(void)
220 {
221 	struct device_node *root, *np, *mpic_node = NULL;
222 	const unsigned int *opprop;
223 	unsigned long openpic_addr = 0;
224 	int naddr, n, i, opplen, has_isus = 0;
225 	struct mpic *mpic;
226 	unsigned int flags = MPIC_PRIMARY;
227 
228 	/* Locate MPIC in the device-tree. Note that there is a bug
229 	 * in Maple device-tree where the type of the controller is
230 	 * open-pic and not interrupt-controller
231 	 */
232 
233 	for_each_node_by_type(np, "interrupt-controller")
234 		if (of_device_is_compatible(np, "open-pic")) {
235 			mpic_node = np;
236 			break;
237 		}
238 	if (mpic_node == NULL)
239 		for_each_node_by_type(np, "open-pic") {
240 			mpic_node = np;
241 			break;
242 		}
243 	if (mpic_node == NULL) {
244 		printk(KERN_ERR
245 		       "Failed to locate the MPIC interrupt controller\n");
246 		return;
247 	}
248 
249 	/* Find address list in /platform-open-pic */
250 	root = of_find_node_by_path("/");
251 	naddr = of_n_addr_cells(root);
252 	opprop = of_get_property(root, "platform-open-pic", &opplen);
253 	if (opprop != 0) {
254 		openpic_addr = of_read_number(opprop, naddr);
255 		has_isus = (opplen > naddr);
256 		printk(KERN_DEBUG "OpenPIC addr: %lx, has ISUs: %d\n",
257 		       openpic_addr, has_isus);
258 	}
259 
260 	BUG_ON(openpic_addr == 0);
261 
262 	/* Check for a big endian MPIC */
263 	if (of_get_property(np, "big-endian", NULL) != NULL)
264 		flags |= MPIC_BIG_ENDIAN;
265 
266 	/* XXX Maple specific bits */
267 	flags |= MPIC_U3_HT_IRQS | MPIC_WANTS_RESET;
268 	/* All U3/U4 are big-endian, older SLOF firmware doesn't encode this */
269 	flags |= MPIC_BIG_ENDIAN;
270 
271 	/* Setup the openpic driver. More device-tree junks, we hard code no
272 	 * ISUs for now. I'll have to revisit some stuffs with the folks doing
273 	 * the firmware for those
274 	 */
275 	mpic = mpic_alloc(mpic_node, openpic_addr, flags,
276 			  /*has_isus ? 16 :*/ 0, 0, " MPIC     ");
277 	BUG_ON(mpic == NULL);
278 
279 	/* Add ISUs */
280 	opplen /= sizeof(u32);
281 	for (n = 0, i = naddr; i < opplen; i += naddr, n++) {
282 		unsigned long isuaddr = of_read_number(opprop + i, naddr);
283 		mpic_assign_isu(mpic, n, isuaddr);
284 	}
285 
286 	/* All ISUs are setup, complete initialization */
287 	mpic_init(mpic);
288 	ppc_md.get_irq = mpic_get_irq;
289 	of_node_put(mpic_node);
290 	of_node_put(root);
291 }
292 
293 static void __init maple_progress(char *s, unsigned short hex)
294 {
295 	printk("*** %04x : %s\n", hex, s ? s : "");
296 }
297 
298 
299 /*
300  * Called very early, MMU is off, device-tree isn't unflattened
301  */
302 static int __init maple_probe(void)
303 {
304 	unsigned long root = of_get_flat_dt_root();
305 
306 	if (!of_flat_dt_is_compatible(root, "Momentum,Maple") &&
307 	    !of_flat_dt_is_compatible(root, "Momentum,Apache"))
308 		return 0;
309 	/*
310 	 * On U3, the DART (iommu) must be allocated now since it
311 	 * has an impact on htab_initialize (due to the large page it
312 	 * occupies having to be broken up so the DART itself is not
313 	 * part of the cacheable linar mapping
314 	 */
315 	alloc_dart_table();
316 
317 	hpte_init_native();
318 
319 	return 1;
320 }
321 
322 define_machine(maple) {
323 	.name			= "Maple",
324 	.probe			= maple_probe,
325 	.setup_arch		= maple_setup_arch,
326 	.init_early		= maple_init_early,
327 	.init_IRQ		= maple_init_IRQ,
328 	.pci_irq_fixup		= maple_pci_irq_fixup,
329 	.pci_get_legacy_ide_irq	= maple_pci_get_legacy_ide_irq,
330 	.restart		= maple_restart,
331 	.power_off		= maple_power_off,
332 	.halt			= maple_halt,
333        	.get_boot_time		= maple_get_boot_time,
334        	.set_rtc_time		= maple_set_rtc_time,
335        	.get_rtc_time		= maple_get_rtc_time,
336       	.calibrate_decr		= generic_calibrate_decr,
337 	.progress		= maple_progress,
338 	.power_save		= power4_idle,
339 #ifdef CONFIG_KEXEC
340 	.machine_kexec		= default_machine_kexec,
341 	.machine_kexec_prepare	= default_machine_kexec_prepare,
342 	.machine_crash_shutdown	= default_machine_crash_shutdown,
343 #endif
344 };
345